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vfs: take mnt_child/mnt_mounts to struct mount

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 23:24:33 -05:00
commit 6b41d536f7
4 changed files with 26 additions and 26 deletions
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2
fs/mount.h
View file

@ -17,6 +17,8 @@ struct mount {
int mnt_count; int mnt_count;
int mnt_writers; int mnt_writers;
#endif #endif
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
}; };
static inline struct mount *real_mount(struct vfsmount *mnt) static inline struct mount *real_mount(struct vfsmount *mnt)

42
fs/namespace.c
View file

@ -200,8 +200,8 @@ static struct mount *alloc_vfsmnt(const char *name)
#endif #endif
INIT_LIST_HEAD(&p->mnt_hash); INIT_LIST_HEAD(&p->mnt_hash);
INIT_LIST_HEAD(&mnt->mnt_child); INIT_LIST_HEAD(&p->mnt_child);
INIT_LIST_HEAD(&mnt->mnt_mounts); INIT_LIST_HEAD(&p->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list); INIT_LIST_HEAD(&mnt->mnt_list);
INIT_LIST_HEAD(&mnt->mnt_expire); INIT_LIST_HEAD(&mnt->mnt_expire);
INIT_LIST_HEAD(&mnt->mnt_share); INIT_LIST_HEAD(&mnt->mnt_share);
@ -562,7 +562,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
old_path->mnt = &mnt->mnt_parent->mnt; old_path->mnt = &mnt->mnt_parent->mnt;
mnt->mnt_parent = mnt; mnt->mnt_parent = mnt;
mnt->mnt_mountpoint = mnt->mnt.mnt_root; mnt->mnt_mountpoint = mnt->mnt.mnt_root;
list_del_init(&mnt->mnt.mnt_child); list_del_init(&mnt->mnt_child);
list_del_init(&mnt->mnt_hash); list_del_init(&mnt->mnt_hash);
dentry_reset_mounted(old_path->dentry); dentry_reset_mounted(old_path->dentry);
} }
@ -588,7 +588,7 @@ static void attach_mnt(struct mount *mnt, struct path *path)
mnt_set_mountpoint(path->mnt, path->dentry, mnt); mnt_set_mountpoint(path->mnt, path->dentry, mnt);
list_add_tail(&mnt->mnt_hash, mount_hashtable + list_add_tail(&mnt->mnt_hash, mount_hashtable +
hash(path->mnt, path->dentry)); hash(path->mnt, path->dentry));
list_add_tail(&mnt->mnt.mnt_child, &path->mnt->mnt_mounts); list_add_tail(&mnt->mnt_child, &real_mount(path->mnt)->mnt_mounts);
} }
static inline void __mnt_make_longterm(struct mount *mnt) static inline void __mnt_make_longterm(struct mount *mnt)
@ -628,32 +628,32 @@ static void commit_tree(struct mount *mnt)
list_add_tail(&mnt->mnt_hash, mount_hashtable + list_add_tail(&mnt->mnt_hash, mount_hashtable +
hash(&parent->mnt, mnt->mnt_mountpoint)); hash(&parent->mnt, mnt->mnt_mountpoint));
list_add_tail(&mnt->mnt.mnt_child, &parent->mnt.mnt_mounts); list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
touch_mnt_namespace(n); touch_mnt_namespace(n);
} }
static struct mount *next_mnt(struct mount *p, struct vfsmount *root) static struct mount *next_mnt(struct mount *p, struct vfsmount *root)
{ {
struct list_head *next = p->mnt.mnt_mounts.next; struct list_head *next = p->mnt_mounts.next;
if (next == &p->mnt.mnt_mounts) { if (next == &p->mnt_mounts) {
while (1) { while (1) {
if (&p->mnt == root) if (&p->mnt == root)
return NULL; return NULL;
next = p->mnt.mnt_child.next; next = p->mnt_child.next;
if (next != &p->mnt_parent->mnt.mnt_mounts) if (next != &p->mnt_parent->mnt_mounts)
break; break;
p = p->mnt_parent; p = p->mnt_parent;
} }
} }
return list_entry(next, struct mount, mnt.mnt_child); return list_entry(next, struct mount, mnt_child);
} }
static struct mount *skip_mnt_tree(struct mount *p) static struct mount *skip_mnt_tree(struct mount *p)
{ {
struct list_head *prev = p->mnt.mnt_mounts.prev; struct list_head *prev = p->mnt_mounts.prev;
while (prev != &p->mnt.mnt_mounts) { while (prev != &p->mnt_mounts) {
p = list_entry(prev, struct mount, mnt.mnt_child); p = list_entry(prev, struct mount, mnt_child);
prev = p->mnt.mnt_mounts.prev; prev = p->mnt_mounts.prev;
} }
return p; return p;
} }
@ -1238,7 +1238,7 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
__touch_mnt_namespace(p->mnt.mnt_ns); __touch_mnt_namespace(p->mnt.mnt_ns);
p->mnt.mnt_ns = NULL; p->mnt.mnt_ns = NULL;
__mnt_make_shortterm(p); __mnt_make_shortterm(p);
list_del_init(&p->mnt.mnt_child); list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) { if (mnt_has_parent(p)) {
p->mnt_parent->mnt.mnt_ghosts++; p->mnt_parent->mnt.mnt_ghosts++;
dentry_reset_mounted(p->mnt_mountpoint); dentry_reset_mounted(p->mnt_mountpoint);
@ -1427,7 +1427,7 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
q->mnt_mountpoint = mnt->mnt_mountpoint; q->mnt_mountpoint = mnt->mnt_mountpoint;
p = mnt; p = mnt;
list_for_each_entry(r, &mnt->mnt.mnt_mounts, mnt.mnt_child) { list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) {
struct mount *s; struct mount *s;
if (!is_subdir(r->mnt_mountpoint, dentry)) if (!is_subdir(r->mnt_mountpoint, dentry))
continue; continue;
@ -2134,11 +2134,11 @@ static int select_submounts(struct mount *parent, struct list_head *graveyard)
int found = 0; int found = 0;
repeat: repeat:
next = this_parent->mnt.mnt_mounts.next; next = this_parent->mnt_mounts.next;
resume: resume:
while (next != &this_parent->mnt.mnt_mounts) { while (next != &this_parent->mnt_mounts) {
struct list_head *tmp = next; struct list_head *tmp = next;
struct mount *mnt = list_entry(tmp, struct mount, mnt.mnt_child); struct mount *mnt = list_entry(tmp, struct mount, mnt_child);
next = tmp->next; next = tmp->next;
if (!(mnt->mnt.mnt_flags & MNT_SHRINKABLE)) if (!(mnt->mnt.mnt_flags & MNT_SHRINKABLE))
@ -2146,7 +2146,7 @@ resume:
/* /*
* Descend a level if the d_mounts list is non-empty. * Descend a level if the d_mounts list is non-empty.
*/ */
if (!list_empty(&mnt->mnt.mnt_mounts)) { if (!list_empty(&mnt->mnt_mounts)) {
this_parent = mnt; this_parent = mnt;
goto repeat; goto repeat;
} }
@ -2160,7 +2160,7 @@ resume:
* All done at this level ... ascend and resume the search * All done at this level ... ascend and resume the search
*/ */
if (this_parent != parent) { if (this_parent != parent) {
next = this_parent->mnt.mnt_child.next; next = this_parent->mnt_child.next;
this_parent = this_parent->mnt_parent; this_parent = this_parent->mnt_parent;
goto resume; goto resume;
} }

