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* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* spl_config.h.in. Generated from configure.ac by autoheader. */
Use Linux atomic primitives by default. Previously Solaris style atomic primitives were implemented simply by wrapping the desired operation in a global spinlock. This was easy to implement at the time when I wasn't 100% sure I could safely layer the Solaris atomic primatives on the Linux counterparts. It however was likely not good for performance. After more investigation however it does appear the Solaris primitives can be layered on Linux's fairly safely. The Linux atomic_t type really just wraps a long so we can simply cast the Solaris unsigned value to either a atomic_t or atomic64_t. The only lingering problem for both implementations is that Solaris provides no atomic read function. This means reading a 64-bit value on a 32-bit arch can (and will) result in word breaking. I was very concerned about this initially, but upon further reflection it is a limitation of the Solaris API. So really we are just being bug-for-bug compatible here. With this change the default implementation is layered on top of Linux atomic types. However, because we're assuming a lot about the internal implementation of those types I've made it easy to fall-back to the generic approach. Simply build with --enable-atomic_spinlocks if issues are encountered with the new implementation.
2009-10-30 17:55:25 +00:00
/* Atomic types use spinlocks */
#undef ATOMIC_SPINLOCK
Autoconf --enable-debug-* cleanup Cleanup the --enable-debug-* configure options, this has been pending for quite some time and I am glad I finally got to it. To summerize: 1) All SPL_AC_DEBUG_* macros were updated to be a more autoconf friendly. This mainly involved shift to the GNU approved usage of AC_ARG_ENABLE and ensuring AS_IF is used rather than directly using an if [ test ] construct. 2) --enable-debug-kmem=yes by default. This simply enabled keeping a running tally of total memory allocated and freed and reporting a memory leak if there was one at module unload. Additionally, it ensure /proc/spl/kmem/slab will exist by default which is handy. The overhead is low for this and it should not impact performance. 3) --enable-debug-kmem-tracking=no by default. This option was added to provide a configure option to enable to detailed memory allocation tracking. This support was always there but you had to know where to turn it on. By default this support is disabled because it is known to badly hurt performence, however it is invaluable when chasing a memory leak. 4) --enable-debug-kstat removed. After further reflection I can't see why you would ever really want to turn this support off. It is now always on which had the nice side effect of simplifying the proc handling code in spl-proc.c. We can now always assume the top level directory will be there. 5) --enable-debug-callb removed. This never really did anything, it was put in provisionally because it might have been needed. It turns out it was not so I am just removing it to prevent confusion.
2009-10-30 20:58:51 +00:00
/* Define to 1 to enable basic kmem accounting */
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
#undef DEBUG_KMEM
Autoconf --enable-debug-* cleanup Cleanup the --enable-debug-* configure options, this has been pending for quite some time and I am glad I finally got to it. To summerize: 1) All SPL_AC_DEBUG_* macros were updated to be a more autoconf friendly. This mainly involved shift to the GNU approved usage of AC_ARG_ENABLE and ensuring AS_IF is used rather than directly using an if [ test ] construct. 2) --enable-debug-kmem=yes by default. This simply enabled keeping a running tally of total memory allocated and freed and reporting a memory leak if there was one at module unload. Additionally, it ensure /proc/spl/kmem/slab will exist by default which is handy. The overhead is low for this and it should not impact performance. 3) --enable-debug-kmem-tracking=no by default. This option was added to provide a configure option to enable to detailed memory allocation tracking. This support was always there but you had to know where to turn it on. By default this support is disabled because it is known to badly hurt performence, however it is invaluable when chasing a memory leak. 4) --enable-debug-kstat removed. After further reflection I can't see why you would ever really want to turn this support off. It is now always on which had the nice side effect of simplifying the proc handling code in spl-proc.c. We can now always assume the top level directory will be there. 5) --enable-debug-callb removed. This never really did anything, it was put in provisionally because it might have been needed. It turns out it was not so I am just removing it to prevent confusion.
2009-10-30 20:58:51 +00:00
/* Define to 1 to enable detailed kmem tracking */
#undef DEBUG_KMEM_TRACKING
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
Add --enable-debug-log configure option Until now the notion of an internal debug logging infrastructure was conflated with enabling ASSERT()s. This patch clarifies things by cleanly breaking the two subsystem apart. The result of this is the following behavior. --enable-debug - Enable/disable code wrapped in ASSERT()s. --disable-debug ASSERT()s are used to check invariants and are never required for correct operation. They are disabled by default because they may impact performance. --enable-debug-log - Enable/disable the debug log infrastructure. --disable-debug-log This infrastructure allows the spl code and its consumer to log messages to an in-kernel log. The granularity of the logging can be controlled by a debug mask. By default the mask disables most debug messages resulting in a negligible performance impact. Because of this the debug log is enabled by default. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2012-01-21 00:39:12 +00:00
/* Define to 1 to enable basic debug logging */
#undef DEBUG_LOG
Linux 2.6.39 compat, invalidate_inodes() 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.
