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minimum number of buckets now 1024

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This commit is contained in:
Kent Overstreet 2016-08-25 20:55:43 -08:00
parent cdd61de630
commit 97de91cb58
2 changed files with 41 additions and 12 deletions
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51
libbcache.c
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@ -17,6 +17,11 @@
#include "libbcache.h"
#include "crypto.h"
#define BCH_MIN_NR_NBUCKETS (1 << 10)
/* first bucket should start 1 mb in, in sectors: */
#define FIRST_BUCKET_OFFSET (1 << 11)
void __do_write_sb(int fd, void *sb, size_t bytes)
{
char zeroes[SB_SECTOR << 9] = {0};
@ -67,24 +72,46 @@ void bcache_format(struct dev_opts *devs, size_t nr_devs,
i->size = get_size(i->path, i->fd);
if (!i->bucket_size) {
u64 bytes = i->size << 9;
/*
* minimum size filesystem we can create, given a bucket
* size:
*/
u64 min_size(unsigned bucket_size) {
return (DIV_ROUND_UP(FIRST_BUCKET_OFFSET, bucket_size) +
BCH_MIN_NR_NBUCKETS) * bucket_size;
}
if (bytes < 1 << 20) /* 1M device - 256 4k buckets*/
i->bucket_size = rounddown_pow_of_two(bytes >> 17);
else
/* Max 1M bucket at around 256G */
i->bucket_size = 8 << min((ilog2(bytes >> 20) / 2), 9U);
if (i->size < min_size(block_size))
die("cannot format %s, too small (%llu sectors, min %llu)",
i->path, i->size, min_size(block_size));
/* Want a bucket size of at least 128k, if possible: */
i->bucket_size = max(block_size, 256U);
if (i->size >= min_size(i->bucket_size)) {
unsigned scale = max(1U,
ilog2(i->size / min_size(i->bucket_size)) / 4);
/* max bucket size 1 mb */
i->bucket_size = min(i->bucket_size * scale, 1U << 11);
} else {
do {
i->bucket_size /= 2;
} while (i->size < min_size(i->bucket_size));
}
}
/* first bucket: 1 mb in */
i->first_bucket = DIV_ROUND_UP(FIRST_BUCKET_OFFSET, i->bucket_size);
i->nbuckets = i->size / i->bucket_size;
if (i->bucket_size < block_size)
die("Bucket size cannot be smaller than block size");
i->nbuckets = i->size / i->bucket_size;
i->first_bucket = (23 / i->bucket_size) + 3;
if (i->nbuckets < 1 << 7)
die("Not enough buckets: %llu, need %u",
i->nbuckets, 1 << 7);
if (i->nbuckets - i->first_bucket < BCH_MIN_NR_NBUCKETS)
die("Not enough buckets: %llu, need %u (bucket size %u)",
i->nbuckets - i->first_bucket, BCH_MIN_NR_NBUCKETS,
i->bucket_size);
}
/* calculate btree node size: */

2
util.h
View File

@ -20,6 +20,8 @@ typedef __s16 s16;
typedef __s32 s32;
typedef __s64 s64;
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \