Merge tag 'for-6.12-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "This brings mostly refactoring, cleanups, minor performance
  optimizations and usual fixes. The folio API conversions are most
  noticeable.

  There's one less visible change that could have a high impact. The
  extent lock scope for read is reduced, not held for the entire
  operation. In the buffered read case it's left to page or inode lock,
  some direct io read synchronization is still needed.

  This used to prevent deadlocks induced by page faults during direct
  io, so there was a 4K limitation on the requests, e.g. for io_uring.
  In the future this will allow smoother integration with iomap where
  the extent read lock was a major obstacle.

  User visible changes:

   - the FSTRIM ioctl updates the processed range even after an error or
     interruption

   - cleaner thread is woken up in SYNC ioctl instead of waking the
     transaction thread that can take some delay before waking up the
     cleaner, this can speed up cleaning of deleted subvolumes

   - print an error message when opening a device fail, e.g. when it's
     unexpectedly read-only

  Core changes:

   - improved extent map handling in various ways (locking, iteration, ...)

   - new assertions and locking annotations

   - raid-stripe-tree locking fixes

   - use xarray for tracking dirty qgroup extents, switched from rb-tree

   - turn the subpage test to compile-time condition if possible (e.g.
     on x86_64 with 4K pages), this allows to skip a lot of ifs and
     remove dead code

   - more preparatory work for compression in subpage mode

  Cleanups and refactoring

   - folio API conversions, many simple cases where page is passed so
     switch it to folios

   - more subpage code refactoring, update page state bitmap processing

   - introduce auto free for btrfs_path structure, use for the simple
     cases"

* tag 'for-6.12-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (110 commits)
  btrfs: only unlock the to-be-submitted ranges inside a folio
  btrfs: merge btrfs_folio_unlock_writer() into btrfs_folio_end_writer_lock()
  btrfs: BTRFS_PATH_AUTO_FREE in orphan.c
  btrfs: use btrfs_path auto free in zoned.c
  btrfs: DEFINE_FREE for struct btrfs_path
  btrfs: remove btrfs_folio_end_all_writers()
  btrfs: constify more pointer parameters
  btrfs: rework BTRFS_I as macro to preserve parameter const
  btrfs: add and use helper to verify the calling task has locked the inode
  btrfs: always update fstrim_range on failure in FITRIM ioctl
  btrfs: convert copy_inline_to_page() to use folio
  btrfs: convert btrfs_decompress() to take a folio
  btrfs: convert zstd_decompress() to take a folio
  btrfs: convert lzo_decompress() to take a folio
  btrfs: convert zlib_decompress() to take a folio
  btrfs: convert try_release_extent_mapping() to take a folio
  btrfs: convert try_release_extent_state() to take a folio
  btrfs: convert submit_eb_page() to take a folio
  btrfs: convert submit_eb_subpage() to take a folio
  btrfs: convert read_key_bytes() to take a folio
  ...

1 files changed, 198 insertions, 174 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b1b6564ab68f..edac499fd83d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -116,7 +116,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr);
 static int btrfs_truncate(struct btrfs_inode *inode, bool skip_writeback);
 
 static noinline int run_delalloc_cow(struct btrfs_inode *inode,
-				     struct page *locked_page, u64 start,
+				     struct folio *locked_folio, u64 start,
 				     u64 end, struct writeback_control *wbc,
 				     bool pages_dirty);
 
@@ -393,17 +393,17 @@ void btrfs_inode_unlock(struct btrfs_inode *inode, unsigned int ilock_flags)
  * extent (btrfs_finish_ordered_io()).
  */
 static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode *inode,
-						 struct page *locked_page,
+						 struct folio *locked_folio,
 						 u64 offset, u64 bytes)
 {
 	unsigned long index = offset >> PAGE_SHIFT;
 	unsigned long end_index = (offset + bytes - 1) >> PAGE_SHIFT;
 	u64 page_start = 0, page_end = 0;
-	struct page *page;
+	struct folio *folio;
 
-	if (locked_page) {
-		page_start = page_offset(locked_page);
-		page_end = page_start + PAGE_SIZE - 1;
+	if (locked_folio) {
+		page_start = folio_pos(locked_folio);
+		page_end = page_start + folio_size(locked_folio) - 1;
 	}
 
 	while (index <= end_index) {
@@ -417,13 +417,13 @@ static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode *inode,
 		 * btrfs_mark_ordered_io_finished() would skip the accounting
 		 * for the page range, and the ordered extent will never finish.
 		 */
-		if (locked_page && index == (page_start >> PAGE_SHIFT)) {
+		if (locked_folio && index == (page_start >> PAGE_SHIFT)) {
 			index++;
 			continue;
 		}
-		page = find_get_page(inode->vfs_inode.i_mapping, index);
+		folio = __filemap_get_folio(inode->vfs_inode.i_mapping, index, 0, 0);
 		index++;
-		if (!page)
+		if (IS_ERR(folio))
 			continue;
 
 		/*
@@ -431,14 +431,14 @@ static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode *inode,
 		 * range, then btrfs_mark_ordered_io_finished() will handle
 		 * the ordered extent accounting for the range.
 		 */
-		btrfs_folio_clamp_clear_ordered(inode->root->fs_info,
-						page_folio(page), offset, bytes);
-		put_page(page);
+		btrfs_folio_clamp_clear_ordered(inode->root->fs_info, folio,
+						offset, bytes);
+		folio_put(folio);
 	}
 
