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| author | Andy Adamson <andros@netapp.com> | 2011-03-01 01:34:22 +0000 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-03-11 15:38:43 -0500 |
| commit | 568e8c494ded95a28c5dd8b79b4d3ffb95b6d845 (patch) | |
| tree | 00e71f79575635c0ddfcd1210e263088cc121da2 /fs/nfs/pnfs.c | |
| parent | ea8eecdd11ee6becd09c095c8efa88aa7df95961 (diff) | |
| download | lwn-568e8c494ded95a28c5dd8b79b4d3ffb95b6d845.tar.gz lwn-568e8c494ded95a28c5dd8b79b4d3ffb95b6d845.zip | |
NFSv4.1: turn off pNFS on ds connection failure
If a data server is unavailable, go through MDS.
Mark the deviceid containing the data server as a negative cache entry.
Do not try to connect to any data server on a deviceid marked as a negative
cache entry. Mark any layout that tries to use the marked deviceid as failed.
Inodes with a layout marked as fails will not use the layout for I/O, and will
not perform any more layoutgets.
Inodes without a layout will still do layoutget, but the layout will get
marked immediately.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 1f4c153441a1..3e545144a0b2 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -739,15 +739,16 @@ pnfs_update_layout(struct inode *ino, dprintk("%s matches recall, use MDS\n", __func__); goto out_unlock; } - /* Check to see if the layout for the given range already exists */ - lseg = pnfs_find_lseg(lo, iomode); - if (lseg) - goto out_unlock; /* if LAYOUTGET already failed once we don't try again */ if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags)) goto out_unlock; + /* Check to see if the layout for the given range already exists */ + lseg = pnfs_find_lseg(lo, iomode); + if (lseg) + goto out_unlock; + if (pnfs_layoutgets_blocked(lo, NULL, 0)) goto out_unlock; atomic_inc(&lo->plh_outstanding); |