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 <Trond.Myklebust@xxxxxxxxxx>
---
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 6cce57e..52d8472 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 bdb70cc..8ba7c35 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -306,8 +306,6 @@ 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);
}
@@ -438,10 +436,8 @@ 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)) {
@@ -560,7 +556,6 @@ 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));
@@ -882,8 +877,6 @@ 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 aacda7f..92f6ce6 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)
{
--
1.7.11.4
--
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