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fc7ff36747
linux/fs/nfs/pnfs.c
Trond Myklebust fc7ff36747 pNFS: If we have to delay the layout callback, mark the layout for return 
If the client needs to delay the layout callback, then speed up the recall
process by marking the remaining layout segments to be actively returned
by the client.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-12-28 14:33:04 -05:00

2422 lines
64 KiB
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/*
* pNFS functions to call and manage layout drivers.
*
* Copyright (c) 2002 [year of first publication]
* 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 "internal.h"
#include "pnfs.h"
#include "iostat.h"
#include "nfs4trace.h"
#include "delegation.h"
#include "nfs42.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
/* Locking:
*
* pnfs_spinlock:
* protects pnfs_modules_tbl.
*/
static DEFINE_SPINLOCK(pnfs_spinlock);
/*
* pnfs_modules_tbl holds all pnfs modules
*/
static LIST_HEAD(pnfs_modules_tbl);
static int
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
enum pnfs_iomode iomode, bool sync);
/* Return the registered pnfs layout driver module matching given id */
static struct pnfs_layoutdriver_type *
find_pnfs_driver_locked(u32 id)
{
struct pnfs_layoutdriver_type *local;
list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
if (local->id == id)
goto out;
local = NULL;
out:
dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
return local;
}
static struct pnfs_layoutdriver_type *
find_pnfs_driver(u32 id)
{
struct pnfs_layoutdriver_type *local;
spin_lock(&pnfs_spinlock);
local = find_pnfs_driver_locked(id);
if (local != NULL && !try_module_get(local->owner)) {
dprintk("%s: Could not grab reference on module\n", __func__);
local = NULL;
}
spin_unlock(&pnfs_spinlock);
return local;
}
void
unset_pnfs_layoutdriver(struct nfs_server *nfss)
{
if (nfss->pnfs_curr_ld) {
if (nfss->pnfs_curr_ld->clear_layoutdriver)
nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
/* Decrement the MDS count. Purge the deviceid cache if zero */
if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
nfs4_deviceid_purge_client(nfss->nfs_client);
module_put(nfss->pnfs_curr_ld->owner);
}
nfss->pnfs_curr_ld = NULL;
}
/*
* Try to set the server's pnfs module to the pnfs layout type specified by id.
* Currently only one pNFS layout driver per filesystem is supported.
*
* @id layout type. Zero (illegal layout type) indicates pNFS not in use.
*/
void
set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
u32 id)
{
struct pnfs_layoutdriver_type *ld_type = NULL;
if (id == 0)
goto out_no_driver;
if (!(server->nfs_client->cl_exchange_flags &
(EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
__func__, id, server->nfs_client->cl_exchange_flags);
goto out_no_driver;
}
ld_type = find_pnfs_driver(id);
if (!ld_type) {
request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
ld_type = find_pnfs_driver(id);
if (!ld_type) {
dprintk("%s: No pNFS module found for %u.\n",
__func__, id);
goto out_no_driver;
}
}
server->pnfs_curr_ld = ld_type;
if (ld_type->set_layoutdriver
&& ld_type->set_layoutdriver(server, mntfh)) {
printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
"driver %u.\n", __func__, id);
module_put(ld_type->owner);
goto out_no_driver;
}
/* Bump the MDS count */
atomic_inc(&server->nfs_client->cl_mds_count);
dprintk("%s: pNFS module for %u set\n", __func__, id);
return;
out_no_driver:
dprintk("%s: Using NFSv4 I/O\n", __func__);
server->pnfs_curr_ld = NULL;
}
int
pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
{
int status = -EINVAL;
struct pnfs_layoutdriver_type *tmp;
if (ld_type->id == 0) {
printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
return status;
}
if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
printk(KERN_ERR "NFS: %s Layout driver must provide "
"alloc_lseg and free_lseg.\n", __func__);
return status;
}
spin_lock(&pnfs_spinlock);
tmp = find_pnfs_driver_locked(ld_type->id);
if (!tmp) {
list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
status = 0;
dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
ld_type->name);
} else {
printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
__func__, ld_type->id);
}
spin_unlock(&pnfs_spinlock);
return status;
}
EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
void
pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
{
dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
spin_lock(&pnfs_spinlock);
list_del(&ld_type->pnfs_tblid);
spin_unlock(&pnfs_spinlock);
}
EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
/*
* pNFS client layout cache
*/
/* Need to hold i_lock if caller does not already hold reference */
void
pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
{
atomic_inc(&lo->plh_refcount);
}
static struct pnfs_layout_hdr *
pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
{
struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
return ld->alloc_layout_hdr(ino, gfp_flags);
}
static void
pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct nfs_server *server = NFS_SERVER(lo->plh_inode);
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
if (!list_empty(&lo->plh_layouts)) {
struct nfs_client *clp = server->nfs_client;
spin_lock(&clp->cl_lock);
list_del_init(&lo->plh_layouts);
spin_unlock(&clp->cl_lock);
}
put_rpccred(lo->plh_lc_cred);
return ld->free_layout_hdr(lo);
}
static void
pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
dprintk("%s: freeing layout cache %p\n", __func__, lo);
nfsi->layout = NULL;
/* Reset MDS Threshold I/O counters */
nfsi->write_io = 0;
nfsi->read_io = 0;
}
void
pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct inode *inode = lo->plh_inode;
if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
if (!list_empty(&lo->plh_segs))
WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
pnfs_detach_layout_hdr(lo);
spin_unlock(&inode->i_lock);
pnfs_free_layout_hdr(lo);
}
}
static int
pnfs_iomode_to_fail_bit(u32 iomode)
{
return iomode == IOMODE_RW ?
NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
}
static void
pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
{
lo->plh_retry_timestamp = jiffies;
if (!test_and_set_bit(fail_bit, &lo->plh_flags))
atomic_inc(&lo->plh_refcount);
}
static void
pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
{
if (test_and_clear_bit(fail_bit, &lo->plh_flags))
atomic_dec(&lo->plh_refcount);
}
static void
pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
{
struct inode *inode = lo->plh_inode;
struct pnfs_layout_range range = {
.iomode = iomode,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
LIST_HEAD(head);
spin_lock(&inode->i_lock);
pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
spin_unlock(&inode->i_lock);
pnfs_free_lseg_list(&head);
dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
iomode == IOMODE_RW ? "RW" : "READ");
}
static bool
pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
{
unsigned long start, end;
int fail_bit = pnfs_iomode_to_fail_bit(iomode);
if (test_bit(fail_bit, &lo->plh_flags) == 0)
return false;
end = jiffies;
start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
/* It is time to retry the failed layoutgets */
pnfs_layout_clear_fail_bit(lo, fail_bit);
return false;
}
return true;
}
static void
init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
{
INIT_LIST_HEAD(&lseg->pls_list);
INIT_LIST_HEAD(&lseg->pls_lc_list);
atomic_set(&lseg->pls_refcount, 1);
smp_mb();
set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
lseg->pls_layout = lo;
}
static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
{
struct inode *ino = lseg->pls_layout->plh_inode;
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
}
static void
pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg)
{
struct inode *inode = lo->plh_inode;
WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
list_del_init(&lseg->pls_list);
/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
atomic_dec(&lo->plh_refcount);
if (list_empty(&lo->plh_segs))
clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
}
/* Return true if layoutreturn is needed */
static bool
pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg)
{
struct pnfs_layout_segment *s;
if (!test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
return false;
list_for_each_entry(s, &lo->plh_segs, pls_list)
if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
return false;
return true;
}
static bool
pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
{
if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
return false;
lo->plh_return_iomode = 0;
pnfs_get_layout_hdr(lo);
clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
return true;
}
static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
struct pnfs_layout_hdr *lo, struct inode *inode)
{
lo = lseg->pls_layout;
inode = lo->plh_inode;
spin_lock(&inode->i_lock);
if (pnfs_layout_need_return(lo, lseg)) {
nfs4_stateid stateid;
enum pnfs_iomode iomode;
bool send;
stateid = lo->plh_stateid;
iomode = lo->plh_return_iomode;
send = pnfs_prepare_layoutreturn(lo);
spin_unlock(&inode->i_lock);
if (send) {
/* Send an async layoutreturn so we dont deadlock */
pnfs_send_layoutreturn(lo, stateid, iomode, false);
}
} else
spin_unlock(&inode->i_lock);
}
void
pnfs_put_lseg(struct pnfs_layout_segment *lseg)
{
struct pnfs_layout_hdr *lo;
struct inode *inode;
if (!lseg)
return;
dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
atomic_read(&lseg->pls_refcount),
test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
/* Handle the case where refcount != 1 */
if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
return;
lo = lseg->pls_layout;
inode = lo->plh_inode;
/* Do we need a layoutreturn? */
if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
pnfs_layoutreturn_before_put_lseg(lseg, lo, inode);
if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
spin_unlock(&inode->i_lock);
return;
}
pnfs_get_layout_hdr(lo);
pnfs_layout_remove_lseg(lo, lseg);
spin_unlock(&inode->i_lock);
pnfs_free_lseg(lseg);
pnfs_put_layout_hdr(lo);
}
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg);
static void pnfs_free_lseg_async_work(struct work_struct *work)
{
struct pnfs_layout_segment *lseg;
struct pnfs_layout_hdr *lo;
lseg = container_of(work, struct pnfs_layout_segment, pls_work);
lo = lseg->pls_layout;
pnfs_free_lseg(lseg);
pnfs_put_layout_hdr(lo);
}
static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
{
INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
schedule_work(&lseg->pls_work);
}
void
pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
{
if (!lseg)
return;
assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
atomic_read(&lseg->pls_refcount),
test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
if (atomic_dec_and_test(&lseg->pls_refcount)) {
struct pnfs_layout_hdr *lo = lseg->pls_layout;
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
return;
pnfs_get_layout_hdr(lo);
pnfs_layout_remove_lseg(lo, lseg);
pnfs_free_lseg_async(lseg);
}
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
static u64
end_offset(u64 start, u64 len)
{
u64 end;
end = start + len;
return end >= start ? end : NFS4_MAX_UINT64;
}
/*
* is l2 fully contained in l1?
* start1 end1
* [----------------------------------)
* start2 end2
* [----------------)
*/
static bool
pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 start1 = l1->offset;
u64 end1 = end_offset(start1, l1->length);
u64 start2 = l2->offset;
u64 end2 = end_offset(start2, l2->length);
return (start1 <= start2) && (end1 >= end2);
}
/*
* is l1 and l2 intersecting?
* start1 end1
* [----------------------------------)
* start2 end2
* [----------------)
*/
static bool
pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 start1 = l1->offset;
u64 end1 = end_offset(start1, l1->length);
u64 start2 = l2->offset;
u64 end2 = end_offset(start2, l2->length);
return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
(end2 == NFS4_MAX_UINT64 || end2 > start1);
}
static bool
should_free_lseg(const struct pnfs_layout_range *lseg_range,
const struct pnfs_layout_range *recall_range)
{
return (recall_range->iomode == IOMODE_ANY ||
lseg_range->iomode == recall_range->iomode) &&
pnfs_lseg_range_intersecting(lseg_range, recall_range);
}
static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
struct list_head *tmp_list)
{
if (!atomic_dec_and_test(&lseg->pls_refcount))
return false;
pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
list_add(&lseg->pls_list, tmp_list);
return true;
}
/* Returns 1 if lseg is removed from list, 0 otherwise */
static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
struct list_head *tmp_list)
{
int rv = 0;
if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
/* Remove the reference keeping the lseg in the
* list. It will now be removed when all
* outstanding io is finished.
*/
dprintk("%s: lseg %p ref %d\n", __func__, lseg,
atomic_read(&lseg->pls_refcount));
if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
rv = 1;
}
return rv;
}
/* Returns count of number of matching invalid lsegs remaining in list
* after call.
