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authorSteve French <stfrench@microsoft.com>2019-09-12 04:46:20 +0200
committerSteve French <stfrench@microsoft.com>2019-09-16 18:43:38 +0200
commit3e7a02d47872081f4b6234a9f72500f1d10f060c (patch)
tree9d1b1a19b0d85510b38b6afbe848d24080ca62fc /fs/cifs
parentsmb3: improve handling of share deleted (and share recreated) (diff)
downloadlinux-3e7a02d47872081f4b6234a9f72500f1d10f060c.tar.xz
linux-3e7a02d47872081f4b6234a9f72500f1d10f060c.zip
smb3: allow disabling requesting leases
In some cases to work around server bugs or performance problems it can be helpful to be able to disable requesting SMB2.1/SMB3 leases on a particular mount (not to all servers and all shares we are mounted to). Add new mount parm "nolease" which turns off requesting leases on directory or file opens. Currently the only way to disable leases is globally through a module load parameter. This is more granular. Suggested-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> CC: Stable <stable@vger.kernel.org>
Diffstat (limited to '')
-rw-r--r--fs/cifs/cifsfs.c2
-rw-r--r--fs/cifs/cifsglob.h2
-rw-r--r--fs/cifs/connect.c9
-rw-r--r--fs/cifs/smb2pdu.c2
4 files changed, 13 insertions, 2 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index c1b685072063..69601a9b29ad 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -438,6 +438,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
cifs_show_security(s, tcon->ses);
cifs_show_cache_flavor(s, cifs_sb);
+ if (tcon->no_lease)
+ seq_puts(s, ",nolease");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
seq_puts(s, ",multiuser");
else if (tcon->ses->user_name)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index ef2199913217..09b60ec5de3e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -579,6 +579,7 @@ struct smb_vol {
bool noblocksnd:1;
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
+ bool no_lease:1; /* disable requesting leases */
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
bool multiuser:1;
@@ -1090,6 +1091,7 @@ struct cifs_tcon {
bool need_reopen_files:1; /* need to reopen tcon file handles */
bool use_resilient:1; /* use resilient instead of durable handles */
bool use_persistent:1; /* use persistent instead of durable handles */
+ bool no_lease:1; /* Do not request leases on files or directories */
__le32 capabilities;
__u32 share_flags;
__u32 maximal_access;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index df1ccb581828..e16b6cc1e31b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -74,7 +74,7 @@ enum {
Opt_user_xattr, Opt_nouser_xattr,
Opt_forceuid, Opt_noforceuid,
Opt_forcegid, Opt_noforcegid,
- Opt_noblocksend, Opt_noautotune,
+ Opt_noblocksend, Opt_noautotune, Opt_nolease,
Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
Opt_mapposix, Opt_nomapposix,
Opt_mapchars, Opt_nomapchars, Opt_sfu,
@@ -135,6 +135,7 @@ static const match_table_t cifs_mount_option_tokens = {
{ Opt_noforcegid, "noforcegid" },
{ Opt_noblocksend, "noblocksend" },
{ Opt_noautotune, "noautotune" },
+ { Opt_nolease, "nolease" },
{ Opt_hard, "hard" },
{ Opt_soft, "soft" },
{ Opt_perm, "perm" },
@@ -1738,6 +1739,9 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
case Opt_noautotune:
vol->noautotune = 1;
break;
+ case Opt_nolease:
+ vol->no_lease = 1;
+ break;
case Opt_hard:
vol->retry = 1;
break;
@@ -3294,6 +3298,8 @@ static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
return 0;
if (tcon->handle_timeout != volume_info->handle_timeout)
return 0;
+ if (tcon->no_lease != volume_info->no_lease)
+ return 0;
return 1;
}
@@ -3516,6 +3522,7 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
tcon->nocase = volume_info->nocase;
tcon->nohandlecache = volume_info->nohandlecache;
tcon->local_lease = volume_info->local_lease;
+ tcon->no_lease = volume_info->no_lease;
INIT_LIST_HEAD(&tcon->pending_opens);
spin_lock(&cifs_tcp_ses_lock);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 01d5c4af2458..ce647cfdc04f 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2459,7 +2459,7 @@ SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
iov[1].iov_len = uni_path_len;
iov[1].iov_base = path;
- if (!server->oplocks)
+ if ((!server->oplocks) || (tcon->no_lease))
*oplock = SMB2_OPLOCK_LEVEL_NONE;
if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||