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vfs: spread struct mount - namespace.c internal iterators

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next_mnt() return value, first argument
skip_mnt_tree() return value and argument

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 18:57:30 -05:00
parent 61ef47b1e4
commit 315fc83e56
1 changed files with 74 additions and 71 deletions
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145
fs/namespace.c
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@ -632,28 +632,28 @@ static void commit_tree(struct vfsmount *mnt)
touch_mnt_namespace(n);
}
static struct vfsmount *next_mnt(struct vfsmount *p, struct vfsmount *root)
static struct mount *next_mnt(struct mount *p, struct vfsmount *root)
{
struct list_head *next = p->mnt_mounts.next;
if (next == &p->mnt_mounts) {
struct list_head *next = p->mnt.mnt_mounts.next;
if (next == &p->mnt.mnt_mounts) {
while (1) {
if (p == root)
if (&p->mnt == root)
return NULL;
next = p->mnt_child.next;
if (next != &p->mnt_parent->mnt_mounts)
next = p->mnt.mnt_child.next;
if (next != &p->mnt.mnt_parent->mnt_mounts)
break;
p = p->mnt_parent;
p = real_mount(p->mnt.mnt_parent);
}
}
return list_entry(next, struct vfsmount, mnt_child);
return list_entry(next, struct mount, mnt.mnt_child);
}
static struct vfsmount *skip_mnt_tree(struct vfsmount *p)
static struct mount *skip_mnt_tree(struct mount *p)
{
struct list_head *prev = p->mnt_mounts.prev;
while (prev != &p->mnt_mounts) {
p = list_entry(prev, struct vfsmount, mnt_child);
prev = p->mnt_mounts.prev;
struct list_head *prev = p->mnt.mnt_mounts.prev;
while (prev != &p->mnt.mnt_mounts) {
p = list_entry(prev, struct mount, mnt.mnt_child);
prev = p->mnt.mnt_mounts.prev;
}
return p;
}
@ -1144,12 +1144,13 @@ int may_umount_tree(struct vfsmount *mnt)
{
int actual_refs = 0;
int minimum_refs = 0;
struct vfsmount *p;
struct mount *p;
BUG_ON(!mnt);
/* write lock needed for mnt_get_count */
br_write_lock(vfsmount_lock);
for (p = mnt; p; p = next_mnt(p, mnt)) {
actual_refs += mnt_get_count(p);
for (p = real_mount(mnt); p; p = next_mnt(p, mnt)) {
actual_refs += mnt_get_count(&p->mnt);
minimum_refs += 2;
}
br_write_unlock(vfsmount_lock);
@ -1220,26 +1221,26 @@ void release_mounts(struct list_head *head)
void umount_tree(struct vfsmount *mnt, int propagate, struct list_head *kill)
{
LIST_HEAD(tmp_list);
struct vfsmount *p;
struct mount *p;
for (p = mnt; p; p = next_mnt(p, mnt))
list_move(&p->mnt_hash, &tmp_list);
for (p = real_mount(mnt); p; p = next_mnt(p, mnt))
list_move(&p->mnt.mnt_hash, &tmp_list);
if (propagate)
propagate_umount(&tmp_list);
list_for_each_entry(p, &tmp_list, mnt_hash) {
list_del_init(&p->mnt_expire);
list_del_init(&p->mnt_list);
__touch_mnt_namespace(p->mnt_ns);
p->mnt_ns = NULL;
__mnt_make_shortterm(p);
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
p->mnt_parent->mnt_ghosts++;
dentry_reset_mounted(p->mnt_mountpoint);
list_for_each_entry(p, &tmp_list, mnt.mnt_hash) {
list_del_init(&p->mnt.mnt_expire);
list_del_init(&p->mnt.mnt_list);
__touch_mnt_namespace(p->mnt.mnt_ns);
p->mnt.mnt_ns = NULL;
__mnt_make_shortterm(&p->mnt);
list_del_init(&p->mnt.mnt_child);
if (mnt_has_parent(&p->mnt)) {
p->mnt.mnt_parent->mnt_ghosts++;
dentry_reset_mounted(p->mnt.mnt_mountpoint);
}
change_mnt_propagation(p, MS_PRIVATE);
change_mnt_propagation(&p->mnt, MS_PRIVATE);
}
list_splice(&tmp_list, kill);
}
@ -1411,7 +1412,7 @@ static int mount_is_safe(struct path *path)
struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry,
int flag)
{
struct vfsmount *res, *p, *q, *r, *s;
struct vfsmount *res, *p, *q, *r;
struct path path;
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(mnt))
@ -1424,19 +1425,20 @@ struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry,
p = mnt;
list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) {
struct mount *s;
if (!is_subdir(r->mnt_mountpoint, dentry))
continue;
for (s = r; s; s = next_mnt(s, r)) {
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(s)) {
for (s = real_mount(r); s; s = next_mnt(s, r)) {
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(&s->mnt)) {
s = skip_mnt_tree(s);
continue;
}
while (p != s->mnt_parent) {
while (p != s->mnt.mnt_parent) {
p = p->mnt_parent;
