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authorChristoph Hellwig <hch@lst.de>2017-05-27 06:07:19 -0400
committerJeff Layton <jlayton@redhat.com>2017-05-27 06:07:19 -0400
commita75d30c772078546ac00399a94ecdc82df1a4d72 (patch)
treec3e90e52f03092b6d3c59a949c7a2fceed8380af /fs/locks.c
parent80b79dd0e2f29f06a6a54a5755c718f1c7ebb136 (diff)
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>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c79
1 files changed, 22 insertions, 57 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 4a4543a7f9c1..afefeb4ad6de 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -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;