[GFS2] Merge bits.[ch] into rgrp.c

Since they are small and will be inlined by the complier,
it makes sense to merge the contents of bits.[ch] into
rgrp.c

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

@@ -19,7 +19,6 @@
 #include "gfs2.h"
 #include "lm_interface.h"
 #include "incore.h"
-#include "bits.h"
 #include "glock.h"
 #include "glops.h"
 #include "lops.h"
@@ -31,6 +30,167 @@
 #include "ops_file.h"
 #include "util.h"
 
+#define BFITNOENT 0xFFFFFFFF
+
+/*
+ * These routines are used by the resource group routines (rgrp.c)
+ * to keep track of block allocation.  Each block is represented by two
+ * bits.  One bit indicates whether or not the block is used.  (1=used,
+ * 0=free)  The other bit indicates whether or not the block contains a
+ * dinode or not.  (1=dinode, 0=not-dinode) So, each byte represents
+ * GFS2_NBBY (i.e. 4) blocks.
+ */
+
+static const char valid_change[16] = {
+	        /* current */
+	/* n */ 0, 1, 0, 1,
+	/* e */ 1, 0, 0, 0,
+	/* w */ 0, 0, 0, 0,
+	        1, 0, 0, 0
+};
+
+/**
+ * gfs2_setbit - Set a bit in the bitmaps
+ * @buffer: the buffer that holds the bitmaps
+ * @buflen: the length (in bytes) of the buffer
+ * @block: the block to set
+ * @new_state: the new state of the block
+ *
+ */
+
+void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
+		 unsigned int buflen, uint32_t block, unsigned char new_state)
+{
+	unsigned char *byte, *end, cur_state;
+	unsigned int bit;
+
+	byte = buffer + (block / GFS2_NBBY);
+	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
+	end = buffer + buflen;
+
+	gfs2_assert(rgd->rd_sbd, byte < end);
+
+	cur_state = (*byte >> bit) & GFS2_BIT_MASK;
+
+	if (valid_change[new_state * 4 + cur_state]) {
+		*byte ^= cur_state << bit;
+		*byte |= new_state << bit;
+	} else
+		gfs2_consist_rgrpd(rgd);
+}
+
+/**
+ * gfs2_testbit - test a bit in the bitmaps
+ * @buffer: the buffer that holds the bitmaps
+ * @buflen: the length (in bytes) of the buffer
+ * @block: the block to read
+ *
+ */
+
+unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
+			   unsigned int buflen, uint32_t block)
+{
+	unsigned char *byte, *end, cur_state;
+	unsigned int bit;
+
+	byte = buffer + (block / GFS2_NBBY);
+	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
+	end = buffer + buflen;
+
+	gfs2_assert(rgd->rd_sbd, byte < end);
+
+	cur_state = (*byte >> bit) & GFS2_BIT_MASK;
+
+	return cur_state;
+}
+
+/**
+ * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
+ *       a block in a given allocation state.
+ * @buffer: the buffer that holds the bitmaps
+ * @buflen: the length (in bytes) of the buffer
+ * @goal: start search at this block's bit-pair (within @buffer)
+ * @old_state: GFS2_BLKST_XXX the state of the block we're looking for;
+ *       bit 0 = alloc(1)/free(0), bit 1 = meta(1)/data(0)
+ *
+ * Scope of @goal and returned block number is only within this bitmap buffer,
+ * not entire rgrp or filesystem.  @buffer will be offset from the actual
+ * beginning of a bitmap block buffer, skipping any header structures.
+ *
+ * Return: the block number (bitmap buffer scope) that was found
+ */
+
+uint32_t gfs2_bitfit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
+		     unsigned int buflen, uint32_t goal,
+		     unsigned char old_state)
+{
+	unsigned char *byte, *end, alloc;
+	uint32_t blk = goal;
+	unsigned int bit;
+
+	byte = buffer + (goal / GFS2_NBBY);
+	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
+	end = buffer + buflen;
+	alloc = (old_state & 1) ? 0 : 0x55;
+
+	while (byte < end) {
+		if ((*byte & 0x55) == alloc) {
+			blk += (8 - bit) >> 1;
+
+			bit = 0;
+			byte++;
+
+			continue;
+		}
+
+		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
+			return blk;
+
+		bit += GFS2_BIT_SIZE;
+		if (bit >= 8) {
+			bit = 0;
+			byte++;
+		}
+
+		blk++;
+	}
+
+	return BFITNOENT;
+}
+
+/**
+ * gfs2_bitcount - count the number of bits in a certain state
+ * @buffer: the buffer that holds the bitmaps
+ * @buflen: the length (in bytes) of the buffer
+ * @state: the state of the block we're looking for
+ *
+ * Returns: The number of bits
+ */
+
+uint32_t gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer,
+		       unsigned int buflen, unsigned char 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;
+	uint32_t count = 0;
+
+	for (; byte < end; byte++) {
+		if (((*byte) & 0x03) == state)
+			count++;
+		if (((*byte) & 0x0C) == state1)
+			count++;
+		if (((*byte) & 0x30) == state2)
+			count++;
+		if (((*byte) & 0xC0) == state3)
+			count++;
+	}
+
+	return count;
+}
+
 /**
  * gfs2_rgrp_verify - Verify that a resource group is consistent
  * @sdp: the filesystem