2011-04-18 20:47:43 +00:00
/* invalidate_inodes() wants 2 args */
#undef HAVE_2ARGS_INVALIDATE_INODES
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* register_sysctl_table() wants 2 args */
#undef HAVE_2ARGS_REGISTER_SYSCTL
Set cwd to '/' for the process executing insmod. Ricardo has pointed out that under Solaris the cwd is set to '/' during module load, while under Linux it is set to the callers cwd. To handle this cleanly I've reworked the module *_init()/_exit() macros so they call a *_setup()/_cleanup() function when any SPL dependent module is loaded or unloaded. This gives us a chance to perform any needed modification of the process, in this case changing the cwd. It also handily provides a way to avoid creating wrapper init()/exit() functions because the Solaris and Linux prototypes differ slightly. All dependent modules should now call the spl helper macros spl_module_{init,exit}() instead of the native linux versions. Unfortunately, it appears that under Linux there has been no consistent API in the kernel to set the cwd in a module. Because of this I have had to add more autoconf magic than I'd like. However, what I have done is correct and has been tested on RHEL5, SLES11, FC11, and CHAOS kernels. In addition, I have change the rootdir type from a 'void *' to the correct 'vnode_t *' type. And I've set rootdir to a non-NULL value.
2009-10-01 23:06:15 +00:00
/* set_fs_pwd() wants 2 args */
#undef HAVE_2ARGS_SET_FS_PWD
Linux 3.1 compat, vfs_fsync() 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 <behlendorf1@llnl.gov> Issue #52
2011-11-09 20:45:35 +00:00
/* vfs_fsync() wants 2 args */
#undef HAVE_2ARGS_VFS_FSYNC
SLES10 Fixes (part 4): - Configure check for SLES specific API change to vfs_unlink() and vfs_rename() which added a 'struct vfsmount *' argument. This was for something called the linux-security-module, but it appears that it was never adopted upstream.
2009-05-20 18:31:55 +00:00
/* vfs_unlink() wants 2 args */
#undef HAVE_2ARGS_VFS_UNLINK
Linux 2.6.39 compat, zlib_deflate_workspacesize() 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.
2011-04-20 21:22:35 +00:00
/* zlib_deflate_workspacesize() wants 2 args */
#undef HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* INIT_WORK wants 3 args */
#undef HAVE_3ARGS_INIT_WORK
2.6.27+ portability changes - Added SPL_AC_3ARGS_ON_EACH_CPU configure check to determine if the older 4 argument version of on_each_cpu() should be used or the new 3 argument version. The retry argument was dropped in the new API which was never used anyway. - Updated work queue compatibility wrappers. The old way this worked was to pass a data point when initialized the workqueue. The new API assumed the work item is embedding in a structure and we us container_of() to find that data pointer. - Updated skc->skc_flags to be an unsigned long which is now type checked in the bit operations. This silences the warnings. - Updated autogen products and splat tests accordingly
2009-02-02 23:12:30 +00:00
/* on_each_cpu wants 3 args */
#undef HAVE_3ARGS_ON_EACH_CPU
Fix 2.6.35 shrinker callback API change As of linux-2.6.35 the shrinker callback API now takes an additional argument. The shrinker struct is passed to the callback so that users can embed the shrinker structure in private data and use container_of() to access it. This removes the need to always use global state for the shrinker. To handle this we add the SPL_AC_3ARGS_SHRINKER_CALLBACK autoconf check to properly detect the API. Then we simply setup a callback function with the correct number of arguments. For now we do not make use of the new 3rd argument.
2010-10-22 21:16:43 +00:00
/* shrinker callback wants 3 args */
#undef HAVE_3ARGS_SHRINKER_CALLBACK
SLES10 Fixes (part 4): - Configure check for SLES specific API change to vfs_unlink() and vfs_rename() which added a 'struct vfsmount *' argument. This was for something called the linux-security-module, but it appears that it was never adopted upstream.
2009-05-20 18:31:55 +00:00
/* vfs_rename() wants 4 args */
#undef HAVE_4ARGS_VFS_RENAME
Added SPL_AC_5ARGS_DEVICE_CREATE autoconf configure check As of 2.6.27 kernels the device_create() API changed to include a private data argument. This check detects which version of device_create() function the kernel has and properly defines spl_device_create() to use the correct prototype.
2009-03-13 20:38:43 +00:00
/* device_create wants 5 args */
#undef HAVE_5ARGS_DEVICE_CREATE
Linux 2.6.32 compat, proc_handler() API change As of linux-2.6.32 the 'struct file *filp' argument was dropped from the proc_handle() prototype. It was apparently unused _almost_ everywhere in the kernel and this was simply cleanup. I've added a new SPL_AC_5ARGS_PROC_HANDLER autoconf check for this and the proper compat macros to correctly define the prototypes and some helper functions. It's not pretty but API compat changes rarely are.
2010-03-04 20:14:56 +00:00
/* proc_handler() wants 5 args */
#undef HAVE_5ARGS_PROC_HANDLER
Add autoconf checks for atomic64_cmpxchg + atomic64_xchg These functions didn't exist for all archs prior to 2.6.24. This patch addes an autoconf test to detect this and add them when needed. The autoconf check is needed instead of just an #ifndef because in the most modern kernels atomic64_{cmp}xchg are implemented as in inline function and not a #define.
2009-10-30 20:53:17 +00:00
/* kernel defines atomic64_cmpxchg */
#undef HAVE_ATOMIC64_CMPXCHG
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* kernel defines atomic64_t */
#undef HAVE_ATOMIC64_T
Add autoconf checks for atomic64_cmpxchg + atomic64_xchg These functions didn't exist for all archs prior to 2.6.24. This patch addes an autoconf test to detect this and add them when needed. The autoconf check is needed instead of just an #ifndef because in the most modern kernels atomic64_{cmp}xchg are implemented as in inline function and not a #define.
