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* Add .zfs control directoryBrian Behlendorf2012-03-2212-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the .zfs control directory. This was accomplished by leveraging as much of the existing ZFS infrastructure as posible and updating it for Linux as required. The bulk of the core functionality is now all there with the following limitations. *) The .zfs/snapshot directory automount support requires a 2.6.37 or newer kernel. The exception is RHEL6.2 which has backported the d_automount patches. *) Creating/destroying/renaming snapshots with mkdir/rmdir/mv in the .zfs/snapshot directory works as expected. However, this functionality is only available to root until zfs delegations are finished. * mkdir - create a snapshot * rmdir - destroy a snapshot * mv - rename a snapshot The following issues are known defeciences, but we expect them to be addressed by future commits. *) Add automount support for kernels older the 2.6.37. This should be possible using follow_link() which is what Linux did before. *) Accessing the .zfs/snapshot directory via NFS is not yet possible. The majority of the ground work for this is complete. However, finishing this work will require resolving some lingering integration issues with the Linux NFS kernel server. *) The .zfs/shares directory exists but no futher smb functionality has yet been implemented. Contributions-by: Rohan Puri <[email protected]> Contributiobs-by: Andrew Barnes <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #173
* Use stderr for 'no pools/datasets available' errorGregor Kopka2012-03-152-6/+6
| | | | | | | | | | | The 'zfs list' and 'zpool list' commands output the message 'no datasets/pools available' to stdout. This should go to stderr and only the available datasets/pools should go to stdout. Returning nothing to stdout is expected behavior when there is nothing to list. Signed-off-by: Brian Behlendorf <[email protected]> Closes #581
* Cleanly support debug packagesBrian Behlendorf2012-02-2712-0/+12
| | | | | | | | | | | | | | | | | | | Allow a source rpm to be rebuilt with debugging enabled. This avoids the need to have to manually modify the spec file. By default debugging is still largely disabled. To enable specific debugging features use the following options with rpmbuild. '--with debug' - Enables ASSERTs # For example: $ rpmbuild --rebuild --with debug zfs-modules-0.6.0-rc6.src.rpm Additionally, ZFS_CONFIG has been added to zfs_config.h for packages which build against these headers. This is critical to ensure both zfs and the dependant package are using the same prototype and structure definitions. Signed-off-by: Brian Behlendorf <[email protected]>
* Return success from check_slice() if device doesn't existNed Bass2012-02-271-9/+0
| | | | | | | | | | | | | | | When creating a new pool, make_root_vdev() calls check_in_use() to ensure that none of the consituent disks are in use. If the disk contains a valid vdev label it is read to retrieve the list of its child vdevs and these are checked recursively. However, the partitions stored in the vdev label my no longer exist, for example if the partition table has since been altered. In any such case we would want the pool creation to proceed, so this change removes the check from check_slice() that returns an error if the device doesn't exist. As an added assurance, the Solaris implementation also returns sucess on ENOENT. Signed-off-by: Brian Behlendorf <[email protected]>
* Add support for DISCARD to ZVOLs.Etienne Dechamps2012-02-0912-0/+12
| | | | | | | | | | | | | | | | | | | | DISCARD (REQ_DISCARD, BLKDISCARD) is useful for thin provisioning. It allows ZVOL clients to discard (unmap, trim) block ranges from a ZVOL, thus optimizing disk space usage by allowing a ZVOL to shrink instead of just grow. We can't use zfs_space() or zfs_freesp() here, since these functions only work on regular files, not volumes. Fortunately we can use the low-level function dmu_free_long_range() which does exactly what we want. Currently the discard operation is not added to the log. That's not a big deal since losing discard requests cannot result in data corruption. It would however result in disk space usage higher than it should be. Thus adding log support to zvol_discard() is probably a good idea for a future improvement. Signed-off-by: Brian Behlendorf <[email protected]>
* Support the fallocate() file operation.Etienne Dechamps2012-02-0912-0/+12
| | | | | | | | | | | | | | Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is supported, since it's the only one that matches the behavior of zfs_space(). This makes it pretty much useless in its current form, but it's a start. To support other flag combinations we would need to modify zfs_space() to make it more flexible, or emulate the desired functionality in zpl_fallocate(). Signed-off-by: Brian Behlendorf <[email protected]> Issue #334
* Improve ZVOL queue behavior.Etienne Dechamps2012-02-0712-0/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Linux block device queue subsystem exposes a number of configurable settings described in Linux block/blk-settings.c. The defaults for these settings are tuned for hard drives, and are not optimized for ZVOLs. Proper configuration of these options would allow upper layers (I/O scheduler) to take better decisions about write merging and ordering. Detailed rationale: - max_hw_sectors is set to unlimited (UINT_MAX). zvol_write() is able to handle writes of any size, so there's no reason to impose a limit. Let the upper layer decide. - max_segments and max_segment_size are set to unlimited. zvol_write() will copy the requests' contents into a dbuf anyway, so the number and size of the segments are irrelevant. Let the upper layer decide. - physical_block_size and io_opt are set to the ZVOL's block size. This has the potential to somewhat alleviate issue #361 for ZVOLs, by warning the upper layers that writes smaller than the volume's block size will be slow. - The NONROT flag is set to indicate this isn't a rotational device. Although the backing zpool might be composed of rotational devices, the resulting ZVOL often doesn't exhibit the same behavior due to the COW mechanisms used by ZFS. Setting this flag will prevent upper layers from making useless decisions (such as reordering writes) based on incorrect assumptions about the behavior of the ZVOL. Signed-off-by: Brian Behlendorf <[email protected]>
* Fix synchronicity for ZVOLs.Etienne Dechamps2012-02-0712-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | zvol_write() assumes that the write request must be written to stable storage if rq_is_sync() is true. Unfortunately, this assumption is incorrect. Indeed, "sync" does *not* mean what we think it means in the context of the Linux block layer. This is well explained in linux/fs.h: WRITE: A normal async write. Device will be plugged. WRITE_SYNC: Synchronous write. Identical to WRITE, but passes down the hint that someone will be waiting on this IO shortly. WRITE_FLUSH: Like WRITE_SYNC but with preceding cache flush. WRITE_FUA: Like WRITE_SYNC but data is guaranteed to be on non-volatile media on completion. In other words, SYNC does not *mean* that the write must be on stable storage on completion. It just means that someone is waiting on us to complete the write request. Thus triggering a ZIL commit for each SYNC write request on a ZVOL is unnecessary and harmful for performance. To make matters worse, ZVOL users have no way to express that they actually want data to be written to stable storage, which means the ZIL is broken for ZVOLs. The request for stable storage is expressed by the FUA flag, so we must commit the ZIL after the write if the FUA flag is set. In addition, we must commit the ZIL before the write if the FLUSH flag is set. Also, we must inform the block layer that we actually support FLUSH and FUA. Signed-off-by: Brian Behlendorf <[email protected]>
* Linux 3.3 compat, sops->show_options()Brian Behlendorf2012-02-0312-0/+12
| | | | | | | | | | The second argument of sops->show_options() was changed from a 'struct vfsmount *' to a 'struct dentry *'. Add an autoconf check to detect the API change and then conditionally define the expected interface. In either case we are only interested in the zfs_sb_t. Signed-off-by: Brian Behlendorf <[email protected]> Closes #549
* Combine libraries: spl, avl, efi, share, unicode.Darik Horn2012-01-1712-81/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | These libraries, which are an artifact of the ZoL development process, conflict with packages that are already in distribution: * libspl: SPL Programming Language * libavl: AVL for Linux * libefi: GRUB And these libraries are potential conflicts: * libshare: the Linux Mount Manager * libunicode: Perl and Python Recompose these five ZoL components into the four libraries that are conventionally provided by Solaris and FreeBSD systems: + libnvpair + libuutil + libzpool + libzfs This change resolves the name conflict, makes ZoL more compatible with existing software that uses autotools to detect ZFS, and allows pkg-zfs to better reflect the official Debian kFreeBSD packaging. Signed-off-by: Brian Behlendorf <[email protected]> Closes: #430
