From patchwork Tue Feb 26 08:10:22 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 2184571 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id C747FDF215 for ; Tue, 26 Feb 2013 08:10:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758511Ab3BZIKE (ORCPT ); Tue, 26 Feb 2013 03:10:04 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:24352 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757194Ab3BZIKC (ORCPT ); Tue, 26 Feb 2013 03:10:02 -0500 X-IronPort-AV: E=Sophos;i="4.84,739,1355068800"; d="scan'208";a="6771165" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 26 Feb 2013 16:07:38 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id r1Q89wC5018857; Tue, 26 Feb 2013 16:09:58 +0800 Received: from localhost.localdomain ([10.167.226.123]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2013022616090919-416608 ; Tue, 26 Feb 2013 16:09:09 +0800 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: David Sterba Subject: [PATCH] btrfs: cleanup for open-coded alignment Date: Tue, 26 Feb 2013 16:10:22 +0800 Message-Id: <1361866222-5746-1-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 1.8.1.4 X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/02/26 16:09:09, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/02/26 16:09:09, Serialize complete at 2013/02/26 16:09:09 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Though most of the btrfs codes are using ALIGN macro for page alignment, there are still some codes using open-coded alignment like the following: ------ u64 mask = ((u64)root->stripesize - 1); u64 ret = (val + mask) & ~mask; ------ Or even hidden one: ------ num_bytes = (end - start + blocksize) & ~(blocksize - 1); ------ Sometimes these open-coded alignment is not so easy to understand for newbie like me. This commit changes the open-coded alignment to the ALIGN macro for a better readability. Also there is a previous patch from David Sterba with similar changes, but the patch is for 3.2 kernel and seems not merged. http://www.spinics.net/lists/linux-btrfs/msg12747.html Cc: David Sterba Signed-off-by: Qu Wenruo Reviewed-by: Zach Brown --- fs/btrfs/extent-tree.c | 7 +++---- fs/btrfs/extent_io.c | 8 ++++---- fs/btrfs/file.c | 3 +-- fs/btrfs/inode.c | 37 +++++++++++++++---------------------- fs/btrfs/tree-log.c | 3 +-- fs/btrfs/volumes.c | 3 +-- 6 files changed, 25 insertions(+), 36 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 61da9d0..6af2ef6 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3357,7 +3357,7 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes) int ret = 0, committed = 0, alloc_chunk = 1; /* make sure bytes are sectorsize aligned */ - bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); + bytes = ALIGN(bytes, root->sectorsize); if (root == root->fs_info->tree_root || BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) { @@ -3452,7 +3452,7 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes) struct btrfs_space_info *data_sinfo; /* make sure bytes are sectorsize aligned */ - bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1); + bytes = ALIGN(bytes, root->sectorsize); data_sinfo = root->fs_info->data_sinfo; spin_lock(&data_sinfo->lock); @@ -5455,8 +5455,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, static u64 stripe_align(struct btrfs_root *root, u64 val) { - u64 mask = ((u64)root->stripesize - 1); - u64 ret = (val + mask) & ~mask; + u64 ret = ALIGN(val, root->stripesize); return ret; } diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 1b319df..17fa84b 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2682,7 +2682,7 @@ static int __extent_read_full_page(struct extent_io_tree *tree, iosize = min(extent_map_end(em) - cur, end - cur + 1); cur_end = min(extent_map_end(em) - 1, end); - iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); + iosize = ALIGN(iosize, blocksize); if (this_bio_flag & EXTENT_BIO_COMPRESSED) { disk_io_size = em->block_len; sector = em->block_start >> 9; @@ -2982,7 +2982,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, BUG_ON(extent_map_end(em) <= cur); BUG_ON(end < cur); iosize = min(extent_map_end(em) - cur, end - cur + 1); - iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); + iosize = ALIGN(iosize, blocksize); sector = (em->block_start + extent_offset) >> 9; bdev = em->bdev; block_start = em->block_start; @@ -3678,7 +3678,7 @@ int extent_invalidatepage(struct extent_io_tree *tree, u64 end = start + PAGE_CACHE_SIZE - 1; size_t blocksize = page->mapping->host->i_sb->s_blocksize; - start += (offset + blocksize - 1) & ~(blocksize - 1); + start += ALIGN(offset, blocksize); if (start > end) return 0; @@ -3797,7 +3797,7 @@ static struct extent_map *get_extent_skip_holes(struct inode *inode, len = last - offset; if (len == 0) break; - len = (len + sectorsize - 1) & ~(sectorsize - 1); + len = ALIGN(len, sectorsize); em = get_extent(inode, NULL, 0, offset, len, 0); if (IS_ERR_OR_NULL(em)) return em; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index b06d289..81d6271 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -505,8 +505,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, loff_t isize = i_size_read(inode); start_pos = pos & ~((u64)root->sectorsize - 1); - num_bytes = (write_bytes + pos - start_pos + - root->sectorsize - 1) & ~((u64)root->sectorsize - 1); + num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize); end_of_last_block = start_pos + num_bytes - 1; err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index ca7ace7..bde8f08 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -231,8 +231,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, u64 isize = i_size_read(inode); u64 actual_end = min(end + 1, isize); u64 inline_len = actual_end - start; - u64 aligned_end = (end + root->sectorsize - 1) & - ~((u64)root->sectorsize - 1); + u64 aligned_end = ALIGN(end, root->sectorsize); u64 data_len = inline_len; int ret; @@ -389,7 +388,7 @@ again: * a compressed extent to 128k. */ total_compressed = min(total_compressed, max_uncompressed); - num_bytes = (end - start + blocksize) & ~(blocksize - 1); + num_bytes = ALIGN(end - start + 1, blocksize); num_bytes = max(blocksize, num_bytes); total_in = 0; ret = 0; @@ -488,15 +487,13 @@ cont: * up to a block size boundary so the allocator does sane * things */ - total_compressed = (total_compressed + blocksize - 1) & - ~(blocksize - 1); + total_compressed = ALIGN(total_compressed, blocksize); /* * one last check to make sure the compression is really a * win, compare the page count read with the blocks on disk */ - total_in = (total_in + PAGE_CACHE_SIZE - 1) & - ~(PAGE_CACHE_SIZE - 1); + total_in = ALIGN(total_in, PAGE_CACHE_SIZE); if (total_compressed >= total_in) { will_compress = 0; } else { @@ -834,7 +831,7 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans, BUG_ON(btrfs_is_free_space_inode(inode)); - num_bytes = (end - start + blocksize) & ~(blocksize - 1); + num_bytes = ALIGN(end - start + 1, blocksize); num_bytes = max(blocksize, num_bytes); disk_num_bytes = num_bytes; @@ -3304,7 +3301,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, u64 extent_num_bytes = 0; u64 extent_offset = 0; u64 item_end = 0; - u64 mask = root->sectorsize - 1; u32 found_type = (u8)-1; int found_extent; int del_item; @@ -3328,7 +3324,8 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, * extent just the way it is. */ if (root->ref_cows || root == root->fs_info->tree_root) - btrfs_drop_extent_cache(inode, (new_size + mask) & (~mask), (u64)-1, 0); + btrfs_drop_extent_cache(inode, ALIGN(new_size, + root->sectorsize), (u64)-1, 0); /* * This function is also used to drop the items in the log tree before @@ -3407,10 +3404,9 @@ search_again: if (!del_item) { u64 orig_num_bytes = btrfs_file_extent_num_bytes(leaf, fi); - extent_num_bytes = new_size - - found_key.offset + root->sectorsize - 1; - extent_num_bytes = extent_num_bytes & - ~((u64)root->sectorsize - 1); + extent_num_bytes = ALIGN(new_size - + found_key.offset, + root->sectorsize); btrfs_set_file_extent_num_bytes(leaf, fi, extent_num_bytes); num_dec = (orig_num_bytes - @@ -3646,9 +3642,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) struct extent_map *em = NULL; struct extent_state *cached_state = NULL; struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; - u64 mask = root->sectorsize - 1; - u64 hole_start = (oldsize + mask) & ~mask; - u64 block_end = (size + mask) & ~mask; + u64 hole_start = ALIGN(oldsize, root->sectorsize); + u64 block_end = ALIGN(size, root->sectorsize); u64 last_byte; u64 cur_offset; u64 hole_size; @@ -3681,7 +3676,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) break; } last_byte = min(extent_map_end(em), block_end); - last_byte = (last_byte + mask) & ~mask; + last_byte = ALIGN(last_byte , root->sectorsize); if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { struct extent_map *hole_em; hole_size = last_byte - cur_offset; @@ -5410,8 +5405,7 @@ again: } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { size_t size; size = btrfs_file_extent_inline_len(leaf, item); - extent_end = (extent_start + size + root->sectorsize - 1) & - ~((u64)root->sectorsize - 1); + extent_end = ALIGN(extent_start + size, root->sectorsize); } if (start >= extent_end) { @@ -5483,8 +5477,7 @@ again: copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, size - extent_offset); em->start = extent_start + extent_offset; - em->len = (copy_size + root->sectorsize - 1) & - ~((u64)root->sectorsize - 1); + em->len = ALIGN(copy_size, root->sectorsize); em->orig_block_len = em->len; em->orig_start = em->start; if (compress_type) { diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 9027bb1..7a8a6f1 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -485,7 +485,6 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, struct btrfs_key *key) { int found_type; - u64 mask = root->sectorsize - 1; u64 extent_end; u64 start = key->offset; u64 saved_nbytes; @@ -502,7 +501,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, extent_end = start + btrfs_file_extent_num_bytes(eb, item); else if (found_type == BTRFS_FILE_EXTENT_INLINE) { size = btrfs_file_extent_inline_len(eb, item); - extent_end = (start + size + mask) & ~mask; + extent_end = ALIGN(start + size, root->sectorsize); } else { ret = 0; goto out; diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 5349e17..a0cc823 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4279,8 +4279,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, num_stripes = 1; stripe_index = 0; stripe_nr_orig = stripe_nr; - stripe_nr_end = (offset + *length + map->stripe_len - 1) & - (~(map->stripe_len - 1)); + stripe_nr_end = ALIGN(offset + *length, map->stripe_len); do_div(stripe_nr_end, map->stripe_len); stripe_end_offset = stripe_nr_end * map->stripe_len - (offset + *length);