On FreeBSD, linking the zfs kernel module with binutils ld 2.44 shows
the following warning:
ld: warning: aesni-gcm-avx2-vaes.o: missing .note.GNU-stack section
implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a
future version of the linker
Some of the `.S` files under `module/icp/asm-x86_64/modes` check whether
to emit the `.note.GNU-stack` section using:
#if defined(__linux__) && defined(__ELF__)
We could add `&& defined(__FreeBSD__)` to the test, but since all other
`.S` files in the OpenZFS tree use:
#ifdef __ELF__
it would seem more logical to use that instead. Any recent ELF platform
should support these note sections by now.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Dimitry Andric <dimitry@andric.com>
Closes#18119
ZFS send streams include a feature flag DMU_BACKUP_FEATURE_LARGE_BLOCKS
to indicate the presence of large blocks in the dataset. On the sending
side, this flag is included if the `-L` flag is passed to `zfs send`
and the feature is active in the dataset. On the receive side, the
stream is refused if the feature is active in the destination dataset
but the stream does not include the feature flag.
The problem is the feature is only activated when a large block is
born. If a large block has been born in the destination, but never
the source, the send can't work. This can arise when sending streams
back and forth between two datasets.
This commit fixes the problem by always activating the large blocks
feature when receiving a stream with the large block feature flag.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Austin Wise <AustinWise@gmail.com>
Closes#18105
Fix zfs_open() to skip zil_async_to_sync() for the snapshot, as it won't
have any transactions. zfsvfs->z_log is NULL for the snapshot.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Jitendra Patidar <jitendra.patidar@nutanix.com>
Closes#18091
Add a read-only dataset property, snapshots_changed_nsecs, which
exposes the nanosecond resolution version of snapshots_changed.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Wolfgang Hoschek <wolfgang.hoschek@mac.com>
Closes#17998Closes#18031
This commit adds handling for the STATX_CHANGE_COOKIE so that
we can properly surface the ZFS znode sequence to NFS clients via
knfsd.
If knfsd does not have STATX_CHANGE_COOKIE in statx result then
it will synthesize the NFS change_info4 structure and related
change4id values algorithmically based on the ctime value of the
file. Since internally ZFS is using ktime_get_coarse_real_ts64()
for the timestamp calculation here it introduces the possiblity
that the change will not increment the change4id of directories
/ files causing a failure in the client to invalidate its attr
cache (among other things). See RFC 8881 Section 10.8 for
discussion of how clients may implement name and directory
caching.
Notable in this commit is that we are not initializing the
inode->i_version to the znode->z_seq number. The reason for this
is that we're intentionally not setting `SB_I_VERSION`. This
indicates that the filesystem manages its own i_version and
so it is not populated in the generic_fillattr.
The following compares tight loop of setattr over NFSv4
protocol while traching nfsd4_change_attribute.
Before change:
inode, change_attribute
4723, 7590032215978780890
4723, 7590032215978780890
4723, 7590032215978780890
4723, 7590032215982780865
4723, 7590032215982780865
After change:
inode, change_attribute
7602, 7590032992517123951
7602, 7590032992517123952
7602, 7590032992517123953
7602, 7590032992517123954
7602, 7590032992517123955
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Andrew Walker <andrew.walker@truenas.com>
Closes#18097
vmalloc()'d memory is not movable/reclaimable, so __GFP_RECLAIMABLE is
not a valid flag, and since 6.19 the kernel warns if you use it.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18107
It hasn't been necessary since Linux 3.13
(torvalds/linux@a57a49887e), and since 6.19 the kernel warns if you
use it.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18053
Since Linux 4.12 (torvalds/linux@19809c2da2) __GFP_HIGHMEM has been
automatically added to calls to __vmalloc() internally, so we don't need
it anymore. This is good, because since 6.19 the kernel warns if you use
__GFP_HIGHMEM.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18053
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18053
Now that it's built into the main zfs module in all cases, there's no
reason to put it in its own dir.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18071
Scan time limits do not need precision beyond 1ms. Switching
scn_sync_start_time and spa_sync_starttime from gethrtime() to
getlrtime() saves ~3% of CPU time during resilver scan stage.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18061
With higher throughput and lower latency of modern devices ZFS can
happily live with pretty short (fractions of a second) TXGs. But
the two decade old multi-second minimal time limits can almost stop
payload writes by extending TXGs beyond dirty data limits of ARC
ability to amortize it.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18060
If the file already has more than one block, then the current
block size cannot change. But if the file block size is less
than the maximum block size supported by the file system, and
there are multiple blocks in the file, the current code will
almost always extend the rangelock to its maximum size.
