diff options
| -rw-r--r-- | drivers/md/dm-table.c | 87 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 5 |
2 files changed, 51 insertions, 41 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 47412ae98fb9..4920998efeeb 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -522,56 +522,61 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti, return 0; } - -int dm_get_device(struct dm_target *ti, const char *path, sector_t start, - sector_t len, int mode, struct dm_dev **result) +void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev) { - int r = __table_get_device(ti->table, ti, path, - start, len, mode, result); - if (!r) { - request_queue_t *q = bdev_get_queue((*result)->bdev); - struct io_restrictions *rs = &ti->limits; - - /* - * Combine the device limits low. - * - * FIXME: if we move an io_restriction struct - * into q this would just be a call to - * combine_restrictions_low() - */ + request_queue_t *q = bdev_get_queue(bdev); + struct io_restrictions *rs = &ti->limits; + + /* + * Combine the device limits low. + * + * FIXME: if we move an io_restriction struct + * into q this would just be a call to + * combine_restrictions_low() + */ + rs->max_sectors = + min_not_zero(rs->max_sectors, q->max_sectors); + + /* FIXME: Device-Mapper on top of RAID-0 breaks because DM + * currently doesn't honor MD's merge_bvec_fn routine. + * In this case, we'll force DM to use PAGE_SIZE or + * smaller I/O, just to be safe. A better fix is in the + * works, but add this for the time being so it will at + * least operate correctly. + */ + if (q->merge_bvec_fn) rs->max_sectors = - min_not_zero(rs->max_sectors, q->max_sectors); + min_not_zero(rs->max_sectors, + (unsigned int) (PAGE_SIZE >> 9)); - /* FIXME: Device-Mapper on top of RAID-0 breaks because DM - * currently doesn't honor MD's merge_bvec_fn routine. - * In this case, we'll force DM to use PAGE_SIZE or - * smaller I/O, just to be safe. A better fix is in the - * works, but add this for the time being so it will at - * least operate correctly. - */ - if (q->merge_bvec_fn) - rs->max_sectors = - min_not_zero(rs->max_sectors, - (unsigned int) (PAGE_SIZE >> 9)); + rs->max_phys_segments = + min_not_zero(rs->max_phys_segments, + q->max_phys_segments); - rs->max_phys_segments = - min_not_zero(rs->max_phys_segments, - q->max_phys_segments); + rs->max_hw_segments = + min_not_zero(rs->max_hw_segments, q->max_hw_segments); - rs->max_hw_segments = - min_not_zero(rs->max_hw_segments, q->max_hw_segments); + rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size); - rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size); + rs->max_segment_size = + min_not_zero(rs->max_segment_size, q->max_segment_size); - rs->max_segment_size = - min_not_zero(rs->max_segment_size, q->max_segment_size); + rs->seg_boundary_mask = + min_not_zero(rs->seg_boundary_mask, + q->seg_boundary_mask); - rs->seg_boundary_mask = - min_not_zero(rs->seg_boundary_mask, - q->seg_boundary_mask); + rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); +} +EXPORT_SYMBOL_GPL(dm_set_device_limits); - rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); - } +int dm_get_device(struct dm_target *ti, const char *path, sector_t start, + sector_t len, int mode, struct dm_dev **result) +{ + int r = __table_get_device(ti->table, ti, path, + start, len, mode, result); + + if (!r) + dm_set_device_limits(ti, (*result)->bdev); return r; } diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 8cbc46b8e3db..7a48d428d0a1 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -72,6 +72,11 @@ typedef int (*dm_ioctl_fn) (struct dm_target *ti, struct inode *inode, void dm_error(const char *message); /* + * Combine device limits. + */ +void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev); + +/* * Constructors should call these functions to ensure destination devices * are opened/closed correctly. * FIXME: too many arguments. |