2009-10-30 20:53:17 +00:00
/* kernel defines atomic64_xchg */
#undef HAVE_ATOMIC64_XCHG
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* class_device_create() is available */
#undef HAVE_CLASS_DEVICE_CREATE
Linux 3.4 compat, __clear_close_on_exec replaces FD_CLR 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 <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #124
2012-06-06 16:51:53 +00:00
/* __clear_close_on_exec() is available */
#undef HAVE_CLEAR_CLOSE_ON_EXEC
Add basic credential support and splat tests. The previous credential implementation simply provided the needed types and a couple of dummy functions needed. This update correctly ties the basic Solaris credential API in to one of two Linux kernel APIs. Prior to 2.6.29 the linux kernel embeded all credentials in the task structure. For these kernels, we pass around the entire task struct as if it were the credential, then we use the helper functions to extract the credential related bits. As of 2.6.29 a new credential type was added which we can and do fairly cleanly layer on top of. Once again the helper functions nicely hide the implementation details from all callers. Three tests were added to the splat test framework to verify basic correctness. They should be extended as needed when need credential functions are added.
2009-07-28 00:18:59 +00:00
/* struct cred exists */
#undef HAVE_CRED_STRUCT
Linux-2.6.33 compat, .ctl_name removed from struct ctl_table As of linux-2.6.33 the ctl_name member of the ctl_table struct has been entirely removed. The upstream code has been updated to depend entirely on the the procname member. To handle this all references to ctl_name are wrapped in a CTL_NAME macro which simply expands to nothing for newer kernels. Older kernels are supported by having it expand to .ctl_name = X just as before.
2010-06-30 17:36:20 +00:00
/* struct ctl_table has ctl_name */
#undef HAVE_CTL_NAME
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* unnumbered sysctl support exists */
#undef HAVE_CTL_UNNUMBERED
/* device_create() is available */
#undef HAVE_DEVICE_CREATE
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* linux/fdtable.h exists */
#undef HAVE_FDTABLE_HEADER
/* files_fdtable() is available */
#undef HAVE_FILES_FDTABLE
Linux VM integration / device special files Support added to provide reasonable values for the global Solaris VM variables: minfree, desfree, lotsfree, needfree. These values are set to the sum of their per-zone linux counterparts which should be close enough for Solaris consumers. When a non-GPL app links against the SPL we cannot use the udev interfaces, which means non of the device special files are created. Because of this I had added a poor mans udev which cause the SPL to invoke an upcall and create the basic devices when a minor is registered. When a minor is unregistered we use the vnode interface to unlink the special file.
2009-02-04 23:15:41 +00:00
/* first_online_pgdat() is available */
#undef HAVE_FIRST_ONLINE_PGDAT
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* fls64() is available */
#undef HAVE_FLS64
Linux 2.6.36 compat, fs_struct->lock type change In the linux-2.6.36 kernel the fs_struct lock was changed from a rwlock_t to a spinlock_t. If the kernel would export the set_fs_pwd() symbol by default this would not have caused us any issues, but they don't. So we're forced to add a new autoconf check which sets the HAVE_FS_STRUCT_SPINLOCK define when a spinlock_t is used. We can then correctly use either spin_lock or write_lock in our custom set_fs_pwd() implementation.
2010-11-09 19:15:32 +00:00
/* struct fs_struct uses spinlock_t */
#undef HAVE_FS_STRUCT_SPINLOCK
Linux VM Integration Cleanup Remove all instances of functions being reimplemented in the SPL. When the prototypes are available in the linux headers but the function address itself is not exported use kallsyms_lookup_name() to find the address. The function name itself can them become a define which calls a function pointer. This is preferable to reimplementing the function in the SPL because it ensures we get the correct version of the function for the running kernel. This is actually pretty safe because the prototype is defined in the headers so we know we are calling the function properly. This patch also includes a rhel5 kernel patch we exports the needed symbols so we don't need to use kallsyms_lookup_name(). There are autoconf checks to detect if the symbol is exported and if so to use it directly. We should add patches for stock upstream kernels as needed if for no other reason than so we can easily track which additional symbols we needed exported. Those patches can also be used by anyone willing to rebuild their kernel, but this should not be a requirement. The rhel5 version of the export-symbols patch has been applied to the chaos kernel. Additional fixes: 1) Implement vmem_size() function using get_vmalloc_info() 2) SPL_CHECK_SYMBOL_EXPORT macro updated to use $LINUX_OBJ instead of $LINUX because Module.symvers is a build product. When $LINUX_OBJ != $LINUX we will not properly detect exported symbols. 3) SPL_LINUX_COMPILE_IFELSE macro updated to add include2 and $LINUX/include search paths to allow proper compilation when the kernel target build directory is not the source directory.
2009-02-25 21:20:40 +00:00
/* get_vmalloc_info() is available */
#undef HAVE_GET_VMALLOC_INFO
Additional Linux VM integration Added support for Solaris swapfs_minfree, and swapfs_reserve tunables. In additional availrmem is now available and return a reasonable value which is reasonably analogous to the Solaris meaning. On linux we return the sun of free and inactive pages since these are all easily reclaimable. All tunables are available in /proc/sys/kernel/spl/vm/* and they may need a little adjusting once we observe the real behavior. Some of the defaults are mapped to similar linux counterparts, others are straight from the OpenSolaris defaults.
