4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit 6604b203fb6394ed1f24c21bfa3c207e5ae8e461 upstream.
If there is an I/O error, we should not call LAYOUTGET until the
LAYOUTRETURN that reports the error is complete.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/pnfs.c | 6 +++++-
fs/nfs/pnfs.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -897,6 +897,7 @@ static void pnfs_clear_layoutcommit(stru
void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
{
clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
+ clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
smp_mb__after_atomic();
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
@@ -910,8 +911,9 @@ pnfs_prepare_layoutreturn(struct pnfs_la
/* Serialise LAYOUTGET/LAYOUTRETURN */
if (atomic_read(&lo->plh_outstanding) != 0)
return false;
- if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
+ if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
return false;
+ set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
pnfs_get_layout_hdr(lo);
if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
if (stateid != NULL) {
@@ -1903,6 +1905,8 @@ void pnfs_error_mark_layout_for_return(s
spin_lock(&inode->i_lock);
pnfs_set_plh_return_info(lo, range.iomode, 0);
+ /* Block LAYOUTGET */
+ set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
/*
* mark all matching lsegs so that we are sure to have no live
* segments at hand when sending layoutreturn. See pnfs_put_lseg()
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -96,6 +96,7 @@ enum {
NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
NFS_LAYOUT_RETURN, /* layoutreturn in progress */
+ NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
--
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