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* syscalls.cc (rename): Remove ill-conceived NFS workaround from

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2013-01-10 for self-inflicted NFS server problem.
This commit is contained in:
Corinna Vinschen
2013-01-19 14:54:18 +00:00
parent d5c977948b
commit a32a9a87a1
2 changed files with 8 additions and 46 deletions
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5
winsup/cygwin/ChangeLog
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@@ -1,3 +1,8 @@
2013-01-19 Corinna Vinschen <corinna@vinschen.de>
* syscalls.cc (rename): Remove ill-conceived NFS workaround from
2013-01-10 for self-inflicted NFS server problem.
2013-01-19 Christopher Faylor <me.cygwin2013@cgf.cx>
* exceptions.cc (ctrl_c_handler): Remove special-case handler for

49
winsup/cygwin/syscalls.cc
View File

@@ -2450,52 +2450,9 @@ retry:
pfri = (PFILE_RENAME_INFORMATION) tp.w_get ();
pfri->ReplaceIfExists = TRUE;
pfri->RootDirectory = NULL;
if (oldpc.fs_is_nfs ())
{
/* Workaround depressing NFS bug. FILE_RENAME_INFORMATION.FileName
*must* be relative to the parent directory of the original file,
otherwise NtSetInformationFile returns with STATUS_NOT_SAME_DEVICE.
Neither absolute paths, nor directory handle relative paths work
as expected! */
PWCHAR oldp, dstp;
/* Skip equivalent path prefix. We already know that both paths are
on the same drive anyway. */
for (oldp = oldpc.get_nt_native_path ()->Buffer,
dstp = dstpc->get_nt_native_path ()->Buffer;
*oldp == *dstp; ++oldp, ++dstp)
;
while (oldp[-1] != L'\\')
--oldp, --dstp;
/* Now oldp points to the first path component in oldpc different from
dstpc, vice versa for dstp and oldpc. To create a dstpc path relative
to oldpc, we now have to prepend as many ".." components to dstp, as
are still available in oldp. Example:
oldpc = \??\UNC\server\a\b\c\d\e
dstpc = \??\UNC\server\a\b\f\g
prefix: \??\UNC\server\a\b\
oldp: c\d\e
dstp: f\g
dstp expressed relative to e's parent dir: ..\..\f\g
So what we do here is to count the number of backslashes in oldp and
prepend one "..\" to dstp for each of them. */
PWCHAR newdst = tp.w_get ();
PWCHAR newp = newdst;
while ((oldp = wcschr (++oldp, L'\\')) != NULL)
newp = wcpcpy (newp, L"..\\");
newp = wcpcpy (newp, dstp);
pfri->FileNameLength = (newp - newdst) * sizeof (WCHAR);
memcpy (&pfri->FileName, newdst, pfri->FileNameLength);
}
else
{
pfri->FileNameLength = dstpc->get_nt_native_path ()->Length;
memcpy (&pfri->FileName, dstpc->get_nt_native_path ()->Buffer,
pfri->FileNameLength);
}
pfri->FileNameLength = dstpc->get_nt_native_path ()->Length;
memcpy (&pfri->FileName, dstpc->get_nt_native_path ()->Buffer,
pfri->FileNameLength);
status = NtSetInformationFile (fh, &io, pfri,
sizeof *pfri + pfri->FileNameLength,
FileRenameInformation);