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* fhandler_disk_file.cc (fhandler_disk_file::opendir): Try to open 

directory with stat()-friendly access mask first.  Explain why.
This commit is contained in:
Corinna Vinschen 2010-02-19 13:28:49 +00:00
parent eb67604071
commit 1929fc8ece
2 changed files with 37 additions and 10 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2010-02-19 Corinna Vinschen <corinna@vinschen.de>
* fhandler_disk_file.cc (fhandler_disk_file::opendir): Try to open
directory with stat()-friendly access mask first. Explain why.
2010-02-19 Corinna Vinschen <corinna@vinschen.de>
* fhandler_disk_file.cc (fhandler_base::fstat_helper): Set st_rdev

42
winsup/cygwin/fhandler_disk_file.cc
View File

@ -1660,19 +1660,41 @@ fhandler_disk_file::opendir (int fd)
OBJECT_ATTRIBUTES attr;
NTSTATUS status;
IO_STATUS_BLOCK io;
/* Tools like ls(1) call dirfd() to fetch the directory
descriptor for calls to facl or fstat. The tight access mask
used so far is not sufficient to reuse the handle for these
calls, instead the facl/fstat calls find the handle to be
unusable and have to re-open the file for reading attributes
and control data. So, what we do here is to try to open the
directory with more relaxed access mask which enables to use
the handle for the aforementioned purpose. This should work
in almost all cases. Only if it doesn't work due to
permission problems, we drop the additional access bits and
try again. */
ACCESS_MASK fstat_mask = READ_CONTROL | FILE_READ_ATTRIBUTES;
status = NtOpenFile (&get_handle (),
SYNCHRONIZE | FILE_LIST_DIRECTORY,
pc.get_object_attr (attr, sec_none_nih),
&io, FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT
| FILE_DIRECTORY_FILE);
if (!NT_SUCCESS (status))
do
{
__seterrno_from_nt_status (status);
goto free_mounts;
status = NtOpenFile (&get_handle (),
SYNCHRONIZE | FILE_LIST_DIRECTORY
| fstat_mask,
pc.get_object_attr (attr, sec_none_nih),
&io, FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT
| FILE_DIRECTORY_FILE);
if (!NT_SUCCESS (status))
{
if (status == STATUS_ACCESS_DENIED && fstat_mask)
fstat_mask = 0;
else
{
__seterrno_from_nt_status (status);
goto free_mounts;
}
}
}
while (!NT_SUCCESS (status));
}
/* FileIdBothDirectoryInformation is apparently unsupported on