int blkdev_release(struct inode * inode)
{
struct file_operations *fops = get_blkfops(MAJOR(inode->i_rdev));
if (fops && fops->release)
return fops->release(inode,NULL);
return 0;
}
static void putdev(struct inode * inode)
{
struct file_operations * fops;
fops = get_blkfops(MAJOR(inode->i_rdev));
if (fops->release)
fops->release(inode, NULL);
}
int sys_umount(char *name)
{
struct inode *inode;
register struct inode *inodep;
kdev_t dev;
int retval;
struct inode dummy_inode;
if (!suser())
return -EPERM;
retval = namei(name, &inode, 0, 0);
if (retval) {
retval = lnamei(name, &inode);
if (retval)
return retval;
}
inodep = inode;
if (S_ISBLK(inodep->i_mode)) {
dev = inodep->i_rdev;
if (IS_NODEV(inodep)) {
iput(inodep);
return -EACCES;
}
} else {
register struct super_block *sb = inodep->i_sb;
if (!sb || inodep != sb->s_mounted) {
iput(inodep);
return -EINVAL;
}
dev = sb->s_dev;
iput(inodep);
memset(&dummy_inode, 0, sizeof(dummy_inode));
dummy_inode.i_rdev = dev;
inodep = &dummy_inode;
}
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inodep);
return -ENXIO;
}
if (!(retval = do_umount(dev)) && dev != ROOT_DEV) {
register struct file_operations *fops;
fops = get_blkfops(MAJOR(dev));
if (fops && fops->release)
fops->release(inodep, NULL);
#ifdef NOT_YET
if (MAJOR(dev) == UNNAMED_MAJOR)
put_unnamed_dev(dev);
#endif
}
if (inodep != &dummy_inode)
iput(inodep);
if (retval)
return retval;
fsync_dev(dev);
return 0;
}
/*
* Called every time a block special file is opened
*/
int blkdev_open(struct inode * inode, struct file * filp)
{
int ret = -ENODEV;
filp->f_op = get_blkfops(MAJOR(inode->i_rdev));
if (filp->f_op != NULL){
ret = 0;
if (filp->f_op->open != NULL)
ret = filp->f_op->open(inode,filp);
}
return ret;
}
long sys_umount(const char *name, size_t name_len)
{
struct inode * inode;
dev_t dev;
int retval, error;
struct inode dummy_inode;
struct file_operations * fops;
error = verify_user_string(name, name_len);
if (error)
return error;
//if (!suser())
// return -EPERM;
retval = namei(name,&inode);
if (retval) {
retval = lnamei(name,&inode);
if (retval)
return retval;
}
if (S_ISBLK(inode->i_mode)) {
dev = inode->i_rdev;
if (IS_NODEV(inode)) {
iput(inode);
return -EACCES;
}
} else {
if (!inode || !inode->i_sb || inode != inode->i_sb->s_mounted) {
iput(inode);
return -EINVAL;
}
dev = inode->i_sb->s_dev;
iput(inode);
memset(&dummy_inode, 0, sizeof(dummy_inode));
dummy_inode.i_dev = dev;
inode = &dummy_inode;
}
if (major(dev) >= MAX_BLKDEV) {
iput(inode);
return -ENXIO;
}
if (!(retval = do_umount(dev)) && dev != ROOT_DEV) {
fops = get_blkfops(major(dev));
if (fops && fops->release)
fops->release(inode,NULL);
if (major(dev) == UNNAMED_MAJOR)
put_unnamed_dev(dev);
}
if (inode != &dummy_inode)
iput(inode);
if (retval)
return retval;
//fsync_dev(dev);
return 0;
}
static unsigned int isofs_get_last_session(kdev_t dev)
{
struct cdrom_multisession ms_info;
unsigned int vol_desc_start;
struct inode inode_fake;
extern struct file_operations * get_blkfops(unsigned int);
int i;
vol_desc_start=0;
if (get_blkfops(MAJOR(dev))->ioctl!=NULL)
{
/* Whoops. We must save the old FS, since otherwise
* we would destroy the kernels idea about FS on root
* mount in read_super... [chexum]
*/
unsigned long old_fs=get_fs();
