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readdir() with mount point dentry, return mount point INO 

This patch fixes a minor compatibility issue w/ cygwin mount point handling in
readdir(), compared to equivalent behavior of Linux and MacOS. dentry.d_ino
should indicate the INO of the mount point itself, not the target volume root
folder.

Changed return type from readdir_check_reparse_point to uint8_t, to avoid
unnecessarily being implicitly cast to and from a signed int.

Renamed a related local variable "attr" to "oattr" that was eclipsing a member
variable with the same name.

Joe L.
This commit is contained in:
Joe Lowe 2017-06-13 11:12:50 -07:00 committed by Corinna Vinschen
parent 35cd6863fb
commit 0a9edd73e3
1 changed files with 10 additions and 23 deletions
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33
winsup/cygwin/fhandler_disk_file.cc
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@ -178,10 +178,10 @@ path_conv::isgood_inode (ino_t ino) const
are directory mount points, which are treated as symlinks.
IO_REPARSE_TAG_SYMLINK types are always symlinks. We don't know
anything about other reparse points, so they are treated as unknown. */
static inline int
static inline uint8_t
readdir_check_reparse_point (POBJECT_ATTRIBUTES attr)
{
DWORD ret = DT_UNKNOWN;
uint8_t ret = DT_UNKNOWN;
IO_STATUS_BLOCK io;
HANDLE reph;
UNICODE_STRING subst;
@ -2016,32 +2016,19 @@ fhandler_disk_file::readdir_helper (DIR *dir, dirent *de, DWORD w32_err,
de->d_type = DT_REG;
}
/* Check for directory reparse point. These are potential volume mount
points which have another inode than the underlying directory. */
/* Check for directory reparse point. These may be treated as a posix
symlink, or as mount point, so need to figure out whether to return
a directory or link type. In all cases, returning the INO of the
reparse point (not of the target) matches behavior of posix systems.
*/
if ((attr & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
== (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
{
HANDLE reph;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
OBJECT_ATTRIBUTES oattr;
InitializeObjectAttributes (&attr, fname, pc.objcaseinsensitive (),
InitializeObjectAttributes (&oattr, fname, pc.objcaseinsensitive (),
get_handle (), NULL);
de->d_type = readdir_check_reparse_point (&attr);
if (de->d_type == DT_DIR)
{
/* Volume mountpoints are treated as directories. We have to fix
the inode number, otherwise we have the inode number of the
mount point, rather than the inode number of the toplevel
directory of the mounted drive. */
if (NT_SUCCESS (NtOpenFile (&reph, READ_CONTROL, &attr, &io,
FILE_SHARE_VALID_FLAGS,
FILE_OPEN_FOR_BACKUP_INTENT)))
{
de->d_ino = pc.get_ino_by_handle (reph);
NtClose (reph);
}
}
de->d_type = readdir_check_reparse_point (&oattr);
}
/* Check for Windows shortcut. If it's a Cygwin or U/WIN symlink, drop the