2009-02-05 20:26:34 +00:00
/* get_zone_counts() is available */
#undef HAVE_GET_ZONE_COUNTS
SLES10 Fixes (part 2): - Configure check, the div64_64() function was renamed to div64_u64() as of 2.6.26. - Configure check, the global_page_state() fuction was introduced in 2.6.18 kernels. The earlier 2.6.16 based SLES10 must not try and use it, thankfully get_zone_counts() is still available. - To simplify debugging poison all symbols aquired dynamically using spl_kallsyms_lookup_name() with SYMBOL_POISON. - Add console messages when the user mode helpers fail. - spl_kmem_init_globals() use bit shifts instead of division. - When the monotonic clock is unavailable __gethrtime() must perform the HZ division as an 'unsigned long long' because the SPL only implements __udivdi3(), and not __divdi3() for 'long long' division on 32-bit arches.
2009-05-20 17:08:37 +00:00
/* global_page_state() is available */
#undef HAVE_GLOBAL_PAGE_STATE
Add basic credential support and splat tests. The previous credential implementation simply provided the needed types and a couple of dummy functions needed. This update correctly ties the basic Solaris credential API in to one of two Linux kernel APIs. Prior to 2.6.29 the linux kernel embeded all credentials in the task structure. For these kernels, we pass around the entire task struct as if it were the credential, then we use the helper functions to extract the credential related bits. As of 2.6.29 a new credential type was added which we can and do fairly cleanly layer on top of. Once again the helper functions nicely hide the implementation details from all callers. Three tests were added to the splat test framework to verify basic correctness. They should be extended as needed when need credential functions are added.
2009-07-28 00:18:59 +00:00
/* groups_search() is available */
#undef HAVE_GROUPS_SEARCH
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* init_utsname() is available */
#undef HAVE_INIT_UTSNAME
/* struct inode has i_mutex */
#undef HAVE_INODE_I_MUTEX
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
Linux compat 2.6.37, invalidate_inodes() In the 2.6.37 kernel the function invalidate_inodes() is no longer exported for use by modules. This memory management functionality is needed to invalidate the inodes attached to a super block without unmounting the filesystem. Because this function still exists in the kernel and the prototype is available is a common header all we strictly need is the symbol address. The address is obtained using spl_kallsyms_lookup_name() and assigned to the variable invalidate_inodes_fn. Then a #define is used to replace all instances of invalidate_inodes() with a call to the acquired address. All the complexity is hidden behind HAVE_INVALIDATE_INODES and invalidate_inodes() can be used as usual. Long term we should try to get this, or another, interface made available to modules again.
2011-02-23 20:25:45 +00:00
/* invalidate_inodes() is available */
#undef HAVE_INVALIDATE_INODES
Proxmox VE kernel compat, invalidate_inodes() 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 <behlendorf1@llnl.gov> Closes #58
2011-12-21 22:22:45 +00:00
/* invalidate_inodes_check() is available */
#undef HAVE_INVALIDATE_INODES_CHECK
Linux VM Integration Cleanup Remove all instances of functions being reimplemented in the SPL. When the prototypes are available in the linux headers but the function address itself is not exported use kallsyms_lookup_name() to find the address. The function name itself can them become a define which calls a function pointer. This is preferable to reimplementing the function in the SPL because it ensures we get the correct version of the function for the running kernel. This is actually pretty safe because the prototype is defined in the headers so we know we are calling the function properly. This patch also includes a rhel5 kernel patch we exports the needed symbols so we don't need to use kallsyms_lookup_name(). There are autoconf checks to detect if the symbol is exported and if so to use it directly. We should add patches for stock upstream kernels as needed if for no other reason than so we can easily track which additional symbols we needed exported. Those patches can also be used by anyone willing to rebuild their kernel, but this should not be a requirement. The rhel5 version of the export-symbols patch has been applied to the chaos kernel. Additional fixes: 1) Implement vmem_size() function using get_vmalloc_info() 2) SPL_CHECK_SYMBOL_EXPORT macro updated to use $LINUX_OBJ instead of $LINUX because Module.symvers is a build product. When $LINUX_OBJ != $LINUX we will not properly detect exported symbols. 3) SPL_LINUX_COMPILE_IFELSE macro updated to add include2 and $LINUX/include search paths to allow proper compilation when the kernel target build directory is not the source directory.
2009-02-25 21:20:40 +00:00
/* kallsyms_lookup_name() is available */
#undef HAVE_KALLSYMS_LOOKUP_NAME
Linux 2.6.39 compat, kern_path_parent() 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.
2011-04-20 19:25:59 +00:00
/* kern_path_parent() is available */
Linux 3.1 compat, kern_path_parent() 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 <behlendorf1@llnl.gov> Issue #52
2011-11-09 20:29:51 +00:00
#undef HAVE_KERN_PATH_PARENT_HEADER
/* kern_path_parent() is available */
#undef HAVE_KERN_PATH_PARENT_SYMBOL
Linux 2.6.39 compat, kern_path_parent() 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.
