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Workaround for filesystems with broken FileAllInformation info class (NcFsd) 

See discussion starting at https://cygwin.com/ml/cygwin/2016-07/msg00350.html

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-08-04 11:13:57 +02:00
parent 99a3f266c1
commit 9c4113f0c7
1 changed files with 24 additions and 1 deletions
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25
winsup/cygwin/path.cc
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@ -1305,8 +1305,31 @@ file_get_fai (HANDLE h, PFILE_ALL_INFORMATION pfai)
/* Some FSes (Netapps) don't implement FileNetworkOpenInformation. */
status = NtQueryInformationFile (h, &io, pfai, sizeof *pfai,
FileAllInformation);
if (status == STATUS_BUFFER_OVERFLOW)
if (likely (status == STATUS_BUFFER_OVERFLOW))
status = STATUS_SUCCESS;
/* Filesystems with broken FileAllInformation exist, too. See the thread
starting with https://cygwin.com/ml/cygwin/2016-07/msg00350.html. */
else if (!NT_SUCCESS (status) && status != STATUS_ACCESS_DENIED)
{
memset (pfai, 0, sizeof *pfai);
status = NtQueryInformationFile (h, &io, &pfai->BasicInformation,
sizeof pfai->BasicInformation,
FileBasicInformation);
if (NT_SUCCESS (status))
{
/* The return value of FileInternalInformation is largely ignored.
We only make absolutely sure the inode number is set to 0 in
case it fails. */
status = NtQueryInformationFile (h, &io, &pfai->InternalInformation,
sizeof pfai->InternalInformation,
FileInternalInformation);
if (!NT_SUCCESS (status))
pfai->InternalInformation.IndexNumber.QuadPart = 0LL;
status = NtQueryInformationFile (h, &io, &pfai->StandardInformation,
sizeof pfai->StandardInformation,
FileStandardInformation);
}
}
return status;
}