Merge tag 'for-6.5/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Update DM crypt to allocate compound pages if possible

 - Fix DM crypt target's crypt_ctr_cipher_new return value on invalid
   AEAD cipher

 - Fix DM flakey testing target's write bio corruption feature to
   corrupt the data of a cloned bio instead of the original

 - Add random_read_corrupt and random_write_corrupt features to DM
   flakey target

 - Fix ABBA deadlock in DM thin metadata by resetting associated bufio
   client rather than destroying and recreating it

 - A couple other small DM thinp cleanups

 - Update DM core to support disabling block core IO stats accounting
   and optimize away code that isn't needed if stats are disabled

 - Other small DM core cleanups

 - Improve DM integrity target to not require so much memory on 32 bit
   systems. Also only allocate the recalculate buffer as needed (and
   increasingly reduce its size on allocation failure)

 - Update DM integrity to use %*ph for printing hexdump of a small
   buffer. Also update DM integrity documentation

 - Various DM core ioctl interface hardening. Now more careful about
   alignment of structures and processing of input passed to the kernel
   from userspace.

   Also disallow the creation of DM devices named "control", "." or ".."

 - Eliminate GFP_NOIO workarounds for __vmalloc and kvmalloc in DM
   core's ioctl and bufio code

* tag 'for-6.5/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (28 commits)
  dm: get rid of GFP_NOIO workarounds for __vmalloc and kvmalloc
  dm integrity: scale down the recalculate buffer if memory allocation fails
  dm integrity: only allocate recalculate buffer when needed
  dm integrity: reduce vmalloc space footprint on 32-bit architectures
  dm ioctl: Refuse to create device named "." or ".."
  dm ioctl: Refuse to create device named "control"
  dm ioctl: Avoid double-fetch of version
  dm ioctl: structs and parameter strings must not overlap
  dm ioctl: Avoid pointer arithmetic overflow
  dm ioctl: Check dm_target_spec is sufficiently aligned
  Documentation: dm-integrity: Document an example of how the tunables relate.
  Documentation: dm-integrity: Document default values.
  Documentation: dm-integrity: Document the meaning of "buffer".
  Documentation: dm-integrity: Fix minor grammatical error.
  dm integrity: Use %*ph for printing hexdump of a small buffer
  dm thin: disable discards for thin-pool if no_discard_passdown
  dm: remove stale/redundant dm_internal_{suspend,resume} prototypes in dm.h
  dm: skip dm-stats work in alloc_io() unless needed
  dm: avoid needless dm_io access if all IO accounting is disabled
  dm: support turning off block-core's io stats accounting
  ...

1 files changed, 36 insertions, 15 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 15424bfea7ee..27f4aa8d10bd 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1661,6 +1661,9 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone);
  * In order to not degrade performance with excessive locking, we try
  * non-blocking allocations without a mutex first but on failure we fallback
  * to blocking allocations with a mutex.
+ *
+ * In order to reduce allocation overhead, we try to allocate compound pages in
+ * the first pass. If they are not available, we fall back to the mempool.
  */
 static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size)
 {
@@ -1668,8 +1671,8 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size)
 	struct bio *clone;
 	unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
-	unsigned int i, len, remaining_size;
-	struct page *page;
+	unsigned int remaining_size;
+	unsigned int order = MAX_ORDER - 1;
 
 retry:
 	if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
@@ -1682,19 +1685,34 @@ retry:
 
 	remaining_size = size;
 
-	for (i = 0; i < nr_iovecs; i++) {
-		page = mempool_alloc(&cc->page_pool, gfp_mask);
-		if (!page) {
+	while (remaining_size) {
+		struct page *pages;
+		unsigned size_to_add;
+		unsigned remaining_order = __fls((remaining_size + PAGE_SIZE - 1) >> PAGE_SHIFT);
+		order = min(order, remaining_order);
+
+		while (order > 0) {
+			pages = alloc_pages(gfp_mask
+				| __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | __GFP_COMP,
+				order);
+			if (likely(pages != NULL))
+				goto have_pages;
+			order--;
+		}
+
+		pages = mempool_alloc(&cc->page_pool, gfp_mask);
+		if (!pages) {
 			crypt_free_buffer_pages(cc, clone);
 			bio_put(clone);
 			gfp_mask |= __GFP_DIRECT_RECLAIM;
+			order = 0;
 			goto retry;
 		}
 
-		len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
-
-		__bio_add_page(clone, page, len, 0);
-		remaining_size -= len;
+have_pages:
+		size_to_add = min((unsigned)PAGE_SIZE << order, remaining_size);
+		__bio_add_page(clone, pages, size_to_add, 0);
+		remaining_size -= size_to_add;
 	}
 
 	/* Allocate space for integrity tags */
@@ -1712,12 +1730,15 @@ retry:
 
 static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
 {
-	struct bio_vec *bv;
-	struct bvec_iter_all iter_all;
+	struct folio_iter fi;
 
-	bio_for_each_segment_all(bv, clone, iter_all) {
-		BUG_ON(!bv->bv_page);
-		mempool_free(bv->bv_page, &cc->page_pool);
+	if (clone->bi_vcnt > 0) { /* bio_for_each_folio_all crashes with an empty bio */
+		bio_for_each_folio_all(fi, clone) {
+			if (folio_test_large(fi.folio))
+				folio_put(fi.folio);
+			else
+				mempool_free(&fi.folio->page, &cc->page_pool);
+		}
 	}
 }
 
@@ -2887,7 +2908,7 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key
 		ret = crypt_ctr_auth_cipher(cc, cipher_api);
 		if (ret < 0) {
 			ti->error = "Invalid AEAD cipher spec";
-			return -ENOMEM;
+			return ret;
 		}
 	}