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f2fs: when check superblock failed, try to check another superblock 

In f2fs, there are two superblocks. So when the first superblock was
invalidate, it should try to check another.

By Jaegeuk Kim:
 o Remove a white space for coding style
 o Clean up for code readability
 o Fix a typo

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
majianpeng 2013-02-01 19:07:03 +08:00 committed by Jaegeuk Kim
parent 5c9b469295
commit 14d7e9de05
1 changed files with 31 additions and 16 deletions
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47
fs/f2fs/super.c
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@ -387,7 +387,7 @@ static int sanity_check_raw_super(struct super_block *sb,
/* Currently, support only 4KB page cache size */
if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
f2fs_msg(sb, KERN_INFO,
"Invalid page_cache_size (%u), supports only 4KB\n",
"Invalid page_cache_size (%lu), supports only 4KB\n",
PAGE_CACHE_SIZE);
return 1;
}
@ -462,6 +462,32 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
atomic_set(&sbi->nr_pages[i], 0);
}
static int validate_superblock(struct super_block *sb,
struct f2fs_super_block **raw_super,
struct buffer_head **raw_super_buf, sector_t block)
{
const char *super = (block == 0 ? "first" : "second");
/* read f2fs raw super block */
*raw_super_buf = sb_bread(sb, block);
if (!*raw_super_buf) {
f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
super);
return 1;
}
*raw_super = (struct f2fs_super_block *)
((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
/* sanity checking of raw super */
if (!sanity_check_raw_super(sb, *raw_super))
return 0;
f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
"in %s superblock", super);
return 1;
}
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
struct f2fs_sb_info *sbi;
@ -482,16 +508,11 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
goto free_sbi;
}
/* read f2fs raw super block */
raw_super_buf = sb_bread(sb, 0);
if (!raw_super_buf) {
err = -EIO;
f2fs_msg(sb, KERN_ERR, "unable to read superblock");
goto free_sbi;
if (validate_superblock(sb, &raw_super, &raw_super_buf, 0)) {
brelse(raw_super_buf);
if (validate_superblock(sb, &raw_super, &raw_super_buf, 1))
goto free_sb_buf;
}
raw_super = (struct f2fs_super_block *)
((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
/* init some FS parameters */
sbi->active_logs = NR_CURSEG_TYPE;
@ -507,12 +528,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
if (parse_options(sb, sbi, (char *)data))
goto free_sb_buf;
/* sanity checking of raw super */
if (sanity_check_raw_super(sb, raw_super)) {
f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem");
goto free_sb_buf;
}
sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
sb->s_max_links = F2FS_LINK_MAX;
get_random_bytes(&sbi->s_next_generation, sizeof(u32));