It's not really a bitmap, it's a bitmap of bitmaps. Now named.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
lib/num2str.c lib/ieee754.c $(wildcard crc/*.c) engines/cpu.c \
engines/mmap.c engines/sync.c engines/null.c engines/net.c \
memalign.c server.c client.c iolog.c backend.c libfio.c flow.c \
- json.c lib/zipf.c lib/bitmap.c lib/lfsr.c gettime-thread.c
+ json.c lib/zipf.c lib/axmap.c lib/lfsr.c gettime-thread.c
ifeq ($(UNAME), Linux)
SOURCE += diskutil.c fifo.c blktrace.c helpers.c cgroup.c trim.c \
#include "io_ddir.h"
#include "flist.h"
#include "lib/zipf.h"
-#include "lib/bitmap.h"
+#include "lib/axmap.h"
#include "lib/lfsr.h"
/*
/*
* block map for random io
*/
- struct bitmap *io_bitmap;
+ struct axmap *io_axmap;
struct fio_lfsr lfsr;
f->last_pos = f->file_offset;
f->last_start = -1ULL;
f->file_pos = -1ULL;
- if (f->io_bitmap)
- bitmap_reset(f->io_bitmap);
+ if (f->io_axmap)
+ axmap_reset(f->io_axmap);
}
#endif
#include "filehash.h"
#include "os/os.h"
#include "hash.h"
-#include "lib/bitmap.h"
+#include "lib/axmap.h"
#ifdef FIO_HAVE_LINUX_FALLOCATE
#include <linux/falloc.h>
if (!lfsr_init(&f->lfsr, blocks))
continue;
} else if (!td->o.norandommap) {
- f->io_bitmap = bitmap_new(blocks);
- if (f->io_bitmap)
+ f->io_axmap = axmap_new(blocks);
+ if (f->io_axmap)
continue;
}
sfree(f->file_name);
f->file_name = NULL;
- bitmap_free(f->io_bitmap);
- f->io_bitmap = NULL;
+ axmap_free(f->io_axmap);
+ f->io_axmap = NULL;
sfree(f);
}
#define td_trim(td) ((td)->o.td_ddir & TD_DDIR_TRIM)
#define td_rw(td) (((td)->o.td_ddir & TD_DDIR_RW) == TD_DDIR_RW)
#define td_random(td) ((td)->o.td_ddir & TD_DDIR_RAND)
-#define file_randommap(td, f) (!(td)->o.norandommap && (f)->io_bitmap)
+#define file_randommap(td, f) (!(td)->o.norandommap && (f)->io_axmap)
static inline int ddir_sync(enum fio_ddir ddir)
{
#include "verify.h"
#include "trim.h"
#include "lib/rand.h"
-#include "lib/bitmap.h"
+#include "lib/axmap.h"
struct io_completion_data {
int nr; /* input */
};
/*
- * The ->io_bitmap contains a map of blocks we have or have not done io
+ * The ->io_axmap contains a map of blocks we have or have not done io
* to yet. Used to make sure we cover the entire range in a fair fashion.
*/
static int random_map_free(struct fio_file *f, const unsigned long long block)
{
- return !bitmap_isset(f->io_bitmap, block);
+ return !axmap_isset(f->io_axmap, block);
}
/*
nr_blocks = (io_u->buflen + min_bs - 1) / min_bs;
if (!(io_u->flags & IO_U_F_BUSY_OK))
- nr_blocks = bitmap_set_nr(f->io_bitmap, block, nr_blocks);
+ nr_blocks = axmap_set_nr(f->io_axmap, block, nr_blocks);
if ((nr_blocks * min_bs) < io_u->buflen)
io_u->buflen = nr_blocks * min_bs;
dprint(FD_RANDOM, "get_next_rand_offset: offset %llu busy\n", *b);
- *b = bitmap_next_free(f->io_bitmap, *b);
+ *b = axmap_next_free(f->io_axmap, *b);
if (*b == (uint64_t) -1ULL)
return 1;
ret:
--- /dev/null
+/*
+ * Bitmap of bitmaps, where each layer is number-of-bits-per-word smaller than
+ * the previous. Hence an 'axmap', since we axe each previous layer into a
+ * much smaller piece. I swear, that is why it's named like that. It has
+ * nothing to do with anything remotely narcissistic.
