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vfs: take mnt_share/mnt_slave/mnt_slave_list and mnt_expire to struct mount

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-25 00:22:05 -05:00
parent 32301920f4
commit 6776db3d32
4 changed files with 41 additions and 40 deletions
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6
fs/mount.h
View File

@ -19,7 +19,11 @@ struct mount {
#endif
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
/* yet to be moved - up to mnt_slave */
/* yet to be moved - up to mnt_list */
struct list_head mnt_expire; /* link in fs-specific expiry list */
struct list_head mnt_share; /* circular list of shared mounts */
struct list_head mnt_slave_list;/* list of slave mounts */
struct list_head mnt_slave; /* slave list entry */
struct mount *mnt_master; /* slave is on master->mnt_slave_list */
};

41
fs/namespace.c
View File

@ -203,10 +203,10 @@ static struct mount *alloc_vfsmnt(const char *name)
INIT_LIST_HEAD(&p->mnt_child);
INIT_LIST_HEAD(&p->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list);
INIT_LIST_HEAD(&mnt->mnt_expire);
INIT_LIST_HEAD(&mnt->mnt_share);
INIT_LIST_HEAD(&mnt->mnt_slave_list);
INIT_LIST_HEAD(&mnt->mnt_slave);
INIT_LIST_HEAD(&p->mnt_expire);
INIT_LIST_HEAD(&p->mnt_share);
INIT_LIST_HEAD(&p->mnt_slave_list);
INIT_LIST_HEAD(&p->mnt_slave);
#ifdef CONFIG_FSNOTIFY
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
@ -714,14 +714,14 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
mnt->mnt_parent = mnt;
if (flag & CL_SLAVE) {
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave_list);
list_add(&mnt->mnt_slave, &old->mnt_slave_list);
mnt->mnt_master = old;
CLEAR_MNT_SHARED(&mnt->mnt);
} else if (!(flag & CL_PRIVATE)) {
if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(&old->mnt))
list_add(&mnt->mnt.mnt_share, &old->mnt.mnt_share);
list_add(&mnt->mnt_share, &old->mnt_share);
if (IS_MNT_SLAVE(old))
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave);
list_add(&mnt->mnt_slave, &old->mnt_slave);
mnt->mnt_master = old->mnt_master;
}
if (flag & CL_MAKE_SHARED)
@ -730,8 +730,8 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
/* stick the duplicate mount on the same expiry list
* as the original if that was on one */
if (flag & CL_EXPIRE) {
if (!list_empty(&old->mnt.mnt_expire))
list_add(&mnt->mnt.mnt_expire, &old->mnt.mnt_expire);
if (!list_empty(&old->mnt_expire))
list_add(&mnt->mnt_expire, &old->mnt_expire);
}
}
return mnt;
@ -1233,7 +1233,7 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
propagate_umount(&tmp_list);
list_for_each_entry(p, &tmp_list, mnt_hash) {
list_del_init(&p->mnt.mnt_expire);
list_del_init(&p->mnt_expire);
list_del_init(&p->mnt.mnt_list);
__touch_mnt_namespace(p->mnt.mnt_ns);
p->mnt.mnt_ns = NULL;
@ -1921,7 +1921,7 @@ static int do_move_mount(struct path *path, char *old_name)
/* if the mount is moved, it should no longer be expire
* automatically */
list_del_init(&old_path.mnt->mnt_expire);
list_del_init(&old->mnt_expire);
out1:
unlock_mount(path);
out:
@ -2033,11 +2033,12 @@ static int do_new_mount(struct path *path, char *type, int flags,
int finish_automount(struct vfsmount *m, struct path *path)
{
struct mount *mnt = real_mount(m);
int err;
/* The new mount record should have at least 2 refs to prevent it being
* expired before we get a chance to add it
*/
BUG_ON(mnt_get_count(real_mount(m)) < 2);
BUG_ON(mnt_get_count(mnt) < 2);
if (m->mnt_sb == path->mnt->mnt_sb &&
m->mnt_root == path->dentry) {
@ -2050,10 +2051,10 @@ int finish_automount(struct vfsmount *m, struct path *path)
return 0;
fail:
/* remove m from any expiration list it may be on */
if (!list_empty(&m->mnt_expire)) {
if (!list_empty(&mnt->mnt_expire)) {
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
list_del_init(&m->mnt_expire);
list_del_init(&mnt->mnt_expire);
br_write_unlock(vfsmount_lock);
up_write(&namespace_sem);
}
@ -2072,7 +2073,7 @@ void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list)
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
list_add_tail(&mnt->mnt_expire, expiry_list);
list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list);
br_write_unlock(vfsmount_lock);
up_write(&namespace_sem);
@ -2102,14 +2103,14 @@ void mark_mounts_for_expiry(struct list_head *mounts)
* - still marked for expiry (marked on the last call here; marks are
* cleared by mntput())
*/
list_for_each_entry_safe(mnt, next, mounts, mnt.mnt_expire) {
list_for_each_entry_safe(mnt, next, mounts, mnt_expire) {
if (!xchg(&mnt->mnt.mnt_expiry_mark, 1) ||
propagate_mount_busy(mnt, 1))
continue;
list_move(&mnt->mnt.mnt_expire, &graveyard);
list_move(&mnt->mnt_expire, &graveyard);
}
while (!list_empty(&graveyard)) {
mnt = list_first_entry(&graveyard, struct mount, mnt.mnt_expire);
mnt = list_first_entry(&graveyard, struct mount, mnt_expire);
touch_mnt_namespace(mnt->mnt.mnt_ns);
umount_tree(mnt, 1, &umounts);
}
@ -2152,7 +2153,7 @@ static int select_submounts(struct mount *parent, struct list_head *graveyard)
}
if (!propagate_mount_busy(mnt, 1)) {
list_move_tail(&mnt->mnt.mnt_expire, graveyard);
list_move_tail(&mnt->mnt_expire, graveyard);
found++;
}
}
@ -2182,7 +2183,7 @@ static void shrink_submounts(struct mount *mnt, struct list_head *umounts)
while (select_submounts(mnt, &graveyard)) {
while (!list_empty(&graveyard)) {
m = list_first_entry(&graveyard, struct mount,
mnt.mnt_expire);
mnt_expire);
touch_mnt_namespace(m->mnt.mnt_ns);
umount_tree(m, 1, umounts);
}