* Add overlay(-O) mount option supportSuman Chakravartula2012-01-121-2/+4
| | | | | | | | | | | | | | | | | | | Linux supports mounting over non-empty directories by default. In Solaris this is not the case and -O option is required for zfs mount to mount a zfs filesystem over a non-empty directory. For compatibility, I've added support for -O option to mount zfs filesystems over non-empty directories if the user wants to, just like in Solaris. I've defined MS_OVERLAY to record it in the flags variable if the -O option is supplied. The flags variable passes through a few functions and its checked before performing the empty directory check in zfs_mount function. If -O is given, the check is not performed. Signed-off-by: Brian Behlendorf <[email protected]> Closes #473
* Avoid using awk in the zpool_id script.Darik Horn2012-01-111-4/+13
| | | | | | | | Some implementations of `awk` incorrectly parse the \< and \> regex symbols, so use a `while read` loop and regular globbing instead. Signed-off-by: Brian Behlendorf <[email protected]> Closes: #259
* Linux 3.1 compat, super_block->s_shrinkBrian Behlendorf2012-01-1112-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Linux 3.1 kernel has introduced the concept of per-filesystem shrinkers which are directly assoicated with a super block. Prior to this change there was one shared global shrinker. The zfs code relied on being able to call the global shrinker when the arc_meta_limit was exceeded. This would cause the VFS to drop references on a fraction of the dentries in the dcache. The ARC could then safely reclaim the memory used by these entries and honor the arc_meta_limit. Unfortunately, when per-filesystem shrinkers were added the old interfaces were made unavailable. This change adds support to use the new per-filesystem shrinker interface so we can continue to honor the arc_meta_limit. The major benefit of the new interface is that we can now target only the zfs filesystem for dentry and inode pruning. Thus we can minimize any impact on the caching of other filesystems. In the context of making this change several other important issues related to managing the ARC were addressed, they include: * The dnlc_reduce_cache() function which was called by the ARC to drop dentries for the Posix layer was replaced with a generic zfs_prune_t callback. The ZPL layer now registers a callback to drop these dentries removing a layering violation which dates back to the Solaris code. This callback can also be used by other ARC consumers such as Lustre. arc_add_prune_callback() arc_remove_prune_callback() * The arc_reduce_dnlc_percent module option has been changed to arc_meta_prune for clarity. The dnlc functions are specific to Solaris's VFS and have already been largely eliminated already. The replacement tunable now represents the number of bytes the prune callback will request when invoked. * Less aggressively invoke the prune callback. We used to call this whenever we exceeded the arc_meta_limit however that's not strictly correct since it results in over zeleous reclaim of dentries and inodes. It is now only called once the arc_meta_limit is exceeded and every effort has been made to evict other data from the ARC cache. * More promptly manage exceeding the arc_meta_limit. When reading meta data in to the cache if a buffer was unable to be recycled notify the arc_reclaim thread to invoke the required prune. * Added arcstat_prune kstat which is incremented when the ARC is forced to request that a consumer prune its cache. Remember this will only occur when the ARC has no other choice. If it can evict buffers safely without invoking the prune callback it will. * This change is also expected to resolve the unexpect collapses of the ARC cache. This would occur because when exceeded just the arc_meta_limit reclaim presure would be excerted on the arc_c value via arc_shrink(). This effectively shrunk the entire cache when really we just needed to reclaim meta data. Signed-off-by: Brian Behlendorf <[email protected]> Closes #466 Closes #292
* Add LIBSELINUX to mount_zfs_LDFLAGS.Darik Horn2011-12-162-2/+2
| | | | | | | | | | | | | Regenerating the autotools configuration on Debian and Ubuntu systems causes compilation to fail with this error message: cmd/mount_zfs/../../cmd/mount_zfs/mount_zfs.c:403: undefined reference to `is_selinux_enabled' In the automake template, set "mount_zfs_LDFLAGS = ... $(LIBSELINUX)" so that the /sbin/mount.zfs utility is linked to libselinux. Signed-off-by: Brian Behlendorf <[email protected]>
