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NFS client bugfixes for 4.8

Browse Source 
Highlights include:
 
 Stable patches:
 - We must serialise LAYOUTGET and LAYOUTRETURN to ensure correct state
   accounting
 - Fix the CREATE_SESSION slot number
 
 Bugfixes:
 - sunrpc: fix a UDP memory accounting regression
 - NFS: Fix an error reporting regression in nfs_file_write()
 - pNFS: Fix further layout stateid issues
 - RPC/rdma: Revert 3d4cf35bd4 ("xprtrdma: Reply buffer exhaustion...")
 - RPC/rdma: Fix receive buffer accounting
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Merge tag 'nfs-for-4.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Stable patches:
   - We must serialise LAYOUTGET and LAYOUTRETURN to ensure correct
     state accounting
   - Fix the CREATE_SESSION slot number

  Bugfixes:
   - sunrpc: fix a UDP memory accounting regression
   - NFS: Fix an error reporting regression in nfs_file_write()
   - pNFS: Fix further layout stateid issues
   - RPC/rdma: Revert 3d4cf35bd4 ("xprtrdma: Reply buffer
     exhaustion...")
   - RPC/rdma: Fix receive buffer accounting"

* tag 'nfs-for-4.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4.1: Fix the CREATE_SESSION slot number accounting
  xprtrdma: Fix receive buffer accounting
  xprtrdma: Revert 3d4cf35bd4 ("xprtrdma: Reply buffer exhaustion...")
  pNFS: Don't forget the layout stateid if there are outstanding LAYOUTGETs
  pNFS: Clear out all layout segments if the server unsets lrp->res.lrs_present
  pNFS: Fix pnfs_set_layout_stateid() to clear NFS_LAYOUT_INVALID_STID
  pNFS: Ensure LAYOUTGET and LAYOUTRETURN are properly serialised
  NFS: Fix error reporting in nfs_file_write()
  sunrpc: fix UDP memory accounting
This commit is contained in:
Linus Torvalds 2016-09-12 14:13:45 -07:00
commit 2c937eb4dd
6 changed files with 78 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/nfs/file.c
View File

@ -657,7 +657,10 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
if (result <= 0)
goto out;
written = generic_write_sync(iocb, result);
result = generic_write_sync(iocb, result);
if (result < 0)
goto out;
written = result;
iocb->ki_pos += written;
/* Return error values */

21
fs/nfs/nfs4proc.c
View File

@ -7570,12 +7570,20 @@ static int _nfs4_proc_create_session(struct nfs_client *clp,
status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
trace_nfs4_create_session(clp, status);
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
case -NFS4ERR_DELAY:
case -ETIMEDOUT:
case -EACCES:
case -EAGAIN:
goto out;
};
clp->cl_seqid++;
if (!status) {
/* Verify the session's negotiated channel_attrs values */
status = nfs4_verify_channel_attrs(&args, &res);
/* Increment the clientid slot sequence id */
if (clp->cl_seqid == res.seqid)
clp->cl_seqid++;
if (status)
goto out;
nfs4_update_session(session, &res);
@ -8190,10 +8198,13 @@ static void nfs4_layoutreturn_release(void *calldata)
dprintk("--> %s\n", __func__);
spin_lock(&lo->plh_inode->i_lock);
pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range,
be32_to_cpu(lrp->args.stateid.seqid));
if (lrp->res.lrs_present && pnfs_layout_is_valid(lo))
if (lrp->res.lrs_present) {
pnfs_mark_matching_lsegs_invalid(lo, &freeme,
&lrp->args.range,
be32_to_cpu(lrp->args.stateid.seqid));
pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
} else
pnfs_mark_layout_stateid_invalid(lo, &freeme);
pnfs_clear_layoutreturn_waitbit(lo);
spin_unlock(&lo->plh_inode->i_lock);
nfs4_sequence_free_slot(&lrp->res.seq_res);

42
fs/nfs/pnfs.c
View File

@ -365,7 +365,8 @@ pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
atomic_dec(&lo->plh_refcount);
if (list_empty(&lo->plh_segs)) {
set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
if (atomic_read(&lo->plh_outstanding) == 0)
set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
}
rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
@ -768,17 +769,32 @@ pnfs_destroy_all_layouts(struct nfs_client *clp)
pnfs_destroy_layouts_byclid(clp, false);
}
static void
pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
{
lo->plh_return_iomode = 0;
lo->plh_return_seq = 0;
clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
}
/* update lo->plh_stateid with new if is more recent */
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
bool update_barrier)
{
u32 oldseq, newseq, new_barrier = 0;
bool invalid = !pnfs_layout_is_valid(lo);
oldseq = be32_to_cpu(lo->plh_stateid.seqid);
newseq = be32_to_cpu(new->seqid);
if (invalid || pnfs_seqid_is_newer(newseq, oldseq)) {
if (!pnfs_layout_is_valid(lo)) {
nfs4_stateid_copy(&lo->plh_stateid, new);
lo->plh_barrier = newseq;
pnfs_clear_layoutreturn_info(lo);
clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
return;
}
if (pnfs_seqid_is_newer(newseq, oldseq)) {
nfs4_stateid_copy(&lo->plh_stateid, new);
/*
* Because of wraparound, we want to keep the barrier
@ -790,7 +806,7 @@ pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
new_barrier = be32_to_cpu(new->seqid);
else if (new_barrier == 0)
return;
if (invalid || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
lo->plh_barrier = new_barrier;
}
@ -886,19 +902,14 @@ void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
}
static void
pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
{
lo->plh_return_iomode = 0;
lo->plh_return_seq = 0;
clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
}
static bool
pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
nfs4_stateid *stateid,
enum pnfs_iomode *iomode)
{
/* Serialise LAYOUTGET/LAYOUTRETURN */
if (atomic_read(&lo->plh_outstanding) != 0)
return false;
if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
return false;
pnfs_get_layout_hdr(lo);
@ -1798,16 +1809,11 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
*/
pnfs_mark_layout_stateid_invalid(lo, &free_me);
nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
pnfs_set_layout_stateid(lo, &res->stateid, true);
}
pnfs_get_lseg(lseg);
pnfs_layout_insert_lseg(lo, lseg, &free_me);
if (!pnfs_layout_is_valid(lo)) {
pnfs_clear_layoutreturn_info(lo);
clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
}
if (res->return_on_close)

