diff options
| author | Brian Behlendorf <[email protected]> | 2013-01-08 09:42:49 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2013-01-08 09:53:13 -0800 |
| commit | 1c7b3eaf87492e875d7ad05f183e98fa306e48c2 (patch) | |
| tree | 363ffca3d6ce6c1ca4e09d44fd60d04cdc22667c /config/spl-build.m4 | |
| parent | 46a75aadb7c08085a4ad2e55dcf5b6fb387c1253 (diff) | |
RHEL 6.4 compat, fallocate()
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]>
Diffstat (limited to 'config/spl-build.m4')
| -rw-r--r-- | config/spl-build.m4 | 74 |
1 files changed, 72 insertions, 2 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index ea25e206f..f710d8e95 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -78,6 +78,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [ SPL_AC_EXPORTED_RWSEM_IS_LOCKED SPL_AC_KERNEL_INVALIDATE_INODES SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES + SPL_AC_KERNEL_FALLOCATE SPL_AC_SHRINK_DCACHE_MEMORY SPL_AC_SHRINK_ICACHE_MEMORY SPL_AC_KERN_PATH_PARENT_HEADER @@ -1922,7 +1923,6 @@ AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [ dnl # dnl # 3.5 API change, dnl # inode_operations.truncate_range removed -dnl # (deprecated in favor of FALLOC_FL_PUNCH_HOLE) dnl # AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [ AC_MSG_CHECKING([whether truncate_range() inode operation is available]) @@ -1938,7 +1938,77 @@ AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [ ],[ AC_MSG_RESULT(no) ]) -])) +]) + +dnl # +dnl # Linux 2.6.38 - 3.x API +dnl # +AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [ + AC_MSG_CHECKING([whether fops->fallocate() exists]) + SPL_LINUX_TRY_COMPILE([ + #include <linux/fs.h> + ],[ + long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL; + struct file_operations fops __attribute__ ((unused)) = { + .fallocate = fallocate, + }; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists]) + ],[ + AC_MSG_RESULT(no) + ]) +]) + +dnl # +dnl # Linux 2.6.x - 2.6.37 API +dnl # +AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [ + AC_MSG_CHECKING([whether iops->fallocate() exists]) + SPL_LINUX_TRY_COMPILE([ + #include <linux/fs.h> + ],[ + long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL; + struct inode_operations fops __attribute__ ((unused)) = { + .fallocate = fallocate, + }; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists]) + ],[ + AC_MSG_RESULT(no) + ]) +]) + +dnl # +dnl # PaX Linux 2.6.38 - 3.x API +dnl # +AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [ + AC_MSG_CHECKING([whether fops->fallocate() exists]) + SPL_LINUX_TRY_COMPILE([ + #include <linux/fs.h> + ],[ + long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL; + struct file_operations_no_const fops __attribute__ ((unused)) = { + .fallocate = fallocate, + }; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists]) + ],[ + AC_MSG_RESULT(no) + ]) +]) + +dnl # +dnl # The fallocate callback was moved from the inode_operations +dnl # structure to the file_operations structure. +dnl # +AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [ + SPL_AC_KERNEL_FILE_FALLOCATE + SPL_AC_KERNEL_INODE_FALLOCATE + SPL_AC_PAX_KERNEL_FILE_FALLOCATE +]) dnl # dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5. |