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Commit c7105365 authored by Al Viro's avatar Al Viro
Browse files

vfs: spread struct mount - __lookup_mnt() result 



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

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7d6fec45

fs/internal.h

+1 −1
Original line number Diff line number Diff line
@@ -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 *);

fs/mount.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

fs/namei.c

+7 −6
Original line number Diff line number Diff line
@@ -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);

	}

}

fs/namespace.c

+14 −9
Original line number Diff line number Diff line
@@ -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);

	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;

		return &child_mnt->mnt;

	} else {

		br_read_unlock(vfsmount_lock);

		return NULL;

	}

}



static inline int check_mnt(struct vfsmount *mnt)

fs/pnode.c

+7 −6
Original line number Diff line number Diff line
@@ -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);

	}

}