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BACKPORT: f2fs: sanity check log_blocks_per_seg

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f2fs currently only supports 4KB block size and 2MB segment size.
Sanity check log_blocks_per_seg == 9, i.e. 2MB/4KB = (1 << 9)

Partially
(cherry-picked from commit 9a59b62fd8)

f2fs: do more integrity verification for superblock
    
Do more sanity check for superblock during ->mount.
    
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Bug: 36817013
Change-Id: I0be52e54fba82083068337ceb9f7ad985a87319f
Signed-off-by: Jin Qian <jinqian@google.com>
This commit is contained in:
Jin Qian 2017-04-24 18:20:52 -07:00 committed by Amit Pundir
parent 71e5025eb8
commit d69a900de3
1 changed files with 8 additions and 0 deletions
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8
fs/f2fs/super.c
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@ -947,6 +947,14 @@ static int sanity_check_raw_super(struct super_block *sb,
return 1;
}
/* check log blocks per segment */
if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
f2fs_msg(sb, KERN_INFO,
"Invalid log blocks per segment (%u)\n",
le32_to_cpu(raw_super->log_blocks_per_seg));
return 1;
}
/* Currently, support 512/1024/2048/4096 bytes sector size */
if (le32_to_cpu(raw_super->log_sectorsize) >
F2FS_MAX_LOG_SECTOR_SIZE ||