At [1], Linux suggested printing full path for file instead of printing the components as '%pd'. Typically, there is no need for printk specifiers to take any real locks (ie mount_lock or rename_lock). So I introduce a new helper d_path_fast which is similar to d_path except not taking any seqlock/spinlock. The cases I tested: 1. print %pD with full path when opening a ext4 file 2. mount a ext4 filesystem upon a ext4 filesystem, and print the file with %pD 3. print the file full path which has more than 128 chars 4. all test_print selftests After this set, I noticed there are many lines which contained "%pD[234]" that should be changed to "%pD". I don't want to involve those subsystems in this patch series before the helper is satisfied with everyone. You can get the lines by $find fs/ -name \*.[ch] | xargs grep -rn "\%pD[234]" [1] https://lore.kernel.org/lkml/CAHk-=wimsMqGdzik187YWLb-ru+iktb4MYbMQG1rnZ81dXYFVg@xxxxxxxxxxxxxx/ Jia He (3): fs: introduce helper d_path_fast() lib/vsprintf.c: make %pD print full path for file s390/hmcdrv: remove the redundant directory path in debug message Documentation/core-api/printk-formats.rst | 5 ++- drivers/s390/char/hmcdrv_dev.c | 10 ++--- fs/d_path.c | 51 +++++++++++++++++------ include/linux/dcache.h | 1 + lib/vsprintf.c | 12 +++++- 5 files changed, 58 insertions(+), 21 deletions(-) -- 2.17.1
