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Fix corruption caused by mmap flushing problems

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1) Make mmap flushes synchronous. Linux may skip flushing dirty pages
   already in writeback unless data-integrity sync is requested.

2) Change zfs_putpage to use TXG_WAIT. Otherwise dirty pages may be
   skipped due to DMU pushing back on TX assign.

3) Add missing mmap flush when doing block cloning.

4) While here, pass errors from putpage to writepage/writepages.

This change fixes corruption edge cases, but unfortunately adds
synchronous ZIL flushes for dirty mmap pages to llseek and bclone
operations. It may be possible to avoid these sync writes later
but would need more tricky refactoring of the writeback code.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Robert Evans <evansr@google.com>
Closes #15933 
Closes #16019
This commit is contained in:
Robert Evans
2024-03-25 17:56:49 -04:00
committed by GitHub
parent c28f94f32e
commit 102b468b5e
3 changed files with 10 additions and 9 deletions
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module/zfs/zfs_vnops.c
+5 -1
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@@ -123,7 +123,7 @@ zfs_holey_common(znode_t *zp, ulong_t cmd, loff_t *off)
/* Flush any mmap()'d data to disk */
if (zn_has_cached_data(zp, 0, file_sz - 1))
zn_flush_cached_data(zp, B_FALSE);
zn_flush_cached_data(zp, B_TRUE);
lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_READER);
error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff);
@@ -1187,6 +1187,10 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
}
}
/* Flush any mmap()'d data to disk */
if (zn_has_cached_data(inzp, inoff, inoff + len - 1))
zn_flush_cached_data(inzp, B_TRUE);
/*
* Maintain predictable lock order.
*/