From: Chris Mason Date: Tue, 29 Jan 2008 14:59:12 +0000 (-0500) Subject: Btrfs: extent_io and extent_state optimizations X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=70dec8079d78691e476cc6c7cede40656078ad30;p=linux-beck.git Btrfs: extent_io and extent_state optimizations The end_bio routines are changed to take a pointer to the extent state struct, and the state tree is walked in order to set/clear appropriate bits as IO completes. This greatly reduces the number of rbtree searches done by the end_bio handlers, and reduces lock contention. The extent_io releasepage function is changed to avoid expensive searches for locked state. Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 4c4ebea0b2a9..e29a0716f6a9 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -274,7 +274,7 @@ int btree_readpage(struct file *file, struct page *page) return extent_read_full_page(tree, page, btree_get_extent); } -static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) +static int btree_releasepage(struct page *page, gfp_t gfp_flags) { struct extent_io_tree *tree; struct extent_map_tree *map; @@ -282,7 +282,7 @@ static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags) tree = &BTRFS_I(page->mapping->host)->io_tree; map = &BTRFS_I(page->mapping->host)->extent_tree; - ret = try_release_extent_mapping(map, tree, page); + ret = try_release_extent_mapping(map, tree, page, gfp_flags); if (ret == 1) { ClearPagePrivate(page); set_page_private(page, 0); diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 15cc158a0498..1f734c34dc24 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -27,13 +27,11 @@ static struct kmem_cache *extent_buffer_cache; static LIST_HEAD(buffers); static LIST_HEAD(states); -static spinlock_t state_lock = SPIN_LOCK_UNLOCKED; #define BUFFER_LRU_MAX 64 struct tree_entry { u64 start; u64 end; - int in_tree; struct rb_node rb_node; }; @@ -69,7 +67,7 @@ void extent_io_exit(void) while (!list_empty(&states)) { state = list_entry(states.next, struct extent_state, list); - printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs)); + printk("state leak: start %Lu end %Lu state %lu in tree %p refs %d\n", state->start, state->end, state->state, state->tree, atomic_read(&state->refs)); list_del(&state->list); kmem_cache_free(extent_state_cache, state); @@ -87,7 +85,7 @@ void extent_io_tree_init(struct extent_io_tree *tree, tree->state.rb_node = NULL; tree->ops = NULL; tree->dirty_bytes = 0; - rwlock_init(&tree->lock); + spin_lock_init(&tree->lock); spin_lock_init(&tree->lru_lock); tree->mapping = mapping; INIT_LIST_HEAD(&tree->buffer_lru); @@ -110,18 +108,13 @@ EXPORT_SYMBOL(extent_io_tree_empty_lru); struct extent_state *alloc_extent_state(gfp_t mask) { struct extent_state *state; - unsigned long flags; state = kmem_cache_alloc(extent_state_cache, mask); if (!state || IS_ERR(state)) return state; state->state = 0; - state->in_tree = 0; state->private = 0; - - spin_lock_irqsave(&state_lock, flags); - list_add(&state->list, &states); - spin_unlock_irqrestore(&state_lock, flags); + state->tree = NULL; atomic_set(&state->refs, 1); init_waitqueue_head(&state->wq); @@ -131,14 +124,10 @@ EXPORT_SYMBOL(alloc_extent_state); void free_extent_state(struct extent_state *state) { - unsigned long flags; if (!state) return; if (atomic_dec_and_test(&state->refs)) { - WARN_ON(state->in_tree); - spin_lock_irqsave(&state_lock, flags); - list_del(&state->list); - spin_unlock_irqrestore(&state_lock, flags); + WARN_ON(state->tree); kmem_cache_free(extent_state_cache, state); } } @@ -164,7 +153,6 @@ static struct rb_node *tree_insert(struct rb_root *root, u64 offset, } entry = rb_entry(node, struct tree_entry, rb_node); - entry->in_tree = 1; rb_link_node(node, parent, p); rb_insert_color(node, root); return NULL; @@ -216,8 +204,9 @@ static struct rb_node *__tree_search(struct rb_root *root, u64 offset, static inline struct rb_node *tree_search(struct rb_root *root, u64 offset) { - struct rb_node *prev; + struct rb_node *prev = NULL; struct rb_node *ret; + ret = __tree_search(root, offset, &prev, NULL); if (!ret) return prev; @@ -248,7 +237,7 @@ static int merge_state(struct extent_io_tree *tree, if (other->end == state->start - 1 && other->state == state->state) { state->start = other->start; - other->in_tree = 0; + other->tree = NULL; rb_erase(&other->rb_node, &tree->state); free_extent_state(other); } @@ -259,7 +248,7 @@ static int merge_state(struct extent_io_tree *tree, if (other->start == state->end + 1 && other->state == state->state) { other->start = state->start; - state->in_tree = 0; + state->tree = NULL; rb_erase(&state->rb_node, &tree->state); free_extent_state(state); } @@ -300,6 +289,7 @@ static int insert_state(struct extent_io_tree *tree, free_extent_state(state); return -EEXIST; } + state->tree = tree; merge_state(tree, state); return 0; } @@ -335,6 +325,7 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig, free_extent_state(prealloc); return -EEXIST; } + prealloc->tree = tree; return 0; } @@ -361,9 +352,9 @@ static int clear_state_bit(struct extent_io_tree *tree, if (wake) wake_up(&state->wq); if (delete || state->state == 0) { - if (state->in_tree) { + if (state->tree) { rb_erase(&state->rb_node, &tree->state); - state->in_tree = 0; + state->tree = NULL; free_extent_state(state); } else { WARN_ON(1); @@ -404,7 +395,7 @@ again: return -ENOMEM; } - write_lock_irqsave(&tree->lock, flags); + spin_lock_irqsave(&tree->lock, flags); /* * this search will find the extents that end after * our range starts @@ -434,6 +425,8 @@ again: */ if (state->start < start) { + if (!prealloc) + prealloc = alloc_extent_state(GFP_ATOMIC); err = split_state(tree, state, prealloc, start); BUG_ON(err == -EEXIST); prealloc = NULL; @@ -455,6 +448,8 @@ again: * on the first half */ if (state->start <= end && state->end > end) { + if (!prealloc) + prealloc = alloc_extent_state(GFP_ATOMIC); err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); @@ -471,7 +466,7 @@ again: goto search_again; out: - write_unlock_irqrestore(&tree->lock, flags); + spin_unlock_irqrestore(&tree->lock, flags); if (prealloc) free_extent_state(prealloc); @@ -480,7 +475,7 @@ out: search_again: if (start > end) goto out; - write_unlock_irqrestore(&tree->lock, flags); + spin_unlock_irqrestore(&tree->lock, flags); if (mask & __GFP_WAIT) cond_resched(); goto again; @@ -492,9 +487,9 @@ static int wait_on_state(struct extent_io_tree *tree, { DEFINE_WAIT(wait); prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); - read_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); schedule(); - read_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); finish_wait(&state->wq, &wait); return 0; } @@ -509,7 +504,7 @@ int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits) struct extent_state *state; struct rb_node *node; - read_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); again: while (1) { /* @@ -538,13 +533,13 @@ again: break; if (need_resched()) { - read_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); cond_resched(); - read_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); } } out: - read_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return 0; } EXPORT_SYMBOL(wait_extent_bit); @@ -589,7 +584,7 @@ again: return -ENOMEM; } - write_lock_irqsave(&tree->lock, flags); + spin_lock_irqsave(&tree->lock, flags); /* * this search will find all the extents that end after * our range starts. @@ -709,7 +704,7 @@ again: goto search_again; out: - write_unlock_irqrestore(&tree->lock, flags); + spin_unlock_irqrestore(&tree->lock, flags); if (prealloc) free_extent_state(prealloc); @@ -718,7 +713,7 @@ out: search_again: if (start > end) goto out; - write_unlock_irqrestore(&tree->lock, flags); + spin_unlock_irqrestore(&tree->lock, flags); if (mask & __GFP_WAIT) cond_resched(); goto again; @@ -817,10 +812,6 @@ int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end) } EXPORT_SYMBOL(wait_on_extent_writeback); -/* - * locks a range in ascending order, waiting for any locked regions - * it hits on the way. [start,end] are inclusive, and this will sleep. - */ int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) { int err; @@ -896,7 +887,7 @@ int find_first_extent_bit(struct extent_io_tree *tree, u64 start, struct extent_state *state; int ret = 1; - read_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); /* * this search will find all the extents that end after * our range starts. @@ -919,7 +910,7 @@ int find_first_extent_bit(struct extent_io_tree *tree, u64 start, break; } out: - read_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return