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1628 |
jcastillo |
/*
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* linux/fs/umsdos/ioctl.c
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*
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* Written 1993 by Jacques Gelinas
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*
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* Extended MS-DOS ioctl directory handling functions
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*/
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#include <asm/segment.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/msdos_fs.h>
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#include <linux/umsdos_fs.h>
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#define PRINTK(x)
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#define Printk(x) printk x
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struct UMSDOS_DIR_ONCE {
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struct dirent *ent;
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int count;
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};
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/*
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Record a single entry the first call.
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Return -EINVAL the next one.
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*/
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static int umsdos_ioctl_fill(
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void * buf,
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const char * name,
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int name_len,
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off_t offset,
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ino_t ino)
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{
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int ret = -EINVAL;
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struct UMSDOS_DIR_ONCE *d = (struct UMSDOS_DIR_ONCE *)buf;
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if (d->count == 0){
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memcpy_tofs (d->ent->d_name,name,name_len);
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put_user ('\0',d->ent->d_name+name_len);
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put_user (name_len,&d->ent->d_reclen);
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put_user (ino,&d->ent->d_ino);
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put_user (offset,&d->ent->d_off);
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d->count = 1;
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ret = 0;
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}
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return ret;
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}
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/*
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Perform special function on a directory
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*/
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int UMSDOS_ioctl_dir (
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struct inode *dir,
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struct file *filp,
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unsigned int cmd,
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unsigned long data)
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{
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int ret = -EPERM;
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int err;
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/* #Specification: ioctl / acces
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Only root (effective id) is allowed to do IOCTL on directory
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in UMSDOS. EPERM is returned for other user.
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*/
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/*
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Well, not all cases require write access, but it simplifies
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the code, and let's face it, there is only one client (umssync)
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for all this.
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*/
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if ((err = verify_area(VERIFY_WRITE,(void*)data,sizeof(struct umsdos_ioctl))) < 0) {
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ret = err;
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}else if (current->euid == 0
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|| cmd == UMSDOS_GETVERSION){
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struct umsdos_ioctl *idata = (struct umsdos_ioctl *)data;
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ret = -EINVAL;
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/* #Specification: ioctl / prototypes
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The official prototype for the umsdos ioctl on directory
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is:
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int ioctl (
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int fd, // File handle of the directory
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int cmd, // command
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struct umsdos_ioctl *data)
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The struct and the commands are defined in linux/umsdos_fs.h.
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umsdos_progs/umsdosio.c provide an interface in C++ to all
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these ioctl. umsdos_progs/udosctl is a small utility showing
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all this.
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These ioctl generally allow one to work on the EMD or the
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DOS directory independently. These are essential to implement
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the synchronise.
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*/
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PRINTK (("ioctl %d ",cmd));
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if (cmd == UMSDOS_GETVERSION){
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/* #Specification: ioctl / UMSDOS_GETVERSION
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The field version and release of the structure
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umsdos_ioctl are filled with the version and release
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number of the fs code in the kernel. This will allow
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some form of checking. Users won't be able to run
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incompatible utility such as the synchroniser (umssync).
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umsdos_progs/umsdosio.c enforce this checking.
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Return always 0.
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*/
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put_fs_byte (UMSDOS_VERSION,&idata->version);
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put_fs_byte (UMSDOS_RELEASE,&idata->release);
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ret = 0;
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}else if (cmd == UMSDOS_READDIR_DOS){
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/* #Specification: ioctl / UMSDOS_READDIR_DOS
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One entry is read from the DOS directory at the current
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file position. The entry is put as is in the dos_dirent
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field of struct umsdos_ioctl.
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Return > 0 if success.
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*/
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struct UMSDOS_DIR_ONCE bufk;
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bufk.count = 0;
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bufk.ent = &idata->dos_dirent;
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fat_readdir(dir,filp,&bufk,umsdos_ioctl_fill);
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ret = bufk.count == 1 ? 1 : 0;
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}else if (cmd == UMSDOS_READDIR_EMD){
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/* #Specification: ioctl / UMSDOS_READDIR_EMD
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One entry is read from the EMD at the current
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file position. The entry is put as is in the umsdos_dirent
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field of struct umsdos_ioctl. The corresponding mangled
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DOS entry name is put in the dos_dirent field.
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All entries are read including hidden links. Blank
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entries are skipped.
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Return > 0 if success.