+ *
+ * A set bit at layer N indicates a full word at layer N-1, and so forth. As
+ * the bitmap becomes progressively more full, checking for existance
+ * becomes cheaper (since fewer layers are walked, making it a lot more
+ * cache friendly) and locating the next free space likewise.
+ *
+ * Axmaps get pretty close to optimal (1 bit per block) space usage, since
+ * layers quickly diminish in size. Doing the size math is straight forward,
+ * since we have log64(blocks) layers of maps. For 20000 blocks, overhead
+ * is roughly 1.9%, or 1.019 bits per block. The number quickly converges
+ * towards 1.0158, or 1.58% of overhead.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "../arch/arch.h"
+#include "axmap.h"
+#include "../smalloc.h"
+#include "../minmax.h"
+
+#if BITS_PER_LONG == 64
+#define UNIT_SHIFT 6
+#elif BITS_PER_LONG == 32
+#define UNIT_SHIFT 5
+#else
+#error "Number of arch bits unknown"
+#endif
+
+#define BLOCKS_PER_UNIT (1UL << UNIT_SHIFT)
+#define BLOCKS_PER_UNIT_MASK (BLOCKS_PER_UNIT - 1)
+
+#define firstfree_valid(b) ((b)->first_free != (uint64_t) -1)
+
+struct axmap_level {
+ int level;
+ unsigned long map_size;
+ unsigned long *map;
+};
+
+struct axmap {
+ unsigned int nr_levels;
+ struct axmap_level *levels;
+ uint64_t first_free;
+};
+
+static unsigned long ulog64(unsigned long val, unsigned int log)
+{
+ while (log-- && val)
+ val >>= UNIT_SHIFT;
+
+ return val;
+}
+
+void axmap_reset(struct axmap *axmap)
+{
+ int i;
+
+ for (i = 0; i < axmap->nr_levels; i++) {
+ struct axmap_level *al = &axmap->levels[i];
+
+ memset(al->map, 0, al->map_size * sizeof(unsigned long));
+ }
+}
+
+void axmap_free(struct axmap *axmap)
+{
+ unsigned int i;
+
+ if (!axmap)
+ return;
+
+ for (i = 0; i < axmap->nr_levels; i++)
+ sfree(axmap->levels[i].map);
+
+ sfree(axmap->levels);
+ sfree(axmap);
+}
+
+struct axmap *axmap_new(unsigned long nr_bits)
+{
+ struct axmap *axmap;
+ unsigned int i, levels;
+
+ axmap = smalloc(sizeof(*axmap));
+ if (!axmap)
+ return NULL;
+
+ levels = 1;
+ i = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
+ while (i > 1) {
+ i = (i + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
+ levels++;
+ }
+
+ axmap->nr_levels = levels;
+ axmap->levels = smalloc(axmap->nr_levels * sizeof(struct axmap_level));
+ axmap->first_free = 0;
+
+ for (i = 0; i < axmap->nr_levels; i++) {
+ struct axmap_level *al = &axmap->levels[i];
+
+ al->level = i;
+ al->map_size = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
+ al->map = smalloc(al->map_size * sizeof(unsigned long));
+ if (!al->map)
+ goto err;
+
+ nr_bits = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
+ }
+
+ axmap_reset(axmap);
+ return axmap;
+err:
+ for (i = 0; i < axmap->nr_levels; i++)
+ if (axmap->levels[i].map)
+ sfree(axmap->levels[i].map);
+
+ sfree(axmap->levels);
+ return NULL;
+}
+
+static int axmap_handler(struct axmap *axmap, uint64_t bit_nr,
+ int (*func)(struct axmap_level *, unsigned long, unsigned int,
+ void *), void *data)
+{
+ struct axmap_level *al;
+ int i;
+
+ for (i = 0; i < axmap->nr_levels; i++) {
