cifs: simplify refcounting for oplock breaks

Currently, we take a sb->s_active reference and a cifsFileInfo reference
when an oplock break workqueue job is queued. This is unnecessary and
more complicated than it needs to be. Also as Al points out,
deactivate_super has non-trivial locking implications so it's best to
avoid that if we can.

Instead, just cancel any pending oplock breaks for this filehandle
synchronously in cifsFileInfo_put after taking it off the lists.
That should ensure that this job doesn't outlive the structures it
depends on.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 8655174..212e562 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -86,24 +86,6 @@ extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
 extern mempool_t *cifs_mid_poolp;
 
-void
-cifs_sb_active(struct super_block *sb)
-{
-       struct cifs_sb_info *server = CIFS_SB(sb);
-
-       if (atomic_inc_return(&server->active) == 1)
-               atomic_inc(&sb->s_active);
-}
-
-void
-cifs_sb_deactive(struct super_block *sb)
-{
-       struct cifs_sb_info *server = CIFS_SB(sb);
-
-       if (atomic_dec_and_test(&server->active))
-               deactivate_super(sb);
-}
-
 static int
 cifs_read_super(struct super_block *sb)
 {

diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index fbd050c..cb71dc1 100644 (file)
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -41,10 +41,6 @@ extern struct file_system_type cifs_fs_type;
 extern const struct address_space_operations cifs_addr_ops;
 extern const struct address_space_operations cifs_addr_ops_smallbuf;
 
-/* Functions related to super block operations */
-extern void cifs_sb_active(struct super_block *sb);
-extern void cifs_sb_deactive(struct super_block *sb);
-
 /* Functions related to inodes */
 extern const struct inode_operations cifs_dir_inode_ops;
 extern struct inode *cifs_root_iget(struct super_block *);

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 1fcf4e5..38ce6d4 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -942,8 +942,6 @@ GLOBAL_EXTERN spinlock_t siduidlock;
 GLOBAL_EXTERN spinlock_t sidgidlock;
 
 void cifs_oplock_break(struct work_struct *work);
-void cifs_oplock_break_get(struct cifsFileInfo *cfile);
-void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 
 extern const struct slow_work_ops cifs_oplock_break_ops;
 

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 378acda..9f41a10 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -314,6 +314,8 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
        }
        spin_unlock(&cifs_file_list_lock);
 
+       cancel_work_sync(&cifs_file->oplock_break);
+
        if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
                int xid, rc;
 
@@ -2418,31 +2420,6 @@ void cifs_oplock_break(struct work_struct *work)
                                 cinode->clientCanCacheRead ? 1 : 0);
                cFYI(1, "Oplock release rc = %d", rc);
        }
-
-       /*
-        * We might have kicked in before is_valid_oplock_break()
-        * finished grabbing reference for us.  Make sure it's done by
-        * waiting for cifs_file_list_lock.
-        */
-       spin_lock(&cifs_file_list_lock);
-       spin_unlock(&cifs_file_list_lock);
-
-       cifs_oplock_break_put(cfile);
-}
-
-/* must be called while holding cifs_file_list_lock */
-void cifs_oplock_break_get(struct cifsFileInfo *cfile)
-{
-       cifs_sb_active(cfile->dentry->d_sb);
-       cifsFileInfo_get(cfile);
-}
-
-void cifs_oplock_break_put(struct cifsFileInfo *cfile)
-{
-       struct super_block *sb = cfile->dentry->d_sb;
-
-       cifsFileInfo_put(cfile);
-       cifs_sb_deactive(sb);
 }
 
 const struct address_space_operations cifs_addr_ops = {

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 03a1f49..7c16933 100644 (file)
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -585,15 +585,8 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
 
                                cifs_set_oplock_level(pCifsInode,
                                        pSMB->OplockLevel ? OPLOCK_READ : 0);
-                               /*
-                                * cifs_oplock_break_put() can't be called
-                                * from here.  Get reference after queueing
-                                * succeeded.  cifs_oplock_break() will
-                                * synchronize using cifs_file_list_lock.
-                                */
-                               if (queue_work(system_nrt_wq,
-                                              &netfile->oplock_break))
-                                       cifs_oplock_break_get(netfile);
+                               queue_work(system_nrt_wq,
+                                          &netfile->oplock_break);
                                netfile->oplock_break_cancelled = false;
 
                                spin_unlock(&cifs_file_list_lock);