pnfs.c 61.9 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 int
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
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		       enum pnfs_iomode iomode, bool sync);
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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;

	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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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);
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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))
		clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
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	rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
}

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/* Return true if layoutreturn is needed */
static bool
pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
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			struct pnfs_layout_segment *lseg)
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{
	struct pnfs_layout_segment *s;

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	if (!test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
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		return false;

	list_for_each_entry(s, &lo->plh_segs, pls_list)
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		if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
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			return false;

	return true;
}

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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;
}

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static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
		struct pnfs_layout_hdr *lo, struct inode *inode)
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{
	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;
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		bool send;
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		stateid = lo->plh_stateid;
		iomode = lo->plh_return_iomode;
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		send = pnfs_prepare_layoutreturn(lo);
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		spin_unlock(&inode->i_lock);
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		if (send) {
			/* Send an async layoutreturn so we dont deadlock */
			pnfs_send_layoutreturn(lo, stateid, iomode, false);
		}
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	} else
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		spin_unlock(&inode->i_lock);
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}

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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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	/* Handle the case where refcount != 1 */
	if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
		return;

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	lo = lseg->pls_layout;
	inode = lo->plh_inode;
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	/* Do we need a layoutreturn? */
	if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
		pnfs_layoutreturn_before_put_lseg(lseg, lo, 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;
}

/* Returns count of number of matching invalid lsegs remaining in list
 * after call.
 */
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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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			    struct pnfs_layout_range *recall_range)
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{
	struct pnfs_layout_segment *lseg, *next;
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	int invalid = 0, removed = 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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			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;
590 591
}

592
/* note free_me must contain lsegs from a single layout_hdr */
F
Fred Isaman 已提交
593
void
594
pnfs_free_lseg_list(struct list_head *free_me)
595
{
596
	struct pnfs_layout_segment *lseg, *tmp;
597 598 599 600

	if (list_empty(free_me))
		return;

601
	list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
602
		list_del(&lseg->pls_list);
603
		pnfs_free_lseg(lseg);
604 605 606
	}
}

607 608 609 610
void
pnfs_destroy_layout(struct nfs_inode *nfsi)
{
	struct pnfs_layout_hdr *lo;
611
	LIST_HEAD(tmp_list);
612 613 614 615

	spin_lock(&nfsi->vfs_inode.i_lock);
	lo = nfsi->layout;
	if (lo) {
616
		lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
617
		pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
618 619 620
		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);
621
		pnfs_clear_retry_layoutget(lo);
622 623 624 625 626
		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);
627
}
628
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
629

630 631 632
static bool
pnfs_layout_add_bulk_destroy_list(struct inode *inode,
		struct list_head *layout_list)
633 634
{
	struct pnfs_layout_hdr *lo;
635
	bool ret = false;
636

637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
	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;
694 695 696

		pnfs_layoutcommit_inode(inode, false);

697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
		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);
719

720
	spin_lock(&clp->cl_lock);
721
	rcu_read_lock();
722
restart:
723
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
724 725 726 727 728 729
		if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
			continue;
		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
				server,
				&layout_list) != 0)
			goto restart;
730 731
	}
	rcu_read_unlock();
732 733
	spin_unlock(&clp->cl_lock);

734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
	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;
754
	}
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
	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);
774 775
}

776 777 778 779 780 781
/*
 * 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)
{
782
	return (s32)(s1 - s2) > 0;
783 784
}

785
/* update lo->plh_stateid with new if is more recent */
F
Fred Isaman 已提交
786 787 788
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
			bool update_barrier)
789
{
790 791
	u32 oldseq, newseq, new_barrier;
	int empty = list_empty(&lo->plh_segs);
792

793 794
	oldseq = be32_to_cpu(lo->plh_stateid.seqid);
	newseq = be32_to_cpu(new->seqid);
795
	if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
796
		nfs4_stateid_copy(&lo->plh_stateid, new);
F
Fred Isaman 已提交
797
		if (update_barrier) {
798
			new_barrier = be32_to_cpu(new->seqid);
F
Fred Isaman 已提交
799 800
		} else {
			/* Because of wraparound, we want to keep the barrier
801
			 * "close" to the current seqids.
F
Fred Isaman 已提交
802
			 */
803
			new_barrier = newseq - atomic_read(&lo->plh_outstanding);
F
Fred Isaman 已提交
804
		}
805 806
		if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
			lo->plh_barrier = new_barrier;
F
Fred Isaman 已提交
807
	}
808 809
}

810
static bool
811 812
pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
		const nfs4_stateid *stateid)
F
Fred Isaman 已提交
813
{
814
	u32 seqid = be32_to_cpu(stateid->seqid);
815

816 817 818 819 820
	return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
}