2011-04-20 19:25:59 +00:00
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* kmalloc_node() is available */
#undef HAVE_KMALLOC_NODE
Add kmem_asprintf(), strfree(), strdup(), and minor cleanup. This patch adds three missing Solaris functions: kmem_asprintf(), strfree(), and strdup(). They are all implemented as a thin layer which just calls their Linux counterparts. As part of this an autoconf check for kvasprintf was added because it does not appear in older kernels. If the kernel does not provide it then spl-generic implements it. Additionally the dead DEBUG_KMEM_UNIMPLEMENTED code was removed to clean things up and make the kmem.h a little more readable.
2010-06-11 21:48:18 +00:00
/* kvasprintf() is available */
#undef HAVE_KVASPRINTF
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* monotonic_clock() is available */
#undef HAVE_MONOTONIC_CLOCK
SLES10 Fixes (part 3): - Configure check for mutex_lock_nested(). This function was introduced as part of the mutex validator in 2.6.18, but if it's unavailable then it's safe to fallback to a plain mutex_lock().
2009-05-20 17:56:13 +00:00
/* mutex_lock_nested() is available */
#undef HAVE_MUTEX_LOCK_NESTED
Reimplement mutexs for Linux lock profiling/analysis For a generic explanation of why mutexs needed to be reimplemented to work with the kernel lock profiling see commits: e811949a57044d60d12953c5c3b808a79a7d36ef and d28db80fd0fd4fd63aec09037c44408e51a222d6 The specific changes made to the mutex implemetation are as follows. The Linux mutex structure is now directly embedded in the kmutex_t. This allows a kmutex_t to be directly case to a mutex struct and passed directly to the Linux primative. Just like with the rwlocks it is critical that these functions be implemented as '#defines to ensure the location information is preserved. The preprocessor can then do a direct replacement of the Solaris primative with the linux primative. Just as with the rwlocks we need to track the lock owner. Here things get a little more interesting because depending on your kernel version, and how you've built your kernel Linux may already do this for you. If your running a 2.6.29 or newer kernel on a SMP system the lock owner will be tracked. This was added to Linux to support adaptive mutexs, more on that shortly. Alternately, your kernel might track the lock owner if you've set CONFIG_DEBUG_MUTEXES in the kernel build. If neither of the above things is true for your kernel the kmutex_t type will include and track the lock owner to ensure correct behavior. This is all handled by a new autoconf check called SPL_AC_MUTEX_OWNER. Concerning adaptive mutexs these are a very recent development and they did not make it in to either the latest FC11 of SLES11 kernels. Ideally, I'd love to see this kernel change appear in one of these distros because it does help performance. From Linux kernel commit: 0d66bf6d3514b35eb6897629059443132992dbd7 "Testing with Ingo's test-mutex application... gave a 345% boost for VFS scalability on my testbox" However, if you don't want to backport this change yourself you can still simply export the task_curr() symbol. The kmutex_t implementation will use this symbol when it's available to provide it's own adaptive mutexs. Finally, DEBUG_MUTEX support was removed including the proc handlers. This was done because now that we are cleanly integrated with the kernel profiling all this information and much much more is available in debug kernel builds. This code was now redundant. Update mutexs validated on: - SLES10 (ppc64) - SLES11 (x86_64) - CHAOS4.2 (x86_64) - RHEL5.3 (x86_64) - RHEL6 (x86_64) - FC11 (x86_64)
2009-09-25 21:47:01 +00:00
/* struct mutex has owner */
#undef HAVE_MUTEX_OWNER
Linux 2.6.39 compat, mutex owner Prior to Linux 2.6.39 when CONFIG_DEBUG_MUTEXES was defined the kernel stored a thread_info pointer as the mutex owner. From this you could get the pointer of the current task_struct to compare with get_current(). As of Linux 2.6.39 this behavior has changed and now the mutex stores a pointer to the task_struct. This commit detects the type of pointer stored in the mutex and adjusts the mutex_owner() and mutex_owned() functions to perform the correct comparision.
2011-06-24 18:57:14 +00:00
/* struct mutex owner is a task_struct */
#undef HAVE_MUTEX_OWNER_TASK_STRUCT
Linux VM integration / device special files Support added to provide reasonable values for the global Solaris VM variables: minfree, desfree, lotsfree, needfree. These values are set to the sum of their per-zone linux counterparts which should be close enough for Solaris consumers. When a non-GPL app links against the SPL we cannot use the udev interfaces, which means non of the device special files are created. Because of this I had added a poor mans udev which cause the SPL to invoke an upcall and create the basic devices when a minor is registered. When a minor is unregistered we use the vnode interface to unlink the special file.
2009-02-04 23:15:41 +00:00
/* next_online_pgdat() is available */
#undef HAVE_NEXT_ONLINE_PGDAT
/* next_zone() is available */
#undef HAVE_NEXT_ZONE
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* struct path used in struct nameidata */
#undef HAVE_PATH_IN_NAMEIDATA
SLES10 Fixes (part 6) - Prior to 2.6.17 there were no *_pgdat helper functions in mm/mmzone.c. Instead for_each_zone() operated directly on pgdat_list which may or may not have been exported depending on how your kernel was compiled. Now new configure checks determine if you have the helpers or not, and if the needed symbols are exported. If they are not exported then they are dynamically aquired at runtime by kallsyms_lookup_name().
