pnfs.c 66.3 KB
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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>
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#include <linux/nfs_page.h>
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#include <linux/module.h>
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#include "internal.h"
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#include "pnfs.h"
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#include "iostat.h"
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#include "nfs4trace.h"
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#include "delegation.h"
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#include "nfs42.h"
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#define NFSDBG_FACILITY		NFSDBG_PNFS
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#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
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/* 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);

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static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
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/* 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;
}

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static struct pnfs_layoutdriver_type *
find_pnfs_driver(u32 id)
{
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	struct pnfs_layoutdriver_type *local;

	spin_lock(&pnfs_spinlock);
	local = find_pnfs_driver_locked(id);
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	if (local != NULL && !try_module_get(local->owner)) {
		dprintk("%s: Could not grab reference on module\n", __func__);
		local = NULL;
	}
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	spin_unlock(&pnfs_spinlock);
	return local;
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}

void
unset_pnfs_layoutdriver(struct nfs_server *nfss)
{
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	if (nfss->pnfs_curr_ld) {
		if (nfss->pnfs_curr_ld->clear_layoutdriver)
			nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
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		/* 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);
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		module_put(nfss->pnfs_curr_ld->owner);
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	}
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	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
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set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
		      u32 id)
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{
	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))) {
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		printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
			__func__, id, server->nfs_client->cl_exchange_flags);
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		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;
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	if (ld_type->set_layoutdriver
	    && ld_type->set_layoutdriver(server, mntfh)) {
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		printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
			"driver %u.\n", __func__, id);
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		module_put(ld_type->owner);
		goto out_no_driver;
	}
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	/* Bump the MDS count */
	atomic_inc(&server->nfs_client->cl_mds_count);
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	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;
}
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int
pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
{
	int status = -EINVAL;
	struct pnfs_layoutdriver_type *tmp;

	if (ld_type->id == 0) {
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		printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
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		return status;
	}
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	if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
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		printk(KERN_ERR "NFS: %s Layout driver must provide "
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		       "alloc_lseg and free_lseg.\n", __func__);
		return status;
	}
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	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 {
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		printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
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			__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);
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/*
 * pNFS client layout cache
 */

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/* Need to hold i_lock if caller does not already hold reference */
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void
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pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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	atomic_inc(&lo->plh_refcount);
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}

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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;
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	return ld->alloc_layout_hdr(ino, gfp_flags);
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}

static void
pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
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	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);
	}
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	put_rpccred(lo->plh_lc_cred);
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	return ld->free_layout_hdr(lo);
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}

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static void
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pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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	struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
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	dprintk("%s: freeing layout cache %p\n", __func__, lo);
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	nfsi->layout = NULL;
	/* Reset MDS Threshold I/O counters */
	nfsi->write_io = 0;
	nfsi->read_io = 0;
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}

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void
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pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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	struct inode *inode = lo->plh_inode;

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	pnfs_layoutreturn_before_put_layout_hdr(lo);

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	if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
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		if (!list_empty(&lo->plh_segs))
			WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
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		pnfs_detach_layout_hdr(lo);
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		spin_unlock(&inode->i_lock);
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		pnfs_free_layout_hdr(lo);
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	}
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}

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/*
 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
 *
 * In order to continue using the pnfs_layout_hdr, a full recovery
 * is required.
 * Note that caller must hold inode->i_lock.
 */
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static int
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pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
		struct list_head *lseg_list)
{
	struct pnfs_layout_range range = {
		.iomode = IOMODE_ANY,
		.offset = 0,
		.length = NFS4_MAX_UINT64,
	};

	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
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	return pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range, 0);
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}

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static int
pnfs_iomode_to_fail_bit(u32 iomode)
{
	return iomode == IOMODE_RW ?
		NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
}

static void
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pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
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{
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	lo->plh_retry_timestamp = jiffies;
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	if (!test_and_set_bit(fail_bit, &lo->plh_flags))
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		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;
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	struct pnfs_layout_range range = {
		.iomode = iomode,
		.offset = 0,
		.length = NFS4_MAX_UINT64,
	};
	LIST_HEAD(head);
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	spin_lock(&inode->i_lock);
	pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
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	pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
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	spin_unlock(&inode->i_lock);
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	pnfs_free_lseg_list(&head);
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	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)
{
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	unsigned long start, end;
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	int fail_bit = pnfs_iomode_to_fail_bit(iomode);

	if (test_bit(fail_bit, &lo->plh_flags) == 0)
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		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 */
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		pnfs_layout_clear_fail_bit(lo, fail_bit);
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		return false;
	}
	return true;
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}

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static void
init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
{
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	INIT_LIST_HEAD(&lseg->pls_list);
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	INIT_LIST_HEAD(&lseg->pls_lc_list);
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	atomic_set(&lseg->pls_refcount, 1);
	smp_mb();
	set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
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	lseg->pls_layout = lo;
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}

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static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
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{
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	struct inode *ino = lseg->pls_layout->plh_inode;
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	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
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}

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static void
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pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
		struct pnfs_layout_segment *lseg)
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{
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	struct inode *inode = lo->plh_inode;
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	WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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	list_del_init(&lseg->pls_list);
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	/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
	atomic_dec(&lo->plh_refcount);
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	if (list_empty(&lo->plh_segs)) {
		set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
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		clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
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	}
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	rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
}

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void
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pnfs_put_lseg(struct pnfs_layout_segment *lseg)
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{
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	struct pnfs_layout_hdr *lo;
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	struct inode *inode;

	if (!lseg)
		return;

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	dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
		atomic_read(&lseg->pls_refcount),
		test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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	lo = lseg->pls_layout;
	inode = lo->plh_inode;
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	if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
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		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
			spin_unlock(&inode->i_lock);
			return;
		}
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		pnfs_get_layout_hdr(lo);
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		pnfs_layout_remove_lseg(lo, lseg);
		spin_unlock(&inode->i_lock);
		pnfs_free_lseg(lseg);
		pnfs_put_layout_hdr(lo);
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	}
}
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EXPORT_SYMBOL_GPL(pnfs_put_lseg);
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static void pnfs_free_lseg_async_work(struct work_struct *work)
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{
	struct pnfs_layout_segment *lseg;
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	struct pnfs_layout_hdr *lo;
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	lseg = container_of(work, struct pnfs_layout_segment, pls_work);
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	lo = lseg->pls_layout;
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	pnfs_free_lseg(lseg);
	pnfs_put_layout_hdr(lo);
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}

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static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
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{
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	INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
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	schedule_work(&lseg->pls_work);
}
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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;
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		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
			return;
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		pnfs_get_layout_hdr(lo);
		pnfs_layout_remove_lseg(lo, lseg);
		pnfs_free_lseg_async(lseg);
	}
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
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static u64
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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
 *           [----------------)
 */
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static bool
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pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
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		 const struct pnfs_layout_range *l2)
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{
	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
 *                              [----------------)
 */
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static bool
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pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
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		    const struct pnfs_layout_range *l2)
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{
	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);
}