inode_fake.i_rdev=dev;
ms_info.addr_format=CDROM_LBA;
set_fs(KERNEL_DS);
i=get_blkfops(MAJOR(dev))->ioctl(&inode_fake,
NULL,
CDROMMULTISESSION,
(unsigned long) &ms_info);
set_fs(old_fs);
#if 0
printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
if (i==0)
{
printk("isofs.inode: XA disk: %s\n", ms_info.xa_flag ? "yes":"no");
printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
}
#endif 0
if (i==0)
#if WE_OBEY_THE_WRITTEN_STANDARDS
if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
#endif WE_OBEY_THE_WRITTEN_STANDARDS
vol_desc_start=ms_info.addr.lba;
}
return vol_desc_start;
}
/*
* Called every time a block special file is opened
*/
int blkdev_open(struct inode * inode, struct file * filp)
{
int ret = -ENODEV;
if (securelevel > 0 && (filp->f_mode & FMODE_WRITE))
return -EACCES; /* cevans */
filp->f_op = get_blkfops(MAJOR(inode->i_rdev));
if (filp->f_op != NULL){
ret = 0;
if (filp->f_op->open != NULL)
ret = filp->f_op->open(inode,filp);
}
return ret;
}
static long unpacked_mount(const char *dev_name, const char *dir_name,
const char *type, unsigned long flags, const void *data)
{
struct file_system_type *fstype;
struct inode *inode;
struct file_operations *fops;
dev_t dev;
int error;
if (flags & MS_REMOUNT) {
return do_remount(dir_name, flags, data);
}
flags &= MS_MOUNT_MASK;
if (!type || !(fstype = get_fs_type(type)))
return -ENODEV;
if (fstype->requires_dev) {
if (!dev_name)
return -ENOTBLK;
error = namei(dev_name, &inode);
if (error)
return error;
if (!S_ISBLK(inode->i_mode))
return -ENOTBLK;
dev = inode->i_rdev;
} else {
if (!(dev = get_unnamed_dev()))
return -EMFILE;
inode = NULL;
}
fops = get_blkfops(major(dev));
if (fops && fops->open) {
if ((error = fops->open(inode, NULL))) {
iput(inode);
return error;
}
}
error = do_mount(dev, dir_name, type, flags, NULL);
if (error && fops && fops->release)
fops->release(inode, NULL);
iput(inode);
return error;
}
static int getdev(const char * name, int rdonly, struct inode ** ino)
{
kdev_t dev;
struct inode * inode;
struct file_operations * fops;
int retval;
retval = namei(name, &inode);
if (retval)
return retval;
if (!S_ISBLK(inode->i_mode)) {
iput(inode);
return -ENOTBLK;
}
if (IS_NODEV(inode)) {
iput(inode);
return -EACCES;
}
dev = inode->i_rdev;
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inode);
return -ENXIO;
}
fops = get_blkfops(MAJOR(dev));
if (!fops) {
iput(inode);
return -ENODEV;
}
if (fops->open) {
struct file dummy;
memset(&dummy, 0, sizeof(dummy));
dummy.f_inode = inode;
dummy.f_mode = rdonly ? 1 : 3;
retval = fops->open(inode, &dummy);
if (retval) {
iput(inode);
return retval;
}
}
*ino = inode;
return 0;
}
/*
* Flags is a 16-bit value that allows up to 16 non-fs dependent flags to
* be given to the mount() call (ie: read-only, no-dev, no-suid etc).
*
* data is a (void *) that can point to any structure up to
* PAGE_SIZE-1 bytes, which can contain arbitrary fs-dependent
* information (or be NULL).
*
* NOTE! As old versions of mount() didn't use this setup, the flags
* has to have a special 16-bit magic number in the hight word:
* 0xC0ED. If this magic word isn't present, the flags and data info
* isn't used, as the syscall assumes we are talking to an older
* version that didn't understand them.
