src/cddl/lib, branch release/9.2.0 FreeBSD source tree Added ZFS TRIM support which is enabled by default. To disable 2013-06-05T13:03:47+00:00 Steven Hartland smh@FreeBSD.org 2013-06-05T13:03:47+00:00 7764f4fe60a78e0b5971ed4f34e306efd66bc3c1 ZFS TRIM support set vfs.zfs.trim.enabled=0 in loader.conf. Creating new ZFS pools and adding new devices to existing pools first performs a full device level TRIM which can take a significant amount of time. The sysctl vfs.zfs.vdev.trim_on_init can be set to 0 to disable this behaviour. ZFS TRIM requires the underlying device support BIO_DELETE which is currently provided by methods such as ATA TRIM and SCSI UNMAP via CAM, which are typically supported by SSD's. Stats for ZFS TRIM can be monitored by looking at the sysctl's under kstat.zfs.misc.zio_trim. MFC r240868: Add TRIM support MFC r244155: Renamed zfs trim stats MFC r244187: Upgrade TRIM free request sizes optimisation MFC r244188: Added vfs.zfs.vdev.trim_on_init sysctl MFC r248572: Add TRIM support for L2ARC MFC r248574: Improve TXG handling in the TRIM module MFC r248575: TRIM cache devices based on time instead of TXGs MFC r248576: Names the ZFS TRIM thread MFC r248577: Optimisation of TRIM processing MFC r248602: Fix for building libzpool under i386 MFC r249921: Enabled ZFS TRIM by default 
ZFS TRIM support set vfs.zfs.trim.enabled=0 in loader.conf.

Creating new ZFS pools and adding new devices to existing pools
first performs a full device level TRIM which can take a significant
amount of time. The sysctl vfs.zfs.vdev.trim_on_init can be set to 0
to disable this behaviour.

ZFS TRIM requires the underlying device support BIO_DELETE which
is currently provided by methods such as ATA TRIM and SCSI UNMAP
via CAM, which are typically supported by SSD's.

Stats for ZFS TRIM can be monitored by looking at the sysctl's
under kstat.zfs.misc.zio_trim.

MFC r240868: Add TRIM support
MFC r244155: Renamed zfs trim stats
MFC r244187: Upgrade TRIM free request sizes optimisation
MFC r244188: Added vfs.zfs.vdev.trim_on_init sysctl
MFC r248572: Add TRIM support for L2ARC
MFC r248574: Improve TXG handling in the TRIM module
MFC r248575: TRIM cache devices based on time instead of TXGs
MFC r248576: Names the ZFS TRIM thread
MFC r248577: Optimisation of TRIM processing
MFC r248602: Fix for building libzpool under i386
MFC r249921: Enabled ZFS TRIM by default
MFC r250337 2013-05-12T00:35:57+00:00 Brooks Davis brooks@FreeBSD.org 2013-05-12T00:35:57+00:00 34972d1211343fa3cc545b3baaf834cb2f1d337c Work around the implementation of LIBRARIES_ONLY. It causes drti.o to not be installed in /usr/lib32 on systems with compat-32 support. This fix has two parts. First, the build is forced by linking drti.o into a dummy internal library. Second, the object file is installed manually in the LIBRARIES_ONLY case. 
Work around the implementation of LIBRARIES_ONLY.  It causes drti.o to
not be installed in /usr/lib32 on systems with compat-32 support.

This fix has two parts.  First, the build is forced by linking drti.o
into a dummy internal library.  Second, the object file is installed
manually in the LIBRARIES_ONLY case.
MFC r249526, r249600: 2013-05-10T21:39:41+00:00 Pedro F. Giffuni pfg@FreeBSD.org 2013-05-10T21:39:41+00:00 edaf3743abb304d13dd3b25b43fa2ec5f9aa4d5d DTrace: NFS translators should be split into client/server pieces Merge change from illumos: 1731 DTrace NFS translators should be split into client/server pieces Include Changes from OpenSolaris: PSARC 2008/050 DTrace NFS v3 Provider 6696397 NFS v3 provider reports all UDP clients as 0.0.0.0 6711844 assert: vp-->v_shrlocks Illumos Revision: 13523:6763769941d2 This code seems to be currently unused on FreeBSD. Reference: https://www.illumos.org/issues/1731 Obtained from: Illumos 
DTrace: NFS translators should be split into client/server pieces

Merge change from illumos:

1731 DTrace NFS translators should be split into client/server pieces

Include Changes from OpenSolaris:
PSARC 2008/050 DTrace NFS v3 Provider
6696397 NFS v3 provider reports all UDP clients as 0.0.0.0
6711844 assert: vp-->v_shrlocks

Illumos Revision:	13523:6763769941d2

This code seems to be currently unused on FreeBSD.

