down_write(&nilfs->ns_sem);
if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
nilfs->ns_mount_state |= NILFS_ERROR_FS;
- nilfs->ns_sbp->s_state |= cpu_to_le16(NILFS_ERROR_FS);
- nilfs_commit_super(sbi);
+ nilfs->ns_sbp[0]->s_state |=
+ cpu_to_le16(NILFS_ERROR_FS);
+ nilfs_commit_super(sbi, 1);
}
up_write(&nilfs->ns_sem);
nilfs_btnode_cache_clear(&ii->i_btnode_cache);
}
-/**
- * nilfs_update_last_segment - change pointer to the latest segment
- * @sbi: nilfs_sb_info
- * @update_cno: flag whether to update checkpoint number.
- *
- * nilfs_update_last_segment() changes information in the super block
- * after a partial segment is written out successfully. The super
- * block is marked dirty. It will be written out at the next VFS sync
- * operations such as sync_supers() and generic_shutdown_super().
- */
-void nilfs_update_last_segment(struct nilfs_sb_info *sbi, int update_cno)
-{
- struct the_nilfs *nilfs = sbi->s_nilfs;
- struct nilfs_super_block *sbp = nilfs->ns_sbp;
-
- /* nilfs->sem must be locked by the caller. */
- spin_lock(&nilfs->ns_last_segment_lock);
- if (update_cno)
- nilfs->ns_last_cno = nilfs->ns_cno++;
- sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
- sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
- sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
- spin_unlock(&nilfs->ns_last_segment_lock);
-
- sbi->s_super->s_dirt = 1; /* must be set if delaying the call of
- nilfs_commit_super() */
-}
-
-static int nilfs_sync_super(struct nilfs_sb_info *sbi)
+static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
int barrier_done = 0;
if (nilfs_test_opt(sbi, BARRIER)) {
- set_buffer_ordered(nilfs->ns_sbh);
+ set_buffer_ordered(nilfs->ns_sbh[0]);
barrier_done = 1;
}
retry:
- set_buffer_dirty(nilfs->ns_sbh);
- err = sync_dirty_buffer(nilfs->ns_sbh);
+ set_buffer_dirty(nilfs->ns_sbh[0]);
+ err = sync_dirty_buffer(nilfs->ns_sbh[0]);
if (err == -EOPNOTSUPP && barrier_done) {
nilfs_warning(sbi->s_super, __func__,
"barrier-based sync failed. "
"disabling barriers\n");
nilfs_clear_opt(sbi, BARRIER);
barrier_done = 0;
- clear_buffer_ordered(nilfs->ns_sbh);
+ clear_buffer_ordered(nilfs->ns_sbh[0]);
goto retry;
}
- if (unlikely(err))
+ if (unlikely(err)) {
printk(KERN_ERR
"NILFS: unable to write superblock (err=%d)\n", err);
- else {
+ if (err == -EIO && nilfs->ns_sbh[1]) {
+ nilfs_fall_back_super_block(nilfs);
+ goto retry;
+ }
+ } else {
+ struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
+
+ /*
+ * The latest segment becomes trailable from the position
+ * written in superblock.
+ */
clear_nilfs_discontinued(nilfs);
- spin_lock(&nilfs->ns_last_segment_lock);
- nilfs->ns_prot_seq = le64_to_cpu(nilfs->ns_sbp->s_last_seq);
- spin_unlock(&nilfs->ns_last_segment_lock);
+
+ /* update GC protection for recent segments */
+ if (nilfs->ns_sbh[1]) {
+ sbp = NULL;
+ if (dupsb) {
+ set_buffer_dirty(nilfs->ns_sbh[1]);
+ if (!sync_dirty_buffer(nilfs->ns_sbh[1]))
+ sbp = nilfs->ns_sbp[1];
+ }
+ }
+ if (sbp) {
+ spin_lock(&nilfs->ns_last_segment_lock);
+ nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
+ spin_unlock(&nilfs->ns_last_segment_lock);
+ }
}
return err;
}
-int nilfs_commit_super(struct nilfs_sb_info *sbi)
+int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
- struct nilfs_super_block *sbp = nilfs->ns_sbp;
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
sector_t nfreeblocks;
+ time_t t;
int err;
/* nilfs->sem must be locked by the caller. */
+ if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) {
+ if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC)
+ nilfs_swap_super_block(nilfs);
+ else {
+ printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
+ sbi->s_super->s_id);
+ return -EIO;
+ }
+ }
err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
if (unlikely(err)) {
printk(KERN_ERR "NILFS: failed to count free blocks\n");
return err;
}
- sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
- sbp->s_wtime = cpu_to_le64(get_seconds());
- sbp->s_sum = 0;
- sbp->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
- (unsigned char *)sbp,
- le16_to_cpu(sbp->s_bytes)));
+ spin_lock(&nilfs->ns_last_segment_lock);
+ sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
+ sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
+ sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
+ spin_unlock(&nilfs->ns_last_segment_lock);
+
+ t = get_seconds();
+ nilfs->ns_sbwtime[0] = t;
+ sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks);
+ sbp[0]->s_wtime = cpu_to_le64(t);
+ sbp[0]->s_sum = 0;
+ sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
+ (unsigned char *)sbp[0],
+ nilfs->ns_sbsize));
+ if (dupsb && sbp[1]) {
+ memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
+ nilfs->ns_sbwtime[1] = t;
+ }
sbi->s_super->s_dirt = 0;
- return nilfs_sync_super(sbi);
+ return nilfs_sync_super(sbi, dupsb);
}
static void nilfs_put_super(struct super_block *sb)
if (!(sb->s_flags & MS_RDONLY)) {
down_write(&nilfs->ns_sem);
- nilfs->ns_sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
- nilfs_commit_super(sbi);
+ nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
+ nilfs_commit_super(sbi, 1);
up_write(&nilfs->ns_sem);
}
* 2. down_write(&nilfs->ns_sem)
*
* Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer
- * of the super block (nilfs->ns_sbp).
