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Subject[PATCH 4.10 139/167] NFSv4: Fix reboot recovery in copy offload
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit 9d8cacbf5636657d2cd0dda17438a56d806d3224 upstream.

Copy offload code needs to be hooked into the code for handling
NFS4ERR_BAD_STATEID by ensuring that we set the "stateid" field
in struct nfs4_exception.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Fixes: 2e72448b07dc3 ("NFS: Add COPY nfs operation")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/nfs42proc.c | 63 +++++++++++++++++++++++++++++++----------------------
1 file changed, 37 insertions(+), 26 deletions(-)

--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -128,30 +128,26 @@ out_unlock:
return err;
}

-static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
+static ssize_t _nfs42_proc_copy(struct file *src,
struct nfs_lock_context *src_lock,
- struct file *dst, loff_t pos_dst,
+ struct file *dst,
struct nfs_lock_context *dst_lock,
- size_t count)
+ struct nfs42_copy_args *args,
+ struct nfs42_copy_res *res)
{
- 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,
+ .rpc_argp = args,
+ .rpc_resp = res,
};
struct inode *dst_inode = file_inode(dst);
struct nfs_server *server = NFS_SERVER(dst_inode);
+ loff_t pos_src = args->src_pos;
+ loff_t pos_dst = args->dst_pos;
+ size_t count = args->count;
int status;

- status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
+ status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
src_lock, FMODE_READ);
if (status)
return status;
@@ -161,7 +157,7 @@ static ssize_t _nfs42_proc_copy(struct f
if (status)
return status;

- status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
+ status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
dst_lock, FMODE_WRITE);
if (status)
return status;
@@ -171,22 +167,22 @@ static ssize_t _nfs42_proc_copy(struct f
return status;

status = nfs4_call_sync(server->client, server, &msg,
- &args.seq_args, &res.seq_res, 0);
+ &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 (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);
+ pos_dst + res->write_res.count);

- return res.write_res.count;
+ return res->write_res.count;
}

ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
@@ -196,8 +192,22 @@ ssize_t nfs42_proc_copy(struct file *src
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 = { };
+ 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 nfs4_exception src_exception = {
+ .inode = file_inode(src),
+ .stateid = &args.src_stateid,
+ };
+ struct nfs4_exception dst_exception = {
+ .inode = file_inode(dst),
+ .stateid = &args.dst_stateid,
+ };
ssize_t err, err2;

if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
@@ -207,7 +217,6 @@ ssize_t nfs42_proc_copy(struct file *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));
@@ -216,15 +225,17 @@ ssize_t nfs42_proc_copy(struct file *src
goto out_put_src_lock;
}

- dst_exception.inode = file_inode(dst);
dst_exception.state = dst_lock->open_context->state;

do {
inode_lock(file_inode(dst));
- err = _nfs42_proc_copy(src, pos_src, src_lock,
- dst, pos_dst, dst_lock, count);
+ err = _nfs42_proc_copy(src, src_lock,
+ dst, dst_lock,
+ &args, &res);
inode_unlock(file_inode(dst));

+ if (err >= 0)
+ break;
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;

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