2009-05-20 21:23:13 +00:00
/* pgdat helpers are available */
#undef HAVE_PGDAT_HELPERS
/* pgdat_list is available */
#undef HAVE_PGDAT_LIST
Detect kernels that honor gfp flags passed to vmalloc() zfsonlinux/spl@2092cf68d89a51eb0d6193aeadabb579dfc4b4a0 used PF_MEMALLOC to workaround a bug in the Linux kernel where allocations did not honor the gfp flags passed to vmalloc(). Unfortunately, PF_MEMALLOC has the side effect of permitting allocations to allocate pages outside of ZONE_NORMAL. This has been observed to result in the depletion of ZONE_DMA32. A kernel patch is available in the Gentoo bug tracker for this issue. https://bugs.gentoo.org/show_bug.cgi?id=416685 This negates any benefit PF_MEMALLOC provides, so we introduce an autotools check to disable the use of PF_MEMALLOC on systems with patched kernels. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #126
2012-06-07 02:38:12 +00:00
/* pmd_alloc_with_mask exists */
#undef HAVE_PMD_ALLOC_WITH_MASK
Reimplement rwlocks for Linux lock profiling/analysis. It turns out that the previous rwlock implementation worked well but did not integrate properly with the upstream kernel lock profiling/ analysis tools. This is a major problem since it would be awfully nice to be able to use the automatic lock checker and profiler. The problem is that the upstream lock tools use the pre-processor to create a lock class for each uniquely named locked. Since the rwsem was embedded in a wrapper structure the name was always the same. The effect was that we only ended up with one lock class for the entire SPL which caused the lock dependency checker to flag nearly everything as a possible deadlock. The solution was to directly map a krwlock to a Linux rwsem using a typedef there by eliminating the wrapper structure. This was not done initially because the rwsem implementation is specific to the arch. To fully implement the Solaris krwlock API using only the provided rwsem API is not possible. It can only be done by directly accessing some of the internal data member of the rwsem structure. For example, the Linux API provides a different function for dropping a reader vs writer lock. Whereas the Solaris API uses the same function and the caller does not pass in what type of lock it is. This means to properly drop the lock we need to determine if the lock is currently a reader or writer lock. Then we need to call the proper Linux API function. Unfortunately, there is no provided API for this so we must extracted this information directly from arch specific lock implementation. This is all do able, and what I did, but it does complicate things considerably. The good news is that in addition to the profiling benefits of this change. We may see performance improvements due to slightly reduced overhead when creating rwlocks and manipulating them. The only function I was forced to sacrafice was rw_owner() because this information is simply not stored anywhere in the rwsem. Luckily this appears not to be a commonly used function on Solaris, and it is my understanding it is mainly used for debugging anyway. In addition to the core rwlock changes, extensive updates were made to the rwlock regression tests. Each class of test was extended to provide more API coverage and to be more rigerous in checking for misbehavior. This is a pretty significant change and with that in mind I have been careful to validate it on several platforms before committing. The full SPLAT regression test suite was run numberous times on all of the following platforms. This includes various kernels ranging from 2.6.16 to 2.6.29. - SLES10 (ppc64) - SLES11 (x86_64) - CHAOS4.2 (x86_64) - RHEL5.3 (x86_64) - RHEL6 (x86_64) - FC11 (x86_64)
2009-09-18 23:09:47 +00:00
/* __put_task_struct() is available */
#undef HAVE_PUT_TASK_STRUCT
Set cwd to '/' for the process executing insmod. Ricardo has pointed out that under Solaris the cwd is set to '/' during module load, while under Linux it is set to the callers cwd. To handle this cleanly I've reworked the module *_init()/_exit() macros so they call a *_setup()/_cleanup() function when any SPL dependent module is loaded or unloaded. This gives us a chance to perform any needed modification of the process, in this case changing the cwd. It also handily provides a way to avoid creating wrapper init()/exit() functions because the Solaris and Linux prototypes differ slightly. All dependent modules should now call the spl helper macros spl_module_{init,exit}() instead of the native linux versions. Unfortunately, it appears that under Linux there has been no consistent API in the kernel to set the cwd in a module. Because of this I have had to add more autoconf magic than I'd like. However, what I have done is correct and has been tested on RHEL5, SLES11, FC11, and CHAOS kernels. In addition, I have change the rootdir type from a 'void *' to the correct 'vnode_t *' type. And I've set rootdir to a non-NULL value.
2009-10-01 23:06:15 +00:00
/* set_fs_pwd() is available */
#undef HAVE_SET_FS_PWD
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* set_normalized_timespec() is available as export */
#undef HAVE_SET_NORMALIZED_TIMESPEC_EXPORT
/* set_normalized_timespec() is available as inline */
#undef HAVE_SET_NORMALIZED_TIMESPEC_INLINE
/* set_shrinker() available */
#undef HAVE_SET_SHRINKER
Linux 3.0: Shrinker compatibility 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.
2011-06-16 22:39:08 +00:00
/* struct shrink_control exists */
#undef HAVE_SHRINK_CONTROL_STRUCT
Add dnlc_reduce_cache() support Provide the dnlc_reduce_cache() function which attempts to prune cached entries from the dcache and icache. After the entries are pruned any slabs which they may have been using are reaped. Note the API takes a reclaim percentage but we don't have easy access to the total number of cache entries to calculate the reclaim count. However, in practice this doesn't need to be exactly correct. We simply need to reclaim some useful fraction (but not all) of the cache. The caller can determine if more needs to be done.
