diff options
Diffstat (limited to 'drivers/md/dm-table.c')
| -rw-r--r-- | drivers/md/dm-table.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index caaee8032afe..52e049554f5c 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -163,10 +163,8 @@ static int alloc_targets(struct dm_table *t, unsigned int num) /* * Allocate both the target array and offset array at once. - * Append an empty entry to catch sectors beyond the end of - * the device. */ - n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) + + n_highs = (sector_t *) dm_vcalloc(num, sizeof(struct dm_target) + sizeof(sector_t)); if (!n_highs) return -ENOMEM; @@ -882,23 +880,23 @@ EXPORT_SYMBOL_GPL(dm_table_set_type); /* validate the dax capability of the target device span */ int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, - sector_t start, sector_t len, void *data) + sector_t start, sector_t len, void *data) { int blocksize = *(int *) data; return generic_fsdax_supported(dev->dax_dev, dev->bdev, blocksize, - start, len); + start, len); } /* Check devices support synchronous DAX */ -static int device_synchronous(struct dm_target *ti, struct dm_dev *dev, - sector_t start, sector_t len, void *data) +static int device_dax_synchronous(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) { - return dax_synchronous(dev->dax_dev); + return dev->dax_dev && dax_synchronous(dev->dax_dev); } bool dm_table_supports_dax(struct dm_table *t, - iterate_devices_callout_fn iterate_fn, int *blocksize) + iterate_devices_callout_fn iterate_fn, int *blocksize) { struct dm_target *ti; unsigned i; @@ -911,7 +909,7 @@ bool dm_table_supports_dax(struct dm_table *t, return false; if (!ti->type->iterate_devices || - !ti->type->iterate_devices(ti, iterate_fn, blocksize)) + !ti->type->iterate_devices(ti, iterate_fn, blocksize)) return false; } @@ -1342,7 +1340,7 @@ void dm_table_event(struct dm_table *t) } EXPORT_SYMBOL(dm_table_event); -sector_t dm_table_get_size(struct dm_table *t) +inline sector_t dm_table_get_size(struct dm_table *t) { return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0; } @@ -1359,7 +1357,7 @@ struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) /* * Search the btree for the correct target. * - * Caller should check returned pointer with dm_target_is_valid() + * Caller should check returned pointer for NULL * to trap I/O beyond end of device. */ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) @@ -1367,6 +1365,9 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) unsigned int l, n = 0, k = 0; sector_t *node; + if (unlikely(sector >= dm_table_get_size(t))) + return NULL; + for (l = 0; l < t->depth; l++) { n = get_child(n, k); node = get_node(t, l, n); @@ -1921,7 +1922,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, if (dm_table_supports_dax(t, device_supports_dax, &page_size)) { blk_queue_flag_set(QUEUE_FLAG_DAX, q); - if (dm_table_supports_dax(t, device_synchronous, NULL)) + if (dm_table_supports_dax(t, device_dax_synchronous, NULL)) set_dax_synchronous(t->md->dax_dev); } else |
