forked from luck/tmp_suning_uos_patched
btrfs: cleanup for open-coded alignment
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 <dave@jikos.cz>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Qu Wenruo
Josef Bacik
parent
8c4ce81e91
commit
fda2832feb
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@ -3431,7 +3431,7 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
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int ret = 0, committed = 0, alloc_chunk = 1;
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/* make sure bytes are sectorsize aligned */
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bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
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bytes = ALIGN(bytes, root->sectorsize);
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if (root == root->fs_info->tree_root ||
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BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID) {
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@ -3526,7 +3526,7 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes)
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struct btrfs_space_info *data_sinfo;
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/* make sure bytes are sectorsize aligned */
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bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
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bytes = ALIGN(bytes, root->sectorsize);
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data_sinfo = root->fs_info->data_sinfo;
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spin_lock(&data_sinfo->lock);
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@ -5607,10 +5607,7 @@ static u64 stripe_align(struct btrfs_root *root,
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struct btrfs_block_group_cache *cache,
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u64 val, u64 num_bytes)
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{
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u64 mask;
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u64 ret;
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mask = ((u64)root->stripesize - 1);
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ret = (val + mask) & ~mask;
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u64 ret = ALIGN(val, root->stripesize);
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return ret;
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}
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@ -2686,7 +2686,7 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
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iosize = min(extent_map_end(em) - cur, end - cur + 1);
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cur_end = min(extent_map_end(em) - 1, end);
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iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1);
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iosize = ALIGN(iosize, blocksize);
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if (this_bio_flag & EXTENT_BIO_COMPRESSED) {
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disk_io_size = em->block_len;
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sector = em->block_start >> 9;
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@ -2977,7 +2977,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
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BUG_ON(extent_map_end(em) <= cur);
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BUG_ON(end < cur);
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iosize = min(extent_map_end(em) - cur, end - cur + 1);
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iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1);
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iosize = ALIGN(iosize, blocksize);
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sector = (em->block_start + extent_offset) >> 9;
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bdev = em->bdev;
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block_start = em->block_start;
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@ -3664,7 +3664,7 @@ int extent_invalidatepage(struct extent_io_tree *tree,
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u64 end = start + PAGE_CACHE_SIZE - 1;
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size_t blocksize = page->mapping->host->i_sb->s_blocksize;
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start += (offset + blocksize - 1) & ~(blocksize - 1);
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start += ALIGN(offset, blocksize);
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if (start > end)
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return 0;
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@ -3783,7 +3783,7 @@ static struct extent_map *get_extent_skip_holes(struct inode *inode,
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len = last - offset;
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if (len == 0)
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break;
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len = (len + sectorsize - 1) & ~(sectorsize - 1);
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len = ALIGN(len, sectorsize);
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em = get_extent(inode, NULL, 0, offset, len, 0);
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if (IS_ERR_OR_NULL(em))
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return em;
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@ -510,8 +510,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
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loff_t isize = i_size_read(inode);
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start_pos = pos & ~((u64)root->sectorsize - 1);
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num_bytes = (write_bytes + pos - start_pos +
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root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
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num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize);
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end_of_last_block = start_pos + num_bytes - 1;
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err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block,
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@ -233,8 +233,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
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u64 isize = i_size_read(inode);
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u64 actual_end = min(end + 1, isize);
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u64 inline_len = actual_end - start;
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u64 aligned_end = (end + root->sectorsize - 1) &
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~((u64)root->sectorsize - 1);
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u64 aligned_end = ALIGN(end, root->sectorsize);
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u64 data_len = inline_len;
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int ret;
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@ -391,7 +390,7 @@ static noinline int compress_file_range(struct inode *inode,
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* a compressed extent to 128k.
