From 2d89a1d3c9ff8ceb115f001e66cff9788338ca47 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 31 Aug 2015 02:05:47 -0700 Subject: [PATCH] NFSv4.1/pNFS: Don't request a minimal read layout beyond the end of file If we have a read layout, then sanity check the minimal layout length so that it does not extend beyond the end of file. Signed-off-by: Trond Myklebust --- fs/nfs/pnfs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index c4f918eca3d2..ba1246433794 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -868,6 +868,7 @@ send_layoutget(struct pnfs_layout_hdr *lo, struct nfs_server *server = NFS_SERVER(ino); struct nfs4_layoutget *lgp; struct pnfs_layout_segment *lseg; + loff_t i_size; dprintk("--> %s\n", __func__); @@ -875,9 +876,17 @@ send_layoutget(struct pnfs_layout_hdr *lo, if (lgp == NULL) return NULL; + i_size = i_size_read(ino); + lgp->args.minlength = PAGE_CACHE_SIZE; if (lgp->args.minlength > range->length) lgp->args.minlength = range->length; + if (range->iomode == IOMODE_READ) { + if (range->offset >= i_size) + lgp->args.minlength = 0; + else if (i_size - range->offset < lgp->args.minlength) + lgp->args.minlength = i_size - range->offset; + } lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; lgp->args.range = *range; lgp->args.type = server->pnfs_curr_ld->id; -- 2.20.1