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Subject[PATCH v3 1/9] pstore: Add priv field to pstore_record for backend specific use
Date
The EFI pstore backend will need to store per-record variable name data
when we switch away from the efivars layer. Add a priv field to struct
pstore_record, and document it as holding a backend specific pointer
that is assumed to be a kmalloc()d buffer, and will be kfree()d when the
entire record is freed.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
fs/pstore/inode.c | 1 +
fs/pstore/platform.c | 1 +
include/linux/pstore.h | 4 ++++
3 files changed, 6 insertions(+)

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 14658b009f1b..ffbadb8b3032 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -55,6 +55,7 @@ static void free_pstore_private(struct pstore_private *private)
return;
if (private->record) {
kfree(private->record->buf);
+ kfree(private->record->priv);
kfree(private->record);
}
kfree(private);
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index e26162f102ff..0c034ea39954 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -769,6 +769,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
if (rc) {
/* pstore_mkfile() did not take record, so free it. */
kfree(record->buf);
+ kfree(record->priv);
kfree(record);
if (rc != -EEXIST || !quiet)
failed++;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index e97a8188f0fd..638507a3c8ff 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -57,6 +57,9 @@ struct pstore_info;
* @size: size of @buf
* @ecc_notice_size:
* ECC information for @buf
+ * @priv: pointer for backend specific use, will be
+ * kfree()d by the pstore core if non-NULL
+ * when the record is freed.
*
* Valid for PSTORE_TYPE_DMESG @type:
*
@@ -74,6 +77,7 @@ struct pstore_record {
char *buf;
ssize_t size;
ssize_t ecc_notice_size;
+ void *priv;

int count;
enum kmsg_dump_reason reason;
--
2.35.1
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