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* Linux 4.8 compat: rw_semaphore atomic_long_t countBrian Behlendorf2016-07-291-2/+5
| | | | | | | | | | | | | | For non-rwsem-spinlocks the "count" member was changed from a "long" to "atomic_long_t" type. A configure check has been added to detect this change along with new versions of the _rwsem_tryupgrade() function and RWSEM_COUNT() macro. See https://github.com/torvalds/linux/commit/8ee62b18 for complete details. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #563
* Implement a proper rw_tryupgradeChunwei Chen2016-05-311-0/+17
| | | | | | | | | | | | | | | | | | Current rw_tryupgrade does rw_exit and then rw_tryenter(RW_RWITER), and then does rw_enter(RW_READER) if it fails. This violate the assumption that rw_tryupgrade should be atomic and could cause extra contention or even lock inversion. This patch we implement a proper rw_tryupgrade. For rwsem-spinlock, we take the spinlock to check rwsem->count and rwsem->wait_list. For normal rwsem, we use cmpxchg on rwsem->count to change the value from single reader to single writer. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes zfsonlinux/zfs#4692 Closes #554
* Linux 4.7 compat: inode_lock() and friendsChunwei Chen2016-05-201-1/+18
| | | | | | | | | | | | | | | | Linux 4.7 changes i_mutex to i_rwsem, and we should used inode_lock and inode_lock_shared to do exclusive and shared lock respectively. We use spl_inode_lock{,_shared}() to hide the difference. Note that on older kernel you'll always take an exclusive lock. We also add all other inode_lock friends. And nested users now should explicitly call spl_inode_lock_nested with correct subclass. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue zfsonlinux/zfs#4665 Closes #549
* Fix lockdep warning in spl_inode_{lock,unlock}Olaf Faaland2015-12-111-1/+1
| | | | | | | | | | | | | | | | spl_inode_{lock,unlock} are triggering possible recursive locking warnings from lockdep. The warning is a false positive. The lock is used to protect a parent directory during delete/add operations, used in zfs when writing/removing the cache file. The inode lock is taken on both the parent inode and the file inode. VFS provides an enum to subclass the lock. This patch changes the spin_lock call to _nested version and uses the provided enum. Signed-off-by: Olaf Faaland <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #480
* Retire rwsem_is_locked() compatBrian Behlendorf2015-06-101-24/+0
| | | | | | | | | | | | | | | Stock Linux 2.6.32 and earlier kernels contained a broken version of rwsem_is_locked() which could return an incorrect value. Because of this compatibility code was added to detect the broken implementation and replace it with our own if needed. The fix for this issue was merged in to the mainline Linux kernel as of 2.6.33 and the major enterprise distributions based on 2.6.32 have all backported the fix. Therefore there is no longer a need to carry this code and it can be removed. Signed-off-by: Brian Behlendorf <[email protected]> Closes #454
* Retire spl_module_init()/spl_module_fini()Brian Behlendorf2015-02-272-60/+0
| | | | | | | | | | | | | | In the original implementation of the SPL wrappers were provided for module initialization and cleanup. This was done to abstract away any compatibility code which might be needed for the SPL. As it turned out the only significant compatibility issue was that the default pwd during module load differed under Illumos and Linux. Since this is such as minor thing and the wrappers complicate the code they are being retired. Signed-off-by: Brian Behlendorf <[email protected]> Issue zfsonlinux/zfs#2985
* Refactor existing codeBrian Behlendorf2015-01-161-3/+3
| | | | | | | | | | | | | | | | | This change introduces no functional changes to the memory management interfaces. It only restructures the existing codes by separating the kmem, vmem, and kmem cache implementations in the separate source and header files. Splitting this functionality in to separate files required the addition of spl_vmem_{init,fini}() and spl_kmem_cache_{initi,fini}() functions. Additionally, several minor changes to the #include's were required to accommodate the removal of extraneous header from kmem.h. But again, while large this patch introduces no functional changes. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove compat includes from sys/types.hNed Bass2014-11-191-0/+1
