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.
Chengguang Xu (5):
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: add additional offset check in ceph_read_iter()
ceph: compare fsc->max_file_size and inode->i_size for max file size
limit
fs/ceph/file.c | 40 ++++++++++++++++++++++++++++++++--------
fs/ceph/mds_client.c | 3 ++-
fs/ceph/super.c | 3 ++-
fs/ceph/super.h | 1 +
4 files changed, 37 insertions(+), 10 deletions(-)
--
2.17.1
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