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NFSv4.1/pNFS: Ensure we enforce RFC5661 Section 12.5.5.2.1

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The RFC requires us to check if the server is recalling a stateid that we
haven't yet received. If so, tell it to wait.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-12-28 12:57:53 -05:00
parent fc7ff36747
commit 41c9127d6d
1 changed files with 20 additions and 0 deletions
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20
fs/nfs/callback_proc.c
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@ -160,6 +160,22 @@ static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
return lo;
}
/*
* Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
*/
static bool pnfs_check_stateid_sequence(struct pnfs_layout_hdr *lo,
const nfs4_stateid *new)
{
u32 oldseq, newseq;
oldseq = be32_to_cpu(lo->plh_stateid.seqid);
newseq = be32_to_cpu(new->seqid);
if (newseq > oldseq + 1)
return false;
return true;
}
static u32 initiate_file_draining(struct nfs_client *clp,
struct cb_layoutrecallargs *args)
{
@ -175,6 +191,10 @@ static u32 initiate_file_draining(struct nfs_client *clp,
ino = lo->plh_inode;
spin_lock(&ino->i_lock);
if (!pnfs_check_stateid_sequence(lo, &args->cbl_stateid)) {
rv = NFS4ERR_DELAY;
goto unlock;
}
pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
spin_unlock(&ino->i_lock);