ret; } EXPORT_SYMBOL(find_first_extent_bit); @@ -933,7 +924,7 @@ u64 find_lock_delalloc_range(struct extent_io_tree *tree, u64 found = 0; u64 total_bytes = 0; - write_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); /* * this search will find all the extents that end after * our range starts. @@ -976,9 +967,9 @@ search_again: atomic_inc(&state->refs); prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); - write_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); schedule(); - write_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); finish_wait(&state->wq, &wait); free_extent_state(state); goto search_again; @@ -997,7 +988,7 @@ search_again: break; } out: - write_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return found; } @@ -1017,7 +1008,7 @@ u64 count_range_bits(struct extent_io_tree *tree, return 0; } - write_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); if (cur_start == 0 && bits == EXTENT_DIRTY) { total_bytes = tree->dirty_bytes; goto out; @@ -1050,7 +1041,7 @@ u64 count_range_bits(struct extent_io_tree *tree, break; } out: - write_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return total_bytes; } /* @@ -1122,7 +1113,7 @@ int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) struct extent_state *state; int ret = 0; - write_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); /* * this search will find all the extents that end after * our range starts. @@ -1139,7 +1130,7 @@ int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) } state->private = private; out: - write_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return ret; } @@ -1149,7 +1140,7 @@ int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) struct extent_state *state; int ret = 0; - read_lock_irq(&tree->lock); + spin_lock_irq(&tree->lock); /* * this search will find all the extents that end after * our range starts. @@ -1166,13 +1157,13 @@ int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) } *private = state->private; out: - read_unlock_irq(&tree->lock); + spin_unlock_irq(&tree->lock); return ret; } /* * searches a range in the state tree for a given mask. - * If 'filled' == 1, this returns 1 only if ever extent in the tree + * If 'filled' == 1, this returns 1 only if every extent in the tree * has the bits set. Otherwise, 1 is returned if any bit in the * range is found set. */ @@ -1184,7 +1175,7 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, int bitset = 0; unsigned long flags; - read_lock_irqsave(&tree->lock, flags); + spin_lock_irqsave(&tree->lock, flags); node = tree_search(&tree->state, start); while (node && start <= end) { state = rb_entry(node, struct extent_state, rb_node); @@ -1215,7 +1206,7 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, break; } } - read_unlock_irqrestore(&tree->lock, flags); + spin_unlock_irqrestore(&tree->lock, flags); return bitset; } EXPORT_SYMBOL(test_range_bit); @@ -1282,16 +1273,19 @@ static int end_bio_extent_writepage(struct bio *bio, { const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; - struct extent_io_tree *tree = bio->bi_private; + struct extent_state *state = bio->bi_private; + struct extent_io_tree *tree = state->tree; + struct rb_node *node; u64 start; u64 end; + u64 cur; int whole_page; + unsigned long flags; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) if (bio->bi_size) return 1; #endif - do { struct page *page = bvec->bv_page; start = ((u64)page->index << PAGE_CACHE_SHIFT) + @@ -1311,16 +1305,80 @@ static int end_bio_extent_writepage(struct bio *bio, ClearPageUptodate(page); SetPageError(page); } - clear_extent_writeback(tree, start, end, GFP_ATOMIC); + + if (tree->ops && tree->ops->writepage_end_io_hook) { + tree->ops->writepage_end_io_hook(page, start, end, + state); + } + + /* + * bios can get merged in funny ways, and so we need to + * be careful with the state variable. We know the + * state won't be merged with others because it has + * WRITEBACK set, but we can't be sure each biovec is + * sequential in the file. So, if our cached state + * doesn't match the expected end, search the tree + * for the correct one. + */ + + spin_lock_irqsave(&tree->lock, flags); + if (!state || state->end != end) { + state = NULL; + node = __tree_search(&tree->state, start, NULL, NULL); + if (node) { + state = rb_entry(node, struct extent_state, + rb_node); + if (state->end != end || + !