dm thin: set pool read-only if breaking_sharing fails block allocation

break_sharing() now handles an arbitrary alloc_data_block() error
the same way as provision_block(): marks pool read-only and errors the
cell.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index c151cbf..3aff1c2 100644 (file)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1086,6 +1086,7 @@ static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block,
 {
        int r;
        dm_block_t data_block;
+       struct pool *pool = tc->pool;
 
        r = alloc_data_block(tc, &data_block);
        switch (r) {
@@ -1095,13 +1096,14 @@ static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block,
                break;
 
        case -ENOSPC:
-               no_space(tc->pool, cell);
+               no_space(pool, cell);
                break;
 
        default:
                DMERR_LIMIT("%s: alloc_data_block() failed: error = %d",
                            __func__, r);
-               cell_error(tc->pool, cell);
+               set_pool_mode(pool, PM_READ_ONLY);
+               cell_error(pool, cell);
                break;
        }
 }