Matthew Ahrens [Wed, 6 Jan 2016 21:22:48 +0000 (22:22 +0100)]
OpenZFS 2605, 6980, 6902
2605 want to resume interrupted zfs send
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed by: Xin Li <delphij@freebsd.org>
Reviewed by: Arne Jansen <sensille@gmx.net>
Approved by: Dan McDonald <danmcd@omniti.com> Ported-by: kernelOfTruth <kerneloftruth@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/2605
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/9c3fd12
6980 6902 causes zfs send to break due to 32-bit/64-bit struct mismatch
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported by: Brian Behlendorf <behlendorf1@llnl.gov>
Porting notes:
- All rsend and snapshop tests enabled and updated for Linux.
- Fix misuse of input argument in traverse_visitbp().
- Fix ISO C90 warnings and errors.
- Fix gcc 'missing braces around initializer' in
'struct send_thread_arg to_arg =' warning.
- Replace 4 argument fletcher_4_native() with 3 argument version,
this change was made in OpenZFS 4185 which has not been ported.
- Part of the sections for 'zfs receive' and 'zfs send' was
rewritten and reordered to approximate upstream.
- Fix mktree xattr creation, 'user.' prefix required.
- Minor fixes to newly enabled test cases
- Long holds for volumes allowed during receive for minor registration.
Brian Behlendorf [Fri, 24 Jun 2016 21:50:20 +0000 (14:50 -0700)]
Sync DMU_BACKUP_FEATURE_* flags
Flag 20 was used in OpenZFS as DMU_BACKUP_FEATURE_RESUMING. The
DMU_BACKUP_FEATURE_LARGE_DNODE flag must be shifted to 21 and
then reserved in the upstream OpenZFS implementation.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov>
Closes #4795
Ned Bass [Thu, 17 Mar 2016 01:25:34 +0000 (18:25 -0700)]
Implement large_dnode pool feature
Justification
-------------
This feature adds support for variable length dnodes. Our motivation is
to eliminate the overhead associated with using spill blocks. Spill
blocks are used to store system attribute data (i.e. file metadata) that
does not fit in the dnode's bonus buffer. By allowing a larger bonus
buffer area the use of a spill block can be avoided. Spill blocks
potentially incur an additional read I/O for every dnode in a dnode
block. As a worst case example, reading 32 dnodes from a 16k dnode block
and all of the spill blocks could issue 33 separate reads. Now suppose
those dnodes have size 1024 and therefore don't need spill blocks. Then
the worst case number of blocks read is reduced to from 33 to two--one
per dnode block. In practice spill blocks may tend to be co-located on
disk with the dnode blocks so the reduction in I/O would not be this
drastic. In a badly fragmented pool, however, the improvement could be
significant.
ZFS-on-Linux systems that make heavy use of extended attributes would
benefit from this feature. In particular, ZFS-on-Linux supports the
xattr=sa dataset property which allows file extended attribute data
to be stored in the dnode bonus buffer as an alternative to the
traditional directory-based format. Workloads such as SELinux and the
Lustre distributed filesystem often store enough xattr data to force
spill bocks when xattr=sa is in effect. Large dnodes may therefore
provide a performance benefit to such systems.
Other use cases that may benefit from this feature include files with
large ACLs and symbolic links with long target names. Furthermore,
this feature may be desirable on other platforms in case future
applications or features are developed that could make use of a
larger bonus buffer area.
Implementation
--------------
The size of a dnode may be a multiple of 512 bytes up to the size of
a dnode block (currently 16384 bytes). A dn_extra_slots field was
added to the current on-disk dnode_phys_t structure to describe the
size of the physical dnode on disk. The 8 bits for this field were
taken from the zero filled dn_pad2 field. The field represents how
many "extra" dnode_phys_t slots a dnode consumes in its dnode block.
This convention results in a value of 0 for 512 byte dnodes which
preserves on-disk format compatibility with older software.
Similarly, the in-memory dnode_t structure has a new dn_num_slots field
to represent the total number of dnode_phys_t slots consumed on disk.
Thus dn->dn_num_slots is 1 greater than the corresponding
dnp->dn_extra_slots. This difference in convention was adopted
because, unlike on-disk structures, backward compatibility is not a
concern for in-memory objects, so we used a more natural way to
represent size for a dnode_t.
The default size for newly created dnodes is determined by the value of
a new "dnodesize" dataset property. By default the property is set to
"legacy" which is compatible with older software. Setting the property
to "auto" will allow the filesystem to choose the most suitable dnode
size. Currently this just sets the default dnode size to 1k, but future
code improvements could dynamically choose a size based on observed
workload patterns. Dnodes of varying sizes can coexist within the same
dataset and even within the same dnode block. For example, to enable
automatically-sized dnodes, run
# zfs set dnodesize=auto tank/fish
The user can also specify literal values for the dnodesize property.
These are currently limited to powers of two from 1k to 16k. The
power-of-2 limitation is only for simplicity of the user interface.
Internally the implementation can handle any multiple of 512 up to 16k,
and consumers of the DMU API can specify any legal dnode value.
