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f2fs: use EINVAL for superblock with invalid magic

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[ Upstream commit 38fb6d0ea3 ]

The kernel mount_block_root() function expects -EACESS or -EINVAL for a
unmountable filesystem when trying to mount the root with different
filesystem types.

However, in 5.3-rc1 the behavior when F2FS code cannot find valid block
changed to return -EFSCORRUPTED(-EUCLEAN), and this error code makes
mount_block_root() fail when trying to probe F2FS.

When the magic number of the superblock mismatches, it has a high
probability that it's just not a F2FS. In this case return -EINVAL seems
to be a better result, and this return value can make mount_block_root()
probing work again.

Return -EINVAL when the superblock has magic mismatch, -EFSCORRUPTED in
other cases (the magic matches but the superblock cannot be recognized).

Fixes: 10f966bbf5 ("f2fs: use generic EFSBADCRC/EFSCORRUPTED")
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Icenowy Zheng 2019-07-25 11:08:52 +08:00 committed by Greg Kroah-Hartman
parent dd676a61c2
commit f03da34a2f
1 changed files with 18 additions and 18 deletions
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36
fs/f2fs/super.c
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@ -1814,11 +1814,11 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
struct super_block *sb = sbi->sb;
unsigned int blocksize;
if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
if (le32_to_cpu(raw_super->magic) != F2FS_SUPER_MAGIC) {
f2fs_msg(sb, KERN_INFO,
"Magic Mismatch, valid(0x%x) - read(0x%x)",
F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
return 1;
return -EINVAL;
}
/* Currently, support only 4KB page cache size */
@ -1826,7 +1826,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
f2fs_msg(sb, KERN_INFO,
"Invalid page_cache_size (%lu), supports only 4KB\n",
PAGE_SIZE);
return 1;
return -EFSCORRUPTED;
}
/* Currently, support only 4KB block size */
@ -1835,7 +1835,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
f2fs_msg(sb, KERN_INFO,
"Invalid blocksize (%u), supports only 4KB\n",
blocksize);
return 1;
return -EFSCORRUPTED;
}
/* check log blocks per segment */
@ -1843,7 +1843,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
f2fs_msg(sb, KERN_INFO,
"Invalid log blocks per segment (%u)\n",
le32_to_cpu(raw_super->log_blocks_per_seg));
return 1;
return -EFSCORRUPTED;
}
/* Currently, support 512/1024/2048/4096 bytes sector size */
@ -1853,7 +1853,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
F2FS_MIN_LOG_SECTOR_SIZE) {
f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
le32_to_cpu(raw_super->log_sectorsize));
return 1;
return -EFSCORRUPTED;
}
if (le32_to_cpu(raw_super->log_sectors_per_block) +
le32_to_cpu(raw_super->log_sectorsize) !=
@ -1862,7 +1862,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
"Invalid log sectors per block(%u) log sectorsize(%u)",
le32_to_cpu(raw_super->log_sectors_per_block),
le32_to_cpu(raw_super->log_sectorsize));
return 1;
return -EFSCORRUPTED;
}
segment_count = le32_to_cpu(raw_super->segment_count);
@ -1878,7 +1878,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
f2fs_msg(sb, KERN_INFO,
"Invalid segment count (%u)",
segment_count);
return 1;
return -EFSCORRUPTED;
}
if (total_sections > segment_count ||
@ -1887,35 +1887,35 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
f2fs_msg(sb, KERN_INFO,
"Invalid segment/section count (%u, %u x %u)",
segment_count, total_sections, segs_per_sec);
return 1;
return -EFSCORRUPTED;
}
if ((segment_count / segs_per_sec) < total_sections) {
f2fs_msg(sb, KERN_INFO,
"Small segment_count (%u < %u * %u)",
segment_count, segs_per_sec, total_sections);
return 1;
return -EFSCORRUPTED;
}
if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) {
f2fs_msg(sb, KERN_INFO,
"Wrong segment_count / block_count (%u > %llu)",
segment_count, le64_to_cpu(raw_super->block_count));
return 1;
return -EFSCORRUPTED;
}
if (secs_per_zone > total_sections || !secs_per_zone) {
f2fs_msg(sb, KERN_INFO,
"Wrong secs_per_zone / total_sections (%u, %u)",
secs_per_zone, total_sections);
return 1;
return -EFSCORRUPTED;
}
if (le32_to_cpu(raw_super->extension_count) > F2FS_MAX_EXTENSION) {
f2fs_msg(sb, KERN_INFO,
"Corrupted extension count (%u > %u)",
le32_to_cpu(raw_super->extension_count),
F2FS_MAX_EXTENSION);
return 1;
return -EFSCORRUPTED;
}
if (le32_to_cpu(raw_super->cp_payload) >
@ -1924,7 +1924,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
"Insane cp_payload (%u > %u)",
le32_to_cpu(raw_super->cp_payload),
blocks_per_seg - F2FS_CP_PACKS);
return 1;
return -EFSCORRUPTED;
}
/* check reserved ino info */
@ -1936,12 +1936,12 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
le32_to_cpu(raw_super->node_ino),
le32_to_cpu(raw_super->meta_ino),
le32_to_cpu(raw_super->root_ino));
return 1;
return -EFSCORRUPTED;
}
/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
if (sanity_check_area_boundary(sbi, bh))
return 1;
return -EFSCORRUPTED;
return 0;
}
@ -2216,11 +2216,11 @@ static int read_raw_super_block(struct f2fs_sb_info *sbi,
}
/* sanity checking of raw super */
if (sanity_check_raw_super(sbi, bh)) {
err = sanity_check_raw_super(sbi, bh);
if (err) {
f2fs_msg(sb, KERN_ERR,
"Can't find valid F2FS filesystem in %dth superblock",
block + 1);
err = -EFSCORRUPTED;
brelse(bh);
continue;
}