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static bool
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should_free_lseg(const struct pnfs_layout_range *lseg_range,
		 const struct pnfs_layout_range *recall_range)
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{
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	return (recall_range->iomode == IOMODE_ANY ||
		lseg_range->iomode == recall_range->iomode) &&
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	       pnfs_lseg_range_intersecting(lseg_range, recall_range);
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}

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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;
}

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/* 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.
		 */
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		dprintk("%s: lseg %p ref %d\n", __func__, lseg,
			atomic_read(&lseg->pls_refcount));
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		if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
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			rv = 1;
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	}
	return rv;
}

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/*
 * 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;
}

/**
 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
 * @lo: layout header containing the lsegs
 * @tmp_list: list head where doomed lsegs should go
 * @recall_range: optional recall range argument to match (may be NULL)
 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
 *
 * Walk the list of lsegs in the layout header, and tear down any that should
 * be destroyed. If "recall_range" is specified then the segment must match
 * that range. If "seq" is non-zero, then only match segments that were handed
 * out at or before that sequence.
 *
 * Returns number of matching invalid lsegs remaining in list after scanning
 * it and purging them.
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 */
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int
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pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
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			    struct list_head *tmp_list,
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			    const struct pnfs_layout_range *recall_range,
			    u32 seq)
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{
	struct pnfs_layout_segment *lseg, *next;
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	int remaining = 0;
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	dprintk("%s:Begin lo %p\n", __func__, lo);

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	if (list_empty(&lo->plh_segs))
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		return 0;
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	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
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		if (!recall_range ||
		    should_free_lseg(&lseg->pls_range, recall_range)) {
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			if (seq && pnfs_seqid_is_newer(lseg->pls_seq, seq))
				continue;
			dprintk("%s: freeing lseg %p iomode %d seq %u"
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				"offset %llu length %llu\n", __func__,
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				lseg, lseg->pls_range.iomode, lseg->pls_seq,
				lseg->pls_range.offset, lseg->pls_range.length);
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			if (!mark_lseg_invalid(lseg, tmp_list))
				remaining++;
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		}
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	dprintk("%s:Return %i\n", __func__, remaining);
	return remaining;
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}

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/* note free_me must contain lsegs from a single layout_hdr */
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void
582
pnfs_free_lseg_list(struct list_head *free_me)
583
{
584
	struct pnfs_layout_segment *lseg, *tmp;
585 586 587 588

	if (list_empty(free_me))
		return;

589
	list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
590
		list_del(&lseg->pls_list);
591
		pnfs_free_lseg(lseg);
592 593 594
	}
}

595 596 597 598
void
pnfs_destroy_layout(struct nfs_inode *nfsi)
{
	struct pnfs_layout_hdr *lo;
599
	LIST_HEAD(tmp_list);
600 601 602 603

	spin_lock(&nfsi->vfs_inode.i_lock);
	lo = nfsi->layout;
	if (lo) {
604
		pnfs_get_layout_hdr(lo);
605
		pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
606 607 608 609 610 611 612
		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
		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);
613
}
614
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
615

616 617 618
static bool
pnfs_layout_add_bulk_destroy_list(struct inode *inode,
		struct list_head *layout_list)
619 620
{
	struct pnfs_layout_hdr *lo;
621
	bool ret = false;
622

623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
	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;
	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;
675 676 677

		pnfs_layoutcommit_inode(inode, false);

678 679
		spin_lock(&inode->i_lock);
		list_del_init(&lo->plh_bulk_destroy);
680 681 682
		if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
			if (is_bulk_recall)
				set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
683
			ret = -EAGAIN;
684
		}
685 686
		spin_unlock(&inode->i_lock);
		pnfs_free_lseg_list(&lseg_list);
687 688
		/* Free all lsegs that are attached to commit buckets */
		nfs_commit_inode(inode, 0);
689 690 691 692 693 694 695 696 697 698 699 700 701
		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);
702

703
	spin_lock(&clp->cl_lock);
704
	rcu_read_lock();
705
restart:
706
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
707 708 709 710 711 712
		if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
			continue;
		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
				server,
				&layout_list) != 0)
			goto restart;
713 714
	}
	rcu_read_unlock();
715 716
	spin_unlock(&clp->cl_lock);

717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
	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;
737
	}
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
	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);
757 758
}

759
/* update lo->plh_stateid with new if is more recent */
F
Fred Isaman 已提交
760 761 762
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
			bool update_barrier)
763
{
764 765
	u32 oldseq, newseq, new_barrier;
	int empty = list_empty(&lo->plh_segs);
766

767 768
	oldseq = be32_to_cpu(lo->plh_stateid.seqid);
	newseq = be32_to_cpu(new->seqid);
769
	if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
770
		nfs4_stateid_copy(&lo->plh_stateid, new);
F
Fred Isaman 已提交
771
		if (update_barrier) {
772
			new_barrier = be32_to_cpu(new->seqid);
F
Fred Isaman 已提交
773 774
		} else {
			/* Because of wraparound, we want to keep the barrier
775
			 * "close" to the current seqids.
F
Fred Isaman 已提交
776
			 */
777
			new_barrier = newseq - atomic_read(&lo->plh_outstanding);
F
Fred Isaman 已提交
778
		}
779 780
		if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
			lo->plh_barrier = new_barrier;
F
Fred Isaman 已提交
781
	}
782 783
}

784
static bool
785 786
pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
		const nfs4_stateid *stateid)
F
Fred Isaman 已提交
787
{
788
	u32 seqid = be32_to_cpu(stateid->seqid);
789

790 791 792 793 794
	return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
}

/* lget is set to 1 if called from inside send_layoutget call chain */
static bool
795
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
796
{
F
Fred Isaman 已提交
797
	return lo->plh_block_lgets ||
798
		test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
799 800
}

