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| author | Suresh Jayaraman <sjayaraman@suse.de> | 2010-10-18 23:29:37 +0530 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2010-10-21 13:14:27 +0000 |
| commit | 3f9bcca7820a6711307b6499952b13cfcfc31dd6 (patch) | |
| tree | 6c380f5877562778335d6794e1e4a297f8970d77 /fs/cifs/sess.c | |
| parent | 3e24e132878c83910b61eb7704511a6d96a0389f (diff) | |
| download | linux-3.10-3f9bcca7820a6711307b6499952b13cfcfc31dd6.tar.gz linux-3.10-3f9bcca7820a6711307b6499952b13cfcfc31dd6.tar.bz2 linux-3.10-3f9bcca7820a6711307b6499952b13cfcfc31dd6.zip | |
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/sess.c')
| -rw-r--r-- | fs/cifs/sess.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index e35dc60d325..2a11efd9659 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -80,7 +80,7 @@ static __le16 get_next_vcnum(struct cifsSesInfo *ses) if (max_vcs < 2) max_vcs = 0xFFFF; - write_lock(&cifs_tcp_ses_lock); + spin_lock(&cifs_tcp_ses_lock); if ((ses->need_reconnect) && is_first_ses_reconnect(ses)) goto get_vc_num_exit; /* vcnum will be zero */ for (i = ses->server->srv_count - 1; i < max_vcs; i++) { @@ -112,7 +112,7 @@ static __le16 get_next_vcnum(struct cifsSesInfo *ses) vcnum = i; ses->vcnum = vcnum; get_vc_num_exit: - write_unlock(&cifs_tcp_ses_lock); + spin_unlock(&cifs_tcp_ses_lock); return cpu_to_le16(vcnum); } |