diff options
| author |   Al Viro <viro@zeniv.linux.org.uk> | 2019-04-04 21:04:13 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-04-04 21:04:13 -0400 |
| commit | 9419a3191dcb27f24478d288abaab697228d28e6 (patch) | |
| tree | 7fd926e271483ad1270c5440d4839fc3711e31bb /include/linux/mount.h | |
| parent | Linux 5.1-rc3 (diff) | |
| download | linux-dev-9419a3191dcb27f24478d288abaab697228d28e6.tar.xz linux-dev-9419a3191dcb27f24478d288abaab697228d28e6.zip | |
acct_on(): don't mess with freeze protection
What happens there is that we are replacing file->path.mnt of
a file we'd just opened with a clone and we need the write
count contribution to be transferred from original mount to
new one. That's it. We do *NOT* want any kind of freeze
protection for the duration of switchover.
IOW, we should just use __mnt_{want,drop}_write() for that
switchover; no need to bother with mnt_{want,drop}_write()
there.
Tested-by: Amir Goldstein <amir73il@gmail.com>
Reported-by: syzbot+2a73a6ea9507b7112141@syzkaller.appspotmail.com
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/mount.h')
| -rw-r--r-- | include/linux/mount.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 9197ddbf35fb..bf8cc4108b8f 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -87,6 +87,8 @@ extern bool mnt_may_suid(struct vfsmount *mnt); struct path; extern struct vfsmount *clone_private_mount(const struct path *path); +extern int __mnt_want_write(struct vfsmount *); +extern void __mnt_drop_write(struct vfsmount *); struct file_system_type; extern struct vfsmount *fc_mount(struct fs_context *fc); |