*/
asmlinkage int sys_mount(char * dev_name, char * dir_name, char * type,
unsigned long new_flags, void * data)
{
struct file_system_type * fstype;
struct inode * inode;
struct file_operations * fops;
kdev_t dev;
int retval;
const char * t;
unsigned long flags = 0;
unsigned long page = 0;
if (!suser())
return -EPERM;
if ((new_flags &
(MS_MGC_MSK | MS_REMOUNT)) == (MS_MGC_VAL | MS_REMOUNT)) {
retval = copy_mount_options (data, &page);
if (retval < 0)
return retval;
retval = do_remount(dir_name,
new_flags & ~MS_MGC_MSK & ~MS_REMOUNT,
(char *) page);
free_page(page);
return retval;
}
retval = copy_mount_options (type, &page);
if (retval < 0)
return retval;
fstype = get_fs_type((char *) page);
free_page(page);
if (!fstype)
return -ENODEV;
t = fstype->name;
fops = NULL;
if (fstype->requires_dev) {
retval = namei(dev_name, &inode);
if (retval)
return retval;
if (!S_ISBLK(inode->i_mode)) {
iput(inode);
return -ENOTBLK;
}
if (IS_NODEV(inode)) {
iput(inode);
return -EACCES;
}
dev = inode->i_rdev;
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inode);
return -ENXIO;
}
fops = get_blkfops(MAJOR(dev));
if (!fops) {
iput(inode);
return -ENOTBLK;
}
if (fops->open) {
struct file dummy; /* allows read-write or read-only flag */
memset(&dummy, 0, sizeof(dummy));
dummy.f_inode = inode;
dummy.f_mode = (new_flags & MS_RDONLY) ? 1 : 3;
retval = fops->open(inode, &dummy);
if (retval) {
iput(inode);
return retval;
}
}
} else {
if (!(dev = get_unnamed_dev()))
return -EMFILE;
inode = NULL;
}
page = 0;
if ((new_flags & MS_MGC_MSK) == MS_MGC_VAL) {
flags = new_flags & ~MS_MGC_MSK;
retval = copy_mount_options(data, &page);
if (retval < 0) {
iput(inode);
return retval;
}
}
retval = do_mount(dev,dev_name,dir_name,t,flags,(void *) page);
free_page(page);
if (retval && fops && fops->release)
fops->release(inode, NULL);
iput(inode);
return retval;
}
int sys_mount(char *dev_name, char *dir_name, char *type)
{
struct file_system_type *fstype;
struct inode *inode;
register struct inode *inodep;
register struct file_operations *fops;
kdev_t dev;
int retval;
char *t;
int new_flags = 0;
#ifdef CONFIG_FULL_VFS
/* FIXME ltype is way too big for our stack goal.. */
char ltype[16]; /* is enough isn't it? */
#endif
if (!suser())
return -EPERM;
#ifdef BLOAT_FS /* new_flags is set to zero, so this is never true. */
if ((new_flags & MS_REMOUNT) == MS_REMOUNT) {
retval = do_remount(dir_name, new_flags & ~MS_REMOUNT, NULL);
return retval;
}
#endif
/*
* FIMXE: copy type to user cleanly or use numeric types ??
*/
#ifdef CONFIG_FULL_VFS
debug("MOUNT: performing type check\n");
if ((retval = strlen_fromfs(type)) >= 16) {
debug("MOUNT: type size exceeds 16 characters, trunctating\n");
retval = 15;
}
verified_memcpy_fromfs(ltype, type, retval);
ltype[retval] = '\0'; /* make asciiz again */
fstype = get_fs_type(ltype);
if (!fstype)
return -ENODEV;
debug("MOUNT: type check okay\n");
#else
fstype = file_systems[0];
#endif
t = fstype->name;
fops = NULL;
#ifdef BLOAT_FS
if (fstype->requires_dev) {
#endif
retval = namei(dev_name, &inode, 0, 0);
if (retval)
return retval;
inodep = inode;
debug("MOUNT: made it through namei\n");
if (!S_ISBLK(inodep->i_mode)) {
NOTBLK:
iput(inodep);
return -ENOTBLK;
}
if (IS_NODEV(inodep)) {
iput(inodep);
return -EACCES;
}
dev = inodep->i_rdev;
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inodep);
return -ENXIO;
}
fops = get_blkfops(MAJOR(dev));
if (!fops) {
goto NOTBLK;
}
if (fops->open) {
struct file dummy; /* allows read-write or read-only flag */
memset(&dummy, 0, sizeof(dummy));
dummy.f_inode = inodep;
dummy.f_mode = (new_flags & MS_RDONLY) ? ((mode_t) 1)
: ((mode_t) 3);
retval = fops->open(inodep, &dummy);
if (retval) {
iput(inodep);
return retval;
}
}
#ifdef BLOAT_FS
} else
printk("unnumbered fs is unsupported.\n");
#endif
retval = do_mount(dev, dir_name, t, new_flags, NULL);
if (retval && fops && fops->release)
fops->release(inodep, NULL);
iput(inodep);
return retval;
}
/*
* Flags is a 16-bit value that allows up to 16 non-fs dependent flags to
* be given to the mount() call (ie: read-only, no-dev, no-suid etc).
