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Support the fallocate() file operation.

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Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is
supported, since it's the only one that matches the behavior of
zfs_space(). This makes it pretty much useless in its current
form, but it's a start.

To support other flag combinations we would need to modify
zfs_space() to make it more flexible, or emulate the desired
functionality in zpl_fallocate().

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #334
This commit is contained in:
Etienne Dechamps
2011-09-02 09:42:07 +02:00
committed by Brian Behlendorf
parent aec69371a6
commit cb2d19010d
61 changed files with 447 additions and 0 deletions
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config/kernel-fallocate.m4
+48
View File
@@ -0,0 +1,48 @@
dnl #
dnl # Linux 2.6.38 - 3.x API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FILE_FALLOCATE], [
AC_MSG_CHECKING([whether fops->fallocate() exists])
ZFS_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([ZFS_AC_KERNEL_INODE_FALLOCATE], [
AC_MSG_CHECKING([whether iops->fallocate() exists])
ZFS_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 # The fallocate callback was moved from the inode_operations
dnl # structure to the file_operations structure.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FALLOCATE], [
ZFS_AC_KERNEL_FILE_FALLOCATE
ZFS_AC_KERNEL_INODE_FALLOCATE
])
config/kernel.m4
+1
View File
@@ -43,6 +43,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_EVICT_INODE
ZFS_AC_KERNEL_NR_CACHED_OBJECTS
ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
ZFS_AC_KERNEL_FALLOCATE
ZFS_AC_KERNEL_INSERT_INODE_LOCKED
ZFS_AC_KERNEL_D_OBTAIN_ALIAS
ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE