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Diffstat (limited to 'e2fsprogs/ext2fs/bitops.h')
-rw-r--r--e2fsprogs/ext2fs/bitops.h617
1 files changed, 617 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/bitops.h b/e2fsprogs/ext2fs/bitops.h
new file mode 100644
index 0000000..b223809
--- /dev/null
+++ b/e2fsprogs/ext2fs/bitops.h
@@ -0,0 +1,617 @@
+/*
+ * bitops.h --- Bitmap frobbing code. The byte swapping routines are
+ * also included here.
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ *
+ * i386 bitops operations taken from <asm/bitops.h>, Copyright 1992,
+ * Linus Torvalds.
+ */
+
+
+extern int ext2fs_set_bit(int nr,void * addr);
+extern int ext2fs_clear_bit(int nr, void * addr);
+extern int ext2fs_test_bit(int nr, const void * addr);
+extern __u16 ext2fs_swab16(__u16 val);
+extern __u32 ext2fs_swab32(__u32 val);
+
+#ifdef WORDS_BIGENDIAN
+#define ext2fs_cpu_to_le32(x) ext2fs_swab32((x))
+#define ext2fs_le32_to_cpu(x) ext2fs_swab32((x))
+#define ext2fs_cpu_to_le16(x) ext2fs_swab16((x))
+#define ext2fs_le16_to_cpu(x) ext2fs_swab16((x))
+#define ext2fs_cpu_to_be32(x) ((__u32)(x))
+#define ext2fs_be32_to_cpu(x) ((__u32)(x))
+#define ext2fs_cpu_to_be16(x) ((__u16)(x))
+#define ext2fs_be16_to_cpu(x) ((__u16)(x))
+#else
+#define ext2fs_cpu_to_le32(x) ((__u32)(x))
+#define ext2fs_le32_to_cpu(x) ((__u32)(x))
+#define ext2fs_cpu_to_le16(x) ((__u16)(x))
+#define ext2fs_le16_to_cpu(x) ((__u16)(x))
+#define ext2fs_cpu_to_be32(x) ext2fs_swab32((x))
+#define ext2fs_be32_to_cpu(x) ext2fs_swab32((x))
+#define ext2fs_cpu_to_be16(x) ext2fs_swab16((x))
+#define ext2fs_be16_to_cpu(x) ext2fs_swab16((x))
+#endif
+
+/*
+ * EXT2FS bitmap manipulation routines.
+ */
+
+/* Support for sending warning messages from the inline subroutines */
+extern const char *ext2fs_block_string;
+extern const char *ext2fs_inode_string;
+extern const char *ext2fs_mark_string;
+extern const char *ext2fs_unmark_string;
+extern const char *ext2fs_test_string;
+extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
+ const char *description);
+extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
+ int code, unsigned long arg);
+
+extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
+extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block);
+extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
+
+extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
+extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode);
+extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
+
+extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block);
+extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block);
+extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block);
+
+extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode);
+extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode);
+extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode);
+extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
+extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap);
+extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap);
+extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
+
+extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num);
+extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map);
+
+/* These two routines moved to gen_bitmap.c */
+extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
+ __u32 bitno);
+extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
+ blk_t bitno);
+/*
+ * The inline routines themselves...
+ *
+ * If NO_INLINE_FUNCS is defined, then we won't try to do inline
+ * functions at all; they will be included as normal functions in
+ * inline.c
+ */
+#ifdef NO_INLINE_FUNCS
+#if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \
+ defined(__i586__) || defined(__mc68000__) || \
+ defined(__sparc__)))
+ /* This prevents bitops.c from trying to include the C */
+ /* function version of these functions */
+#define _EXT2_HAVE_ASM_BITOPS_
+#endif
+#endif /* NO_INLINE_FUNCS */
+
+#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
+#ifdef INCLUDE_INLINE_FUNCS
+#define _INLINE_ extern
+#else
+#ifdef __GNUC__
+#define _INLINE_ extern __inline__
+#else /* For Watcom C */
+#define _INLINE_ extern inline
+#endif
+#endif
+
+#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
+ (defined(__i386__) || defined(__i486__) || defined(__i586__)))
+
+#define _EXT2_HAVE_ASM_BITOPS_
+#define _EXT2_HAVE_ASM_SWAB_
+#define _EXT2_HAVE_ASM_FINDBIT_
+
+/*
+ * These are done by inline assembly for speed reasons.....
