extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
ref-cache.o export.o tree-log.o acl.o free-space-cache.o zlib.o \
- compression.o
+ compression.o delayed-ref.o
else
# Normal Makefile
*/
struct list_head delalloc_inodes;
+ /*
+ * list for tracking inodes that must be sent to disk before a
+ * rename or truncate commit
+ */
+ struct list_head ordered_operations;
+
/* the space_info for where this inode's data allocations are done */
struct btrfs_space_info *space_info;
*/
u64 logged_trans;
- /*
- * trans that last made a change that should be fully fsync'd. This
- * gets reset to zero each time the inode is logged
- */
- u64 log_dirty_trans;
-
/* total number of bytes pending delalloc, used by stat to calc the
* real block usage of the file
*/
/* the start of block group preferred for allocations. */
u64 block_group;
+ /* the fsync log has some corner cases that mean we have to check
+ * directories to see if any unlinks have been done before
+ * the directory was logged. See tree-log.c for all the
+ * details
+ */
+ u64 last_unlink_trans;
+
+ /*
+ * ordered_data_close is set by truncate when a file that used
+ * to have good data has been truncated to zero. When it is set
+ * the btrfs file release call will add this inode to the
+ * ordered operations list so that we make sure to flush out any
+ * new data the application may have written before commit.
+ *
+ * yes, its silly to have a single bitflag, but we might grow more
+ * of these.
+ */
+ unsigned ordered_data_close:1;
+
struct inode vfs_inode;
};
* empty_size -- a hint that you plan on doing more cow. This is the size in
* bytes the allocator should try to find free next to the block it returns.
* This is just a hint and may be ignored by the allocator.
- *
- * prealloc_dest -- if you have already reserved a destination for the cow,
- * this uses that block instead of allocating a new one.
- * btrfs_alloc_reserved_extent is used to finish the allocation.
*/
static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,
struct extent_buffer **cow_ret,
- u64 search_start, u64 empty_size,
- u64 prealloc_dest)
+ u64 search_start, u64 empty_size)
{
u64 parent_start;
struct extent_buffer *cow;
level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
- if (prealloc_dest) {
- struct btrfs_key ins;
-
- ins.objectid = prealloc_dest;
- ins.offset = buf->len;
- ins.type = BTRFS_EXTENT_ITEM_KEY;
-
- ret = btrfs_alloc_reserved_extent(trans, root, parent_start,
- root->root_key.objectid,
- trans->transid, level, &ins);
- BUG_ON(ret);
- cow = btrfs_init_new_buffer(trans, root, prealloc_dest,
- buf->len, level);
- } else {
- cow = btrfs_alloc_free_block(trans, root, buf->len,
- parent_start,
- root->root_key.objectid,
- trans->transid, level,
- search_start, empty_size);
- }
+ cow = btrfs_alloc_free_block(trans, root, buf->len,
+ parent_start, root->root_key.objectid,
+ trans->transid, level,
+ search_start, empty_size);
if (IS_ERR(cow))
return PTR_ERR(cow);
noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,
- struct extent_buffer **cow_ret, u64 prealloc_dest)
+ struct extent_buffer **cow_ret)
{
u64 search_start;
int ret;
btrfs_header_owner(buf) == root->root_key.objectid &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
*cow_ret = buf;
- WARN_ON(prealloc_dest);
return 0;
}
btrfs_set_lock_blocking(buf);
ret = __btrfs_cow_block(trans, root, buf, parent,
- parent_slot, cow_ret, search_start, 0,
- prealloc_dest);
+ parent_slot, cow_ret, search_start, 0);
return ret;
}
err = __btrfs_cow_block(trans, root, cur, parent, i,
&cur, search_start,
min(16 * blocksize,
- (end_slot - i) * blocksize), 0);
+ (end_slot - i) * blocksize));
if (err) {
btrfs_tree_unlock(cur);
free_extent_buffer(cur);
BUG_ON(!child);
btrfs_tree_lock(child);
btrfs_set_lock_blocking(child);
- ret = btrfs_cow_block(trans, root, child, mid, 0, &child, 0);
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
BUG_ON(ret);
spin_lock(&root->node_lock);
spin_unlock(&root->node_lock);
ret = btrfs_update_extent_ref(trans, root, child->start,
+ child->len,
mid->start, child->start,
root->root_key.objectid,
trans->transid, level - 1);
BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
return 0;
+ if (trans->transaction->delayed_refs.flushing &&
+ btrfs_header_nritems(mid) > 2)
+ return 0;
+
if (btrfs_header_nritems(mid) < 2)
err_on_enospc = 1;
btrfs_tree_lock(left);
btrfs_set_lock_blocking(left);
wret = btrfs_cow_block(trans, root, left,
- parent, pslot - 1, &left, 0);
+ parent, pslot - 1, &left);
if (wret) {
ret = wret;
goto enospc;
btrfs_tree_lock(right);
btrfs_set_lock_blocking(right);
wret = btrfs_cow_block(trans, root, right,
- parent, pslot + 1, &right, 0);
+ parent, pslot + 1, &right);
if (wret) {
ret = wret;
goto enospc;
wret = 1;
} else {
ret = btrfs_cow_block(trans, root, left, parent,
- pslot - 1, &left, 0);
+ pslot - 1, &left);
if (ret)
wret = 1;
else {
} else {
ret = btrfs_cow_block(trans, root, right,
parent, pslot + 1,
- &right, 0);
+ &right);
if (ret)
wret = 1;
else {
u8 lowest_level = 0;
u64 blocknr;
u64 gen;
- struct btrfs_key prealloc_block;
lowest_level = p->lowest_level;
WARN_ON(lowest_level && ins_len > 0);
if (ins_len < 0)
lowest_unlock = 2;
- prealloc_block.objectid = 0;
-
again:
if (p->skip_locking)
b = btrfs_root_node(root);
!btrfs_header_flag(b, BTRFS_HEADER_FLAG_WRITTEN)) {
goto cow_done;
}
-
- /* ok, we have to cow, is our old prealloc the right
- * size?
- */
- if (prealloc_block.objectid &&
- prealloc_block.offset != b->len) {
- btrfs_release_path(root, p);
- btrfs_free_reserved_extent(root,
- prealloc_block.objectid,
- prealloc_block.offset);
- prealloc_block.objectid = 0;
- goto again;
- }
-
- /*
- * for higher level blocks, try not to allocate blocks
- * with the block and the parent locks held.
- */
- if (level > 0 && !prealloc_block.objectid) {
- u32 size = b->len;
- u64 hint = b->start;
-
- btrfs_release_path(root, p);
- ret = btrfs_reserve_extent(trans, root,
- size, size, 0,
- hint, (u64)-1,
- &prealloc_block, 0);
- BUG_ON(ret);
- goto again;
- }
-
btrfs_set_path_blocking(p);
wret = btrfs_cow_block(trans, root, b,
p->nodes[level + 1],
- p->slots[level + 1],
- &b, prealloc_block.objectid);
- prealloc_block.objectid = 0;
+ p->slots[level + 1], &b);
if (wret) {
free_extent_buffer(b);
ret = wret;
* we don't really know what they plan on doing with the path
* from here on, so for now just mark it as blocking
*/
- btrfs_set_path_blocking(p);
- if (prealloc_block.objectid) {
- btrfs_free_reserved_extent(root,
- prealloc_block.objectid,
- prealloc_block.offset);
- }
+ if (!p->leave_spinning)
+ btrfs_set_path_blocking(p);
return ret;
}
int ret;
eb = btrfs_lock_root_node(root);
- ret = btrfs_cow_block(trans, root, eb, NULL, 0, &eb, 0);
+ ret = btrfs_cow_block(trans, root, eb, NULL, 0, &eb);
BUG_ON(ret);
btrfs_set_lock_blocking(eb);
}
ret = btrfs_cow_block(trans, root, eb, parent, slot,
- &eb, 0);
+ &eb);
BUG_ON(ret);
if (root->root_key.objectid ==
spin_unlock(&root->node_lock);
ret = btrfs_update_extent_ref(trans, root, lower->start,
- lower->start, c->start,
+ lower->len, lower->start, c->start,
root->root_key.objectid,
trans->transid, level - 1);
BUG_ON(ret);
ret = insert_new_root(trans, root, path, level + 1);
if (ret)
return ret;
- } else {
+ } else if (!trans->transaction->delayed_refs.flushing) {
ret = push_nodes_for_insert(trans, root, path, level);
c = path->nodes[level];
if (!ret && btrfs_header_nritems(c) <
return ret;
}
-/*
- * push some data in the path leaf to the right, trying to free up at
- * least data_size bytes. returns zero if the push worked, nonzero otherwise
- *
- * returns 1 if the push failed because the other node didn't have enough
- * room, 0 if everything worked out and < 0 if there were major errors.
- */
-static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size,
- int empty)
+static noinline int __push_leaf_right(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ int data_size, int empty,
+ struct extent_buffer *right,
+ int free_space, u32 left_nritems)
{
struct extent_buffer *left = path->nodes[0];
- struct extent_buffer *right;
- struct extent_buffer *upper;
+ struct extent_buffer *upper = path->nodes[1];
struct btrfs_disk_key disk_key;
int slot;
u32 i;
- int free_space;
int push_space = 0;
int push_items = 0;
struct btrfs_item *item;
- u32 left_nritems;
u32 nr;
u32 right_nritems;
u32 data_end;
u32 this_item_size;
int ret;
- slot = path->slots[1];
- if (!path->nodes[1])
- return 1;
-
- upper = path->nodes[1];
- if (slot >= btrfs_header_nritems(upper) - 1)
- return 1;
-
- btrfs_assert_tree_locked(path->nodes[1]);
-
- right = read_node_slot(root, upper, slot + 1);
- btrfs_tree_lock(right);
- btrfs_set_lock_blocking(right);
-
- free_space = btrfs_leaf_free_space(root, right);
- if (free_space < data_size)
- goto out_unlock;
-
- /* cow and double check */
- ret = btrfs_cow_block(trans, root, right, upper,
- slot + 1, &right, 0);
- if (ret)
- goto out_unlock;
-
- free_space = btrfs_leaf_free_space(root, right);
- if (free_space < data_size)
- goto out_unlock;
-
- left_nritems = btrfs_header_nritems(left);
- if (left_nritems == 0)
- goto out_unlock;
-
if (empty)
nr = 0;
else
if (path->slots[0] >= left_nritems)
push_space += data_size;
+ slot = path->slots[1];
i = left_nritems - 1;
while (i >= nr) {
item = btrfs_item_nr(left, i);
return 1;
}
+/*
+ * push some data in the path leaf to the right, trying to free up at
+ * least data_size bytes. returns zero if the push worked, nonzero otherwise
+ *
+ * returns 1 if the push failed because the other node didn't have enough
+ * room, 0 if everything worked out and < 0 if there were major errors.
+ */
+static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
+{
+ struct extent_buffer *left = path->nodes[0];
+ struct extent_buffer *right;
+ struct extent_buffer *upper;
+ int slot;
+ int free_space;
+ u32 left_nritems;
+ int ret;
+
+ if (!path->nodes[1])
+ return 1;
+
+ slot = path->slots[1];
+ upper = path->nodes[1];
+ if (slot >= btrfs_header_nritems(upper) - 1)
+ return 1;
+
+ btrfs_assert_tree_locked(path->nodes[1]);
+
+ right = read_node_slot(root, upper, slot + 1);
+ btrfs_tree_lock(right);
+ btrfs_set_lock_blocking(right);
+
+ free_space = btrfs_leaf_free_space(root, right);
+ if (free_space < data_size)
+ goto out_unlock;
+
+ /* cow and double check */
+ ret = btrfs_cow_block(trans, root, right, upper,
+ slot + 1, &right);
+ if (ret)
+ goto out_unlock;
+
+ free_space = btrfs_leaf_free_space(root, right);
+ if (free_space < data_size)
+ goto out_unlock;
+
+ left_nritems = btrfs_header_nritems(left);
+ if (left_nritems == 0)
+ goto out_unlock;
+
+ return __push_leaf_right(trans, root, path, data_size, empty,
+ right, free_space, left_nritems);
+out_unlock:
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ return 1;
+}
+
/*
* push some data in the path leaf to the left, trying to free up at
* least data_size bytes. returns zero if the push worked, nonzero otherwise
*/
-static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size,
- int empty)
+static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int data_size,
+ int empty, struct extent_buffer *left,
+ int free_space, int right_nritems)
{
struct btrfs_disk_key disk_key;
struct extent_buffer *right = path->nodes[0];
- struct extent_buffer *left;
int slot;
int i;
- int free_space;
int push_space = 0;
int push_items = 0;
struct btrfs_item *item;
u32 old_left_nritems;
- u32 right_nritems;
u32 nr;
int ret = 0;
int wret;
u32 old_left_item_size;
slot = path->slots[1];
- if (slot == 0)
- return 1;
- if (!path->nodes[1])
- return 1;
-
- right_nritems = btrfs_header_nritems(right);
- if (right_nritems == 0)
- return 1;
-
- btrfs_assert_tree_locked(path->nodes[1]);
-
- left = read_node_slot(root, path->nodes[1], slot - 1);
- btrfs_tree_lock(left);
- btrfs_set_lock_blocking(left);
-
- free_space = btrfs_leaf_free_space(root, left);
- if (free_space < data_size) {
- ret = 1;
- goto out;
- }
-
- /* cow and double check */
- ret = btrfs_cow_block(trans, root, left,
- path->nodes[1], slot - 1, &left, 0);
- if (ret) {
- /* we hit -ENOSPC, but it isn't fatal here */
- ret = 1;
- goto out;
- }
-
- free_space = btrfs_leaf_free_space(root, left);
- if (free_space < data_size) {
- ret = 1;
- goto out;
- }
if (empty)
nr = right_nritems;
return ret;
}
+/*
+ * push some data in the path leaf to the left, trying to free up at
+ * least data_size bytes. returns zero if the push worked, nonzero otherwise
+ */
+static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
+{
+ struct extent_buffer *right = path->nodes[0];
+ struct extent_buffer *left;
+ int slot;
+ int free_space;
+ u32 right_nritems;
+ int ret = 0;
+
+ slot = path->slots[1];
+ if (slot == 0)
+ return 1;
+ if (!path->nodes[1])
+ return 1;
+
+ right_nritems = btrfs_header_nritems(right);
+ if (right_nritems == 0)
+ return 1;
+
+ btrfs_assert_tree_locked(path->nodes[1]);
+
+ left = read_node_slot(root, path->nodes[1], slot - 1);
+ btrfs_tree_lock(left);
+ btrfs_set_lock_blocking(left);
+
+ free_space = btrfs_leaf_free_space(root, left);
+ if (free_space < data_size) {
+ ret = 1;
+ goto out;
+ }
+
+ /* cow and double check */
+ ret = btrfs_cow_block(trans, root, left,
+ path->nodes[1], slot - 1, &left);
+ if (ret) {
+ /* we hit -ENOSPC, but it isn't fatal here */
+ ret = 1;
+ goto out;
+ }
+
+ free_space = btrfs_leaf_free_space(root, left);
+ if (free_space < data_size) {
+ ret = 1;
+ goto out;
+ }
+
+ return __push_leaf_left(trans, root, path, data_size,
+ empty, left, free_space, right_nritems);
+out:
+ btrfs_tree_unlock(left);
+ free_extent_buffer(left);
+ return ret;
+}
+
+/*
+ * split the path's leaf in two, making sure there is at least data_size
+ * available for the resulting leaf level of the path.
+ *
+ * returns 0 if all went well and < 0 on failure.
+ */
+static noinline int copy_for_split(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct extent_buffer *l,
+ struct extent_buffer *right,
+ int slot, int mid, int nritems)
+{
+ int data_copy_size;
+ int rt_data_off;
+ int i;
+ int ret = 0;
+ int wret;
+ struct btrfs_disk_key disk_key;
+
+ nritems = nritems - mid;
+ btrfs_set_header_nritems(right, nritems);
+ data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
+
+ copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(mid),
+ nritems * sizeof(struct btrfs_item));
+
+ copy_extent_buffer(right, l,
+ btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) -
+ data_copy_size, btrfs_leaf_data(l) +
+ leaf_data_end(root, l), data_copy_size);
+
+ rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
+ btrfs_item_end_nr(l, mid);
+
+ for (i = 0; i < nritems; i++) {
+ struct btrfs_item *item = btrfs_item_nr(right, i);
+ u32 ioff;
+
+ if (!right->map_token) {
+ map_extent_buffer(right, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &right->map_token, &right->kaddr,
+ &right->map_start, &right->map_len,
+ KM_USER1);
+ }
+
+ ioff = btrfs_item_offset(right, item);
+ btrfs_set_item_offset(right, item, ioff + rt_data_off);
+ }
+
+ if (right->map_token) {
+ unmap_extent_buffer(right, right->map_token, KM_USER1);
+ right->map_token = NULL;
+ }
+
+ btrfs_set_header_nritems(l, mid);
+ ret = 0;
+ btrfs_item_key(right, &disk_key, 0);
+ wret = insert_ptr(trans, root, path, &disk_key, right->start,
+ path->slots[1] + 1, 1);
+ if (wret)
+ ret = wret;
+
+ btrfs_mark_buffer_dirty(right);
+ btrfs_mark_buffer_dirty(l);
+ BUG_ON(path->slots[0] != slot);
+
+ ret = btrfs_update_ref(trans, root, l, right, 0, nritems);
+ BUG_ON(ret);
+
+ if (mid <= slot) {
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] -= mid;
+ path->slots[1] += 1;
+ } else {
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+
+ BUG_ON(path->slots[0] < 0);
+
+ return ret;
+}
+
/*
* split the path's leaf in two, making sure there is at least data_size
* available for the resulting leaf level of the path.
int mid;
int slot;
struct extent_buffer *right;
- int data_copy_size;
- int rt_data_off;
- int i;
int ret = 0;
int wret;
int double_split;
int num_doubles = 0;
- struct btrfs_disk_key disk_key;
/* first try to make some room by pushing left and right */
- if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY) {
+ if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY &&
+ !trans->transaction->delayed_refs.flushing) {
wret = push_leaf_right(trans, root, path, data_size, 0);
if (wret < 0)
return wret;
write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
(unsigned long)btrfs_header_chunk_tree_uuid(right),
BTRFS_UUID_SIZE);
+
if (mid <= slot) {
if (nritems == 1 ||
leaf_space_used(l, mid, nritems - mid) + data_size >
BTRFS_LEAF_DATA_SIZE(root)) {
if (slot >= nritems) {
+ struct btrfs_disk_key disk_key;
+
btrfs_cpu_key_to_disk(&disk_key, ins_key);
btrfs_set_header_nritems(right, 0);
wret = insert_ptr(trans, root, path,
if (leaf_space_used(l, 0, mid) + data_size >
BTRFS_LEAF_DATA_SIZE(root)) {
if (!extend && data_size && slot == 0) {
+ struct btrfs_disk_key disk_key;
+
btrfs_cpu_key_to_disk(&disk_key, ins_key);
btrfs_set_header_nritems(right, 0);
wret = insert_ptr(trans, root, path,
}
}
}
- nritems = nritems - mid;
- btrfs_set_header_nritems(right, nritems);
- data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
-
- copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
- btrfs_item_nr_offset(mid),
- nritems * sizeof(struct btrfs_item));
-
- copy_extent_buffer(right, l,
- btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) -
- data_copy_size, btrfs_leaf_data(l) +
- leaf_data_end(root, l), data_copy_size);
-
- rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
- btrfs_item_end_nr(l, mid);
-
- for (i = 0; i < nritems; i++) {
- struct btrfs_item *item = btrfs_item_nr(right, i);
- u32 ioff;
-
- if (!right->map_token) {
- map_extent_buffer(right, (unsigned long)item,
- sizeof(struct btrfs_item),
- &right->map_token, &right->kaddr,
- &right->map_start, &right->map_len,
- KM_USER1);
- }
-
- ioff = btrfs_item_offset(right, item);
- btrfs_set_item_offset(right, item, ioff + rt_data_off);
- }
-
- if (right->map_token) {
- unmap_extent_buffer(right, right->map_token, KM_USER1);
- right->map_token = NULL;
- }
-
- btrfs_set_header_nritems(l, mid);
- ret = 0;
- btrfs_item_key(right, &disk_key, 0);
- wret = insert_ptr(trans, root, path, &disk_key, right->start,
- path->slots[1] + 1, 1);
- if (wret)
- ret = wret;
-
- btrfs_mark_buffer_dirty(right);
- btrfs_mark_buffer_dirty(l);
- BUG_ON(path->slots[0] != slot);
- ret = btrfs_update_ref(trans, root, l, right, 0, nritems);
+ ret = copy_for_split(trans, root, path, l, right, slot, mid, nritems);
BUG_ON(ret);
- if (mid <= slot) {
- btrfs_tree_unlock(path->nodes[0]);
- free_extent_buffer(path->nodes[0]);
- path->nodes[0] = right;
- path->slots[0] -= mid;
- path->slots[1] += 1;
- } else {
- btrfs_tree_unlock(right);
- free_extent_buffer(right);
- }
-
- BUG_ON(path->slots[0] < 0);
-
if (double_split) {
BUG_ON(num_doubles != 0);
num_doubles++;
goto again;
}
+
return ret;
}
return -EAGAIN;
}
+ btrfs_set_path_blocking(path);
ret = split_leaf(trans, root, &orig_key, path,
sizeof(struct btrfs_item), 1);
path->keep_locks = 0;
BUG_ON(ret);
+ btrfs_unlock_up_safe(path, 1);
+ leaf = path->nodes[0];
+ BUG_ON(btrfs_leaf_free_space(root, leaf) < sizeof(struct btrfs_item));
+
+split:
/*
* make sure any changes to the path from split_leaf leave it
* in a blocking state
*/
btrfs_set_path_blocking(path);
- leaf = path->nodes[0];
- BUG_ON(btrfs_leaf_free_space(root, leaf) < sizeof(struct btrfs_item));
-
-split:
item = btrfs_item_nr(leaf, path->slots[0]);
orig_offset = btrfs_item_offset(leaf, item);
item_size = btrfs_item_size(leaf, item);
-
buf = kmalloc(item_size, GFP_NOFS);
read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf,
path->slots[0]), item_size);
}
/*
- * Given a key and some data, insert items into the tree.
