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Subject[PATCH 35/39] union-mount: Implement union-aware chmod()/fchmodat()
Date

Signed-off-by: Valerie Aurora <vaurora@redhat.com>
---
fs/open.c | 25 +++++++++++++++++++++----
1 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index e4fc8e5..5c9933f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -503,18 +503,32 @@ out:
SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode)
{
struct path path;
+ struct nameidata nd;
+ struct vfsmount *mnt;
struct inode *inode;
+ char *tmp;
int error;
struct iattr newattrs;

- error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
+ error = user_path_nd(dfd, filename, LOOKUP_FOLLOW, &nd,
+ &path, &tmp);
if (error)
goto out;
- inode = path.dentry->d_inode;

- error = mnt_want_write(path.mnt);
+ if (IS_DIR_UNIONED(nd.path.dentry))
+ mnt = nd.path.mnt;
+ else
+ mnt = path.mnt;
+
+ error = mnt_want_write(mnt);
if (error)
goto dput_and_out;
+
+ error = union_copyup(&nd, &path);
+ if (error)
+ goto mnt_drop_write_and_out;
+
+ inode = path.dentry->d_inode;
mutex_lock(&inode->i_mutex);
error = security_path_chmod(path.dentry, path.mnt, mode);
if (error)
@@ -526,9 +540,12 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode)
error = notify_change(path.dentry, &newattrs);
out_unlock:
mutex_unlock(&inode->i_mutex);
- mnt_drop_write(path.mnt);
+mnt_drop_write_and_out:
+ mnt_drop_write(mnt);
dput_and_out:
path_put(&path);
+ path_put(&nd.path);
+ putname(tmp);
out:
return error;
}
--
1.6.3.3


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