asmlinkage int sys_umount(char * name, int flags)
{
struct dentry * dentry;
int retval;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
lock_kernel();
dentry = namei(name);
retval = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
struct inode * inode = dentry->d_inode;
kdev_t dev = inode->i_rdev;
retval = 0;
if (S_ISBLK(inode->i_mode)) {
if (IS_NODEV(inode))
retval = -EACCES;
} else {
struct super_block *sb = inode->i_sb;
retval = -EINVAL;
if (sb && inode == sb->s_root->d_inode) {
dev = sb->s_dev;
retval = 0;
}
}
dput(dentry);
if (!retval)
retval = umount_dev(dev, flags);
}
unlock_kernel();
return retval;
}
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;
}
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;
}
asmlinkage int sys_umount(char * name)
{
struct inode * inode;
kdev_t dev;
int retval;
struct inode dummy_inode;
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->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_rdev = dev;
inode = &dummy_inode;
}
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inode);
return -ENXIO;
}
retval = do_umount(dev,0);
if (!retval) {
fsync_dev(dev);
if (dev != ROOT_DEV) {
blkdev_release (inode);
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 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;
}
