[CIFS] Fix paths when share is in DFS to include proper prefix
authorSteve French <sfrench@us.ibm.com>
Thu, 15 May 2008 01:50:56 +0000 (01:50 +0000)
committerSteve French <sfrench@us.ibm.com>
Thu, 15 May 2008 01:50:56 +0000 (01:50 +0000)
Some versions of Samba (3.2-pre e.g.) are stricter about checking to make sure that
paths in DFS name spaces are sent in the form \\server\share\dir\subdir ...
instead of \dir\subdir

Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
fs/cifs/cifsproto.h
fs/cifs/connect.c
fs/cifs/dir.c
fs/cifs/inode.c
fs/cifs/link.c

index 08248e8..845b18e 100644 (file)
@@ -150,9 +150,6 @@ extern int CIFSGetDFSRefer(const int xid, struct cifsSesInfo *ses,
                        unsigned int *number_of_UNC_in_array,
                        const struct nls_table *nls_codepage, int remap);
 
-extern int connect_to_dfs_path(int xid, struct cifsSesInfo *pSesInfo,
-                       const char *old_path,
-                       const struct nls_table *nls_codepage, int remap);
 extern int get_dfs_path(int xid, struct cifsSesInfo *pSesInfo,
                        const char *old_path,
                        const struct nls_table *nls_codepage,
index 7c2e5ea..d5747e3 100644 (file)
@@ -1419,27 +1419,6 @@ find_unc(__be32 new_target_ip_addr, char *uncName, char *userName)
 }
 
 int
-connect_to_dfs_path(int xid, struct cifsSesInfo *pSesInfo,
-                   const char *old_path, const struct nls_table *nls_codepage,
-                   int remap)
-{
-       struct dfs_info3_param *referrals = NULL;
-       unsigned int num_referrals;
-       int rc = 0;
-
-       rc = get_dfs_path(xid, pSesInfo, old_path, nls_codepage,
-                       &num_referrals, &referrals, remap);
-
-       /* BB Add in code to: if valid refrl, if not ip address contact
-               the helper that resolves tcp names, mount to it, try to
-               tcon to it unmount it if fail */
-
-       kfree(referrals);
-
-       return rc;
-}
-
-int
 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
             const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
             struct dfs_info3_param **preferrals, int remap)
@@ -2161,10 +2140,11 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
                                if ((strchr(volume_info.UNC + 3, '\\') == NULL)
                                    && (strchr(volume_info.UNC + 3, '/') ==
                                        NULL)) {
-                                       rc = connect_to_dfs_path(xid, pSesInfo,
+/*                                     rc = connect_to_dfs_path(xid, pSesInfo,
                                                "", cifs_sb->local_nls,
                                                cifs_sb->mnt_cifs_flags &
-                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
+                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);*/
+                                       cFYI(1, ("DFS root not supported"));
                                        rc = -ENODEV;
                                        goto out;
                                } else {
index e4e0078..05afe33 100644 (file)
@@ -49,18 +49,25 @@ build_path_from_dentry(struct dentry *direntry)
        struct dentry *temp;
        int namelen;
        int pplen;
+       int dfsplen;
        char *full_path;
        char dirsep;
+       struct cifs_sb_info *cifs_sb;
 
        if (direntry == NULL)
                return NULL;  /* not much we can do if dentry is freed and
                we need to reopen the file after it was closed implicitly
                when the server crashed */
 
-       dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
-       pplen = CIFS_SB(direntry->d_sb)->prepathlen;
+       cifs_sb = CIFS_SB(direntry->d_sb);
+       dirsep = CIFS_DIR_SEP(cifs_sb);
+       pplen = cifs_sb->prepathlen;
+       if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
+               dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
+       else
+               dfsplen = 0;
 cifs_bp_rename_retry:
-       namelen = pplen;
+       namelen = pplen + dfsplen;
        for (temp = direntry; !IS_ROOT(temp);) {
                namelen += (1 + temp->d_name.len);
                temp = temp->d_parent;
@@ -91,7 +98,7 @@ cifs_bp_rename_retry:
                        return NULL;
                }
        }
-       if (namelen != pplen) {
+       if (namelen != pplen + dfsplen) {
                cERROR(1,
                       ("did not end path lookup where expected namelen is %d",
                        namelen));
@@ -107,7 +114,18 @@ cifs_bp_rename_retry:
           since the '\' is a valid posix character so we can not switch
           those safely to '/' if any are found in the middle of the prepath */
        /* BB test paths to Windows with '/' in the midst of prepath */
-       strncpy(full_path, CIFS_SB(direntry->d_sb)->prepath, pplen);
+
+       if (dfsplen) {
+               strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
+               if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
+                       int i;
+                       for (i = 0; i < dfsplen; i++) {
+                               if (full_path[i] == '\\')
+                                       full_path[i] = '/';
+                       }
+               }
+       }
+       strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
        return full_path;
 }
 
