Example #1
0
static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
{
	/* origin == SEEK_END => we must revalidate the cached file length */
	if (origin == SEEK_END) {
		int rc;
		struct inode *inode = file->f_path.dentry->d_inode;

		/*
		 * We need to be sure that all dirty pages are written and the
		 * server has the newest file length.
		 */
		if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
		    inode->i_mapping->nrpages != 0) {
			rc = filemap_fdatawait(inode->i_mapping);
			if (rc) {
				mapping_set_error(inode->i_mapping, rc);
				return rc;
			}
		}
		/*
		 * Some applications poll for the file length in this strange
		 * way so we must seek to end on non-oplocked files by
		 * setting the revalidate time to zero.
		 */
		CIFS_I(inode)->time = 0;

		rc = cifs_revalidate_file_attr(file);
		if (rc < 0)
			return (loff_t)rc;
	}
	return generic_file_llseek_unlocked(file, offset, origin);
}
Example #2
0
static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
{
	/*
	 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
	 * the cached file length
	 */
	if (whence != SEEK_SET && whence != SEEK_CUR) {
		int rc;
		struct inode *inode = file_inode(file);

		/*
		 * We need to be sure that all dirty pages are written and the
		 * server has the newest file length.
		 */
		if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
		    inode->i_mapping->nrpages != 0) {
			rc = filemap_fdatawait(inode->i_mapping);
			if (rc) {
				mapping_set_error(inode->i_mapping, rc);
				return rc;
			}
		}
		/*
		 * Some applications poll for the file length in this strange
		 * way so we must seek to end on non-oplocked files by
		 * setting the revalidate time to zero.
		 */
		CIFS_I(inode)->time = 0;

		rc = cifs_revalidate_file_attr(file);
		if (rc < 0)
			return (loff_t)rc;
	}
	return generic_file_llseek(file, offset, whence);
}