+ *
+ * All bitoperations return 0 if the bit was cleared before the
+ * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32
+ * is the LSB of (addr+1).
+ */
+
+/*
+ * Some hacks to defeat gcc over-optimizations..
+ */
+struct __dummy_h { unsigned long a[100]; };
+#define EXT2FS_ADDR (*(struct __dummy_h *) addr)
+#define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr)
+
+_INLINE_ int ext2fs_set_bit(int nr, void * addr)
+{
+ int oldbit;
+
+ __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0"
+ :"=r" (oldbit),"=m" (EXT2FS_ADDR)
+ :"r" (nr));
+ return oldbit;
+}
+
+_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
+{
+ int oldbit;
+
+ __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0"
+ :"=r" (oldbit),"=m" (EXT2FS_ADDR)
+ :"r" (nr));
+ return oldbit;
+}
+
+_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
+{
+ int oldbit;
+
+ __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
+ :"=r" (oldbit)
+ :"m" (EXT2FS_CONST_ADDR),"r" (nr));
+ return oldbit;
+}
+
+#if 0
+_INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
+{
+ int d0, d1, d2;
+ int res;
+
+ if (!size)
+ return 0;
+ /* This looks at memory. Mark it volatile to tell gcc not to move it around */
+ __asm__ __volatile__(
+ "cld\n\t"
+ "xorl %%eax,%%eax\n\t"
+ "xorl %%edx,%%edx\n\t"
+ "repe; scasl\n\t"
+ "je 1f\n\t"
+ "movl -4(%%edi),%%eax\n\t"
+ "subl $4,%%edi\n\t"
+ "bsfl %%eax,%%edx\n"
+ "1:\tsubl %%esi,%%edi\n\t"
+ "shll $3,%%edi\n\t"
+ "addl %%edi,%%edx"
+ :"=d" (res), "=&c" (d0), "=&D" (d1), "=&a" (d2)
+ :"1" ((size + 31) >> 5), "2" (addr), "S" (addr));
+ return res;
+}
+
+_INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
+{
+ unsigned long * p = ((unsigned long *) addr) + (offset >> 5);
+ int set = 0, bit = offset & 31, res;
+
+ if (bit) {
+ /*
+ * Look for zero in first byte
+ */
+ __asm__("bsfl %1,%0\n\t"
+ "jne 1f\n\t"
+ "movl $32, %0\n"
+ "1:"
+ : "=r" (set)
+ : "r" (*p >> bit));
+ if (set < (32 - bit))
+ return set + offset;
+ set = 32 - bit;
+ p++;
+ }
+ /*
+ * No bit found yet, search remaining full bytes for a bit
+ */
+ res = ext2fs_find_first_bit_set(p, size - 32 * (p - (unsigned long *) addr));
+ return (offset + set + res);
+}
+#endif
+
+#ifdef EXT2FS_ENABLE_SWAPFS
+_INLINE_ __u32 ext2fs_swab32(__u32 val)
+{
+#ifdef EXT2FS_REQUIRE_486
+ __asm__("bswap %0" : "=r" (val) : "0" (val));
+#else
+ __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
+ "rorl $16,%0\n\t" /* swap words */
+ "xchgb %b0,%h0" /* swap higher bytes */
+ :"=q" (val)
+ : "0" (val));
+#endif
+ return val;
+}
+
+_INLINE_ __u16 ext2fs_swab16(__u16 val)
+{
+ __asm__("xchgb %b0,%h0" /* swap bytes */ \
+ : "=q" (val) \
+ : "0" (val)); \
+ return val;
+}
+#endif
+
+#undef EXT2FS_ADDR
+
+#endif /* i386 */
+
+#ifdef __mc68000__
+
+#define _EXT2_HAVE_ASM_BITOPS_
+
+_INLINE_ int ext2fs_set_bit(int nr,void * addr)
+{
+ char retval;
+
+ __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
+ : "=d" (retval) : "d" (nr^7), "a" (addr));
+
+ return retval;
+}
+
+_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
+{
+ char retval;
+
+ __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
+ : "=d" (retval) : "d" (nr^7), "a" (addr));
+
+ return retval;
+}
+
+_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
+{
+ char retval;
+
+ __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0"
+ : "=d" (retval) : "d" (nr^7), "a" (addr));
+
+ return retval;
+}
+
+#endif /* __mc68000__ */
+
+
+#if !defined(_EXT2_HAVE_ASM_SWAB_) && defined(EXT2FS_ENABLE_SWAPFS)
+
+_INLINE_ __u16 ext2fs_swab16(__u16 val)
+{
+ return (val >> 8) | (val << 8);
+}
+
+_INLINE_ __u32 ext2fs_swab32(__u32 val)
+{
+ return ((val>>24) | ((val>>8)&0xFF00) |
+ ((val<<8)&0xFF0000) | (val<<24));
+}
+
+#endif /* !_EXT2_HAVE_ASM_SWAB */
+
+#if !defined(_EXT2_HAVE_ASM_FINDBIT_)
+_INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
+{
+ char *cp = (unsigned char *) addr;
+ int res = 0, d0;
+
+ if (!size)
+ return 0;
+
+ while ((size > res) && (*cp == 0)) {
+ cp++;
+ res += 8;
+ }
+ d0 = ffs(*cp);
+ if (d0 == 0)
+ return size;
+
+ return res + d0 - 1;
+}
+
+_INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
+{
+ unsigned char * p;
+ int set = 0, bit = offset & 7, res = 0, d0;
+
