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vfs: take mnt_master to struct mount 

make IS_MNT_SLAVE take struct mount * at the same time

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-25 00:07:16 -05:00
parent 14cf1fa8f5
commit d10e8def07
4 changed files with 20 additions and 19 deletions
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2
fs/mount.h
View File

@ -19,6 +19,8 @@ struct mount {
#endif #endif
struct list_head mnt_mounts; /* list of children, anchored here */ struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */ struct list_head mnt_child; /* and going through their mnt_child */
/* yet to be moved - up to mnt_slave */
struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
}; };
static inline struct mount *real_mount(struct vfsmount *mnt) static inline struct mount *real_mount(struct vfsmount *mnt)

10
fs/namespace.c
View File

@ -715,14 +715,14 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
if (flag & CL_SLAVE) { if (flag & CL_SLAVE) {
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave_list); list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave_list);
mnt->mnt.mnt_master = &old->mnt; mnt->mnt_master = &old->mnt;
CLEAR_MNT_SHARED(&mnt->mnt); CLEAR_MNT_SHARED(&mnt->mnt);
} else if (!(flag & CL_PRIVATE)) { } else if (!(flag & CL_PRIVATE)) {
if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(&old->mnt)) if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(&old->mnt))
list_add(&mnt->mnt.mnt_share, &old->mnt.mnt_share); list_add(&mnt->mnt.mnt_share, &old->mnt.mnt_share);
if (IS_MNT_SLAVE(&old->mnt)) if (IS_MNT_SLAVE(old))
list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave); list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave);
mnt->mnt.mnt_master = old->mnt.mnt_master; mnt->mnt_master = old->mnt_master;
} }
if (flag & CL_MAKE_SHARED) if (flag & CL_MAKE_SHARED)
set_mnt_shared(mnt); set_mnt_shared(mnt);
@ -1051,8 +1051,8 @@ static int show_mountinfo(struct seq_file *m, void *v)
/* Tagged fields ("foo:X" or "bar") */ /* Tagged fields ("foo:X" or "bar") */
if (IS_MNT_SHARED(mnt)) if (IS_MNT_SHARED(mnt))
seq_printf(m, " shared:%i", mnt->mnt_group_id); seq_printf(m, " shared:%i", mnt->mnt_group_id);
if (IS_MNT_SLAVE(mnt)) { if (IS_MNT_SLAVE(r)) {
int master = mnt->mnt_master->mnt_group_id; int master = r->mnt_master->mnt_group_id;
int dom = get_dominating_id(r, &p->root); int dom = get_dominating_id(r, &p->root);
seq_printf(m, " master:%i", master); seq_printf(m, " master:%i", master);
if (dom && dom != master) if (dom && dom != master)

