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authorKent Overstreet <koverstreet@google.com>2013-03-23 16:11:31 -0700
committerKent Overstreet <koverstreet@google.com>2013-03-23 16:11:31 -0700
commitcafe563591446cf80bfbc2fe3bc72a2e36cf1060 (patch)
treec8ae27b13dcdb0219634376ca5e667df32b1173a /drivers/md/bcache/util.h
parentea6749c705d9e629ed03c7336cc929fc6014b834 (diff)
downloadop-kernel-dev-cafe563591446cf80bfbc2fe3bc72a2e36cf1060.zip
op-kernel-dev-cafe563591446cf80bfbc2fe3bc72a2e36cf1060.tar.gz
bcache: A block layer cache
Does writethrough and writeback caching, handles unclean shutdown, and has a bunch of other nifty features motivated by real world usage. See the wiki at http://bcache.evilpiepirate.org for more. Signed-off-by: Kent Overstreet <koverstreet@google.com>
Diffstat (limited to 'drivers/md/bcache/util.h')
-rw-r--r--drivers/md/bcache/util.h589
1 files changed, 589 insertions, 0 deletions
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
new file mode 100644
index 0000000..56705fd
--- /dev/null
+++ b/drivers/md/bcache/util.h
@@ -0,0 +1,589 @@
+
+#ifndef _BCACHE_UTIL_H
+#define _BCACHE_UTIL_H
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/llist.h>
+#include <linux/ratelimit.h>
+#include <linux/vmalloc.h>
+#include <linux/workqueue.h>
+
+#include "closure.h"
+
+#define PAGE_SECTORS (PAGE_SIZE / 512)
+
+struct closure;
+
+#include <trace/events/bcache.h>
+
+#ifdef CONFIG_BCACHE_EDEBUG
+
+#define atomic_dec_bug(v) BUG_ON(atomic_dec_return(v) < 0)
+#define atomic_inc_bug(v, i) BUG_ON(atomic_inc_return(v) <= i)
+
+#else /* EDEBUG */
+
+#define atomic_dec_bug(v) atomic_dec(v)
+#define atomic_inc_bug(v, i) atomic_inc(v)
+
+#endif
+
+#define BITMASK(name, type, field, offset, size) \
+static inline uint64_t name(const type *k) \
+{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \
+ \
+static inline void SET_##name(type *k, uint64_t v) \
+{ \
+ k->field &= ~(~((uint64_t) ~0 << size) << offset); \
+ k->field |= v << offset; \
+}
+
+#define DECLARE_HEAP(type, name) \
+ struct { \
+ size_t size, used; \
+ type *data; \
+ } name
+
+#define init_heap(heap, _size, gfp) \
+({ \
+ size_t _bytes; \
+ (heap)->used = 0; \
+ (heap)->size = (_size); \
+ _bytes = (heap)->size * sizeof(*(heap)->data); \
+ (heap)->data = NULL; \
+ if (_bytes < KMALLOC_MAX_SIZE) \
+ (heap)->data = kmalloc(_bytes, (gfp)); \
+ if ((!(heap)->data) && ((gfp) & GFP_KERNEL)) \
+ (heap)->data = vmalloc(_bytes); \
+ (heap)->data; \
+})
+
+#define free_heap(heap) \
+do { \
+ if (is_vmalloc_addr((heap)->data)) \
+ vfree((heap)->data); \
+ else \
+ kfree((heap)->data); \
+ (heap)->data = NULL; \
+} while (0)
+
+#define heap_swap(h, i, j) swap((h)->data[i], (h)->data[j])
+
+#define heap_sift(h, i, cmp) \
+do { \
+ size_t _r, _j = i; \
+ \
+ for (; _j * 2 + 1 < (h)->used; _j = _r) { \
+ _r = _j * 2 + 1; \
+ if (_r + 1 < (h)->used && \
+ cmp((h)->data[_r], (h)->data[_r + 1])) \
+ _r++; \
+ \
+ if (cmp((h)->data[_r], (h)->data[_j])) \
+ break; \
+ heap_swap(h, _r, _j); \
+ } \
+} while (0)
+
+#define heap_sift_down(h, i, cmp) \
+do { \
