On 2011-06-13 18:54, Fred Isaman wrote:
> _pnfs_return_layout had the following problems:
>
> - it did not call pnfs_free_lseg_list on all paths
> - it unintentionally did a forgetful return when there was no outstanding io
> - it raced with concurrent LAYOUTGETS
>
> Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxx>
ACK
Benny
> ---
> fs/nfs/nfs4proc.c | 8 ++++----
> fs/nfs/pnfs.c | 8 +++++---
> 2 files changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index bc78597..2b2f51b 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -5757,6 +5757,7 @@ static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
> {
> struct nfs4_layoutreturn *lrp = calldata;
> struct nfs_server *server;
> + struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
>
> dprintk("--> %s\n", __func__);
>
> @@ -5768,16 +5769,15 @@ static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
> nfs_restart_rpc(task, lrp->clp);
> return;
> }
> + spin_lock(&lo->plh_inode->i_lock);
> if (task->tk_status == 0) {
> - struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
> -
> if (lrp->res.lrs_present) {
> - spin_lock(&lo->plh_inode->i_lock);
> pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
> - spin_unlock(&lo->plh_inode->i_lock);
> } else
> BUG_ON(!list_empty(&lo->plh_segs));
> }
> + lo->plh_block_lgets--;
> + spin_unlock(&lo->plh_inode->i_lock);
> dprintk("<-- %s\n", __func__);
> }
>
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index 8ff8c1b..1abb300 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -640,12 +640,14 @@ _pnfs_return_layout(struct inode *ino)
>
> spin_lock(&ino->i_lock);
> lo = nfsi->layout;
> - if (!lo || !mark_matching_lsegs_invalid(lo, &tmp_list, NULL)) {
> + if (!lo) {
> spin_unlock(&ino->i_lock);
> - dprintk("%s: no layout segments to return\n", __func__);
> - goto out;
> + dprintk("%s: no layout to return\n", __func__);
> + return status;
> }
> stateid = nfsi->layout->plh_stateid;
> + mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
> + lo->plh_block_lgets++;
> /* Reference matched in nfs4_layoutreturn_release */
> get_layout_hdr(lo);
> spin_unlock(&ino->i_lock);
--
Benny Halevy
CTO, Tonian Inc.
Tel: +972-54-802-8340
benny@xxxxxxxxxx
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