Changeset df38657 in mainline

Timestamp:

2011-03-09T11:57:45Z (13 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

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

Children:

529edc66

Parents:

b83e16ff

Message:

Reorganize ext2fs_read_directory and skip . and .. entries

File:

• uspace/srv/fs/ext2fs/ext2fs_ops.c (modified) (4 diffs)

uspace/srv/fs/ext2fs/ext2fs_ops.c

@@ -603 +603 @@
                 ext2fs_read_directory(rid, callid, pos, size, inst, inode_ref);
         }
-        
-        // Other inode types not supported
-        async_answer_0(callid, ENOTSUP);
-        async_answer_0(rid, ENOTSUP);
+        else {
+                // Other inode types not supported
+                async_answer_0(callid, ENOTSUP);
+                async_answer_0(rid, ENOTSUP);
+        }
+        
+        ext2_filesystem_put_inode_ref(inode_ref);
+        
 }
 
@@ -617 +621 @@
         size_t name_size;
         int rc;
+        bool found = false;
         
         rc = ext2_directory_iterator_init(&it, inst->filesystem, inode_ref);
@@ -625 +630 @@
         }
         
+        // Find the index we want to read
+        // Note that we need to iterate and count as
+        // the underlying structure is a linked list
+        // Moreover, we want to skip . and .. entries
+        // as these are not used in HelenOS
         cur = 0;
         while (it.current != NULL) {
-                if (it.current->inode != 0) {
-                        if (cur == pos) {
-                                // This is the dir entry we want to read
-                                name_size = ext2_directory_entry_ll_get_name_length(
-                                        inst->filesystem->superblock, it.current);
-                                // The on-disk entry does not contain \0 at the end
-                                // end of entry name, so we copy it to new buffer
-                                // and the \0 at the end
-                                buf = malloc(name_size+1);
-                                if (buf == NULL) {
-                                        ext2_directory_iterator_fini(&it);
-                                        async_answer_0(callid, ENOMEM);
-                                        async_answer_0(rid, ENOMEM);
-                                        return;
-                                }
-                                memcpy(buf, &it.current->name, name_size);
-                                *(buf+name_size) = 0;
-                                (void) async_data_read_finalize(callid, buf, name_size+1);
-                                break;
+                if (it.current->inode == 0) {
+                        goto skip;
+                }
+                
+                name_size = ext2_directory_entry_ll_get_name_length(
+                        inst->filesystem->superblock, it.current);
+                
+                // skip . and ..
+                if ((name_size == 1 || name_size == 2) && it.current->name == '.') {
+                        if (name_size == 1) {
+                                goto skip;
                         }
-                        cur++;
+                        else if (name_size == 2 && *(&it.current->name+1) == '.') {
+                                goto skip;
+                        }
                 }
                 
+                // Is this the dir entry we want to read?
+                if (cur == pos) {
+                        // The on-disk entry does not contain \0 at the end
+                        // end of entry name, so we copy it to new buffer
+                        // and add the \0 at the end
+                        buf = malloc(name_size+1);
+                        if (buf == NULL) {
+                                ext2_directory_iterator_fini(&it);
+                                async_answer_0(callid, ENOMEM);
+                                async_answer_0(rid, ENOMEM);
+                                return;
+                        }
+                        memcpy(buf, &it.current->name, name_size);
+                        *(buf+name_size) = 0;
+                        found = true;
+                        (void) async_data_read_finalize(callid, buf, name_size+1);
+                        free(buf);
+                        break;
+                }
+                cur++;
+                
+skip:
                 rc = ext2_directory_iterator_next(&it);
                 if (rc != EOK) {
@@ -661 +687 @@
         rc = ext2_directory_iterator_fini(&it);
         if (rc != EOK) {
-                async_answer_0(rid, ENOMEM);
-                return;
-        }
-        
-        async_answer_1(rid, EOK, 1);
+                async_answer_0(rid, rc);
+                return;
+        }
+        
+        if (found) {
+                async_answer_1(rid, EOK, 1);
+        }
+        else {
+                async_answer_0(callid, ENOENT);
+                async_answer_0(rid, ENOENT);
+        }
 }