6
fs/pnode.c
View file

@ -303,13 +303,13 @@ int propagate_mount_busy(struct mount *mnt, int refcnt)
* If not, we don't have to go checking for all other * If not, we don't have to go checking for all other
* mounts * mounts
*/ */
if (!list_empty(&mnt->mnt.mnt_mounts) || do_refcount_check(mnt, refcnt)) if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))
return 1; return 1;
for (m = propagation_next(&parent->mnt, &parent->mnt); m; for (m = propagation_next(&parent->mnt, &parent->mnt); m;
m = propagation_next(m, &parent->mnt)) { m = propagation_next(m, &parent->mnt)) {
child = __lookup_mnt(m, mnt->mnt_mountpoint, 0); child = __lookup_mnt(m, mnt->mnt_mountpoint, 0);
if (child && list_empty(&child->mnt.mnt_mounts) && if (child && list_empty(&child->mnt_mounts) &&
(ret = do_refcount_check(child, 1))) (ret = do_refcount_check(child, 1)))
break; break;
} }
@ -336,7 +336,7 @@ static void __propagate_umount(struct mount *mnt)
* umount the child only if the child has no * umount the child only if the child has no
* other children * other children
*/ */
if (child && list_empty(&child->mnt.mnt_mounts)) if (child && list_empty(&child->mnt_mounts))
list_move_tail(&child->mnt_hash, &mnt->mnt_hash); list_move_tail(&child->mnt_hash, &mnt->mnt_hash);
} }
} }

2
include/linux/mount.h
View file

@ -50,8 +50,6 @@ struct mnt_namespace;
struct vfsmount { struct vfsmount {
struct dentry *mnt_root; /* root of the mounted tree */ struct dentry *mnt_root; /* root of the mounted tree */
struct super_block *mnt_sb; /* pointer to superblock */ struct super_block *mnt_sb; /* pointer to superblock */
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
int mnt_flags; int mnt_flags;
/* 4 bytes hole on 64bits arches without fsnotify */ /* 4 bytes hole on 64bits arches without fsnotify */
#ifdef CONFIG_FSNOTIFY #ifdef CONFIG_FSNOTIFY