linux/fs/nfs/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 <dhildebz@umich.edu>
*
* 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 "internal.h"
#include "nfs4filelayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
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 tmp;
offset -= flseg->pattern_offset;
tmp = offset;
do_div(tmp, stripe_width);
return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
}
/* 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();
}
/* For data server errors we don't recover from */
static void
filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
{
if (lseg->pls_range.iomode == IOMODE_RW) {
dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
} else {
dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
}
}
static int filelayout_async_handle_error(struct rpc_task *task,
struct nfs4_state *state,
struct nfs_client *clp,
int *reset)
{
if (task->tk_status >= 0)
return 0;
*reset = 0;
switch (task->tk_status) {
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;
default:
dprintk("%s DS error. Retry through MDS %d\n", __func__,
task->tk_status);
*reset = 1;
break;
}
task->tk_status = 0;
return -EAGAIN;
}
/* NFS_PROTO call done callback routines */
static int filelayout_read_done_cb(struct rpc_task *task,
struct nfs_read_data *data)
{
struct nfs_client *clp = data->ds_clp;
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) {
filelayout_set_lo_fail(data->lseg);
nfs4_reset_read(task, data);
clp = NFS_SERVER(data->inode)->nfs_client;
}
nfs_restart_rpc(task, clp);
return -EAGAIN;
}
return 0;
}
/*
* 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,
0, 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_release(void *data)
{
struct nfs_read_data *rdata = (struct nfs_read_data *)data;
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) {
struct nfs_client *clp;
dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
__func__, data->ds_clp, data->ds_clp->cl_session);
if (reset) {
filelayout_set_lo_fail(data->lseg);
nfs4_reset_write(task, data);
clp = NFS_SERVER(data->inode)->nfs_client;
} else
clp = data->ds_clp;
nfs_restart_rpc(task, clp);
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,
0, 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_release(void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
wdata->mds_ops->rpc_release(data);
}
struct rpc_call_ops filelayout_read_call_ops = {
.rpc_call_prepare = filelayout_read_prepare,
.rpc_call_done = filelayout_read_call_done,
.rpc_release = filelayout_read_release,
};
struct rpc_call_ops filelayout_write_call_ops = {
.rpc_call_prepare = filelayout_write_prepare,
.rpc_call_done = filelayout_write_call_done,
.rpc_release = filelayout_write_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);
/* 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:ip %x %hu\n", __func__,
ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
/* 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;
/* 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 "%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:%x:%hu\n", __func__,
data->inode->i_ino, sync, (size_t) data->args.count, offset,
ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
/* We can't handle commit to ds yet */
if (!FILELAYOUT_LSEG(lseg)->commit_through_mds)
data->args.stable = NFS_FILE_SYNC;
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);
data->mds_offset = 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)
{
struct nfs4_file_layout_dsaddr *dsaddr;
int status = -EINVAL;
struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
dprintk("--> %s\n", __func__);
if (fl->pattern_offset > lgr->range.offset) {
dprintk("%s pattern_offset %lld to 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 */
dsaddr = nfs4_fl_find_get_deviceid(id);
if (dsaddr == NULL) {
dsaddr = get_device_info(lo->plh_inode, id);
if (dsaddr == NULL)
goto out;
}
fl->dsaddr = dsaddr;
if (fl->first_stripe_index < 0 ||
fl->first_stripe_index >= dsaddr->stripe_count) {
dprintk("%s Bad first_stripe_index %d\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)
{
uint32_t *p = (uint32_t *)lgr->layout.buf;
uint32_t nfl_util;
int i;
dprintk("%s: set_layout_map Begin\n", __func__);
memcpy(id, p, sizeof(*id));
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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);
fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
GFP_KERNEL);
if (!fl->fh_array)
return -ENOMEM;
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_KERNEL);
if (!fl->fh_array[i]) {
filelayout_free_fh_array(fl);
return -ENOMEM;
}
fl->fh_array[i]->size = be32_to_cpup(p++);
if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
printk(KERN_ERR "Too big fh %d received %d\n",
i, fl->fh_array[i]->size);
filelayout_free_fh_array(fl);
return -EIO;
}
memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
p += XDR_QUADLEN(fl->fh_array[i]->size);
dprintk("DEBUG: %s: fh len %d\n", __func__,
fl->fh_array[i]->size);
}
return 0;
}
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)
{
struct nfs4_filelayout_segment *fl;
int rc;
struct nfs4_deviceid id;
dprintk("--> %s\n", __func__);
fl = kzalloc(sizeof(*fl), GFP_KERNEL);
if (!fl)
return NULL;
rc = filelayout_decode_layout(layoutid, fl, lgr, &id);
if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) {
_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 list_head), GFP_KERNEL);
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]);
}
return &fl->generic_hdr;
}
/*
* filelayout_pg_test(). Called by nfs_can_coalesce_requests()
*
* return 1 : coalesce page
* return 0 : don't coalesce page
*/
int
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 (!pgio->pg_lseg)
return 1;
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 struct pnfs_layoutdriver_type filelayout_type = {
.id = LAYOUT_NFSV4_1_FILES,
.name = "LAYOUT_NFSV4_1_FILES",
.owner = THIS_MODULE,
.alloc_lseg = filelayout_alloc_lseg,
.free_lseg = filelayout_free_lseg,
.pg_test = filelayout_pg_test,
.read_pagelist = filelayout_read_pagelist,
.write_pagelist = filelayout_write_pagelist,
};
static int __init nfs4filelayout_init(void)
{
printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
__func__);
return pnfs_register_layoutdriver(&filelayout_type);
}
static void __exit nfs4filelayout_exit(void)
{
printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
__func__);
pnfs_unregister_layoutdriver(&filelayout_type);
}
module_init(nfs4filelayout_init);
module_exit(nfs4filelayout_exit);