These patches add client and server support for the NFS v4.2 COPY operation,
and depend on the new copy_file_range() system call currently scheduled for
Linux 4.5.
Changes in v2:
- Preprocess filehandle op can choose between current_fh and save_fh
- NFSD doesnt' need to fsync() after vfs_copy_file_range() call
- Mark file as NFS_UNSTABLE in the copy return
- The client should send a commit if the file is copied with anything other
than NFS_FILE_SYNC
- Fix conflicts with CLONE
Questions, comments, and other testing ideas would be greatly appreciated!
Thanks,
Anna
Anna Schumaker (4):
NFSD: Don't pass filehandle to nfs4_preprocess_stateid_op()
NFSD: Implement the COPY call
NFS: Add COPY nfs operation
vfs_copy_range() test program
fs/nfs/nfs42.h | 1 +
fs/nfs/nfs42proc.c | 100 +++++++++++++++++++++++++++++++
fs/nfs/nfs42xdr.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4file.c | 23 ++++++++
fs/nfs/nfs4proc.c | 1 +
fs/nfs/nfs4xdr.c | 1 +
fs/nfs/objlayout/Makefile | 0
fs/nfsd/nfs4proc.c | 110 +++++++++++++++++++++++++++-------
fs/nfsd/nfs4state.c | 10 +++-
fs/nfsd/nfs4xdr.c | 62 +++++++++++++++++++-
fs/nfsd/state.h | 7 ++-
fs/nfsd/vfs.c | 20 +++++++
fs/nfsd/vfs.h | 1 +
fs/nfsd/xdr4.h | 23 ++++++++
include/linux/nfs4.h | 1 +
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 27 +++++++++
nfscopy.c | 59 +++++++++++++++++++
18 files changed, 563 insertions(+), 30 deletions(-)
create mode 100644 fs/nfs/objlayout/Makefile
create mode 100644 nfscopy.c
--
2.6.4
This reverts commit 3679e4c1ef1c00ea30d15b9ae59089b44dfe4137.
We either pass the current_fh or save_fh from the cstate structure, and
not some generic filehandle. Let's just add a flag to pick between these
two filehandles instead.
Signed-off-by: Anna Schumaker <[email protected]>
---
fs/nfs/objlayout/Makefile | 0
fs/nfsd/nfs4proc.c | 24 +++++++++++-------------
fs/nfsd/nfs4state.c | 10 +++++++---
fs/nfsd/state.h | 7 ++++---
4 files changed, 22 insertions(+), 19 deletions(-)
create mode 100644 fs/nfs/objlayout/Makefile
diff --git a/fs/nfs/objlayout/Makefile b/fs/nfs/objlayout/Makefile
new file mode 100644
index 0000000..e69de29
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 819ad81..4fbc86b 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -774,9 +774,8 @@ nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
/* check stateid */
- status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
- &read->rd_stateid, RD_STATE,
- &read->rd_filp, &read->rd_tmp_file);
+ status = nfs4_preprocess_stateid_op(rqstp, cstate, &read->rd_stateid,
+ RD_STATE, &read->rd_filp, &read->rd_tmp_file);
if (status) {
dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
goto out;
@@ -922,8 +921,7 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
status = nfs4_preprocess_stateid_op(rqstp, cstate,
- &cstate->current_fh, &setattr->sa_stateid,
- WR_STATE, NULL, NULL);
+ &setattr->sa_stateid, WR_STATE, NULL, NULL);
if (status) {
dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
return status;
@@ -987,8 +985,8 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (write->wr_offset >= OFFSET_MAX)
return nfserr_inval;
- status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
- stateid, WR_STATE, &filp, NULL);
+ status = nfs4_preprocess_stateid_op(rqstp, cstate, stateid, WR_STATE,
+ &filp, NULL);
if (status) {
dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
return status;
@@ -1018,15 +1016,15 @@ nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct file *src, *dst;
__be32 status;
- status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
- &clone->cl_src_stateid, RD_STATE,
- &src, NULL);
+ status = nfs4_preprocess_stateid_op(rqstp, cstate,
+ &clone->cl_src_stateid,
+ RD_STATE | SAVED_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,
+ status = nfs4_preprocess_stateid_op(rqstp, cstate,
&clone->cl_dst_stateid, WR_STATE,
&dst, NULL);
if (status) {