index 2d53b43..9d9b56a 100644 (file)
@@ -161,52 +161,18 @@ static void cifs_unix_info_to_inode(struct inode *inode,
        spin_unlock(&inode->i_lock);
 }
 
-static const unsigned char *cifs_get_search_path(struct cifs_sb_info *cifs_sb,
-                                               const char *search_path)
-{
-       int tree_len;
-       int path_len;
-       int i;
-       char *tmp_path;
-       struct cifsTconInfo *pTcon = cifs_sb->tcon;
-
-       if (!(pTcon->Flags & SMB_SHARE_IS_IN_DFS))
-               return search_path;
-
-       /* use full path name for working with DFS */
-       tree_len = strnlen(pTcon->treeName, MAX_TREE_SIZE + 1);
-       path_len = strnlen(search_path, MAX_PATHCONF);
-
-       tmp_path = kmalloc(tree_len+path_len+1, GFP_KERNEL);
-       if (tmp_path == NULL)
-               return search_path;
-
-       strncpy(tmp_path, pTcon->treeName, tree_len);
-       if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
-               for (i = 0; i < tree_len; i++) {
-                       if (tmp_path[i] == '\\')
-                               tmp_path[i] = '/';
-               }
-       strncpy(tmp_path+tree_len, search_path, path_len);
-       tmp_path[tree_len+path_len] = 0;
-       return tmp_path;
-}
-
 int cifs_get_inode_info_unix(struct inode **pinode,
-       const unsigned char *search_path, struct super_block *sb, int xid)
+       const unsigned char *full_path, struct super_block *sb, int xid)
 {
        int rc = 0;
        FILE_UNIX_BASIC_INFO findData;
        struct cifsTconInfo *pTcon;
        struct inode *inode;
        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-       const unsigned char *full_path;
        bool is_dfs_referral = false;
 
        pTcon = cifs_sb->tcon;
-       cFYI(1, ("Getting info on %s", search_path));
-
-       full_path = cifs_get_search_path(cifs_sb, search_path);
+       cFYI(1, ("Getting info on %s", full_path));
 
 try_again_CIFSSMBUnixQPathInfo:
        /* could have done a find first instead but this returns more info */
@@ -218,10 +184,6 @@ try_again_CIFSSMBUnixQPathInfo:
        if (rc) {
                if (rc == -EREMOTE && !is_dfs_referral) {
                        is_dfs_referral = true;
-                       if (full_path != search_path) {
-                               kfree(full_path);
-                               full_path = search_path;
-                       }
                        goto try_again_CIFSSMBUnixQPathInfo;
                }
                goto cgiiu_exit;
@@ -271,8 +233,6 @@ try_again_CIFSSMBUnixQPathInfo:
                cifs_set_ops(inode, is_dfs_referral);
        }
 cgiiu_exit:
-       if (full_path != search_path)
-               kfree(full_path);
        return rc;
 }
 
@@ -380,20 +340,19 @@ static int get_sfu_mode(struct inode *inode,
 }
 
 int cifs_get_inode_info(struct inode **pinode,
-       const unsigned char *search_path, FILE_ALL_INFO *pfindData,
+       const unsigned char *full_path, FILE_ALL_INFO *pfindData,
        struct super_block *sb, int xid, const __u16 *pfid)
 {
        int rc = 0;
        struct cifsTconInfo *pTcon;
        struct inode *inode;
        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-       const unsigned char *full_path = NULL;
        char *buf = NULL;
        bool adjustTZ = false;
        bool is_dfs_referral = false;
 
        pTcon = cifs_sb->tcon;
-       cFYI(1, ("Getting info on %s", search_path));
+       cFYI(1, ("Getting info on %s", full_path));
 
        if ((pfindData == NULL) && (*pinode != NULL)) {
                if (CIFS_I(*pinode)->clientCanCacheRead) {
@@ -409,8 +368,6 @@ int cifs_get_inode_info(struct inode **pinode,
                        return -ENOMEM;
                pfindData = (FILE_ALL_INFO *)buf;
 
