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nfsd: serialize layout stateid morphing operations

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In order to allow the client to make a sane determination of what
happened with racing LAYOUTGET/LAYOUTRETURN/CB_LAYOUTRECALL calls, we
must ensure that the seqids return accurately represent the order of
operations. The simplest way to do that is to ensure that operations on
a single stateid are serialized.

This patch adds a mutex to the layout stateid, and locks it when
checking the layout stateid's seqid. The mutex is held over the entire
operation and released after the seqid is bumped.

Note that in the case of CB_LAYOUTRECALL we must move the increment of
the seqid and setting into a new cb "prepare" operation. The lease
infrastructure will call the lm_break callback with a spinlock held, so
and we can't take the mutex in that codepath.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2015-09-17 07:58:24 -04:00 committed by J. Bruce Fields
parent 4eaea13425
commit cc8a55320b
3 changed files with 26 additions and 4 deletions
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25
fs/nfsd/nfs4layouts.c
View File

@ -201,6 +201,7 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
INIT_LIST_HEAD(&ls->ls_perfile);
spin_lock_init(&ls->ls_lock);
INIT_LIST_HEAD(&ls->ls_layouts);
mutex_init(&ls->ls_mutex);
ls->ls_layout_type = layout_type;
nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
NFSPROC4_CLNT_CB_LAYOUT);
@ -262,19 +263,23 @@ nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
status = nfserr_jukebox;
if (!ls)
goto out;
mutex_lock(&ls->ls_mutex);
} else {
ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
status = nfserr_bad_stateid;
mutex_lock(&ls->ls_mutex);
if (stateid->si_generation > stid->sc_stateid.si_generation)
goto out_put_stid;
goto out_unlock_stid;
if (layout_type != ls->ls_layout_type)
goto out_put_stid;
goto out_unlock_stid;
}
*lsp = ls;
return 0;
out_unlock_stid:
mutex_unlock(&ls->ls_mutex);
out_put_stid:
nfs4_put_stid(stid);
out:
@ -296,8 +301,6 @@ nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
trace_layout_recall(&ls->ls_stid.sc_stateid);
atomic_inc(&ls->ls_stid.sc_count);
update_stateid(&ls->ls_stid.sc_stateid);
memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
nfsd4_run_cb(&ls->ls_recall);
out_unlock:
@ -494,6 +497,7 @@ nfsd4_return_file_layouts(struct svc_rqst *rqstp,
}
spin_unlock(&ls->ls_lock);
mutex_unlock(&ls->ls_mutex);
nfs4_put_stid(&ls->ls_stid);
nfsd4_free_layouts(&reaplist);
return nfs_ok;
@ -608,6 +612,17 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
}
}
static void
nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
{
struct nfs4_layout_stateid *ls =
container_of(cb, struct nfs4_layout_stateid, ls_recall);
mutex_lock(&ls->ls_mutex);
update_stateid(&ls->ls_stid.sc_stateid);
memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
}
static int
nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
@ -649,12 +664,14 @@ nfsd4_cb_layout_release(struct nfsd4_callback *cb)
trace_layout_recall_release(&ls->ls_stid.sc_stateid);
mutex_unlock(&ls->ls_mutex);
nfsd4_return_all_layouts(ls, &reaplist);
nfsd4_free_layouts(&reaplist);
nfs4_put_stid(&ls->ls_stid);
}
static struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
.prepare = nfsd4_cb_layout_prepare,
.done = nfsd4_cb_layout_done,
.release = nfsd4_cb_layout_release,
};

4
fs/nfsd/nfs4proc.c
View File

@ -1309,6 +1309,7 @@ nfsd4_layoutget(struct svc_rqst *rqstp,
nfserr = nfsd4_insert_layout(lgp, ls);
out_put_stid:
mutex_unlock(&ls->ls_mutex);
nfs4_put_stid(&ls->ls_stid);
out:
return nfserr;
@ -1362,6 +1363,9 @@ nfsd4_layoutcommit(struct svc_rqst *rqstp,
goto out;
}
/* LAYOUTCOMMIT does not require any serialization */
mutex_unlock(&ls->ls_mutex);
if (new_size > i_size_read(inode)) {
lcp->lc_size_chg = 1;
lcp->lc_newsize = new_size;

1
fs/nfsd/state.h
View File

@ -562,6 +562,7 @@ struct nfs4_layout_stateid {
struct nfsd4_callback ls_recall;
stateid_t ls_recall_sid;
bool ls_recalled;
struct mutex ls_mutex;
};
static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)