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CIFS: Make cifs_push_locks send as many locks at once as possible

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that reduces a traffic and increases a performance.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2011-10-22 15:33:32 +04:00 committed by Steve French
parent 9ee305b70e
commit 32b9aaf1a5
1 changed files with 43 additions and 6 deletions
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49
fs/cifs/file.c
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@ -829,6 +829,11 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
struct cifsLockInfo *li, *tmp;
struct cifs_tcon *tcon;
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
unsigned int num, max_num;
LOCKING_ANDX_RANGE *buf, *cur;
int types[] = {LOCKING_ANDX_LARGE_FILES,
LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
int i;
xid = GetXid();
tcon = tlink_tcon(cfile->tlink);
@ -840,17 +845,49 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
return rc;
}
list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
stored_rc = CIFSSMBLock(xid, tcon, cfile->netfid,
li->pid, li->length, li->offset,
0, 1, li->type, 0, 0);
if (stored_rc)
rc = stored_rc;
max_num = (tcon->ses->server->maxBuf - sizeof(struct smb_hdr)) /
sizeof(LOCKING_ANDX_RANGE);
buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
if (!buf) {
mutex_unlock(&cinode->lock_mutex);
FreeXid(xid);
return rc;
}
for (i = 0; i < 2; i++) {
cur = buf;
num = 0;
list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
if (li->type != types[i])
continue;
cur->Pid = cpu_to_le16(li->pid);
cur->LengthLow = cpu_to_le32((u32)li->length);
cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
cur->OffsetLow = cpu_to_le32((u32)li->offset);
cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
if (++num == max_num) {
stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
li->type, 0, num, buf);
if (stored_rc)
rc = stored_rc;
cur = buf;
num = 0;
} else
cur++;
}
if (num) {
stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
types[i], 0, num, buf);
if (stored_rc)
rc = stored_rc;
}
}
cinode->can_cache_brlcks = false;
mutex_unlock(&cinode->lock_mutex);
kfree(buf);
FreeXid(xid);
return rc;
}