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pNFS/flexfiles: Fix layoutstats handling during read failovers 

During a read failover, we may end up changing the value of
the pgio_mirror_idx, so make sure that we record the layout
stats before that update.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-03-22 23:03:56 -04:00
parent 5a69824393
commit 166bd5b889
1 changed files with 4 additions and 1 deletions
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5
fs/nfs/flexfilelayout/flexfilelayout.c
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@ -1289,6 +1289,7 @@ static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
static int ff_layout_read_done_cb(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
int new_idx = hdr->pgio_mirror_idx;
int err;
trace_nfs4_pnfs_read(hdr, task->tk_status);
@ -1307,7 +1308,7 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
case -NFS4ERR_RESET_TO_PNFS:
if (ff_layout_choose_best_ds_for_read(hdr->lseg,
hdr->pgio_mirror_idx + 1,
&hdr->pgio_mirror_idx))
&new_idx))
goto out_layouterror;
set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
return task->tk_status;
@ -1320,7 +1321,9 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
return 0;
out_layouterror:
ff_layout_read_record_layoutstats_done(task, hdr);
ff_layout_send_layouterror(hdr->lseg);
hdr->pgio_mirror_idx = new_idx;
out_eagain:
rpc_restart_call_prepare(task);
return -EAGAIN;