diff options
Diffstat (limited to 'module/zfs/zfs_ioctl.c')
| -rw-r--r-- | module/zfs/zfs_ioctl.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c index 37a893c47..9396d6caa 100644 --- a/module/zfs/zfs_ioctl.c +++ b/module/zfs/zfs_ioctl.c @@ -247,6 +247,55 @@ static int zfs_fill_zplprops_root(uint64_t, nvlist_t *, nvlist_t *, int zfs_set_prop_nvlist(const char *, zprop_source_t, nvlist_t *, nvlist_t *); static int get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp); +#if defined(HAVE_DECLARE_EVENT_CLASS) +void +__dprintf(const char *file, const char *func, int line, const char *fmt, ...) +{ + const char *newfile; + size_t size = 4096; + char *buf = kmem_alloc(size, KM_PUSHPAGE); + char *nl; + va_list adx; + + /* + * Get rid of annoying prefix to filename. + */ + newfile = strrchr(file, '/'); + if (newfile != NULL) { + newfile = newfile + 1; /* Get rid of leading / */ + } else { + newfile = file; + } + + va_start(adx, fmt); + (void) vsnprintf(buf, size, fmt, adx); + va_end(adx); + + /* + * Get rid of trailing newline. + */ + nl = strrchr(buf, '\n'); + if (nl != NULL) + *nl = '\0'; + + /* + * To get this data enable the zfs__dprintf trace point as shown: + * + * # Enable zfs__dprintf tracepoint, clear the tracepoint ring buffer + * $ echo 1 > /sys/module/zfs/parameters/zfs_flags + * $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable + * $ echo 0 > /sys/kernel/debug/tracing/trace + * + * # Dump the ring buffer. + * $ cat /sys/kernel/debug/tracing/trace + */ + DTRACE_PROBE4(zfs__dprintf, + char *, newfile, char *, func, int, line, char *, buf); + + kmem_free(buf, size); +} +#endif /* HAVE_DECLARE_EVENT_CLASS */ + static void history_str_free(char *buf) { |