- 根目录:
- fs
- nfs
- filelayout
- filelayout.c
/*
* 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 <linux/nfs_page.h>
#include <linux/module.h>
#include <linux/sunrpc/metrics.h>
#include "../nfs4session.h"
#include "../internal.h"
#include "../delegation.h"
#include "filelayout.h"
#include "../nfs4trace.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 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 void filelayout_reset_write(struct nfs_pgio_header *hdr)
{
struct rpc_task *task = &hdr->task;
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
dprintk("%s Reset task %5u for i/o through MDS "
"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
task->tk_status = pnfs_write_done_resend_to_mds(hdr);
}
}
static void filelayout_reset_read(struct nfs_pgio_header *hdr)
{
struct rpc_task *task = &hdr->task;
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
dprintk("%s Reset task %5u for i/o through MDS "
"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
task->tk_status = pnfs_read_done_resend_to_mds(hdr);
}
}
static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
{
if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
return;
pnfs_return_layout(inode);
}
static int filelayout_async_handle_error(struct rpc_task *task,
struct nfs4_state *state,
struct nfs_client *clp,
struct pnfs_layout_segment *lseg)
{
struct pnfs_layout_hdr *lo = lseg->pls_layout;
struct inode *inode = lo->plh_inode;
struct nfs_server *mds_server = NFS_SERVER(inode);
struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
struct nfs_client *mds_client = mds_server->nfs_client;
struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
if (task->tk_status >= 0)
return 0;
switch (task->tk_status) {
/* MDS state errors */
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OPENMODE:
if (state == NULL)
break;
if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
goto out_bad_stateid;
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
if (state != NULL) {
if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
goto out_bad_stateid;
}
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, task->tk_status);
break;
case -NFS4ERR_DELAY:
case -NFS4ERR_GRACE:
rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
break;
case -NFS4ERR_RETRY_UNCACHED_REP:
break;
/* Invalidate Layout errors */
case -NFS4ERR_PNFS_NO_LAYOUT:
case -ESTALE: /* mapped NFS4ERR_STALE */
case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
case -EISDIR: /* mapped NFS4ERR_ISDIR */
case -NFS4ERR_FHEXPIRED:
case -NFS4ERR_WRONG_TYPE:
dprintk("%s Invalid layout error %d\n", __func__,
task->tk_status);
/*
* Destroy layout so new i/o will get a new layout.
* Layout will not be destroyed until all current lseg
* references are put. Mark layout as invalid to resend failed
* i/o and all i/o waiting on the slot table to the MDS until
* layout is destroyed and a new valid layout is obtained.
*/
pnfs_destroy_layout(NFS_I(inode));
rpc_wake_up(&tbl->slot_tbl_waitq);
goto reset;
/* RPC connection errors */
case -ECONNREFUSED:
case -EHOSTDOWN:
case -EHOSTUNREACH:
case -ENETUNREACH:
case -EIO:
case -ETIMEDOUT:
case -EPIPE:
dprintk("%s DS connection error %d\n", __func__,
task->tk_status);
nfs4_mark_deviceid_unavailable(devid);
set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
rpc_wake_up(&tbl->slot_tbl_waitq);
/* fall through */
default:
reset:
dprintk("%s Retry through MDS. Error %d\n", __func__,
task->tk_status);
return -NFS4ERR_RESET_TO_MDS;
}
out:
task->tk_status = 0;
return -EAGAIN;
out_bad_stateid:
task->tk_status = -EIO;
return 0;
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_pgio_header *hdr)
{
int err;
trace_nfs4_pnfs_read(hdr, task->tk_status);
err = filelayout_async_handle_error(task, hdr->args.context->state,
hdr->ds_clp, hdr->lseg);
switch (err) {
case -NFS4ERR_RESET_TO_MDS:
filelayout_reset_read(hdr);
return task->tk_status;
case -EAGAIN:
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_pgio_header *hdr)
{
if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
hdr->res.verf->committed != NFS_DATA_SYNC)
return;
pnfs_set_layoutcommit(hdr);
dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
(unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
