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authorSteven Whitehouse <swhiteho@redhat.com>2008-01-29 08:30:20 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2008-03-31 05:40:21 -0400
commit110acf38377b5b341b11644bfe98389eccec627d (patch)
treecafe58b50d12c9102d061d0d9b668e1f78342849 /fs/gfs2
parentdbac6710a6dfcec7fbe7d9571c183d86a4237623 (diff)
[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: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/rgrp.c44
1 files changed, 22 insertions, 22 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index da60ce8c5d7d..5fd87104e595 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -126,23 +126,24 @@ static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
126 * Return: the block number (bitmap buffer scope) that was found 126 * Return: the block number (bitmap buffer scope) that was found
127 */ 127 */
128 128
129static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal, 129static u32 gfs2_bitfit(const u8 *buffer, unsigned int buflen, u32 goal,
130 unsigned char old_state) 130 u8 old_state)
131{ 131{
132 unsigned char *byte; 132 const u8 *byte;
133 u32 blk = goal; 133 u32 blk = goal;
134 unsigned int bit, bitlong; 134 unsigned int bit, bitlong;
135 unsigned long *plong, plong55; 135 const unsigned long *plong;
136#if BITS_PER_LONG == 32
137 const unsigned long plong55 = 0x55555555;
138#else
139 const unsigned long plong55 = 0x5555555555555555;
140#endif
136 141
137 byte = buffer + (goal / GFS2_NBBY); 142 byte = buffer + (goal / GFS2_NBBY);
138 plong = (unsigned long *)(buffer + (goal / GFS2_NBBY)); 143 plong = (const unsigned long *)(buffer + (goal / GFS2_NBBY));
139 bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE; 144 bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
140 bitlong = bit; 145 bitlong = bit;
141#if BITS_PER_LONG == 32 146
142 plong55 = 0x55555555;
143#else
144 plong55 = 0x5555555555555555;
145#endif
146 while (byte < buffer + buflen) { 147 while (byte < buffer + buflen) {
147 148
148 if (bitlong == 0 && old_state == 0 && *plong == plong55) { 149 if (bitlong == 0 && old_state == 0 && *plong == plong55) {
@@ -179,14 +180,14 @@ static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal,
179 * Returns: The number of bits 180 * Returns: The number of bits
180 */ 181 */
181 182
182static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer, 183static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
183 unsigned int buflen, unsigned char state) 184 unsigned int buflen, u8 state)
184{ 185{
185 unsigned char *byte = buffer; 186 const u8 *byte = buffer;
186 unsigned char *end = buffer + buflen; 187 const u8 *end = buffer + buflen;
187 unsigned char state1 = state << 2; 188 const u8 state1 = state << 2;
188 unsigned char state2 = state << 4; 189 const u8 state2 = state << 4;
189 unsigned char state3 = state << 6; 190 const u8 state3 = state << 6;
190 u32 count = 0; 191 u32 count = 0;
191 192
192 for (; byte < end; byte++) { 193 for (; byte < end; byte++) {
@@ -1327,12 +1328,11 @@ static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
1327 for (x = 0; x <= length; x++) { 1328 for (x = 0; x <= length; x++) {
1328 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone 1329 /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
1329 bitmaps, so we must search the originals for that. */ 1330 bitmaps, so we must search the originals for that. */
1331 const u8 *buffer = bi->bi_bh->b_data + bi->bi_offset;
1330 if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone) 1332 if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
1331 blk = gfs2_bitfit(bi->bi_clone + bi->bi_offset, 1333 buffer = bi->bi_clone + bi->bi_offset;
1332 bi->bi_len, goal, old_state); 1334
1333 else 1335 blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
1334 blk = gfs2_bitfit(bi->bi_bh->b_data + bi->bi_offset,
1335 bi->bi_len, goal, old_state);
1336 if (blk != BFITNOENT) 1336 if (blk != BFITNOENT)
1337 break; 1337 break;
1338 1338