When ZPIOS was originally written it was designed to use the
device_create() and device_destroy() functions. Unfortunately,
these functions changed considerably over the years making them
difficult to rely on.
As it turns out a better choice would have been to use the
misc_register()/misc_deregister() functions. This interface
for registering character devices has remained stable, is simple,
and provides everything we need.
Therefore the code has been reworked to use this interface. The
higher level ZFS code has always depended on these same interfaces
so this is also as a step towards minimizing our kernel dependencies.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2757
Explicitly disable the unused by variable warnings by setting
__attribute__((unused)) for bdi_setup_and_register(). This is
required because the function is defined with the __must_check
attribute.
Signed-off-by: Bill McGonigle <bill-github.com-public1@bfccomputing.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#3141
The 'capabilities' argument which was passed to bdi_setup_and_register()
has been removed. File systems should no longer pass BDI_CAP_MAP_COPY.
For our purposes this means there are now three different interfaces
which must be handled. A zpl_bdi_setup_and_register() wrapper function
has been introduced to provide a single interface to the ZPL code.
* 2.6.32 - 2.6.33, bdi_setup_and_register() is not exported.
* 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
* 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
I've also taken this opportunity to remove HAVE_BDI because kernels
older then 2.6.32 are no longer supported. All kernels newer than
this will have one of the above interfaces.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Closes#3128
struct access f->f_dentry->d_inode was replaced by accessor function
file_inode(f)
Signed-off-by: Joerg Thalheim <joerg@higgsboson.tk>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#3084
The split count/scan shrinker callbacks introduced in 3.12 broke the
test for HAVE_SHRINK, effectively disabling the per-superblock shrinkers.
This patch re-enables the per-superblock shrinkers when the split shrinker
callbacks have been detected.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2975
META file updated and .nogitrelease file added to ensure
packages built from this tag use the release in META.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Missing space made the %post directive be part of the package
%description and not have a %post scriptlet defined.
Signed-off-by: Andy Bakun <github@thwartedefforts.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2961
In zfs_acl_chown_setattr(), the zfs_mode_comput() function is used to
create a traditional mode value based on an ACL. If no ACL exists, this
processing shouldn't be done. Problems caused by this were most evident
on version 4 filesystems which not only don't have system attributes,
and also frequently have empty ACLs. On such filesystems, performing a
chown() operation could have the effect of dirtying the mode bits in
memory but not on the file system as follows:
# create a file with typical mode of 664
echo test > test
chown anyuser test
ls -l test
and the mode will show up as all zeroes. Unmounting/mounting and/or
exporting/importing the filesystem will reveal the proper mode again.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#1264
If a spill block's dbuf hasn't yet been written when a spill block is
freed, the unwritten version will still be written. This patch handles
the case in which a spill block's dbuf is freed and undirties it to
prevent it from being written.
The most common case in which this could happen is when xattr=sa is being
used and a long xattr is immediately replaced by a short xattr as in:
setfattr -n user.test -v very_very_very..._long_value <file>
setfattr -n user.test -v short_value <file>
The first value must be sufficiently long that a spill block is generated
and the second value must be short enough to not require a spill block.
In practice, this would typically happen due to internal xattr operations
as a result of setting acltype=posixacl.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2663Closes#2700Closes#2701Closes#2717Closes#2863Closes#2884
These symbols are needed by consumers (i.e. Lustre) who wish to
integrate with the ZIL. In addition the zil_rollback_destroy()
prototype was removed because the implementation of this function
was removed long ago.
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2892
The Linux VFS handles mandatory locks generically so we shouldn't
need to check for conflicting locks in zfs_read(), zfs_write(), or
zfs_freesp(). Linux 3.18 removed the lock_may_read() and
lock_may_write() interfaces which we were relying on for this
purpose. Rather than emulating those interfaces we remove the
redundant checks.
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2804
The new shrinker API as of Linux 3.12 modifies "struct shrinker" by
replacing the @shrink callback with the pair of @count_objects and
@scan_objects. It also requires the return value of @count_objects to
return the number of objects actually freed whereas the previous @shrink
callback returned the number of remaining freeable objects.
