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nfs42: respect clone_blksize

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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>
This commit is contained in:
Peng Tao 2015-09-26 02:24:38 +08:00 committed by Trond Myklebust
parent 2a92ee92d4
commit 811b7b85d6
1 changed files with 11 additions and 0 deletions
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11
fs/nfs/nfs4file.c
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@ -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);