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[Qemu-devel] [PATCH] raw-posix: Support discard on more filesystems
From: |
Kusanagi Kouichi |
Subject: |
[Qemu-devel] [PATCH] raw-posix: Support discard on more filesystems |
Date: |
Sat, 5 Jan 2013 21:05:10 +0900 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Linux 2.6.38 introduced the filesystem independent interface to
deallocate part of a file. As of Linux 3.7, btrfs, ext4, ocfs2,
tmpfs and xfs support it.
Signed-off-by: Kusanagi Kouichi <address@hidden>
---
block/raw-posix.c | 22 ++++++++++++++++++++--
configure | 19 +++++++++++++++++++
2 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 87d888e..66ba0b5 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -59,6 +59,9 @@
#ifdef CONFIG_FIEMAP
#include <linux/fiemap.h>
#endif
+#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
+#include <linux/falloc.h>
+#endif
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/disk.h>
#include <sys/cdio.h>
@@ -1098,15 +1101,30 @@ static int xfs_discard(BDRVRawState *s, int64_t
sector_num, int nb_sectors)
static coroutine_fn int raw_co_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors)
{
-#ifdef CONFIG_XFS
+#if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_XFS)
BDRVRawState *s = bs->opaque;
+#endif
+ int ret = 0;
+#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
+ do {
+ if (fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+ sector_num << BDRV_SECTOR_BITS,
+ nb_sectors << BDRV_SECTOR_BITS) == 0) {
+ return 0;
+ }
+ } while (errno == EINTR);
+
+ ret = -errno;
+#endif
+
+#ifdef CONFIG_XFS
if (s->is_xfs) {
return xfs_discard(s, sector_num, nb_sectors);
}
#endif
- return 0;
+ return ret;
}
static QEMUOptionParameter raw_create_options[] = {
diff --git a/configure b/configure
index 837a84a..ff2e373 100755
--- a/configure
+++ b/configure
@@ -2576,6 +2576,22 @@ if compile_prog "" "" ; then
fallocate=yes
fi
+# check for fallocate hole punching
+fallocate_punch_hole=no
+cat > $TMPC << EOF
+#include <fcntl.h>
+#include <linux/falloc.h>
+
+int main(void)
+{
+ fallocate(0, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 0);
+ return 0;
+}
+EOF
+if compile_prog "" "" ; then
+ fallocate_punch_hole=yes
+fi
+
# check for sync_file_range
sync_file_range=no
cat > $TMPC << EOF
@@ -3485,6 +3501,9 @@ fi
if test "$fallocate" = "yes" ; then
echo "CONFIG_FALLOCATE=y" >> $config_host_mak
fi
+if test "$fallocate_punch_hole" = "yes" ; then
+ echo "CONFIG_FALLOCATE_PUNCH_HOLE=y" >> $config_host_mak
+fi
if test "$sync_file_range" = "yes" ; then
echo "CONFIG_SYNC_FILE_RANGE=y" >> $config_host_mak
fi
--
1.7.10.4
- [Qemu-devel] [PATCH] raw-posix: Support discard on more filesystems,
Kusanagi Kouichi <=