[XFS] Use the generic bitops rather than implementing them ourselves. (79071eb0) · Commits · e / devices / android_kernel_sony_msm8994

fs/xfs/xfs_bit.c

+0 −103

Original line number	Diff line number	Diff line
		@@ -25,109 +25,6 @@
		* XFS bit manipulation routines, used in non-realtime code.
		*/

		#ifndef HAVE_ARCH_HIGHBIT
		/*
		* Index of high bit number in byte, -1 for none set, 0..7 otherwise.
		*/
		static const char xfs_highbit[256] = {
		-1, 0, 1, 1, 2, 2, 2, 2, /* 00 .. 07 */
		3, 3, 3, 3, 3, 3, 3, 3, /* 08 .. 0f */
		4, 4, 4, 4, 4, 4, 4, 4, /* 10 .. 17 */
		4, 4, 4, 4, 4, 4, 4, 4, /* 18 .. 1f */
		5, 5, 5, 5, 5, 5, 5, 5, /* 20 .. 27 */
		5, 5, 5, 5, 5, 5, 5, 5, /* 28 .. 2f */
		5, 5, 5, 5, 5, 5, 5, 5, /* 30 .. 37 */
		5, 5, 5, 5, 5, 5, 5, 5, /* 38 .. 3f */
		6, 6, 6, 6, 6, 6, 6, 6, /* 40 .. 47 */
		6, 6, 6, 6, 6, 6, 6, 6, /* 48 .. 4f */
		6, 6, 6, 6, 6, 6, 6, 6, /* 50 .. 57 */
		6, 6, 6, 6, 6, 6, 6, 6, /* 58 .. 5f */
		6, 6, 6, 6, 6, 6, 6, 6, /* 60 .. 67 */
		6, 6, 6, 6, 6, 6, 6, 6, /* 68 .. 6f */
		6, 6, 6, 6, 6, 6, 6, 6, /* 70 .. 77 */
		6, 6, 6, 6, 6, 6, 6, 6, /* 78 .. 7f */
		7, 7, 7, 7, 7, 7, 7, 7, /* 80 .. 87 */
		7, 7, 7, 7, 7, 7, 7, 7, /* 88 .. 8f */
		7, 7, 7, 7, 7, 7, 7, 7, /* 90 .. 97 */
		7, 7, 7, 7, 7, 7, 7, 7, /* 98 .. 9f */
		7, 7, 7, 7, 7, 7, 7, 7, /* a0 .. a7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* a8 .. af */
		7, 7, 7, 7, 7, 7, 7, 7, /* b0 .. b7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* b8 .. bf */
		7, 7, 7, 7, 7, 7, 7, 7, /* c0 .. c7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* c8 .. cf */
		7, 7, 7, 7, 7, 7, 7, 7, /* d0 .. d7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* d8 .. df */
		7, 7, 7, 7, 7, 7, 7, 7, /* e0 .. e7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* e8 .. ef */
		7, 7, 7, 7, 7, 7, 7, 7, /* f0 .. f7 */
		7, 7, 7, 7, 7, 7, 7, 7, /* f8 .. ff */
		};
		#endif

		/*
		* xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
		*/
		inline int
		xfs_highbit32(
		__uint32_t v)
		{
		#ifdef HAVE_ARCH_HIGHBIT
		return highbit32(v);
		#else
		int i;

		if (v & 0xffff0000)
		if (v & 0xff000000)
		i = 24;
		else
		i = 16;
		else if (v & 0x0000ffff)
		if (v & 0x0000ff00)
		i = 8;
		else
		i = 0;
		else
		return -1;
		return i + xfs_highbit[(v >> i) & 0xff];
		#endif
		}

		/*
		* xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
		*/
		int
		xfs_lowbit64(
		__uint64_t v)
		{
		__uint32_t w = (__uint32_t)v;
		int n = 0;

		if (w) { /* lower bits */
		n = ffs(w);
		} else { /* upper bits */
		w = (__uint32_t)(v >> 32);
		if (w && (n = ffs(w)))
		n += 32;
		}
		return n - 1;
		}

