/*
Perform special function on a directory
*/
int UMSDOS_ioctl_dir (
struct inode *dir,
struct file *filp,
unsigned int cmd,
unsigned long data)
{
int ret = -EPERM;
/* #Specification: ioctl / acces
Only root (effective id) is allowed to do IOCTL on directory
in UMSDOS. EPERM is returned for other user.
*/
if (current->euid == 0
|| cmd == UMSDOS_GETVERSION){
struct umsdos_ioctl *idata = (struct umsdos_ioctl *)data;
ret = -EINVAL;
/* #Specification: ioctl / prototypes
The official prototype for the umsdos ioctl on directory
is:
int ioctl (
int fd, // File handle of the directory
int cmd, // command
struct umsdos_ioctl *data)
The struct and the commands are defined in linux/umsdos_fs.h.
umsdos_progs/umsdosio.c provide an interface in C++ to all
these ioctl. umsdos_progs/udosctl is a small utility showing
all this.
These ioctl generally allow one to work on the EMD or the
DOS directory independently. These are essential to implement
the synchronise.
*/
PRINTK (("ioctl %d ",cmd));
if (cmd == UMSDOS_GETVERSION){
/* #Specification: ioctl / UMSDOS_GETVERSION
The field version and release of the structure
umsdos_ioctl are filled with the version and release
number of the fs code in the kernel. This will allow
some form of checking. Users won't be able to run
incompatible utility such as the synchroniser (umssync).
umsdos_progs/umsdosio.c enforce this checking.
Return always 0.
*/
put_fs_byte (UMSDOS_VERSION,&idata->version);
put_fs_byte (UMSDOS_RELEASE,&idata->release);
ret = 0;
}else if (cmd == UMSDOS_READDIR_DOS){
/* #Specification: ioctl / UMSDOS_READDIR_DOS
One entry is read from the DOS directory at the current
file position. The entry is put as is in the dos_dirent
field of struct umsdos_ioctl.
Return > 0 if success.
*/
ret = msdos_readdir(dir,filp,&idata->dos_dirent,1);
}else if (cmd == UMSDOS_READDIR_EMD){
/* #Specification: ioctl / UMSDOS_READDIR_EMD
One entry is read from the EMD at the current
file position. The entry is put as is in the umsdos_dirent
field of struct umsdos_ioctl. The corresponding mangled
DOS entry name is put in the dos_dirent field.
All entries are read including hidden links. Blank
entries are skipped.
Return > 0 if success.
*/
struct inode *emd_dir = umsdos_emd_dir_lookup (dir,0);
if (emd_dir != NULL){
while (1){
if (filp->f_pos >= emd_dir->i_size){
ret = 0;
break;
}else{
struct umsdos_dirent entry;
off_t f_pos = filp->f_pos;
ret = umsdos_emd_dir_readentry (emd_dir,filp,&entry);
if (ret < 0){
break;
}else if (entry.name_len > 0){
struct umsdos_info info;
ret = entry.name_len;
umsdos_parse (entry.name,entry.name_len,&info);
info.f_pos = f_pos;
umsdos_manglename(&info);
memcpy_tofs(&idata->umsdos_dirent,&entry
,sizeof(entry));
memcpy_tofs(&idata->dos_dirent.d_name
,info.fake.fname,info.fake.len+1);
break;
}
}
}
iput (emd_dir);
}else{
/* The absence of the EMD is simply seen as an EOF */
ret = 0;
}
}else if (cmd == UMSDOS_INIT_EMD){
/* #Specification: ioctl / UMSDOS_INIT_EMD
The UMSDOS_INIT_EMD command make sure the EMD
exist for a directory. If it does not, it is
created. Also, it makes sure the directory functions
table (struct inode_operations) is set to the UMSDOS
semantic. This mean that umssync may be applied to
an "opened" msdos directory, and it will change behavior
on the fly.
Return 0 if success.
