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Fix long POSIX_FADV_DONTNEED for single block files

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dbuf_whichblock() is not made to handle offsets beyond the block
end for single-block objects.  Handle it in dmu_evict_range(),
similar to dmu_prefetch_by_dnode().

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18399
Closes #18489
This commit is contained in:
Alexander Motin
2026-05-04 13:22:47 -04:00
committed by Tony Hutter
parent 4bb7592745
commit 38501e1821
2 changed files with 18 additions and 5 deletions
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module/zfs/dmu.c
+8 -2
View File
@@ -918,8 +918,14 @@ dmu_evict_range(objset_t *os, uint64_t object, uint64_t offset, uint64_t len)
* access patterns are rare.
*/
rw_enter(&dn->dn_struct_rwlock, RW_READER);
uint64_t start = dbuf_whichblock(dn, 0, offset);
uint64_t end = dbuf_whichblock(dn, 0, offset + len);
uint64_t start, end;
if (dn->dn_datablkshift != 0) {
start = dbuf_whichblock(dn, 0, offset);
end = dbuf_whichblock(dn, 0, offset + len);
} else {
start = (offset >= dn->dn_datablksz);
end = (offset + len >= dn->dn_datablksz);
}
if (end > start)
dbuf_evict_range(dn, start, end - 1);
rw_exit(&dn->dn_struct_rwlock);
tests/zfs-tests/tests/functional/fadvise/fadvise_dontneed.ksh
+10 -3
View File
@@ -32,11 +32,13 @@
# 2. Record cache_count from dbufstats
# 3. Call file_fadvise with POSIX_FADV_DONTNEED on the file
# 4. Verify that cache_count decreased
# 5. Sanity-check eviction for single-block files.
#
verify_runnable "global"
FILE=$TESTDIR/$TESTFILE0
FILE0=$TESTDIR/$TESTFILE0
FILE1=$TESTDIR/$TESTFILE1
BLKSZ=$(get_prop recordsize $TESTPOOL)
function cleanup
@@ -48,16 +50,21 @@ log_assert "Ensure POSIX_FADV_DONTNEED evicts data from the dbuf cache"
log_onexit cleanup
log_must file_write -o create -f $FILE -b $BLKSZ -c 100
log_must file_write -o create -f $FILE0 -b $BLKSZ -c 100
sync_pool $TESTPOOL
evicts1=$(kstat dbufstats.cache_count)
log_must file_fadvise -f $FILE -a POSIX_FADV_DONTNEED
log_must file_fadvise -f $FILE0 -a POSIX_FADV_DONTNEED
evicts2=$(kstat dbufstats.cache_count)
log_note "cache_count before=$evicts1 after=$evicts2"
log_must [ $evicts1 -gt $evicts2 ]
log_must file_write -o create -f $FILE1 -b 12000 -c 1
sync_pool $TESTPOOL
log_must file_fadvise -f $FILE1 -a POSIX_FADV_DONTNEED
log_pass "POSIX_FADV_DONTNEED evicts data from the dbuf cache"