This patch adds support for the new @scan_objects return value semantics.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes#2837
META file updated and .nogitrelease file added to ensure
packages built from this tag use the release in META.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Update the current code to ensure inodes are never dirtied if they are
part of a read-only file system or snapshot. If they do somehow get
dirtied an attempt will make made to write them to disk. In the case
of snapshots, which don't have a ZIL, this will result in a NULL
dereference in zil_commit().
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2405
Signed-off-by: Tom Prince <tom.prince@clusterhq.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2776
New versions of dkms clean up the build directory after installing.
It appears that this was always intended, but had rm -rf "/path/to/build/*"
(note the quotes), which prevented it from working.
Also, the build step is already installing stuff into the directory where
these files go, so installing our stuff there as part of build rather than
install makes sense.
Signed-off-by: Tom Prince <tom.prince@clusterhq.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2776
Commit 2ee4e7da accidentally introduced two issues which only occur
when rebuilding the ZFS source rpm outside the ZFS build system.
1) The _dracutdir, _udevdir, and _udevruledir macros must be checked
using the 'undefined' keyword. This was just overlooked in the
patch review and does not cause a failure when using 'make pkg'
because the values are provided by the make target.
2) The default _udevruledir path included a typo.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2310
There are two common locations where udev and dracut components are
commonly installed. When building packages using the 'make rpm|deb'
targets check those common locations and pass them to rpmbuild. For
non-standard configurations these values can be provided by the
the following configure options:
--with-udevdir=DIR install udev helpers [default=check]
--with-udevruledir=DIR install udev rules [[UDEVDIR/rules.d]]
--with-dracutdir=DIR install dracut helpers [default=check]
When rebuilding using the source packages the per-distribution
default values specified in the spec file will be used. This is
the preferred way to build packages for a distribution but the
ability to override the defaults is provided as a convenience.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2310Closes#1680
This reverts commit 91579709fc which
limited the asynchronous dispatch to kernel space. We want to do
this for two reasons:
1) While we have slightly more headroom in user space excessively
deep stacks have been observed while running ztest, see #2293.
2) Removing this conditional makes the pipeline behave consistently
regardless of if it's executing in kernel space or user space.
This way we're more likely to uncover subtle issues with ztest.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2384
Set LANG=C before calling 'rpmbuild' to avoid rpmbuild failing on
the translated date string in the changelog.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: zfsonlinux/spl#306
These options have existed for a long time but have historically
been undocumented because they are not guaranteed to be safe. They
should only be used as a last resort when attempting to recover a
damaged pool.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#1130
Document that the scan-related parameters are, in fact, applicable only
to scrub and/or resilver operations as appropriate.
Expand a few of the prefetch-related descriptions.
Add clarification to other module parameters.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2361
* Remove the references to share(1M), unshare(1M) and dfstab(4)
since they are not applicable to Linux.
* Add the exact exportfs command line used when setting sharenfs=on.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue: #1641
Users need to be aware that when adding devices to an existing pool
they may need to override automatically detected ashift value.
This will all depend on the exact hardware they are using.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #2024
According to the man page, "When the noauto option is set, a dataset
can only be mounted and unmounted explicitly. The dataset is not
mounted automatically when the dataset is created or imported ...."
When cloning a dataset the canmount property was not being honored.
This patch adds the required check to achieve the behavior described
in the man page.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2241
This adds ability to set the location of the kernel via defines
when building from the spec files. This is useful when building
against a kernel installed in a non-standard location.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#1874
From day one the various ZFS libraries should have been placed in their
own sub-packages. Primarily this allows for multiple major versions of
the libraries to be concurrently installed. It also facilitates a
smaller build environment by minimizing the required dependencies.
The specific changes required to split the libraries from the utilities
are as follows:
* libzpool2, libnvpair1, libuutil1, and libzfs2 packages were added
and contain the versioned shared libraries. The Fedora packaging
guidelines discourage providing static libraries so they are not
included in the packages.
http://fedoraproject.org/wiki/Packaging:Guidelines#Packaging_Static_Libraries
* The zfs-devel package was renamed libzfs2-devel and the new package
obsoletes the old zfs-devel package. This package includes all
the required headers for the libzpool2, libnvpair1, libuutil1, and
libzfs2 libraries and their respective unversioned shared libraries.
This package should eventually be split in to individual lib*-devel
packages but it will still take some work to cleanly separate them.
Therefore the libzfs2-devel package provides the expected lib*-devel
packages so the all proper dependencies can still be created.
http://fedoraproject.org/wiki/Packaging:Guidelines#Devel_Packages
* Moved '/sbin/ldconfig' execution from the zfs packge to each of the
new library packages as described by the packaging guidelines.
http://fedoraproject.org/wiki/Packaging:Guidelines#Shared_Libraries
* The /usr/share/doc/ files were moved in to the libzfs2-devel package.
* Updated config/deb.am to be aware of the packaging changes. This
ensures that 'deb-utils' make target converts all the resulting
packages generated by the 'rpm-utils' target.
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #2329Closes: #2341
Issue: #2145
Clang's static analyzer reported that the value assigned to pcksum is
never used. That is because we initialize both zc and pcksum to {{ 0 }}
and then do `pcksum = zc;`. That is fairly pointless. However, it has
the effect of generating a false positive in Clang's static analyzer.
Since noise from false positives can obscure real issues, we fix it
anyway.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2330
Clang's static analyzer reported a memory leak in zpool_clear_label().
Upon review, it turns out to be right. This should be a very short lived
leak because no daemons use this functionality, but that does not
preclude the possibility of third party daemons that do use it. Lets fix
it to be a good Samaritan.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2330
Some kernel definitions were buried inside the #if... #endif logic for
ACLs. When ACLs are not available these definitions get lost causing
the build to fail.
Signed-off-by: Chris Wedgwood <cw@f00f.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2349
Running 'yum upgrade zfs-dkms' package could appear to work properly
and still leave you with no zfs modules installed. This will occur
when only the zfs release, and not the version, are incremented.
This may be the case for a fast moving zfs-testing repository.
During the upgrade process DKMS will realize that zfs-x.y.z is already
installed and remove it. DKMS then correctly builds the new modules
for zfs-x.y.z. However, as a final step when the old zfs-x.y.z-r is
removed the %preun script runs and removes the newly build modules.
To handle this case the %preun script has been updated to only run
when the installed version exactly matches the full spec file version.
This change also updated ChangeLog section based on the DKMS
reference spec file.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
When creating packages in a git repository the release number
can be automatically set by 'git describe'. This normally works
well but if your repository has newer tags which match the form
NAME-VERSION* the release may be incorrectly calculated. To
prevent this the match patten has been restricted to the contents
of the META file, NAME-VERSION.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
We should not override the default memory type of the kmem cache. This
was done previously to force certain objects which were slightly over
object size limit cut off in to KMC_KMEM caches for better performance.
The zfsonlinux/spl#356 patch slightly increases the default cut off
from 511 bytes 1024 bytes for x86_64. This means there is long longer
a need to override the default for the caches. And since the default
values are now being used the new spl_kmem_cache_slab_limit and
spl_kmem_cache_kmem_limit tunables will apply to all kmem caches.
The following is a list of caches that will be impacted:
| object size | forced type | default type
----------------- | ------------- | ------------- | --------------
dnode_t | 936 bytes | KMC_KMEM | KMC_KMEM
zio_cache | 1104 bytes | *KMC_KMEM | *KMC_VMEM
zio_link_cache | 48 bytes | KMC_KMEM | KMC_KMEM
zio_vdev_cache | 131088 bytes | KMC_VMEM | KMC_VMEM
zio_buf_512 | 512 bytes | KMC_KMEM | KMC_KMEM
zio_data_buf_512 | 512 bytes | KMC_KMEM | KMC_KMEM
zio_buf_1024 | 1024 bytes | KMC_KMEM | KMC_KMEM
zio_data_buf_1024 | 1024 bytes | +KMC_VMEM | +KMC_KMEM
* Cache memory type will change from KMC_KMEM to KMC_VMEM.
+ Cache memory type will change from KMC_VMEM to KMC_KMEM.
This patch removes another slight point of divergence between ZoL
and Illumos.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Closes#2337
Resolve gcc 4.9.0 20140507 warnings about uninitialized 'ptr' when
using -Wmaybe-uninitialized. The first two cases appears appear
to be legitimate but not the second two. In general this is a
good practice so they are all initialized.
Signed-off-by: Marcel Huber <marcelhuberfoo@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2345
For consistency with disk vdevs honor the zfs_nocacheflush tunable.
This setting is available primarily for debugging and performance
analysis.
Signed-off-by: HC <mmttdebbcc@yahoo.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2336
In the case where a variable-sized SA overlaps the spill block pointer and
a new variable-sized SA is being added, the header size was improperly
calculated to include the to-be-moved SA. This problem could be
reproduced when xattr=sa enabled as follows:
ln -s $(perl -e 'print "x" x 120') blah
setfattr -n security.selinux -v blahblah -h blah
The symlink is large enough to interfere with the spill block pointer and
has a typical SA registration as follows (shown in modified "zdb -dddd"
<SA attr layout obj> format):
[ ... ZPL_DACL_COUNT ZPL_DACL_ACES ZPL_SYMLINK ]
Adding the SA xattr will attempt to extend the registration to:
[ ... ZPL_DACL_COUNT ZPL_DACL_ACES ZPL_SYMLINK ZPL_DXATTR ]
but since the ZPL_SYMLINK SA interferes with the spill block pointer, it
must also be moved to the spill block which will have a registration of:
[ ZPL_SYMLINK ZPL_DXATTR ]
This commit updates extra_hdrsize when this condition occurs, allowing
hdrsize to be subsequently decreased appropriately.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Issue #2214
Issue #2228
Issue #2316
Issue #2343
Restructure the zfsdev_state_list to allow for lock-free reading by
converting to a simple singly-linked list from which items are never
deleted and over which only forward iterations are performed. It depends
on, among other things, the atomicity of accessing the zs_minor integer
and zs_next pointer.
This fixes a lock inversion in which the zfsdev_state_lock is used by
both the sync task (txg_sync) and indirectly by any user program which
uses /dev/zfs; the zfsdev_release method uses the same lock and then
blocks on the sync task.
The most typical failure scenerio occurs when the sync task is cleaning
up a user hold while various concurrent "zfs" commands are in progress.
Neither Illumos nor Solaris are affected by this issue because they use
DDI interface which provides lock-free reading of device state via the
ddi_get_soft_state() function.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2301
Verbatim imports can cause hostid mismatches, but things otherwise work. `zpool
status` does not handle this and will fail when assertions are enabled:
```
zpool: ../../cmd/zpool/zpool_main.c:4418: status_callback: Assertion `reason == ZPOOL_STATUS_OK' failed.
Program received signal SIGABRT, Aborted.
```
Lets instead add a case to display an informative message such as this:
```
pool: rpool
state: ONLINE
status: Mismatch between pool hostid and system hostid on imported pool.
This pool was previously imported into a system with a different hostid,
and then was verbatim imported into this system.
action: Export this pool on all systems on which it is imported.
Then import it to correct the mismatch.
see: http://zfsonlinux.org/msg/ZFS-8000-EY
scan: scrub repaired 0 in 0h8m with 0 errors on Thu Apr 17 19:43:57 2014
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
sda ONLINE 0 0 0
errors: No known data errors
```
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2342
Originally, vdev_file used system_taskq. This would cause a deadlock,
especially on system with few CPUs. The reason is that the prefetcher
threads, which are on system_taskq, will sometimes be blocked waiting
for I/O to finish. If the prefetcher threads consume all the tasks in
system_taskq, the I/O cannot be served and thus results in a deadlock.
We fix this by creating a dedicated vdev_file_taskq for vdev_file I/O.
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2270
The dva_get_dsize_sync() function incorrectly assumes that the call
to vdev_lookup_top() cannot fail. However, the NULL dereference at
clearly shows that under certain circumstances it is possible. Note
that offset 0x570 (1376) maps as expected to vd->vdev_deflate_ratio.
BUG: unable to handle kernel NULL pointer dereference at 00000570
crash> struct -o vdev
struct vdev {
[0] uint64_t vdev_id;
... ...
[1376] uint64_t vdev_deflate_ratio;
Given that this can happen this patch add the required error handling.
In the case where vdev_lookup_top() fails assume that no deflation
will occur for the DVA and use the asize.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
Closes#1707Closes#1987Closes#1891
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
When fetching property values of snapshots, a check against the head
dataset type must be performed. Previously, this additional check was
performed only when fetching "version", "normalize", "utf8only" or "case".