*/
extern struct inode_operations umsdos_rdir_inode_operations;
struct inode *emd_dir = umsdos_emd_dir_lookup (dir,1);
ret = emd_dir != NULL;
iput (emd_dir);
dir->i_op = ret
? &umsdos_dir_inode_operations
: &umsdos_rdir_inode_operations;
}else{
struct umsdos_ioctl data;
memcpy_fromfs (&data,idata,sizeof(data));
if (cmd == UMSDOS_CREAT_EMD){
/* #Specification: ioctl / UMSDOS_CREAT_EMD
The umsdos_dirent field of the struct umsdos_ioctl is used
as is to create a new entry in the EMD of the directory.
The DOS directory is not modified.
No validation is done (yet).
Return 0 if success.
*/
struct umsdos_info info;
/* This makes sure info.entry and info in general is correctly */
/* initialised */
memcpy (&info.entry,&data.umsdos_dirent
,sizeof(data.umsdos_dirent));
umsdos_parse (data.umsdos_dirent.name
,data.umsdos_dirent.name_len,&info);
ret = umsdos_newentry (dir,&info);
}else if (cmd == UMSDOS_RENAME_DOS){
/* #Specification: ioctl / UMSDOS_RENAME_DOS
A file or directory is rename in a DOS directory
(not moved across directory). The source name
is in the dos_dirent.name field and the destination
is in umsdos_dirent.name field.
This ioctl allows umssync to rename a mangle file
name before syncing it back in the EMD.
*/
dir->i_count += 2;
ret = msdos_rename (dir
,data.dos_dirent.d_name,data.dos_dirent.d_reclen
,dir
,data.umsdos_dirent.name,data.umsdos_dirent.name_len);
}else if (cmd == UMSDOS_UNLINK_EMD){
/* #Specification: ioctl / UMSDOS_UNLINK_EMD
The umsdos_dirent field of the struct umsdos_ioctl is used
as is to remove an entry from the EMD of the directory.
No validation is done (yet). The mode field is used
to validate S_ISDIR or S_ISREG.
Return 0 if success.
*/
struct umsdos_info info;
/* This makes sure info.entry and info in general is correctly */
/* initialised */
memcpy (&info.entry,&data.umsdos_dirent
,sizeof(data.umsdos_dirent));
umsdos_parse (data.umsdos_dirent.name
,data.umsdos_dirent.name_len,&info);
ret = umsdos_delentry (dir,&info
,S_ISDIR(data.umsdos_dirent.mode));
}else if (cmd == UMSDOS_UNLINK_DOS){
/* #Specification: ioctl / UMSDOS_UNLINK_DOS
The dos_dirent field of the struct umsdos_ioctl is used to
execute a msdos_unlink operation. The d_name and d_reclen
fields are used.
Return 0 if success.
*/
dir->i_count++;
ret = msdos_unlink (dir,data.dos_dirent.d_name
,data.dos_dirent.d_reclen);
}else if (cmd == UMSDOS_RMDIR_DOS){
/* #Specification: ioctl / UMSDOS_RMDIR_DOS
The dos_dirent field of the struct umsdos_ioctl is used to
execute a msdos_unlink operation. The d_name and d_reclen
fields are used.
Return 0 if success.
*/
dir->i_count++;
ret = msdos_rmdir (dir,data.dos_dirent.d_name
,data.dos_dirent.d_reclen);
}else if (cmd == UMSDOS_STAT_DOS){
/* #Specification: ioctl / UMSDOS_STAT_DOS
The dos_dirent field of the struct umsdos_ioctl is
used to execute a stat operation in the DOS directory.
The d_name and d_reclen fields are used.
The following field of umsdos_ioctl.stat are filled.
st_ino,st_mode,st_size,st_atime,st_mtime,st_ctime,
Return 0 if success.
