Don't even try to read vdev labels from devices smaller then SPA_MINDEVSIZE
(64MB). Even if we would find one somehow, ZFS kernel code rejects such
devices. It is funny to look on attempts to read 4 256K vdev labels from
1.44MB floppy, though it is not very practical and quite slow.
don't make sense on FreeBSD. In particular,
- remove the ATTRIBUTES section,
- remove references to the Solaris Dynamic Tracing Guide, except in the
SEE ALSO section,
- update the description of the -A option for FreeBSD's implementation,
- remove references to Solaris-specific programs and configuration files,
and replace them with FreeBSD equivalents where possible.
The content has not changed aside from this.
Approved by: re (joel)
MFC after: 1 week
Add support of Illumos dumps on zvol over RAID-Z.
Note that this only adds the features. FreeBSD would
still need more work to support dumping on zvols.
Illumos ZFS issues:
2932 support crash dumps to raidz, etc. pools
MFC after: 1 month
Approved by: re (ZFS blanket)
Illumos ZFS issues:
3582 zfs_delay() should support a variable resolution
3584 DTrace sdt probes for ZFS txg states
Provide a compatibility shim for Solaris's cv_timedwait_hires
to help aid future porting.
Approved by: re (ZFS blanket)
2942 CTF tools need to handle files which legitimately lack data
2978 ctfconvert still needs to ignore legitimately dataless files on SPARC
Illumos Revisions: 13745:6b3106b4250f
13754:7231b684c18b
Reference:
https://www.illumos.org/issues/2942https://www.illumos.org/issues/2978
MFC after: 3 weeks
Don't treat the parameter as a number (pool GUID) when there is
error converting it from string, instead, treat it as the pool
name.
Illumos ZFS issues:
1765 assert triggered in libzfs_import.c trying to import pool
name beginning with a number
To quote original Illumos ticket:
libctf thinks that any ELF file containing more than 65536 sections is
corrupt, because it doesn't understand the SHN_XINDEX magic.
Illumos DTrace issues:
4005 libctf can't deal with extended sections
Illumos DTrace issues:
3089 want ::typedef
3094 libctf should support removing a dynamic type
3095 libctf does not validate arrays correctly
3096 libctf does not validate function types correctly
minimum allocation size for devices. Use this information to
automatically increase ZFS's minimum allocation size for new top-level
vdevs to a value that more closely matches the optimum device
allocation size.
Use GEOM's stripesize attribute, if set, as the physical sector
size of the GEOM.
Calculate the minimum blocksize of each metaslab class. Use the
calculated value instead of SPA_MINBLOCKSIZE (512b) when determining
the likelyhood of compression yeilding a reduction in physical space
usage.
Report devices with sub-optimal block size configuration in "zpool
status". Also properly fail attempts to attach devices with a
logical block size greater than 8kB, since this will cause corruption
to ZFS's label area.
Sponsored by: Spectra Logic Corporaion
MFC after: 2 weeks
Background
==========
Many modern devices use physical allocation units that are much
larger than the minimum logical allocation size accessible by
external commands. Two prevalent examples of this are 512e disk
drives (512b logical sector, 4K physical sector) and flash devices
(512b logical sector, 4K or larger allocation block size, and 128k
or larger erase block size). Operations that modify less than the
physical sector size result in a costly read-modify-write or garbage
collection sequence on these devices.
Simply exporting the true physical sector of the device to ZFS would
yield optimal performance, but has two serious drawbacks:
1) Existing pools created with devices that have different logical
and physical block sizes, but were configured to use the logical
block size (e.g. because the OS version used for pool construction
reported the logical block size instead of the physical block
size) will suddenly find that the vdev allocation size has
increased. This can be easily tolerated for active members of
the array, but ZFS would prevent replacement of a vdev with
another identical device because it now appears that the smaller
allocation size required by the pool is not supported by the new
device.
2) The device's physical block size may be too large to be supported
by ZFS. The optimal allocation size for the vdev may be quite
large. For example, a RAID controller may export a vdev that
requires read-modify-write cycles unless accessed using 64k
aligned/sized requests. ZFS currently has an 8k minimum block
size limit.
Reporting both the logical and physical allocation sizes for vdevs
solves these problems. A device may be used so long as the logical
block size is compatible with the configuration. By comparing the
logical and physical block sizes, new configurations can be optimized
and administrators can be notified of any existing pools that are
sub-optimal.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/spa.h:
Add the SPA_ASHIFT constant. ZFS currently has a hard upper
limit of 13 (8k) for ashift and this constant is used to
both document and enforce this limit.
sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h:
Add the VDEV_AUX_ASHIFT_TOO_BIG error code.
