From 8006bfba36d42b6976ed92979f51e5f9bef2625c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 21 Sep 2012 14:48:04 -0400 Subject: [PATCH] NFSv4.1: Get rid of the NFS_LAYOUT_DESTROYED state We already have a mechanism for blocking LAYOUTGET by means of the plh_block_lgets counter. The only "service" that NFS_LAYOUT_DESTROYED provides at this point is to block layoutget once the layout segment list is empty, which basically means that you have to wait until the pnfs_layout_hdr is destroyed before you can do pNFS on that file again. This patch enables the reuse of the pnfs_layout_hdr if the layout segment list is empty. Signed-off-by: Trond Myklebust --- fs/nfs/nfs4filelayout.c | 3 +-- fs/nfs/pnfs.c | 9 +-------- fs/nfs/pnfs.h | 7 ------- 3 files changed, 2 insertions(+), 17 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 6cce57e7fe5..52d84721206 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -279,8 +279,7 @@ filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) { struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); - return pnfs_test_layout_destroyed(lseg->pls_layout) || - filelayout_test_devid_unavailable(node); + return filelayout_test_devid_unavailable(node); } /* diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index fcc72ecf2fd..bda88a27507 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -331,8 +331,6 @@ pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, list_del_init(&lseg->pls_list); /* 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_DESTROYED, &lo->plh_flags); rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); } @@ -463,10 +461,8 @@ pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, dprintk("%s:Begin lo %p\n", __func__, lo); - if (list_empty(&lo->plh_segs)) { - set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags); + if (list_empty(&lo->plh_segs)) return 0; - } list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) if (!recall_range || should_free_lseg(&lseg->pls_range, recall_range)) { @@ -590,7 +586,6 @@ pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, (int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0) return true; return lo->plh_block_lgets || - test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || (list_empty(&lo->plh_segs) && (atomic_read(&lo->plh_outstanding) > lget)); @@ -912,8 +907,6 @@ pnfs_find_alloc_layout(struct inode *ino, dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); if (nfsi->layout) { - if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags)) - return NULL; pnfs_get_layout_hdr(nfsi->layout); return nfsi->layout; } diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index aacda7fbb53..92f6ce6532b 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -62,7 +62,6 @@ enum { NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ NFS_LAYOUT_ROC, /* some lseg had roc bit set */ - NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ NFS_LAYOUT_RETURNED, /* layout has already been returned */ }; @@ -278,12 +277,6 @@ pnfs_test_layout_returned(struct pnfs_layout_hdr *lo) return test_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags); } -static inline bool -pnfs_test_layout_destroyed(struct pnfs_layout_hdr *lo) -{ - return test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags); -} - static inline struct pnfs_layout_segment * pnfs_get_lseg(struct pnfs_layout_segment *lseg) { -- 2.20.1