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btrfs: backref, add tracepoints for prelim_ref insertion and merging 

This patch adds a tracepoint event for prelim_ref insertion and
merging.  For each, the ref being inserted or merged and the count
of tree nodes is issued.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2017-07-12 16:20:08 -06:00 committed by David Sterba
parent 6c336b212b
commit 00142756e1
4 changed files with 131 additions and 58 deletions
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118
fs/btrfs/backref.c
View File

@ -18,6 +18,7 @@
#include <linux/mm.h>
#include <linux/rbtree.h>
#include <trace/events/btrfs.h>
#include "ctree.h"
#include "disk-io.h"
#include "backref.h"
@ -120,20 +121,6 @@ static int find_extent_in_eb(const struct extent_buffer *eb,
return 0;
}
/*
* this structure records all encountered refs on the way up to the root
*/
struct prelim_ref {
struct rb_node rbnode;
u64 root_id;
struct btrfs_key key_for_search;
int level;
int count;
struct extent_inode_elem *inode_list;
u64 parent;
u64 wanted_disk_byte;
};
struct preftree {
struct rb_root root;
unsigned int count;
@ -212,7 +199,8 @@ static int prelim_ref_compare(struct prelim_ref *ref1,
*
* Callers should assumed that newref has been freed after calling.
*/
static void prelim_ref_insert(struct preftree *preftree,
static void prelim_ref_insert(const struct btrfs_fs_info *fs_info,
struct preftree *preftree,
struct prelim_ref *newref)
{
struct rb_root *root;
@ -243,6 +231,8 @@ static void prelim_ref_insert(struct preftree *preftree,
ref->inode_list = newref->inode_list;
else
eie->next = newref->inode_list;
trace_btrfs_prelim_ref_merge(fs_info, ref, newref,
preftree->count);
ref->count += newref->count;
free_pref(newref);
return;
@ -250,6 +240,7 @@ static void prelim_ref_insert(struct preftree *preftree,
}
preftree->count++;
trace_btrfs_prelim_ref_insert(fs_info, newref, NULL, preftree->count);
rb_link_node(&newref->rbnode, parent, p);
rb_insert_color(&newref->rbnode, root);
}
@ -308,7 +299,8 @@ static void prelim_release(struct preftree *preftree)
* additional information that's available but not required to find the parent
* block might help in merging entries to gain some speed.
*/
static int add_prelim_ref(struct preftree *preftree, u64 root_id,
static int add_prelim_ref(const struct btrfs_fs_info *fs_info,
struct preftree *preftree, u64 root_id,
const struct btrfs_key *key, int level, u64 parent,
u64 wanted_disk_byte, int count, gfp_t gfp_mask)
{
@ -355,21 +347,23 @@ static int add_prelim_ref(struct preftree *preftree, u64 root_id,
ref->count = count;
ref->parent = parent;
ref->wanted_disk_byte = wanted_disk_byte;
prelim_ref_insert(preftree, ref);
prelim_ref_insert(fs_info, preftree, ref);
return 0;
}
/* direct refs use root == 0, key == NULL */
static int add_direct_ref(struct preftrees *preftrees, int level, u64 parent,
static int add_direct_ref(const struct btrfs_fs_info *fs_info,
struct preftrees *preftrees, int level, u64 parent,
u64 wanted_disk_byte, int count, gfp_t gfp_mask)
{
return add_prelim_ref(&preftrees->direct, 0, NULL, level, parent,
wanted_disk_byte, count, gfp_mask);
return add_prelim_ref(fs_info, &preftrees->direct, 0, NULL, level,
parent, wanted_disk_byte, count, gfp_mask);
}
/* indirect refs use parent == 0 */
static int add_indirect_ref(struct preftrees *preftrees, u64 root_id,
static int add_indirect_ref(const struct btrfs_fs_info *fs_info,