/* lget is set to 1 if called from inside send_layoutget call chain */
static bool
821
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
822
{
F
Fred Isaman 已提交
823
	return lo->plh_block_lgets ||
824
		test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
825 826
}

827 828
int
pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
829
			      struct pnfs_layout_range *range,
830
			      struct nfs4_state *open_state)
831
{
832
	int status = 0;
833

834
	dprintk("--> %s\n", __func__);
835
	spin_lock(&lo->plh_inode->i_lock);
836
	if (pnfs_layoutgets_blocked(lo)) {
837
		status = -EAGAIN;
838 839
	} else if (!nfs4_valid_open_stateid(open_state)) {
		status = -EBADF;
840 841
	} else if (list_empty(&lo->plh_segs) ||
		   test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
842 843 844 845
		int seq;

		do {
			seq = read_seqbegin(&open_state->seqlock);
846
			nfs4_stateid_copy(dst, &open_state->stateid);
847 848
		} while (read_seqretry(&open_state->seqlock, seq));
	} else
849
		nfs4_stateid_copy(dst, &lo->plh_stateid);
850
	spin_unlock(&lo->plh_inode->i_lock);
851
	dprintk("<-- %s\n", __func__);
852
	return status;
853 854 855 856 857 858 859 860
}

/*
* Get layout from server.
*    for now, assume that whole file layouts are requested.
*    arg->offset: 0
*    arg->length: all ones
*/
861 862 863
static struct pnfs_layout_segment *
send_layoutget(struct pnfs_layout_hdr *lo,
	   struct nfs_open_context *ctx,
864
	   struct pnfs_layout_range *range,
865
	   gfp_t gfp_flags)
866
{
867
	struct inode *ino = lo->plh_inode;
868 869
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs4_layoutget *lgp;
870
	struct pnfs_layout_segment *lseg;
871 872

	dprintk("--> %s\n", __func__);
873

874
	lgp = kzalloc(sizeof(*lgp), gfp_flags);
875
	if (lgp == NULL)
876
		return NULL;
877

878 879 880
	lgp->args.minlength = PAGE_CACHE_SIZE;
	if (lgp->args.minlength > range->length)
		lgp->args.minlength = range->length;
881
	lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
882
	lgp->args.range = *range;
883 884 885
	lgp->args.type = server->pnfs_curr_ld->id;
	lgp->args.inode = ino;
	lgp->args.ctx = get_nfs_open_context(ctx);
886
	lgp->gfp_flags = gfp_flags;
887
	lgp->cred = lo->plh_lc_cred;
888 889 890 891

	/* Synchronously retrieve layout information from server and
	 * store in lseg.
	 */
892 893 894 895 896 897 898 899
	lseg = nfs4_proc_layoutget(lgp, gfp_flags);
	if (IS_ERR(lseg)) {
		switch (PTR_ERR(lseg)) {
		case -ENOMEM:
		case -ERESTARTSYS:
			break;
		default:
			/* remember that LAYOUTGET failed and suspend trying */
900
			pnfs_layout_io_set_failed(lo, range->iomode);
901 902
		}
		return NULL;
903 904 905
	} else
		pnfs_layout_clear_fail_bit(lo,
				pnfs_iomode_to_fail_bit(range->iomode));
906

907 908 909
	return lseg;
}

910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
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);
	}
}

925 926 927 928 929
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);
930
	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
931 932
}

933 934
static int
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
935
		       enum pnfs_iomode iomode, bool sync)
936 937 938 939 940
{
	struct inode *ino = lo->plh_inode;
	struct nfs4_layoutreturn *lrp;
	int status = 0;

941
	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
942 943 944
	if (unlikely(lrp == NULL)) {
		status = -ENOMEM;
		spin_lock(&ino->i_lock);
945
		pnfs_clear_layoutreturn_waitbit(lo);
946 947 948 949 950 951 952 953
		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;
P
Peng Tao 已提交
954 955 956
	lrp->args.range.iomode = iomode;
	lrp->args.range.offset = 0;
	lrp->args.range.length = NFS4_MAX_UINT64;
957 958 959 960
	lrp->args.layout = lo;
	lrp->clp = NFS_SERVER(ino)->nfs_client;
	lrp->cred = lo->plh_lc_cred;

961
	status = nfs4_proc_layoutreturn(lrp, sync);
962 963 964 965 966
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}

967 968 969 970 971 972 973 974
/*
 * 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
975 976 977 978 979 980 981
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;
982
	int status = 0, empty;
983
	bool send;
B
Benny Halevy 已提交
984

