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f2fs: recovering broken superblock during mount

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This patch recovers a broken superblock with the other valid one.

Signed-off-by: hujianyang <hujianyang@huawei.com>
[Jaegeuk Kim: reinitialize local variables in f2fs_fill_super for retrial]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
hujianyang 2015-05-21 14:42:53 +08:00 committed by Jaegeuk Kim
parent 304eecc346
commit da554e48ca
1 changed files with 52 additions and 13 deletions
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65
fs/f2fs/super.c
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@ -970,29 +970,36 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
*/ */
static int read_raw_super_block(struct super_block *sb, static int read_raw_super_block(struct super_block *sb,
struct f2fs_super_block **raw_super, struct f2fs_super_block **raw_super,
struct buffer_head **raw_super_buf) struct buffer_head **raw_super_buf,
int *recovery)
{ {
int block = 0; int block = 0;
struct buffer_head *buffer;
struct f2fs_super_block *super;
int err = 0;
retry: retry:
*raw_super_buf = sb_bread(sb, block); buffer = sb_bread(sb, block);
if (!*raw_super_buf) { if (!buffer) {
*recovery = 1;
f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock", f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
block + 1); block + 1);
if (block == 0) { if (block == 0) {
block++; block++;
goto retry; goto retry;
} else { } else {
return -EIO; err = -EIO;
goto out;
} }
} }
*raw_super = (struct f2fs_super_block *) super = (struct f2fs_super_block *)
((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET); ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
/* sanity checking of raw super */ /* sanity checking of raw super */
if (sanity_check_raw_super(sb, *raw_super)) { if (sanity_check_raw_super(sb, super)) {
brelse(*raw_super_buf); brelse(buffer);
*recovery = 1;
f2fs_msg(sb, KERN_ERR, f2fs_msg(sb, KERN_ERR,
"Can't find valid F2FS filesystem in %dth superblock", "Can't find valid F2FS filesystem in %dth superblock",
block + 1); block + 1);
@ -1000,10 +1007,30 @@ retry:
block++; block++;
goto retry; goto retry;
} else { } else {
return -EINVAL; err = -EINVAL;
goto out;
} }
} }
if (!*raw_super) {
*raw_super_buf = buffer;
*raw_super = super;
} else {
/* already have a valid superblock */
brelse(buffer);
}
/* check the validity of the second superblock */
if (block == 0) {
block++;
goto retry;
}
out:
/* No valid superblock */
if (!*raw_super)
return err;
return 0; return 0;
} }
@ -1034,15 +1061,20 @@ out:
static int f2fs_fill_super(struct super_block *sb, void *data, int silent) static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{ {
struct f2fs_sb_info *sbi; struct f2fs_sb_info *sbi;
struct f2fs_super_block *raw_super = NULL; struct f2fs_super_block *raw_super;
struct buffer_head *raw_super_buf; struct buffer_head *raw_super_buf;
struct inode *root; struct inode *root;
long err = -EINVAL; long err;
bool retry = true, need_fsck = false; bool retry = true, need_fsck = false;
char *options = NULL; char *options = NULL;
int i; int recovery, i;
try_onemore: try_onemore:
err = -EINVAL;
raw_super = NULL;
raw_super_buf = NULL;
recovery = 0;
/* allocate memory for f2fs-specific super block info */ /* allocate memory for f2fs-specific super block info */
sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
if (!sbi) if (!sbi)
@ -1054,7 +1086,7 @@ try_onemore:
goto free_sbi; goto free_sbi;
} }
err = read_raw_super_block(sb, &raw_super, &raw_super_buf); err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
if (err) if (err)
goto free_sbi; goto free_sbi;
@ -1252,6 +1284,13 @@ try_onemore:
goto free_kobj; goto free_kobj;
} }
kfree(options); kfree(options);
/* recover broken superblock */
if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
f2fs_commit_super(sbi);
}
return 0; return 0;
free_kobj: free_kobj: