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[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>
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@ -68,6 +68,7 @@ struct vfsmount *alloc_vfsmnt(const char *name)
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INIT_LIST_HEAD(&mnt->mnt_mounts);
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INIT_LIST_HEAD(&mnt->mnt_list);
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INIT_LIST_HEAD(&mnt->mnt_expire);
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INIT_LIST_HEAD(&mnt->mnt_share);
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if (name) {
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int size = strlen(name) + 1;
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char *newname = kmalloc(size, GFP_KERNEL);
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@ -1113,7 +1114,7 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
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data_page);
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else if (flags & MS_BIND)
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retval = do_loopback(&nd, dev_name, flags & MS_REC);
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else if (flags & MS_PRIVATE)
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else if (flags & (MS_SHARED | MS_PRIVATE))
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retval = do_change_type(&nd, flags);
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else if (flags & MS_MOVE)
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retval = do_move_mount(&nd, dev_name);
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11
fs/pnode.c
11
fs/pnode.c
@ -11,7 +11,18 @@
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#include <linux/fs.h>
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#include "pnode.h"
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/* return the next shared peer mount of @p */
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static inline struct vfsmount *next_peer(struct vfsmount *p)
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{
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return list_entry(p->mnt_share.next, struct vfsmount, mnt_share);
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}
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void change_mnt_propagation(struct vfsmount *mnt, int type)
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{
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if (type == MS_SHARED) {
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mnt->mnt_flags |= MNT_SHARED;
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} else {
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list_del_init(&mnt->mnt_share);
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mnt->mnt_flags &= ~MNT_PNODE_MASK;
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}
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}
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@ -10,5 +10,9 @@
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#include <linux/list.h>
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#include <linux/mount.h>
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#define IS_MNT_SHARED(mnt) (mnt->mnt_flags & MNT_SHARED)
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#define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~MNT_SHARED)
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void change_mnt_propagation(struct vfsmount *, int);
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#endif /* _LINUX_PNODE_H */
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@ -105,6 +105,7 @@ extern int dir_notify_enable;
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#define MS_REC 16384
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#define MS_VERBOSE 32768
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#define MS_PRIVATE (1<<18) /* change to private */
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#define MS_SHARED (1<<20) /* change to shared */
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#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
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#define MS_ACTIVE (1<<30)
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#define MS_NOUSER (1<<31)
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@ -20,6 +20,7 @@
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#define MNT_NOSUID 0x01
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#define MNT_NODEV 0x02
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#define MNT_NOEXEC 0x04
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#define MNT_SHARED 0x10 /* if the vfsmount is a shared mount */
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#define MNT_PNODE_MASK 0x30 /* propogation flag mask */
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struct vfsmount {
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@ -36,6 +37,7 @@ struct vfsmount {
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char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
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struct list_head mnt_list;
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struct list_head mnt_expire; /* link in fs-specific expiry list */
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struct list_head mnt_share; /* circular list of shared mounts */
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struct namespace *mnt_namespace; /* containing namespace */
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int mnt_pinned;
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};
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