2011-03-31 00:44:35 +00:00
/* shrink_dcache_memory() is available */
#undef HAVE_SHRINK_DCACHE_MEMORY
/* shrink_icache_memory() is available */
#undef HAVE_SHRINK_ICACHE_MEMORY
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* 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
When checking for symbol exports, try compiling. This patch adds a new autoconf function: SPL_LINUX_TRY_COMPILE_SYMBOL. This new function does the following: - Call LINUX_TRY_COMPILE with the specified parameters. - If unsuccessful, return false. - If successful and we're configuring with --enable-linux-builtin, return true. - Else, call CHECK_SYMBOL_EXPORT with the specified parameters and return the result. All calls to CHECK_SYMBOL_EXPORT are converted to LINUX_TRY_COMPILE_SYMBOL so that the tests work even when configuring for builtin on a kernel which doesn't have loadable module support, or hasn't been built yet. The only exception are: - AC_GET_VMALLOC_INFO, because we don't even have a public header to include in the test case, but that's okay considering this symbol can be ignored just fine. - SPL_AC_DEVICE_CREATE, which is legacy API for 2.6.18 kernels. Since kernels this old are no longer supported it should arguably just be removed entirely from the build system. Note that we're also checking for the correct prototype with an actual call, which was not the case with CHECK_SYMBOL_EXPORT. However, for "complicated" test cases like with multiple symbol versions (e.g. vfs_fsync), we stick with the original behavior and only check for the function's existence. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue zfsonlinux/zfs#851
2012-07-16 15:04:05 +00:00
/* task_curr() is available */
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
#undef HAVE_TASK_CURR
/* timespec_sub() is available */
#undef HAVE_TIMESPEC_SUB
/* linux/uaccess.h exists */
#undef HAVE_UACCESS_HEADER
/* kernel defines uintptr_t */
#undef HAVE_UINTPTR_T
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
Add configure check for user_path_dir() I didn't notice at the time but user_path_dir() was not introduced at the same time as set_fs_pwd() change. I had lumped the two together but in fact user_path_dir() was introduced in 2.6.27 and set_fs_pwd() taking 2 args was introduced in 2.6.25. This means builds against 2.6.25-2.6.26 kernels were broken. To fix this I've added a check for user_path_dir() and no longer assume that if set_fs_pwd() takes 2 args then user_path_dir() is also available.
2010-07-01 20:37:43 +00:00
/* user_path_dir() is available */
#undef HAVE_USER_PATH_DIR
Linux 3.1 compat, vfs_fsync() 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 <behlendorf1@llnl.gov> Issue #52
2011-11-09 20:45:35 +00:00
/* vfs_fsync() is available */
#undef HAVE_VFS_FSYNC
Update global_page_state() support for 2.6.29 kernels. Basically everything we need to monitor the global memory state of the system is now cleanly available via global_page_state(). The problem is that this interface is still fairly recent, and there has been one change in the page state enum which we need to handle. These changes basically boil down to the following: - If global_page_state() is available we should use it. Several autoconf checks have been added to detect the correct enum names. - If global_page_state() is not available check to see if get_zone_counts() symbol is available and use that. - If the get_zone_counts() symbol is not exported we have no choice be to dynamically aquire it at load time. This is an absolute last resort for old kernel which we don't want to patch to cleanly export the symbol.
2009-07-28 22:06:42 +00:00
/* Page state NR_ACTIVE is available */
#undef HAVE_ZONE_STAT_ITEM_NR_ACTIVE
/* Page state NR_ACTIVE_ANON is available */
#undef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON
/* Page state NR_ACTIVE_FILE is available */
#undef HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE
/* Page state NR_FREE_PAGES is available */
#undef HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES
/* Page state NR_INACTIVE is available */
#undef HAVE_ZONE_STAT_ITEM_NR_INACTIVE
/* Page state NR_INACTIVE_ANON is available */
#undef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON
/* Page state NR_INACTIVE_FILE is available */
#undef HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE
Add support for 'make -s' silent builds The cleanest way to do this is to set AM_LIBTOOLFLAGS = --silent. However, AM_LIBTOOLFLAGS is not honored by automake-1.9.6-2.1 which is what I have been using. To cleanly handle this I am updating to automake-1.11-3 which is why it looks like there is a lot of churn in the Makefiles.
2010-03-26 22:21:06 +00:00
/* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#undef LT_OBJDIR
Update global_page_state() support for 2.6.29 kernels. Basically everything we need to monitor the global memory state of the system is now cleanly available via global_page_state(). The problem is that this interface is still fairly recent, and there has been one change in the page state enum which we need to handle. These changes basically boil down to the following: - If global_page_state() is available we should use it. Several autoconf checks have been added to detect the correct enum names. - If global_page_state() is not available check to see if get_zone_counts() symbol is available and use that. - If the get_zone_counts() symbol is not exported we have no choice be to dynamically aquire it at load time. This is an absolute last resort for old kernel which we don't want to patch to cleanly export the symbol.
