Changeset bb7e8382 in mainline for uspace/srv/fs/minixfs/mfs_ops.c

Timestamp:

2011-04-22T20:12:58Z (13 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

6b40ea7

Parents:

48de019

Message:

Add the mfs_write() function implementation.

File:

• uspace/srv/fs/minixfs/mfs_ops.c (modified) (3 diffs)

uspace/srv/fs/minixfs/mfs_ops.c

@@ -36 +36 @@
 #include <fibril_synch.h>
 #include <errno.h>
+#include <align.h>
 #include "mfs.h"
 #include "mfs_utils.h"
@@ -525 +526 @@
         struct mfs_sb_info *sbi = parent->instance->sbi;
 
+        mfsdebug("mfs_link() %d\n", (int) child->ino_i->index);
+
         if (str_size(name) > sbi->max_name_len)
                 return ENAMETOOLONG;
-
-        mfsdebug("mfs_link() %d\n", (int) child->ino_i->index);
 
         int r = insert_dentry(parent, name, child->ino_i->index);
@@ -701 +702 @@
         async_answer_0(callid, tmp != EOK ? tmp : rc);
         async_answer_0(rid, tmp != EOK ? tmp : rc);
+}
+
+void
+mfs_write(ipc_callid_t rid, ipc_call_t *request)
+{
+        mfsdebug("mfs_write()\n");
+
+        devmap_handle_t handle = (devmap_handle_t) IPC_GET_ARG1(*request);
+        fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
+        aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*request),
+                                                IPC_GET_ARG4(*request));
+
+        fs_node_t *fn;
+        int r;
+        int flags = BLOCK_FLAGS_NONE;
+
+        r = mfs_node_get(&fn, handle, index);
+        if (r != EOK) {
+                async_answer_0(rid, r);
+                return;
+        }
+
+        if (!fn) {
+                async_answer_0(rid, ENOENT);
+                return;
+        }
+
+        ipc_callid_t callid;
+        size_t len;
+
+        if (!async_data_write_receive(&callid, &len)) {
+                r = EINVAL;
+                goto out_err;
+        }
+
+        struct mfs_node *mnode = fn->data;
+        struct mfs_sb_info *sbi = mnode->instance->sbi;
+        struct mfs_ino_info *ino_i = mnode->ino_i;
+        const size_t bs = sbi->block_size;
+        size_t bytes = min(len, bs - pos % bs);
+        size_t boundary = ROUND_UP(ino_i->i_size, bs);
+        uint32_t block;
+
+        if (bytes == bs)
+                flags = BLOCK_FLAGS_NOREAD;
+
+        if (pos < boundary) {
+                r = read_map(&block, mnode, pos);
+                on_error(r, goto out_err);
+
+                if (block == 0) {
+                        /*Writing in a sparse block*/
+                        r = mfs_alloc_bit(mnode->instance, &block, BMAP_ZONE);
+                        on_error(r, goto out_err);
+                        flags = BLOCK_FLAGS_NOREAD;
+                }
+        } else {
+                uint32_t dummy;
+
+                r = mfs_alloc_bit(mnode->instance, &block, BMAP_ZONE);
+                on_error(r, goto out_err);
+
+                r = write_map(mnode, pos, block, &dummy);
+                on_error(r, goto out_err);
+        }
+
+        block_t *b;
+        r = block_get(&b, handle, block, flags);
+        on_error(r, goto out_err);
+
+        async_data_write_finalize(callid, b->data + pos % bs, bytes);
+        b->dirty = true;
+
+        r = block_put(b);
+        if (r != EOK) {
+                mfs_node_put(fn);
+                async_answer_0(rid, r);
+                return;
+        }
+
+        ino_i->i_size = pos + bytes;
+        ino_i->dirty = true;
+        r = mfs_node_put(fn);
+        async_answer_2(rid, r, bytes, pos + bytes);
+        return;
+
+out_err:
+        mfs_node_put(fn);
+        async_answer_0(callid, r);
+        async_answer_0(rid, r);
 }