diff options
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
| -rw-r--r-- | drivers/md/dm-snap-persistent.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index bf71583296f7..117a05e40090 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> @@ -843,10 +844,10 @@ 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; + int r; /* allocate the pstore */ ps = kzalloc(sizeof(*ps), GFP_KERNEL); @@ -868,14 +869,32 @@ static int persistent_ctr(struct dm_exception_store *store, ps->metadata_wq = alloc_workqueue("ksnaphd", WQ_MEM_RECLAIM, 0); if (!ps->metadata_wq) { - kfree(ps); DMERR("couldn't start header metadata update thread"); - return -ENOMEM; + r = -ENOMEM; + goto err_workqueue; + } + + if (options) { + char overflow = toupper(options[0]); + if (overflow == 'O') + store->userspace_supports_overflow = true; + else { + DMERR("Unsupported persistent store option: %s", options); + r = -EINVAL; + goto err_options; + } } store->context = ps; return 0; + +err_options: + destroy_workqueue(ps->metadata_wq); +err_workqueue: + kfree(ps); + + return r; } static unsigned persistent_status(struct dm_exception_store *store, @@ -888,7 +907,8 @@ 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; |