NTFS: Change ntfs_rl_truncate_nolock() to throw away the runlist if the new (3ffc5a44) · Commits · 戴 / test

fs/ntfs/ChangeLog

+2 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,8 @@ ToDo/Notes:
		- Report unrepresentable inodes during ntfs_readdir() as KERN_WARNING
		messages and include the inode number. Thanks to Yura Pakhuchiy for
		pointing this out.
		- Change ntfs_rl_truncate_nolock() to throw away the runlist if the new
		length is zero.

		2.1.23 - Implement extension of resident files and make writing safe as well as
		many bug fixes, cleanups, and enhancements...

+13 −1

Original line number	Diff line number	Diff line
		@@ -1455,6 +1455,7 @@ err_out:

		/**
		* ntfs_rl_truncate_nolock - truncate a runlist starting at a specified vcn
		* @vol: ntfs volume (needed for error output)
		* @runlist: runlist to truncate
		* @new_length: the new length of the runlist in VCNs
		*
		@@ -1462,12 +1463,16 @@ err_out:
		* holding the runlist elements to a length of @new_length VCNs.
		*
		* If @new_length lies within the runlist, the runlist elements with VCNs of
		* @new_length and above are discarded.
		* @new_length and above are discarded. As a special case if @new_length is
		* zero, the runlist is discarded and set to NULL.
		*
		* If @new_length lies beyond the runlist, a sparse runlist element is added to
		* the end of the runlist @runlist or if the last runlist element is a sparse
		* one already, this is extended.
		*
		* Note, no checking is done for unmapped runlist elements. It is assumed that
		* the caller has mapped any elements that need to be mapped already.
		*
		* Return 0 on success and -errno on error.
		*
		* Locking: The caller must hold @runlist->lock for writing.
		@@ -1482,6 +1487,13 @@ int ntfs_rl_truncate_nolock(const ntfs_volume vol, runlist const runlist,
		BUG_ON(!runlist);
		BUG_ON(new_length < 0);
		rl = runlist->rl;
		if (!new_length) {
		ntfs_debug("Freeing runlist.");
		runlist->rl = NULL;
		if (rl)
		ntfs_free(rl);
		return 0;
		}
		if (unlikely(!rl)) {
		/*
		* Create a runlist consisting of a sparse runlist element of