Changeset f092718 in mainline

Timestamp:

2010-11-27T17:42:19Z (14 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

a6ba0c9

Parents:

45df59a

Message:

Small-to-large block size translation in block cache.

Location:

uspace

Files:

• lib/block/libblock.c (modified) (9 diffs)
• lib/block/libblock.h (modified) (1 diff)
• srv/fs/fat/fat_fat.c (modified) (5 diffs)

uspace/lib/block/libblock.c

@@ -66 +66 @@
         fibril_mutex_t lock;
         size_t lblock_size;             /**< Logical block size. */
+        unsigned blocks_cluster;        /**< Physical blocks per block_t */
         unsigned block_count;           /**< Total number of blocks. */
         unsigned blocks_cached;         /**< Number of cached blocks. */
@@ -90 +91 @@
 static int get_block_size(int dev_phone, size_t *bsize);
 static int get_num_blocks(int dev_phone, aoff64_t *nblocks);
+static aoff64_t ba_ltop(devcon_t *devcon, aoff64_t lba);
 
 static devcon_t *devcon_search(devmap_handle_t devmap_handle)
@@ -292 +294 @@
         cache->mode = mode;
 
-        /* No block size translation a.t.m. */
-        assert(cache->lblock_size == devcon->pblock_size);
+        /* Allow 1:1 or small-to-large block size translation */
+        if (cache->lblock_size % devcon->pblock_size != 0)
+                return ENOTSUP;
+
+        cache->blocks_cluster = cache->lblock_size / devcon->pblock_size;
 
         if (!hash_table_create(&cache->block_hash, CACHE_BUCKETS, 1,
@@ -329 +334 @@
                 if (b->dirty) {
                         memcpy(devcon->comm_area, b->data, b->size);
-                        rc = write_blocks(devcon, b->boff, 1);
+                        rc = write_blocks(devcon, b->pba, cache->blocks_cluster);
                         if (rc != EOK)
                                 return rc;
@@ -465 +470 @@
                                 fibril_mutex_lock(&devcon->comm_area_lock);
                                 memcpy(devcon->comm_area, b->data, b->size);
-                                rc = write_blocks(devcon, b->boff, 1);
+                                rc = write_blocks(devcon, b->pba,
+                                    cache->blocks_cluster);
                                 fibril_mutex_unlock(&devcon->comm_area_lock);
                                 if (rc != EOK) {
@@ -503 +509 @@
                 b->size = cache->lblock_size;
                 b->boff = boff;
+                b->pba = ba_ltop(devcon, b->boff);
                 hash_table_insert(&cache->block_hash, &key, &b->hash_link);
 
@@ -519 +526 @@
                          */
                         fibril_mutex_lock(&devcon->comm_area_lock);
-                        rc = read_blocks(devcon, b->boff, 1);
+                        rc = read_blocks(devcon, b->pba, cache->blocks_cluster);
                         memcpy(b->data, devcon->comm_area, cache->lblock_size);
                         fibril_mutex_unlock(&devcon->comm_area_lock);
@@ -580 +587 @@
                 fibril_mutex_lock(&devcon->comm_area_lock);
                 memcpy(devcon->comm_area, block->data, block->size);
-                rc = write_blocks(devcon, block->boff, 1);
+                rc = write_blocks(devcon, block->pba, cache->blocks_cluster);
                 fibril_mutex_unlock(&devcon->comm_area_lock);
                 block->dirty = false;
@@ -879 +886 @@
 }
 
+/** Convert logical block address to physical block address. */
+static aoff64_t ba_ltop(devcon_t *devcon, aoff64_t lba)
+{
+        assert(devcon->cache != NULL);
+        return lba * devcon->cache->blocks_cluster;
+}
+
 /** @}
  */

uspace/lib/block/libblock.h

@@ -73 +73 @@
         /** Handle of the device where the block resides. */
         devmap_handle_t devmap_handle;
-        /** Block offset on the block device. Counted in 'size'-byte blocks. */
+        /** Logical block address */
         aoff64_t boff;
+        /** Physical block address */
+        aoff64_t pba;
         /** Size of the block. */
         size_t size;

uspace/srv/fs/fat/fat_fat.c

@@ -671 +671 @@
         int rc;
 
+        printf("fat_sanity_check() begin\n");
+
         /* Check number of FATs. */
         if (bs->fatcnt == 0)
@@ -677 +679 @@
         /* Check total number of sectors. */
 
+        printf("fat_sanity_check() totsec\n");
+
         if (bs->totsec16 == 0 && bs->totsec32 == 0)
                 return ENOTSUP;
+
+        printf("fat_sanity_check() totsec16 vs 32\n");
 
         if (bs->totsec16 != 0 && bs->totsec32 != 0 &&
@@ -684 +690 @@
                 return ENOTSUP;
 
+        printf("fat_sanity_check() media descriptor\n");
+
         /* Check media descriptor. Must be between 0xf0 and 0xff. */
         if ((bs->mdesc & 0xf0) != 0xf0)
                 return ENOTSUP;
 
+        printf("fat_sanity_check() sec_pre_fat\n");
+
         /* Check number of sectors per FAT. */
         if (bs->sec_per_fat == 0)
                 return ENOTSUP;
+
+        printf("fat_sanity_check() root dir size\n");
 
         /*
@@ -705 +717 @@
         /* Check signature of each FAT. */
 
+        printf("fat_sanity_check() FAT signatures\n");
+
         for (fat_no = 0; fat_no < bs->fatcnt; fat_no++) {
+                printf("fat_sanity_check() read cluster 0\n");
                 rc = fat_get_cluster(bs, devmap_handle, fat_no, 0, &e0);
                 if (rc != EOK)
                         return EIO;
 
+                printf("fat_sanity_check() read cluster 1\n");
                 rc = fat_get_cluster(bs, devmap_handle, fat_no, 1, &e1);
                 if (rc != EOK)
                         return EIO;
 
+                printf("fat_sanity_check() check FAT mdesc\n");
                 /* Check that first byte of FAT contains the media descriptor. */
                 if ((e0 & 0xff) != bs->mdesc)
                         return ENOTSUP;
+
+                printf("fat_sanity_check() e0/e1\n");
 
                 /*
@@ -725 +744 @@
                         return ENOTSUP;
         }
+        printf("fat_sanity_check() succeeded\n");
 
         return EOK;