fs/locks: pass kernel struct flock to fcntl_getlk/setlk
This will make it easier to implement a sane compat fcntl syscall. [ jlayton: fix undeclared identifiers in 32-bit fcntl64 syscall handler ] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Christoph Hellwig
Jeff Layton
Родитель
80b79dd0e2
Коммит
a75d30c772
27
fs/fcntl.c
27
fs/fcntl.c
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@ -246,6 +246,8 @@ static int f_getowner_uids(struct file *filp, unsigned long arg)
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static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
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struct file *filp)
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{
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void __user *argp = (void __user *)arg;
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struct flock flock;
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long err = -EINVAL;
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switch (cmd) {
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@ -273,7 +275,11 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
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case F_OFD_GETLK:
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#endif
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case F_GETLK:
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err = fcntl_getlk(filp, cmd, (struct flock __user *) arg);
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if (copy_from_user(&flock, argp, sizeof(flock)))
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return -EFAULT;
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err = fcntl_getlk(filp, cmd, &flock);
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if (!err && copy_to_user(argp, &flock, sizeof(flock)))
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return -EFAULT;
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break;
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#if BITS_PER_LONG != 32
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/* 32-bit arches must use fcntl64() */
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@ -283,7 +289,9 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
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/* Fallthrough */
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case F_SETLK:
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case F_SETLKW:
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err = fcntl_setlk(fd, filp, cmd, (struct flock __user *) arg);
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if (copy_from_user(&flock, argp, sizeof(flock)))
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return -EFAULT;
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err = fcntl_setlk(fd, filp, cmd, &flock);
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break;
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case F_GETOWN:
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/*
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@ -383,7 +391,9 @@ out:
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SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
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unsigned long, arg)
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{
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void __user *argp = (void __user *)arg;
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struct fd f = fdget_raw(fd);
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struct flock64 flock;
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long err = -EBADF;
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if (!f.file)
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@ -401,14 +411,21 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
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switch (cmd) {
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case F_GETLK64:
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case F_OFD_GETLK:
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err = fcntl_getlk64(f.file, cmd, (struct flock64 __user *) arg);
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err = -EFAULT;
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if (copy_from_user(&flock, argp, sizeof(flock)))
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break;
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err = fcntl_getlk64(f.file, cmd, &flock);
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if (!err && copy_to_user(argp, &flock, sizeof(flock)))
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err = -EFAULT;
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break;
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case F_SETLK64:
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case F_SETLKW64:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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err = fcntl_setlk64(fd, f.file, cmd,
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(struct flock64 __user *) arg);
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err = -EFAULT;
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if (copy_from_user(&flock, argp, sizeof(flock)))
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break;
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err = fcntl_setlk64(fd, f.file, cmd, &flock);
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break;
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default:
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err = do_fcntl(fd, cmd, arg, f.file);
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79
fs/locks.c
79
fs/locks.c
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@ -2084,26 +2084,22 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
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/* Report the first existing lock that would conflict with l.
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* This implements the F_GETLK command of fcntl().
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*/
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int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
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int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
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{
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struct file_lock file_lock;
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struct flock flock;
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int error;
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error = -EFAULT;
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if (copy_from_user(&flock, l, sizeof(flock)))
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goto out;
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error = -EINVAL;
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if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
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if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
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goto out;
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error = flock_to_posix_lock(filp, &file_lock, &flock);
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error = flock_to_posix_lock(filp, &file_lock, flock);
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if (error)
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goto out;
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if (cmd == F_OFD_GETLK) {
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_GETLK;
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@ -2115,15 +2111,12 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
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if (error)
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goto out;
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flock.l_type = file_lock.fl_type;
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flock->l_type = file_lock.fl_type;
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if (file_lock.fl_type != F_UNLCK) {
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error = posix_lock_to_flock(&flock, &file_lock);
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error = posix_lock_to_flock(flock, &file_lock);
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if (error)
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goto rel_priv;
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}
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error = -EFAULT;
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if (!copy_to_user(l, &flock, sizeof(flock)))
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error = 0;
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rel_priv:
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locks_release_private(&file_lock);
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out:
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@ -2216,26 +2209,16 @@ check_fmode_for_setlk(struct file_lock *fl)
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* This implements both the F_SETLK and F_SETLKW commands of fcntl().
