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NFS: Add COPY nfs operation 

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 <bjschuma@netapp.com>
This commit is contained in:
Anna Schumaker 2013-05-21 16:53:03 -04:00 committed by Anna Schumaker
parent 67911c8f18
commit 2e72448b07
9 changed files with 305 additions and 0 deletions
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1
fs/nfs/nfs42.h
View File

@ -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 *,

105
fs/nfs/nfs42proc.c
View File

@ -126,6 +126,111 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
return err;
}
static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
struct nfs_lock_context *src_lock,
struct file *dst, loff_t pos_dst,
struct nfs_lock_context *dst_lock,
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 = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
src_lock, FMODE_READ);
if (status)
return status;
status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
dst_lock, 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;
if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
if (status)
return status;
}
truncate_pagecache_range(dst_inode, pos_dst,
pos_dst + res.write_res.count);
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 nfs_lock_context *src_lock;
struct nfs_lock_context *dst_lock;
struct nfs4_exception src_exception = { };
struct nfs4_exception dst_exception = { };
ssize_t err, err2;
if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
return -EOPNOTSUPP;
src_lock = nfs_get_lock_context(nfs_file_open_context(src));
if (IS_ERR(src_lock))
return PTR_ERR(src_lock);
src_exception.inode = file_inode(src);
src_exception.state = src_lock->open_context->state;
dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
if (IS_ERR(dst_lock)) {
err = PTR_ERR(dst_lock);
goto out_put_src_lock;
}
dst_exception.inode = file_inode(dst);
dst_exception.state = dst_lock->open_context->state;
do {
mutex_lock(&file_inode(dst)->i_mutex);
err = _nfs42_proc_copy(src, pos_src, src_lock,
dst, pos_dst, dst_lock, count);
mutex_unlock(&file_inode(dst)->i_mutex);
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;
}
err2 = nfs4_handle_exception(server, err, &src_exception);
err = nfs4_handle_exception(server, err, &dst_exception);
if (!err)
err = err2;
} while (src_exception.retry || dst_exception.retry);
nfs_put_lock_context(dst_lock);
out_put_src_lock:
nfs_put_lock_context(src_lock);
return err;
}
static loff_t _nfs42_proc_llseek(struct file *filep,
struct nfs_lock_context *lock, loff_t offset, int whence)
{

146
fs/nfs/nfs42xdr.c
View File

@ -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)
@ -181,6 +221,26 @@ static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
encode_nops(&hdr);
}
/*
* 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
*/
@ -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->verifier.committed = be32_to_cpup(p);
return decode_verifier(xdr, &res->verifier.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);
@ -330,6 +446,36 @@ out:
return status;
}
/*
* 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
*/

23
fs/nfs/nfs4file.c
View File

@ -129,6 +129,28 @@ nfs4_file_flush(struct file *file, fl_owner_t id)
}
#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;
@ -243,6 +265,7 @@ 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,

1
fs/nfs/nfs4proc.c
View File

@ -8797,6 +8797,7 @@ 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

1
fs/nfs/nfs4xdr.c
View File

@ -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 */
};

1
include/linux/nfs4.h
View File

@ -504,6 +504,7 @@ enum {
NFSPROC4_CLNT_DEALLOCATE,
NFSPROC4_CLNT_LAYOUTSTATS,
NFSPROC4_CLNT_CLONE,
NFSPROC4_CLNT_COPY,
};
/* nfs41 types */

1
include/linux/nfs_fs_sb.h
View File

@ -246,5 +246,6 @@ 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

26
include/linux/nfs_xdr.h
View File

@ -1343,6 +1343,32 @@ 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;
struct nfs_writeverf 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;