}
bool
filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
{
return filelayout_test_devid_invalid(node) ||
nfs4_test_deviceid_unavailable(node);
}
static bool
filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
{
struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
return filelayout_test_devid_unavailable(node);
}
/*
* 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_pgio_header *hdr = data;
if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
rpc_exit(task, -EIO);
return;
}
if (filelayout_reset_to_mds(hdr->lseg)) {
dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
filelayout_reset_read(hdr);
rpc_exit(task, 0);
return;
}
hdr->pgio_done_cb = filelayout_read_done_cb;
if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
&hdr->args.seq_args,
&hdr->res.seq_res,
task))
return;
if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
hdr->args.lock_context, FMODE_READ) == -EIO)
rpc_exit(task, -EIO); /* lost lock, terminate I/O */
}
static void filelayout_read_call_done(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
task->tk_status == 0) {
nfs41_sequence_done(task, &hdr->res.seq_res);
return;
}
/* Note this may cause RPC to be resent */
hdr->mds_ops->rpc_call_done(task, data);
}
static void filelayout_read_count_stats(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
}
static void filelayout_read_release(void *data)
{
struct nfs_pgio_header *hdr = data;
struct pnfs_layout_hdr *lo = hdr->lseg->pls_layout;
filelayout_fenceme(lo->plh_inode, lo);
nfs_put_client(hdr->ds_clp);
hdr->mds_ops->rpc_release(data);
}
static int filelayout_write_done_cb(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
int err;
trace_nfs4_pnfs_write(hdr, task->tk_status);
err = filelayout_async_handle_error(task, hdr->args.context->state,
hdr->ds_clp, hdr->lseg);
switch (err) {
case -NFS4ERR_RESET_TO_MDS:
filelayout_reset_write(hdr);
return task->tk_status;
case -EAGAIN:
rpc_restart_call_prepare(task);
return -EAGAIN;
}
filelayout_set_layoutcommit(hdr);
return 0;
}
/* Fake up some data that will cause nfs_commit_release to retry the writes. */
static void prepare_to_resend_writes(struct nfs_commit_data *data)
{
struct nfs_page *first = nfs_list_entry(data->pages.next);
data->task.tk_status = 0;
memcpy(&data->verf.verifier, &first->wb_verf,
sizeof(data->verf.verifier));
data->verf.verifier.data[0]++; /* ensure verifier mismatch */
}
static int filelayout_commit_done_cb(struct rpc_task *task,
struct nfs_commit_data *data)
{
int err;
trace_nfs4_pnfs_commit_ds(data, task->tk_status);
err = filelayout_async_handle_error(task, NULL, data->ds_clp,
data->lseg);
switch (err) {
case -NFS4ERR_RESET_TO_MDS:
prepare_to_resend_writes(data);
return -EAGAIN;
case -EAGAIN:
rpc_restart_call_prepare(task);
return -EAGAIN;
}
if (data->verf.committed == NFS_UNSTABLE)
pnfs_commit_set_layoutcommit(data);
return 0;
}
static void filelayout_write_prepare(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
rpc_exit(task, -EIO);
return;
}
if (filelayout_reset_to_mds(hdr->lseg)) {
dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
filelayout_reset_write(hdr);
rpc_exit(task, 0);
return;
}
if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
&hdr->args.seq_args,
&hdr->res.seq_res,
task))
return;
if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
hdr->args.lock_context, FMODE_WRITE) == -EIO)
rpc_exit(task, -EIO); /* lost lock, terminate I/O */
}
static void filelayout_write_call_done(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
task->tk_status == 0) {
nfs41_sequence_done(task, &hdr->res.seq_res);
return;
}
/* Note this may cause RPC to be resent */
hdr->mds_ops->rpc_call_done(task, data);
}
static void filelayout_write_count_stats(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
}
static void filelayout_write_release(void *data)
{
struct nfs_pgio_header *hdr = data;
struct pnfs_layout_hdr *lo = hdr->lseg->pls_layout;
filelayout_fenceme(lo->plh_inode, lo);
nfs_put_client(hdr->ds_clp);
hdr->mds_ops->rpc_release(data);
}
static void filelayout_commit_prepare(struct rpc_task *task, void *data)
{
struct nfs_commit_data *wdata = data;
nfs41_setup_sequence(wdata->ds_clp->cl_session,