- * This does all the path init required, making room in the tree if needed.
+ * this is a helper for btrfs_insert_empty_items, the main goal here is
+ * to save stack depth by doing the bulk of the work in a function
+ * that doesn't call btrfs_search_slot
*/
-int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
- struct btrfs_key *cpu_key, u32 *data_size,
- int nr)
+static noinline_for_stack int
+setup_items_for_insert(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_key *cpu_key, u32 *data_size,
+ u32 total_data, u32 total_size, int nr)
{
- struct extent_buffer *leaf;
struct btrfs_item *item;
- int ret = 0;
- int slot;
- int slot_orig;
int i;
u32 nritems;
- u32 total_size = 0;
- u32 total_data = 0;
unsigned int data_end;
struct btrfs_disk_key disk_key;
+ int ret;
+ struct extent_buffer *leaf;
+ int slot;
- for (i = 0; i < nr; i++)
- total_data += data_size[i];
-
- total_size = total_data + (nr * sizeof(struct btrfs_item));
- ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
- if (ret == 0)
- return -EEXIST;
- if (ret < 0)
- goto out;
-
- slot_orig = path->slots[0];
leaf = path->nodes[0];
+ slot = path->slots[0];
nritems = btrfs_header_nritems(leaf);
data_end = leaf_data_end(root, leaf);
BUG();
}
- slot = path->slots[0];
- BUG_ON(slot < 0);
-
if (slot != nritems) {
unsigned int old_data = btrfs_item_end_nr(leaf, slot);
data_end -= data_size[i];
btrfs_set_item_size(leaf, item, data_size[i]);
}
+
btrfs_set_header_nritems(leaf, nritems + nr);
- btrfs_mark_buffer_dirty(leaf);
ret = 0;
if (slot == 0) {
+ struct btrfs_disk_key disk_key;
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
ret = fixup_low_keys(trans, root, path, &disk_key, 1);
}
+ btrfs_unlock_up_safe(path, 1);
+ btrfs_mark_buffer_dirty(leaf);
if (btrfs_leaf_free_space(root, leaf) < 0) {
btrfs_print_leaf(root, leaf);
BUG();
}
+ return ret;
+}
+
+/*
+ * Given a key and some data, insert items into the tree.
+ * This does all the path init required, making room in the tree if needed.
+ */
+int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *cpu_key, u32 *data_size,
+ int nr)
+{
+ struct extent_buffer *leaf;
+ int ret = 0;
+ int slot;
+ int i;
+ u32 total_size = 0;
+ u32 total_data = 0;
+
+ for (i = 0; i < nr; i++)
+ total_data += data_size[i];
+
+ total_size = total_data + (nr * sizeof(struct btrfs_item));
+ ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
+ if (ret == 0)
+ return -EEXIST;
+ if (ret < 0)
+ goto out;
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ BUG_ON(slot < 0);
+
+ ret = setup_items_for_insert(trans, root, path, cpu_key, data_size,
+ total_data, total_size, nr);
+
out:
- btrfs_unlock_up_safe(path, 1);
return ret;
}
}
/* delete the leaf if it is mostly empty */
- if (used < BTRFS_LEAF_DATA_SIZE(root) / 4) {
+ if (used < BTRFS_LEAF_DATA_SIZE(root) / 4 &&
+ !trans->transaction->delayed_refs.flushing) {
/* push_leaf_left fixes the path.
* make sure the path still points to our leaf
* for possible call to del_ptr below
slot = path->slots[1];
extent_buffer_get(leaf);
+ btrfs_set_path_blocking(path);
wret = push_leaf_left(trans, root, path, 1, 1);
if (wret < 0 && wret != -ENOSPC)
ret = wret;
#define BTRFS_MAX_LEVEL 8
+/*
+ * files bigger than this get some pre-flushing when they are added
+ * to the ordered operations list. That way we limit the total
+ * work done by the commit
+ */
+#define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
+
/* holds pointers to all of the tree roots */
#define BTRFS_ROOT_TREE_OBJECTID 1ULL
int locks[BTRFS_MAX_LEVEL];
int reada;
/* keep some upper locks as we walk down */
- int keep_locks;
- int skip_locking;
int lowest_level;
/*
* set by btrfs_split_item, tells search_slot to keep all locks
* and to force calls to keep space in the nodes
*/
- int search_for_split;
+ unsigned int search_for_split:1;
+ unsigned int keep_locks:1;
+ unsigned int skip_locking:1;
+ unsigned int leave_spinning:1;
};
/*
struct rb_root block_group_cache_tree;
struct extent_io_tree pinned_extents;
- struct extent_io_tree pending_del;
- struct extent_io_tree extent_ins;
/* logical->physical extent mapping */
struct btrfs_mapping_tree mapping_tree;
u64 generation;
u64 last_trans_committed;
- u64 last_trans_new_blockgroup;
+
+ /*
+ * this is updated to the current trans every time a full commit
+ * is required instead of the faster short fsync log commits
+ */
+ u64 last_trans_log_full_commit;
u64 open_ioctl_trans;
unsigned long mount_opt;
u64 max_extent;
struct mutex tree_log_mutex;
struct mutex transaction_kthread_mutex;
struct mutex cleaner_mutex;
- struct mutex extent_ins_mutex;
struct mutex pinned_mutex;
struct mutex chunk_mutex;
struct mutex drop_mutex;
struct mutex volume_mutex;
struct mutex tree_reloc_mutex;
+
+ /*
+ * this protects the ordered operations list only while we are
+ * processing all of the entries on it. This way we make
+ * sure the commit code doesn't find the list temporarily empty
+ * because another function happens to be doing non-waiting preflush
+ * before jumping into the main commit.
+ */
+ struct mutex ordered_operations_mutex;
+
struct list_head trans_list;
struct list_head hashers;
struct list_head dead_roots;
* ordered extents
*/
spinlock_t ordered_extent_lock;
+
+ /*
+ * all of the data=ordered extents pending writeback
+ * these can span multiple transactions and basically include
+ * every dirty data page that isn't from nodatacow
+ */
struct list_head ordered_extents;
+
+ /*
+ * all of the inodes that have delalloc bytes. It is possible for
+ * this list to be empty even when there is still dirty data=ordered
+ * extents waiting to finish IO.
+ */
struct list_head delalloc_inodes;
+ /*
+ * special rename and truncate targets that must be on disk before
+ * we're allowed to commit. This is basically the ext3 style
+ * data=ordered list.
+ */
+ struct list_head ordered_operations;
+
/*
* there is a pool of worker threads for checksumming during writes
* and a pool for checksumming after reads. This is because readers
atomic_t throttle_gen;
u64 total_pinned;
+
+ /* protected by the delalloc lock, used to keep from writing
+ * metadata until there is a nice batch
+ */
+ u64 dirty_metadata_bytes;
struct list_head dirty_cowonly_roots;
struct btrfs_fs_devices *fs_devices;
}
/* extent-tree.c */
+int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, unsigned long count);
int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
-int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
- u64 num_bytes, u32 *refs);
int btrfs_update_pinned_extents(struct btrfs_root *root,
u64 bytenr, u64 num, int pin);
int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *leaf);
int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid, u64 bytenr);
-int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
- struct btrfs_root *root);
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
struct btrfs_block_group_cache *btrfs_lookup_block_group(
struct btrfs_fs_info *info,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid);
int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
+ struct btrfs_root *root, u64 bytenr, u64 num_bytes,
u64 orig_parent, u64 parent,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid);
int btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,
- struct extent_buffer **cow_ret, u64 prealloc_dest);
+ struct extent_buffer **cow_ret);
int btrfs_copy_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
--- /dev/null
+/*
+ * Copyright (C) 2009 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/sched.h>
+#include <linux/sort.h>
+#include <linux/ftrace.h>
+#include "ctree.h"
+#include "delayed-ref.h"
+#include "transaction.h"
+
+/*
+ * delayed back reference update tracking. For subvolume trees
+ * we queue up extent allocations and backref maintenance for
+ * delayed processing. This avoids deep call chains where we
+ * add extents in the middle of btrfs_search_slot, and it allows
+ * us to buffer up frequently modified backrefs in an rb tree instead
+ * of hammering updates on the extent allocation tree.
+ *
+ * Right now this code is only used for reference counted trees, but
+ * the long term goal is to get rid of the similar code for delayed
+ * extent tree modifications.
+ */
+
+/*
+ * entries in the rb tree are ordered by the byte number of the extent
+ * and by the byte number of the parent block.
+ */
+static int comp_entry(struct btrfs_delayed_ref_node *ref,
+ u64 bytenr, u64 parent)
+{
+ if (bytenr < ref->bytenr)
+ return -1;
+ if (bytenr > ref->bytenr)
+ return 1;
+ if (parent < ref->parent)
+ return -1;
+ if (parent > ref->parent)
+ return 1;
+ return 0;
+}
+
+/*
+ * insert a new ref into the rbtree. This returns any existing refs
+ * for the same (bytenr,parent) tuple, or NULL if the new node was properly
+ * inserted.
+ */
+static struct btrfs_delayed_ref_node *tree_insert(struct rb_root *root,
+ u64 bytenr, u64 parent,
+ struct rb_node *node)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent_node = NULL;
+ struct btrfs_delayed_ref_node *entry;
+ int cmp;
+
+ while (*p) {
+ parent_node = *p;
+ entry = rb_entry(parent_node, struct btrfs_delayed_ref_node,
+ rb_node);
+
+ cmp = comp_entry(entry, bytenr, parent);
+ if (cmp < 0)
+ p = &(*p)->rb_left;
+ else if (cmp > 0)
+ p = &(*p)->rb_right;
+ else
+ return entry;
+ }
+
+ entry = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+ rb_link_node(node, parent_node, p);
+ rb_insert_color(node, root);
+ return NULL;
+}
+
+/*
+ * find an entry based on (bytenr,parent). This returns the delayed
+ * ref if it was able to find one, or NULL if nothing was in that spot
+ */
+static struct btrfs_delayed_ref_node *tree_search(struct rb_root *root,
+ u64 bytenr, u64 parent,
+ struct btrfs_delayed_ref_node **last)
+{
+ struct rb_node *n = root->rb_node;
+ struct btrfs_delayed_ref_node *entry;
+ int cmp;
+
+ while (n) {
+ entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
+ WARN_ON(!entry->in_tree);
+ if (last)
+ *last = entry;
+
+ cmp = comp_entry(entry, bytenr, parent);
+ if (cmp < 0)
+ n = n->rb_left;
+ else if (cmp > 0)
+ n = n->rb_right;
+ else
+ return entry;
+ }
+ return NULL;
+}
+
+int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
+ struct btrfs_delayed_ref_head *head)
+{
+ struct btrfs_delayed_ref_root *delayed_refs;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ assert_spin_locked(&delayed_refs->lock);
+ if (mutex_trylock(&head->mutex))
+ return 0;
+
+ atomic_inc(&head->node.refs);
+ spin_unlock(&delayed_refs->lock);
+
+ mutex_lock(&head->mutex);
+ spin_lock(&delayed_refs->lock);
+ if (!head->node.in_tree) {
+ mutex_unlock(&head->mutex);
+ btrfs_put_delayed_ref(&head->node);
+ return -EAGAIN;
+ }
+ btrfs_put_delayed_ref(&head->node);
+ return 0;
+}
+
+int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
+ struct list_head *cluster, u64 start)
+{
+ int count = 0;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct rb_node *node;
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_head *head;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ if (start == 0) {
+ node = rb_first(&delayed_refs->root);
+ } else {
+ ref = NULL;
+ tree_search(&delayed_refs->root, start, (u64)-1, &ref);
+ if (ref) {
+ struct btrfs_delayed_ref_node *tmp;
+
+ node = rb_prev(&ref->rb_node);
+ while (node) {
+ tmp = rb_entry(node,
+ struct btrfs_delayed_ref_node,
+ rb_node);
+ if (tmp->bytenr < start)
+ break;
+ ref = tmp;
+ node = rb_prev(&ref->rb_node);
+ }
+ node = &ref->rb_node;
+ } else
+ node = rb_first(&delayed_refs->root);
+ }
+again:
+ while (node && count < 32) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+ if (btrfs_delayed_ref_is_head(ref)) {
+ head = btrfs_delayed_node_to_head(ref);
+ if (list_empty(&head->cluster)) {
+ list_add_tail(&head->cluster, cluster);
+ delayed_refs->run_delayed_start =
+ head->node.bytenr;
+ count++;
+
+ WARN_ON(delayed_refs->num_heads_ready == 0);
+ delayed_refs->num_heads_ready--;
+ } else if (count) {
+ /* the goal of the clustering is to find extents
+ * that are likely to end up in the same extent
+ * leaf on disk. So, we don't want them spread
+ * all over the tree. Stop now if we've hit
+ * a head that was already in use
+ */
+ break;
+ }
+ }
+ node = rb_next(node);
+ }
+ if (count) {
+ return 0;
+ } else if (start) {
+ /*
+ * we've gone to the end of the rbtree without finding any
+ * clusters. start from the beginning and try again
+ */
+ start = 0;
+ node = rb_first(&delayed_refs->root);
+ goto again;
+ }
+ return 1;
+}
+
+/*
+ * This checks to see if there are any delayed refs in the
+ * btree for a given bytenr. It returns one if it finds any
+ * and zero otherwise.
+ *
+ * If it only finds a head node, it returns 0.
+ *
+ * The idea is to use this when deciding if you can safely delete an
+ * extent from the extent allocation tree. There may be a pending
+ * ref in the rbtree that adds or removes references, so as long as this
+ * returns one you need to leave the BTRFS_EXTENT_ITEM in the extent
+ * allocation tree.
+ */
+int btrfs_delayed_ref_pending(struct btrfs_trans_handle *trans, u64 bytenr)
+{
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct rb_node *prev_node;
+ int ret = 0;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+
+ ref = tree_search(&delayed_refs->root, bytenr, (u64)-1, NULL);
+ if (ref) {
+ prev_node = rb_prev(&ref->rb_node);
+ if (!prev_node)
+ goto out;
+ ref = rb_entry(prev_node, struct btrfs_delayed_ref_node,
+ rb_node);
+ if (ref->bytenr == bytenr)
+ ret = 1;
+ }
+out:
+ spin_unlock(&delayed_refs->lock);
+ return ret;
+}
+
+/*
+ * helper function to lookup reference count
+ *
+ * the head node for delayed ref is used to store the sum of all the
+ * reference count modifications queued up in the rbtree. This way you
+ * can check to see what the reference count would be if all of the
+ * delayed refs are processed.
+ */
+int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs)
+{
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_head *head;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_item *ei;
+ struct btrfs_key key;
+ u32 num_refs;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ key.offset = num_bytes;
+ delayed_refs = &trans->transaction->delayed_refs;
+again:
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root,
+ &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ if (ret == 0) {
+ leaf = path->nodes[0];
+ ei = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_item);
+ num_refs = btrfs_extent_refs(leaf, ei);
+ } else {
+ num_refs = 0;
+ ret = 0;
+ }
+
+ spin_lock(&delayed_refs->lock);
+ ref = tree_search(&delayed_refs->root, bytenr, (u64)-1, NULL);
+ if (ref) {
+ head = btrfs_delayed_node_to_head(ref);
+ if (mutex_trylock(&head->mutex)) {
+ num_refs += ref->ref_mod;
+ mutex_unlock(&head->mutex);
+ *refs = num_refs;
+ goto out;
+ }
+
+ atomic_inc(&ref->refs);
+ spin_unlock(&delayed_refs->lock);
+
+ btrfs_release_path(root->fs_info->extent_root, path);
+
+ mutex_lock(&head->mutex);
+ mutex_unlock(&head->mutex);
+ btrfs_put_delayed_ref(ref);
+ goto again;
+ } else {
+ *refs = num_refs;
+ }
+out:
+ spin_unlock(&delayed_refs->lock);
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * helper function to update an extent delayed ref in the
+ * rbtree. existing and update must both have the same
+ * bytenr and parent
+ *
+ * This may free existing if the update cancels out whatever
+ * operation it was doing.
+ */
+static noinline void
+update_existing_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_delayed_ref_root *delayed_refs,
+ struct btrfs_delayed_ref_node *existing,
+ struct btrfs_delayed_ref_node *update)
+{
+ struct btrfs_delayed_ref *existing_ref;
+ struct btrfs_delayed_ref *ref;
+
+ existing_ref = btrfs_delayed_node_to_ref(existing);
+ ref = btrfs_delayed_node_to_ref(update);
+
+ if (ref->pin)
+ existing_ref->pin = 1;
+
+ if (ref->action != existing_ref->action) {
+ /*
+ * this is effectively undoing either an add or a
+ * drop. We decrement the ref_mod, and if it goes
+ * down to zero we just delete the entry without
+ * every changing the extent allocation tree.
+ */
+ existing->ref_mod--;
+ if (existing->ref_mod == 0) {
+ rb_erase(&existing->rb_node,
+ &delayed_refs->root);
+ existing->in_tree = 0;
+ btrfs_put_delayed_ref(existing);
+ delayed_refs->num_entries--;
+ if (trans->delayed_ref_updates)
+ trans->delayed_ref_updates--;
+ }
+ } else {
+ if (existing_ref->action == BTRFS_ADD_DELAYED_REF) {
+ /* if we're adding refs, make sure all the
+ * details match up. The extent could
+ * have been totally freed and reallocated
+ * by a different owner before the delayed
+ * ref entries were removed.
+ */
+ existing_ref->owner_objectid = ref->owner_objectid;
+ existing_ref->generation = ref->generation;
+ existing_ref->root = ref->root;
+ existing->num_bytes = update->num_bytes;
+ }
+ /*
+ * the action on the existing ref matches
+ * the action on the ref we're trying to add.
+ * Bump the ref_mod by one so the backref that
+ * is eventually added/removed has the correct
+ * reference count
+ */
+ existing->ref_mod += update->ref_mod;
+ }
+}
+
+/*
+ * helper function to update the accounting in the head ref
+ * existing and update must have the same bytenr
+ */
+static noinline void
+update_existing_head_ref(struct btrfs_delayed_ref_node *existing,
+ struct btrfs_delayed_ref_node *update)
+{
+ struct btrfs_delayed_ref_head *existing_ref;
+ struct btrfs_delayed_ref_head *ref;
+
+ existing_ref = btrfs_delayed_node_to_head(existing);
+ ref = btrfs_delayed_node_to_head(update);
+
+ if (ref->must_insert_reserved) {
+ /* if the extent was freed and then
+ * reallocated before the delayed ref
+ * entries were processed, we can end up
+ * with an existing head ref without
+ * the must_insert_reserved flag set.
+ * Set it again here
+ */
+ existing_ref->must_insert_reserved = ref->must_insert_reserved;
+
+ /*
+ * update the num_bytes so we make sure the accounting
+ * is done correctly
+ */
+ existing->num_bytes = update->num_bytes;
+
+ }
+
+ /*
+ * update the reference mod on the head to reflect this new operation
+ */
+ existing->ref_mod += update->ref_mod;
+}
+
+/*
+ * helper function to actually insert a delayed ref into the rbtree.
+ * this does all the dirty work in terms of maintaining the correct
+ * overall modification count in the head node and properly dealing
+ * with updating existing nodes as new modifications are queued.
+ */
+static noinline int __btrfs_add_delayed_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_delayed_ref_node *ref,
+ u64 bytenr, u64 num_bytes, u64 parent, u64 ref_root,
+ u64 ref_generation, u64 owner_objectid, int action,
+ int pin)
+{
+ struct btrfs_delayed_ref_node *existing;
+ struct btrfs_delayed_ref *full_ref;
+ struct btrfs_delayed_ref_head *head_ref = NULL;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ int count_mod = 1;
+ int must_insert_reserved = 0;
+
+ /*
+ * the head node stores the sum of all the mods, so dropping a ref
+ * should drop the sum in the head node by one.
+ */
+ if (parent == (u64)-1) {
+ if (action == BTRFS_DROP_DELAYED_REF)
+ count_mod = -1;
+ else if (action == BTRFS_UPDATE_DELAYED_HEAD)
+ count_mod = 0;
+ }
+
+ /*
+ * BTRFS_ADD_DELAYED_EXTENT means that we need to update
+ * the reserved accounting when the extent is finally added, or
+ * if a later modification deletes the delayed ref without ever
+ * inserting the extent into the extent allocation tree.
+ * ref->must_insert_reserved is the flag used to record
+ * that accounting mods are required.
+ *
+ * Once we record must_insert_reserved, switch the action to
+ * BTRFS_ADD_DELAYED_REF because other special casing is not required.
