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* Retire zpool_id infrastructureBrian Behlendorf2013-01-295-286/+1
| | | | | | | | | | | | | | | | | | | In the interest of maintaining only one udev helper to give vdevs user friendly names, the zpool_id and zpool_layout infrastructure is being retired. They are superseded by vdev_id which incorporates all the previous functionality. Documentation for the new vdev_id(8) helper and its configuration file, vdev_id.conf(5), can be found in their respective man pages. Several useful example files are installed under /etc/zfs/. /etc/zfs/vdev_id.conf.alias.example /etc/zfs/vdev_id.conf.multipath.example /etc/zfs/vdev_id.conf.sas_direct.example /etc/zfs/vdev_id.conf.sas_switch.example Signed-off-by: Brian Behlendorf <[email protected]> Closes #981
* vdev_id support for device link aliasesNed Bass2012-12-032-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <[email protected]> Closes #981
* Remove autotools productsBrian Behlendorf2012-08-273-1802/+0
| | | | | | | | Remove all of the generated autotools products from the repository and update the .gitignore files accordingly. Signed-off-by: Brian Behlendorf <[email protected]> Closes #718
* Set zvol discard_granularity to the volblocksize.Etienne Dechamps2012-08-073-0/+3
| | | | | | | | | | | | | | | | | | Currently, zvols have a discard granularity set to 0, which suggests to the upper layer that discard requests of arbirarily small size and alignment can be made efficiently. In practice however, ZFS does not handle unaligned discard requests efficiently: indeed, it is unable to free a part of a block. It will write zeros to the specified range instead, which is both useless and inefficient (see dnode_free_range). With this patch, zvol block devices expose volblocksize as their discard granularity, so the upper layer is aware that it's not supposed to send discard requests smaller than volblocksize. Signed-off-by: Brian Behlendorf <[email protected]> Closes #862
* Linux 3.5 compat, end_writeback() changed to clear_inode()Richard Yao2012-07-233-0/+3
| | | | | | | | | | | | | | | | The end_writeback() function was changed by moving the call to inode_sync_wait() earlier in to evict(). This effecitvely changes the ordering of the sync but it does not impact the details of the zfs implementation. However, as part of this change end_writeback() was renamed to clear_inode() to reflect the new semantics. This change does impact us and clear_inode() now maps to end_writeback() for kernels prior to 3.5. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #784
* Linux 3.5 compat, iops->truncate_range() removedRichard Yao2012-07-233-0/+3
| | | | | | | | | The vmtruncate_range() support has been removed from the kernel in favor of using the fallocate method in the file_operations table. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #784
* Linux 3.5 compat, eops->encode_fh() takes inodesRichard Yao2012-07-233-0/+3
| | | | | | | | | | | | | | The export_operations member ->encode_fh() has been updated to take both the child and parent inodes. This interface used to take the child dentry and a bool describing if the parent is needed. NOTE: While updating this code I noticed that we do not currently cleanly handle the case where we're passed a connectable parent. This code should be audited to make sure we're doing the right thing. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #784
* Move partition scanning from userspace to module.Etienne Dechamps2012-07-173-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, zpool online -e (dynamic vdev expansion) doesn't work on whole disks because we're invoking ioctl(BLKRRPART) from userspace while ZFS still has a partition open on the disk, which results in EBUSY. This patch moves the BLKRRPART invocation from the zpool utility to the module. Specifically, this is done just before opening the device in vdev_disk_open() which is called inside vdev_reopen(). This requires jumping through some hoops to get to the disk device from the partition device, and to make sure we can still open the partition after the BLKRRPART call. Note that this new code path is triggered on dynamic vdev expansion only; other actions, like creating a new pool, are unchanged and still call BLKRRPART from userspace. This change also depends on API changes which are available in 2.6.37 and latter kernels. The build system has been updated to detect this, but there is no compatibility mode for older kernels. This means that online expansion will NOT be available in older kernels. However, it will still be possible to expand the vdev offline. Signed-off-by: Brian Behlendorf <[email protected]> Closes #808
* Relicense zfs.gentoo.in from GPLv2 to 2-clause BSDRichard Yao2012-07-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | As the Gentoo sys-fs/zfs maintainer, I receive license compatibility questions and at times, those questions can be harassing. I feel that the presence of the GPL in Gentoo's package metadata promotes such questions. zfs.gentoo.in is the only GPLv2 licensed file in ZFS, so I have taken the liberty of contacting all contributors to this file to request permission to relicense it. All of the contributors to this file have agreed to relicense it under the 2-clause BSD license. I have added their Signed-offs to this commit, in order of first contribution. Thank you everyone for being so understanding. Signed-off-by: devsk <[email protected]> Signed-off-by: Alexey Shvetsov <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Andrew Tselischev <[email protected]> Signed-off-by: Zachary Bedell <[email protected]> Signed-off-by: Gunnar Beutner <[email protected]> Signed-off-by: Kyle Fuller <[email protected]> Signed-off-by: Richard Yao <[email protected]> Closes #819
* Linux 3.4 compat, d_make_root() replaces d_alloc_root()Richard Yao2012-06-113-0/+3
