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nfs4filelayout.c
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/*
* Module for the pnfs nfs4 file layout driver.
* Defines all I/O and Policy interface operations, plus code
* to register itself with the pNFS client.
*
* Copyright (c) 2002
* The Regents of the University of Michigan
* All Rights Reserved
*
* Dean Hildebrand <[email protected]>
*
* Permission is granted to use, copy, create derivative works, and
* redistribute this software and such derivative works for any purpose,
* so long as the name of the University of Michigan is not used in
* any advertising or publicity pertaining to the use or distribution
* of this software without specific, written prior authorization. If
* the above copyright notice or any other identification of the
* University of Michigan is included in any copy of any portion of
* this software, then the disclaimer below must also be included.
*
* This software is provided as is, without representation or warranty
* of any kind either express or implied, including without limitation
* the implied warranties of merchantability, fitness for a particular
* purpose, or noninfringement. The Regents of the University of
* Michigan shall not be liable for any damages, including special,
* indirect, incidental, or consequential damages, with respect to any
* claim arising out of or in connection with the use of the software,
* even if it has been or is hereafter advised of the possibility of
* such damages.
*/
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/module.h>
#include <linux/sunrpc/metrics.h>
#include "internal.h"
#include "delegation.h"
#include "nfs4filelayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dean Hildebrand <[email protected]>");
MODULE_DESCRIPTION("The NFSv4 file layout driver");
#define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
static loff_t
filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
loff_t offset)
{
u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
u64 stripe_no;
u32 rem;
offset -= flseg->pattern_offset;
stripe_no = div_u64(offset, stripe_width);
div_u64_rem(offset, flseg->stripe_unit, &rem);
return stripe_no * flseg->stripe_unit + rem;
}
/* This function is used by the layout driver to calculate the
* offset of the file on the dserver based on whether the
* layout type is STRIPE_DENSE or STRIPE_SPARSE
*/
static loff_t
filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
{
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
switch (flseg->stripe_type) {
case STRIPE_SPARSE:
return offset;
case STRIPE_DENSE:
return filelayout_get_dense_offset(flseg, offset);
}
BUG();
}
static int filelayout_async_handle_error(struct rpc_task *task,
struct nfs4_state *state,
struct nfs_client *clp,
int *reset)
{
struct nfs_server *mds_server = NFS_SERVER(state->inode);
struct nfs_client *mds_client = mds_server->nfs_client;
if (task->tk_status >= 0)
return 0;
*reset = 0;
switch (task->tk_status) {
/* MDS state errors */
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
nfs_remove_bad_delegation(state->inode);
case -NFS4ERR_OPENMODE:
nfs4_schedule_stateid_recovery(mds_server, state);
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
nfs4_schedule_stateid_recovery(mds_server, state);
nfs4_schedule_lease_recovery(mds_client);
goto wait_on_recovery;
/* DS session errors */
case -NFS4ERR_BADSESSION:
case -NFS4ERR_BADSLOT:
case -NFS4ERR_BAD_HIGH_SLOT:
case -NFS4ERR_DEADSESSION:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case -NFS4ERR_SEQ_FALSE_RETRY:
case -NFS4ERR_SEQ_MISORDERED:
dprintk("%s ERROR %d, Reset session. Exchangeid "
"flags 0x%x\n", __func__, task->tk_status,
clp->cl_exchange_flags);
nfs4_schedule_session_recovery(clp->cl_session);
break;
case -NFS4ERR_DELAY:
case -NFS4ERR_GRACE:
case -EKEYEXPIRED:
rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
break;
case -NFS4ERR_RETRY_UNCACHED_REP:
break;
default:
dprintk("%s DS error. Retry through MDS %d\n", __func__,
task->tk_status);
*reset = 1;
break;
}
out:
task->tk_status = 0;
return -EAGAIN;
wait_on_recovery:
rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
goto out;
}
/* NFS_PROTO call done callback routines */
static int filelayout_read_done_cb(struct rpc_task *task,
struct nfs_read_data *data)
{
int reset = 0;
dprintk("%s DS read\n", __func__);
if (filelayout_async_handle_error(task, data->args.context->state,
data->ds_clp, &reset) == -EAGAIN) {
dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
__func__, data->ds_clp, data->ds_clp->cl_session);
if (reset) {
pnfs_set_lo_fail(data->lseg);
nfs4_reset_read(task, data);
}
rpc_restart_call_prepare(task);
return -EAGAIN;
}
return 0;
}
/*
* We reference the rpc_cred of the first WRITE that triggers the need for
* a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
* rfc5661 is not clear about which credential should be used.