+ unsigned long index = ulog64(bit_nr, i);
+ unsigned long offset = index >> UNIT_SHIFT;
+ unsigned int bit = index & BLOCKS_PER_UNIT_MASK;
+
+ al = &axmap->levels[i];
+
+ if (func(al, offset, bit, data))
+ return 1;
+ }
+
+ return 0;
+}
+
+static int axmap_handler_topdown(struct axmap *axmap, uint64_t bit_nr,
+ int (*func)(struct axmap_level *, unsigned long, unsigned int, void *),
+ void *data)
+{
+ struct axmap_level *al;
+ int i, level = axmap->nr_levels;
+
+ for (i = axmap->nr_levels - 1; i >= 0; i--) {
+ unsigned long index = ulog64(bit_nr, --level);
+ unsigned long offset = index >> UNIT_SHIFT;
+ unsigned int bit = index & BLOCKS_PER_UNIT_MASK;
+
+ al = &axmap->levels[i];
+
+ if (func(al, offset, bit, data))
+ return 1;
+ }
+
+ return 0;
+}
+
+static int axmap_clear_fn(struct axmap_level *al, unsigned long offset,
+ unsigned int bit, void *unused)
+{
+ if (!(al->map[offset] & (1UL << bit)))
+ return 1;
+
+ al->map[offset] &= ~(1UL << bit);
+ return 0;
+}
+
+void axmap_clear(struct axmap *axmap, uint64_t bit_nr)
+{
+ axmap_handler(axmap, bit_nr, axmap_clear_fn, NULL);
+}
+
+struct axmap_set_data {
+ unsigned int nr_bits;
+ unsigned int set_bits;
+ unsigned int fail_ok;
+};
+
+static unsigned long bit_masks[] = {
+ 0x0000000000000000, 0x0000000000000001, 0x0000000000000003, 0x0000000000000007,
+ 0x000000000000000f, 0x000000000000001f, 0x000000000000003f, 0x000000000000007f,
+ 0x00000000000000ff, 0x00000000000001ff, 0x00000000000003ff, 0x00000000000007ff,
+ 0x0000000000000fff, 0x0000000000001fff, 0x0000000000003fff, 0x0000000000007fff,
+ 0x000000000000ffff, 0x000000000001ffff, 0x000000000003ffff, 0x000000000007ffff,
+ 0x00000000000fffff, 0x00000000001fffff, 0x00000000003fffff, 0x00000000007fffff,
+ 0x0000000000ffffff, 0x0000000001ffffff, 0x0000000003ffffff, 0x0000000007ffffff,
+ 0x000000000fffffff, 0x000000001fffffff, 0x000000003fffffff, 0x000000007fffffff,
+ 0x00000000ffffffff,
+#if BITS_PER_LONG == 64
+ 0x00000001ffffffff, 0x00000003ffffffff, 0x00000007ffffffff, 0x0000000fffffffff,
+ 0x0000001fffffffff, 0x0000003fffffffff, 0x0000007fffffffff, 0x000000ffffffffff,
+ 0x000001ffffffffff, 0x000003ffffffffff, 0x000007ffffffffff, 0x00000fffffffffff,
+ 0x00001fffffffffff, 0x00003fffffffffff, 0x00007fffffffffff, 0x0000ffffffffffff,
+ 0x0001ffffffffffff, 0x0003ffffffffffff, 0x0007ffffffffffff, 0x000fffffffffffff,
+ 0x001fffffffffffff, 0x003fffffffffffff, 0x007fffffffffffff, 0x00ffffffffffffff,
+ 0x01ffffffffffffff, 0x03ffffffffffffff, 0x07ffffffffffffff, 0x0fffffffffffffff,
+ 0x1fffffffffffffff, 0x3fffffffffffffff, 0x7fffffffffffffff, 0xffffffffffffffff
+#endif
+};
+
+static int axmap_set_fn(struct axmap_level *al, unsigned long offset,
+ unsigned int bit, void *__data)
+{
+ struct axmap_set_data *data = __data;
+ unsigned long mask, overlap;
+ unsigned int nr_bits;
+
+ nr_bits = min(data->nr_bits, BLOCKS_PER_UNIT - bit);
+
+ mask = bit_masks[nr_bits] << bit;
+
+ /*
+ * Mask off any potential overlap, only sets contig regions
+ */
+ overlap = al->map[offset] & mask;
+ if (overlap == mask) {
+ assert(data->fail_ok);
+ return 1;
+ }
+