+ res = offset >> 3;
+ p = ((unsigned char *) addr) + res;
+
+ if (bit) {
+ set = ffs(*p & ~((1 << bit) - 1));
+ if (set)
+ return (offset & ~7) + set - 1;
+ p++;
+ res += 8;
+ }
+ while ((size > res) && (*p == 0)) {
+ p++;
+ res += 8;
+ }
+ d0 = ffs(*p);
+ if (d0 == 0)
+ return size;
+
+ return (res + d0 - 1);
+}
+#endif
+
+_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
+ blk_t bitno);
+
+_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
+ blk_t bitno)
+{
+ if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
+ ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
+ return 0;
+ }
+ return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+ return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)
+ bitmap,
+ block);
+}
+
+_INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+ return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
+ block);
+}
+
+_INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+ return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
+ block);
+}
+
+_INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+ return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
+ inode);
+}
+
+_INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+ return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
+ inode);
+}
+
+_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+ return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
+ inode);
+}
+
+_INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
+ bitmap->description);
+ return;
+ }
+#endif
+ ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK,
+ block, bitmap->description);
+ return;
+ }
+#endif
+ ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
+ blk_t block)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
+ block, bitmap->description);
+ return 0;
+ }
+#endif
+ return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((inode < bitmap->start) || (inode > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK,
+ inode, bitmap->description);
+ return;
+ }
+#endif
+ ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((inode < bitmap->start) || (inode > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK,
+ inode, bitmap->description);
+ return;
+ }
+#endif
+ ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t inode)
+{
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((inode < bitmap->start) || (inode > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
+ inode, bitmap->description);
+ return 0;
+ }
+#endif
+ return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
+{
+ return bitmap->start;
+}
+
+_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
+{
+ return bitmap->start;
+}
+
+_INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
+{
+ return bitmap->end;
+}
+
+_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
+{
+ return bitmap->end;
+}
+
+_INLINE_ int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
+ block, bitmap->description);
+ return 0;
+ }
+ for (i=0; i < num; i++) {
+ if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
+ return 0;
+ }
+ return 1;
+}
+
+_INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
+ block, bitmap->description);
+ return 0;
+ }
+#endif
+ for (i=0; i < num; i++) {
+ if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
+ return 0;
+ }
+ return 1;
+}
+
+_INLINE_ void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
+ bitmap->description);
+ return;
+ }
+ for (i=0; i < num; i++)
+ ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
+ bitmap->description);
+ return;
+ }
+#endif
+ for (i=0; i < num; i++)
+ ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
+ bitmap->description);
+ return;
+ }
+ for (i=0; i < num; i++)
+ ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
+}
+
+_INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
+ blk_t block, int num)
+{
+ int i;
+
+#ifdef EXT2FS_DEBUG_FAST_OPS
+ if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
+ ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
+ bitmap->description);
+ return;
+ }
+#endif
+ for (i=0; i < num; i++)
+ ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
+}
+#undef _INLINE_
+#endif
+
generated by cgit v1.1 at 2024-12-29 19:34:32 +0000