Reference:
https://www.illumos.org/issues/1731

Obtained from:	Illumos
MFC r248690, r248706, 248708, r248752: 2013-04-24T20:10:52+00:00 Pedro F. Giffuni pfg@FreeBSD.org 2013-04-24T20:10:52+00:00 66c5c2cd267e16f3549660241910779711b91cfb Dtrace: merge new functions from Illumos. This covers illumos issues: 1455 DTrace tracemem() should take an optional size argument 1451 DTrace needs toupper()/tolower() subroutines 1457 lltostr() D subroutine should take an optional base 1694 Add type-aware print() action 3511 dtrace.c erroneously checks for memory alignment on amd64 This includes an enhanced print() described here: http://dtrace.org/blogs/eschrock/2011/10/26/your-mdb-fell-into-my-dtrace/ This change bumps the DT_VERS_* number to 1.9.0 in accordance to what is done in illumos. Illumos Revisions: 13457:571b0355c2e3 13458:5e394d8db762 13459:c3454574dd1a 13501:c3a7090dbc16 13483:f413e6c5d297 Reference: https://www.illumos.org/issues/1455 https://www.illumos.org/issues/1451 https://www.illumos.org/issues/1457 https://www.illumos.org/issues/1560 https://www.illumos.org/issues/1694 https://www.illumos.org/issues/3511 Tested by: Fabian Keil Obtained from: Illumos 
Dtrace: merge new functions from Illumos.

This covers illumos issues:

1455 DTrace tracemem() should take an optional size argument
1451 DTrace needs toupper()/tolower() subroutines
1457 lltostr() D subroutine should take an optional base
1694 Add type-aware print() action
3511 dtrace.c erroneously checks for memory alignment on amd64

This includes an enhanced print() described here:

http://dtrace.org/blogs/eschrock/2011/10/26/your-mdb-fell-into-my-dtrace/

This change bumps the DT_VERS_* number to 1.9.0 in
accordance to what is done in illumos.

Illumos Revisions:	13457:571b0355c2e3
			13458:5e394d8db762
			13459:c3454574dd1a
			13501:c3a7090dbc16
			13483:f413e6c5d297

Reference:
https://www.illumos.org/issues/1455
https://www.illumos.org/issues/1451
https://www.illumos.org/issues/1457
https://www.illumos.org/issues/1560
https://www.illumos.org/issues/1694
https://www.illumos.org/issues/3511