*/
static void
filelayout_set_layoutcommit(struct nfs_write_data *wdata)
{
if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
wdata->res.verf->committed == NFS_FILE_SYNC)
return;
pnfs_set_layoutcommit(wdata);
dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino,
(unsigned long) NFS_I(wdata->inode)->layout->plh_lwb);
}
/*
* Call ops for the async read/write cases
* In the case of dense layouts, the offset needs to be reset to its
* original value.
*/
static void filelayout_read_prepare(struct rpc_task *task, void *data)
{
struct nfs_read_data *rdata = (struct nfs_read_data *)data;
rdata->read_done_cb = filelayout_read_done_cb;
if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
&rdata->args.seq_args, &rdata->res.seq_res,
task))
return;
rpc_call_start(task);
}
static void filelayout_read_call_done(struct rpc_task *task, void *data)
{
struct nfs_read_data *rdata = (struct nfs_read_data *)data;
dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
/* Note this may cause RPC to be resent */
rdata->mds_ops->rpc_call_done(task, data);
}
static void filelayout_read_count_stats(struct rpc_task *task, void *data)
{
struct nfs_read_data *rdata = (struct nfs_read_data *)data;
rpc_count_iostats(task, NFS_SERVER(rdata->inode)->client->cl_metrics);
}
static void filelayout_read_release(void *data)
{
struct nfs_read_data *rdata = (struct nfs_read_data *)data;
put_lseg(rdata->lseg);
rdata->mds_ops->rpc_release(data);
}
static int filelayout_write_done_cb(struct rpc_task *task,
struct nfs_write_data *data)
{
int reset = 0;
if (filelayout_async_handle_error(task, data->args.context->state,
data->ds_clp, &reset) == -EAGAIN) {
dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
__func__, data->ds_clp, data->ds_clp->cl_session);
if (reset) {
pnfs_set_lo_fail(data->lseg);
nfs4_reset_write(task, data);
}
rpc_restart_call_prepare(task);
return -EAGAIN;
}
filelayout_set_layoutcommit(data);
return 0;
}
/* Fake up some data that will cause nfs_commit_release to retry the writes. */
static void prepare_to_resend_writes(struct nfs_write_data *data)
{
struct nfs_page *first = nfs_list_entry(data->pages.next);
data->task.tk_status = 0;
memcpy(data->verf.verifier, first->wb_verf.verifier,
sizeof(first->wb_verf.verifier));
data->verf.verifier[0]++; /* ensure verifier mismatch */
}
static int filelayout_commit_done_cb(struct rpc_task *task,
struct nfs_write_data *data)
{
int reset = 0;
if (filelayout_async_handle_error(task, data->args.context->state,
data->ds_clp, &reset) == -EAGAIN) {
dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
__func__, data->ds_clp, data->ds_clp->cl_session);
if (reset) {
prepare_to_resend_writes(data);
pnfs_set_lo_fail(data->lseg);
} else
rpc_restart_call_prepare(task);
return -EAGAIN;
}
return 0;
}
static void filelayout_write_prepare(struct rpc_task *task, void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
&wdata->args.seq_args, &wdata->res.seq_res,
task))
return;
rpc_call_start(task);
}
static void filelayout_write_call_done(struct rpc_task *task, void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
/* Note this may cause RPC to be resent */
wdata->mds_ops->rpc_call_done(task, data);
}
static void filelayout_write_count_stats(struct rpc_task *task, void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
rpc_count_iostats(task, NFS_SERVER(wdata->inode)->client->cl_metrics);
}
static void filelayout_write_release(void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
put_lseg(wdata->lseg);
wdata->mds_ops->rpc_release(data);
}
static void filelayout_commit_release(void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
nfs_commit_release_pages(wdata);
if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
nfs_commit_clear_lock(NFS_I(wdata->inode));
put_lseg(wdata->lseg);
nfs_commitdata_release(wdata);
}
static const struct rpc_call_ops filelayout_read_call_ops = {
.rpc_call_prepare = filelayout_read_prepare,
.rpc_call_done = filelayout_read_call_done,
.rpc_count_stats = filelayout_read_count_stats,
.rpc_release = filelayout_read_release,
};
static const struct rpc_call_ops filelayout_write_call_ops = {
.rpc_call_prepare = filelayout_write_prepare,
.rpc_call_done = filelayout_write_call_done,
.rpc_count_stats = filelayout_write_count_stats,
.rpc_release = filelayout_write_release,
};
static const struct rpc_call_ops filelayout_commit_call_ops = {
.rpc_call_prepare = filelayout_write_prepare,
.rpc_call_done = filelayout_write_call_done,
.rpc_count_stats = filelayout_write_count_stats,
.rpc_release = filelayout_commit_release,
};
static enum pnfs_try_status
filelayout_read_pagelist(struct nfs_read_data *data)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
loff_t offset = data->args.offset;
u32 j, idx;
struct nfs_fh *fh;
int status;
dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
__func__, data->inode->i_ino,
data->args.pgbase, (size_t)data->args.count, offset);
if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
return PNFS_NOT_ATTEMPTED;
/* Retrieve the correct rpc_client for the byte range */
j = nfs4_fl_calc_j_index(lseg, offset);
idx = nfs4_fl_calc_ds_index(lseg, j);
ds = nfs4_fl_prepare_ds(lseg, idx);
if (!ds) {
/* Either layout fh index faulty, or ds connect failed */
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
return PNFS_NOT_ATTEMPTED;
}
dprintk("%s USE DS: %s\n", __func__, ds->ds_remotestr);
/* No multipath support. Use first DS */
data->ds_clp = ds->ds_clp;
fh = nfs4_fl_select_ds_fh(lseg, j);
if (fh)
data->args.fh = fh;
data->args.offset = filelayout_get_dserver_offset(lseg, offset);
data->mds_offset = offset;
/* Perform an asynchronous read to ds */
status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
&filelayout_read_call_ops);
BUG_ON(status != 0);
return PNFS_ATTEMPTED;
}
/* Perform async writes. */
static enum pnfs_try_status
filelayout_write_pagelist(struct nfs_write_data *data, int sync)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
loff_t offset = data->args.offset;
u32 j, idx;
struct nfs_fh *fh;
int status;
if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
return PNFS_NOT_ATTEMPTED;
/* Retrieve the correct rpc_client for the byte range */
j = nfs4_fl_calc_j_index(lseg, offset);
idx = nfs4_fl_calc_ds_index(lseg, j);
ds = nfs4_fl_prepare_ds(lseg, idx);
if (!ds) {
printk(KERN_ERR "NFS: %s: prepare_ds failed, use MDS\n",
__func__);
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
return PNFS_NOT_ATTEMPTED;
}
dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__,
data->inode->i_ino, sync, (size_t) data->args.count, offset,
ds->ds_remotestr);
data->write_done_cb = filelayout_write_done_cb;
data->ds_clp = ds->ds_clp;
fh = nfs4_fl_select_ds_fh(lseg, j);
if (fh)
data->args.fh = fh;
/*
* Get the file offset on the dserver. Set the write offset to
* this offset and save the original offset.
*/
data->args.offset = filelayout_get_dserver_offset(lseg, offset);
/* Perform an asynchronous write */
status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
&filelayout_write_call_ops, sync);
BUG_ON(status != 0);
return PNFS_ATTEMPTED;
}
/*
* filelayout_check_layout()
*
* Make sure layout segment parameters are sane WRT the device.
* At this point no generic layer initialization of the lseg has occurred,
* and nothing has been added to the layout_hdr cache.
*
*/
static int
filelayout_check_layout(struct pnfs_layout_hdr *lo,
struct nfs4_filelayout_segment *fl,
struct nfs4_layoutget_res *lgr,
struct nfs4_deviceid *id,
gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d;
struct nfs4_file_layout_dsaddr *dsaddr;
int status = -EINVAL;
struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
dprintk("--> %s\n", __func__);
/* FIXME: remove this check when layout segment support is added */
if (lgr->range.offset != 0 ||
lgr->range.length != NFS4_MAX_UINT64) {
dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
__func__);
goto out;
}
if (fl->pattern_offset > lgr->range.offset) {
dprintk("%s pattern_offset %lld too large\n",
__func__, fl->pattern_offset);
goto out;
}
if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
dprintk("%s Invalid stripe unit (%u)\n",
__func__, fl->stripe_unit);
goto out;
}
/* find and reference the deviceid */
d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
NFS_SERVER(lo->plh_inode)->nfs_client, id);
if (d == NULL) {
dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
if (dsaddr == NULL)
goto out;
} else
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
/* Found deviceid is being reaped */
if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
goto out_put;
fl->dsaddr = dsaddr;
if (fl->first_stripe_index >= dsaddr->stripe_count) {
dprintk("%s Bad first_stripe_index %u\n",
__func__, fl->first_stripe_index);
goto out_put;
}
if ((fl->stripe_type == STRIPE_SPARSE &&
fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
(fl->stripe_type == STRIPE_DENSE &&
fl->num_fh != dsaddr->stripe_count)) {
dprintk("%s num_fh %u not valid for given packing\n",
__func__, fl->num_fh);
goto out_put;
}
if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
dprintk("%s Stripe unit (%u) not aligned with rsize %u "
"wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
nfss->wsize);
}
status = 0;
out:
dprintk("--> %s returns %d\n", __func__, status);
return status;
out_put:
nfs4_fl_put_deviceid(dsaddr);
goto out;
}
static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
{
int i;
for (i = 0; i < fl->num_fh; i++) {
if (!fl->fh_array[i])
break;
kfree(fl->fh_array[i]);
}
kfree(fl->fh_array);
fl->fh_array = NULL;
}
static void
_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
{
filelayout_free_fh_array(fl);
kfree(fl);
}
static int
filelayout_decode_layout(struct pnfs_layout_hdr *flo,
struct nfs4_filelayout_segment *fl,
struct nfs4_layoutget_res *lgr,
struct nfs4_deviceid *id,
gfp_t gfp_flags)
{
struct xdr_stream stream;
struct xdr_buf buf;
struct page *scratch;
__be32 *p;
uint32_t nfl_util;
int i;
dprintk("%s: set_layout_map Begin\n", __func__);
scratch = alloc_page(gfp_flags);
if (!scratch)
return -ENOMEM;
xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
/* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
* num_fh (4) */
p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
if (unlikely(!p))
goto out_err;
memcpy(id, p, sizeof(*id));
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
nfs4_print_deviceid(id);
nfl_util = be32_to_cpup(p++);
if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
fl->commit_through_mds = 1;
if (nfl_util & NFL4_UFLG_DENSE)
fl->stripe_type = STRIPE_DENSE;
else
fl->stripe_type = STRIPE_SPARSE;
fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
fl->first_stripe_index = be32_to_cpup(p++);
p = xdr_decode_hyper(p, &fl->pattern_offset);
fl->num_fh = be32_to_cpup(p++);
dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
fl->pattern_offset);
/* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
* Futher checking is done in filelayout_check_layout */
if (fl->num_fh >
max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
goto out_err;
if (fl->num_fh > 0) {
fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
gfp_flags);
if (!fl->fh_array)
goto out_err;
}
for (i = 0; i < fl->num_fh; i++) {
/* Do we want to use a mempool here? */
fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
if (!fl->fh_array[i])
goto out_err_free;
p = xdr_inline_decode(&stream, 4);
if (unlikely(!p))
goto out_err_free;
fl->fh_array[i]->size = be32_to_cpup(p++);
if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
printk(KERN_ERR "NFS: Too big fh %d received %d\n",
i, fl->fh_array[i]->size);
goto out_err_free;
}
p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
if (unlikely(!p))
goto out_err_free;
memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
dprintk("DEBUG: %s: fh len %d\n", __func__,
fl->fh_array[i]->size);
}
__free_page(scratch);
return 0;
out_err_free:
filelayout_free_fh_array(fl);
out_err:
__free_page(scratch);
return -EIO;
}
static void
filelayout_free_lseg(struct pnfs_layout_segment *lseg)
{
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
dprintk("--> %s\n", __func__);
nfs4_fl_put_deviceid(fl->dsaddr);
kfree(fl->commit_buckets);
_filelayout_free_lseg(fl);
}
static struct pnfs_layout_segment *
filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
struct nfs4_filelayout_segment *fl;
int rc;
struct nfs4_deviceid id;
dprintk("--> %s\n", __func__);
fl = kzalloc(sizeof(*fl), gfp_flags);
if (!fl)
return NULL;
rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
_filelayout_free_lseg(fl);
return NULL;
}
/* This assumes there is only one IOMODE_RW lseg. What
* we really want to do is have a layout_hdr level
* dictionary of <multipath_list4, fh> keys, each
* associated with a struct list_head, populated by calls
* to filelayout_write_pagelist().