801
/*
802 803 804 805 806
 * Get layout from server.
 *    for now, assume that whole file layouts are requested.
 *    arg->offset: 0
 *    arg->length: all ones
 */
807 808 809
static struct pnfs_layout_segment *
send_layoutget(struct pnfs_layout_hdr *lo,
	   struct nfs_open_context *ctx,
810
	   nfs4_stateid *stateid,
811
	   const struct pnfs_layout_range *range,
812
	   long *timeout, gfp_t gfp_flags)
813
{
814
	struct inode *ino = lo->plh_inode;
815 816
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs4_layoutget *lgp;
817
	loff_t i_size;
818 819

	dprintk("--> %s\n", __func__);
820

821 822 823 824 825
	/*
	 * Synchronously retrieve layout information from server and
	 * store in lseg. If we race with a concurrent seqid morphing
	 * op, then re-send the LAYOUTGET.
	 */
826 827 828 829 830 831 832 833 834 835 836 837 838 839
	lgp = kzalloc(sizeof(*lgp), gfp_flags);
	if (lgp == NULL)
		return ERR_PTR(-ENOMEM);

	i_size = i_size_read(ino);

	lgp->args.minlength = PAGE_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;
840
	}
841 842 843 844 845
	lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
	pnfs_copy_range(&lgp->args.range, range);
	lgp->args.type = server->pnfs_curr_ld->id;
	lgp->args.inode = ino;
	lgp->args.ctx = get_nfs_open_context(ctx);
846
	nfs4_stateid_copy(&lgp->args.stateid, stateid);
847 848
	lgp->gfp_flags = gfp_flags;
	lgp->cred = lo->plh_lc_cred;
849

850
	return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
851 852
}

853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
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);
	}
}

868 869 870 871 872
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);
873
	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
874 875
}

876 877 878 879 880 881 882 883
static void
pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
{
	lo->plh_return_iomode = 0;
	lo->plh_return_seq = 0;
	clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
}

884 885 886 887 888 889
static bool
pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
{
	if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
		return false;
	pnfs_get_layout_hdr(lo);
890
	pnfs_clear_layoutreturn_info(lo);
891 892 893
	return true;
}

894
static int
895
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
896
		       enum pnfs_iomode iomode, bool sync)
897 898 899 900 901
{
	struct inode *ino = lo->plh_inode;
	struct nfs4_layoutreturn *lrp;
	int status = 0;

902
	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
903 904 905
	if (unlikely(lrp == NULL)) {
		status = -ENOMEM;
		spin_lock(&ino->i_lock);
906
		pnfs_clear_layoutreturn_waitbit(lo);
907 908 909 910 911
		spin_unlock(&ino->i_lock);
		pnfs_put_layout_hdr(lo);
		goto out;
	}

912
	nfs4_stateid_copy(&lrp->args.stateid, stateid);
913 914
	lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
	lrp->args.inode = ino;
P
Peng Tao 已提交
915 916 917
	lrp->args.range.iomode = iomode;
	lrp->args.range.offset = 0;
	lrp->args.range.length = NFS4_MAX_UINT64;
918 919 920 921
	lrp->args.layout = lo;
	lrp->clp = NFS_SERVER(ino)->nfs_client;
	lrp->cred = lo->plh_lc_cred;

922
	status = nfs4_proc_layoutreturn(lrp, sync);
923 924 925 926 927
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}

928 929 930 931 932 933
/* Return true if layoutreturn is needed */
static bool
pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
{
	struct pnfs_layout_segment *s;

934
	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
		return false;

	/* Defer layoutreturn until all lsegs are done */
	list_for_each_entry(s, &lo->plh_segs, pls_list) {
		if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
			return false;
	}

	return true;
}

static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
{
	struct inode *inode= lo->plh_inode;

950
	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
951 952 953 954 955 956 957 958
		return;
	spin_lock(&inode->i_lock);
	if (pnfs_layout_need_return(lo)) {
		nfs4_stateid stateid;
		enum pnfs_iomode iomode;
		bool send;

		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
959
		stateid.seqid = cpu_to_be32(lo->plh_return_seq);
960 961 962 963 964 965 966 967 968 969 970
		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);
}

971 972 973 974 975 976 977 978
/*
 * 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.
 */
B
Benny Halevy 已提交
979 980 981 982 983 984 985
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;
986
	int status = 0, empty;
987
	bool send;
B
Benny Halevy 已提交
988

989
	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
B
Benny Halevy 已提交
990 991 992

	spin_lock(&ino->i_lock);
	lo = nfsi->layout;
993
	if (!lo) {
B
Benny Halevy 已提交
994
		spin_unlock(&ino->i_lock);
995 996
		dprintk("NFS: %s no layout to return\n", __func__);
		goto out;
B
Benny Halevy 已提交
997
	}
998
	nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid);
B
Benny Halevy 已提交
999
	/* Reference matched in nfs4_layoutreturn_release */
1000
	pnfs_get_layout_hdr(lo);
1001
	empty = list_empty(&lo->plh_segs);
1002
	pnfs_clear_layoutcommit(ino, &tmp_list);
1003
	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013

	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);
	}

1014 1015 1016 1017
	/* 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__);
1018
		goto out_put_layout_hdr;
1019
	}
1020 1021

	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1022
	send = pnfs_prepare_layoutreturn(lo);
B
Benny Halevy 已提交
1023 1024
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&tmp_list);
1025
	if (send)
1026
		status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1027 1028
out_put_layout_hdr:
	pnfs_put_layout_hdr(lo);
B
Benny Halevy 已提交
1029 1030 1031 1032
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}
1033
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
B
Benny Halevy 已提交
1034

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
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;
}

F
Fred Isaman 已提交
1062 1063
bool pnfs_roc(struct inode *ino)
{
1064 1065 1066
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
F
Fred Isaman 已提交
1067 1068
	struct pnfs_layout_hdr *lo;
	struct pnfs_layout_segment *lseg, *tmp;
1069
	nfs4_stateid stateid;
F
Fred Isaman 已提交
1070
	LIST_HEAD(tmp_list);
1071
	bool found = false, layoutreturn = false, roc = false;
F
Fred Isaman 已提交
1072 1073

	spin_lock(&ino->i_lock);
1074
	lo = nfsi->layout;
P
Peng Tao 已提交
1075
	if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1076 1077
		goto out_noroc;

1078
	/* no roc if we hold a delegation */
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	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;
	}

1089
	nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1090
	/* always send layoutreturn if being marked so */
1091
	if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED,
1092 1093 1094
				   &lo->plh_flags))
		layoutreturn = pnfs_prepare_layoutreturn(lo);

F
Fred Isaman 已提交
1095
	list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1096 1097
		/* If we are sending layoutreturn, invalidate all valid lsegs */
		if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
F
Fred Isaman 已提交
1098 1099 1100
			mark_lseg_invalid(lseg, &tmp_list);
			found = true;
		}
1101
	/* ROC in two conditions:
1102 1103 1104
	 * 1. there are ROC lsegs
	 * 2. we don't send layoutreturn
	 */
1105 1106 1107
	if (found && !layoutreturn) {
		/* lo ref dropped in pnfs_roc_release() */
		pnfs_get_layout_hdr(lo);
1108
		roc = true;
1109
	}
F
Fred Isaman 已提交
1110

