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Fake volume serial number on filesystems not providing it

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* mount.cc (fs_info::update): Fake a serial number on filesystems not
	providing one.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-11-05 18:34:34 +01:00
parent 41299df081
commit c56dc181f9
2 changed files with 33 additions and 2 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2015-11-05 Corinna Vinschen <corinna@vinschen.de>
* mount.cc (fs_info::update): Fake a serial number on filesystems not
providing one.
2015-11-05 Corinna Vinschen <corinna@vinschen.de> 2015-11-05 Corinna Vinschen <corinna@vinschen.de>
* fcntl.cc (fcntl64): Don't lock fd table when performing locking. * fcntl.cc (fcntl64): Don't lock fd table when performing locking.

30
winsup/cygwin/mount.cc
View File

@ -182,8 +182,7 @@ fs_info::update (PUNICODE_STRING upath, HANDLE in_vol)
clear (); clear ();
/* Always caseinsensitive. We really just need access to the drive. */ /* Always caseinsensitive. We really just need access to the drive. */
InitializeObjectAttributes (&attr, upath, OBJ_CASE_INSENSITIVE, NULL, InitializeObjectAttributes (&attr, upath, OBJ_CASE_INSENSITIVE, NULL, NULL);
NULL);
if (in_vol) if (in_vol)
vol = in_vol; vol = in_vol;
else else
@ -232,6 +231,33 @@ fs_info::update (PUNICODE_STRING upath, HANDLE in_vol)
uint32_t hash = 0; uint32_t hash = 0;
if (NT_SUCCESS (status)) if (NT_SUCCESS (status))
{ {
/* If the FS doesn't return a valid serial number (PrlSF is a candidate),
create reproducible serial number from path. We need this to create
a unique per-drive/share hash. */
if (ffvi_buf.ffvi.VolumeSerialNumber == 0)
{
UNICODE_STRING path_prefix;
WCHAR *p;
if (upath->Buffer[5] == L':' && upath->Buffer[6] == L'\\')
p = upath->Buffer + 6;
else
{
/* We're expecting an UNC path. Move p to the backslash after
"\??\UNC\server\share" or the trailing NUL. */
p = upath->Buffer + 7; /* Skip "\??\UNC" */
int bs_cnt = 0;
while (*++p)
if (*p == L'\\')
if (++bs_cnt > 1)
break;
}
RtlInitCountedUnicodeString (&path_prefix, upath->Buffer,
(p - upath->Buffer) * sizeof (WCHAR));
ffvi_buf.ffvi.VolumeSerialNumber = hash_path_name ((ino_t) 0,
&path_prefix);
}
fs_info *fsi = fsi_cache.search (&ffvi_buf.ffvi, hash); fs_info *fsi = fsi_cache.search (&ffvi_buf.ffvi, hash);
if (fsi) if (fsi)
{ {