+ */
+ if (action == BTRFS_ADD_DELAYED_EXTENT) {
+ must_insert_reserved = 1;
+ action = BTRFS_ADD_DELAYED_REF;
+ } else {
+ must_insert_reserved = 0;
+ }
+
+
+ delayed_refs = &trans->transaction->delayed_refs;
+
+ /* first set the basic ref node struct up */
+ atomic_set(&ref->refs, 1);
+ ref->bytenr = bytenr;
+ ref->parent = parent;
+ ref->ref_mod = count_mod;
+ ref->in_tree = 1;
+ ref->num_bytes = num_bytes;
+
+ if (btrfs_delayed_ref_is_head(ref)) {
+ head_ref = btrfs_delayed_node_to_head(ref);
+ head_ref->must_insert_reserved = must_insert_reserved;
+ INIT_LIST_HEAD(&head_ref->cluster);
+ mutex_init(&head_ref->mutex);
+ } else {
+ full_ref = btrfs_delayed_node_to_ref(ref);
+ full_ref->root = ref_root;
+ full_ref->generation = ref_generation;
+ full_ref->owner_objectid = owner_objectid;
+ full_ref->pin = pin;
+ full_ref->action = action;
+ }
+
+ existing = tree_insert(&delayed_refs->root, bytenr,
+ parent, &ref->rb_node);
+
+ if (existing) {
+ if (btrfs_delayed_ref_is_head(ref))
+ update_existing_head_ref(existing, ref);
+ else
+ update_existing_ref(trans, delayed_refs, existing, ref);
+
+ /*
+ * we've updated the existing ref, free the newly
+ * allocated ref
+ */
+ kfree(ref);
+ } else {
+ if (btrfs_delayed_ref_is_head(ref)) {
+ delayed_refs->num_heads++;
+ delayed_refs->num_heads_ready++;
+ }
+ delayed_refs->num_entries++;
+ trans->delayed_ref_updates++;
+ }
+ return 0;
+}
+
+/*
+ * add a delayed ref to the tree. This does all of the accounting required
+ * to make sure the delayed ref is eventually processed before this
+ * transaction commits.
+ */
+int btrfs_add_delayed_ref(struct btrfs_trans_handle *trans,
+ u64 bytenr, u64 num_bytes, u64 parent, u64 ref_root,
+ u64 ref_generation, u64 owner_objectid, int action,
+ int pin)
+{
+ struct btrfs_delayed_ref *ref;
+ struct btrfs_delayed_ref_head *head_ref;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ int ret;
+
+ ref = kmalloc(sizeof(*ref), GFP_NOFS);
+ if (!ref)
+ return -ENOMEM;
+
+ /*
+ * the parent = 0 case comes from cases where we don't actually
+ * know the parent yet. It will get updated later via a add/drop
+ * pair.
+ */
+ if (parent == 0)
+ parent = bytenr;
+
+ head_ref = kmalloc(sizeof(*head_ref), GFP_NOFS);
+ if (!head_ref) {
+ kfree(ref);
+ return -ENOMEM;
+ }
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+
+ /*
+ * insert both the head node and the new ref without dropping
+ * the spin lock
+ */
+ ret = __btrfs_add_delayed_ref(trans, &head_ref->node, bytenr, num_bytes,
+ (u64)-1, 0, 0, 0, action, pin);
+ BUG_ON(ret);
+
+ ret = __btrfs_add_delayed_ref(trans, &ref->node, bytenr, num_bytes,
+ parent, ref_root, ref_generation,
+ owner_objectid, action, pin);
+ BUG_ON(ret);
+ spin_unlock(&delayed_refs->lock);
+ return 0;
+}
+
+/*
+ * this does a simple search for the head node for a given extent.
+ * It must be called with the delayed ref spinlock held, and it returns
+ * the head node if any where found, or NULL if not.
+ */
+struct btrfs_delayed_ref_head *
+btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
+{
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_root *delayed_refs;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ ref = tree_search(&delayed_refs->root, bytenr, (u64)-1, NULL);
+ if (ref)
+ return btrfs_delayed_node_to_head(ref);
+ return NULL;
+}
+
+/*
+ * add a delayed ref to the tree. This does all of the accounting required
+ * to make sure the delayed ref is eventually processed before this
+ * transaction commits.
+ *
+ * The main point of this call is to add and remove a backreference in a single
+ * shot, taking the lock only once, and only searching for the head node once.
+ *
+ * It is the same as doing a ref add and delete in two separate calls.
+ */
+int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
+ u64 bytenr, u64 num_bytes, u64 orig_parent,
+ u64 parent, u64 orig_ref_root, u64 ref_root,
+ u64 orig_ref_generation, u64 ref_generation,
+ u64 owner_objectid, int pin)
+{
+ struct btrfs_delayed_ref *ref;
+ struct btrfs_delayed_ref *old_ref;
+ struct btrfs_delayed_ref_head *head_ref;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ int ret;
+
+ ref = kmalloc(sizeof(*ref), GFP_NOFS);
+ if (!ref)
+ return -ENOMEM;
+
+ old_ref = kmalloc(sizeof(*old_ref), GFP_NOFS);
+ if (!old_ref) {
+ kfree(ref);
+ return -ENOMEM;
+ }
+
+ /*
+ * the parent = 0 case comes from cases where we don't actually
+ * know the parent yet. It will get updated later via a add/drop
+ * pair.
+ */
+ if (parent == 0)
+ parent = bytenr;
+ if (orig_parent == 0)
+ orig_parent = bytenr;
+
+ head_ref = kmalloc(sizeof(*head_ref), GFP_NOFS);
+ if (!head_ref) {
+ kfree(ref);
+ kfree(old_ref);
+ return -ENOMEM;
+ }
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+
+ /*
+ * insert both the head node and the new ref without dropping
+ * the spin lock
+ */
+ ret = __btrfs_add_delayed_ref(trans, &head_ref->node, bytenr, num_bytes,
+ (u64)-1, 0, 0, 0,
+ BTRFS_UPDATE_DELAYED_HEAD, 0);
+ BUG_ON(ret);
+
+ ret = __btrfs_add_delayed_ref(trans, &ref->node, bytenr, num_bytes,
+ parent, ref_root, ref_generation,
+ owner_objectid, BTRFS_ADD_DELAYED_REF, 0);
+ BUG_ON(ret);
+
+ ret = __btrfs_add_delayed_ref(trans, &old_ref->node, bytenr, num_bytes,
+ orig_parent, orig_ref_root,
+ orig_ref_generation, owner_objectid,
+ BTRFS_DROP_DELAYED_REF, pin);
+ BUG_ON(ret);
+ spin_unlock(&delayed_refs->lock);
+ return 0;
+}
--- /dev/null
+/*
+ * Copyright (C) 2008 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+#ifndef __DELAYED_REF__
+#define __DELAYED_REF__
+
+/* these are the possible values of struct btrfs_delayed_ref->action */
+#define BTRFS_ADD_DELAYED_REF 1 /* add one backref to the tree */
+#define BTRFS_DROP_DELAYED_REF 2 /* delete one backref from the tree */
+#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
+#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */
+
+struct btrfs_delayed_ref_node {
+ struct rb_node rb_node;
+
+ /* the starting bytenr of the extent */
+ u64 bytenr;
+
+ /* the parent our backref will point to */
+ u64 parent;
+
+ /* the size of the extent */
+ u64 num_bytes;
+
+ /* ref count on this data structure */
+ atomic_t refs;
+
+ /*
+ * how many refs is this entry adding or deleting. For
+ * head refs, this may be a negative number because it is keeping
+ * track of the total mods done to the reference count.
+ * For individual refs, this will always be a positive number
+ *
+ * It may be more than one, since it is possible for a single
+ * parent to have more than one ref on an extent
+ */
+ int ref_mod;
+
+ /* is this node still in the rbtree? */
+ unsigned int in_tree:1;
+};
+
+/*
+ * the head refs are used to hold a lock on a given extent, which allows us
+ * to make sure that only one process is running the delayed refs
+ * at a time for a single extent. They also store the sum of all the
+ * reference count modifications we've queued up.
+ */
+struct btrfs_delayed_ref_head {
+ struct btrfs_delayed_ref_node node;
+
+ /*
+ * the mutex is held while running the refs, and it is also
+ * held when checking the sum of reference modifications.
+ */
+ struct mutex mutex;
+
+ struct list_head cluster;
+
+ /*
+ * when a new extent is allocated, it is just reserved in memory
+ * The actual extent isn't inserted into the extent allocation tree
+ * until the delayed ref is processed. must_insert_reserved is
+ * used to flag a delayed ref so the accounting can be updated
+ * when a full insert is done.
+ *
+ * It is possible the extent will be freed before it is ever
+ * inserted into the extent allocation tree. In this case
+ * we need to update the in ram accounting to properly reflect
+ * the free has happened.
+ */
+ unsigned int must_insert_reserved:1;
+};
+
+struct btrfs_delayed_ref {
+ struct btrfs_delayed_ref_node node;
+
+ /* the root objectid our ref will point to */
+ u64 root;
+
+ /* the generation for the backref */
+ u64 generation;
+
+ /* owner_objectid of the backref */
+ u64 owner_objectid;
+
+ /* operation done by this entry in the rbtree */
+ u8 action;
+
+ /* if pin == 1, when the extent is freed it will be pinned until
+ * transaction commit
+ */
+ unsigned int pin:1;
+};
+
+struct btrfs_delayed_ref_root {
+ struct rb_root root;
+
+ /* this spin lock protects the rbtree and the entries inside */
+ spinlock_t lock;
+
+ /* how many delayed ref updates we've queued, used by the
+ * throttling code
+ */
+ unsigned long num_entries;
+
+ /* total number of head nodes in tree */
+ unsigned long num_heads;
+
+ /* total number of head nodes ready for processing */
+ unsigned long num_heads_ready;
+
+ /*
+ * set when the tree is flushing before a transaction commit,
+ * used by the throttling code to decide if new updates need
+ * to be run right away
+ */
+ int flushing;
+
+ u64 run_delayed_start;
+};
+
+static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
+{
+ WARN_ON(atomic_read(&ref->refs) == 0);
+ if (atomic_dec_and_test(&ref->refs)) {
+ WARN_ON(ref->in_tree);
+ kfree(ref);
+ }
+}
+
+int btrfs_add_delayed_ref(struct btrfs_trans_handle *trans,
+ u64 bytenr, u64 num_bytes, u64 parent, u64 ref_root,
+ u64 ref_generation, u64 owner_objectid, int action,
+ int pin);
+
+struct btrfs_delayed_ref_head *
+btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr);
+int btrfs_delayed_ref_pending(struct btrfs_trans_handle *trans, u64 bytenr);
+int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs);
+int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
+ u64 bytenr, u64 num_bytes, u64 orig_parent,
+ u64 parent, u64 orig_ref_root, u64 ref_root,
+ u64 orig_ref_generation, u64 ref_generation,
+ u64 owner_objectid, int pin);
+int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
+ struct btrfs_delayed_ref_head *head);
+int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
+ struct list_head *cluster, u64 search_start);
+/*
+ * a node might live in a head or a regular ref, this lets you
+ * test for the proper type to use.
+ */
+static int btrfs_delayed_ref_is_head(struct btrfs_delayed_ref_node *node)
+{
+ return node->parent == (u64)-1;
+}
+
+/*
+ * helper functions to cast a node into its container
+ */
+static inline struct btrfs_delayed_ref *
+btrfs_delayed_node_to_ref(struct btrfs_delayed_ref_node *node)
+{
+ WARN_ON(btrfs_delayed_ref_is_head(node));
+ return container_of(node, struct btrfs_delayed_ref, node);
+
+}
+
+static inline struct btrfs_delayed_ref_head *
+btrfs_delayed_node_to_head(struct btrfs_delayed_ref_node *node)
+{
+ WARN_ON(!btrfs_delayed_ref_is_head(node));
+ return container_of(node, struct btrfs_delayed_ref_head, node);
+
+}
+#endif
key.objectid = dir;
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
key.offset = btrfs_name_hash(name, name_len);
+
path = btrfs_alloc_path();
+ path->leave_spinning = 1;
+
data_size = sizeof(*dir_item) + name_len;
dir_item = insert_with_overflow(trans, root, path, &key, data_size,
name, name_len);
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_io_tree *tree;
+ struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
+ struct extent_buffer *eb;
+ int was_dirty;
+
tree = &BTRFS_I(page->mapping->host)->io_tree;
+ if (!(current->flags & PF_MEMALLOC)) {
+ return extent_write_full_page(tree, page,
+ btree_get_extent, wbc);
+ }
- if (current->flags & PF_MEMALLOC) {
- redirty_page_for_writepage(wbc, page);
- unlock_page(page);
- return 0;
+ redirty_page_for_writepage(wbc, page);
+ eb = btrfs_find_tree_block(root, page_offset(page),
+ PAGE_CACHE_SIZE);
+ WARN_ON(!eb);
+
+ was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
+ if (!was_dirty) {
+ spin_lock(&root->fs_info->delalloc_lock);
+ root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE;
+ spin_unlock(&root->fs_info->delalloc_lock);
}
- return extent_write_full_page(tree, page, btree_get_extent, wbc);
+ free_extent_buffer(eb);
+
+ unlock_page(page);
+ return 0;
}
static int btree_writepages(struct address_space *mapping,
struct extent_io_tree *tree;
tree = &BTRFS_I(mapping->host)->io_tree;
if (wbc->sync_mode == WB_SYNC_NONE) {
+ struct btrfs_root *root = BTRFS_I(mapping->host)->root;
u64 num_dirty;
- u64 start = 0;
unsigned long thresh = 32 * 1024 * 1024;
if (wbc->for_kupdate)
return 0;
- num_dirty = count_range_bits(tree, &start, (u64)-1,
- thresh, EXTENT_DIRTY);
+ /* this is a bit racy, but that's ok */
+ num_dirty = root->fs_info->dirty_metadata_bytes;
if (num_dirty < thresh)
return 0;
}
root->fs_info->running_transaction->transid) {
btrfs_assert_tree_locked(buf);
- /* ugh, clear_extent_buffer_dirty can be expensive */
- btrfs_set_lock_blocking(buf);
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
+ spin_lock(&root->fs_info->delalloc_lock);
+ if (root->fs_info->dirty_metadata_bytes >= buf->len)
+ root->fs_info->dirty_metadata_bytes -= buf->len;
+ else
+ WARN_ON(1);
+ spin_unlock(&root->fs_info->delalloc_lock);
+ }
+ /* ugh, clear_extent_buffer_dirty needs to lock the page */
+ btrfs_set_lock_blocking(buf);
clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
buf);
}
vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
- if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) {
- printk(KERN_INFO "btrfs: total reference cache "
- "size %llu\n",
- root->fs_info->total_ref_cache_size);
- }
-
mutex_lock(&root->fs_info->trans_mutex);
cur = root->fs_info->running_transaction;
if (!cur) {
mutex_unlock(&root->fs_info->trans_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
+
sleep:
wake_up_process(root->fs_info->cleaner_kthread);
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
INIT_LIST_HEAD(&fs_info->dead_roots);
INIT_LIST_HEAD(&fs_info->hashers);
INIT_LIST_HEAD(&fs_info->delalloc_inodes);
+ INIT_LIST_HEAD(&fs_info->ordered_operations);
spin_lock_init(&fs_info->delalloc_lock);
spin_lock_init(&fs_info->new_trans_lock);
spin_lock_init(&fs_info->ref_cache_lock);
extent_io_tree_init(&fs_info->pinned_extents,
fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_io_tree_init(&fs_info->pending_del,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_io_tree_init(&fs_info->extent_ins,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
INIT_LIST_HEAD(&fs_info->dead_reloc_roots);
insert_inode_hash(fs_info->btree_inode);
mutex_init(&fs_info->trans_mutex);
+ mutex_init(&fs_info->ordered_operations_mutex);
mutex_init(&fs_info->tree_log_mutex);
mutex_init(&fs_info->drop_mutex);
- mutex_init(&fs_info->extent_ins_mutex);
mutex_init(&fs_info->pinned_mutex);
mutex_init(&fs_info->chunk_mutex);
mutex_init(&fs_info->transaction_kthread_mutex);
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
u64 transid = btrfs_header_generation(buf);
struct inode *btree_inode = root->fs_info->btree_inode;
-
- btrfs_set_lock_blocking(buf);
+ int was_dirty;
btrfs_assert_tree_locked(buf);
if (transid != root->fs_info->generation) {
(unsigned long long)root->fs_info->generation);
WARN_ON(1);
}
- set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
+ was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
+ buf);
+ if (!was_dirty) {
+ spin_lock(&root->fs_info->delalloc_lock);
+ root->fs_info->dirty_metadata_bytes += buf->len;
+ spin_unlock(&root->fs_info->delalloc_lock);
+ }
}
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
int btree_lock_page_hook(struct page *page)
{
struct inode *inode = page->mapping->host;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_buffer *eb;
unsigned long len;
btrfs_tree_lock(eb);
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
+
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
+ spin_lock(&root->fs_info->delalloc_lock);
+ if (root->fs_info->dirty_metadata_bytes >= eb->len)
+ root->fs_info->dirty_metadata_bytes -= eb->len;
+ else
+ WARN_ON(1);
+ spin_unlock(&root->fs_info->delalloc_lock);
+ }
+
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
out:
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
+void btrfs_mark_buffer_dirty_nonblocking(struct extent_buffer *buf);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
int wait_on_tree_block_writeback(struct btrfs_root *root,
int del;
};
-static int finish_current_insert(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all);
-static int del_pending_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all);
-static int pin_down_bytes(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int is_data);
+static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, struct btrfs_key *ins,
+ int ref_mod);
+static int update_reserved_extents(struct btrfs_root *root,
+ u64 bytenr, u64 num, int reserve);
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,
int mark_free);
+static noinline int __btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, int pin,
+ int ref_to_drop);
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
return ret;
}
-/*
- * updates all the backrefs that are pending on update_list for the
- * extent_root
- */
-static noinline int update_backrefs(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct btrfs_path *path,
- struct list_head *update_list)
-{
- struct btrfs_key key;
- struct btrfs_extent_ref *ref;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct pending_extent_op *op;
- struct extent_buffer *leaf;
- int ret = 0;
- struct list_head *cur = update_list->next;
- u64 ref_objectid;
- u64 ref_root = extent_root->root_key.objectid;
-
- op = list_entry(cur, struct pending_extent_op, list);
-
-search:
- key.objectid = op->bytenr;
- key.type = BTRFS_EXTENT_REF_KEY;
- key.offset = op->orig_parent;
-
- ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1);
- BUG_ON(ret);
-
- leaf = path->nodes[0];
-
-loop:
- ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
-
- ref_objectid = btrfs_ref_objectid(leaf, ref);
-
- if (btrfs_ref_root(leaf, ref) != ref_root ||
- btrfs_ref_generation(leaf, ref) != op->orig_generation ||
- (ref_objectid != op->level &&
- ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) {
- printk(KERN_ERR "btrfs couldn't find %llu, parent %llu, "
- "root %llu, owner %u\n",
- (unsigned long long)op->bytenr,
- (unsigned long long)op->orig_parent,
- (unsigned long long)ref_root, op->level);
- btrfs_print_leaf(extent_root, leaf);
- BUG();
- }
-
- key.objectid = op->bytenr;
- key.offset = op->parent;
- key.type = BTRFS_EXTENT_REF_KEY;
- ret = btrfs_set_item_key_safe(trans, extent_root, path, &key);
- BUG_ON(ret);
- ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
- btrfs_set_ref_generation(leaf, ref, op->generation);
-
- cur = cur->next;
-
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
-
- if (cur == update_list) {
- btrfs_mark_buffer_dirty(path->nodes[0]);
- btrfs_release_path(extent_root, path);
- goto out;
- }
-
- op = list_entry(cur, struct pending_extent_op, list);
-
- path->slots[0]++;
- while (path->slots[0] < btrfs_header_nritems(leaf)) {
- btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
- if (key.objectid == op->bytenr &&
- key.type == BTRFS_EXTENT_REF_KEY)
- goto loop;
- path->slots[0]++;
- }
-
- btrfs_mark_buffer_dirty(path->nodes[0]);
- btrfs_release_path(extent_root, path);
- goto search;
-
-out:
- return 0;
-}
-
-static noinline int insert_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct btrfs_path *path,
- struct list_head *insert_list, int nr)
-{
- struct btrfs_key *keys;
- u32 *data_size;
- struct pending_extent_op *op;
- struct extent_buffer *leaf;
- struct list_head *cur = insert_list->next;
- struct btrfs_fs_info *info = extent_root->fs_info;
- u64 ref_root = extent_root->root_key.objectid;
- int i = 0, last = 0, ret;
- int total = nr * 2;
-
- if (!nr)
- return 0;
-
- keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS);
- if (!keys)
- return -ENOMEM;
-
- data_size = kzalloc(total * sizeof(u32), GFP_NOFS);
- if (!data_size) {
- kfree(keys);
- return -ENOMEM;
- }
-
- list_for_each_entry(op, insert_list, list) {
- keys[i].objectid = op->bytenr;
- keys[i].offset = op->num_bytes;
- keys[i].type = BTRFS_EXTENT_ITEM_KEY;
- data_size[i] = sizeof(struct btrfs_extent_item);
- i++;
-
- keys[i].objectid = op->bytenr;
- keys[i].offset = op->parent;
- keys[i].type = BTRFS_EXTENT_REF_KEY;
- data_size[i] = sizeof(struct btrfs_extent_ref);
- i++;
- }
-
- op = list_entry(cur, struct pending_extent_op, list);
- i = 0;
- while (i < total) {
- int c;
- ret = btrfs_insert_some_items(trans, extent_root, path,
- keys+i, data_size+i, total-i);
- BUG_ON(ret < 0);
-
- if (last && ret > 1)
- BUG();
-
- leaf = path->nodes[0];
- for (c = 0; c < ret; c++) {
- int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY;
-
- /*
- * if the first item we inserted was a backref, then
- * the EXTENT_ITEM will be the odd c's, else it will
- * be the even c's
- */
- if ((ref_first && (c % 2)) ||
- (!ref_first && !(c % 2))) {
- struct btrfs_extent_item *itm;
-
- itm = btrfs_item_ptr(leaf, path->slots[0] + c,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(path->nodes[0], itm, 1);
- op->del++;
- } else {
- struct btrfs_extent_ref *ref;
-
- ref = btrfs_item_ptr(leaf, path->slots[0] + c,
- struct btrfs_extent_ref);
- btrfs_set_ref_root(leaf, ref, ref_root);
- btrfs_set_ref_generation(leaf, ref,
- op->generation);
- btrfs_set_ref_objectid(leaf, ref, op->level);
- btrfs_set_ref_num_refs(leaf, ref, 1);
- op->del++;
- }
-
- /*
- * using del to see when its ok to free up the
- * pending_extent_op. In the case where we insert the
- * last item on the list in order to help do batching
- * we need to not free the extent op until we actually
- * insert the extent_item
- */
- if (op->del == 2) {
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1,
- GFP_NOFS);
- cur = cur->next;
- list_del_init(&op->list);
- kfree(op);
- if (cur != insert_list)
- op = list_entry(cur,
- struct pending_extent_op,
- list);
- }
- }
- btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(extent_root, path);
-
- /*
- * Ok backref's and items usually go right next to eachother,
- * but if we could only insert 1 item that means that we
- * inserted on the end of a leaf, and we have no idea what may
- * be on the next leaf so we just play it safe. In order to
- * try and help this case we insert the last thing on our
- * insert list so hopefully it will end up being the last
- * thing on the leaf and everything else will be before it,
- * which will let us insert a whole bunch of items at the same
- * time.
- */
- if (ret == 1 && !last && (i + ret < total)) {
- /*
- * last: where we will pick up the next time around
- * i: our current key to insert, will be total - 1
- * cur: the current op we are screwing with
- * op: duh
- */
- last = i + ret;
- i = total - 1;
- cur = insert_list->prev;
- op = list_entry(cur, struct pending_extent_op, list);
- } else if (last) {
- /*
- * ok we successfully inserted the last item on the
- * list, lets reset everything
- *
- * i: our current key to insert, so where we left off
- * last time
- * last: done with this
- * cur: the op we are messing with
- * op: duh
- * total: since we inserted the last key, we need to
- * decrement total so we dont overflow
- */
- i = last;
- last = 0;
- total--;
- if (i < total) {
- cur = insert_list->next;
- op = list_entry(cur, struct pending_extent_op,
- list);
- }
- } else {
- i += ret;
- }
-
- cond_resched();
- }
- ret = 0;
- kfree(keys);
- kfree(data_size);
- return ret;
-}
-
static noinline int insert_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr, u64 parent,
u64 ref_root, u64 ref_generation,
- u64 owner_objectid)
+ u64 owner_objectid,
+ int refs_to_add)
{
struct btrfs_key key;
struct extent_buffer *leaf;
btrfs_set_ref_root(leaf, ref, ref_root);
btrfs_set_ref_generation(leaf, ref, ref_generation);
btrfs_set_ref_objectid(leaf, ref, owner_objectid);
- btrfs_set_ref_num_refs(leaf, ref, 1);
+ btrfs_set_ref_num_refs(leaf, ref, refs_to_add);
} else if (ret == -EEXIST) {
u64 existing_owner;
+
BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID);
leaf = path->nodes[0];
ref = btrfs_item_ptr(leaf, path->slots[0],
num_refs = btrfs_ref_num_refs(leaf, ref);
BUG_ON(num_refs == 0);
- btrfs_set_ref_num_refs(leaf, ref, num_refs + 1);
+ btrfs_set_ref_num_refs(leaf, ref, num_refs + refs_to_add);
existing_owner = btrfs_ref_objectid(leaf, ref);
if (existing_owner != owner_objectid &&
} else {
goto out;
}
+ btrfs_unlock_up_safe(path, 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
static noinline int remove_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- struct btrfs_path *path)
+ struct btrfs_path *path,
+ int refs_to_drop)
{
struct extent_buffer *leaf;
struct btrfs_extent_ref *ref;
leaf = path->nodes[0];
ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
num_refs = btrfs_ref_num_refs(leaf, ref);
- BUG_ON(num_refs == 0);
- num_refs -= 1;
+ BUG_ON(num_refs < refs_to_drop);
+ num_refs -= refs_to_drop;
if (num_refs == 0) {
ret = btrfs_del_item(trans, root, path);
} else {
#endif
}
-static noinline int free_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct list_head *del_list)
-{
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct btrfs_path *path;
- struct btrfs_key key, found_key;
- struct extent_buffer *leaf;
- struct list_head *cur;
- struct pending_extent_op *op;
- struct btrfs_extent_item *ei;
- int ret, num_to_del, extent_slot = 0, found_extent = 0;
- u32 refs;
- u64 bytes_freed = 0;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- path->reada = 1;
-
-search:
- /* search for the backref for the current ref we want to delete */
- cur = del_list->next;
- op = list_entry(cur, struct pending_extent_op, list);
- ret = lookup_extent_backref(trans, extent_root, path, op->bytenr,
- op->orig_parent,
- extent_root->root_key.objectid,
- op->orig_generation, op->level, 1);
- if (ret) {
- printk(KERN_ERR "btrfs unable to find backref byte nr %llu "
- "root %llu gen %llu owner %u\n",
- (unsigned long long)op->bytenr,
- (unsigned long long)extent_root->root_key.objectid,
- (unsigned long long)op->orig_generation, op->level);
- btrfs_print_leaf(extent_root, path->nodes[0]);
- WARN_ON(1);
- goto out;
- }
-
- extent_slot = path->slots[0];
- num_to_del = 1;
- found_extent = 0;
-
- /*
- * if we aren't the first item on the leaf we can move back one and see
- * if our ref is right next to our extent item
- */
- if (likely(extent_slot)) {
- extent_slot--;
- btrfs_item_key_to_cpu(path->nodes[0], &found_key,
- extent_slot);
- if (found_key.objectid == op->bytenr &&
- found_key.type == BTRFS_EXTENT_ITEM_KEY &&
- found_key.offset == op->num_bytes) {
- num_to_del++;
- found_extent = 1;
- }
- }
-
- /*
- * if we didn't find the extent we need to delete the backref and then
- * search for the extent item key so we can update its ref count
- */
- if (!found_extent) {
- key.objectid = op->bytenr;
- key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = op->num_bytes;
-
- ret = remove_extent_backref(trans, extent_root, path);
- BUG_ON(ret);
- btrfs_release_path(extent_root, path);
- ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- BUG_ON(ret);
- extent_slot = path->slots[0];
- }
-
- /* this is where we update the ref count for the extent */
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item);
- refs = btrfs_extent_refs(leaf, ei);
- BUG_ON(refs == 0);
- refs--;
- btrfs_set_extent_refs(leaf, ei, refs);
-
- btrfs_mark_buffer_dirty(leaf);
-
- /*
- * This extent needs deleting. The reason cur_slot is extent_slot +
- * num_to_del is because extent_slot points to the slot where the extent
- * is, and if the backref was not right next to the extent we will be
- * deleting at least 1 item, and will want to start searching at the
- * slot directly next to extent_slot. However if we did find the
- * backref next to the extent item them we will be deleting at least 2
- * items and will want to start searching directly after the ref slot
- */
- if (!refs) {
- struct list_head *pos, *n, *end;
- int cur_slot = extent_slot+num_to_del;
- u64 super_used;
- u64 root_used;
-
- path->slots[0] = extent_slot;
- bytes_freed = op->num_bytes;
-
- mutex_lock(&info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, op->bytenr,
- op->num_bytes, op->level >=
- BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&info->pinned_mutex);
- BUG_ON(ret < 0);
- op->del = ret;
-
- /*
- * we need to see if we can delete multiple things at once, so
- * start looping through the list of extents we are wanting to
- * delete and see if their extent/backref's are right next to
- * eachother and the extents only have 1 ref
- */
- for (pos = cur->next; pos != del_list; pos = pos->next) {
- struct pending_extent_op *tmp;
-
- tmp = list_entry(pos, struct pending_extent_op, list);
-
- /* we only want to delete extent+ref at this stage */
- if (cur_slot >= btrfs_header_nritems(leaf) - 1)
- break;
-
- btrfs_item_key_to_cpu(leaf, &found_key, cur_slot);
- if (found_key.objectid != tmp->bytenr ||
- found_key.type != BTRFS_EXTENT_ITEM_KEY ||
- found_key.offset != tmp->num_bytes)
- break;
-
- /* check to make sure this extent only has one ref */
- ei = btrfs_item_ptr(leaf, cur_slot,
- struct btrfs_extent_item);
- if (btrfs_extent_refs(leaf, ei) != 1)
- break;
-
- btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1);
- if (found_key.objectid != tmp->bytenr ||
- found_key.type != BTRFS_EXTENT_REF_KEY ||
- found_key.offset != tmp->orig_parent)
- break;
-
- /*
- * the ref is right next to the extent, we can set the
- * ref count to 0 since we will delete them both now
- */
- btrfs_set_extent_refs(leaf, ei, 0);
-
- /* pin down the bytes for this extent */
- mutex_lock(&info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, tmp->bytenr,
- tmp->num_bytes, tmp->level >=
- BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&info->pinned_mutex);
- BUG_ON(ret < 0);
-
- /*
- * use the del field to tell if we need to go ahead and
- * free up the extent when we delete the item or not.
- */
- tmp->del = ret;
- bytes_freed += tmp->num_bytes;
-
- num_to_del += 2;
- cur_slot += 2;
- }
- end = pos;
-
- /* update the free space counters */
- spin_lock(&info->delalloc_lock);
- super_used = btrfs_super_bytes_used(&info->super_copy);
- btrfs_set_super_bytes_used(&info->super_copy,
- super_used - bytes_freed);
-
- root_used = btrfs_root_used(&extent_root->root_item);
- btrfs_set_root_used(&extent_root->root_item,
- root_used - bytes_freed);
- spin_unlock(&info->delalloc_lock);
-
- /* delete the items */
- ret = btrfs_del_items(trans, extent_root, path,
- path->slots[0], num_to_del);
- BUG_ON(ret);
-
- /*
- * loop through the extents we deleted and do the cleanup work
- * on them
- */
- for (pos = cur, n = pos->next; pos != end;
- pos = n, n = pos->next) {
- struct pending_extent_op *tmp;
- tmp = list_entry(pos, struct pending_extent_op, list);
-
- /*
- * remember tmp->del tells us wether or not we pinned
- * down the extent
- */
- ret = update_block_group(trans, extent_root,
- tmp->bytenr, tmp->num_bytes, 0,
- tmp->del);
- BUG_ON(ret);
-
- list_del_init(&tmp->list);
- unlock_extent(&info->extent_ins, tmp->bytenr,
- tmp->bytenr + tmp->num_bytes - 1,
- GFP_NOFS);
- kfree(tmp);
- }
- } else if (refs && found_extent) {
- /*
- * the ref and extent were right next to eachother, but the
- * extent still has a ref, so just free the backref and keep
- * going
- */
- ret = remove_extent_backref(trans, extent_root, path);
- BUG_ON(ret);
-
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
- } else {
- /*
- * the extent has multiple refs and the backref we were looking
- * for was not right next to it, so just unlock and go next,
- * we're good to go
- */
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
- }
-
- btrfs_release_path(extent_root, path);
- if (!list_empty(del_list))
- goto search;
-
-out:
- btrfs_free_path(path);
- return ret;
-}
-
static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes,
u64 orig_parent, u64 parent,
u64 orig_root, u64 ref_root,
u64 orig_generation, u64 ref_generation,
u64 owner_objectid)
{
int ret;
- struct btrfs_root *extent_root = root->fs_info->extent_root;
- struct btrfs_path *path;
-
- if (root == root->fs_info->extent_root) {
- struct pending_extent_op *extent_op;
- u64 num_bytes;
-
- BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL);
- num_bytes = btrfs_level_size(root, (int)owner_objectid);
- mutex_lock(&root->fs_info->extent_ins_mutex);
- if (test_range_bit(&root->fs_info->extent_ins, bytenr,
- bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
- u64 priv;
- ret = get_state_private(&root->fs_info->extent_ins,
- bytenr, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
- BUG_ON(extent_op->parent != orig_parent);
- BUG_ON(extent_op->generation != orig_generation);
+ int pin = owner_objectid < BTRFS_FIRST_FREE_OBJECTID;
- extent_op->parent = parent;
- extent_op->generation = ref_generation;
- } else {
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_BACKREF_UPDATE;
- extent_op->bytenr = bytenr;
- extent_op->num_bytes = num_bytes;
- extent_op->parent = parent;
- extent_op->orig_parent = orig_parent;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = orig_generation;
- extent_op->level = (int)owner_objectid;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- set_extent_bits(&root->fs_info->extent_ins,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->extent_ins,
- bytenr, (unsigned long)extent_op);
- }
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- ret = lookup_extent_backref(trans, extent_root, path,
- bytenr, orig_parent, orig_root,
- orig_generation, owner_objectid, 1);
- if (ret)
- goto out;
- ret = remove_extent_backref(trans, extent_root, path);
- if (ret)
- goto out;
- ret = insert_extent_backref(trans, extent_root, path, bytenr,
- parent, ref_root, ref_generation,
- owner_objectid);
+ ret = btrfs_update_delayed_ref(trans, bytenr, num_bytes,
+ orig_parent, parent, orig_root,
+ ref_root, orig_generation,
+ ref_generation, owner_objectid, pin);
BUG_ON(ret);
- finish_current_insert(trans, extent_root, 0);
- del_pending_extents(trans, extent_root, 0);
-out:
- btrfs_free_path(path);
return ret;
}
int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
- u64 orig_parent, u64 parent,
+ u64 num_bytes, u64 orig_parent, u64 parent,
u64 ref_root, u64 ref_generation,
u64 owner_objectid)
{
if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
return 0;
- ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent,
- parent, ref_root, ref_root,
- ref_generation, ref_generation,
- owner_objectid);
+
+ ret = __btrfs_update_extent_ref(trans, root, bytenr, num_bytes,
+ orig_parent, parent, ref_root,
+ ref_root, ref_generation,
+ ref_generation, owner_objectid);
return ret;
}
-
static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes,
u64 orig_parent, u64 parent,
u64 orig_root, u64 ref_root,
u64 orig_generation, u64 ref_generation,
u64 owner_objectid)
+{
+ int ret;
+
+ ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, ref_root,
+ ref_generation, owner_objectid,
+ BTRFS_ADD_DELAYED_REF, 0);
+ BUG_ON(ret);
+ return ret;
+}
+
+static noinline_for_stack int add_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u64 parent, u64 ref_root,
+ u64 ref_generation, u64 owner_objectid,
+ int refs_to_add)
{
struct btrfs_path *path;
int ret;
return -ENOMEM;
path->reada = 1;
+ path->leave_spinning = 1;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = (u64)-1;
+ key.offset = num_bytes;
- ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
- 0, 1);
- if (ret < 0)
+ /* first find the extent item and update its reference count */
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key,
+ path, 0, 1);
+ if (ret < 0) {
+ btrfs_set_path_blocking(path);
return ret;
- BUG_ON(ret == 0 || path->slots[0] == 0);
+ }
- path->slots[0]--;
+ if (ret > 0) {
+ WARN_ON(1);
+ btrfs_free_path(path);
+ return -EIO;
+ }
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY);
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
+
refs = btrfs_extent_refs(l, item);
- btrfs_set_extent_refs(l, item, refs + 1);
+ btrfs_set_extent_refs(l, item, refs + refs_to_add);
+ btrfs_unlock_up_safe(path, 1);
+
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
path->reada = 1;
+ path->leave_spinning = 1;
+
+ /* now insert the actual backref */
ret = insert_extent_backref(trans, root->fs_info->extent_root,
path, bytenr, parent,
ref_root, ref_generation,
- owner_objectid);
+ owner_objectid, refs_to_add);
BUG_ON(ret);
- finish_current_insert(trans, root->fs_info->extent_root, 0);
- del_pending_extents(trans, root->fs_info->extent_root, 0);
-
btrfs_free_path(path);
return 0;
}
if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
return 0;
- ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent,
+
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, parent,
0, ref_root, 0, ref_generation,
owner_objectid);
return ret;
}
-int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- u64 start;
- u64 end;
- int ret;
+static int drop_delayed_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_delayed_ref_node *node)
+{
+ int ret = 0;
+ struct btrfs_delayed_ref *ref = btrfs_delayed_node_to_ref(node);
+
+ BUG_ON(node->ref_mod == 0);
+ ret = __btrfs_free_extent(trans, root, node->bytenr, node->num_bytes,
+ node->parent, ref->root, ref->generation,
+ ref->owner_objectid, ref->pin, node->ref_mod);
+
+ return ret;
+}
+
+/* helper function to actually process a single delayed ref entry */
+static noinline int run_one_delayed_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_delayed_ref_node *node,
+ int insert_reserved)
+{
+ int ret;
+ struct btrfs_delayed_ref *ref;
+
+ if (node->parent == (u64)-1) {
+ struct btrfs_delayed_ref_head *head;
+ /*
+ * we've hit the end of the chain and we were supposed
+ * to insert this extent into the tree. But, it got
+ * deleted before we ever needed to insert it, so all
+ * we have to do is clean up the accounting
+ */
+ if (insert_reserved) {
+ update_reserved_extents(root, node->bytenr,
+ node->num_bytes, 0);
+ }
+ head = btrfs_delayed_node_to_head(node);
+ mutex_unlock(&head->mutex);
+ return 0;
+ }
+
+ ref = btrfs_delayed_node_to_ref(node);
+ if (ref->action == BTRFS_ADD_DELAYED_REF) {
+ if (insert_reserved) {
+ struct btrfs_key ins;
+
+ ins.objectid = node->bytenr;
+ ins.offset = node->num_bytes;
+ ins.type = BTRFS_EXTENT_ITEM_KEY;
+
+ /* record the full extent allocation */
+ ret = __btrfs_alloc_reserved_extent(trans, root,
+ node->parent, ref->root,
+ ref->generation, ref->owner_objectid,
+ &ins, node->ref_mod);
+ update_reserved_extents(root, node->bytenr,
+ node->num_bytes, 0);
+ } else {
+ /* just add one backref */
+ ret = add_extent_ref(trans, root, node->bytenr,
+ node->num_bytes,
+ node->parent, ref->root, ref->generation,
+ ref->owner_objectid, node->ref_mod);
+ }
+ BUG_ON(ret);
+ } else if (ref->action == BTRFS_DROP_DELAYED_REF) {
+ WARN_ON(insert_reserved);
+ ret = drop_delayed_ref(trans, root, node);
+ }
+ return 0;
+}
+
+static noinline struct btrfs_delayed_ref_node *
+select_delayed_ref(struct btrfs_delayed_ref_head *head)
+{
+ struct rb_node *node;
+ struct btrfs_delayed_ref_node *ref;
+ int action = BTRFS_ADD_DELAYED_REF;
+again:
+ /*
+ * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
+ * this prevents ref count from going down to zero when
+ * there still are pending delayed ref.
+ */
+ node = rb_prev(&head->node.rb_node);
+ while (1) {
+ if (!node)
+ break;
+ ref = rb_entry(node, struct btrfs_delayed_ref_node,
+ rb_node);
+ if (ref->bytenr != head->node.bytenr)
+ break;
+ if (btrfs_delayed_node_to_ref(ref)->action == action)
+ return ref;
+ node = rb_prev(node);
+ }
+ if (action == BTRFS_ADD_DELAYED_REF) {
+ action = BTRFS_DROP_DELAYED_REF;
+ goto again;
+ }
+ return NULL;
+}
+
+static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct list_head *cluster)
+{
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_head *locked_ref = NULL;
+ int ret;
+ int count = 0;
+ int must_insert_reserved = 0;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ while (1) {
+ if (!locked_ref) {
+ /* pick a new head ref from the cluster list */
+ if (list_empty(cluster))
+ break;
+
+ locked_ref = list_entry(cluster->next,
+ struct btrfs_delayed_ref_head, cluster);
+
+ /* grab the lock that says we are going to process
+ * all the refs for this head */
+ ret = btrfs_delayed_ref_lock(trans, locked_ref);
+
+ /*
+ * we may have dropped the spin lock to get the head
+ * mutex lock, and that might have given someone else
+ * time to free the head. If that's true, it has been
+ * removed from our list and we can move on.
+ */
+ if (ret == -EAGAIN) {
+ locked_ref = NULL;
+ count++;
+ continue;
+ }
+ }
+
+ /*
+ * record the must insert reserved flag before we
+ * drop the spin lock.
