Changeset 6da81e0 in mainline for uspace/srv/fs/fat/fat_fat.c

Timestamp:

2010-07-28T10:12:43Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

dba4a23

Parents:

7a23d60

Message:

Modify _fat_block_get() to return the "current" cluster number to the caller.

File:

• uspace/srv/fs/fat/fat_fat.c (modified) (7 diffs)

uspace/srv/fs/fat/fat_fat.c

@@ -160 +160 @@
 fall_through:
         return _fat_block_get(block, bs, nodep->idx->dev_handle, nodep->firstc,
-            bn, flags);
+            NULL, bn, flags);
 }
 
@@ -168 +168 @@
  * @param bs            Buffer holding the boot sector of the file system.
  * @param dev_handle    Device handle of the file system.
- * @param firstc        First cluster used by the file. Can be zero if the file
+ * @param fcl           First cluster used by the file. Can be zero if the file
  *                      is empty.
+ * @param clp           If not NULL, address where the cluster containing bn
+ *                      will be stored.
+ *                      stored 
  * @param bn            Block number.
  * @param flags         Flags passed to libblock.
@@ -177 +180 @@
 int
 _fat_block_get(block_t **block, fat_bs_t *bs, dev_handle_t dev_handle,
-    fat_cluster_t firstc, aoff64_t bn, int flags)
+    fat_cluster_t fcl, fat_cluster_t *clp, aoff64_t bn, int flags)
 {
         uint16_t clusters;
         unsigned max_clusters;
-        fat_cluster_t lastc;
+        fat_cluster_t c;
         int rc;
 
@@ -187 +190 @@
          * This function can only operate on non-zero length files.
          */
-        if (firstc == FAT_CLST_RES0)
+        if (fcl == FAT_CLST_RES0)
                 return ELIMIT;
 
-        if (firstc == FAT_CLST_ROOT) {
+        if (fcl == FAT_CLST_ROOT) {
                 /* root directory special case */
                 assert(bn < RDS(bs));
@@ -199 +202 @@
 
         max_clusters = bn / SPC(bs);
-        rc = fat_cluster_walk(bs, dev_handle, firstc, &lastc, &clusters,
-            max_clusters);
+        rc = fat_cluster_walk(bs, dev_handle, fcl, &c, &clusters, max_clusters);
         if (rc != EOK)
                 return rc;
         assert(clusters == max_clusters);
 
-        rc = block_get(block, dev_handle, CLBN2PBN(bs, lastc, bn), flags);
+        rc = block_get(block, dev_handle, CLBN2PBN(bs, c, bn), flags);
+
+        if (clp)
+                *clp = c;
 
         return rc;
@@ -251 +256 @@
         for (o = boundary; o < pos; o += BPS(bs)) {
                 rc = _fat_block_get(&b, bs, nodep->idx->dev_handle, mcl,
-                    (o - boundary) / BPS(bs), BLOCK_FLAGS_NOREAD);
+                    NULL, (o - boundary) / BPS(bs), BLOCK_FLAGS_NOREAD);
                 if (rc != EOK)
                         return rc;
@@ -606 +611 @@
 
         for (i = 0; i < SPC(bs); i++) {
-                rc = _fat_block_get(&b, bs, dev_handle, c, i,
+                rc = _fat_block_get(&b, bs, dev_handle, c, NULL, i,
                     BLOCK_FLAGS_NOREAD);
                 if (rc != EOK)