Changeset 1baec4b in mainline

Timestamp:

2008-11-30T18:03:02Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

50b3d30

Parents:

36b8c5a6

Message:

Create "." and ".." entries on FAT.

Location:

uspace/srv/fs/fat

Files:

• fat_dentry.h (modified) (1 diff)
• fat_ops.c (modified) (2 diffs)

uspace/srv/fs/fat/fat_dentry.h

@@ -39 +39 @@
 #define FAT_NAME_LEN            8
 #define FAT_EXT_LEN             3
+
+#define FAT_NAME_DOT            ".       "
+#define FAT_NAME_DOT_DOT        "..      "
+#define FAT_EXT_PAD             "   "
 
 #define FAT_ATTR_RDONLY         (1 << 0)

uspace/srv/fs/fat/fat_ops.c

@@ -321 +321 @@
                 /*
                  * Populate the new cluster with unused dentries.
-                 * We don't create the '.' and '..' entries, since they are
-                 * optional and HelenOS VFS does not need them.
                  */
                 for (i = 0; i < bs->spc; i++) {
@@ -461 +459 @@
 
         futex_down(&childp->idx->lock);
+        
+        /*
+         * If possible, create the Sub-directory Identifier Entry and the
+         * Sub-directory Parent Pointer Entry (i.e. "." and ".."). These entries
+         * are not mandatory according to Standard ECMA-107 and HelenOS VFS does
+         * not use them anyway, so this is rather a sign of our good will.
+         */
+        b = fat_block_get(bs, childp, 0, BLOCK_FLAGS_NONE);
+        d = (fat_dentry_t *)b->data;
+        if (fat_classify_dentry(d) == FAT_DENTRY_LAST ||
+            strcmp(d->name, FAT_NAME_DOT) == 0) {
+                memset(d, 0, sizeof(fat_dentry_t));
+                strcpy(d->name, FAT_NAME_DOT);
+                strcpy(d->ext, FAT_EXT_PAD);
+                d->attr = FAT_ATTR_SUBDIR;
+                d->firstc = host2uint16_t_le(childp->firstc);
+                /* TODO: initialize also the date/time members. */
+        }
+        d++;
+        if (fat_classify_dentry(d) == FAT_DENTRY_LAST ||
+            strcmp(d->name, FAT_NAME_DOT_DOT) == 0) {
+                memset(d, 0, sizeof(fat_dentry_t));
+                strcpy(d->name, FAT_NAME_DOT_DOT);
+                strcpy(d->ext, FAT_EXT_PAD);
+                d->attr = FAT_ATTR_SUBDIR;
+                d->firstc = (parentp->firstc == FAT_CLST_ROOT) ?
+                    host2uint16_t_le(FAT_CLST_RES0) :
+                    host2uint16_t_le(parentp->firstc);
+                /* TODO: initialize also the date/time members. */
+        }
+        b->dirty = true;                /* need to sync block */
+        block_put(b);
+
         childp->idx->pfc = parentp->firstc;
         childp->idx->pdi = i * dps + j;