Commit Graph

493 Commits

Author SHA1 Message Date
Trevor Bautista
00888c0898
Extend zpool-iostat to account for ZIO_PRIORITY_REBUILD (#12319)
Previously, zpool-iostat did not display any data regarding rebuild I/Os
in either the latency/size histograms (-w/-l/-r) or the queue data (-q).
This fix essentially utilizes the existing infrastructure for tracking
rebuild queue data and displays this data in the proper places within
zpool-iostat's output.

Signed-off-by: Trevor Bautista <tbautista@newmexicoconsortium.org>
Signed-off-by: Trevor Bautista <tbautista@lanl.gov>
Co-authored-by: Trevor Bautista <tbautista@newmexicoconsortium.org>
Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
2021-08-26 11:26:49 -07:00
Sam Hathaway
2e9e2c8ff5
zpool-remove.8: describe top-level vdev sector size limitation
Document that top-level vdevs cannot be removed unless all top-level
vdevs have the same sector size.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Sam Hathaway <sam@sam-hathaway.com>
Closes #11339
Closes #12472
2021-08-23 14:59:18 -07:00
George Melikov
e1870be450
Man zpool-scrub.8: describe sequential scrub
Describe sequential scrub and add examples of scrub status.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: George Melikov <mail@gmelikov.ru>
Closes #12429
2021-08-05 15:30:28 -06:00
Václav Skála
31c41aea9c Add missing properties to zfs allow manpage
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Václav Skála <skala@vshosting.cz>
Closes #12402
2021-07-26 12:44:01 -07:00
Rich Ercolani
b7ec530233
Correct zfs-send(8) on readonly sends
zfs-send(8) claimed in the flags list you could use -pR when sending
a readonly filesystem or volume. You cannot.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #12336
2021-07-16 13:58:01 -06:00
наб
4b7ed6a286 zgenhostid.8: revisit
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12212
2021-06-09 14:36:03 -07:00
наб
1b37cc1abe Consistentify miscellaneous style on remaining manpages
Most notably this fixes the vdev_id(8) non-.Xrs in vdev_id.conf.5

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12212
2021-06-09 14:35:53 -07:00
наб
2badb3457a Move properties, parameters, events, and concepts around manual sections
The pages moved as follows:
  zpool-features.{5 => 7}
  spl{-module-parameters.5 => .4}
  zfs{-module-parameters.5 => .4}
  zfs-events.5 => into zpool-events.8
  zfsconcepts.{8 => 7}
  zfsprops.{8 => 7}
  zpoolconcepts.{8 => 7}
  zpoolprops.{8 => 7}

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Co-authored-by: Daniel Ebdrup Jensen <debdrup@FreeBSD.org>
Closes #12149
Closes #12212
2021-06-09 14:35:30 -07:00
наб
b0f3e8a6eb man: use one Makefile, use OpenZFS for .Os
The prevailing style is to use either nothing, or the originating
organisational umbrella (here: OpenZFS), and these aren't Linux manpages

This also deduplicates the substitution code, and makes adding/removing
sexions simpler in future

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12212
2021-06-09 14:34:47 -07:00
наб
2d815d955e
Modernise/fix/rewrite unlinted manpages
zpool-destroy.8: flatten, fix description
zfs-wait.8: flatten, fix description, use list for events
zpool-reguid.8: flatten, fix description
zpool-history.8: flatten, fix description
zpool-export.8: flatten, fix description, remove -f "unmount" reference
  AFAICT no such command exists even in Illumos (as of today, anyway),
  and we definitely don't call it
zpool-labelclear.8: flatten, fix description
zpool-features.5: modernise
spl-module-parameters.5: modernise
zfs-mount-generator.8: rewrite
zfs-module-parameters.5: modernise

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12169
2021-06-07 13:41:54 -06:00
наб
f84fe3fc87 Lint most manpages
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12129
2021-06-04 12:48:31 -07:00
наб
56454b0391 man: use Nm/Cm/Fl consistently
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:22:19 -07:00
наб
1f3cbcfcc5 zed.8: modernise
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:22:14 -07:00
наб
76b8f7cf53 vdev_id.8: modernise, note scsi topology
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:22:01 -07:00
наб
2c9c5bc859 zpool_influxdb.8: modernise
Also rip out the section about potentially including in the OpenZFS
distribution and simplify -e description