This means that all writes become serialized and even reads
are slowed as they will more often contend with writes. This
commit adjusts the test so that we will not lock the entire
range if there is more than one block in the file already.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Mark Maybee <mark.maybee@perforce.com>
Closes#18046Closes#18064
This improves synthetic 1 byte write speed by ~2.5%.
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18063
There were some per I/O logging into dbgmsg in RAIDZ code, that
increased CPU load and wiped useful content out of dbgmsg, for
example during routine disk replacement process. I don't think
we need it to be that verbose.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18059
The first byte of the entry after compression is used for algorithm
and byte order flag. We should decrement when calling compression/
decompression algorithm.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18055
Unlike other ZAP consumers due to compression DDT does not know
how big entry it is reading from ZAP. Due to this it called
zap_length_uint64_by_dnode() and zap_lookup_uint64_by_dnode(),
each of which does full ZAP entry lookup.
Introduction of the combined ZAP method dramatically reduces the
CPU overhead and locks contention at DBUF layer.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18048
As was previously done for BRT, avoid holding/releasing DDT ZAP
dnodes for every access. Instead hold the dnodes during all their
life time, never releasing.
While at this, add _by_dnode() interfaces for zap_length_uint64()
and zap_count(), actively used by DDT code.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18047
Postponing entry removal from the DDT log in case of hit till later
single-threaded sync stage allows to make ddl_tree stable during
multi-threaded ZIO processing stage. It allows to drop the DDT lock
before the search instead of after, reducing the contention a lot.
Actually ddt_log_update_entry() was already handling the case of
entry present in the active log, so we only need to remove it from
flushing log, if the entry happen to be there.
My tests with parallel 4KB block writes show throughput increase
from 480MB/s (122K blocks/s) to 827MB/s (212K blocks/s), even
though still limited by the global DDT lock contention.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18044
Previous code effectively enforced that all async free ZIOs were
_issued_ within the TXG timeout. But they could take forever to
complete, especially if the required metadata were not in ARC.
This patch introduces periodic waits every 2000 ZIOs, which should
give at least somewhat reasonable TXG timings even for single HDD
pools with empty ARC. And makes them complete within half of the
TXG timeout, since we might still need time to sync DDT and BRT.
While there, change zfs_max_async_dedup_frees semantics to include
also clone and gang blocks, which are similar. Bump the default
value from set long ago to be more forgiving to block cloning
(still not having logs and benefiting from large TXGs), now that
we have better working time limits. The limit now is a possible
amount of dirty data produced by BRT updates.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18043
We've observed a number of cases when pool import stuck for many
minutes due to large async destroy trying to load DDT or BRT from
HDD pool. While proper destroy dosage is a separate problem,
lets give import process a chance to complete before that at all.
It may be not enough if there is a lot of ZIL to replay, but that
is harder to cover, since those are in separate syscalls.
Code investigation shown that we already have this mechanism used
for scrub/resilver, so this patch converts SCAN_IMPORT_WAIT_TXGS
into a tunable and applies it to async destroys also.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18033
Before parallel eviction implementation zfs_arc_evict_batch_limit
caused loop exits after evicting 10 headers. The cost of it is not
big and well motivated. Now though taskq task exit after the same
10 headers is much more expensive. To cover the context switch
overhead of taskq introduce another level of batching, controlled
by zfs_arc_evict_batches_limit tunable, used only for parallel
eviction.
My tests including 36 parallel reads with 4KB recordsize that shown
1.4GB/s (~460K blocks/s) before with heavy arc_evict_lock contention,
now show 6.5GB/s (~1.6M blocks/s) without arc_evict_lock contention.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17970
We may not be able to avoid our code referencing the symbol, but we can
ensure that a symbol of that name is available to the linker during
build, and so not require linking the GPL-exported version.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#18009Closes#18040
In zio_ddt_free, if a pruned dde is still in ddt, it would do nothing
and cause space leak.
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes#17982Closes#17983
Compilation time bug introduced by 87df5e4 commit.
Fix for the compilation error(Linux kernel 6.18.0):
"zfs/module/os/linux/zfs/abd_os.c:920:32: error: implicit declaration
of function ‘nth_page’; did you mean ‘pte_page’?
[-Werror=implicit-function-declaration]".
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: agiUnderground <alex.dev.cv@gmail.com>
Closes#18034
There is no need to do MSEC_TO_TICK() for each evicted ARC header.
We can do it when tunables are set, since we already have separate
internal variables for those.