&wdata->args.seq_args,
&wdata->res.seq_res,
task);
}
static void filelayout_write_commit_done(struct rpc_task *task, void *data)
{
struct nfs_commit_data *wdata = data;
/* Note this may cause RPC to be resent */
wdata->mds_ops->rpc_call_done(task, data);
}
static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
{
struct nfs_commit_data *cdata = data;
rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
}
static void filelayout_commit_release(void *calldata)
{
struct nfs_commit_data *data = calldata;
data->completion_ops->completion(data);
pnfs_put_lseg(data->lseg);
nfs_put_client(data->ds_clp);
nfs_commitdata_release(data);
}
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_commit_prepare,
.rpc_call_done = filelayout_write_commit_done,
.rpc_count_stats = filelayout_commit_count_stats,
.rpc_release = filelayout_commit_release,
};
static enum pnfs_try_status
filelayout_read_pagelist(struct nfs_pgio_header *hdr)
{
struct pnfs_layout_segment *lseg = hdr->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
loff_t offset = hdr->args.offset;
u32 j, idx;
struct nfs_fh *fh;
dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
__func__, hdr->inode->i_ino,
hdr->args.pgbase, (size_t)hdr->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)
return PNFS_NOT_ATTEMPTED;
ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
if (IS_ERR(ds_clnt))
return PNFS_NOT_ATTEMPTED;
dprintk("%s USE DS: %s cl_count %d\n", __func__,
ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
/* No multipath support. Use first DS */
atomic_inc(&ds->ds_clp->cl_count);
hdr->ds_clp = ds->ds_clp;
hdr->ds_idx = idx;
fh = nfs4_fl_select_ds_fh(lseg, j);
if (fh)
hdr->args.fh = fh;
hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
hdr->mds_offset = offset;
/* Perform an asynchronous read to ds */
nfs_initiate_pgio(ds_clnt, hdr,
&filelayout_read_call_ops, 0, RPC_TASK_SOFTCONN);
return PNFS_ATTEMPTED;
}
/* Perform async writes. */
static enum pnfs_try_status
filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
{
struct pnfs_layout_segment *lseg = hdr->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
loff_t offset = hdr->args.offset;
u32 j, idx;
struct nfs_fh *fh;
/* 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)
return PNFS_NOT_ATTEMPTED;
ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
if (IS_ERR(ds_clnt))
return PNFS_NOT_ATTEMPTED;
dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
__func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
hdr->pgio_done_cb = filelayout_write_done_cb;
atomic_inc(&ds->ds_clp->cl_count);
hdr->ds_clp = ds->ds_clp;
hdr->ds_idx = idx;
fh = nfs4_fl_select_ds_fh(lseg, j);
if (fh)
hdr->args.fh = fh;
hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
/* Perform an asynchronous write */
nfs_initiate_pgio(ds_clnt, hdr,
&filelayout_write_call_ops, sync,
RPC_TASK_SOFTCONN);
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;
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) {
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), id,
lo->plh_lc_cred, gfp_flags);
if (d == NULL)
goto out;
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
/* Found deviceid is unavailable */
if (filelayout_test_devid_unavailable(&dsaddr->id_node))
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;
}
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 = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
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);
/* This assumes a single RW lseg */
if (lseg->pls_range.iomode == IOMODE_RW) {
struct nfs4_filelayout *flo;
flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
flo->commit_info.nbuckets = 0;
kfree(flo->commit_info.buckets);
flo->commit_info.buckets = NULL;
}
_filelayout_free_lseg(fl);
}
static int
filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
struct nfs_commit_info *cinfo,
gfp_t gfp_flags)
{
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
struct pnfs_commit_bucket *buckets;
int size, i;
if (fl->commit_through_mds)
return 0;
size = (fl->stripe_type == STRIPE_SPARSE) ?
fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
if (cinfo->ds->nbuckets >= size) {
/* 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().