*/
int
pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
struct pnfs_layout_range *recall_range)
{
struct pnfs_layout_segment *lseg, *next;
int invalid = 0, removed = 0;
dprintk("%s:Begin lo %p\n", __func__, lo);
if (list_empty(&lo->plh_segs))
return 0;
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
if (!recall_range ||
should_free_lseg(&lseg->pls_range, recall_range)) {
dprintk("%s: freeing lseg %p iomode %d "
"offset %llu length %llu\n", __func__,
lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
lseg->pls_range.length);
invalid++;
removed += mark_lseg_invalid(lseg, tmp_list);
}
dprintk("%s:Return %i\n", __func__, invalid - removed);
return invalid - removed;
}
/* note free_me must contain lsegs from a single layout_hdr */
void
pnfs_free_lseg_list(struct list_head *free_me)
{
struct pnfs_layout_segment *lseg, *tmp;
if (list_empty(free_me))
return;
list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
list_del(&lseg->pls_list);
pnfs_free_lseg(lseg);
}
}
void
pnfs_destroy_layout(struct nfs_inode *nfsi)
{
struct pnfs_layout_hdr *lo;
LIST_HEAD(tmp_list);
spin_lock(&nfsi->vfs_inode.i_lock);
lo = nfsi->layout;
if (lo) {
lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
pnfs_get_layout_hdr(lo);
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
pnfs_clear_retry_layoutget(lo);
spin_unlock(&nfsi->vfs_inode.i_lock);
pnfs_free_lseg_list(&tmp_list);
pnfs_put_layout_hdr(lo);
} else
spin_unlock(&nfsi->vfs_inode.i_lock);
}
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
static bool
pnfs_layout_add_bulk_destroy_list(struct inode *inode,
struct list_head *layout_list)
{
struct pnfs_layout_hdr *lo;
bool ret = false;
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
pnfs_get_layout_hdr(lo);
list_add(&lo->plh_bulk_destroy, layout_list);
ret = true;
}
spin_unlock(&inode->i_lock);
return ret;
}
/* Caller must hold rcu_read_lock and clp->cl_lock */
static int
pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
struct nfs_server *server,
struct list_head *layout_list)
{
struct pnfs_layout_hdr *lo, *next;
struct inode *inode;
list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
inode = igrab(lo->plh_inode);
if (inode == NULL)
continue;
list_del_init(&lo->plh_layouts);
if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
continue;
rcu_read_unlock();
spin_unlock(&clp->cl_lock);
iput(inode);
spin_lock(&clp->cl_lock);
rcu_read_lock();
return -EAGAIN;
}
return 0;
}
static int
pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
bool is_bulk_recall)
{
struct pnfs_layout_hdr *lo;
struct inode *inode;
struct pnfs_layout_range range = {
.iomode = IOMODE_ANY,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
LIST_HEAD(lseg_list);
int ret = 0;
while (!list_empty(layout_list)) {
lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
plh_bulk_destroy);
dprintk("%s freeing layout for inode %lu\n", __func__,
lo->plh_inode->i_ino);
inode = lo->plh_inode;
pnfs_layoutcommit_inode(inode, false);
spin_lock(&inode->i_lock);
list_del_init(&lo->plh_bulk_destroy);
lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
if (is_bulk_recall)
set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
ret = -EAGAIN;
spin_unlock(&inode->i_lock);
pnfs_free_lseg_list(&lseg_list);
pnfs_put_layout_hdr(lo);
iput(inode);
}
return ret;
}
int
pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
struct nfs_fsid *fsid,
bool is_recall)
{
struct nfs_server *server;
LIST_HEAD(layout_list);
spin_lock(&clp->cl_lock);
rcu_read_lock();
restart:
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
continue;
if (pnfs_layout_bulk_destroy_byserver_locked(clp,
server,
&layout_list) != 0)
goto restart;
}
rcu_read_unlock();
spin_unlock(&clp->cl_lock);
if (list_empty(&layout_list))
return 0;
return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
}
int
pnfs_destroy_layouts_byclid(struct nfs_client *clp,
bool is_recall)
{
struct nfs_server *server;
LIST_HEAD(layout_list);
spin_lock(&clp->cl_lock);
rcu_read_lock();
restart:
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
if (pnfs_layout_bulk_destroy_byserver_locked(clp,
server,
&layout_list) != 0)
goto restart;
}
rcu_read_unlock();
spin_unlock(&clp->cl_lock);
if (list_empty(&layout_list))
return 0;
return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
}
/*
* Called by the state manger to remove all layouts established under an
* expired lease.
*/
void
pnfs_destroy_all_layouts(struct nfs_client *clp)
{
nfs4_deviceid_mark_client_invalid(clp);
nfs4_deviceid_purge_client(clp);
pnfs_destroy_layouts_byclid(clp, false);
}
/*
* Compare 2 layout stateid sequence ids, to see which is newer,
* taking into account wraparound issues.
*/
static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
{
return (s32)(s1 - s2) > 0;
}
/* update lo->plh_stateid with new if is more recent */
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
bool update_barrier)
{
u32 oldseq, newseq, new_barrier;
int empty = list_empty(&lo->plh_segs);
oldseq = be32_to_cpu(lo->plh_stateid.seqid);
newseq = be32_to_cpu(new->seqid);
if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
nfs4_stateid_copy(&lo->plh_stateid, new);
if (update_barrier) {
new_barrier = be32_to_cpu(new->seqid);
} else {
/* Because of wraparound, we want to keep the barrier
* "close" to the current seqids.
*/
new_barrier = newseq - atomic_read(&lo->plh_outstanding);
}
if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
lo->plh_barrier = new_barrier;
}
}
static bool
pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
const nfs4_stateid *stateid)
{
u32 seqid = be32_to_cpu(stateid->seqid);
return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
}
/* lget is set to 1 if called from inside send_layoutget call chain */
static bool
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
{
return lo->plh_block_lgets ||
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
}
int
pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
struct pnfs_layout_range *range,
struct nfs4_state *open_state)
{
int status = 0;
dprintk("--> %s\n", __func__);
spin_lock(&lo->plh_inode->i_lock);
if (pnfs_layoutgets_blocked(lo)) {
status = -EAGAIN;
} else if (!nfs4_valid_open_stateid(open_state)) {
status = -EBADF;
} else if (list_empty(&lo->plh_segs) ||
test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
int seq;
do {
seq = read_seqbegin(&open_state->seqlock);
nfs4_stateid_copy(dst, &open_state->stateid);
} while (read_seqretry(&open_state->seqlock, seq));
} else
nfs4_stateid_copy(dst, &lo->plh_stateid);
spin_unlock(&lo->plh_inode->i_lock);
dprintk("<-- %s\n", __func__);
return status;
}
/*
* Get layout from server.
* for now, assume that whole file layouts are requested.
* arg->offset: 0
* arg->length: all ones
*/
static struct pnfs_layout_segment *
send_layoutget(struct pnfs_layout_hdr *lo,
struct nfs_open_context *ctx,
struct pnfs_layout_range *range,
gfp_t gfp_flags)
{
struct inode *ino = lo->plh_inode;
struct nfs_server *server = NFS_SERVER(ino);
struct nfs4_layoutget *lgp;
struct pnfs_layout_segment *lseg;
loff_t i_size;
dprintk("--> %s\n", __func__);
/*
* Synchronously retrieve layout information from server and
* store in lseg. If we race with a concurrent seqid morphing
* op, then re-send the LAYOUTGET.
