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ext4: force overhead calculation if the s_overhead_cluster makes no sense

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commit 85d825dbf4 upstream.

If the file system does not use bigalloc, calculating the overhead is
cheap, so force the recalculation of the overhead so we don't have to
trust the precalculated overhead in the superblock.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Theodore Ts'o
2022-04-14 21:57:49 -04:00
committed by Greg Kroah-Hartman
parent 4789149b9e
commit e1e96e3727
1 changed files with 12 additions and 3 deletions
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15
fs/ext4/super.c
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@@ -4933,9 +4933,18 @@ no_journal:
* Get the # of file system overhead blocks from the
* superblock if present.
*/
if (es->s_overhead_clusters)
sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
else {
sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
/* ignore the precalculated value if it is ridiculous */
if (sbi->s_overhead > ext4_blocks_count(es))
sbi->s_overhead = 0;
/*
* If the bigalloc feature is not enabled recalculating the
* overhead doesn't take long, so we might as well just redo
* it to make sure we are using the correct value.
*/
if (!ext4_has_feature_bigalloc(sb))
sbi->s_overhead = 0;
if (sbi->s_overhead == 0) {
err = ext4_calculate_overhead(sb);
if (err)
goto failed_mount_wq;