Add fields for exporting the configured, logical, and
physical ashift to the vdev_stat_t structure.
Add VDEV_STAT_VALID() macro which can be used to verify the
presence of required vdev_stat_t fields in nvlist data.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:
Provide a SYSCTL_PROC handler for "max_auto_ashift". Since
the limit is only referenced long after boot when a create
operation occurs, there's no compelling need for it to be
a boot time configurable tunable. This also allows the
validation code for the max_auto_ashift value to be contained
within the sysctl handler.
Populate the new fields in the vdev_stat_t structure.
Fail vdev opens if the vdev reports an ashift larger than
SPA_MAXASHIFT.
Propogate vdev_logical_ashift and vdev_physical_ashift between
child and parent vdevs as is done for vdev_ashift.
In vdev_open(), restore code that fails opens for devices
where vdev_ashift grows. This can only happen now if the
device's logical ashift grows, which means it really isn't
safe to use the device.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_file.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_raidz.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_root.c:
Update the vdev_open() API so that both logical (what was
just ashift before) and physical ashift are reported.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h:
Add two new fields, vdev_physical_ashift and vdev_logical_ashift,
to vdev_t.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c:
Add vdev_ashift_optimize(). Call it anytime a new top-level
vdev is allocated.
cddl/contrib/opensolaris/cmd/zpool/zpool_main.c:
Add text for the VDEV_AUX_ASHIFT_TOO_BIG error.
For each sub-optimally configured leaf vdev, report configured
and native block sizes.
cddl/contrib/opensolaris/cmd/zpool/zpool_main.c:
cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h:
cddl/contrib/opensolaris/lib/libzfs/common/libzfs_status.c:
Introduce a new zpool status: ZPOOL_STATUS_NON_NATIVE_ASHIFT.
This status is reported on healthy pools containing vdevs
configured to use a block size smaller than their reported
physical block size.
cddl/contrib/opensolaris/lib/libzfs/common/libzfs_status.c:
Update find_vdev_problem() and supporting functions to
provide the full vdev_stat_t structure to problem checking
routines, and to allow decent into replacing vdevs.
Add a vdev_non_native_ashift() validator which is used on
the full vdev tree to check for ZPOOL_STATUS_NON_NATIVE_ASHIFT.
cddl/contrib/opensolaris/lib/libzpool/common/kernel.c:
cddl/contrib/opensolaris/lib/libzpool/common/sys/zfs_context.h:
Enhance sysctl userland stubs now that a SYSCTL_PROC handler
is used in vdev.c.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/metaslab_impl.h:
When the group membership of a metaslab class changes (i.e.
when a vdev is added or removed from a pool), walk the group
list to determine the smallest block size currently available
and record this in the metaslab class.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/metaslab.h:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c:
Add the metaslab_class_get_minblocksize() accessor.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zio_compress.h:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio_compress.c:
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:
In zio_compress_data(), take the minimum blocksize as an
input parameter instead of assuming SPA_MINBLOCKSIZE.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:
In l2arc_compress_buf(), pass SPA_MINBLOCKSIZE as the minimum
blocksize of the device. The l2arc code performs has it's own
code for deciding if compression is worth while, so this
effectively disables zio_compress_data() from second guessing
the original decision.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:
In zio_write_bp_init(), use the minimum blocksize of the
normal metaslab class when compressing data.
Illumos ZFS issues:
3957 ztest should update the cachefile before killing itself
3958 multiple scans can lead to partial resilvering
3959 ddt entries are not always resilvered
3960 dsl_scan can skip over dedup-ed blocks if
physical birth != logical birth
3961 freed gang blocks are not resilvered and can cause pool to suspend
3962 ztest should print out zfs debug buffer before exiting
Fix a regression introduced by fix for Illumos bug #3834. Quote from
Matthew Ahrens on the Illumos issue:
ztest fails this assertion because ztest_dmu_read_write() does
dmu_tx_hold_free(tx, bigobj, bigoff, bigsize);
and then
dmu_object_set_checksum(os, bigobj,
(enum zio_checksum)ztest_random_dsl_prop(ZFS_PROP_CHECKSUM), tx);
If the region to free is past the end of the file, the DMU assumes that there
will be nothing to do for this object. However, ztest does set_checksum(),
which must modify the dnode. The fix is for ztest to also call
dmu_tx_hold_bonus(tx, bigobj);
so we can account for the dirty data associated with setting the checksum
Illumos ZFS issues:
3955 ztest failure: assertion refcount_count(&tx->tx_space_written)
+ delta <= tx->tx_space_towrite
Merge vendor bugfix for ZFS test suite that triggers false positives.
