pnfs.c 66.0 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))
		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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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
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pnfs_free_lseg_list(struct list_head *free_me)
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{
582
	struct pnfs_layout_segment *lseg, *tmp;
583 584 585 586

	if (list_empty(free_me))
		return;

587
	list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
588
		list_del(&lseg->pls_list);
589
		pnfs_free_lseg(lseg);
590 591 592
	}
}

593 594 595 596
void
pnfs_destroy_layout(struct nfs_inode *nfsi)
{
	struct pnfs_layout_hdr *lo;
597
	LIST_HEAD(tmp_list);
598 599 600 601

	spin_lock(&nfsi->vfs_inode.i_lock);
	lo = nfsi->layout;
	if (lo) {
602
		pnfs_get_layout_hdr(lo);
603
		pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
604 605 606 607 608 609 610
		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);
611
}
612
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
613

614 615 616
static bool
pnfs_layout_add_bulk_destroy_list(struct inode *inode,
		struct list_head *layout_list)
617 618
{
	struct pnfs_layout_hdr *lo;
619
	bool ret = false;
620

621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672
	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;
673 674 675

		pnfs_layoutcommit_inode(inode, false);

676 677
		spin_lock(&inode->i_lock);
		list_del_init(&lo->plh_bulk_destroy);
678 679 680
		if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
			if (is_bulk_recall)
				set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
681
			ret = -EAGAIN;
682
		}
683 684
		spin_unlock(&inode->i_lock);
		pnfs_free_lseg_list(&lseg_list);
685 686
		/* Free all lsegs that are attached to commit buckets */
		nfs_commit_inode(inode, 0);
687 688 689 690 691 692 693 694 695 696 697 698 699
		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);
700

701
	spin_lock(&clp->cl_lock);
702
	rcu_read_lock();
703
restart:
704
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
705 706 707 708 709 710
		if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
			continue;
		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
				server,
				&layout_list) != 0)
			goto restart;
711 712
	}
	rcu_read_unlock();
713 714
	spin_unlock(&clp->cl_lock);

715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
	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;
735
	}
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
	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);
755 756
}

757
/* update lo->plh_stateid with new if is more recent */
F
Fred Isaman 已提交
758 759 760
void
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
			bool update_barrier)
761
{
762 763
	u32 oldseq, newseq, new_barrier;
	int empty = list_empty(&lo->plh_segs);
764

765 766
	oldseq = be32_to_cpu(lo->plh_stateid.seqid);
	newseq = be32_to_cpu(new->seqid);
767
	if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
768
		nfs4_stateid_copy(&lo->plh_stateid, new);
F
Fred Isaman 已提交
769
		if (update_barrier) {
770
			new_barrier = be32_to_cpu(new->seqid);
F
Fred Isaman 已提交
771 772
		} else {
			/* Because of wraparound, we want to keep the barrier
773
			 * "close" to the current seqids.
F
Fred Isaman 已提交
774
			 */
775
			new_barrier = newseq - atomic_read(&lo->plh_outstanding);
F
Fred Isaman 已提交
776
		}
777 778
		if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
			lo->plh_barrier = new_barrier;
F
Fred Isaman 已提交
779
	}
780 781
}

782
static bool
783 784
pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
		const nfs4_stateid *stateid)
F
Fred Isaman 已提交
785
{
786
	u32 seqid = be32_to_cpu(stateid->seqid);
787

788 789 790 791 792
	return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
}

/* lget is set to 1 if called from inside send_layoutget call chain */
static bool
793
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
794
{
F
Fred Isaman 已提交
795
	return lo->plh_block_lgets ||
796
		test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
797 798
}

799
/*
800 801 802 803 804
 * Get layout from server.
 *    for now, assume that whole file layouts are requested.
 *    arg->offset: 0
 *    arg->length: all ones
 */
805 806 807
static struct pnfs_layout_segment *
send_layoutget(struct pnfs_layout_hdr *lo,
	   struct nfs_open_context *ctx,
808
	   nfs4_stateid *stateid,
809
	   const struct pnfs_layout_range *range,
810
	   long *timeout, gfp_t gfp_flags)
811
{
812
	struct inode *ino = lo->plh_inode;
813 814
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs4_layoutget *lgp;
815
	loff_t i_size;
816 817

	dprintk("--> %s\n", __func__);
818

819 820 821 822 823
	/*
	 * Synchronously retrieve layout information from server and
	 * store in lseg. If we race with a concurrent seqid morphing
	 * op, then re-send the LAYOUTGET.
	 */
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	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;
838
	}
839 840 841 842 843
	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);
844
	nfs4_stateid_copy(&lgp->args.stateid, stateid);
845 846
	lgp->gfp_flags = gfp_flags;
	lgp->cred = lo->plh_lc_cred;
847

848
	return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
849 850
}

851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
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);
	}
}

866 867 868 869 870
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);
871
	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
872 873
}

874 875 876 877 878 879
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;
880
	lo->plh_return_seq = 0;
881
	pnfs_get_layout_hdr(lo);
882
	clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
883 884 885
	return true;
}

