static int cifs_oplock_thread(void * dummyarg)
{
struct oplock_q_entry * oplock_item;
struct cifsTconInfo *pTcon;
struct inode * inode;
__u16 netfid;
int rc;
daemonize("cifsoplockd");
allow_signal(SIGTERM);
oplockThread = current;
do {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(1*HZ);
spin_lock(&GlobalMid_Lock);
if(list_empty(&GlobalOplock_Q)) {
spin_unlock(&GlobalMid_Lock);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(39*HZ);
} else {
oplock_item = list_entry(GlobalOplock_Q.next,
struct oplock_q_entry, qhead);
if(oplock_item) {
cFYI(1,("found oplock item to write out"));
pTcon = oplock_item->tcon;
inode = oplock_item->pinode;
netfid = oplock_item->netfid;
spin_unlock(&GlobalMid_Lock);
DeleteOplockQEntry(oplock_item);
/* can not grab inode sem here since it would
deadlock when oplock received on delete
since vfs_unlink holds the i_sem across
the call */
/* down(&inode->i_sem);*/
if (S_ISREG(inode->i_mode)) {
rc = filemap_fdatawrite(inode->i_mapping);
if(CIFS_I(inode)->clientCanCacheRead == 0) {
filemap_fdatawait(inode->i_mapping);
invalidate_remote_inode(inode);
}
} else
rc = 0;
/* up(&inode->i_sem);*/
if (rc)
CIFS_I(inode)->write_behind_rc = rc;
cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
/* releasing a stale oplock after recent reconnection
of smb session using a now incorrect file
handle is not a data integrity issue but do
not bother sending an oplock release if session
to server still is disconnected since oplock
already released by the server in that case */
if(pTcon->tidStatus != CifsNeedReconnect) {
rc = CIFSSMBLock(0, pTcon, netfid,
0 /* len */ , 0 /* offset */, 0,
0, LOCKING_ANDX_OPLOCK_RELEASE,
0 /* wait flag */);
cFYI(1,("Oplock release rc = %d ",rc));
}
} else
spin_unlock(&GlobalMid_Lock);
}
} while(!signal_pending(current));
complete_and_exit (&cifs_oplock_exited, 0);
oplockThread = NULL;
}
static int cifs_oplock_thread(void *dummyarg)
{
struct oplock_q_entry *oplock_item;
struct cifsTconInfo *pTcon;
struct inode *inode;
__u16 netfid;
int rc, waitrc = 0;
set_freezable();
do {
if (try_to_freeze())
continue;
spin_lock(&GlobalMid_Lock);
if (list_empty(&GlobalOplock_Q)) {
spin_unlock(&GlobalMid_Lock);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(39*HZ);
} else {
oplock_item = list_entry(GlobalOplock_Q.next,
struct oplock_q_entry, qhead);
cFYI(1, ("found oplock item to write out"));
pTcon = oplock_item->tcon;
inode = oplock_item->pinode;
netfid = oplock_item->netfid;
spin_unlock(&GlobalMid_Lock);
DeleteOplockQEntry(oplock_item);
/* can not grab inode sem here since it would
deadlock when oplock received on delete
since vfs_unlink holds the i_mutex across
the call */
/* mutex_lock(&inode->i_mutex);*/
if (S_ISREG(inode->i_mode)) {
#ifdef CONFIG_CIFS_EXPERIMENTAL
if (CIFS_I(inode)->clientCanCacheAll == 0)
break_lease(inode, FMODE_READ);
else if (CIFS_I(inode)->clientCanCacheRead == 0)
break_lease(inode, FMODE_WRITE);
#endif
rc = filemap_fdatawrite(inode->i_mapping);
if (CIFS_I(inode)->clientCanCacheRead == 0) {
waitrc = filemap_fdatawait(
inode->i_mapping);
invalidate_remote_inode(inode);
}
if (rc == 0)
rc = waitrc;
} else
rc = 0;
/* mutex_unlock(&inode->i_mutex);*/
if (rc)
CIFS_I(inode)->write_behind_rc = rc;
cFYI(1, ("Oplock flush inode %p rc %d",
inode, rc));
/* releasing stale oplock after recent reconnect
of smb session using a now incorrect file
handle is not a data integrity issue but do
not bother sending an oplock release if session
to server still is disconnected since oplock
already released by the server in that case */
if (!pTcon->need_reconnect) {
rc = CIFSSMBLock(0, pTcon, netfid,
0 /* len */ , 0 /* offset */, 0,
0, LOCKING_ANDX_OPLOCK_RELEASE,
false /* wait flag */);
cFYI(1, ("Oplock release rc = %d", rc));
}
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(1); /* yield in case q were corrupt */
}
} while (!kthread_should_stop());
return 0;
}