-	if (locked_page) {
+	if (locked_folio) {
 		/* The locked page covers the full range, nothing needs to be done */
-		if (bytes + offset <= page_start + PAGE_SIZE)
+		if (bytes + offset <= page_start + folio_size(locked_folio))
 			return;
 		/*
 		 * In case this page belongs to the delalloc range being
@@ -447,8 +447,9 @@ static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode *inode,
 		 * run_delalloc_range
 		 */
 		if (page_start >= offset && page_end <= (offset + bytes - 1)) {
-			bytes = offset + bytes - page_offset(locked_page) - PAGE_SIZE;
-			offset = page_offset(locked_page) + PAGE_SIZE;
+			bytes = offset + bytes - folio_pos(locked_folio) -
+				folio_size(locked_folio);
+			offset = folio_pos(locked_folio) + folio_size(locked_folio);
 		}
 	}
 
@@ -494,7 +495,6 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 {
 	struct btrfs_root *root = inode->root;
 	struct extent_buffer *leaf;
-	struct page *page = NULL;
 	const u32 sectorsize = trans->fs_info->sectorsize;
 	char *kaddr;
 	unsigned long ptr;
@@ -554,12 +554,16 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 		btrfs_set_file_extent_compression(leaf, ei,
 						  compress_type);
 	} else {
-		page = find_get_page(inode->vfs_inode.i_mapping, 0);
+		struct folio *folio;
+
+		folio = __filemap_get_folio(inode->vfs_inode.i_mapping,
+					    0, 0, 0);
+		ASSERT(!IS_ERR(folio));
 		btrfs_set_file_extent_compression(leaf, ei, 0);
-		kaddr = kmap_local_page(page);
+		kaddr = kmap_local_folio(folio, 0);
 		write_extent_buffer(leaf, kaddr, ptr, size);
 		kunmap_local(kaddr);
-		put_page(page);
+		folio_put(folio);
 	}
 	btrfs_mark_buffer_dirty(trans, leaf);
 	btrfs_release_path(path);
@@ -715,7 +719,7 @@ out:
 }
 
 static noinline int cow_file_range_inline(struct btrfs_inode *inode,
-					  struct page *locked_page,
+					  struct folio *locked_folio,
 					  u64 offset, u64 end,
 					  size_t compressed_size,
 					  int compress_type,
@@ -740,13 +744,26 @@ static noinline int cow_file_range_inline(struct btrfs_inode *inode,
 		return ret;
 	}
 
+	/*
+	 * In the successful case (ret == 0 here), cow_file_range will return 1.
+	 *
+	 * Quite a bit further up the callstack in extent_writepage(), ret == 1
+	 * is treated as a short circuited success and does not unlock the folio,
+	 * so we must do it here.
+	 *
+	 * In the failure case, the locked_folio does get unlocked by
+	 * btrfs_folio_end_all_writers, which asserts that it is still locked
+	 * at that point, so we must *not* unlock it here.
+	 *
+	 * The other two callsites in compress_file_range do not have a
+	 * locked_folio, so they are not relevant to this logic.
+	 */
 	if (ret == 0)
-		locked_page = NULL;
+		locked_folio = NULL;
 
-	extent_clear_unlock_delalloc(inode, offset, end, locked_page, &cached,
-				     clear_flags,
-				     PAGE_UNLOCK | PAGE_START_WRITEBACK |
-				     PAGE_END_WRITEBACK);
+	extent_clear_unlock_delalloc(inode, offset, end, locked_folio, &cached,
+				     clear_flags, PAGE_UNLOCK |
+				     PAGE_START_WRITEBACK | PAGE_END_WRITEBACK);
 	return ret;
 }
 
@@ -762,7 +779,7 @@ struct async_extent {
 
 struct async_chunk {
 	struct btrfs_inode *inode;
-	struct page *locked_page;
+	struct folio *locked_folio;
 	u64 start;
 	u64 end;
 	blk_opf_t write_flags;
@@ -868,25 +885,25 @@ static inline void inode_should_defrag(struct btrfs_inode *inode,
 	/* If this is a small write inside eof, kick off a defrag */
 	if (num_bytes < small_write &&
 	    (start > 0 || end + 1 < inode->disk_i_size))
-		btrfs_add_inode_defrag(NULL, inode, small_write);
+		btrfs_add_inode_defrag(inode, small_write);
 }
 
 static int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
 {
 	unsigned long end_index = end >> PAGE_SHIFT;
-	struct page *page;
+	struct folio *folio;
 	int ret = 0;
 
 	for (unsigned long index = start >> PAGE_SHIFT;
 	     index <= end_index; index++) {
-		page = find_get_page(inode->i_mapping, index);
-		if (unlikely(!page)) {
+		folio = __filemap_get_folio(inode->i_mapping, index, 0, 0);
+		if (IS_ERR(folio)) {
 			if (!ret)
-				ret = -ENOENT;
+				ret = PTR_ERR(folio);
 			continue;
 		}
-		clear_page_dirty_for_io(page);
-		put_page(page);
+		folio_clear_dirty_for_io(folio);
+		folio_put(folio);
 	}
 	return ret;
 }
@@ -1122,7 +1139,7 @@ static void free_async_extent_pages(struct async_extent *async_extent)
 
 static void submit_uncompressed_range(struct btrfs_inode *inode,
 				      struct async_extent *async_extent,
-				      struct page *locked_page)
+				      struct folio *locked_folio)
 {
 	u64 start = async_extent->start;
 	u64 end = async_extent->start + async_extent->ram_size - 1;
@@ -1135,20 +1152,22 @@ static void submit_uncompressed_range(struct btrfs_inode *inode,
 	};
 
 	wbc_attach_fdatawrite_inode(&wbc, &inode->vfs_inode);
-	ret = run_delalloc_cow(inode, locked_page, start, end, &wbc, false);
+	ret = run_delalloc_cow(inode, locked_folio, start, end,
+			       &wbc, false);
 	wbc_detach_inode(&wbc);
 	if (ret < 0) {
-		btrfs_cleanup_ordered_extents(inode, locked_page, start, end - start + 1);
-		if (locked_page) {
-			const u64 page_start = page_offset(locked_page);
-
-			set_page_writeback(locked_page);
-			end_page_writeback(locked_page);
-			btrfs_mark_ordered_io_finished(inode, locked_page,
+		btrfs_cleanup_ordered_extents(inode, locked_folio,
+					      start, end - start + 1);
+		if (locked_folio) {
+			const u64 page_start = folio_pos(locked_folio);
+
+			folio_start_writeback(locked_folio);
+			folio_end_writeback(locked_folio);
+			btrfs_mark_ordered_io_finished(inode, locked_folio,
 						       page_start, PAGE_SIZE,
 						       !ret);
-			mapping_set_error(locked_page->mapping, ret);
-			unlock_page(locked_page);
+			mapping_set_error(locked_folio->mapping, ret);
+			folio_unlock(locked_folio);
 		}
 	}
 }
@@ -1164,7 +1183,7 @@ static void submit_one_async_extent(struct async_chunk *async_chunk,
 	struct btrfs_ordered_extent *ordered;
 	struct btrfs_file_extent file_extent;
 	struct btrfs_key ins;
-	struct page *locked_page = NULL;
+	struct folio *locked_folio = NULL;
 	struct extent_state *cached = NULL;
 	struct extent_map *em;
 	int ret = 0;
@@ -1175,19 +1194,20 @@ static void submit_one_async_extent(struct async_chunk *async_chunk,
 		kthread_associate_blkcg(async_chunk->blkcg_css);
 
 	/*
-	 * If async_chunk->locked_page is in the async_extent range, we need to
+	 * If async_chunk->locked_folio is in the async_extent range, we need to
 	 * handle it.
 	 */
-	if (async_chunk->locked_page) {
-		u64 locked_page_start = page_offset(async_chunk->locked_page);
-		u64 locked_page_end = locked_page_start + PAGE_SIZE - 1;
+	if (async_chunk->locked_folio) {
+		u64 locked_folio_start = folio_pos(async_chunk->locked_folio);
+		u64 locked_folio_end = locked_folio_start +
+			folio_size(async_chunk->locked_folio) - 1;
 
-		if (!(start >= locked_page_end || end <= locked_page_start))
-			locked_page = async_chunk->locked_page;
+		if (!(start >= locked_folio_end || end <= locked_folio_start))
+			locked_folio = async_chunk->locked_folio;
 	}
 
 	if (async_extent->compress_type == BTRFS_COMPRESS_NONE) {
-		submit_uncompressed_range(inode, async_extent, locked_page);
+		submit_uncompressed_range(inode, async_extent, locked_folio);
 		goto done;
 	}
 
@@ -1202,7 +1222,7 @@ static void submit_one_async_extent(struct async_chunk *async_chunk,
 		 * non-contiguous space for the uncompressed size instead.  So
 		 * fall back to uncompressed.
 		 */
-		submit_uncompressed_range(inode, async_extent, locked_page);
+		submit_uncompressed_range(inode, async_extent, locked_folio);
 		goto done;
 	}
 
@@ -1306,21 +1326,21 @@ u64 btrfs_get_extent_allocation_hint(struct btrfs_inode *inode, u64 start,
  * allocate extents on disk for the range, and create ordered data structs
  * in ram to track those extents.
  *
- * locked_page is the page that writepage had locked already.  We use
+ * locked_folio is the folio that writepage had locked already.  We use
  * it to make sure we don't do extra locks or unlocks.
  *
- * When this function fails, it unlocks all pages except @locked_page.
+ * When this function fails, it unlocks all pages except @locked_folio.
  *
  * When this function successfully creates an inline extent, it returns 1 and
- * unlocks all pages including locked_page and starts I/O on them.
- * (In reality inline extents are limited to a single page, so locked_page is
+ * unlocks all pages including locked_folio and starts I/O on them.
+ * (In reality inline extents are limited to a single page, so locked_folio is
  * the only page handled anyway).
  *
  * When this function succeed and creates a normal extent, the page locking
  * status depends on the passed in flags:
  *
  * - If @keep_locked is set, all pages are kept locked.
- * - Else all pages except for @locked_page are unlocked.
+ * - Else all pages except for @locked_folio are unlocked.
  *
  * When a failure happens in the second or later iteration of the
  * while-loop, the ordered extents created in previous iterations are kept
@@ -1329,8 +1349,8 @@ u64 btrfs_get_extent_allocation_hint(struct btrfs_inode *inode, u64 start,
  * example.
  */
 static noinline int cow_file_range(struct btrfs_inode *inode,
-				   struct page *locked_page, u64 start, u64 end,
-				   u64 *done_offset,
+				   struct folio *locked_folio, u64 start,
+				   u64 end, u64 *done_offset,
 				   bool keep_locked, bool no_inline)
 {
 	struct btrfs_root *root = inode->root;
@@ -1363,7 +1383,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
 
