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mirror_zfs/zfs_config.h.in

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Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* zfs_config.h.in. Generated from configure.ac by autoheader. */
/* invalidate_bdev() wants 1 arg */
#undef HAVE_1ARG_INVALIDATE_BDEV
/* bio_end_io_t wants 2 args */
#undef HAVE_2ARGS_BIO_END_IO_T
Linux compat 2.6.39: security_inode_init_security() 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
2011-05-19 23:47:32 +04:00
/* security_inode_init_security wants 6 args */
#undef HAVE_6ARGS_SECURITY_INODE_INIT_SECURITY
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* struct block_device_operations use bdevs */
#undef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS
/* bdev_logical_block_size() is available */
#undef HAVE_BDEV_LOGICAL_BLOCK_SIZE
Add backing_device_info per-filesystem 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 <behlendorf1@llnl.gov> Closes #174
2011-08-02 05:24:40 +04:00
/* struct super_block has s_bdi */
#undef HAVE_BDI
Simplify BDI integration 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 <behlendorf1@llnl.gov> Closes #367
2011-11-08 04:39:03 +04:00
/* bdi_setup_and_register() is available */
#undef HAVE_BDI_SETUP_AND_REGISTER
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* bio_empy_barrier() is defined */
#undef HAVE_BIO_EMPTY_BARRIER
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-11 01:40:38 +03:00
/* REQ_FAILFAST_MASK is defined */
#undef HAVE_BIO_REQ_FAILFAST_MASK
/* BIO_RW_FAILFAST is defined */
Add FAILFAST support 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.
2010-10-01 21:57:56 +04:00
#undef HAVE_BIO_RW_FAILFAST
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-11 01:40:38 +03:00
/* BIO_RW_FAILFAST_* are defined */
#undef HAVE_BIO_RW_FAILFAST_DTD
Linux 2.6.36 compat, synchronous bio flag The name of the flag used to mark a bio as synchronous has changed again in the 2.6.36 kernel due to the unification of the BIO_RW_* and REQ_* flags. The new flag is called REQ_SYNC. To simplify checking this flag I have introduced the vdev_disk_dio_is_sync() helper function. Based on the results of several new autoconf tests it uses the correct mask to check for a synchronous bio. Preferred interface for flagging a synchronous bio: 2.6.12-2.6.29: BIO_RW_SYNC 2.6.30-2.6.35: BIO_RW_SYNCIO 2.6.36-2.6.xx: REQ_SYNC
2010-11-11 02:49:40 +03:00
/* BIO_RW_SYNC is defined */
#undef HAVE_BIO_RW_SYNC
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* BIO_RW_SYNCIO is defined */
#undef HAVE_BIO_RW_SYNCIO
Linux 2.6.38 compat, blkdev_get_by_path() 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
2011-02-23 01:55:35 +03:00
/* blkdev_get_by_path() is available */
#undef HAVE_BLKDEV_GET_BY_PATH
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* blk_end_request() is available */
#undef HAVE_BLK_END_REQUEST
/* blk_end_request() is GPL-only */
#undef HAVE_BLK_END_REQUEST_GPL_ONLY
/* blk_fetch_request() is available */
#undef HAVE_BLK_FETCH_REQUEST
/* blk_requeue_request() is available */
#undef HAVE_BLK_REQUEUE_REQUEST
/* blk_rq_bytes() is available */
#undef HAVE_BLK_RQ_BYTES
/* blk_rq_bytes() is GPL-only */
#undef HAVE_BLK_RQ_BYTES_GPL_ONLY
/* blk_rq_pos() is available */
#undef HAVE_BLK_RQ_POS
/* blk_rq_sectors() is available */
#undef HAVE_BLK_RQ_SECTORS
Fix 'zfs set volsize=N pool/dataset' 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 <github@fajar.net> Closes #68 Closes #84
2011-02-25 10:36:01 +03:00
/* check_disk_size_change() is available */
#undef HAVE_CHECK_DISK_SIZE_CHANGE
Linux 2.6.35 compat, const struct xattr_handler 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.
2011-02-11 03:16:52 +03:00
/* super_block uses const struct xattr_hander */
#undef HAVE_CONST_XATTR_HANDLER
Linux 2.6.33 compat, get/set xattr callbacks The xattr handler prototypes were sanitized with the idea being that the same handlers could be used for multiple methods. The result of this was the inode type was changes to a dentry, and both the get() and set() hooks had a handler_flags argument added. The list() callback was similiarly effected but no autoconf check was added because we do not use the list() callback.
2011-02-11 21:33:01 +03:00
/* xattr_handler->get() wants dentry */
#undef HAVE_DENTRY_XATTR_GET
/* xattr_handler->set() wants dentry */
#undef HAVE_DENTRY_XATTR_SET
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
Implemented NFS export_operations. Implemented the required NFS operations for exporting ZFS datasets using the in-kernel NFS daemon.
2011-04-28 20:35:50 +04:00
/* d_obtain_alias() is available */
#undef HAVE_D_OBTAIN_ALIAS
Linux 2.6.36 compat, sops->evict_inode() 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.