985
	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
B
Benny Halevy 已提交
986 987 988

	spin_lock(&ino->i_lock);
	lo = nfsi->layout;
989
	if (!lo) {
B
Benny Halevy 已提交
990
		spin_unlock(&ino->i_lock);
991 992
		dprintk("NFS: %s no layout to return\n", __func__);
		goto out;
B
Benny Halevy 已提交
993 994 995
	}
	stateid = nfsi->layout->plh_stateid;
	/* Reference matched in nfs4_layoutreturn_release */
996
	pnfs_get_layout_hdr(lo);
997
	empty = list_empty(&lo->plh_segs);
998
	pnfs_clear_layoutcommit(ino, &tmp_list);
999
	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009

	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);
	}

1010 1011 1012 1013
	/* 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__);
1014
		goto out_put_layout_hdr;
1015
	}
1016 1017

	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1018
	send = pnfs_prepare_layoutreturn(lo);
B
Benny Halevy 已提交
1019 1020
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&tmp_list);
1021 1022 1023 1024
	if (send)
		status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
out_put_layout_hdr:
	pnfs_put_layout_hdr(lo);
B
Benny Halevy 已提交
1025 1026 1027 1028
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}
1029
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
B
Benny Halevy 已提交
1030

1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
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
1058 1059
bool pnfs_roc(struct inode *ino)
{
1060 1061 1062
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
F
Fred Isaman 已提交
1063 1064
	struct pnfs_layout_hdr *lo;
	struct pnfs_layout_segment *lseg, *tmp;
1065
	nfs4_stateid stateid;
F
Fred Isaman 已提交
1066
	LIST_HEAD(tmp_list);
1067
	bool found = false, layoutreturn = false, roc = false;
F
Fred Isaman 已提交
1068 1069

	spin_lock(&ino->i_lock);
1070
	lo = nfsi->layout;
P
Peng Tao 已提交
1071
	if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1072 1073
		goto out_noroc;

1074
	/* no roc if we hold a delegation */
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	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;
	}

1085 1086 1087 1088 1089 1090
	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);

1091
	pnfs_clear_retry_layoutget(lo);
F
Fred Isaman 已提交
1092
	list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1093 1094
		/* 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
1095 1096 1097
			mark_lseg_invalid(lseg, &tmp_list);
			found = true;
		}
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
	/* pnfs_prepare_layoutreturn() grabs lo ref and it will be put
	 * in pnfs_roc_release(). We don't really send a layoutreturn but
	 * still want others to view us like we are sending one!
	 *
	 * If pnfs_prepare_layoutreturn() fails, it means someone else is doing
	 * LAYOUTRETURN, so we proceed like there are no layouts to return.
	 *
	 * ROC in three conditions:
	 * 1. there are ROC lsegs
	 * 2. we don't send layoutreturn
	 * 3. no others are sending layoutreturn
	 */
	if (found && !layoutreturn && pnfs_prepare_layoutreturn(lo))
		roc = true;
F
Fred Isaman 已提交
1112

1113
out_noroc:
F
Fred Isaman 已提交
1114
	spin_unlock(&ino->i_lock);
1115 1116 1117
	pnfs_free_lseg_list(&tmp_list);
	pnfs_layoutcommit_inode(ino, true);
	if (layoutreturn)
1118
		pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1119
	return roc;
F
Fred Isaman 已提交
1120 1121 1122 1123 1124 1125 1126 1127
}

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

	spin_lock(&ino->i_lock);
	lo = NFS_I(ino)->layout;
1128
	pnfs_clear_layoutreturn_waitbit(lo);
1129 1130 1131 1132 1133 1134
	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
1135 1136 1137 1138 1139 1140 1141 1142
}

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;
1143
	if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
F
Fred Isaman 已提交
1144 1145
		lo->plh_barrier = barrier;
	spin_unlock(&ino->i_lock);
1146
	trace_nfs4_layoutreturn_on_close(ino, 0);
F
Fred Isaman 已提交
1147 1148
}

1149
void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
F
Fred Isaman 已提交
1150 1151
{
	struct nfs_inode *nfsi = NFS_I(ino);
1152 1153
	struct pnfs_layout_hdr *lo;
	u32 current_seqid;
F
Fred Isaman 已提交
1154 1155

	spin_lock(&ino->i_lock);
1156 1157
	lo = nfsi->layout;
	current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
F
Fred Isaman 已提交
1158

1159 1160 1161 1162
	/* 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
1163 1164 1165
	spin_unlock(&ino->i_lock);
}

1166 1167 1168 1169 1170 1171
/*
 * 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
1172
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1173
	   const struct pnfs_layout_range *l2)
1174
{
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
	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;

1187
	/* read > read/write */
1188
	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1189 1190
}

1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
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)
1213
{
1214
	struct pnfs_layout_segment *lp, *tmp;
1215

1216 1217
	dprintk("%s:Begin\n", __func__);