+ while (overlap) {
+ unsigned long clear_mask = ~(1UL << ffz(~overlap));
+
+ mask &= clear_mask;
+ overlap &= clear_mask;
+ nr_bits--;
+ }
+
+ assert(mask);
+ assert(!(al->map[offset] & mask));
+
+ al->map[offset] |= mask;
+
+ if (!al->level)
+ data->set_bits = nr_bits;
+
+ data->nr_bits = 1;
+ return al->map[offset] != -1UL;
+}
+
+static void __axmap_set(struct axmap *axmap, uint64_t bit_nr,
+ struct axmap_set_data *data)
+{
+ unsigned int set_bits, nr_bits = data->nr_bits;
+
+ if (axmap->first_free >= bit_nr &&
+ axmap->first_free < bit_nr + data->nr_bits)
+ axmap->first_free = -1ULL;
+
+ set_bits = 0;
+ while (nr_bits) {
+ axmap_handler(axmap, bit_nr, axmap_set_fn, data);
+ set_bits += data->set_bits;
+
+ if (data->set_bits != (BLOCKS_PER_UNIT - nr_bits))
+ break;
+
+ nr_bits -= data->set_bits;
+ bit_nr += data->set_bits;
+
+ data->nr_bits = nr_bits;
+ data->fail_ok = 1;
+ }
+
+ data->set_bits = set_bits;
+}
+
+void axmap_set(struct axmap *axmap, uint64_t bit_nr)
+{
+ struct axmap_set_data data = { .nr_bits = 1, };
+
+ __axmap_set(axmap, bit_nr, &data);
+}
+
+unsigned int axmap_set_nr(struct axmap *axmap, uint64_t bit_nr, unsigned int nr_bits)
+{
+ struct axmap_set_data data = { .nr_bits = nr_bits, };
+
+ __axmap_set(axmap, bit_nr, &data);
+ return data.set_bits;
+}
+
+static int axmap_isset_fn(struct axmap_level *al, unsigned long offset,
+ unsigned int bit, void *unused)
+{
+ return (al->map[offset] & (1UL << bit)) != 0;
+}
+
+int axmap_isset(struct axmap *axmap, uint64_t bit_nr)
+{
+ return axmap_handler_topdown(axmap, bit_nr, axmap_isset_fn, NULL);
+}
+
+static uint64_t axmap_find_first_free(struct axmap *axmap, unsigned int level,
+ uint64_t index)
+{
+ unsigned long j;
+ int i;
+
+ /*
+ * Start at the bottom, then converge towards first free bit at the top
+ */
+ for (i = level; i >= 0; i--) {
+ struct axmap_level *al = &axmap->levels[i];
+
+ if (index >= al->map_size) {
+ index = -1ULL;
+ break;
+ }
+
+ for (j = index; j < al->map_size; j++) {
+ if (al->map[j] == -1UL)
+ continue;
+
+ /*
+ * First free bit here is our index into the first
+ * free bit at the next higher level
+ */
+ index = (j << UNIT_SHIFT) + ffz(al->map[j]);
+ break;
+ }
+ }
+
+ return index;
+}
+
+uint64_t axmap_first_free(struct axmap *axmap)
+{
+ if (firstfree_valid(axmap))
+ return axmap->first_free;
+
+ axmap->first_free = axmap_find_first_free(axmap, axmap->nr_levels - 1, 0);
+ return axmap->first_free;
+}
+
+struct axmap_next_free_data {
+ unsigned int level;
+ unsigned long offset;
+ uint64_t bit;
+};
+
+static int axmap_next_free_fn(struct axmap_level *al, unsigned long offset,
+ unsigned int bit, void *__data)
+{
+ struct axmap_next_free_data *data = __data;
+ uint64_t mask = ~((1UL << ((data->bit & BLOCKS_PER_UNIT_MASK) + 1)) - 1);
+
+ if (!(mask & al->map[offset]))
+ return 0;
+
+ if (al->map[offset] != -1UL) {
+ data->level = al->level;
+ data->offset = offset;
+ return 1;
+ }
+
+ data->bit = (data->bit + BLOCKS_PER_UNIT - 1) / BLOCKS_PER_UNIT;
+ return 0;
+}
+
+/*
+ * 'bit_nr' is already set. Find the next free bit after this one.
