From 811b7b85d6641df580a6c43184cf13d6fcc7498d Mon Sep 17 00:00:00 2001 From: Peng Tao Date: Sat, 26 Sep 2015 02:24:38 +0800 Subject: [PATCH] nfs42: respect clone_blksize draft-ietf-nfsv4-minorversion2-38.txt says: Both cl_src_offset and cl_dst_offset must be aligned to the clone block size Section 12.2.1. The number of bytes to be cloned must be a multiple of the clone block size, except in the case in which cl_src_offset plus the number of bytes to be cloned is equal to the source file size. Signed-off-by: Peng Tao Signed-off-by: Trond Myklebust --- fs/nfs/nfs4file.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index fc68ba5f030c..4f463dd8bae3 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -199,8 +199,10 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd, u64 src_off, u64 dst_off, u64 count) { struct inode *dst_inode = file_inode(dst_file); + struct nfs_server *server = NFS_SERVER(dst_inode); struct fd src_file; struct inode *src_inode; + unsigned int bs = server->clone_blksize; int ret; /* dst file must be opened for writing */ @@ -238,6 +240,15 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd, src_inode->i_sb != dst_inode->i_sb) goto out_fput; + /* check alignment w.r.t. clone_blksize */ + ret = -EINVAL; + if (bs) { + if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) + goto out_fput; + if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) + goto out_fput; + } + /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ if (dst_inode < src_inode) { mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT); -- 2.30.2