+ while (i) { \
+ size_t p = (i - 1) / 2; \
+ if (cmp((h)->data[i], (h)->data[p])) \
+ break; \
+ heap_swap(h, i, p); \
+ i = p; \
+ } \
+} while (0)
+
+#define heap_add(h, d, cmp) \
+({ \
+ bool _r = !heap_full(h); \
+ if (_r) { \
+ size_t _i = (h)->used++; \
+ (h)->data[_i] = d; \
+ \
+ heap_sift_down(h, _i, cmp); \
+ heap_sift(h, _i, cmp); \
+ } \
+ _r; \
+})
+
+#define heap_pop(h, d, cmp) \
+({ \
+ bool _r = (h)->used; \
+ if (_r) { \
+ (d) = (h)->data[0]; \
+ (h)->used--; \
+ heap_swap(h, 0, (h)->used); \
+ heap_sift(h, 0, cmp); \
+ } \
+ _r; \
+})
+
+#define heap_peek(h) ((h)->size ? (h)->data[0] : NULL)
+
+#define heap_full(h) ((h)->used == (h)->size)
+
+#define DECLARE_FIFO(type, name) \
+ struct { \
+ size_t front, back, size, mask; \
+ type *data; \
+ } name
+
+#define fifo_for_each(c, fifo, iter) \
+ for (iter = (fifo)->front; \
+ c = (fifo)->data[iter], iter != (fifo)->back; \
+ iter = (iter + 1) & (fifo)->mask)
+
+#define __init_fifo(fifo, gfp) \
+({ \
+ size_t _allocated_size, _bytes; \
+ BUG_ON(!(fifo)->size); \
+ \
+ _allocated_size = roundup_pow_of_two((fifo)->size + 1); \
+ _bytes = _allocated_size * sizeof(*(fifo)->data); \
+ \
+ (fifo)->mask = _allocated_size - 1; \
+ (fifo)->front = (fifo)->back = 0; \
+ (fifo)->data = NULL; \
+ \
+ if (_bytes < KMALLOC_MAX_SIZE) \
+ (fifo)->data = kmalloc(_bytes, (gfp)); \
+ if ((!(fifo)->data) && ((gfp) & GFP_KERNEL)) \
+ (fifo)->data = vmalloc(_bytes); \
+ (fifo)->data; \
+})
+
+#define init_fifo_exact(fifo, _size, gfp) \
+({ \
+ (fifo)->size = (_size); \
+ __init_fifo(fifo, gfp); \
+})
+
+#define init_fifo(fifo, _size, gfp) \
+({ \
+ (fifo)->size = (_size); \
+ if ((fifo)->size > 4) \
+ (fifo)->size = roundup_pow_of_two((fifo)->size) - 1; \
+ __init_fifo(fifo, gfp); \
+})
+
+#define free_fifo(fifo) \
+do { \
+ if (is_vmalloc_addr((fifo)->data)) \
+ vfree((fifo)->data); \
+ else \
+ kfree((fifo)->data); \
+ (fifo)->data = NULL; \
+} while (0)
+
+#define fifo_used(fifo) (((fifo)->back - (fifo)->front) & (fifo)->mask)
+#define fifo_free(fifo) ((fifo)->size - fifo_used(fifo))
+
+#define fifo_empty(fifo) (!fifo_used(fifo))
+#define fifo_full(fifo) (!fifo_free(fifo))
+
+#define fifo_front(fifo) ((fifo)->data[(fifo)->front])
+#define fifo_back(fifo) \
+ ((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
+
+#define fifo_idx(fifo, p) (((p) - &fifo_front(fifo)) & (fifo)->mask)
+
+#define fifo_push_back(fifo, i) \
+({ \
+ bool _r = !fifo_full((fifo)); \
+ if (_r) { \
+ (fifo)->data[(fifo)->back++] = (i); \
+ (fifo)->back &= (fifo)->mask; \
+ } \
+ _r; \
+})
+
+#define fifo_pop_front(fifo, i) \
+({ \
+ bool _r = !fifo_empty((fifo)); \
+ if (_r) { \
+ (i) = (fifo)->data[(fifo)->front++]; \
+ (fifo)->front &= (fifo)->mask; \
+ } \
+ _r; \
+})
+
+#define fifo_push_front(fifo, i) \
+({ \
+ bool _r = !fifo_full((fifo)); \
+ if (_r) { \
+ --(fifo)->front; \
+ (fifo)->front &= (fifo)->mask; \
+ (fifo)->data[(fifo)->front] = (i); \
+ } \
+ _r; \
+})
+
+#define fifo_pop_back(fifo, i) \
+({ \
+ bool _r = !fifo_empty((fifo)); \
+ if (_r) { \
+ --(fifo)->back; \