* Linux 3.2 compat: set_nlink()Darik Horn2011-12-1612-0/+12
| | | | | | | | | | | Directly changing inode->i_nlink is deprecated in Linux 3.2 by commit SHA: bfe8684869601dacfcb2cd69ef8cfd9045f62170 Use the new set_nlink() kernel function instead. Signed-off-by: Brian Behlendorf <[email protected]> Closes: #462
* Add make rule for building Arch Linux packagesPrakash Surya2011-12-1412-0/+72
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Added the necessary build infrastructure for building packages compatible with the Arch Linux distribution. As such, one can now run: $ ./configure $ make pkg # Alternatively, one can run 'make arch' as well on the Arch Linux machine to create two binary packages compatible with the pacman package manager, one for the zfs userland utilities and another for the zfs kernel modules. The new packages can then be installed by running: # pacman -U $package.pkg.tar.xz In addition, source-only packages suitable for an Arch Linux chroot environment or remote builder can also be build using the 'sarch' make rule. NOTE: Since the source dist tarball is created on the fly from the head of the build tree, it's MD5 hash signature will be continually influx. As a result, the md5sum variable was intentionally omitted from the PKGBUILD files, and the '--skipinteg' makepkg option is used. This may or may not have any serious security implications, as the source tarball is not being downloaded from an outside source. Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #491
* Demote the whackbang in the zpool_id script.Darik Horn2011-12-051-1/+1
| | | | | | | | | The zpool_id script is posixly correct and does not use bash features, so change its whackbang from /bin/bash to /bin/sh. Debian policy also stipulates that system scripts be dash compatible. Signed-off-by: Brian Behlendorf <[email protected]>
* Demote egrep to grep in the zpool_id script.Darik Horn2011-12-051-1/+1
| | | | | | | Direct invocation of GNU egrep is deprecated by its man page, and the its argument in the zpool_id script is not an extended expression. Signed-off-by: Brian Behlendorf <[email protected]>
* Quote variables in the zpool_id script.Darik Horn2011-12-051-12/+12
| | | | | | | | | | | For consistency and safety, quote all variables in the zpool_id script. This accomodates a `-c CONFIG` parameter value with whitespace in the path name. Also fix a typo in the usage synopsis for `-h`. Signed-off-by: Brian Behlendorf <[email protected]> Issue #439
* Support path_id changes in udev 174.Darik Horn2011-12-051-1/+9
| | | | | | | | The /lib/udev/path_id helper became a builtin command in the udev 174 release, so test whether path_id is external in the zpool_id script. Signed-off-by: Brian Behlendorf <[email protected]> Closes: #429
* Simplify BDI integrationBrian Behlendorf2011-11-0812-0/+12
| | | | | | | | | | | | | | Update the code to use the bdi_setup_and_register() helper to simplify the bdi integration code. The updated code now just registers the bdi during mount and destroys it during unmount. The only complication is that for 2.6.32 - 2.6.33 kernels the helper wasn't available so in these cases the zfs code must provide it. Luckily the bdi_setup_and_register() function is trivial. Signed-off-by: Brian Behlendorf <[email protected]> Closes #367
* Change sun.com URLs to zfsonlinux.orgDarik Horn2011-10-241-3/+3
| | | | | | | | | | | | ZFS contains error messages that point to the defunct www.sun.com domain, which is currently offline. Change these error messages to use the zfsonlinux.org mirror instead. This commit depends on: zfsonlinux/zfsonlinux.github.com@8e10ead3dc66e2204ae893d81528371405f107e7 Signed-off-by: Brian Behlendorf <[email protected]>
* Export symbols for the VFS APIBrian Behlendorf2011-10-111-1/+1
| | | | | | | | | | | | | | Export all symbols already marked extern in the zfs_vfsops.h header. Several non-static symbols have also been added to the header and exportewd. This allows external modules to more easily create and manipulate properly created ZFS filesystem type datasets. Rename zfsvfs_teardown() to zfs_sb_teardown and export it. This is done simply for consistency with the rest of the code base. All other zfsvfs_* functions have already been renamed. Signed-off-by: Brian Behlendorf <[email protected]>
* Fix uninitialized varible in zfs_do_userspace()Brian Behlendorf2011-09-271-1/+1