1218 1219 1220 1221 1222 1223 1224 1225
	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))
1226
			continue;
1227
		list_add_tail(&lseg->pls_list, &lp->pls_list);
1228 1229 1230
		dprintk("%s: inserted lseg %p "
			"iomode %d offset %llu length %llu before "
			"lp %p iomode %d offset %llu length %llu\n",
1231 1232 1233 1234
			__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);
1235
		goto out;
1236
	}
1237 1238 1239 1240 1241 1242
	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:
1243
	pnfs_get_layout_hdr(lo);
1244 1245

	dprintk("%s:Return\n", __func__);
1246
}
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
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);
}
1265 1266

static struct pnfs_layout_hdr *
1267 1268 1269
alloc_init_layout_hdr(struct inode *ino,
		      struct nfs_open_context *ctx,
		      gfp_t gfp_flags)
1270 1271 1272
{
	struct pnfs_layout_hdr *lo;

1273
	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1274 1275
	if (!lo)
		return NULL;
1276
	atomic_set(&lo->plh_refcount, 1);
1277 1278
	INIT_LIST_HEAD(&lo->plh_layouts);
	INIT_LIST_HEAD(&lo->plh_segs);
1279
	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1280
	lo->plh_inode = ino;
1281
	lo->plh_lc_cred = get_rpccred(ctx->cred);
1282 1283 1284 1285
	return lo;
}

static struct pnfs_layout_hdr *
1286 1287 1288
pnfs_find_alloc_layout(struct inode *ino,
		       struct nfs_open_context *ctx,
		       gfp_t gfp_flags)
1289 1290 1291 1292 1293 1294
{
	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);

1295 1296
	if (nfsi->layout != NULL)
		goto out_existing;
1297
	spin_unlock(&ino->i_lock);
1298
	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1299 1300
	spin_lock(&ino->i_lock);

1301
	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1302
		nfsi->layout = new;
1303
		return new;
1304 1305
	} else if (new != NULL)
		pnfs_free_layout_hdr(new);
1306 1307
out_existing:
	pnfs_get_layout_hdr(nfsi->layout);
1308 1309 1310
	return nfsi->layout;
}

1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
/*
 * iomode matching rules:
 * iomode	lseg	match
 * -----	-----	-----
 * ANY		READ	true
 * ANY		RW	true
 * RW		READ	false
 * RW		RW	true
 * READ		READ	true
 * READ		RW	true
 */
1322
static bool
1323
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1324
		 const struct pnfs_layout_range *range)
1325
{
1326 1327 1328 1329
	struct pnfs_layout_range range1;

	if ((range->iomode == IOMODE_RW &&
	     ls_range->iomode != IOMODE_RW) ||
1330
	    !pnfs_lseg_range_intersecting(ls_range, range))
1331 1332 1333 1334 1335
		return 0;

	/* range1 covers only the first byte in the range */
	range1 = *range;
	range1.length = 1;
1336
	return pnfs_lseg_range_contained(ls_range, &range1);
1337 1338 1339 1340 1341
}

/*
 * lookup range in layout
 */
1342
static struct pnfs_layout_segment *
1343 1344
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
		struct pnfs_layout_range *range)
1345
{
1346 1347 1348 1349
	struct pnfs_layout_segment *lseg, *ret = NULL;

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

1350
	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1351
		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1352
		    !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1353
		    pnfs_lseg_range_match(&lseg->pls_range, range)) {
1354
			ret = pnfs_get_lseg(lseg);
1355 1356 1357 1358 1359
			break;
		}
	}

	dprintk("%s:Return lseg %p ref %d\n",
1360
		__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1361
	return ret;
1362 1363
}

1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 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
/*
 * 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;
}

1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key)
{
	if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
		return 1;
	return nfs_wait_bit_killable(key);
}

static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
{
1449 1450
	if (!pnfs_should_retry_layoutget(lo))
		return false;
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
	/*
	 * 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);
}

1461 1462 1463 1464 1465 1466 1467 1468 1469
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);
}

1470 1471 1472 1473
/*
 * Layout segment is retreived from the server if not cached.
 * The appropriate layout segment is referenced and returned to the caller.
 */
1474
struct pnfs_layout_segment *
1475 1476
pnfs_update_layout(struct inode *ino,
		   struct nfs_open_context *ctx,
1477 1478
		   loff_t pos,
		   u64 count,
1479 1480
		   enum pnfs_iomode iomode,
		   gfp_t gfp_flags)
1481
{
1482 1483 1484 1485 1486
	struct pnfs_layout_range arg = {
		.iomode = iomode,
		.offset = pos,
		.length = count,
	};
1487
	unsigned pg_offset;
1488 1489
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs_client *clp = server->nfs_client;
1490 1491
	struct pnfs_layout_hdr *lo;
	struct pnfs_layout_segment *lseg = NULL;
1492
	bool first;
1493 1494

	if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1495
		goto out;
1496

1497 1498 1499
	if (iomode == IOMODE_READ && i_size_read(ino) == 0)
		goto out;

