pstore: Add new argument 'compressed' in pstore write callback

Addition of new argument 'compressed' in the write call back will
help the backend to know if the data passed from pstore is compressed
or not (In case where compression fails.). If compressed, the backend
can add a tag indicating the data is compressed while writing to
persistent store.

Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

2 files changed, 5 insertions, 4 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 422962ae9fc2..20fa686f80fa 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -149,6 +149,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                 unsigned long size;
                 int hsize;
                 size_t len;
+                bool compressed = false;
 
                 dst = psinfo->buf;
                 hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
@@ -159,7 +160,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                         break;
 
                 ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
-                                    oopscount, hsize, hsize + len, psinfo);
+                                    oopscount, compressed, hsize + len, psinfo);
                 if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
                         pstore_new_entry = 1;
 
@@ -221,10 +222,10 @@ static void pstore_register_console(void) {}
 static int pstore_write_compat(enum pstore_type_id type,
                                enum kmsg_dump_reason reason,
                                u64 *id, unsigned int part, int count,
-                               size_t hsize, size_t size,
+                               bool compressed, size_t size,
                                struct pstore_info *psi)
 {
-        return psi->write_buf(type, reason, id, part, psinfo->buf, hsize,
+        return psi->write_buf(type, reason, id, part, psinfo->buf, compressed,
                              size, psi);
 }
 
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index a6119f9469e2..fe7188f742b7 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -196,7 +196,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
                                             enum kmsg_dump_reason reason,
                                             u64 *id, unsigned int part,
                                             const char *buf,
-                                            size_t hsize, size_t size,
+                                            bool compressed, size_t size,
                                             struct pstore_info *psi)
 {
         struct ramoops_context *cxt = psi->data;