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btrfs: tracepoints: add trace event for log_all_new_ancestors()

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log_all_new_ancestors() is an important step called during a fsync, as
well as during rename and link operations on inodes that were previously
logged. Add trace events for when entering and exiting that function.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2026-05-05 15:31:16 +01:00 committed by David Sterba
parent 0f24ea456a
commit e61574f1a9
2 changed files with 78 additions and 11 deletions
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34
fs/btrfs/tree-log.c
View File

@ -7462,16 +7462,22 @@ static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
struct btrfs_key search_key;
int ret;
trace_btrfs_log_all_new_ancestors_enter(trans, inode);
/*
* For a single hard link case, go through a fast path that does not
* need to iterate the fs/subvolume tree.
*/
if (inode->vfs_inode.i_nlink < 2)
return log_new_ancestors_fast(trans, inode, parent, ctx);
if (inode->vfs_inode.i_nlink < 2) {
ret = log_new_ancestors_fast(trans, inode, parent, ctx);
goto out;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
if (!path) {
ret = -ENOMEM;
goto out;
}
search_key.objectid = ino;
search_key.type = BTRFS_INODE_REF_KEY;
@ -7479,7 +7485,7 @@ static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
again:
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
return ret;
goto out;
if (ret == 0)
path->slots[0]++;
@ -7491,9 +7497,11 @@ static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
return ret;
if (ret > 0)
goto out;
if (ret > 0) {
ret = 0;
break;
}
continue;
}
@ -7509,8 +7517,10 @@ static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
* this loop, etc). So just return some error to fallback to
* a transaction commit.
*/
if (found_key.type == BTRFS_INODE_EXTREF_KEY)
return -EMLINK;
if (found_key.type == BTRFS_INODE_EXTREF_KEY) {
ret = -EMLINK;
goto out;
}
/*
* Logging ancestors needs to do more searches on the fs/subvol
@ -7522,11 +7532,13 @@ static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
ret = log_new_ancestors(trans, root, path, ctx);
if (ret)
return ret;
goto out;
btrfs_release_path(path);
goto again;
}
return 0;
out:
trace_btrfs_log_all_new_ancestors_exit(trans, inode, ret);
return ret;
}
/*

55
include/trace/events/btrfs.h
View File

@ -1120,6 +1120,61 @@ TRACE_EVENT(btrfs_log_all_parents_exit,
__entry->transid, __entry->ret)
);
TRACE_EVENT(btrfs_log_all_new_ancestors_enter,
TP_PROTO(const struct btrfs_trans_handle *trans,
const struct btrfs_inode *inode),
TP_ARGS(trans, inode),
TP_STRUCT__entry_btrfs(
__field( u64, root_objectid )
__field( u64, ino )
__field( u64, transid )
__field( unsigned int, nlink )
),
TP_fast_assign(
TP_fast_assign_fsid(inode->root->fs_info);
__entry->root_objectid = btrfs_root_id(inode->root);
__entry->ino = btrfs_ino(inode);
__entry->transid = trans->transid;
__entry->nlink = inode->vfs_inode.i_nlink;
),
TP_printk_btrfs("root=%llu(%s) ino=%llu transid=%llu nlink=%u",
show_root_type(__entry->root_objectid), __entry->ino,
__entry->transid, __entry->nlink)
);
TRACE_EVENT(btrfs_log_all_new_ancestors_exit,
TP_PROTO(const struct btrfs_trans_handle *trans,
const struct btrfs_inode *inode,
int ret),
TP_ARGS(trans, inode, ret),
TP_STRUCT__entry_btrfs(
__field( u64, root_objectid )
__field( u64, ino )
__field( u64, transid )
__field( int, ret )
),
TP_fast_assign(
TP_fast_assign_fsid(inode->root->fs_info);
__entry->root_objectid = btrfs_root_id(inode->root);
__entry->ino = btrfs_ino(inode);
__entry->transid = trans->transid;
__entry->ret = ret;
),
TP_printk_btrfs("root=%llu(%s) ino=%llu transid=%llu ret=%d",
show_root_type(__entry->root_objectid), __entry->ino,
__entry->transid, __entry->ret)
);
TRACE_EVENT(btrfs_sync_fs,
TP_PROTO(const struct btrfs_fs_info *fs_info, int wait),