+ */
+uint64_t axmap_next_free(struct axmap *axmap, uint64_t bit_nr)
+{
+ struct axmap_next_free_data data = { .level = -1U, .bit = bit_nr, };
+
+ if (firstfree_valid(axmap) && bit_nr < axmap->first_free)
+ return axmap->first_free;
+
+ if (!axmap_handler(axmap, bit_nr, axmap_next_free_fn, &data))
+ return axmap_first_free(axmap);
+
+ assert(data.level != -1U);
+
+ return axmap_find_first_free(axmap, data.level, data.offset);
+}
--- /dev/null
+#ifndef FIO_BITMAP_H
+#define FIO_BITMAP_H
+
+#include <inttypes.h>
+
+struct axmap;
+struct axmap *axmap_new(unsigned long nr_bits);
+void axmap_free(struct axmap *bm);
+
+void axmap_clear(struct axmap *axmap, uint64_t bit_nr);
+void axmap_set(struct axmap *axmap, uint64_t bit_nr);
+unsigned int axmap_set_nr(struct axmap *axmap, uint64_t bit_nr, unsigned int nr_bits);
+int axmap_isset(struct axmap *axmap, uint64_t bit_nr);
+uint64_t axmap_first_free(struct axmap *axmap);
+uint64_t axmap_next_free(struct axmap *axmap, uint64_t bit_nr);
+void axmap_reset(struct axmap *axmap);
+
+#endif
+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-
-#include "../arch/arch.h"
-#include "bitmap.h"
-#include "../smalloc.h"
-#include "../minmax.h"
-
-#if BITS_PER_LONG == 64
-#define UNIT_SHIFT 6
-#elif BITS_PER_LONG == 32
-#define UNIT_SHIFT 5
-#else
-#error "Number of arch bits unknown"
-#endif
-
-#define BLOCKS_PER_UNIT (1UL << UNIT_SHIFT)
-#define BLOCKS_PER_UNIT_MASK (BLOCKS_PER_UNIT - 1)
-
-#define firstfree_valid(b) ((b)->first_free != (uint64_t) -1)
-
-struct bitmap_level {
- int level;
- unsigned long map_size;
- unsigned long *map;
-};
-
-struct bitmap {
- unsigned int nr_levels;
- struct bitmap_level *levels;
- uint64_t first_free;
-};
-
-static unsigned long ulog64(unsigned long val, unsigned int log)
-{
- while (log-- && val)
- val >>= UNIT_SHIFT;
-
- return val;
-}
-
-void bitmap_reset(struct bitmap *bitmap)
-{
- int i;
-
- for (i = 0; i < bitmap->nr_levels; i++) {
- struct bitmap_level *bl = &bitmap->levels[i];
-
- memset(bl->map, 0, bl->map_size * sizeof(unsigned long));
- }
-}
-
-void bitmap_free(struct bitmap *bitmap)
-{
- unsigned int i;
-
- if (!bitmap)
- return;
-
- for (i = 0; i < bitmap->nr_levels; i++)
- sfree(bitmap->levels[i].map);
-
- sfree(bitmap->levels);
- sfree(bitmap);
-}
-
-struct bitmap *bitmap_new(unsigned long nr_bits)
-{
- struct bitmap *bitmap;
- unsigned int i, levels;
-
- bitmap = smalloc(sizeof(*bitmap));
- if (!bitmap)
- return NULL;
-
- levels = 1;
- i = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
- while (i > 1) {
- i = (i + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
- levels++;
- }
-
- bitmap->nr_levels = levels;
- bitmap->levels = smalloc(bitmap->nr_levels * sizeof(struct bitmap_level));