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*/
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total_compressed = min(total_compressed, max_uncompressed);
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num_bytes = (end - start + blocksize) & ~(blocksize - 1);
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num_bytes = ALIGN(end - start + 1, blocksize);
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num_bytes = max(blocksize, num_bytes);
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total_in = 0;
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ret = 0;
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@ -490,15 +489,13 @@ static noinline int compress_file_range(struct inode *inode,
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* up to a block size boundary so the allocator does sane
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* things
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*/
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total_compressed = (total_compressed + blocksize - 1) &
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~(blocksize - 1);
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total_compressed = ALIGN(total_compressed, blocksize);
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/*
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* one last check to make sure the compression is really a
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* win, compare the page count read with the blocks on disk
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*/
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total_in = (total_in + PAGE_CACHE_SIZE - 1) &
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~(PAGE_CACHE_SIZE - 1);
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total_in = ALIGN(total_in, PAGE_CACHE_SIZE);
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if (total_compressed >= total_in) {
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will_compress = 0;
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} else {
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@ -856,7 +853,7 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
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BUG_ON(btrfs_is_free_space_inode(inode));
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num_bytes = (end - start + blocksize) & ~(blocksize - 1);
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num_bytes = ALIGN(end - start + 1, blocksize);
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num_bytes = max(blocksize, num_bytes);
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disk_num_bytes = num_bytes;
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@ -4015,7 +4012,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
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u64 extent_num_bytes = 0;
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u64 extent_offset = 0;
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u64 item_end = 0;
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u64 mask = root->sectorsize - 1;
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u32 found_type = (u8)-1;
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int found_extent;
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int del_item;
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@ -4039,7 +4035,8 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
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* extent just the way it is.
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*/
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if (root->ref_cows || root == root->fs_info->tree_root)
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btrfs_drop_extent_cache(inode, (new_size + mask) & (~mask), (u64)-1, 0);
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btrfs_drop_extent_cache(inode, ALIGN(new_size,
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root->sectorsize), (u64)-1, 0);
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/*
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* This function is also used to drop the items in the log tree before
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@ -4118,10 +4115,9 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
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if (!del_item) {
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u64 orig_num_bytes =
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btrfs_file_extent_num_bytes(leaf, fi);
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extent_num_bytes = new_size -
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found_key.offset + root->sectorsize - 1;
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extent_num_bytes = extent_num_bytes &
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~((u64)root->sectorsize - 1);
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extent_num_bytes = ALIGN(new_size -
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found_key.offset,
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root->sectorsize);
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btrfs_set_file_extent_num_bytes(leaf, fi,
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extent_num_bytes);
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num_dec = (orig_num_bytes -
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@ -4357,9 +4353,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
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struct extent_map *em = NULL;
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struct extent_state *cached_state = NULL;
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struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
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u64 mask = root->sectorsize - 1;
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u64 hole_start = (oldsize + mask) & ~mask;
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u64 block_end = (size + mask) & ~mask;
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u64 hole_start = ALIGN(oldsize, root->sectorsize);
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u64 block_end = ALIGN(size, root->sectorsize);
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u64 last_byte;
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u64 cur_offset;
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u64 hole_size;
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@ -4392,7 +4387,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
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break;
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}
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last_byte = min(extent_map_end(em), block_end);
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last_byte = (last_byte + mask) & ~mask;
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last_byte = ALIGN(last_byte , root->sectorsize);
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if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
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struct extent_map *hole_em;
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hole_size = last_byte - cur_offset;
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@ -6111,8 +6106,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
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} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
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size_t size;
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size = btrfs_file_extent_inline_len(leaf, item);
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extent_end = (extent_start + size + root->sectorsize - 1) &
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~((u64)root->sectorsize - 1);
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extent_end = ALIGN(extent_start + size, root->sectorsize);
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}
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if (start >= extent_end) {
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@ -6184,8 +6178,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
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copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
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size - extent_offset);
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em->start = extent_start + extent_offset;
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em->len = (copy_size + root->sectorsize - 1) &
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~((u64)root->sectorsize - 1);
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em->len = ALIGN(copy_size, root->sectorsize);
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em->orig_block_len = em->len;
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em->orig_start = em->start;
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if (compress_type) {
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@ -484,7 +484,6 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
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struct btrfs_key *key)
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{
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int found_type;
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u64 mask = root->sectorsize - 1;
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u64 extent_end;
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u64 start = key->offset;
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u64 saved_nbytes;
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@ -501,7 +500,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
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extent_end = start + btrfs_file_extent_num_bytes(eb, item);
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else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
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size = btrfs_file_extent_inline_len(eb, item);
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extent_end = (start + size + mask) & ~mask;
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extent_end = ALIGN(start + size, root->sectorsize);
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} else {
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ret = 0;
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goto out;
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@ -4556,8 +4556,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
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num_stripes = 1;
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stripe_index = 0;
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stripe_nr_orig = stripe_nr;
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stripe_nr_end = (offset + *length + map->stripe_len - 1) &
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(~(map->stripe_len - 1));
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stripe_nr_end = ALIGN(offset + *length, map->stripe_len);
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do_div(stripe_nr_end, map->stripe_len);
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stripe_end_offset = stripe_nr_end * map->stripe_len -
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(offset + *length);
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