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*/
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int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
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struct flock __user *l)
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struct flock *flock)
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{
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struct file_lock *file_lock = locks_alloc_lock();
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struct flock flock;
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struct inode *inode;
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struct inode *inode = locks_inode(filp);
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struct file *f;
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int error;
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if (file_lock == NULL)
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return -ENOLCK;
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inode = locks_inode(filp);
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/*
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* This might block, so we do it before checking the inode.
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*/
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error = -EFAULT;
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if (copy_from_user(&flock, l, sizeof(flock)))
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goto out;
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/* Don't allow mandatory locks on files that may be memory mapped
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* and shared.
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*/
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@ -2244,7 +2227,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
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goto out;
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}
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error = flock_to_posix_lock(filp, file_lock, &flock);
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error = flock_to_posix_lock(filp, file_lock, flock);
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if (error)
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goto out;
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@ -2259,7 +2242,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
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switch (cmd) {
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case F_OFD_SETLK:
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_SETLK;
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@ -2268,7 +2251,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
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break;
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case F_OFD_SETLKW:
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_SETLKW;
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@ -2313,26 +2296,22 @@ out:
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/* Report the first existing lock that would conflict with l.
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* This implements the F_GETLK command of fcntl().
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*/
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int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
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int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
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{
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struct file_lock file_lock;
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struct flock64 flock;
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int error;
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error = -EFAULT;
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if (copy_from_user(&flock, l, sizeof(flock)))
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goto out;
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error = -EINVAL;
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if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
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if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
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goto out;
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error = flock64_to_posix_lock(filp, &file_lock, &flock);
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error = flock64_to_posix_lock(filp, &file_lock, flock);
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if (error)
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goto out;
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if (cmd == F_OFD_GETLK) {
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_GETLK64;
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@ -2344,13 +2323,9 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
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if (error)
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goto out;
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flock.l_type = file_lock.fl_type;
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flock->l_type = file_lock.fl_type;
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if (file_lock.fl_type != F_UNLCK)
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posix_lock_to_flock64(&flock, &file_lock);
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error = -EFAULT;
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if (!copy_to_user(l, &flock, sizeof(flock)))
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error = 0;
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posix_lock_to_flock64(flock, &file_lock);
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locks_release_private(&file_lock);
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out:
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@ -2361,26 +2336,16 @@ out:
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* This implements both the F_SETLK and F_SETLKW commands of fcntl().
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*/
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int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
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struct flock64 __user *l)
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struct flock64 *flock)
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{
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struct file_lock *file_lock = locks_alloc_lock();
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struct flock64 flock;
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struct inode *inode;
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struct inode *inode = locks_inode(filp);
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struct file *f;
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int error;
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if (file_lock == NULL)
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return -ENOLCK;
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/*
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* This might block, so we do it before checking the inode.
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*/
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error = -EFAULT;
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if (copy_from_user(&flock, l, sizeof(flock)))
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goto out;
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inode = locks_inode(filp);
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/* Don't allow mandatory locks on files that may be memory mapped
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* and shared.
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*/
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@ -2389,7 +2354,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
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goto out;
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}
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error = flock64_to_posix_lock(filp, file_lock, &flock);
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error = flock64_to_posix_lock(filp, file_lock, flock);
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if (error)
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goto out;
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@ -2404,7 +2369,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
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switch (cmd) {
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case F_OFD_SETLK:
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_SETLK64;
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@ -2413,7 +2378,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
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break;
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case F_OFD_SETLKW:
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error = -EINVAL;
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if (flock.l_pid != 0)
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if (flock->l_pid != 0)
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goto out;
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cmd = F_SETLKW64;
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@ -1038,14 +1038,14 @@ static inline struct inode *locks_inode(const struct file *f)
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}
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#ifdef CONFIG_FILE_LOCKING
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extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
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extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
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extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
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struct flock __user *);
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struct flock *);
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#if BITS_PER_LONG == 32
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extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *);
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extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *);
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extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
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struct flock64 __user *);
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struct flock64 *);
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#endif
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extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
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