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author | pjd <pjd@FreeBSD.org> | 2012-09-23 19:40:58 +0000 |
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committer | pjd <pjd@FreeBSD.org> | 2012-09-23 19:40:58 +0000 |
commit | 618888b019e4005dec19c1688531e25d6ff63c76 (patch) | |
tree | 85c57e3b0f3bd89091304524a42b74d8be588cd6 /sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h | |
parent | 3d431ee1496a9253b224fdc00c445d0ab59e1eb3 (diff) | |
download | FreeBSD-src-618888b019e4005dec19c1688531e25d6ff63c76.zip FreeBSD-src-618888b019e4005dec19c1688531e25d6ff63c76.tar.gz |
Add TRIM support.
The code builds a map of regions that were freed. On every write the
code consults the map and eventually removes ranges that were freed
before, but are now overwritten.
Freed blocks are not TRIMed immediately. There is a tunable that defines
how many txg we should wait with TRIMming freed blocks (64 by default).
There is a low priority thread that TRIMs ranges when the time comes.
During TRIM we keep in-flight ranges on a list to detect colliding
writes - we have to delay writes that collide with in-flight TRIMs in
case something will be reordered and write will reached the disk before
the TRIM. We don't have to do the same for in-flight writes, as
colliding writes just remove ranges to TRIM.
Sponsored by: multiplay.co.uk
This work includes some important fixes and some improvements obtained
from the zfsonlinux project, including TRIMming entire vdevs on pool
create/add/attach and on pool import for spare and cache vdevs.
Obtained from: zfsonlinux
Submitted by: Etienne Dechamps <etienne.dechamps@ovh.net>
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h index 7e34889..a8788a8 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev.h @@ -46,6 +46,7 @@ typedef enum vdev_dtl_type { } vdev_dtl_type_t; extern boolean_t zfs_nocacheflush; +extern boolean_t zfs_notrim; extern int vdev_open(vdev_t *); extern void vdev_open_children(vdev_t *); |