+ */
+ must_insert_reserved = locked_ref->must_insert_reserved;
+ locked_ref->must_insert_reserved = 0;
+
+ /*
+ * locked_ref is the head node, so we have to go one
+ * node back for any delayed ref updates
+ */
+ ref = select_delayed_ref(locked_ref);
+ if (!ref) {
+ /* All delayed refs have been processed, Go ahead
+ * and send the head node to run_one_delayed_ref,
+ * so that any accounting fixes can happen
+ */
+ ref = &locked_ref->node;
+ list_del_init(&locked_ref->cluster);
+ locked_ref = NULL;
+ }
+
+ ref->in_tree = 0;
+ rb_erase(&ref->rb_node, &delayed_refs->root);
+ delayed_refs->num_entries--;
+ spin_unlock(&delayed_refs->lock);
+
+ ret = run_one_delayed_ref(trans, root, ref,
+ must_insert_reserved);
+ BUG_ON(ret);
+ btrfs_put_delayed_ref(ref);
+
+ count++;
+ cond_resched();
+ spin_lock(&delayed_refs->lock);
+ }
+ return count;
+}
+
+/*
+ * this starts processing the delayed reference count updates and
+ * extent insertions we have queued up so far. count can be
+ * 0, which means to process everything in the tree at the start
+ * of the run (but not newly added entries), or it can be some target
+ * number you'd like to process.
+ */
+int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, unsigned long count)
+{
+ struct rb_node *node;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct list_head cluster;
+ int ret;
+ int run_all = count == (unsigned long)-1;
+ int run_most = 0;
+
+ if (root == root->fs_info->extent_root)
+ root = root->fs_info->tree_root;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ INIT_LIST_HEAD(&cluster);
+again:
+ spin_lock(&delayed_refs->lock);
+ if (count == 0) {
+ count = delayed_refs->num_entries * 2;
+ run_most = 1;
+ }
+ while (1) {
+ if (!(run_all || run_most) &&
+ delayed_refs->num_heads_ready < 64)
+ break;
+
+ /*
+ * go find something we can process in the rbtree. We start at
+ * the beginning of the tree, and then build a cluster
+ * of refs to process starting at the first one we are able to
+ * lock
+ */
+ ret = btrfs_find_ref_cluster(trans, &cluster,
+ delayed_refs->run_delayed_start);
+ if (ret)
+ break;
+
+ ret = run_clustered_refs(trans, root, &cluster);
+ BUG_ON(ret < 0);
- while(1) {
- finish_current_insert(trans, root->fs_info->extent_root, 1);
- del_pending_extents(trans, root->fs_info->extent_root, 1);
+ count -= min_t(unsigned long, ret, count);
- /* is there more work to do? */
- ret = find_first_extent_bit(&root->fs_info->pending_del,
- 0, &start, &end, EXTENT_WRITEBACK);
- if (!ret)
- continue;
- ret = find_first_extent_bit(&root->fs_info->extent_ins,
- 0, &start, &end, EXTENT_WRITEBACK);
- if (!ret)
- continue;
- break;
+ if (count == 0)
+ break;
}
- return 0;
-}
-int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
- u64 num_bytes, u32 *refs)
-{
- struct btrfs_path *path;
- int ret;
- struct btrfs_key key;
- struct extent_buffer *l;
- struct btrfs_extent_item *item;
+ if (run_all) {
+ node = rb_first(&delayed_refs->root);
+ if (!node)
+ goto out;
+ count = (unsigned long)-1;
- WARN_ON(num_bytes < root->sectorsize);
- path = btrfs_alloc_path();
- path->reada = 1;
- key.objectid = bytenr;
- key.offset = num_bytes;
- btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
- 0, 0);
- if (ret < 0)
- goto out;
- if (ret != 0) {
- btrfs_print_leaf(root, path->nodes[0]);
- printk(KERN_INFO "btrfs failed to find block number %llu\n",
- (unsigned long long)bytenr);
- BUG();
+ while (node) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node,
+ rb_node);
+ if (btrfs_delayed_ref_is_head(ref)) {
+ struct btrfs_delayed_ref_head *head;
+
+ head = btrfs_delayed_node_to_head(ref);
+ atomic_inc(&ref->refs);
+
+ spin_unlock(&delayed_refs->lock);
+ mutex_lock(&head->mutex);
+ mutex_unlock(&head->mutex);
+
+ btrfs_put_delayed_ref(ref);
+ cond_resched();
+ goto again;
+ }
+ node = rb_next(node);
+ }
+ spin_unlock(&delayed_refs->lock);
+ schedule_timeout(1);
+ goto again;
}
- l = path->nodes[0];
- item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- *refs = btrfs_extent_refs(l, item);
out:
- btrfs_free_path(path);
+ spin_unlock(&delayed_refs->lock);
return 0;
}
int refi = 0;
int slot;
int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
- u64, u64, u64, u64, u64, u64, u64, u64);
+ u64, u64, u64, u64, u64, u64, u64, u64, u64);
ref_root = btrfs_header_owner(buf);
ref_generation = btrfs_header_generation(buf);
if (level == 0) {
btrfs_item_key_to_cpu(buf, &key, slot);
+ fi = btrfs_item_ptr(buf, slot,
+ struct btrfs_file_extent_item);
+
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
+ continue;
ret = process_func(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
- orig_generation, ref_generation,
- key.objectid);
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid);
if (ret) {
faili = slot;
goto fail;
}
} else {
- ret = process_func(trans, root, bytenr,
+ ret = process_func(trans, root, bytenr, buf->len,
orig_buf->start, buf->start,
orig_root, ref_root,
orig_generation, ref_generation,
if (bytenr == 0)
continue;
ret = __btrfs_update_extent_ref(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
- orig_generation, ref_generation,
- key.objectid);
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ orig_buf->start, buf->start,
+ orig_root, ref_root, orig_generation,
+ ref_generation, key.objectid);
if (ret)
goto fail;
} else {
bytenr = btrfs_node_blockptr(buf, slot);
ret = __btrfs_update_extent_ref(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
+ buf->len, orig_buf->start,
+ buf->start, orig_root, ref_root,
orig_generation, ref_generation,
level - 1);
if (ret)
struct btrfs_block_group_cache *cache)
{
int ret;
- int pending_ret;
struct btrfs_root *extent_root = root->fs_info->extent_root;
unsigned long bi;
struct extent_buffer *leaf;
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(extent_root, path);
fail:
- finish_current_insert(trans, extent_root, 0);
- pending_ret = del_pending_extents(trans, extent_root, 0);
if (ret)
return ret;
- if (pending_ret)
- return pending_ret;
return 0;
}
clear_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
}
+ mutex_unlock(&root->fs_info->pinned_mutex);
+
while (num > 0) {
cache = btrfs_lookup_block_group(fs_info, bytenr);
BUG_ON(!cache);
u64 end;
int ret;
- mutex_lock(&root->fs_info->pinned_mutex);
while (1) {
+ mutex_lock(&root->fs_info->pinned_mutex);
ret = find_first_extent_bit(unpin, 0, &start, &end,
EXTENT_DIRTY);
if (ret)
ret = btrfs_discard_extent(root, start, end + 1 - start);
+ /* unlocks the pinned mutex */
btrfs_update_pinned_extents(root, start, end + 1 - start, 0);
clear_extent_dirty(unpin, start, end, GFP_NOFS);
- if (need_resched()) {
- mutex_unlock(&root->fs_info->pinned_mutex);
- cond_resched();
- mutex_lock(&root->fs_info->pinned_mutex);
- }
+ cond_resched();
}
mutex_unlock(&root->fs_info->pinned_mutex);
return ret;
}
-static int finish_current_insert(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all)
-{
- u64 start;
- u64 end;
- u64 priv;
- u64 search = 0;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct btrfs_path *path;
- struct pending_extent_op *extent_op, *tmp;
- struct list_head insert_list, update_list;
- int ret;
- int num_inserts = 0, max_inserts, restart = 0;
-
- path = btrfs_alloc_path();
- INIT_LIST_HEAD(&insert_list);
- INIT_LIST_HEAD(&update_list);
-
- max_inserts = extent_root->leafsize /
- (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) +
- sizeof(struct btrfs_extent_ref) +
- sizeof(struct btrfs_extent_item));
-again:
- mutex_lock(&info->extent_ins_mutex);
- while (1) {
- ret = find_first_extent_bit(&info->extent_ins, search, &start,
- &end, EXTENT_WRITEBACK);
- if (ret) {
- if (restart && !num_inserts &&
- list_empty(&update_list)) {
- restart = 0;
- search = 0;
- continue;
- }
- break;
- }
-
- ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS);
- if (!ret) {
- if (all)
- restart = 1;
- search = end + 1;
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
- }
- continue;
- }
-
- ret = get_state_private(&info->extent_ins, start, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)(unsigned long) priv;
-
- if (extent_op->type == PENDING_EXTENT_INSERT) {
- num_inserts++;
- list_add_tail(&extent_op->list, &insert_list);
- search = end + 1;
- if (num_inserts == max_inserts) {
- restart = 1;
- break;
- }
- } else if (extent_op->type == PENDING_BACKREF_UPDATE) {
- list_add_tail(&extent_op->list, &update_list);
- search = end + 1;
- } else {
- BUG();
- }
- }
-
- /*
- * process the update list, clear the writeback bit for it, and if
- * somebody marked this thing for deletion then just unlock it and be
- * done, the free_extents will handle it
- */
- list_for_each_entry_safe(extent_op, tmp, &update_list, list) {
- clear_extent_bits(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- if (extent_op->del) {
- list_del_init(&extent_op->list);
- unlock_extent(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes
- - 1, GFP_NOFS);
- kfree(extent_op);
- }
- }
- mutex_unlock(&info->extent_ins_mutex);
-
- /*
- * still have things left on the update list, go ahead an update
- * everything
- */
- if (!list_empty(&update_list)) {
- ret = update_backrefs(trans, extent_root, path, &update_list);
- BUG_ON(ret);
-
- /* we may have COW'ed new blocks, so lets start over */
- if (all)
- restart = 1;
- }
-
- /*
- * if no inserts need to be done, but we skipped some extents and we
- * need to make sure everything is cleaned then reset everything and
- * go back to the beginning
- */
- if (!num_inserts && restart) {
- search = 0;
- restart = 0;
- INIT_LIST_HEAD(&update_list);
- INIT_LIST_HEAD(&insert_list);
- goto again;
- } else if (!num_inserts) {
- goto out;
- }
-
- /*
- * process the insert extents list. Again if we are deleting this
- * extent, then just unlock it, pin down the bytes if need be, and be
- * done with it. Saves us from having to actually insert the extent
- * into the tree and then subsequently come along and delete it
- */
- mutex_lock(&info->extent_ins_mutex);
- list_for_each_entry_safe(extent_op, tmp, &insert_list, list) {
- clear_extent_bits(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- if (extent_op->del) {
- u64 used;
- list_del_init(&extent_op->list);
- unlock_extent(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes
- - 1, GFP_NOFS);
-
- mutex_lock(&extent_root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root,
- extent_op->bytenr,
- extent_op->num_bytes, 0);
- mutex_unlock(&extent_root->fs_info->pinned_mutex);
-
- spin_lock(&info->delalloc_lock);
- used = btrfs_super_bytes_used(&info->super_copy);
- btrfs_set_super_bytes_used(&info->super_copy,
- used - extent_op->num_bytes);
- used = btrfs_root_used(&extent_root->root_item);
- btrfs_set_root_used(&extent_root->root_item,
- used - extent_op->num_bytes);
- spin_unlock(&info->delalloc_lock);
-
- ret = update_block_group(trans, extent_root,
- extent_op->bytenr,
- extent_op->num_bytes,
- 0, ret > 0);
- BUG_ON(ret);
- kfree(extent_op);
- num_inserts--;
- }
- }
- mutex_unlock(&info->extent_ins_mutex);
-
- ret = insert_extents(trans, extent_root, path, &insert_list,
- num_inserts);
- BUG_ON(ret);
-
- /*
- * if restart is set for whatever reason we need to go back and start
- * searching through the pending list again.
- *
- * We just inserted some extents, which could have resulted in new
- * blocks being allocated, which would result in new blocks needing
- * updates, so if all is set we _must_ restart to get the updated
- * blocks.
- */
- if (restart || all) {
- INIT_LIST_HEAD(&insert_list);
- INIT_LIST_HEAD(&update_list);
- search = 0;
- restart = 0;
- num_inserts = 0;
- goto again;
- }
-out:
- btrfs_free_path(path);
- return 0;
-}
-
static int pin_down_bytes(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int is_data)
+ struct btrfs_path *path,
+ u64 bytenr, u64 num_bytes, int is_data,
+ struct extent_buffer **must_clean)
{
int err = 0;
struct extent_buffer *buf;
u64 header_transid = btrfs_header_generation(buf);
if (header_owner != BTRFS_TREE_LOG_OBJECTID &&
header_owner != BTRFS_TREE_RELOC_OBJECTID &&
+ header_owner != BTRFS_DATA_RELOC_TREE_OBJECTID &&
header_transid == trans->transid &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
- clean_tree_block(NULL, root, buf);
- btrfs_tree_unlock(buf);
- free_extent_buffer(buf);
+ *must_clean = buf;
return 1;
}
btrfs_tree_unlock(buf);
}
free_extent_buffer(buf);
pinit:
+ btrfs_set_path_blocking(path);
+ mutex_lock(&root->fs_info->pinned_mutex);
+ /* unlocks the pinned mutex */
btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
BUG_ON(err < 0);
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, int pin, int mark_free)
+ u64 owner_objectid, int pin, int mark_free,
+ int refs_to_drop)
{
struct btrfs_path *path;
struct btrfs_key key;
return -ENOMEM;
path->reada = 1;
+ path->leave_spinning = 1;
ret = lookup_extent_backref(trans, extent_root, path,
bytenr, parent, root_objectid,
ref_generation, owner_objectid, 1);
break;
}
if (!found_extent) {
- ret = remove_extent_backref(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path,
+ refs_to_drop);
BUG_ON(ret);
btrfs_release_path(extent_root, path);
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, extent_root,
&key, path, -1, 1);
if (ret) {
btrfs_print_leaf(extent_root, path->nodes[0]);
WARN_ON(1);
printk(KERN_ERR "btrfs unable to find ref byte nr %llu "
- "root %llu gen %llu owner %llu\n",
+ "parent %llu root %llu gen %llu owner %llu\n",
(unsigned long long)bytenr,
+ (unsigned long long)parent,
(unsigned long long)root_objectid,
(unsigned long long)ref_generation,
(unsigned long long)owner_objectid);
ei = btrfs_item_ptr(leaf, extent_slot,
struct btrfs_extent_item);
refs = btrfs_extent_refs(leaf, ei);
- BUG_ON(refs == 0);
- refs -= 1;
- btrfs_set_extent_refs(leaf, ei, refs);
+ /*
+ * we're not allowed to delete the extent item if there
+ * are other delayed ref updates pending
+ */
+
+ BUG_ON(refs < refs_to_drop);
+ refs -= refs_to_drop;
+ btrfs_set_extent_refs(leaf, ei, refs);
btrfs_mark_buffer_dirty(leaf);
- if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
+ if (refs == 0 && found_extent &&
+ path->slots[0] == extent_slot + 1) {
struct btrfs_extent_ref *ref;
ref = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_ref);
- BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1);
+ BUG_ON(btrfs_ref_num_refs(leaf, ref) != refs_to_drop);
/* if the back ref and the extent are next to each other
* they get deleted below in one shot
*/
num_to_del = 2;
} else if (found_extent) {
/* otherwise delete the extent back ref */
- ret = remove_extent_backref(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path,
+ refs_to_drop);
BUG_ON(ret);
/* if refs are 0, we need to setup the path for deletion */
if (refs == 0) {
btrfs_release_path(extent_root, path);
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, extent_root, &key, path,
-1, 1);
BUG_ON(ret);
if (refs == 0) {
u64 super_used;
u64 root_used;
+ struct extent_buffer *must_clean = NULL;
if (pin) {
- mutex_lock(&root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, root, bytenr, num_bytes,
- owner_objectid >= BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&root->fs_info->pinned_mutex);
+ ret = pin_down_bytes(trans, root, path,
+ bytenr, num_bytes,
+ owner_objectid >= BTRFS_FIRST_FREE_OBJECTID,
+ &must_clean);
if (ret > 0)
mark_free = 1;
BUG_ON(ret < 0);
}
+
/* block accounting for super block */
spin_lock(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_root_used(&root->root_item,
root_used - num_bytes);
spin_unlock(&info->delalloc_lock);
+
+ /*
+ * it is going to be very rare for someone to be waiting
+ * on the block we're freeing. del_items might need to
+ * schedule, so rather than get fancy, just force it
+ * to blocking here
+ */
+ if (must_clean)
+ btrfs_set_lock_blocking(must_clean);
+
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
num_to_del);
BUG_ON(ret);
btrfs_release_path(extent_root, path);
+ if (must_clean) {
+ clean_tree_block(NULL, root, must_clean);
+ btrfs_tree_unlock(must_clean);
+ free_extent_buffer(must_clean);
+ }
+
if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
BUG_ON(ret);
+ } else {
+ invalidate_mapping_pages(info->btree_inode->i_mapping,
+ bytenr >> PAGE_CACHE_SHIFT,
+ (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT);
}
ret = update_block_group(trans, root, bytenr, num_bytes, 0,
BUG_ON(ret);
}
btrfs_free_path(path);
- finish_current_insert(trans, extent_root, 0);
return ret;
}
/*
- * find all the blocks marked as pending in the radix tree and remove
- * them from the extent map
+ * remove an extent from the root, returns 0 on success
*/
-static int del_pending_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all)
+static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, int pin,
+ int refs_to_drop)
{
- int ret;
- int err = 0;
- u64 start;
- u64 end;
- u64 priv;
- u64 search = 0;
- int nr = 0, skipped = 0;
- struct extent_io_tree *pending_del;
- struct extent_io_tree *extent_ins;
- struct pending_extent_op *extent_op;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct list_head delete_list;
-
- INIT_LIST_HEAD(&delete_list);
- extent_ins = &extent_root->fs_info->extent_ins;
- pending_del = &extent_root->fs_info->pending_del;
-
-again:
- mutex_lock(&info->extent_ins_mutex);
- while (1) {
- ret = find_first_extent_bit(pending_del, search, &start, &end,
- EXTENT_WRITEBACK);
- if (ret) {
- if (all && skipped && !nr) {
- search = 0;
- skipped = 0;
- continue;
- }
- mutex_unlock(&info->extent_ins_mutex);
- break;
- }
-
- ret = try_lock_extent(extent_ins, start, end, GFP_NOFS);
- if (!ret) {
- search = end+1;
- skipped = 1;
-
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
- }
-
- continue;
- }
- BUG_ON(ret < 0);
-
- ret = get_state_private(pending_del, start, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)(unsigned long)priv;
-
- clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK,
- GFP_NOFS);
- if (!test_range_bit(extent_ins, start, end,
- EXTENT_WRITEBACK, 0)) {
- list_add_tail(&extent_op->list, &delete_list);
- nr++;
- } else {
- kfree(extent_op);
-
- ret = get_state_private(&info->extent_ins, start,
- &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
-
- clear_extent_bits(&info->extent_ins, start, end,
- EXTENT_WRITEBACK, GFP_NOFS);
-
- if (extent_op->type == PENDING_BACKREF_UPDATE) {
- list_add_tail(&extent_op->list, &delete_list);
- search = end + 1;
- nr++;
- continue;
- }
-
- mutex_lock(&extent_root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, start,
- end + 1 - start, 0);
- mutex_unlock(&extent_root->fs_info->pinned_mutex);
-
- ret = update_block_group(trans, extent_root, start,
- end + 1 - start, 0, ret > 0);
-
- unlock_extent(extent_ins, start, end, GFP_NOFS);
- BUG_ON(ret);
- kfree(extent_op);
- }
- if (ret)
- err = ret;
-
- search = end + 1;
-
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
- }
- }
+ WARN_ON(num_bytes < root->sectorsize);
- if (nr) {
- ret = free_extents(trans, extent_root, &delete_list);
- BUG_ON(ret);
- }
+ /*
+ * if metadata always pin
+ * if data pin when any transaction has committed this
+ */
+ if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID ||
+ ref_generation != trans->transid)
+ pin = 1;
- if (all && skipped) {
- INIT_LIST_HEAD(&delete_list);
- search = 0;
- nr = 0;
- goto again;
- }
+ if (ref_generation != trans->transid)
+ pin = 1;
- if (!err)
- finish_current_insert(trans, extent_root, 0);
- return err;
+ return __free_extent(trans, root, bytenr, num_bytes, parent,
+ root_objectid, ref_generation,
+ owner_objectid, pin, pin == 0, refs_to_drop);
}
/*
- * remove an extent from the root, returns 0 on success
+ * when we free an extent, it is possible (and likely) that we free the last
+ * delayed ref for that extent as well. This searches the delayed ref tree for
+ * a given extent, and if there are no other delayed refs to be processed, it
+ * removes it from the tree.
