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| author |   Theodore Ts'o <tytso@mit.edu> | 2019-01-31 23:41:11 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-01-31 23:41:11 -0500 |
| commit | 8fdd60f2ae3682caf2a7258626abc21eb4711892 (patch) | |
| tree | aeba8ce399b47836c4dc098962d6f711bec3b4af /fs/ext4 | |
| parent | Linux 5.0-rc3 (diff) | |
| download | linux-dev-8fdd60f2ae3682caf2a7258626abc21eb4711892.tar.xz linux-dev-8fdd60f2ae3682caf2a7258626abc21eb4711892.zip | |
Revert "ext4: use ext4_write_inode() when fsyncing w/o a journal"
This reverts commit ad211f3e94b314a910d4af03178a0b52a7d1ee0a.
As Jan Kara pointed out, this change was unsafe since it means we lose
the call to sync_mapping_buffers() in the nojournal case. The
original point of the commit was avoid taking the inode mutex (since
it causes a lockdep warning in generic/113); but we need the mutex in
order to call sync_mapping_buffers().
The real fix to this problem was discussed here:
https://lore.kernel.org/lkml/20181025150540.259281-4-bvanassche@acm.org
The proposed patch was to fix a syzbot complaint, but the problem can
also demonstrated via "kvm-xfstests -c nojournal generic/113".
Multiple solutions were discused in the e-mail thread, but none have
landed in the kernel as of this writing. Anyway, commit
ad211f3e94b314 is absolutely the wrong way to suppress the lockdep, so
revert it.
Fixes: ad211f3e94b314a910d4af03178a0b52a7d1ee0a ("ext4: use ext4_write_inode() when fsyncing w/o a journal")
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/fsync.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c index 712f00995390..5508baa11bb6 100644 --- a/fs/ext4/fsync.c +++ b/fs/ext4/fsync.c @@ -116,16 +116,8 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync) goto out; } - ret = file_write_and_wait_range(file, start, end); - if (ret) - return ret; - if (!journal) { - struct writeback_control wbc = { - .sync_mode = WB_SYNC_ALL - }; - - ret = ext4_write_inode(inode, &wbc); + ret = __generic_file_fsync(file, start, end, datasync); if (!ret) ret = ext4_sync_parent(inode); if (test_opt(inode->i_sb, BARRIER)) @@ -133,6 +125,9 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync) goto out; } + ret = file_write_and_wait_range(file, start, end); + if (ret) + return ret; /* * data=writeback,ordered: * The caller's filemap_fdatawrite()/wait will sync the data. |