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NFSv4.1/pnfs: Handle LAYOUTGET return values correctly

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According to RFC5661 section 18.43.3, if the server cannot satisfy
the loga_minlength argument to LAYOUTGET, there are 2 cases:
1) If loga_minlength == 0, it returns NFS4ERR_LAYOUTTRYLATER
2) If loga_minlength != 0, it returns NFS4ERR_BADLAYOUT

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-08-31 01:19:22 -07:00
parent 4ae93560b1
commit 21b874c873
1 changed files with 14 additions and 1 deletions
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15
fs/nfs/nfs4proc.c
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@ -7780,11 +7780,20 @@ static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
switch (task->tk_status) {
case 0:
goto out;
/*
* NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
* length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
*/
case -NFS4ERR_BADLAYOUT:
goto out_overflow;
/*
* NFS4ERR_LAYOUTTRYLATER is a conflict with another client
* (or clients) writing to the same RAID stripe
* (or clients) writing to the same RAID stripe except when
* the minlength argument is 0 (see RFC5661 section 18.43.3).
*/
case -NFS4ERR_LAYOUTTRYLATER:
if (lgp->args.minlength == 0)
goto out_overflow;
/*
* NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
* existing layout before getting a new one).
@ -7840,6 +7849,10 @@ static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
rpc_restart_call_prepare(task);
out:
dprintk("<-- %s\n", __func__);
return;
out_overflow:
task->tk_status = -EOVERFLOW;
goto out;
}
static size_t max_response_pages(struct nfs_server *server)