| | | | | | | | | | | | | | | | | | Don't include the compatibility code in linux/*_compat.h in the public header sys/types.h. This causes problems when an external code base includes the ZFS headers and has its own conflicting compatibility code. Lustre, in particular, defined SHRINK_STOP for compatibility with pre-3.12 kernels in a way that conflicted with the SPL's definition. Because Lustre ZFS OSD includes ZFS headers it fails to build due to a '"SHRINK_STOP" redefined' compiler warning. To avoid such conflicts only include the compat headers from .c files or private headers. Also, for consistency, include sys/*.h before linux/*.h then sort by header name. Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #411
* Kernel header installation should respect --prefixRichard Yao2014-10-281-1/+1
| | | | | | | | | | This is the upstream component of work that enables preliminary support for building Gentoo's ZFS packaging on other Linux systems via Gentoo Prefix. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #384
* Linux 3.12 compat: shrinker semanticsTim Chase2014-10-281-0/+7
| | | | | | | | | | | | | | | The new shrinker API as of Linux 3.12 modifies "struct shrinker" by replacing the @shrink callback with the pair of @count_objects and @scan_objects. It also requires the return value of @count_objects to return the number of objects actually freed whereas the previous @shrink callback returned the number of remaining freeable objects. This patch adds support for the new @scan_objects return value semantics and updates the splat shrinker test case appropriately. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Tim Chase <[email protected]> Closes #403
* Remove vfs_fsync() wrapperBrian Behlendorf2014-10-171-11/+6
| | | | | | | | | The vfs_fsync() function has been available since Linux 2.6.29. There is no longer a need to maintain this compatibility code. However, the HAVE_2ARGS_VFS_FSYNC check was left in place since that change occured after 2.6.32. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove proc_handler() wrapperBrian Behlendorf2014-10-172-97/+0
| | | | | | | | As of Linux 2.6.32 the proc handlers where updated to expect only five arguments. Therefore there is no longer a need to maintain this compatibility code and this infrastructure can be simplified. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove kallsyms_lookup_name() wrapperBrian Behlendorf2014-10-172-45/+0
| | | | | | | | | | After the removable of get_vmalloc_info(), the unused global memory variables, and the optional dcache/icache shrinkers there is no longer a need for the kallsyms compatibility code. This allows us to eliminate another brittle area of the code by removing the kernel upcall this functionality depended on for older kernels. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove shrink_{i,d}node_cache() wrappersBrian Behlendorf2014-10-171-96/+0
| | | | | | | | | This is optional functionality which may or may not be useful to ZFS when using older kernels. It is never a hard requirement. Therefore this functionality is being removed from the SPL and a simpler slimmed down version will be added to ZFS. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove global memory variablesBrian Behlendorf2014-10-171-16/+0
| | | | | | | | | | | | | | | | | | | | Platforms such as Illumos and FreeBSD have historically provided global variables which summerize the memory state of a system. Linux on the otherhand doesn't expose any of this information to kernel modules and uses entirely different mechanisms for memory management. In order to simplify the original ZFS port to Linux these global variables were emulated by the SPL for the benefit of ZFS. As ZoL has matured over the years it has moved steadily away from these interfaces and now no longer depends on them at all. Therefore, this patch completely removes the global variables availrmem, minfree, desfree, lotsfree, needfree, swapfs_minfree, and swapfs_reserve. This greatly simplifies the memory management code and eliminates a common area of confusion. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove on_each_cpu() wrapperBrian Behlendorf2014-10-172-41/+0
