Btrfs has the following different extent_io_trees used:
- fs_info::free_extents[2]
- btrfs_inode::io_tree
For both normal inodes and btree inode
- btrfs_inode::io_failure_tree
- btrfs_transaction::dirty_pages
- btrfs_root::dirty_log_pages
If we want to trace bits change in those io_trees, it will be pretty
hard to distinguish them.
Instead of using hard-to-read pointer address, this patch will introduc
a new member extent_io_tree::owner, which uses the unpopulated bits of
extent_io_tree::track_uptodate, to track who owns this extent_io_tree.
This modification needs all the callers of extent_io_tree_init() to
accept a new parameter @owner.
This patch provides the basis for later ftrace events.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
fs/btrfs/disk-io.c | 12 ++++++++----
fs/btrfs/extent_io.c | 4 +++-
fs/btrfs/extent_io.h | 22 +++++++++++++++++++---
fs/btrfs/inode.c | 6 ++++--
fs/btrfs/relocation.c | 3 ++-
fs/btrfs/tests/btrfs-tests.c | 6 ++++--
fs/btrfs/tests/extent-io-tests.c | 2 +-
fs/btrfs/transaction.c | 2 +-
8 files changed, 42 insertions(+), 15 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9cf93645ac00..e3d7e4a4f035 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1205,7 +1205,8 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
root->log_transid_committed = -1;
root->last_log_commit = 0;
if (!dummy)
- extent_io_tree_init(fs_info, &root->dirty_log_pages, NULL);
+ extent_io_tree_init(fs_info, &root->dirty_log_pages,
+ IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
@@ -2129,7 +2130,8 @@ static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
inode->i_mapping->a_ops = &btree_aops;
RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
- extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree, inode);
+ extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
+ IO_TREE_INODE_IO_TREE, inode);
BTRFS_I(inode)->io_tree.track_uptodate = 0;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
@@ -2739,8 +2741,10 @@ int open_ctree(struct super_block *sb,
fs_info->block_group_cache_tree = RB_ROOT;
fs_info->first_logical_byte = (u64)-1;
- extent_io_tree_init(fs_info, &fs_info->freed_extents[0], NULL);
- extent_io_tree_init(fs_info, &fs_info->freed_extents[1], NULL);
+ extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
+ IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
+ extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
+ IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
fs_info->pinned_extents = &fs_info->freed_extents[0];
set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index dc4c526dcf7d..dd2cfd054eef 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -201,7 +201,8 @@ void __cold extent_io_exit(void)
}
void extent_io_tree_init(struct btrfs_fs_info *fs_info,
- struct extent_io_tree *tree, void *private_data)
+ struct extent_io_tree *tree, unsigned int owner,
+ void *private_data)
{
tree->fs_info = fs_info;
tree->state = RB_ROOT;
@@ -209,6 +210,7 @@ void extent_io_tree_init(struct btrfs_fs_info *fs_info,
tree->dirty_bytes = 0;
spin_lock_init(&tree->lock);
tree->private_data = private_data;
+ tree->owner = owner;
}
static struct extent_state *alloc_extent_state(gfp_t mask)
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 6cb462b05f5a..54736a22fa2f 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -107,12 +107,27 @@ struct extent_io_ops {
int mirror);
};
+enum {
+ IO_TREE_FS_INFO_FREED_EXTENTS0,
+ IO_TREE_FS_INFO_FREED_EXTENTS1,
+ IO_TREE_INODE_IO_TREE,
+ IO_TREE_INODE_IO_FAILURE_TREE,
+ IO_TREE_RELOC_BLOCKS,
+ IO_TREE_TRANSACTION_DIRTY_PAGES,
+ IO_TREE_ROOT_DIRTY_LOG_PAGES,
+ IO_TREE_SELFTEST_TMP,
+};
+
struct extent_io_tree {
struct rb_root state;
struct btrfs_fs_info *fs_info;
void *private_data;
u64 dirty_bytes;
- int track_uptodate;
+ bool track_uptodate;
+
+ /* who owns this io tree, should be above IO_TREE_* enum */
+ u8 owner;
+
spinlock_t lock;
const struct extent_io_ops *ops;
};
@@ -241,8 +256,9 @@ typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
u64 start, u64 len,
int create);
-void extent_io_tree_init(struct btrfs_fs_info *fs_info,
- struct extent_io_tree *tree, void *private_data);
+void extent_io_tree_init(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *tree, unsigned int owner,
+ void *private_data);
int try_release_extent_mapping(struct page *page, gfp_t mask);
int try_release_extent_buffer(struct page *page);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2d316799eff5..accbe06caf84 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9128,8 +9128,10 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
inode = &ei->vfs_inode;
extent_map_tree_init(&ei->extent_tree);
- extent_io_tree_init(fs_info, &ei->io_tree, inode);
- extent_io_tree_init(fs_info, &ei->io_failure_tree, inode);
+ extent_io_tree_init(fs_info, &ei->io_tree, IO_TREE_INODE_IO_TREE,
+ inode);
+ extent_io_tree_init(fs_info, &ei->io_failure_tree,
+ IO_TREE_INODE_IO_FAILURE_TREE, inode);
ei->io_tree.track_uptodate = 1;
ei->io_failure_tree.track_uptodate = 1;
atomic_set(&ei->sync_writers, 0);
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 152e7ac15b01..0f5ed4a7c022 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4175,7 +4175,8 @@ static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
INIT_LIST_HEAD(&rc->reloc_roots);
backref_cache_init(&rc->backref_cache);
mapping_tree_init(&rc->reloc_root_tree);
- extent_io_tree_init(fs_info, &rc->processed_blocks, NULL);
+ extent_io_tree_init(fs_info, &rc->processed_blocks,
+ IO_TREE_RELOC_BLOCKS, NULL);
return rc;
}
diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index cc1e5d017dc0..1351ac2afdd2 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -115,8 +115,10 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
- extent_io_tree_init(fs_info, &fs_info->freed_extents[0], NULL);
- extent_io_tree_init(fs_info, &fs_info->freed_extents[1], NULL);
+ extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
+ IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
+ extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
+ IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
fs_info->pinned_extents = &fs_info->freed_extents[0];
set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
index 6ac9770a974c..60812f4d3fe3 100644
--- a/fs/btrfs/tests/extent-io-tests.c
+++ b/fs/btrfs/tests/extent-io-tests.c
@@ -77,7 +77,7 @@ static int test_find_delalloc(u32 sectorsize)
return -ENOMEM;
}
- extent_io_tree_init(NULL, &tmp, NULL);
+ extent_io_tree_init(NULL, &tmp, IO_TREE_SELFTEST_TMP, NULL);
/*
* First go through and create and mark all of our pages dirty, we pin
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 638b16c859ba..4799a3b6e2c9 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -274,7 +274,7 @@ static noinline int join_transaction(struct btrfs_fs_info *fs_info,
spin_lock_init(&cur_trans->dropped_roots_lock);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(fs_info, &cur_trans->dirty_pages,
- fs_info->btree_inode);
+ IO_TREE_TRANSACTION_DIRTY_PAGES, fs_info->btree_inode);
fs_info->generation++;
cur_trans->transid = fs_info->generation;
fs_info->running_transaction = cur_trans;
--
2.21.0