- bitmap->first_free = 0;
-
- for (i = 0; i < bitmap->nr_levels; i++) {
- struct bitmap_level *bl = &bitmap->levels[i];
-
- bl->level = i;
- bl->map_size = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
- bl->map = smalloc(bl->map_size * sizeof(unsigned long));
- if (!bl->map)
- goto err;
-
- nr_bits = (nr_bits + BLOCKS_PER_UNIT - 1) >> UNIT_SHIFT;
- }
-
- bitmap_reset(bitmap);
- return bitmap;
-err:
- for (i = 0; i < bitmap->nr_levels; i++)
- if (bitmap->levels[i].map)
- sfree(bitmap->levels[i].map);
-
- sfree(bitmap->levels);
- return NULL;
-}
-
-static int bitmap_handler(struct bitmap *bitmap, uint64_t bit_nr,
- int (*func)(struct bitmap_level *, unsigned long, unsigned int,
- void *), void *data)
-{
- struct bitmap_level *bl;
- int i;
-
- for (i = 0; i < bitmap->nr_levels; i++) {
- unsigned long index = ulog64(bit_nr, i);
- unsigned long offset = index >> UNIT_SHIFT;
- unsigned int bit = index & BLOCKS_PER_UNIT_MASK;
-
- bl = &bitmap->levels[i];
-
- if (func(bl, offset, bit, data))
- return 1;
- }
-
- return 0;
-}
-
-static int bitmap_handler_topdown(struct bitmap *bitmap, uint64_t bit_nr,
- int (*func)(struct bitmap_level *, unsigned long, unsigned int, void *),
- void *data)
-{
- struct bitmap_level *bl;
- int i, level = bitmap->nr_levels;
-
- for (i = bitmap->nr_levels - 1; i >= 0; i--) {
- unsigned long index = ulog64(bit_nr, --level);
- unsigned long offset = index >> UNIT_SHIFT;
- unsigned int bit = index & BLOCKS_PER_UNIT_MASK;
-
- bl = &bitmap->levels[i];
-
- if (func(bl, offset, bit, data))
- return 1;
- }
-
- return 0;
-}
-
-static int bitmap_clear_fn(struct bitmap_level *bl, unsigned long offset,
- unsigned int bit, void *unused)
-{
- if (!(bl->map[offset] & (1UL << bit)))
- return 1;
-
- bl->map[offset] &= ~(1UL << bit);
- return 0;
-}
-
-void bitmap_clear(struct bitmap *bitmap, uint64_t bit_nr)
-{
- bitmap_handler(bitmap, bit_nr, bitmap_clear_fn, NULL);
-}
-
-struct bitmap_set_data {
- unsigned int nr_bits;
- unsigned int set_bits;
- unsigned int fail_ok;
-};
-
-static unsigned long bit_masks[] = {
- 0x0000000000000000, 0x0000000000000001, 0x0000000000000003, 0x0000000000000007,
- 0x000000000000000f, 0x000000000000001f, 0x000000000000003f, 0x000000000000007f,
- 0x00000000000000ff, 0x00000000000001ff, 0x00000000000003ff, 0x00000000000007ff,
- 0x0000000000000fff, 0x0000000000001fff, 0x0000000000003fff, 0x0000000000007fff,
- 0x000000000000ffff, 0x000000000001ffff, 0x000000000003ffff, 0x000000000007ffff,
- 0x00000000000fffff, 0x00000000001fffff, 0x00000000003fffff, 0x00000000007fffff,
- 0x0000000000ffffff, 0x0000000001ffffff, 0x0000000003ffffff, 0x0000000007ffffff,
- 0x000000000fffffff, 0x000000001fffffff, 0x000000003fffffff, 0x000000007fffffff,
