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Commit fec11dd9 authored by Al Viro's avatar Al Viro
Browse files

Fix cifs_get_root() 



Add missing ->i_mutex, convert to lookup_one_len() instead of
(broken) open-coded analog, cope with getting something like
a//b as relative pathname.  Simplify the hell out of it, while
we are there...

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
parent 0916a5e4

fs/cifs/cifsfs.c

+29 −71
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/delay.h>

#include <linux/kthread.h>

#include <linux/freezer.h>

#include <linux/namei.h>

#include <net/ipv6.h>

#include "cifsfs.h"

#include "cifspdu.h"
@@ -542,14 +543,12 @@ static const struct super_operations cifs_super_ops = { 
static struct dentry *

cifs_get_root(struct smb_vol *vol, struct super_block *sb)

{

	int xid, rc;

	struct inode *inode;

	struct qstr name;

	struct dentry *dparent = NULL, *dchild = NULL, *alias;

	struct dentry *dentry;

	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);

	unsigned int i, full_len, len;

	char *full_path = NULL, *pstart;

	char *full_path = NULL;

	char *s, *p;

	char sep;

	int xid;



	full_path = cifs_build_path_to_root(vol, cifs_sb,

					    cifs_sb_master_tcon(cifs_sb));
@@ -560,73 +559,32 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb) 


	xid = GetXid();

	sep = CIFS_DIR_SEP(cifs_sb);

	dparent = dget(sb->s_root);

	full_len = strlen(full_path);

	full_path[full_len] = sep;

	pstart = full_path + 1;



	for (i = 1, len = 0; i <= full_len; i++) {

		if (full_path[i] != sep || !len) {

			len++;

			continue;

		}

	dentry = dget(sb->s_root);

	p = s = full_path;



		full_path[i] = 0;

		cFYI(1, "get dentry for %s", pstart);



		name.name = pstart;

		name.len = len;

		name.hash = full_name_hash(pstart, len);

		dchild = d_lookup(dparent, &name);

		if (dchild == NULL) {

			cFYI(1, "not exists");

			dchild = d_alloc(dparent, &name);

			if (dchild == NULL) {

				dput(dparent);

				dparent = ERR_PTR(-ENOMEM);

				goto out;

			}

		}

	do {

		struct inode *dir = dentry->d_inode;

		struct dentry *child;



		cFYI(1, "get inode");

		if (dchild->d_inode == NULL) {

			cFYI(1, "not exists");

			inode = NULL;

			if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)

				rc = cifs_get_inode_info_unix(&inode, full_path,

							      sb, xid);

			else

				rc = cifs_get_inode_info(&inode, full_path,

							 NULL, sb, xid, NULL);

			if (rc) {

				dput(dchild);

				dput(dparent);

				dparent = ERR_PTR(rc);

				goto out;

			}

			alias = d_materialise_unique(dchild, inode);

			if (alias != NULL) {

				dput(dchild);

				if (IS_ERR(alias)) {

					dput(dparent);

					dparent = ERR_PTR(-EINVAL); /* XXX */

					goto out;

				}

				dchild = alias;

			}

		}

		cFYI(1, "parent %p, child %p", dparent, dchild);



		dput(dparent);

		dparent = dchild;

		len = 0;

		pstart = full_path + i + 1;

		full_path[i] = sep;

	}

out:

		/* skip separators */

		while (*s == sep)

			s++;

		if (!*s)

			break;

		p = s++;

		/* next separator */

		while (*s && *s != sep)

			s++;



		mutex_lock(&dir->i_mutex);

		child = lookup_one_len(p, dentry, s - p);

		mutex_unlock(&dir->i_mutex);

		dput(dentry);

		dentry = child;

	} while (!IS_ERR(dentry));

	_FreeXid(xid);

	kfree(full_path);

	return dparent;

	return dentry;

}



static int cifs_set_super(struct super_block *sb, void *data)