On Fri, 15 May 2026 17:18:20 +0800, Li Chen wrote:
> (This RFC v8 series is rebased onto linux-next master as of 2026-05-09,
> commit e98d21c170b0 ("Add linux-next specific files for 20260508"), and
> depends on patch "ext4: fix fast commit wait/wake bit mapping on
> 64-bit" [0]).
>
> Zhang Yi in RFC v3 review pointed out that postponing lockdep assertions only
> masks the issue, and that sleeping in ext4_fc_track_inode() while holding
> i_data_sem can form a real ABBA deadlock if the fast commit writer also needs
> i_data_sem while the inode is in FC_COMMITTING.
>
> [...]
Applied, thanks!
[1/7] ext4: fast commit: snapshot inode state before writing log
commit: e9c6e0b8e096255feb71ec996c77bdfbe9c36e91
[2/7] ext4: lockdep: handle i_data_sem subclassing for special inodes
commit: 7f473f971382d73a58e386afa7efdaac294b89f0
[3/7] ext4: fast commit: avoid waiting for FC_COMMITTING
commit: b3060e96533dc3157fc6d3d45dc19927c566977b
[4/7] ext4: fast commit: avoid self-deadlock in inode snapshotting
commit: 2b9b216628fd9352f9c791701c8990d05736aa90
[5/7] ext4: fast commit: avoid i_data_sem by dropping ext4_map_blocks() in
snapshots
commit: 22d887e06a57261df58404c8dce50c4ef37549ed
[6/7] ext4: fast commit: add lock_updates tracepoint
commit: d2f6e83bbbef31169ea363af4277f5c09c914eda
[7/7] ext4: fast commit: export snapshot stats in fc_info
commit: 56bb0b64f4b198bad5ce674509c10793d471148f
Best regards,
--
Theodore Ts'o <[email protected]>