| | | | | | | | | | | | | | When compiling under Debian Lenny with gcc version 4.3.2 (Debian 4.3.2-1.1) the following warning occurs. To quiet the warning initialize 'error' to zero. Newer versions of gcc correctly determine that this uninitialized varible is impossible because ZFS_NUM_USERQUOTA_PROPS is known to be greater than zero. cmd/zfs/zfs_main.c:2377: warning: "error" may be used uninitialized in this function Signed-off-by: Brian Behlendorf <[email protected]>
* Fixed uninitialized variableBrian Behlendorf2011-08-191-1/+1
| | | | | | | | | | | This warning was accidentally introduced by commit b7936d5c2337bc976ac831c1c38de563844c36b. The fix is to simply initialize the variable to ZFS_DELEG_WHO_UNKNOWN. cmd/zfs/zfs_main.c:4460:25: warning: 'who_type' may be used uninitialized in this function Signed-off-by: Brian Behlendorf <[email protected]>
* Fix missing format argumentsBrian Behlendorf2011-08-191-3/+3
| | | | | | | | | | | These warnings were accidentally introduced by commit b7936d5c2337bc976ac831c1c38de563844c36b. The fix is to simply add the missing format specifier. cmd/zfs/zfs_main.c:4565: warning: format not a string literal and no format arguments Signed-off-by: Brian Behlendorf <[email protected]>
* Disable zfs /etc/mtab updatesBrian Behlendorf2011-08-191-2/+1
| | | | | | | | | | | | Completely disable the zfs binary from attempting to directly update /etc/mtab. The Linux port relies entirely on the mount.zfs helper to safely update /etc/mtab. If we left the /etc/mtab updates to the zfs binary then they could race with concurrent non-zfs mounts. Routing everything through the system mount command ensures the /etc/mtab updates are locked properly. Signed-off-by: Brian Behlendorf <[email protected]> Issue #329
* Autogen refresh for udev changesBrian Behlendorf2011-08-0812-67/+104
| | | | | | | | Run autogen.sh using the same autotools versions as upstream: * autoconf-2.63 * automake-1.11.1 * libtool-2.2.6b
* Move udev rules from /etc/udev to /lib/udevKyle Fuller2011-08-083-3/+3
| | | | | | | | | | | | | | | | | | | This change moves the default install location for the zfs udev rules from /etc/udev/ to /lib/udev/. The correct convention is for rules provided by a package to be installed in /lib/udev/. The /etc/udev/ directory is reserved for custom rules or local overrides. Additionally, this patch cleans up some abuse of the bindir install location by adding a udevdir and udevruledir install directories. This allows us to revert to the default bin install location. The udev install directories can be set with the following new options. --with-udevdir=DIR install udev helpers [EPREFIX/lib/udev] --with-udevruledir=DIR install udev rules [UDEVDIR/rules.d] Signed-off-by: Brian Behlendorf <[email protected]> Closes #356
* Add backing_device_info per-filesystemBrian Behlendorf2011-08-0412-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For a long time now the kernel has been moving away from using the pdflush daemon to write 'old' dirty pages to disk. The primary reason for this is because the pdflush daemon is single threaded and can be a limiting factor for performance. Since pdflush sequentially walks the dirty inode list for each super block any delay in processing can slow down dirty page writeback for all filesystems. The replacement for pdflush is called bdi (backing device info). The bdi system involves creating a per-filesystem control structure each with its own private sets of queues to manage writeback. The advantage is greater parallelism which improves performance and prevents a single filesystem from slowing writeback to the others. For a long time both systems co-existed in the kernel so it wasn't strictly required to implement the bdi scheme. However, as of Linux 2.6.36 kernels the pdflush functionality has been retired. Since ZFS already bypasses the page cache for most I/O this is only an issue for mmap(2) writes which must go through the page cache. Even then adding this missing support for newer kernels was overlooked because there are other mechanisms which can trigger writeback. However, there is one critical case where not implementing the bdi functionality can cause problems. If an application handles a page fault it can enter the balance_dirty_pages() callpath. This will result in the application hanging until the number of dirty pages in the system drops below the dirty ratio. Without a registered backing_device_info for the filesystem the dirty pages will not get written out. Thus the application will hang. As mentioned above this was less of an issue with older kernels because pdflush would eventually write out the dirty pages. This change adds a backing_device_info structure to the zfs_sb_t which is already allocated per-super block. It is then registered when the filesystem mounted and unregistered on unmount. It will not be registered for mounted snapshots which are read-only. This change will result in flush-<pool> thread being dynamically created and destroyed per-mounted filesystem for writeback. Signed-off-by: Brian Behlendorf <[email protected]> Closes #174
