Support the fallocate() file operation.

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
openzfs · Feb 10, 2012 · cb2d190 · cb2d190
1 parent aec6937
commit cb2d190
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diff --git a/Makefile.in b/Makefile.in
@@ -86,6 +86,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/Makefile.in b/cmd/Makefile.in
@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/mount_zfs/Makefile.in b/cmd/mount_zfs/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/sas_switch_id/Makefile.in b/cmd/sas_switch_id/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zdb/Makefile.in b/cmd/zdb/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zfs/Makefile.in b/cmd/zfs/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zinject/Makefile.in b/cmd/zinject/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zpios/Makefile.in b/cmd/zpios/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zpool/Makefile.in b/cmd/zpool/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zpool_id/Makefile.in b/cmd/zpool_id/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zpool_layout/Makefile.in b/cmd/zpool_layout/Makefile.in
@@ -65,6 +65,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/ztest/Makefile.in b/cmd/ztest/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/cmd/zvol_id/Makefile.in b/cmd/zvol_id/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-check-disk-size-change.m4 \
 	$(top_srcdir)/config/kernel-d-obtain-alias.m4 \
 	$(top_srcdir)/config/kernel-evict-inode.m4 \
+	$(top_srcdir)/config/kernel-fallocate.m4 \
 	$(top_srcdir)/config/kernel-fmode-t.m4 \
 	$(top_srcdir)/config/kernel-fsync.m4 \
 	$(top_srcdir)/config/kernel-get-disk-ro.m4 \

diff --git a/config/kernel-fallocate.m4 b/config/kernel-fallocate.m4
@@ -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
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
@@ -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