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Violators will be prosecuted for from ; Mon, 4 Jul 2016 00:36:01 -0400 From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, dsterba@suse.com Cc: Chandan Rajendra , linux-btrfs@vger.kernel.org Subject: [PATCH V20 16/19] Btrfs: subpage-blocksize: Make file extent relocate code subpage blocksize aware Date: Mon, 4 Jul 2016 10:04:36 +0530 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> Message-Id: <1467606879-14181-17-git-send-email-chandan@linux.vnet.ibm.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: The file extent relocation code currently assumes blocksize to be same as PAGE_SIZE. This commit adds code to support subpage blocksize scenario. Signed-off-by: Chandan Rajendra --- fs/btrfs/relocation.c | 89 ++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 70 insertions(+), 19 deletions(-) diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 05b88f8..fc0ac5d 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -3106,14 +3106,19 @@ static int relocate_file_extent_cluster(struct inode *inode, { u64 page_start; u64 page_end; + u64 block_start; u64 offset = BTRFS_I(inode)->index_cnt; + u64 blocksize = BTRFS_I(inode)->root->sectorsize; + u64 reserved_space; unsigned long index; unsigned long last_index; struct page *page; struct file_ra_state *ra; gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); + int nr_blocks; int nr = 0; int ret = 0; + int i; if (!cluster->nr) return 0; @@ -3133,13 +3138,19 @@ static int relocate_file_extent_cluster(struct inode *inode, if (ret) goto out; + page_start = cluster->start - offset; + page_end = min_t(u64, round_down(page_start, PAGE_SIZE) + PAGE_SIZE - 1, + cluster->end - offset); + index = (cluster->start - offset) >> PAGE_SHIFT; last_index = (cluster->end - offset) >> PAGE_SHIFT; while (index <= last_index) { - ret = btrfs_delalloc_reserve_metadata(inode, PAGE_SIZE); + reserved_space = page_end - page_start + 1; + + ret = btrfs_delalloc_reserve_metadata(inode, reserved_space); if (ret) goto out; - +again: page = find_lock_page(inode->i_mapping, index); if (!page) { page_cache_sync_readahead(inode->i_mapping, @@ -3149,7 +3160,7 @@ static int relocate_file_extent_cluster(struct inode *inode, mask); if (!page) { btrfs_delalloc_release_metadata(inode, - PAGE_SIZE); + reserved_space); ret = -ENOMEM; goto out; } @@ -3161,6 +3172,37 @@ static int relocate_file_extent_cluster(struct inode *inode, last_index + 1 - index); } + if (PageDirty(page)) { + u64 pg_offset = page_offset(page); + + unlock_page(page); + put_page(page); + ret = btrfs_fdatawrite_range(inode, pg_offset, + page_start - 1); + if (ret) { + btrfs_delalloc_release_metadata(inode, + reserved_space); + goto out; + } + + ret = filemap_fdatawait_range(inode->i_mapping, + pg_offset, page_start - 1); + if (ret) { + btrfs_delalloc_release_metadata(inode, + reserved_space); + goto out; + } + + goto again; + } + + if (BTRFS_I(inode)->root->sectorsize < PAGE_SIZE) { + ClearPageUptodate(page); + if (page->private) + clear_page_blks_state(page, 1 << BLK_STATE_UPTODATE, + page_start, page_end); + } + if (!PageUptodate(page)) { btrfs_readpage(NULL, page); lock_page(page); @@ -3168,41 +3210,50 @@ static int relocate_file_extent_cluster(struct inode *inode, unlock_page(page); put_page(page); btrfs_delalloc_release_metadata(inode, - PAGE_SIZE); + reserved_space); ret = -EIO; goto out; } } - page_start = page_offset(page); - page_end = page_start + PAGE_SIZE - 1; - lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); set_page_extent_mapped(page); - if (nr < cluster->nr && - page_start + offset == cluster->boundary[nr]) { - set_extent_bits(&BTRFS_I(inode)->io_tree, - page_start, page_end, - EXTENT_BOUNDARY); - nr++; + nr_blocks = (page_end + 1 - page_start) >> inode->i_blkbits; + + block_start = page_start; + for (i = 0; i < nr_blocks; i++) { + if (nr < cluster->nr && + block_start + offset == cluster->boundary[nr]) { + set_extent_bits(&BTRFS_I(inode)->io_tree, + block_start, block_start + blocksize - 1, + EXTENT_BOUNDARY); + nr++; + } + + block_start += blocksize; } btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); - set_page_blks_state(page, - 1 << BLK_STATE_DIRTY | 1 << BLK_STATE_UPTODATE, - page_start, page_end); - set_page_dirty(page); + if (blocksize < PAGE_SIZE) + set_page_blks_state(page, + 1 << BLK_STATE_DIRTY | 1 << BLK_STATE_UPTODATE, + page_start, page_end); - unlock_extent(&BTRFS_I(inode)->io_tree, - page_start, page_end); + unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); + + set_page_dirty(page); unlock_page(page); put_page(page); index++; balance_dirty_pages_ratelimited(inode->i_mapping); btrfs_throttle(BTRFS_I(inode)->root); + + page_start = page_end + 1; + page_end = min_t(u64, page_start + PAGE_SIZE - 1, + cluster->end - offset); } WARN_ON(nr != cluster->nr); out: -- 2.5.5