ext4: Fix data integrity writeout issues in nojournal mode

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Several racing fsyncs on ext4 in nojournal mode could result in some
fsync returning earlier than all metadata buffers were properly
persisted. Also ext4_fsync() in nojournal mode was somewhat inefficient
because it was always writing out the inode regardless whether it was
dirty or not.

Fix these issues by using new .sync_inode_metadata method which makes
sure all inode related metadata is written to disk during any
WB_SYNC_ALL writeback in nojournal mode. This also somewhat simplifies
the nojournal mode fsync handling.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260727104923.3828017-37-jack@suse.cz
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Jan Kara 2026-07-27 12:49:35 +02:00 • committed by Christian Brauner

parent 84af7c3b34

commit c26339e1df

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4 changed files with 72 additions and 54 deletions

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1

fs/ext4/ext4.h

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28

fs/ext4/fsync.c

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98

fs/ext4/inode.c

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7

fs/ext4/super.c

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