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cifs: return a single-use cfid if we did not get a lease 

commit 8e843bf38f upstream.

If we did not get a lease we can still return a single use cfid to the caller.
The cfid will not have has_lease set and will thus not be shared with any
other concurrent users and will be freed immediately when the caller
drops the handle.

This avoids extra roundtrips for servers that do not support directory leases
where they would first fail to get a cfid with a lease and then fallback
to try a normal SMB2_open()

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ronnie Sahlberg 2023-02-17 13:35:01 +10:00 committed by Greg Kroah-Hartman
parent c992b699b9
commit f5a6d69857
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/cifs/cached_dir.c
View File

@ -14,6 +14,7 @@
static struct cached_fid *init_cached_dir(const char *path);
static void free_cached_dir(struct cached_fid *cfid);
static void smb2_close_cached_fid(struct kref *ref);
static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids,
const char *path,
@ -221,6 +222,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
}
goto oshr_free;
}
cfid->tcon = tcon;
cfid->is_open = true;
o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
@ -233,7 +235,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
if (o_rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
goto oshr_free;
smb2_parse_contexts(server, o_rsp,
&oparms.fid->epoch,
oparms.fid->lease_key, &oplock,
@ -260,7 +261,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
}
}
cfid->dentry = dentry;
cfid->tcon = tcon;
cfid->time = jiffies;
cfid->has_lease = true;
@ -271,7 +271,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
spin_lock(&cfids->cfid_list_lock);
if (!cfid->has_lease) {
if (rc && !cfid->has_lease) {
if (cfid->on_list) {
list_del(&cfid->entry);
cfid->on_list = false;
@ -280,6 +280,15 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
rc = -ENOENT;
}
spin_unlock(&cfids->cfid_list_lock);
if (!rc && !cfid->has_lease) {
/*
* We are guaranteed to have two references at this point.
* One for the caller and one for a potential lease.
* Release the Lease-ref so that the directory will be closed
* when the caller closes the cached handle.
*/
kref_put(&cfid->refcount, smb2_close_cached_fid);
}
if (rc) {
if (cfid->is_open)
SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
@ -340,6 +349,7 @@ smb2_close_cached_fid(struct kref *ref)
if (cfid->is_open) {
SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
cfid->fid.volatile_fid);
atomic_dec(&cfid->tcon->num_remote_opens);
}
free_cached_dir(cfid);