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Handle unlinking in-use files on virtual drives

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* path.cc (path_conv::set_nt_native_path): New function.
        * path.h (path_conv::set_nt_native_path): Add prototype.
        * syscall.cc (try_to_bin): Handle moving files to the recycler
        accessed via a local virtual drive (subst).  Fix a problem renaming
        the file to the unique replacement name on Samba.  Align comment.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-04-23 15:02:32 +02:00
parent 4e99630cfd
commit 5abb0ed13c
4 changed files with 46 additions and 3 deletions
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8
winsup/cygwin/ChangeLog
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@@ -1,3 +1,11 @@
2015-04-23 Corinna Vinschen <corinna@vinschen.de>
* path.cc (path_conv::set_nt_native_path): New function.
* path.h (path_conv::set_nt_native_path): Add prototype.
* syscall.cc (try_to_bin): Handle moving files to the recycler
accessed via a local virtual drive (subst). Fix a problem renaming
the file to the unique replacement name on Samba. Align comment.
2015-04-22 Corinna Vinschen <corinna@vinschen.de>
* fhandler_tty.cc (fhandler_pty_slave::fch_close_handles): Don't close

12
winsup/cygwin/path.cc
View File

@@ -486,6 +486,18 @@ get_nt_native_path (const char *path, UNICODE_STRING& upath, bool dos)
return &upath;
}
/* Handle with extrem care! Only used in a certain instance in try_to_bin.
Every other usage needs a careful check. */
void
path_conv::set_nt_native_path (PUNICODE_STRING new_path)
{
wide_path = (PWCHAR) crealloc_abort (wide_path, new_path->MaximumLength);
memcpy (wide_path, new_path->Buffer, new_path->Length);
uni_path.Length = new_path->Length;
uni_path.MaximumLength = new_path->MaximumLength;
uni_path.Buffer = wide_path;
}
PUNICODE_STRING
path_conv::get_nt_native_path ()
{

1
winsup/cygwin/path.h
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@@ -270,6 +270,7 @@ class path_conv
~path_conv ();
inline const char *get_win32 () const { return path; }
void set_nt_native_path (PUNICODE_STRING);
PUNICODE_STRING get_nt_native_path ();
inline POBJECT_ATTRIBUTES get_object_attr (OBJECT_ATTRIBUTES &attr,
SECURITY_ATTRIBUTES &sa)

28
winsup/cygwin/syscalls.cc
View File

@@ -314,15 +314,35 @@ try_to_bin (path_conv &pc, HANDLE &fh, ACCESS_MASK access, ULONG flags)
RtlAppendUnicodeToString (&recycler, L"\\Recycled\\");
else
goto out;
/* Is the file a subdir of the recycler? */
RtlInitCountedUnicodeString(&fname, pfni->FileName, pfni->FileNameLength);
/* Is the file a subdir of the recycler? */
if (RtlEqualUnicodePathPrefix (&fname, &recycler, TRUE))
goto out;
/* Is fname the recycler? Temporarily hide trailing backslash. */
recycler.Length -= sizeof (WCHAR);
if (RtlEqualUnicodeString (&fname, &recycler, TRUE))
goto out;
/* Is fname really a subcomponent of the full path? If not, there's
a high probability we're acessing the file via a virtual drive
created with "subst". Check and accommodate it. Note that we
ony get here if the virtual drive is really pointing to a local
drive. Otherwise pc.isremote () returns "true". */
if (!RtlEqualUnicodePathSuffix (pc.get_nt_native_path (), &fname, TRUE))
{
WCHAR drive[3] = { pc.get_nt_native_path ()->Buffer[4], ':', '\0' };
PWCHAR tgt = tp.w_get ();
if (QueryDosDeviceW (drive, tgt, NT_MAX_PATH)
&& !wcsncmp (tgt, L"\\??\\", 4))
{
UNICODE_STRING new_path;
wcsncpy (tgt + 6, fname.Buffer, fname.Length / sizeof (WCHAR));
RtlInitCountedUnicodeString(&new_path, tgt,
6 * sizeof (WCHAR) + fname.Length);
pc.set_nt_native_path (&new_path);
}
}
/* Create root dir path from file name information. */
RtlSplitUnicodePath (&fname, &fname, NULL);
RtlSplitUnicodePath (pc.get_nt_native_path (), &root, NULL);
@@ -367,9 +387,11 @@ try_to_bin (path_conv &pc, HANDLE &fh, ACCESS_MASK access, ULONG flags)
starting at U+dc00. Use plain ASCII chars on filesystems not supporting
Unicode. The rest of the filename is the inode number in hex encoding
and a hash of the full NT path in hex. The combination allows to remove
multiple hardlinks to the same file. */
multiple hardlinks to the same file. Samba doesn't like the transposed
names. */
RtlAppendUnicodeToString (&recycler,
pc.fs_flags () & FILE_UNICODE_ON_DISK
(pc.fs_flags () & FILE_UNICODE_ON_DISK
&& !pc.fs_is_samba ())
? L".\xdc63\xdc79\xdc67" : L".cyg");
pfii = (PFILE_INTERNAL_INFORMATION) infobuf;
/* Note: Modern Samba versions apparently don't like buffer sizes of more