Changeset 1c1c736 in mainline for uspace/srv/fs/ext4fs/ext4fs_ops.c

Timestamp:

2011-11-08T13:05:43Z (13 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

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

Children:

0f09d4ea

Parents:

e31e56a1

Message:

not functional block allocation + write operation skeleton

File:

• uspace/srv/fs/ext4fs/ext4fs_ops.c (modified) (4 diffs)

uspace/srv/fs/ext4fs/ext4fs_ops.c

@@ -926 +926 @@
     size_t *wbytes, aoff64_t *nsize)
 {
-        EXT4FS_DBG("not supported");
-
-        // TODO
-        return ENOTSUP;
+        EXT4FS_DBG("");
+
+        int rc;
+        fs_node_t *fn;
+        ext4fs_node_t *enode;
+        ext4_filesystem_t *fs;
+        ext4_inode_ref_t *inode_ref;
+        ipc_callid_t callid;
+        size_t len, bytes, block_size;
+        block_t *write_block;
+        uint32_t fblock, iblock;
+
+        rc = ext4fs_node_get(&fn, service_id, index);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        if (!async_data_write_receive(&callid, &len)) {
+                rc = EINVAL;
+                ext4fs_node_put(fn);
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+
+        enode = EXT4FS_NODE(fn);
+        inode_ref = enode->inode_ref;
+        fs = enode->instance->filesystem;
+
+        block_size = ext4_superblock_get_block_size(fs->superblock);
+
+        // Prevent writing to more than one block
+        bytes = min(len, block_size - (pos % block_size));
+
+        EXT4FS_DBG("bytes == \%u", bytes);
+
+        iblock =  pos / block_size;
+
+        rc = ext4_filesystem_get_inode_data_block_index(fs, inode_ref->inode, iblock, &fblock);
+
+
+        // TODO allocation if fblock == 0
+        if (fblock == 0) {
+                EXT4FS_DBG("Allocate block !!!");
+
+                return ENOTSUP;
+        }
+
+        // TODO flags
+        rc = block_get(&write_block, service_id, fblock, 0);
+        if (rc != EOK) {
+                ext4fs_node_put(fn);
+                async_answer_0(callid, rc);
+                return rc;
+        }
+
+        /*
+        if (flags == BLOCK_FLAGS_NOREAD)
+                memset(b->data, 0, sbi->block_size);
+        */
+
+        async_data_write_finalize(callid, write_block->data + (pos % block_size), bytes);
+        write_block->dirty = true;
+
+        rc = block_put(write_block);
+        if (rc != EOK) {
+                ext4fs_node_put(fn);
+                return rc;
+        }
+
+        /*
+        if (pos + bytes > ino_i->i_size) {
+                ino_i->i_size = pos + bytes;
+                ino_i->dirty = true;
+        }
+        *nsize = ino_i->i_size;
+        *wbytes = bytes;
+        */
+        return ext4fs_node_put(fn);
 }
 
@@ -957 +1032 @@
         if (! ext4_inode_can_truncate(fs->superblock, inode_ref->inode)) {
                 // Unable to truncate
+                ext4fs_node_put(fn);
                 return EINVAL;
         }
@@ -963 +1039 @@
 
         if (old_size == new_size) {
-                rc = EOK;
+                ext4fs_node_put(fn);
+                return EOK;
         } else {
 
@@ -1005 +1082 @@
 
         ext4fs_node_put(fn);
-        return rc;
+
+        return EOK;
 }