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fs/locks: pass kernel struct flock to fcntl_getlk/setlk

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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 2017-05-27 06:07:19 -04:00 • committed by Jeff Layton
parent 80b79dd0e2
commit a75d30c772
3 changed files with 48 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

79
fs/locks.c
View file

@ -2084,26 +2084,22 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
/* Report the first existing lock that would conflict with l.
* This implements the F_GETLK command of fcntl().
*/
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
{
struct file_lock file_lock;
struct flock flock;
int error;
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
error = -EINVAL;
if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
error = flock_to_posix_lock(filp, &file_lock, &flock);
error = flock_to_posix_lock(filp, &file_lock, flock);
if (error)
goto out;
if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_GETLK;
@ -2115,15 +2111,12 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
if (error)
goto out;
flock.l_type = file_lock.fl_type;
flock->l_type = file_lock.fl_type;
if (file_lock.fl_type != F_UNLCK) {
error = posix_lock_to_flock(&flock, &file_lock);
error = posix_lock_to_flock(flock, &file_lock);
if (error)
goto rel_priv;
}
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
rel_priv:
locks_release_private(&file_lock);
out:
@ -2216,26 +2209,16 @@ check_fmode_for_setlk(struct file_lock *fl)
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
struct flock __user *l)
struct flock *flock)
{
struct file_lock *file_lock = locks_alloc_lock();
struct flock flock;
struct inode *inode;
struct inode *inode = locks_inode(filp);
struct file *f;
int error;
if (file_lock == NULL)
return -ENOLCK;
inode = locks_inode(filp);
/*
* This might block, so we do it before checking the inode.
*/
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
@ -2244,7 +2227,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
goto out;
}
error = flock_to_posix_lock(filp, file_lock, &flock);
error = flock_to_posix_lock(filp, file_lock, flock);
if (error)
goto out;
@ -2259,7 +2242,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
switch (cmd) {
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLK;
@ -2268,7 +2251,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
break;
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLKW;
@ -2313,26 +2296,22 @@ out:
/* Report the first existing lock that would conflict with l.
* This implements the F_GETLK command of fcntl().
*/
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
{
struct file_lock file_lock;
struct flock64 flock;
int error;
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
error = -EINVAL;
if ((flock.l_type != F_RDLCK) && (flock.l_type != F_WRLCK))
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
goto out;
error = flock64_to_posix_lock(filp, &file_lock, &flock);
error = flock64_to_posix_lock(filp, &file_lock, flock);
if (error)
goto out;
if (cmd == F_OFD_GETLK) {
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_GETLK64;
@ -2344,13 +2323,9 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
if (error)
goto out;
flock.l_type = file_lock.fl_type;
flock->l_type = file_lock.fl_type;
if (file_lock.fl_type != F_UNLCK)
posix_lock_to_flock64(&flock, &file_lock);
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
posix_lock_to_flock64(flock, &file_lock);
locks_release_private(&file_lock);
out:
@ -2361,26 +2336,16 @@ out:
* This implements both the F_SETLK and F_SETLKW commands of fcntl().
*/
int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
struct flock64 __user *l)
struct flock64 *flock)
{
struct file_lock *file_lock = locks_alloc_lock();
struct flock64 flock;
struct inode *inode;
struct inode *inode = locks_inode(filp);
struct file *f;
int error;
if (file_lock == NULL)
return -ENOLCK;
/*
* This might block, so we do it before checking the inode.
*/
error = -EFAULT;
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
inode = locks_inode(filp);
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
*/
@ -2389,7 +2354,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
goto out;
}
error = flock64_to_posix_lock(filp, file_lock, &flock);
error = flock64_to_posix_lock(filp, file_lock, flock);
if (error)
goto out;
@ -2404,7 +2369,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
switch (cmd) {
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLK64;
@ -2413,7 +2378,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
break;
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
if (flock->l_pid != 0)
goto out;
cmd = F_SETLKW64;