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NFS/flexfiles: Speed up read failover when DSes are down

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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>
This commit is contained in:
Trond Myklebust 2019-02-14 17:32:40 -05:00
parent 17aaec8167
commit 76c6690522
3 changed files with 73 additions and 12 deletions
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10
fs/nfs/pnfs_dev.c
View file

@ -283,6 +283,16 @@ 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)
{