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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-02-14 17:32:40 -0500
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-03-01 22:37:38 -0500
commit76c6690522bb3e335ce1e201360df8776cab4d2c (patch)
treeade5acb43b8b1a85e6c85f032e0c1632b1bf6eee /fs/nfs
parent17aaec816751d77e443dee66d11d9e6ac00ac95c (diff)
downloadlinux-stericsson-76c6690522bb3e335ce1e201360df8776cab4d2c.tar.gz
NFS/flexfiles: Speed up read failover when DSes are down
If we notice that a DS may be down, we should attempt to read from the other mirrors first before we go back to retry the dead DS. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c74
-rw-r--r--fs/nfs/pnfs.h1
-rw-r--r--fs/nfs/pnfs_dev.c10
3 files changed, 73 insertions, 12 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 747ab2fafb69..44ccfce3784e 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -788,10 +788,28 @@ ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
}
}
+static void
+ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ if (devid)
+ nfs4_mark_deviceid_unavailable(devid);
+}
+
+static void
+ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ if (devid)
+ nfs4_mark_deviceid_available(devid);
+}
+
static struct nfs4_pnfs_ds *
-ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
- int start_idx,
- int *best_idx)
+ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
+ int start_idx, int *best_idx,
+ bool check_device)
{
struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
struct nfs4_ff_layout_mirror *mirror;
@@ -799,25 +817,53 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
bool fail_return = false;
int idx;
- /* mirrors are sorted by efficiency */
+ /* mirrors are initially sorted by efficiency */
for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
if (idx+1 == fls->mirror_array_cnt)
- fail_return = true;
+ fail_return = !check_device;
mirror = FF_LAYOUT_COMP(lseg, idx);
- if (ff_layout_test_devid_unavailable(&mirror->mirror_ds->id_node))
+ ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
+ if (!ds)
continue;
- ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
- if (ds) {
- *best_idx = idx;
- return ds;
- }
+ if (check_device &&
+ nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
+ continue;
+
+ *best_idx = idx;
+ return ds;
}
return NULL;
}
+static struct nfs4_pnfs_ds *
+ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
+ int start_idx, int *best_idx)
+{
+ return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
+ int start_idx, int *best_idx)
+{
+ return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
+ int start_idx, int *best_idx)
+{
+ struct nfs4_pnfs_ds *ds;
+
+ ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
+ if (ds)
+ return ds;
+ return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
+}
+
static void
ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req,
@@ -1167,8 +1213,10 @@ static int ff_layout_async_handle_error(struct rpc_task *task,
{
int vers = clp->cl_nfs_mod->rpc_vers->number;
- if (task->tk_status >= 0)
+ if (task->tk_status >= 0) {
+ ff_layout_mark_ds_reachable(lseg, idx);
return 0;
+ }
/* Handle the case of an invalid layout segment */
if (!pnfs_is_valid_lseg(lseg))
@@ -1231,6 +1279,8 @@ static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
mirror, offset, length, status, opnum,
GFP_NOIO);
+ if (status == NFS4ERR_NXIO)
+ ff_layout_mark_ds_unreachable(lseg, idx);
pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 56659ccce1d8..c0420b979d88 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -350,6 +350,7 @@ void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nf
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
const struct nfs4_deviceid *);
bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
+void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
void nfs4_deviceid_purge_client(const struct nfs_client *);
diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index ec6b607ff1d7..537b80d693f1 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -284,6 +284,16 @@ nfs4_put_deviceid_node(struct nfs4_deviceid_node *d)
EXPORT_SYMBOL_GPL(nfs4_put_deviceid_node);
void
+nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node)
+{
+ if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags)) {
+ clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
+ smp_mb__after_atomic();
+ }
+}
+EXPORT_SYMBOL_GPL(nfs4_mark_deviceid_available);
+
+void
nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node)
{
node->timestamp_unavailable = jiffies;