diff options
Diffstat (limited to 'drivers/md/dm-log.c')
| -rw-r--r-- | drivers/md/dm-log.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c index a8c0fc79ca78..737961f275c1 100644 --- a/drivers/md/dm-log.c +++ b/drivers/md/dm-log.c @@ -326,8 +326,6 @@ static void header_from_disk(struct log_header *core, struct log_header *disk) static int rw_header(struct log_c *lc, int rw) { lc->io_req.bi_rw = rw; - lc->io_req.mem.ptr.vma = lc->disk_header; - lc->io_req.notify.fn = NULL; return dm_io(&lc->io_req, 1, &lc->header_location, NULL); } @@ -362,10 +360,15 @@ static int read_header(struct log_c *log) return 0; } -static inline int write_header(struct log_c *log) +static int _check_region_size(struct dm_target *ti, uint32_t region_size) { - header_to_disk(&log->header, log->disk_header); - return rw_header(log, WRITE); + if (region_size < 2 || region_size > ti->len) + return 0; + + if (!is_power_of_2(region_size)) + return 0; + + return 1; } /*---------------------------------------------------------------- @@ -403,8 +406,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, } } - if (sscanf(argv[0], "%u", ®ion_size) != 1) { - DMWARN("invalid region size string"); + if (sscanf(argv[0], "%u", ®ion_size) != 1 || + !_check_region_size(ti, region_size)) { + DMWARN("invalid region size %s", argv[0]); return -EINVAL; } @@ -453,8 +457,18 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, */ buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, ti->limits.hardsect_size); + + if (buf_size > dev->bdev->bd_inode->i_size) { + DMWARN("log device %s too small: need %llu bytes", + dev->name, (unsigned long long)buf_size); + kfree(lc); + return -EINVAL; + } + lc->header_location.count = buf_size >> SECTOR_SHIFT; + lc->io_req.mem.type = DM_IO_VMA; + lc->io_req.notify.fn = NULL; lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, PAGE_SIZE)); if (IS_ERR(lc->io_req.client)) { @@ -467,10 +481,12 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, lc->disk_header = vmalloc(buf_size); if (!lc->disk_header) { DMWARN("couldn't allocate disk log buffer"); + dm_io_client_destroy(lc->io_req.client); kfree(lc); return -ENOMEM; } + lc->io_req.mem.ptr.vma = lc->disk_header; lc->clean_bits = (void *)lc->disk_header + (LOG_OFFSET << SECTOR_SHIFT); } @@ -482,6 +498,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, DMWARN("couldn't allocate sync bitset"); if (!dev) vfree(lc->clean_bits); + else + dm_io_client_destroy(lc->io_req.client); vfree(lc->disk_header); kfree(lc); return -ENOMEM; @@ -495,6 +513,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, vfree(lc->sync_bits); if (!dev) vfree(lc->clean_bits); + else + dm_io_client_destroy(lc->io_req.client); vfree(lc->disk_header); kfree(lc); return -ENOMEM; @@ -631,8 +651,10 @@ static int disk_resume(struct dm_dirty_log *log) /* set the correct number of regions in the header */ lc->header.nr_regions = lc->region_count; + header_to_disk(&lc->header, lc->disk_header); + /* write the new header */ - r = write_header(lc); + r = rw_header(lc, WRITE); if (r) { DMWARN("%s: Failed to write header on dirty region log device", lc->log_dev->name); @@ -682,7 +704,7 @@ static int disk_flush(struct dm_dirty_log *log) if (!lc->touched) return 0; - r = write_header(lc); + r = rw_header(lc, WRITE); if (r) fail_log_device(lc); else |