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ntdll: Use swapping method to return . and .. as first entries.

This commit is contained in:
Grazvydas Ignotas 2011-08-04 23:24:49 +03:00 committed by Alexandre Julliard
parent fbf537fb60
commit 006413afe4
2 changed files with 94 additions and 57 deletions
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138
dlls/ntdll/directory.c
View File

@ -1486,22 +1486,56 @@ static int read_directory_vfat( int fd, IO_STATUS_BLOCK *io, void *buffer, ULONG
#endif /* VFAT_IOCTL_READDIR_BOTH */
#ifdef USE_GETDENTS
/***********************************************************************
* read_first_dent_name
*
* reads name of first or second dentry (if they have inodes).
*/
static char *read_first_dent_name( int which, int fd, off_t second_offs, KERNEL_DIRENT64 *de_first_two,
char *buffer, size_t size, BOOL *buffer_changed )
{
KERNEL_DIRENT64 *de;
int res;
de = de_first_two;
if (de != NULL)
{
if (which == 1)
de = (KERNEL_DIRENT64 *)((char *)de + de->d_reclen);
return de->d_ino ? de->d_name : NULL;
}
*buffer_changed = TRUE;
lseek( fd, which == 1 ? second_offs : 0, SEEK_SET );
res = getdents64( fd, buffer, size );
if (res <= 0)
return NULL;
de = (KERNEL_DIRENT64 *)buffer;
return de->d_ino ? de->d_name : NULL;
}
/***********************************************************************
* read_directory_getdents
*
* Read a directory using the Linux getdents64 system call; helper for NtQueryDirectoryFile.
*/
#ifdef USE_GETDENTS
static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, ULONG length,
BOOLEAN single_entry, const UNICODE_STRING *mask,
BOOLEAN restart_scan, FILE_INFORMATION_CLASS class )
{
off_t old_pos = 0;
static off_t second_entry_pos;
static struct file_identity last_dir_id;
off_t old_pos = 0, next_pos;
size_t size = length;
int res, fake_dot_dot = 1;
char *data, local_buffer[8192];
KERNEL_DIRENT64 *de;
KERNEL_DIRENT64 *de, *de_first_two = NULL;
union file_directory_info *info, *last_info = NULL;
const char *filename;
BOOL data_buffer_changed;
int res, swap_to;
if (size <= sizeof(local_buffer) || !(data = RtlAllocateHeap( GetProcessHeap(), 0, size )))
{
@ -1510,7 +1544,7 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
}
if (restart_scan) lseek( fd, 0, SEEK_SET );
else if (length < max_dir_info_size(class)) /* we may have to return a partial entry here */
else
{
old_pos = lseek( fd, 0, SEEK_CUR );
if (old_pos == -1 && errno == ENOENT)
@ -1522,6 +1556,21 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
}
io->u.Status = STATUS_SUCCESS;
de = (KERNEL_DIRENT64 *)data;
/* if old_pos is not 0 we don't know how many entries have been returned already,
* so maintain second_entry_pos to know when to return '..' */
if (old_pos != 0 && (last_dir_id.dev != curdir.dev || last_dir_id.ino != curdir.ino))
{
lseek( fd, 0, SEEK_SET );
res = getdents64( fd, data, size );
if (res > 0)
{
second_entry_pos = de->d_off;
last_dir_id = curdir;
}
lseek( fd, old_pos, SEEK_SET );
}
res = getdents64( fd, data, size );
if (res == -1)
@ -1534,52 +1583,46 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
goto done;
}
de = (KERNEL_DIRENT64 *)data;
if (restart_scan)
if (old_pos == 0 && res > 0)
{
/* check if we got . and .. from getdents */
if (res > 0)
{
if (!strcmp( de->d_name, "." ) && res > de->d_reclen)
{
KERNEL_DIRENT64 *next_de = (KERNEL_DIRENT64 *)(data + de->d_reclen);
if (!strcmp( next_de->d_name, ".." )) fake_dot_dot = 0;
}
}