26
fs/pnode.c
View File

@ -55,7 +55,7 @@ int get_dominating_id(struct mount *mnt, const struct path *root)
{ {
struct mount *m; struct mount *m;
for (m = real_mount(mnt->mnt.mnt_master); m != NULL; m = real_mount(m->mnt.mnt_master)) { for (m = real_mount(mnt->mnt_master); m != NULL; m = real_mount(m->mnt_master)) {
struct mount *d = get_peer_under_root(m, mnt->mnt.mnt_ns, root); struct mount *d = get_peer_under_root(m, mnt->mnt.mnt_ns, root);
if (d) if (d)
return d->mnt.mnt_group_id; return d->mnt.mnt_group_id;
@ -66,8 +66,8 @@ int get_dominating_id(struct mount *mnt, const struct path *root)
static int do_make_slave(struct mount *mnt) static int do_make_slave(struct mount *mnt)
{ {
struct mount *peer_mnt = mnt, *master = real_mount(mnt->mnt.mnt_master); struct mount *peer_mnt = mnt, *master = real_mount(mnt->mnt_master);
struct vfsmount *slave_mnt; struct mount *slave_mnt;
/* /*
* slave 'mnt' to a peer mount that has the * slave 'mnt' to a peer mount that has the
@ -92,7 +92,7 @@ static int do_make_slave(struct mount *mnt)
master = peer_mnt; master = peer_mnt;
if (master) { if (master) {
list_for_each_entry(slave_mnt, &mnt->mnt.mnt_slave_list, mnt_slave) list_for_each_entry(slave_mnt, &mnt->mnt.mnt_slave_list, mnt.mnt_slave)
slave_mnt->mnt_master = &master->mnt; slave_mnt->mnt_master = &master->mnt;
list_move(&mnt->mnt.mnt_slave, &master->mnt.mnt_slave_list); list_move(&mnt->mnt.mnt_slave, &master->mnt.mnt_slave_list);
list_splice(&mnt->mnt.mnt_slave_list, master->mnt.mnt_slave_list.prev); list_splice(&mnt->mnt.mnt_slave_list, master->mnt.mnt_slave_list.prev);
@ -101,12 +101,12 @@ static int do_make_slave(struct mount *mnt)
struct list_head *p = &mnt->mnt.mnt_slave_list; struct list_head *p = &mnt->mnt.mnt_slave_list;
while (!list_empty(p)) { while (!list_empty(p)) {
slave_mnt = list_first_entry(p, slave_mnt = list_first_entry(p,
struct vfsmount, mnt_slave); struct mount, mnt.mnt_slave);
list_del_init(&slave_mnt->mnt_slave); list_del_init(&slave_mnt->mnt.mnt_slave);
slave_mnt->mnt_master = NULL; slave_mnt->mnt_master = NULL;
} }
} }
mnt->mnt.mnt_master = &master->mnt; mnt->mnt_master = &master->mnt;
CLEAR_MNT_SHARED(&mnt->mnt); CLEAR_MNT_SHARED(&mnt->mnt);
return 0; return 0;
} }
@ -123,7 +123,7 @@ void change_mnt_propagation(struct mount *mnt, int type)
do_make_slave(mnt); do_make_slave(mnt);
if (type != MS_SLAVE) { if (type != MS_SLAVE) {
list_del_init(&mnt->mnt.mnt_slave); list_del_init(&mnt->mnt.mnt_slave);
mnt->mnt.mnt_master = NULL; mnt->mnt_master = NULL;
if (type == MS_UNBINDABLE) if (type == MS_UNBINDABLE)
mnt->mnt.mnt_flags |= MNT_UNBINDABLE; mnt->mnt.mnt_flags |= MNT_UNBINDABLE;
else else
@ -149,9 +149,9 @@ static struct mount *propagation_next(struct mount *m,
return first_slave(m); return first_slave(m);
while (1) { while (1) {
struct mount *master = real_mount(m->mnt.mnt_master); struct mount *master = real_mount(m->mnt_master);
if (&master->mnt == origin->mnt.mnt_master) { if (&master->mnt == origin->mnt_master) {
struct mount *next = next_peer(m); struct mount *next = next_peer(m);
return (next == origin) ? NULL : next; return (next == origin) ? NULL : next;
} else if (m->mnt.mnt_slave.next != &master->mnt.mnt_slave_list) } else if (m->mnt.mnt_slave.next != &master->mnt.mnt_slave_list)
@ -179,11 +179,11 @@ static struct mount *get_source(struct mount *dest,
struct mount *p_last_src = NULL; struct mount *p_last_src = NULL;
struct mount *p_last_dest = NULL; struct mount *p_last_dest = NULL;
while (&last_dest->mnt != dest->mnt.mnt_master) { while (&last_dest->mnt != dest->mnt_master) {
p_last_dest = last_dest; p_last_dest = last_dest;
p_last_src = last_src; p_last_src = last_src;
last_dest = real_mount(last_dest->mnt.mnt_master); last_dest = real_mount(last_dest->mnt_master);
last_src = real_mount(last_src->mnt.mnt_master); last_src = real_mount(last_src->mnt_master);
} }
if (p_last_dest) { if (p_last_dest) {

1
include/linux/mount.h
View File

@ -62,7 +62,6 @@ struct vfsmount {
struct list_head mnt_share; /* circular list of shared mounts */ 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_list;/* list of slave mounts */
struct list_head mnt_slave; /* slave list entry */ struct list_head mnt_slave; /* slave list entry */
struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
struct mnt_namespace *mnt_ns; /* containing namespace */ struct mnt_namespace *mnt_ns; /* containing namespace */
int mnt_id; /* mount identifier */ int mnt_id; /* mount identifier */
int mnt_group_id; /* peer group identifier */ int mnt_group_id; /* peer group identifier */