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authorJeff Layton <jlayton@redhat.com>2010-10-06 19:51:12 -0400
committerSteve French <sfrench@us.ibm.com>2010-10-07 18:30:45 +0000
commit0eb8a132c449c755b7a3f18f33365b2040c47347 (patch)
treedcf3e0f4a69129827a8acb21b5884bd539cf6d27 /fs/cifs
parent9d002df492b14c690425d9785530371b6c1ccbca (diff)
cifs: add "multiuser" mount option
This allows someone to declare a mount as a multiuser mount. Multiuser mounts also imply "noperm" since we want to allow the server to handle permission checking. It also (for now) requires Kerberos authentication. Eventually, we could expand this to other authtypes, but that requires a scheme to allow per-user credential stashing in some form. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/connect.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 3156a9de947d..e65f72d1f23b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -100,6 +100,7 @@ struct smb_vol {
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
+ bool multiuser:1;
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
@@ -1347,6 +1348,8 @@ cifs_parse_mount_options(char *options, const char *devname,
vol->fsc = true;
} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
vol->mfsymlinks = true;
+ } else if (strnicmp(data, "multiuser", 8) == 0) {
+ vol->multiuser = true;
} else
printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
data);
@@ -1378,6 +1381,13 @@ cifs_parse_mount_options(char *options, const char *devname,
return 1;
}
}
+
+ if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
+ cERROR(1, "Multiuser mounts currently require krb5 "
+ "authentication!");
+ return 1;
+ }
+
if (vol->UNCip == NULL)
vol->UNCip = &vol->UNC[2];
@@ -2563,6 +2573,9 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
if (pvolume_info->fsc)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
+ if (pvolume_info->multiuser)
+ cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
+ CIFS_MOUNT_NO_PERM);
if (pvolume_info->direct_io) {
cFYI(1, "mounting share using direct i/o");
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;