The size of a new dnode is determined at object allocation time and
stored as a new field in the znode in-memory structure. New DMU
interfaces are added to allow the consumer to specify the dnode size
that a newly allocated object should use. Existing interfaces are
unchanged to avoid having to update every call site and to preserve
compatibility with external consumers such as Lustre. The new
interfaces names are given below. The versions of these functions that
don't take a dnodesize parameter now just call the _dnsize() versions
with a dnodesize of 0, which means use the legacy dnode size.
New DMU interfaces:
dmu_object_alloc_dnsize()
dmu_object_claim_dnsize()
dmu_object_reclaim_dnsize()
New ZAP interfaces:
zap_create_dnsize()
zap_create_norm_dnsize()
zap_create_flags_dnsize()
zap_create_claim_norm_dnsize()
zap_create_link_dnsize()
The constant DN_MAX_BONUSLEN is renamed to DN_OLD_MAX_BONUSLEN. The
spa_maxdnodesize() function should be used to determine the maximum
bonus length for a pool.
These are a few noteworthy changes to key functions:
* The prototype for dnode_hold_impl() now takes a "slots" parameter.
When the DNODE_MUST_BE_FREE flag is set, this parameter is used to
ensure the hole at the specified object offset is large enough to
hold the dnode being created. The slots parameter is also used
to ensure a dnode does not span multiple dnode blocks. In both of
these cases, if a failure occurs, ENOSPC is returned. Keep in mind,
these failure cases are only possible when using DNODE_MUST_BE_FREE.
If the DNODE_MUST_BE_ALLOCATED flag is set, "slots" must be 0.
dnode_hold_impl() will check if the requested dnode is already
consumed as an extra dnode slot by an large dnode, in which case
it returns ENOENT.
* The function dmu_object_alloc() advances to the next dnode block
if dnode_hold_impl() returns an error for a requested object.
This is because the beginning of the next dnode block is the only
location it can safely assume to either be a hole or a valid
starting point for a dnode.
* dnode_next_offset_level() and other functions that iterate
through dnode blocks may no longer use a simple array indexing
scheme. These now use the current dnode's dn_num_slots field to
advance to the next dnode in the block. This is to ensure we
properly skip the current dnode's bonus area and don't interpret it
as a valid dnode.
zdb
---
The zdb command was updated to display a dnode's size under the
"dnsize" column when the object is dumped.
For ZIL create log records, zdb will now display the slot count for
the object.
ztest
-----
Ztest chooses a random dnodesize for every newly created object. The
random distribution is more heavily weighted toward small dnodes to
better simulate real-world datasets.
Unused bonus buffer space is filled with non-zero values computed from
the object number, dataset id, offset, and generation number. This
helps ensure that the dnode traversal code properly skips the interior
regions of large dnodes, and that these interior regions are not
overwritten by data belonging to other dnodes. A new test visits each
object in a dataset. It verifies that the actual dnode size matches what
was stored in the ztest block tag when it was created. It also verifies
that the unused bonus buffer space is filled with the expected data
patterns.
ZFS Test Suite
--------------
Added six new large dnode-specific tests, and integrated the dnodesize
property into existing tests for zfs allow and send/recv.
Send/Receive
------------
ZFS send streams for datasets containing large dnodes cannot be received
on pools that don't support the large_dnode feature. A send stream with
large dnodes sets a DMU_BACKUP_FEATURE_LARGE_DNODE flag which will be
unrecognized by an incompatible receiving pool so that the zfs receive
will fail gracefully.
While not implemented here, it may be possible to generate a
backward-compatible send stream from a dataset containing large
dnodes. The implementation may be tricky, however, because the send
object record for a large dnode would need to be resized to a 512
byte dnode, possibly kicking in a spill block in the process. This
means we would need to construct a new SA layout and possibly
register it in the SA layout object. The SA layout is normally just
sent as an ordinary object record. But if we are constructing new
layouts while generating the send stream we'd have to build the SA
layout object dynamically and send it at the end of the stream.
For sending and receiving between pools that do support large dnodes,
the drr_object send record type is extended with a new field to store
the dnode slot count. This field was repurposed from unused padding
in the structure.
ZIL Replay
----------
The dnode slot count is stored in the uppermost 8 bits of the lr_foid
field. The bits were unused as the object id is currently capped at
48 bits.
Resizing Dnodes
---------------
It should be possible to resize a dnode when it is dirtied if the
current dnodesize dataset property differs from the dnode's size, but
this functionality is not currently implemented. Clearly a dnode can
only grow if there are sufficient contiguous unused slots in the
dnode block, but it should always be possible to shrink a dnode.
Growing dnodes may be useful to reduce fragmentation in a pool with
many spill blocks in use. Shrinking dnodes may be useful to allow
sending a dataset to a pool that doesn't support the large_dnode
feature.
Feature Reference Counting
--------------------------
The reference count for the large_dnode pool feature tracks the
number of datasets that have ever contained a dnode of size larger
than 512 bytes. The first time a large dnode is created in a dataset
the dataset is converted to an extensible dataset. This is a one-way
operation and the only way to decrement the feature count is to
destroy the dataset, even if the dataset no longer contains any large
dnodes. The complexity of reference counting on a per-dnode basis was
too high, so we chose to track it on a per-dataset basis similarly to
the large_block feature.
Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3542
Ned Bass [Tue, 17 May 2016 01:02:29 +0000 (01:02 +0000)]
Backfill metadnode more intelligently
Only attempt to backfill lower metadnode object numbers if at least
4096 objects have been freed since the last rescan, and at most once
per transaction group. This avoids a pathology in dmu_object_alloc()
that caused O(N^2) behavior for create-heavy workloads and
substantially improves object creation rates. As summarized by
@mahrens in #4636:
"Normally, the object allocator simply checks to see if the next
object is available. The slow calls happened when dmu_object_alloc()
checks to see if it can backfill lower object numbers. This happens
every time we move on to a new L1 indirect block (i.e. every 32 *
128 = 4096 objects). When re-checking lower object numbers, we use
the on-disk fill count (blkptr_t:blk_fill) to quickly skip over
indirect blocks that don’t have enough free dnodes (defined as an L2
with at least 393,216 of 524,288 dnodes free). Therefore, we may
find that a block of dnodes has a low (or zero) fill count, and yet
we can’t allocate any of its dnodes, because they've been allocated
in memory but not yet written to disk. In this case we have to hold
each of the dnodes and then notice that it has been allocated in
memory.
The end result is that allocating N objects in the same TXG can
require CPU usage proportional to N^2."
Add a tunable dmu_rescan_dnode_threshold to define the number of
objects that must be freed before a rescan is performed. Don't bother
to export this as a module option because testing doesn't show a
compelling reason to change it. The vast majority of the performance
gain comes from limit the rescan to at most once per TXG.
Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ned Bass [Fri, 10 Apr 2015 22:17:30 +0000 (15:17 -0700)]
xattrtest: allow verify with -R and other improvements
- Use a fixed buffer of random bytes when random xattr values are in
effect. This eliminates the potential performance bottleneck of
reading from /dev/urandom for each file. This also allows us to
verify xattrs in random value mode.
- Show the rate of operations per second in addition to elapsed time
for each phase of the test. This may be useful for benchmarking.
- Set default xattr size to 6 so that verify doesn't fail if user
doesn't specify a size. We need at least six bytes to store the
leading "size=X" string that is used for verification.
- Allow user to execute just one phase of the test. Acceptable
values for -o and their meanings are:
1 - run the create phase
2 - run the setxattr phase
3 - run the getxattr phase
4 - run the unlink phase
Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Brian Behlendorf [Fri, 24 Jun 2016 19:44:02 +0000 (12:44 -0700)]
Revert "Add a test case for dmu_free_long_range() to ztest"
This reverts commit d0de2e82df579f4e4edf5643b674a1464fae485f which
introduced a new test case to ztest which is failing occasionally
during automated testing. The change is being reverted until
the issue can be fully investigated.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4754
Paul Dagnelie [Sun, 15 May 2016 15:02:28 +0000 (08:02 -0700)]
OpenZFS 6513 - partially filled holes lose birth time
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Boris Protopopov <bprotopopov@hotmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>a
Ported by: Boris Protopopov <bprotopopov@actifio.com> Signed-off-by: Boris Protopopov <bprotopopov@actifio.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6513
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/8df0bcf0
If a ZFS object contains a hole at level one, and then a data block is
created at level 0 underneath that l1 block, l0 holes will be created.
However, these l0 holes do not have the birth time property set; as a
result, incremental sends will not send those holes.
Fix is to modify the dbuf_read code to fill in birth time data.
Chunwei Chen [Sat, 18 Jun 2016 00:36:01 +0000 (17:36 -0700)]
Fix NFS credential
The commit f74b821 caused a regression where creating file through NFS will
always create a file owned by root. This is because the patch enables the KSID
code in zfs_acl_ids_create, which it would use euid and egid of the current
process. However, on Linux, we should use fsuid and fsgid for file operations,
which is the original behaviour. So we revert this part of code.
The patch also enables secpolicy_vnode_*, since they are also used in file
operations, we change them to use fsuid and fsgid.
SIMD implementation of vdev_raidz generate and reconstruct routines
This is a new implementation of RAIDZ1/2/3 routines using x86_64
scalar, SSE, and AVX2 instruction sets. Included are 3 parity
generation routines (P, PQ, and PQR) and 7 reconstruction routines,
for all RAIDZ level. On module load, a quick benchmark of supported
routines will select the fastest for each operation and they will
be used at runtime. Original implementation is still present and
can be selected via module parameter.
Patch contains:
- specialized gen/rec routines for all RAIDZ levels,
- new scalar raidz implementation (unrolled),
- two x86_64 SIMD implementations (SSE and AVX2 instructions sets),
- fastest routines selected on module load (benchmark).
- cmd/raidz_test - verify and benchmark all implementations
- added raidz_test to the ZFS Test Suite
New zfs module parameters:
- zfs_vdev_raidz_impl (str): selects the implementation to use. On
module load, the parameter will only accept first 3 options, and
the other implementations can be set once module is finished
loading. Possible values for this option are:
"fastest" - use the fastest math available
"original" - use the original raidz code
"scalar" - new scalar impl
"sse" - new SSE impl if available
"avx2" - new AVX2 impl if available
See contents of `/sys/module/zfs/parameters/zfs_vdev_raidz_impl` to
get the list of supported values. If an implementation is not supported
on the system, it will not be shown. Currently selected option is
enclosed in `[]`.
