From: Nathan Lynch <ntl@xxxxxxxxx>
When restoring process state from a checkpoint image, it will be
necessary to restore file status flags; add vfs_fcntl() for this
purpose.
Based on original code by Oren Laadan.
Signed-off-by: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
[ntl: extracted from "c/r: checkpoint and restart open file descriptors"]
Signed-off-by: Nathan Lynch <ntl@xxxxxxxxx>
---
fs/fcntl.c | 21 +++++++++++++--------
include/linux/fs.h | 2 ++
2 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/fs/fcntl.c b/fs/fcntl.c
index ecc8b39..8e797b7 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -426,6 +426,18 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
return err;
}
+int vfs_fcntl(int fd, unsigned int cmd, unsigned long arg, struct file *filp)
+{
+ int err;
+
+ err = security_file_fcntl(filp, cmd, arg);
+ if (err)
+ goto out;
+ err = do_fcntl(fd, cmd, arg, filp);
+ out:
+ return err;
+}
+
SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
{
struct file *filp;
@@ -435,14 +447,7 @@ SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
if (!filp)
goto out;
- err = security_file_fcntl(filp, cmd, arg);
- if (err) {
- fput(filp);
- return err;
- }
-
- err = do_fcntl(fd, cmd, arg, filp);
-
+ err = vfs_fcntl(fd, cmd, arg, filp);
fput(filp);
out:
return err;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 315ded4..175bb75 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1112,6 +1112,8 @@ struct file_lock {
#include <linux/fcntl.h>
+extern int vfs_fcntl(int fd, unsigned cmd, unsigned long arg, struct file *fp);
+
extern void send_sigio(struct fown_struct *fown, int fd, int band);
#ifdef CONFIG_FILE_LOCKING
--
1.7.4
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