In subpage-blocksize scenario, extent allocations for only some of the dirty blocks of a page can succeed, while allocation for rest of the blocks can fail. This patch allows I/O against such pages to be submitted.
Signed-off-by: Chandan Rajendra <chan...@linux.vnet.ibm.com> --- fs/btrfs/extent_io.c | 27 ++++++++++++++------------- fs/btrfs/inode.c | 39 ++++++++++++++++++++++++++------------- 2 files changed, 40 insertions(+), 26 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 0465311..74e27f9 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1863,17 +1863,23 @@ void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, if (page_ops & PAGE_SET_PRIVATE2) SetPagePrivate2(pages[i]); + if (page_ops & PAGE_SET_ERROR) + SetPageError(pages[i]); + if (pages[i] == locked_page) { put_page(pages[i]); continue; } - if (page_ops & PAGE_CLEAR_DIRTY) + + if ((page_ops & PAGE_CLEAR_DIRTY) + && !PagePrivate2(pages[i])) clear_page_dirty_for_io(pages[i]); - if (page_ops & PAGE_SET_WRITEBACK) + if ((page_ops & PAGE_SET_WRITEBACK) + && !PagePrivate2(pages[i])) set_page_writeback(pages[i]); - if (page_ops & PAGE_SET_ERROR) - SetPageError(pages[i]); - if (page_ops & PAGE_END_WRITEBACK) + + if ((page_ops & PAGE_END_WRITEBACK) + && !PagePrivate2(pages[i])) end_page_writeback(pages[i]); if (page_ops & PAGE_UNLOCK) unlock_page(pages[i]); @@ -2565,7 +2571,7 @@ void end_extent_writepage(struct page *page, int err, u64 start, u64 end) uptodate = 0; } - if (!uptodate) { + if (!uptodate || PageError(page)) { ClearPageUptodate(page); SetPageError(page); ret = ret < 0 ? ret : -EIO; @@ -3420,7 +3426,6 @@ static noinline_for_stack int writepage_delalloc(struct inode *inode, nr_written); /* File system has been set read-only */ if (ret) { - SetPageError(page); /* fill_delalloc should be return < 0 for error * but just in case, we use > 0 here meaning the * IO is started, so we don't want to return > 0 @@ -3641,7 +3646,6 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, struct inode *inode = page->mapping->host; struct extent_page_data *epd = data; u64 start = page_offset(page); - u64 page_end = start + PAGE_SIZE - 1; int ret; int nr = 0; size_t pg_offset = 0; @@ -3686,7 +3690,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); if (ret == 1) goto done_unlocked; - if (ret) + if (ret && !PagePrivate2(page)) goto done; ret = __extent_writepage_io(inode, page, wbc, epd, @@ -3700,10 +3704,7 @@ done: set_page_writeback(page); end_page_writeback(page); } - if (PageError(page)) { - ret = ret < 0 ? ret : -EIO; - end_extent_writepage(page, ret, start, page_end); - } + unlock_page(page); return ret; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e85865b..a6bb415 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -943,6 +943,8 @@ static noinline int cow_file_range(struct inode *inode, struct btrfs_key ins; struct extent_map *em; struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; + struct btrfs_ordered_extent *ordered; + unsigned long page_ops, extent_ops; int ret = 0; if (btrfs_is_free_space_inode(inode)) { @@ -987,8 +989,6 @@ static noinline int cow_file_range(struct inode *inode, btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); while (disk_num_bytes > 0) { - unsigned long op; - cur_alloc_size = disk_num_bytes; ret = btrfs_reserve_extent(root, cur_alloc_size, root->sectorsize, 0, alloc_hint, @@ -1041,7 +1041,7 @@ static noinline int cow_file_range(struct inode *inode, ret = btrfs_reloc_clone_csums(inode, start, cur_alloc_size); if (ret) - goto out_drop_extent_cache; + goto out_remove_ordered_extent; } btrfs_dec_block_group_reservations(root->fs_info, ins.objectid); @@ -1056,13 +1056,12 @@ static noinline int cow_file_range(struct inode *inode, * Do set the Private2 bit so we know this page was properly * setup for writepage */ - op = unlock ? PAGE_UNLOCK : 0; - op |= PAGE_SET_PRIVATE2; - + page_ops = unlock ? PAGE_UNLOCK : 0; + page_ops |= PAGE_SET_PRIVATE2; + extent_ops = EXTENT_LOCKED | EXTENT_DELALLOC; extent_clear_unlock_delalloc(inode, start, - start + ram_size - 1, locked_page, - EXTENT_LOCKED | EXTENT_DELALLOC, - op); + start + ram_size - 1, locked_page, + extent_ops, page_ops); disk_num_bytes -= cur_alloc_size; num_bytes -= cur_alloc_size; alloc_hint = ins.objectid + ins.offset; @@ -1071,17 +1070,31 @@ static noinline int cow_file_range(struct inode *inode, out: return ret; +out_remove_ordered_extent: + ordered = btrfs_lookup_ordered_extent(inode, start); + BUG_ON(!ordered); + btrfs_remove_ordered_extent(inode, ordered); + /* once for us */ + btrfs_put_ordered_extent(ordered); + /* once for the tree */ + btrfs_put_ordered_extent(ordered); + out_drop_extent_cache: btrfs_drop_extent_cache(inode, start, start + ram_size - 1, 0); + out_reserve: btrfs_dec_block_group_reservations(root->fs_info, ins.objectid); btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); + out_unlock: + page_ops = unlock ? PAGE_UNLOCK : 0; + page_ops |= PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK + | PAGE_SET_ERROR; + extent_ops = EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING + | EXTENT_DEFRAG; + extent_clear_unlock_delalloc(inode, start, end, locked_page, - EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | - EXTENT_DELALLOC | EXTENT_DEFRAG, - PAGE_UNLOCK | PAGE_CLEAR_DIRTY | - PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK); + extent_ops, page_ops); goto out; } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html