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authorTakashi Sato <t-sato@yk.jp.nec.com>2009-01-09 19:40:59 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-09 19:54:42 -0500
commitfcccf502540e3d752d33b2d8e976034dee81f9f7 (patch)
tree401be4ad2fc3c535a2fc77e413b1be4a736f320c /include/linux/fs.h
parentc4be0c1dc4cdc37b175579be1460f15ac6495e9a (diff)
filesystem freeze: implement generic freeze feature
The ioctls for the generic freeze feature are below. o Freeze the filesystem int ioctl(int fd, int FIFREEZE, arg) fd: The file descriptor of the mountpoint FIFREEZE: request code for the freeze arg: Ignored Return value: 0 if the operation succeeds. Otherwise, -1 o Unfreeze the filesystem int ioctl(int fd, int FITHAW, arg) fd: The file descriptor of the mountpoint FITHAW: request code for unfreeze arg: Ignored Return value: 0 if the operation succeeds. Otherwise, -1 Error number: If the filesystem has already been unfrozen, errno is set to EINVAL. [akpm@linux-foundation.org: fix CONFIG_BLOCK=n] Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com> Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@ys.jp.nec.com> Cc: <xfs-masters@oss.sgi.com> Cc: <linux-ext4@vger.kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Alasdair G Kergon <agk@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3e59182de9df..6022f44043f2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -234,6 +234,8 @@ struct inodes_stat_t {
234#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 234#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
235#define FIBMAP _IO(0x00,1) /* bmap access */ 235#define FIBMAP _IO(0x00,1) /* bmap access */
236#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 236#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
237#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
238#define FITHAW _IOWR('X', 120, int) /* Thaw */
237 239
238#define FS_IOC_GETFLAGS _IOR('f', 1, long) 240#define FS_IOC_GETFLAGS _IOR('f', 1, long)
239#define FS_IOC_SETFLAGS _IOW('f', 2, long) 241#define FS_IOC_SETFLAGS _IOW('f', 2, long)
@@ -591,6 +593,11 @@ struct block_device {
591 * care to not mess up bd_private for that case. 593 * care to not mess up bd_private for that case.
592 */ 594 */
593 unsigned long bd_private; 595 unsigned long bd_private;
596
597 /* The counter of freeze processes */
598 int bd_fsfreeze_count;
599 /* Mutex for freeze */
600 struct mutex bd_fsfreeze_mutex;
594}; 601};
595 602
596/* 603/*