*/
struct inode *inode;
ret = umsdos_real_lookup (dir,data.dos_dirent.d_name
,data.dos_dirent.d_reclen,&inode);
if (ret == 0){
data.stat.st_ino = inode->i_ino;
data.stat.st_mode = inode->i_mode;
data.stat.st_size = inode->i_size;
data.stat.st_atime = inode->i_atime;
data.stat.st_ctime = inode->i_ctime;
data.stat.st_mtime = inode->i_mtime;
memcpy_tofs (&idata->stat,&data.stat,sizeof(data.stat));
iput (inode);
}
}else if (cmd == UMSDOS_DOS_SETUP){
/* #Specification: ioctl / UMSDOS_DOS_SETUP
The UMSDOS_DOS_SETUP ioctl allow changing the
default permission of the MsDOS file system driver
on the fly. The MsDOS driver apply global permission
to every file and directory. Normally these permissions
are controlled by a mount option. This is not
available for root partition, so a special utility
(umssetup) is provided to do this, normally in
/etc/rc.local.
Be aware that this apply ONLY to MsDOS directory
(those without EMD --linux-.---). Umsdos directory
have independent (standard) permission for each
and every file.
The field umsdos_dirent provide the information needed.
umsdos_dirent.uid and gid sets the owner and group.
umsdos_dirent.mode set the permissions flags.
*/
dir->i_sb->u.msdos_sb.fs_uid = data.umsdos_dirent.uid;
dir->i_sb->u.msdos_sb.fs_gid = data.umsdos_dirent.gid;
dir->i_sb->u.msdos_sb.fs_umask = data.umsdos_dirent.mode;
ret = 0;
}
}
}
PRINTK (("ioctl return %d\n",ret));
return ret;
}
static int umsdos_readdir_x (struct inode *dir, struct file *filp,
void *dirbuf, struct umsdos_dirent *u_entry,
filldir_t filldir)
{
struct dentry *demd;
off_t start_fpos;
int ret = 0;
loff_t pos;
umsdos_startlookup (dir);
if (filp->f_pos == UMSDOS_SPECIAL_DIRFPOS && dir == pseudo_root) {
/*
* We don't need to simulate this pseudo directory
* when umsdos_readdir_x is called for internal operation
* of umsdos. This is why dirent_in_fs is tested
*/
/* #Specification: pseudo root / directory /DOS
* When umsdos operates in pseudo root mode (C:\linux is the
* linux root), it simulate a directory /DOS which points to
* the real root of the file system.
*/
Printk ((KERN_WARNING "umsdos_readdir_x: pseudo_root thing UMSDOS_SPECIAL_DIRFPOS\n"));
if (filldir (dirbuf, "DOS", 3,
UMSDOS_SPECIAL_DIRFPOS, UMSDOS_ROOT_INO, DT_DIR) == 0) {
filp->f_pos++;
}
goto out_end;
}
if (filp->f_pos < 2 ||
(dir->i_ino != UMSDOS_ROOT_INO && filp->f_pos == 32)) {
int last_f_pos = filp->f_pos;
struct UMSDOS_DIR_ONCE bufk;
Printk (("umsdos_readdir_x: . or .. /mn/?\n"));
bufk.dirbuf = dirbuf;
bufk.filldir = filldir;
bufk.count = 0;
ret = fat_readdir (filp, &bufk, umsdos_dir_once);
if (last_f_pos > 0 && filp->f_pos > last_f_pos)
filp->f_pos = UMSDOS_SPECIAL_DIRFPOS;
if (u_entry != NULL)
u_entry->flags = 0;
goto out_end;
}
Printk (("umsdos_readdir_x: normal file /mn/?\n"));
/* get the EMD dentry */
demd = umsdos_get_emd_dentry(filp->f_dentry);
ret = PTR_ERR(demd);
if (IS_ERR(demd))
goto out_end;
ret = -EIO;
if (!demd->d_inode) {
printk(KERN_WARNING
"umsdos_readir_x: EMD file %s/%s not found\n",
demd->d_parent->d_name.name, demd->d_name.name);
goto out_dput;
}
pos = filp->f_pos;
start_fpos = filp->f_pos;
if (pos <= UMSDOS_SPECIAL_DIRFPOS + 1)
pos = 0;
ret = 0;
while (pos < demd->d_inode->i_size) {
off_t cur_f_pos = pos;
struct dentry *dret;
struct inode *inode;
struct umsdos_dirent entry;
struct umsdos_info info;
ret = -EIO;
if (umsdos_emd_dir_readentry (demd, &pos, &entry) != 0)
break;
if (entry.name_len == 0)
continue;
#ifdef UMSDOS_DEBUG_VERBOSE
if (entry.flags & UMSDOS_HLINK)
printk("umsdos_readdir_x: %s/%s is hardlink\n",
filp->f_dentry->d_name.name, entry.name);
#endif
umsdos_parse (entry.name, entry.name_len, &info);
info.f_pos = cur_f_pos;
umsdos_manglename (&info);
/*
* Do a real lookup on the short name.
