[v3,0/7] support '%pd' and '%pD' for print file name

Message

yebin (H) Jan. 23, 2024, 2:56 a.m. UTC

During fault locating, the file name needs to be printed based on the
dentry/file address. The offset needs to be calculated each time, which
is troublesome. Similar to printk, kprobe supports printing file names
for dentry/file addresses.

Diff v3 vs v2:
1. Return the index of where the suffix was found in str_has_suffix();

Diff v2 vs v1:
1. Use "%pd/%pD" print format instead of "pd/pD" print format;
2. Add "%pd/%pD" in README;
3. Expand "%pd/%pD" argument before parameter parsing;
4. Add more detail information in ftrace documentation;
5. Add test cases for new print format in selftests/ftrace;

Ye Bin (7):
  string.h: add str_has_suffix() helper for test string ends with
    specify string
  tracing/probes: add traceprobe_expand_dentry_args() helper
  tracing/probes: support '%pd' type for print struct dentry's name
  tracing/probes: support '%pD' type for print struct file's name
  tracing: add new type "%pd/%pD" in readme_msg[]
  Documentation: tracing: add new type '%pd' and '%pD' for kprobe
  selftests/ftrace: add test cases for VFS type "%pd" and "%pD"

 Documentation/trace/kprobetrace.rst           |  6 +-
 include/linux/string.h                        | 28 +++++++
 kernel/trace/trace.c                          |  2 +-
 kernel/trace/trace_kprobe.c                   |  6 ++
 kernel/trace/trace_probe.c                    | 47 +++++++++++
 kernel/trace/trace_probe.h                    |  3 +
 .../ftrace/test.d/kprobe/kprobe_args_vfs.tc   | 79 +++++++++++++++++++
 7 files changed, 169 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_vfs.tc