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* syscalls.cc (rename): Use volume serial numbers stored in path_conv 

rather than fetching them here for the "same file" test.  Change
	comment to reflect this.
This commit is contained in:
Corinna Vinschen 2008-04-29 09:24:54 +00:00
parent b1d07c81ca
commit 59c7f5bcdf
2 changed files with 13 additions and 15 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2008-04-29 Corinna Vinschen <corinna@vinschen.de>
* syscalls.cc (rename): Use volume serial numbers stored in path_conv
rather than fetching them here for the "same file" test. Change
comment to reflect this.
2008-04-28 Corinna Vinschen <corinna@vinschen.de>
* path.cc (symlink_info::check): Avoid special handling for

22
winsup/cygwin/syscalls.cc
View File

@ -1740,12 +1740,14 @@ rename (const char *oldpath, const char *newpath)
/* SUSv3: If the old argument and the new argument resolve to the same
existing file, rename() shall return successfully and perform no
other action.
The test tries to be as quick as possible. First it tests if oldpath
has more than 1 hardlink, then it opens newpath and tests for identical
file ids. If so, it tests for identical volume serial numbers, If so,
oldpath and newpath refer to the same file. */
The test tries to be as quick as possible. First it tests for identical
volume serial numbers because that information is available anyway.
Then it tests if oldpath has more than 1 hardlink, then it opens newpath
and tests for identical file ids. If so, oldpath and newpath refer to
the same file. */
if ((removepc || dstpc->exists ())
&& !oldpc.isdir ()
&& dstpc->fs_serial_number () == oldpc.fs_serial_number ()
&& NT_SUCCESS (NtQueryInformationFile (fh, &io, &ofsi, sizeof ofsi,
FileStandardInformation))
&& ofsi.NumberOfLinks > 1
@ -1756,23 +1758,13 @@ rename (const char *oldpath, const char *newpath)
| ((removepc ?: dstpc)->is_rep_symlink ()
? FILE_OPEN_REPARSE_POINT : 0))))
{
static const size_t vsiz = sizeof (FILE_FS_VOLUME_INFORMATION)
+ 32 * sizeof (WCHAR);
FILE_INTERNAL_INFORMATION ofii, nfii;
PFILE_FS_VOLUME_INFORMATION opffvi, npffvi;
if (NT_SUCCESS (NtQueryInformationFile (fh, &io, &ofii, sizeof ofii,
FileInternalInformation))
&& NT_SUCCESS (NtQueryInformationFile (nfh, &io, &nfii, sizeof nfii,
FileInternalInformation))
&& ofii.FileId.QuadPart == nfii.FileId.QuadPart
&& (opffvi = (PFILE_FS_VOLUME_INFORMATION) alloca (vsiz))
&& (npffvi = (PFILE_FS_VOLUME_INFORMATION) alloca (vsiz))
&& NT_SUCCESS (NtQueryVolumeInformationFile (fh, &io, opffvi, vsiz,
FileFsVolumeInformation))
&& NT_SUCCESS (NtQueryVolumeInformationFile (nfh, &io, npffvi, vsiz,
FileFsVolumeInformation))
&& opffvi->VolumeSerialNumber == npffvi->VolumeSerialNumber)
&& ofii.FileId.QuadPart == nfii.FileId.QuadPart)
{
debug_printf ("%s and %s are the same file", oldpath, newpath);
NtClose (nfh);