[CIFS] Support deep tree mounts (e.g. mounts to //server/share/path)

Samba bugzilla #4040

Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

@@ -1,3 +1,7 @@
+Version 1.46
+------------
+Support deep tree mounts.  Better support OS/2, Win9x (DOS) time stamps.
+
 Version 1.45
 ------------
 Do not time out lockw calls when using posix extensions. Do not
@@ -6,7 +10,8 @@ on requests on other threads.  Improve POSIX locking emulation,
 (lock cancel now works, and unlock of merged range works even
 to Windows servers now).  Fix oops on mount to lanman servers
 (win9x, os/2 etc.) when null password.  Do not send listxattr
-(SMB to query all EAs) if nouser_xattr specified.
+(SMB to query all EAs) if nouser_xattr specified.  Fix SE Linux
+problem (instantiate inodes/dentries in right order for readdir).
 
 Version 1.44
 ------------

fs/cifs/cifs_fs_sb.h

@@ -40,5 +40,7 @@ struct cifs_sb_info {
 	mode_t	mnt_file_mode;
 	mode_t	mnt_dir_mode;
 	int     mnt_cifs_flags;
+	int	prepathlen;
+	char *  prepath;
 };
 #endif				/* _CIFS_FS_SB_H */

fs/cifs/cifsfs.h

@@ -100,5 +100,5 @@ extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t	cifs_listxattr(struct dentry *, char *, size_t);
 extern int cifs_ioctl (struct inode * inode, struct file * filep,
 		       unsigned int command, unsigned long arg);
-#define CIFS_VERSION   "1.45"
+#define CIFS_VERSION   "1.46"
 #endif				/* _CIFSFS_H */

fs/cifs/cifspdu.h

@@ -1344,6 +1344,7 @@ struct smb_t2_rsp {
 #define SMB_QUERY_ATTR_FLAGS            0x206  /* append,immutable etc. */
 #define SMB_QUERY_POSIX_PERMISSION      0x207
 #define SMB_QUERY_POSIX_LOCK            0x208
+/* #define SMB_POSIX_OPEN  		0x209 */
 #define SMB_QUERY_FILE_INTERNAL_INFO    0x3ee
 #define SMB_QUERY_FILE_ACCESS_INFO      0x3f0
 #define SMB_QUERY_FILE_NAME_INFO2       0x3f1 /* 0x30 bytes */
@@ -1363,6 +1364,7 @@ struct smb_t2_rsp {
 #define SMB_SET_XATTR                   0x205
 #define SMB_SET_ATTR_FLAGS              0x206  /* append, immutable etc. */
 #define SMB_SET_POSIX_LOCK              0x208
+#define SMB_POSIX_OPEN                  0x209
 #define SMB_SET_FILE_BASIC_INFO2        0x3ec
 #define SMB_SET_FILE_RENAME_INFORMATION 0x3f2 /* BB check if qpathinfo level too */
 #define SMB_FILE_ALL_INFO2              0x3fa

fs/cifs/connect.c

@@ -89,6 +89,7 @@ struct smb_vol {
 	unsigned int wsize;
 	unsigned int sockopt;
 	unsigned short int port;
+	char * prepath;
 };
 