2011-02-12 00:46:10 +03:00
/* sops->evict_inode() exists */
#undef HAVE_EVICT_INODE
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* kernel defines fmode_t */
#undef HAVE_FMODE_T
Linux 3.1 compat, super_block->s_shrink 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 <behlendorf1@llnl.gov> Closes #466 Closes #292
2011-12-23 00:20:43 +04:00
/* sops->free_cached_objects() exists */
#undef HAVE_FREE_CACHED_OBJECTS
Linux 3.1 compat, fops->fsync() The Linux 3.1 kernel updated the fops->fsync() callback yet again. They now pass the requested range and delegate the responsibility for calling filemap_write_and_wait_range() to the callback. In addition imutex is no longer held by the caller and the callback is responsible for taking the lock if required. This commit updates the code to provide a zpl_fsync() function for the updated API. Implementations for the previous two APIs are also maintained for compatibility. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #445
2011-11-10 08:47:59 +04:00
/* fops->fsync() with range */
#undef HAVE_FSYNC_RANGE
/* fops->fsync() without dentry */
#undef HAVE_FSYNC_WITHOUT_DENTRY
/* fops->fsync() with dentry */
#undef HAVE_FSYNC_WITH_DENTRY
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* blk_disk_ro() is available */
#undef HAVE_GET_DISK_RO
/* Define to 1 if licensed under the GPL */
#undef HAVE_GPL_ONLY_SYMBOLS
Linux 2.6.28 compat, insert_inode_locked() 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.
2011-03-22 19:55:09 +03:00
/* insert_inode_locked() is available */
#undef HAVE_INSERT_INODE_LOCKED
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* result=stropts.h Define to 1 if ioctl() defined in <stropts.h> */
#undef HAVE_IOCTL_IN_STROPTS_H
/* Define to 1 if ioctl() defined in <sys/ioctl.h> */
#undef HAVE_IOCTL_IN_SYS_IOCTL_H
/* Define to 1 if ioctl() defined in <unistd.h> */
#undef HAVE_IOCTL_IN_UNISTD_H
/* kernel defines KOBJ_NAME_LEN */
#undef HAVE_KOBJ_NAME_LEN
/* Define if you have libblkid */
#undef HAVE_LIBBLKID
Autoconf selinux support 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.
2010-12-17 01:26:08 +03:00
/* Define if you have selinux */
#undef HAVE_LIBSELINUX
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* Define if you have libuuid */
#undef HAVE_LIBUUID
/* Define to 1 if you have the `z' library (-lz). */
#undef HAVE_LIBZ
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
Linux compat 2.6.39: mount_nodev() 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
2011-05-19 22:44:07 +04:00
/* mount_nodev() is available */
#undef HAVE_MOUNT_NODEV
Linux 3.1 compat, super_block->s_shrink 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 <behlendorf1@llnl.gov> Closes #466 Closes #292
2011-12-23 00:20:43 +04:00
/* sops->nr_cached_objects() exists */
#undef HAVE_NR_CACHED_OBJECTS
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* open_bdev_exclusive() is available */
#undef HAVE_OPEN_BDEV_EXCLUSIVE
Linux 2.6.36 compat, synchronous bio flag The name of the flag used to mark a bio as synchronous has changed again in the 2.6.36 kernel due to the unification of the BIO_RW_* and REQ_* flags. The new flag is called REQ_SYNC. To simplify checking this flag I have introduced the vdev_disk_dio_is_sync() helper function. Based on the results of several new autoconf tests it uses the correct mask to check for a synchronous bio. Preferred interface for flagging a synchronous bio: 2.6.12-2.6.29: BIO_RW_SYNC 2.6.30-2.6.35: BIO_RW_SYNCIO 2.6.36-2.6.xx: REQ_SYNC
2010-11-11 02:49:40 +03:00
/* REQ_SYNC is defined */
#undef HAVE_REQ_SYNC
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* rq_for_each_segment() is available */
#undef HAVE_RQ_FOR_EACH_SEGMENT
/* rq_is_sync() is available */
#undef HAVE_RQ_IS_SYNC
Linux 3.2 compat: set_nlink() 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 <behlendorf1@llnl.gov> Closes: #462
2011-12-17 01:15:12 +04:00
/* set_nlink() is available */
#undef HAVE_SET_NLINK
Linux 3.1 compat, super_block->s_shrink 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 <behlendorf1@llnl.gov> Closes #466 Closes #292
2011-12-23 00:20:43 +04:00
/* struct super_block has s_shrink */
#undef HAVE_SHRINK
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
Tear down and flush the mmap region 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 <pjoshi@stec-inc.com> Closes #255
2011-06-25 16:30:29 +04:00
/* truncate_setsize() is available */
#undef HAVE_TRUNCATE_SETSIZE
Add initial autoconf products Add the initial products from autogen.sh. These products will be updated incrementally after this point as development occurs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 23:28:14 +04:00
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define if you have zlib */
#undef HAVE_ZLIB
/* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#undef LT_OBJDIR
/* Define to 1 if NPTL threading implementation includes guard area in stack
allocation */
#undef NPTL_GUARD_WITHIN_STACK
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Version number of package */
#undef VERSION
/* Define the project alias string. */
#undef ZFS_META_ALIAS
/* Define the project author. */
#undef ZFS_META_AUTHOR
/* Define the project release date. */
#undef ZFS_META_DATA
/* Define the project license. */
#undef ZFS_META_LICENSE
/* Define the libtool library 'age' version information. */
#undef ZFS_META_LT_AGE
/* Define the libtool library 'current' version information. */
#undef ZFS_META_LT_CURRENT
/* Define the libtool library 'revision' version information. */
#undef ZFS_META_LT_REVISION
/* Define the project name. */
#undef ZFS_META_NAME
/* Define the project release. */
#undef ZFS_META_RELEASE
/* Define the project version. */
#undef ZFS_META_VERSION
#undef PACKAGE
#undef PACKAGE_BUGREPORT
#undef PACKAGE_NAME
#undef PACKAGE_STRING
#undef PACKAGE_TARNAME
#undef PACKAGE_VERSION
#undef STDC_HEADERS
#undef VERSION
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