		/*
		* xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
		*/
		int
		xfs_highbit64(
		__uint64_t v)
		{
		__uint32_t h = (__uint32_t)(v >> 32);

		if (h)
		return xfs_highbit32(h) + 32;
		return xfs_highbit32((__uint32_t)v);
		}


		/*
		* Return whether bitmap is empty.
		* Size is number of words in the bitmap, which is padded to word boundary

fs/xfs/xfs_bit.h

+30 −4

Original line number	Diff line number	Diff line
		@@ -47,13 +47,39 @@ static inline __uint64_t xfs_mask64lo(int n)
		}

		/* Get high bit set out of 32-bit argument, -1 if none set */
		extern int xfs_highbit32(__uint32_t v);
		static inline int xfs_highbit32(__uint32_t v)
		{
		return fls(v) - 1;
		}

		/* Get high bit set out of 64-bit argument, -1 if none set */
		static inline int xfs_highbit64(__uint64_t v)
		{
		return fls64(v) - 1;
		}

		/* Get low bit set out of 32-bit argument, -1 if none set */
		static inline int xfs_lowbit32(__uint32_t v)
		{
		unsigned long t = v;
		return (v) ? find_first_bit(&t, 32) : -1;
		}

		/* Get low bit set out of 64-bit argument, -1 if none set */
		extern int xfs_lowbit64(__uint64_t v);
		static inline int xfs_lowbit64(__uint64_t v)
		{
		__uint32_t w = (__uint32_t)v;
		int n = 0;

		/* Get high bit set out of 64-bit argument, -1 if none set */
		extern int xfs_highbit64(__uint64_t);
		if (w) { /* lower bits */
		n = ffs(w);
		} else { /* upper bits */
		w = (__uint32_t)(v >> 32);
		if (w && (n = ffs(w)))
		n += 32;
		}
		return n - 1;
		}

		/* Return whether bitmap is empty (1 == empty) */
		extern int xfs_bitmap_empty(uint *map, uint size);

fs/xfs/xfs_rtalloc.c

+7 −12

Original line number	Diff line number	Diff line
		@@ -73,18 +73,6 @@ STATIC int xfs_rtmodify_summary(xfs_mount_t , xfs_trans_t , int,
		* Internal functions.
		*/

		/*
		* xfs_lowbit32: get low bit set out of 32-bit argument, -1 if none set.
		*/
		STATIC int
		xfs_lowbit32(
		__uint32_t v)
		{
		if (v)
		return ffs(v) - 1;
		return -1;
		}

		/*
		* Allocate space to the bitmap or summary file, and zero it, for growfs.
		*/
		@@ -450,6 +438,7 @@ xfs_rtallocate_extent_near(
		}
		bbno = XFS_BITTOBLOCK(mp, bno);
		i = 0;
		ASSERT(minlen != 0);
		log2len = xfs_highbit32(minlen);
		/*
		* Loop over all bitmap blocks (bbno + i is current block).
		@@ -618,6 +607,8 @@ xfs_rtallocate_extent_size(
		xfs_suminfo_t sum; /* summary information for extents */

		ASSERT(minlen % prod == 0 && maxlen % prod == 0);
		ASSERT(maxlen != 0);

		/*
		* Loop over all the levels starting with maxlen.
		* At each level, look at all the bitmap blocks, to see if there
		@@ -675,6 +666,9 @@ xfs_rtallocate_extent_size(
		*rtblock = NULLRTBLOCK;
		return 0;
		}
		ASSERT(minlen != 0);
		ASSERT(maxlen != 0);

		/*
		* Loop over sizes, from maxlen down to minlen.
		* This time, when we do the allocations, allow smaller ones
		@@ -1961,6 +1955,7 @@ xfs_growfs_rt(
		nsbp->sb_blocksize * nsbp->sb_rextsize);
		nsbp->sb_rextents = nsbp->sb_rblocks;
		do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
		ASSERT(nsbp->sb_rextents != 0);
		nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
		nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
		nrsumsize =