Tested by:	Fabian Keil
Obtained from:	Illumos
MFC 248571,248976,249004,249042,249188,249195-249196,249206,249207,249319, 2013-04-19T09:19:10+00:00 Martin Matuska mm@FreeBSD.org 2013-04-19T09:19:10+00:00 c037d24e8b8214b49b65844ec7749c16b9f73a45 249326,249356-249357 Merge libzfs_core and other ZFS bugfixes and improvements. MFC r248571: MFV 238590, 238592: In the first zfs ioctl restructuring phase, the libzfs_core library was introduced. It is a new thin library that wraps around kernel ioctl's. The idea is to provide a forward-compatible way of dealing with new features. Arguments are passed in nvlists and not random zfs_cmd fields, new-style ioctls are logged to pool history using a new method of history logging. http://blog.delphix.com/matt/2012/01/17/the-future-of-libzfs/ MFV 247580 [1]: To address issues of several deadlocks and race conditions the locking code around dsl_dataset was rewritten and the interface to synctasks was changed. User-Visible Changes: "zfs snapshot" can create more arbitrary snapshots at once (atomically) "zfs destroy" destroys multiple snapshots at once "zfs recv" has improved performance Backward Compatibility: I have extended the compatibility layer to support full backward compatibility by remapping or rewriting the responsible ioctl arguments. Old utilities are fully supported by the new kernel module. Forward Compatibility: New utilities work with old kernels with the following restrictions: - creating, destroying, holding and releasing of multiple snapshots at once is not supported, this includes recursive (-r) commands Illumos ZFS issues: 2882 implement libzfs_core 2900 "zfs snapshot" should be able to create multiple, arbitrary snapshots at once 3464 zfs synctask code needs restructuring MFC r248976: Call dmu_snapshot_list_next() in zvol.c with dsl_pool_config lock held MFC r249004: Do not check against uninitialized rc and comment out vendor code MFC r249042: Fix possible pool hold leak in dmu_send_impl() Illumos ZFS issues: 3645 dmu_send_impl: possibilty of pool hold leak MFC r249188: Import vendor change to reduce diff, no effect on FreeBSD. Illumos ZFS issues: 3517 importing pool with autoreplace=on and "hole" vdevs crashes syseventd MFC r249195: Merge change from vendor to reduce diff only. ZFS dtrace probes are not supported on FreeBSD yet. Illumos ZFS issues: 3598 want to dtrace when errors are generated in zfs MFC r249196: Provide a fix for kernel panic if receiving recursive deduplicated streams. Problem reported to vendor. Illumos ZFS issues: 3692 Panic on zfs receive of a recursive deduplicated stream MFC r249206: Merge vendor change - modify time processing in deadman thread. Illumos ZFS issues: 3618 ::zio dcmd does not show timestamp data MFC r249207: Allow zdb to output a histogram of compressed block sizes. Illumos ZFS issues: 3641 want a histogram of compressed block sizes MFC r249319: ZFS expects a copyout of zfs_cmd_t on an ioctl error. Our sys_ioctl() doesn't copyout in this case. To solve this a new struct zfs_iocparm_t is introduced consisting of: - zfs_ioctl_version (future backwards compatibility purposes) - user space pointer to zfs_cmd_t (copyin and copyout) - size of zfs_cmd_t (verification purposes) The copyin and copyout of zfs_cmd_t is now done the illumos (vendor) way what makes porting of new changes easier and ensures correct behavior if returning an error. MFC r249326: Cast (void *)(uintptr_t) on copyout and copyin of zfs_iocparm_t.zfs_cmd MFC r249356: Merge bugfixes accepted and integrated by vendor. Underlying problems have been reported by us and fixed in r240942 and r249196. Illumos ZFS issues: 3645 dmu_send_impl: possibilty of pool hold leak 3692 Panic on zfs receive of a recursive deduplicated stream MFC r249357: Fix libzfs to report error instead of returning zero if trying to hold or release a non-existing snapshot of a existing dataset. In recursive case error is reported if no snapshots with the requested name have been found. Illumos ZFS issues: 3699 zfs hold or release of a non-existent snapshot does not output error 
    249326,249356-249357

Merge libzfs_core and other ZFS bugfixes and improvements.

MFC r248571:
  MFV 238590, 238592:
  In the first zfs ioctl restructuring phase, the libzfs_core library was
  introduced. It is a new thin library that wraps around kernel ioctl's.
  The idea is to provide a forward-compatible way of dealing with new
  features. Arguments are passed in nvlists and not random zfs_cmd fields,
  new-style ioctls are logged to pool history using a new method of
  history logging.

  http://blog.delphix.com/matt/2012/01/17/the-future-of-libzfs/

  MFV 247580 [1]:
  To address issues of several deadlocks and race conditions the locking
  code around dsl_dataset was rewritten and the interface to synctasks
  was changed.

  User-Visible Changes:
  "zfs snapshot" can create more arbitrary snapshots at once (atomically)
  "zfs destroy" destroys multiple snapshots at once
  "zfs recv" has improved performance

  Backward Compatibility:
  I have extended the compatibility layer to support full backward
  compatibility by remapping or rewriting the responsible ioctl arguments.
  Old utilities are fully supported by the new kernel module.

  Forward Compatibility:
  New utilities work with old kernels with the following restrictions:
    - creating, destroying, holding and releasing of multiple snapshots
      at once is not supported, this includes recursive (-r) commands

  Illumos ZFS issues:
    2882 implement libzfs_core
    2900 "zfs snapshot" should be able to create multiple,
         arbitrary snapshots at once
    3464 zfs synctask code needs restructuring

MFC r248976:
  Call dmu_snapshot_list_next() in zvol.c with dsl_pool_config lock held

MFC r249004:
  Do not check against uninitialized rc and comment out vendor code

MFC r249042:
  Fix possible pool hold leak in dmu_send_impl()

  Illumos ZFS issues:
    3645 dmu_send_impl: possibilty of pool hold leak

MFC r249188:
  Import vendor change to reduce diff, no effect on FreeBSD.

