Btrfs: move the extent buffer radix tree into the fs_info
I need to create a fake tree to test qgroups and I don't want to have to setup a
fake btree_inode. The fact is we only use the radix tree for the fs_info, so
everybody else who allocates an extent_io_tree is just wasting the space anyway.
This patch moves the radix tree and its lock into btrfs_fs_info so there is less
stuff I have to fake to do qgroup sanity tests. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7158c97..a924274 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1659,6 +1659,10 @@
spinlock_t reada_lock;
struct radix_tree_root reada_tree;
+ /* Extent buffer radix tree */
+ spinlock_t buffer_lock;
+ struct radix_tree_root buffer_radix;
+
/* next backup root to be overwritten */
int backup_root_index;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4ecee0a..4a1871c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1089,21 +1089,13 @@
struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize)
{
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_buffer *eb;
- eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, bytenr);
- return eb;
+ return find_extent_buffer(root->fs_info, bytenr);
}
struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize)
{
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_buffer *eb;
-
- eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
- bytenr, blocksize);
- return eb;
+ return alloc_extent_buffer(root->fs_info, bytenr, blocksize);
}
@@ -2145,6 +2137,7 @@
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
+ INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
INIT_LIST_HEAD(&fs_info->trans_list);
INIT_LIST_HEAD(&fs_info->dead_roots);
INIT_LIST_HEAD(&fs_info->delayed_iputs);
@@ -2158,6 +2151,7 @@
spin_lock_init(&fs_info->free_chunk_lock);
spin_lock_init(&fs_info->tree_mod_seq_lock);
spin_lock_init(&fs_info->super_lock);
+ spin_lock_init(&fs_info->buffer_lock);
rwlock_init(&fs_info->tree_mod_log_lock);
mutex_init(&fs_info->reloc_mutex);
seqlock_init(&fs_info->profiles_lock);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 92a3ad4..2fa23b5 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -194,11 +194,9 @@
struct address_space *mapping)
{
tree->state = RB_ROOT;
- INIT_RADIX_TREE(&tree->buffer, GFP_ATOMIC);
tree->ops = NULL;
tree->dirty_bytes = 0;
spin_lock_init(&tree->lock);
- spin_lock_init(&tree->buffer_lock);
tree->mapping = mapping;
}
@@ -3489,6 +3487,7 @@
struct extent_page_data *epd)
{
struct block_device *bdev = fs_info->fs_devices->latest_bdev;
+ struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
u64 offset = eb->start;
unsigned long i, num_pages;
unsigned long bio_flags = 0;
@@ -3506,7 +3505,7 @@
clear_page_dirty_for_io(p);
set_page_writeback(p);
- ret = submit_extent_page(rw, eb->tree, p, offset >> 9,
+ ret = submit_extent_page(rw, tree, p, offset >> 9,
PAGE_CACHE_SIZE, 0, bdev, &epd->bio,
-1, end_bio_extent_buffer_writepage,
0, epd->bio_flags, bio_flags);
@@ -4370,10 +4369,9 @@
__free_extent_buffer(eb);
}
-static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
- u64 start,
- unsigned long len,
- gfp_t mask)
+static struct extent_buffer *
+__alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
+ unsigned long len, gfp_t mask)
{
struct extent_buffer *eb = NULL;
@@ -4382,7 +4380,7 @@
return NULL;
eb->start = start;
eb->len = len;
- eb->tree = tree;
+ eb->fs_info = fs_info;
eb->bflags = 0;
rwlock_init(&eb->lock);
atomic_set(&eb->write_locks, 0);
@@ -4514,13 +4512,14 @@
}
}
-struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
- u64 start)
+struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 start)
{
struct extent_buffer *eb;
rcu_read_lock();
- eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
+ eb = radix_tree_lookup(&fs_info->buffer_radix,
+ start >> PAGE_CACHE_SHIFT);
if (eb && atomic_inc_not_zero(&eb->refs)) {
rcu_read_unlock();
mark_extent_buffer_accessed(eb);
@@ -4531,7 +4530,7 @@
return NULL;
}
-struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start, unsigned long len)
{
unsigned long num_pages = num_extent_pages(start, len);
@@ -4540,16 +4539,15 @@
struct extent_buffer *eb;
struct extent_buffer *exists = NULL;
struct page *p;
- struct address_space *mapping = tree->mapping;
+ struct address_space *mapping = fs_info->btree_inode->i_mapping;
int uptodate = 1;
int ret;
-
- eb = find_extent_buffer(tree, start);
+ eb = find_extent_buffer(fs_info, start);
if (eb)
return eb;
- eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS);
+ eb = __alloc_extent_buffer(fs_info, start, len, GFP_NOFS);
if (!eb)
return NULL;
@@ -4604,12 +4602,13 @@
if (ret)
goto free_eb;
- spin_lock(&tree->buffer_lock);
- ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb);
- spin_unlock(&tree->buffer_lock);
+ spin_lock(&fs_info->buffer_lock);
+ ret = radix_tree_insert(&fs_info->buffer_radix,
+ start >> PAGE_CACHE_SHIFT, eb);
+ spin_unlock(&fs_info->buffer_lock);
radix_tree_preload_end();
if (ret == -EEXIST) {
- exists = find_extent_buffer(tree, start);
+ exists = find_extent_buffer(fs_info, start);
if (exists)
goto free_eb;
else
@@ -4662,14 +4661,14 @@
WARN_ON(atomic_read(&eb->refs) == 0);
if (atomic_dec_and_test(&eb->refs)) {
if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {
- struct extent_io_tree *tree = eb->tree;
+ struct btrfs_fs_info *fs_info = eb->fs_info;
spin_unlock(&eb->refs_lock);
- spin_lock(&tree->buffer_lock);
- radix_tree_delete(&tree->buffer,
+ spin_lock(&fs_info->buffer_lock);
+ radix_tree_delete(&fs_info->buffer_radix,
eb->start >> PAGE_CACHE_SHIFT);
- spin_unlock(&tree->buffer_lock);
+ spin_unlock(&fs_info->buffer_lock);
} else {
spin_unlock(&eb->refs_lock);
}
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 92e4347..58b27e5 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -95,12 +95,10 @@
struct extent_io_tree {
struct rb_root state;
- struct radix_tree_root buffer;
struct address_space *mapping;
u64 dirty_bytes;
int track_uptodate;
spinlock_t lock;
- spinlock_t buffer_lock;
struct extent_io_ops *ops;
};
@@ -131,7 +129,7 @@
unsigned long map_start;
unsigned long map_len;
unsigned long bflags;
- struct extent_io_tree *tree;
+ struct btrfs_fs_info *fs_info;
spinlock_t refs_lock;
atomic_t refs;
atomic_t io_pages;
@@ -267,11 +265,11 @@
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);
-struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
-struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);
void free_extent_buffer(struct extent_buffer *eb);
void free_extent_buffer_stale(struct extent_buffer *eb);