*/
-static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, u64 parent,
- u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, int pin)
+static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr)
{
- struct btrfs_root *extent_root = root->fs_info->extent_root;
- int pending_ret;
+ struct btrfs_delayed_ref_head *head;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct rb_node *node;
int ret;
- WARN_ON(num_bytes < root->sectorsize);
- if (root == extent_root) {
- struct pending_extent_op *extent_op = NULL;
-
- mutex_lock(&root->fs_info->extent_ins_mutex);
- if (test_range_bit(&root->fs_info->extent_ins, bytenr,
- bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
- u64 priv;
- ret = get_state_private(&root->fs_info->extent_ins,
- bytenr, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+ head = btrfs_find_delayed_ref_head(trans, bytenr);
+ if (!head)
+ goto out;
- extent_op->del = 1;
- if (extent_op->type == PENDING_EXTENT_INSERT) {
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
- }
+ node = rb_prev(&head->node.rb_node);
+ if (!node)
+ goto out;
- if (extent_op) {
- ref_generation = extent_op->orig_generation;
- parent = extent_op->orig_parent;
- }
+ ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_EXTENT_DELETE;
- extent_op->bytenr = bytenr;
- extent_op->num_bytes = num_bytes;
- extent_op->parent = parent;
- extent_op->orig_parent = parent;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = ref_generation;
- extent_op->level = (int)owner_objectid;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- set_extent_bits(&root->fs_info->pending_del,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->pending_del,
- bytenr, (unsigned long)extent_op);
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
- /* if metadata always pin */
- if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
- if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
- mutex_lock(&root->fs_info->pinned_mutex);
- btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
- mutex_unlock(&root->fs_info->pinned_mutex);
- update_reserved_extents(root, bytenr, num_bytes, 0);
- return 0;
- }
- pin = 1;
- }
+ /* there are still entries for this ref, we can't drop it */
+ if (ref->bytenr == bytenr)
+ goto out;
- /* if data pin when any transaction has committed this */
- if (ref_generation != trans->transid)
- pin = 1;
+ /*
+ * waiting for the lock here would deadlock. If someone else has it
+ * locked they are already in the process of dropping it anyway
+ */
+ if (!mutex_trylock(&head->mutex))
+ goto out;
- ret = __free_extent(trans, root, bytenr, num_bytes, parent,
- root_objectid, ref_generation,
- owner_objectid, pin, pin == 0);
+ /*
+ * at this point we have a head with no other entries. Go
+ * ahead and process it.
+ */
+ head->node.in_tree = 0;
+ rb_erase(&head->node.rb_node, &delayed_refs->root);
+
+ delayed_refs->num_entries--;
- finish_current_insert(trans, root->fs_info->extent_root, 0);
- pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0);
- return ret ? ret : pending_ret;
+ /*
+ * we don't take a ref on the node because we're removing it from the
+ * tree, so we just steal the ref the tree was holding.
+ */
+ delayed_refs->num_heads--;
+ if (list_empty(&head->cluster))
+ delayed_refs->num_heads_ready--;
+
+ list_del_init(&head->cluster);
+ spin_unlock(&delayed_refs->lock);
+
+ ret = run_one_delayed_ref(trans, root->fs_info->tree_root,
+ &head->node, head->must_insert_reserved);
+ BUG_ON(ret);
+ btrfs_put_delayed_ref(&head->node);
+ return 0;
+out:
+ spin_unlock(&delayed_refs->lock);
+ return 0;
}
int btrfs_free_extent(struct btrfs_trans_handle *trans,
{
int ret;
- ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent,
- root_objectid, ref_generation,
- owner_objectid, pin);
+ /*
+ * tree log blocks never actually go into the extent allocation
+ * tree, just update pinning info and exit early.
+ *
+ * data extents referenced by the tree log do need to have
+ * their reference counts bumped.
+ */
+ if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID &&
+ owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
+ mutex_lock(&root->fs_info->pinned_mutex);
+
+ /* unlocks the pinned mutex */
+ btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
+ update_reserved_extents(root, bytenr, num_bytes, 0);
+ ret = 0;
+ } else {
+ ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent,
+ root_objectid, ref_generation,
+ owner_objectid,
+ BTRFS_DROP_DELAYED_REF, 1);
+ BUG_ON(ret);
+ ret = check_ref_cleanup(trans, root, bytenr);
+ BUG_ON(ret);
+ }
return ret;
}
static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 parent,
u64 root_objectid, u64 ref_generation,
- u64 owner, struct btrfs_key *ins)
+ u64 owner, struct btrfs_key *ins,
+ int ref_mod)
{
int ret;
- int pending_ret;
u64 super_used;
u64 root_used;
u64 num_bytes = ins->offset;
btrfs_set_root_used(&root->root_item, root_used + num_bytes);
spin_unlock(&info->delalloc_lock);
- if (root == extent_root) {
- struct pending_extent_op *extent_op;
-
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_EXTENT_INSERT;
- extent_op->bytenr = ins->objectid;
- extent_op->num_bytes = ins->offset;
- extent_op->parent = parent;
- extent_op->orig_parent = 0;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = 0;
- extent_op->level = (int)owner;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- mutex_lock(&root->fs_info->extent_ins_mutex);
- set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
- ins->objectid + ins->offset - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->extent_ins,
- ins->objectid, (unsigned long)extent_op);
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- goto update_block;
- }
-
memcpy(&keys[0], ins, sizeof(*ins));
keys[1].objectid = ins->objectid;
keys[1].type = BTRFS_EXTENT_REF_KEY;
path = btrfs_alloc_path();
BUG_ON(!path);
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_items(trans, extent_root, path, keys,
sizes, 2);
BUG_ON(ret);
extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
- btrfs_set_extent_refs(path->nodes[0], extent_item, 1);
+ btrfs_set_extent_refs(path->nodes[0], extent_item, ref_mod);
ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
struct btrfs_extent_ref);
btrfs_set_ref_root(path->nodes[0], ref, root_objectid);
btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
btrfs_set_ref_objectid(path->nodes[0], ref, owner);
- btrfs_set_ref_num_refs(path->nodes[0], ref, 1);
+ btrfs_set_ref_num_refs(path->nodes[0], ref, ref_mod);
btrfs_mark_buffer_dirty(path->nodes[0]);
trans->alloc_exclude_start = 0;
trans->alloc_exclude_nr = 0;
btrfs_free_path(path);
- finish_current_insert(trans, extent_root, 0);
- pending_ret = del_pending_extents(trans, extent_root, 0);
if (ret)
goto out;
- if (pending_ret) {
- ret = pending_ret;
- goto out;
- }
-update_block:
ret = update_block_group(trans, root, ins->objectid,
ins->offset, 1, 0);
if (ret) {
if (root_objectid == BTRFS_TREE_LOG_OBJECTID)
return 0;
- ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
- ref_generation, owner, ins);
- update_reserved_extents(root, ins->objectid, ins->offset, 0);
+
+ ret = btrfs_add_delayed_ref(trans, ins->objectid,
+ ins->offset, parent, root_objectid,
+ ref_generation, owner,
+ BTRFS_ADD_DELAYED_EXTENT, 0);
+ BUG_ON(ret);
return ret;
}
BUG_ON(ret);
put_block_group(block_group);
ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
- ref_generation, owner, ins);
+ ref_generation, owner, ins, 1);
return ret;
}
u64 search_end, struct btrfs_key *ins, u64 data)
{
int ret;
-
ret = __btrfs_reserve_extent(trans, root, num_bytes,
min_alloc_size, empty_size, hint_byte,
search_end, ins, data);
BUG_ON(ret);
if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
- ret = __btrfs_alloc_reserved_extent(trans, root, parent,
- root_objectid, ref_generation,
- owner_objectid, ins);
+ ret = btrfs_add_delayed_ref(trans, ins->objectid,
+ ins->offset, parent, root_objectid,
+ ref_generation, owner_objectid,
+ BTRFS_ADD_DELAYED_EXTENT, 0);
BUG_ON(ret);
-
- } else {
- update_reserved_extents(root, ins->objectid, ins->offset, 1);
}
+ update_reserved_extents(root, ins->objectid, ins->offset, 1);
return ret;
}
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
- ret = __btrfs_free_extent(trans, root, disk_bytenr,
+ ret = btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi),
leaf->start, leaf_owner, leaf_generation,
key.objectid, 0);
*/
for (i = 0; i < ref->nritems; i++) {
info = ref->extents + sorted[i].slot;
- ret = __btrfs_free_extent(trans, root, info->bytenr,
+ ret = btrfs_free_extent(trans, root, info->bytenr,
info->num_bytes, ref->bytenr,
ref->owner, ref->generation,
info->objectid, 0);
return 0;
}
-static int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start,
+static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 start,
u64 len, u32 *refs)
{
int ret;
- ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs);
+ ret = btrfs_lookup_extent_ref(trans, root, start, len, refs);
BUG_ON(ret);
#if 0 /* some debugging code in case we see problems here */
* we just decrement it below and don't update any
* of the refs the leaf points to.
*/
- ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
+ ret = drop_snap_lookup_refcount(trans, root, bytenr,
+ blocksize, &refs);
BUG_ON(ret);
if (refs != 1)
continue;
*/
for (i = 0; i < refi; i++) {
bytenr = sorted[i].bytenr;
- ret = __btrfs_free_extent(trans, root, bytenr,
+ ret = btrfs_free_extent(trans, root, bytenr,
blocksize, eb->start,
root_owner, root_gen, 0, 1);
BUG_ON(ret);
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start,
+ ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start,
path->nodes[*level]->len, &refs);
BUG_ON(ret);
if (refs > 1)
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
blocksize = btrfs_level_size(root, *level - 1);
- ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
+ ret = drop_snap_lookup_refcount(trans, root, bytenr,
+ blocksize, &refs);
BUG_ON(ret);
/*
root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
- ret = __btrfs_free_extent(trans, root, bytenr,
+ ret = btrfs_free_extent(trans, root, bytenr,
blocksize, parent->start,
root_owner, root_gen,
*level - 1, 1);
* cleanup and free the reference on the last node
* we processed
*/
- ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
+ ret = btrfs_free_extent(trans, root, bytenr, blocksize,
parent->start, root_owner, root_gen,
*level, 1);
free_extent_buffer(path->nodes[*level]);
struct btrfs_path *path;
int i;
int orig_level;
+ int update_count;
struct btrfs_root_item *root_item = &root->root_item;
WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
}
}
while (1) {
+ unsigned long update;
wret = walk_down_tree(trans, root, path, &level);
if (wret > 0)
break;
break;
if (wret < 0)
ret = wret;
- if (trans->transaction->in_commit) {
+ if (trans->transaction->in_commit ||
+ trans->transaction->delayed_refs.flushing) {
ret = -EAGAIN;
break;
}
atomic_inc(&root->fs_info->throttle_gen);
wake_up(&root->fs_info->transaction_throttle);
+ for (update_count = 0; update_count < 16; update_count++) {
+ update = trans->delayed_ref_updates;
+ trans->delayed_ref_updates = 0;
+ if (update)
+ btrfs_run_delayed_refs(trans, root, update);
+ else
+ break;
+ }
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {
root->root_key.objectid,
trans->transid, key.objectid);
BUG_ON(ret);
+
ret = btrfs_free_extent(trans, root,
bytenr, num_bytes, leaf->start,
btrfs_header_owner(leaf),
ref_path, NULL, NULL);
BUG_ON(ret);
- if (root == root->fs_info->extent_root)
- btrfs_extent_post_op(trans, root);
-
return 0;
}
if (!path)
return -ENOMEM;
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_inode(trans, root, path, objectid);
if (ret)
goto out;
btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
mutex_unlock(&root->fs_info->cleaner_mutex);
+ trans = btrfs_start_transaction(info->tree_root, 1);
+ btrfs_commit_transaction(trans, info->tree_root);
+
while (1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
extent_root = root->fs_info->extent_root;
- root->fs_info->last_trans_new_blockgroup = trans->transid;
+ root->fs_info->last_trans_log_full_commit = trans->transid;
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache)
sizeof(cache->item));
BUG_ON(ret);
- finish_current_insert(trans, extent_root, 0);
- ret = del_pending_extents(trans, extent_root, 0);
- BUG_ON(ret);
set_avail_alloc_bits(extent_root->fs_info, type);
return 0;
int clear_extent_buffer_dirty(struct extent_io_tree *tree,
struct extent_buffer *eb)
{
- int set;
unsigned long i;
unsigned long num_pages;
struct page *page;
- u64 start = eb->start;
- u64 end = start + eb->len - 1;
-
- set = clear_extent_dirty(tree, start, end, GFP_NOFS);
num_pages = num_extent_pages(eb->start, eb->len);
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
- if (!set && !PageDirty(page))
+ if (!PageDirty(page))
continue;
lock_page(page);
else
set_page_private(page, EXTENT_PAGE_PRIVATE);
- /*
- * if we're on the last page or the first page and the
- * block isn't aligned on a page boundary, do extra checks
- * to make sure we don't clean page that is partially dirty
- */
- if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) ||
- ((i == num_pages - 1) &&
- ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) {
- start = (u64)page->index << PAGE_CACHE_SHIFT;
- end = start + PAGE_CACHE_SIZE - 1;
- if (test_range_bit(tree, start, end,
- EXTENT_DIRTY, 0)) {
- unlock_page(page);
- continue;
- }
- }
clear_page_dirty_for_io(page);
spin_lock_irq(&page->mapping->tree_lock);
if (!PageDirty(page)) {
{
unsigned long i;
unsigned long num_pages;
+ int was_dirty = 0;
+ was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
num_pages = num_extent_pages(eb->start, eb->len);
- for (i = 0; i < num_pages; i++) {
- struct page *page = extent_buffer_page(eb, i);
- /* writepage may need to do something special for the
- * first page, we have to make sure page->private is
- * properly set. releasepage may drop page->private
- * on us if the page isn't already dirty.
- */
- lock_page(page);
- if (i == 0) {
- set_page_extent_head(page, eb->len);
- } else if (PagePrivate(page) &&
- page->private != EXTENT_PAGE_PRIVATE) {
- set_page_extent_mapped(page);
- }
+ for (i = 0; i < num_pages; i++)
__set_page_dirty_nobuffers(extent_buffer_page(eb, i));
- set_extent_dirty(tree, page_offset(page),
- page_offset(page) + PAGE_CACHE_SIZE - 1,
- GFP_NOFS);
- unlock_page(page);
- }
- return 0;
+ return was_dirty;
}
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
ret = 0;
goto out;
}
+ if (test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
+ ret = 0;
+ goto out;
+ }
/* at this point we can safely release the extent buffer */
num_pages = num_extent_pages(eb->start, eb->len);
for (i = 0; i < num_pages; i++)
/* these are bit numbers for test/set bit */
#define EXTENT_BUFFER_UPTODATE 0
#define EXTENT_BUFFER_BLOCKING 1
+#define EXTENT_BUFFER_DIRTY 2
/*
* page->private values. Every page that is controlled by the extent
struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_io_tree *tree,
struct extent_buffer *eb);
+int test_extent_buffer_dirty(struct extent_io_tree *tree,
+ struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
file_key.offset = pos;
btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
sizeof(*item));
if (ret < 0)
key.offset = end_byte - 1;
key.type = BTRFS_EXTENT_CSUM_KEY;
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0) {
if (path->slots[0] == 0)
} else {
ins_size = csum_size;
}
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
ins_size);
+ path->leave_spinning = 0;
if (ret < 0)
goto fail_unlock;
if (ret != 0) {
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
btrfs_item_size_nr(leaf, path->slots[0]));
eb_token = NULL;
- cond_resched();
next_sector:
if (!eb_token ||
eb_token = NULL;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
- cond_resched();
if (total_bytes < sums->len) {
btrfs_release_path(root, path);
+ cond_resched();
goto again;
}
out:
btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
btrfs_release_path(root, path);
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, root, path, &ins,
sizeof(*extent));
BUG_ON(ret);
ram_bytes);
btrfs_set_file_extent_type(leaf, extent, found_type);
+ btrfs_unlock_up_safe(path, 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
+ btrfs_set_lock_blocking(path->nodes[0]);
if (disk_bytenr != 0) {
ret = btrfs_update_extent_ref(trans, root,
- disk_bytenr, orig_parent,
+ disk_bytenr,
+ le64_to_cpu(old.disk_num_bytes),
+ orig_parent,
leaf->start,
root->root_key.objectid,
trans->transid, ins.objectid);
BUG_ON(ret);
}
+ path->leave_spinning = 0;
btrfs_release_path(root, path);
if (disk_bytenr != 0)
inode_add_bytes(inode, extent_end - end);
btrfs_set_file_extent_other_encoding(leaf, fi, 0);
if (orig_parent != leaf->start) {
- ret = btrfs_update_extent_ref(trans, root, bytenr,
+ ret = btrfs_update_extent_ref(trans, root, bytenr, num_bytes,
orig_parent, leaf->start,
root->root_key.objectid,
trans->transid, inode->i_ino);
page_cache_release(pinned[1]);
*ppos = pos;
+ /*
+ * we want to make sure fsync finds this change
+ * but we haven't joined a transaction running right now.
+ *
+ * Later on, someone is sure to update the inode and get the
+ * real transid recorded.
+ *
+ * We set last_trans now to the fs_info generation + 1,
+ * this will either be one more than the running transaction
+ * or the generation used for the next transaction if there isn't
+ * one running right now.
+ */
+ BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
+
if (num_written > 0 && will_write) {
struct btrfs_trans_handle *trans;
ret = btrfs_log_dentry_safe(trans, root,
file->f_dentry);
if (ret == 0) {
- btrfs_sync_log(trans, root);
- btrfs_end_transaction(trans, root);
+ ret = btrfs_sync_log(trans, root);
+ if (ret == 0)
+ btrfs_end_transaction(trans, root);
+ else
+ btrfs_commit_transaction(trans, root);
} else {
btrfs_commit_transaction(trans, root);
}
int btrfs_release_file(struct inode *inode, struct file *filp)
{
+ /*
+ * ordered_data_close is set by settattr when we are about to truncate
+ * a file from a non-zero size to a zero size. This tries to
+ * flush down new bytes that may have been written if the
+ * application were using truncate to replace a file in place.
+ */
+ if (BTRFS_I(inode)->ordered_data_close) {
+ BTRFS_I(inode)->ordered_data_close = 0;
+ btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode);
+ if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
+ filemap_flush(inode->i_mapping);
+ }
if (filp->private_data)
btrfs_ioctl_trans_end(filp);
return 0;
if (ret > 0) {
ret = btrfs_commit_transaction(trans, root);
} else {
- btrfs_sync_log(trans, root);
- ret = btrfs_end_transaction(trans, root);
+ ret = btrfs_sync_log(trans, root);
+ if (ret == 0)
+ ret = btrfs_end_transaction(trans, root);
+ else
+ ret = btrfs_commit_transaction(trans, root);
}
mutex_lock(&dentry->d_inode->i_mutex);
out:
if (!path)
return -ENOMEM;
+ path->leave_spinning = 1;
+
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0) {
ret = -ENOENT;
if (!path)
return -ENOMEM;
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, root, path, &key,
ins_len);
if (ret == -EEXIST) {
if (!path)
return -ENOMEM;
+ path->leave_spinning = 1;
btrfs_set_trans_block_group(trans, inode);
key.objectid = inode->i_ino;
cur_size = min_t(unsigned long, compressed_size,
PAGE_CACHE_SIZE);
- kaddr = kmap(cpage);
+ kaddr = kmap_atomic(cpage, KM_USER0);
write_extent_buffer(leaf, kaddr, ptr, cur_size);
- kunmap(cpage);
+ kunmap_atomic(kaddr, KM_USER0);
i++;
ptr += cur_size;
* does the checks required to make sure the data is small enough
* to fit as an inline extent.
*/
-static int cow_file_range_inline(struct btrfs_trans_handle *trans,
+static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *inode, u64 start, u64 end,
size_t compressed_size,
u64 cur_end;
int limit = 10 * 1024 * 1042;
- if (!btrfs_test_opt(root, COMPRESS)) {
- return cow_file_range(inode, locked_page, start, end,
- page_started, nr_written, 1);
- }
-
clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED |
EXTENT_DELALLOC, 1, 0, GFP_NOFS);
while (start < end) {
* If no cow copies or snapshots exist, we write directly to the existing
* blocks on disk
*/
-static int run_delalloc_nocow(struct inode *inode, struct page *locked_page,
+static noinline int run_delalloc_nocow(struct inode *inode,
+ struct page *locked_page,
u64 start, u64 end, int *page_started, int force,
unsigned long *nr_written)
{
unsigned long *nr_written)
{
int ret;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
if (btrfs_test_flag(inode, NODATACOW))
ret = run_delalloc_nocow(inode, locked_page, start, end,
else if (btrfs_test_flag(inode, PREALLOC))
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 0, nr_written);
+ else if (!btrfs_test_opt(root, COMPRESS))
+ ret = cow_file_range(inode, locked_page, start, end,
+ page_started, nr_written, 1);
else
ret = cow_file_range_async(inode, locked_page, start, end,
page_started, nr_written);
-
return ret;
}
path = btrfs_alloc_path();
BUG_ON(!path);
+ path->leave_spinning = 1;
ret = btrfs_drop_extents(trans, root, inode, file_pos,
file_pos + num_bytes, file_pos, &hint);
BUG_ON(ret);
btrfs_set_file_extent_compression(leaf, fi, compression);
btrfs_set_file_extent_encryption(leaf, fi, encryption);
btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding);
+
+ btrfs_unlock_up_safe(path, 1);
+ btrfs_set_lock_blocking(leaf);
+
btrfs_mark_buffer_dirty(leaf);
inode_add_bytes(inode, num_bytes);
root->root_key.objectid,
trans->transid, inode->i_ino, &ins);
BUG_ON(ret);
-
btrfs_free_path(path);
+
return 0;
}
+/*
+ * helper function for btrfs_finish_ordered_io, this
+ * just reads in some of the csum leaves to prime them into ram
+ * before we start the transaction. It limits the amount of btree
+ * reads required while inside the transaction.
+ */
+static noinline void reada_csum(struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_ordered_extent *ordered_extent)
+{
+ struct btrfs_ordered_sum *sum;
+ u64 bytenr;
+
+ sum = list_entry(ordered_extent->list.next, struct btrfs_ordered_sum,
+ list);
+ bytenr = sum->sums[0].bytenr;
+
+ /*
+ * we don't care about the results, the point of this search is
+ * just to get the btree leaves into ram
+ */
+ btrfs_lookup_csum(NULL, root->fs_info->csum_root, path, bytenr, 0);
+}
+
/* as ordered data IO finishes, this gets called so we can finish
* an ordered extent if the range of bytes in the file it covers are
* fully written.
