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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-08-31 02:05:47 -0700
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-08-31 02:05:47 -0700
commit2d89a1d3c9ff8ceb115f001e66cff9788338ca47 (patch)
treec9e05f049190c054640b7c49695deef9c5d3cf5a /fs/nfs
parent21b874c873b5019db8bb4b4f6aa929c4bac0a398 (diff)
downloadlinux-2d89a1d3c9ff8ceb115f001e66cff9788338ca47.tar.bz2
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 <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/pnfs.c9
1 files changed, 9 insertions, 0 deletions
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;