q = q->mnt_parent;
}
p = s;
p = &s->mnt;
path.mnt = q;
path.dentry = p->mnt_mountpoint;
q = clone_mnt(p, p->mnt_root, flag);
@ -1497,23 +1499,23 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
static void cleanup_group_ids(struct vfsmount *mnt, struct vfsmount *end)
{
struct vfsmount *p;
struct mount *p;
for (p = mnt; p != end; p = next_mnt(p, mnt)) {
if (p->mnt_group_id && !IS_MNT_SHARED(p))
mnt_release_group_id(p);
for (p = real_mount(mnt); &p->mnt != end; p = next_mnt(p, mnt)) {
if (p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt))
mnt_release_group_id(&p->mnt);
}
}
static int invent_group_ids(struct vfsmount *mnt, bool recurse)
{
struct vfsmount *p;
struct mount *p;
for (p = mnt; p; p = recurse ? next_mnt(p, mnt) : NULL) {
if (!p->mnt_group_id && !IS_MNT_SHARED(p)) {
int err = mnt_alloc_group_id(p);
for (p = real_mount(mnt); p; p = recurse ? next_mnt(p, mnt) : NULL) {
if (!p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt)) {
int err = mnt_alloc_group_id(&p->mnt);
if (err) {
cleanup_group_ids(mnt, p);
cleanup_group_ids(mnt, &p->mnt);
return err;
}
}
@ -1591,7 +1593,7 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt,
LIST_HEAD(tree_list);
struct vfsmount *dest_mnt = path->mnt;
struct dentry *dest_dentry = path->dentry;
struct vfsmount *child, *p;
struct mount *child, *p;
int err;
if (IS_MNT_SHARED(dest_mnt)) {
@ -1606,8 +1608,8 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt,
br_write_lock(vfsmount_lock);
if (IS_MNT_SHARED(dest_mnt)) {
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
for (p = real_mount(source_mnt); p; p = next_mnt(p, source_mnt))
set_mnt_shared(&p->mnt);
}
if (parent_path) {
detach_mnt(source_mnt, parent_path);
@ -1618,9 +1620,9 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt,
commit_tree(source_mnt);
}
list_for_each_entry_safe(child, p, &tree_list, mnt_hash) {
list_del_init(&child->mnt_hash);
commit_tree(child);
list_for_each_entry_safe(child, p, &tree_list, mnt.mnt_hash) {
list_del_init(&child->mnt.mnt_hash);
commit_tree(&child->mnt);
}
br_write_unlock(vfsmount_lock);
@ -1697,7 +1699,8 @@ static int flags_to_propagation_type(int flags)
*/
static int do_change_type(struct path *path, int flag)
{
struct vfsmount *m, *mnt = path->mnt;
struct mount *m;
struct vfsmount *mnt = path->mnt;
int recurse = flag & MS_REC;
int type;
int err = 0;
@ -1720,8 +1723,8 @@ static int do_change_type(struct path *path, int flag)
}
br_write_lock(vfsmount_lock);
for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
change_mnt_propagation(m, type);
for (m = real_mount(mnt); m; m = (recurse ? next_mnt(m, mnt) : NULL))
change_mnt_propagation(&m->mnt, type);
br_write_unlock(vfsmount_lock);
out_unlock:
@ -1844,9 +1847,9 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
static inline int tree_contains_unbindable(struct vfsmount *mnt)
{
struct vfsmount *p;
for (p = mnt; p; p = next_mnt(p, mnt)) {
if (IS_MNT_UNBINDABLE(p))
struct mount *p;
for (p = real_mount(mnt); p; p = next_mnt(p, mnt)) {
if (IS_MNT_UNBINDABLE(&p->mnt))
return 1;
}
return 0;
@ -2379,7 +2382,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
{
struct mnt_namespace *new_ns;
struct vfsmount *rootmnt = NULL, *pwdmnt = NULL;
struct vfsmount *p, *q;
struct mount *p, *q;
new_ns = alloc_mnt_ns();
if (IS_ERR(new_ns))
@ -2403,23 +2406,23 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
* as belonging to new namespace. We have already acquired a private
* fs_struct, so tsk->fs->lock is not needed.
*/
p = mnt_ns->root;
q = new_ns->root;
p = real_mount(mnt_ns->root);
q = real_mount(new_ns->root);
while (p) {
q->mnt_ns = new_ns;
__mnt_make_longterm(q);
q->mnt.mnt_ns = new_ns;
__mnt_make_longterm(&q->mnt);
if (fs) {
if (p == fs->root.mnt) {
fs->root.mnt = mntget(q);
__mnt_make_longterm(q);
mnt_make_shortterm(p);
rootmnt = p;
if (&p->mnt == fs->root.mnt) {
fs->root.mnt = mntget(&q->mnt);
__mnt_make_longterm(&q->mnt);
mnt_make_shortterm(&p->mnt);
rootmnt = &p->mnt;
}
if (p == fs->pwd.mnt) {
fs->pwd.mnt = mntget(q);
__mnt_make_longterm(q);
mnt_make_shortterm(p);
pwdmnt = p;
if (&p->mnt == fs->pwd.mnt) {
fs->pwd.mnt = mntget(&q->mnt);
__mnt_make_longterm(&q->mnt);
mnt_make_shortterm(&p->mnt);
pwdmnt = &p->mnt;
}
}
p = next_mnt(p, mnt_ns->root);