| | | | | | | | | | | | | | | | | | | | torvalds/linux@adc0e91ab142abe93f5b0d7980ada8a7676231fe introduced introduced d_make_root() as a replacement for d_alloc_root(). Further commits appear to have removed d_alloc_root() from the Linux source tree. This causes the following failure: error: implicit declaration of function 'd_alloc_root' [-Werror=implicit-function-declaration] To correct this we update the code to use the current d_make_root() interface for readability. Then we introduce an autotools check to determine if d_make_root() is available. If it isn't then we define some compatibility logic which used the older d_alloc_root() interface. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #776
* Add vdev_id for JBOD-friendly udev aliasesNed A. Bass2012-06-015-0/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <[email protected]> Closes #713
* Linux 3.3 compat, iops->create()/mkdir()/mknod()Brian Behlendorf2012-04-303-0/+3
| | | | | | | | | | The mode argument of iops->create()/mkdir()/mknod() was changed from an 'int' to a 'umode_t'. To prevent a compiler warning an autoconf check was added to detect the API change and then correctly set a zpl_umode_t typedef. There is no functional change. Signed-off-by: Brian Behlendorf <[email protected]> Closes #701
* Make Gentoo initscript use modinfoRichard Yao2012-04-031-1/+1
| | | | | | | | | The -l parameter to modprobe has been removed from the latest upstream code and this change has entered Gentoo. Using modinfo as a substitute addresses this. Signed-off-by: Brian Behlendorf <[email protected]> Closes #636
* Add --enable-debug-dmu-tx configure optionBrian Behlendorf2012-03-233-0/+3
| | | | | | | | | | | | | | | | | | Allow rigorous (and expensive) tx validation to be enabled/disabled indepentantly from the standard zfs debugging. When enabled these checks ensure that all txs are constructed properly and that a dbuf is never dirtied without taking the correct tx hold. This checking is particularly helpful when adding new dmu consumers like Lustre. However, for established consumers such as the zpl with no known outstanding tx construction problems this is just overhead. --enable-debug-dmu-tx - Enable/disable validation of each tx as --disable-debug-dmu-tx it is constructed. By default validation is disabled due to performance concerns. Signed-off-by: Brian Behlendorf <[email protected]>
* Add .zfs control directoryBrian Behlendorf2012-03-223-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Cleanly support debug packagesBrian Behlendorf2012-02-273-0/+3
| | | | | | | | | | | | | | | | | | | 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]>
* Add support for DISCARD to ZVOLs.Etienne Dechamps2012-02-093-0/+3
| | | | | | | | | | | | | | | | | | | | 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 Dechamps2012-02-093-0/+3
| | | | | | | | | | | | | | 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 Dechamps2012-02-073-0/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Dechamps2012-02-073-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Behlendorf2012-02-033-0/+3
| | | | | | | | | | 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
* Linux 3.1 compat, super_block->s_shrinkBrian Behlendorf2012-01-113-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Linux 3.2 compat: set_nlink()Darik Horn2011-12-163-0/+3
| | | | | | | | | | | 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 Surya2011-12-143-0/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Quote variables in the zfs.lsb script.Darik Horn2011-12-051-16/+16
| | | | | | | | | For consistency and safety, quote all variables in the zfs.lsb script. This protects in the unlikely case that any of the file names contain whitespace. Signed-off-by: Brian Behlendorf <[email protected]> Issue #439
* Source /etc/default/zfs after setting defaults.Darik Horn2011-12-051-5/+3
| | | | | | | | | | | Let the administrator override all script variables by sourcing the /etc/default/zfs file after the default values are set. The spelling mistake in the old path name makes it unlikely that this bug affected any users. Signed-off-by: Brian Behlendorf <[email protected]> Closes: #371
* Simplify BDI integrationBrian Behlendorf2011-11-083-0/+3
| | | | | | | | | | | | | | 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
* Use automatic variable in MakefileNed Bass2011-09-262-2/+2
| | | | | | | | | | | As written, the $(init_SCRIPTS) rule in etc/init.d/Makefule.am would not work as expected if the init_SCRIPTS variable were to contain any elements other than zfs. Fix this by replacing the hard-coded 'zfs' reference with $@. Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #410
* Fix incorrect zpool_cache substitutionBrian Behlendorf2011-08-226-6/+6
| | | | | | | | | | This regression was accidentally introduced by commit aa2b489. I was attempting to simplify the init scripts and accidentally confused the /etc/init.d and /etc/zfs paths. This change reverts the init script modifications. Signed-off-by: Brian Behlendorf <[email protected]> Closes #370
* Fix autoconf variable substitution in init scripts.Brian Behlendorf2011-08-199-53/+128
| | | | | | | | Change the variable substitution in the init script templates according to the method described in the Autoconf manual; Chapter 4.7.2: Installation Directory Variables. Signed-off-by: Brian Behlendorf <[email protected]>
* Autogen refresh for udev changesBrian Behlendorf2011-08-083-1/+10
| | | | | | | | 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 Fuller2011-08-088-1206/+1
| | | | | | | | | | | | | | | | | | | 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 Behlendorf2011-08-045-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Add .gitignore for zfs.<distro> init scriptsBrian Behlendorf2011-08-011-0/+6
| | | | | | Treat the automatically generated zfs.<distro> init scripts as build products by adding them to a directory specific .gitignore file.
