xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat()

Browse Source 
New LOOKUP flag, telling path_lookupat() to act as path_mountpointat().
IOW, traverse mounts at the final point and skip revalidation of the
location where it ends up.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2020-01-11 22:52:26 -05:00
parent cbae4d12ee
commit 161aff1d93
5 changed files with 12 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/namespace.c
View File

@@ -1669,7 +1669,7 @@ int ksys_umount(char __user *name, int flags)
struct path path;
struct mount *mnt;
int retval;
int lookup_flags = 0;
int lookup_flags = LOOKUP_MOUNTPOINT;
if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))
return -EINVAL;
@@ -1680,7 +1680,7 @@ int ksys_umount(char __user *name, int flags)
if (!(flags & UMOUNT_NOFOLLOW))
lookup_flags |= LOOKUP_FOLLOW;
retval = user_path_mountpoint_at(AT_FDCWD, name, lookup_flags, &path);
retval = user_path_at(AT_FDCWD, name, lookup_flags, &path);
if (retval)
goto out;
mnt = real_mount(path.mnt);