From: Mikulas Patocka mpatocka@redhat.com
commit 31b22120194b5c0d460f59e0c98504de1d3f1f14 upstream.
The dm-writecache reads metadata in the target constructor. However, when we reload the target, there could be another active instance running on the same device. This is the sequence of operations when doing a reload:
1. construct new target 2. suspend old target 3. resume new target 4. destroy old target
Metadata that were written by the old target between steps 1 and 2 would not be visible by the new target.
Fix the data corruption by loading the metadata in the resume handler.
Also, validate block_size is at least as large as both the devices' logical block size and only read 1 block from the metadata during target constructor -- no need to read entirety of metadata now that it is done during resume.
Fixes: 48debafe4f2f ("dm: add writecache target") Cc: stable@vger.kernel.org # v4.18+ Signed-off-by: Mikulas Patocka mpatocka@redhat.com Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/dm-writecache.c | 52 ++++++++++++++++++++++++++++++++------------- 1 file changed, 37 insertions(+), 15 deletions(-)
--- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -878,6 +878,24 @@ static int writecache_alloc_entries(stru return 0; }
+static int writecache_read_metadata(struct dm_writecache *wc, sector_t n_sectors) +{ + struct dm_io_region region; + struct dm_io_request req; + + region.bdev = wc->ssd_dev->bdev; + region.sector = wc->start_sector; + region.count = n_sectors; + req.bi_op = REQ_OP_READ; + req.bi_op_flags = REQ_SYNC; + req.mem.type = DM_IO_VMA; + req.mem.ptr.vma = (char *)wc->memory_map; + req.client = wc->dm_io; + req.notify.fn = NULL; + + return dm_io(&req, 1, ®ion, NULL); +} + static void writecache_resume(struct dm_target *ti) { struct dm_writecache *wc = ti->private; @@ -888,8 +906,18 @@ static void writecache_resume(struct dm_
wc_lock(wc);
- if (WC_MODE_PMEM(wc)) + if (WC_MODE_PMEM(wc)) { persistent_memory_invalidate_cache(wc->memory_map, wc->memory_map_size); + } else { + r = writecache_read_metadata(wc, wc->metadata_sectors); + if (r) { + size_t sb_entries_offset; + writecache_error(wc, r, "unable to read metadata: %d", r); + sb_entries_offset = offsetof(struct wc_memory_superblock, entries); + memset((char *)wc->memory_map + sb_entries_offset, -1, + (wc->metadata_sectors << SECTOR_SHIFT) - sb_entries_offset); + } + }
wc->tree = RB_ROOT; INIT_LIST_HEAD(&wc->lru); @@ -1984,6 +2012,12 @@ static int writecache_ctr(struct dm_targ ti->error = "Invalid block size"; goto bad; } + if (wc->block_size < bdev_logical_block_size(wc->dev->bdev) || + wc->block_size < bdev_logical_block_size(wc->ssd_dev->bdev)) { + r = -EINVAL; + ti->error = "Block size is smaller than device logical block size"; + goto bad; + } wc->block_size_bits = __ffs(wc->block_size);
wc->max_writeback_jobs = MAX_WRITEBACK_JOBS; @@ -2072,8 +2106,6 @@ invalid_optional: goto bad; } } else { - struct dm_io_region region; - struct dm_io_request req; size_t n_blocks, n_metadata_blocks; uint64_t n_bitmap_bits;
@@ -2130,19 +2162,9 @@ invalid_optional: goto bad; }
- region.bdev = wc->ssd_dev->bdev; - region.sector = wc->start_sector; - region.count = wc->metadata_sectors; - req.bi_op = REQ_OP_READ; - req.bi_op_flags = REQ_SYNC; - req.mem.type = DM_IO_VMA; - req.mem.ptr.vma = (char *)wc->memory_map; - req.client = wc->dm_io; - req.notify.fn = NULL; - - r = dm_io(&req, 1, ®ion, NULL); + r = writecache_read_metadata(wc, wc->block_size >> SECTOR_SHIFT); if (r) { - ti->error = "Unable to read metadata"; + ti->error = "Unable to read first block of metadata"; goto bad; } }