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17965
For each block written or freed ZFS dirties ds_dbuf of the dataset.
While dbuf_dirty() has a fast path for already dirty dbufs, it still
require taking the lock and doing some things visible in profiler.
Investigation shown ds_dbuf dirtying by dsl_dataset_block_born()
and some of dsl_dataset_block_kill() are just not needed, since
by the time they are called in sync context the ds_dbuf is already
dirtied by dsl_dataset_sync().
Tests show this reducing large file deletion time by ~3% by saving
CPU time of single-threaded part of the sync thread.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#18028
Fix another instance where ZFS assumes multiple pages can be
mapped at once via zfs_kmap_local(), resulting in crashes and
potential memory corruption on HIGHMEM-enabled (typically 32-bit)
systems.
Reviewed-by: RageLtMan <rageltman@sempervictus>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: bspengler-oss <94915855+bspengler-oss@users.noreply.github.com>
Closes#15668Closes#18030
ZFS typically preserves proper LIFO ordering regarding map/unmap
operations that wrap the Linux kernel's kmap interfaces that
require such ordering, but one instance in abd_raidz_gen_iterate()
did not.
Similar issues have been fixed in the Linux kernel in the past,
see for instance CVE-2025-39899 for userfaultfd.
Reviewed-by: RageLtMan <rageltman@sempervictus>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: bspengler-oss <94915855+bspengler-oss@users.noreply.github.com>
Closes#15668Closes#18030
HIGHMEM kmap interfaces operate on only a single page at a time
yet ZFS hadn't accounted for this, resulting in crashes and
potential memory corruption on HIGHMEM (typically 32-bit) systems.
This was caught by PaX's KERNSEAL feature as it makes use of
HIGHMEM functionality on x64.
On typical 64-bit systems, this issue wouldn't have been observed,
as the map interfaces simply fall back to returning an address in
lowmem where the contiguous pages can be accessed directly.
Joint work with the PaX Team, tested by Mark van Dijk
Reviewed-by: RageLtMan <rageltman@sempervictus>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: bspengler-oss <94915855+bspengler-oss@users.noreply.github.com>
Closes#15668Closes#18030
Multiple threads racing to automount the same snapshot can both spawn
mount helper processes that successfully complete, causing both parent
threads to attempt AVL tree registration and triggering a VERIFY()
panic in avl_add(). This occurs because the fsconfig/fsmount API lacks
the serialization provided by traditional mount() via lock_mount().
The fix adds a per-entry mutex (se_mtx) to zfs_snapentry_t that
serializes mount and unmount operations on the same snapshot. The first
mount thread creates a pending entry with se_spa=NULL and holds se_mtx
during the helper execution. Concurrent mounts find the pending entry
and return success without spawning duplicate helpers. Unmount waits on
se_mtx if a mount is pending, ensuring proper serialization. This allows
different snapshots to mount in parallel while preventing the AVL panic.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes#17943
In general it's possible for a vnode to not have an associated VM
object. This happens in particular with named pipes, which have
some distinct VOPs, defined in zfs_fifoops. Thus, this chunk of
zfs_freebsd_fsync() needs to check for the FIFO case, like other
vm_object_mightbedirty() callers do.
(Note that vn_flush_cached_data() calls are predicated on
zn_has_cached_data() returning true, and it checks for a NULL v_object
pointer already.)
Fixes: ef4058fcdc
Reported-by: Collin Funk <collin.funk1@gmail.com>
Reviewed-by: Sean Eric Fagan <sef@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes#18015
A deadlock occurs when snapshot expiry tasks are cancelled while holding
locks. The snapshot expiry task (snapentry_expire) spawns an umount
process and waits for it to complete. Concurrently, ARC memory pressure
triggers arc_prune which calls zfs_exit_fs(), attempting to cancel the
expiry task while holding locks. The umount process spawned by the
expiry task blocks trying to acquire locks held by arc_prune, which is
blocked waiting for the expiry task to complete. This creates a circular
dependency: expiry task waits for umount, umount waits for arc_prune,
arc_prune waits for expiry task.
Fix by adding non-blocking cancellation support to taskq_cancel_id().
The zfs_exit_fs() path calls zfsctl_snapshot_unmount_delay() to
reschedule the unmount, which needs to cancel any existing expiry task.
It now uses non-blocking cancellation to avoid waiting while holding
locks, breaking the deadlock by returning immediately when the task is
already running.