 	if (!no_inline) {
 		/* lets try to make an inline extent */
-		ret = cow_file_range_inline(inode, locked_page, start, end, 0,
+		ret = cow_file_range_inline(inode, locked_folio, start, end, 0,
 					    BTRFS_COMPRESS_NONE, NULL, false);
 		if (ret <= 0) {
 			/*
@@ -1500,7 +1520,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
 		page_ops |= PAGE_SET_ORDERED;
 
 		extent_clear_unlock_delalloc(inode, start, start + ram_size - 1,
-					     locked_page, &cached,
+					     locked_folio, &cached,
 					     EXTENT_LOCKED | EXTENT_DELALLOC,
 					     page_ops);
 		if (num_bytes < cur_alloc_size)
@@ -1553,13 +1573,13 @@ out_unlock:
 	 * function.
 	 *
 	 * However, in case of @keep_locked, we still need to unlock the pages
-	 * (except @locked_page) to ensure all the pages are unlocked.
+	 * (except @locked_folio) to ensure all the pages are unlocked.
 	 */
 	if (keep_locked && orig_start < start) {
-		if (!locked_page)
+		if (!locked_folio)
 			mapping_set_error(inode->vfs_inode.i_mapping, ret);
 		extent_clear_unlock_delalloc(inode, orig_start, start - 1,
-					     locked_page, NULL, 0, page_ops);
+					     locked_folio, NULL, 0, page_ops);
 	}
 
 	/*
@@ -1582,8 +1602,7 @@ out_unlock:
 	if (extent_reserved) {
 		extent_clear_unlock_delalloc(inode, start,
 					     start + cur_alloc_size - 1,
-					     locked_page, &cached,
-					     clear_bits,
+					     locked_folio, &cached, clear_bits,
 					     page_ops);
 		btrfs_qgroup_free_data(inode, NULL, start, cur_alloc_size, NULL);
 		start += cur_alloc_size;
@@ -1597,7 +1616,7 @@ out_unlock:
 	 */
 	if (start < end) {
 		clear_bits |= EXTENT_CLEAR_DATA_RESV;
-		extent_clear_unlock_delalloc(inode, start, end, locked_page,
+		extent_clear_unlock_delalloc(inode, start, end, locked_folio,
 					     &cached, clear_bits, page_ops);
 		btrfs_qgroup_free_data(inode, NULL, start, cur_alloc_size, NULL);
 	}
@@ -1651,7 +1670,7 @@ static noinline void submit_compressed_extents(struct btrfs_work *work, bool do_
 }
 
 static bool run_delalloc_compressed(struct btrfs_inode *inode,
-				    struct page *locked_page, u64 start,
+				    struct folio *locked_folio, u64 start,
 				    u64 end, struct writeback_control *wbc)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
@@ -1691,15 +1710,16 @@ static bool run_delalloc_compressed(struct btrfs_inode *inode,
 		INIT_LIST_HEAD(&async_chunk[i].extents);
 
 		/*
-		 * The locked_page comes all the way from writepage and its
-		 * the original page we were actually given.  As we spread
+		 * The locked_folio comes all the way from writepage and its
+		 * the original folio we were actually given.  As we spread
 		 * this large delalloc region across multiple async_chunk
-		 * structs, only the first struct needs a pointer to locked_page
+		 * structs, only the first struct needs a pointer to
+		 * locked_folio.
 		 *
 		 * This way we don't need racey decisions about who is supposed
 		 * to unlock it.
 		 */
-		if (locked_page) {
+		if (locked_folio) {
 			/*
 			 * Depending on the compressibility, the pages might or
 			 * might not go through async.  We want all of them to
@@ -1709,12 +1729,12 @@ static bool run_delalloc_compressed(struct btrfs_inode *inode,
 			 * need full accuracy.  Just account the whole thing
 			 * against the first page.
 			 */
-			wbc_account_cgroup_owner(wbc, locked_page,
+			wbc_account_cgroup_owner(wbc, &locked_folio->page,
 						 cur_end - start);
-			async_chunk[i].locked_page = locked_page;
-			locked_page = NULL;
+			async_chunk[i].locked_folio = locked_folio;
+			locked_folio = NULL;
 		} else {
-			async_chunk[i].locked_page = NULL;
+			async_chunk[i].locked_folio = NULL;
 		}
 
 		if (blkcg_css != blkcg_root_css) {
@@ -1743,7 +1763,7 @@ static bool run_delalloc_compressed(struct btrfs_inode *inode,
  * covered by the range.
  */
 static noinline int run_delalloc_cow(struct btrfs_inode *inode,
-				     struct page *locked_page, u64 start,
+				     struct folio *locked_folio, u64 start,
 				     u64 end, struct writeback_control *wbc,
 				     bool pages_dirty)
 {
@@ -1751,20 +1771,21 @@ static noinline int run_delalloc_cow(struct btrfs_inode *inode,
 	int ret;
 