*/
do {
lgp = kzalloc(sizeof(*lgp), gfp_flags);
if (lgp == NULL)
return NULL;
i_size = i_size_read(ino);
lgp->args.minlength = PAGE_CACHE_SIZE;
if (lgp->args.minlength > range->length)
lgp->args.minlength = range->length;
if (range->iomode == IOMODE_READ) {
if (range->offset >= i_size)
lgp->args.minlength = 0;
else if (i_size - range->offset < lgp->args.minlength)
lgp->args.minlength = i_size - range->offset;
}
lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
lgp->args.range = *range;
lgp->args.type = server->pnfs_curr_ld->id;
lgp->args.inode = ino;
lgp->args.ctx = get_nfs_open_context(ctx);
lgp->gfp_flags = gfp_flags;
lgp->cred = lo->plh_lc_cred;
lseg = nfs4_proc_layoutget(lgp, gfp_flags);
} while (lseg == ERR_PTR(-EAGAIN));
if (IS_ERR(lseg)) {
switch (PTR_ERR(lseg)) {
case -ENOMEM:
case -ERESTARTSYS:
break;
default:
/* remember that LAYOUTGET failed and suspend trying */
pnfs_layout_io_set_failed(lo, range->iomode);
}
return NULL;
} else
pnfs_layout_clear_fail_bit(lo,
pnfs_iomode_to_fail_bit(range->iomode));
return lseg;
}
static void pnfs_clear_layoutcommit(struct inode *inode,
struct list_head *head)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct pnfs_layout_segment *lseg, *tmp;
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
return;
list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
continue;
pnfs_lseg_dec_and_remove_zero(lseg, head);
}
}
void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
{
clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
smp_mb__after_atomic();
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
}
static int
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
enum pnfs_iomode iomode, bool sync)
{
struct inode *ino = lo->plh_inode;
struct nfs4_layoutreturn *lrp;
int status = 0;
lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
if (unlikely(lrp == NULL)) {
status = -ENOMEM;
spin_lock(&ino->i_lock);
pnfs_clear_layoutreturn_waitbit(lo);
spin_unlock(&ino->i_lock);
pnfs_put_layout_hdr(lo);
goto out;
}
lrp->args.stateid = stateid;
lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
lrp->args.inode = ino;
lrp->args.range.iomode = iomode;
lrp->args.range.offset = 0;
lrp->args.range.length = NFS4_MAX_UINT64;
lrp->args.layout = lo;
lrp->clp = NFS_SERVER(ino)->nfs_client;
lrp->cred = lo->plh_lc_cred;
status = nfs4_proc_layoutreturn(lrp, sync);
out:
dprintk("<-- %s status: %d\n", __func__, status);
return status;
}
/*
* Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
* when the layout segment list is empty.
*
* Note that a pnfs_layout_hdr can exist with an empty layout segment
* list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
* deviceid is marked invalid.
*/
int
_pnfs_return_layout(struct inode *ino)
{
struct pnfs_layout_hdr *lo = NULL;
struct nfs_inode *nfsi = NFS_I(ino);
LIST_HEAD(tmp_list);
nfs4_stateid stateid;
int status = 0, empty;
bool send;
dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
spin_lock(&ino->i_lock);
lo = nfsi->layout;
if (!lo) {
spin_unlock(&ino->i_lock);
dprintk("NFS: %s no layout to return\n", __func__);
goto out;
}
stateid = nfsi->layout->plh_stateid;
/* Reference matched in nfs4_layoutreturn_release */
pnfs_get_layout_hdr(lo);
empty = list_empty(&lo->plh_segs);
pnfs_clear_layoutcommit(ino, &tmp_list);
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
struct pnfs_layout_range range = {
.iomode = IOMODE_ANY,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
}
/* Don't send a LAYOUTRETURN if list was initially empty */
if (empty) {
spin_unlock(&ino->i_lock);
dprintk("NFS: %s no layout segments to return\n", __func__);
goto out_put_layout_hdr;
}
set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
send = pnfs_prepare_layoutreturn(lo);
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&tmp_list);
if (send)
status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
out_put_layout_hdr:
pnfs_put_layout_hdr(lo);
out:
dprintk("<-- %s status: %d\n", __func__, status);
return status;
}
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
int
pnfs_commit_and_return_layout(struct inode *inode)
{
struct pnfs_layout_hdr *lo;
int ret;
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (lo == NULL) {
spin_unlock(&inode->i_lock);
return 0;
}
pnfs_get_layout_hdr(lo);
/* Block new layoutgets and read/write to ds */
lo->plh_block_lgets++;
spin_unlock(&inode->i_lock);
filemap_fdatawait(inode->i_mapping);
ret = pnfs_layoutcommit_inode(inode, true);
if (ret == 0)
ret = _pnfs_return_layout(inode);
spin_lock(&inode->i_lock);
lo->plh_block_lgets--;
spin_unlock(&inode->i_lock);
pnfs_put_layout_hdr(lo);
return ret;
}
bool pnfs_roc(struct inode *ino)
{
struct nfs_inode *nfsi = NFS_I(ino);
struct nfs_open_context *ctx;
struct nfs4_state *state;
struct pnfs_layout_hdr *lo;
struct pnfs_layout_segment *lseg, *tmp;
nfs4_stateid stateid;
LIST_HEAD(tmp_list);
bool found = false, layoutreturn = false, roc = false;
spin_lock(&ino->i_lock);
lo = nfsi->layout;
if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
goto out_noroc;
/* no roc if we hold a delegation */
if (nfs4_check_delegation(ino, FMODE_READ))
goto out_noroc;
list_for_each_entry(ctx, &nfsi->open_files, list) {
state = ctx->state;
/* Don't return layout if there is open file state */
if (state != NULL && state->state != 0)
goto out_noroc;
}
stateid = lo->plh_stateid;
/* always send layoutreturn if being marked so */
if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
&lo->plh_flags))
layoutreturn = pnfs_prepare_layoutreturn(lo);
pnfs_clear_retry_layoutget(lo);
list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
/* If we are sending layoutreturn, invalidate all valid lsegs */
if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
mark_lseg_invalid(lseg, &tmp_list);
found = true;
}
/* ROC in two conditions:
* 1. there are ROC lsegs
* 2. we don't send layoutreturn
*/
if (found && !layoutreturn) {
/* lo ref dropped in pnfs_roc_release() */
pnfs_get_layout_hdr(lo);
roc = true;
}
out_noroc:
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&tmp_list);
pnfs_layoutcommit_inode(ino, true);
if (layoutreturn)
pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
return roc;
}
void pnfs_roc_release(struct inode *ino)
{
struct pnfs_layout_hdr *lo;
spin_lock(&ino->i_lock);
lo = NFS_I(ino)->layout;
pnfs_clear_layoutreturn_waitbit(lo);
if (atomic_dec_and_test(&lo->plh_refcount)) {
pnfs_detach_layout_hdr(lo);
spin_unlock(&ino->i_lock);
pnfs_free_layout_hdr(lo);
} else
spin_unlock(&ino->i_lock);
}
void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
{
struct pnfs_layout_hdr *lo;
spin_lock(&ino->i_lock);
lo = NFS_I(ino)->layout;
pnfs_mark_layout_returned_if_empty(lo);
if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
lo->plh_barrier = barrier;
spin_unlock(&ino->i_lock);
trace_nfs4_layoutreturn_on_close(ino, 0);
}
void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
{
struct nfs_inode *nfsi = NFS_I(ino);
struct pnfs_layout_hdr *lo;
u32 current_seqid;
spin_lock(&ino->i_lock);
lo = nfsi->layout;
current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
/* Since close does not return a layout stateid for use as
* a barrier, we choose the worst-case barrier.