*/
dret = umsdos_covered(filp->f_dentry, info.fake.fname,
info.fake.len);
ret = PTR_ERR(dret);
if (IS_ERR(dret))
break;
/*
* If the file wasn't found, remove it from the EMD.
*/
inode = dret->d_inode;
if (!inode)
goto remove_name;
#ifdef UMSDOS_DEBUG_VERBOSE
if (inode->u.umsdos_i.i_is_hlink)
printk("umsdos_readdir_x: %s/%s already resolved, ino=%ld\n",
dret->d_parent->d_name.name, dret->d_name.name, inode->i_ino);
#endif
Printk (("Found %s/%s, ino=%ld, flags=%x\n",
dret->d_parent->d_name.name, info.fake.fname, dret->d_inode->i_ino,
entry.flags));
/* check whether to resolve a hard-link */
if ((entry.flags & UMSDOS_HLINK) &&
!inode->u.umsdos_i.i_is_hlink) {
dret = umsdos_solve_hlink (dret);
ret = PTR_ERR(dret);
if (IS_ERR(dret))
break;
inode = dret->d_inode;
if (!inode) {
printk("umsdos_readdir_x: %s/%s negative after link\n",
dret->d_parent->d_name.name, dret->d_name.name);
goto clean_up;
}
}
/* #Specification: pseudo root / reading real root
* The pseudo root (/linux) is logically
* erased from the real root. This means that
* ls /DOS, won't show "linux". This avoids
* infinite recursion (/DOS/linux/DOS/linux/...) while
* walking the file system.
*/
if (inode != pseudo_root && !(entry.flags & UMSDOS_HIDDEN)) {
if (filldir (dirbuf, entry.name, entry.name_len,
cur_f_pos, inode->i_ino, DT_UNKNOWN) < 0) {
pos = cur_f_pos;
}
Printk(("umsdos_readdir_x: got %s/%s, ino=%ld\n",
dret->d_parent->d_name.name, dret->d_name.name, inode->i_ino));
if (u_entry != NULL)
*u_entry = entry;
dput(dret);
ret = 0;
break;
}
clean_up:
dput(dret);
continue;
remove_name:
/* #Specification: umsdos / readdir / not in MSDOS
* During a readdir operation, if the file is not
* in the MS-DOS directory any more, the entry is
* removed from the EMD file silently.
*/
#ifdef UMSDOS_PARANOIA
printk("umsdos_readdir_x: %s/%s out of sync, erasing\n",
filp->f_dentry->d_name.name, info.entry.name);
#endif
ret = umsdos_delentry(filp->f_dentry, &info,
S_ISDIR(info.entry.mode));
if (ret)
printk(KERN_WARNING
"umsdos_readdir_x: delentry %s, err=%d\n",
info.entry.name, ret);
goto clean_up;
}
/*
* If the fillbuf has failed, f_pos is back to 0.
* To avoid getting back into the . and .. state
* (see comments at the beginning), we put back
* the special offset.
*/
filp->f_pos = pos;
if (filp->f_pos == 0)
filp->f_pos = start_fpos;
out_dput:
dput(demd);
out_end:
umsdos_endlookup (dir);
Printk ((KERN_DEBUG "read dir %p pos %Ld ret %d\n",
dir, filp->f_pos, ret));
return ret;
}
/* #Specification: ioctl / prototypes
* The official prototype for the umsdos ioctl on directory
* is:
*
* int ioctl (
* int fd, // File handle of the directory
* int cmd, // command
* struct umsdos_ioctl *data)
*
* The struct and the commands are defined in linux/umsdos_fs.h.
