1 files changed, 22 insertions, 8 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index f2c3ff20ea6..c5300ec3169 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -37,6 +37,8 @@
 static DEFINE_SPINLOCK(pstore_lock);
 static struct pstore_info *psinfo;
 
+static char *backend;
+
 /* How much of the console log to snapshot */
 static unsigned long kmsg_bytes = 10240;
 
@@ -67,7 +69,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
         unsigned long   size, total = 0;
         char            *dst, *why;
         u64             id;
-        int             hsize, part = 1;
+        int             hsize;
+        unsigned int    part = 1;
 
         if (reason < ARRAY_SIZE(reason_str))
                 why = reason_str[reason];
@@ -78,7 +81,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
         oopscount++;
         while (total < kmsg_bytes) {
                 dst = psinfo->buf;
-                hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part++);
+                hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
                 size = psinfo->bufsize - hsize;
                 dst += hsize;
 
@@ -94,14 +97,16 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                 memcpy(dst, s1 + s1_start, l1_cpy);
                 memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
 
-                id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy);
+                id = psinfo->write(PSTORE_TYPE_DMESG, part,
+                                   hsize + l1_cpy + l2_cpy, psinfo);
                 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);
+                                      CURRENT_TIME, psinfo);
                 l1 -= l1_cpy;
                 l2 -= l2_cpy;
                 total += l1_cpy + l2_cpy;
+                part++;
         }
         mutex_unlock(&psinfo->buf_mutex);
 }
@@ -128,6 +133,12 @@ int pstore_register(struct pstore_info *psi)
                 spin_unlock(&pstore_lock);
                 return -EBUSY;
         }
+
+        if (backend && strcmp(backend, psi->name)) {
+                spin_unlock(&pstore_lock);
+                return -EINVAL;
+        }
+
         psinfo = psi;
         spin_unlock(&pstore_lock);
 
@@ -166,9 +177,9 @@ void pstore_get_records(void)
         if (rc)
                 goto out;
 
-        while ((size = psi->read(&id, &type, &time)) > 0) {
+        while ((size = psi->read(&id, &type, &time, psi)) > 0) {
                 if (pstore_mkfile(type, psi->name, id, psi->buf, (size_t)size,
-                                  time, psi->erase))
+                                  time, psi))
                         failed++;
         }
         psi->close(psi);
@@ -196,12 +207,15 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
 
         mutex_lock(&psinfo->buf_mutex);
         memcpy(psinfo->buf, buf, size);
-        id = psinfo->write(type, size);
+        id = psinfo->write(type, 0, size, psinfo);
         if (pstore_is_mounted())
                 pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, psinfo->buf,
-                              size, CURRENT_TIME, psinfo->erase);
+                              size, CURRENT_TIME, psinfo);
         mutex_unlock(&psinfo->buf_mutex);
 
         return 0;
 }
 EXPORT_SYMBOL_GPL(pstore_write);
+
+module_param(backend, charp, 0444);
+MODULE_PARM_DESC(backend, "Pstore backend to use");