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authorSteve French <sfrench@us.ibm.com>2008-02-14 06:38:30 +0000
committerSteve French <sfrench@us.ibm.com>2008-02-14 06:38:30 +0000
commit03a143c909b808759f188a45c75acb8f043cb209 (patch)
treec530f351a3bff2997b68009bec280c92eb7098c7
parentc1ce264470f000ccd5965d3718f7d905d559fd64 (diff)
[CIFS] fixup prefixpaths which contain multiple path components
Currently, when we get a prefixpath as part of mount, the kernel only changes the first character to be a '/' or '\' depending on whether posix extensions are enabled. This is problematic as it expects mount.cifs to pass in the correct delimiter in the rest of the prefixpath. But, mount.cifs may not know *what* the correct delimiter is. It's a chicken and egg problem. Note that mount.cifs should not do conversion of the prefixpath - if we want posix behavior then '\' is legal in a path (and we have had bugs in the distant path to prove to me that customers sometimes have apps that require '\'). The kernel code assumes that the path passed in is posix (and current code will handle the first path component fine but was broken for Windows mounts for "deep" prefixpaths unless the user specified a prefixpath with '\' deep in it. So e.g. with current kernel code: 1) mount to //server/share/dir1 will work to all server types 2) mount to //server/share/dir1/subdir1 will work to Samba 3) mount to //server/share/dir1\\subdir1 will work to Windows But case two would fail to Windows without the fix. With the kernel cifs module fix case two now works. First analyzed by Jeff Layton and Simo Sorce CC: Jeff Layton <jlayton@redhat.com> CC: Simo Sorce <simo@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/CHANGES4
-rw-r--r--fs/cifs/connect.c23
2 files changed, 25 insertions, 2 deletions
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index edd248367b3..dbd91461853 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -6,7 +6,9 @@ and sync so that events like out of disk space get reported properly on
cached files. Fix setxattr failure to certain Samba versions. Fix mount
of second share to disconnected server session (autoreconnect on this).
Add ability to modify cifs acls for handling chmod (when mounted with
-cifsacl flag).
+cifsacl flag). Fix prefixpath path separator so we can handle mounts
+with prefixpaths longer than one directory (one path component) when
+mounted to Windows servers.
Version 1.51
------------
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5ccd8b710cc..e111c69139b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1791,6 +1791,20 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
}
}
+static void
+convert_delimiter(char *path, char delim)
+{
+ int i;
+
+ if (path == NULL)
+ return;
+
+ for (i = 0; path[i] != '\0'; i++) {
+ if ((path[i] == '/') || (path[i] == '\\'))
+ path[i] = delim;
+ }
+}
+
int
cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
char *mount_data, const char *devname)
@@ -2056,7 +2070,11 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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);
+ /* we can not convert the / to \ in the path
+ separators in the prefixpath yet because we do not
+ know (until reset_cifs_unix_caps is called later)
+ whether POSIX PATH CAP is available. We normalize
+ the / to \ after reset_cifs_unix_caps is called */
volume_info.prepath = NULL;
} else
cifs_sb->prepathlen = 0;
@@ -2224,6 +2242,9 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
else
tcon->unix_ext = 0; /* server does not support them */
+ /* convert forward to back slashes in prepath here if needed */
+ convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
+
if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
cifs_sb->rsize = 1024 * 127;
cFYI(DBG2,