[CIFS] Allow disabling CIFS Unix Extensions as mount option
Previously the only way to do this was to umount all mounts to that server,
turn off a proc setting (/proc/fs/cifs/LinuxExtensionsEnabled).
Fixes Samba bugzilla bug number: 4582 (and also 2008)
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 8b341a8..e93da7a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -85,6 +85,7 @@
unsigned direct_io:1;
unsigned remap:1; /* set to remap seven reserved chars in filenames */
unsigned posix_paths:1; /* unset to not ask for posix pathnames. */
+ unsigned no_linux_ext:1;
unsigned sfu_emul:1;
unsigned nullauth:1; /* attempt to authenticate with null user */
unsigned nocase; /* request case insensitive filenames */
@@ -1192,6 +1193,10 @@
vol->posix_paths = 1;
} else if (strnicmp(data, "noposixpaths", 12) == 0) {
vol->posix_paths = 0;
+ } else if (strnicmp(data, "nounix", 6) == 0) {
+ vol->no_linux_ext = 1;
+ } else if (strnicmp(data, "nolinux", 7) == 0) {
+ vol->no_linux_ext = 1;
} else if ((strnicmp(data, "nocase", 6) == 0) ||
(strnicmp(data, "ignorecase", 10) == 0)) {
vol->nocase = 1;
@@ -1665,6 +1670,18 @@
* and once without posixacls or posix paths? */
__u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
+ if (vol_info && vol_info->no_linux_ext) {
+ tcon->fsUnixInfo.Capability = 0;
+ tcon->unix_ext = 0; /* Unix Extensions disabled */
+ cFYI(1, ("Linux protocol extensions disabled"));
+ return;
+ } else if (vol_info)
+ tcon->unix_ext = 1; /* Unix Extensions supported */
+
+ if (tcon->unix_ext == 0) {
+ cFYI(1, ("Unix extensions disabled so not set on reconnect"));
+ return;
+ }
if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
__u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
@@ -1678,10 +1695,6 @@
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0)
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
-
-
-
-
}
cap &= CIFS_UNIX_CAP_MASK;
@@ -2176,13 +2189,17 @@
/* tell server which Unix caps we support */
if (tcon->ses->capabilities & CAP_UNIX)
+ /* reset of caps checks mount to see if unix extensions
+ disabled for just this mount */
reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
- else if (cifs_sb->rsize > (1024 * 127)) {
+ else
+ tcon->unix_ext = 0; /* server does not support them */
+
+ if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
cifs_sb->rsize = 1024 * 127;
#ifdef CONFIG_CIFS_DEBUG2
- cFYI(1, ("no very large read support, rsize 127K"));
+ cFYI(1, ("no very large read support, rsize now 127K"));
#endif
-
}
if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
cifs_sb->wsize = min(cifs_sb->wsize,