*
* data is a (void *) that can point to any structure up to
* PAGE_SIZE-1 bytes, which can contain arbitrary fs-dependent
* information (or be NULL).
*
* NOTE! As old versions of mount() didn't use this setup, the flags
* have to have a special 16-bit magic number in the high word:
* 0xC0ED. If this magic word isn't present, the flags and data info
* aren't used, as the syscall assumes we are talking to an older
* version that didn't understand them.
*/
asmlinkage int sys_mount(char * dev_name, char * dir_name, char * type,
unsigned long new_flags, void * data)
{
struct file_system_type * fstype;
struct dentry * dentry = NULL;
struct inode * inode = NULL;
kdev_t dev;
int retval = -EPERM;
unsigned long flags = 0;
unsigned long page = 0;
struct file dummy; /* allows read-write or read-only flag */
lock_kernel();
if (!capable(CAP_SYS_ADMIN))
goto out;
if ((new_flags &
(MS_MGC_MSK | MS_REMOUNT)) == (MS_MGC_VAL | MS_REMOUNT)) {
retval = copy_mount_options (data, &page);
if (retval < 0)
goto out;
retval = do_remount(dir_name,
new_flags & ~MS_MGC_MSK & ~MS_REMOUNT,
(char *) page);
free_mount_page(page);
goto out;
}
retval = copy_mount_options (type, &page);
if (retval < 0)
goto out;
fstype = get_fs_type((char *) page);
free_mount_page(page);
retval = -ENODEV;
if (!fstype)
goto out;
memset(&dummy, 0, sizeof(dummy));
if (fstype->fs_flags & FS_REQUIRES_DEV) {
dentry = namei(dev_name);
retval = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out;
inode = dentry->d_inode;
retval = -ENOTBLK;
if (!S_ISBLK(inode->i_mode))
goto dput_and_out;
retval = -EACCES;
if (IS_NODEV(inode))
goto dput_and_out;
dev = inode->i_rdev;
retval = -ENXIO;
if (MAJOR(dev) >= MAX_BLKDEV)
goto dput_and_out;
retval = -ENOTBLK;
dummy.f_op = get_blkfops(MAJOR(dev));
if (!dummy.f_op)
goto dput_and_out;
if (dummy.f_op->open) {
dummy.f_dentry = dentry;
dummy.f_mode = (new_flags & MS_RDONLY) ? 1 : 3;
retval = dummy.f_op->open(inode, &dummy);
if (retval)
goto dput_and_out;
}
} else {
retval = -EMFILE;
if (!(dev = get_unnamed_dev()))
goto out;
}
page = 0;
if ((new_flags & MS_MGC_MSK) == MS_MGC_VAL) {
flags = new_flags & ~MS_MGC_MSK;
retval = copy_mount_options(data, &page);
if (retval < 0)
goto clean_up;
}
retval = do_mount(dev, dev_name, dir_name, fstype->name, flags,
(void *) page);
free_mount_page(page);
if (retval)
goto clean_up;
dput_and_out:
dput(dentry);
out:
unlock_kernel();
return retval;
clean_up:
if (dummy.f_op) {
if (dummy.f_op->release)
dummy.f_op->release(inode, NULL);
} else
put_unnamed_dev(dev);
goto dput_and_out;
}