struct preftrees *preftrees, u64 root_id,
const struct btrfs_key *key, int level,
u64 wanted_disk_byte, int count, gfp_t gfp_mask)
{
@ -377,7 +371,7 @@ static int add_indirect_ref(struct preftrees *preftrees, u64 root_id,
if (!key)
tree = &preftrees->indirect_missing_keys;
return add_prelim_ref(tree, root_id, key, level, 0,
return add_prelim_ref(fs_info, tree, root_id, key, level, 0,
wanted_disk_byte, count, gfp_mask);
}
@ -631,7 +625,7 @@ static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
* and return directly.
*/
if (err == -ENOENT) {
prelim_ref_insert(&preftrees->direct, ref);
prelim_ref_insert(fs_info, &preftrees->direct, ref);
continue;
} else if (err) {
free_pref(ref);
@ -659,11 +653,11 @@ static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
memcpy(new_ref, ref, sizeof(*ref));
new_ref->parent = node->val;
new_ref->inode_list = unode_aux_to_inode_list(node);
prelim_ref_insert(&preftrees->direct, new_ref);
prelim_ref_insert(fs_info, &preftrees->direct, new_ref);
}
/* Now it's a direct ref, put it in the the direct tree */
prelim_ref_insert(&preftrees->direct, ref);
prelim_ref_insert(fs_info, &preftrees->direct, ref);
ulist_reinit(parents);
}
@ -707,7 +701,7 @@ static int add_missing_keys(struct btrfs_fs_info *fs_info,
btrfs_node_key_to_cpu(eb, &ref->key_for_search, 0);
btrfs_tree_read_unlock(eb);
free_extent_buffer(eb);
prelim_ref_insert(&preftrees->indirect, ref);
prelim_ref_insert(fs_info, &preftrees->indirect, ref);
}
return 0;
}
@ -716,7 +710,8 @@ static int add_missing_keys(struct btrfs_fs_info *fs_info,
* add all currently queued delayed refs from this head whose seq nr is
* smaller or equal that seq to the list
*/
static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
static int add_delayed_refs(const struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_head *head, u64 seq,
struct preftrees *preftrees, u64 *total_refs,
u64 inum)
{
@ -759,8 +754,9 @@ static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
struct btrfs_delayed_tree_ref *ref;
ref = btrfs_delayed_node_to_tree_ref(node);
ret = add_indirect_ref(preftrees, ref->root, &tmp_op_key,
ref->level + 1, node->bytenr,
ret = add_indirect_ref(fs_info, preftrees, ref->root,
&tmp_op_key, ref->level + 1,
node->bytenr,
node->ref_mod * sgn,
GFP_ATOMIC);
break;
@ -771,9 +767,9 @@ static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
ref = btrfs_delayed_node_to_tree_ref(node);
ret = add_direct_ref(preftrees, ref->level + 1,
ref->parent, node->bytenr,
node->ref_mod * sgn,
ret = add_direct_ref(fs_info, preftrees,
ref->level + 1, ref->parent,
node->bytenr, node->ref_mod * sgn,
GFP_ATOMIC);
break;
}
@ -795,8 +791,8 @@ static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
break;
}
ret = add_indirect_ref(preftrees, ref->root, &key, 0,
node->bytenr,
ret = add_indirect_ref(fs_info, preftrees, ref->root,
&key, 0, node->bytenr,
node->ref_mod * sgn,
GFP_ATOMIC);
break;
@ -807,8 +803,8 @@ static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
ref = btrfs_delayed_node_to_data_ref(node);
ret = add_direct_ref(preftrees, 0, ref->parent,
node->bytenr,
ret = add_direct_ref(fs_info, preftrees, 0,
ref->parent, node->bytenr,
node->ref_mod * sgn,
GFP_ATOMIC);
break;
@ -826,7 +822,8 @@ static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
/*
* add all inline backrefs for bytenr to the list
*/
static int add_inline_refs(struct btrfs_path *path, u64 bytenr,
static int add_inline_refs(const struct btrfs_fs_info *fs_info,
struct btrfs_path *path, u64 bytenr,
int *info_level, struct preftrees *preftrees,
u64 *total_refs, u64 inum)
{
@ -883,7 +880,8 @@ static int add_inline_refs(struct btrfs_path *path, u64 bytenr,
switch (type) {
case BTRFS_SHARED_BLOCK_REF_KEY:
ret = add_direct_ref(preftrees, *info_level + 1, offset,
ret = add_direct_ref(fs_info, preftrees,
*info_level + 1, offset,
bytenr, 1, GFP_NOFS);
break;
case BTRFS_SHARED_DATA_REF_KEY: {
@ -893,14 +891,14 @@ static int add_inline_refs(struct btrfs_path *path, u64 bytenr,
sdref = (struct btrfs_shared_data_ref *)(iref + 1);
count = btrfs_shared_data_ref_count(leaf, sdref);
ret = add_direct_ref(preftrees, 0, offset,
ret = add_direct_ref(fs_info, preftrees, 0, offset,
bytenr, count, GFP_NOFS);
break;
}
case BTRFS_TREE_BLOCK_REF_KEY:
ret = add_indirect_ref(preftrees, offset, NULL,
*info_level + 1, bytenr, 1,
GFP_NOFS);
ret = add_indirect_ref(fs_info, preftrees, offset,
NULL, *info_level + 1,
bytenr, 1, GFP_NOFS);
break;
case BTRFS_EXTENT_DATA_REF_KEY: {
struct btrfs_extent_data_ref *dref;
@ -921,8 +919,9 @@ static int add_inline_refs(struct btrfs_path *path, u64 bytenr,
root = btrfs_extent_data_ref_root(leaf, dref);
ret = add_indirect_ref(preftrees, root, &key, 0, bytenr,
count, GFP_NOFS);
ret = add_indirect_ref(fs_info, preftrees, root,
&key, 0, bytenr, count,
GFP_NOFS);
break;
}
default:
@ -973,9 +972,9 @@ static int add_keyed_refs(struct btrfs_fs_info *fs_info,
switch (key.type) {
case BTRFS_SHARED_BLOCK_REF_KEY:
/* SHARED DIRECT METADATA backref */
ret = add_direct_ref(preftrees, info_level + 1,
key.offset, bytenr, 1,
GFP_NOFS);
ret = add_direct_ref(fs_info, preftrees,
info_level + 1, key.offset,
bytenr, 1, GFP_NOFS);
break;
case BTRFS_SHARED_DATA_REF_KEY: {
/* SHARED DIRECT FULL backref */
@ -985,15 +984,16 @@ static int add_keyed_refs(struct btrfs_fs_info *fs_info,
sdref = btrfs_item_ptr(leaf, slot,
struct btrfs_shared_data_ref);
count = btrfs_shared_data_ref_count(leaf, sdref);
ret = add_direct_ref(preftrees, 0, key.offset, bytenr,
count, GFP_NOFS);
ret = add_direct_ref(fs_info, preftrees, 0,
key.offset, bytenr, count,
GFP_NOFS);
break;
}
case BTRFS_TREE_BLOCK_REF_KEY:
/* NORMAL INDIRECT METADATA backref */
ret = add_indirect_ref(preftrees, key.offset, NULL,
info_level + 1, bytenr, 1,
GFP_NOFS);
ret = add_indirect_ref(fs_info, preftrees, key.offset,
NULL, info_level + 1, bytenr,
1, GFP_NOFS);
break;
case BTRFS_EXTENT_DATA_REF_KEY: {
/* NORMAL INDIRECT DATA backref */
@ -1015,8 +1015,9 @@ static int add_keyed_refs(struct btrfs_fs_info *fs_info,
}
root = btrfs_extent_data_ref_root(leaf, dref);
ret = add_indirect_ref(preftrees, root, &key, 0, bytenr,
count, GFP_NOFS);
ret = add_indirect_ref(fs_info, preftrees, root,
&key, 0, bytenr, count,
GFP_NOFS);
break;
}
default:
@ -1129,8 +1130,8 @@ again:
goto again;
}
spin_unlock(&delayed_refs->lock);
ret = add_delayed_refs(head, time_seq, &preftrees,
&total_refs, inum);
ret = add_delayed_refs(fs_info, head, time_seq,
&preftrees, &total_refs, inum);
mutex_unlock(&head->mutex);
if (ret)
goto out;
@ -1150,8 +1151,9 @@ again:
if (key.objectid == bytenr &&
(key.type == BTRFS_EXTENT_ITEM_KEY ||
key.type == BTRFS_METADATA_ITEM_KEY)) {
ret = add_inline_refs(path, bytenr, &info_level,
&preftrees, &total_refs, inum);
ret = add_inline_refs(fs_info, path, bytenr,
&info_level, &preftrees,
&total_refs, inum);
if (ret)
goto out;
ret = add_keyed_refs(fs_info, path, bytenr, info_level,

