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vfs: spread struct mount - mnt_has_parent

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 21:47:05 -05:00
parent 1ab5973862
commit 676da58df7
3 changed files with 13 additions and 12 deletions
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3
fs/dcache.c
View File

@ -2460,8 +2460,9 @@ static int prepend_path(const struct path *path,
struct dentry * parent;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
struct mount *mnt = real_mount(vfsmnt);
/* Global root? */
if (!mnt_has_parent(vfsmnt))
if (!mnt_has_parent(mnt))
goto global_root;
dentry = vfsmnt->mnt_mountpoint;
vfsmnt = vfsmnt->mnt_parent;

4
fs/mount.h
View File

@ -10,9 +10,9 @@ static inline struct mount *real_mount(struct vfsmount *mnt)
return container_of(mnt, struct mount, mnt);
}
static inline int mnt_has_parent(struct vfsmount *mnt)
static inline int mnt_has_parent(struct mount *mnt)
{
return mnt != mnt->mnt_parent;
return &mnt->mnt != mnt->mnt.mnt_parent;
}
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);

18
fs/namespace.c
View File

@ -1195,7 +1195,7 @@ void release_mounts(struct list_head *head)
while (!list_empty(head)) {
mnt = list_first_entry(head, struct mount, mnt_hash);
list_del_init(&mnt->mnt_hash);
if (mnt_has_parent(&mnt->mnt)) {
if (mnt_has_parent(mnt)) {
struct dentry *dentry;
struct vfsmount *m;
@ -1235,7 +1235,7 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
p->mnt.mnt_ns = NULL;
__mnt_make_shortterm(&p->mnt);
list_del_init(&p->mnt.mnt_child);
if (mnt_has_parent(&p->mnt)) {
if (mnt_has_parent(p)) {
p->mnt.mnt_parent->mnt_ghosts++;
dentry_reset_mounted(p->mnt.mnt_mountpoint);
}
@ -1861,7 +1861,7 @@ static inline int tree_contains_unbindable(struct mount *mnt)
static int do_move_mount(struct path *path, char *old_name)
{
struct path old_path, parent_path;
struct vfsmount *p;
struct mount *p;
struct mount *old;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
@ -1889,7 +1889,7 @@ static int do_move_mount(struct path *path, char *old_name)
old = real_mount(old_path.mnt);
if (!mnt_has_parent(old_path.mnt))
if (!mnt_has_parent(old))
goto out1;
if (S_ISDIR(path->dentry->d_inode->i_mode) !=
@ -1908,8 +1908,8 @@ static int do_move_mount(struct path *path, char *old_name)
tree_contains_unbindable(old))
goto out1;
err = -ELOOP;
for (p = path->mnt; mnt_has_parent(p); p = p->mnt_parent)
if (p == old_path.mnt)
for (p = real_mount(path->mnt); mnt_has_parent(p); p = real_mount(p->mnt.mnt_parent))
if (p == old)
goto out1;
err = attach_recursive_mnt(old, path, &parent_path);
@ -2562,7 +2562,7 @@ out_type:
bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
const struct path *root)
{
while (mnt != root->mnt && mnt_has_parent(mnt)) {
while (mnt != root->mnt && mnt_has_parent(real_mount(mnt))) {
dentry = mnt->mnt_mountpoint;
mnt = mnt->mnt_parent;
}
@ -2652,11 +2652,11 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
error = -EINVAL;
if (root.mnt->mnt_root != root.dentry)
goto out4; /* not a mountpoint */
if (!mnt_has_parent(root.mnt))
if (!mnt_has_parent(root_mnt))
goto out4; /* not attached */
if (new.mnt->mnt_root != new.dentry)
goto out4; /* not a mountpoint */
if (!mnt_has_parent(new.mnt))
if (!mnt_has_parent(new_mnt))
goto out4; /* not attached */
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(old.mnt, old.dentry, &new))