-               full_path = cifs_get_search_path(cifs_sb, search_path);
-
 try_again_CIFSSMBQPathInfo:
                /* could do find first instead but this returns more info */
                rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
@@ -432,10 +389,6 @@ try_again_CIFSSMBQPathInfo:
        if (rc) {
                if (rc == -EREMOTE && !is_dfs_referral) {
                        is_dfs_referral = true;
-                       if (full_path != search_path) {
-                               kfree(full_path);
-                               full_path = search_path;
-                       }
                        goto try_again_CIFSSMBQPathInfo;
                }
                goto cgii_exit;
@@ -470,7 +423,7 @@ try_again_CIFSSMBQPathInfo:
                                __u64 inode_num;
 
                                rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
-                                       search_path, &inode_num,
+                                       full_path, &inode_num,
                                        cifs_sb->local_nls,
                                        cifs_sb->mnt_cifs_flags &
                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
@@ -539,7 +492,7 @@ try_again_CIFSSMBQPathInfo:
                           (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
                        if (decode_sfu_inode(inode,
                                         le64_to_cpu(pfindData->EndOfFile),
-                                        search_path,
+                                        full_path,
                                         cifs_sb, xid))
                                cFYI(1, ("Unrecognized sfu inode type"));
 
@@ -582,12 +535,12 @@ try_again_CIFSSMBQPathInfo:
                /* fill in 0777 bits from ACL */
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
                        cFYI(1, ("Getting mode bits from ACL"));
-                       acl_to_uid_mode(inode, search_path, pfid);
+                       acl_to_uid_mode(inode, full_path, pfid);
                }
 #endif
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
                        /* fill in remaining high mode bits e.g. SUID, VTX */
-                       get_sfu_mode(inode, search_path, cifs_sb, xid);
+                       get_sfu_mode(inode, full_path, cifs_sb, xid);
                } else if (atomic_read(&cifsInfo->inUse) == 0) {
                        inode->i_uid = cifs_sb->mnt_uid;
                        inode->i_gid = cifs_sb->mnt_gid;
@@ -599,8 +552,6 @@ try_again_CIFSSMBQPathInfo:
                cifs_set_ops(inode, is_dfs_referral);
        }
 cgii_exit:
-       if (full_path != search_path)
-               kfree(full_path);
        kfree(buf);
        return rc;
 }
index 1c2c3ce..316f983 100644 (file)
@@ -295,45 +295,9 @@ cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
                                cFYI(1, ("Error closing junction point "
                                         "(open for ioctl)"));
                        }
-                       /* BB unwind this long, nested function, or remove BB */
-                       if (rc == -EIO) {
-                               /* Query if DFS Junction */
-                               unsigned int num_referrals = 0;
-                               struct dfs_info3_param *refs = NULL;
-                               tmp_path =
-                                       kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
-                                               GFP_KERNEL);
-                               if (tmp_path) {
-                                       strncpy(tmp_path, pTcon->treeName,
-                                               MAX_TREE_SIZE);
-                                       strncat(tmp_path, full_path,
-                                               MAX_PATHCONF);
-                                       rc = get_dfs_path(xid, pTcon->ses,
-                                               tmp_path,
-                                               cifs_sb->local_nls,
-                                               &num_referrals, &refs,
-                                               cifs_sb->mnt_cifs_flags &
-                                                   CIFS_MOUNT_MAP_SPECIAL_CHR);
-                                       cFYI(1, ("Get DFS for %s rc = %d ",
-                                               tmp_path, rc));
-                                       if ((num_referrals == 0) && (rc == 0))
-                                               rc = -EACCES;
-                                       else {
-                                               cFYI(1, ("num referral: %d",
-                                                       num_referrals));
-                                               if (refs && refs->path_name) {
-                                                       strncpy(tmpbuffer,
-                                                               refs->path_name,
-                                                               len-1);
-                                               }
-                                       }
-                                       kfree(refs);
-                                       kfree(tmp_path);
-}
-                               /* BB add code like else decode referrals
-                               then memcpy to tmpbuffer and free referrals
-                               string array BB */
-                       }
+                       /* If it is a DFS junction earlier we would have gotten
+                          PATH_NOT_COVERED returned from server so we do
+                          not need to request the DFS info here */
                }
        }
        /* BB Anything else to do to handle recursive links? */