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authorSage Weil <sage@newdream.net>2010-10-29 23:41:32 +0400
committerChris Mason <chris.mason@oracle.com>2010-10-30 05:41:57 +0400
commit72fd032e94240d001b1d22f2c1dfd2592b02e44e (patch)
tree7671ea5585f79a8cecc9708e869aa37e24eb74de /fs/btrfs/ioctl.h
parent462045928bda777c86919a396a42991fcf235378 (diff)
downloadlinux-72fd032e94240d001b1d22f2c1dfd2592b02e44e.tar.xz
Btrfs: add SNAP_CREATE_ASYNC ioctl
Create a snap without waiting for it to commit to disk. The ioctl is ordered such that subsequent operations will not be contained by the created snapshot, and the commit is initiated, but the ioctl does not wait for the snapshot to commit to disk. We return the specific transid to userspace so that an application can wait for this specific snapshot creation to commit via the WAIT_SYNC ioctl. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ioctl.h')
-rw-r--r--fs/btrfs/ioctl.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 16e1442523b7..17c99ebdf960 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -22,14 +22,21 @@
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_VOL_NAME_MAX 255
-#define BTRFS_PATH_NAME_MAX 4087
/* this should be 4k */
+#define BTRFS_PATH_NAME_MAX 4087
struct btrfs_ioctl_vol_args {
__s64 fd;
char name[BTRFS_PATH_NAME_MAX + 1];
};
+#define BTRFS_SNAPSHOT_NAME_MAX 4079
+struct btrfs_ioctl_async_vol_args {
+ __s64 fd;
+ __u64 transid;
+ char name[BTRFS_SNAPSHOT_NAME_MAX + 1];
+};
+
#define BTRFS_INO_LOOKUP_PATH_MAX 4080
struct btrfs_ioctl_ino_lookup_args {
__u64 treeid;
@@ -180,4 +187,6 @@ struct btrfs_ioctl_space_args {
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64)
#define BTRFS_IOC_WAIT_SYNC _IOW(BTRFS_IOCTL_MAGIC, 22, __u64)
+#define BTRFS_IOC_SNAP_CREATE_ASYNC _IOW(BTRFS_IOCTL_MAGIC, 23, \
+ struct btrfs_ioctl_async_vol_args)
#endif