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NFSv4/pnfs: Allow layoutget to return EAGAIN for softerr mounts

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If we're using the 'softerr' mount option, we may want to allow
layoutget to return EAGAIN to allow knfsd server threads to return a
JUKEBOX/DELAY error to the client instead of busy waiting.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2023-09-09 19:16:53 -04:00
parent 5b9d31ae1c
commit 6e7434abcd
4 changed files with 22 additions and 11 deletions
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18
fs/nfs/nfs4proc.c
View File

@ -9646,6 +9646,9 @@ nfs4_layoutget_handle_exception(struct rpc_task *task,
nfs4_sequence_free_slot(&lgp->res.seq_res);
exception->state = NULL;
exception->stateid = NULL;
switch (nfs4err) {
case 0:
goto out;
@ -9741,7 +9744,8 @@ static const struct rpc_call_ops nfs4_layoutget_call_ops = {
};
struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
struct nfs4_exception *exception)
{
struct inode *inode = lgp->args.inode;
struct nfs_server *server = NFS_SERVER(inode);
@ -9761,13 +9765,10 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
RPC_TASK_MOVEABLE,
};
struct pnfs_layout_segment *lseg = NULL;
struct nfs4_exception exception = {
.inode = inode,
.timeout = *timeout,
};
int status = 0;
nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
exception->retry = 0;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
@ -9778,11 +9779,12 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
goto out;
if (task->tk_status < 0) {
status = nfs4_layoutget_handle_exception(task, lgp, &exception);
*timeout = exception.timeout;
exception->retry = 1;
status = nfs4_layoutget_handle_exception(task, lgp, exception);
} else if (lgp->res.layoutp->len == 0) {
exception->retry = 1;
status = -EAGAIN;
*timeout = nfs4_update_delay(&exception.timeout);
nfs4_update_delay(&exception->timeout);
} else
lseg = pnfs_layout_process(lgp);
out:

8
fs/nfs/pnfs.c
View File

@ -1980,7 +1980,9 @@ pnfs_update_layout(struct inode *ino,
struct pnfs_layout_segment *lseg = NULL;
struct nfs4_layoutget *lgp;
nfs4_stateid stateid;
long timeout = 0;
struct nfs4_exception exception = {
.inode = ino,
};
unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
bool first;
@ -2144,7 +2146,7 @@ lookup_again:
lgp->lo = lo;
pnfs_get_layout_hdr(lo);
lseg = nfs4_proc_layoutget(lgp, &timeout);
lseg = nfs4_proc_layoutget(lgp, &exception);
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
nfs_layoutget_end(lo);
@ -2171,6 +2173,8 @@ lookup_again:
goto out_put_layout_hdr;
}
if (lseg) {
if (!exception.retry)
goto out_put_layout_hdr;
if (first)
pnfs_clear_first_layoutget(lo);
trace_pnfs_update_layout(ino, pos, count,

5
fs/nfs/pnfs.h
View File

@ -35,6 +35,7 @@
#include <linux/nfs_page.h>
#include <linux/workqueue.h>
struct nfs4_exception;
struct nfs4_opendata;
enum {
@ -245,7 +246,9 @@ extern size_t max_response_pages(struct nfs_server *server);
extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
struct pnfs_device *dev,
const struct cred *cred);
extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
extern struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
struct nfs4_exception *exception);
extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
/* pnfs.c */

2
fs/nfs/write.c
View File

@ -739,6 +739,8 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
&pgio);
pgio.pg_error = 0;
nfs_pageio_complete(&pgio);
if (err == -EAGAIN && mntflags & NFS_MOUNT_SOFTERR)
break;
} while (err < 0 && !nfs_error_is_fatal(err));
nfs_io_completion_put(ioc);