* */
return 0;
}
buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
gfp_flags);
if (!buckets)
return -ENOMEM;
for (i = 0; i < size; i++) {
INIT_LIST_HEAD(&buckets[i].written);
INIT_LIST_HEAD(&buckets[i].committing);
/* mark direct verifier as unset */
buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
}
spin_lock(cinfo->lock);
if (cinfo->ds->nbuckets >= size)
goto out;
for (i = 0; i < cinfo->ds->nbuckets; i++) {
list_splice(&cinfo->ds->buckets[i].written,
&buckets[i].written);
list_splice(&cinfo->ds->buckets[i].committing,
&buckets[i].committing);
buckets[i].direct_verf.committed =
cinfo->ds->buckets[i].direct_verf.committed;
buckets[i].wlseg = cinfo->ds->buckets[i].wlseg;
buckets[i].clseg = cinfo->ds->buckets[i].clseg;
}
swap(cinfo->ds->buckets, buckets);
cinfo->ds->nbuckets = size;
out:
spin_unlock(cinfo->lock);
kfree(buckets);
return 0;
}
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;
}
return &fl->generic_hdr;
}
/*
* filelayout_pg_test(). Called by nfs_can_coalesce_requests()
*
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
* of bytes (maximum @req->wb_bytes) that can be coalesced.
*/
static size_t
filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
unsigned int size;
u64 p_stripe, r_stripe;
u32 stripe_offset;
u64 segment_offset = pgio->pg_lseg->pls_range.offset;
u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
/* calls nfs_generic_pg_test */
size = pnfs_generic_pg_test(pgio, prev, req);
if (!size)
return 0;
/* see if req and prev are in the same stripe */
if (prev) {
p_stripe = (u64)req_offset(prev) - segment_offset;
r_stripe = (u64)req_offset(req) - segment_offset;
do_div(p_stripe, stripe_unit);
do_div(r_stripe, stripe_unit);
if (p_stripe != r_stripe)
return 0;
}
/* calculate remaining bytes in the current stripe */
div_u64_rem((u64)req_offset(req) - segment_offset,
stripe_unit,
&stripe_offset);
WARN_ON_ONCE(stripe_offset > stripe_unit);
if (stripe_offset >= stripe_unit)
return 0;
return min(stripe_unit - (unsigned int)stripe_offset, size);
}
static void
filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
if (!pgio->pg_lseg)
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)
{
struct nfs_commit_info cinfo;
int status;
if (!pgio->pg_lseg)
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)
goto out_mds;
nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
if (status < 0) {
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = NULL;
goto out_mds;
}
return;
out_mds:
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.
* Note this is must be called holding the inode (/cinfo) lock
*/
static void
filelayout_clear_request_commit(struct nfs_page *req,
struct nfs_commit_info *cinfo)
{
struct pnfs_layout_segment *freeme = NULL;
if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
goto out;
cinfo->ds->nwritten--;
if (list_is_singular(&req->wb_list)) {
struct pnfs_commit_bucket *bucket;
bucket = list_first_entry(&req->wb_list,
struct pnfs_commit_bucket,
written);
freeme = bucket->wlseg;
bucket->wlseg = NULL;
}
out:
nfs_request_remove_commit_list(req, cinfo);
pnfs_put_lseg_locked(freeme);
}
static void
filelayout_mark_request_commit(struct nfs_page *req,
struct pnfs_layout_segment *lseg,
struct nfs_commit_info *cinfo)
{
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
u32 i, j;
struct list_head *list;
struct pnfs_commit_bucket *buckets;
if (fl->commit_through_mds) {
list = &cinfo->mds->list;
spin_lock(cinfo->lock);
goto mds_commit;
}
/* 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, req_offset(req));
i = select_bucket_index(fl, j);
spin_lock(cinfo->lock);
buckets = cinfo->ds->buckets;
list = &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_clear_request_commit
*/
buckets[i].wlseg = pnfs_get_lseg(lseg);
}
set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
cinfo->ds->nwritten++;
mds_commit:
/* nfs_request_add_commit_list(). We need to add req to list without
* dropping cinfo lock.
