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authorTrond Myklebust <trondmy@gmail.com>2019-04-07 13:59:08 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-04-25 14:18:14 -0400
commit33344e0f7eaa2efbf9fcc55557d02e8603aa7012 (patch)
treed4d349e0fd2dfca232c8fc02b6d47ca1ac626caf /fs/nfs/flexfilelayout
parent28b1d3f5a772b705ca76df620eb9f686aa2d0b4c (diff)
pNFS: Add tracking to limit the number of pNFS retries
When the client is reading or writing using pNFS, and hits an error on the DS, then it typically sends a LAYOUTERROR and/or LAYOUTRETURN to the MDS, before redirtying the failed pages, and going for a new round of reads/writebacks. The problem is that if the server has no way to fix the DS, then we may need a way to interrupt this loop after a set number of attempts have been made. This patch adds an optional module parameter that allows the admin to specify how many times to retry the read/writeback process before failing with a fatal error. The default behaviour is to retry forever. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/flexfilelayout')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 6673d4ff5a2a..9fdbcfd3e39d 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -28,6 +28,8 @@
#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
#define FF_LAYOUTRETURN_MAXERR 20
+static unsigned short io_maxretrans;
+
static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
struct nfs_pgio_header *hdr);
static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
@@ -925,6 +927,7 @@ retry:
pgm = &pgio->pg_mirrors[0];
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
+ pgio->pg_maxretrans = io_maxretrans;
return;
out_nolseg:
if (pgio->pg_error < 0)
@@ -992,6 +995,7 @@ retry:
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
}
+ pgio->pg_maxretrans = io_maxretrans;
return;
out_mds:
@@ -2515,3 +2519,7 @@ MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
module_init(nfs4flexfilelayout_init);
module_exit(nfs4flexfilelayout_exit);
+
+module_param(io_maxretrans, ushort, 0644);
+MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
+ "retries an I/O request before returning an error. ");