Signed-off-by: Gvozden Neskovic <neskovic@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4328
Tim Chase [Thu, 16 Jun 2016 15:19:32 +0000 (10:19 -0500)]
Linux 4.6 compat: Fall back to d_prune_aliases() if necessary
As of 4.6, the icache and dcache LRUs are memcg aware insofar as the
kernel's per-superblock shrinker is concerned. The effect is that dcache
or icache entries added by a task in a non-root memcg won't be scanned
by the shrinker in the context of the root (or NULL) memcg. This defeats
the attempts by zfs_sb_prune() to unpin buffers and can allow metadata to
grow uncontrollably. This patch reverts to the d_prune_aliaes() method
in case the kernel's per-superblock shrinker is not able to free anything.
Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Closes: #4726
ZFS allows for specific permissions to be delegated to normal users
with the `zfs allow` and `zfs unallow` commands. In addition, non-
privileged users should be able to run all of the following commands:
Historically this functionality was not available on Linux. In order
to add it the secpolicy_* functions needed to be implemented and mapped
to the equivalent Linux capability. Only then could the permissions on
the `/dev/zfs` be relaxed and the internal ZFS permission checks used.
Even with this change some limitations remain. Under Linux only the
root user is allowed to modify the namespace (unless it's a private
namespace). This means the mount, mountpoint, canmount, unmount,
and remount delegations cannot be supported with the existing code. It
may be possible to add this functionality in the future.
This functionality was validated with the cli_user and delegation test
cases from the ZFS Test Suite. These tests exhaustively verify each
of the supported permissions which can be delegated and ensures only
an authorized user can perform it.
Two minor bug fixes were required for test-running.py. First, the
Timer() object cannot be safely created in a `try:` block when there
is an unconditional `finally` block which references it. Second,
when running as a normal user also check for scripts using the
both the .ksh and .sh suffixes.
Finally, existing users who are simulating delegations by setting
group permissions on the /dev/zfs device should revert that
customization when updating to a version with this change.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #362
Closes #434
Closes #4100
Closes #4394
Closes #4410
Closes #4487
As of perl v5.22.1 the following warnings are generated:
* Redundant argument in printf at scripts/cstyle.pl line 194
* Unescaped left brace in regex is deprecated, passed through
in regex; marked by <-- HERE in m/\S{ <-- HERE / at
scripts/cstyle.pl line 608.
They have been addressed by escaping the left braces and by
providing the correct number of arguments to printf based on
the fmt specifier set by the verbose option.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4723
Jinshan Xiong [Wed, 9 Dec 2015 23:34:16 +0000 (15:34 -0800)]
Implementation of AVX2 optimized Fletcher-4
New functionality:
- Preserves existing scalar implementation.
- Adds AVX2 optimized Fletcher-4 computation.
- Fastest routines selected on module load (benchmark).
- Test case for Fletcher-4 added to ztest.
New zcommon module parameters:
- zfs_fletcher_4_impl (str): selects the implementation to use.
"fastest" - use the fastest version available
"cycle" - cycle trough all available impl for ztest
"scalar" - use the original version
"avx2" - new AVX2 implementation if available
See contents of `/sys/module/zcommon/parameters/zfs_fletcher_4_impl`
to get list of supported values. If an implementation is not supported
on the system, it will not be shown. Currently selected option is
enclosed in `[]`.
Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4330
GeLiXin [Sat, 21 May 2016 03:34:06 +0000 (11:34 +0800)]
Fix self-healing IO prior to dsl_pool_init() completion
Async writes triggered by a self-healing IO may be issued before the
pool finishes the process of initialization. This results in a NULL
dereference of `spa->spa_dsl_pool` in vdev_queue_max_async_writes().
George Wilson recommended addressing this issue by initializing the
passed `dsl_pool_t **` prior to dmu_objset_open_impl(). Since the
caller is passing the `spa->spa_dsl_pool` this has the effect of
ensuring it's initialized.
However, since this depends on the caller knowing they must pass
the `spa->spa_dsl_pool` an additional NULL check was added to
vdev_queue_max_async_writes(). This guards against any future
restructuring of the code which might result in dsl_pool_init()
being called differently.
Signed-off-by: GeLiXin <47034221@qq.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4652
Brian Behlendorf [Wed, 25 May 2016 17:48:12 +0000 (10:48 -0700)]
Systemd configuration fixes
* Disable zfs-import-scan.service by default. This ensures that
pools will not be automatically imported unless they appear in
the cache file. When this service is explicitly enabled pools
will be imported with the "cachefile=none" property set. This
prevents the creation of, or update to, an existing cache file.
* Change services to dynamic from static by adding an [Install]
section and adding 'WantedBy' tags in favor of 'Requires' tags.
This allows for easier customization of the boot behavior.
* Start the zfs-import-cache.service after the root pivot so
the cache file is available in the standard location.
