From cda89700fc54c391bfca23cbb0c68224ae3f576f Mon Sep 17 00:00:00 2001
From: Krutika Dhananjay <kdhananj@redhat.com>
Date: Tue, 29 Mar 2016 18:36:08 +0530
Subject: [PATCH 76/80] features/shard: Make o-direct writes work with sharding
Backport of: http://review.gluster.org/#/c/13846/
release-3.7 patch: http://review.gluster.org/#/c/13966/
With files opened with o-direct, the expectation is that
the IO performed on the fds is byte aligned wrt the sector size
of the underlying device. With files getting sharded, a single
write from the application could be broken into more than one write
falling on different shards which _might_ cause the original byte alignment
property to be lost. To get around this, shard translator will send fsync
on odirect writes to emulate o-direct-like behavior in the backend.
Change-Id: Ic0291cfca16902b9c35a123eb5f4f46924a09395
BUG: 1314421
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/71872
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
---
xlators/features/shard/src/shard.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/xlators/features/shard/src/shard.c b/xlators/features/shard/src/shard.c
index c7a57e0..78bb82d 100644
--- a/xlators/features/shard/src/shard.c
+++ b/xlators/features/shard/src/shard.c
@@ -3591,6 +3591,7 @@ shard_common_inode_write_do (call_frame_t *frame, xlator_t *this)
shard_local_t *local = NULL;
struct iovec *vec = NULL;
gf_boolean_t wind_failed = _gf_false;
+ gf_boolean_t odirect = _gf_false;
off_t orig_offset = 0;
off_t shard_offset = 0;
off_t vec_offset = 0;
@@ -3621,6 +3622,9 @@ shard_common_inode_write_do (call_frame_t *frame, xlator_t *this)
return 0;
}
+ if ((fd->flags & O_DIRECT) && (local->fop == GF_FOP_WRITE))
+ odirect = _gf_true;
+
while (cur_block <= last_block) {
if (wind_failed) {
shard_common_inode_write_do_cbk (frame,
@@ -3678,6 +3682,8 @@ shard_common_inode_write_do (call_frame_t *frame, xlator_t *this)
NULL, NULL);
goto next;
}
+ if (odirect)
+ local->flags |= O_SYNC;
}
shard_common_inode_write_wind (frame, this, anon_fd,
--
1.7.1