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dm: always allow one page in dm_merge_bvec 

Some callers assume they can always add at least one page to an empty bio,
so dm_merge_bvec should not return 0 in this case: we'll reject the I/O
later after the bio is submitted.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2008-10-01 14:39:17 +01:00 committed by Alasdair G Kergon
parent d3a47e82b6
commit 5037108acd
1 changed files with 5 additions and 4 deletions
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9
drivers/md/dm.c
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@ -837,10 +837,10 @@ static int dm_merge_bvec(struct request_queue *q,
struct dm_table *map = dm_get_table(md);
struct dm_target *ti;
sector_t max_sectors;
int max_size;
int max_size = 0;
if (unlikely(!map))
return 0;
goto out;
ti = dm_table_find_target(map, bvm->bi_sector);
@ -861,14 +861,15 @@ static int dm_merge_bvec(struct request_queue *q,
if (max_size && ti->type->merge)
max_size = ti->type->merge(ti, bvm, biovec, max_size);
dm_table_put(map);
out:
/*
* Always allow an entire first page
*/
if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT))
max_size = biovec->bv_len;
dm_table_put(map);
return max_size;
}