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authorSteve French <smfrench@gmail.com>2015-11-03 09:15:03 -0600
committerSteve French <smfrench@gmail.com>2015-11-03 09:15:03 -0600
commitb618f001a20e44f691dd0e2ffea651a40a651871 (patch)
tree7af5635f4a0346ed98d64b8ea06c244c821614b9 /fs/cifs
parentb2a3077414fd6ff1de8972ea55e91f27bcabd913 (diff)
[SMB3] Enable checking for continuous availability and persistent handle support
Validate "persistenthandles" and "nopersistenthandles" mount options against the support the server claims in negotiate and tree connect SMB3 responses. Signed-off-by: Steve French <steve.french@primarydata.com> Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/connect.c30
-rw-r--r--fs/cifs/smb2ops.c6
3 files changed, 34 insertions, 3 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 1849e29099d0..28bd477f6e57 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -897,6 +897,7 @@ struct cifs_tcon {
bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
bool broken_sparse_sup; /* if server or share does not support sparse */
bool need_reconnect:1; /* connection reset, tid now invalid */
+ bool use_persistent:1; /* use persistent instead of durable handles */
#ifdef CONFIG_CIFS_SMB2
bool print:1; /* set if connection to printer share */
bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 9a9a543ddf4e..bb35ae735a8e 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2673,6 +2673,30 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
}
tcon->seal = volume_info->seal;
+ tcon->use_persistent = false;
+ /* check if SMB2 or later, CIFS does not support persistent handles */
+ if (volume_info->persistent) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "SMB3 or later required for persistent handles\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ } else if (ses->server->capabilities &
+ SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
+ tcon->use_persistent = true;
+ else /* persistent handles requested but not supported */ {
+ cifs_dbg(VFS,
+ "Persistent handles not supported on share\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ }
+ } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
+ && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
+ && (volume_info->nopersistent == false)) {
+ cifs_dbg(FYI, "enabling persistent handles\n");
+ tcon->use_persistent = true;
+ }
+
/*
* We can have only one retry value for a connection to a share so for
* resources mounted more than once to the same server share the last
@@ -3521,6 +3545,12 @@ try_mount_again:
goto mount_fail_check;
}
+ if ((volume_info->persistent == true) && ((ses->server->capabilities &
+ SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
+ cifs_dbg(VFS, "persistent handles not supported by server\n");
+ rc = -EOPNOTSUPP;
+ goto mount_fail_check;
+ }
/* search for existing tcon to this server share */
tcon = cifs_get_tcon(ses, volume_info);
if (IS_ERR(tcon)) {
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 2f169eb79b4a..53ccdde6ff18 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1838,7 +1838,7 @@ struct smb_version_values smb21_values = {
struct smb_version_values smb30_values = {
.version_string = SMB30_VERSION_STRING,
.protocol_id = SMB30_PROT_ID,
- .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
+ .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES,
.large_lock_type = 0,
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -1858,7 +1858,7 @@ struct smb_version_values smb30_values = {
struct smb_version_values smb302_values = {
.version_string = SMB302_VERSION_STRING,
.protocol_id = SMB302_PROT_ID,
- .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
+ .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES,
.large_lock_type = 0,
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -1879,7 +1879,7 @@ struct smb_version_values smb302_values = {
struct smb_version_values smb311_values = {
.version_string = SMB311_VERSION_STRING,
.protocol_id = SMB311_PROT_ID,
- .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
+ .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES,
.large_lock_type = 0,
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,