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*/
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struct inode *emd_dir = umsdos_emd_dir_lookup (dir,0);
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if (emd_dir != NULL){
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while (1){
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if (filp->f_pos >= emd_dir->i_size){
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ret = 0;
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break;
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}else{
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struct umsdos_dirent entry;
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off_t f_pos = filp->f_pos;
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ret = umsdos_emd_dir_readentry (emd_dir,filp,&entry);
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if (ret < 0){
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break;
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}else if (entry.name_len > 0){
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struct umsdos_info info;
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ret = entry.name_len;
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umsdos_parse (entry.name,entry.name_len,&info);
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info.f_pos = f_pos;
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umsdos_manglename(&info);
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memcpy_tofs(&idata->umsdos_dirent,&entry
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,sizeof(entry));
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memcpy_tofs(&idata->dos_dirent.d_name
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,info.fake.fname,info.fake.len+1);
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break;
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}
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}
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}
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iput (emd_dir);
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}else{
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/* The absence of the EMD is simply seen as an EOF */
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ret = 0;
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}
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}else if (cmd == UMSDOS_INIT_EMD){
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/* #Specification: ioctl / UMSDOS_INIT_EMD
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The UMSDOS_INIT_EMD command make sure the EMD
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exist for a directory. If it does not, it is
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created. Also, it makes sure the directory functions
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table (struct inode_operations) is set to the UMSDOS
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semantic. This mean that umssync may be applied to
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an "opened" msdos directory, and it will change behavior
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on the fly.
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Return 0 if success.
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*/
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extern struct inode_operations umsdos_rdir_inode_operations;
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struct inode *emd_dir = umsdos_emd_dir_lookup (dir,1);
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ret = emd_dir != NULL;
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iput (emd_dir);
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dir->i_op = ret
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? &umsdos_dir_inode_operations
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: &umsdos_rdir_inode_operations;
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}else{
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struct umsdos_ioctl data;
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memcpy_fromfs (&data,idata,sizeof(data));
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if (cmd == UMSDOS_CREAT_EMD){
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/* #Specification: ioctl / UMSDOS_CREAT_EMD
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The umsdos_dirent field of the struct umsdos_ioctl is used
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as is to create a new entry in the EMD of the directory.
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The DOS directory is not modified.
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No validation is done (yet).
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| 198 |
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Return 0 if success.
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| 199 |
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*/
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| 200 |
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struct umsdos_info info;
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| 201 |
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/* This makes sure info.entry and info in general is correctly */
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| 202 |
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/* initialised */
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| 203 |
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memcpy (&info.entry,&data.umsdos_dirent
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| 204 |
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,sizeof(data.umsdos_dirent));
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| 205 |
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umsdos_parse (data.umsdos_dirent.name
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| 206 |
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,data.umsdos_dirent.name_len,&info);
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| 207 |
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ret = umsdos_newentry (dir,&info);
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| 208 |
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}else if (cmd == UMSDOS_RENAME_DOS){
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| 209 |
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/* #Specification: ioctl / UMSDOS_RENAME_DOS
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| 210 |
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A file or directory is rename in a DOS directory
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| 211 |
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(not moved across directory). The source name
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| 212 |
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is in the dos_dirent.name field and the destination
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| 213 |
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is in umsdos_dirent.name field.
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| 214 |
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| 215 |
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This ioctl allows umssync to rename a mangle file
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| 216 |
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name before syncing it back in the EMD.
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| 217 |
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*/
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| 218 |
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dir->i_count += 2;
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| 219 |
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ret = msdos_rename (dir
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| 220 |
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,data.dos_dirent.d_name,data.dos_dirent.d_reclen
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| 221 |
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,dir
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| 222 |
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,data.umsdos_dirent.name,data.umsdos_dirent.name_len,0);
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| 223 |
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}else if (cmd == UMSDOS_UNLINK_EMD){
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| 224 |
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/* #Specification: ioctl / UMSDOS_UNLINK_EMD
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| 225 |
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The umsdos_dirent field of the struct umsdos_ioctl is used
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| 226 |
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as is to remove an entry from the EMD of the directory.
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| 227 |
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No validation is done (yet). The mode field is used
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| 228 |
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to validate S_ISDIR or S_ISREG.
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| 229 |
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| 230 |
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Return 0 if success.
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| 231 |
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*/
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| 232 |
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struct umsdos_info info;
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| 233 |
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/* This makes sure info.entry and info in general is correctly */
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| 234 |
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/* initialised */
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| 235 |
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memcpy (&info.entry,&data.umsdos_dirent
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| 236 |
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,sizeof(data.umsdos_dirent));
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| 237 |
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umsdos_parse (data.umsdos_dirent.name
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| 238 |
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,data.umsdos_dirent.name_len,&info);
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| 239 |
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ret = umsdos_delentry (dir,&info
|
| 240 |
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,S_ISDIR(data.umsdos_dirent.mode));
|
| 241 |
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}else if (cmd == UMSDOS_UNLINK_DOS){
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| 242 |
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/* #Specification: ioctl / UMSDOS_UNLINK_DOS
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| 243 |
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The dos_dirent field of the struct umsdos_ioctl is used to
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| 244 |
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execute a msdos_unlink operation. The d_name and d_reclen
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| 245 |
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fields are used.