*
* umsdos_progs/umsdosio.c provide an interface in C++ to all
* these ioctl. umsdos_progs/udosctl is a small utility showing
* all this.
*
* These ioctl generally allow one to work on the EMD or the
* DOS directory independently. These are essential to implement
* the synchronise.
*/
int UMSDOS_ioctl_dir(struct inode *dir, struct file *filp, unsigned int cmd,
unsigned long data_ptr)
{
struct dentry *dentry = filp->f_dentry;
struct umsdos_ioctl *idata = (struct umsdos_ioctl *) data_ptr;
int ret;
struct file new_filp;
struct umsdos_ioctl data;
Printk(("UMSDOS_ioctl_dir: %s/%s, cmd=%d, data=%08lx\n",
dentry->d_parent->d_name.name, dentry->d_name.name, cmd, data_ptr));
/* forward non-umsdos ioctls - this hopefully doesn't cause conflicts */
if (cmd != UMSDOS_GETVERSION
&& cmd != UMSDOS_READDIR_DOS
&& cmd != UMSDOS_READDIR_EMD
&& cmd != UMSDOS_INIT_EMD
&& cmd != UMSDOS_CREAT_EMD
&& cmd != UMSDOS_RENAME_DOS
&& cmd != UMSDOS_UNLINK_EMD
&& cmd != UMSDOS_UNLINK_DOS
&& cmd != UMSDOS_RMDIR_DOS
&& cmd != UMSDOS_STAT_DOS
&& cmd != UMSDOS_DOS_SETUP)
return fat_dir_ioctl (dir, filp, cmd, data_ptr);
/* #Specification: ioctl / acces
* Only root (effective id) is allowed to do IOCTL on directory
* in UMSDOS. EPERM is returned for other user.
*/
/*
* Well, not all cases require write access, but it simplifies
* the code, and let's face it, there is only one client (umssync)
* for all this.
*/
ret = verify_area (VERIFY_WRITE, (void *) data_ptr,
sizeof (struct umsdos_ioctl));
if (ret < 0)
goto out;
ret = -EPERM;
if (current->euid != 0 && cmd != UMSDOS_GETVERSION)
goto out;
ret = -EINVAL;
if (cmd == UMSDOS_GETVERSION) {
/* #Specification: ioctl / UMSDOS_GETVERSION
* The field version and release of the structure
* umsdos_ioctl are filled with the version and release
* number of the fs code in the kernel. This will allow
* some form of checking. Users won't be able to run
* incompatible utility such as the synchroniser (umssync).
* umsdos_progs/umsdosio.c enforce this checking.
*
* Return always 0.
*/
put_user (UMSDOS_VERSION, &idata->version);
put_user (UMSDOS_RELEASE, &idata->release);
ret = 0;
goto out;
}
if (cmd == UMSDOS_READDIR_DOS) {
/* #Specification: ioctl / UMSDOS_READDIR_DOS
* One entry is read from the DOS directory at the current
* file position. The entry is put as is in the dos_dirent
* field of struct umsdos_ioctl.
*
* Return > 0 if success.
*/
struct UMSDOS_DIR_ONCE bufk;
bufk.count = 0;
bufk.ent = &idata->dos_dirent;
fat_readdir (filp, &bufk, umsdos_ioctl_fill);
ret = bufk.count == 1 ? 1 : 0;
goto out;
}
if (cmd == UMSDOS_READDIR_EMD) {
/* #Specification: ioctl / UMSDOS_READDIR_EMD
* One entry is read from the EMD at the current
* file position. The entry is put as is in the umsdos_dirent
* field of struct umsdos_ioctl. The corresponding mangled
* DOS entry name is put in the dos_dirent field.
*
* All entries are read including hidden links. Blank
* entries are skipped.
*
* Return > 0 if success.
