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nfs4.1: fix several problems with _pnfs_return_layout 

_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@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2011-06-13 18:54:53 -04:00 committed by Trond Myklebust
parent cec765cf58
commit a2e1d4f2e5
2 changed files with 9 additions and 7 deletions
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10
fs/nfs/nfs4proc.c
View File

@ -5706,6 +5706,7 @@ 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__);
@ -5717,16 +5718,15 @@ static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
nfs_restart_rpc(task, lrp->clp);
return;
}
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);
if (task->tk_status == 0) {
if (lrp->res.lrs_present) {
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__);
}

8
fs/nfs/pnfs.c
View File

@ -634,12 +634,14 @@ _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);