*/
*barrier = current_seqid + atomic_read(&lo->plh_outstanding);
spin_unlock(&ino->i_lock);
}
bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
{
struct nfs_inode *nfsi = NFS_I(ino);
struct pnfs_layout_hdr *lo;
bool sleep = false;
/* we might not have grabbed lo reference. so need to check under
* i_lock */
spin_lock(&ino->i_lock);
lo = nfsi->layout;
if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
sleep = true;
spin_unlock(&ino->i_lock);
if (sleep)
rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
return sleep;
}
/*
* Compare two layout segments for sorting into layout cache.
* We want to preferentially return RW over RO layouts, so ensure those
* are seen first.
*/
static s64
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
s64 d;
/* high offset > low offset */
d = l1->offset - l2->offset;
if (d)
return d;
/* short length > long length */
d = l2->length - l1->length;
if (d)
return d;
/* read > read/write */
return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
}
static bool
pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
return pnfs_lseg_range_cmp(l1, l2) > 0;
}
static bool
pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
struct pnfs_layout_segment *old)
{
return false;
}
void
pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg,
bool (*is_after)(const struct pnfs_layout_range *,
const struct pnfs_layout_range *),
bool (*do_merge)(struct pnfs_layout_segment *,
struct pnfs_layout_segment *),
struct list_head *free_me)
{
struct pnfs_layout_segment *lp, *tmp;
dprintk("%s:Begin\n", __func__);
list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
continue;
if (do_merge(lseg, lp)) {
mark_lseg_invalid(lp, free_me);
continue;
}
if (is_after(&lseg->pls_range, &lp->pls_range))
continue;
list_add_tail(&lseg->pls_list, &lp->pls_list);
dprintk("%s: inserted lseg %p "
"iomode %d offset %llu length %llu before "
"lp %p iomode %d offset %llu length %llu\n",
__func__, lseg, lseg->pls_range.iomode,
lseg->pls_range.offset, lseg->pls_range.length,
lp, lp->pls_range.iomode, lp->pls_range.offset,
lp->pls_range.length);
goto out;
}
list_add_tail(&lseg->pls_list, &lo->plh_segs);
dprintk("%s: inserted lseg %p "
"iomode %d offset %llu length %llu at tail\n",
__func__, lseg, lseg->pls_range.iomode,
lseg->pls_range.offset, lseg->pls_range.length);
out:
pnfs_get_layout_hdr(lo);
dprintk("%s:Return\n", __func__);
}
EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
static void
pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg,
struct list_head *free_me)
{
struct inode *inode = lo->plh_inode;
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
if (ld->add_lseg != NULL)
ld->add_lseg(lo, lseg, free_me);
else
pnfs_generic_layout_insert_lseg(lo, lseg,
pnfs_lseg_range_is_after,
pnfs_lseg_no_merge,
free_me);
}
static struct pnfs_layout_hdr *
alloc_init_layout_hdr(struct inode *ino,
struct nfs_open_context *ctx,
gfp_t gfp_flags)
{
struct pnfs_layout_hdr *lo;
lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
if (!lo)
return NULL;
atomic_set(&lo->plh_refcount, 1);
INIT_LIST_HEAD(&lo->plh_layouts);
INIT_LIST_HEAD(&lo->plh_segs);
INIT_LIST_HEAD(&lo->plh_bulk_destroy);
lo->plh_inode = ino;
lo->plh_lc_cred = get_rpccred(ctx->cred);
return lo;
}
static struct pnfs_layout_hdr *
pnfs_find_alloc_layout(struct inode *ino,
struct nfs_open_context *ctx,
gfp_t gfp_flags)
{
struct nfs_inode *nfsi = NFS_I(ino);
struct pnfs_layout_hdr *new = NULL;
dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
if (nfsi->layout != NULL)
goto out_existing;
spin_unlock(&ino->i_lock);
new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
spin_lock(&ino->i_lock);
if (likely(nfsi->layout == NULL)) { /* Won the race? */
nfsi->layout = new;
return new;
} else if (new != NULL)
pnfs_free_layout_hdr(new);
out_existing:
pnfs_get_layout_hdr(nfsi->layout);
return nfsi->layout;
}
/*
* iomode matching rules:
* iomode lseg match
* ----- ----- -----
* ANY READ true
* ANY RW true
* RW READ false
* RW RW true
* READ READ true
* READ RW true
*/
static bool
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
const struct pnfs_layout_range *range)
{
struct pnfs_layout_range range1;
if ((range->iomode == IOMODE_RW &&
ls_range->iomode != IOMODE_RW) ||
!pnfs_lseg_range_intersecting(ls_range, range))
return 0;
/* range1 covers only the first byte in the range */
range1 = *range;
range1.length = 1;
return pnfs_lseg_range_contained(ls_range, &range1);
}
/*
* lookup range in layout
*/
static struct pnfs_layout_segment *
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_range *range)
{
struct pnfs_layout_segment *lseg, *ret = NULL;
dprintk("%s:Begin\n", __func__);
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
pnfs_lseg_range_match(&lseg->pls_range, range)) {
ret = pnfs_get_lseg(lseg);
break;
}
}
dprintk("%s:Return lseg %p ref %d\n",
__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
return ret;
}
/*
* Use mdsthreshold hints set at each OPEN to determine if I/O should go
* to the MDS or over pNFS
*
* The nfs_inode read_io and write_io fields are cumulative counters reset
* when there are no layout segments. Note that in pnfs_update_layout iomode
* is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
* WRITE request.
*
* A return of true means use MDS I/O.
*
* From rfc 5661:
* If a file's size is smaller than the file size threshold, data accesses
* SHOULD be sent to the metadata server. If an I/O request has a length that
* is below the I/O size threshold, the I/O SHOULD be sent to the metadata
* server. If both file size and I/O size are provided, the client SHOULD
* reach or exceed both thresholds before sending its read or write
* requests to the data server.
*/
static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
struct inode *ino, int iomode)
{
struct nfs4_threshold *t = ctx->mdsthreshold;
struct nfs_inode *nfsi = NFS_I(ino);
loff_t fsize = i_size_read(ino);
bool size = false, size_set = false, io = false, io_set = false, ret = false;
if (t == NULL)
return ret;
dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
__func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
switch (iomode) {
case IOMODE_READ:
if (t->bm & THRESHOLD_RD) {
dprintk("%s fsize %llu\n", __func__, fsize);
size_set = true;
if (fsize < t->rd_sz)
size = true;
}
if (t->bm & THRESHOLD_RD_IO) {
dprintk("%s nfsi->read_io %llu\n", __func__,
nfsi->read_io);
io_set = true;
if (nfsi->read_io < t->rd_io_sz)
io = true;
}
break;
case IOMODE_RW:
if (t->bm & THRESHOLD_WR) {
dprintk("%s fsize %llu\n", __func__, fsize);
size_set = true;
if (fsize < t->wr_sz)
size = true;
}
if (t->bm & THRESHOLD_WR_IO) {
dprintk("%s nfsi->write_io %llu\n", __func__,
nfsi->write_io);
io_set = true;
if (nfsi->write_io < t->wr_io_sz)
io = true;
}
break;
}
if (size_set && io_set) {
if (size && io)
ret = true;
} else if (size || io)
ret = true;
dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
return ret;
}
/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key, int mode)
{
if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
return 1;
return nfs_wait_bit_killable(key, mode);
}
static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
{
if (!pnfs_should_retry_layoutget(lo))
return false;
/*
* send layoutcommit as it can hold up layoutreturn due to lseg
* reference
*/
pnfs_layoutcommit_inode(lo->plh_inode, false);
return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
pnfs_layoutget_retry_bit_wait,
TASK_UNINTERRUPTIBLE);
}
static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
{
unsigned long *bitlock = &lo->plh_flags;
clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
smp_mb__after_atomic();
wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
}
/*
* Layout segment is retreived from the server if not cached.