1111
out_noroc:
F
Fred Isaman 已提交
1112
	spin_unlock(&ino->i_lock);
1113 1114 1115
	pnfs_free_lseg_list(&tmp_list);
	pnfs_layoutcommit_inode(ino, true);
	if (layoutreturn)
1116
		pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1117
	return roc;
F
Fred Isaman 已提交
1118 1119 1120 1121 1122 1123 1124 1125
}

void pnfs_roc_release(struct inode *ino)
{
	struct pnfs_layout_hdr *lo;

	spin_lock(&ino->i_lock);
	lo = NFS_I(ino)->layout;
1126
	pnfs_clear_layoutreturn_waitbit(lo);
1127 1128 1129 1130 1131 1132
	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);
F
Fred Isaman 已提交
1133 1134 1135 1136 1137 1138 1139 1140
}

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;
1141
	pnfs_mark_layout_returned_if_empty(lo);
1142
	if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
F
Fred Isaman 已提交
1143 1144
		lo->plh_barrier = barrier;
	spin_unlock(&ino->i_lock);
1145
	trace_nfs4_layoutreturn_on_close(ino, 0);
F
Fred Isaman 已提交
1146 1147
}

1148
void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
F
Fred Isaman 已提交
1149 1150
{
	struct nfs_inode *nfsi = NFS_I(ino);
1151 1152
	struct pnfs_layout_hdr *lo;
	u32 current_seqid;
F
Fred Isaman 已提交
1153 1154

	spin_lock(&ino->i_lock);
1155 1156
	lo = nfsi->layout;
	current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
F
Fred Isaman 已提交
1157

1158 1159 1160 1161
	/* 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);
F
Fred Isaman 已提交
1162 1163 1164
	spin_unlock(&ino->i_lock);
}

1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
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;
}

1185 1186 1187 1188 1189 1190
/*
 * 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
1191
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1192
	   const struct pnfs_layout_range *l2)
1193
{
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	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;

1206
	/* read > read/write */
1207
	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1208 1209
}

1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
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)
1232
{
1233
	struct pnfs_layout_segment *lp, *tmp;
1234

1235 1236
	dprintk("%s:Begin\n", __func__);

1237 1238 1239 1240 1241 1242 1243 1244
	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))
1245
			continue;
1246
		list_add_tail(&lseg->pls_list, &lp->pls_list);
1247 1248 1249
		dprintk("%s: inserted lseg %p "
			"iomode %d offset %llu length %llu before "
			"lp %p iomode %d offset %llu length %llu\n",
1250 1251 1252 1253
			__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);
1254
		goto out;
1255
	}
1256 1257 1258 1259 1260 1261
	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:
1262
	pnfs_get_layout_hdr(lo);
1263 1264

	dprintk("%s:Return\n", __func__);
1265
}
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
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);
}
1284 1285

static struct pnfs_layout_hdr *
1286 1287 1288
alloc_init_layout_hdr(struct inode *ino,
		      struct nfs_open_context *ctx,
		      gfp_t gfp_flags)
1289 1290 1291
{
	struct pnfs_layout_hdr *lo;

1292
	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1293 1294
	if (!lo)
		return NULL;
1295
	atomic_set(&lo->plh_refcount, 1);
1296 1297
	INIT_LIST_HEAD(&lo->plh_layouts);
	INIT_LIST_HEAD(&lo->plh_segs);
1298
	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1299
	lo->plh_inode = ino;
1300
	lo->plh_lc_cred = get_rpccred(ctx->cred);
1301
	lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1302 1303 1304 1305
	return lo;
}

static struct pnfs_layout_hdr *
1306 1307 1308
pnfs_find_alloc_layout(struct inode *ino,
		       struct nfs_open_context *ctx,
		       gfp_t gfp_flags)
1309 1310
	__releases(&ino->i_lock)
	__acquires(&ino->i_lock)
1311 1312 1313 1314 1315 1316
{
	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);

1317 1318
	if (nfsi->layout != NULL)
		goto out_existing;
1319
	spin_unlock(&ino->i_lock);
1320
	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1321 1322
	spin_lock(&ino->i_lock);

1323
	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1324
		nfsi->layout = new;
1325
		return new;
1326 1327
	} else if (new != NULL)
		pnfs_free_layout_hdr(new);
1328 1329
out_existing:
	pnfs_get_layout_hdr(nfsi->layout);
1330 1331 1332
	return nfsi->layout;
}

1333 1334
/*
 * iomode matching rules:
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
 * iomode	lseg	strict match
 *                      iomode
 * -----	-----	------ -----
 * ANY		READ	N/A    true
 * ANY		RW	N/A    true
 * RW		READ	N/A    false
 * RW		RW	N/A    true
 * READ		READ	N/A    true
 * READ		RW	true   false
 * READ		RW	false  true
1345
 */
1346
static bool
1347
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1348 1349
		 const struct pnfs_layout_range *range,
		 bool strict_iomode)
1350
{
1351 1352 1353 1354
	struct pnfs_layout_range range1;

	if ((range->iomode == IOMODE_RW &&
	     ls_range->iomode != IOMODE_RW) ||
1355 1356
	    (range->iomode != ls_range->iomode &&
	     strict_iomode == true) ||
1357
	    !pnfs_lseg_range_intersecting(ls_range, range))
1358 1359 1360 1361 1362
		return 0;

	/* range1 covers only the first byte in the range */
	range1 = *range;
	range1.length = 1;
1363
	return pnfs_lseg_range_contained(ls_range, &range1);
1364 1365 1366 1367 1368
}

/*
 * lookup range in layout
 */
1369
static struct pnfs_layout_segment *
1370
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1371 1372
		struct pnfs_layout_range *range,
		bool strict_iomode)
1373
{
1374 1375 1376 1377
	struct pnfs_layout_segment *lseg, *ret = NULL;

	dprintk("%s:Begin\n", __func__);

1378
	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1379
		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1380
		    !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1381 1382
		    pnfs_lseg_range_match(&lseg->pls_range, range,
					  strict_iomode)) {
1383
			ret = pnfs_get_lseg(lseg);
1384 1385 1386 1387 1388
			break;
		}
	}

	dprintk("%s:Return lseg %p ref %d\n",
1389
		__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1390
	return ret;
1391 1392
}

1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
/*
 * 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;
}

1468 1469 1470 1471 1472 1473 1474 1475
static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
{
	/*
	 * 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,
1476
				   nfs_wait_bit_killable,
1477 1478 1479
				   TASK_UNINTERRUPTIBLE);
}

1480 1481 1482 1483 1484 1485 1486 1487 1488
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);
}