| | | | | | | The on_each_cpu() function has been available since Linux 2.6.27. There is no longer a need to maintain this compatibility code. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove mutex_lock_nested() wrapperBrian Behlendorf2014-10-172-37/+0
| | | | | | | The mutex_lock_nested() function has been available since Linux 2.6.18. There is no longer a need to maintain this compatibility code. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove i_mutex() configure checkBrian Behlendorf2014-10-171-9/+2
| | | | | | | | | | | The inode structure has used i_mutex as its internal locking primitive since 2.6.16. The compatibility code to check for the previous semaphore primitive has been removed. However, the wrapper function itself is being kept because it's entirely possible this primitive will change again to allow finer grained locking. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove linux/uaccess.h header checkBrian Behlendorf2014-10-172-36/+0
| | | | | | | | The uaccess header has been available in the same location since Linux 2.6.18. There is no longer a need to maintain this compatibility code. Signed-off-by: Brian Behlendorf <[email protected]>
* Simplify the time compatibility wrappersBrian Behlendorf2014-10-172-46/+0
| | | | | | | | | | Many of the time functions had grown overly complex in order to handle kernel compatibility issues. However, as of Linux 2.6.26 all the required functionality is available. This allows us to retire numerous configure checks and greatly simplify the time compatibility wrappers. Signed-off-by: Brian Behlendorf <[email protected]>
* Map highbit64() to fls64()Brian Behlendorf2014-10-171-12/+0
| | | | | | | | The fls64() function has been available since Linux 2.6.16 and it should be used to implemented highbit64(). This allows us to provide an optimized implementation and simplify the code. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove CTL_UNNUMBERED sysctl interfaceBrian Behlendorf2014-10-171-6/+0
| | | | | | | | | Support for the CTL_UNNUMBERED sysctl interface was removed in Linux 2.6.19. There is no longer any reason to maintain this compatibility code. There also issue any reason to keep around the CTL_NAME macro and helpers so they have been retired. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove register_sysctl() compatibility codeBrian Behlendorf2014-10-171-9/+0
| | | | | | | The register_sysctl() interface has been stable since Linux 2.6.21. There is no longer a need to maintain compatibility code. Signed-off-by: Brian Behlendorf <[email protected]>
* Cleanup vn_rename() and vn_remove()Richard Yao2014-08-131-18/+0
| | | | | | | | | | | | | | zfsonlinux/spl#bcb15891ab394e11615eee08bba1fd85ac32e158 implemented Linux 3.6+ support by adding duplicate vn_rename and vn_remove functions. The new ones were cleaner, but the duplicate functions made the codebase less maintainable. This adds some compatibility shims that allow us to retire the older vn_rename and vn_remove in favor of the new ones on old kernels. The result is a net 143 line reduction in lines of code and a cleaner codebase. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #370
* Linux 3.17 compat: remove wait_on_bit action functionNed Bass2014-08-112-0/+46
| | | | | | | | | | | | | | | | | | | Linux kernel 3.17 removes the action function argument from wait_on_bit(). Add autoconf test and compatibility macro to support the new interface. The former "wait_on_bit" interface required an 'action' function to be provided which does the actual waiting. There were over 20 such functions in the kernel, many of them identical, though most cases can be satisfied by one of just two functions: one which uses io_schedule() and one which just uses schedule(). This API change was made to consolidate all of those redundant wait functions. References: torvalds/linux@7431620 Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #378
* Linux 3.12 compat: New shrinker APIRichard Yao2013-11-061-83/+143
| | | | | | | | | | | | | | | | | | | | | | torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
* Emulate illumos interface cv_timedwait_hires()Ned Bass2013-11-042-0/+48
