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authorRam Pai <linuxram@us.ibm.com>2005-11-07 17:19:33 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 18:18:10 -0800
commit03e06e68ff76294e53ffa898cb844d2a997b043e (patch)
treedf17444b2c9b89e1eed75e09d46ea36c40ebd1df /include
parent07b20889e3052c7e77d6a6a54e7e83446eb1ba84 (diff)
[PATCH] introduce shared mounts
This creates shared mounts. A shared mount when bind-mounted to some mountpoint, propagates mount/umount events to each other. All the shared mounts that propagate events to each other belong to the same peer-group. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h1
-rw-r--r--include/linux/mount.h2
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6c431086abb..551fba303cf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -105,6 +105,7 @@ extern int dir_notify_enable;
#define MS_REC 16384
#define MS_VERBOSE 32768
#define MS_PRIVATE (1<<18) /* change to private */
+#define MS_SHARED (1<<20) /* change to shared */
#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 8eadd3b6589..2582559718f 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -20,6 +20,7 @@
#define MNT_NOSUID 0x01
#define MNT_NODEV 0x02
#define MNT_NOEXEC 0x04
+#define MNT_SHARED 0x10 /* if the vfsmount is a shared mount */
#define MNT_PNODE_MASK 0x30 /* propogation flag mask */
struct vfsmount {
@@ -36,6 +37,7 @@ struct vfsmount {
char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
struct list_head mnt_list;
struct list_head mnt_expire; /* link in fs-specific expiry list */
+ struct list_head mnt_share; /* circular list of shared mounts */
struct namespace *mnt_namespace; /* containing namespace */
int mnt_pinned;
};