#include <linux/module.h>
#include <linux/fs.h>
#include <linux/time.h>
-#include <linux/ext4_jbd2.h>
#include <linux/jbd2.h>
#include <linux/highuid.h>
#include <linux/pagemap.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/falloc.h>
-#include <linux/ext4_fs_extents.h>
#include <asm/uaccess.h>
+#include "ext4_jbd2.h"
+#include "ext4_extents.h"
/*
ix->ei_leaf_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
}
-static handle_t *ext4_ext_journal_restart(handle_t *handle, int needed)
+static int ext4_ext_journal_restart(handle_t *handle, int needed)
{
int err;
if (handle->h_buffer_credits > needed)
- return handle;
- if (!ext4_journal_extend(handle, needed))
- return handle;
- err = ext4_journal_restart(handle, needed);
-
- return handle;
+ return 0;
+ err = ext4_journal_extend(handle, needed);
+ if (err)
+ return err;
+ return ext4_journal_restart(handle, needed);
}
/*
return bg_start + colour + block;
}
+/*
+ * Allocation for a meta data block
+ */
static ext4_fsblk_t
-ext4_ext_new_block(handle_t *handle, struct inode *inode,
+ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
struct ext4_extent *ex, int *err)
{
ext4_fsblk_t goal, newblock;
goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
- newblock = ext4_new_block(handle, inode, goal, err);
+ newblock = ext4_new_meta_block(handle, inode, goal, err);
return newblock;
}
}
#define ext4_ext_check_header(inode, eh, depth) \
- __ext4_ext_check_header(__FUNCTION__, inode, eh, depth)
+ __ext4_ext_check_header(__func__, inode, eh, depth)
#ifdef EXT_DEBUG
static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
alloc = 1;
}
path[0].p_hdr = eh;
+ path[0].p_bh = NULL;
i = depth;
/* walk through the tree */
}
path[ppos].p_depth = i;
- path[ppos].p_hdr = eh;
path[ppos].p_ext = NULL;
path[ppos].p_idx = NULL;
/* find extent */
ext4_ext_binsearch(inode, path + ppos, block);
+ /* if not an empty leaf */
+ if (path[ppos].p_ext)
+ path[ppos].p_block = ext_pblock(path[ppos].p_ext);
ext4_ext_show_path(inode, path);
ix->ei_block = cpu_to_le32(logical);
ext4_idx_store_pblock(ix, ptr);
- curp->p_hdr->eh_entries = cpu_to_le16(le16_to_cpu(curp->p_hdr->eh_entries)+1);
+ le16_add_cpu(&curp->p_hdr->eh_entries, 1);
BUG_ON(le16_to_cpu(curp->p_hdr->eh_entries)
> le16_to_cpu(curp->p_hdr->eh_max));
/* allocate all needed blocks */
ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
for (a = 0; a < depth - at; a++) {
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path,
+ newext, &err);
if (newblock == 0)
goto cleanup;
ablocks[a] = newblock;
}
if (m) {
memmove(ex, path[depth].p_ext-m, sizeof(struct ext4_extent)*m);
- neh->eh_entries = cpu_to_le16(le16_to_cpu(neh->eh_entries)+m);
+ le16_add_cpu(&neh->eh_entries, m);
}
set_buffer_uptodate(bh);
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
goto cleanup;
- path[depth].p_hdr->eh_entries =
- cpu_to_le16(le16_to_cpu(path[depth].p_hdr->eh_entries)-m);
+ le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
err = ext4_ext_dirty(handle, inode, path + depth);
if (err)
goto cleanup;
if (m) {
memmove(++fidx, path[i].p_idx - m,
sizeof(struct ext4_extent_idx) * m);
- neh->eh_entries =
- cpu_to_le16(le16_to_cpu(neh->eh_entries) + m);
+ le16_add_cpu(&neh->eh_entries, m);
}
set_buffer_uptodate(bh);
unlock_buffer(bh);
err = ext4_ext_get_access(handle, inode, path + i);
if (err)
goto cleanup;
- path[i].p_hdr->eh_entries = cpu_to_le16(le16_to_cpu(path[i].p_hdr->eh_entries)-m);
+ le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
err = ext4_ext_dirty(handle, inode, path + i);
if (err)
goto cleanup;
ext4_fsblk_t newblock;
int err = 0;
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
if (newblock == 0)
return err;
/* if we found index with free entry, then use that
* entry: create all needed subtree and add new leaf */
err = ext4_ext_split(handle, inode, path, newext, i);
+ if (err)
+ goto out;
/* refill path */
ext4_ext_drop_refs(path);
* sizeof(struct ext4_extent);
memmove(ex + 1, ex + 2, len);
}
- eh->eh_entries = cpu_to_le16(le16_to_cpu(eh->eh_entries) - 1);
+ le16_add_cpu(&eh->eh_entries, -1);
merge_done = 1;
WARN_ON(eh->eh_entries == 0);
if (!eh->eh_entries)
path[depth].p_ext = nearex;
}
- eh->eh_entries = cpu_to_le16(le16_to_cpu(eh->eh_entries)+1);
+ le16_add_cpu(&eh->eh_entries, 1);