* Illumos #278: get rid zfs of python and pyzfs dependenciesAlexander Stetsenko2011-08-011-31/+2240
| | | | | | | | | | | | | | | | | | | | | Remove all python and pyzfs dependencies for consistency and to ensure full functionality even in a mimimalist environment. Reviewed by: [email protected] Reviewed by: [email protected] Reviewed by: [email protected] Reviewed by: [email protected] Approved by: [email protected] References to Illumos issue and patch: - https://www.illumos.org/issues/278 - https://github.com/illumos/illumos-gate/commit/1af68beac3 Signed-off-by: Brian Behlendorf <[email protected]> Issue #340 Issue #160 Signed-off-by: Brian Behlendorf <[email protected]>
* Illumos #883: ZIL reuse during remount corruptionEric Schrock2011-08-011-0/+36
| | | | | | | | | | | | | | | | | | | | | Moving the zil_free() cleanup to zil_close() prevents this problem from occurring in the first place. There is a very good description of the issue and fix in Illumus #883. Reviewed by: Matt Ahrens <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Albert Lee <[email protected]> Reviewed by: Gordon Ross <[email protected]> Reviewed by: Garrett D'Amore <[email protected]> Reivewed by: Dan McDonald <[email protected]> Approved by: Gordon Ross <[email protected]> References to Illumos issue and patch: - https://www.illumos.org/issues/883 - https://github.com/illumos/illumos-gate/commit/c9ba2a43cb Signed-off-by: Brian Behlendorf <[email protected]> Issue #340
* Illumos #1051: zfs should handle imbalanced lunsGeorge Wilson2011-08-011-0/+2
| | | | | | | | | | | | | | | | | | | | | | Today zfs tries to allocate blocks evenly across all devices. This means when devices are imbalanced zfs will use lots of CPU searching for space on devices which tend to be pretty full. It should instead fail quickly on the full LUNs and move onto devices which have more availability. Reviewed by: Eric Schrock <[email protected]> Reviewed by: Matt Ahrens <[email protected]> Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Albert Lee <[email protected]> Reviewed by: Gordon Ross <[email protected]> Approved by: Garrett D'Amore <[email protected]> References to Illumos issue and patch: - https://www.illumos.org/issues/510 - https://github.com/illumos/illumos-gate/commit/5ead3ed965 Signed-off-by: Brian Behlendorf <[email protected]> Issue #340
* Illumos #510: 'zfs get' enhancement - mountpoint as an argumentShampavman2011-08-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | The 'zfs get' command should be able to deal with mountpoint as an argument. It already works with 'zfs list' command: # zfs list /export/home/estibi NAME USED AVAIL REFER MOUNTPOINT rpool/export/home/estibi 1.14G 3.86G 1.14G /export/home/estibi but it fails with 'zfs get': # zfs get all /export/home/estibi cannot open '/export/home/estibi': invalid dataset name Reviewed by: Eric Schrock <[email protected]> Reviewed by: Deano <[email protected]> Reviewed by: Garrett D'Amore <[email protected]> Approved by: Garrett D'Amore <[email protected]> References to Illumos issue and patch: - https://www.illumos.org/issues/510 - https://github.com/illumos/illumos-gate/commit/5ead3ed965 Signed-off-by: Brian Behlendorf <[email protected]> Issue #340
* Provide a rc.d script for archlinuxzfs-0.6.0-rc5Kyle Fuller2011-07-1112-0/+12
| | | | | | | | | | | Unlike most other Linux distributions archlinux installs its init scripts in /etc/rc.d insead of /etc/init.d. This commit provides an archlinux rc.d script for zfs and extends the build infrastructure to ensure it get's installed in the correct place. Signed-off-by: Brian Behlendorf <[email protected]> Closes #322
* Update 'zfs send' documentationBrian Behlendorf2011-07-081-1/+1
| | | | | | | The -D and -p options were missing from the manpage. This commit adds documentation for these features. Closes #311
* Update ztest pathsBrian Behlendorf2011-07-061-1/+3
| | | | | | | Unfortunately, ztest is hard coded to export the zdb utility to be installed in a certain location. When the packaging was updated to install zdb in /sbin/ ztest was broken. To fix this I'm updating ztest to check both common install paths.
