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Pool allocation classes misplacing small file blocks

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Due to an off-by-one condition in spa_preferred_class() we are picking
the "normal" allocation class instead of the "special" one for file
blocks with size equal to the special_small_blocks property value.

This change fix the small code issue, update the ZFS Test Suite and the
zfs(8) man page.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #8351
Closes #8361
This commit is contained in:
loli10K
2019-02-08 21:32:12 +01:00
committed by Matthew Ahrens
parent 0902c4577f
commit 4417096956
3 changed files with 47 additions and 4 deletions
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module/zfs/spa_misc.c
+1 -1
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@@ -1851,7 +1851,7 @@ spa_preferred_class(spa_t *spa, uint64_t size, dmu_object_type_t objtype,
* zfs_special_class_metadata_reserve_pct exclusively for metadata.
*/
if (DMU_OT_IS_FILE(objtype) &&
has_special_class && size < special_smallblk) {
has_special_class && size <= special_smallblk) {
metaslab_class_t *special = spa_special_class(spa);
uint64_t alloc = metaslab_class_get_alloc(special);
uint64_t space = metaslab_class_get_space(special);