1500
	if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1501
		goto out;
1502

1503 1504
lookup_again:
	first = false;
1505
	spin_lock(&ino->i_lock);
1506
	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1507 1508 1509 1510
	if (lo == NULL) {
		spin_unlock(&ino->i_lock);
		goto out;
	}
1511

F
Fred Isaman 已提交
1512
	/* Do we even need to bother with this? */
1513
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
F
Fred Isaman 已提交
1514
		dprintk("%s matches recall, use MDS\n", __func__);
1515 1516 1517 1518
		goto out_unlock;
	}

	/* if LAYOUTGET already failed once we don't try again */
1519 1520
	if (pnfs_layout_io_test_failed(lo, iomode) &&
	    !pnfs_should_retry_layoutget(lo))
1521 1522
		goto out_unlock;

1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
	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)
			goto out_unlock;
	}
1544

1545 1546 1547 1548
	/*
	 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
	 * for LAYOUTRETURN even if first is true.
	 */
1549
	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1550 1551 1552
		spin_unlock(&ino->i_lock);
		dprintk("%s wait for layoutreturn\n", __func__);
		if (pnfs_prepare_to_retry_layoutget(lo)) {
1553 1554
			if (first)
				pnfs_clear_first_layoutget(lo);
1555 1556 1557 1558 1559 1560 1561
			pnfs_put_layout_hdr(lo);
			dprintk("%s retrying\n", __func__);
			goto lookup_again;
		}
		goto out_put_layout_hdr;
	}

1562
	if (pnfs_layoutgets_blocked(lo))
1563 1564
		goto out_unlock;
	atomic_inc(&lo->plh_outstanding);
1565
	spin_unlock(&ino->i_lock);
1566

1567
	if (list_empty(&lo->plh_layouts)) {
1568 1569 1570 1571
		/* 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);
1572 1573
		if (list_empty(&lo->plh_layouts))
			list_add_tail(&lo->plh_layouts, &server->layouts);
1574 1575
		spin_unlock(&clp->cl_lock);
	}
1576

1577 1578 1579 1580 1581
	pg_offset = arg.offset & ~PAGE_CACHE_MASK;
	if (pg_offset) {
		arg.offset -= pg_offset;
		arg.length += pg_offset;
	}
1582 1583
	if (arg.length != NFS4_MAX_UINT64)
		arg.length = PAGE_CACHE_ALIGN(arg.length);
1584

1585
	lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1586
	pnfs_clear_retry_layoutget(lo);
1587
	atomic_dec(&lo->plh_outstanding);
1588
out_put_layout_hdr:
1589 1590
	if (first)
		pnfs_clear_first_layoutget(lo);
1591
	pnfs_put_layout_hdr(lo);
1592
out:
1593 1594 1595 1596 1597 1598 1599 1600
	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);
1601 1602 1603
	return lseg;
out_unlock:
	spin_unlock(&ino->i_lock);
1604
	goto out_put_layout_hdr;
1605
}
1606
EXPORT_SYMBOL_GPL(pnfs_update_layout);
1607

1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
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;
}

1628
struct pnfs_layout_segment *
1629 1630 1631 1632 1633
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;
1634
	struct inode *ino = lo->plh_inode;
1635
	LIST_HEAD(free_me);
1636 1637 1638 1639
	int status = -EINVAL;

	if (!pnfs_sanity_check_layout_range(&res->range))
		goto out;
1640 1641

	/* Inject layout blob into I/O device driver */
1642
	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
	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;
	}

1653 1654 1655
	init_lseg(lo, lseg);
	lseg->pls_range = res->range;

1656
	spin_lock(&ino->i_lock);
1657
	if (pnfs_layoutgets_blocked(lo)) {
F
Fred Isaman 已提交
1658 1659 1660
		dprintk("%s forget reply due to state\n", __func__);
		goto out_forget_reply;
	}
1661

1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
	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__);
			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);
	}
1680

1681 1682
	clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);

1683
	pnfs_get_lseg(lseg);
1684
	pnfs_layout_insert_lseg(lo, lseg, &free_me);
1685

P
Peng Tao 已提交
1686
	if (res->return_on_close)
F
Fred Isaman 已提交
1687 1688
		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);

1689
	spin_unlock(&ino->i_lock);
1690
	pnfs_free_lseg_list(&free_me);
1691
	return lseg;
1692
out:
1693
	return ERR_PTR(status);
F
Fred Isaman 已提交
1694 1695 1696 1697 1698 1699

out_forget_reply:
	spin_unlock(&ino->i_lock);
	lseg->pls_layout = lo;
	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
	goto out;
1700 1701
}

1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722
static 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;

	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);
1723 1724
			set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
					&lo->plh_flags);
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
		}
}

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);