* The appropriate layout segment is referenced and returned to the caller.
*/
struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino,
struct nfs_open_context *ctx,
loff_t pos,
u64 count,
enum pnfs_iomode iomode,
gfp_t gfp_flags)
{
struct pnfs_layout_range arg = {
.iomode = iomode,
.offset = pos,
.length = count,
};
unsigned pg_offset;
struct nfs_server *server = NFS_SERVER(ino);
struct nfs_client *clp = server->nfs_client;
struct pnfs_layout_hdr *lo;
struct pnfs_layout_segment *lseg = NULL;
bool first;
if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
PNFS_UPDATE_LAYOUT_NO_PNFS);
goto out;
}
if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
goto out;
}
if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
PNFS_UPDATE_LAYOUT_MDSTHRESH);
goto out;
}
lookup_again:
first = false;
spin_lock(&ino->i_lock);
lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
if (lo == NULL) {
spin_unlock(&ino->i_lock);
trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
PNFS_UPDATE_LAYOUT_NOMEM);
goto out;
}
/* Do we even need to bother with this? */
if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_BULK_RECALL);
dprintk("%s matches recall, use MDS\n", __func__);
goto out_unlock;
}
/* if LAYOUTGET already failed once we don't try again */
if (pnfs_layout_io_test_failed(lo, iomode) &&
!pnfs_should_retry_layoutget(lo)) {
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
goto out_unlock;
}
first = list_empty(&lo->plh_segs);
if (first) {
/* The first layoutget for the file. Need to serialize per
* RFC 5661 Errata 3208.
*/
if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
&lo->plh_flags)) {
spin_unlock(&ino->i_lock);
wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
TASK_UNINTERRUPTIBLE);
pnfs_put_layout_hdr(lo);
goto lookup_again;
}
} else {
/* Check to see if the layout for the given range
* already exists
*/
lseg = pnfs_find_lseg(lo, &arg);
if (lseg) {
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_FOUND_CACHED);
goto out_unlock;
}
}
/*
* Because we free lsegs before sending LAYOUTRETURN, we need to wait
* for LAYOUTRETURN even if first is true.
*/
if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
spin_unlock(&ino->i_lock);
dprintk("%s wait for layoutreturn\n", __func__);
if (pnfs_prepare_to_retry_layoutget(lo)) {
if (first)
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
dprintk("%s retrying\n", __func__);
goto lookup_again;
}
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_RETURN);
goto out_put_layout_hdr;
}
if (pnfs_layoutgets_blocked(lo)) {
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_BLOCKED);
goto out_unlock;
}
atomic_inc(&lo->plh_outstanding);
spin_unlock(&ino->i_lock);
if (list_empty(&lo->plh_layouts)) {
/* The lo must be on the clp list if there is any
* chance of a CB_LAYOUTRECALL(FILE) coming in.
*/
spin_lock(&clp->cl_lock);
if (list_empty(&lo->plh_layouts))
list_add_tail(&lo->plh_layouts, &server->layouts);
spin_unlock(&clp->cl_lock);
}
pg_offset = arg.offset & ~PAGE_CACHE_MASK;
if (pg_offset) {
arg.offset -= pg_offset;
arg.length += pg_offset;
}
if (arg.length != NFS4_MAX_UINT64)
arg.length = PAGE_CACHE_ALIGN(arg.length);
lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
pnfs_clear_retry_layoutget(lo);
atomic_dec(&lo->plh_outstanding);
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
out_put_layout_hdr:
if (first)
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
out:
dprintk("%s: inode %s/%llu pNFS layout segment %s for "
"(%s, offset: %llu, length: %llu)\n",
__func__, ino->i_sb->s_id,
(unsigned long long)NFS_FILEID(ino),
lseg == NULL ? "not found" : "found",
iomode==IOMODE_RW ? "read/write" : "read-only",
(unsigned long long)pos,
(unsigned long long)count);
return lseg;
out_unlock:
spin_unlock(&ino->i_lock);
goto out_put_layout_hdr;
}
EXPORT_SYMBOL_GPL(pnfs_update_layout);
static bool
pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
{
switch (range->iomode) {
case IOMODE_READ:
case IOMODE_RW:
break;
default:
return false;
}
if (range->offset == NFS4_MAX_UINT64)
return false;
if (range->length == 0)
return false;
if (range->length != NFS4_MAX_UINT64 &&
range->length > NFS4_MAX_UINT64 - range->offset)
return false;
return true;
}
struct pnfs_layout_segment *
pnfs_layout_process(struct nfs4_layoutget *lgp)
{
struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
struct nfs4_layoutget_res *res = &lgp->res;
struct pnfs_layout_segment *lseg;
struct inode *ino = lo->plh_inode;
LIST_HEAD(free_me);
int status = -EINVAL;
if (!pnfs_sanity_check_layout_range(&res->range))
goto out;
/* Inject layout blob into I/O device driver */
lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
if (!lseg || IS_ERR(lseg)) {
if (!lseg)
status = -ENOMEM;
else
status = PTR_ERR(lseg);
dprintk("%s: Could not allocate layout: error %d\n",
__func__, status);
goto out;
}
init_lseg(lo, lseg);
lseg->pls_range = res->range;
spin_lock(&ino->i_lock);
if (pnfs_layoutgets_blocked(lo)) {
dprintk("%s forget reply due to state\n", __func__);
goto out_forget_reply;
}
if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
/* existing state ID, make sure the sequence number matches. */
if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
dprintk("%s forget reply due to sequence\n", __func__);
status = -EAGAIN;
goto out_forget_reply;
}
pnfs_set_layout_stateid(lo, &res->stateid, false);
} else {
/*
* We got an entirely new state ID. Mark all segments for the
* inode invalid, and don't bother validating the stateid
* sequence number.