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Needed for Illumos #3582. This interface is supposed to support a variable-resolution timeout with nanosecond granularity. This implementation rounds up to microsecond resolution, as nanosecond- precision timing is rarely needed for real-world performance tuning and may incur unnecessary busy-waiting. usleep_range() is used if available, otherwise udelay() or msleep() are used depending on the length of the delay interval. Add flags from sys/callo.h as these are used to control the behavior of cv_timedwait_hires(). Specifically, CALLOUT_FLAG_ABSOLUTE Normally, the expiration passed to the timeout API functions is an expiration interval. If this flag is specified, then it is interpreted as the expiration time itself. CALLOUT_FLAG_ROUNDUP Roundup the expiration time to the next resolution boundary. If this flag is not specified, the expiration time is rounded down. References: https://www.illumos.org/issues/3582 illumos/illumos-gate@0689f76 Signed-off-by: Brian Behlendorf <[email protected]> Closes #304
* Linux 3.10 compat: Do not rely on struct proc_dir_entry definitionRichard Yao2013-07-081-3/+0
| | | | | | | | | | | | | | | | Linux kernel commit torvalds/linux#59d8053f moved the definition of struct proc_dir_entry from include/linux/proc_fs.h to the private header fs/proc/internal.h. The SPL relied on that to map Solaris' kstat to entries in /proc/spl/kstat. Since the proc_dir_entry structure is now private the only safe thing to do is wrap the opaque proc handle with our own structure. This actually ends up simplify the code and is good because it moves us away from depending on implementation details of /proc. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue #257
* Change spl-kmod-devel install pathBrian Behlendorf2013-03-141-1/+1
| | | | | | | | | | | | | | | Install the common spl kernel development headers under /usr/src/spl-<version>/ rather than in a kernel specific directory. The kernel specific build products such as spl_config.h and Modules.symvers are left installed under /usr/src/spl-<version>/<kernel>. This was done to be consistent with where dkms expects kernel module source to be packaged. It also allows for a common spl-kmod-devel package which includes the headers, and per-kernel spl-kmod-devel-<kernel> packages. Signed-off-by: Brian Behlendorf <[email protected]>
* Refresh links to web siteNed Bass2013-03-0416-16/+16
| | | | | | | Update links to refer to the official ZFS on Linux website instead of @behlendorf's personal fork on github. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove custom install-data-local for headersBrian Behlendorf2013-03-011-0/+28
| | | | | | | | | | | Rather than use a custom install target it is cleaner to define a 'kerneldir' and set 'kernel_HEADERS' appropriately. This allows us to leverage the standing configure install support. Additionally, I took this opertunity add the missing make files to the include subdirectories. Signed-off-by: Brian Behlendorf <[email protected]>
* Remove spl_invalidate_inodes()Brian Behlendorf2013-01-171-28/+0
| | | | | | | | | | | This functionality is no longer required by ZFS, see commit zfsonlinux/zfs@7b3e34ba5a7ee8d0fda44d214f6f11eb16cdb26f. Since there are no other consumers, and because it adds additional autoconf complexity which must be maintained the spl_invalidate_inodes() function has been removed. Signed-off-by: Brian Behlendorf <[email protected]> Issue zfsonlinux/zfs#795
* RHEL 6.4 compat, fallocate()Brian Behlendorf2013-01-081-0/+20
| | | | | | | | | | | | | | | | | In the upstream kernel the FALLOC_FL_PUNCH_HOLE #define was introduced after the fallocate() function was moved from the inode_operations to the file_operations structure. Therefore, the SPL code assumed that if FALLOC_FL_PUNCH_HOLE was defined it was safe to use f_ops->fallocate(). Unfortunately, the RHEL6.4 kernel has only backported the FALLOC_FL_PUNCH_HOLE #define and not the fallocate() change. To address this compatibility issue the spl_filp_fallocate() helper function was added to properly detect which interface is available. Signed-off-by: Brian Behlendorf <[email protected]>
* Fix spl_kmem_init_kallsyms_lookup() panicBrian Behlendorf2012-12-191-0/+1
| | | | | | | | | | | Due to I/O buffering the helper may return successfully before the proc handler has a chance to execute. To catch this case wait up to 1 second to verify spl_kallsyms_lookup_name_fn was updated to a non SYMBOL_POISON value. Signed-off-by: Brian Behlendorf <[email protected]> Closes zfsonlinux/zfs#699 Closes zfsonlinux/zfs#859