*/
struct dentry *demd;
/* The absence of the EMD is simply seen as an EOF */
demd = umsdos_get_emd_dentry(dentry);
ret = PTR_ERR(demd);
if (IS_ERR(demd))
goto out;
ret = 0;
if (!demd->d_inode)
goto read_dput;
fill_new_filp(&new_filp, demd);
new_filp.f_pos = filp->f_pos;
while (new_filp.f_pos < demd->d_inode->i_size) {
off_t f_pos = new_filp.f_pos;
struct umsdos_dirent entry;
struct umsdos_info info;
ret = umsdos_emd_dir_readentry (&new_filp, &entry);
if (ret)
break;
if (entry.name_len <= 0)
continue;
umsdos_parse (entry.name, entry.name_len, &info);
info.f_pos = f_pos;
umsdos_manglename (&info);
ret = -EFAULT;
if (copy_to_user (&idata->umsdos_dirent, &entry,
sizeof (entry)))
break;
if (copy_to_user (&idata->dos_dirent.d_name,
info.fake.fname,
info.fake.len + 1))
break;
ret = entry.name_len;
break;
}
/* update the original f_pos */
filp->f_pos = new_filp.f_pos;
read_dput:
d_drop(demd);
dput(demd);
goto out;
}
if (cmd == UMSDOS_INIT_EMD) {
/* #Specification: ioctl / UMSDOS_INIT_EMD
* The UMSDOS_INIT_EMD command makes sure the EMD
* exists for a directory. If it does not, it is
* created. Also, it makes sure the directory function
* table (struct inode_operations) is set to the UMSDOS
* semantic. This mean that umssync may be applied to
* an "opened" msdos directory, and it will change behavior
* on the fly.
*
* Return 0 if success.
*/
extern struct inode_operations umsdos_rdir_inode_operations;
ret = umsdos_make_emd(dentry);
Printk(("UMSDOS_ioctl_dir: INIT_EMD %s/%s, ret=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, ret));
dir->i_op = (ret == 0)
? &umsdos_dir_inode_operations
: &umsdos_rdir_inode_operations;
goto out;
}
ret = -EFAULT;
if (copy_from_user (&data, idata, sizeof (data)))
goto out;
if (cmd == UMSDOS_CREAT_EMD) {
/* #Specification: ioctl / UMSDOS_CREAT_EMD
* The umsdos_dirent field of the struct umsdos_ioctl is used
* as is to create a new entry in the EMD of the directory.
* The DOS directory is not modified.
* No validation is done (yet).
*
* Return 0 if success.
*/
struct umsdos_info info;
/* This makes sure info.entry and info in general
* is correctly initialised
*/
memcpy (&info.entry, &data.umsdos_dirent,
sizeof (data.umsdos_dirent));
umsdos_parse (data.umsdos_dirent.name
,data.umsdos_dirent.name_len, &info);
ret = umsdos_newentry (dentry, &info);
goto out;
}
else if (cmd == UMSDOS_RENAME_DOS) {
struct dentry *old_dentry, *new_dentry; /* FIXME */
/* #Specification: ioctl / UMSDOS_RENAME_DOS
* A file or directory is renamed in a DOS directory
* (not moved across directory). The source name
* is in the dos_dirent.name field and the destination
* is in umsdos_dirent.name field.
*
* This ioctl allows umssync to rename a mangled file
* name before syncing it back in the EMD.
*/
old_dentry = umsdos_lookup_dentry (dentry,
data.dos_dirent.d_name,
data.dos_dirent.d_reclen ,1);
ret = PTR_ERR(old_dentry);
if (IS_ERR(old_dentry))
goto out;
new_dentry = umsdos_lookup_dentry (dentry,
data.umsdos_dirent.name,
data.umsdos_dirent.name_len, 1);
ret = PTR_ERR(new_dentry);
if (!IS_ERR(new_dentry)) {
printk("umsdos_ioctl: renaming %s/%s to %s/%s\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name);
ret = msdos_rename (dir, old_dentry, dir, new_dentry);
dput(new_dentry);
}
dput(old_dentry);
goto out;
}
else if (cmd == UMSDOS_UNLINK_EMD) {
/* #Specification: ioctl / UMSDOS_UNLINK_EMD
* The umsdos_dirent field of the struct umsdos_ioctl is used
* as is to remove an entry from the EMD of the directory.
* No validation is done (yet). The mode field is used
* to validate S_ISDIR or S_ISREG.