This caused the ZPL properties "acltype", "exec", "devices", "nbmand",
"setuid" and "xattr" to be erroneously displayed with meaningless values
for snapshots of volumes. It also did not allow for the display of
"volsize" of a snapshot of a volume.
This patch adds the headcheck flag paramater to zfs_prop_valid_for_type()
and zprop_valid_for_type() to indicate the check is being done
against a head dataset's type in order that properties valid only for
snapshots are handled correctly. This allows the the head check in
get_numeric_property() to be performed when fetching a property for
a snapshot.
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2265
A minor style issue was accidentally introduced by aa7d06a.
This change resolves that style problem.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Today the metaslab_debug logic performs two tasks:
- load all metaslabs on import/open
- don't unload metaslabs at the end of spa_sync
This change provides knobs for each of these independently.
References:
https://illumos.org/issues/4101https://github.com/illumos/illumos-gate/commit/0713e23
Notes:
1) This is a small piece of the metaslab improvement patch from
Illumos. It was worth bringing over before the rest, since it's
low risk and it can be useful on fragmented pools (e.g. Lustre
MDTs). metaslab_debug_unload would give the performance benefit
of the old metaslab_debug option without causing unwanted delay
during pool import.
Ported-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#2227
When the system attributes (SAs) for an object exceed what can
can be stored in the bonus area of a dnode a spill block is
allocated. These spill blocks are currently considered data
blocks. However, they should be accounted for as meta data
because they are effectively an extension of the dnode.
While this may seem like a minor accounting issue it has broader
implications. The key thing to be aware of is that each spill
block will hold a reference on its parent dnode. The dnode in
turn holds a reference on its dbuf in the dnode object. This
means that a single 512 byte data buffer for a spill block can
pin over 16k of meta data. This is analogous to the small file
situation described in 2b13331 where a relatively small number
of data buffer can cause the ARC to exceed the meta limit.
However, unlike the small file case a spill block can legitimately
be considered meta data. By changing the spill block to meta data
they will now be dropped from the cache when the meta limit is
reached. This then allows the dnodes and dbufs which the spill
block was pinning to be released.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Closes#2294
ztest is intended to subject the ZFS code in userland to stress that it
should be able to withstand. Any failures that occur when running it are
failures that likely would occur inside the kernel. However, being in
userland, it is much easier to debug them. In practice, this prevents
a large number of problems from reaching production code.
A design decision was made by the original authors of ztest to make a
distinction between userland locking primitives and kernel locking
primitives. The ztest code itself calls userland locking primitives
while the kernel code being run in userland will call emulated kernel
locking primitives that wrap the userland locking primitives.
When ztest was first ported to Linux, a decision was made to use the
emulated kernel interfaces everywhere. In effect, the userland
rw_rdlock()/rw_wrlock() became the kernel rw_enter() and and the userland
rw_unlock() became the kernel rw_exit(). This caused a regression
because of an assertion in rw_enter() to catch recursive locking. That
is permitted in userland, but not in the kernel. Consequently, the ztest
code itself does recursive read locking. The use of the emulated kernel
interfaces consequently caused the following failure:
ztest: ../../lib/libzpool/kernel.c:384: Assertion `rwlp->rw_owner !=
zk_thread_current() (0x1c87150 != 0x1c87150)' failed.
That occurs because ztest_dmu_objset_create_destroy() will take a read
lock and call ztest_dmu_object_alloc_free(). That will call ztest_io(),
which will take a readlock only when asked to do ZTEST_IO_REWRITE. This
triggered the assertion.
The pthreads rwlock interface was based on the LWP rwlock interface
implemented in Illumos libc. Luckily enough, the subset used by ztest is
almost identical, so we can solve this problem by switching to the LWP
thread rwlock interface in ztest. This eliminates a point of divergence
with Illumos and should make code sharing slightly easier.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#1970
Brian Behlendorf
Bill McGonigle
Jörg Thalheim
Tim Chase
Andy Bakun
Alex Zhuravlev
Ned Bass
Tom Prince
Turbo Fredriksson
Derek Dai
Ben Allen
Richard Yao
Chris Wedgwood
Marcel Huber
John Albietz
HC
Chunwei Chen
George Wilson