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ext4: fix fencepost error in lazytime optimization
authorTheodore Ts'o <tytso@mit.edu>
Thu, 2 Jul 2015 03:37:46 +0000 (23:37 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Thu, 2 Jul 2015 03:37:46 +0000 (23:37 -0400)
commit0f0ff9a9f3fa2ec6f427603fd521d5f3a0b076d1
treed1f2548257683d788811b2375198742935c97015tree | snapshot
parenta2fd66d069d86d793e9d39d4079b96f46d13f237commit | diff
ext4: fix fencepost error in lazytime optimization

Commit 8f4d8558391: "ext4: fix lazytime optimization" was not a
complete fix.  In the case where the inode number is a multiple of 16,
and we could still end up updating an inode with dirty timestamps
written to the wrong inode on disk.  Oops.

This can be easily reproduced by using generic/005 with a file system
with metadata_csum and lazytime enabled.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
fs/ext4/inode.c diff | blob | history
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