* Start the zfs-mount.service after the systemd-remount-fs.service
to ensure the root fs is writeable and the ZFS filesystems can
create their mount points.
* Change the default behavior to only load the ZFS kernel modules
in zfs-import-*.service or when blkid(8) detects a pool. Users
who wish to unconditionally load the kernel modules must uncomment
the list of modules in /lib/modules-load.d/zfs.conf.
Reviewed-by: Richard Laager <rlaager@wiktel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4325
Closes #4496
Closes #4658
Closes #4699
Tony Hutter [Mon, 23 May 2016 17:41:29 +0000 (10:41 -0700)]
OpenZFS 6531 - Provide mechanism to artificially limit disk performance
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>
Ported by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6531
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/97e8130
Porting notes:
- Added new IO delay tracepoints, and moved common ZIO tracepoint macros
to a new trace_common.h file.
- Used zio_delay_taskq() in place of OpenZFS's timeout_generic() function.
- Updated zinject man page
- Updated zpool_scrub test files
Tony Hutter [Wed, 25 May 2016 21:21:35 +0000 (14:21 -0700)]
Add request size histograms (-r) to zpool iostat, minor man page fix
Add -r option to "zpool iostat" to print request size histograms for the leaf
ZIOs. This includes histograms of individual ZIOs ("ind") and aggregate ZIOs
("agg"). These stats can be useful for seeing how well the ZFS IO aggregator
is working.
Also rename the stray "-G" in the man page to be "-w" for latency histograms.
Signed-off-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #4659
Chunwei Chen [Mon, 23 May 2016 18:58:21 +0000 (11:58 -0700)]
Fix arc_prune_task use-after-free
arc_prune_task uses a refcount to protect arc_prune_t, but it doesn't prevent
the underlying zsb from disappearing if there's a concurrent umount. We fix
this by force the caller of arc_remove_prune_callback to wait for
arc_prune_taskq to finish.
DHE [Wed, 30 Dec 2015 17:44:46 +0000 (12:44 -0500)]
Improve zfs-module-parameters(5)
Various rewrites to the descriptions of module parameters. Corrects
spelling mistakes, makes descriptions them more user-friendly and
describes some ZFS quirks which should be understood before changing
parameter values.
Signed-off-by: DHE <git@dehacked.net> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4671
Chunwei Chen [Fri, 20 May 2016 00:04:27 +0000 (17:04 -0700)]
Skip ctldir znode in zfs_rezget to fix snapdir issues
Skip ctldir in zfs_rezget, otherwise they will always get invalidated. This
will cause funny behaviour for the mounted snapdirs. Especially for
Linux >= 3.18, d_invalidate will detach the mountpoint and prevent anyone
automount it again as long as someone is still using the detached mount.
Brian Behlendorf [Fri, 20 May 2016 20:50:31 +0000 (13:50 -0700)]
Add missing RPM BuildRequires
Both libudev and libattr are recommended build requirements. As
such their development headers should lists in the rpm spec file
so those dependencies are pulled in when building rpm packages.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4676
Christer Ekholm [Mon, 23 May 2016 17:20:42 +0000 (19:20 +0200)]
Consistently use parsable instead of parseable
This is a purely cosmetical change, to consistently prefer one of
two (both acceptable) choises for the word parsable in documentation and
code. I don't really care which to use, but acording to wiktionary
https://en.wiktionary.org/wiki/parsable#English parsable is preferred.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4682
Christer Ekholm [Mon, 16 May 2016 19:29:54 +0000 (21:29 +0200)]
Make zpool list -vp print individual vdev sizes parsable.
Add argument format to print_one_column(), and use it to call
zfs_nicenum_format with, instead of just zfs_nicenum. Don't print "%"
for fragmentation or capacity percent values.
The calls to print_one_colum is made with ZFS_NICENUM_RAW if
cb->cb_literal (zpool list called with -p), and ZFS_NICENUM_1024 if not.
Also zpool_get_prop is modified to don't add "%" or "x" if literal.
Signed-off-by: Christer Ekholm <che@chrekh.se> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov
Closes #4657
Brian Behlendorf [Tue, 17 May 2016 22:31:03 +0000 (15:31 -0700)]
Remove additional cruft from manpages
These changes should have been part of the original 930b0d4
commit but were overlooked because 193a37c had not yet been
merged when the original change was ported.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4631
Marcel Huber [Wed, 11 May 2016 19:23:42 +0000 (21:23 +0200)]
Fixes subtle bug in zio_handle_io_delay()
Fixed bug introduced in commit #c35b1882. Hinted by gcc:
zio_inject.c: In function ‘zio_handle_io_delay’:
zio_inject.c:382:3: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
if (handler->zi_record.zi_freq != 0 &&
^~
zio_inject.c:384:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
continue;
^~~~~~~~
The zfs range lock interface no longer tightly depends on a
znode_t and therefore can be used in ztest. This allows the
previous ztest specific implementation to be removed, and for
additional test coverage of the shared version.
Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Boris Protopopov <boris.protopopov@actifio.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4023
Issue #4024
struct zvol_state contains a dummy znode, which is around 1KB on x64,
only for zfs_range_lock. But in reality, other than z_range_lock and
z_range_avl, zfs_range_lock only need znode on regular file, which
means we add 1KB on a structure and gain nothing.