+ * of the super block (nilfs->ns_sbp[]).
*
* In most cases, VFS functions call lock_super() before calling these
* methods. So we must be careful not to bring on deadlocks when using
struct the_nilfs *nilfs = sbi->s_nilfs;
down_write(&nilfs->ns_sem);
- if (!(sb->s_flags & MS_RDONLY))
- nilfs_commit_super(sbi);
+ if (!(sb->s_flags & MS_RDONLY)) {
+ struct nilfs_super_block **sbp = nilfs->ns_sbp;
+ u64 t = get_seconds();
+ int dupsb;
+
+ if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] &&
+ t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) {
+ up_write(&nilfs->ns_sem);
+ return;
+ }
+ dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ;
+ nilfs_commit_super(sbi, dupsb);
+ }
sb->s_dirt = 0;
up_write(&nilfs->ns_sem);
}
down_write(&nilfs->ns_sem);
if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
nilfs->ns_mount_state |= NILFS_VALID_FS;
- err = nilfs_commit_super(sbi);
+ err = nilfs_commit_super(sbi, 1);
if (likely(!err))
printk(KERN_INFO "NILFS: recovery complete.\n");
}
static int nilfs_setup_super(struct nilfs_sb_info *sbi)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
- struct nilfs_super_block *sbp = nilfs->ns_sbp;
+ struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count);
int mnt_count = le16_to_cpu(sbp->s_mnt_count);
sbp->s_mnt_count = cpu_to_le16(mnt_count + 1);
sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS);
sbp->s_mtime = cpu_to_le64(get_seconds());
- return nilfs_commit_super(sbi);
+ return nilfs_commit_super(sbi, 1);
}
-struct nilfs_super_block *
-nilfs_load_super_block(struct super_block *sb, struct buffer_head **pbh)
+struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
+ u64 pos, int blocksize,
+ struct buffer_head **pbh)
{
- int blocksize;
- unsigned long offset, sb_index;
-
- /*
- * Adjusting block size
- * Blocksize will be enlarged when it is smaller than hardware
- * sector size.
- * Disk format of superblock does not change.
- */
- blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
- if (!blocksize) {
- printk(KERN_ERR
- "NILFS: unable to set blocksize of superblock\n");
- return NULL;
- }
- sb_index = NILFS_SB_OFFSET_BYTES / blocksize;
- offset = NILFS_SB_OFFSET_BYTES % blocksize;
+ unsigned long long sb_index = pos;
+ unsigned long offset;
+ offset = do_div(sb_index, blocksize);
*pbh = sb_bread(sb, sb_index);
- if (!*pbh) {
- printk(KERN_ERR "NILFS: unable to read superblock\n");
+ if (!*pbh)
return NULL;
- }
return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
}
-struct nilfs_super_block *
-nilfs_reload_super_block(struct super_block *sb, struct buffer_head **pbh,
- int blocksize)
-{
- struct nilfs_super_block *sbp;
- unsigned long offset, sb_index;
- int hw_blocksize = bdev_hardsect_size(sb->s_bdev);
-
- if (blocksize < hw_blocksize) {
- printk(KERN_ERR
- "NILFS: blocksize %d too small for device "
- "(sector-size = %d).\n",
- blocksize, hw_blocksize);
- goto failed_sbh;
- }
- brelse(*pbh);
- sb_set_blocksize(sb, blocksize);
-
- sb_index = NILFS_SB_OFFSET_BYTES / blocksize;
- offset = NILFS_SB_OFFSET_BYTES % blocksize;
-
- *pbh = sb_bread(sb, sb_index);
- if (!*pbh) {
- printk(KERN_ERR
- "NILFS: cannot read superblock on 2nd try.\n");
- goto failed;
- }
-
- sbp = (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
- if (sbp->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
- printk(KERN_ERR
- "NILFS: !? Magic mismatch on 2nd try.\n");
- goto failed_sbh;
- }
- return sbp;
-
- failed_sbh:
- brelse(*pbh);
-
- failed:
- return NULL;
-}
-
int nilfs_store_magic_and_option(struct super_block *sb,
struct nilfs_super_block *sbp,
char *data)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
- /* trying to fill super (1st stage) */
sb->s_magic = le16_to_cpu(sbp->s_magic);
/* FS independent flags */
sb->s_flags |= MS_NOATIME;
#endif
- if (sb->s_magic != NILFS_SUPER_MAGIC) {
- printk("NILFS: Can't find nilfs on dev %s.\n", sb->s_id);
- return -EINVAL;
- }
-
nilfs_set_default_options(sbi, sbp);
sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
- if (!parse_options(data, sb))
- return -EINVAL;
-
- return 0;
+ return !parse_options(data, sb) ? -EINVAL : 0 ;
}
/**
* the RDONLY flag and then mark the partition as valid again.
*/
down_write(&nilfs->ns_sem);
- sbp = nilfs->ns_sbp;
+ sbp = nilfs->ns_sbp[0];
if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) &&
(nilfs->ns_mount_state & NILFS_VALID_FS))
sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
sbp->s_mtime = cpu_to_le64(get_seconds());
- nilfs_commit_super(sbi);
+ nilfs_commit_super(sbi, 1);
up_write(&nilfs->ns_sem);
} else {
/*
projects / linux-2.6-omap-h63xx.git / blobdiff