[PATCH] ceph: fix alignment of rasize

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Fix improper rasize alignment.

Based on code, rasize(max readahead) actually aligns to PAGESIZE not
1024 which is documented in below link, should fix the document as well.

docs.ceph.com/docs/master/man/8/mount.ceph/

Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
---
 fs/ceph/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index b33082e6878f..465861959a6b 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -268,7 +268,7 @@ static int parse_fsopt_token(char *c, void *private)
 	case Opt_rasize:
 		if (intval < 0)
 			return -EINVAL;
-		fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
+		fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 		break;
 	case Opt_caps_wanted_delay_min:
 		if (intval < 1)
-- 
2.17.0

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