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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-12-05 13:56:04 -0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-12-07 14:37:33 -0800 |
| commit | 2040fce83fe17763b07c97c1f691da2bb85e4135 (patch) | |
| tree | 6a66cbd00dbefb98febc214b849b235ec91d0131 /fs/f2fs | |
| parent | f455c8a5f0a24090e99249eb7280012376adec2c (diff) | |
| download | linux-exynos-2040fce83fe17763b07c97c1f691da2bb85e4135.tar.gz linux-exynos-2040fce83fe17763b07c97c1f691da2bb85e4135.tar.bz2 linux-exynos-2040fce83fe17763b07c97c1f691da2bb85e4135.zip | |
f2fs: detect wrong layout
Previous mkfs.f2fs allows small partition inappropriately, so f2fs should detect
that as well.
Refer this in f2fs-tools.
mkfs.f2fs: detect small partition by overprovision ratio and # of segments
Reported-and-Tested-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/segment.h | 2 | ||||
| -rw-r--r-- | fs/f2fs/super.c | 11 |
2 files changed, 13 insertions, 0 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 89ab4301ef02..9d44ce83acb2 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -18,6 +18,8 @@ #define DEF_RECLAIM_PREFREE_SEGMENTS 5 /* 5% over total segments */ #define DEF_MAX_RECLAIM_PREFREE_SEGMENTS 4096 /* 8GB in maximum */ +#define F2FS_MIN_SEGMENTS 9 /* SB + 2 (CP + SIT + NAT) + SSA + MAIN */ + /* L: Logical segment # in volume, R: Relative segment # in main area */ #define GET_L2R_SEGNO(free_i, segno) (segno - free_i->start_segno) #define GET_R2L_SEGNO(free_i, segno) (segno + free_i->start_segno) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 7591d2d7b612..1a526474b332 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1452,6 +1452,7 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi) unsigned int total, fsmeta; struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + unsigned int ovp_segments, reserved_segments; total = le32_to_cpu(raw_super->segment_count); fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); @@ -1463,6 +1464,16 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi) if (unlikely(fsmeta >= total)) return 1; + ovp_segments = le32_to_cpu(ckpt->overprov_segment_count); + reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count); + + if (unlikely(fsmeta < F2FS_MIN_SEGMENTS || + ovp_segments == 0 || reserved_segments == 0)) { + f2fs_msg(sbi->sb, KERN_ERR, + "Wrong layout: check mkfs.f2fs version"); + return 1; + } + if (unlikely(f2fs_cp_error(sbi))) { f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); return 1; |