Subversion Repositories HelenOS

Compare Revisions

Ignore whitespace Rev 4552 → Rev 4553

/trunk/uspace/lib/libblock/libblock.c
46,13 → 46,13
#include <ipc/ipc.h>
#include <as.h>
#include <assert.h>
#include <futex.h>
#include <fibril_sync.h>
#include <adt/list.h>
#include <adt/hash_table.h>
#include <mem.h>
 
/** Lock protecting the device connection list */
static futex_t dcl_lock = FUTEX_INITIALIZER;
static FIBRIL_MUTEX_INITIALIZE(dcl_lock);
/** Device connection list head. */
static LIST_INITIALIZE(dcl_head);
 
60,7 → 60,7
#define CACHE_BUCKETS (1 << CACHE_BUCKETS_LOG2)
 
typedef struct {
futex_t lock;
fibril_mutex_t lock;
size_t block_size; /**< Block size. */
unsigned block_count; /**< Total number of blocks. */
hash_table_t block_hash;
83,15 → 83,15
{
link_t *cur;
 
futex_down(&dcl_lock);
fibril_mutex_lock(&dcl_lock);
for (cur = dcl_head.next; cur != &dcl_head; cur = cur->next) {
devcon_t *devcon = list_get_instance(cur, devcon_t, link);
if (devcon->dev_handle == dev_handle) {
futex_up(&dcl_lock);
fibril_mutex_unlock(&dcl_lock);
return devcon;
}
}
futex_up(&dcl_lock);
fibril_mutex_unlock(&dcl_lock);
return NULL;
}
 
115,25 → 115,25
devcon->bb_size = 0;
devcon->cache = NULL;
 
futex_down(&dcl_lock);
fibril_mutex_lock(&dcl_lock);
for (cur = dcl_head.next; cur != &dcl_head; cur = cur->next) {
devcon_t *d = list_get_instance(cur, devcon_t, link);
if (d->dev_handle == dev_handle) {
futex_up(&dcl_lock);
fibril_mutex_unlock(&dcl_lock);
free(devcon);
return EEXIST;
}
}
list_append(&devcon->link, &dcl_head);
futex_up(&dcl_lock);
fibril_mutex_unlock(&dcl_lock);
return EOK;
}
 
static void devcon_remove(devcon_t *devcon)
{
futex_down(&dcl_lock);
fibril_mutex_lock(&dcl_lock);
list_remove(&devcon->link);
futex_up(&dcl_lock);
fibril_mutex_unlock(&dcl_lock);
}
 
int block_init(dev_handle_t dev_handle, size_t com_size)
262,7 → 262,7
if (!cache)
return ENOMEM;
futex_initialize(&cache->lock, 1);
fibril_mutex_initialize(&cache->lock);
list_initialize(&cache->free_head);
cache->block_size = size;
cache->block_count = blocks;
284,10 → 284,10
 
static void block_initialize(block_t *b)
{
futex_initialize(&b->lock, 1);
fibril_mutex_initialize(&b->lock);
b->refcnt = 1;
b->dirty = false;
rwlock_initialize(&b->contents_lock);
fibril_rwlock_initialize(&b->contents_lock);
link_initialize(&b->free_link);
link_initialize(&b->hash_link);
}
316,7 → 316,7
assert(devcon->cache);
cache = devcon->cache;
futex_down(&cache->lock);
fibril_mutex_lock(&cache->lock);
l = hash_table_find(&cache->block_hash, &key);
if (l) {
/*
323,11 → 323,11
* We found the block in the cache.
*/
b = hash_table_get_instance(l, block_t, hash_link);
futex_down(&b->lock);
fibril_mutex_lock(&b->lock);
if (b->refcnt++ == 0)
list_remove(&b->free_link);
futex_up(&b->lock);
futex_up(&cache->lock);
fibril_mutex_unlock(&b->lock);
fibril_mutex_unlock(&cache->lock);
} else {
/*
* The block was not found in the cache.
378,8 → 378,8
* kill concurent operations on the cache while doing I/O on the
* block.
*/
futex_down(&b->lock);
futex_up(&cache->lock);
fibril_mutex_lock(&b->lock);
fibril_mutex_unlock(&cache->lock);
 
if (sync) {
/*
393,14 → 393,12
* The block contains old or no data. We need to read
* the new contents from the device.
*/
async_serialize_start();
rc = block_read(dev_handle, &bufpos, &buflen, &pos,
b->data, cache->block_size, cache->block_size);
async_serialize_end();
assert(rc == EOK);
}
 
futex_up(&b->lock);
fibril_mutex_unlock(&b->lock);
}
return b;
}
420,8 → 418,8
assert(devcon->cache);
 
cache = devcon->cache;
futex_down(&cache->lock);
futex_down(&block->lock);
fibril_mutex_lock(&cache->lock);
fibril_mutex_lock(&block->lock);
if (!--block->refcnt) {
/*
* Last reference to the block was dropped, put the block on the
429,8 → 427,8
*/
list_append(&block->free_link, &cache->free_head);
}
futex_up(&block->lock);
futex_up(&cache->lock);
fibril_mutex_unlock(&block->lock);
fibril_mutex_unlock(&cache->lock);
}
 
/** Read data from a block device.
/trunk/uspace/lib/libblock/libblock.h
39,8 → 39,7
 
#include <stdint.h>
#include "../../srv/vfs/vfs.h"
#include <futex.h>
#include <rwlock.h>
#include <fibril_sync.h>
#include <adt/hash_table.h>
#include <adt/list.h>
 
63,14 → 62,14
typedef unsigned bn_t; /**< Block number type. */
 
typedef struct block {
/** Futex protecting the reference count. */
futex_t lock;
/** Mutex protecting the reference count. */
fibril_mutex_t lock;
/** Number of references to the block_t structure. */
unsigned refcnt;
/** If true, the block needs to be written back to the block device. */
bool dirty;
/** Readers / Writer lock protecting the contents of the block. */
rwlock_t contents_lock;
fibril_rwlock_t contents_lock;
/** Handle of the device where the block resides. */
dev_handle_t dev_handle;
/** Block offset on the block device. Counted in 'size'-byte blocks. */