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cifs: take read lock on GlobalSMBSes_lock in is_valid_oplock_break 

...rather than a write lock. It doesn't change the list so a read lock
should be sufficient.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2009-09-12 11:54:29 -04:00 committed by Steve French
parent 495e993745
commit 058daf4f67
1 changed files with 3 additions and 3 deletions
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6
fs/cifs/misc.c
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@ -562,14 +562,14 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
continue;
cifs_stats_inc(&tcon->num_oplock_brks);
write_lock(&GlobalSMBSeslock);
read_lock(&GlobalSMBSeslock);
list_for_each(tmp2, &tcon->openFileList) {
netfile = list_entry(tmp2, struct cifsFileInfo,
tlist);
if (pSMB->Fid != netfile->netfid)
continue;
write_unlock(&GlobalSMBSeslock);
read_unlock(&GlobalSMBSeslock);
read_unlock(&cifs_tcp_ses_lock);
cFYI(1, ("file id match, oplock break"));
pCifsInode = CIFS_I(netfile->pInode);
@ -584,7 +584,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
return true;
}
write_unlock(&GlobalSMBSeslock);
read_unlock(&GlobalSMBSeslock);
read_unlock(&cifs_tcp_ses_lock);
cFYI(1, ("No matching file for oplock break"));
return true;