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Commit 65ee21eb authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-5.2/dm-fixes-2' of... 

Merge tag 'for-5.2/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix incorrect uses of kstrndup and DM logging macros in DM's early
   init code.

 - Fix DM log-writes target's handling of super block sectors so updates
   are made in order through use of completion.

 - Fix DM core's argument splitting code to avoid undefined behaviour
   reported as a side-effect of UBSAN analysis on ppc64le.

 - Fix DM verity target to limit the amount of error messages that can
   result from a corrupt block being found.

* tag 'for-5.2/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm verity: use message limit for data block corruption message
  dm table: don't copy from a NULL pointer in realloc_argv()
  dm log writes: make sure super sector log updates are written in order
  dm init: remove trailing newline from calls to DMERR() and DMINFO()
  dm init: fix incorrect uses of kstrndup()
parents 7a702b4e 2eba4e64

drivers/md/dm-init.c

+5 −5
Original line number Diff line number Diff line
@@ -140,8 +140,8 @@ static char __init *dm_parse_table_entry(struct dm_device *dev, char *str) 
		return ERR_PTR(-EINVAL);

	}

	/* target_args */

	dev->target_args_array[n] = kstrndup(field[3], GFP_KERNEL,

					     DM_MAX_STR_SIZE);

	dev->target_args_array[n] = kstrndup(field[3], DM_MAX_STR_SIZE,

					     GFP_KERNEL);

	if (!dev->target_args_array[n])

		return ERR_PTR(-ENOMEM);
@@ -272,10 +272,10 @@ static int __init dm_init_init(void) 
		return 0;



	if (strlen(create) >= DM_MAX_STR_SIZE) {

		DMERR("Argument is too big. Limit is %d\n", DM_MAX_STR_SIZE);

		DMERR("Argument is too big. Limit is %d", DM_MAX_STR_SIZE);

		return -EINVAL;

	}

	str = kstrndup(create, GFP_KERNEL, DM_MAX_STR_SIZE);

	str = kstrndup(create, DM_MAX_STR_SIZE, GFP_KERNEL);

	if (!str)

		return -ENOMEM;
@@ -283,7 +283,7 @@ static int __init dm_init_init(void) 
	if (r)

		goto out;



	DMINFO("waiting for all devices to be available before creating mapped devices\n");

	DMINFO("waiting for all devices to be available before creating mapped devices");

	wait_for_device_probe();



	list_for_each_entry(dev, &devices, list) {

drivers/md/dm-log-writes.c

+21 −2
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ 


#define WRITE_LOG_VERSION 1ULL

#define WRITE_LOG_MAGIC 0x6a736677736872ULL

#define WRITE_LOG_SUPER_SECTOR 0



/*

 * The disk format for this is braindead simple.
@@ -115,6 +116,7 @@ struct log_writes_c { 
	struct list_head logging_blocks;

	wait_queue_head_t wait;

	struct task_struct *log_kthread;

	struct completion super_done;

};



struct pending_block {
@@ -180,6 +182,14 @@ static void log_end_io(struct bio *bio) 
	bio_put(bio);

}



static void log_end_super(struct bio *bio)

{

	struct log_writes_c *lc = bio->bi_private;



	complete(&lc->super_done);

	log_end_io(bio);

}



/*

 * Meant to be called if there is an error, it will free all the pages

 * associated with the block.
@@ -215,7 +225,8 @@ static int write_metadata(struct log_writes_c *lc, void *entry, 
	bio->bi_iter.bi_size = 0;

	bio->bi_iter.bi_sector = sector;

	bio_set_dev(bio, lc->logdev->bdev);

	bio->bi_end_io = log_end_io;

	bio->bi_end_io = (sector == WRITE_LOG_SUPER_SECTOR) ?

			  log_end_super : log_end_io;

	bio->bi_private = lc;

	bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
@@ -418,11 +429,18 @@ static int log_super(struct log_writes_c *lc) 
	super.nr_entries = cpu_to_le64(lc->logged_entries);

	super.sectorsize = cpu_to_le32(lc->sectorsize);



	if (write_metadata(lc, &super, sizeof(super), NULL, 0, 0)) {

	if (write_metadata(lc, &super, sizeof(super), NULL, 0,

			   WRITE_LOG_SUPER_SECTOR)) {

		DMERR("Couldn't write super");

		return -1;

	}



	/*

	 * Super sector should be writen in-order, otherwise the

	 * nr_entries could be rewritten incorrectly by an old bio.

	 */

	wait_for_completion_io(&lc->super_done);



	return 0;

}
@@ -531,6 +549,7 @@ static int log_writes_ctr(struct dm_target *ti, unsigned int argc, char **argv) 
	INIT_LIST_HEAD(&lc->unflushed_blocks);

	INIT_LIST_HEAD(&lc->logging_blocks);

	init_waitqueue_head(&lc->wait);

	init_completion(&lc->super_done);

	atomic_set(&lc->io_blocks, 0);

	atomic_set(&lc->pending_blocks, 0);

drivers/md/dm-table.c

+1 −1
Original line number Diff line number Diff line
@@ -561,7 +561,7 @@ static char **realloc_argv(unsigned *size, char **old_argv) 
		gfp = GFP_NOIO;

	}

	argv = kmalloc_array(new_size, sizeof(*argv), gfp);

	if (argv) {

	if (argv && old_argv) {

		memcpy(argv, old_argv, *size * sizeof(*argv));

		*size = new_size;

	}

drivers/md/dm-verity-target.c

+2 −2
Original line number Diff line number Diff line
@@ -235,8 +235,8 @@ static int verity_handle_err(struct dm_verity *v, enum verity_block_type type, 
		BUG();

	}



	DMERR("%s: %s block %llu is corrupted", v->data_dev->name, type_str,

		block);

	DMERR_LIMIT("%s: %s block %llu is corrupted", v->data_dev->name,

		    type_str, block);



	if (v->corrupted_errs == DM_VERITY_MAX_CORRUPTED_ERRS)

		DMERR("%s: reached maximum errors", v->data_dev->name);