*/
set_bit(PG_CLEAN, &(req)->wb_flags);
nfs_list_add_request(req, list);
cinfo->mds->ncommit++;
spin_unlock(cinfo->lock);
if (!cinfo->dreq) {
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
BDI_RECLAIMABLE);
__mark_inode_dirty(req->wb_context->dentry->d_inode,
I_DIRTY_DATASYNC);
}
}
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_commit_data *data, int how)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
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)
goto out_err;
ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
if (IS_ERR(ds_clnt))
goto out_err;
dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
data->commit_done_cb = filelayout_commit_done_cb;
atomic_inc(&ds->ds_clp->cl_count);
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(ds_clnt, data,
&filelayout_commit_call_ops, how,
RPC_TASK_SOFTCONN);
out_err:
prepare_to_resend_writes(data);
filelayout_commit_release(data);
return -EAGAIN;
}
static int
transfer_commit_list(struct list_head *src, struct list_head *dst,
struct nfs_commit_info *cinfo, int max)
{
struct nfs_page *req, *tmp;
int ret = 0;
list_for_each_entry_safe(req, tmp, src, wb_list) {
if (!nfs_lock_request(req))
continue;
kref_get(&req->wb_kref);
if (cond_resched_lock(cinfo->lock))
list_safe_reset_next(req, tmp, wb_list);
nfs_request_remove_commit_list(req, cinfo);
clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
nfs_list_add_request(req, dst);
ret++;
if ((ret == max) && !cinfo->dreq)
break;
}
return ret;
}
/* Note called with cinfo->lock held. */
static int
filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
struct nfs_commit_info *cinfo,
int max)
{
struct list_head *src = &bucket->written;
struct list_head *dst = &bucket->committing;
int ret;
ret = transfer_commit_list(src, dst, cinfo, max);
if (ret) {
cinfo->ds->nwritten -= ret;
cinfo->ds->ncommitting += ret;
bucket->clseg = bucket->wlseg;
if (list_empty(src))
bucket->wlseg = NULL;
else
pnfs_get_lseg(bucket->clseg);
}
return ret;
}
/* Move reqs from written to committing lists, returning count of number moved.
* Note called with cinfo->lock held.
*/
static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
int max)
{
int i, rv = 0, cnt;
for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
cinfo, max);
max -= cnt;
rv += cnt;
}
return rv;
}
/* Pull everything off the committing lists and dump into @dst */
static void filelayout_recover_commit_reqs(struct list_head *dst,
struct nfs_commit_info *cinfo)
{
struct pnfs_commit_bucket *b;
struct pnfs_layout_segment *freeme;
int i;
restart:
spin_lock(cinfo->lock);
for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
freeme = b->wlseg;
b->wlseg = NULL;
spin_unlock(cinfo->lock);
pnfs_put_lseg(freeme);
goto restart;
}
}
cinfo->ds->nwritten = 0;
spin_unlock(cinfo->lock);
}
/* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest
* for @page
* @cinfo - commit info for current inode
* @page - page to search for matching head request
*
* Returns a the head request if one is found, otherwise returns NULL.
*/
static struct nfs_page *
filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
{
struct nfs_page *freq, *t;
struct pnfs_commit_bucket *b;
int i;
/* Linearly search the commit lists for each bucket until a matching
* request is found */
for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
list_for_each_entry_safe(freq, t, &b->written, wb_list) {
if (freq->wb_page == page)
return freq->wb_head;
}
list_for_each_entry_safe(freq, t, &b->committing, wb_list) {
if (freq->wb_page == page)
return freq->wb_head;
}
}
return NULL;
}
static void filelayout_retry_commit(struct nfs_commit_info *cinfo, int idx)
{
struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
struct pnfs_commit_bucket *bucket;
struct pnfs_layout_segment *freeme;
int i;
for (i = idx; i < fl_cinfo->nbuckets; i++) {
bucket = &fl_cinfo->buckets[i];
if (list_empty(&bucket->committing))
continue;
nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
spin_lock(cinfo->lock);
freeme = bucket->clseg;