1758 1759 1760
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
P
Peng Tao 已提交
1761 1762
	u64 rd_size = req->wb_bytes;

1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	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);
	}
1776 1777
	/* If no lseg, fall back to read through mds */
	if (pgio->pg_lseg == NULL)
1778
		nfs_pageio_reset_read_mds(pgio);
1779

1780 1781 1782 1783
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);

void
1784 1785
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
			   struct nfs_page *req, u64 wb_size)
1786
{
1787 1788 1789 1790 1791 1792 1793
	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);
1794 1795
	/* If no lseg, fall back to write through mds */
	if (pgio->pg_lseg == NULL)
1796
		nfs_pageio_reset_write_mds(pgio);
1797 1798 1799
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);

1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
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);

1810 1811 1812 1813 1814
/*
 * 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
1815 1816
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
		     struct nfs_page *prev, struct nfs_page *req)
1817
{
1818
	unsigned int size;
1819
	u64 seg_end, req_start, seg_left;
1820 1821 1822 1823

	size = nfs_generic_pg_test(pgio, prev, req);
	if (!size)
		return 0;
1824

1825
	/*
1826 1827 1828 1829 1830
	 * '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.
1831 1832 1833 1834 1835
	 *
	 * Please also note that 'end_offset' is actually the offset of the
	 * first byte that lies outside the pnfs_layout_range. FIXME?
	 *
	 */
1836
	if (pgio->pg_lseg) {
1837 1838 1839
		seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
				     pgio->pg_lseg->pls_range.length);
		req_start = req_offset(req);
1840
		WARN_ON_ONCE(req_start >= seg_end);
1841
		/* start of request is past the last byte of this segment */
1842 1843 1844 1845 1846 1847
		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);
1848
			return 0;
1849
		}
1850 1851 1852 1853 1854 1855

		/* 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;
1856
	}
1857

1858
	return size;
1859
}
1860
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1861

1862
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1863 1864 1865 1866
{
	struct nfs_pageio_descriptor pgio;

	/* Resend all requests through the MDS */
1867 1868
	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
			      hdr->completion_ops);
1869
	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1870
	return nfs_pageio_resend(&pgio, hdr);
1871
}
1872
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1873

1874
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1875
{
1876 1877 1878

	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1879
	    PNFS_LAYOUTRET_ON_ERROR) {
1880
		pnfs_return_layout(hdr->inode);
1881
	}
1882
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1883
		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1884 1885
}

1886 1887 1888
/*
 * Called by non rpc-based layout drivers
 */
1889
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1890
{
1891
	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1892
	if (!hdr->pnfs_error) {
1893 1894
		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
				hdr->mds_offset + hdr->res.count);
1895
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1896
	} else
1897 1898
		pnfs_ld_handle_write_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
1899
}
1900
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1901

1902 1903
static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1904
		struct nfs_pgio_header *hdr)
1905
{
1906
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1907

1908
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1909
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1910
		nfs_pageio_reset_write_mds(desc);
1911
		mirror->pg_recoalesce = 1;
1912
	}
1913
	nfs_pgio_data_destroy(hdr);
1914
	hdr->release(hdr);
1915 1916 1917
}

static enum pnfs_try_status
1918
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
1919 1920 1921
			const struct rpc_call_ops *call_ops,
			struct pnfs_layout_segment *lseg,
			int how)
1922
{
1923
	struct inode *inode = hdr->inode;
1924 1925 1926
	enum pnfs_try_status trypnfs;
	struct nfs_server *nfss = NFS_SERVER(inode);

1927
	hdr->mds_ops = call_ops;
1928 1929

	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1930 1931
		inode->i_ino, hdr->args.count, hdr->args.offset, how);
	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
1932
	if (trypnfs != PNFS_NOT_ATTEMPTED)
1933 1934 1935 1936 1937
		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}

1938
static void
1939 1940
pnfs_do_write(struct nfs_pageio_descriptor *desc,
	      struct nfs_pgio_header *hdr, int how)
1941 1942 1943
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
1944
	enum pnfs_try_status trypnfs;
1945

1946
	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
1947
	if (trypnfs == PNFS_NOT_ATTEMPTED)
1948
		pnfs_write_through_mds(desc, hdr);
1949 1950
}

1951 1952
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
{
1953
	pnfs_put_lseg(hdr->lseg);
1954
	nfs_pgio_header_free(hdr);
1955 1956
}

1957 1958 1959
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
1960
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1961

1962
	struct nfs_pgio_header *hdr;
1963 1964
	int ret;

1965 1966
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
1967
		desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
1968
		return -ENOMEM;
1969
	}
1970
	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1971

1972
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1973
	ret = nfs_generic_pgio(desc, hdr);
1974
	if (!ret)
1975
		pnfs_do_write(desc, hdr, desc->pg_ioflags);
1976

1977
	return ret;
1978 1979 1980
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);

1981
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
1982 1983 1984
{
	struct nfs_pageio_descriptor pgio;

1985
	/* Resend all requests through the MDS */
1986 1987
	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
	return nfs_pageio_resend(&pgio, hdr);
1988
}
1989
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1990

1991
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
1992
{
1993 1994
	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1995
	    PNFS_LAYOUTRET_ON_ERROR) {
1996
		pnfs_return_layout(hdr->inode);
1997
	}
1998
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1999
		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2000 2001
}

2002 2003 2004
/*
 * Called by non rpc-based layout drivers
 */
2005
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2006
{
2007
	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2008
	if (likely(!hdr->pnfs_error)) {
2009 2010
		__nfs4_read_done_cb(hdr);
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2011
	} else
2012 2013
		pnfs_ld_handle_read_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2014 2015 2016
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);

2017 2018
static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2019
		struct nfs_pgio_header *hdr)
2020
{
2021
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2022

2023
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2024
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2025
		nfs_pageio_reset_read_mds(desc);
2026
		mirror->pg_recoalesce = 1;
2027
	}
2028
	nfs_pgio_data_destroy(hdr);
2029
	hdr->release(hdr);
2030 2031
}

A
Andy Adamson 已提交
2032 2033 2034
/*
 * Call the appropriate parallel I/O subsystem read function.
 */
2035
static enum pnfs_try_status
2036
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2037 2038
		       const struct rpc_call_ops *call_ops,
		       struct pnfs_layout_segment *lseg)
A
Andy Adamson 已提交
2039
{
2040
	struct inode *inode = hdr->inode;
A
Andy Adamson 已提交
2041 2042 2043
	struct nfs_server *nfss = NFS_SERVER(inode);
	enum pnfs_try_status trypnfs;

2044
	hdr->mds_ops = call_ops;
A
Andy Adamson 已提交
2045 2046

	dprintk("%s: Reading ino:%lu %u@%llu\n",
2047
		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
A
Andy Adamson 已提交
2048

2049
	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2050
	if (trypnfs != PNFS_NOT_ATTEMPTED)
A
Andy Adamson 已提交
2051 2052 2053 2054
		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}
A
Andy Adamson 已提交
2055

2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
/* 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);

2066
static void
2067
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2068 2069 2070
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2071
	enum pnfs_try_status trypnfs;
2072
	int err = 0;
2073

2074
	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2075 2076 2077
	if (trypnfs == PNFS_TRY_AGAIN)
		err = pnfs_read_resend_pnfs(hdr);
	if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2078
		pnfs_read_through_mds(desc, hdr);
2079 2080
}

2081 2082
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
{
2083
	pnfs_put_lseg(hdr->lseg);
2084
	nfs_pgio_header_free(hdr);
2085 2086
}

2087 2088 2089
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
2090
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2091

2092
	struct nfs_pgio_header *hdr;
2093 2094
	int ret;

2095 2096
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
2097
		desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
2098
		return -ENOMEM;
2099
	}
2100
	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2101
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2102
	ret = nfs_generic_pgio(desc, hdr);
2103
	if (!ret)
2104
		pnfs_do_read(desc, hdr);
2105
	return ret;
2106 2107 2108
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);

2109 2110 2111 2112 2113
static void pnfs_clear_layoutcommitting(struct inode *inode)
{
	unsigned long *bitlock = &NFS_I(inode)->flags;

	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2114
	smp_mb__after_atomic();
2115 2116 2117
	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
}

A
Andy Adamson 已提交
2118
/*
2119
 * There can be multiple RW segments.
A
Andy Adamson 已提交
2120
 */
2121
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
A
Andy Adamson 已提交
2122
{
2123
	struct pnfs_layout_segment *lseg;
A
Andy Adamson 已提交
2124

2125 2126
	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
		if (lseg->pls_range.iomode == IOMODE_RW &&
2127
		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2128 2129
			list_add(&lseg->pls_lc_list, listp);
	}
A
Andy Adamson 已提交
2130 2131
}

2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
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);
	}

2142
	pnfs_clear_layoutcommitting(inode);
2143 2144
}

P
Peng Tao 已提交
2145 2146
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
{
2147
	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
P
Peng Tao 已提交
2148 2149 2150
}
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);

A
Andy Adamson 已提交
2151
void
2152 2153
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
		loff_t end_pos)
A
Andy Adamson 已提交
2154
{
2155
	struct nfs_inode *nfsi = NFS_I(inode);
2156
	bool mark_as_dirty = false;
A
Andy Adamson 已提交
2157