* Turn the init.d scripts into autoconf config filesKyle Fuller2011-08-017-34/+60
| | | | | | | | | | This change ensures the paths used by the provided init scripts always reference the prefixes provided at configure time. The @sbindir@ and @sysconfdir@ prefixes will be correctly replaced at build time. Signed-off-by: Brian Behlendorf <[email protected]> Closes #336
* Provide a rc.d script for archlinuxzfs-0.6.0-rc5Kyle Fuller2011-07-117-4/+67
| | | | | | | | | | | 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
* Check for "udevadm settle" vs "udevsettle"Fajar A. Nugraha2011-07-081-1/+5
| | | | | | | RHEL5 does not have udevadm, so fix initscript accordingly Signed-off-by: Brian Behlendorf <[email protected]> Closes #315
* Updated init scripts to enable automatic sharing of ZFS datasets.Gunnar Beutner2011-07-065-0/+25
| | | | | | | The relevant init scripts were updated so as to automatically share ZFS datasets using "zfs share -a" at boot time. Signed-off-by: Brian Behlendorf <[email protected]>
* Update zfs.gentoo/zfs.lsb init scriptZachary Bedell2011-07-062-11/+11
| | | | | | | | | * Update paths to zpool/zfs tools, * Log less for non-error conditions, * Don't be fatal if umount fails at shutdown -- final init remount will take care of it if /usr or / are in use Signed-off-by: Brian Behlendorf <[email protected]>
* Removed erroneous backticks in the zfs.lunar init script.Gunnar Beutner2011-07-051-2/+2
| | | | | | | | The backticks would cause the output of the zfs commands to be evaluated as input for the if construct rather than their exit status. Signed-off-by: Brian Behlendorf <[email protected]>
* Fixed indentation in the zfs.lunar init script.Gunnar Beutner2011-07-051-10/+10
| | | | | | One of the blocks in the init script wasn't indented properly. Signed-off-by: Brian Behlendorf <[email protected]>
* Fix 'rc_parallel="YES"' errorAndrew Tselischev2011-07-041-1/+1
| | | | | | | | If rc_parallel="YES" zfs starts before localmount, which leads to "No such file or directory" error on systems with /usr on a separate partition. Signed-off-by: Brian Behlendorf <[email protected]>
* Linux compat 2.6.39: mount_nodev()Brian Behlendorf2011-07-015-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Behlendorf2011-07-015-0/+5
| | | | | | | | | | | 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
* Ensure all block devices are availableBrian Behlendorf2011-06-305-0/+16
| | | | | | | | | | | | | These days most disk drivers will probe for devices asynchronously. This means it's possible that when you zfs init script runs all the required block devices may not yet have been discovered. The result is the pool may fail to cleanly import at boot time. This is particularly common when you have a large number of devices. The fix is for the init script to block until udev settles and we are no longer detecting new devices. Once the system has settled the zfs modules can be loaded and the pool with be automatically imported.
* Tear down and flush the mmap regionPrasad Joshi2011-06-275-0/+5
| | | | | | | | | | | | | | 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. Bass2011-06-231-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
* Autogen refresh.Darik Horn2011-06-171-8/+9
| | | | | | | | Run autogen.sh using the same autotools versions as upstream: * autoconf-2.63 * automake-1.11.1 * libtool-2.2.6b
* Fix autoconf variable substitution in udev rules.Darik Horn2011-06-173-3/+8
| | | | | | | | | | | | | | | | | | | | | | | | Change the variable substitution in the udev rule templates according to the method described in the Autoconf manual; Chapter 4.7.2: Installation Directory Variables. The udev rules are improperly generated if the bindir parameter overrides the prefix parameter during configure. For example: # ./configure --prefix=/usr/local --bindir=/opt/zfs/bin The udev helper is installed as /opt/zfs/bin/zpool_id, but the corresponding udev rule has a different path: # /usr/local/etc/udev/rules.d/60-zpool.rules ENV{DEVTYPE}=="disk", IMPORT{program}="/usr/local/bin/zpool_id -d %p" The @bindir@ variable expands to "${exec_prefix}/bin", so it cannot be used instead of @prefix@ directly. This also applies to the zvol_id helper. Closes #283.
* Always check -Wno-unused-but-set-variable gcc supportBrian Behlendorf2011-06-145-5/+5
| | | | | | | | | | | 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.
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