* Use consistent error message in zpool sub-commandPrasad Joshi2011-07-041-32/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The zpool sub-commands like iostat, list, and status should display consistent message when a given pool is unavailable or no pool is present. This change unifies the default behavior as follows: root@prasad:~# ./zpool list 1 2 no pools available no pools available root@prasad:~# ./zpool iostat 1 2 no pools available no pools available root@prasad:~# ./zpool status 1 2 no pools available no pools available root@prasad:~# ./zpool list tan 1 2 cannot open 'tan': no such pool root@prasad:~# ./zpool iostat tan 1 2 cannot open 'tan': no such pool root@prasad:~# ./zpool status tan 1 2 cannot open 'tan': no such pool Reported-by: Rajshree Thorat <[email protected]> Signed-off-by: Prasad Joshi <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #306
* Linux compat 2.6.39: mount_nodev()Brian Behlendorf2011-07-0113-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The .get_sb callback has been replaced by a .mount callback in the file_system_type structure. When using the new interface the caller must now use the mount_nodev() helper. Unfortunately, the new interface no longer passes the vfsmount down to the zfs layers. This poses a problem for the existing implementation because we currently save this pointer in the super block for latter use. It provides our only entry point in to the namespace layer for manipulating certain mount options. This needed to be done originally to allow commands like 'zfs set atime=off tank' to work properly. It also allowed me to keep more of the original Solaris code unmodified. Under Solaris there is a 1-to-1 mapping between a mount point and a file system so this is a fairly natural thing to do. However, under Linux they many be multiple entries in the namespace which reference the same filesystem. Thus keeping a back reference from the filesystem to the namespace is complicated. Rather than introduce some ugly hack to get the vfsmount and continue as before. I'm leveraging this API change to update the ZFS code to do things in a more natural way for Linux. This has the upside that is resolves the compatibility issue for the long term and fixes several other minor bugs which have been reported. This commit updates the code to remove this vfsmount back reference entirely. All modifications to filesystem mount options are now passed in to the kernel via a '-o remount'. This is the expected Linux mechanism and allows the namespace to properly handle any options which apply to it before passing them on to the file system itself. Aside from fixing the compatibility issue, removing the vfsmount has had the benefit of simplifying the code. This change which fairly involved has turned out nicely. Closes #246 Closes #217 Closes #187 Closes #248 Closes #231
* Linux compat 2.6.39: security_inode_init_security()Brian Behlendorf2011-07-0112-0/+12
| | | | | | | | | | | The security_inode_init_security() function now takes an additional qstr argument which must be passed in from the dentry if available. Passing a NULL is safe when no qstr is available the relevant security checks will just be skipped. Closes #246 Closes #217 Closes #187
* Tear down and flush the mmap regionPrasad Joshi2011-06-2712-0/+12
| | | | | | | | | | | | | | The inode eviction should unmap the pages associated with the inode. These pages should also be flushed to disk to avoid the data loss. Therefore, use truncate_setsize() in evict_inode() to release the pagecache. The API truncate_setsize() was added in 2.6.35 kernel. To ensure compatibility with the old kernel, the patch defines its own truncate_setsize function. Signed-off-by: Prasad Joshi <[email protected]> Closes #255
* Multipath device manageability improvementsNed A. Bass2011-06-237-60/+798
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Update udev helper scripts to deal with device-mapper devices created by multipathd. These enhancements are targeted at a particular storage network topology under evaluation at LLNL consisting of two SAS switches providing redundant connectivity between multiple server nodes and disk enclosures. The key to making these systems manageable is to create shortnames for each disk that conveys its physical location in a drawer. In a direct-attached topology we infer a disk's enclosure from the PCI bus number and HBA port number in the by-path name provided by udev. In a switched topology, however, multiple drawers are accessed via a single HBA port. We therefore resort to assigning drawer identifiers based on which switch port a drive's enclosure is connected to. This information is available from sysfs. Add options to zpool_layout to generate an /etc/zfs/zdev.conf using symbolic links in /dev/disk/by-id of the form <label>-<UUID>-switch-port:<X>-slot:<Y>. <label> is a string that depends on the subsystem that created the link and defaults to "dm-uuid-mpath" (this prefix is used by multipathd). <UUID> is a unique identifier for the disk typically obtained from the scsi_id program, and <X> and <Y> denote the switch port and disk slot numbers, respectively. Add a callout script sas_switch_id for use by multipathd to help create symlinks of the form described above. Update zpool_id and the udev zpool rules file to handle both multipath devices and conventional drives.
* Add "ashift" property to zpool createChristian Kohlschütter2011-06-173-12/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some disks with internal sectors larger than 512 bytes (e.g., 4k) can suffer from bad write performance when ashift is not configured correctly. This is caused by the disk not reporting its actual sector size, but a sector size of 512 bytes. The drive may behave this way for compatibility reasons. For example, the WDC WD20EARS disks are known to exhibit this behavior. When creating a zpool, ZFS takes that wrong sector size and sets the "ashift" property accordingly (to 9: 1<<9=512), whereas it should be set to 12 for 4k sectors (1<<12=4096). This patch allows an adminstrator to manual specify the known correct ashift size at 'zpool create' time. This can significantly improve performance in certain cases. However, it will have an impact on your total pool capacity. See the updated ashift property description in the zpool.8 man page for additional details. Valid values for the ashift property range from 9 to 17 (512B-128KB). Additionally, you may set the ashift to 0 if you wish to auto-detect the sector size based on what the disk reports, this is the default behavior. The most common ashift values are 9 and 12. Example: zpool create -o ashift=12 tank raidz2 sda sdb sdc sdd Closes #280 Original-patch-by: Richard Laager <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]>
* Handle /etc/mtab -> /proc/mounts symlinkBrian Behlendorf2011-06-141-1/+1
| | | | | | | | | | | Under Fedora 15 /etc/mtab is now a symlink to /proc/mounts by default. When /etc/mtab is a symlink the mount.zfs helper should not update it. There was code in place to handle this case but it used stat() which traverses the link and then issues the stat on /proc/mounts. We need to use lstat() to prevent the link traversal and instead stat /etc/mtab. Closes #270
* Always check -Wno-unused-but-set-variable gcc supportBrian Behlendorf2011-06-1411-11/+11
| | | | | | | | | | | The previous commit 8a7e1ceefa430988c8f888ca708ab307333b4464 wasn't quite right. This check applies to both the user and kernel space build and as such we must make sure it runs regardless of what the --with-config option is set too. For example, if --with-config=kernel then the autoconf test does not run and we generate build warnings when compiling the kernel packages.