In this patch, we remove the dummy znode for zvol_state. In order to
do that, we also need to refactor zfs_range_lock a bit. We move
z_range_lock and z_range_avl pair out of znode_t to form zfs_rlock_t.
This new struct replaces znode_t as the main handle inside the range
lock functions.
We also add pointers to z_size, z_blksz, and z_max_blksz so range lock
code doesn't depend on znode_t. This allows non-ZPL consumers like
Lustre to use the range locks with their equivalent znode_t structure.
Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Boris Protopopov <boris.protopopov@actifio.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4510
Richard Laager [Wed, 11 May 2016 19:16:21 +0000 (14:16 -0500)]
Illumos 1502 Remove conversion cruft from manpages
Reviewed by: Alexander Eremin <alexander.eremin@nexenta.com>
Reviewed by: Gordon Ross <gordon.w.ross@gmail.com>
Reviewed by: Garrett D'Amore <garrett.damore@gmail.com>
References:
https://www.illumos.org/issues/1502
Ported-by: Richard Laager <rlaager@wiktel.com> Signed-off-by: Richard Laager <rlaager@wiktel.com>
Conflicts:
man/man8/zpool.8
Userland version of cv_timedwait_hires() always assumes absolute time.
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported by: Denys Rtveliashvili <denys@rtveliashvili.name> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6739
OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/41c6413
Porting Notes:
The ported change has revealed a number of problems in the Linux-specific code,
as it was expecting incorrect return codes from pthread_* functions.
Reviewed and improved the usage of pthread_* function in lib/libzpool/kernel.c.
Chunwei Chen [Wed, 11 May 2016 23:55:48 +0000 (16:55 -0700)]
Use cv_timedwait_sig_hires in arc_reclaim_thread
The was originally using interruptible cv_timedwait_sig, but was changed
to uninterruptible cv_timedwait_hires in ae6d0c6. Use _sig_hires instead
to allow interruptible sleep.
- In older systems without sysroot.mount, import before dracut-mount,
and re-enable old dracut mount hook
- rootflags MUST be present even if the administrator neglected to
specify it explicitly
- Check that mount.zfs exists in sbindir
- Remove awk and head as (now unused) requirements, add grep, and
install the right mount.zfs
- Eliminate one use of grep in Dracut
- Use a more accurate grepping statement to identify zfsutil in rootflags
- Ensure that pooldev is nonempty
- Properly handle /dev/sd* devices and more
- Use new -P to get list of zpool devices
- Bail out of the generator when zfs:AUTO is on the root command line
- Ignore errors from systemctl trying to load sysroot.mount, we only
care about the output
- Determine which one is the correct initqueuedir at run time.
- Add a compatibility getargbool for our detection / setup script.
- Update dracut .gitignore files
Dan McDonald [Wed, 11 May 2016 19:03:51 +0000 (12:03 -0700)]
OpenZFS 6093 - zfsctl_shares_lookup
6093 zfsctl_shares_lookup should only VN_RELE() on zfs_zget() success
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com> Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6093
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/0f92170
Closes #4630
This function was always implemented slightly differently under Linux
and therefore never suffered from this issue. The patch has been
updated and applied as cleanup in order to minimize differences with
the upstream OpenZFS code.
Brian Behlendorf [Thu, 12 May 2016 20:31:55 +0000 (13:31 -0700)]
Revert "Kill znode->z_gen field"
This reverts commit 4cd77889b684fd0dd1a0a995b692dda3db76a9ac. The
i_generation field in the inode is 32-bit and the SA code expects
64-bit fixed values. Revert this optimization for now until
this is cleanly addressed.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4538
Tony Hutter [Mon, 29 Feb 2016 18:05:23 +0000 (10:05 -0800)]
Add -lhHpw options to "zpool iostat" for avg latency, histograms, & queues
Update the zfs module to collect statistics on average latencies, queue sizes,
and keep an internal histogram of all IO latencies. Along with this, update
"zpool iostat" with some new options to print out the stats:
Marcel Huber [Wed, 11 May 2016 19:28:33 +0000 (21:28 +0200)]
Fixes bug in fix_paths()
Fixes bug introduced in commit 7d90f569a. Hinted by gcc:
libzfs_import.c: In function ‘fix_paths’:
libzfs_import.c:602:28: warning: self-comparison always evaluates to true [-Wtautological-compare]
if (best->ne_num_labels == best->ne_num_labels &&
Nikolay Borisov [Mon, 9 May 2016 19:15:30 +0000 (22:15 +0300)]
Reduce stack usage of dmu_recv_stream function
The receive_writer_arg and receive_arg structures become large
when ZFS is compiled with debugging enabled. This results in
gcc throwing an error about excessive stack usage:
module/zfs/dmu_send.c: In function ‘dmu_recv_stream’:
module/zfs/dmu_send.c:2502:1: error: the frame size of 1256 bytes is
larger than 1024 bytes [-Werror=frame-larger-than=]
Fix this by allocating those functions on the heap, rather than
on the stack.