Illumos ZFS issues:
3949 ztest fault injection should avoid resilvering devices
3950 ztest: deadman fires when we're doing a scan
3951 ztest hang when running dedup test
3952 ztest: ztest_reguid test and ztest_fault_inject don't place nice together
Fix zfs send -D hang after processing requiring a CTRL+C to interrupt due to
pthread_join prior to fd close.
This was introduced by r251646 (MFV r251644)
Illumos ZFS issue:
3909 "zfs send -D" does not work
MFC after: 1 day
Bring back some important fixes from Illumos:
3022 DTrace: keys should not affect the sort order when sorting by value
3023 it should be possible to dereference dynamic variables
3024 D integer narrowing needs some work
We particularly avoid the LD_NOLAZYLOAD changes that Illumos made
as those don't apply to FreeBSD and were causing problems in
interactive mode.
Illumos Revision: 13758:23432da34147
Reference:
https://www.illumos.org/issues/3022https://www.illumos.org/issues/3023https://www.illumos.org/issues/3024
MFC after: 1 month
Tested by: markj
GCC can generate bogus dwarf attributes with DW_AT_byte_size
set to 0xFFFFFFFF.
The issue was originaly detected in NetBSD but it has been
adapted for portability and to avoid compiler warnings.
Reference:
https://www.illumos.org/issues/3776
Obtained from: NetBSD
MFC after: 1 month
Restore a previous behavior before r251646, where when destructing
ZFS snapshot, the ioctl would return ENOENT when it hit any of
them in the errlist (the new behavior was only return ENOENT when
all returns error).
Illumos ZFS issues:
3829 fix for 3740 changed behavior of zfs destroy/hold/release ioctl
MFC after: 1 week
zpool create should treat -O mountpoint and -m the same
Illumos ZFS issues:
3745 zpool create should treat -O mountpoint and -m the same
MFC after: 2 weeks
seven arguments.
The original test uses Solaris' uadmin system call to trigger the test
probe; this change adds a sysctl to the dtrace_test module and gets the test
program to trigger the test probe via the sysctl handler.
The test is currently failing on amd64 because of some bugs in the way that
probe arguments beyond the first five are obtained - these bugs will be
fixed in a separate change.
dt_cg_ptrsize() and generally cleans up some of the error handling around
register allocation.
This change corresponds to part of illumos-gate commit e5803b76927480:
3025 register leak in D code generation
Reviewed by: pfg
Obtained from: illumos
MFC after: 1 month
FreeBSD. In the IPv6 case, try each interface before returning an error;
each IPv6-enabled interface will have a link-local address even if the link
isn't up.
MFC after: 1 week
users to guarantee that the output of DTrace scripts will be time-ordered.
This option is enabled by adding the line
#pragma D option temporal
to the beginning of a script, or by adding '-x temporal' to the arguments of
dtrace(1).
This change fixes a bug in the original port of the temporal option. This
bug was causing some assertions to fail, so they had been disabled; in this
revision the assertions are working properly and are enabled.
The DTrace version number has been bumped from 1.9.0 to 1.9.1 to reflect
the language change that's being introduced.
This change corresponds to part of illumos-gate commit e5803b76927480:
3021 option for time-ordered output from dtrace(1M)
Reviewed by: pfg
Obtained from: illumos
MFC after: 1 month
USDT probes are advertised to kernel by initialization code with
atrribute((constructor))). It seems that on Solaris the .init-ish code
of the main object is executed before RD_PREINIT point is hit. On
FreeBSD that is not the case. And because on FreeBSD there is no other
well-defined point between RD_PREINIT and main() we have to parse a
DTrace script when main is hit, for time being.
A footnote: currently we actually post RD_POSTINIT event, but that's a
bug because the event is triggered by hitting r_debug_state which
happens before any init code is executed.
Reported by: markj
snapshot.
Related illumos ZFS issue:
3699 zfs hold or release of a non-existent snapshot does not output error
Reported by: Steven Hartland <smh@FreeBSD.org>
MFC after: 3 days
The following change from illumos brought caused DTrace to
pause in an interactive environment:
3026 libdtrace should set LD_NOLAZYLOAD=1 to help the pid provider
This was not detected during testing because it doesn't
affect scripts.
