vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb

Signed-off-by: Al Viro <[e-mail]>

fs/autofs4/dev-ioctl.c

···
 		return err;
 	err = -ENOENT;
 	while (path.dentry == path.mnt->mnt_root) {
-		if (path.mnt->mnt_sb->s_magic == AUTOFS_SUPER_MAGIC) {
+		if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) {
 			if (test(&path, data)) {
 				path_get(&path);
 				if (!err) /* already found some */
···
 
 static int test_by_dev(struct path *path, void *p)
 {
-	return path->mnt->mnt_sb->s_dev == *(dev_t *)p;
+	return path->dentry->d_sb->s_dev == *(dev_t *)p;
 }
 
 static int test_by_type(struct path *path, void *p)
···
 			err = find_autofs_mount(name, &path, test_by_type, &type);
 		if (err)
 			goto out;
-		devid = new_encode_dev(path.mnt->mnt_sb->s_dev);
+		devid = new_encode_dev(path.dentry->d_sb->s_dev);
 		err = 0;
 		if (path.mnt->mnt_root == path.dentry) {
 			err = 1;
-			magic = path.mnt->mnt_sb->s_magic;
+			magic = path.dentry->d_sb->s_magic;
 		}
 	} else {
 		dev_t dev = sbi->sb->s_dev;
···
 		err = have_submounts(path.dentry);
 
 		if (follow_down_one(&path))
-			magic = path.mnt->mnt_sb->s_magic;
+			magic = path.dentry->d_sb->s_magic;
 	}
 
 	param->ismountpoint.out.devid = devid;

fs/binfmt_misc.c

···
 			break;
 		case 2: set_bit(Enabled, &e->flags);
 			break;
-		case 3: root = dget(file->f_path.mnt->mnt_sb->s_root);
+		case 3: root = dget(file->f_path.dentry->d_sb->s_root);
 			mutex_lock(&root->d_inode->i_mutex);
 
 			kill_node(e);
···
 	Node *e;
 	struct inode *inode;
 	struct dentry *root, *dentry;
-	struct super_block *sb = file->f_path.mnt->mnt_sb;
+	struct super_block *sb = file->f_path.dentry->d_sb;
 	int err = 0;
 
 	e = create_entry(buffer, count);
···
 	switch (res) {
 		case 1: enabled = 0; break;
 		case 2: enabled = 1; break;
-		case 3: root = dget(file->f_path.mnt->mnt_sb->s_root);
+		case 3: root = dget(file->f_path.dentry->d_sb->s_root);
 			mutex_lock(&root->d_inode->i_mutex);
 
 			while (!list_empty(&entries))

fs/ext3/super.c

···
 		return -EINVAL;
 
 	/* Quotafile not on the same filesystem? */
-	if (path->mnt->mnt_sb != sb)
+	if (path->dentry->d_sb != sb)
 		return -EXDEV;
 	/* Journaling quota? */
 	if (EXT3_SB(sb)->s_qf_names[type]) {

fs/ext4/super.c

···
 		return -EINVAL;
 
 	/* Quotafile not on the same filesystem? */
-	if (path->mnt->mnt_sb != sb)
+	if (path->dentry->d_sb != sb)
 		return -EXDEV;
 	/* Journaling quota? */
 	if (EXT4_SB(sb)->s_qf_names[type]) {

fs/fhandle.c

···
 	 * We need t make sure wether the file system
 	 * support decoding of the file handle
 	 */
-	if (!path->mnt->mnt_sb->s_export_op ||
-	    !path->mnt->mnt_sb->s_export_op->fh_to_dentry)
+	if (!path->dentry->d_sb->s_export_op ||
+	    !path->dentry->d_sb->s_export_op->fh_to_dentry)
 		return -EOPNOTSUPP;
 
 	if (copy_from_user(&f_handle, ufh, sizeof(struct file_handle)))

fs/lockd/svcsubs.c

···
 {
 	struct super_block *sb = datap;
 
-	return sb == file->f_file->f_path.mnt->mnt_sb;
+	return sb == file->f_file->f_path.dentry->d_sb;
 }
 
 /**

fs/nfsd/nfsctl.c

···
 	 * 2.  Is that directory a mount point, or
 	 * 3.  Is that directory the root of an exported file system?
 	 */
-	error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
+	error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 
 	path_put(&path);
 	return error;

fs/quota/dquot.c

···
 	if (error)
 		return error;
 	/* Quota file not on the same filesystem? */
-	if (path->mnt->mnt_sb != sb)
+	if (path->dentry->d_sb != sb)
 		error = -EXDEV;
 	else
 		error = vfs_load_quota_inode(path->dentry->d_inode, type,

fs/reiserfs/super.c

···
 		return -EINVAL;
 
 	/* Quotafile not on the same filesystem? */
-	if (path->mnt->mnt_sb != sb) {
+	if (path->dentry->d_sb != sb) {
 		err = -EXDEV;
 		goto out;
 	}

fs/sysv/itree.c

···
 
 int sysv_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
-	struct super_block *s = mnt->mnt_sb;
+	struct super_block *s = dentry->d_sb;
 	generic_fillattr(dentry->d_inode, stat);
 	stat->blocks = (s->s_blocksize / 512) * sysv_nblocks(s, stat->size);
 	stat->blksize = s->s_blocksize;

init/do_mounts.c

···
 
 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
 {
+	struct super_block *s;
 	int err = sys_mount(name, "/root", fs, flags, data);
 	if (err)
 		return err;
 
 	sys_chdir((const char __user __force *)"/root");
-	ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
+	s = current->fs->pwd.dentry->d_sb;
+	ROOT_DEV = s->s_dev;
 	printk(KERN_INFO
 	       "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
-	       current->fs->pwd.mnt->mnt_sb->s_type->name,
-	       current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
-	       " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
+	       s->s_type->name,
+	       s->s_flags & MS_RDONLY ?  " readonly" : "",
+	       MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
 	return 0;
 }
 

kernel/acct.c

···
 	spin_lock(&acct_lock);
 restart:
 	list_for_each_entry(acct, &acct_list, list)
-		if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) {
+		if (acct->file && acct->file->f_path.dentry->d_sb == sb) {
 			acct_file_reopen(acct, NULL, NULL);
 			goto restart;
 		}

security/selinux/hooks.c

···
 	const struct cred *cred = current_cred();
 
 	if (flags & MS_REMOUNT)
-		return superblock_has_perm(cred, path->mnt->mnt_sb,
+		return superblock_has_perm(cred, path->dentry->d_sb,
 					   FILESYSTEM__REMOUNT, NULL);
 	else
 		return path_has_perm(cred, path, FILE__MOUNTON);

security/smack/smack_lsm.c

···
 static int smack_sb_mount(char *dev_name, struct path *path,
 			  char *type, unsigned long flags, void *data)
 {
-	struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
+	struct superblock_smack *sbp = path->dentry->d_sb->s_security;
 	struct smk_audit_info ad;
 
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
···
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
 	smk_ad_setfield_u_fs_path(&ad, path);
 
-	sbp = mnt->mnt_sb->s_security;
+	sbp = path.dentry->d_sb->s_security;
 	return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
 }