+ (fifo)->back &= (fifo)->mask; \
+ (i) = (fifo)->data[(fifo)->back] \
+ } \
+ _r; \
+})
+
+#define fifo_push(fifo, i) fifo_push_back(fifo, (i))
+#define fifo_pop(fifo, i) fifo_pop_front(fifo, (i))
+
+#define fifo_swap(l, r) \
+do { \
+ swap((l)->front, (r)->front); \
+ swap((l)->back, (r)->back); \
+ swap((l)->size, (r)->size); \
+ swap((l)->mask, (r)->mask); \
+ swap((l)->data, (r)->data); \
+} while (0)
+
+#define fifo_move(dest, src) \
+do { \
+ typeof(*((dest)->data)) _t; \
+ while (!fifo_full(dest) && \
+ fifo_pop(src, _t)) \
+ fifo_push(dest, _t); \
+} while (0)
+
+/*
+ * Simple array based allocator - preallocates a number of elements and you can
+ * never allocate more than that, also has no locking.
+ *
+ * Handy because if you know you only need a fixed number of elements you don't
+ * have to worry about memory allocation failure, and sometimes a mempool isn't
+ * what you want.
+ *
+ * We treat the free elements as entries in a singly linked list, and the
+ * freelist as a stack - allocating and freeing push and pop off the freelist.
+ */
+
+#define DECLARE_ARRAY_ALLOCATOR(type, name, size) \
+ struct { \
+ type *freelist; \
+ type data[size]; \
+ } name
+
+#define array_alloc(array) \
+({ \
+ typeof((array)->freelist) _ret = (array)->freelist; \
+ \
+ if (_ret) \
+ (array)->freelist = *((typeof((array)->freelist) *) _ret);\
+ \
+ _ret; \
+})
+
+#define array_free(array, ptr) \
+do { \
+ typeof((array)->freelist) _ptr = ptr; \
+ \
+ *((typeof((array)->freelist) *) _ptr) = (array)->freelist; \
+ (array)->freelist = _ptr; \
+} while (0)
+
+#define array_allocator_init(array) \
+do { \
+ typeof((array)->freelist) _i; \
+ \
+ BUILD_BUG_ON(sizeof((array)->data[0]) < sizeof(void *)); \
+ (array)->freelist = NULL; \
+ \
+ for (_i = (array)->data; \
+ _i < (array)->data + ARRAY_SIZE((array)->data); \
+ _i++) \
+ array_free(array, _i); \
+} while (0)
+
+#define array_freelist_empty(array) ((array)->freelist == NULL)
+
+#define ANYSINT_MAX(t) \
+ ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
+
+int strtoint_h(const char *, int *);
+int strtouint_h(const char *, unsigned int *);
+int strtoll_h(const char *, long long *);
+int strtoull_h(const char *, unsigned long long *);
+
+static inline int strtol_h(const char *cp, long *res)
+{
+#if BITS_PER_LONG == 32
+ return strtoint_h(cp, (int *) res);
+#else
+ return strtoll_h(cp, (long long *) res);
+#endif
+}
+
+static inline int strtoul_h(const char *cp, long *res)
+{
+#if BITS_PER_LONG == 32
+ return strtouint_h(cp, (unsigned int *) res);
+#else
+ return strtoull_h(cp, (unsigned long long *) res);
+#endif
+}
+
+#define strtoi_h(cp, res) \
+ (__builtin_types_compatible_p(typeof(*res), int) \
+ ? strtoint_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), long) \
+ ? strtol_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), long long) \
+ ? strtoll_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned int) \
+ ? strtouint_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned long) \
+ ? strtoul_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned long long)\
