[PATCH 8/25] NTFS: Change ntfs_rl_truncate_nolock() to throw away the runlist if the new
length is zero.
Signed-off-by: Anton Altaparmakov <[email protected]>
---
fs/ntfs/ChangeLog | 2 ++
fs/ntfs/runlist.c | 14 +++++++++++++-
2 files changed, 15 insertions(+), 1 deletions(-)
3ffc5a443824fcf426d8d35dc632acc4dd9fb6d1
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -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...
diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -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_v
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
-
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