pstore: cleanups to pstore_dump()

pstore_dump() can be called with many different "reason" codes. Save
the name of the code in the persistent store record.

Also - only worthwhile calling pstore_mkfile for KMSG_DUMP_OOPS - that
is the only one where the kernel will continue running.

Reviewed-by: Seiji Aguchi <seiji.aguchi@hds.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index ce9ad84d5dd9..f835a25625ff 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -48,6 +48,10 @@ void pstore_set_kmsg_bytes(int bytes)
 /* Tag each group of saved records with a sequence number */
 static int      oopscount;
 
+static char *reason_str[] = {
+        "Oops", "Panic", "Kexec", "Restart", "Halt", "Poweroff", "Emergency"
+};
+
 /*
  * callback from kmsg_dump. (s2,l2) has the most recently
  * written bytes, older bytes are in (s1,l1). Save as much
@@ -61,15 +65,20 @@ static void pstore_dump(struct kmsg_dumper *dumper,
         unsigned long   s1_start, s2_start;
         unsigned long   l1_cpy, l2_cpy;
         unsigned long   size, total = 0;
-        char            *dst;
+        char            *dst, *why;
         u64             id;
         int             hsize, part = 1;
 
+        if (reason < ARRAY_SIZE(reason_str))
+                why = reason_str[reason];
+        else
+                why = "Unknown";
+
         mutex_lock(&psinfo->buf_mutex);
         oopscount++;
         while (total < kmsg_bytes) {
                 dst = psinfo->buf;
-                hsize = sprintf(dst, "Oops#%d Part%d\n", oopscount, part++);
+                hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part++);
                 size = psinfo->bufsize - hsize;
                 dst += hsize;
 
@@ -86,7 +95,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                 memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
 
                 id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy);
-                if (pstore_is_mounted())
+                if (reason == KMSG_DUMP_OOPS && pstore_is_mounted())
                         pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id,
                                       psinfo->buf, hsize + l1_cpy + l2_cpy,
                                       CURRENT_TIME, psinfo->erase);