* Removed SPL_AC_3ARGS_INIT_WORK checkBrian Behlendorf2012-12-121-49/+0
| | | | | | | | | All consumers of the kernel delayed work queues have been shifted over to rely on the taskq implementation. This compatibility code can now be removed. Any new callers which need this functionality should use the taskq interfaces for delayed work items. Signed-off-by: Brian Behlendorf <[email protected]>
* Linux 3.7 compat, __clear_close_on_exec() removedBrian Behlendorf2012-10-181-4/+0
| | | | | | | | | | | | | | | | | | | | Commit torvalds/linux@b8318b0 moved the __clear_close_on_exec() function out of include/linux/fdtable.h and in to fs/file.c making it unavailable to the SPL. Now as it turns out we only used this function to tear down some test infrastructure for the vn_getf()/vn_releasef() SPLAT regression tests. Rather than implement even more autoconf compatibilty code to handle this we just remove the test case. This also allows us to drop three existing autoconf tests. This does mean the SPLAT tests will no longer verify these functions but historically they have never been a problem. And if we feel we absolutely need this test coverage I'm sure a more portable version of the test case could be added. Signed-off-by: Brian Behlendorf <[email protected]> Closes #183
* Linux 3.6 compat, kern_path_locked() addedYuxuan Shui2012-10-141-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The kern_path_parent() function was removed from Linux 3.6 because it was observed that all the callers just want the parent dentry. The simpler kern_path_locked() function replaces kern_path_parent() and does the lookup while holding the ->i_mutex lock. This is good news for the vn implementation because it removes the need for us to handle the locking. However, it makes it harder to implement a single readable vn_remove()/vn_rename() function which is usually what we prefer. Therefore, we implement a new version of vn_remove()/vn_rename() for Linux 3.6 and newer kernels. This allows us to leave the existing working implementation untouched, and to add a simpler version for newer kernels. Long term I would very much like to see all of the vn code removed since what this code enabled is generally frowned upon in the kernel. But that can't happen util we either abondon the zpool.cache file or implement alternate infrastructure to update is correctly in user space. Signed-off-by: Yuxuan Shui <[email protected]> Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #154
* Remove autotools productsBrian Behlendorf2012-08-271-414/+0
| | | | | | | | Remove all of the generated autotools products from the repository and update the .gitignore files accordingly. Signed-off-by: Brian Behlendorf <[email protected]> Issue zfsonlinux/zfs#718
* Optimize spl_rwsem_is_locked()Brian Behlendorf2012-07-131-42/+25
| | | | | | | | | | | | | | | | | The spl_rwsem_is_locked() compatibility function has been observed to be a hot spot. The root cause of this is that we must check the rwsem activity under the rwsem->wait_lock to avoid a race. When the lock is busy significant contention can occur. The upstream kernel fix for this race had the insight that by using spin_trylock_irqsave() this contention could be avoided. When the lock is contended it's reasonable to return that it is locked. This change updates the SPLs implemention to be like the upstream kernel. Since the kernel code has been in use for years now this a low risk change. Signed-off-by: Brian Behlendorf <[email protected]>
* Linux 3.4 compat, __clear_close_on_exec replaces FD_CLRRichard Yao2012-06-131-0/+4
| | | | | | | | | | | | | | | | | | | | torvalds/linux@1dce27c5aa6770e9d195f2bb7db1db3d4dde5591 introduced __clear_close_on_exec() as a replacement for FD_CLR. Further commits appear to have removed FD_CLR from the Linux source tree. This causes the following failure: error: implicit declaration of function '__FD_CLR' [-Werror=implicit-function-declaration] To correct this we update the code to use the current __clear_close_on_exec() interface for readability. Then we introduce an autotools check to determine if __clear_close_on_exec() is available. If it isn't then we define some compatibility logic which used the older FD_CLR() interface. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #124
* Linux 3.2 compat: rw_semaphore.wait_lock is rawDarik Horn2012-01-111-8/+28
| | | | | | | | | | | | | | | | | | The wait_lock member of the rw_semaphore struct became a raw_spinlock_t in Linux 3.2 at torvalds/linux@ddb6c9b58a19edcfac93ac670b066c836ff729f1. Wrap spin_lock_* function calls in a new spl_rwsem_* interface to ensure type safety if raw_spinlock_t becomes architecture specific, and to satisfy these compiler warnings: warning: passing argument 1 of ‘spinlock_check’ from incompatible pointer type [enabled by default] note: expected ‘struct spinlock_t *’ but argument is of type ‘struct raw_spinlock_t *’ Signed-off-by: Brian Behlendorf <[email protected]> Closes: #76 Closes: zfsonlinux/zfs#463
* Proxmox VE kernel compat, invalidate_inodes()Brian Behlendorf2011-12-211-2/+2
| | | | | | | | | | | | The Proxmox VE kernel contains a patch which renames the function invalidate_inodes() to invalidate_inodes_check(). In the process it adds a 'check' argument and a '#define invalidate_inodes(x)' compatibility wrapper for legacy callers. Therefore, if either of these functions are exported invalidate_inodes() can be safely used. Signed-off-by: Brian Behlendorf <[email protected]> Closes #58
* Prepend spl_ to all init/fini functionsBrian Behlendorf2011-11-111-2/+2
| | | | | | | | | | This is a bit of cleanup I'd been meaning to get to for a while to reduce the chance of a type conflict. Well that conflict finally occurred with the kstat_init() function which conflicts with a function in the 2.6.32-6-pve kernel. Signed-off-by: Brian Behlendorf <[email protected]> Closes #56
* Linux 3.1 compat, shrink_*cache_memoryBrian Behlendorf2011-11-091-6/+48
| | | | | | | | | | | | | | | | | | | | | | As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <[email protected]> Issue #52
* Linux 3.1 compat, vfs_fsync()Brian Behlendorf2011-11-091-5/+9
| | | | | | | | | | | Preferentially use the vfs_fsync() function. This function was initially introduced in 2.6.29 and took three arguments. As of 2.6.35 the dentry argument was dropped from the function. For older kernels fall back to using file_fsync() which also took three arguments including the dentry. Signed-off-by: Brian Behlendorf <[email protected]> Issue #52
* Linux 3.1 compat, kern_path_parent()Brian Behlendorf2011-11-091-4/+10
| | | | | | | | | | Prior to Linux 3.1 the kern_path_parent symbol was exported for use by kernel modules. As of Linux 3.1 it is now longer easily available. To handle this case the spl will now dynamically look up address of the missing symbol at module load time. Signed-off-by: Brian Behlendorf <[email protected]> Issue #52
* Linux 3.0: Shrinker compatibilityBrian Behlendorf2011-06-211-23/+106
| | | | | | | | Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
* Linux 2.6.39 compat, zlib_deflate_workspacesize()Brian Behlendorf2011-04-201-0/+37
| | | | | | | | | | | | | The function zlib_deflate_workspacesize() now take 2 arguments. This was done to avoid always having to allocate the maximum size workspace (268K). The caller can now specific the windowBits and memLevel compression parameters to get a smaller workspace. For our purposes we introduce a spl_zlib_deflate_workspacesize() wrapper which accepts both arguments. When the two argument version of zlib_deflate_workspacesize() is available the arguments are passed through. When it's not we assume the worst case and a maximally sized workspace is used.
* Linux 2.6.39 compat, kern_path_parent()Brian Behlendorf2011-04-201-0/+6
| | | | | | | The path_lookup() function has been renamed to kern_path_parent() and the flags argument has been removed. The only behavior now offered is that of LOOKUP_PARENT. The spl already always passed this flag so dropping the flag does not impact us.
* Linux 2.6.39 compat, invalidate_inodes()Brian Behlendorf2011-04-191-2/+18
| | | | | | | | To resolve a potiential filesystem corruption issue a second argument was added to invalidate_inodes(). This argument controls whether dirty inodes are dropped or treated as busy when invalidating a super block. When only the legacy API is available the second argument will be dropped for compatibility.
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