 	while (start <= end) {
-		ret = cow_file_range(inode, locked_page, start, end, &done_offset,
-				     true, false);
+		ret = cow_file_range(inode, locked_folio, start, end,
+				     &done_offset, true, false);
 		if (ret)
 			return ret;
-		extent_write_locked_range(&inode->vfs_inode, locked_page, start,
-					  done_offset, wbc, pages_dirty);
+		extent_write_locked_range(&inode->vfs_inode, locked_folio,
+					  start, done_offset, wbc, pages_dirty);
 		start = done_offset + 1;
 	}
 
 	return 1;
 }
 
-static int fallback_to_cow(struct btrfs_inode *inode, struct page *locked_page,
-			   const u64 start, const u64 end)
+static int fallback_to_cow(struct btrfs_inode *inode,
+			   struct folio *locked_folio, const u64 start,
+			   const u64 end)
 {
 	const bool is_space_ino = btrfs_is_free_space_inode(inode);
 	const bool is_reloc_ino = btrfs_is_data_reloc_root(inode->root);
@@ -1833,7 +1854,8 @@ static int fallback_to_cow(struct btrfs_inode *inode, struct page *locked_page,
 	 * is written out and unlocked directly and a normal NOCOW extent
 	 * doesn't work.
 	 */
-	ret = cow_file_range(inode, locked_page, start, end, NULL, false, true);
+	ret = cow_file_range(inode, locked_folio, start, end, NULL, false,
+			     true);
 	ASSERT(ret != 1);
 	return ret;
 }
@@ -1987,7 +2009,7 @@ static int can_nocow_file_extent(struct btrfs_path *path,
  * blocks on disk
  */
 static noinline int run_delalloc_nocow(struct btrfs_inode *inode,
-				       struct page *locked_page,
+				       struct folio *locked_folio,
 				       const u64 start, const u64 end)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
@@ -2150,8 +2172,8 @@ must_cow:
 		 * NOCOW, following one which needs to be COW'ed
 		 */
 		if (cow_start != (u64)-1) {
-			ret = fallback_to_cow(inode, locked_page,
-					      cow_start, found_key.offset - 1);
+			ret = fallback_to_cow(inode, locked_folio, cow_start,
+					      found_key.offset - 1);
 			cow_start = (u64)-1;
 			if (ret) {
 				btrfs_dec_nocow_writers(nocow_bg);
@@ -2206,7 +2228,7 @@ must_cow:
 		btrfs_put_ordered_extent(ordered);
 
 		extent_clear_unlock_delalloc(inode, cur_offset, nocow_end,
-					     locked_page, &cached_state,
+					     locked_folio, &cached_state,
 					     EXTENT_LOCKED | EXTENT_DELALLOC |
 					     EXTENT_CLEAR_DATA_RESV,
 					     PAGE_UNLOCK | PAGE_SET_ORDERED);
@@ -2228,7 +2250,7 @@ must_cow:
 
 	if (cow_start != (u64)-1) {
 		cur_offset = end;
-		ret = fallback_to_cow(inode, locked_page, cow_start, end);
+		ret = fallback_to_cow(inode, locked_folio, cow_start, end);
 		cow_start = (u64)-1;
 		if (ret)
 			goto error;
@@ -2255,7 +2277,7 @@ error:
 
 		lock_extent(&inode->io_tree, cur_offset, end, &cached);
 		extent_clear_unlock_delalloc(inode, cur_offset, end,
-					     locked_page, &cached,
+					     locked_folio, &cached,
 					     EXTENT_LOCKED | EXTENT_DELALLOC |
 					     EXTENT_DEFRAG |
 					     EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
@@ -2282,39 +2304,39 @@ static bool should_nocow(struct btrfs_inode *inode, u64 start, u64 end)
  * Function to process delayed allocation (create CoW) for ranges which are
  * being touched for the first time.
  */
-int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
+int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_folio,
 			     u64 start, u64 end, struct writeback_control *wbc)
 {
 	const bool zoned = btrfs_is_zoned(inode->root->fs_info);
 	int ret;
 
 	/*
-	 * The range must cover part of the @locked_page, or a return of 1
+	 * The range must cover part of the @locked_folio, or a return of 1
 	 * can confuse the caller.
 	 */
-	ASSERT(!(end <= page_offset(locked_page) ||
-		 start >= page_offset(locked_page) + PAGE_SIZE));
+	ASSERT(!(end <= folio_pos(locked_folio) ||
+		 start >= folio_pos(locked_folio) + folio_size(locked_folio)));
 
 	if (should_nocow(inode, start, end)) {
-		ret = run_delalloc_nocow(inode, locked_page, start, end);
+		ret = run_delalloc_nocow(inode, locked_folio, start, end);
 		goto out;
 	}
 
 	if (btrfs_inode_can_compress(inode) &&
 	    inode_need_compress(inode, start, end) &&
-	    run_delalloc_compressed(inode, locked_page, start, end, wbc))
+	    run_delalloc_compressed(inode, locked_folio, start, end, wbc))
 		return 1;
 
 	if (zoned)
-		ret = run_delalloc_cow(inode, locked_page, start, end, wbc,
+		ret = run_delalloc_cow(inode, locked_folio, start, end, wbc,
 				       true);
 	else
-		ret = cow_file_range(inode, locked_page, start, end, NULL,
+		ret = cow_file_range(inode, locked_folio, start, end, NULL,
 				     false, false);
 
 out:
 	if (ret < 0)
-		btrfs_cleanup_ordered_extents(inode, locked_page, start,
+		btrfs_cleanup_ordered_extents(inode, locked_folio, start,
 					      end - start + 1);
 	return ret;
 }
@@ -2690,7 +2712,7 @@ int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
 