- 0x00000000ffffffff,
-#if BITS_PER_LONG == 64
- 0x00000001ffffffff, 0x00000003ffffffff, 0x00000007ffffffff, 0x0000000fffffffff,
- 0x0000001fffffffff, 0x0000003fffffffff, 0x0000007fffffffff, 0x000000ffffffffff,
- 0x000001ffffffffff, 0x000003ffffffffff, 0x000007ffffffffff, 0x00000fffffffffff,
- 0x00001fffffffffff, 0x00003fffffffffff, 0x00007fffffffffff, 0x0000ffffffffffff,
- 0x0001ffffffffffff, 0x0003ffffffffffff, 0x0007ffffffffffff, 0x000fffffffffffff,
- 0x001fffffffffffff, 0x003fffffffffffff, 0x007fffffffffffff, 0x00ffffffffffffff,
- 0x01ffffffffffffff, 0x03ffffffffffffff, 0x07ffffffffffffff, 0x0fffffffffffffff,
- 0x1fffffffffffffff, 0x3fffffffffffffff, 0x7fffffffffffffff, 0xffffffffffffffff
-#endif
-};
-
-static int bitmap_set_fn(struct bitmap_level *bl, unsigned long offset,
- unsigned int bit, void *__data)
-{
- struct bitmap_set_data *data = __data;
- unsigned long mask, overlap;
- unsigned int nr_bits;
-
- nr_bits = min(data->nr_bits, BLOCKS_PER_UNIT - bit);
-
- mask = bit_masks[nr_bits] << bit;
-
- /*
- * Mask off any potential overlap, only sets contig regions
- */
- overlap = bl->map[offset] & mask;
- if (overlap == mask) {
- assert(data->fail_ok);
- return 1;
- }
-
- while (overlap) {
- unsigned long clear_mask = ~(1UL << ffz(~overlap));
-
- mask &= clear_mask;
- overlap &= clear_mask;
- nr_bits--;
- }
-
- assert(mask);
- assert(!(bl->map[offset] & mask));
-
- bl->map[offset] |= mask;
-
- if (!bl->level)
- data->set_bits = nr_bits;
-
- data->nr_bits = 1;
- return bl->map[offset] != -1UL;
-}
-
-static void __bitmap_set(struct bitmap *bitmap, uint64_t bit_nr,
- struct bitmap_set_data *data)
-{
- unsigned int set_bits, nr_bits = data->nr_bits;
-
- if (bitmap->first_free >= bit_nr &&
- bitmap->first_free < bit_nr + data->nr_bits)
- bitmap->first_free = -1ULL;
-
- set_bits = 0;
- while (nr_bits) {
- bitmap_handler(bitmap, bit_nr, bitmap_set_fn, data);
- set_bits += data->set_bits;
-
- if (data->set_bits != (BLOCKS_PER_UNIT - nr_bits))
- break;
-
- nr_bits -= data->set_bits;
- bit_nr += data->set_bits;
-
- data->nr_bits = nr_bits;
- data->fail_ok = 1;
- }
-
- data->set_bits = set_bits;
-}
-
-void bitmap_set(struct bitmap *bitmap, uint64_t bit_nr)
-{
- struct bitmap_set_data data = { .nr_bits = 1, };
-
- __bitmap_set(bitmap, bit_nr, &data);
-}
-
-unsigned int bitmap_set_nr(struct bitmap *bitmap, uint64_t bit_nr, unsigned int nr_bits)
-{
- struct bitmap_set_data data = { .nr_bits = nr_bits, };
-
- __bitmap_set(bitmap, bit_nr, &data);
- return data.set_bits;
-}
-
-static int bitmap_isset_fn(struct bitmap_level *bl, unsigned long offset,
- unsigned int bit, void *unused)
-{
- return (bl->map[offset] & (1UL << bit)) != 0;
-}
-
-int bitmap_isset(struct bitmap *bitmap, uint64_t bit_nr)