@@ -1059,7 +1057,7 @@ nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
__be32 status = nfserr_notsupp;
struct file *file;
- status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
+ status = nfs4_preprocess_stateid_op(rqstp, cstate,
&fallocate->falloc_stateid,
WR_STATE, &file, NULL);
if (status != nfs_ok) {
@@ -1098,7 +1096,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
__be32 status;
struct file *file;
- status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
+ status = nfs4_preprocess_stateid_op(rqstp, cstate,
&seek->seek_stateid,
RD_STATE, &file, NULL);
if (status) {
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index df5dba6..aea9504 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4797,10 +4797,11 @@ nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
*/
__be32
nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
- struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
- stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
+ struct nfsd4_compound_state *cstate, stateid_t *stateid,
+ int flags, struct file **filpp, bool *tmp_file)
{
- struct inode *ino = d_inode(fhp->fh_dentry);
+ struct svc_fh *fhp = &cstate->current_fh;
+ struct inode *ino;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfs4_stid *s = NULL;
@@ -4810,6 +4811,9 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
*filpp = NULL;
if (tmp_file)
*tmp_file = false;
+ if (flags & SAVED_STATE)
+ fhp = &cstate->save_fh;
+ ino = d_inode(fhp->fh_dentry);
if (grace_disallows_io(net, ino))
return nfserr_grace;
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 99432b7..c6c92bc 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -562,9 +562,10 @@ static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
return container_of(s, struct nfs4_layout_stateid, ls_stid);
}
-/* flags for preprocess_seqid_op() */
+/* flags for preprocess_seqid_op() and preprocess_stateid_op() */
#define RD_STATE 0x00000010
#define WR_STATE 0x00000020
+#define SAVED_STATE 0x00000040
enum nfsd4_cb_op {
NFSPROC4_CLNT_CB_NULL = 0,
@@ -578,8 +579,8 @@ struct nfsd4_compound_state;
struct nfsd_net;
extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
- struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
- stateid_t *stateid, int flags, struct file **filp, bool *tmp_file);
+ struct nfsd4_compound_state *cstate, stateid_t *stateid,
+ int flags, struct file **filp, bool *tmp_file);
__be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
stateid_t *stateid, unsigned char typemask,
struct nfs4_stid **s, struct nfsd_net *nn);
--
2.6.4
From: Anna Schumaker <[email protected]>
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 <[email protected]>
---
v2:
- Don't fsync() after copy
- Tell client that the result is NFS_UNSTABLE
- Fix conflicts with clone
---
fs/nfsd/nfs4proc.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++--------
fs/nfsd/nfs4xdr.c | 62 +++++++++++++++++++++++++++++++++--
fs/nfsd/vfs.c | 20 ++++++++++++
fs/nfsd/vfs.h | 1 +
fs/nfsd/xdr4.h | 23 +++++++++++++
5 files changed, 185 insertions(+), 15 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4fbc86b..4a76ba1 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1010,47 +1010,97 @@ 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)
+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,
- &clone->cl_src_stateid,
- RD_STATE | SAVED_STATE, &src, NULL);
+ status = nfs4_preprocess_stateid_op(rqstp, cstate, src_stateid,
+ RD_STATE | SAVED_STATE, src, NULL);
if (status) {
dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
goto out;
}
- status = nfs4_preprocess_stateid_op(rqstp, cstate,
- &clone->cl_dst_stateid, WR_STATE,
- &dst, NULL);
+ status = nfs4_preprocess_stateid_op(rqstp, cstate, 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_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)
{
@@ -1964,6 +2014,18 @@ static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd
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,
@@ -2326,6 +2388,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
.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 924416f..21a8e6b 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1694,6 +1694,30 @@ nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
}
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 @@ static nfsd4_dec nfsd4_dec_ops[] = {
/* 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,
@@ -4203,6 +4227,40 @@ nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
#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, err;
+
+ if (!nfserr) {
+ err = nfsd42_encode_write_res(resp, ©->cp_res);
+ if (err)
+ return err;
+
+ 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)
{
@@ -4301,7 +4359,7 @@ static nfsd4_enc nfsd4_enc_ops[] = {
/* 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 5411bf0..d25aeed 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -506,6 +506,26 @@ __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
count));
}
+ssize_t nfsd_copy_range(struct file *src, u64 src_pos,
+ struct file *dst, u64 dst_pos,
+ u64 count)
+{
+ //u64 limit = 0x800000; /* 4 MB */
+ //u64 limit = 0x1000000; /* 8 MB */
+ //u64 limit = 0x2000000; /* 16 MB */
+ //u64 limit = 0x4000000; /* 32 MB */
+ //u64 limit = 0x8000000; /* 64 MB */
+ //u64 limit = 0x10000000; /* 128 MB */
+ //u64 limit = 0x10000000; /* 256 MB */
+ //u64 limit = 0x20000000; /* 512 MB */
+ //u64 limit = 0x40000000; /* 1024 MB */
+ //u64 limit = 0x80000000; /* 2048 MB */
+
+ //if (count > limit)
+ // count = limit;
+ 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 c11ba31..e36c497 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -93,6 +93,7 @@ __be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *,
struct svc_fh *res);
__be32 nfsd_link(struct svc_rqst *, struct svc_fh *,
char *, int, struct svc_fh *);
+ssize_t nfsd_copy_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 d955481..2cad349 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -500,6 +500,28 @@ struct nfsd4_clone {
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;
@@ -565,6 +587,7 @@ struct nfsd4_op {
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;
--
2.6.4
This is a simple C program that I used for calling the copy system call.
Usage: ./nfscopy /nfs/original.txt /nfs/copy.txt
---
nfscopy.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
create mode 100644 nfscopy.c
diff --git a/nfscopy.c b/nfscopy.c
new file mode 100644
index 0000000..3417a14
--- /dev/null
+++ b/nfscopy.c
@@ -0,0 +1,59 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+loff_t copy_file_range(int fd_in, loff_t *off_in, int fd_out,
+ loff_t *off_out, size_t len, unsigned int flags)
+{
+ return syscall(__NR_copy_file_range, fd_in, off_in, fd_out,
+ off_out, len, flags);
+}
+
+int main(int argc, char **argv)
+{
+ int fd_in, fd_out;
+ struct stat stat;
+ loff_t len, ret;
+ char buf[2];
+
+ if (argc != 3) {
+ fprintf(stderr, "Usage: %s <source> <destination>\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ fd_in = open(argv[1], O_RDONLY);
+ if (fd_in == -1) {
+ perror("open (argv[1])");
+ exit(EXIT_FAILURE);
+ }
+
+ if (fstat(fd_in, &stat) == -1) {
+ perror("fstat");
+ exit(EXIT_FAILURE);
+ }
+ len = stat.st_size;
+
+ fd_out = open(argv[2], O_CREAT|O_WRONLY|O_TRUNC, 0644);
+ if (fd_out == -1) {
+ perror("open (argv[2])");
+ exit(EXIT_FAILURE);
+ }
+
+ do {
+ ret = copy_file_range(fd_in, NULL, fd_out, NULL, len, 0);
+ if (ret == -1) {
+ perror("copy_file_range");
+ exit(EXIT_FAILURE);
+ }
+
+ len -= ret;
+ } while (len > 0);
+
+ close(fd_in);
+ close(fd_out);
+ exit(EXIT_SUCCESS);
+}
--
2.6.4
From: Anna Schumaker <[email protected]>
This adds the copy_range file_ops function pointer used by the
sys_copy_range() function call. This patch only implements sync copies,
so if an async copy happens we decode the stateid and ignore it.
Signed-off-by: Anna Schumaker <[email protected]>
---
v2:
- Send a commit if the server tells us anything except NFS_FILE_SYNC
- Truncate the pagecache of the destination file
---
fs/nfs/nfs42.h | 1 +
fs/nfs/nfs42proc.c | 100 +++++++++++++++++++++++++++++++
fs/nfs/nfs42xdr.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4file.c | 23 ++++++++
fs/nfs/nfs4proc.c | 1 +
fs/nfs/nfs4xdr.c | 1 +
include/linux/nfs4.h | 1 +
include/linux/nfs_fs_sb.h | 1 +
include/linux/nfs_xdr.h | 27 +++++++++
9 files changed, 301 insertions(+)
diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h
index b587ccd..b6cd153 100644
--- a/fs/nfs/nfs42.h
+++ b/fs/nfs/nfs42.h
@@ -13,6 +13,7 @@
/* nfs4.2proc.c */
int nfs42_proc_allocate(struct file *, loff_t, loff_t);
+ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t);
int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
loff_t nfs42_proc_llseek(struct file *, loff_t, int);
int nfs42_proc_layoutstats_generic(struct nfs_server *,
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 6b1ce98..fb1531b 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -135,6 +135,106 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
return err;
}
+static int nfs42_proc_commit(struct file *file, loff_t pos, size_t count)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(file));
+ struct nfs_fattr *fattr = nfs_alloc_fattr();
+ struct nfs_writeverf verf;
+ struct nfs_commitargs args = {
+ .fh = NFS_FH(file_inode(file)),
+ .offset = pos,
+ .count = count,
+ };
+ struct nfs_commitres res = {
+ .server = server,
+ .fattr = fattr,
+ .verf = &verf,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ unsigned int status;
+
+ status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
+ &res.seq_res, 0);
+ nfs_free_fattr(fattr);
+ return status;
+}
+
+static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
+ struct file *dst, loff_t pos_dst,
+ size_t count)
+{
+ struct nfs42_copy_args args = {
+ .src_fh = NFS_FH(file_inode(src)),
+ .src_pos = pos_src,
+ .dst_fh = NFS_FH(file_inode(dst)),
+ .dst_pos = pos_dst,
+ .count = count,
+ };
+ struct nfs42_copy_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ struct inode *dst_inode = file_inode(dst);
+ struct nfs_server *server = NFS_SERVER(dst_inode);
+ int status;
+
+ status = nfs42_set_rw_stateid(&args.src_stateid, src, FMODE_READ);
+ if (status)
+ return status;
+
+ status = nfs42_set_rw_stateid(&args.dst_stateid, dst, FMODE_WRITE);
+ if (status)
+ return status;
+
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status == -ENOTSUPP)
+ server->caps &= ~NFS_CAP_COPY;
+ if (status)
+ return status;
+
+ truncate_pagecache_range(dst_inode, pos_dst,
+ pos_dst + res.write_res.count);
+
+ if (res.write_res.committed != NFS_FILE_SYNC) {
+ status = nfs42_proc_commit(dst, pos_dst, res.write_res.count);
+ if (status)
+ return status;
+ }
+
+ return res.write_res.count;
+}
+
+ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
+ struct file *dst, loff_t pos_dst,
+ size_t count)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(dst));
+ struct nfs4_exception exception = { };
+ ssize_t err;
+
+ if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
+ return -EOPNOTSUPP;
+
+ do {
+ mutex_lock(&file_inode(dst)->i_mutex);
+ err = _nfs42_proc_copy(src, pos_src, dst, pos_dst, count);
+ mutex_unlock(&file_inode(dst)->i_mutex);
+
+ if (err == -ENOTSUPP)
+ return -EOPNOTSUPP;
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+
+ return err;
+}
+
static loff_t _nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
{
struct inode *inode = file_inode(filep);
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 0ca482a..dd4a974 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -9,9 +9,22 @@
#define encode_fallocate_maxsz (encode_stateid_maxsz + \
2 /* offset */ + \
2 /* length */)
+#define NFS42_WRITE_RES_SIZE (1 /* wr_callback_id size */ +\
+ XDR_QUADLEN(NFS4_STATEID_SIZE) + \
+ 2 /* wr_count */ + \
+ 1 /* wr_committed */ + \
+ XDR_QUADLEN(NFS4_VERIFIER_SIZE))
#define encode_allocate_maxsz (op_encode_hdr_maxsz + \
encode_fallocate_maxsz)
#define decode_allocate_maxsz (op_decode_hdr_maxsz)
+#define encode_copy_maxsz (op_encode_hdr_maxsz + \
+ XDR_QUADLEN(NFS4_STATEID_SIZE) + \
+ XDR_QUADLEN(NFS4_STATEID_SIZE) + \
+ 2 + 2 + 2 + 1 + 1 + 1)
+#define decode_copy_maxsz (op_decode_hdr_maxsz + \
+ NFS42_WRITE_RES_SIZE + \
+ 1 /* cr_consecutive */ + \
+ 1 /* cr_synchronous */)
#define encode_deallocate_maxsz (op_encode_hdr_maxsz + \
encode_fallocate_maxsz)
#define decode_deallocate_maxsz (op_decode_hdr_maxsz)
@@ -49,6 +62,16 @@
decode_putfh_maxsz + \
decode_allocate_maxsz + \
decode_getattr_maxsz)
+#define NFS4_enc_copy_sz (compound_encode_hdr_maxsz + \
+ encode_putfh_maxsz + \
+ encode_savefh_maxsz + \
+ encode_putfh_maxsz + \
+ encode_copy_maxsz)
+#define NFS4_dec_copy_sz (compound_decode_hdr_maxsz + \
+ decode_putfh_maxsz + \
+ decode_savefh_maxsz + \
+ decode_putfh_maxsz + \
+ decode_copy_maxsz)
#define NFS4_enc_deallocate_sz (compound_encode_hdr_maxsz + \
encode_putfh_maxsz + \
encode_deallocate_maxsz + \
@@ -102,6 +125,23 @@ static void encode_allocate(struct xdr_stream *xdr,
encode_fallocate(xdr, args);
}
+static void encode_copy(struct xdr_stream *xdr,
+ struct nfs42_copy_args *args,
+ struct compound_hdr *hdr)
+{
+ encode_op_hdr(xdr, OP_COPY, decode_copy_maxsz, hdr);
+ encode_nfs4_stateid(xdr, &args->src_stateid);
+ encode_nfs4_stateid(xdr, &args->dst_stateid);
+
+ encode_uint64(xdr, args->src_pos);
+ encode_uint64(xdr, args->dst_pos);
+ encode_uint64(xdr, args->count);
+
+ encode_uint32(xdr, 1); /* consecutive = true */
+ encode_uint32(xdr, 1); /* synchronous = true */
+ encode_uint32(xdr, 0); /* src server list */
+}
+
static void encode_deallocate(struct xdr_stream *xdr,
struct nfs42_falloc_args *args,
struct compound_hdr *hdr)
@@ -182,6 +222,26 @@ static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
}
/*
+ * Encode COPY request
+ */
+static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
+ struct xdr_stream *xdr,
+ struct nfs42_copy_args *args)
+{
+ struct compound_hdr hdr = {
+ .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+ };
+
+ encode_compound_hdr(xdr, req, &hdr);
+ encode_sequence(xdr, &args->seq_args, &hdr);
+ encode_putfh(xdr, args->src_fh, &hdr);
+ encode_savefh(xdr, &hdr);
+ encode_putfh(xdr, args->dst_fh, &hdr);
+ encode_copy(xdr, args, &hdr);
+ encode_nops(&hdr);
+}
+
+/*
* Encode DEALLOCATE request
*/
static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
@@ -266,6 +326,62 @@ static int decode_allocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
return decode_op_hdr(xdr, OP_ALLOCATE);
}
+static int decode_write_response(struct xdr_stream *xdr,
+ struct nfs42_write_res *res)
+{
+ __be32 *p;
+ int stateids;
+
+ p = xdr_inline_decode(xdr, 4 + 8 + 4);
+ if (unlikely(!p))
+ goto out_overflow;
+
+ stateids = be32_to_cpup(p++);
+ p = xdr_decode_hyper(p, &res->count);
+ res->committed = be32_to_cpup(p);
+ return decode_verifier(xdr, &res->verifier);
+
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+static int decode_copy_requirements(struct xdr_stream *xdr,
+ struct nfs42_copy_res *res) {
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4 + 4);
+ if (unlikely(!p))
+ goto out_overflow;
+
+ res->consecutive = be32_to_cpup(p++);
+ res->synchronous = be32_to_cpup(p++);
+ return 0;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+static int decode_copy(struct xdr_stream *xdr, struct nfs42_copy_res *res)
+{
+ int status;
+
+ status = decode_op_hdr(xdr, OP_COPY);
+ if (status == NFS4ERR_OFFLOAD_NO_REQS) {
+ status = decode_copy_requirements(xdr, res);
+ if (status)
+ return status;
+ return NFS4ERR_OFFLOAD_NO_REQS;
+ } else if (status)
+ return status;
+
+ status = decode_write_response(xdr, &res->write_res);
+ if (status)
+ return status;
+
+ return decode_copy_requirements(xdr, res);
+}
+
static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
{
return decode_op_hdr(xdr, OP_DEALLOCATE);
@@ -331,6 +447,36 @@ out:
}
/*
+ * Decode COPY response
+ */
+static int nfs4_xdr_dec_copy(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ struct nfs42_copy_res *res)
+{
+ struct compound_hdr hdr;
+ int status;
+
+ status = decode_compound_hdr(xdr, &hdr);
+ if (status)
+ goto out;
+ status = decode_sequence(xdr, &res->seq_res, rqstp);
+ if (status)
+ goto out;
+ status = decode_putfh(xdr);
+ if (status)
+ goto out;
+ status = decode_savefh(xdr);
+ if (status)
+ goto out;
+ status = decode_putfh(xdr);
+ if (status)
+ goto out;
+ status = decode_copy(xdr, res);
+out:
+ return status;
+}
+
+/*
* Decode DEALLOCATE request
*/
static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 26f9a23..f3b4783 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -160,6 +160,28 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
}
#ifdef CONFIG_NFS_V4_2
+static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t count, unsigned int flags)
+{
+ struct inode *in_inode = file_inode(file_in);
+ struct inode *out_inode = file_inode(file_out);
+ int ret;
+
+ if (in_inode == out_inode)
+ return -EINVAL;
+
+ /* flush any pending writes */
+ ret = nfs_sync_inode(in_inode);
+ if (ret)
+ return ret;
+ ret = nfs_sync_inode(out_inode);
+ if (ret)
+ return ret;
+
+ return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
+}
+
static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
{
loff_t ret;
@@ -274,6 +296,7 @@ const struct file_operations nfs4_file_operations = {
.check_flags = nfs_check_flags,
.setlease = simple_nosetlease,
#ifdef CONFIG_NFS_V4_2
+ .copy_file_range = nfs4_copy_file_range,
.llseek = nfs4_file_llseek,
.fallocate = nfs42_fallocate,
.clone_file_range = nfs42_clone_file_range,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c57d133..03ac2ea 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8706,6 +8706,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
| NFS_CAP_STATEID_NFSV41
| NFS_CAP_ATOMIC_OPEN_V1
| NFS_CAP_ALLOCATE
+ | NFS_CAP_COPY
| NFS_CAP_DEALLOCATE
| NFS_CAP_SEEK
| NFS_CAP_LAYOUTSTATS
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 4e44412..bc3a3f5 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -7515,6 +7515,7 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(DEALLOCATE, enc_deallocate, dec_deallocate),
PROC(LAYOUTSTATS, enc_layoutstats, dec_layoutstats),