/* make sure we have enough room for both entries */
if (fake_dot_dot)
{
const ULONG min_info_size = dir_info_size( class, 1 ) + dir_info_size( class, 2 );
if (length < min_info_size || single_entry)
{
FIXME( "not enough room %u/%u for fake . and .. entries\n", length, single_entry );
fake_dot_dot = 0;
}
}
if (fake_dot_dot)
{
if ((info = append_entry( buffer, io, length, ".", NULL, mask, class )))
last_info = info;
if ((info = append_entry( buffer, io, length, "..", NULL, mask, class )))
last_info = info;
/* check if we still have enough space for the largest possible entry */
if (last_info && io->Information + max_dir_info_size(class) > length)
{
lseek( fd, 0, SEEK_SET ); /* reset pos to first entry */
res = 0;
}
}
second_entry_pos = de->d_off;
last_dir_id = curdir;
if (res > de->d_reclen)
de_first_two = de;
}
while (res > 0)
{
res -= de->d_reclen;
if (de->d_ino &&
!(fake_dot_dot && (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." ))) &&
(info = append_entry( buffer, io, length, de->d_name, NULL, mask, class )))
next_pos = de->d_off;
filename = NULL;
/* we must return first 2 entries as "." and "..", but getdents64()
* can return them anywhere, so swap first entries with "." and ".." */
if (old_pos == 0)
filename = ".";
else if (old_pos == second_entry_pos)
filename = "..";
else if (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." ))
{
swap_to = !strcmp( de->d_name, "." ) ? 0 : 1;
data_buffer_changed = FALSE;
filename = read_first_dent_name( swap_to, fd, second_entry_pos, de_first_two,
data, size, &data_buffer_changed );
if (filename != NULL && (!strcmp( filename, "." ) || !strcmp( filename, ".." )))
filename = read_first_dent_name( swap_to ^ 1, fd, second_entry_pos, NULL,
data, size, &data_buffer_changed );
if (data_buffer_changed)
{
lseek( fd, next_pos, SEEK_SET );
res = 0;
}
}
else if (de->d_ino)
filename = de->d_name;
if (filename && (info = append_entry( buffer, io, length, filename, NULL, mask, class )))
{
last_info = info;
if (io->u.Status == STATUS_BUFFER_OVERFLOW)
@ -1590,17 +1633,18 @@ static int read_directory_getdents( int fd, IO_STATUS_BLOCK *io, void *buffer, U
/* check if we still have enough space for the largest possible entry */
if (single_entry || io->Information + max_dir_info_size(class) > length)
{
if (res > 0) lseek( fd, de->d_off, SEEK_SET ); /* set pos to next entry */
if (res > 0) lseek( fd, next_pos, SEEK_SET ); /* set pos to next entry */
break;
}
}
old_pos = de->d_off;
old_pos = next_pos;
/* move on to the next entry */
if (res > 0) de = (KERNEL_DIRENT64 *)((char *)de + de->d_reclen);
else
{
res = getdents64( fd, data, size );
de = (KERNEL_DIRENT64 *)data;
de_first_two = NULL;
}
}

9
dlls/ntdll/tests/directory.c
View File

@ -215,16 +215,9 @@ static void test_flags_NtQueryDirectoryFile(OBJECT_ATTRIBUTES *attr, const char
}
ok(numfiles < max_test_dir_size, "too many loops\n");
for (i=0; testfiles[i].name; i++) {
if ((strcmp(testfiles[i].name, ".") == 0 || strcmp(testfiles[i].name, "..") == 0) && (single_entry || !restart_flag)) {
todo_wine
for (i=0; testfiles[i].name; i++)
ok(testfiles[i].nfound == 1, "Wrong number %d of %s files found (ReturnSingleEntry=%d,RestartScan=%d)\n",
testfiles[i].nfound, testfiles[i].description, single_entry, restart_flag);
} else {
ok(testfiles[i].nfound == 1, "Wrong number %d of %s files found (ReturnSingleEntry=%d,RestartScan=%d)\n",
testfiles[i].nfound, testfiles[i].description, single_entry, restart_flag);
}
}
pNtClose(dirh);
}