1489 1490 1491 1492
/*
 * Layout segment is retreived from the server if not cached.
 * The appropriate layout segment is referenced and returned to the caller.
 */
1493
struct pnfs_layout_segment *
1494 1495
pnfs_update_layout(struct inode *ino,
		   struct nfs_open_context *ctx,
1496 1497
		   loff_t pos,
		   u64 count,
1498
		   enum pnfs_iomode iomode,
1499
		   bool strict_iomode,
1500
		   gfp_t gfp_flags)
1501
{
1502 1503 1504 1505 1506
	struct pnfs_layout_range arg = {
		.iomode = iomode,
		.offset = pos,
		.length = count,
	};
1507
	unsigned pg_offset, seq;
1508 1509
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs_client *clp = server->nfs_client;
1510
	struct pnfs_layout_hdr *lo = NULL;
1511
	struct pnfs_layout_segment *lseg = NULL;
1512 1513 1514
	nfs4_stateid stateid;
	long timeout = 0;
	unsigned long giveup = jiffies + rpc_get_timeout(server->client);
1515
	bool first;
1516

1517
	if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1518
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1519
				 PNFS_UPDATE_LAYOUT_NO_PNFS);
1520
		goto out;
1521
	}
1522

1523
	if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1524
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1525
				 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1526
		goto out;
1527
	}
1528

1529
	if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1530
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1531
				 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1532
		goto out;
1533
	}
1534

1535 1536
lookup_again:
	first = false;
1537
	spin_lock(&ino->i_lock);
1538
	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1539 1540
	if (lo == NULL) {
		spin_unlock(&ino->i_lock);
1541
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1542
				 PNFS_UPDATE_LAYOUT_NOMEM);
1543 1544
		goto out;
	}
1545

F
Fred Isaman 已提交
1546
	/* Do we even need to bother with this? */
1547
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1548
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1549
				 PNFS_UPDATE_LAYOUT_BULK_RECALL);
F
Fred Isaman 已提交
1550
		dprintk("%s matches recall, use MDS\n", __func__);
1551 1552 1553 1554
		goto out_unlock;
	}

	/* if LAYOUTGET already failed once we don't try again */
1555
	if (pnfs_layout_io_test_failed(lo, iomode)) {
1556
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1557
				 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1558
		goto out_unlock;
1559
	}
1560

1561
	lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
	if (lseg) {
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
				PNFS_UPDATE_LAYOUT_FOUND_CACHED);
		goto out_unlock;
	}

	if (!nfs4_valid_open_stateid(ctx->state)) {
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
				PNFS_UPDATE_LAYOUT_INVALID_OPEN);
		goto out_unlock;
	}

	/*
	 * Choose a stateid for the LAYOUTGET. If we don't have a layout
	 * stateid, or it has been invalidated, then we must use the open
	 * stateid.
	 */
1579
	if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1580 1581 1582

		/*
		 * The first layoutget for the file. Need to serialize per
1583 1584 1585 1586 1587 1588 1589 1590
		 * 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);
1591
			dprintk("%s retrying\n", __func__);
1592 1593
			goto lookup_again;
		}
1594 1595 1596 1597 1598 1599

		first = true;
		do {
			seq = read_seqbegin(&ctx->state->seqlock);
			nfs4_stateid_copy(&stateid, &ctx->state->stateid);
		} while (read_seqretry(&ctx->state->seqlock, seq));
1600
	} else {
1601
		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1602
	}
1603

1604 1605 1606 1607
	/*
	 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
	 * for LAYOUTRETURN even if first is true.
	 */
1608
	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1609 1610 1611
		spin_unlock(&ino->i_lock);
		dprintk("%s wait for layoutreturn\n", __func__);
		if (pnfs_prepare_to_retry_layoutget(lo)) {
1612 1613
			if (first)
				pnfs_clear_first_layoutget(lo);
1614 1615
			pnfs_put_layout_hdr(lo);
			dprintk("%s retrying\n", __func__);
1616 1617
			trace_pnfs_update_layout(ino, pos, count, iomode, lo,
					lseg, PNFS_UPDATE_LAYOUT_RETRY);
1618 1619
			goto lookup_again;
		}
1620
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1621
				PNFS_UPDATE_LAYOUT_RETURN);
1622 1623 1624
		goto out_put_layout_hdr;
	}

1625
	if (pnfs_layoutgets_blocked(lo)) {
1626
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1627
				PNFS_UPDATE_LAYOUT_BLOCKED);
1628
		goto out_unlock;
1629
	}
1630
	atomic_inc(&lo->plh_outstanding);
1631
	spin_unlock(&ino->i_lock);
1632

1633
	if (list_empty(&lo->plh_layouts)) {
1634 1635 1636 1637
		/* 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);
1638 1639
		if (list_empty(&lo->plh_layouts))
			list_add_tail(&lo->plh_layouts, &server->layouts);
1640 1641
		spin_unlock(&clp->cl_lock);
	}
1642

1643
	pg_offset = arg.offset & ~PAGE_MASK;
1644 1645 1646 1647
	if (pg_offset) {
		arg.offset -= pg_offset;
		arg.length += pg_offset;
	}
1648
	if (arg.length != NFS4_MAX_UINT64)
1649
		arg.length = PAGE_ALIGN(arg.length);
1650

1651 1652 1653
	lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
	trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
				 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1654
	if (IS_ERR(lseg)) {
1655 1656 1657 1658 1659 1660 1661
		switch(PTR_ERR(lseg)) {
		case -ERECALLCONFLICT:
			if (time_after(jiffies, giveup))
				lseg = NULL;
			/* Fallthrough */
		case -EAGAIN:
			pnfs_put_layout_hdr(lo);
1662 1663
			if (first)
				pnfs_clear_first_layoutget(lo);
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
			if (lseg) {
				trace_pnfs_update_layout(ino, pos, count,
					iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
				goto lookup_again;
			}
			/* Fallthrough */
		default:
			if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
				pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
				lseg = NULL;
			}
1675 1676 1677 1678 1679
		}
	} else {
		pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
	}

1680
	atomic_dec(&lo->plh_outstanding);
1681
out_put_layout_hdr:
1682 1683
	if (first)
		pnfs_clear_first_layoutget(lo);
1684
	pnfs_put_layout_hdr(lo);
1685
out:
1686 1687 1688 1689
	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),
1690
			IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1691 1692 1693
			iomode==IOMODE_RW ?  "read/write" : "read-only",
			(unsigned long long)pos,
			(unsigned long long)count);
1694 1695 1696
	return lseg;
out_unlock:
	spin_unlock(&ino->i_lock);
1697
	goto out_put_layout_hdr;
1698
}
1699
EXPORT_SYMBOL_GPL(pnfs_update_layout);
1700

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
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;
}

1721
struct pnfs_layout_segment *
1722 1723 1724 1725 1726
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;
1727
	struct inode *ino = lo->plh_inode;
1728
	LIST_HEAD(free_me);
1729 1730

	if (!pnfs_sanity_check_layout_range(&res->range))
1731
		return ERR_PTR(-EINVAL);
1732 1733

