Mercurial > illumos > illumos-gate
changeset 14041:cb4a51285eeb
3805 arc shouldn't cache freed blocks
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Richard Elling <richard.elling@dey-sys.com>
Reviewed by: Will Andrews <will@firepipe.net>
Approved by: Dan McDonald <danmcd@nexenta.com>
| author | Matthew Ahrens <mahrens@delphix.com> |
|---|---|
| date | Fri, 07 Jun 2013 20:29:06 -0800 |
| parents | ebba27d74478 |
| children | e5bd6d1f1685 |
| files | usr/src/uts/common/fs/zfs/arc.c usr/src/uts/common/fs/zfs/sys/arc.h usr/src/uts/common/fs/zfs/zio.c |
| diffstat | 3 files changed, 31 insertions(+), 1 deletions(-) [+] |
line wrap: on
line diff
--- a/usr/src/uts/common/fs/zfs/arc.c Wed Jun 05 16:56:13 2013 +0200 +++ b/usr/src/uts/common/fs/zfs/arc.c Fri Jun 07 20:29:06 2013 -0800 @@ -3111,6 +3111,34 @@ } /* + * Notify the arc that a block was freed, and thus will never be used again. + */ +void +arc_freed(spa_t *spa, const blkptr_t *bp) +{ + arc_buf_hdr_t *hdr; + kmutex_t *hash_lock; + uint64_t guid = spa_load_guid(spa); + + hdr = buf_hash_find(guid, BP_IDENTITY(bp), BP_PHYSICAL_BIRTH(bp), + &hash_lock); + if (hdr == NULL) + return; + if (HDR_BUF_AVAILABLE(hdr)) { + arc_buf_t *buf = hdr->b_buf; + add_reference(hdr, hash_lock, FTAG); + hdr->b_flags &= ~ARC_BUF_AVAILABLE; + mutex_exit(hash_lock); + + arc_release(buf, FTAG); + (void) arc_buf_remove_ref(buf, FTAG); + } else { + mutex_exit(hash_lock); + } + +} + +/* * This is used by the DMU to let the ARC know that a buffer is * being evicted, so the ARC should clean up. If this arc buf * is not yet in the evicted state, it will be put there.
--- a/usr/src/uts/common/fs/zfs/sys/arc.h Wed Jun 05 16:56:13 2013 +0200 +++ b/usr/src/uts/common/fs/zfs/sys/arc.h Fri Jun 07 20:29:06 2013 -0800 @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012 by Delphix. All rights reserved. + * Copyright (c) 2013 by Delphix. All rights reserved. * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */ @@ -110,6 +110,7 @@ blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress, const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority, int zio_flags, const zbookmark_t *zb); +void arc_freed(spa_t *spa, const blkptr_t *bp); void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); int arc_buf_evict(arc_buf_t *buf);
--- a/usr/src/uts/common/fs/zfs/zio.c Wed Jun 05 16:56:13 2013 +0200 +++ b/usr/src/uts/common/fs/zfs/zio.c Fri Jun 07 20:29:06 2013 -0800 @@ -715,6 +715,7 @@ ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); metaslab_check_free(spa, bp); + arc_freed(spa, bp); zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags,