summaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorTrond Myklebust <trond.myklebust@primarydata.com>2015-09-01 11:49:44 +0200
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-09-02 00:12:11 +0200
commit81d6dc8b3431d298abaef11d8bc64646fc691618 (patch)
tree54a73e23f8f032049cc49cc5e6ef4f9b4c4eb04a /fs
parentNFSv4.1/flexfiles: Fix incorrect usage of pnfs_generic_mark_devid_invalid() (diff)
downloadlinux-81d6dc8b3431d298abaef11d8bc64646fc691618.tar.xz
linux-81d6dc8b3431d298abaef11d8bc64646fc691618.zip
NFSv4.1/flexfiles: RW layouts are valid only if all mirrors are valid
Unlike read layouts, the writeable layout cannot fall back to using only one of the mirrors. It need to write to all of them. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayoutdev.c30
1 files changed, 28 insertions, 2 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index 883d35c86778..b6c21e9fa002 100644
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -528,11 +528,11 @@ int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
return 0;
}
-bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
{
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_deviceid_node *devid;
- int idx;
+ u32 idx;
for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
mirror = FF_LAYOUT_COMP(lseg, idx);
@@ -546,6 +546,32 @@ bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
return false;
}
+static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *devid;
+ u32 idx;
+
+ for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ if (!mirror || !mirror->mirror_ds)
+ return false;
+ devid = &mirror->mirror_ds->id_node;
+ if (ff_layout_test_devid_unavailable(devid))
+ return false;
+ }
+
+ return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
+}
+
+bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ if (lseg->pls_range.iomode == IOMODE_READ)
+ return ff_read_layout_has_available_ds(lseg);
+ /* Note: RW layout needs all mirrors available */
+ return ff_rw_layout_has_available_ds(lseg);
+}
+
module_param(dataserver_retrans, uint, 0644);
MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
"retries a request before it attempts further "