  Illumos ZFS issues:
    3517 importing pool with autoreplace=on and "hole" vdevs crashes
	 syseventd

MFC r249195:
  Merge change from vendor to reduce diff only.
  ZFS dtrace probes are not supported on FreeBSD yet.

  Illumos ZFS issues:
    3598 want to dtrace when errors are generated in zfs

MFC r249196:
  Provide a fix for kernel panic if receiving recursive deduplicated
  streams. Problem reported to vendor.

  Illumos ZFS issues:
    3692 Panic on zfs receive of a recursive deduplicated stream

MFC r249206:
  Merge vendor change - modify time processing in deadman thread.

  Illumos ZFS issues:
    3618 ::zio dcmd does not show timestamp data

MFC r249207:
  Allow zdb to output a histogram of compressed block sizes.

  Illumos ZFS issues:
    3641 want a histogram of compressed block sizes

MFC r249319:
  ZFS expects a copyout of zfs_cmd_t on an ioctl error. Our sys_ioctl()
  doesn't copyout in this case.

  To solve this a new struct zfs_iocparm_t is introduced consisting of:
  - zfs_ioctl_version (future backwards compatibility purposes)
  - user space pointer to zfs_cmd_t (copyin and copyout)
  - size of zfs_cmd_t (verification purposes)

  The copyin and copyout of zfs_cmd_t is now done the illumos (vendor) way
  what makes porting of new changes easier and ensures correct behavior if
  returning an error.

MFC r249326:
  Cast (void *)(uintptr_t) on copyout and copyin of zfs_iocparm_t.zfs_cmd

MFC r249356:
  Merge bugfixes accepted and integrated by vendor. Underlying problems
  have been reported by us and fixed in r240942 and r249196.

  Illumos ZFS issues:
    3645 dmu_send_impl: possibilty of pool hold leak
    3692 Panic on zfs receive of a recursive deduplicated stream

MFC r249357:
  Fix libzfs to report error instead of returning zero if trying to hold or
  release a non-existing snapshot of a existing dataset. In recursive case
  error is reported if no snapshots with the requested name have been found.

  Illumos ZFS issues:
    3699 zfs hold or release of a non-existent snapshot does not output
	 error
MFC r245561,245885: 2013-03-15T20:34:10+00:00 Brooks Davis brooks@FreeBSD.org 2013-03-15T20:34:10+00:00 8f8c460aa852d22bb21cb5291f5fd14da4c9e0a6 Add a new LIBRARIES_ONLY make variable to disable the build and install of files other than the actual libraries. Use LIBRARIES_ONLY to supress the inclusion of files in the lib32 distribution that are duplicates of files in base. Sponsored by: DARPA, AFRL Reviewed by: emaste 
Add a new LIBRARIES_ONLY make variable to disable the build and install
of files other than the actual libraries.

Use LIBRARIES_ONLY to supress the inclusion of files in the lib32
distribution that are duplicates of files in base.

Sponsored by:	DARPA, AFRL
Reviewed by:	emaste
MFC: 238366, 240924 2012-12-07T19:06:40+00:00 George V. Neville-Neil gnn@FreeBSD.org 2012-12-07T19:06:40+00:00 13f9ad554f6ef88de8627282ef46ed6ee3105d27 Initial commit of an I/O provider for DTrace on FreeBSD. These probes are most useful when looking into the structures they provide, which are listed in io.d. For example: dtrace -n 'io:kernel::start { printf("%d\n", args[0]->bio_bcount); }' Note that the I/O systems in FreeBSD and Solaris/Illumos are sufficiently different that there is not a 1:1 mapping from scripts that work with one to the other. This commit includes the fix so that our probes use "kernel" instead of the Solaris specific "genunix" 
Initial commit of an I/O provider for DTrace on FreeBSD.

 These probes are most useful when looking into the structures
 they provide, which are listed in io.d.  For example:

 dtrace -n 'io:kernel::start { printf("%d\n", args[0]->bio_bcount); }'

 Note that the I/O systems in FreeBSD and Solaris/Illumos are sufficiently
 different that there is not a 1:1 mapping from scripts that work
 with one to the other.

