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Add option to set btree node size, give it sane default

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Change-Id: Ic6d0a79b8a33c8c17422e0875d9e8d3fb3ef6d98
This commit is contained in:
Kent Overstreet 2015-02-09 21:51:56 -08:00
parent 16d5881bad
commit 2859e5d780
3 changed files with 30 additions and 17 deletions
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24
bcache.c
View File

@ -581,24 +581,20 @@ int dev_open(const char *dev, bool wipe_bcache)
exit(EXIT_FAILURE);
}
static unsigned min_bucket_size(int num_bucket_sizes, unsigned *bucket_sizes)
{
int i;
unsigned min = bucket_sizes[0];
for (i = 0; i < num_bucket_sizes; i++)
min = bucket_sizes[i] < min ? bucket_sizes[i] : min;
return min;
}
void write_cache_sbs(int *fds, struct cache_sb *sb,
unsigned block_size, unsigned *bucket_sizes,
int num_bucket_sizes)
int num_bucket_sizes, unsigned btree_node_size)
{
char uuid_str[40], set_uuid_str[40];
size_t i;
unsigned min_size = min_bucket_size(num_bucket_sizes, bucket_sizes);
if (!btree_node_size) {
btree_node_size = 512;
for (i = 0; i < num_bucket_sizes; i++)
btree_node_size = min(btree_node_size,
bucket_sizes[i]);
}
sb->offset = SB_SECTOR;
sb->version = BCACHE_SB_VERSION_CDEV_V3;
@ -641,7 +637,7 @@ void write_cache_sbs(int *fds, struct cache_sb *sb,
for (i = 0; i < sb->nr_in_set; i++) {
struct cache_member *m = sb->members + i;
SET_CACHE_BTREE_NODE_SIZE(sb, min_size);
SET_CACHE_BTREE_NODE_SIZE(sb, btree_node_size);
sb->disk_uuid = m->uuid;

9
bcache.h
View File

@ -24,6 +24,12 @@ typedef __s64 s64;
#define MAX_PATH 256
#define MAX_DEVS MAX_CACHES_PER_SET
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
@ -67,7 +73,8 @@ unsigned hatoi_validate(const char *, const char *);
void write_backingdev_sb(int, unsigned, unsigned *, unsigned, uint64_t,
const char *, uuid_le, uuid_le);
int dev_open(const char *, bool);
void write_cache_sbs(int *, struct cache_sb *, unsigned, unsigned *, int);
void write_cache_sbs(int *, struct cache_sb *, unsigned,
unsigned *, int, unsigned);
void next_cache_device(struct cache_sb *, unsigned, int, unsigned, bool);
unsigned get_blocksize(const char *);
long strtoul_or_die(const char *, size_t, const char *);

14
bcacheadm.c
View File

@ -46,6 +46,7 @@ char *backing_devices[MAX_DEVS];
char *backing_dev_labels[MAX_DEVS];
size_t i, nr_backing_devices = 0, nr_cache_devices = 0;
unsigned block_size = 0;
unsigned btree_node_size = 0;
unsigned bucket_sizes[MAX_DEVS];
int num_bucket_sizes = 0;
int writeback = 0, writearound = 0, discard = 0, wipe_bcache = 0;
@ -109,6 +110,12 @@ static int set_block_size(NihOption *option, const char *arg)
return 0;
}
static int set_btree_node_size(NihOption *option, const char *arg)
{
btree_node_size = hatoi_validate(arg, "btree node size");
return 0;
}
static int set_cache(NihOption *option, const char *arg)
{
bdev = 0;
@ -191,7 +198,10 @@ static NihOption make_bcache_options[] = {
//Only one bucket_size supported until a list of bucket sizes is parsed correctly
{'b', "bucket", N_("bucket size"), NULL, "size", NULL, set_bucket_sizes},
//Does the default setter automatically convert strings to an int?
{'w', "block", N_("block size (hard sector size of SSD, often 2k"), NULL,"size", NULL, set_block_size},
{'w', "block", N_("block size (hard sector size of SSD, often 2k"), NULL, "size", NULL, set_block_size},
{'n', "btree-node", N_("Btree node size, default 256k"), NULL, "size", NULL, set_btree_node_size},
{'t', "tier", N_("tier of subsequent devices"), NULL,"#", &tier, NULL},
{'p', "cache_replacement_policy", N_("one of (lru|fifo|random)"), NULL,"policy", &replacement_policy, NULL},
{'o', "data_offset", N_("data offset in sectors"), NULL,"offset", &data_offset, NULL},
@ -386,7 +396,7 @@ int make_bcache(NihCommand *command, char *const *args)
backing_dev_fd[i] = dev_open(backing_devices[i], wipe_bcache);
write_cache_sbs(cache_dev_fd, cache_set_sb, block_size,
bucket_sizes, num_bucket_sizes);
bucket_sizes, num_bucket_sizes, btree_node_size);
if (writeback)
cache_mode = CACHE_MODE_WRITEBACK;