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* Linux 3.1 compat, super_block->s_shrinkBrian Behlendorf2012-01-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Horn2011-12-161-0/+1
| | | | | | | | | | | 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 Surya2011-12-141-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Simplify BDI integrationBrian Behlendorf2011-11-081-0/+1
| | | | | | | | | | | | | | 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
* Autogen refresh for udev changesBrian Behlendorf2011-08-081-0/+3
| | | | | | | | Run autogen.sh using the same autotools versions as upstream: * autoconf-2.63 * automake-1.11.1 * libtool-2.2.6b
* Add backing_device_info per-filesystemBrian Behlendorf2011-08-041-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Provide a rc.d script for archlinuxzfs-0.6.0-rc5Kyle Fuller2011-07-111-0/+1
| | | | | | | | | | | 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
* Linux compat 2.6.39: mount_nodev()Brian Behlendorf2011-07-011-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Behlendorf2011-07-011-0/+1
| | | | | | | | | | | 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 Joshi2011-06-271-0/+1
| | | | | | | | | | | | | | 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/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
* Always check -Wno-unused-but-set-variable gcc supportBrian Behlendorf2011-06-141-1/+1
| | | | | | | | | | | 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 Behlendorf2011-06-141-0/+2
| | | | | | | | | | | | | 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.
* Fix 'zfs set volsize=N pool/dataset'Brian Behlendorf2011-05-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Implemented NFS export_operations.Gunnar Beutner2011-04-291-0/+1
| | | | | Implemented the required NFS operations for exporting ZFS datasets using the in-kernel NFS daemon.
* Linux 2.6.28 compat, insert_inode_locked()Brian Behlendorf2011-03-221-0/+1
| | | | | | | Added insert_inode_locked() helper function, prior to this most callers used insert_inode_hash(). The older method doesn't check for collisions in the inode_hashtable but it still acceptible for use. Fallback to using insert_inode_hash() when insert_inode_locked() is unavailable.
* Add init scriptsBrian Behlendorf2011-03-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | To support automatically mounting your zfs on filesystem on boot a basic init script is needed. Unfortunately, every distribution has their own idea of the _right_ way to do things. Rather than write one very complicated portable init script, which would be invariably replaced by the distributions own anyway. I have instead added support to provide multiple distribution specific init scripts. The correct init script for your distribution will be selected by ZFS_AC_DEFAULT_PACKAGE which will set DEFAULT_INIT_SCRIPT. During 'make install' the correct script for your system will be installed from zfs/etc/init.d/zfs.DEFAULT_INIT_SCRIPT to the usual /etc/init.d/zfs location. Currently, there is zfs.fedora and a more generic zfs.lsb init script. Hopefully, the distribution maintainers who know best how they want their init scripts to function will feedback their approved versions to be included in the project. This change does not consider upstart jobs but I'm not at all opposed to add that sort of thing.
* Fix mount helperBrian Behlendorf2011-03-091-1/+2
| | | | | | | | | | | | | | | | | Several issues related to strange mount/umount behavior were reported and this commit should address most of them. The original idea was to put in place a zfs mount helper (mount.zfs). This helper is used to enforce 'legacy' mount behavior, and perform any extra mount argument processing (selinux, zfsutil, etc). This helper wasn't ready for the 0.6.0-rc1 release but with this change it's functional but needs to extensively tested. This change addresses the following open issues. Closes #101 Closes #107 Closes #113 Closes #115 Closes #119
* Use udev to create /dev/zvol/[dataset_name] linksFajar A. Nugraha2011-02-251-1/+1
| | | | | | | | | | | | | | | | | This commit allows zvols with names longer than 32 characters, which fixes issue on https://github.com/behlendorf/zfs/issues/#issue/102. Changes include: - use /dev/zd* device names for zvol, where * is the device minor (include/sys/fs/zfs.h, module/zfs/zvol.c). - add BLKZNAME ioctl to get dataset name from userland (include/sys/fs/zfs.h, module/zfs/zvol.c, cmd/zvol_id). - add udev rule to create /dev/zvol/[dataset_name] and the legacy /dev/[dataset_name] symlink. For partitions on zvol, it will create /dev/zvol/[dataset_name]-part* (etc/udev/rules.d/60-zvol.rules, cmd/zvol_id). Signed-off-by: Brian Behlendorf <[email protected]>
* Linux 2.6.38 compat, blkdev_get_by_path()Brian Behlendorf2011-02-231-0/+1
| | | | | | | | | | | The open_bdev_exclusive() function has been replaced (again) by the more generic blkdev_get_by_path() function. Additionally, the counterpart function close_bdev_exclusive() has been replaced by blkdev_put(). Because these functions are more generic versions of the functions they replaced the compatibility macro must add the FMODE_EXCL mask to ensure they are exclusive. Closes #114
* Linux 2.6.36 compat, sops->evict_inode()Brian Behlendorf2011-02-111-0/+1
| | | | | | The new prefered inteface for evicting an inode from the inode cache is the ->evict_inode() callback. It replaces both the ->delete_inode() and ->clear_inode() callbacks which were previously used for this.
* Linux 2.6.35 compat, fops->fsync()Brian Behlendorf2011-02-111-0/+1
| | | | | | | | | The fsync() callback in the file_operations structure used to take 3 arguments. The callback now only takes 2 arguments because the dentry argument was determined to be unused by all consumers. To handle this a compatibility prototype was added to ensure the right prototype is used. Our implementation never used the dentry argument either so it's just a matter of using the right prototype.
* Linux 2.6.35 compat, const struct xattr_handlerBrian Behlendorf2011-02-101-0/+1
| | | | | | | The const keyword was added to the 'struct xattr_handler' in the generic Linux super_block structure. To handle this we define an appropriate xattr_handler_t typedef which can be used. This was the preferred solution because it keeps the code clean and readable.
* Minimal libshare infrastructureBrian Behlendorf2011-02-041-1/+0
| | | | | | | | | | | | | | | | | | ZFS even under Solaris does not strictly require libshare to be available. The current implementation attempts to dlopen() the library to access the needed symbols. If this fails libshare support is simply disabled. This means that on Linux we only need the most minimal libshare implementation. In fact just enough to prevent the build from failing. Longer term we can decide if we want to implement a libshare library like Solaris. At best this would be an abstraction layer between ZFS and NFS/SMB. Alternately, we can drop libshare entirely and directly integrate ZFS with Linux's NFS/SMB. Finally the bare bones user-libshare.m4 test was dropped. If we do decide to implement libshare at some point it will surely be as part of this package so the check is not needed.
* Autoconf selinux supportBrian Behlendorf2011-01-281-0/+2
| | | | | | | | | | | | | | | | | If libselinux is detected on your system at configure time link against it. This allows us to use a library call to detect if selinux is enabled and if it is to pass the mount option: "context=\"system_u:object_r:file_t:s0" For now this is required because none of the existing selinux policies are aware of the zfs filesystem type. Because of this they do not properly enable xattr based labeling even though zfs supports all of the required hooks. Until distro's add zfs as a known xattr friendly fs type we must use mntpoint labeling. Alternately, end users could modify their existing selinux policy with a little guidance.
* Add FAILFAST supportBrian Behlendorf2010-10-121-0/+1
| | | | | | | | | | | | | | | | | | | | ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
* Support custom build directories and move includesBrian Behlendorf2010-09-081-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One of the neat tricks an autoconf style project is capable of is allow configurion/building in a directory other than the source directory. The major advantage to this is that you can build the project various different ways while making changes in a single source tree. For example, this project is designed to work on various different Linux distributions each of which work slightly differently. This means that changes need to verified on each of those supported distributions perferably before the change is committed to the public git repo. Using nfs and custom build directories makes this much easier. I now have a single source tree in nfs mounted on several different systems each running a supported distribution. When I make a change to the source base I suspect may break things I can concurrently build from the same source on all the systems each in their own subdirectory. wget -c http://github.com/downloads/behlendorf/zfs/zfs-x.y.z.tar.gz tar -xzf zfs-x.y.z.tar.gz cd zfs-x-y-z ------------------------- run concurrently ---------------------- <ubuntu system> <fedora system> <debian system> <rhel6 system> mkdir ubuntu mkdir fedora mkdir debian mkdir rhel6 cd ubuntu cd fedora cd debian cd rhel6 ../configure ../configure ../configure ../configure make make make make make check make check make check make check This change also moves many of the include headers from individual incude/sys directories under the modules directory in to a single top level include directory. This has the advantage of making the build rules cleaner and logically it makes a bit more sense.
* Add initial autoconf productsBrian Behlendorf2010-08-311-0/+645
Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <[email protected]>