ext4: special inode creation support

[lwext4.git] / src / ext4.c

diff --git a/src/ext4.c b/src/ext4.c
index db7745f678043ef1a5565733533af2d74af95757..0f2f07af9a879bc9904fc5078377cccb0d3332f9 100644 (file)
--- a/src/ext4.c
+++ b/src/ext4.c
@@ -2413,6 +2413,72 @@ Finish:
        return r;
 }
 
+static int ext4_mknod_set(ext4_file *f, uint32_t dev)
+{
+       struct ext4_inode_ref ref;
+       int r;
+
+       ext4_assert(f && f->mp);
+
+       r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
+       if (r != EOK)
+               return r;
+
+       ext4_inode_set_dev(ref.inode, dev);
+
+       ext4_inode_set_size(ref.inode, 0);
+       ref.dirty = true;
+
+       f->fsize = 0;
+       f->fpos = 0;
+
+       r = ext4_fs_put_inode_ref(&ref);
+       return r;
+}
+
+int ext4_mknod(const char *path, int filetype, uint32_t dev)
+{
+       struct ext4_mountpoint *mp = ext4_get_mount(path);
+       int r;
+       ext4_file f;
+
+       if (!mp)
+               return ENOENT;
+
+       if (mp->fs.read_only)
+               return EROFS;
+
+       if (filetype == EXT4_DE_UNKNOWN ||
+           filetype == EXT4_DE_REG_FILE ||
+           filetype == EXT4_DE_DIR)
+               return EINVAL;
+
+       EXT4_MP_LOCK(mp);
+       ext4_trans_start(mp);
+
+       ext4_block_cache_write_back(mp->fs.bdev, 1);
+       r = ext4_generic_open2(&f, path, O_RDWR|O_CREAT, filetype, NULL, NULL);
+       if (r == EOK) {
+               if (filetype == EXT4_DE_CHRDEV ||
+                   filetype == EXT4_DE_BLKDEV)
+                       r = ext4_mknod_set(&f, dev);
+       } else
+               goto Finish;
+
+       ext4_fclose(&f);
+
+Finish:
+       ext4_block_cache_write_back(mp->fs.bdev, 0);
+
+       if (r != EOK)
+               ext4_trans_abort(mp);
+       else
+               ext4_trans_stop(mp);
+
+       EXT4_MP_UNLOCK(mp);
+       return r;
+}
+
 int ext4_setxattr(const char *path, const char *name, size_t name_len,
                  const void *data, size_t data_size, bool replace __unused)
 {