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nfs: have ff_layout_get_ds_cred take a reference to the cred

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In later patches, we're going to want to allow the creds to be updated
when we get a new layout with updated creds. Have this function take
a reference to the cred that is later put once the call has been
dispatched.

Also, prepare for this change by ensuring we follow RCU rules when
getting a reference to the cred as well.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Jeff Layton 2016-04-21 20:51:58 -04:00 committed by Anna Schumaker
parent 547a637630
commit 57f3f4c0cd
2 changed files with 35 additions and 10 deletions
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15
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -1712,7 +1712,7 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
goto out_failed;
ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
if (IS_ERR(ds_cred))
if (!ds_cred)
goto out_failed;
vers = nfs4_ff_layout_ds_version(lseg, idx);
@ -1737,7 +1737,7 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
vers == 3 ? &ff_layout_read_call_ops_v3 :
&ff_layout_read_call_ops_v4,
0, RPC_TASK_SOFTCONN);
put_rpccred(ds_cred);
return PNFS_ATTEMPTED;
out_failed:
@ -1769,7 +1769,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
return PNFS_NOT_ATTEMPTED;
ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
if (IS_ERR(ds_cred))
if (!ds_cred)
return PNFS_NOT_ATTEMPTED;
vers = nfs4_ff_layout_ds_version(lseg, idx);
@ -1798,6 +1798,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
vers == 3 ? &ff_layout_write_call_ops_v3 :
&ff_layout_write_call_ops_v4,
sync, RPC_TASK_SOFTCONN);
put_rpccred(ds_cred);
return PNFS_ATTEMPTED;
}
@ -1824,7 +1825,7 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
struct rpc_clnt *ds_clnt;
struct rpc_cred *ds_cred;
u32 idx;
int vers;
int vers, ret;
struct nfs_fh *fh;
idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
@ -1838,7 +1839,7 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
goto out_err;
ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
if (IS_ERR(ds_cred))
if (!ds_cred)
goto out_err;
vers = nfs4_ff_layout_ds_version(lseg, idx);
@ -1854,10 +1855,12 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
if (fh)
data->args.fh = fh;
return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
vers == 3 ? &ff_layout_commit_call_ops_v3 :
&ff_layout_commit_call_ops_v4,
how, RPC_TASK_SOFTCONN);
put_rpccred(ds_cred);
return ret;
out_err:
pnfs_generic_prepare_to_resend_writes(data);
pnfs_generic_commit_release(data);

30
fs/nfs/flexfilelayout/flexfilelayoutdev.c
View File

@ -338,6 +338,25 @@ static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
return 0;
}
static struct rpc_cred *
ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
{
struct rpc_cred *cred, **pcred;
pcred = &mirror->cred;
rcu_read_lock();
do {
cred = rcu_dereference(*pcred);
if (!cred)
break;
cred = get_rpccred_rcu(cred);
} while(!cred);
rcu_read_unlock();
return cred;
}
struct nfs_fh *
nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
{
@ -435,10 +454,13 @@ ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
struct rpc_cred *cred;
if (mirror && mirror->cred)
cred = mirror->cred;
else
cred = mdscred;
if (mirror) {
cred = ff_layout_get_mirror_cred(mirror, lseg->pls_range.iomode);
if (!cred)
cred = get_rpccred(mdscred);
} else {
cred = get_rpccred(mdscred);
}
return cred;
}