 /* see btrfs_writepage_start_hook for details on why this is required */
 struct btrfs_writepage_fixup {
-	struct page *page;
+	struct folio *folio;
 	struct btrfs_inode *inode;
 	struct btrfs_work work;
 };
@@ -2702,50 +2724,51 @@ static void btrfs_writepage_fixup_worker(struct btrfs_work *work)
 	struct btrfs_ordered_extent *ordered;
 	struct extent_state *cached_state = NULL;
 	struct extent_changeset *data_reserved = NULL;
-	struct page *page = fixup->page;
+	struct folio *folio = fixup->folio;
 	struct btrfs_inode *inode = fixup->inode;
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
-	u64 page_start = page_offset(page);
-	u64 page_end = page_offset(page) + PAGE_SIZE - 1;
+	u64 page_start = folio_pos(folio);
+	u64 page_end = folio_pos(folio) + folio_size(folio) - 1;
 	int ret = 0;
 	bool free_delalloc_space = true;
 
 	/*
 	 * This is similar to page_mkwrite, we need to reserve the space before
-	 * we take the page lock.
+	 * we take the folio lock.
 	 */
 	ret = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
-					   PAGE_SIZE);
+					   folio_size(folio));
 again:
-	lock_page(page);
+	folio_lock(folio);
 
 	/*
-	 * Before we queued this fixup, we took a reference on the page.
-	 * page->mapping may go NULL, but it shouldn't be moved to a different
+	 * Before we queued this fixup, we took a reference on the folio.
+	 * folio->mapping may go NULL, but it shouldn't be moved to a different
 	 * address space.
 	 */
-	if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
+	if (!folio->mapping || !folio_test_dirty(folio) ||
+	    !folio_test_checked(folio)) {
 		/*
 		 * Unfortunately this is a little tricky, either
 		 *
-		 * 1) We got here and our page had already been dealt with and
+		 * 1) We got here and our folio had already been dealt with and
 		 *    we reserved our space, thus ret == 0, so we need to just
 		 *    drop our space reservation and bail.  This can happen the
 		 *    first time we come into the fixup worker, or could happen
 		 *    while waiting for the ordered extent.
-		 * 2) Our page was already dealt with, but we happened to get an
+		 * 2) Our folio was already dealt with, but we happened to get an
 		 *    ENOSPC above from the btrfs_delalloc_reserve_space.  In
 		 *    this case we obviously don't have anything to release, but
-		 *    because the page was already dealt with we don't want to
-		 *    mark the page with an error, so make sure we're resetting
+		 *    because the folio was already dealt with we don't want to
+		 *    mark the folio with an error, so make sure we're resetting
 		 *    ret to 0.  This is why we have this check _before_ the ret
 		 *    check, because we do not want to have a surprise ENOSPC
-		 *    when the page was already properly dealt with.
+		 *    when the folio was already properly dealt with.
 		 */
 		if (!ret) {
-			btrfs_delalloc_release_extents(inode, PAGE_SIZE);
+			btrfs_delalloc_release_extents(inode, folio_size(folio));
 			btrfs_delalloc_release_space(inode, data_reserved,
-						     page_start, PAGE_SIZE,
+						     page_start, folio_size(folio),
 						     true);
 		}
 		ret = 0;
@@ -2753,7 +2776,7 @@ again:
 	}
 
 	/*
-	 * We can't mess with the page state unless it is locked, so now that
+	 * We can't mess with the folio state unless it is locked, so now that
 	 * it is locked bail if we failed to make our space reservation.
 	 */
 	if (ret)
@@ -2762,14 +2785,14 @@ again:
 	lock_extent(&inode->io_tree, page_start, page_end, &cached_state);
 
 	/* already ordered? We're done */
-	if (PageOrdered(page))
+	if (folio_test_ordered(folio))
 		goto out_reserved;
 
 	ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE);
 	if (ordered) {
 		unlock_extent(&inode->io_tree, page_start, page_end,
 			      &cached_state);
-		unlock_page(page);
+		folio_unlock(folio);
 		btrfs_start_ordered_extent(ordered);
 		btrfs_put_ordered_extent(ordered);
 		goto again;
@@ -2787,7 +2810,7 @@ again:
 	 *
 	 * The page was dirty when we started, nothing should have cleaned it.
 	 */
-	BUG_ON(!PageDirty(page));
+	BUG_ON(!folio_test_dirty(folio));
 	free_delalloc_space = false;
 out_reserved:
 	btrfs_delalloc_release_extents(inode, PAGE_SIZE);
@@ -2801,14 +2824,14 @@ out_page:
 		 * We hit ENOSPC or other errors.  Update the mapping and page
 		 * to reflect the errors and clean the page.
 		 */
-		mapping_set_error(page->mapping, ret);
-		btrfs_mark_ordered_io_finished(inode, page, page_start,
-					       PAGE_SIZE, !ret);
-		clear_page_dirty_for_io(page);
-	}
-	btrfs_folio_clear_checked(fs_info, page_folio(page), page_start, PAGE_SIZE);
-	unlock_page(page);
-	put_page(page);
+		mapping_set_error(folio->mapping, ret);
+		btrfs_mark_ordered_io_finished(inode, folio, page_start,
+					       folio_size(folio), !ret);
+		folio_clear_dirty_for_io(folio);
+	}
+	btrfs_folio_clear_checked(fs_info, folio, page_start, PAGE_SIZE);
+	folio_unlock(folio);
+	folio_put(folio);
 	kfree(fixup);
 	extent_changeset_free(data_reserved);
 	/*
@@ -2821,33 +2844,34 @@ out_page:
 