This commit includes the fix so that our probes use "kernel"
instead of the Solaris specific "genunix"
Merge ZFS feature flags support and related bugfixes: 2012-11-29T14:05:04+00:00 Martin Matuska mm@FreeBSD.org 2012-11-29T14:05:04+00:00 a26112d4aa410fc344469404720c736ef7a36f74 236884, 237001, 237119, 237458, 237972, 238113, 238391, 238422, 238926, 238950, 238951, 239389, 239394, 239620, 239774, 239953, 239958, 239967, 239968, 240063, 240133, 240153, 240303, 240345, 240415, 240955, 241655, 243014, 243505, 243506 MFC r236884: Introduce "feature flags" for ZFS pools (bump SPA version to 5000). Add first feature "com.delphix:async_destroy" (asynchronous destroy of ZFS datasets). Implement features support in ZFS boot code. Illumos revisions merged: 13700:2889e2596bd6 13701:1949b688d5fb 2619 asynchronous destruction of ZFS file systems 2747 SPA versioning with zfs feature flags References: https://www.illumos.org/issues/2619 https://www.illumos.org/issues/2747 MFC r237001: Fix ZFS boot with pre-features pools (version <= 28) broken in r236884 MFC r237119 [1]: Do not remount ZFS dataset if changing canmount property to "on" and dataset is already mounted. MFC r237458: Import Illumos revision 13736:9f1d48e1681f 2901 ZFS receive fails for exabyte sparse files References: https://www.illumos.org/issues/2901 MFC r237972: Expose scrub and resilver tunables. This allows the user to tune the priority trade-off between scrub/resilver and other ZFS I/O. MFC r238113 (pjd): vdev_io_done stage is not used for ioctls. MFC r238391: Change behavior introduced in r237119 to vendor solution References: https://www.illumos.org/issues/2883 MFC r238422: Merge illumos commit 13749:df4cd82e2b60 1796 "ZFS HOLD" should not be used when doing "ZFS SEND" froma read-only pool 2871 support for __ZFS_POOL_RESTRICT used by ZFS test suite 2903 zfs destroy -d does not work 2957 zfs destroy -R/r sometimes fails when removing defer-destroyed snapshot References: https://www.illumos.org/issues/1796 https://www.illumos.org/issues/2871 https://www.illumos.org/issues/2903 https://www.illumos.org/issues/2957 MFC r238926: Partial MFV (illumos-gate 13753:2aba784c276b) 2762 zpool command should have better support for feature flags References: https://www.illumos.org/issues/2762 MFC r238950: Fix reporting of root pool upgrade notice. MFC r238951: Fix wrong indent according to style(9) MFC r239389: Backport fix for vendor issue #3085 3085 zfs diff panics, then panics in a loop on booting References: https://www.illumos.org/issues/3085 MFC r239394: Update zfs(8) manpage with illumos version of "zfs diff" Illumos issue: 2399 zfs manual page does not document use of "zfs diff" References: https://www.illumos.org/issues/2399 MFC r239620 [2]: Merge recent vendor changes: 3086 unnecessarily setting DS_FLAG_INCONSISTENT on async destroyed datasets 3090 vdev_reopen() during reguid causes vdev to be treated as corrupt 3102 vdev_uberblock_load() and vdev_validate() may read the wrong label Referenes: https://www.illumos.org/issues/3086 https://www.illumos.org/issues/3090 https://www.illumos.org/issues/3102 MFC r239774: Merge recent vendor changes: 3100 zvol rename fails with EBUSY when dirty 3104 eliminate empty bpobjs 3120 zinject hangs in zfsdev_ioctl() due to uninitialized zc References: https://www.illumos.org/issues/3100 https://www.illumos.org/issues/3104 https://www.illumos.org/issues/3120 