We shouldn't be changing the environment, especially since the
LD_NOLAZYLOAD option doesn't apply to our (GNU) ld.
Unfortunately the change from upstream was made in such a way
that it is very difficult to separate this change from the
others so, at least for now, it's better to just revert
everything.
Reference:
https://www.illumos.org/issues/3026
Reported by: Navdeep Parhar and Mark Johnston
Merge changes from illumos:
3675 DTrace print() should try to resolve function pointers
3676 dt_print_enum hardcodes a value of zero
Illumos Revision: b1fa6326238973aeaf12c34fcda75985b6c06be1
Reference:
https://www.illumos.org/issues/3675https://www.illumos.org/issues/3676
Obtained from: Illumos
MFC after: 1 month
Merge changes from illumos:
3021 option for time-ordered output from dtrace(1M)
3022 DTrace: keys should not affect the sort order when sorting by value
3023 it should be possible to dereference dynamic variables
3024 D integer narrowing needs some work
3025 register leak in D code generation
3026 libdtrace should set LD_NOLAZYLOAD=1 to help the pid provider
This brings yet another feature implemented in upstream DTrace.
A complete description is available here:
http://dtrace.org/blogs/ahl/2012/07/28/my-new-dtrace-favorite/
This change bumps the DT_VERS_* number to 1.9.1 in
accordance to what is done in illumos.
This change was somewhat complicated because upstream is mixed many
changes in an individual commit and some of the tests don't really
apply to us.
There are also appear to be differences in timestamping with Solaris
so we had to workaround some assertions making sure no regression
happened.
Special thanks to Fabian Keil for changes and testing.
Illumos Revisions: 13758:23432da34147
Reference:
https://www.illumos.org/issues/3021https://www.illumos.org/issues/3022https://www.illumos.org/issues/3023https://www.illumos.org/issues/3024https://www.illumos.org/issues/3025https://www.illumos.org/issues/1694
Tested by: Fabian Keil
Obtained from: Illumos
MFC after: 1 months
release a non-existing snapshot of a existing dataset. In recursive case
error is reported if no snapshots with the requested name have been found.
Problem and proposed solution reported to illumos:
3699 zfs hold or release of a non-existent snapshot does not output error
MFC after: 8 days
doesn't copyout in this case.
To solve this issue a new struct zfs_iocparm_t is introduced consisting of:
- zfs_ioctl_version (future backwards compatibility purposes)
- user space pointer to zfs_cmd_t (copyin and copyout)
- size of zfs_cmd_t (verification purposes)
The copyin and copyout of zfs_cmd_t is now done the illumos (vendor) way
what makes porting of new changes easier and ensures correct behavior if
returning an error.
MFC after: 10 days
Merge change from vendor to reduce diff only.
ZFS dtrace probes are not supported on FreeBSD yet.
Illumos ZFS issues:
3598 want to dtrace when errors are generated in zfs
MFC after: 3 weeks
only other case where STT_FILE symbols are used, in symit_next() in
cddl/contrib/opensolaris/tools/ctf/cvt/input.c, save the basename of the
symbol, instead of the full pathname.
Reported by: avg
Tested by: avg, jimharris
MFC after: 1 week
Merge change from illumos:
1368 enablings on defunct providers prevent providers from unregistering
We try to address some underlying differences between the Solaris
and FreeBSD implementations: dtrace_attach() / dtrace_detach() are
currently unimplemented in FreeBSD but the new code from illumos
makes use of taskq so some adaptations were made to dtrace_open()
and dtrace_close() to handle them appropriately.
Illumos Revision: r13430:8e6add739e38
Reference:
https://www.illumos.org/issues/1368
Reviewed by: gnn
Tested by: Fabian Keil
Obtained from: Illumos
MFC after: 3 weeks
for and loading dependent modules. This addresses a bug seen with
io.d where it was being doubly included.
PR: 171678
Submitted by: Mark Johnston
MFC after: 2 weeks
Merge change from illumos:
1694 Add type-aware print() action
This is a very nice feature implemented in upstream Dtrace.
A complete description is available here:
http://dtrace.org/blogs/eschrock/2011/10/26/your-mdb-fell-into-my-dtrace/
This change bumps the DT_VERS_* number to 1.9.0 in
accordance to what is done in illumos.
While here also include some minor cleanups to ease further merging
and appease clang with a fix by Fabian Keil.
