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MFV r348576: 9963 Seperate tunable for disabling ZIL vdev flush

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illumos/illumos-gate@f8fdf68125

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Author:     Prakash Surya <prakash.surya@delphix.com>
This commit is contained in:
Alexander Motin 2019-06-03 20:05:43 +00:00
commit a66a7143d4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348577
3 changed files with 23 additions and 8 deletions
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9
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
View File

@ -217,6 +217,15 @@ SYSCTL_INT(_vfs_zfs, OID_AUTO, standard_sm_blksz, CTLFLAG_RDTUN,
&vdev_standard_sm_blksz, 0,
"Block size for standard space map. Power of 2 and greater than 4096.");
/*
* Tunable parameter for debugging or performance analysis. Setting this
* will cause pool corruption on power loss if a volatile out-of-order
* write cache is enabled.
*/
boolean_t zfs_nocacheflush = B_FALSE;
SYSCTL_INT(_vfs_zfs, OID_AUTO, cache_flush_disable, CTLFLAG_RWTUN,
&zfs_nocacheflush, 0, "Disable cache flush");
/*PRINTFLIKE2*/
void
vdev_dbgmsg(vdev_t *vd, const char *fmt, ...)

4
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_file.c
View File

@ -239,6 +239,10 @@ vdev_file_io_start(zio_t *zio)
switch (zio->io_cmd) {
case DKIOCFLUSHWRITECACHE:
if (zfs_nocacheflush)
break;
zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
kcred, NULL);
break;

18
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c
View File

@ -98,13 +98,15 @@ SYSCTL_INT(_vfs_zfs, OID_AUTO, zil_replay_disable, CTLFLAG_RWTUN,
&zil_replay_disable, 0, "Disable intent logging replay");
/*
* Tunable parameter for debugging or performance analysis. Setting
* zfs_nocacheflush will cause corruption on power loss if a volatile
* out-of-order write cache is enabled.
* Disable the DKIOCFLUSHWRITECACHE commands that are normally sent to
* the disk(s) by the ZIL after an LWB write has completed. Setting this
* will cause ZIL corruption on power loss if a volatile out-of-order
* write cache is enabled.
*/
boolean_t zfs_nocacheflush = B_FALSE;
SYSCTL_INT(_vfs_zfs, OID_AUTO, cache_flush_disable, CTLFLAG_RWTUN,
&zfs_nocacheflush, 0, "Disable cache flush");
boolean_t zil_nocacheflush = B_FALSE;
SYSCTL_INT(_vfs_zfs, OID_AUTO, zil_nocacheflush, CTLFLAG_RWTUN,
&zil_nocacheflush, 0, "Disable ZIL cache flush");
boolean_t zfs_trim_enabled = B_TRUE;
SYSCTL_DECL(_vfs_zfs_trim);
SYSCTL_INT(_vfs_zfs_trim, OID_AUTO, enabled, CTLFLAG_RDTUN, &zfs_trim_enabled, 0,
@ -989,7 +991,7 @@ zil_lwb_add_block(lwb_t *lwb, const blkptr_t *bp)
int ndvas = BP_GET_NDVAS(bp);
int i;
if (zfs_nocacheflush)
if (zil_nocacheflush)
return;
mutex_enter(&lwb->lwb_vdev_lock);
@ -1013,7 +1015,7 @@ zil_lwb_add_txg(lwb_t *lwb, uint64_t txg)
/*
* This function is a called after all VDEVs associated with a given lwb
* write have completed their DKIOCFLUSHWRITECACHE command; or as soon
* as the lwb write completes, if "zfs_nocacheflush" is set.
* as the lwb write completes, if "zil_nocacheflush" is set.
*
* The intention is for this function to be called as soon as the
* contents of an lwb are considered "stable" on disk, and will survive