MFC r239953 (joel): Mdoc fixes. MFC r239958 (joel): Minor mdoc fixes. MFC r239967 (joel): Mdoc fixes. MFC r239968 (joel): Remove trailing whitespace. MFC r240063 (gjb): Add myself to copyright sections, per CDDL license. MFC r240133: Merge recent vendor changes and sync code: 1862 incremental zfs receive fails for sparse file > 8PB 3112 ztest does not honor ZFS_DEBUG 3122 zfs destroy filesystem should prefetch blocks 3129 'zpool reopen' restarts resilvers 3130 ztest failure: Assertion failed: 0 == dmu_objset_destroy(name, B_FALSE) (0x0 == 0x10) References: https://www.illumos.org/issues/1862 https://www.illumos.org/issues/3112 https://www.illumos.org/issues/3122 https://www.illumos.org/issues/3129 https://www.illumos.org/issues/3130 MFC r240153 (gjb) [3]: Typo fix and minor word swap. MFC r240303: Add assfail() and assfail3() to the opensolaris module. Remove obsoleted intermediate cddl/compat/opensolaris/sys/debug.h. MFC r240345 (avg): zfs: fix sa_modify_attrs handling of variable-sized attributes - skip length_idx index for a replaced variable-sized attribute - skip length_idx index for a removed variable-sized attribute - also re-arranged code to make sure that length_idx is always incremented for variable-sized attributes - additionally add an assertion that the number of actually produced attributes is the same as the expected number of resulting attributes MFC r240415: Merge recent zfs vendor changes, sync code and adjust userland DEBUG. Illumos issued covered: 1884 Empty "used" field for zfs *space commands 3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero 3028 zfs {group,user}space -n prints (null) instead of numeric GID/UID 3048 zfs {user,group}space [-s|-S] is broken 3049 zfs {user,group}space -t doesn't really filter the results 3060 zfs {user,group}space -H output isn't tab-delimited 3061 zfs {user,group}space -o doesn't use specified fields order 3064 usr/src/cmd/zpool/zpool_main.c misspells "successful" 3093 zfs {user,group}space's -i is noop 3098 zfs userspace/groupspace fail without saying why when run as non-root References: https://www.illumos.org/issues/ + [issue_id] MFC r240955 (partial): Merge recent vendor changes in ZFS. Illumos issued covered: 3139 zdb dies when it tries to determine path of unlinked file 3189 kernel panic in ZFS test suite during hotspare_onoffline_004_neg 3208 moving zpool cross-endian results in incorrect user/group accounting References: https://www.illumos.org/issues/ + [issue_id] MFC r241655: Add missing initialization for do_prefix. Corrects porting error in r238391 Vendor issue and changeset reference: 2883 changing "canmount" property to "on" should not always remount dataset https://www.illumos.org/issues/2883 Changeset 13743:95aba6e49b9f MFC r243014: Move zpool-features manual page from section 5 to section 7 and fix references Reported by: pluknet MFC r243505: Illumos 13886:e3261d03efbf 3349 zpool upgrade -V bumps the on disk version number, but leaves the in core version References: https://www.illumos.org/issues/3349 MFC r243506: zfs sha256 checksum is missing in zfs.8 manpage PR: kern/167905 [1], kern/170912 [2], kern/170914 [2], doc/171356 [3] 
236884, 237001, 237119, 237458, 237972, 238113, 238391, 238422, 238926,
238950, 238951, 239389, 239394, 239620, 239774, 239953, 239958, 239967,
239968, 240063, 240133, 240153, 240303, 240345, 240415, 240955, 241655,
243014, 243505, 243506