The per-entry se_taskqid_lock has been removed, with all taskqid
operations now protected by the global zfs_snapshot_lock held as
WRITER. Additionally, an se_in_umount flag prevents recursive waits when
zfsctl_destroy() is called during unmount. The taskqid is now only
cleared by the caller on successful cancellation; running tasks clear
their own taskqid upon completion.
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes#17941
Before this change DDT lock was taken 4 times per written block,
and as effectively a pool-wide lock it can be highly congested.
This change introduces a new per-entry dde_io_lock, protecting some
fields during I/O ready and done stages, so that we don't need the
global lock there.
According to my write tests on 64-thread system with 4KB blocks this
significantly reduce the global lock contention, reducing CPU usage
from 100% to expected ~80%, and increasing write throughput by 10%.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17960
ddt_lookup() is a very busy code under a highly congested global
lock. Anything we can save here is very important.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17980
Even though unlike gang children it is not so critical for dedup
children to inherit parent's allocator, there is still no reason
for them to have allocation policy different from normal writes.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17961
Linux switched from -std=gnu89 to -std=gnu11 in 5.18
(torvalds/linux@e8c07082a8). We've always overridden that with gnu99
because we use some newer features.
More recent kernels are using C11 features in headers that we include.
GCC generally doesn't seem to care, but more recent versions of Clang
seem to be enforcing our gnu99 override more strictly, which breaks the
build in some configurations.
Just bumping our "override" to match the kernel seems to be the easiest
workaround. It's an effective no-op since 5.18, while still allowing us
to build on older kernels.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#17954
Remove unsafe timer_pending() check in taskq_cancel_id() that created a
race where:
- Timer expires and timer_pending() returns FALSE
- task_done() frees task with tqent_func = NULL
- Timer callback executes and queues freed task
- Worker thread crashes executing NULL function
Always call timer_delete_sync() unconditionally to ensure timer callback
completes before task is freed.
Reliably reproducible by injecting mdelay(10) after setting CANCEL flag
to widen the race window, combined with frequent task cancellations
(e.g., snapshot automount expiry).
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes#17942
Only include the required icp headers. There's no need to
include sys/zfs_context.h and pull in all of the zfs headers.
Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#17861
Pull all of the internal debug infrastructure up in to the zfs
code to clean up the layering. Remove all the dodgy usage of
SET_ERROR and DTRACE_PROBE from the spl. Luckily it was
lightly used in the spl layer so we're not losing much.
Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes#17861
Introduce a new vdev property `VDEV_PROP_SLOW_IO_REPORTING` that
allows users to disable notifications for slow devices.
This prevents ZED and/or ZFSD from degrading the pool due to slow
I/O.
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Mariusz Zaborski <oshogbo@FreeBSD.org>
Closes 17477
Implement BRT (Block Reference Table) prefetch functionality similar
to existing DDT prefetch. This allows preloading BRT metadata into
ARC to improve performance for block cloning operations and frees
of earlier cloned blocks.
Make -t parameter optional. When omitted, prefetch all supported
metadata types (both DDT and BRT now).
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17890
According to my observations, BRT ZAPs are typically compressible
3:1 for data and 2:1 for indirects. With ashift=12, typical these
days, it means increasing the block sizes to 8KB we may get most
of possible compression, reducing on-disk and in-ARC BRT footprint
in half by the cost of some compression/decompression overhead,
but without real write inflation, only some dirty data increase.
Increase to 32KB similar to DDT could further increase compression
and storage efficiency, but at the cost of write inflation and
much bigger dirty data increase, which we can not properly control
now. So lets leave this for a time when BRT log gets implemented.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17916
dmu_object_info_from_dnode() takes two locks and copies plenty of
data that we don't need in zap_lockdir_impl(). Just read dn_type
directly in this hot path.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17921
This is useful as debugging support, as it lets namespace lock
operations be traced directly. It will also be useful for future work to
reduce the use of spa_namespace_lock, traditionally a source of
difficult deadlocks.
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes#17906
Free issue threads might block waiting for synchronous DDT, BRT or
GANG header reads. So unlike other taskqs using ZTI_SCALE to scale
with number of CPUs, here we also need some amount of threads to
potentially saturate pool reads. I am not sure we always want the
96 threads we had before ZTI_SCALE introduction at #11966 on small
systems, but lets make it at least 32.
While here, make free taskqs configurable, similar to read and
write ones.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes#17903
FreeBSD now has a pathconf name called _PC_CASE_INSENSITIVE
used to check if a file system performs case insensitive
name lookups.
This patch adds support for this name.
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rick Macklem <rmacklem@uoguelph.ca>
Closes#17908
