diff options
| author |   Ronnie Sahlberg <lsahlber@redhat.com> | 2018-07-31 08:48:22 +1000 |
|---|---|---|
| committer |   Steve French <stfrench@microsoft.com> | 2018-08-07 14:20:22 -0500 |
| commit | 9da6ec7775d2cd76df53fbf4f1f35f6d490204f5 (patch) | |
| tree | 4b94d5c7acde55bde6f42779a986c9de3268d513 /fs/cifs/smb2ops.c | |
| parent | smb3: add reconnect tracepoints (diff) | |
| download | linux-dev-9da6ec7775d2cd76df53fbf4f1f35f6d490204f5.tar.xz linux-dev-9da6ec7775d2cd76df53fbf4f1f35f6d490204f5.zip | |
cifs: use a refcount to protect open/closing the cached file handle
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs/smb2ops.c')
| -rw-r--r-- | fs/cifs/smb2ops.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 314556c083f3..8929426ddaa6 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -470,21 +470,36 @@ out: return rc; } -void -smb2_cached_lease_break(struct work_struct *work) +static void +smb2_close_cached_fid(struct kref *ref) { - struct cached_fid *cfid = container_of(work, - struct cached_fid, lease_break); - mutex_lock(&cfid->fid_mutex); + struct cached_fid *cfid = container_of(ref, struct cached_fid, + refcount); + if (cfid->is_valid) { cifs_dbg(FYI, "clear cached root file handle\n"); SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid, cfid->fid->volatile_fid); cfid->is_valid = false; } +} + +void close_shroot(struct cached_fid *cfid) +{ + mutex_lock(&cfid->fid_mutex); + kref_put(&cfid->refcount, smb2_close_cached_fid); mutex_unlock(&cfid->fid_mutex); } +void +smb2_cached_lease_break(struct work_struct *work) +{ + struct cached_fid *cfid = container_of(work, + struct cached_fid, lease_break); + + close_shroot(cfid); +} + /* * Open the directory at the root of a share */ @@ -499,6 +514,7 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid) if (tcon->crfid.is_valid) { cifs_dbg(FYI, "found a cached root file handle\n"); memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid)); + kref_get(&tcon->crfid.refcount); mutex_unlock(&tcon->crfid.fid_mutex); return 0; } @@ -515,6 +531,8 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid) memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid)); tcon->crfid.tcon = tcon; tcon->crfid.is_valid = true; + kref_init(&tcon->crfid.refcount); + kref_get(&tcon->crfid.refcount); } mutex_unlock(&tcon->crfid.fid_mutex); return rc; @@ -558,6 +576,9 @@ smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon) FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */ if (no_cached_open) SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); + else + close_shroot(&tcon->crfid); + return; } |