*/
pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
}
clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
pnfs_get_lseg(lseg);
pnfs_layout_insert_lseg(lo, lseg, &free_me);
if (res->return_on_close)
set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&free_me);
return lseg;
out:
return ERR_PTR(status);
out_forget_reply:
spin_unlock(&ino->i_lock);
lseg->pls_layout = lo;
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
goto out;
}
void
pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
struct pnfs_layout_range *return_range)
{
struct pnfs_layout_segment *lseg, *next;
dprintk("%s:Begin lo %p\n", __func__, lo);
if (list_empty(&lo->plh_segs))
return;
assert_spin_locked(&lo->plh_inode->i_lock);
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
if (should_free_lseg(&lseg->pls_range, return_range)) {
dprintk("%s: marking lseg %p iomode %d "
"offset %llu length %llu\n", __func__,
lseg, lseg->pls_range.iomode,
lseg->pls_range.offset,
lseg->pls_range.length);
set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
mark_lseg_invalid(lseg, tmp_list);
set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
&lo->plh_flags);
}
}
void pnfs_error_mark_layout_for_return(struct inode *inode,
struct pnfs_layout_segment *lseg)
{
struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode);
struct pnfs_layout_range range = {
.iomode = lseg->pls_range.iomode,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
LIST_HEAD(free_me);
spin_lock(&inode->i_lock);
/* set failure bit so that pnfs path will be retried later */
pnfs_layout_set_fail_bit(lo, iomode);
if (lo->plh_return_iomode == 0)
lo->plh_return_iomode = range.iomode;
else if (lo->plh_return_iomode != range.iomode)
lo->plh_return_iomode = IOMODE_ANY;
/*
* mark all matching lsegs so that we are sure to have no live
* segments at hand when sending layoutreturn. See pnfs_put_lseg()
* for how it works.
*/
pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
spin_unlock(&inode->i_lock);
pnfs_free_lseg_list(&free_me);
}
EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
u64 rd_size = req->wb_bytes;
if (pgio->pg_lseg == NULL) {
if (pgio->pg_dreq == NULL)
rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
else
rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
req_offset(req),
rd_size,
IOMODE_READ,
GFP_KERNEL);
}
/* If no lseg, fall back to read through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_read_mds(pgio);
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
void
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req, u64 wb_size)
{
if (pgio->pg_lseg == NULL)
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
req->wb_context,
req_offset(req),
wb_size,
IOMODE_RW,
GFP_NOFS);
/* If no lseg, fall back to write through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_write_mds(pgio);
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
void
pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
{
if (desc->pg_lseg) {
pnfs_put_lseg(desc->pg_lseg);
desc->pg_lseg = NULL;
}
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
/*
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
* of bytes (maximum @req->wb_bytes) that can be coalesced.
*/
size_t
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
struct nfs_page *prev, struct nfs_page *req)
{
unsigned int size;
u64 seg_end, req_start, seg_left;
size = nfs_generic_pg_test(pgio, prev, req);
if (!size)
return 0;
/*
* 'size' contains the number of bytes left in the current page (up
* to the original size asked for in @req->wb_bytes).
*
* Calculate how many bytes are left in the layout segment
* and if there are less bytes than 'size', return that instead.
*
* Please also note that 'end_offset' is actually the offset of the
* first byte that lies outside the pnfs_layout_range. FIXME?
*
*/
if (pgio->pg_lseg) {
seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
pgio->pg_lseg->pls_range.length);
req_start = req_offset(req);
WARN_ON_ONCE(req_start >= seg_end);
/* start of request is past the last byte of this segment */
if (req_start >= seg_end) {
/* reference the new lseg */
if (pgio->pg_ops->pg_cleanup)
pgio->pg_ops->pg_cleanup(pgio);
if (pgio->pg_ops->pg_init)
pgio->pg_ops->pg_init(pgio, req);
return 0;
}
/* adjust 'size' iff there are fewer bytes left in the
* segment than what nfs_generic_pg_test returned */
seg_left = seg_end - req_start;
if (seg_left < size)
size = (unsigned int)seg_left;
}
return size;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
{
struct nfs_pageio_descriptor pgio;
/* Resend all requests through the MDS */
nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
hdr->completion_ops);
set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
return nfs_pageio_resend(&pgio, hdr);
}
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
{
dprintk("pnfs write error = %d\n", hdr->pnfs_error);
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR) {
pnfs_return_layout(hdr->inode);
}
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
}
/*
* Called by non rpc-based layout drivers
*/
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
{
if (likely(!hdr->pnfs_error)) {
pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
hdr->mds_offset + hdr->res.count);
hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
}
trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
if (unlikely(hdr->pnfs_error))
pnfs_ld_handle_write_error(hdr);
hdr->mds_ops->rpc_release(hdr);
}
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
nfs_pageio_reset_write_mds(desc);
mirror->pg_recoalesce = 1;
}
nfs_pgio_data_destroy(hdr);
hdr->release(hdr);
}
static enum pnfs_try_status
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
const struct rpc_call_ops *call_ops,
struct pnfs_layout_segment *lseg,
int how)
{
struct inode *inode = hdr->inode;
enum pnfs_try_status trypnfs;
struct nfs_server *nfss = NFS_SERVER(inode);
hdr->mds_ops = call_ops;
dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
inode->i_ino, hdr->args.count, hdr->args.offset, how);
trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
if (trypnfs != PNFS_NOT_ATTEMPTED)
nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
return trypnfs;
}
static void
pnfs_do_write(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr, int how)
{
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
struct pnfs_layout_segment *lseg = desc->pg_lseg;
enum pnfs_try_status trypnfs;
trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
if (trypnfs == PNFS_NOT_ATTEMPTED)
pnfs_write_through_mds(desc, hdr);
}
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
{
pnfs_put_lseg(hdr->lseg);
nfs_pgio_header_free(hdr);
}
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
}
nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ret = nfs_generic_pgio(desc, hdr);
if (!ret)
pnfs_do_write(desc, hdr, desc->pg_ioflags);
return ret;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
{
struct nfs_pageio_descriptor pgio;
/* Resend all requests through the MDS */
nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
return nfs_pageio_resend(&pgio, hdr);
}
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
{
dprintk("pnfs read error = %d\n", hdr->pnfs_error);
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_ERROR) {
pnfs_return_layout(hdr->inode);
}
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
}
/*
* Called by non rpc-based layout drivers
*/
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
{
if (likely(!hdr->pnfs_error)) {
__nfs4_read_done_cb(hdr);
hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
}
trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
if (unlikely(hdr->pnfs_error))
pnfs_ld_handle_read_error(hdr);
hdr->mds_ops->rpc_release(hdr);
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
nfs_pageio_reset_read_mds(desc);
mirror->pg_recoalesce = 1;
}
nfs_pgio_data_destroy(hdr);
hdr->release(hdr);
}
/*
* Call the appropriate parallel I/O subsystem read function.