(state->state & EXTENT_WRITEBACK)) + state = NULL; + } + if (!state) { + spin_unlock_irqrestore(&tree->lock, flags); + clear_extent_writeback(tree, start, + end, GFP_ATOMIC); + goto next_io; + } + } + cur = end; + while(1) { + struct extent_state *clear = state; + cur = state->start; + node = rb_prev(&state->rb_node); + if (node) { + state = rb_entry(node, + struct extent_state, + rb_node); + } else { + state = NULL; + } + + clear_state_bit(tree, clear, EXTENT_WRITEBACK, + 1, 0); + if (cur == start) + break; + if (cur < start) { + WARN_ON(1); + break; + } + if (!node) + break; + } + /* before releasing the lock, make sure the next state + * variable has the expected bits set and corresponds + * to the correct offsets in the file + */ + if (state && (state->end + 1 != start || + !state->state & EXTENT_WRITEBACK)) { + state = NULL; + } + spin_unlock_irqrestore(&tree->lock, flags); +next_io: if (whole_page) end_page_writeback(page); else check_page_writeback(tree, page); - if (tree->ops && tree->ops->writepage_end_io_hook) - tree->ops->writepage_end_io_hook(page, start, end); } while (bvec >= bio->bi_io_vec); - bio_put(bio); #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) return 0; @@ -1347,9 +1405,13 @@ static int end_bio_extent_readpage(struct bio *bio, { int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; - struct extent_io_tree *tree = bio->bi_private; + struct extent_state *state = bio->bi_private; + struct extent_io_tree *tree = state->tree; + struct rb_node *node; u64 start; u64 end; + u64 cur; + unsigned long flags; int whole_page; int ret; @@ -1373,27 +1435,83 @@ static int end_bio_extent_readpage(struct bio *bio, prefetchw(&bvec->bv_page->flags); if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { - ret = tree->ops->readpage_end_io_hook(page, start, end); + ret = tree->ops->readpage_end_io_hook(page, start, end, + state); if (ret) uptodate = 0; } - if (uptodate) { - set_extent_uptodate(tree, start, end, GFP_ATOMIC); - if (whole_page) - SetPageUptodate(page); - else - check_page_uptodate(tree, page); - } else { - ClearPageUptodate(page); - SetPageError(page); - } - unlock_extent(tree, start, end, GFP_ATOMIC); + spin_lock_irqsave(&tree->lock, flags); + if (!state || state->end != end) { + state = NULL; + node = __tree_search(&tree->state, start, NULL, NULL); + if (node) { + state = rb_entry(node, struct extent_state, + rb_node); + if (state->end != end || + !(state->state & EXTENT_LOCKED)) + state = NULL; + } + if (!state) { + spin_unlock_irqrestore(&tree->lock, flags); + set_extent_uptodate(tree, start, end, + GFP_ATOMIC); + unlock_extent(tree, start, end, GFP_ATOMIC); + goto next_io; + } + } - if (whole_page) + cur = end; + while(1) { + struct extent_state *clear = state; + cur = state->start; + node = rb_prev(&state->rb_node); + if (node) { + state = rb_entry(node, + struct extent_state, + rb_node); + } else { + state = NULL; + } + clear->state |= EXTENT_UPTODATE; + clear_state_bit(tree, clear, EXTENT_LOCKED, + 1, 0); + if (cur == start) + break; + if (cur < start) { + WARN_ON(1); + break; + } + if (!node) + break; + } + /* before releasing the lock, make sure the next state + * variable has the expected bits set and corresponds + * to the correct offsets in the file + */ + if (state && (state->end + 1 != start || + !state->state & EXTENT_WRITEBACK)) { + state = NULL; + } + spin_unlock_irqrestore(&tree->lock, flags); +next_io: + if (whole_page) { + if (uptodate) { + SetPageUptodate(page); + } else { + ClearPageUptodate(page); + SetPageError(page); + } unlock_page(page); - else + } else { + if (uptodate) { + check_page_uptodate(tree, page); + } else { + ClearPageUptodate(page); + SetPageError(page); + } check_page_locked(tree, page); + } } while (bvec >= bio->bi_io_vec); bio_put(bio); @@ -1416,7 +1534,8 @@ static int end_bio_extent_preparewrite(struct bio *bio, { const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; - struct extent_io_tree *tree = bio->bi_private; + struct extent_state *state = bio->bi_private; + struct extent_io_tree *tree = state->tree; u64 start; u64 end; @@ -1475,6 +1594,29 @@ static int submit_one_bio(int rw, struct bio *bio) { u64 maxsector; int ret = 0; + struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; + struct page *page = bvec->bv_page; + struct extent_io_tree *tree = bio->bi_private; + struct rb_node *node; + struct extent_state *state; + u64 start; + u64 end; + + start = ((u64)page->index << PAGE_CACHE_SHIFT) + bvec->bv_offset; + end = start + bvec->bv_len - 1; + + spin_lock_irq(&tree->lock); + node = __tree_search(&tree->state, start, NULL, NULL); + BUG_ON(!node); + state = rb_entry(node, struct extent_state, rb_node); + while(state->end < end) { + node = rb_next(node); + state = rb_entry(node, struct extent_state, rb_node); + } + BUG_ON(state->end != end); + spin_unlock_irq(&tree->lock); + + bio->bi_private = state; bio_get(bio); @@ -1519,9 +1661,12 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree, if (!bio) { printk("failed to allocate bio nr %d\n", nr); } + + bio_add_page(bio, page, size, offset); bio->bi_end_io = end_io_func; bio->bi_private = tree; + if (bio_ret) { *bio_ret = bio; } else { @@ -1635,6 +1780,16 @@ static int __extent_read_full_page(struct extent_io_tree *tree, page_offset += iosize; continue; } + /* we have an inline extent but it didn't get marked up + * to date. Error out + */ + if (block_start == EXTENT_MAP_INLINE) { + SetPageError(page); + unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); + cur = cur + iosize; + page_offset += iosize; + continue; + } ret = 0; if (tree->ops && tree->ops->readpage_io_hook) { @@ -2205,7 +2360,8 @@ EXPORT_SYMBOL(extent_prepare_write); * map records are removed */ int try_release_extent_mapping(struct extent_map_tree *map, - struct extent_io_tree *tree, struct page *page) + struct extent_io_tree *tree, struct page *page, + gfp_t mask) { struct extent_map *em; u64 start = (u64)page->index << PAGE_CACHE_SHIFT; @@ -2213,30 +2369,42 @@ int try_release_extent_mapping(struct extent_map_tree *map, u64 orig_start = start; int ret = 1; - while (start <= end) { - spin_lock(&map->lock); - em = lookup_extent_mapping(map, start, end); - if (!em || IS_ERR(em)) { + if ((mask & __GFP_WAIT) && + page->mapping->host->i_size > 16 * 1024 * 1024) { + while (start <= end) { + spin_lock(&map->lock); + em = lookup_extent_mapping(map, start, end); + if (!em || IS_ERR(em)) { + spin_unlock(&map->lock); + break; + } + if (em->start != start) { + spin_unlock(&map->lock); + free_extent_map(em); + break; + } + if (!test_range_bit(tree, em->start, + extent_map_end(em) - 1, + EXTENT_LOCKED, 0)) { + remove_extent_mapping(map, em); + /* once for the rb tree */ + free_extent_map(em); + } + start = extent_map_end(em); spin_unlock(&map->lock); - break; - } - if (!test_range_bit(tree, em->start, extent_map_end(em) - 1, - EXTENT_LOCKED, 0)) { - remove_extent_mapping(map, em); - /* once for the rb tree */ + + /* once for us */ free_extent_map(em); } - start = extent_map_end(em); - spin_unlock(&map->lock); - - /* once for us */ - free_extent_map(em); } - if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0)) + if (test_range_bit(tree, orig_start, end, EXTENT_IOBITS, 0)) ret = 0; - else + else { + if ((mask & GFP_NOFS) == GFP_NOFS) + mask = GFP_NOFS; clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE, - 1, 1, GFP_NOFS); + 1, 1, mask); + } return ret; } EXPORT_SYMBOL(try_release_extent_mapping); @@ -2553,13 +2721,13 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree, } } clear_page_dirty_for_io(page); - write_lock_irq(&page->mapping->tree_lock); + read_lock_irq(&page->mapping->tree_lock); if (!PageDirty(page)) { radix_tree_tag_clear(&page->mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } - write_unlock_irq(&page->mapping->tree_lock); + read_unlock_irq(&page->mapping->tree_lock); unlock_page(page); } return 0; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 06be1fe84b29..f1e8bf251f32 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -23,19 +23,23 @@ #define EXTENT_PAGE_PRIVATE 1 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 +struct extent_state; + struct extent_io_ops { int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); int (*writepage_io_hook)(struct page *page, u64 start, u64 end); int (*readpage_io_hook)(struct page *page, u64 start, u64 