 /*
  * There are a few paths in the higher layers of the kernel that directly
- * set the page dirty bit without asking the filesystem if it is a
+ * set the folio dirty bit without asking the filesystem if it is a
  * good idea.  This causes problems because we want to make sure COW
  * properly happens and the data=ordered rules are followed.
  *
  * In our case any range that doesn't have the ORDERED bit set
  * hasn't been properly setup for IO.  We kick off an async process
  * to fix it up.  The async helper will wait for ordered extents, set
- * the delalloc bit and make it safe to write the page.
+ * the delalloc bit and make it safe to write the folio.
  */
-int btrfs_writepage_cow_fixup(struct page *page)
+int btrfs_writepage_cow_fixup(struct folio *folio)
 {
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
 	struct btrfs_writepage_fixup *fixup;
 
-	/* This page has ordered extent covering it already */
-	if (PageOrdered(page))
+	/* This folio has ordered extent covering it already */
+	if (folio_test_ordered(folio))
 		return 0;
 
 	/*
-	 * PageChecked is set below when we create a fixup worker for this page,
-	 * don't try to create another one if we're already PageChecked()
+	 * folio_checked is set below when we create a fixup worker for this
+	 * folio, don't try to create another one if we're already
+	 * folio_test_checked.
 	 *
-	 * The extent_io writepage code will redirty the page if we send back
+	 * The extent_io writepage code will redirty the foio if we send back
 	 * EAGAIN.
 	 */
-	if (PageChecked(page))
+	if (folio_test_checked(folio))
 		return -EAGAIN;
 
 	fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
@@ -2857,14 +2881,14 @@ int btrfs_writepage_cow_fixup(struct page *page)
 	/*
 	 * We are already holding a reference to this inode from
 	 * write_cache_pages.  We need to hold it because the space reservation
-	 * takes place outside of the page lock, and we can't trust
-	 * page->mapping outside of the page lock.
+	 * takes place outside of the folio lock, and we can't trust
+	 * page->mapping outside of the folio lock.
 	 */
 	ihold(inode);
-	btrfs_folio_set_checked(fs_info, page_folio(page), page_offset(page), PAGE_SIZE);
-	get_page(page);
+	btrfs_folio_set_checked(fs_info, folio, folio_pos(folio), folio_size(folio));
+	folio_get(folio);
 	btrfs_init_work(&fixup->work, btrfs_writepage_fixup_worker, NULL);
-	fixup->page = page;
+	fixup->folio = folio;
 	fixup->inode = BTRFS_I(inode);
 	btrfs_queue_work(fs_info->fixup_workers, &fixup->work);
 
@@ -6700,7 +6724,7 @@ static int btrfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 }
 
 static noinline int uncompress_inline(struct btrfs_path *path,
-				      struct page *page,
+				      struct folio *folio,
 				      struct btrfs_file_extent_item *item)
 {
 	int ret;
@@ -6722,7 +6746,8 @@ static noinline int uncompress_inline(struct btrfs_path *path,
 	read_extent_buffer(leaf, tmp, ptr, inline_size);
 
 	max_size = min_t(unsigned long, PAGE_SIZE, max_size);
-	ret = btrfs_decompress(compress_type, tmp, page, 0, inline_size, max_size);
+	ret = btrfs_decompress(compress_type, tmp, folio, 0, inline_size,
+			       max_size);
 
 	/*
 	 * decompression code contains a memset to fill in any space between the end
@@ -6733,36 +6758,36 @@ static noinline int uncompress_inline(struct btrfs_path *path,
 	 */
 
 	if (max_size < PAGE_SIZE)
-		memzero_page(page, max_size, PAGE_SIZE - max_size);
+		folio_zero_range(folio, max_size, PAGE_SIZE - max_size);
 	kfree(tmp);
 	return ret;
 }
 
 static int read_inline_extent(struct btrfs_inode *inode, struct btrfs_path *path,
-			      struct page *page)
+			      struct folio *folio)
 {
 	struct btrfs_file_extent_item *fi;
 	void *kaddr;
 	size_t copy_size;
 
-	if (!page || PageUptodate(page))
+	if (!folio || folio_test_uptodate(folio))
 		return 0;
 
-	ASSERT(page_offset(page) == 0);
+	ASSERT(folio_pos(folio) == 0);
 
 	fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
 			    struct btrfs_file_extent_item);
 	if (btrfs_file_extent_compression(path->nodes[0], fi) != BTRFS_COMPRESS_NONE)
-		return uncompress_inline(path, page, fi);
+		return uncompress_inline(path, folio, fi);
 
 	copy_size = min_t(u64, PAGE_SIZE,
 			  btrfs_file_extent_ram_bytes(path->nodes[0], fi));
-	kaddr = kmap_local_page(page);
+	kaddr = kmap_local_folio(folio, 0);
 	read_extent_buffer(path->nodes[0], kaddr,
 			   btrfs_file_extent_inline_start(fi), copy_size);
 	kunmap_local(kaddr);
 	if (copy_size < PAGE_SIZE)
-		memzero_page(page, copy_size, PAGE_SIZE - copy_size);
+		folio_zero_range(folio, copy_size, PAGE_SIZE - copy_size);
 	return 0;
 }
 