MFC r236884:
Introduce "feature flags" for ZFS pools (bump SPA version to 5000).
Add first feature "com.delphix:async_destroy" (asynchronous destroy
of ZFS datasets).
Implement features support in ZFS boot code.

Illumos revisions merged:
13700:2889e2596bd6
13701:1949b688d5fb
2619 asynchronous destruction of ZFS file systems
2747 SPA versioning with zfs feature flags

References:
  https://www.illumos.org/issues/2619
  https://www.illumos.org/issues/2747

MFC r237001:
Fix ZFS boot with pre-features pools (version <= 28) broken in r236884

MFC r237119 [1]:
Do not remount ZFS dataset if changing canmount property to "on" and
dataset is already mounted.

MFC r237458:
Import Illumos revision 13736:9f1d48e1681f
2901 ZFS receive fails for exabyte sparse files

References:
  https://www.illumos.org/issues/2901

MFC r237972:
Expose scrub and resilver tunables.
This allows the user to tune the priority trade-off between scrub/resilver
and other ZFS I/O.

MFC r238113 (pjd):
vdev_io_done stage is not used for ioctls.

MFC r238391:
Change behavior introduced in r237119 to vendor solution

References:
  https://www.illumos.org/issues/2883

MFC r238422:
Merge illumos commit 13749:df4cd82e2b60

1796 "ZFS HOLD" should not be used when doing "ZFS SEND" froma read-only pool
2871 support for __ZFS_POOL_RESTRICT used by ZFS test suite
2903 zfs destroy -d does not work
2957 zfs destroy -R/r sometimes fails when removing defer-destroyed snapshot

References:
  https://www.illumos.org/issues/1796
  https://www.illumos.org/issues/2871
  https://www.illumos.org/issues/2903
  https://www.illumos.org/issues/2957

MFC r238926:
Partial MFV (illumos-gate 13753:2aba784c276b)
2762 zpool command should have better support for feature flags

References:
  https://www.illumos.org/issues/2762

MFC r238950:
Fix reporting of root pool upgrade notice.

MFC r238951:
Fix wrong indent according to style(9)

MFC r239389:
Backport fix for vendor issue #3085
3085 zfs diff panics, then panics in a loop on booting

References:
  https://www.illumos.org/issues/3085

MFC r239394:
Update zfs(8) manpage with illumos version of "zfs diff"

Illumos issue:
  2399 zfs manual page does not document use of "zfs diff"

References:
  https://www.illumos.org/issues/2399

MFC r239620 [2]:
Merge recent vendor changes:
3086 unnecessarily setting DS_FLAG_INCONSISTENT on async destroyed datasets
3090 vdev_reopen() during reguid causes vdev to be treated as corrupt
3102 vdev_uberblock_load() and vdev_validate() may read the wrong label

Referenes:
  https://www.illumos.org/issues/3086
  https://www.illumos.org/issues/3090
  https://www.illumos.org/issues/3102

MFC r239774:
Merge recent vendor changes:
3100 zvol rename fails with EBUSY when dirty
3104 eliminate empty bpobjs
3120 zinject hangs in zfsdev_ioctl() due to uninitialized zc

References:
  https://www.illumos.org/issues/3100
  https://www.illumos.org/issues/3104
  https://www.illumos.org/issues/3120

MFC r239953 (joel):
Mdoc fixes.

MFC r239958 (joel):
Minor mdoc fixes.

MFC r239967 (joel):
Mdoc fixes.

MFC r239968 (joel):
Remove trailing whitespace.

MFC r240063 (gjb):
Add myself to copyright sections, per CDDL license.

MFC r240133:
Merge recent vendor changes and sync code:
1862 incremental zfs receive fails for sparse file > 8PB
3112 ztest does not honor ZFS_DEBUG
3122 zfs destroy filesystem should prefetch blocks
3129 'zpool reopen' restarts resilvers
3130 ztest failure: Assertion failed:
       0 == dmu_objset_destroy(name, B_FALSE) (0x0 == 0x10)

References:
  https://www.illumos.org/issues/1862
  https://www.illumos.org/issues/3112
  https://www.illumos.org/issues/3122
  https://www.illumos.org/issues/3129
  https://www.illumos.org/issues/3130

MFC r240153 (gjb) [3]:
Typo fix and minor word swap.

MFC r240303:
Add assfail() and assfail3() to the opensolaris module.
Remove obsoleted intermediate cddl/compat/opensolaris/sys/debug.h.

MFC r240345 (avg):
zfs: fix sa_modify_attrs handling of variable-sized attributes

- skip length_idx index for a replaced variable-sized attribute
- skip length_idx index for a removed variable-sized attribute
- also re-arranged code to make sure that length_idx is always
  incremented for variable-sized attributes
- additionally add an assertion that the number of actually produced
  attributes is the same as the expected number of resulting
  attributes

MFC r240415:
Merge recent zfs vendor changes, sync code and adjust userland DEBUG.

Illumos issued covered:
1884 Empty "used" field for zfs *space commands
3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument
     is zero
3028 zfs {group,user}space -n prints (null) instead of numeric GID/UID
3048 zfs {user,group}space [-s|-S] is broken
3049 zfs {user,group}space -t doesn't really filter the results
3060 zfs {user,group}space -H output isn't tab-delimited
3061 zfs {user,group}space -o doesn't use specified fields order
3064 usr/src/cmd/zpool/zpool_main.c misspells "successful"
3093 zfs {user,group}space's -i is noop
3098 zfs userspace/groupspace fail without saying why when run as non-root

References:
  https://www.illumos.org/issues/ + [issue_id]

MFC r240955 (partial):
Merge recent vendor changes in ZFS.

