diff options
Diffstat (limited to 'fs/ntfs/runlist.c')
| -rw-r--r-- | fs/ntfs/runlist.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c index e4c4716939de..539fa2b7f361 100644 --- 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_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 |