* Check for -Wno-unused-but-set-variable gcc supportBrian Behlendorf2011-06-1411-8/+30
| | | | | | | | | | | | | Gcc versions 4.3.2 and earlier do not support the compiler flag -Wno-unused-but-set-variable. This can lead to build failures on older Linux platforms such as Debian Lenny. Since this is an optional build argument this changes add a new autoconf check for the option. If it is supported by the installed version of gcc then it is used otherwise it is omited. See commit's 12c1acde76683108441827ae9affba1872f3afe5 and 79713039a2b6e0ed223d141b4a8a8455f282d2f2 for the reason the -Wno-unused-but-set-variable options was originally added.
* Default to internal 'zfs userspace' implementationBrian Behlendorf2011-05-201-10/+0
| | | | | | | | | | | | | We will never bring over the pyzfs.py helper script from Solaris to Linux. Instead the missing functionality will be directly integrated in to the zfs commands and libraries. To avoid confusion remove the warning about the missing pyzfs.py utility and simply use the default internal support. The Illumous developers are of the same mind and have proposed an initial patch to do this which has been integrated in to the 'allow' development branch. After some additional testing this code can be merged in to master as the right long term solution.
* Fix awk usageBrian Behlendorf2011-05-062-4/+5
| | | | | | | | | | | | | | | The zpool_id and zpool_layout helper scripts have been updated to use the more common /usr/bin/awk symlink. On Fedora/Redhat systems there are both /bin/awk and /usr/bin/awk symlinks to your installed version of awk. On Debian/Ubuntu systems only the /usr/bin/awk symlink exists. Additionally, add the '\<' token to the beginning of the regex pattern to prevent partial matches. This pattern only appears to work with gawk despite the mawk man page claiming to support this extended regex. Thus you will need to have gawk installed to use these optional helper scripts. A comment has been added to the script to reflect this reality.
* Allow mounting of read-only snapshotszfs-0.6.0-rc4Brian Behlendorf2011-05-051-3/+8
| | | | | | | | With the addition of the mount helper we accidentally regressed the ability to manually mount snapshots. This commit updates the mount helper to expect the possibility of a ZFS_TYPE_SNAPSHOT. All snapshot will be automatically treated as 'legacy' type mounts so they can be mounted manually.
* Fix 'zfs set volsize=N pool/dataset'Brian Behlendorf2011-05-0211-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change fixes a kernel panic which would occur when resizing a dataset which was not open. The objset_t stored in the zvol_state_t will be set to NULL when the block device is closed. To avoid this issue we pass the correct objset_t as the third arg. The code has also been updated to correctly notify the kernel when the block device capacity changes. For 2.6.28 and newer kernels the capacity change will be immediately detected. For earlier kernels the capacity change will be detected when the device is next opened. This is a known limitation of older kernels. Online ext3 resize test case passes on 2.6.28+ kernels: $ dd if=/dev/zero of=/tmp/zvol bs=1M count=1 seek=1023 $ zpool create tank /tmp/zvol $ zfs create -V 500M tank/zd0 $ mkfs.ext3 /dev/zd0 $ mkdir /mnt/zd0 $ mount /dev/zd0 /mnt/zd0 $ df -h /mnt/zd0 $ zfs set volsize=800M tank/zd0 $ resize2fs /dev/zd0 $ df -h /mnt/zd0 Original-patch-by: Fajar A. Nugraha <[email protected]> Closes #68 Closes #84
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