Illumos Revisions: 13501:c3a7090dbc16
13483:f413e6c5d297
Reference:
https://www.illumos.org/issues/1560https://www.illumos.org/issues/1694
Tested by: Fabian Keil
Obtained from: Illumos
MFC after: 1 month
Merge changes from illumos:
1451 DTrace needs toupper()/tolower() subroutines
1457 lltostr() D subroutine should take an optional base
This change bumps the DT_VERS_* number to 1.8.1 in
accordance to what is done in illumos.
The test suite we currently include is outdated and
doesnt support some updates in tst.subr.d which had to
be left out for now.
Illumos Revisions: r13458 5e394d8db762
r13459 c3454574dd1a
Reference:
https://www.illumos.org/issues/1451https://www.illumos.org/issues/1457
Tested by: Fabian Keil
Obtained from: Illumos
MFC after: 1 month
Merge change from illumos:
1455 DTrace tracemem() should take an optional size argument
Our local enhancements to dt_print_bytes were equivalent to
those in illumos but we made it match the illumos version
to ease further code merges.
For now leave out tst.smallsize.d and tst.smallsize.d.out
since those don't seem to work cleanly on FreeBSD.
This change bumps the DT_VERS_* number to 1.7.1 in accordance
to what is done in illumos.
Illumos Revision: 13457:571b0355c2e3
Reference:
https://www.illumos.org/issues/1455
Tested by: Fabian Keil
Obtained from: Illumos
MFC after: 1 month
It is not guaranteed that a program has a symbol table entry for main
and thus that it would be possible to set a breakpoint on it.
Reviewed by: rpaulo
Discussed with: rpaulo
MFC after: 13 days
includes MFV 238590, 238592, 247580
MFV 238590, 238592:
In the first zfs ioctl restructuring phase, the libzfs_core library was
introduced. It is a new thin library that wraps around kernel ioctl's.
The idea is to provide a forward-compatible way of dealing with new
features. Arguments are passed in nvlists and not random zfs_cmd fields,
new-style ioctls are logged to pool history using a new method of
history logging.
http://blog.delphix.com/matt/2012/01/17/the-future-of-libzfs/
MFV 247580 [1]:
To address issues of several deadlocks and race conditions the locking
code around dsl_dataset was rewritten and the interface to synctasks
was changed.
User-Visible Changes:
"zfs snapshot" can create more arbitrary snapshots at once (atomically)
"zfs destroy" destroys multiple snapshots at once
"zfs recv" has improved performance
Backward Compatibility:
I have extended the compatibility layer to support full backward
compatibility by remapping or rewriting the responsible ioctl arguments.
Old utilities are fully supported by the new kernel module.
Forward Compatibility:
New utilities work with old kernels with the following restrictions:
- creating, destroying, holding and releasing of multiple snapshots
at once is not supported, this includes recursive (-r) commands
Illumos ZFS issues:
2882 implement libzfs_core
2900 "zfs snapshot" should be able to create multiple,
arbitrary snapshots at once
3464 zfs synctask code needs restructuring
References:
https://www.illumos.org/issues/2882https://www.illumos.org/issues/2900https://www.illumos.org/issues/3464 [1]
MFC after: 1 month
Sponsored by: Hybrid Logic Inc. [1]
- provide complete backwards compatibility (old utility, new kernel)
- add zfs_cmd_t compatibility mapping in both directions
- determine ioctl address in zfs_ioctl_compat.c
Import minor ZFS changes from vendor
Illumos ZFS issues:
3604 zdb should print bpobjs more verbosely (fix zdb hang)
3606 zpool status -x shouldn't warn about old on-disk format
MFC after: 3 days
puts the full original source filename in the STT_FILE entry of the ELF
symbol table, while gcc saves only the basename.
Since the DWARF DW_AT_name attribute contains the full source filename,
both for clang and gcc, ctfconvert takes just the basename of it, for
matching with the STT_FILE entry. So when attempting to match with such
an entry, use its basename, if necessary.
Reported by: avg
MFC after: 1 week
Merge new read-only zfs properties from vendor (illumos)
Illumos ZFS issues:
3588 provide zfs properties for logical (uncompressed) space used and
referenced
References:
https://www.illumos.org/issues/3588
MFC after: 2 weeks
in r247265 (ZFS deadman thread). Both new utilities now support the old
kernel and new kernel properly detects old utilities.
For future backwards compatibility, the vfs.zfs.version.ioctl read-only
sysctl has been introduced. With this sysctl zfs utilities will be able
to detect the ioctl interface version of the currently loaded zfs module.
