Commit 110acf38 authored by Steven Whitehouse's avatar Steven Whitehouse
Browse files

[GFS2] Add consts to various bits of rgrp.c 



There are a couple of routines which scan bitmaps where we can
mark the bitmaps const, plus a couple of call sites that can
be updated too.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent dbac6710

fs/gfs2/rgrp.c

+22 −22
Original line number Diff line number Diff line
@@ -126,23 +126,24 @@ static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer, 
 * Return: the block number (bitmap buffer scope) that was found

 */



static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal,

		       unsigned char old_state)

static u32 gfs2_bitfit(const u8 *buffer, unsigned int buflen, u32 goal,

		       u8 old_state)

{

	unsigned char *byte;

	const u8 *byte;

	u32 blk = goal;

	unsigned int bit, bitlong;

	unsigned long *plong, plong55;

	const unsigned long *plong;

#if BITS_PER_LONG == 32

	const unsigned long plong55 = 0x55555555;

#else

	const unsigned long plong55 = 0x5555555555555555;

#endif



	byte = buffer + (goal / GFS2_NBBY);

	plong = (unsigned long *)(buffer + (goal / GFS2_NBBY));

	plong = (const unsigned long *)(buffer + (goal / GFS2_NBBY));

	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;

	bitlong = bit;

#if BITS_PER_LONG == 32

	plong55 = 0x55555555;

#else

	plong55 = 0x5555555555555555;

#endif



	while (byte < buffer + buflen) {



		if (bitlong == 0 && old_state == 0 && *plong == plong55) {
@@ -179,14 +180,14 @@ static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal, 
 * Returns: The number of bits

 */



static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer,

			      unsigned int buflen, unsigned char state)

static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,

			 unsigned int buflen, u8 state)

{

	unsigned char *byte = buffer;

	unsigned char *end = buffer + buflen;

	unsigned char state1 = state << 2;

	unsigned char state2 = state << 4;

	unsigned char state3 = state << 6;

	const u8 *byte = buffer;

	const u8 *end = buffer + buflen;

	const u8 state1 = state << 2;

	const u8 state2 = state << 4;

	const u8 state3 = state << 6;

	u32 count = 0;



	for (; byte < end; byte++) {
@@ -1327,12 +1328,11 @@ static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal, 
	for (x = 0; x <= length; x++) {

		/* The GFS2_BLKST_UNLINKED state doesn't apply to the clone

		   bitmaps, so we must search the originals for that. */

		const u8 *buffer = bi->bi_bh->b_data + bi->bi_offset;

		if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)

			blk = gfs2_bitfit(bi->bi_clone + bi->bi_offset,

					  bi->bi_len, goal, old_state);

		else

			blk = gfs2_bitfit(bi->bi_bh->b_data + bi->bi_offset,

					  bi->bi_len, goal, old_state);

			buffer = bi->bi_clone + bi->bi_offset;



		blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);

		if (blk != BFITNOENT)

			break;

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