From 01b5adcebb977bc61b64167adce6d8260c9da33c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Sun, 27 May 2012 07:50:56 -0400 Subject: jbd2: Grab a reference to the crc32c driver if necessary Obtain a reference to the crc32c driver if needed for the v2 checksum. Signed-off-by: Darrick J. Wong Signed-off-by: "Theodore Ts'o" --- include/linux/jbd2.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'include/linux') diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index 809c439066c5..71e77dddebf1 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -31,6 +31,7 @@ #include #include #include +#include #endif #define journal_oom_retry 1 @@ -965,6 +966,9 @@ struct journal_s * superblock pointer here */ void *j_private; + + /* Reference to checksum algorithm driver via cryptoapi */ + struct crypto_shash *j_chksum_driver; }; /* @@ -1294,6 +1298,25 @@ static inline int jbd_space_needed(journal_t *journal) extern int jbd_blocks_per_page(struct inode *inode); +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)]; + } desc; + int err; + + desc.shash.tfm = journal->j_chksum_driver; + desc.shash.flags = 0; + *(u32 *)desc.ctx = crc; + + err = crypto_shash_update(&desc.shash, address, length); + BUG_ON(err); + + return *(u32 *)desc.ctx; +} + #ifdef __KERNEL__ #define buffer_trace_init(bh) do {} while (0) -- cgit v1.2.3-71-gd317