* */
if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
int i;
int size = (fl->stripe_type == STRIPE_SPARSE) ?
fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
fl->commit_buckets = kcalloc(size, sizeof(struct nfs4_fl_commit_bucket), gfp_flags);
if (!fl->commit_buckets) {
filelayout_free_lseg(&fl->generic_hdr);
return NULL;
}
fl->number_of_buckets = size;
for (i = 0; i < size; i++) {
INIT_LIST_HEAD(&fl->commit_buckets[i].written);
INIT_LIST_HEAD(&fl->commit_buckets[i].committing);
}
}
return &fl->generic_hdr;
}
/*
* filelayout_pg_test(). Called by nfs_can_coalesce_requests()
*
* return true : coalesce page
* return false : don't coalesce page
*/
static bool
filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
u64 p_stripe, r_stripe;
u32 stripe_unit;
if (!pnfs_generic_pg_test(pgio, prev, req) ||
!nfs_generic_pg_test(pgio, prev, req))
return false;
p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
do_div(p_stripe, stripe_unit);
do_div(r_stripe, stripe_unit);
return (p_stripe == r_stripe);
}
static void
filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
BUG_ON(pgio->pg_lseg != NULL);
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
NFS4_MAX_UINT64,
IOMODE_READ,
GFP_KERNEL);
/* If no lseg, fall back to read through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_read_mds(pgio);
}
static void
filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
BUG_ON(pgio->pg_lseg != NULL);
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
0,
NFS4_MAX_UINT64,
IOMODE_RW,
GFP_NOFS);
/* If no lseg, fall back to write through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_write_mds(pgio);
}
static const struct nfs_pageio_ops filelayout_pg_read_ops = {
.pg_init = filelayout_pg_init_read,
.pg_test = filelayout_pg_test,
.pg_doio = pnfs_generic_pg_readpages,
};
static const struct nfs_pageio_ops filelayout_pg_write_ops = {
.pg_init = filelayout_pg_init_write,
.pg_test = filelayout_pg_test,
.pg_doio = pnfs_generic_pg_writepages,
};
static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
{
if (fl->stripe_type == STRIPE_SPARSE)
return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
else
return j;
}
/* The generic layer is about to remove the req from the commit list.
* If this will make the bucket empty, it will need to put the lseg reference.
*/
static void
filelayout_clear_request_commit(struct nfs_page *req)
{
struct pnfs_layout_segment *freeme = NULL;
struct inode *inode = req->wb_context->dentry->d_inode;
spin_lock(&inode->i_lock);
if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
goto out;
if (list_is_singular(&req->wb_list)) {
struct pnfs_layout_segment *lseg;
/* From here we can find the bucket, but for the moment,
* since there is only one relevant lseg...
*/
list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
if (lseg->pls_range.iomode == IOMODE_RW) {
freeme = lseg;
break;
}
}
}
out:
nfs_request_remove_commit_list(req);
spin_unlock(&inode->i_lock);
put_lseg(freeme);
}
static struct list_head *
filelayout_choose_commit_list(struct nfs_page *req,
struct pnfs_layout_segment *lseg)
{
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
u32 i, j;
struct list_head *list;
if (fl->commit_through_mds)
return &NFS_I(req->wb_context->dentry->d_inode)->commit_list;
/* Note that we are calling nfs4_fl_calc_j_index on each page
* that ends up being committed to a data server. An attractive
* alternative is to add a field to nfs_write_data and nfs_page
* to store the value calculated in filelayout_write_pagelist
* and just use that here.
