diff options
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
| -rw-r--r-- | drivers/md/dm-snap-persistent.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 808b8419bc48..aeacad9be51d 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -7,6 +7,7 @@ #include "dm-exception-store.h" +#include <linux/ctype.h> #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/vmalloc.h> @@ -533,7 +534,7 @@ static int read_exceptions(struct pstore *ps, chunk = area_location(ps, ps->current_area); area = dm_bufio_read(client, chunk, &bp); - if (unlikely(IS_ERR(area))) { + if (IS_ERR(area)) { r = PTR_ERR(area); goto ret_destroy_bufio; } @@ -843,8 +844,7 @@ static void persistent_drop_snapshot(struct dm_exception_store *store) DMWARN("write header failed"); } -static int persistent_ctr(struct dm_exception_store *store, - unsigned argc, char **argv) +static int persistent_ctr(struct dm_exception_store *store, char *options) { struct pstore *ps; @@ -873,6 +873,16 @@ static int persistent_ctr(struct dm_exception_store *store, return -ENOMEM; } + if (options) { + char overflow = toupper(options[0]); + if (overflow == 'O') + store->userspace_supports_overflow = true; + else { + DMERR("Unsupported persistent store option: %s", options); + return -EINVAL; + } + } + store->context = ps; return 0; @@ -888,7 +898,8 @@ static unsigned persistent_status(struct dm_exception_store *store, case STATUSTYPE_INFO: break; case STATUSTYPE_TABLE: - DMEMIT(" P %llu", (unsigned long long)store->chunk_size); + DMEMIT(" %s %llu", store->userspace_supports_overflow ? "PO" : "P", + (unsigned long long)store->chunk_size); } return sz; |