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btrfs: using cached extent_state in set/unlock combinations
In several places the sequence (set_extent_uptodate, unlock_extent) is used. This leads to a duplicate lookup of the extent state. This patch lets set_extent_uptodate return a cached extent_state which can be passed to unlock_extent_cached. The occurences of the above sequences are updated to use the cache. Only end_bio_extent_readpage is updated that it first gets a cached state to pass it to the readpage_end_io_hook as the prototype requested and is later on being used for set/unlock. Signed-off-by: Arne Jansen <sensille@gmx.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
e15d054242
commit
507903b818
3 changed files with 55 additions and 19 deletions
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@ -690,6 +690,17 @@ static void cache_state(struct extent_state *state,
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}
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}
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static void uncache_state(struct extent_state **cached_ptr)
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{
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if (cached_ptr && (*cached_ptr)) {
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struct extent_state *state = *cached_ptr;
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if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) {
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*cached_ptr = NULL;
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free_extent_state(state);
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}
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}
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}
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/*
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* set some bits on a range in the tree. This may require allocations or
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* sleeping, so the gfp mask is used to indicate what is allowed.
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@ -940,10 +951,10 @@ static int clear_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
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}
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int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask)
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struct extent_state **cached_state, gfp_t mask)
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{
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return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL,
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NULL, mask);
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return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0,
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NULL, cached_state, mask);
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}
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static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
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@ -1012,8 +1023,7 @@ int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
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mask);
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}
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int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask)
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int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
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{
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return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
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mask);
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@ -1735,6 +1745,9 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
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do {
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struct page *page = bvec->bv_page;
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struct extent_state *cached = NULL;
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struct extent_state *state;
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tree = &BTRFS_I(page->mapping->host)->io_tree;
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start = ((u64)page->index << PAGE_CACHE_SHIFT) +
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@ -1749,9 +1762,20 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
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if (++bvec <= bvec_end)
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prefetchw(&bvec->bv_page->flags);
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spin_lock(&tree->lock);
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state = find_first_extent_bit_state(tree, start, 0);
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if (state) {
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/*
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* take a reference on the state, unlock will drop
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* the ref
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*/
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cache_state(state, &cached);
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}
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spin_unlock(&tree->lock);
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if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
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ret = tree->ops->readpage_end_io_hook(page, start, end,
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NULL);
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state);
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if (ret)
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uptodate = 0;
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}
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@ -1764,15 +1788,16 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
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test_bit(BIO_UPTODATE, &bio->bi_flags);
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if (err)
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uptodate = 0;
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uncache_state(&cached);
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continue;
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}
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}
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if (uptodate) {
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set_extent_uptodate(tree, start, end,
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set_extent_uptodate(tree, start, end, &cached,
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GFP_ATOMIC);
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}
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unlock_extent(tree, start, end, GFP_ATOMIC);
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unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
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if (whole_page) {
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if (uptodate) {
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@ -1811,6 +1836,7 @@ static void end_bio_extent_preparewrite(struct bio *bio, int err)
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do {
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struct page *page = bvec->bv_page;
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struct extent_state *cached = NULL;
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tree = &BTRFS_I(page->mapping->host)->io_tree;
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start = ((u64)page->index << PAGE_CACHE_SHIFT) +
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@ -1821,13 +1847,14 @@ static void end_bio_extent_preparewrite(struct bio *bio, int err)
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prefetchw(&bvec->bv_page->flags);
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if (uptodate) {
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set_extent_uptodate(tree, start, end, GFP_ATOMIC);
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set_extent_uptodate(tree, start, end, &cached,
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GFP_ATOMIC);
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} else {
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ClearPageUptodate(page);
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SetPageError(page);
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}
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unlock_extent(tree, start, end, GFP_ATOMIC);
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unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
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} while (bvec >= bio->bi_io_vec);
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@ -2016,14 +2043,17 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
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while (cur <= end) {
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if (cur >= last_byte) {
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char *userpage;
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struct extent_state *cached = NULL;
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iosize = PAGE_CACHE_SIZE - page_offset;
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userpage = kmap_atomic(page, KM_USER0);
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memset(userpage + page_offset, 0, iosize);
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flush_dcache_page(page);
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kunmap_atomic(userpage, KM_USER0);
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set_extent_uptodate(tree, cur, cur + iosize - 1,
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GFP_NOFS);
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unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
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&cached, GFP_NOFS);
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unlock_extent_cached(tree, cur, cur + iosize - 1,
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&cached, GFP_NOFS);
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break;
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}
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em = get_extent(inode, page, page_offset, cur,
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@ -2063,14 +2093,17 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
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/* we've found a hole, just zero and go on */
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if (block_start == EXTENT_MAP_HOLE) {
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char *userpage;
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struct extent_state *cached = NULL;
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userpage = kmap_atomic(page, KM_USER0);
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memset(userpage + page_offset, 0, iosize);
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flush_dcache_page(page);
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kunmap_atomic(userpage, KM_USER0);
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set_extent_uptodate(tree, cur, cur + iosize - 1,
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GFP_NOFS);
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unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
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&cached, GFP_NOFS);
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unlock_extent_cached(tree, cur, cur + iosize - 1,
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&cached, GFP_NOFS);
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cur = cur + iosize;
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page_offset += iosize;
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continue;
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@ -2789,9 +2822,12 @@ int extent_prepare_write(struct extent_io_tree *tree,
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iocount++;
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block_start = block_start + iosize;
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} else {
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set_extent_uptodate(tree, block_start, cur_end,
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struct extent_state *cached = NULL;
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set_extent_uptodate(tree, block_start, cur_end, &cached,
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GFP_NOFS);
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unlock_extent(tree, block_start, cur_end, GFP_NOFS);
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unlock_extent_cached(tree, block_start, cur_end,
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&cached, GFP_NOFS);
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block_start = cur_end + 1;
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}
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page_offset = block_start & (PAGE_CACHE_SIZE - 1);
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@ -3457,7 +3493,7 @@ int set_extent_buffer_uptodate(struct extent_io_tree *tree,
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num_pages = num_extent_pages(eb->start, eb->len);
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set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
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GFP_NOFS);
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NULL, GFP_NOFS);
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for (i = 0; i < num_pages; i++) {
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page = extent_buffer_page(eb, i);
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if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) ||
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@ -208,7 +208,7 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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int bits, int exclusive_bits, u64 *failed_start,
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask);
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struct extent_state **cached_state, gfp_t mask);
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int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
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@ -5226,7 +5226,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
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btrfs_mark_buffer_dirty(leaf);
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}
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set_extent_uptodate(io_tree, em->start,
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extent_map_end(em) - 1, GFP_NOFS);
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extent_map_end(em) - 1, NULL, GFP_NOFS);
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goto insert;
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} else {
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printk(KERN_ERR "btrfs unknown found_type %d\n", found_type);
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