nearex = path[depth].p_ext;
nearex->ee_block = newext->ee_block;
ext4_ext_store_pblock(nearex, ext_pblock(newext));
err = ext4_ext_get_access(handle, inode, path);
if (err)
return err;
- path->p_hdr->eh_entries = cpu_to_le16(le16_to_cpu(path->p_hdr->eh_entries)-1);
+ le16_add_cpu(&path->p_hdr->eh_entries, -1);
err = ext4_ext_dirty(handle, inode, path);
if (err)
return err;
credits += 2 * EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
#endif
- handle = ext4_ext_journal_restart(handle, credits);
- if (IS_ERR(handle)) {
- err = PTR_ERR(handle);
+ err = ext4_ext_journal_restart(handle, credits);
+ if (err)
goto out;
- }
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
if (num == 0) {
/* this extent is removed; mark slot entirely unused */
ext4_ext_store_pblock(ex, 0);
- eh->eh_entries = cpu_to_le16(le16_to_cpu(eh->eh_entries)-1);
+ le16_add_cpu(&eh->eh_entries, -1);
}
ex->ee_block = cpu_to_le32(block);
* We start scanning from right side, freeing all the blocks
* after i_size and walking into the tree depth-wise.
*/
- path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), GFP_KERNEL);
+ path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), GFP_NOFS);
if (path == NULL) {
ext4_journal_stop(handle);
return -ENOMEM;
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- return le16_to_cpu(ex->ee_len);
+ /* zeroed the full extent */
+ return allocated;
}
/* ex1: ee_block to iblock - 1 : uninitialized */
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- return le16_to_cpu(ex->ee_len);
+ /* zeroed the full extent */
+ return allocated;
} else if (err)
goto fix_extent_len;
+ /*
+ * We need to zero out the second half because
+ * an fallocate request can update file size and
+ * converting the second half to initialized extent
+ * implies that we can leak some junk data to user
+ * space.
+ */
+ err = ext4_ext_zeroout(inode, ex3);
+ if (err) {
+ /*
+ * We should actually mark the
+ * second half as uninit and return error
+ * Insert would have changed the extent
+ */
+ depth = ext_depth(inode);
+ ext4_ext_drop_refs(path);
+ path = ext4_ext_find_extent(inode,
+ iblock, path);
+ if (IS_ERR(path)) {
+ err = PTR_ERR(path);
+ return err;
+ }
+ ex = path[depth].p_ext;
+ err = ext4_ext_get_access(handle, inode,
+ path + depth);
+ if (err)
+ return err;
+ ext4_ext_mark_uninitialized(ex);
+ ext4_ext_dirty(handle, inode, path + depth);
+ return err;
+ }
+
+ /* zeroed the second half */
return allocated;
}
ex3 = &newex;
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- return le16_to_cpu(ex->ee_len);
+ /* zeroed the full extent */
+ return allocated;
} else if (err)
goto fix_extent_len;
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- return le16_to_cpu(ex->ee_len);
+ /* zero out the first half */
+ return allocated;
}
}
/*
ex->ee_len = orig_ex.ee_len;
ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
ext4_ext_dirty(handle, inode, path + depth);
- return le16_to_cpu(ex->ee_len);
+ /* zero out the first half */
+ return allocated;
} else if (err)
goto fix_extent_len;
out:
}
if (create == EXT4_CREATE_UNINITIALIZED_EXT)
goto out;
- if (!create)
+ if (!create) {
+ /*
+ * We have blocks reserved already. We
+ * return allocated blocks so that delalloc
+ * won't do block reservation for us. But
+ * the buffer head will be unmapped so that
+ * a read from the block returns 0s.
+ */
+ if (allocated > max_blocks)
+ allocated = max_blocks;
+ /* mark the buffer unwritten */
+ __set_bit(BH_Unwritten, &bh_result->b_state);
goto out2;
+ }
ret = ext4_ext_convert_to_initialized(handle, inode,
path, iblock,
goto out2;
}
- if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
- EXT4_I(inode)->i_disksize = inode->i_size;
-
/* previous routine could use block we allocated */
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
outnew:
+ if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
+ EXT4_I(inode)->i_disksize = inode->i_size;
+
__set_bit(BH_New, &bh_result->b_state);
/* Cache only when it is _not_ an uninitialized extent */
ext4_orphan_del(handle, inode);
up_write(&EXT4_I(inode)->i_data_sem);
+ inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
+ ext4_mark_inode_dirty(handle, inode);
ext4_journal_stop(handle);
}
projects / linux-2.6-omap-h63xx.git / blobdiff