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NFS: Clean up the pNFS layoutget interface

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Ensure that we do return errors from nfs4_proc_layoutget() and that we
don't mark the layout as having failed if the error was due to a
signal or resource problem on the client side.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-09-17 17:12:15 -04:00
parent d19751e7b9
commit a0b0a6e39b
4 changed files with 27 additions and 17 deletions
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14
fs/nfs/nfs4proc.c
View File

@ -6286,7 +6286,8 @@ static const struct rpc_call_ops nfs4_layoutget_call_ops = {
.rpc_release = nfs4_layoutget_release,
};
void nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
{
struct nfs_server *server = NFS_SERVER(lgp->args.inode);
size_t max_pages = max_response_pages(server);
@ -6303,6 +6304,7 @@ void nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
.callback_data = lgp,
.flags = RPC_TASK_ASYNC,
};
struct pnfs_layout_segment *lseg = NULL;
int status = 0;
dprintk("--> %s\n", __func__);
@ -6310,7 +6312,7 @@ void nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
if (!lgp->args.layout.pages) {
nfs4_layoutget_release(lgp);
return;
return ERR_PTR(-ENOMEM);
}
lgp->args.layout.pglen = max_pages * PAGE_SIZE;
@ -6319,15 +6321,17 @@ void nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return;
return ERR_CAST(task);
status = nfs4_wait_for_completion_rpc_task(task);
if (status == 0)
status = task->tk_status;
if (status == 0)
status = pnfs_layout_process(lgp);
lseg = pnfs_layout_process(lgp);
rpc_put_task(task);
dprintk("<-- %s status=%d\n", __func__, status);
return;
if (status)
return ERR_PTR(status);
return lseg;
}
static void

25
fs/nfs/pnfs.c
View File

@ -582,7 +582,7 @@ send_layoutget(struct pnfs_layout_hdr *lo,
struct inode *ino = lo->plh_inode;
struct nfs_server *server = NFS_SERVER(ino);
struct nfs4_layoutget *lgp;
struct pnfs_layout_segment *lseg = NULL;
struct pnfs_layout_segment *lseg;
dprintk("--> %s\n", __func__);
@ -599,16 +599,22 @@ send_layoutget(struct pnfs_layout_hdr *lo,
lgp->args.type = server->pnfs_curr_ld->id;
lgp->args.inode = ino;
lgp->args.ctx = get_nfs_open_context(ctx);
lgp->lsegpp = &lseg;
lgp->gfp_flags = gfp_flags;
/* Synchronously retrieve layout information from server and
* store in lseg.
*/
nfs4_proc_layoutget(lgp, gfp_flags);
if (!lseg) {
/* remember that LAYOUTGET failed and suspend trying */
set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
lseg = nfs4_proc_layoutget(lgp, gfp_flags);
if (IS_ERR(lseg)) {
switch (PTR_ERR(lseg)) {
case -ENOMEM:
case -ERESTARTSYS:
break;
default:
/* remember that LAYOUTGET failed and suspend trying */
set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
}
return NULL;
}
return lseg;
@ -1096,7 +1102,7 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(pnfs_update_layout);
int
struct pnfs_layout_segment *
pnfs_layout_process(struct nfs4_layoutget *lgp)
{
struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
@ -1129,7 +1135,7 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
}
init_lseg(lo, lseg);
lseg->pls_range = res->range;
*lgp->lsegpp = get_lseg(lseg);
get_lseg(lseg);
pnfs_insert_layout(lo, lseg);
if (res->return_on_close) {
@ -1140,8 +1146,9 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
/* Done processing layoutget. Set the layout stateid */
pnfs_set_layout_stateid(lo, &res->stateid, false);
spin_unlock(&ino->i_lock);
return lseg;
out:
return status;
return ERR_PTR(status);
out_forget_reply:
spin_unlock(&ino->i_lock);

4
fs/nfs/pnfs.h
View File

@ -172,7 +172,7 @@ extern int nfs4_proc_getdevicelist(struct nfs_server *server,
struct pnfs_devicelist *devlist);
extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
struct pnfs_device *dev);
extern void nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
/* pnfs.c */
@ -192,7 +192,7 @@ void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page
int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
int pnfs_layout_process(struct nfs4_layoutget *lgp);
struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
void pnfs_free_lseg_list(struct list_head *tmp_list);
void pnfs_destroy_layout(struct nfs_inode *);
void pnfs_destroy_all_layouts(struct nfs_client *);

1
include/linux/nfs_xdr.h
View File

@ -251,7 +251,6 @@ struct nfs4_layoutget_res {
struct nfs4_layoutget {
struct nfs4_layoutget_args args;
struct nfs4_layoutget_res res;
struct pnfs_layout_segment **lsegpp;
gfp_t gfp_flags;
};