@@ -6784,7 +6809,7 @@ static int read_inline_extent(struct btrfs_inode *inode, struct btrfs_path *path
  * Return: ERR_PTR on error, non-NULL extent_map on success.
  */
 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
-				    struct page *page, u64 start, u64 len)
+				    struct folio *folio, u64 start, u64 len)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	int ret = 0;
@@ -6807,7 +6832,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 	if (em) {
 		if (em->start > start || em->start + em->len <= start)
 			free_extent_map(em);
-		else if (em->disk_bytenr == EXTENT_MAP_INLINE && page)
+		else if (em->disk_bytenr == EXTENT_MAP_INLINE && folio)
 			free_extent_map(em);
 		else
 			goto out;
@@ -6937,7 +6962,7 @@ next:
 		ASSERT(em->disk_bytenr == EXTENT_MAP_INLINE);
 		ASSERT(em->len == fs_info->sectorsize);
 
-		ret = read_inline_extent(inode, path, page);
+		ret = read_inline_extent(inode, path, folio);
 		if (ret < 0)
 			goto out;
 		goto insert;
@@ -7179,13 +7204,12 @@ struct extent_map *btrfs_create_io_em(struct btrfs_inode *inode, u64 start,
  * for subpage spinlock.  So this function is to spin and wait for subpage
  * spinlock.
  */
-static void wait_subpage_spinlock(struct page *page)
+static void wait_subpage_spinlock(struct folio *folio)
 {
-	struct btrfs_fs_info *fs_info = page_to_fs_info(page);
-	struct folio *folio = page_folio(page);
+	struct btrfs_fs_info *fs_info = folio_to_fs_info(folio);
 	struct btrfs_subpage *subpage;
 
-	if (!btrfs_is_subpage(fs_info, page->mapping))
+	if (!btrfs_is_subpage(fs_info, folio->mapping))
 		return;
 
 	ASSERT(folio_test_private(folio) && folio_get_private(folio));
@@ -7214,9 +7238,9 @@ static int btrfs_launder_folio(struct folio *folio)
 
 static bool __btrfs_release_folio(struct folio *folio, gfp_t gfp_flags)
 {
-	if (try_release_extent_mapping(&folio->page, gfp_flags)) {
-		wait_subpage_spinlock(&folio->page);
-		clear_page_extent_mapped(&folio->page);
+	if (try_release_extent_mapping(folio, gfp_flags)) {
+		wait_subpage_spinlock(folio);
+		clear_folio_extent_mapped(folio);
 		return true;
 	}
 	return false;
@@ -7276,7 +7300,7 @@ static void btrfs_invalidate_folio(struct folio *folio, size_t offset,
 	 * do double ordered extent accounting on the same folio.
 	 */
 	folio_wait_writeback(folio);
-	wait_subpage_spinlock(&folio->page);
+	wait_subpage_spinlock(folio);
 
 	/*
 	 * For subpage case, we have call sites like
@@ -7414,7 +7438,7 @@ next:
 	btrfs_folio_clear_checked(fs_info, folio, folio_pos(folio), folio_size(folio));
 	if (!inode_evicting)
 		__btrfs_release_folio(folio, GFP_NOFS);
-	clear_page_extent_mapped(&folio->page);
+	clear_folio_extent_mapped(folio);
 }
 
 static int btrfs_truncate(struct btrfs_inode *inode, bool skip_writeback)
@@ -8951,19 +8975,19 @@ void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end)
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	unsigned long index = start >> PAGE_SHIFT;
 	unsigned long end_index = end >> PAGE_SHIFT;
-	struct page *page;
+	struct folio *folio;
 	u32 len;
 
 	ASSERT(end + 1 - start <= U32_MAX);
 	len = end + 1 - start;
 	while (index <= end_index) {
-		page = find_get_page(inode->vfs_inode.i_mapping, index);
-		ASSERT(page); /* Pages should be in the extent_io_tree */
+		folio = __filemap_get_folio(inode->vfs_inode.i_mapping, index, 0, 0);
+		ASSERT(!IS_ERR(folio)); /* folios should be in the extent_io_tree */
 
 		/* This is for data, which doesn't yet support larger folio. */
-		ASSERT(folio_order(page_folio(page)) == 0);
-		btrfs_folio_set_writeback(fs_info, page_folio(page), start, len);
-		put_page(page);
+		ASSERT(folio_order(folio) == 0);
+		btrfs_folio_set_writeback(fs_info, folio, start, len);
+		folio_put(folio);
 		index++;
 	}
 }
@@ -9128,7 +9152,7 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
 
 		if (bio_add_page(&bbio->bio, pages[i], bytes, 0) < bytes) {
 			atomic_inc(&priv.pending);
-			btrfs_submit_bio(bbio, 0);
+			btrfs_submit_bbio(bbio, 0);
 
 			bbio = btrfs_bio_alloc(BIO_MAX_VECS, REQ_OP_READ, fs_info,
 					       btrfs_encoded_read_endio, &priv);
@@ -9143,7 +9167,7 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
 	} while (disk_io_size);
 
 	atomic_inc(&priv.pending);
-	btrfs_submit_bio(bbio, 0);
+	btrfs_submit_bbio(bbio, 0);
 
 	if (atomic_dec_return(&priv.pending))
 		io_wait_event(priv.wait, !atomic_read(&priv.pending));