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@xxxxxx>
Acked-by: J. Bruce Fields <bfields@xxxxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
fs/nfsd/nfs4xdr.c | 21 +++++++++++++++++++++
fs/nfsd/vfs.c | 8 ++++++++
fs/nfsd/vfs.h | 2 ++
fs/nfsd/xdr4.h | 10 ++++++++++
include/linux/nfs4.h | 4 ++--
6 files changed, 90 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 3ba10a3..819ad81 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1012,6 +1012,47 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
}
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",
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 51c9e9c..924416f 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1675,6 +1675,25 @@ nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
}
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)
{
DECODE_HEAD;
@@ -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,
};
/*
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 994d66f..5411bf0 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -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)
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index fcfc48c..c11ba31 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -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,
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index ce7362c..d955481 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -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;
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index e7e7853..43aeabd 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -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,
--
1.9.1
--
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