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-rw-r--r--include/linux/jbd2.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 3efc43f3f16..1be23d9fdac 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1096,7 +1096,6 @@ extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
void jbd2_journal_set_triggers(struct buffer_head *,
struct jbd2_buffer_trigger_type *type);
extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
-extern void jbd2_journal_release_buffer (handle_t *, struct buffer_head *);
extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
extern void journal_sync_buffer (struct buffer_head *);
extern void jbd2_journal_invalidatepage(journal_t *,
@@ -1303,15 +1302,21 @@ static inline int jbd_space_needed(journal_t *journal)
extern int jbd_blocks_per_page(struct inode *inode);
+/* JBD uses a CRC32 checksum */
+#define JBD_MAX_CHECKSUM_SIZE 4
+
static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
const void *address, unsigned int length)
{
struct {
struct shash_desc shash;
- char ctx[crypto_shash_descsize(journal->j_chksum_driver)];
+ char ctx[JBD_MAX_CHECKSUM_SIZE];
} desc;
int err;
+ BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) >
+ JBD_MAX_CHECKSUM_SIZE);
+
desc.shash.tfm = journal->j_chksum_driver;
desc.shash.flags = 0;
*(u32 *)desc.ctx = crc;