Commit e027253c authored by Xiubo Li's avatar Xiubo Li Committed by Ilya Dryomov

ceph: update the time stamps and try to drop the suid/sgid

The fallocate will try to clear the suid/sgid if a unprevileged user
changed the file.

There is no POSIX item requires that we should clear the suid/sgid
in fallocate code path but this is the default behaviour for most of
the filesystems and the VFS layer. And also the same for the write
code path, which have already support it.

And also we need to update the time stamps since the fallocate will
change the file contents.

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/58054Signed-off-by: default avatarXiubo Li <xiubli@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent c9c3395d
......@@ -2102,6 +2102,9 @@ static long ceph_fallocate(struct file *file, int mode,
loff_t endoff = 0;
loff_t size;
dout("%s %p %llx.%llx mode %x, offset %llu length %llu\n", __func__,
inode, ceph_vinop(inode), mode, offset, length);
if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
......@@ -2136,6 +2139,10 @@ static long ceph_fallocate(struct file *file, int mode,
if (ret < 0)
goto unlock;
ret = file_modified(file);
if (ret)
goto put_caps;
filemap_invalidate_lock(inode->i_mapping);
ceph_fscache_invalidate(inode, false);
ceph_zero_pagecache_range(inode, offset, length);
......@@ -2151,6 +2158,7 @@ static long ceph_fallocate(struct file *file, int mode,
}
filemap_invalidate_unlock(inode->i_mapping);
put_caps:
ceph_put_cap_refs(ci, got);
unlock:
inode_unlock(inode);
......
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