*/
static enum pnfs_try_status
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
const struct rpc_call_ops *call_ops,
struct pnfs_layout_segment *lseg)
{
struct inode *inode = hdr->inode;
struct nfs_server *nfss = NFS_SERVER(inode);
enum pnfs_try_status trypnfs;
hdr->mds_ops = call_ops;
dprintk("%s: Reading ino:%lu %u@%llu\n",
__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
if (trypnfs != PNFS_NOT_ATTEMPTED)
nfs_inc_stats(inode, NFSIOS_PNFS_READ);
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
return trypnfs;
}
/* Resend all requests through pnfs. */
int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
{
struct nfs_pageio_descriptor pgio;
nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
return nfs_pageio_resend(&pgio, hdr);
}
EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
static void
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
{
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
struct pnfs_layout_segment *lseg = desc->pg_lseg;
enum pnfs_try_status trypnfs;
int err = 0;
trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
if (trypnfs == PNFS_TRY_AGAIN)
err = pnfs_read_resend_pnfs(hdr);
if (trypnfs == PNFS_NOT_ATTEMPTED || err)
pnfs_read_through_mds(desc, hdr);
}
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
{
pnfs_put_lseg(hdr->lseg);
nfs_pgio_header_free(hdr);
}
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
}
nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ret = nfs_generic_pgio(desc, hdr);
if (!ret)
pnfs_do_read(desc, hdr);
return ret;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
static void pnfs_clear_layoutcommitting(struct inode *inode)
{
unsigned long *bitlock = &NFS_I(inode)->flags;
clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
smp_mb__after_atomic();
wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
}
/*
* There can be multiple RW segments.
*/
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
{
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 &&
test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
list_add(&lseg->pls_lc_list, listp);
}
}
static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
{
struct pnfs_layout_segment *lseg, *tmp;
/* Matched by references in pnfs_set_layoutcommit */
list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
list_del_init(&lseg->pls_lc_list);
pnfs_put_lseg(lseg);
}
pnfs_clear_layoutcommitting(inode);
}
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
{
pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
}
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
void
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
loff_t end_pos)
{
struct nfs_inode *nfsi = NFS_I(inode);
bool mark_as_dirty = false;
spin_lock(&inode->i_lock);
if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
nfsi->layout->plh_lwb = end_pos;
mark_as_dirty = true;
dprintk("%s: Set layoutcommit for inode %lu ",
__func__, inode->i_ino);
} else if (end_pos > nfsi->layout->plh_lwb)
nfsi->layout->plh_lwb = end_pos;
if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
/* references matched in nfs4_layoutcommit_release */
pnfs_get_lseg(lseg);
}
spin_unlock(&inode->i_lock);
dprintk("%s: lseg %p end_pos %llu\n",
__func__, lseg, nfsi->layout->plh_lwb);
/* if pnfs_layoutcommit_inode() runs between inode locks, the next one
* will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
if (mark_as_dirty)
mark_inode_dirty_sync(inode);
}
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
{
struct nfs_server *nfss = NFS_SERVER(data->args.inode);
if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
}
/*
* For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
* NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
* data to disk to allow the server to recover the data if it crashes.
* LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
* is off, and a COMMIT is sent to a data server, or
* if WRITEs to a data server return NFS_DATA_SYNC.
*/
int
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
{
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
struct nfs4_layoutcommit_data *data;
struct nfs_inode *nfsi = NFS_I(inode);
loff_t end_pos;
int status;
if (!pnfs_layoutcommit_outstanding(inode))
return 0;
dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
status = -EAGAIN;
if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
if (!sync)
goto out;
status = wait_on_bit_lock_action(&nfsi->flags,
NFS_INO_LAYOUTCOMMITTING,
nfs_wait_bit_killable,
TASK_KILLABLE);
if (status)
goto out;
}
status = -ENOMEM;
/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
data = kzalloc(sizeof(*data), GFP_NOFS);
if (!data)
goto clear_layoutcommitting;
status = 0;
spin_lock(&inode->i_lock);
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
goto out_unlock;
INIT_LIST_HEAD(&data->lseg_list);
pnfs_list_write_lseg(inode, &data->lseg_list);
end_pos = nfsi->layout->plh_lwb;
nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
spin_unlock(&inode->i_lock);
data->args.inode = inode;
data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
nfs_fattr_init(&data->fattr);
data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
data->res.fattr = &data->fattr;
data->args.lastbytewritten = end_pos - 1;
data->res.server = NFS_SERVER(inode);
if (ld->prepare_layoutcommit) {
status = ld->prepare_layoutcommit(&data->args);
if (status) {
put_rpccred(data->cred);
spin_lock(&inode->i_lock);
set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
if (end_pos > nfsi->layout->plh_lwb)
nfsi->layout->plh_lwb = end_pos;
goto out_unlock;
}
}
status = nfs4_proc_layoutcommit(data, sync);
out:
if (status)
mark_inode_dirty_sync(inode);
dprintk("<-- %s status %d\n", __func__, status);
return status;
out_unlock:
spin_unlock(&inode->i_lock);
kfree(data);
clear_layoutcommitting:
pnfs_clear_layoutcommitting(inode);
goto out;
}
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
int
pnfs_generic_sync(struct inode *inode, bool datasync)
{
return pnfs_layoutcommit_inode(inode, true);
}
EXPORT_SYMBOL_GPL(pnfs_generic_sync);
struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
{
struct nfs4_threshold *thp;
thp = kzalloc(sizeof(*thp), GFP_NOFS);
if (!thp) {
dprintk("%s mdsthreshold allocation failed\n", __func__);
return NULL;
}
return thp;
}
#if IS_ENABLED(CONFIG_NFS_V4_2)
int
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
{
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs42_layoutstat_data *data;
struct pnfs_layout_hdr *hdr;
int status = 0;
if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
goto out;
if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
goto out;
if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
goto out;
spin_lock(&inode->i_lock);
if (!NFS_I(inode)->layout) {
spin_unlock(&inode->i_lock);
goto out;
}
hdr = NFS_I(inode)->layout;
pnfs_get_layout_hdr(hdr);
spin_unlock(&inode->i_lock);
data = kzalloc(sizeof(*data), gfp_flags);
if (!data) {
status = -ENOMEM;
goto out_put;
}
data->args.fh = NFS_FH(inode);
data->args.inode = inode;
nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
status = ld->prepare_layoutstats(&data->args);
if (status)
goto out_free;
status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
out:
dprintk("%s returns %d\n", __func__, status);
return status;
out_free:
kfree(data);
out_put:
pnfs_put_layout_hdr(hdr);
smp_mb__before_atomic();
clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
smp_mb__after_atomic();
goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
#endif
unsigned int layoutstats_timer;
module_param(layoutstats_timer, uint, 0644);
EXPORT_SYMBOL_GPL(layoutstats_timer);
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