From: Jinshan Xiong <jinshan.xiong@intel.com>
Date: Wed, 9 Aug 2017 23:31:17 +0000 (-0700)
Subject: LU-9841 lov: do not split IO for single striped file
X-Git-Tag: 2.10.53~68
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=078a099d26ef7f5d26131c0e18615855a39f341d

LU-9841 lov: do not split IO for single striped file

stripe size for single striped file is not reliable, it shouldn't
be used to split I/O.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I47c31d59b46b07d4a6760b8985e1c19da4765a5c
Reviewed-on: https://review.whamcloud.com/28451
Tested-by: Jenkins
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
---

diff --git a/lustre/lov/lov_io.c b/lustre/lov/lov_io.c
index 2339ea5..f40dfa2 100644
--- a/lustre/lov/lov_io.c
+++ b/lustre/lov/lov_io.c
@@ -485,7 +485,6 @@ static int lov_io_rw_iter_init(const struct lu_env *env,
 	struct cl_io_range *range = &io->u.ci_rw.rw_range;
 	loff_t start = range->cir_pos;
 	loff_t next;
-	unsigned long ssize;
 	int index;
 
 	LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
@@ -511,11 +510,15 @@ static int lov_io_rw_iter_init(const struct lu_env *env,
 
 	lse = lov_lse(lio->lis_object, index);
 
-	ssize = lse->lsme_stripe_size;
-	lov_do_div64(start, ssize);
-	next = (start + 1) * ssize;
-	if (next <= start * ssize)
-		next = ~0ull;
+	next = MAX_LFS_FILESIZE;
+	if (lse->lsme_stripe_count > 1) {
+		unsigned long ssize = lse->lsme_stripe_size;
+
+		lov_do_div64(start, ssize);
+		next = (start + 1) * ssize;
+		if (next <= start * ssize)
+			next = MAX_LFS_FILESIZE;
+	}
 
 	LASSERTF(range->cir_pos >= lse->lsme_extent.e_start,
 		 "pos %lld, [%lld, %lld)\n", range->cir_pos,