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Illumos #3964 L2ARC should always compress metadata buffers 

3964 L2ARC should always compress metadata buffers
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>

References:
  https://www.illumos.org/issues/3964

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1379
This commit is contained in:
Saso Kiselkov 2013-08-08 13:33:18 -07:00 committed by Brian Behlendorf
parent 3a17a7a99a
commit 4e59f47511
3 changed files with 5 additions and 2 deletions
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3
include/sys/dbuf.h
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@ -324,7 +324,8 @@ boolean_t dbuf_is_metadata(dmu_buf_impl_t *db);
((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
#define DBUF_IS_L2COMPRESSIBLE(_db) \
((_db)->db_objset->os_compress != ZIO_COMPRESS_OFF)
((_db)->db_objset->os_compress != ZIO_COMPRESS_OFF || \
(dbuf_is_metadata(_db) && zfs_mdcomp_disable == B_FALSE))
#ifdef ZFS_DEBUG

2
include/sys/dmu.h
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@ -828,6 +828,8 @@ int dmu_diff(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp,
#define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
extern uint64_t zfs_crc64_table[256];
extern int zfs_mdcomp_disable;
#ifdef __cplusplus
}
#endif

2
include/sys/dmu_objset.h
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@ -130,7 +130,7 @@ struct objset {
((os)->os_secondary_cache == ZFS_CACHE_ALL || \
(os)->os_secondary_cache == ZFS_CACHE_METADATA)
#define DMU_OS_IS_L2COMPRESSIBLE(os) ((os)->os_compress != ZIO_COMPRESS_OFF)
#define DMU_OS_IS_L2COMPRESSIBLE(os) (zfs_mdcomp_disable == B_FALSE)
/* called from zpl */
int dmu_objset_hold(const char *name, void *tag, objset_t **osp);