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authorSuresh Jayaraman <sjayaraman@suse.de>2010-10-18 23:29:37 +0530
committerSteve French <sfrench@us.ibm.com>2010-10-21 13:14:27 +0000
commit3f9bcca7820a6711307b6499952b13cfcfc31dd6 (patch)
tree6c380f5877562778335d6794e1e4a297f8970d77 /fs/cifs/cifsglob.h
parent3e24e132878c83910b61eb7704511a6d96a0389f (diff)
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cifs: convert cifs_tcp_ses_lock from a rwlock to a spinlock
cifs_tcp_ses_lock is a rwlock with protects the cifs_tcp_ses_list, server->smb_ses_list and the ses->tcon_list. It also protects a few ref counters in server, ses and tcon. In most cases the critical section doesn't seem to be large, in a few cases where it is slightly large, there seem to be really no benefit from concurrent access. I briefly considered RCU mechanism but it appears to me that there is no real need. Replace it with a spinlock and get rid of the last rwlock in the cifs code. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
-rw-r--r--fs/cifs/cifsglob.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 18ee0ad..28337cb 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -703,7 +703,7 @@ GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
* the reference counters for the server, smb session, and tcon. Finally,
* changes to the tcon->tidStatus should be done while holding this lock.
*/
-GLOBAL_EXTERN rwlock_t cifs_tcp_ses_lock;
+GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
/*
* This lock protects the cifs_file->llist and cifs_file->flist