2158
	spin_lock(&inode->i_lock);
A
Andy Adamson 已提交
2159
	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2160
		nfsi->layout->plh_lwb = end_pos;
2161
		mark_as_dirty = true;
A
Andy Adamson 已提交
2162
		dprintk("%s: Set layoutcommit for inode %lu ",
2163
			__func__, inode->i_ino);
2164 2165
	} else if (end_pos > nfsi->layout->plh_lwb)
		nfsi->layout->plh_lwb = end_pos;
2166
	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2167
		/* references matched in nfs4_layoutcommit_release */
2168
		pnfs_get_lseg(lseg);
2169
	}
2170
	spin_unlock(&inode->i_lock);
2171
	dprintk("%s: lseg %p end_pos %llu\n",
2172
		__func__, lseg, nfsi->layout->plh_lwb);
2173 2174 2175 2176

	/* 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)
2177
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2178 2179 2180
}
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);

A
Andy Adamson 已提交
2181 2182 2183 2184 2185 2186
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);
2187
	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
A
Andy Adamson 已提交
2188 2189
}

2190 2191 2192 2193 2194 2195 2196 2197
/*
 * 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
2198
int
2199
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
A
Andy Adamson 已提交
2200
{
2201
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
A
Andy Adamson 已提交
2202 2203 2204
	struct nfs4_layoutcommit_data *data;
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t end_pos;
2205
	int status;
A
Andy Adamson 已提交
2206

2207
	if (!pnfs_layoutcommit_outstanding(inode))
2208 2209
		return 0;

2210
	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
P
Peng Tao 已提交
2211

2212
	status = -EAGAIN;
P
Peng Tao 已提交
2213
	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2214 2215
		if (!sync)
			goto out;
2216
		status = wait_on_bit_lock_action(&nfsi->flags,
2217 2218 2219
				NFS_INO_LAYOUTCOMMITTING,
				nfs_wait_bit_killable,
				TASK_KILLABLE);
P
Peng Tao 已提交
2220
		if (status)
2221
			goto out;
P
Peng Tao 已提交
2222 2223
	}

2224 2225 2226 2227 2228 2229 2230
	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;
2231
	spin_lock(&inode->i_lock);
2232 2233
	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
		goto out_unlock;
2234

2235
	INIT_LIST_HEAD(&data->lseg_list);
2236
	pnfs_list_write_lseg(inode, &data->lseg_list);
A
Andy Adamson 已提交
2237

2238
	end_pos = nfsi->layout->plh_lwb;
A
Andy Adamson 已提交
2239

2240
	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
A
Andy Adamson 已提交
2241 2242 2243
	spin_unlock(&inode->i_lock);

	data->args.inode = inode;
2244
	data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
A
Andy Adamson 已提交
2245 2246 2247 2248 2249 2250
	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);

2251 2252 2253
	if (ld->prepare_layoutcommit) {
		status = ld->prepare_layoutcommit(&data->args);
		if (status) {
2254
			put_rpccred(data->cred);
2255
			spin_lock(&inode->i_lock);
2256 2257
			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
			if (end_pos > nfsi->layout->plh_lwb)
2258
				nfsi->layout->plh_lwb = end_pos;
2259
			goto out_unlock;
2260 2261 2262 2263
		}
	}


A
Andy Adamson 已提交
2264 2265
	status = nfs4_proc_layoutcommit(data, sync);
out:
P
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2266 2267
	if (status)
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2268 2269
	dprintk("<-- %s status %d\n", __func__, status);
	return status;
2270 2271
out_unlock:
	spin_unlock(&inode->i_lock);
P
Peng Tao 已提交
2272
	kfree(data);
2273 2274
clear_layoutcommitting:
	pnfs_clear_layoutcommitting(inode);
P
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2275
	goto out;
A
Andy Adamson 已提交
2276
}
2277
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2278

2279 2280 2281 2282 2283 2284 2285
int
pnfs_generic_sync(struct inode *inode, bool datasync)
{
	return pnfs_layoutcommit_inode(inode, true);
}
EXPORT_SYMBOL_GPL(pnfs_generic_sync);

2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
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;
}
2297

2298
#if IS_ENABLED(CONFIG_NFS_V4_2)
2299
int
2300
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2301 2302 2303
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
	struct nfs_server *server = NFS_SERVER(inode);
2304
	struct nfs_inode *nfsi = NFS_I(inode);
2305 2306 2307 2308 2309 2310 2311
	struct nfs42_layoutstat_data *data;
	struct pnfs_layout_hdr *hdr;
	int status = 0;

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

2312 2313 2314
	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
		goto out;

2315 2316 2317
	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
		goto out;

2318 2319 2320 2321 2322 2323 2324 2325 2326
	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);

2327
	data = kzalloc(sizeof(*data), gfp_flags);
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349
	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);
2350 2351 2352
	smp_mb__before_atomic();
	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
	smp_mb__after_atomic();
2353 2354 2355
	goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2356
#endif
2357 2358 2359 2360

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