end); - int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end); - void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end); + int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, + struct extent_state *state); + void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, + struct extent_state *state); }; struct extent_io_tree { struct rb_root state; struct address_space *mapping; u64 dirty_bytes; - rwlock_t lock; + spinlock_t lock; struct extent_io_ops *ops; spinlock_t lru_lock; struct list_head buffer_lru; @@ -45,8 +49,8 @@ struct extent_io_tree { struct extent_state { u64 start; u64 end; /* inclusive */ - int in_tree; struct rb_node rb_node; + struct extent_io_tree *tree; wait_queue_head_t wq; atomic_t refs; unsigned long state; @@ -82,7 +86,8 @@ void extent_io_tree_init(struct extent_io_tree *tree, struct address_space *mapping, gfp_t mask); void extent_io_tree_empty_lru(struct extent_io_tree *tree); int try_release_extent_mapping(struct extent_map_tree *map, - struct extent_io_tree *tree, struct page *page); + struct extent_io_tree *tree, struct page *page, + gfp_t mask); int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); int extent_read_full_page(struct extent_io_tree *tree, struct page *page, diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 484551274100..bac8722e14e1 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -331,7 +331,8 @@ out: return ret; } -int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) +int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, + struct extent_state *state) { size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); struct inode *inode = page->mapping->host; @@ -347,7 +348,12 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) btrfs_test_flag(inode, NODATASUM)) return 0; - ret = get_state_private(io_tree, start, &private); + if (state->start == start) { + private = state->private; + ret = 0; + } else { + ret = get_state_private(io_tree, start, &private); + } local_irq_save(flags); kaddr = kmap_atomic(page, KM_IRQ0); if (ret) { @@ -1830,7 +1836,7 @@ out_unlock: } struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, - size_t page_offset, u64 start, u64 len, + size_t pg_offset, u64 start, u64 len, int create) { int ret; @@ -1865,7 +1871,10 @@ again: start, len, em->start, em->len); WARN_ON(1); } - goto out; + if (em->block_start == EXTENT_MAP_INLINE && page) + free_extent_map(em); + else + goto out; } em = alloc_extent_map(GFP_NOFS); if (!em) { @@ -1930,6 +1939,7 @@ again: em->len = extent_end - extent_start; goto insert; } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { + u64 page_start; unsigned long ptr; char *map; size_t size; @@ -1959,16 +1969,17 @@ again: goto out; } - extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - - extent_start + page_offset; - copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, + page_start = page_offset(page) + pg_offset; + extent_offset = page_start - extent_start; + copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, size - extent_offset); em->start = extent_start + extent_offset; - em->len = copy_size; + em->len = (copy_size + root->sectorsize - 1) & + ~((u64)root->sectorsize - 1); map = kmap(page); ptr = btrfs_file_extent_inline_start(item) + extent_offset; if (create == 0 && !PageUptodate(page)) { - read_extent_buffer(leaf, map + page_offset, ptr, + read_extent_buffer(leaf, map + pg_offset, ptr, copy_size); flush_dcache_page(page); } else if (create && PageUptodate(page)) { @@ -1980,7 +1991,7 @@ again: trans = btrfs_start_transaction(root, 1); goto again; } - write_extent_buffer(leaf, map + page_offset, ptr, + write_extent_buffer(leaf, map + pg_offset, ptr, copy_size); btrfs_mark_buffer_dirty(leaf); } @@ -2077,7 +2088,7 @@ btrfs_readpages(struct file *file, struct address_space *mapping, btrfs_get_extent); } -static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) +static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) { struct extent_io_tree *tree; struct extent_map_tree *map; @@ -2085,7 +2096,7 @@ static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) tree = &BTRFS_I(page->mapping->host)->io_tree; map = &BTRFS_I(page->mapping->host)->extent_tree; - ret = try_release_extent_mapping(map, tree, page); + ret = try_release_extent_mapping(map, tree, page, gfp_flags); if (ret == 1) { ClearPagePrivate(page); set_page_private(page, 0);