*/
j = nfs4_fl_calc_j_index(lseg,
(loff_t)req->wb_index << PAGE_CACHE_SHIFT);
i = select_bucket_index(fl, j);
list = &fl->commit_buckets[i].written;
if (list_empty(list)) {
/* Non-empty buckets hold a reference on the lseg. That ref
* is normally transferred to the COMMIT call and released
* there. It could also be released if the last req is pulled
* off due to a rewrite, in which case it will be done in
* filelayout_remove_commit_req
*/
get_lseg(lseg);
}
set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
return list;
}
static void
filelayout_mark_request_commit(struct nfs_page *req,
struct pnfs_layout_segment *lseg)
{
struct list_head *list;
list = filelayout_choose_commit_list(req, lseg);
nfs_request_add_commit_list(req, list);
}
static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
{
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
if (flseg->stripe_type == STRIPE_SPARSE)
return i;
else
return nfs4_fl_calc_ds_index(lseg, i);
}
static struct nfs_fh *
select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
{
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
if (flseg->stripe_type == STRIPE_SPARSE) {
if (flseg->num_fh == 1)
i = 0;
else if (flseg->num_fh == 0)
/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
return NULL;
}
return flseg->fh_array[i];
}
static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
u32 idx;
struct nfs_fh *fh;
idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
ds = nfs4_fl_prepare_ds(lseg, idx);
if (!ds) {
printk(KERN_ERR "NFS: %s: prepare_ds failed, use MDS\n",
__func__);
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
prepare_to_resend_writes(data);
filelayout_commit_release(data);
return -EAGAIN;
}
dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
data->write_done_cb = filelayout_commit_done_cb;
data->ds_clp = ds->ds_clp;
fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
if (fh)
data->args.fh = fh;
return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
&filelayout_commit_call_ops, how);
}
/*
* This is only useful while we are using whole file layouts.
*/
static struct pnfs_layout_segment *
find_only_write_lseg_locked(struct inode *inode)
{
struct pnfs_layout_segment *lseg;
list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
if (lseg->pls_range.iomode == IOMODE_RW)
return lseg;
return NULL;
}
static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
{
struct pnfs_layout_segment *rv;
spin_lock(&inode->i_lock);
rv = find_only_write_lseg_locked(inode);
if (rv)
get_lseg(rv);
spin_unlock(&inode->i_lock);
return rv;
}
static int
filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket *bucket, int max,
spinlock_t *lock)
{
struct list_head *src = &bucket->written;
struct list_head *dst = &bucket->committing;
struct nfs_page *req, *tmp;
int ret = 0;
list_for_each_entry_safe(req, tmp, src, wb_list) {
if (!nfs_lock_request(req))
continue;
if (cond_resched_lock(lock))
list_safe_reset_next(req, tmp, wb_list);
nfs_request_remove_commit_list(req);
clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
nfs_list_add_request(req, dst);
ret++;
if (ret == max)
break;
}
return ret;
}
/* Move reqs from written to committing lists, returning count of number moved.
* Note called with i_lock held.
*/
static int filelayout_scan_commit_lists(struct inode *inode, int max,
spinlock_t *lock)
{
struct pnfs_layout_segment *lseg;
struct nfs4_filelayout_segment *fl;
int i, rv = 0, cnt;
lseg = find_only_write_lseg_locked(inode);
if (!lseg)
goto out_done;
fl = FILELAYOUT_LSEG(lseg);
if (fl->commit_through_mds)
goto out_done;
for (i = 0; i < fl->number_of_buckets && max != 0; i++) {
cnt = filelayout_scan_ds_commit_list(&fl->commit_buckets[i],
max, lock);
max -= cnt;
rv += cnt;
}
out_done:
return rv;
}
static unsigned int
alloc_ds_commits(struct inode *inode, struct list_head *list)
{
struct pnfs_layout_segment *lseg;
struct nfs4_filelayout_segment *fl;
struct nfs_write_data *data;
int i, j;
unsigned int nreq = 0;
/* Won't need this when non-whole file layout segments are supported
* instead we will use a pnfs_layout_hdr structure */
lseg = find_only_write_lseg(inode);
if (!lseg)
return 0;