As a side effect, the zfs utilities between r247265 and this revision don't
support the old kernel module. If you are using HEAD newer or equal than
r247265, install the new kernel module (or whole kernel) first.
MFC after: 10 days
Merge the ZFS I/O deadman thread from vendor (illumos).
This feature panics the system on hanging ZFS I/O, helps debugging
and resumes failed service.
The panic behavior can be controlled with the loader-only tunables:
vfs.zfs.deadman_enabled (enable or disable panic on stalled ZFS I/O)
vfs.zfs.deadman_synctime (expiration time for stalled ZFS I/O)
By default, ZFS I/O deadman is enabled by default on amd64 and i386
excluding virtual guest machines.
Illumos ZFS issues:
3246 ZFS I/O deadman thread
References:
https://www.illumos.org/issues/3246
MFC after: 2 weeks
kernel. Properly restore, continue, and detach from processes
being DTraced when DTrace exits with an error so the program
being inspected is not terminated.
cddl/contrib/opensolaris/cmd/dtrace/dtrace.c:
In fatal(), the generic error handler, close the DTrace
handle as is done in the "probe/script" error handler
dfatal(). fatal() can be invoked after DTrace attaches
to processes (e.g. a script specified by command line
argument can't be found) and closing the handle will
release them.
Submitted by: Spectra Logic Corporation
Reviewed by: rpaulo, gnn
* Illumos zfs issue #3035 [1] LZ4 compression support in ZFS.
LZ4 is a new high-speed BSD-licensed compression algorithm created
by Yann Collet that delivers very high compression and decompression
performance compared to lzjb (>50% faster on compression, >80% faster
on decompression and around 3x faster on compression of incompressible
data), while giving better compression ratio [1].
This version of LZ4 corresponds to upstream's [2] revision 85.
Please note that for obvious reasons this is not backward read
compatible. This means once a pool have LZ4 compressed data, these
data can no longer be read by older ZFS implementations.
Local changes:
- On-stack hash table disabled and using kernel slab allocator
instead, at this time. This requires larger kernel thread stack
for zio workers. This may change in the future should we adjusted
the zio workers' thread stack size.
- likely and unlikely will be undefined if they are already defined,
this is required for i386 XEN build.
- Removed De Bruijn sequence based __builtin_ctz family of builtins
in favor of the latter. Both GCC and clang supports these builtins.
- Changed the way the LZ4 code detects endianness.
- Manual pages modifications to mention the feature based on Illumos
counterpart.
- Boot loader changes to make it support LZ4 decompression.
[1] https://www.illumos.org/issues/3035
[2] http://code.google.com/p/lz4/source/list
Obtained from: Illumos (13921:9d721847e469)
Tested on: FreeBSD/amd64
MFC after: 1 month
the underlying zap_count() to return no errors. However, it is possible
that the pool reaches to such a state where zap_count would return error,
leading to panics when a pool is imported.
This commit changes the ddt_zap_count to return error returned from
zap_count and handle the error appropriately. With this change, it's now
possible to let zpool rollback damaged transaction groups and import the
pool.
Obtained from: ZFS on Linux github (e8fd45a0f975c6b8ae8cd644714fc21f14fac2bf)
MFC after: 1 month
random order instead of creation order.
Eliminates needless filesystem renames caused by removed parent snapshots
which subsequently causes many more errors.
PR: kern/172259
Submitted by: Steven Hartland
Reviewed by: pjd (mentor)
Approved by: pjd (mentor)
MFC after: 2 weeks
Introduce a new dataset aclmode setting "restricted" to protect ACL's
being destroyed or corrupted by a drive-by chmod.
illumos-gate 13889:a67716f16746
3254 add support in zfs for aclmode=restricted
References:
https://www.illumos.org/issues/3254
MFC after: 2 weeks
Import the zio nop-write improvement from Illumos. To reduce I/O,
nop-write omits overwriting data if the checksum (cryptographically
secure) of new data matches the checksum of existing data.
It also saves space if snapshots are in use.
It currently works only on datasets with enabled compression, disabled
deduplication and sha256 checksums.
IllumOS 13887:196932ec9e6a and 13888:7204b3392a58
3236 zio nop-write
References:
https://www.illumos.org/issues/3236
MFC after: 2 weeks
Illumos 13886:e3261d03efbf
3349 zpool upgrade -V bumps the on disk version number, but leaves
the in core version
References:
https://www.illumos.org/issues/3349
MFC after: 1 week
