NFSD: Implement the COPY call
I only implemented the sync version of this call, since it's the
easiest. I can simply call vfs_copy_range() and have the vfs do the
right thing for the filesystem being exported.
Signed-off-by: Anna Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 1fb2227..abb09b5 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1010,47 +1010,97 @@
}
static __be32
-nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_clone *clone)
+nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ stateid_t *src_stateid, struct file **src,
+ stateid_t *dst_stateid, struct file **dst)
{
- struct file *src, *dst;
__be32 status;
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
- &clone->cl_src_stateid, RD_STATE,
- &src, NULL);
+ 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);
+ 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)) {
+ if (!S_ISREG(file_inode(*src)->i_mode) ||
+ !S_ISREG(file_inode(*dst)->i_mode)) {
status = nfserr_wrong_type;
goto out_put_dst;
}
+out:
+ return status;
+out_put_dst:
+ fput(*dst);
+out_put_src:
+ fput(*src);
+ goto out;
+}
+
+static __be32
+nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_clone *clone)
+{
+ struct file *src, *dst;
+ __be32 status;
+
+ status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
+ &clone->cl_dst_stateid, &dst);
+ if (status)
+ goto out;
+
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_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_copy *copy)
+{
+ struct file *src, *dst;
+ __be32 status;
+ ssize_t bytes;
+
+ status = nfsd4_verify_copy(rqstp, cstate, ©->cp_src_stateid, &src,
+ ©->cp_dst_stateid, &dst);
+ if (status)
+ goto out;
+
+ bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
+ dst, copy->cp_dst_pos, copy->cp_count);
+
+ if (bytes < 0)
+ status = nfserrno(bytes);
+ else {
+ copy->cp_res.wr_bytes_written = bytes;
+ copy->cp_res.wr_stable_how = NFS_UNSTABLE;
+ copy->cp_consecutive = 1;
+ copy->cp_synchronous = 1;
+ gen_boot_verifier(©->cp_res.wr_verifier, SVC_NET(rqstp));
+ status = nfs_ok;
+ }
+
+ fput(src);
+ fput(dst);
+out:
+ return status;
+}
+
+static __be32
nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_fallocate *fallocate, int flags)
{
@@ -1966,6 +2016,18 @@
op_encode_channel_attrs_maxsz) * sizeof(__be32);
}
+static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
+{
+ return (op_encode_hdr_size +
+ 1 /* wr_callback */ +
+ op_encode_stateid_maxsz /* wr_callback */ +
+ 2 /* wr_count */ +
+ 1 /* wr_committed */ +
+ op_encode_verifier_maxsz +
+ 1 /* cr_consecutive */ +
+ 1 /* cr_synchronous */) * sizeof(__be32);
+}
+
#ifdef CONFIG_NFSD_PNFS
/*
* At this stage we don't really know what layout driver will handle the request,
@@ -2328,6 +2390,12 @@
.op_name = "OP_CLONE",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
+ [OP_COPY] = {
+ .op_func = (nfsd4op_func)nfsd4_copy,
+ .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
+ .op_name = "OP_COPY",
+ .op_rsize_bop = (nfsd4op_rsize)nfsd4_copy_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 7f8232e..c2d2895 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1694,6 +1694,30 @@
}
static __be32
+nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
+{
+ DECODE_HEAD;
+ unsigned int tmp;
+
+ status = nfsd4_decode_stateid(argp, ©->cp_src_stateid);
+ if (status)
+ return status;
+ status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid);
+ if (status)
+ return status;
+
+ READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
+ p = xdr_decode_hyper(p, ©->cp_src_pos);
+ p = xdr_decode_hyper(p, ©->cp_dst_pos);
+ p = xdr_decode_hyper(p, ©->cp_count);
+ copy->cp_consecutive = be32_to_cpup(p++);
+ copy->cp_synchronous = be32_to_cpup(p++);
+ tmp = be32_to_cpup(p); /* Source server list not supported */
+
+ DECODE_TAIL;
+}
+
+static __be32
nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
{
DECODE_HEAD;
@@ -1793,7 +1817,7 @@
/* new operations for NFSv4.2 */
[OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
- [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
+ [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
[OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
[OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
@@ -4202,6 +4226,41 @@
#endif /* CONFIG_NFSD_PNFS */
static __be32
+nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
+ if (!p)
+ return nfserr_resource;
+
+ *p++ = cpu_to_be32(0);
+ p = xdr_encode_hyper(p, write->wr_bytes_written);
+ *p++ = cpu_to_be32(write->wr_stable_how);
+ p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
+ NFS4_VERIFIER_SIZE);
+ return nfs_ok;
+}
+
+static __be32
+nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
+ struct nfsd4_copy *copy)
+{
+ __be32 *p;
+
+ if (!nfserr) {
+ nfserr = nfsd42_encode_write_res(resp, ©->cp_res);
+ if (nfserr)
+ return nfserr;
+
+ p = xdr_reserve_space(&resp->xdr, 4 + 4);
+ *p++ = cpu_to_be32(copy->cp_consecutive);
+ *p++ = cpu_to_be32(copy->cp_synchronous);
+ }
+ return nfserr;
+}
+
+static __be32
nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_seek *seek)
{
@@ -4300,7 +4359,7 @@
/* NFSv4.2 operations */
[OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
- [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
+ [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
[OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
[OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
[OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index ff476e6..8ca642f 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -513,6 +513,22 @@
count));
}
+ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst,
+ u64 dst_pos, u64 count)
+{
+
+ /*
+ * Limit copy to 4MB to prevent indefinitely blocking an nfsd
+ * thread and client rpc slot. The choice of 4MB is somewhat
+ * arbitrary. We might instead base this on r/wsize, or make it
+ * tunable, or use a time instead of a byte limit, or implement
+ * asynchronous copy. In theory a client could also recognize a
+ * limit like this and pipeline multiple COPY requests.
+ */
+ count = min_t(u64, count, 1 << 22);
+ return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0);
+}
+
__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 3cbb1b3..0bf9e7b 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -96,6 +96,8 @@
struct svc_fh *res);
__be32 nfsd_link(struct svc_rqst *, struct svc_fh *,
char *, int, struct svc_fh *);
+ssize_t nfsd_copy_file_range(struct file *, u64,
+ struct file *, u64, u64);
__be32 nfsd_rename(struct svc_rqst *,
struct svc_fh *, char *, int,
struct svc_fh *, char *, int);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index beea0c5..8fda4ab 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -503,6 +503,28 @@
u64 cl_count;
};
+struct nfsd42_write_res {
+ u64 wr_bytes_written;
+ u32 wr_stable_how;
+ nfs4_verifier wr_verifier;
+};
+
+struct nfsd4_copy {
+ /* request */
+ stateid_t cp_src_stateid;
+ stateid_t cp_dst_stateid;
+ u64 cp_src_pos;
+ u64 cp_dst_pos;
+ u64 cp_count;
+
+ /* both */
+ bool cp_consecutive;
+ bool cp_synchronous;
+
+ /* response */
+ struct nfsd42_write_res cp_res;
+};
+
struct nfsd4_seek {
/* request */
stateid_t seek_stateid;
@@ -568,6 +590,7 @@
struct nfsd4_fallocate allocate;
struct nfsd4_fallocate deallocate;
struct nfsd4_clone clone;
+ struct nfsd4_copy copy;
struct nfsd4_seek seek;
} u;
struct nfs4_replay * replay;