45
net/sunrpc/xprtrdma/verbs.c
View File

@ -51,6 +51,7 @@
#include <linux/slab.h>
#include <linux/prefetch.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/svc_rdma.h>
#include <asm/bitops.h>
#include <linux/module.h> /* try_module_get()/module_put() */
@ -923,7 +924,7 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
}
INIT_LIST_HEAD(&buf->rb_recv_bufs);
for (i = 0; i < buf->rb_max_requests; i++) {
for (i = 0; i < buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; i++) {
struct rpcrdma_rep *rep;
rep = rpcrdma_create_rep(r_xprt);
@ -1018,6 +1019,7 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
rep = rpcrdma_buffer_get_rep_locked(buf);
rpcrdma_destroy_rep(ia, rep);
}
buf->rb_send_count = 0;
spin_lock(&buf->rb_reqslock);
while (!list_empty(&buf->rb_allreqs)) {
@ -1032,6 +1034,7 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
spin_lock(&buf->rb_reqslock);
}
spin_unlock(&buf->rb_reqslock);
buf->rb_recv_count = 0;
rpcrdma_destroy_mrs(buf);
}
@ -1074,8 +1077,27 @@ rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
spin_unlock(&buf->rb_mwlock);
}
static struct rpcrdma_rep *
rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers)
{
/* If an RPC previously completed without a reply (say, a
* credential problem or a soft timeout occurs) then hold off
* on supplying more Receive buffers until the number of new
* pending RPCs catches up to the number of posted Receives.
*/
if (unlikely(buffers->rb_send_count < buffers->rb_recv_count))
return NULL;
if (unlikely(list_empty(&buffers->rb_recv_bufs)))
return NULL;
buffers->rb_recv_count++;
return rpcrdma_buffer_get_rep_locked(buffers);
}
/*
* Get a set of request/reply buffers.
*
* Reply buffer (if available) is attached to send buffer upon return.
*/
struct rpcrdma_req *
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
@ -1085,21 +1107,15 @@ rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
spin_lock(&buffers->rb_lock);
if (list_empty(&buffers->rb_send_bufs))
goto out_reqbuf;
buffers->rb_send_count++;
req = rpcrdma_buffer_get_req_locked(buffers);
if (list_empty(&buffers->rb_recv_bufs))
goto out_repbuf;
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
spin_unlock(&buffers->rb_lock);
return req;
out_reqbuf:
spin_unlock(&buffers->rb_lock);
pr_warn("rpcrdma: out of request buffers (%p)\n", buffers);
return NULL;
out_repbuf:
list_add(&req->rl_free, &buffers->rb_send_bufs);
spin_unlock(&buffers->rb_lock);
pr_warn("rpcrdma: out of reply buffers (%p)\n", buffers);
pr_warn("RPC: %s: out of request buffers\n", __func__);
return NULL;
}
@ -1117,9 +1133,12 @@ rpcrdma_buffer_put(struct rpcrdma_req *req)
req->rl_reply = NULL;
spin_lock(&buffers->rb_lock);
buffers->rb_send_count--;
list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
if (rep)
if (rep) {
buffers->rb_recv_count--;
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
}
spin_unlock(&buffers->rb_lock);
}
@ -1133,8 +1152,7 @@ rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
struct rpcrdma_buffer *buffers = req->rl_buffer;
spin_lock(&buffers->rb_lock);
if (!list_empty(&buffers->rb_recv_bufs))
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
spin_unlock(&buffers->rb_lock);
}
@ -1148,6 +1166,7 @@ rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
spin_lock(&buffers->rb_lock);
buffers->rb_recv_count--;
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
spin_unlock(&buffers->rb_lock);
}

1
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -321,6 +321,7 @@ struct rpcrdma_buffer {
char *rb_pool;
spinlock_t rb_lock; /* protect buf lists */
int rb_send_count, rb_recv_count;
struct list_head rb_send_bufs;
struct list_head rb_recv_bufs;
u32 rb_max_requests;

2
net/sunrpc/xprtsock.c
View File

@ -1074,7 +1074,7 @@ static void xs_udp_data_receive(struct sock_xprt *transport)
skb = skb_recv_datagram(sk, 0, 1, &err);
if (skb != NULL) {
xs_udp_data_read_skb(&transport->xprt, sk, skb);
skb_free_datagram(sk, skb);
skb_free_datagram_locked(sk, skb);
continue;
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))