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:21:59 -07:00
наб
3d00fbf9a0 zinject.8: modernise
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:21:58 -07:00
наб
defa5a0ae5 zpoolprops.8: fix spacing in ashift
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:21:55 -07:00
наб
2b42a1e57e fsck.zfs.8: modernise
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:21:54 -07:00
наб
b1821d06c3 zgenhostid.8: use single-line indent macro for single-line examples
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12125
2021-05-29 20:21:46 -07:00
наб
5a1fb060fd etc/systemd/zfs-mount-generator: rewrite in C
A plain rewrite of the shell version, and generates identical
units, save for replacing some empty lines with nothing, having fewer
meaningless spaces in After=s and different spacing in the lock scripts,
for a clean git diff -w

This is a gain of anywhere from 0m0.336s vs 0m0.022s (15.27x)
to 0m0.202s vs 0m0.006s (33.67x), depending on the hardware,
a.k.a. from "absolutely unusable" to "perfectly fine"

This also properly deals with canmount=noauto units across multiple
pools

See PR for detailed timings (of an early version) and diffs

Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: InsanePrawn <insane.prawny@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #11915
Closes #11917
2021-05-27 08:45:51 -07:00
наб
20bd864edc mount.zfs.8: match to reality; zfsprops.8: add missing temporary options
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12111
2021-05-26 21:44:56 -07:00
наб
eae3598ae4 mount.zfs.8: modernise
No changes to the text itself

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12111
2021-05-26 21:44:50 -07:00
наб
fb9baa9b20 zfsprops.8: remove nbmand-not-used-on-Linux and pointer to mount(8)
Linux man-pages' mount(8) points at fcntl(2), as does mount(2),
and support for it is little-used, deprecated, and configurable
since 4.5.

As far as I can tell, FreeBSD doesn't support nbmand at all ‒
mandatory locks are mostly dead

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12111
2021-05-26 21:44:29 -07:00
наб
dd00925e8d zstreamdump: replace with link to zstream
zstreamdump(8) was in quite a bad state,
and the wrapper didn't work if invoked without /sbin in $PATH

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12015
2021-05-21 10:16:14 -07:00
Lauri Tirkkonen
6ac2d7f76f
zfs-allow.8: mention 'bookmark' permission
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Lauri Tirkkonen <lauri@hacktheplanet.fi>
Closes #12064
2021-05-20 09:03:03 -07:00
Ryan Moeller
210231ede0 FreeBSD: Implement xattr=sa
FreeBSD historically has not cared about the xattr property; it was
always treated as xattr=on.  With xattr=on, xattrs are stored as files
in a hidden xattr directory.  With xattr=sa, xattrs are stored as
system attributes and get cached in nvlists during xattr operations.
This makes SA xattrs simpler and more efficient to manipulate.  FreeBSD
needs to implement the SA xattr operations for feature parity with
Linux and to ensure that SA xattrs are accessible when migrated or
replicated from Linux.

Following the example set by Linux, refactor our existing extattr vnops
to split off the parts handling dir style xattrs, and add the
corresponding SA handling parts.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11997
2021-05-13 15:14:12 -07:00
наб
618a65cd7a Widen mancheck target to all pages, fix them
mandoc: ./man/man8/zfs-mount-generator.8.in:188:2:
        ERROR: skipping end of block that is not open: RE
mandoc: ./man/man8/zfs_ids_to_path.8:38:2:
        ERROR: skipping unknown macro: .LP
mandoc: ./man/man8/zfs_ids_to_path.8:48:2:
        ERROR: inserting missing end of block: Sh breaks Bl
mandoc: ./man/man8/zfs-wait.8:69:2:
        ERROR: skipping end of block that is not open: El
mandoc: ./man/man8/zfs-program.8:460:2:
        ERROR: inserting missing end of block: It breaks Bd
mandoc: ./man/man8/zfs-mount-generator.8:188:2:
        ERROR: skipping end of block that is not open: RE
mandoc: ./man/man8/zstream.8:43:2:
        ERROR: skipping unknown macro: .LP
mandoc: ./man/man8/zstream.8:107:2:
        ERROR: inserting missing end of block: Sh breaks Bl
mandoc: ./man/man8/zstream.8:107:2:
        ERROR: inserting missing end of block: Sh breaks Bl
make: *** [Makefile:1529: mancheck] Error 1

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #12017
2021-05-12 21:32:48 -07:00
наб
37086897b0
libzfs: add keylocation=https://, backed by fetch(3) or libcurl
Add support for http and https to the keylocation properly to
allow encryption keys to be fetched from the specified URL.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #9543
Closes #9947 
Closes #11956
2021-05-12 21:21:35 -07:00
Ryan Moeller
4704be2879
Remove unimplemented virus scanning hooks
Reviewed-by: Adam Moss <c@yotes.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11972
2021-05-10 22:02:25 -07:00
наб
1966e959ca Replace ZoL with OpenZFS where applicable
Afterward, git grep ZoL matches:
  * README.md:  * [ZoL Site](https://zfsonlinux.org)
  - Correct
  * etc/default/zfs.in:# ZoL userland configuration.
  - Changing this would induce a needless upgrade-check,
    if the user has modified the configuration;
    this can be updated the next time the defaults change
  * module/zfs/dmu_send.c:   * ZoL < 0.7 does not handle [...]
  - Before 0.7 is ZoL, so fair enough