30
fs/pnode.c
View File

@ -15,17 +15,17 @@
/* return the next shared peer mount of @p */
static inline struct mount *next_peer(struct mount *p)
{
return list_entry(p->mnt.mnt_share.next, struct mount, mnt.mnt_share);
return list_entry(p->mnt_share.next, struct mount, mnt_share);
}
static inline struct mount *first_slave(struct mount *p)
{
return list_entry(p->mnt.mnt_slave_list.next, struct mount, mnt.mnt_slave);
return list_entry(p->mnt_slave_list.next, struct mount, mnt_slave);
}
static inline struct mount *next_slave(struct mount *p)
{
return list_entry(p->mnt.mnt_slave.next, struct mount, mnt.mnt_slave);
return list_entry(p->mnt_slave.next, struct mount, mnt_slave);
}
static struct mount *get_peer_under_root(struct mount *mnt,
@ -82,27 +82,27 @@ static int do_make_slave(struct mount *mnt)
if (peer_mnt == mnt)
peer_mnt = NULL;
}
if (IS_MNT_SHARED(&mnt->mnt) && list_empty(&mnt->mnt.mnt_share))
if (IS_MNT_SHARED(&mnt->mnt) && list_empty(&mnt->mnt_share))
mnt_release_group_id(mnt);
list_del_init(&mnt->mnt.mnt_share);
list_del_init(&mnt->mnt_share);
mnt->mnt.mnt_group_id = 0;
if (peer_mnt)
master = peer_mnt;
if (master) {
list_for_each_entry(slave_mnt, &mnt->mnt.mnt_slave_list, mnt.mnt_slave)
list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave)
slave_mnt->mnt_master = master;
list_move(&mnt->mnt.mnt_slave, &master->mnt.mnt_slave_list);
list_splice(&mnt->mnt.mnt_slave_list, master->mnt.mnt_slave_list.prev);
INIT_LIST_HEAD(&mnt->mnt.mnt_slave_list);
list_move(&mnt->mnt_slave, &master->mnt_slave_list);
list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev);
INIT_LIST_HEAD(&mnt->mnt_slave_list);
} else {
struct list_head *p = &mnt->mnt.mnt_slave_list;
struct list_head *p = &mnt->mnt_slave_list;
while (!list_empty(p)) {
slave_mnt = list_first_entry(p,
struct mount, mnt.mnt_slave);
list_del_init(&slave_mnt->mnt.mnt_slave);
struct mount, mnt_slave);
list_del_init(&slave_mnt->mnt_slave);
slave_mnt->mnt_master = NULL;
}
}
@ -122,7 +122,7 @@ void change_mnt_propagation(struct mount *mnt, int type)
}
do_make_slave(mnt);
if (type != MS_SLAVE) {
list_del_init(&mnt->mnt.mnt_slave);
list_del_init(&mnt->mnt_slave);
mnt->mnt_master = NULL;
if (type == MS_UNBINDABLE)
mnt->mnt.mnt_flags |= MNT_UNBINDABLE;
@ -145,7 +145,7 @@ static struct mount *propagation_next(struct mount *m,
struct mount *origin)
{
/* are there any slaves of this mount? */
if (!IS_MNT_NEW(&m->mnt) && !list_empty(&m->mnt.mnt_slave_list))
if (!IS_MNT_NEW(&m->mnt) && !list_empty(&m->mnt_slave_list))
return first_slave(m);
while (1) {
@ -154,7 +154,7 @@ static struct mount *propagation_next(struct mount *m,
if (master == origin->mnt_master) {
struct mount *next = next_peer(m);
return (next == origin) ? NULL : next;
} else if (m->mnt.mnt_slave.next != &master->mnt.mnt_slave_list)
} else if (m->mnt_slave.next != &master->mnt_slave_list)
return next_slave(m);
/* back at master */

4
include/linux/mount.h
View File

@ -58,10 +58,6 @@ struct vfsmount {
#endif
const 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 list_head mnt_slave_list;/* list of slave mounts */
struct list_head mnt_slave; /* slave list entry */
struct mnt_namespace *mnt_ns; /* containing namespace */
int mnt_id; /* mount identifier */
int mnt_group_id; /* peer group identifier */