2009-07-28 22:06:42 +00:00
/* get_zone_counts() is needed */
#undef NEED_GET_ZONE_COUNTS
FC10/i686 Compatibility Update (2.6.27.19-170.2.35.fc10.i686) In the interests of portability I have added a FC10/i686 box to my list of development platforms. The hope is this will allow me to keep current with upstream kernel API changes, and at the same time ensure I don't accidentally break x86 support. This patch resolves all remaining issues observed under that environment. 1) SPL_AC_ZONE_STAT_ITEM_FIA autoconf check added. As of 2.6.21 the kernel added a clean API for modules to get the global count for free, inactive, and active pages. The SPL attempts to detect if this API is available and directly map spl_global_page_state() to global_page_state(). If the full API is not available then spl_global_page_state() is implemented as a thin layer to get these values via get_zone_counts() if that symbol is available. 2) New kmem:vmem_size regression test added to validate correct vmem_size() functionality. The test case acquires the current global vmem state, allocates from the vmem region, then verifies the allocation is correctly reflected in the vmem_size() stats. 3) Change splat_kmem_cache_thread_test() to always use KMC_KMEM based memory. On x86 systems with limited virtual address space failures resulted due to exhaustig the address space. The tests really need to problem exhausting all memory on the system thus we need to use the physical address space. 4) Change kmem:slab_lock to cap it's memory usage at availrmem instead of using the native linux nr_free_pages(). This provides additional test coverage of the SPL Linux VM integration. 5) Change kmem:slab_overcommit to perform allocation of 256K instead of 1M. On x86 based systems it is not possible to create a kmem backed slab with entires of that size. To compensate for this the number of allocations performed in increased by 4x. 6) Additional autoconf documentation for proposed upstream API changes to make additional symbols available to modules. 7) Console error messages added when spl_kallsyms_lookup_name() fails to locate an expected symbol. This causes the module to fail to load and we need to know exactly which symbol was not available.
2009-03-17 19:16:31 +00:00
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* 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
Correctly handle rwsem_is_locked() behavior A race condition in rwsem_is_locked() was fixed in Linux 2.6.33 and the fix was backported to RHEL5 as of kernel 2.6.18-190.el5. Details can be found here: https://bugzilla.redhat.com/show_bug.cgi?id=526092 The race condition was fixed in the kernel by acquiring the semaphore's wait_lock inside rwsem_is_locked(). The SPL worked around the race condition by acquiring the wait_lock before calling that function, but with the fix in place it must not do that. This commit implements an autoconf test to detect whether the fixed version of rwsem_is_locked() is present. The previous version of rwsem_is_locked() was an inline static function while the new version is exported as a symbol which we can check for in module.symvers. Depending on the result we correctly implement the needed compatibility macros for proper spinlock handling. Finally, we do the right thing with spin locks in RW_*_HELD() by using the new compatibility macros. We only only acquire the semaphore's wait_lock if it is calling a rwsem_is_locked() that does not itself try to acquire the lock. Some new overhead and a small harmless race is introduced by this change. This is because RW_READ_HELD() and RW_WRITE_HELD() now acquire and release the wait_lock twice: once for the call to rwsem_is_locked() and once for the call to rw_owner(). This can't be avoided if calling a rwsem_is_locked() that takes the wait_lock, as it will in more recent kernels. The other case which only occurs in legacy kernels could be optimized by taking the lock only once, as was done prior to this commit. However, I decided that the performance gain probably wasn't significant enough to justify the messy special cases required. The function spl_rw_get_owner() was only used to enable the afore-mentioned optimization. Since it is no longer used, I removed it. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-10 18:01:46 +00:00
/* rwsem_is_locked() acquires sem->wait_lock */
#undef RWSEM_IS_LOCKED_TAKES_WAIT_LOCK
Linux 3.2 compat: rw_semaphore.wait_lock is raw 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 <behlendorf1@llnl.gov> Closes: #76 Closes: zfsonlinux/zfs#463
2012-01-11 17:44:34 +00:00
/* struct rw_semaphore member wait_lock is raw_spinlock_t */
#undef RWSEM_SPINLOCK_IS_RAW
Prefix META_ALIAS with SPL_
2008-11-26 21:26:05 +00:00
/* Define the project alias string. */
#undef SPL_META_ALIAS
Prefix all META_* #defines with SPL to prevent colisions which include our spl_config.h. Dependent packages may do this to leverage the autoconf check we have already run aganst the kernel.
2008-11-26 21:09:37 +00:00
/* Define the project author. */
#undef SPL_META_AUTHOR
/* Define the project release date. */
#undef SPL_META_DATA
/* Define the libtool library 'age' version information. */
#undef SPL_META_LT_AGE
/* Define the libtool library 'current' version information. */
#undef SPL_META_LT_CURRENT
/* Define the libtool library 'revision' version information. */
#undef SPL_META_LT_REVISION
/* Define the project name. */
#undef SPL_META_NAME
/* Define the project release. */
#undef SPL_META_RELEASE
/* Define the project version. */
#undef SPL_META_VERSION
* : Add autogen.sh products. * configure.ac : Use AC_CONFIG_AUX_DIR to put autoconf products in ./auotconf. * autogen.sh : Use --copy to avoid symlinks, remove error redirection, run aclocal before libtoolize. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@180 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-11-24 23:49:18 +00:00
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Version number of package */
#undef VERSION