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btrfs: add mount option for ref_tracker

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The ref_tracker infrastructure aids debugging but is not enabled by
default as it has a performance impact. Add mount option 'ref_tracker'
so it can be selectively enabled on a filesystem. Currently it track
references of 'delayed inodes'.

Signed-off-by: Leo Martins <loemra.dev@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Leo Martins
2025-08-12 16:04:41 -07:00
committed by David Sterba
parent b767a28d61
commit 46d33a0cc4
3 changed files with 23 additions and 0 deletions
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15
fs/btrfs/delayed-inode.h
View File

@@ -198,6 +198,9 @@ void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
#ifdef CONFIG_BTRFS_DEBUG
static inline void btrfs_delayed_node_ref_tracker_dir_init(struct btrfs_delayed_node *node)
{
if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
return;
ref_tracker_dir_init(&node->ref_dir.dir,
BTRFS_DELAYED_NODE_REF_TRACKER_QUARANTINE_COUNT,
"delayed_node");
@@ -205,11 +208,17 @@ static inline void btrfs_delayed_node_ref_tracker_dir_init(struct btrfs_delayed_
static inline void btrfs_delayed_node_ref_tracker_dir_exit(struct btrfs_delayed_node *node)
{
if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
return;
ref_tracker_dir_exit(&node->ref_dir.dir);
}
static inline void btrfs_delayed_node_ref_tracker_dir_print(struct btrfs_delayed_node *node)
{
if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
return;
ref_tracker_dir_print(&node->ref_dir.dir,
BTRFS_DELAYED_NODE_REF_TRACKER_DISPLAY_LIMIT);
}
@@ -218,12 +227,18 @@ static inline int btrfs_delayed_node_ref_tracker_alloc(struct btrfs_delayed_node
struct btrfs_ref_tracker *tracker,
gfp_t gfp)
{
if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
return 0;
return ref_tracker_alloc(&node->ref_dir.dir, &tracker->tracker, gfp);
}
static inline int btrfs_delayed_node_ref_tracker_free(struct btrfs_delayed_node *node,
struct btrfs_ref_tracker *tracker)
{
if (!btrfs_test_opt(node->root->fs_info, REF_TRACKER))
return 0;
return ref_tracker_free(&node->ref_dir.dir, &tracker->tracker);
}
#else

1
fs/btrfs/fs.h
View File

@@ -245,6 +245,7 @@ enum {
BTRFS_MOUNT_NOSPACECACHE = (1ULL << 30),
BTRFS_MOUNT_IGNOREMETACSUMS = (1ULL << 31),
BTRFS_MOUNT_IGNORESUPERFLAGS = (1ULL << 32),
BTRFS_MOUNT_REF_TRACKER = (1ULL << 33),
};
/*

7
fs/btrfs/super.c
View File

@@ -134,6 +134,7 @@ enum {
#ifdef CONFIG_BTRFS_DEBUG
Opt_fragment, Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
Opt_ref_verify,
Opt_ref_tracker,
#endif
Opt_err,
};
@@ -255,6 +256,7 @@ static const struct fs_parameter_spec btrfs_fs_parameters[] = {
fsparam_flag_no("enospc_debug", Opt_enospc_debug),
#ifdef CONFIG_BTRFS_DEBUG
fsparam_enum("fragment", Opt_fragment, btrfs_parameter_fragment),
fsparam_flag("ref_tracker", Opt_ref_tracker),
fsparam_flag("ref_verify", Opt_ref_verify),
#endif
{}
@@ -645,6 +647,9 @@ static int btrfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
case Opt_ref_verify:
btrfs_set_opt(ctx->mount_opt, REF_VERIFY);
break;
case Opt_ref_tracker:
btrfs_set_opt(ctx->mount_opt, REF_TRACKER);
break;
#endif
default:
btrfs_err(NULL, "unrecognized mount option '%s'", param->key);
@@ -1150,6 +1155,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
#endif
if (btrfs_test_opt(info, REF_VERIFY))
seq_puts(seq, ",ref_verify");
if (btrfs_test_opt(info, REF_TRACKER))
seq_puts(seq, ",ref_tracker");
seq_printf(seq, ",subvolid=%llu", btrfs_root_id(BTRFS_I(d_inode(dentry))->root));
subvol_name = btrfs_get_subvol_name_from_objectid(info,
btrfs_root_id(BTRFS_I(d_inode(dentry))->root));