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nfsd: implement the NFSv4.2 CLONE operation

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This is basically a remote version of the btrfs CLONE operation,
so the implementation is fairly trivial.  Made even more trivial
by stealing the XDR code and general framework Anna Schumaker's
COPY prototype.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2015-12-03 12:59:52 +01:00 committed by Al Viro
parent aa0d6aed45
commit ffa0160a10
6 changed files with 90 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

47
fs/nfsd/nfs4proc.c
View file

@ -1011,6 +1011,47 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
return status;
}
static __be32
nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_clone *clone)
{
struct file *src, *dst;
__be32 status;
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
&clone->cl_src_stateid, RD_STATE,
&src, NULL);
if (status) {
dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
goto out;
}
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
&clone->cl_dst_stateid, WR_STATE,
&dst, NULL);
if (status) {
dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
goto out_put_src;
}
/* fix up for NFS-specific error code */
if (!S_ISREG(file_inode(src)->i_mode) ||
!S_ISREG(file_inode(dst)->i_mode)) {
status = nfserr_wrong_type;
goto out_put_dst;
}
status = nfsd4_clone_file_range(src, clone->cl_src_pos,
dst, clone->cl_dst_pos, clone->cl_count);
out_put_dst:
fput(dst);
out_put_src:
fput(src);
out:
return status;
}
static __be32
nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_fallocate *fallocate, int flags)
@ -2281,6 +2322,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_name = "OP_DEALLOCATE",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_CLONE] = {
.op_func = (nfsd4op_func)nfsd4_clone,
.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
.op_name = "OP_CLONE",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_SEEK] = {
.op_func = (nfsd4op_func)nfsd4_seek,
.op_name = "OP_SEEK",

21
fs/nfsd/nfs4xdr.c
View file

@ -1674,6 +1674,25 @@ nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
DECODE_TAIL;
}
static __be32
nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
{
DECODE_HEAD;
status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
if (status)
return status;
status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
if (status)
return status;
READ_BUF(8 + 8 + 8);
p = xdr_decode_hyper(p, &clone->cl_src_pos);
p = xdr_decode_hyper(p, &clone->cl_dst_pos);
p = xdr_decode_hyper(p, &clone->cl_count);
DECODE_TAIL;
}
static __be32
nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
{
@ -1785,6 +1804,7 @@ static nfsd4_dec nfsd4_dec_ops[] = {
[OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
[OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
};
static inline bool
@ -4292,6 +4312,7 @@ static nfsd4_enc nfsd4_enc_ops[] = {
[OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
[OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
[OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
[OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
};
/*

8
fs/nfsd/vfs.c
View file

@ -36,6 +36,7 @@
#endif /* CONFIG_NFSD_V3 */
#ifdef CONFIG_NFSD_V4
#include "../internal.h"
#include "acl.h"
#include "idmap.h"
#endif /* CONFIG_NFSD_V4 */
@ -498,6 +499,13 @@ __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
}
#endif
__be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
u64 dst_pos, u64 count)
{
return nfserrno(vfs_clone_file_range(src, src_pos, dst, dst_pos,
count));
}
__be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct file *file, loff_t offset, loff_t len,
int flags)

2
fs/nfsd/vfs.h
View file

@ -56,6 +56,8 @@ __be32 nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
struct xdr_netobj *);
__be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
struct file *, loff_t, loff_t, int);
__be32 nfsd4_clone_file_range(struct file *, u64, struct file *,
u64, u64);
#endif /* CONFIG_NFSD_V4 */
__be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
char *name, int len, struct iattr *attrs,

10
fs/nfsd/xdr4.h
View file

@ -491,6 +491,15 @@ struct nfsd4_fallocate {
u64 falloc_length;
};
struct nfsd4_clone {
/* request */
stateid_t cl_src_stateid;
stateid_t cl_dst_stateid;
u64 cl_src_pos;
u64 cl_dst_pos;
u64 cl_count;
};
struct nfsd4_seek {
/* request */
stateid_t seek_stateid;
@ -555,6 +564,7 @@ struct nfsd4_op {
/* NFSv4.2 */
struct nfsd4_fallocate allocate;
struct nfsd4_fallocate deallocate;
struct nfsd4_clone clone;
struct nfsd4_seek seek;
} u;
struct nfs4_replay * replay;

4
include/linux/nfs4.h
View file

@ -139,10 +139,10 @@ enum nfs_opnum4 {
Needs to be updated if more operations are defined in future.*/
#define FIRST_NFS4_OP OP_ACCESS
#define LAST_NFS4_OP OP_WRITE_SAME
#define LAST_NFS40_OP OP_RELEASE_LOCKOWNER
#define LAST_NFS41_OP OP_RECLAIM_COMPLETE
#define LAST_NFS42_OP OP_WRITE_SAME
#define LAST_NFS42_OP OP_CLONE
#define LAST_NFS4_OP LAST_NFS42_OP
enum nfsstat4 {
NFS4_OK = 0,