Merge tag '6.10-rc6-smb3-client-fix' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fix from Steve French:
 "Fix for smb3 readahead performance regression"

* tag '6.10-rc6-smb3-client-fix' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Fix read-performance regression by dropping readahead expansion

Author: torvalds

fs/smb/client/file.c

@@ -245,35 +245,6 @@ static int cifs_init_request(struct netfs_io_request *rreq, struct file *file)
 	return 0;
 }
 
-/*
- * Expand the size of a readahead to the size of the rsize, if at least as
- * large as a page, allowing for the possibility that rsize is not pow-2
- * aligned.
- */
-static void cifs_expand_readahead(struct netfs_io_request *rreq)
-{
-	unsigned int rsize = rreq->rsize;
-	loff_t misalignment, i_size = i_size_read(rreq->inode);
-
-	if (rsize < PAGE_SIZE)
-		return;
-
-	if (rsize < INT_MAX)
-		rsize = roundup_pow_of_two(rsize);
-	else
-		rsize = ((unsigned int)INT_MAX + 1) / 2;
-
-	misalignment = rreq->start & (rsize - 1);
-	if (misalignment) {
-		rreq->start -= misalignment;
-		rreq->len += misalignment;
-	}
-
-	rreq->len = round_up(rreq->len, rsize);
-	if (rreq->start < i_size && rreq->len > i_size - rreq->start)
-		rreq->len = i_size - rreq->start;
-}
-
 /*
  * Completion of a request operation.
  */
@@ -329,7 +300,6 @@ const struct netfs_request_ops cifs_req_ops = {
 	.init_request		= cifs_init_request,
 	.free_request		= cifs_free_request,
 	.free_subrequest	= cifs_free_subrequest,
-	.expand_readahead	= cifs_expand_readahead,
 	.clamp_length		= cifs_clamp_length,
 	.issue_read		= cifs_req_issue_read,
 	.done			= cifs_rreq_done,