-{
- return bitmap_handler_topdown(bitmap, bit_nr, bitmap_isset_fn, NULL);
-}
-
-static uint64_t bitmap_find_first_free(struct bitmap *bitmap, unsigned int level,
- uint64_t index)
-{
- unsigned long j;
- int i;
-
- /*
- * Start at the bottom, then converge towards first free bit at the top
- */
- for (i = level; i >= 0; i--) {
- struct bitmap_level *bl = &bitmap->levels[i];
-
- if (index >= bl->map_size) {
- index = -1ULL;
- break;
- }
-
- for (j = index; j < bl->map_size; j++) {
- if (bl->map[j] == -1UL)
- continue;
-
- /*
- * First free bit here is our index into the first
- * free bit at the next higher level
- */
- index = (j << UNIT_SHIFT) + ffz(bl->map[j]);
- break;
- }
- }
-
- return index;
-}
-
-uint64_t bitmap_first_free(struct bitmap *bitmap)
-{
- if (firstfree_valid(bitmap))
- return bitmap->first_free;
-
- bitmap->first_free = bitmap_find_first_free(bitmap, bitmap->nr_levels - 1, 0);
- return bitmap->first_free;
-}
-
-struct bitmap_next_free_data {
- unsigned int level;
- unsigned long offset;
- uint64_t bit;
-};
-
-static int bitmap_next_free_fn(struct bitmap_level *bl, unsigned long offset,
- unsigned int bit, void *__data)
-{
- struct bitmap_next_free_data *data = __data;
- uint64_t mask = ~((1UL << ((data->bit & BLOCKS_PER_UNIT_MASK) + 1)) - 1);
-
- if (!(mask & bl->map[offset]))
- return 0;
-
- if (bl->map[offset] != -1UL) {
- data->level = bl->level;
- data->offset = offset;
- return 1;
- }
-
- data->bit = (data->bit + BLOCKS_PER_UNIT - 1) / BLOCKS_PER_UNIT;
- return 0;
-}
-
-/*
- * 'bit_nr' is already set. Find the next free bit after this one.
- */
-uint64_t bitmap_next_free(struct bitmap *bitmap, uint64_t bit_nr)
-{
- struct bitmap_next_free_data data = { .level = -1U, .bit = bit_nr, };
-
- if (firstfree_valid(bitmap) && bit_nr < bitmap->first_free)
- return bitmap->first_free;
-
- if (!bitmap_handler(bitmap, bit_nr, bitmap_next_free_fn, &data))
- return bitmap_first_free(bitmap);
-
- assert(data.level != -1U);
-
- return bitmap_find_first_free(bitmap, data.level, data.offset);
-}
+++ /dev/null
-#ifndef FIO_BITMAP_H
-#define FIO_BITMAP_H
-
-#include <inttypes.h>
-
-struct bitmap;
-struct bitmap *bitmap_new(unsigned long nr_bits);
-void bitmap_free(struct bitmap *bm);
-
-void bitmap_clear(struct bitmap *bitmap, uint64_t bit_nr);
-void bitmap_set(struct bitmap *bitmap, uint64_t bit_nr);
-unsigned int bitmap_set_nr(struct bitmap *bitmap, uint64_t bit_nr, unsigned int nr_bits);
-int bitmap_isset(struct bitmap *bitmap, uint64_t bit_nr);
-uint64_t bitmap_first_free(struct bitmap *bitmap);
-uint64_t bitmap_next_free(struct bitmap *bitmap, uint64_t bit_nr);
-void bitmap_reset(struct bitmap *bitmap);
-
-#endif
projects / fio.git / commitdiff