	/* Inject layout blob into I/O device driver */
1734
	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1735
	if (IS_ERR_OR_NULL(lseg)) {
1736
		if (!lseg)
1737 1738 1739 1740 1741
			lseg = ERR_PTR(-ENOMEM);

		dprintk("%s: Could not allocate layout: error %ld\n",
		       __func__, PTR_ERR(lseg));
		return lseg;
1742 1743
	}

1744 1745
	init_lseg(lo, lseg);
	lseg->pls_range = res->range;
1746
	lseg->pls_seq = be32_to_cpu(res->stateid.seqid);
1747

1748
	spin_lock(&ino->i_lock);
1749
	if (pnfs_layoutgets_blocked(lo)) {
F
Fred Isaman 已提交
1750
		dprintk("%s forget reply due to state\n", __func__);
1751
		goto out_forget;
F
Fred Isaman 已提交
1752
	}
1753

1754 1755 1756 1757
	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__);
1758
			goto out_forget;
1759 1760 1761 1762 1763 1764 1765 1766
		}
		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.
		 */
1767
		pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL, 0);
1768 1769 1770 1771

		nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
		lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
	}
1772

1773
	pnfs_get_lseg(lseg);
1774
	pnfs_layout_insert_lseg(lo, lseg, &free_me);
1775 1776 1777 1778 1779
	if (!pnfs_layout_is_valid(lo)) {
		pnfs_clear_layoutreturn_info(lo);
		clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
	}

1780

P
Peng Tao 已提交
1781
	if (res->return_on_close)
F
Fred Isaman 已提交
1782 1783
		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);

1784
	spin_unlock(&ino->i_lock);
1785
	pnfs_free_lseg_list(&free_me);
1786
	return lseg;
F
Fred Isaman 已提交
1787

1788
out_forget:
F
Fred Isaman 已提交
1789 1790 1791
	spin_unlock(&ino->i_lock);
	lseg->pls_layout = lo;
	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1792
	return ERR_PTR(-EAGAIN);
1793 1794
}

1795
static void
1796 1797
pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
			 u32 seq)
1798 1799 1800 1801 1802 1803
{
	if (lo->plh_return_iomode == iomode)
		return;
	if (lo->plh_return_iomode != 0)
		iomode = IOMODE_ANY;
	lo->plh_return_iomode = iomode;
1804
	set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
1805 1806
	if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
		lo->plh_return_seq = seq;
1807 1808
}

1809 1810 1811 1812 1813 1814 1815 1816 1817 1818
/**
 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
 * @lo: pointer to layout header
 * @tmp_list: list header to be used with pnfs_free_lseg_list()
 * @return_range: describe layout segment ranges to be returned
 *
 * This function is mainly intended for use by layoutrecall. It attempts
 * to free the layout segment immediately, or else to mark it for return
 * as soon as its reference count drops to zero.
 */
1819
int
1820 1821
pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
				struct list_head *tmp_list,
1822 1823
				const struct pnfs_layout_range *return_range,
				u32 seq)
1824 1825
{
	struct pnfs_layout_segment *lseg, *next;
1826
	int remaining = 0;
1827 1828 1829 1830

	dprintk("%s:Begin lo %p\n", __func__, lo);

	if (list_empty(&lo->plh_segs))
1831
		return 0;
1832

1833
	assert_spin_locked(&lo->plh_inode->i_lock);
1834 1835 1836 1837 1838 1839 1840 1841

	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);
1842 1843 1844
			if (mark_lseg_invalid(lseg, tmp_list))
				continue;
			remaining++;
1845 1846
			set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
		}
1847 1848 1849 1850

	if (remaining)
		pnfs_set_plh_return_info(lo, return_range->iomode, seq);

1851
	return remaining;
1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863
}

void pnfs_error_mark_layout_for_return(struct inode *inode,
				       struct pnfs_layout_segment *lseg)
{
	struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
	struct pnfs_layout_range range = {
		.iomode = lseg->pls_range.iomode,
		.offset = 0,
		.length = NFS4_MAX_UINT64,
	};
	LIST_HEAD(free_me);
1864
	bool return_now = false;
1865 1866

	spin_lock(&inode->i_lock);
1867
	pnfs_set_plh_return_info(lo, range.iomode, lseg->pls_seq);
1868 1869 1870 1871 1872
	/*
	 * 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.
	 */
1873 1874
	if (!pnfs_mark_matching_lsegs_return(lo, &free_me,
						&range, lseg->pls_seq)) {
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886
		nfs4_stateid stateid;
		enum pnfs_iomode iomode = lo->plh_return_iomode;

		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
		return_now = pnfs_prepare_layoutreturn(lo);
		spin_unlock(&inode->i_lock);
		if (return_now)
			pnfs_send_layoutreturn(lo, &stateid, iomode, false);
	} else {
		spin_unlock(&inode->i_lock);
		nfs_commit_inode(inode, 0);
	}
1887 1888 1889 1890
	pnfs_free_lseg_list(&free_me);
}
EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);

1891 1892 1893
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
P
Peng Tao 已提交
1894 1895
	u64 rd_size = req->wb_bytes;

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	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,
1907
						   false,
1908
						   GFP_KERNEL);
1909 1910 1911 1912 1913
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
1914
	}
1915 1916
	/* If no lseg, fall back to read through mds */
	if (pgio->pg_lseg == NULL)
1917
		nfs_pageio_reset_read_mds(pgio);
1918

1919 1920 1921 1922
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);

void
1923 1924
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
			   struct nfs_page *req, u64 wb_size)
1925
{
1926
	if (pgio->pg_lseg == NULL) {
1927 1928 1929 1930 1931
		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
						   req->wb_context,
						   req_offset(req),
						   wb_size,
						   IOMODE_RW,
1932
						   false,
1933
						   GFP_NOFS);
1934 1935 1936 1937 1938 1939
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
	}
1940 1941
	/* If no lseg, fall back to write through mds */
	if (pgio->pg_lseg == NULL)
1942
		nfs_pageio_reset_write_mds(pgio);
1943 1944 1945
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);

1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
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);

1956 1957 1958 1959 1960
/*
 * 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
1961 1962
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
		     struct nfs_page *prev, struct nfs_page *req)
1963
{
1964
	unsigned int size;
1965
	u64 seg_end, req_start, seg_left;
1966 1967 1968 1969

	size = nfs_generic_pg_test(pgio, prev, req);
	if (!size)
		return 0;
1970

1971
	/*
1972 1973 1974 1975 1976
	 * '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.
1977 1978 1979 1980 1981
	 *
	 * Please also note that 'end_offset' is actually the offset of the
	 * first byte that lies outside the pnfs_layout_range. FIXME?
	 *
	 */
1982
	if (pgio->pg_lseg) {
1983 1984 1985
		seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
				     pgio->pg_lseg->pls_range.length);
		req_start = req_offset(req);
1986
		WARN_ON_ONCE(req_start >= seg_end);
1987
		/* start of request is past the last byte of this segment */
1988 1989 1990 1991 1992 1993
		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);
1994
			return 0;
1995
		}
1996 1997 1998 1999 2000 2001