PROC(CLONE, enc_clone, dec_clone),
+ PROC(COPY, enc_copy, dec_copy),
#endif /* CONFIG_NFS_V4_2 */
};
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 43aeabd..3cddc5e 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -504,6 +504,7 @@ enum {
NFSPROC4_CLNT_DEALLOCATE,
NFSPROC4_CLNT_LAYOUTSTATS,
NFSPROC4_CLNT_CLONE,
+ NFSPROC4_CLNT_COPY,
};
/* nfs41 types */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 2469ab0..8b772ca 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -245,5 +245,6 @@ struct nfs_server {
#define NFS_CAP_DEALLOCATE (1U << 21)
#define NFS_CAP_LAYOUTSTATS (1U << 22)
#define NFS_CAP_CLONE (1U << 23)
+#define NFS_CAP_COPY (1U << 24)
#endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 11bbae4..304b8e4 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1342,6 +1342,33 @@ struct nfs42_falloc_res {
const struct nfs_server *falloc_server;
};
+struct nfs42_copy_args {
+ struct nfs4_sequence_args seq_args;
+
+ struct nfs_fh *src_fh;
+ nfs4_stateid src_stateid;
+ u64 src_pos;
+
+ struct nfs_fh *dst_fh;
+ nfs4_stateid dst_stateid;
+ u64 dst_pos;
+
+ u64 count;
+};
+
+struct nfs42_write_res {
+ u64 count;
+ u32 committed;
+ nfs4_verifier verifier;
+};
+
+struct nfs42_copy_res {
+ struct nfs4_sequence_res seq_res;
+ struct nfs42_write_res write_res;
+ bool consecutive;
+ bool synchronous;
+};
+
struct nfs42_seek_args {
struct nfs4_sequence_args seq_args;
--
2.6.4
On Fri, Dec 18, 2015 at 04:05:24PM -0500, Anna Schumaker wrote:
> This reverts commit 3679e4c1ef1c00ea30d15b9ae59089b44dfe4137.
>
> We either pass the current_fh or save_fh from the cstate structure, and
> not some generic filehandle. Let's just add a flag to pick between these
> two filehandles instead.
>
> Signed-off-by: Anna Schumaker <[email protected]>
I don't really find this much cleaner to be honest.
> fs/nfs/objlayout/Makefile | 0
how did this end up in the diffstat, btw?
> +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)
I'm not really sold on a helper for two function calls and a simple
conditional. I'm also not totally against it, though.
> + 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);
please stick to 80 characters per line.
> +
> +static __be32
> +nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
> + struct nfsd4_copy *copy)
> +{
> + __be32 *p, err;
> +
> + if (!nfserr) {
> + err = nfsd42_encode_write_res(resp, ©->cp_res);
> + if (err)
> + return err;
> +
> + p = xdr_reserve_space(&resp->xdr, 4 + 4);
> + *p++ = cpu_to_be32(copy->cp_consecutive);
> + *p++ = cpu_to_be32(copy->cp_synchronous);
> + }
> + return nfserr;
seems lke the err variable is redundant and you could just use nfserr.
> +ssize_t nfsd_copy_range(struct file *src, u64 src_pos,
> + struct file *dst, u64 dst_pos,
> + u64 count)
the prototype would easily fit on two lines.
> +{
> + //u64 limit = 0x800000; /* 4 MB */
> + //u64 limit = 0x1000000; /* 8 MB */
> + //u64 limit = 0x2000000; /* 16 MB */
> + //u64 limit = 0x4000000; /* 32 MB */
> + //u64 limit = 0x8000000; /* 64 MB */
> + //u64 limit = 0x10000000; /* 128 MB */
> + //u64 limit = 0x10000000; /* 256 MB */
> + //u64 limit = 0x20000000; /* 512 MB */
> + //u64 limit = 0x40000000; /* 1024 MB */
> + //u64 limit = 0x80000000; /* 2048 MB */
> +
> + //if (count > limit)
> + // count = limit;
This looks like odd left over debug code. Note that vfs_copy_file_range
has a size_t limit, so we might need some explicit handling here instead
of silent truncation.
> + if (res.write_res.committed != NFS_FILE_SYNC) {
> + status = nfs42_proc_commit(dst, pos_dst, res.write_res.count);
> + if (status)
> + return status;
> + }
Do we really expect data to be stabe on disk after a copy_file_range?
Seems like the page cache variant doesn't guarantee that, and it would
also be different from all other I/O syscalls.
Either way we will probably need to document the assumptions in the man
page.
On 12/20/2015 10:45 AM, Christoph Hellwig wrote:
> On Fri, Dec 18, 2015 at 04:05:24PM -0500, Anna Schumaker wrote:
>> This reverts commit 3679e4c1ef1c00ea30d15b9ae59089b44dfe4137.
>>
>> We either pass the current_fh or save_fh from the cstate structure, and
>> not some generic filehandle. Let's just add a flag to pick between these
>> two filehandles instead.
>>
>> Signed-off-by: Anna Schumaker <[email protected]>
>
> I don't really find this much cleaner to be honest.
Okay, I'll drop this patch.
>
>> fs/nfs/objlayout/Makefile | 0
>
> how did this end up in the diffstat, btw?
My git trees just really wanted to make sure that it's there? This change should go away when I remove the patch.
Anna
>
On 12/20/2015 10:50 AM, Christoph Hellwig wrote:
>> +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)
>
> I'm not really sold on a helper for two function calls and a simple
> conditional. I'm also not totally against it, though.
I'm planning to keep the helper, since it's still a big chunk of code that would otherwise need to be duplicated.
>
>> + 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);
>
> please stick to 80 characters per line.
Okay.
>
>> +
>> +static __be32
>> +nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
>> + struct nfsd4_copy *copy)
>> +{
>> + __be32 *p, err;
>> +
>> + if (!nfserr) {
>> + err = nfsd42_encode_write_res(resp, ©->cp_res);
>> + if (err)
>> + return err;
>> +
>> + p = xdr_reserve_space(&resp->xdr, 4 + 4);
>> + *p++ = cpu_to_be32(copy->cp_consecutive);
>> + *p++ = cpu_to_be32(copy->cp_synchronous);
>> + }
>> + return nfserr;
>
> seems lke the err variable is redundant and you could just use nfserr.
Sure.
>
>> +ssize_t nfsd_copy_range(struct file *src, u64 src_pos,
>> + struct file *dst, u64 dst_pos,
>> + u64 count)
>
> the prototype would easily fit on two lines.
Fixed.
>
>> +{
>> + //u64 limit = 0x800000; /* 4 MB */
>> + //u64 limit = 0x1000000; /* 8 MB */
>> + //u64 limit = 0x2000000; /* 16 MB */
>> + //u64 limit = 0x4000000; /* 32 MB */
>> + //u64 limit = 0x8000000; /* 64 MB */
>> + //u64 limit = 0x10000000; /* 128 MB */
>> + //u64 limit = 0x10000000; /* 256 MB */
>> + //u64 limit = 0x20000000; /* 512 MB */
>> + //u64 limit = 0x40000000; /* 1024 MB */
>> + //u64 limit = 0x80000000; /* 2048 MB */
>> +
>> + //if (count > limit)
>> + // count = limit;
>
> This looks like odd left over debug code. Note that vfs_copy_file_range
> has a size_t limit, so we might need some explicit handling here instead
> of silent truncation.
Yeah, I meant to remove that before submitting. I think an unstable reply works better than a silent (and arbitrary) truncate.
Anna
>
On 12/20/2015 10:53 AM, Christoph Hellwig wrote:
>> + if (res.write_res.committed != NFS_FILE_SYNC) {
>> + status = nfs42_proc_commit(dst, pos_dst, res.write_res.count);
>> + if (status)
>> + return status;
>> + }
>
> Do we really expect data to be stabe on disk after a copy_file_range?
> Seems like the page cache variant doesn't guarantee that, and it would
> also be different from all other I/O syscalls.
It doesn't have to be, I just couldn't figure out how to mark the range as "needs commit" for the next time somebody runs fsync().
Anna
>
> Either way we will probably need to document the assumptions in the man
> page.
>