On Thu, Jul 19, 2018 at 10:18 PM Chengguang Xu <cgxu519@xxxxxxx> wrote: > > cephfs allows dynamically changing(increase or decrease) maximum file > size (sb->s_maxbytes). So in some cases(e.g. decrease s_maxbytes to a > relatively small size), the size of existing file may become larger > than current sb->s_maxbytes, in this case, blocking exceeded data range > will cause file incomplete. > > This patch series tries to fix the issue by comparing real file size > and max file size limit, and in order to not bother to VFS and other > specific filesystems we just simply set sb->s_maxbytes to > MAX_LFS_FILESIZE so that we can pass all checks in VFS successfully. > We add new field max_file_size in struct ceph_fs_client to store > max file size limit and doing additional proper checks based on it > in cephfs code. > > v1->v2: > - delete unnecessary fix in ceph_read_iter(). > > Chengguang Xu (4): > ceph: add new field max_file_size in ceph_fs_client > ceph: add additional range check in ceph_fallocate() > ceph: add additional offset check in ceph_write_iter() > ceph: compare fsc->max_file_size and inode->i_size for max file size > limit > > fs/ceph/file.c | 18 +++++++++++++++++- > fs/ceph/mds_client.c | 3 ++- > fs/ceph/super.c | 3 ++- > fs/ceph/super.h | 1 + > 4 files changed, 22 insertions(+), 3 deletions(-) > > -- > 2.17.1 > applied, thanks Yan, Zheng > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
