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[1/2] NFS: Don't move layouts to plh_return_segs list while in use

Message ID 20200805202431.627013-2-trondmy@kernel.org
State New
Headers show
Series Don't do pNFS I/O when not holding a layout | expand

Commit Message

trondmy@kernel.org Aug. 5, 2020, 8:24 p.m. UTC
From: Trond Myklebust <trond.myklebust@hammerspace.com>

If the layout segment is still in use for a read or a write, we should
not move it to the layout plh_return_segs list. If we do, we can end
up returning the layout while I/O is still in progress.

Fixes: e0b7d420f72a ("pNFS: Don't discard layout segments that are marked for return")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
 fs/nfs/pnfs.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)
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diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d8cdb94c6668..262ce01c7abe 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2392,16 +2392,6 @@  pnfs_layout_process(struct nfs4_layoutget *lgp)
 	return ERR_PTR(-EAGAIN);
-static int
-mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
-		struct list_head *tmp_list)
-	if (!mark_lseg_invalid(lseg, tmp_list))
-		return 0;
-	pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
-	return 1;
  * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
  * @lo: pointer to layout header
@@ -2438,7 +2428,7 @@  pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 				lseg, lseg->pls_range.iomode,
-			if (mark_lseg_invalid_or_return(lseg, tmp_list))
+			if (mark_lseg_invalid(lseg, tmp_list))
 			set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);