Illumos issued covered:
3139 zdb dies when it tries to determine path of unlinked file
3189 kernel panic in ZFS test suite during hotspare_onoffline_004_neg
3208 moving zpool cross-endian results in incorrect user/group accounting

References:
  https://www.illumos.org/issues/ + [issue_id]

MFC r241655:
Add missing initialization for do_prefix.
Corrects porting error in r238391

Vendor issue and changeset reference:
2883 changing "canmount" property to "on" should not always remount dataset
https://www.illumos.org/issues/2883
Changeset 13743:95aba6e49b9f

MFC r243014:
Move zpool-features manual page from section 5 to section 7
and fix references

Reported by:	pluknet

MFC r243505:
Illumos 13886:e3261d03efbf

3349 zpool upgrade -V bumps the on disk version number, but leaves
     the in core version

References:
  https://www.illumos.org/issues/3349

MFC r243506:
zfs sha256 checksum is missing in zfs.8 manpage

PR:	kern/167905 [1], kern/170912 [2], kern/170914 [2], doc/171356 [3]
MFC r226940 (rmh): 2012-09-26T12:36:09+00:00 Martin Matuska mm@FreeBSD.org 2012-09-26T12:36:09+00:00 389b47deff1fbbbf0a5fbf827c0d7980e3e9b895 Fix a few gratuitous library dependencies. Some of the ZFS utilities are linked with libraries they don't use: - zinject doesn't use libavl - ztest doesn't use libz - zdb uses neither libavl nor libz - zfs uses neither libbsdxml nor libm, nor libsbuf - zpool uses neither libbsdxml nor libm, nor libsbuf In addition, libzfs needs libm because it uses pow(), however it isn't linked with -lm. This went unnoticed because all its users had -lm before. 
Fix a few gratuitous library dependencies. Some of the ZFS utilities
are linked with libraries they don't use:

 - zinject doesn't use libavl
 - ztest doesn't use libz
 - zdb uses neither libavl nor libz
 - zfs uses neither libbsdxml nor libm, nor libsbuf
 - zpool uses neither libbsdxml nor libm, nor libsbuf

In addition, libzfs needs libm because it uses pow(), however it isn't
linked with -lm.  This went unnoticed because all its users had -lm before.
MFC r228103, r228104: 2012-01-05T11:06:05+00:00 Martin Matuska mm@FreeBSD.org 2012-01-05T11:06:05+00:00 17815f71215b446cc5bcd2dc4a03ced141cd5d99 MFC r228103: Merge new ZFS features from illumos: 1644 add ZFS "clones" property https://www.illumos.org/issues/1644 1645 add ZFS "written" and "written@..." properties https://www.illumos.org/issues/1645 1646 "zfs send" should estimate size of stream https://www.illumos.org/issues/1646 1647 "zfs destroy" should determine space reclaimed by destroying multiple snapshots https://www.illumos.org/issues/1647 1693 persistent 'comment' field for a zpool https://www.illumos.org/issues/1693 1708 adjust size of zpool history data https://www.illumos.org/issues/1708 1748 desire support for reguid in zfs https://www.illumos.org/issues/1748 MFC r228104: Fix typo in copyright notice. Obtained from: illumos (changesets 13514, 13524, 13525) 
MFC r228103:
Merge new ZFS features from illumos:

1644 add ZFS "clones" property
https://www.illumos.org/issues/1644

1645 add ZFS "written" and "written@..." properties
https://www.illumos.org/issues/1645

1646 "zfs send" should estimate size of stream
https://www.illumos.org/issues/1646

1647 "zfs destroy" should determine space reclaimed by destroying multiple
snapshots
https://www.illumos.org/issues/1647

1693 persistent 'comment' field for a zpool
https://www.illumos.org/issues/1693

1708 adjust size of zpool history data
https://www.illumos.org/issues/1708

1748 desire support for reguid in zfs
https://www.illumos.org/issues/1748

MFC r228104:
Fix typo in copyright notice.

Obtained from:	illumos (changesets 13514, 13524, 13525)