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libbpf-tools/filelife: Fix wrong full-path #5347

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Merged
yonghong-song merged 1 commit into from
Jul 13, 2025
Merged

libbpf-tools/filelife: Fix wrong full-path #5347

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10 changes: 3 additions & 7 deletions libbpf-tools/filelife.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@ const volatile bool full_path = false;

struct create_arg {
u64 ts;
struct dentry *cwd_dentry;
struct vfsmount *cwd_vfsmnt;
};

Expand All @@ -32,7 +31,6 @@ struct unlink_event {
__u64 delta_ns;
pid_t tgid;
struct dentry *dentry;
struct dentry *cwd_dentry;
struct vfsmount *cwd_vfsmnt;
};

Expand All @@ -57,7 +55,6 @@ probe_create(struct dentry *dentry)
task = (struct task_struct *)bpf_get_current_task_btf();

arg.ts = bpf_ktime_get_ns();
arg.cwd_dentry = BPF_CORE_READ(task, fs, pwd.dentry);
arg.cwd_vfsmnt = BPF_CORE_READ(task, fs, pwd.mnt);

bpf_map_update_elem(&start, &dentry, &arg, 0);
Expand Down Expand Up @@ -138,7 +135,6 @@ int BPF_KPROBE(vfs_unlink, void *arg0, void *arg1, void *arg2)
unlink_event.delta_ns = delta_ns;
unlink_event.tgid = tgid;
unlink_event.dentry = has_arg ? arg2 : arg1;
unlink_event.cwd_dentry = arg->cwd_dentry;
unlink_event.cwd_vfsmnt = arg->cwd_vfsmnt;

bpf_map_update_elem(&currevent, &tid, &unlink_event, BPF_ANY);
Expand Down Expand Up @@ -181,9 +177,9 @@ int BPF_KRETPROBE(vfs_unlink_ret)

/* get full-path */
if (full_path && eventp->fname.pathes[0] != '/')
bpf_dentry_full_path(eventp->fname.pathes + NAME_MAX, NAME_MAX,
MAX_PATH_DEPTH - 1,
unlink_event->cwd_dentry,
bpf_dentry_full_path(eventp->fname.pathes, NAME_MAX,
MAX_PATH_DEPTH,
unlink_event->dentry,
unlink_event->cwd_vfsmnt,
&eventp->fname.failed, &eventp->fname.depth);

Expand Down
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