With patch: dmu_send.c:2350:1:dmu_recv_stream 240 static
Without patch: dmu_send.c:2350:1:dmu_recv_stream 1336 static
Signed-off-by: Nikolay Borisov <n.borisov.lkml@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4620
Adam Stevko [Mon, 9 May 2016 21:03:18 +0000 (14:03 -0700)]
OpenZFS 3993, 4700
3993 zpool(1M) and zfs(1M) should support -p for "list" and "get"
4700 "zpool get" doesn't support -H or -o options
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/3993
OpenZFS-issue: https://www.illumos.org/issues/4700
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/c58b352
Porting notes:
I removed ZoL's zpool_get_prop_literal() in favor of
zpool_get_prop(..., boolean_t literal) since that's what OpenZFS
uses. The functionality is the same.
Add a script designed to facilitate in-tree development and testing
by installing symlinks on your system which refer to in-tree helper
utilities. These helper utilities must be installed to in order to
exercise all ZFS functionality. By using symbolic links and keeping
the scripts in-tree during development they can be easily modified
and those changes tracked.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #4607
Chunwei Chen [Fri, 25 Mar 2016 19:21:56 +0000 (15:21 -0400)]
OpenZFS 6842 - Fix empty xattr dir causing lockup
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com> Ported-by: Denys Rtveliashvili <denys@rtveliashvili.name> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
An initial version of this patch was applied in commit 29572cc and
subsequently refined upstream. Since the implementations do not
conflict with each other both are left applied for now.
Authored by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com> Ported-by: Denys Rtveliashvili <denys@rtveliashvili.name> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
lzc_destroy_snaps() returns an nvlist in errlist.
zfs_destroy_snaps_nvl() should nvlist_free() it before returning.
Authored by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com> Ported-by: Denys Rtveliashvili <denys@rtveliashvili.name> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Incorrect endianness swap for drr_spill.drr_length in libzfs_sendrecv.c
Instead of drr_write.drr_length, we should be assigning the result of
the byteswap to drr_spill.drr_length.
Commit e0ab3ab introduced two blocks of code which are only needed
when debugging is enabled. These blocks should be wrapped with
ZFS_DEBUG for clarity and to prevent unused variable warnings in
a production build.
Signed-off-by: Don Brady <don.brady@intel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4515
Commit e0ab3ab introduced new per-vdev ZAP tests which should have
used the $ZPOOL and $ZDB variabled. The tests passed the automated
testing since both utilities but when running in-tree all of the new
tests fail.
Signed-off-by: Don Brady <don.brady@intel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4515
OpenZFS 6286 - ZFS internal error when set large block on bootfs
6286 ZFS internal error when set large block on bootfs
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Andriy Gapon <avg@FreeBSD.org>
Approved by: Robert Mustacchi <rm@joyent.com> Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6286
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/6de9bb5
Closes #4585
Tony Hutter [Thu, 5 May 2016 16:30:05 +0000 (09:30 -0700)]
OpenZFS 6544 - incorrect comment in libzfs.h about offline status
6544 incorrect comment in libzfs.h about offline status
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com> Ported-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/6544
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/cb605c4
Closes #4595
5669 altroot not set in zpool create when specified with -o
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com> Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://www.illumos.org/issues/5669
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/c423721
Closes #4594
Joe Stein [Mon, 11 Apr 2016 20:16:57 +0000 (16:16 -0400)]
OpenZFS 6736 - ZFS per-vdev ZAPs
6736 ZFS per-vdev ZAPs
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Don Brady <don.brady@intel.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Tim Chase [Mon, 2 May 2016 17:00:50 +0000 (12:00 -0500)]
Enable PF_FSTRANS for ioctl secpolicy callbacks (#4571)
At the very least, the zfs_secpolicy_write_perms ioctl security policy
callback, which calls dsl_dataset_hold(), can require freeing memory and,
therefore, re-enter ZFS. This patch enables PF_FSTRANS for all of the
security policy callbacks similarly to the manner in which it's enabled
for the actual ioctl callback.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4554
Brian Behlendorf [Sat, 30 Apr 2016 19:21:51 +0000 (12:21 -0700)]
Fix user namespaces uid/gid mapping
As described in torvalds/linux@5f3a4a2 the &init_user_ns, and
not the current user_ns, should be passed to posix_acl_from_xattr()
and posix_acl_to_xattr(). Conveniently the init_user_ns is
available through the init credential (kcred).
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Massimo Maggi <me@massimo-maggi.eu>
Closes #4177
Brian Behlendorf [Wed, 27 Apr 2016 00:24:41 +0000 (17:24 -0700)]
Add support for libtirpc
While OpenSolaris libc and glibc both include XDR support, the musl libc
does not in favor of depending on the BSD-licensed libtirpc library.
Adding support is a simple matter of detecting the library, including
the headers and linking against it. By default libtirpc will be checked
for and if available used. Otherwise, configure will fall back to using
the xdr implementation provided by libc if available. The options
--with-tirpc/--without-tirpc can be used to disable this checking.
In addition, the xdr_control() function has been simplied to only
handle ZFSs specific use case.