 static int ipv4_connect(struct sockaddr_in *psin_server, 
@@ -993,6 +994,28 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
 				printk(KERN_WARNING "CIFS: domain name too long\n");
 				return 1;
 			}
+                } else if (strnicmp(data, "prefixpath", 10) == 0) {
+                        if (!value || !*value) {
+                                printk(KERN_WARNING
+                                       "CIFS: invalid path prefix\n");
+                                return 1;       /* needs_arg; */
+                        }
+                        if ((temp_len = strnlen(value, 1024)) < 1024) {
+				if(value[0] != '/')
+					temp_len++;  /* missing leading slash */
+                                vol->prepath = kmalloc(temp_len+1,GFP_KERNEL);
+                                if(vol->prepath == NULL)
+                                        return 1;
+				if(value[0] != '/') {
+					vol->prepath[0] = '/';
+	                                strcpy(vol->prepath+1,value);
+				} else
+					strcpy(vol->prepath,value);
+				cFYI(1,("prefix path %s",vol->prepath));
+                        } else {
+                                printk(KERN_WARNING "CIFS: prefix too long\n");
+                                return 1;
+                        }
 		} else if (strnicmp(data, "iocharset", 9) == 0) {
 			if (!value || !*value) {
 				printk(KERN_WARNING "CIFS: invalid iocharset specified\n");
@@ -1605,6 +1628,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
 		kfree(volume_info.UNC);
 		kfree(volume_info.password);
+		kfree(volume_info.prepath);
 		FreeXid(xid);
 		return -EINVAL;
 	}
@@ -1619,6 +1643,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
            locations such as env variables and files on disk */
 		kfree(volume_info.UNC);
 		kfree(volume_info.password);
+		kfree(volume_info.prepath);
 		FreeXid(xid);
 		return -EINVAL;
 	}
@@ -1639,6 +1664,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			/* we failed translating address */
 			kfree(volume_info.UNC);
 			kfree(volume_info.password);
+			kfree(volume_info.prepath);
 			FreeXid(xid);
 			return -EINVAL;
 		}
@@ -1651,6 +1677,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		cERROR(1,("Connecting to DFS root not implemented yet"));
 		kfree(volume_info.UNC);
 		kfree(volume_info.password);
+		kfree(volume_info.prepath);
 		FreeXid(xid);
 		return -EINVAL;
 	} else /* which servers DFS root would we conect to */ {
@@ -1658,6 +1685,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		       ("CIFS mount error: No UNC path (e.g. -o unc=//192.168.1.100/public) specified"));
 		kfree(volume_info.UNC);
 		kfree(volume_info.password);
+		kfree(volume_info.prepath);
 		FreeXid(xid);
 		return -EINVAL;
 	}
@@ -1672,6 +1700,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			cERROR(1,("CIFS mount error: iocharset %s not found",volume_info.iocharset));
 			kfree(volume_info.UNC);
 			kfree(volume_info.password);
+			kfree(volume_info.prepath);
 			FreeXid(xid);
 			return -ELIBACC;
 		}
@@ -1688,6 +1717,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	else {
 		kfree(volume_info.UNC);
 		kfree(volume_info.password);
+		kfree(volume_info.prepath);
 		FreeXid(xid);
 		return -EINVAL;
 	}
@@ -1710,6 +1740,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 				sock_release(csocket);
 			kfree(volume_info.UNC);
 			kfree(volume_info.password);
+			kfree(volume_info.prepath);
 			FreeXid(xid);
 			return rc;
 		}
@@ -1720,6 +1751,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			sock_release(csocket);
 			kfree(volume_info.UNC);
 			kfree(volume_info.password);
+			kfree(volume_info.prepath);
 			FreeXid(xid);
 			return rc;
 		} else {
@@ -1744,6 +1776,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 				sock_release(csocket);
 				kfree(volume_info.UNC);
 				kfree(volume_info.password);
+				kfree(volume_info.prepath);
 				FreeXid(xid);
 				return rc;
 			}
@@ -1831,6 +1864,14 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			/* Windows ME may prefer this */
 			cFYI(1,("readsize set to minimum 2048"));
 		}
+		/* calculate prepath */
+		cifs_sb->prepath = volume_info.prepath;
+		if(cifs_sb->prepath) {
+			cifs_sb->prepathlen = strlen(cifs_sb->prepath);
+			cifs_sb->prepath[0] = CIFS_DIR_SEP(cifs_sb);
+			volume_info.prepath = NULL;
+		} else 
+			cifs_sb->prepathlen = 0;
 		cifs_sb->mnt_uid = volume_info.linux_uid;
 		cifs_sb->mnt_gid = volume_info.linux_gid;
 		cifs_sb->mnt_file_mode = volume_info.file_mode;
@@ -2008,6 +2049,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	the password ptr is put in the new session structure (in which case the
 	password will be freed at unmount time) */
 	kfree(volume_info.UNC);
+	kfree(volume_info.prepath);
 	FreeXid(xid);
 	return rc;
 }
@@ -3195,6 +3237,7 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
 	int xid;
 	struct cifsSesInfo *ses = NULL;
 	struct task_struct *cifsd_task;
+	char * tmp;
 
 	xid = GetXid();
 
@@ -3228,6 +3271,10 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
 	}
 	
 	cifs_sb->tcon = NULL;
+	tmp = cifs_sb->prepath;
+	cifs_sb->prepathlen = 0;
+	cifs_sb->prepath = NULL;
+	kfree(tmp);
 	if (ses)
 		schedule_timeout_interruptible(msecs_to_jiffies(500));
 	if (ses)

fs/cifs/dir.c

@@ -46,7 +46,8 @@ char *
 build_path_from_dentry(struct dentry *direntry)
 {
 	struct dentry *temp;
-	int namelen = 0;
+	int namelen;
+	int pplen;
 	char *full_path;
 	char dirsep;
 
@@ -56,7 +57,9 @@ build_path_from_dentry(struct dentry *direntry)
 		when the server crashed */
 
 	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
+	pplen = CIFS_SB(direntry->d_sb)->prepathlen;
 cifs_bp_rename_retry:
+	namelen = pplen; 
 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen += (1 + temp->d_name.len);
 		temp = temp->d_parent;
@@ -70,7 +73,6 @@ cifs_bp_rename_retry:
 	if(full_path == NULL)
 		return full_path;
 	full_path[namelen] = 0;	/* trailing null */
-
 	for (temp = direntry; !IS_ROOT(temp);) {
 		namelen -= 1 + temp->d_name.len;
 		if (namelen < 0) {
@@ -79,7 +81,7 @@ cifs_bp_rename_retry:
 			full_path[namelen] = dirsep;
 			strncpy(full_path + namelen + 1, temp->d_name.name,
 				temp->d_name.len);
-			cFYI(0, (" name: %s ", full_path + namelen));
+			cFYI(0, ("name: %s", full_path + namelen));
 		}
 		temp = temp->d_parent;
 		if(temp == NULL) {
@@ -88,18 +90,23 @@ cifs_bp_rename_retry:
 			return NULL;
 		}
 	}
-	if (namelen != 0) {
+	if (namelen != pplen) {
 		cERROR(1,
-		       ("We did not end path lookup where we expected namelen is %d",
+		       ("did not end path lookup where expected namelen is %d",
 			namelen));
-		/* presumably this is only possible if we were racing with a rename 
+		/* presumably this is only possible if racing with a rename 
 		of one of the parent directories  (we can not lock the dentries
 		above us to prevent this, but retrying should be harmless) */
 		kfree(full_path);
-		namelen = 0;
 		goto cifs_bp_rename_retry;
 	}
-
+	/* DIR_SEP already set for byte  0 / vs \ but not for
+	   subsequent slashes in prepath which currently must
+	   be entered the right way - not sure if there is an alternative
+	   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);
 	return full_path;
 }
 

fs/cifs/xattr.c

@@ -269,7 +269,7 @@ ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
 				rc = CIFSSMBGetCIFSACL(xid, pTcon, fid,
 					ea_value, buf_size,
 					ACL_TYPE_ACCESS);
-				CIFSSMBClose(xid, pTcon, fid)
+				CIFSSMBClose(xid, pTcon, fid);
 			}
 		} */  /* BB enable after fixing up return data */