bucket->clseg = NULL;
spin_unlock(cinfo->lock);
pnfs_put_lseg(freeme);
}
}
static unsigned int
alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
{
struct pnfs_ds_commit_info *fl_cinfo;
struct pnfs_commit_bucket *bucket;
struct nfs_commit_data *data;
int i;
unsigned int nreq = 0;
fl_cinfo = cinfo->ds;
bucket = fl_cinfo->buckets;
for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
if (list_empty(&bucket->committing))
continue;
data = nfs_commitdata_alloc();
if (!data)
break;
data->ds_commit_index = i;
spin_lock(cinfo->lock);
data->lseg = bucket->clseg;
bucket->clseg = NULL;
spin_unlock(cinfo->lock);
list_add(&data->pages, list);
nreq++;
}
/* Clean up on error */
filelayout_retry_commit(cinfo, i);
/* Caller will clean up entries put on list */
return nreq;
}
/* This follows nfs_commit_list pretty closely */
static int
filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
int how, struct nfs_commit_info *cinfo)
{
struct nfs_commit_data *data, *tmp;
LIST_HEAD(list);
unsigned int nreq = 0;
if (!list_empty(mds_pages)) {
data = nfs_commitdata_alloc();
if (data != NULL) {
data->lseg = NULL;
list_add(&data->pages, &list);
nreq++;
} else {
nfs_retry_commit(mds_pages, NULL, cinfo);
filelayout_retry_commit(cinfo, 0);
cinfo->completion_ops->error_cleanup(NFS_I(inode));
return -ENOMEM;
}
}
nreq += alloc_ds_commits(cinfo, &list);
if (nreq == 0) {
cinfo->completion_ops->error_cleanup(NFS_I(inode));
goto out;
}
atomic_add(nreq, &cinfo->mds->rpcs_out);
list_for_each_entry_safe(data, tmp, &list, pages) {
list_del_init(&data->pages);
if (!data->lseg) {
nfs_init_commit(data, mds_pages, NULL, cinfo);
nfs_initiate_commit(NFS_CLIENT(inode), data,
data->mds_ops, how, 0);
} else {
struct pnfs_commit_bucket *buckets;
buckets = cinfo->ds->buckets;
nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
filelayout_initiate_commit(data, how);
}
}
out:
cinfo->ds->ncommitting = 0;
return PNFS_ATTEMPTED;
}
static struct nfs4_deviceid_node *
filelayout_alloc_deviceid_node(struct nfs_server *server,
struct pnfs_device *pdev, gfp_t gfp_flags)
{
struct nfs4_file_layout_dsaddr *dsaddr;
dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags);
if (!dsaddr)
return NULL;
return &dsaddr->id_node;
}
static void
filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
{
nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
}
static struct pnfs_layout_hdr *
filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
{
struct nfs4_filelayout *flo;
flo = kzalloc(sizeof(*flo), gfp_flags);
return flo != NULL ? &flo->generic_hdr : NULL;
}
static void
filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
kfree(FILELAYOUT_FROM_HDR(lo));
}
static struct pnfs_ds_commit_info *
filelayout_get_ds_info(struct inode *inode)
{
struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
if (layout == NULL)
return NULL;
else
return &FILELAYOUT_FROM_HDR(layout)->commit_info;
}
static struct pnfs_layoutdriver_type filelayout_type = {
.id = LAYOUT_NFSV4_1_FILES,
.name = "LAYOUT_NFSV4_1_FILES",
.owner = THIS_MODULE,
.alloc_layout_hdr = filelayout_alloc_layout_hdr,
.free_layout_hdr = filelayout_free_layout_hdr,
.alloc_lseg = filelayout_alloc_lseg,
.free_lseg = filelayout_free_lseg,
.pg_read_ops = &filelayout_pg_read_ops,
.pg_write_ops = &filelayout_pg_write_ops,
.get_ds_info = &filelayout_get_ds_info,
.mark_request_commit = filelayout_mark_request_commit,
.clear_request_commit = filelayout_clear_request_commit,
.scan_commit_lists = filelayout_scan_commit_lists,
.recover_commit_reqs = filelayout_recover_commit_reqs,
.search_commit_reqs = filelayout_search_commit_reqs,
.commit_pagelist = filelayout_commit_pagelist,
.read_pagelist = filelayout_read_pagelist,
.write_pagelist = filelayout_write_pagelist,
.alloc_deviceid_node = filelayout_alloc_deviceid_node,
.free_deviceid_node = filelayout_free_deveiceid_node,
};
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_ALIAS("nfs-layouttype4-1");
module_init(nfs4filelayout_init);
module_exit(nfs4filelayout_exit);