		/* 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;
2002
	}
2003

2004
	return size;
2005
}
2006
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2007

2008
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2009 2010 2011 2012
{
	struct nfs_pageio_descriptor pgio;

	/* Resend all requests through the MDS */
2013 2014
	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
			      hdr->completion_ops);
2015
	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2016
	return nfs_pageio_resend(&pgio, hdr);
2017
}
2018
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2019

2020
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2021
{
2022 2023 2024

	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2025
	    PNFS_LAYOUTRET_ON_ERROR) {
2026
		pnfs_return_layout(hdr->inode);
2027
	}
2028
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2029
		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2030 2031
}

2032 2033 2034
/*
 * Called by non rpc-based layout drivers
 */
2035
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2036
{
2037
	if (likely(!hdr->pnfs_error)) {
2038 2039
		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
				hdr->mds_offset + hdr->res.count);
2040
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2041 2042 2043
	}
	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
2044 2045
		pnfs_ld_handle_write_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2046
}
2047
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2048

2049 2050
static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2051
		struct nfs_pgio_header *hdr)
2052
{
2053
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2054

2055
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2056
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2057
		nfs_pageio_reset_write_mds(desc);
2058
		mirror->pg_recoalesce = 1;
2059
	}
2060
	nfs_pgio_data_destroy(hdr);
2061
	hdr->release(hdr);
2062 2063 2064
}

static enum pnfs_try_status
2065
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2066 2067 2068
			const struct rpc_call_ops *call_ops,
			struct pnfs_layout_segment *lseg,
			int how)
2069
{
2070
	struct inode *inode = hdr->inode;
2071 2072 2073
	enum pnfs_try_status trypnfs;
	struct nfs_server *nfss = NFS_SERVER(inode);

2074
	hdr->mds_ops = call_ops;
2075 2076

	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2077 2078
		inode->i_ino, hdr->args.count, hdr->args.offset, how);
	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2079
	if (trypnfs != PNFS_NOT_ATTEMPTED)
2080 2081 2082 2083 2084
		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}

2085
static void
2086 2087
pnfs_do_write(struct nfs_pageio_descriptor *desc,
	      struct nfs_pgio_header *hdr, int how)
2088 2089 2090
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2091
	enum pnfs_try_status trypnfs;
2092

2093
	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2094
	if (trypnfs == PNFS_NOT_ATTEMPTED)
2095
		pnfs_write_through_mds(desc, hdr);
2096 2097
}

2098 2099
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
{
2100
	pnfs_put_lseg(hdr->lseg);
2101
	nfs_pgio_header_free(hdr);
2102 2103
}

2104 2105 2106
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
2107
	struct nfs_pgio_header *hdr;
2108 2109
	int ret;

2110 2111
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2112 2113
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2114
	}
2115
	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2116

2117
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2118
	ret = nfs_generic_pgio(desc, hdr);
2119
	if (!ret)
2120
		pnfs_do_write(desc, hdr, desc->pg_ioflags);
2121

2122
	return ret;
2123 2124 2125
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);

2126
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2127 2128 2129
{
	struct nfs_pageio_descriptor pgio;

2130
	/* Resend all requests through the MDS */
2131 2132
	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
	return nfs_pageio_resend(&pgio, hdr);
2133
}
2134
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2135

2136
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2137
{
2138 2139
	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2140
	    PNFS_LAYOUTRET_ON_ERROR) {
2141
		pnfs_return_layout(hdr->inode);
2142
	}
2143
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2144
		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2145 2146
}

2147 2148 2149
/*
 * Called by non rpc-based layout drivers
 */
2150
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2151
{
2152
	if (likely(!hdr->pnfs_error)) {
2153 2154
		__nfs4_read_done_cb(hdr);
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2155 2156 2157
	}
	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
2158 2159
		pnfs_ld_handle_read_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2160 2161 2162
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);

2163 2164
static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2165
		struct nfs_pgio_header *hdr)
2166
{
2167
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2168

2169
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2170
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2171
		nfs_pageio_reset_read_mds(desc);
2172
		mirror->pg_recoalesce = 1;
2173
	}
2174
	nfs_pgio_data_destroy(hdr);
2175
	hdr->release(hdr);
2176 2177
}

A
Andy Adamson 已提交
2178 2179 2180
/*
 * Call the appropriate parallel I/O subsystem read function.
 */
2181
static enum pnfs_try_status
2182
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2183 2184
		       const struct rpc_call_ops *call_ops,
		       struct pnfs_layout_segment *lseg)
A
Andy Adamson 已提交
2185
{
2186
	struct inode *inode = hdr->inode;
A
Andy Adamson 已提交
2187 2188 2189
	struct nfs_server *nfss = NFS_SERVER(inode);
	enum pnfs_try_status trypnfs;

2190
	hdr->mds_ops = call_ops;
A
Andy Adamson 已提交
2191 2192

	dprintk("%s: Reading ino:%lu %u@%llu\n",
2193
		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
A
Andy Adamson 已提交
2194

2195
	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2196
	if (trypnfs != PNFS_NOT_ATTEMPTED)
A
Andy Adamson 已提交
2197 2198 2199 2200
		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}
A
Andy Adamson 已提交
2201

2202
/* Resend all requests through pnfs. */
2203
void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2204 2205 2206
{
	struct nfs_pageio_descriptor pgio;

2207 2208 2209 2210 2211
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
		nfs_pageio_init_read(&pgio, hdr->inode, false,
					hdr->completion_ops);
		hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
	}
2212 2213 2214
}
EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);

2215
static void
2216
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2217 2218 2219
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2220
	enum pnfs_try_status trypnfs;
2221

2222
	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2223
	if (trypnfs == PNFS_TRY_AGAIN)
2224 2225
		pnfs_read_resend_pnfs(hdr);
	if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
2226
		pnfs_read_through_mds(desc, hdr);
2227 2228
}

2229 2230
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
{
2231
	pnfs_put_lseg(hdr->lseg);
2232
	nfs_pgio_header_free(hdr);
2233 2234
}

2235 2236 2237
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
2238
	struct nfs_pgio_header *hdr;
2239 2240
	int ret;

2241 2242
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2243 2244
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2245
	}
2246
	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2247
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2248
	ret = nfs_generic_pgio(desc, hdr);
2249
	if (!ret)
2250
		pnfs_do_read(desc, hdr);
2251
	return ret;
2252 2253 2254
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);

2255 2256 2257 2258 2259
static void pnfs_clear_layoutcommitting(struct inode *inode)
{
	unsigned long *bitlock = &NFS_I(inode)->flags;