+ ? strtoull_h(cp, (void *) res) : -EINVAL)
+
+#define strtoul_safe(cp, var) \
+({ \
+ unsigned long _v; \
+ int _r = kstrtoul(cp, 10, &_v); \
+ if (!_r) \
+ var = _v; \
+ _r; \
+})
+
+#define strtoul_safe_clamp(cp, var, min, max) \
+({ \
+ unsigned long _v; \
+ int _r = kstrtoul(cp, 10, &_v); \
+ if (!_r) \
+ var = clamp_t(typeof(var), _v, min, max); \
+ _r; \
+})
+
+#define snprint(buf, size, var) \
+ snprintf(buf, size, \
+ __builtin_types_compatible_p(typeof(var), int) \
+ ? "%i\n" : \
+ __builtin_types_compatible_p(typeof(var), unsigned) \
+ ? "%u\n" : \
+ __builtin_types_compatible_p(typeof(var), long) \
+ ? "%li\n" : \
+ __builtin_types_compatible_p(typeof(var), unsigned long)\
+ ? "%lu\n" : \
+ __builtin_types_compatible_p(typeof(var), int64_t) \
+ ? "%lli\n" : \
+ __builtin_types_compatible_p(typeof(var), uint64_t) \
+ ? "%llu\n" : \
+ __builtin_types_compatible_p(typeof(var), const char *) \
+ ? "%s\n" : "%i\n", var)
+
+ssize_t hprint(char *buf, int64_t v);
+
+bool is_zero(const char *p, size_t n);
+int parse_uuid(const char *s, char *uuid);
+
+ssize_t snprint_string_list(char *buf, size_t size, const char * const list[],
+ size_t selected);
+
+ssize_t read_string_list(const char *buf, const char * const list[]);
+
+struct time_stats {
+ /*
+ * all fields are in nanoseconds, averages are ewmas stored left shifted
+ * by 8
+ */
+ uint64_t max_duration;
+ uint64_t average_duration;
+ uint64_t average_frequency;
+ uint64_t last;
+};
+
+void time_stats_update(struct time_stats *stats, uint64_t time);
+
+#define NSEC_PER_ns 1L
+#define NSEC_PER_us NSEC_PER_USEC
+#define NSEC_PER_ms NSEC_PER_MSEC
+#define NSEC_PER_sec NSEC_PER_SEC
+
+#define __print_time_stat(stats, name, stat, units) \
+ sysfs_print(name ## _ ## stat ## _ ## units, \
+ div_u64((stats)->stat >> 8, NSEC_PER_ ## units))
+
+#define sysfs_print_time_stats(stats, name, \
+ frequency_units, \
+ duration_units) \
+do { \
+ __print_time_stat(stats, name, \
+ average_frequency, frequency_units); \
+ __print_time_stat(stats, name, \
+ average_duration, duration_units); \
+ __print_time_stat(stats, name, \
+ max_duration, duration_units); \
+ \
+ sysfs_print(name ## _last_ ## frequency_units, (stats)->last \
+ ? div_s64(local_clock() - (stats)->last, \
+ NSEC_PER_ ## frequency_units) \
+ : -1LL); \
+} while (0)
+
+#define sysfs_time_stats_attribute(name, \
+ frequency_units, \
+ duration_units) \
+read_attribute(name ## _average_frequency_ ## frequency_units); \
+read_attribute(name ## _average_duration_ ## duration_units); \
+read_attribute(name ## _max_duration_ ## duration_units); \
+read_attribute(name ## _last_ ## frequency_units)
+
+#define sysfs_time_stats_attribute_list(name, \
+ frequency_units, \
+ duration_units) \
+&sysfs_ ## name ## _average_frequency_ ## frequency_units, \
+&sysfs_ ## name ## _average_duration_ ## duration_units, \
+&sysfs_ ## name ## _max_duration_ ## duration_units, \
+&sysfs_ ## name ## _last_ ## frequency_units,
+
+#define ewma_add(ewma, val, weight, factor) \
+({ \
+ (ewma) *= (weight) - 1; \
+ (ewma) += (val) << factor; \
