pstore: Introduce new argument 'compressed' in the read callback

Backends will set the flag 'compressed' after reading the log from
persistent store to indicate the data being returned to pstore is
compressed or not.

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>

6 files changed, 11 insertions, 7 deletions

diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index dbe5dadb5fcc..6c4dc52ac0b5 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -598,7 +598,7 @@ static int nvram_pstore_write(enum pstore_type_id type,
  */
 static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
                                 int *count, struct timespec *time, char **buf,
-                                struct pstore_info *psi)
+                                bool *compressed, struct pstore_info *psi)
 {
         struct oops_log_info *oops_hdr;
         unsigned int err_type, id_no, size = 0;
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index bcdf8cefcb9e..b412e9137e36 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -935,7 +935,7 @@ static int erst_open_pstore(struct pstore_info *psi);
 static int erst_close_pstore(struct pstore_info *psi);
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,
                            struct timespec *time, char **buf,
-                           struct pstore_info *psi);
+                           bool *compressed, struct pstore_info *psi);
 static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
                        u64 *id, unsigned int part, int count, bool compressed,
                        size_t size, struct pstore_info *psi);
@@ -991,7 +991,7 @@ static int erst_close_pstore(struct pstore_info *psi)
 
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,
                            struct timespec *time, char **buf,
-                           struct pstore_info *psi)
+                           bool *compressed, struct pstore_info *psi)
 {
         int rc;
         ssize_t len = 0;
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index fab6892f7053..9a5425f3f885 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -87,7 +87,8 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
 
 static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
                                int *count, struct timespec *timespec,
-                               char **buf, struct pstore_info *psi)
+                               char **buf, bool *compressed,
+                               struct pstore_info *psi)
 {
         struct pstore_read_data data;
 
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 56218cb35267..6418eb77d64b 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -428,6 +428,7 @@ void pstore_get_records(int quiet)
         enum pstore_type_id     type;
         struct timespec         time;
         int                     failed = 0, rc;
+        bool                    compressed;
 
         if (!psi)
                 return;
@@ -436,7 +437,8 @@ void pstore_get_records(int quiet)
         if (psi->open && psi->open(psi))
                 goto out;
 
-        while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) {
+        while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,
+                                psi)) > 0) {
                 rc = pstore_mkfile(type, psi->name, id, count, buf,
                                   (size_t)size, time, psi);
                 kfree(buf);
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index fe7188f742b7..292722327811 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -133,7 +133,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
 
 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
                                    int *count, struct timespec *time,
-                                   char **buf, struct pstore_info *psi)
+                                   char **buf, bool *compressed,
+                                   struct pstore_info *psi)
 {
         ssize_t size;
         ssize_t ecc_notice_size;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index abfca4f59422..abd437d0a8a7 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -55,7 +55,7 @@ struct pstore_info {
         int             (*close)(struct pstore_info *psi);
         ssize_t         (*read)(u64 *id, enum pstore_type_id *type,
                         int *count, struct timespec *time, char **buf,
-                        struct pstore_info *psi);
+                        bool *compressed, struct pstore_info *psi);
         int             (*write)(enum pstore_type_id type,
                         enum kmsg_dump_reason reason, u64 *id,
                         unsigned int part, int count, bool compressed,