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Date: Fri, 21 Sep 2007 03:21:47 -0700
From: akpm@...ux-foundation.org
To: mm-commits@...r.kernel.org
Cc: aneesh.kumar@...ux.vnet.ibm.com, linux-ext4@...r.kernel.org
Subject: + introduce-ext4_find_next_bit.patch added to -mm tree
The patch titled
Introduce ext4_find_next_bit
has been added to the -mm tree. Its filename is
introduce-ext4_find_next_bit.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Introduce ext4_find_next_bit
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Also add generic_find_next_le_bit
This gets used by the ext4 multi block allocator patches.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Cc: <linux-ext4@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
include/asm-generic/bitops/ext2-non-atomic.h | 2
include/asm-generic/bitops/le.h | 4 +
include/asm-powerpc/bitops.h | 4 +
include/linux/ext4_fs.h | 1
lib/find_next_bit.c | 44 +++++++++++++++++
5 files changed, 55 insertions(+)
diff -puN include/asm-generic/bitops/ext2-non-atomic.h~introduce-ext4_find_next_bit include/asm-generic/bitops/ext2-non-atomic.h
--- a/include/asm-generic/bitops/ext2-non-atomic.h~introduce-ext4_find_next_bit
+++ a/include/asm-generic/bitops/ext2-non-atomic.h
@@ -14,5 +14,7 @@
generic_find_first_zero_le_bit((unsigned long *)(addr), (size))
#define ext2_find_next_zero_bit(addr, size, off) \
generic_find_next_zero_le_bit((unsigned long *)(addr), (size), (off))
+#define ext2_find_next_bit(addr, size, off) \
+ generic_find_next_le_bit((unsigned long *)(addr), (size), (off))
#endif /* _ASM_GENERIC_BITOPS_EXT2_NON_ATOMIC_H_ */
diff -puN include/asm-generic/bitops/le.h~introduce-ext4_find_next_bit include/asm-generic/bitops/le.h
--- a/include/asm-generic/bitops/le.h~introduce-ext4_find_next_bit
+++ a/include/asm-generic/bitops/le.h
@@ -20,6 +20,8 @@
#define generic___test_and_clear_le_bit(nr, addr) __test_and_clear_bit(nr, addr)
#define generic_find_next_zero_le_bit(addr, size, offset) find_next_zero_bit(addr, size, offset)
+#define generic_find_next_le_bit(addr, size, offset) \
+ find_next_bit(addr, size, offset)
#elif defined(__BIG_ENDIAN)
@@ -42,6 +44,8 @@
extern unsigned long generic_find_next_zero_le_bit(const unsigned long *addr,
unsigned long size, unsigned long offset);
+extern unsigned long generic_find_next_le_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset);
#else
#error "Please fix <asm/byteorder.h>"
diff -puN include/asm-powerpc/bitops.h~introduce-ext4_find_next_bit include/asm-powerpc/bitops.h
--- a/include/asm-powerpc/bitops.h~introduce-ext4_find_next_bit
+++ a/include/asm-powerpc/bitops.h
@@ -310,6 +310,8 @@ static __inline__ int test_le_bit(unsign
unsigned long generic_find_next_zero_le_bit(const unsigned long *addr,
unsigned long size, unsigned long offset);
+unsigned long generic_find_next_le_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset);
/* Bitmap functions for the ext2 filesystem */
#define ext2_set_bit(nr,addr) \
@@ -329,6 +331,8 @@ unsigned long generic_find_next_zero_le_
#define ext2_find_next_zero_bit(addr, size, off) \
generic_find_next_zero_le_bit((unsigned long*)addr, size, off)
+#define ext2_find_next_bit(addr, size, off) \
+ generic_find_next_le_bit((unsigned long *)addr, size, off)
/* Bitmap functions for the minix filesystem. */
#define minix_test_and_set_bit(nr,addr) \
diff -puN include/linux/ext4_fs.h~introduce-ext4_find_next_bit include/linux/ext4_fs.h
--- a/include/linux/ext4_fs.h~introduce-ext4_find_next_bit
+++ a/include/linux/ext4_fs.h
@@ -492,6 +492,7 @@ do { \
#define ext4_test_bit ext2_test_bit
#define ext4_find_first_zero_bit ext2_find_first_zero_bit
#define ext4_find_next_zero_bit ext2_find_next_zero_bit
+#define ext4_find_next_bit ext2_find_next_bit
/*
* Maximal mount counts between two filesystem checks
diff -puN lib/find_next_bit.c~introduce-ext4_find_next_bit lib/find_next_bit.c
--- a/lib/find_next_bit.c~introduce-ext4_find_next_bit
+++ a/lib/find_next_bit.c
@@ -178,4 +178,48 @@ found_middle_swap:
EXPORT_SYMBOL(generic_find_next_zero_le_bit);
+unsigned long generic_find_next_le_bit(const unsigned long *addr, unsigned
+ long size, unsigned long offset)
+{
+ const unsigned long *p = addr + BITOP_WORD(offset);
+ unsigned long result = offset & ~(BITS_PER_LONG - 1);
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= (BITS_PER_LONG - 1UL);
+ if (offset) {
+ tmp = ext2_swabp(p++);
+ tmp &= (~0UL << offset);
+ if (size < BITS_PER_LONG)
+ goto found_first;
+ if (tmp)
+ goto found_middle;
+ size -= BITS_PER_LONG;
+ result += BITS_PER_LONG;
+ }
+
+ while (size & ~(BITS_PER_LONG - 1)) {
+ tmp = *(p++);
+ if (tmp)
+ goto found_middle_swap;
+ result += BITS_PER_LONG;
+ size -= BITS_PER_LONG;
+ }
+ if (!size)
+ return result;
+ tmp = ext2_swabp(p);
+found_first:
+ tmp &= (~0UL >> (BITS_PER_LONG - size));
+ if (tmp == 0UL) /* Are any bits set? */
+ return result + size; /* Nope. */
+found_middle:
+ return result + __ffs(tmp);
+
+found_middle_swap:
+ return result + __ffs(ext2_swab(tmp));
+}
+EXPORT_SYMBOL(generic_find_next_le_bit);
+
#endif /* __BIG_ENDIAN */
_
Patches currently in -mm which might be from aneesh.kumar@...ux.vnet.ibm.com are
ext2-ext3-ext4-add-block-bitmap-validation.patch
ext2-ext3-ext4-add-block-bitmap-validation-fix.patch
ext4-uninitialized-block-groups.patch
ext4-uninitialized-block-groups-fix.patch
introduce-ext4_find_next_bit.patch
-
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