|
| 246 |
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|
| 247 |
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Return 0 if success.
|
| 248 |
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*/
|
| 249 |
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dir->i_count++;
|
| 250 |
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ret = msdos_unlink (dir,data.dos_dirent.d_name
|
| 251 |
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,data.dos_dirent.d_reclen);
|
| 252 |
|
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}else if (cmd == UMSDOS_RMDIR_DOS){
|
| 253 |
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/* #Specification: ioctl / UMSDOS_RMDIR_DOS
|
| 254 |
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The dos_dirent field of the struct umsdos_ioctl is used to
|
| 255 |
|
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execute a msdos_unlink operation. The d_name and d_reclen
|
| 256 |
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fields are used.
|
| 257 |
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|
| 258 |
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Return 0 if success.
|
| 259 |
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*/
|
| 260 |
|
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dir->i_count++;
|
| 261 |
|
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ret = msdos_rmdir (dir,data.dos_dirent.d_name
|
| 262 |
|
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,data.dos_dirent.d_reclen);
|
| 263 |
|
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}else if (cmd == UMSDOS_STAT_DOS){
|
| 264 |
|
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/* #Specification: ioctl / UMSDOS_STAT_DOS
|
| 265 |
|
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The dos_dirent field of the struct umsdos_ioctl is
|
| 266 |
|
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used to execute a stat operation in the DOS directory.
|
| 267 |
|
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The d_name and d_reclen fields are used.
|
| 268 |
|
|
|
| 269 |
|
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The following field of umsdos_ioctl.stat are filled.
|
| 270 |
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|
|
| 271 |
|
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st_ino,st_mode,st_size,st_atime,st_mtime,st_ctime,
|
| 272 |
|
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Return 0 if success.
|
| 273 |
|
|
*/
|
| 274 |
|
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struct inode *inode;
|
| 275 |
|
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ret = umsdos_real_lookup (dir,data.dos_dirent.d_name
|
| 276 |
|
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,data.dos_dirent.d_reclen,&inode);
|
| 277 |
|
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if (ret == 0){
|
| 278 |
|
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data.stat.st_ino = inode->i_ino;
|
| 279 |
|
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data.stat.st_mode = inode->i_mode;
|
| 280 |
|
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data.stat.st_size = inode->i_size;
|
| 281 |
|
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data.stat.st_atime = inode->i_atime;
|
| 282 |
|
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data.stat.st_ctime = inode->i_ctime;
|
| 283 |
|
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data.stat.st_mtime = inode->i_mtime;
|
| 284 |
|
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memcpy_tofs (&idata->stat,&data.stat,sizeof(data.stat));
|
| 285 |
|
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iput (inode);
|
| 286 |
|
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}
|
| 287 |
|
|
}else if (cmd == UMSDOS_DOS_SETUP){
|
| 288 |
|
|
/* #Specification: ioctl / UMSDOS_DOS_SETUP
|
| 289 |
|
|
The UMSDOS_DOS_SETUP ioctl allow changing the
|
| 290 |
|
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default permission of the MsDOS file system driver
|
| 291 |
|
|
on the fly. The MsDOS driver apply global permission
|
| 292 |
|
|
to every file and directory. Normally these permissions
|
| 293 |
|
|
are controlled by a mount option. This is not
|
| 294 |
|
|
available for root partition, so a special utility
|
| 295 |
|
|
(umssetup) is provided to do this, normally in
|
| 296 |
|
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/etc/rc.local.
|
| 297 |
|
|
|
| 298 |
|
|
Be aware that this apply ONLY to MsDOS directory
|
| 299 |
|
|
(those without EMD --linux-.---). Umsdos directory
|
| 300 |
|
|
have independent (standard) permission for each
|
| 301 |
|
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and every file.
|
| 302 |
|
|
|
| 303 |
|
|
The field umsdos_dirent provide the information needed.
|
| 304 |
|
|
umsdos_dirent.uid and gid sets the owner and group.
|
| 305 |
|
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umsdos_dirent.mode set the permissions flags.
|
| 306 |
|
|
*/
|
| 307 |
|
|
dir->i_sb->u.msdos_sb.options.fs_uid = data.umsdos_dirent.uid;
|
| 308 |
|
|
dir->i_sb->u.msdos_sb.options.fs_gid = data.umsdos_dirent.gid;
|
| 309 |
|
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dir->i_sb->u.msdos_sb.options.fs_umask = data.umsdos_dirent.mode;
|
| 310 |
|
|
ret = 0;
|
| 311 |
|
|
}
|
| 312 |
|
|
}
|
| 313 |
|
|
}
|
| 314 |
|
|
PRINTK (("ioctl return %d\n",ret));
|
| 315 |
|
|
return ret;
|
| 316 |
|
|
}
|
| 317 |
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|
| 318 |
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| 319 |
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|
