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vfs: spread struct mount - __lookup_mnt() result

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switch __lookup_mnt() to returning struct mount *; callers adjusted.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-24 18:22:03 -05:00
parent 7d6fec45a5
commit c71053659e
5 changed files with 31 additions and 22 deletions
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2
fs/internal.h
View file

@ -15,6 +15,7 @@ struct super_block;
struct file_system_type;
struct linux_binprm;
struct path;
struct mount;
/*
* block_dev.c
@ -46,7 +47,6 @@ extern void __init chrdev_init(void);
extern int copy_mount_options(const void __user *, unsigned long *);
extern int copy_mount_string(const void __user *, char **);
extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
extern struct vfsmount *lookup_mnt(struct path *);
extern int finish_automount(struct vfsmount *, struct path *);

2
fs/mount.h
View file

@ -13,3 +13,5 @@ static inline int mnt_has_parent(struct vfsmount *mnt)
{
return mnt != mnt->mnt_parent;
}
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);

13
fs/namei.c
View file

@ -36,6 +36,7 @@
#include <asm/uaccess.h>
#include "internal.h"
#include "mount.h"
/* [Feb-1997 T. Schoebel-Theuer]
* Fundamental changes in the pathname lookup mechanisms (namei)
@ -884,7 +885,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
struct inode **inode)
{
for (;;) {
struct vfsmount *mounted;
struct mount *mounted;
/*
* Don't forget we might have a non-mountpoint managed dentry
* that wants to block transit.
@ -898,8 +899,8 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
mounted = __lookup_mnt(path->mnt, path->dentry, 1);
if (!mounted)
break;
path->mnt = mounted;
path->dentry = mounted->mnt_root;
path->mnt = &mounted->mnt;
path->dentry = mounted->mnt.mnt_root;
nd->flags |= LOOKUP_JUMPED;
nd->seq = read_seqcount_begin(&path->dentry->d_seq);
/*
@ -915,12 +916,12 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
static void follow_mount_rcu(struct nameidata *nd)
{
while (d_mountpoint(nd->path.dentry)) {
struct vfsmount *mounted;
struct mount *mounted;
mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry, 1);
if (!mounted)
break;
nd->path.mnt = mounted;
nd->path.dentry = mounted->mnt_root;
nd->path.mnt = &mounted->mnt;
nd->path.dentry = mounted->mnt.mnt_root;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
}
}

23
fs/namespace.c
View file

@ -464,20 +464,20 @@ static void free_vfsmnt(struct vfsmount *mnt)
* @dir. If @dir is set return the first mount else return the last mount.
* vfsmount_lock must be held for read or write.
*/
struct vfsmount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry,
struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry,
int dir)
{
struct list_head *head = mount_hashtable + hash(mnt, dentry);
struct list_head *tmp = head;
struct vfsmount *p, *found = NULL;
struct mount *p, *found = NULL;
for (;;) {
tmp = dir ? tmp->next : tmp->prev;
p = NULL;
if (tmp == head)
break;
p = list_entry(tmp, struct vfsmount, mnt_hash);
if (p->mnt_parent == mnt && p->mnt_mountpoint == dentry) {
p = list_entry(tmp, struct mount, mnt.mnt_hash);
if (p->mnt.mnt_parent == mnt && p->mnt.mnt_mountpoint == dentry) {
found = p;
break;
}
@ -491,13 +491,18 @@ struct vfsmount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry,
*/
struct vfsmount *lookup_mnt(struct path *path)
{
struct vfsmount *child_mnt;
struct mount *child_mnt;
br_read_lock(vfsmount_lock);
if ((child_mnt = __lookup_mnt(path->mnt, path->dentry, 1)))
mntget(child_mnt);
br_read_unlock(vfsmount_lock);
return child_mnt;
child_mnt = __lookup_mnt(path->mnt, path->dentry, 1);
if (child_mnt) {
mnt_add_count(child_mnt, 1);
br_read_unlock(vfsmount_lock);
return &child_mnt->mnt;
} else {
br_read_unlock(vfsmount_lock);
return NULL;
}
}
static inline int check_mnt(struct vfsmount *mnt)

13
fs/pnode.c
View file

@ -289,7 +289,8 @@ static inline int do_refcount_check(struct vfsmount *mnt, int count)
*/
int propagate_mount_busy(struct vfsmount *mnt, int refcnt)
{
struct vfsmount *m, *child;
struct vfsmount *m;
struct mount *child;
struct vfsmount *parent = mnt->mnt_parent;
int ret = 0;
@ -307,8 +308,8 @@ int propagate_mount_busy(struct vfsmount *mnt, int refcnt)
for (m = propagation_next(parent, parent); m;
m = propagation_next(m, parent)) {
child = __lookup_mnt(m, mnt->mnt_mountpoint, 0);
if (child && list_empty(&child->mnt_mounts) &&
(ret = do_refcount_check(child, 1)))
if (child && list_empty(&child->mnt.mnt_mounts) &&
(ret = do_refcount_check(&child->mnt, 1)))
break;
}
return ret;
@ -328,14 +329,14 @@ static void __propagate_umount(struct vfsmount *mnt)
for (m = propagation_next(parent, parent); m;
m = propagation_next(m, parent)) {
struct vfsmount *child = __lookup_mnt(m,
struct mount *child = __lookup_mnt(m,
mnt->mnt_mountpoint, 0);
/*
* umount the child only if the child has no
* other children
*/
if (child && list_empty(&child->mnt_mounts))
list_move_tail(&child->mnt_hash, &mnt->mnt_hash);
if (child && list_empty(&child->mnt.mnt_mounts))
list_move_tail(&child->mnt.mnt_hash, &mnt->mnt_hash);
}
}