From patchwork Mon Jul 4 04:34:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 9211597 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AC5FF6086B for ; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A00DE28625 for ; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 949FF28638; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E7C228625 for ; Mon, 4 Jul 2016 04:35:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752749AbcGDEfm (ORCPT ); Mon, 4 Jul 2016 00:35:42 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:10101 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752512AbcGDEfi (ORCPT ); Mon, 4 Jul 2016 00:35:38 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u644Xe8m093755 for ; Mon, 4 Jul 2016 00:35:37 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 23x7ruh1nh-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 04 Jul 2016 00:35:37 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 3 Jul 2016 22:35:34 -0600 X-IBM-Helo: d03dlp02.boulder.ibm.com X-IBM-MailFrom: chandan@linux.vnet.ibm.com Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id A98DB3E40030; Sun, 3 Jul 2016 22:35:33 -0600 (MDT) Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u644ZX4955443668; Mon, 4 Jul 2016 04:35:33 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3AC80AC040; Mon, 4 Jul 2016 00:35:33 -0400 (EDT) Received: from localhost.in.ibm.com (unknown [9.124.208.86]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP id 2E3F3AC04A; Mon, 4 Jul 2016 00:35:30 -0400 (EDT) From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, dsterba@suse.com Cc: Chandan Rajendra , linux-btrfs@vger.kernel.org Subject: [PATCH V20 09/19] Btrfs: subpage-blocksize: Explicitly track I/O status of blocks of an ordered extent. Date: Mon, 4 Jul 2016 10:04:29 +0530 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1467606879-14181-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1467606879-14181-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16070404-0008-0000-0000-000004F8D361 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16070404-0009-0000-0000-000038FDFFDE Message-Id: <1467606879-14181-10-git-send-email-chandan@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-07-04_02:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1607040043 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In subpage-blocksize scenario a page can have more than one block. So in addition to PagePrivate2 flag, we would have to track the I/O status of each block of a page to reliably mark the ordered extent as complete. Signed-off-by: Chandan Rajendra --- fs/btrfs/extent_io.c | 19 +-- fs/btrfs/extent_io.h | 5 +- fs/btrfs/inode.c | 365 ++++++++++++++++++++++++++++++++++-------------- fs/btrfs/ordered-data.c | 19 +++ fs/btrfs/ordered-data.h | 4 + 5 files changed, 296 insertions(+), 116 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 303b49e..694d2dc 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4661,11 +4661,10 @@ int extent_invalidatepage(struct extent_io_tree *tree, * to drop the page. */ static int try_release_extent_state(struct extent_map_tree *map, - struct extent_io_tree *tree, - struct page *page, gfp_t mask) + struct extent_io_tree *tree, + struct page *page, u64 start, u64 end, + gfp_t mask) { - u64 start = page_offset(page); - u64 end = start + PAGE_SIZE - 1; int ret = 1; if (test_range_bit(tree, start, end, @@ -4699,12 +4698,12 @@ static int try_release_extent_state(struct extent_map_tree *map, * map records are removed */ int try_release_extent_mapping(struct extent_map_tree *map, - struct extent_io_tree *tree, struct page *page, - gfp_t mask) + struct extent_io_tree *tree, struct page *page, + u64 start, u64 end, gfp_t mask) { struct extent_map *em; - u64 start = page_offset(page); - u64 end = start + PAGE_SIZE - 1; + u64 orig_start = start; + u64 orig_end = end; if (gfpflags_allow_blocking(mask) && page->mapping->host->i_size > SZ_16M) { @@ -4738,7 +4737,9 @@ int try_release_extent_mapping(struct extent_map_tree *map, free_extent_map(em); } } - return try_release_extent_state(map, tree, page, mask); + return try_release_extent_state(map, tree, page, + orig_start, orig_end, + mask); } /* diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 91e7a75..2ea8451 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -279,8 +279,9 @@ typedef struct extent_map *(get_extent_t)(struct inode *inode, void extent_io_tree_init(struct extent_io_tree *tree, struct address_space *mapping); int try_release_extent_mapping(struct extent_map_tree *map, - struct extent_io_tree *tree, struct page *page, - gfp_t mask); + struct extent_io_tree *tree, struct page *page, + u64 start, u64 end, + gfp_t mask); int try_release_extent_buffer(struct page *page); int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e9f9bb1..4ae5c25 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3072,56 +3072,119 @@ static void finish_ordered_fn(struct btrfs_work *work) btrfs_finish_ordered_io(ordered_extent); } -static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, - struct extent_state *state, int uptodate) +static void mark_blks_io_complete(struct btrfs_ordered_extent *ordered, + u64 blk, u64 nr_blks, int uptodate) { - struct inode *inode = page->mapping->host; + struct inode *inode = ordered->inode; struct btrfs_root *root = BTRFS_I(inode)->root; - struct btrfs_ordered_extent *ordered_extent = NULL; struct btrfs_workqueue *wq; btrfs_work_func_t func; - u64 ordered_start, ordered_end; int done; - trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); + while (nr_blks--) { + if (test_and_set_bit(blk, ordered->blocks_done)) { + blk++; + continue; + } - ClearPagePrivate2(page); -loop: - ordered_extent = btrfs_lookup_ordered_range(inode, start, - end - start + 1); - if (!ordered_extent) - goto out; + done = btrfs_dec_test_ordered_pending(inode, &ordered, + ordered->file_offset + + (blk << inode->i_blkbits), + root->sectorsize, + uptodate); + if (done) { + if (btrfs_is_free_space_inode(inode)) { + wq = root->fs_info->endio_freespace_worker; + func = btrfs_freespace_write_helper; + } else { + wq = root->fs_info->endio_write_workers; + func = btrfs_endio_write_helper; + } - ordered_start = max_t(u64, start, ordered_extent->file_offset); - ordered_end = min_t(u64, end, - ordered_extent->file_offset + ordered_extent->len - 1); - - done = btrfs_dec_test_ordered_pending(inode, &ordered_extent, - ordered_start, - ordered_end - ordered_start + 1, - uptodate); - if (done) { - if (btrfs_is_free_space_inode(inode)) { - wq = root->fs_info->endio_freespace_worker; - func = btrfs_freespace_write_helper; - } else { - wq = root->fs_info->endio_write_workers; - func = btrfs_endio_write_helper; + btrfs_init_work(&ordered->work, func, + finish_ordered_fn, NULL, NULL); + btrfs_queue_work(wq, &ordered->work); } - btrfs_init_work(&ordered_extent->work, func, - finish_ordered_fn, NULL, NULL); - btrfs_queue_work(wq, &ordered_extent->work); + blk++; } +} - btrfs_put_ordered_extent(ordered_extent); +int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, + struct extent_state *state, int uptodate) +{ + struct inode *inode = page->mapping->host; + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_ordered_extent *ordered_extent = NULL; + u64 blk, nr_blks; + int clear; - start = ordered_end + 1; + trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); - if (start < end) - goto loop; + while (start < end) { + ordered_extent = btrfs_lookup_ordered_extent(inode, start); + if (!ordered_extent) { + start += root->sectorsize; + continue; + } + + blk = BTRFS_BYTES_TO_BLKS(root->fs_info, + start - ordered_extent->file_offset); + + nr_blks = BTRFS_BYTES_TO_BLKS(root->fs_info, + min(end, ordered_extent->file_offset + + ordered_extent->len - 1) + + 1 - start); + + BUG_ON(!nr_blks); + + mark_blks_io_complete(ordered_extent, blk, nr_blks, uptodate); + + start = ordered_extent->file_offset + ordered_extent->len; + + btrfs_put_ordered_extent(ordered_extent); + } + + start = page_offset(page); + end = start + PAGE_SIZE - 1; + clear = 1; + + while (start < end) { + ordered_extent = btrfs_lookup_ordered_extent(inode, start); + if (!ordered_extent) { + start += root->sectorsize; + continue; + } + + blk = BTRFS_BYTES_TO_BLKS(root->fs_info, + start - ordered_extent->file_offset); + nr_blks = BTRFS_BYTES_TO_BLKS(root->fs_info, + min(end, ordered_extent->file_offset + + ordered_extent->len - 1) + + 1 - start); + + BUG_ON(!nr_blks); + + while (nr_blks--) { + if (!test_bit(blk++, ordered_extent->blocks_done)) { + clear = 0; + break; + } + } + + if (!clear) { + btrfs_put_ordered_extent(ordered_extent); + break; + } + + start += ordered_extent->len; + + btrfs_put_ordered_extent(ordered_extent); + } + + if (clear) + ClearPagePrivate2(page); -out: return 0; } @@ -8844,7 +8907,9 @@ btrfs_readpages(struct file *file, struct address_space *mapping, return extent_readpages(tree, mapping, pages, nr_pages, btrfs_get_extent); } -static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) + +static int __btrfs_releasepage(struct page *page, u64 start, u64 end, + gfp_t gfp_flags) { struct extent_io_tree *tree; struct extent_map_tree *map; @@ -8852,34 +8917,151 @@ static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) tree = &BTRFS_I(page->mapping->host)->io_tree; map = &BTRFS_I(page->mapping->host)->extent_tree; - ret = try_release_extent_mapping(map, tree, page, gfp_flags); - if (ret == 1) + + ret = try_release_extent_mapping(map, tree, page, start, end, + gfp_flags); + if ((ret == 1) && ((end - start + 1) == PAGE_SIZE)) { clear_page_extent_mapped(page); + } else { + ret = 0; + } return ret; } static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) { + u64 start = page_offset(page); + u64 end = start + PAGE_SIZE - 1; + if (PageWriteback(page) || PageDirty(page)) return 0; - return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); + + return __btrfs_releasepage(page, start, end, gfp_flags & GFP_NOFS); +} + +static void invalidate_ordered_extent_blocks(struct inode *inode, + struct btrfs_ordered_extent *ordered, + u64 locked_start, u64 locked_end, + u64 cur, + int inode_evicting) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_ordered_inode_tree *ordered_tree; + struct extent_io_tree *tree; + u64 blk, blk_done, nr_blks; + u64 end; + u64 new_len; + + tree = &BTRFS_I(inode)->io_tree; + + end = min(locked_end, ordered->file_offset + ordered->len - 1); + + if (!inode_evicting) { + clear_extent_bit(tree, cur, end, + EXTENT_DIRTY | EXTENT_DELALLOC | + EXTENT_DO_ACCOUNTING | + EXTENT_DEFRAG, 1, 0, NULL, + GFP_NOFS); + unlock_extent(tree, locked_start, locked_end); + } + + + ordered_tree = &BTRFS_I(inode)->ordered_tree; + spin_lock_irq(&ordered_tree->lock); + set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); + new_len = cur - ordered->file_offset; + if (new_len < ordered->truncated_len) + ordered->truncated_len = new_len; + + blk = BTRFS_BYTES_TO_BLKS(root->fs_info, + cur - ordered->file_offset); + nr_blks = BTRFS_BYTES_TO_BLKS(root->fs_info, end + 1 - cur); + + while (nr_blks--) { + blk_done = !test_and_set_bit(blk, ordered->blocks_done); + if (blk_done) { + spin_unlock_irq(&ordered_tree->lock); + if (btrfs_dec_test_ordered_pending(inode, &ordered, + ordered->file_offset + (blk << inode->i_blkbits), + root->sectorsize, + 1)) + btrfs_finish_ordered_io(ordered); + + spin_lock_irq(&ordered_tree->lock); + } + blk++; + } + + spin_unlock_irq(&ordered_tree->lock); + + if (!inode_evicting) + lock_extent_bits(tree, locked_start, locked_end, NULL); +} + +static int page_blocks_written(struct page *page) +{ + struct btrfs_ordered_extent *ordered; + struct btrfs_root *root; + struct inode *inode; + unsigned long outstanding_blk; + u64 page_start, page_end; + u64 blk, last_blk, nr_blks; + u64 cur; + u64 len; + + inode = page->mapping->host; + root = BTRFS_I(inode)->root; + + page_start = page_offset(page); + page_end = page_start + PAGE_SIZE - 1; + + cur = page_start; + while (cur < page_end) { + ordered = btrfs_lookup_ordered_extent(inode, cur); + if (!ordered) { + cur += root->sectorsize; + continue; + } + + blk = BTRFS_BYTES_TO_BLKS(root->fs_info, + cur - ordered->file_offset); + len = min(page_end, ordered->file_offset + ordered->len - 1) + - cur + 1; + nr_blks = BTRFS_BYTES_TO_BLKS(root->fs_info, len); + + last_blk = blk + nr_blks - 1; + + outstanding_blk = find_next_zero_bit(ordered->blocks_done, + BTRFS_BYTES_TO_BLKS(root->fs_info, + ordered->len), + blk); + if (outstanding_blk <= last_blk) { + btrfs_put_ordered_extent(ordered); + return 0; + } + + btrfs_put_ordered_extent(ordered); + cur += len; + } + + return 1; } static void btrfs_invalidatepage(struct page *page, unsigned int offset, - unsigned int length) + unsigned int length) { struct inode *inode = page->mapping->host; struct btrfs_root *root = BTRFS_I(inode)->root; struct extent_io_tree *tree; struct btrfs_ordered_extent *ordered; - struct extent_state *cached_state = NULL; - u64 page_start = page_offset(page); - u64 page_end = page_start + PAGE_SIZE - 1; - u64 start; - u64 end; + u64 start, end, cur; + u64 page_start, page_end; int inode_evicting = inode->i_state & I_FREEING; + page_start = page_offset(page); + page_end = page_start + PAGE_SIZE - 1; + /* * we have the page locked, so new writeback can't start, * and the dirty bit won't be cleared while we are here. @@ -8890,61 +9072,35 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset, wait_on_page_writeback(page); tree = &BTRFS_I(inode)->io_tree; - if (offset) { + + start = round_up(offset, root->sectorsize); + end = round_down(offset + length, root->sectorsize) - 1; + if (end - start + 1 < root->sectorsize) { btrfs_releasepage(page, GFP_NOFS); return; } + start = round_up(page_start + offset, root->sectorsize); + end = round_down(page_start + offset + length, + root->sectorsize) - 1; + if (!inode_evicting) - lock_extent_bits(tree, page_start, page_end, &cached_state); -again: - start = page_start; - ordered = btrfs_lookup_ordered_range(inode, start, - page_end - start + 1); - if (ordered) { - end = min(page_end, ordered->file_offset + ordered->len - 1); - /* - * IO on this page will never be started, so we need - * to account for any ordered extents now - */ - if (!inode_evicting) - clear_extent_bit(tree, start, end, - EXTENT_DIRTY | EXTENT_DELALLOC | - EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | - EXTENT_DEFRAG, 1, 0, &cached_state, - GFP_NOFS); - /* - * whoever cleared the private bit is responsible - * for the finish_ordered_io - */ - if (TestClearPagePrivate2(page)) { - struct btrfs_ordered_inode_tree *tree; - u64 new_len; + lock_extent_bits(tree, start, end, NULL); - tree = &BTRFS_I(inode)->ordered_tree; + cur = start; + while (cur < end) { + ordered = btrfs_lookup_ordered_extent(inode, cur); + if (!ordered) { + cur += root->sectorsize; + continue; + } - spin_lock_irq(&tree->lock); - set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); - new_len = start - ordered->file_offset; - if (new_len < ordered->truncated_len) - ordered->truncated_len = new_len; - spin_unlock_irq(&tree->lock); + invalidate_ordered_extent_blocks(inode, ordered, + start, end, cur, + inode_evicting); - if (btrfs_dec_test_ordered_pending(inode, &ordered, - start, - end - start + 1, 1)) - btrfs_finish_ordered_io(ordered); - } + cur = min(end + 1, ordered->file_offset + ordered->len); btrfs_put_ordered_extent(ordered); - if (!inode_evicting) { - cached_state = NULL; - lock_extent_bits(tree, start, end, - &cached_state); - } - - start = end + 1; - if (start < page_end) - goto again; } /* @@ -8961,27 +9117,26 @@ again: btrfs_qgroup_free_data(inode, page_start, PAGE_SIZE); if (root->sectorsize < PAGE_SIZE) - clear_page_blks_state(page, 1 << BLK_STATE_DIRTY, page_start, - page_end); + clear_page_blks_state(page, 1 << BLK_STATE_DIRTY, start, end); - if (!inode_evicting) { - clear_extent_bit(tree, page_start, page_end, - EXTENT_LOCKED | EXTENT_DIRTY | - EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | - EXTENT_DEFRAG, 1, 1, - &cached_state, GFP_NOFS); + if (page_blocks_written(page)) + ClearPagePrivate2(page); - __btrfs_releasepage(page, GFP_NOFS); + if (!inode_evicting) { + clear_extent_bit(tree, start, end, + EXTENT_LOCKED | EXTENT_DIRTY | + EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | + EXTENT_DEFRAG, 1, 1, NULL, GFP_NOFS); + __btrfs_releasepage(page, start, end, GFP_NOFS); } - ClearPageChecked(page); - if (PagePrivate(page)) { - ClearPagePrivate(page); - set_page_private(page, 0); - put_page(page); + if (!offset && length == PAGE_SIZE) { + ClearPageChecked(page); + clear_page_extent_mapped(page); } } + /* * btrfs_page_mkwrite() is not allowed to change the file size as it gets * called from a page fault handler when a page is first dirtied. Hence we must diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index aca8264..3e0f30d 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -190,12 +190,27 @@ static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, struct btrfs_ordered_inode_tree *tree; struct rb_node *node; struct btrfs_ordered_extent *entry; + u64 nr_longs; + u64 nr_blks; tree = &BTRFS_I(inode)->ordered_tree; entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS); if (!entry) return -ENOMEM; + nr_blks = BTRFS_BYTES_TO_BLKS(root->fs_info, len); + nr_longs = BITS_TO_LONGS(nr_blks); + if (nr_longs == 1) { + entry->blocks_done = &entry->blocks_bitmap; + } else { + entry->blocks_done = kzalloc(nr_longs * sizeof(unsigned long), + GFP_NOFS); + if (!entry->blocks_done) { + kmem_cache_free(btrfs_ordered_extent_cache, entry); + return -ENOMEM; + } + } + entry->file_offset = file_offset; entry->start = start; entry->len = len; @@ -577,6 +592,10 @@ void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry) list_del(&sum->list); kfree(sum); } + + if (entry->blocks_done != &entry->blocks_bitmap) + kfree(entry->blocks_done); + kmem_cache_free(btrfs_ordered_extent_cache, entry); } } diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h index 4515077..2f66f4a 100644 --- a/fs/btrfs/ordered-data.h +++ b/fs/btrfs/ordered-data.h @@ -139,6 +139,10 @@ struct btrfs_ordered_extent { struct completion completion; struct btrfs_work flush_work; struct list_head work_list; + + /* bitmap to track the blocks that have been written to disk */ + unsigned long *blocks_done; + unsigned long blocks_bitmap; }; /*