diff options
| author | Peng Tao <tao.peng@primarydata.com> | 2015-09-25 20:24:38 +0200 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-10-15 22:08:28 +0200 |
| commit | 811b7b85d6641df580a6c43184cf13d6fcc7498d (patch) | |
| tree | 71242d268c0d1ca845fb2e8ed55e1e3c4d3de134 /fs/nfs | |
| parent | nfs: get clone_blksize when probing fsinfo (diff) | |
| download | linux-811b7b85d6641df580a6c43184cf13d6fcc7498d.tar.xz linux-811b7b85d6641df580a6c43184cf13d6fcc7498d.zip | |
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 <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/nfs4file.c | 11 |
1 files changed, 11 insertions, 0 deletions
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); |