*
* Return 0 if success.
*/
struct umsdos_info info;
/* This makes sure info.entry and info in general
* is correctly initialised
*/
memcpy (&info.entry, &data.umsdos_dirent,
sizeof (data.umsdos_dirent));
umsdos_parse (data.umsdos_dirent.name,
data.umsdos_dirent.name_len, &info);
ret = umsdos_delentry (dentry, &info,
S_ISDIR (data.umsdos_dirent.mode));
if (ret) {
printk(KERN_WARNING
"umsdos_ioctl: delentry %s/%s failed, ret=%d\n",
dentry->d_name.name, info.entry.name, ret);
}
goto out;
}
else if (cmd == UMSDOS_UNLINK_DOS) {
struct dentry *temp;
/* #Specification: ioctl / UMSDOS_UNLINK_DOS
* The dos_dirent field of the struct umsdos_ioctl is used to
* execute a msdos_unlink operation. The d_name and d_reclen
* fields are used.
*
* Return 0 if success.
*/
temp = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name,
data.dos_dirent.d_reclen, 1);
ret = PTR_ERR(temp);
if (IS_ERR(temp))
goto out;
ret = -ENOENT;
if (temp->d_inode) {
ret = -EISDIR;
if (!S_ISDIR(temp->d_inode->i_mode))
ret = msdos_unlink (dir, temp);
}
dput (temp);
goto out;
}
else if (cmd == UMSDOS_RMDIR_DOS) {
struct dentry *temp;
/* #Specification: ioctl / UMSDOS_RMDIR_DOS
* The dos_dirent field of the struct umsdos_ioctl is used to
* execute a msdos_rmdir operation. The d_name and d_reclen
* fields are used.
*
* Return 0 if success.
*/
temp = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name,
data.dos_dirent.d_reclen, 1);
ret = PTR_ERR(temp);
if (IS_ERR(temp))
goto out;
ret = -ENOENT;
if (temp->d_inode) {
ret = -ENOTDIR;
if (S_ISDIR(temp->d_inode->i_mode))
ret = msdos_rmdir (dir, temp);
}
dput (temp);
goto out;
} else if (cmd == UMSDOS_STAT_DOS) {
/* #Specification: ioctl / UMSDOS_STAT_DOS
* The dos_dirent field of the struct umsdos_ioctl is
* used to execute a stat operation in the DOS directory.
* The d_name and d_reclen fields are used.
*
* The following field of umsdos_ioctl.stat are filled.
*
* st_ino,st_mode,st_size,st_atime,st_mtime,st_ctime,
* Return 0 if success.
*/
struct dentry *dret;
struct inode *inode;
dret = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name,
data.dos_dirent.d_reclen, 1);
ret = PTR_ERR(dret);
if (IS_ERR(dret))
goto out;
ret = -ENOENT;
inode = dret->d_inode;
if (inode) {
data.stat.st_ino = inode->i_ino;
data.stat.st_mode = inode->i_mode;
data.stat.st_size = inode->i_size;
data.stat.st_atime = inode->i_atime;
data.stat.st_ctime = inode->i_ctime;
data.stat.st_mtime = inode->i_mtime;
ret = -EFAULT;
if (!copy_to_user (&idata->stat, &data.stat,
sizeof (data.stat)))
ret = 0;
}
dput(dret);
goto out;
}
else if (cmd == UMSDOS_DOS_SETUP) {
/* #Specification: ioctl / UMSDOS_DOS_SETUP
* The UMSDOS_DOS_SETUP ioctl allow changing the
* default permission of the MS-DOS filesystem driver
* on the fly. The MS-DOS driver applies global permissions
* to every file and directory. Normally these permissions
* are controlled by a mount option. This is not
* available for root partition, so a special utility
* (umssetup) is provided to do this, normally in
* /etc/rc.local.
*
* Be aware that this applies ONLY to MS-DOS directories
* (those without EMD --linux-.---). Umsdos directory
* have independent (standard) permission for each
* and every file.
*
* The field umsdos_dirent provide the information needed.
* umsdos_dirent.uid and gid sets the owner and group.
