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jbd2: remove VLAIS usage from JBD2 code

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The use of variable length arrays in structs (VLAIS) in the Linux Kernel code
precludes the use of compilers which don't implement VLAIS (for instance the
Clang compiler). Since ctx is always a 32-bit CRC, hard coding a size of 4
bytes accomplishes the same thing without the use of VLAIS. This is the same
technique already employed in fs/ext4/ext4.h

Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Behan Webster 2012-11-08 11:24:46 -05:00 committed by Theodore Ts'o
parent 37be2f59d3
commit fd47d3e1c2
1 changed files with 7 additions and 1 deletions
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8
include/linux/jbd2.h
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@ -1302,15 +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;