	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2260
	smp_mb__after_atomic();
2261 2262 2263
	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
}

A
Andy Adamson 已提交
2264
/*
2265
 * There can be multiple RW segments.
A
Andy Adamson 已提交
2266
 */
2267
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
A
Andy Adamson 已提交
2268
{
2269
	struct pnfs_layout_segment *lseg;
A
Andy Adamson 已提交
2270

2271 2272
	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
		if (lseg->pls_range.iomode == IOMODE_RW &&
2273
		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2274 2275
			list_add(&lseg->pls_lc_list, listp);
	}
A
Andy Adamson 已提交
2276 2277
}

2278 2279 2280 2281 2282 2283 2284 2285 2286 2287
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);
	}

2288
	pnfs_clear_layoutcommitting(inode);
2289 2290
}

P
Peng Tao 已提交
2291 2292
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
{
2293
	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
P
Peng Tao 已提交
2294 2295 2296
}
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);

A
Andy Adamson 已提交
2297
void
2298 2299
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
		loff_t end_pos)
A
Andy Adamson 已提交
2300
{
2301
	struct nfs_inode *nfsi = NFS_I(inode);
2302
	bool mark_as_dirty = false;
A
Andy Adamson 已提交
2303

2304
	spin_lock(&inode->i_lock);
A
Andy Adamson 已提交
2305
	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2306
		nfsi->layout->plh_lwb = end_pos;
2307
		mark_as_dirty = true;
A
Andy Adamson 已提交
2308
		dprintk("%s: Set layoutcommit for inode %lu ",
2309
			__func__, inode->i_ino);
2310 2311
	} else if (end_pos > nfsi->layout->plh_lwb)
		nfsi->layout->plh_lwb = end_pos;
2312
	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2313
		/* references matched in nfs4_layoutcommit_release */
2314
		pnfs_get_lseg(lseg);
2315
	}
2316
	spin_unlock(&inode->i_lock);
2317
	dprintk("%s: lseg %p end_pos %llu\n",
2318
		__func__, lseg, nfsi->layout->plh_lwb);
2319 2320 2321 2322

	/* 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)
2323
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2324 2325 2326
}
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);

A
Andy Adamson 已提交
2327 2328 2329 2330 2331 2332
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);
2333
	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
A
Andy Adamson 已提交
2334 2335
}

2336 2337 2338 2339 2340 2341 2342 2343
/*
 * 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.
 */
A
Andy Adamson 已提交
2344
int
2345
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
A
Andy Adamson 已提交
2346
{
2347
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
A
Andy Adamson 已提交
2348 2349 2350
	struct nfs4_layoutcommit_data *data;
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t end_pos;
2351
	int status;
A
Andy Adamson 已提交
2352

2353
	if (!pnfs_layoutcommit_outstanding(inode))
2354 2355
		return 0;

2356
	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
P
Peng Tao 已提交
2357

2358
	status = -EAGAIN;
P
Peng Tao 已提交
2359
	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2360 2361
		if (!sync)
			goto out;
2362
		status = wait_on_bit_lock_action(&nfsi->flags,
2363 2364 2365
				NFS_INO_LAYOUTCOMMITTING,
				nfs_wait_bit_killable,
				TASK_KILLABLE);
P
Peng Tao 已提交
2366
		if (status)
2367
			goto out;
P
Peng Tao 已提交
2368 2369
	}

2370 2371 2372 2373 2374 2375 2376
	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;
2377
	spin_lock(&inode->i_lock);
2378 2379
	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
		goto out_unlock;
2380

2381
	INIT_LIST_HEAD(&data->lseg_list);
2382
	pnfs_list_write_lseg(inode, &data->lseg_list);
A
Andy Adamson 已提交
2383

2384
	end_pos = nfsi->layout->plh_lwb;
A
Andy Adamson 已提交
2385

2386
	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
A
Andy Adamson 已提交
2387 2388 2389
	spin_unlock(&inode->i_lock);

	data->args.inode = inode;
2390
	data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
A
Andy Adamson 已提交
2391 2392 2393 2394 2395 2396
	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);

2397 2398 2399
	if (ld->prepare_layoutcommit) {
		status = ld->prepare_layoutcommit(&data->args);
		if (status) {
2400
			put_rpccred(data->cred);
2401
			spin_lock(&inode->i_lock);
2402 2403
			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
			if (end_pos > nfsi->layout->plh_lwb)
2404
				nfsi->layout->plh_lwb = end_pos;
2405
			goto out_unlock;
2406 2407 2408 2409
		}
	}


A
Andy Adamson 已提交
2410 2411
	status = nfs4_proc_layoutcommit(data, sync);
out:
P
Peng Tao 已提交
2412 2413
	if (status)
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2414 2415
	dprintk("<-- %s status %d\n", __func__, status);
	return status;
2416 2417
out_unlock:
	spin_unlock(&inode->i_lock);
P
Peng Tao 已提交
2418
	kfree(data);
2419 2420
clear_layoutcommitting:
	pnfs_clear_layoutcommitting(inode);
P
Peng Tao 已提交
2421
	goto out;
A
Andy Adamson 已提交
2422
}
2423
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2424

2425 2426 2427 2428 2429 2430 2431
int
pnfs_generic_sync(struct inode *inode, bool datasync)
{
	return pnfs_layoutcommit_inode(inode, true);
}
EXPORT_SYMBOL_GPL(pnfs_generic_sync);

2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
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;
}
2443

2444
#if IS_ENABLED(CONFIG_NFS_V4_2)
2445
int
2446
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2447 2448 2449
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
	struct nfs_server *server = NFS_SERVER(inode);
2450
	struct nfs_inode *nfsi = NFS_I(inode);
2451 2452 2453 2454 2455 2456 2457
	struct nfs42_layoutstat_data *data;
	struct pnfs_layout_hdr *hdr;
	int status = 0;

	if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
		goto out;

2458 2459 2460
	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
		goto out;

2461 2462 2463
	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
		goto out;

2464 2465 2466
	spin_lock(&inode->i_lock);
	if (!NFS_I(inode)->layout) {
		spin_unlock(&inode->i_lock);
2467
		goto out_clear_layoutstats;
2468 2469 2470 2471 2472
	}
	hdr = NFS_I(inode)->layout;
	pnfs_get_layout_hdr(hdr);
	spin_unlock(&inode->i_lock);

2473
	data = kzalloc(sizeof(*data), gfp_flags);
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495
	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);
2496
out_clear_layoutstats:
2497 2498 2499
	smp_mb__before_atomic();
	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
	smp_mb__after_atomic();
2500 2501 2502
	goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2503
#endif
2504 2505 2506 2507

unsigned int layoutstats_timer;
module_param(layoutstats_timer, uint, 0644);
EXPORT_SYMBOL_GPL(layoutstats_timer);