12
fs/btrfs/backref.h
View File

@ -72,4 +72,16 @@ int btrfs_check_shared(struct btrfs_root *root, u64 inum, u64 bytenr);
int __init btrfs_prelim_ref_init(void);
void btrfs_prelim_ref_exit(void);
struct prelim_ref {
struct rb_node rbnode;
u64 root_id;
struct btrfs_key key_for_search;
int level;
int count;
struct extent_inode_elem *inode_list;
u64 parent;
u64 wanted_disk_byte;
};
#endif

1
fs/btrfs/super.c
View File

@ -61,6 +61,7 @@
#include "tests/btrfs-tests.h"
#include "qgroup.h"
#include "backref.h"
#define CREATE_TRACE_POINTS
#include <trace/events/btrfs.h>

58
include/trace/events/btrfs.h
View File

@ -26,6 +26,7 @@ struct btrfs_work;
struct __btrfs_workqueue;
struct btrfs_qgroup_extent_record;
struct btrfs_qgroup;
struct prelim_ref;
#define show_ref_type(type) \
__print_symbolic(type, \
@ -1636,6 +1637,63 @@ TRACE_EVENT(qgroup_meta_reserve,
show_root_type(__entry->refroot), __entry->diff)
);
DECLARE_EVENT_CLASS(btrfs__prelim_ref,
TP_PROTO(const struct btrfs_fs_info *fs_info,
const struct prelim_ref *oldref,
const struct prelim_ref *newref, u64 tree_size),
TP_ARGS(fs_info, newref, oldref, tree_size),
TP_STRUCT__entry_btrfs(
__field( u64, root_id )
__field( u64, objectid )
__field( u8, type )
__field( u64, offset )
__field( int, level )
__field( int, old_count )
__field( u64, parent )
__field( u64, bytenr )
__field( int, mod_count )
__field( u64, tree_size )
),
TP_fast_assign_btrfs(fs_info,
__entry->root_id = oldref->root_id;
__entry->objectid = oldref->key_for_search.objectid;
__entry->type = oldref->key_for_search.type;
__entry->offset = oldref->key_for_search.offset;
__entry->level = oldref->level;
__entry->old_count = oldref->count;
__entry->parent = oldref->parent;
__entry->bytenr = oldref->wanted_disk_byte;
__entry->mod_count = newref ? newref->count : 0;
__entry->tree_size = tree_size;
),
TP_printk_btrfs("root_id=%llu key=[%llu,%u,%llu] level=%d count=[%d+%d=%d] parent=%llu wanted_disk_byte=%llu nodes=%llu",
(unsigned long long)__entry->root_id,
(unsigned long long)__entry->objectid, __entry->type,
(unsigned long long)__entry->offset, __entry->level,
__entry->old_count, __entry->mod_count,
__entry->old_count + __entry->mod_count,
(unsigned long long)__entry->parent,
(unsigned long long)__entry->bytenr,
(unsigned long long)__entry->tree_size)
);
DEFINE_EVENT(btrfs__prelim_ref, btrfs_prelim_ref_merge,
TP_PROTO(const struct btrfs_fs_info *fs_info,
const struct prelim_ref *oldref,
const struct prelim_ref *newref, u64 tree_size),
TP_ARGS(fs_info, oldref, newref, tree_size)
);
DEFINE_EVENT(btrfs__prelim_ref, btrfs_prelim_ref_insert,
TP_PROTO(const struct btrfs_fs_info *fs_info,
const struct prelim_ref *oldref,
const struct prelim_ref *newref, u64 tree_size),
TP_ARGS(fs_info, oldref, newref, tree_size)
);
#endif /* _TRACE_BTRFS_H */
/* This part must be outside protection */