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NTFS: Change ntfs_rl_truncate_nolock() to throw away the runlist if the new 

length is zero.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-09-08 20:23:06 +01:00
parent f94ad38e68
commit 3ffc5a4438
2 changed files with 15 additions and 1 deletions
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2
fs/ntfs/ChangeLog
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@ -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...

14
fs/ntfs/runlist.c
View File

@ -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