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cifs: convert cifs_tcp_ses_lock from a rwlock to a spinlock

Telusuri Sumber 
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>
This commit is contained in:
Suresh Jayaraman
2010-10-18 23:29:37 +05:30
committed by Steve French
orang tua 3e24e13287
melakukan 3f9bcca782
7 mengubah file dengan 58 tambahan dan 58 penghapusan
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8
fs/cifs/cifsfs.c
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@@ -482,16 +482,16 @@ static void cifs_umount_begin(struct super_block *sb)
tcon = cifs_sb_master_tcon(cifs_sb);
read_lock(&cifs_tcp_ses_lock);
spin_lock(&cifs_tcp_ses_lock);
if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
/* we have other mounts to same share or we have
already tried to force umount this and woken up
all waiting network requests, nothing to do */
read_unlock(&cifs_tcp_ses_lock);
spin_unlock(&cifs_tcp_ses_lock);
return;
} else if (tcon->tc_count == 1)
tcon->tidStatus = CifsExiting;
read_unlock(&cifs_tcp_ses_lock);
spin_unlock(&cifs_tcp_ses_lock);
/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
/* cancel_notify_requests(tcon); */
@@ -940,7 +940,7 @@ init_cifs(void)
GlobalTotalActiveXid = 0;
GlobalMaxActiveXid = 0;
memset(Local_System_Name, 0, 15);
rwlock_init(&cifs_tcp_ses_lock);
spin_lock_init(&cifs_tcp_ses_lock);
spin_lock_init(&cifs_file_list_lock);
spin_lock_init(&GlobalMid_Lock);