[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>

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,
  * 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;