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
- struct btrfs_ordered_extent *ordered_extent;
+ struct btrfs_ordered_extent *ordered_extent = NULL;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+ struct btrfs_path *path;
int compressed = 0;
int ret;
if (!ret)
return 0;
+ /*
+ * before we join the transaction, try to do some of our IO.
+ * This will limit the amount of IO that we have to do with
+ * the transaction running. We're unlikely to need to do any
+ * IO if the file extents are new, the disk_i_size checks
+ * covers the most common case.
+ */
+ if (start < BTRFS_I(inode)->disk_i_size) {
+ path = btrfs_alloc_path();
+ if (path) {
+ ret = btrfs_lookup_file_extent(NULL, root, path,
+ inode->i_ino,
+ start, 0);
+ ordered_extent = btrfs_lookup_ordered_extent(inode,
+ start);
+ if (!list_empty(&ordered_extent->list)) {
+ btrfs_release_path(root, path);
+ reada_csum(root, path, ordered_extent);
+ }
+ btrfs_free_path(path);
+ }
+ }
+
trans = btrfs_join_transaction(root, 1);
- ordered_extent = btrfs_lookup_ordered_extent(inode, start);
+ if (!ordered_extent)
+ ordered_extent = btrfs_lookup_ordered_extent(inode, start);
BUG_ON(!ordered_extent);
if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags))
goto nocow;
path = btrfs_alloc_path();
BUG_ON(!path);
+ path->leave_spinning = 1;
ret = btrfs_lookup_inode(trans, root, path,
&BTRFS_I(inode)->location, 1);
if (ret) {
goto err;
}
+ path->leave_spinning = 1;
di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
name, name_len, -1);
if (IS_ERR(di)) {
ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len,
inode, dir->i_ino);
BUG_ON(ret != 0 && ret != -ENOENT);
- if (ret != -ENOENT)
- BTRFS_I(dir)->log_dirty_trans = trans->transid;
ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len,
dir, index);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, dir);
+
+ btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0);
+
ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
dentry->d_name.name, dentry->d_name.len);
key.type = (u8)-1;
search_again:
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto error;
break;
}
if (found_extent) {
+ btrfs_set_path_blocking(path);
ret = btrfs_free_extent(trans, root, extent_start,
extent_num_bytes,
leaf->start, root_owner,
if (err)
return err;
- if (S_ISREG(inode->i_mode) &&
- attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
- err = btrfs_cont_expand(inode, attr->ia_size);
- if (err)
- return err;
+ if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
+ if (attr->ia_size > inode->i_size) {
+ err = btrfs_cont_expand(inode, attr->ia_size);
+ if (err)
+ return err;
+ } else if (inode->i_size > 0 &&
+ attr->ia_size == 0) {
+
+ /* we're truncating a file that used to have good
+ * data down to zero. Make sure it gets into
+ * the ordered flush list so that any new writes
+ * get down to disk quickly.
+ */
+ BTRFS_I(inode)->ordered_data_close = 1;
+ }
}
err = inode_setattr(inode, attr);
bi->disk_i_size = 0;
bi->flags = 0;
bi->index_cnt = (u64)-1;
- bi->log_dirty_trans = 0;
+ bi->last_unlink_trans = 0;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes);
+ INIT_LIST_HEAD(&BTRFS_I(inode)->ordered_operations);
btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
mutex_init(&BTRFS_I(inode)->extent_mutex);
mutex_init(&BTRFS_I(inode)->log_mutex);
sizes[0] = sizeof(struct btrfs_inode_item);
sizes[1] = name_len + sizeof(*ref);
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
if (ret != 0)
goto fail;
drop_inode = 1;
nr = trans->blocks_used;
+
+ btrfs_log_new_name(trans, inode, NULL, dentry->d_parent);
btrfs_end_transaction_throttle(trans, root);
fail:
if (drop_inode) {
}
ClearPageChecked(page);
set_page_dirty(page);
+
+ BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
out_unlock:
btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
trans = btrfs_start_transaction(root, 1);
+
+ /*
+ * setattr is responsible for setting the ordered_data_close flag,
+ * but that is only tested during the last file release. That
+ * could happen well after the next commit, leaving a great big
+ * window where new writes may get lost if someone chooses to write
+ * to this file after truncating to zero
+ *
+ * The inode doesn't have any dirty data here, and so if we commit
+ * this is a noop. If someone immediately starts writing to the inode
+ * it is very likely we'll catch some of their writes in this
+ * transaction, and the commit will find this file on the ordered
+ * data list with good things to send down.
+ *
+ * This is a best effort solution, there is still a window where
+ * using truncate to replace the contents of the file will
+ * end up with a zero length file after a crash.
+ */
+ if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close)
+ btrfs_add_ordered_operation(trans, root, inode);
+
btrfs_set_trans_block_group(trans, inode);
btrfs_i_size_write(inode, inode->i_size);
ei->i_acl = BTRFS_ACL_NOT_CACHED;
ei->i_default_acl = BTRFS_ACL_NOT_CACHED;
INIT_LIST_HEAD(&ei->i_orphan);
+ INIT_LIST_HEAD(&ei->ordered_operations);
return &ei->vfs_inode;
}
void btrfs_destroy_inode(struct inode *inode)
{
struct btrfs_ordered_extent *ordered;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+
WARN_ON(!list_empty(&inode->i_dentry));
WARN_ON(inode->i_data.nrpages);
BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED)
posix_acl_release(BTRFS_I(inode)->i_default_acl);
- spin_lock(&BTRFS_I(inode)->root->list_lock);
+ /*
+ * Make sure we're properly removed from the ordered operation
+ * lists.
+ */
+ smp_mb();
+ if (!list_empty(&BTRFS_I(inode)->ordered_operations)) {
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ list_del_init(&BTRFS_I(inode)->ordered_operations);
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ }
+
+ spin_lock(&root->list_lock);
if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan"
" list\n", inode->i_ino);
dump_stack();
}
- spin_unlock(&BTRFS_I(inode)->root->list_lock);
+ spin_unlock(&root->list_lock);
while (1) {
ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
if (ret)
goto out_unlock;
+ /*
+ * we're using rename to replace one file with another.
+ * and the replacement file is large. Start IO on it now so
+ * we don't add too much work to the end of the transaction
+ */
+ if (new_inode && old_inode && S_ISREG(old_inode->i_mode) &&
+ new_inode->i_size &&
+ old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
+ filemap_flush(old_inode->i_mapping);
+
trans = btrfs_start_transaction(root, 1);
+ /*
+ * make sure the inode gets flushed if it is replacing
+ * something.
+ */
+ if (new_inode && new_inode->i_size &&
+ old_inode && S_ISREG(old_inode->i_mode)) {
+ btrfs_add_ordered_operation(trans, root, old_inode);
+ }
+
+ /*
+ * this is an ugly little race, but the rename is required to make
+ * sure that if we crash, the inode is either at the old name
+ * or the new one. pinning the log transaction lets us make sure
+ * we don't allow a log commit to come in after we unlink the
+ * name but before we add the new name back in.
+ */
+ btrfs_pin_log_trans(root);
+
btrfs_set_trans_block_group(trans, new_dir);
btrfs_inc_nlink(old_dentry->d_inode);
new_dir->i_ctime = new_dir->i_mtime = ctime;
old_inode->i_ctime = ctime;
+ if (old_dentry->d_parent != new_dentry->d_parent)
+ btrfs_record_unlink_dir(trans, old_dir, old_inode, 1);
+
ret = btrfs_unlink_inode(trans, root, old_dir, old_dentry->d_inode,
old_dentry->d_name.name,
old_dentry->d_name.len);
if (ret)
goto out_fail;
+ btrfs_log_new_name(trans, old_inode, old_dir,
+ new_dentry->d_parent);
out_fail:
+
+ /* this btrfs_end_log_trans just allows the current
+ * log-sub transaction to complete
+ */
+ btrfs_end_log_trans(root);
btrfs_end_transaction_throttle(trans, root);
out_unlock:
return ret;
static int btrfs_spin_on_block(struct extent_buffer *eb)
{
int i;
+
for (i = 0; i < 512; i++) {
- cpu_relax();
if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
return 1;
if (need_resched())
break;
+ cpu_relax();
}
return 0;
}
{
int i;
- spin_nested(eb);
- if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
- return 1;
- spin_unlock(&eb->lock);
-
+ if (btrfs_spin_on_block(eb)) {
+ spin_nested(eb);
+ if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+ return 1;
+ spin_unlock(&eb->lock);
+ }
/* spin for a bit on the BLOCKING flag */
for (i = 0; i < 2; i++) {
+ cpu_relax();
if (!btrfs_spin_on_block(eb))
break;
DEFINE_WAIT(wait);
wait.func = btrfs_wake_function;
+ if (!btrfs_spin_on_block(eb))
+ goto sleep;
+
while(1) {
spin_nested(eb);
* spin for a bit, and if the blocking flag goes away,
* loop around
*/
+ cpu_relax();
if (btrfs_spin_on_block(eb))
continue;
-
+sleep:
prepare_to_wait_exclusive(&eb->lock_wq, &wait,
TASK_UNINTERRUPTIBLE);
spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
list_del_init(&entry->root_extent_list);
+
+ /*
+ * we have no more ordered extents for this inode and
+ * no dirty pages. We can safely remove it from the
+ * list of ordered extents
+ */
+ if (RB_EMPTY_ROOT(&tree->tree) &&
+ !mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY)) {
+ list_del_init(&BTRFS_I(inode)->ordered_operations);
+ }
spin_unlock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
mutex_unlock(&tree->mutex);
return 0;
}
+/*
+ * this is used during transaction commit to write all the inodes
+ * added to the ordered operation list. These files must be fully on
+ * disk before the transaction commits.
+ *
+ * we have two modes here, one is to just start the IO via filemap_flush
+ * and the other is to wait for all the io. When we wait, we have an
+ * extra check to make sure the ordered operation list really is empty
+ * before we return
+ */
+int btrfs_run_ordered_operations(struct btrfs_root *root, int wait)
+{
+ struct btrfs_inode *btrfs_inode;
+ struct inode *inode;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ mutex_lock(&root->fs_info->ordered_operations_mutex);
+ spin_lock(&root->fs_info->ordered_extent_lock);
+again:
+ list_splice_init(&root->fs_info->ordered_operations, &splice);
+
+ while (!list_empty(&splice)) {
+ btrfs_inode = list_entry(splice.next, struct btrfs_inode,
+ ordered_operations);
+
+ inode = &btrfs_inode->vfs_inode;
+
+ list_del_init(&btrfs_inode->ordered_operations);
+
+ /*
+ * the inode may be getting freed (in sys_unlink path).
+ */
+ inode = igrab(inode);
+
+ if (!wait && inode) {
+ list_add_tail(&BTRFS_I(inode)->ordered_operations,
+ &root->fs_info->ordered_operations);
+ }
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ if (inode) {
+ if (wait)
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ else
+ filemap_flush(inode->i_mapping);
+ iput(inode);
+ }
+
+ cond_resched();
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ }
+ if (wait && !list_empty(&root->fs_info->ordered_operations))
+ goto again;
+
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ mutex_unlock(&root->fs_info->ordered_operations_mutex);
+
+ return 0;
+}
+
/*
* Used to start IO or wait for a given ordered extent to finish.
*
return ret;
}
+
+/*
+ * add a given inode to the list of inodes that must be fully on
+ * disk before a transaction commit finishes.
+ *
+ * This basically gives us the ext3 style data=ordered mode, and it is mostly
+ * used to make sure renamed files are fully on disk.
+ *
+ * It is a noop if the inode is already fully on disk.
+ *
+ * If trans is not null, we'll do a friendly check for a transaction that
+ * is already flushing things and force the IO down ourselves.
+ */
+int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ u64 last_mod;
+
+ last_mod = max(BTRFS_I(inode)->generation, BTRFS_I(inode)->last_trans);
+
+ /*
+ * if this file hasn't been changed since the last transaction
+ * commit, we can safely return without doing anything
+ */
+ if (last_mod < root->fs_info->last_trans_committed)
+ return 0;
+
+ /*
+ * the transaction is already committing. Just start the IO and
+ * don't bother with all of this list nonsense
+ */
+ if (trans && root->fs_info->running_transaction->blocked) {
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ return 0;
+ }
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ if (list_empty(&BTRFS_I(inode)->ordered_operations)) {
+ list_add_tail(&BTRFS_I(inode)->ordered_operations,
+ &root->fs_info->ordered_operations);
+ }
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ return 0;
+}
int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end, int sync_mode);
int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
+int btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
+int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode);
#endif
cur_trans->use_count = 1;
cur_trans->commit_done = 0;
cur_trans->start_time = get_seconds();
+
+ cur_trans->delayed_refs.root.rb_node = NULL;
+ cur_trans->delayed_refs.num_entries = 0;
+ cur_trans->delayed_refs.num_heads_ready = 0;
+ cur_trans->delayed_refs.num_heads = 0;
+ cur_trans->delayed_refs.flushing = 0;
+ cur_trans->delayed_refs.run_delayed_start = 0;
+ spin_lock_init(&cur_trans->delayed_refs.lock);
+
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
extent_io_tree_init(&cur_trans->dirty_pages,
h->block_group = 0;
h->alloc_exclude_nr = 0;
h->alloc_exclude_start = 0;
+ h->delayed_ref_updates = 0;
+
root->fs_info->running_transaction->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
return h;
if (!root->fs_info->open_ioctl_trans)
wait_current_trans(root);
mutex_unlock(&root->fs_info->trans_mutex);
-
throttle_on_drops(root);
}
{
struct btrfs_transaction *cur_trans;
struct btrfs_fs_info *info = root->fs_info;
+ int count = 0;
+
+ while (count < 4) {
+ unsigned long cur = trans->delayed_ref_updates;
+ trans->delayed_ref_updates = 0;
+ if (cur &&
+ trans->transaction->delayed_refs.num_heads_ready > 64) {
+ trans->delayed_ref_updates = 0;
+
+ /*
+ * do a full flush if the transaction is trying
+ * to close
+ */
+ if (trans->transaction->delayed_refs.flushing)
+ cur = 0;
+ btrfs_run_delayed_refs(trans, root, cur);
+ } else {
+ break;
+ }
+ count++;
+ }
mutex_lock(&info->trans_mutex);
cur_trans = info->running_transaction;
u64 old_root_bytenr;
struct btrfs_root *tree_root = root->fs_info->tree_root;
- btrfs_extent_post_op(trans, root);
btrfs_write_dirty_block_groups(trans, root);
- btrfs_extent_post_op(trans, root);
+
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
while (1) {
old_root_bytenr = btrfs_root_bytenr(&root->root_item);
btrfs_header_level(root->node));
btrfs_set_root_generation(&root->root_item, trans->transid);
- btrfs_extent_post_op(trans, root);
-
ret = btrfs_update_root(trans, tree_root,
&root->root_key,
&root->root_item);
BUG_ON(ret);
btrfs_write_dirty_block_groups(trans, root);
- btrfs_extent_post_op(trans, root);
+
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
}
return 0;
}
struct btrfs_fs_info *fs_info = root->fs_info;
struct list_head *next;
struct extent_buffer *eb;
+ int ret;
- btrfs_extent_post_op(trans, fs_info->tree_root);
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
eb = btrfs_lock_root_node(fs_info->tree_root);
- btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb, 0);
+ btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
- btrfs_extent_post_op(trans, fs_info->tree_root);
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
while (!list_empty(&fs_info->dirty_cowonly_roots)) {
next = fs_info->dirty_cowonly_roots.next;
root = list_entry(next, struct btrfs_root, dirty_list);
update_cowonly_root(trans, root);
+
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
}
return 0;
}
return 0;
}
+/*
+ * when dropping snapshots, we generate a ton of delayed refs, and it makes
+ * sense not to join the transaction while it is trying to flush the current
+ * queue of delayed refs out.
+ *
+ * This is used by the drop snapshot code only
+ */
+static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
+{
+ DEFINE_WAIT(wait);
+
+ mutex_lock(&info->trans_mutex);
+ while (info->running_transaction &&
+ info->running_transaction->delayed_refs.flushing) {
+ prepare_to_wait(&info->transaction_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&info->trans_mutex);
+ schedule();
+ mutex_lock(&info->trans_mutex);
+ finish_wait(&info->transaction_wait, &wait);
+ }
+ mutex_unlock(&info->trans_mutex);
+ return 0;
+}
+
/*
* Given a list of roots that need to be deleted, call btrfs_drop_snapshot on
* all of them
atomic_inc(&root->fs_info->throttles);
while (1) {
+ /*
+ * we don't want to jump in and create a bunch of
+ * delayed refs if the transaction is starting to close
+ */
+ wait_transaction_pre_flush(tree_root->fs_info);
trans = btrfs_start_transaction(tree_root, 1);
+
+ /*
+ * we've joined a transaction, make sure it isn't
+ * closing right now
+ */
+ if (trans->transaction->delayed_refs.flushing) {
+ btrfs_end_transaction(trans, tree_root);
+ continue;
+ }
+
mutex_lock(&root->fs_info->drop_mutex);
ret = btrfs_drop_snapshot(trans, dirty->root);
if (ret != -EAGAIN)
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
old = btrfs_lock_root_node(root);
- btrfs_cow_block(trans, root, old, NULL, 0, &old, 0);
+ btrfs_cow_block(trans, root, old, NULL, 0, &old);
btrfs_copy_root(trans, root, old, &tmp, objectid);
btrfs_tree_unlock(old);
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
int ret;
+ int should_grow = 0;
+ unsigned long now = get_seconds();
+
+ btrfs_run_ordered_operations(root, 0);
+
+ /* make a pass through all the delayed refs we have so far
+ * any runnings procs may add more while we are here
+ */
+ ret = btrfs_run_delayed_refs(trans, root, 0);
+ BUG_ON(ret);
+
+ cur_trans = trans->transaction;
+ /*
+ * set the flushing flag so procs in this transaction have to
+ * start sending their work down.
+ */
+ cur_trans->delayed_refs.flushing = 1;
+
+ ret = btrfs_run_delayed_refs(trans, root, 0);
+ BUG_ON(ret);
- INIT_LIST_HEAD(&dirty_fs_roots);
mutex_lock(&root->fs_info->trans_mutex);
- if (trans->transaction->in_commit) {
- cur_trans = trans->transaction;
- trans->transaction->use_count++;
+ INIT_LIST_HEAD(&dirty_fs_roots);
+ if (cur_trans->in_commit) {
+ cur_trans->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
btrfs_end_transaction(trans, root);
trans->transaction->in_commit = 1;
trans->transaction->blocked = 1;
- cur_trans = trans->transaction;
if (cur_trans->list.prev != &root->fs_info->trans_list) {
prev_trans = list_entry(cur_trans->list.prev,
struct btrfs_transaction, list);
}
}
+ if (now < cur_trans->start_time || now - cur_trans->start_time < 1)
+ should_grow = 1;
+
do {
int snap_pending = 0;
joined = cur_trans->num_joined;
if (cur_trans->num_writers > 1)
timeout = MAX_SCHEDULE_TIMEOUT;
- else
+ else if (should_grow)
timeout = 1;
mutex_unlock(&root->fs_info->trans_mutex);
BUG_ON(ret);
}
- schedule_timeout(timeout);
+ /*
+ * rename don't use btrfs_join_transaction, so, once we
+ * set the transaction to blocked above, we aren't going
+ * to get any new ordered operations. We can safely run
+ * it here and no for sure that nothing new will be added
+ * to the list
+ */
+ btrfs_run_ordered_operations(root, 1);
+
+ smp_mb();
+ if (cur_trans->num_writers > 1 || should_grow)
+ schedule_timeout(timeout);
mutex_lock(&root->fs_info->trans_mutex);
finish_wait(&cur_trans->writer_wait, &wait);
} while (cur_trans->num_writers > 1 ||
- (cur_trans->num_joined != joined));
+ (should_grow && cur_trans->num_joined != joined));
ret = create_pending_snapshots(trans, root->fs_info);
BUG_ON(ret);
+ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
+ BUG_ON(ret);
+
WARN_ON(cur_trans != trans->transaction);
/* btrfs_commit_tree_roots is responsible for getting the
btrfs_copy_pinned(root, pinned_copy);
trans->transaction->blocked = 0;
+
wake_up(&root->fs_info->transaction_throttle);
wake_up(&root->fs_info->transaction_wait);
mutex_lock(&root->fs_info->trans_mutex);
cur_trans->commit_done = 1;
+
root->fs_info->last_trans_committed = cur_trans->transid;
wake_up(&cur_trans->commit_wait);
#ifndef __BTRFS_TRANSACTION__
#define __BTRFS_TRANSACTION__
#include "btrfs_inode.h"
+#include "delayed-ref.h"
struct btrfs_transaction {
u64 transid;
+ /*
+ * total writers in this transaction, it must be zero before the
+ * transaction can end
+ */
unsigned long num_writers;
+
unsigned long num_joined;
int in_commit;
int use_count;
wait_queue_head_t writer_wait;
wait_queue_head_t commit_wait;
struct list_head pending_snapshots;
+ struct btrfs_delayed_ref_root delayed_refs;
};
struct btrfs_trans_handle {
u64 block_group;
u64 alloc_exclude_start;
u64 alloc_exclude_nr;
+ unsigned long delayed_ref_updates;
};
struct btrfs_pending_snapshot {
}
btrfs_release_path(root, path);
- if (is_extent)
- btrfs_extent_post_op(trans, root);
out:
if (path)
btrfs_free_path(path);
#define LOG_INODE_ALL 0
#define LOG_INODE_EXISTS 1
+/*
+ * directory trouble cases
+ *
+ * 1) on rename or unlink, if the inode being unlinked isn't in the fsync
+ * log, we must force a full commit before doing an fsync of the directory
+ * where the unlink was done.