* umsdos_dirent.mode set the permissions flags.
*/
dir->i_sb->u.msdos_sb.options.fs_uid = data.umsdos_dirent.uid;
dir->i_sb->u.msdos_sb.options.fs_gid = data.umsdos_dirent.gid;
dir->i_sb->u.msdos_sb.options.fs_umask = data.umsdos_dirent.mode;
ret = 0;
}
out:
Printk (("ioctl %d, returning %d\n", cmd, ret));
return ret;
}
struct dentry *umsdos_lookup_x (struct inode *dir, struct dentry *dentry, int nopseudo)
{
struct dentry *dret = NULL;
struct inode *inode;
int ret = -ENOENT;
struct umsdos_info info;
#ifdef UMSDOS_DEBUG_VERBOSE
printk("umsdos_lookup_x: looking for %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
umsdos_startlookup (dir);
if (umsdos_is_pseudodos (dir, dentry)) {
/* #Specification: pseudo root / lookup(DOS)
* A lookup of DOS in the pseudo root will always succeed
* and return the inode of the real root.
*/
Printk ((KERN_DEBUG "umsdos_lookup_x: following /DOS\n"));
inode = saved_root->d_inode;
goto out_add;
}
ret = umsdos_parse (dentry->d_name.name, dentry->d_name.len, &info);
if (ret) {
printk("umsdos_lookup_x: %s/%s parse failed, ret=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, ret);
goto out;
}
ret = umsdos_findentry (dentry->d_parent, &info, 0);
if (ret) {
if (ret != -ENOENT)
printk("umsdos_lookup_x: %s/%s findentry failed, ret=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, ret);
goto out;
}
Printk (("lookup %.*s pos %lu ret %d len %d ",
info.fake.len, info.fake.fname, info.f_pos, ret, info.fake.len));
/* do a real lookup to get the short name ... */
dret = umsdos_covered(dentry->d_parent, info.fake.fname, info.fake.len);
ret = PTR_ERR(dret);
if (IS_ERR(dret)) {
printk("umsdos_lookup_x: %s/%s real lookup failed, ret=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, ret);
goto out;
}
inode = dret->d_inode;
if (!inode)
goto out_remove;
umsdos_lookup_patch_new(dret, &info);
#ifdef UMSDOS_DEBUG_VERBOSE
printk("umsdos_lookup_x: found %s/%s, ino=%ld\n",
dret->d_parent->d_name.name, dret->d_name.name, dret->d_inode->i_ino);
#endif
/* Check for a hard link */
if ((info.entry.flags & UMSDOS_HLINK) &&
!inode->u.umsdos_i.i_is_hlink) {
dret = umsdos_solve_hlink (dret);
ret = PTR_ERR(dret);
if (IS_ERR(dret))
goto out;
ret = -ENOENT;
inode = dret->d_inode;
if (!inode) {
printk("umsdos_lookup_x: %s/%s negative after link\n",
dret->d_parent->d_name.name, dret->d_name.name);
goto out_dput;
}
}
if (inode == pseudo_root && !nopseudo) {
/* #Specification: pseudo root / dir lookup
* For the same reason as readdir, a lookup in /DOS for
* the pseudo root directory (linux) will fail.
*/
/*
* This has to be allowed for resolving hard links
* which are recorded independently of the pseudo-root
* mode.
*/
printk("umsdos_lookup_x: skipping DOS/linux\n");
ret = -ENOENT;
goto out_dput;
}
/*
* We've found it OK. Now hash the dentry with the inode.
*/
out_add:
atomic_inc(&inode->i_count);
d_add (dentry, inode);
dentry->d_op = &umsdos_dentry_operations;
ret = 0;
out_dput:
if (dret && dret != dentry)
d_drop(dret);
dput(dret);
out:
umsdos_endlookup (dir);
return ERR_PTR(ret);
out_remove:
printk(KERN_WARNING "UMSDOS: entry %s/%s out of sync, erased\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
umsdos_delentry (dentry->d_parent, &info, S_ISDIR (info.entry.mode));
ret = -ENOENT;
goto out_dput;
}