Original-patch-by: stf <s@ctrlc.hu> Original-patch-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Signed-off-by: Carlo Landmeter <clandmeter@gmail.com>
Closes #2254
Closes #4559
Alex Reece [Thu, 21 Apr 2016 18:23:37 +0000 (11:23 -0700)]
Illumos 6844 - dnode_next_offset can detect fictional holes
6844 dnode_next_offset can detect fictional holes
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
dnode_next_offset is used in a variety of places to iterate over the
holes or allocated blocks in a dnode. It operates under the premise that
it can iterate over the blockpointers of a dnode in open context while
holding only the dn_struct_rwlock as reader. Unfortunately, this premise
does not hold.
When we create the zio for a dbuf, we pass in the actual block pointer
in the indirect block above that dbuf. When we later zero the bp in
zio_write_compress, we are directly modifying the bp. The state of the
bp is now inconsistent from the perspective of dnode_next_offset: the bp
will appear to be a hole until zio_dva_allocate finally finishes filling
it in. In the meantime, dnode_next_offset can detect a hole in the dnode
when none exists.
I was able to experimentally demonstrate this behavior with the
following setup:
1. Create a file with 1 million dbufs.
2. Create a thread that randomly dirties L2 blocks by writing to the
first L0 block under them.
3. Observe dnode_next_offset, waiting for it to skip over a hole in the
middle of a file.
4. Do dnode_next_offset in a loop until we skip over such a non-existent
hole.
The fix is to ensure that it is valid to iterate over the indirect
blocks in a dnode while holding the dn_struct_rwlock by passing the zio
a copy of the BP and updating the actual BP in dbuf_write_ready while
holding the lock.
6659 nvlist_free(NULL) is a no-op
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Approved by: Robert Mustacchi <rm@joyent.com>
Brian Behlendorf [Wed, 20 Apr 2016 17:17:01 +0000 (10:17 -0700)]
Fix 'zpool import' blkid device names
When importing a pool using the blkid cache only the device
node path was added to the list of known paths for a device.
This results in 'zpool import' always using the sdX names
in preference to the 'path' name stored in the label.
To fix the issue the blkid import path has been updated to
add both the 'path', 'devid', and 'devname' names from the
label to the known paths. A sanity check is done to ensure
these paths do refer to the same device identified by blkid.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #4523
Closes #3043
Brian Behlendorf [Wed, 20 Apr 2016 18:39:15 +0000 (11:39 -0700)]
Disable efi_debug in --enable-debug builds
Disable the additional EFI debugging in all builds. Some users
run debug builds in production and the extra log messages can
cause confusion. Beyond that the log messages are rarely useful.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #4523
Brian Behlendorf [Tue, 19 Apr 2016 18:19:12 +0000 (11:19 -0700)]
Use udev for partition detection
When ZFS partitions a block device it must wait for udev to create
both a device node and all the device symlinks. This process takes
a variable length of time and depends on factors such how many links
must be created, the complexity of the rules, etc. Complicating
the situation further it is not uncommon for udev to create and
then remove a link multiple times while processing the udev rules.
Given the above, the existing scheme of waiting for an expected
partition to appear by name isn't 100% reliable. At this point
udev may still remove and recreate think link resulting in the
kernel modules being unable to open the device.
In order to address this the zpool_label_disk_wait() function
has been updated to use libudev. Until the registered system
device acknowledges that it in fully initialized the function
will wait. Once fully initialized all device links are checked
and allowed to settle for 50ms. This makes it far more likely
that all the device nodes will exist when the kernel modules
need to open them.
For systems without libudev an alternate zpool_label_disk_wait()
was updated to include a settle time. In addition, the kernel
modules were updated to include retry logic for this ENOENT case.
Due to the improved checks in the utilities it is unlikely this
logic will be invoked. However, if the rare event it is needed
it will prevent a failure.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Richard Laager <rlaager@wiktel.com>
Closes #4523
Closes #3708
Closes #4077
Closes #4144
Closes #4214
Closes #4517
Brian Behlendorf [Wed, 13 Apr 2016 21:50:16 +0000 (14:50 -0700)]
Create unique partition labels
When partitioning a device a name may be specified for each partition.
Internally zfs doesn't use this partition name for anything so it
has always just been set to "zfs".
However this isn't optimal because udev will create symlinks using
this name in /dev/disk/by-partlabel/. If the name isn't unique
then all the links cannot be created.
Therefore a random 64-bit value has been added to the partition
label, i.e "zfs-1234567890abcdef". Additional information could
be encoded here but since partitions may be reused that might
result in confusion and it was decided against.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Richard Laager <rlaager@wiktel.com>
Closes #4517
Matthew Thode [Wed, 30 Mar 2016 23:59:15 +0000 (18:59 -0500)]
fix booting via dracut generated initramfs
Dracut and Systemd updated how they integrate with each other, because
of this our current integrations stopped working (around the time
4.1.13 came out). This patch addresses that issue and gets us booting
again.
Thanks to @Rudd-O for doing the work to get dracut working again and
letting me submit this on his behalf.
Signed-off-by: Manuel Amador (Rudd-O) <rudd-o@rudd-o.com> Signed-off-by: Matthew Thode <mthode@mthode.org>
Closes #3605
Closes #4478
projects / zfs / log