+ * ---> record transid of last unlink/rename per directory
+ *
+ * mkdir foo/some_dir
+ * normal commit
+ * rename foo/some_dir foo2/some_dir
+ * mkdir foo/some_dir
+ * fsync foo/some_dir/some_file
+ *
+ * The fsync above will unlink the original some_dir without recording
+ * it in its new location (foo2). After a crash, some_dir will be gone
+ * unless the fsync of some_file forces a full commit
+ *
+ * 2) we must log any new names for any file or dir that is in the fsync
+ * log. ---> check inode while renaming/linking.
+ *
+ * 2a) we must log any new names for any file or dir during rename
+ * when the directory they are being removed from was logged.
+ * ---> check inode and old parent dir during rename
+ *
+ * 2a is actually the more important variant. With the extra logging
+ * a crash might unlink the old name without recreating the new one
+ *
+ * 3) after a crash, we must go through any directories with a link count
+ * of zero and redo the rm -rf
+ *
+ * mkdir f1/foo
+ * normal commit
+ * rm -rf f1/foo
+ * fsync(f1)
+ *
+ * The directory f1 was fully removed from the FS, but fsync was never
+ * called on f1, only its parent dir. After a crash the rm -rf must
+ * be replayed. This must be able to recurse down the entire
+ * directory tree. The inode link count fixup code takes care of the
+ * ugly details.
+ */
+
/*
* stages for the tree walking. The first
* stage (0) is to only pin down the blocks we find
#define LOG_WALK_REPLAY_INODES 1
#define LOG_WALK_REPLAY_ALL 2
-static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
+static int btrfs_log_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
int inode_only);
static int link_to_fixup_dir(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 objectid);
+static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_root *log,
+ struct btrfs_path *path,
+ u64 dirid, int del_all);
/*
* tree logging is a special write ahead log used to make sure that
return ret;
}
+/*
+ * This either makes the current running log transaction wait
+ * until you call btrfs_end_log_trans() or it makes any future
+ * log transactions wait until you call btrfs_end_log_trans()
+ */
+int btrfs_pin_log_trans(struct btrfs_root *root)
+{
+ int ret = -ENOENT;
+
+ mutex_lock(&root->log_mutex);
+ atomic_inc(&root->log_writers);
+ mutex_unlock(&root->log_mutex);
+ return ret;
+}
+
/*
* indicate we're done making changes to the log tree
* and wake up anyone waiting to do a sync
*/
-static int end_log_trans(struct btrfs_root *root)
+int btrfs_end_log_trans(struct btrfs_root *root)
{
if (atomic_dec_and_test(&root->log_writers)) {
smp_mb();
mutex_lock(&log->fs_info->pinned_mutex);
btrfs_update_pinned_extents(log->fs_info->extent_root,
eb->start, eb->len, 1);
- mutex_unlock(&log->fs_info->pinned_mutex);
}
if (btrfs_buffer_uptodate(eb, gen)) {
ret = link_to_fixup_dir(trans, root, path, location.objectid);
BUG_ON(ret);
+
ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
BUG_ON(ret);
kfree(name);
victim_name_len)) {
btrfs_inc_nlink(inode);
btrfs_release_path(root, path);
+
ret = btrfs_unlink_inode(trans, root, dir,
inode, victim_name,
victim_name_len);
key.offset--;
btrfs_release_path(root, path);
}
- btrfs_free_path(path);
+ btrfs_release_path(root, path);
if (nlink != inode->i_nlink) {
inode->i_nlink = nlink;
btrfs_update_inode(trans, root, inode);
}
BTRFS_I(inode)->index_cnt = (u64)-1;
+ if (inode->i_nlink == 0 && S_ISDIR(inode->i_mode)) {
+ ret = replay_dir_deletes(trans, root, NULL, path,
+ inode->i_ino, 1);
+ BUG_ON(ret);
+ }
+ btrfs_free_path(path);
+
return 0;
}
iput(inode);
- if (key.offset == 0)
- break;
- key.offset--;
+ /*
+ * fixup on a directory may create new entries,
+ * make sure we always look for the highset possible
+ * offset
+ */
+ key.offset = (u64)-1;
}
btrfs_release_path(root, path);
return 0;
read_extent_buffer(eb, name, (unsigned long)(di + 1),
name_len);
log_di = NULL;
- if (dir_key->type == BTRFS_DIR_ITEM_KEY) {
+ if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) {
log_di = btrfs_lookup_dir_item(trans, log, log_path,
dir_key->objectid,
name, name_len, 0);
- } else if (dir_key->type == BTRFS_DIR_INDEX_KEY) {
+ } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) {
log_di = btrfs_lookup_dir_index_item(trans, log,
log_path,
dir_key->objectid,
struct btrfs_root *root,
struct btrfs_root *log,
struct btrfs_path *path,
- u64 dirid)
+ u64 dirid, int del_all)
{
u64 range_start;
u64 range_end;
range_start = 0;
range_end = 0;
while (1) {
- ret = find_dir_range(log, path, dirid, key_type,
- &range_start, &range_end);
- if (ret != 0)
- break;
+ if (del_all)
+ range_end = (u64)-1;
+ else {
+ ret = find_dir_range(log, path, dirid, key_type,
+ &range_start, &range_end);
+ if (ret != 0)
+ break;
+ }
dir_key.offset = range_start;
while (1) {
break;
ret = check_item_in_log(trans, root, log, path,
- log_path, dir, &found_key);
+ log_path, dir,
+ &found_key);
BUG_ON(ret);
if (found_key.offset == (u64)-1)
break;
mode = btrfs_inode_mode(eb, inode_item);
if (S_ISDIR(mode)) {
ret = replay_dir_deletes(wc->trans,
- root, log, path, key.objectid);
+ root, log, path, key.objectid, 0);
BUG_ON(ret);
}
ret = overwrite_item(wc->trans, root, path,
root, inode, inode->i_size,
BTRFS_EXTENT_DATA_KEY);
BUG_ON(ret);
+
+ /* if the nlink count is zero here, the iput
+ * will free the inode. We bump it to make
+ * sure it doesn't get freed until the link
+ * count fixup is done
+ */
+ if (inode->i_nlink == 0) {
+ btrfs_inc_nlink(inode);
+ btrfs_update_inode(wc->trans,
+ root, inode);
+ }
iput(inode);
}
ret = link_to_fixup_dir(wc->trans, root,
return ret;
}
-static int wait_log_commit(struct btrfs_root *root, unsigned long transid)
+static int wait_log_commit(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, unsigned long transid)
{
DEFINE_WAIT(wait);
int index = transid % 2;
prepare_to_wait(&root->log_commit_wait[index],
&wait, TASK_UNINTERRUPTIBLE);
mutex_unlock(&root->log_mutex);
- if (root->log_transid < transid + 2 &&
+
+ if (root->fs_info->last_trans_log_full_commit !=
+ trans->transid && root->log_transid < transid + 2 &&
atomic_read(&root->log_commit[index]))
schedule();
+
finish_wait(&root->log_commit_wait[index], &wait);
mutex_lock(&root->log_mutex);
} while (root->log_transid < transid + 2 &&
return 0;
}
-static int wait_for_writer(struct btrfs_root *root)
+static int wait_for_writer(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
{
DEFINE_WAIT(wait);
while (atomic_read(&root->log_writers)) {
prepare_to_wait(&root->log_writer_wait,
&wait, TASK_UNINTERRUPTIBLE);
mutex_unlock(&root->log_mutex);
- if (atomic_read(&root->log_writers))
+ if (root->fs_info->last_trans_log_full_commit !=
+ trans->transid && atomic_read(&root->log_writers))
schedule();
mutex_lock(&root->log_mutex);
finish_wait(&root->log_writer_wait, &wait);
/*
* btrfs_sync_log does sends a given tree log down to the disk and
* updates the super blocks to record it. When this call is done,
- * you know that any inodes previously logged are safely on disk
+ * you know that any inodes previously logged are safely on disk only
+ * if it returns 0.
+ *
+ * Any other return value means you need to call btrfs_commit_transaction.
+ * Some of the edge cases for fsyncing directories that have had unlinks
+ * or renames done in the past mean that sometimes the only safe
+ * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN,
+ * that has happened.
*/
int btrfs_sync_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
mutex_lock(&root->log_mutex);
index1 = root->log_transid % 2;
if (atomic_read(&root->log_commit[index1])) {
- wait_log_commit(root, root->log_transid);
+ wait_log_commit(trans, root, root->log_transid);
mutex_unlock(&root->log_mutex);
return 0;
}
/* wait for previous tree log sync to complete */
if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
- wait_log_commit(root, root->log_transid - 1);
+ wait_log_commit(trans, root, root->log_transid - 1);
while (1) {
unsigned long batch = root->log_batch;
mutex_unlock(&root->log_mutex);
schedule_timeout_uninterruptible(1);
mutex_lock(&root->log_mutex);
- wait_for_writer(root);
+
+ wait_for_writer(trans, root);
if (batch == root->log_batch)
break;
}
+ /* bail out if we need to do a full commit */
+ if (root->fs_info->last_trans_log_full_commit == trans->transid) {
+ ret = -EAGAIN;
+ mutex_unlock(&root->log_mutex);
+ goto out;
+ }
+
ret = btrfs_write_and_wait_marked_extents(log, &log->dirty_log_pages);
BUG_ON(ret);
index2 = log_root_tree->log_transid % 2;
if (atomic_read(&log_root_tree->log_commit[index2])) {
- wait_log_commit(log_root_tree, log_root_tree->log_transid);
+ wait_log_commit(trans, log_root_tree,
+ log_root_tree->log_transid);
mutex_unlock(&log_root_tree->log_mutex);
goto out;
}
atomic_set(&log_root_tree->log_commit[index2], 1);
- if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2]))
- wait_log_commit(log_root_tree, log_root_tree->log_transid - 1);
+ if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) {
+ wait_log_commit(trans, log_root_tree,
+ log_root_tree->log_transid - 1);
+ }
+
+ wait_for_writer(trans, log_root_tree);
- wait_for_writer(log_root_tree);
+ /*
+ * now that we've moved on to the tree of log tree roots,
+ * check the full commit flag again
+ */
+ if (root->fs_info->last_trans_log_full_commit == trans->transid) {
+ mutex_unlock(&log_root_tree->log_mutex);
+ ret = -EAGAIN;
+ goto out_wake_log_root;
+ }
ret = btrfs_write_and_wait_marked_extents(log_root_tree,
&log_root_tree->dirty_log_pages);
* in and cause problems either.
*/
write_ctree_super(trans, root->fs_info->tree_root, 2);
+ ret = 0;
+out_wake_log_root:
atomic_set(&log_root_tree->log_commit[index2], 0);
smp_mb();
if (waitqueue_active(&log_root_tree->log_commit_wait[index2]))
return 0;
}
-/* * free all the extents used by the tree log. This should be called
+/*
+ * free all the extents used by the tree log. This should be called
* at commit time of the full transaction
*/
int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root)
btrfs_free_path(path);
mutex_unlock(&BTRFS_I(dir)->log_mutex);
- end_log_trans(root);
+ btrfs_end_log_trans(root);
return 0;
}
ret = btrfs_del_inode_ref(trans, log, name, name_len, inode->i_ino,
dirid, &index);
mutex_unlock(&BTRFS_I(inode)->log_mutex);
- end_log_trans(root);
+ btrfs_end_log_trans(root);
return ret;
}
*
* This handles both files and directories.
*/
-static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
+static int btrfs_log_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
int inode_only)
{
min_key.offset = 0;
max_key.objectid = inode->i_ino;
+
+ /* today the code can only do partial logging of directories */
+ if (!S_ISDIR(inode->i_mode))
+ inode_only = LOG_INODE_ALL;
+
if (inode_only == LOG_INODE_EXISTS || S_ISDIR(inode->i_mode))
max_key.type = BTRFS_XATTR_ITEM_KEY;
else
max_key.type = (u8)-1;
max_key.offset = (u64)-1;
- /*
- * if this inode has already been logged and we're in inode_only
- * mode, we don't want to delete the things that have already
- * been written to the log.
- *
- * But, if the inode has been through an inode_only log,
- * the logged_trans field is not set. This allows us to catch
- * any new names for this inode in the backrefs by logging it
- * again
- */
- if (inode_only == LOG_INODE_EXISTS &&
- BTRFS_I(inode)->logged_trans == trans->transid) {
- btrfs_free_path(path);
- btrfs_free_path(dst_path);
- goto out;
- }
mutex_lock(&BTRFS_I(inode)->log_mutex);
/*
if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) {
btrfs_release_path(root, path);
btrfs_release_path(log, dst_path);
- BTRFS_I(inode)->log_dirty_trans = 0;
ret = log_directory_changes(trans, root, inode, path, dst_path);
BUG_ON(ret);
}
btrfs_free_path(path);
btrfs_free_path(dst_path);
-out:
return 0;
}
-int btrfs_log_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
- int inode_only)
+/*
+ * follow the dentry parent pointers up the chain and see if any
+ * of the directories in it require a full commit before they can
+ * be logged. Returns zero if nothing special needs to be done or 1 if
+ * a full commit is required.
+ */
+static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
+ struct inode *inode,
+ struct dentry *parent,
+ struct super_block *sb,
+ u64 last_committed)
{
- int ret;
+ int ret = 0;
+ struct btrfs_root *root;
- start_log_trans(trans, root);
- ret = __btrfs_log_inode(trans, root, inode, inode_only);
- end_log_trans(root);
+ /*
+ * for regular files, if its inode is already on disk, we don't
+ * have to worry about the parents at all. This is because
+ * we can use the last_unlink_trans field to record renames
+ * and other fun in this file.
+ */
+ if (S_ISREG(inode->i_mode) &&
+ BTRFS_I(inode)->generation <= last_committed &&
+ BTRFS_I(inode)->last_unlink_trans <= last_committed)
+ goto out;
+
+ if (!S_ISDIR(inode->i_mode)) {
+ if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb)
+ goto out;
+ inode = parent->d_inode;
+ }
+
+ while (1) {
+ BTRFS_I(inode)->logged_trans = trans->transid;
+ smp_mb();
+
+ if (BTRFS_I(inode)->last_unlink_trans > last_committed) {
+ root = BTRFS_I(inode)->root;
+
+ /*
+ * make sure any commits to the log are forced
+ * to be full commits
+ */
+ root->fs_info->last_trans_log_full_commit =
+ trans->transid;
+ ret = 1;
+ break;
+ }
+
+ if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb)
+ break;
+
+ if (parent == sb->s_root)
+ break;
+
+ parent = parent->d_parent;
+ inode = parent->d_inode;
+
+ }
+out:
return ret;
}
* only logging is done of any parent directories that are older than
* the last committed transaction
*/
-int btrfs_log_dentry(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct dentry *dentry)
+int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ struct dentry *parent, int exists_only)
{
- int inode_only = LOG_INODE_ALL;
+ int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL;
struct super_block *sb;
- int ret;
+ int ret = 0;
+ u64 last_committed = root->fs_info->last_trans_committed;
+
+ sb = inode->i_sb;
+
+ if (root->fs_info->last_trans_log_full_commit >
+ root->fs_info->last_trans_committed) {
+ ret = 1;
+ goto end_no_trans;
+ }
+
+ ret = check_parent_dirs_for_sync(trans, inode, parent,
+ sb, last_committed);
+ if (ret)
+ goto end_no_trans;
start_log_trans(trans, root);
- sb = dentry->d_inode->i_sb;
- while (1) {
- ret = __btrfs_log_inode(trans, root, dentry->d_inode,
- inode_only);
- BUG_ON(ret);
- inode_only = LOG_INODE_EXISTS;
- dentry = dentry->d_parent;
- if (!dentry || !dentry->d_inode || sb != dentry->d_inode->i_sb)
+ ret = btrfs_log_inode(trans, root, inode, inode_only);
+ BUG_ON(ret);
+
+ /*
+ * for regular files, if its inode is already on disk, we don't
+ * have to worry about the parents at all. This is because
+ * we can use the last_unlink_trans field to record renames
+ * and other fun in this file.
+ */
+ if (S_ISREG(inode->i_mode) &&
+ BTRFS_I(inode)->generation <= last_committed &&
+ BTRFS_I(inode)->last_unlink_trans <= last_committed)
+ goto no_parent;
+
+ inode_only = LOG_INODE_EXISTS;
+ while (1) {
+ if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb)
break;
- if (BTRFS_I(dentry->d_inode)->generation <=
- root->fs_info->last_trans_committed)
+ inode = parent->d_inode;
+ if (BTRFS_I(inode)->generation >
+ root->fs_info->last_trans_committed) {
+ ret = btrfs_log_inode(trans, root, inode, inode_only);
+ BUG_ON(ret);
+ }
+ if (parent == sb->s_root)
break;
+
+ parent = parent->d_parent;
}
- end_log_trans(root);
- return 0;
+no_parent:
+ ret = 0;
+ btrfs_end_log_trans(root);
+end_no_trans:
+ return ret;
}
/*
int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct dentry *dentry)
{
- u64 gen;
- gen = root->fs_info->last_trans_new_blockgroup;
- if (gen > root->fs_info->last_trans_committed)
- return 1;
- else
- return btrfs_log_dentry(trans, root, dentry);
+ return btrfs_log_inode_parent(trans, root, dentry->d_inode,
+ dentry->d_parent, 0);
}
/*
kfree(log_root_tree);
return 0;
}
+
+/*
+ * there are some corner cases where we want to force a full
+ * commit instead of allowing a directory to be logged.
+ *
+ * They revolve around files there were unlinked from the directory, and
+ * this function updates the parent directory so that a full commit is
+ * properly done if it is fsync'd later after the unlinks are done.
+ */
+void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
+ struct inode *dir, struct inode *inode,
+ int for_rename)
+{
+ /*
+ * when we're logging a file, if it hasn't been renamed
+ * or unlinked, and its inode is fully committed on disk,
+ * we don't have to worry about walking up the directory chain
+ * to log its parents.
+ *
+ * So, we use the last_unlink_trans field to put this transid
+ * into the file. When the file is logged we check it and
+ * don't log the parents if the file is fully on disk.
+ */
+ if (S_ISREG(inode->i_mode))
+ BTRFS_I(inode)->last_unlink_trans = trans->transid;
+
+ /*
+ * if this directory was already logged any new
+ * names for this file/dir will get recorded
+ */
+ smp_mb();
+ if (BTRFS_I(dir)->logged_trans == trans->transid)
+ return;
+
+ /*
+ * if the inode we're about to unlink was logged,
+ * the log will be properly updated for any new names
+ */
+ if (BTRFS_I(inode)->logged_trans == trans->transid)
+ return;
+
+ /*
+ * when renaming files across directories, if the directory
+ * there we're unlinking from gets fsync'd later on, there's
+ * no way to find the destination directory later and fsync it
+ * properly. So, we have to be conservative and force commits
+ * so the new name gets discovered.
+ */
+ if (for_rename)
+ goto record;
+
+ /* we can safely do the unlink without any special recording */
+ return;
+
+record:
+ BTRFS_I(dir)->last_unlink_trans = trans->transid;
+}
+
+/*
+ * Call this after adding a new name for a file and it will properly
+ * update the log to reflect the new name.
+ *
+ * It will return zero if all goes well, and it will return 1 if a
+ * full transaction commit is required.
+ */
+int btrfs_log_new_name(struct btrfs_trans_handle *trans,
+ struct inode *inode, struct inode *old_dir,
+ struct dentry *parent)
+{
+ struct btrfs_root * root = BTRFS_I(inode)->root;
+
+ /*
+ * this will force the logging code to walk the dentry chain
+ * up for the file
+ */
+ if (S_ISREG(inode->i_mode))
+ BTRFS_I(inode)->last_unlink_trans = trans->transid;
+
+ /*
+ * if this inode hasn't been logged and directory we're renaming it
+ * from hasn't been logged, we don't need to log it
+ */
+ if (BTRFS_I(inode)->logged_trans <=
+ root->fs_info->last_trans_committed &&
+ (!old_dir || BTRFS_I(old_dir)->logged_trans <=
+ root->fs_info->last_trans_committed))
+ return 0;
+
+ return btrfs_log_inode_parent(trans, root, inode, parent, 1);
+}
+
int btrfs_sync_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
-int btrfs_log_dentry(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct dentry *dentry);
int btrfs_recover_log_trees(struct btrfs_root *tree_root);
int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct dentry *dentry);
-int btrfs_log_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
- int inode_only);
int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,
struct btrfs_root *root,
const char *name, int name_len,
struct inode *inode, u64 dirid);
+int btrfs_join_running_log_trans(struct btrfs_root *root);
+int btrfs_end_log_trans(struct btrfs_root *root);
+int btrfs_pin_log_trans(struct btrfs_root *root);
+int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ struct dentry *parent, int exists_only);
+void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
+ struct inode *dir, struct inode *inode,
+ int for_rename);
+int btrfs_log_new_name(struct btrfs_trans_handle *trans,
+ struct inode *inode, struct inode *old_dir,
+ struct dentry *parent);
#endif
projects / linux-2.6-omap-h63xx.git / commitdiff