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* fhandler_disk_file.cc (fhandler_base::fstat_helper): Workaround

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another bug in NWFS.  Add comment to explain why.  Improve debug output
	in case the NT calls to test for binary fail.
	* path.h (path_conv::fs_is_cifs): New method.
	(path_conv::fs_is_nwfs): New method.
This commit is contained in:
Corinna Vinschen
2010-02-03 16:05:33 +00:00
parent 8b5c2e99d4
commit 4a49c71595
3 changed files with 36 additions and 7 deletions
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33
winsup/cygwin/fhandler_disk_file.cc
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@@ -659,27 +659,46 @@ fhandler_base::fstat_helper (struct __stat64 *buf,
if (pc.exec_state () == dont_know_if_executable)
{
OBJECT_ATTRIBUTES attr;
NTSTATUS status;
HANDLE h;
IO_STATUS_BLOCK io;
InitializeObjectAttributes (&attr, &ro_u_empty, 0, get_handle (),
NULL);
if (NT_SUCCESS (NtOpenFile (&h, SYNCHRONIZE | FILE_READ_DATA,
&attr, &io, FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT)))
/* The NWFS implementation is frighteningly incomplete. When
re-opening a file by handle, the subsequent NtReadFile
returns with the weird status STATUS_FILE_IS_A_DIRECTORY.
We're still using the re-open by handle method for all
other filesystems since it's 8-10% faster than opening
by name. */
if (pc.fs_is_nwfs ())
InitializeObjectAttributes (&attr, pc.get_nt_native_path (),
OBJ_CASE_INSENSITIVE, NULL, NULL)
else
InitializeObjectAttributes (&attr, &ro_u_empty, 0,
get_handle (), NULL);
status = NtOpenFile (&h, SYNCHRONIZE | FILE_READ_DATA,
&attr, &io, FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT);
if (NT_SUCCESS (status))
{
LARGE_INTEGER off = { QuadPart:0LL };
char magic[3];
if (NT_SUCCESS (NtReadFile (h, NULL, NULL, NULL, &io, magic,
3, &off, NULL))
status = NtReadFile (h, NULL, NULL, NULL, &io, magic,
3, &off, NULL);
if (NT_SUCCESS (status)
&& has_exec_chars (magic, io.Information))
{
pc.set_exec ();
buf->st_mode |= STD_XBITS;
}
else
debug_printf ("%p = NtReadFile(%S)", status,
pc.get_nt_native_path ());
NtClose (h);
}
else
debug_printf ("%p = NtOpenFile(%S)", status,
pc.get_nt_native_path ());
}
}
if (pc.exec_state () == is_executable)