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NFSD: Free async copy information in nfsd4_cb_offload_release()

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RFC 7862 Section 4.8 states:

> A copy offload stateid will be valid until either (A) the client
> or server restarts or (B) the client returns the resource by
> issuing an OFFLOAD_CANCEL operation or the client replies to a
> CB_OFFLOAD operation.

Currently, NFSD purges the metadata for an async COPY operation as
soon as the CB_OFFLOAD callback has been sent. It does not wait even
for the client's CB_OFFLOAD response, as the paragraph above
suggests that it should.

This makes the OFFLOAD_STATUS operation ineffective during the
window between the completion of an asynchronous COPY and the
server's receipt of the corresponding CB_OFFLOAD response. This is
important if, for example, the client responds with NFS4ERR_DELAY,
or the transport is lost before the server receives the response. A
client might use OFFLOAD_STATUS to query the server about the still
pending asynchronous COPY, but NFSD will respond to OFFLOAD_STATUS
as if it had never heard of the presented copy stateid.

This patch starts to address this issue by extending the lifetime of
struct nfsd4_copy at least until the server has seen the client's
CB_OFFLOAD response, or the CB_OFFLOAD has timed out.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2024-10-31 09:40:04 -04:00
parent 62a8642ba0
commit 409d6f52bd
2 changed files with 13 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

17
fs/nfsd/nfs4proc.c
View file

@ -57,6 +57,8 @@ module_param(inter_copy_offload_enable, bool, 0644);
MODULE_PARM_DESC(inter_copy_offload_enable,
"Enable inter server to server copy offload. Default: false");
static void cleanup_async_copy(struct nfsd4_copy *copy);
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
static int nfsd4_ssc_umount_timeout = 900000; /* default to 15 mins */
module_param(nfsd4_ssc_umount_timeout, int, 0644);
@ -1602,8 +1604,10 @@ static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
{
struct nfsd4_cb_offload *cbo =
container_of(cb, struct nfsd4_cb_offload, co_cb);
struct nfsd4_copy *copy =
container_of(cbo, struct nfsd4_copy, cp_cb_offload);
kfree(cbo);
cleanup_async_copy(copy);
}
static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
@ -1736,11 +1740,7 @@ static void cleanup_async_copy(struct nfsd4_copy *copy)
static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
{
struct nfsd4_cb_offload *cbo;
cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
if (!cbo)
return;
struct nfsd4_cb_offload *cbo = &copy->cp_cb_offload;
memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
@ -1790,10 +1790,13 @@ static int nfsd4_do_async_copy(void *data)
}
do_callback:
/* The kthread exits forthwith. Ensure that a subsequent
* OFFLOAD_CANCEL won't try to kill it again. */
set_bit(NFSD4_COPY_F_STOPPED, &copy->cp_flags);
set_bit(NFSD4_COPY_F_COMPLETED, &copy->cp_flags);
trace_nfsd_copy_async_done(copy);
nfsd4_send_cb_offload(copy);
cleanup_async_copy(copy);
return 0;
}

3
fs/nfsd/xdr4.h
View file

@ -700,6 +700,9 @@ struct nfsd4_copy {
struct nfsd42_write_res cp_res;
struct knfsd_fh fh;
/* offload callback */
struct nfsd4_cb_offload cp_cb_offload;
struct nfs4_client *cp_clp;
struct nfsd_file *nf_src;