+ (ewma) /= (weight); \
+ (ewma) >> factor; \
+})
+
+struct ratelimit {
+ uint64_t next;
+ unsigned rate;
+};
+
+static inline void ratelimit_reset(struct ratelimit *d)
+{
+ d->next = local_clock();
+}
+
+unsigned next_delay(struct ratelimit *d, uint64_t done);
+
+#define __DIV_SAFE(n, d, zero) \
+({ \
+ typeof(n) _n = (n); \
+ typeof(d) _d = (d); \
+ _d ? _n / _d : zero; \
+})
+
+#define DIV_SAFE(n, d) __DIV_SAFE(n, d, 0)
+
+#define container_of_or_null(ptr, type, member) \
+({ \
+ typeof(ptr) _ptr = ptr; \
+ _ptr ? container_of(_ptr, type, member) : NULL; \
+})
+
+#define RB_INSERT(root, new, member, cmp) \
+({ \
+ __label__ dup; \
+ struct rb_node **n = &(root)->rb_node, *parent = NULL; \
+ typeof(new) this; \
+ int res, ret = -1; \
+ \
+ while (*n) { \
+ parent = *n; \
+ this = container_of(*n, typeof(*(new)), member); \
+ res = cmp(new, this); \
+ if (!res) \
+ goto dup; \
+ n = res < 0 \
+ ? &(*n)->rb_left \
+ : &(*n)->rb_right; \
+ } \
+ \
+ rb_link_node(&(new)->member, parent, n); \
+ rb_insert_color(&(new)->member, root); \
+ ret = 0; \
+dup: \
+ ret; \
+})
+
+#define RB_SEARCH(root, search, member, cmp) \
+({ \
+ struct rb_node *n = (root)->rb_node; \
+ typeof(&(search)) this, ret = NULL; \
+ int res; \
+ \
+ while (n) { \
+ this = container_of(n, typeof(search), member); \
+ res = cmp(&(search), this); \
+ if (!res) { \
+ ret = this; \
+ break; \
+ } \
+ n = res < 0 \
+ ? n->rb_left \
+ : n->rb_right; \
+ } \
+ ret; \
+})
+
+#define RB_GREATER(root, search, member, cmp) \
+({ \
+ struct rb_node *n = (root)->rb_node; \
+ typeof(&(search)) this, ret = NULL; \
+ int res; \
+ \
+ while (n) { \
+ this = container_of(n, typeof(search), member); \
+ res = cmp(&(search), this); \
+ if (res < 0) { \
+ ret = this; \
+ n = n->rb_left; \
+ } else \
+ n = n->rb_right; \
+ } \
+ ret; \
+})
+
+#define RB_FIRST(root, type, member) \
+ container_of_or_null(rb_first(root), type, member)
+
+#define RB_LAST(root, type, member) \
+ container_of_or_null(rb_last(root), type, member)
+
+#define RB_NEXT(ptr, member) \
+ container_of_or_null(rb_next(&(ptr)->member), typeof(*ptr), member)
+
+#define RB_PREV(ptr, member) \
+ container_of_or_null(rb_prev(&(ptr)->member), typeof(*ptr), member)
+
+/* Does linear interpolation between powers of two */
+static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
+{
+ unsigned fract = x & ~(~0 << fract_bits);
+
+ x >>= fract_bits;
+ x = 1 << x;
+ x += (x * fract) >> fract_bits;
+
+ return x;
+}
+
+#define bio_end(bio) ((bio)->bi_sector + bio_sectors(bio))
+
+void bio_map(struct bio *bio, void *base);
+
+int bio_alloc_pages(struct bio *bio, gfp_t gfp);
+
+static inline sector_t bdev_sectors(struct block_device *bdev)
+{
+ return bdev->bd_inode->i_size >> 9;
+}
+
+#define closure_bio_submit(bio, cl, dev) \
+do { \
+ closure_get(cl); \
+ bch_generic_make_request(bio, &(dev)->bio_split_hook); \
+} while (0)
+
+uint64_t crc64_update(uint64_t, const void *, size_t);
+uint64_t crc64(const void *, size_t);
+
+#endif /* _BCACHE_UTIL_H */
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