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #11956
2021-05-07 17:20:37 -07:00
Daniel Stevenson
60ffc1c460
Fixed incorrect man page reference in zfsprops(8)
The special_small_blocks section directed readers to zpool(8) for
documentation on special allocation classes, while they are actually
documented in zpoolconcepts(8).

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Daniel Stevenson <daniel@dstev.net>
Closes #11918
2021-04-20 10:16:00 -07:00
Ryan Moeller
d92af6fc8d
zfs-send(8): Restore sorting of flags
Before #11710 the flags in zfs-send(8) were sorted.
Restore order and bump the date.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11905
2021-04-15 17:43:07 -07:00
Colm
e086db1656
Improvements to the 'compatibility' property
Several improvements to the operation of the 'compatibility' property:

1) Improved handling of unrecognized features:
Change the way unrecognized features in compatibility files are handled.

 * invalid features in files under /usr/share/zfs/compatibility.d
   only get a warning (as these may refer to future features not yet in
   the library),
 * invalid features in files under /etc/zfs/compatibility.d
   get an error (as these are presumed to refer to the current system).

2) Improved error reporting from zpool_load_compat.
Note: slight ABI change to zpool_load_compat for better error reporting.

3) compatibility=legacy inhibits all 'zpool upgrade' operations.

4) Detect when features are enabled outside current compatibility set
   * zpool set compatibility=foo <-- print a warning
   * zpool set feature@xxx=enabled <-- error
   * zpool status <-- indicate this state

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Colm Buckley <colm@tuatha.org>
Closes #11861
2021-04-12 09:08:56 -07:00
наб
0395cf92e0 zfprops(8): fix spacing in jailed= arguments
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11866
2021-04-11 15:42:24 -07:00
наб
0241dfac47 zfs-[un]jail(8): fix "zfs-jail [un]jail" leftovers
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11866
2021-04-11 15:41:55 -07:00
pablofsf
099fa7e475
Allow zfs to send replication streams with missing snapshots
A tentative implementation and discussion was done in #5285.
According to it a send --skip-missing|-s flag has been added.
In a replication stream, when there are snapshots missing in
the hierarchy, if -s is provided print a warning and ignore
dataset (and its children) instead of throwing an error

Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pablo Correa Gómez <ablocorrea@hotmail.com>
Closes #11710
2021-04-11 12:05:35 -07:00
наб
509a2dcf7d zed.8: the Diagnosis Engine is implemented
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11834
2021-04-07 14:52:42 -07:00
наб
3d62acf0ad zed: merge all _NOT_IMPLEMENTED_ events
These events should currently never be generated.

Also untag _zed_event_add_nvpair() from merge with
zpool_do_events_nvprint() ‒ they serve different purposes (machine,
usually script vs human consumption) and format the output differently
as it stands

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11834
2021-04-07 14:51:34 -07:00
наб
c52612ba03 zed.8: don't pretend an unprivileged user could change the script owner
And add a note on /why/ ZEDLETs need to be owned by root

Quoth chown(2), Linux man-pages project:
  Only a privileged process (Linux: one with the CAP_CHOWN capability)
  may change the owner of a file.

Quoth chown(2), FreeBSD:
     [EPERM]  The operation would change the ownership,
              but the effective user ID is not the super-user.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11834
2021-04-07 14:51:06 -07:00
наб
ed519ad495 zed: purge all mentions of a configuration file
There simply isn't a need for one, since the flags the daemon takes
are all short (mostly just toggles) and administrative in nature,
and are therefore better served by the age-old tradition of sourcing an
environment file and preparing the cmdline in the init-specific handler
itself, if needed at all

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11834
2021-04-07 14:50:52 -07:00
George Melikov
d35708b187
man: fix wrong .Xr macros usages
In addition, html doc will have working hyperlinks.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: George Melikov <mail@gmelikov.ru>
Closes #11845
2021-04-06 12:27:40 -07:00
Andrea Gelmini
bf169e9f15 Fix various typos
Correct an assortment of typos throughout the code base.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Closes #11774
2021-04-02 18:52:15 -07:00
наб
73218f41b4 zed: allow limiting concurrent jobs
200ms time-out is relatively long, but if we already hit the cap,
then we'll likely be able to spawn multiple new jobs when we wake up

