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ext4: avoid resizing to a partial cluster size

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[ Upstream commit 69cb8e9d8c ]

This patch avoids an attempt to resize the filesystem to an
unaligned cluster boundary.  An online resize to a size that is not
integral to cluster size results in the last iteration attempting to
grow the fs by a negative amount, which trips a BUG_ON and leaves the fs
with a corrupted in-memory superblock.

Signed-off-by: Oleg Kiselev <okiselev@amazon.com>
Link: https://lore.kernel.org/r/0E92A0AB-4F16-4F1A-94B7-702CC6504FDE@amazon.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kiselev, Oleg 2022-07-20 04:27:48 +00:00 • committed by Justin Hammond
parent a5643607bd
commit 02b6963510
1 changed files with 10 additions and 0 deletions
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10
fs/ext4/resize.c
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@ -1977,6 +1977,16 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
} }
brelse(bh); brelse(bh);
/*
* For bigalloc, trim the requested size to the nearest cluster
* boundary to avoid creating an unusable filesystem. We do this
* silently, instead of returning an error, to avoid breaking
* callers that blindly resize the filesystem to the full size of
* the underlying block device.
*/
if (ext4_has_feature_bigalloc(sb))
n_blocks_count &= ~((1 << EXT4_CLUSTER_BITS(sb)) - 1);
retry: retry:
o_blocks_count = ext4_blocks_count(es); o_blocks_count = ext4_blocks_count(es);