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dm io: handle empty barriers 

Accept empty barriers in dm-io.

dm-io will process empty write barrier requests just like the other
read/write requests.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-12-10 23:52:22 +00:00 committed by Alasdair G Kergon
parent 67a46dad25
commit 12fc0f49dc
1 changed files with 7 additions and 3 deletions
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10
drivers/md/dm-io.c
View File

@ -309,7 +309,11 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
unsigned num_bvecs;
sector_t remaining = where->count;
while (remaining) {
/*
* where->count may be zero if rw holds a write barrier and we
* need to send a zero-sized barrier.
*/
do {
/*
* Allocate a suitably sized-bio.
*/
@ -339,7 +343,7 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
atomic_inc(&io->count);
submit_bio(rw, bio);
}
} while (remaining);
}
static void dispatch_io(int rw, unsigned int num_regions,
@ -360,7 +364,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
*/
for (i = 0; i < num_regions; i++) {
*dp = old_pages;
if (where[i].count)
if (where[i].count || (rw & (1 << BIO_RW_BARRIER)))
do_region(rw, i, where + i, dp, io);
}