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11807
2021-04-02 16:30:53 -07:00
наб
ca2ce9c50b zed: use separate reaper thread and collect ZEDLETs asynchronously
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11807
2021-04-02 16:30:08 -07:00
наб
0c2eb3f540
fsck.zfs: implement 4/8 exit codes as suggested in manpage
Update the fsck.zfs helper to bubble up some already-known-about 
errors if they are detected in the pool.

health=degraded => 4/"Filesystem errors left uncorrected"
health=faulted && dataset in /etc/fstab => 8/"Operational error"
pool not found => 8/"Operational error"
everything else => 0

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11806
2021-03-31 10:49:56 -07:00
наб
38280c3526
zed: reap child after killing on time-out
When a child process is killed waitpid() must be called on the
pid the reap the zombie process.

Update BUGS section to reflect reality by replacing "zedlets
aren't time limited with "zedlets can be interrupted".

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11769 
Closes #11798
2021-03-26 14:21:00 -07:00
Ryan Moeller
0ab84bff55
Fix typo in zgenhostid.8
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11770
2021-03-19 22:39:42 -07:00
Matthew Ahrens
330c6c0523
Clean up RAIDZ/DRAID ereport code
The RAIDZ and DRAID code is responsible for reporting checksum errors on
their child vdevs.  Checksum errors represent events where a disk
returned data or parity that should have been correct, but was not.  In
other words, these are instances of silent data corruption.  The
checksum errors show up in the vdev stats (and thus `zpool status`'s
CKSUM column), and in the event log (`zpool events`).

Note, this is in contrast with the more common "noisy" errors where a
disk goes offline, in which case ZFS knows that the disk is bad and
doesn't try to read it, or the device returns an error on the requested
read or write operation.

RAIDZ/DRAID generate checksum errors via three code paths:

1. When RAIDZ/DRAID reconstructs a damaged block, checksum errors are
reported on any children whose data was not used during the
reconstruction.  This is handled in `raidz_reconstruct()`.  This is the
most common type of RAIDZ/DRAID checksum error.

2. When RAIDZ/DRAID is not able to reconstruct a damaged block, that
means that the data has been lost.  The zio fails and an error is
returned to the consumer (e.g. the read(2) system call).  This would
happen if, for example, three different disks in a RAIDZ2 group are
silently damaged.  Since the damage is silent, it isn't possible to know
which three disks are damaged, so a checksum error is reported against
every child that returned data or parity for this read.  (For DRAID,
typically only one "group" of children is involved in each io.)  This
case is handled in `vdev_raidz_cksum_finish()`. This is the next most
common type of RAIDZ/DRAID checksum error.

3. If RAIDZ/DRAID is not able to reconstruct a damaged block (like in
case 2), but there happens to be additional copies of this block due to
"ditto blocks" (i.e. multiple DVA's in this blkptr_t), and one of those
copies is good, then RAIDZ/DRAID compares each sector of the data or
parity that it retrieved with the good data from the other DVA, and if
they differ then it reports a checksum error on this child.  This
differs from case 2 in that the checksum error is reported on only the
subset of children that actually have bad data or parity.  This case
happens very rarely, since normally only metadata has ditto blocks.  If
the silent damage is extensive, there will be many instances of case 2,
and the pool will likely be unrecoverable.

The code for handling case 3 is considerably more complicated than the
other cases, for two reasons:

1. It needs to run after the main raidz read logic has completed.  The
data RAIDZ read needs to be preserved until after the alternate DVA has
been read, which necessitates refcounts and callbacks managed by the
non-raidz-specific zio layer.

2. It's nontrivial to map the sections of data read by RAIDZ to the
correct data.  For example, the correct data does not include the parity
information, so the parity must be recalculated based on the correct
data, and then compared to the parity that was read from the RAIDZ
children.

Due to the complexity of case 3, the rareness of hitting it, and the
minimal benefit it provides above case 2, this commit removes the code
for case 3.  These types of errors will now be handled the same as case
2, i.e. the checksum error will be reported against all children that
returned data or parity.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11735
2021-03-19 16:22:10 -07:00
gldisater
07dff5cffe
Hold and release permissions exist
The man page was missing these two permissions.
Add the missing permissions to the man page. 

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jeremy Faulkner <gldisater@gldis.ca>
Closes #11727
2021-03-16 15:01:21 -07:00
Martin Matuška
b8fa03efbc
Fix whitespace introduced in ecc277cff
The manual page change in ecc277c has introduced whitespace on
line ends.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Martin Matuska <mm@FreeBSD.org>
Closes #11722
2021-03-11 19:42:04 -08:00