886
static int
887
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
888
		       enum pnfs_iomode iomode, bool sync)
889 890 891 892 893
{
	struct inode *ino = lo->plh_inode;
	struct nfs4_layoutreturn *lrp;
	int status = 0;

894
	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
895 896 897
	if (unlikely(lrp == NULL)) {
		status = -ENOMEM;
		spin_lock(&ino->i_lock);
898
		pnfs_clear_layoutreturn_waitbit(lo);
899 900 901 902 903
		spin_unlock(&ino->i_lock);
		pnfs_put_layout_hdr(lo);
		goto out;
	}

904
	nfs4_stateid_copy(&lrp->args.stateid, stateid);
905 906
	lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
	lrp->args.inode = ino;
P
Peng Tao 已提交
907 908 909
	lrp->args.range.iomode = iomode;
	lrp->args.range.offset = 0;
	lrp->args.range.length = NFS4_MAX_UINT64;
910 911 912 913
	lrp->args.layout = lo;
	lrp->clp = NFS_SERVER(ino)->nfs_client;
	lrp->cred = lo->plh_lc_cred;

914
	status = nfs4_proc_layoutreturn(lrp, sync);
915 916 917 918 919
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}

920 921 922 923 924 925
/* Return true if layoutreturn is needed */
static bool
pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
{
	struct pnfs_layout_segment *s;

926
	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
		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;

942
	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
943 944 945 946 947 948 949 950
		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);
951
		stateid.seqid = cpu_to_be32(lo->plh_return_seq);
952 953 954 955 956 957 958 959 960 961 962
		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);
}

963 964 965 966 967 968 969 970
/*
 * 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
971 972 973 974 975 976 977
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;
978
	int status = 0, empty;
979
	bool send;
B
Benny Halevy 已提交
980

981
	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
B
Benny Halevy 已提交
982 983 984

	spin_lock(&ino->i_lock);
	lo = nfsi->layout;
985
	if (!lo) {
B
Benny Halevy 已提交
986
		spin_unlock(&ino->i_lock);
987 988
		dprintk("NFS: %s no layout to return\n", __func__);
		goto out;
B
Benny Halevy 已提交
989
	}
990
	nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid);
B
Benny Halevy 已提交
991
	/* Reference matched in nfs4_layoutreturn_release */
992
	pnfs_get_layout_hdr(lo);
993
	empty = list_empty(&lo->plh_segs);
994
	pnfs_clear_layoutcommit(ino, &tmp_list);
995
	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
996 997 998 999 1000 1001 1002 1003 1004 1005

	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);
	}

1006 1007 1008 1009
	/* 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__);
1010
		goto out_put_layout_hdr;
1011
	}
1012 1013

	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1014
	send = pnfs_prepare_layoutreturn(lo);
B
Benny Halevy 已提交
1015 1016
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&tmp_list);
1017
	if (send)
1018
		status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1019 1020
out_put_layout_hdr:
	pnfs_put_layout_hdr(lo);
B
Benny Halevy 已提交
1021 1022 1023 1024
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}
1025
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
B
Benny Halevy 已提交
1026

1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
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
1054 1055
bool pnfs_roc(struct inode *ino)
{
1056 1057 1058
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
F
Fred Isaman 已提交
1059 1060
	struct pnfs_layout_hdr *lo;
	struct pnfs_layout_segment *lseg, *tmp;
1061
	nfs4_stateid stateid;
F
Fred Isaman 已提交
1062
	LIST_HEAD(tmp_list);
1063
	bool found = false, layoutreturn = false, roc = false;
F
Fred Isaman 已提交
1064 1065

	spin_lock(&ino->i_lock);
1066
	lo = nfsi->layout;
P
Peng Tao 已提交
1067
	if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1068 1069
		goto out_noroc;

1070
	/* no roc if we hold a delegation */
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
	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;
	}

1081
	nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1082
	/* always send layoutreturn if being marked so */
1083
	if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED,
1084 1085 1086
				   &lo->plh_flags))
		layoutreturn = pnfs_prepare_layoutreturn(lo);

F
Fred Isaman 已提交
1087
	list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1088 1089
		/* 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
1090 1091 1092
			mark_lseg_invalid(lseg, &tmp_list);
			found = true;
		}
1093
	/* ROC in two conditions:
1094 1095 1096
	 * 1. there are ROC lsegs
	 * 2. we don't send layoutreturn
	 */
1097 1098 1099
	if (found && !layoutreturn) {
		/* lo ref dropped in pnfs_roc_release() */
		pnfs_get_layout_hdr(lo);
1100
		roc = true;
1101
	}
F
Fred Isaman 已提交
1102

1103
out_noroc:
F
Fred Isaman 已提交
1104
	spin_unlock(&ino->i_lock);
1105 1106 1107
	pnfs_free_lseg_list(&tmp_list);
	pnfs_layoutcommit_inode(ino, true);
	if (layoutreturn)
1108
		pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1109
	return roc;
F
Fred Isaman 已提交
1110 1111 1112 1113 1114 1115 1116 1117
}

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

	spin_lock(&ino->i_lock);
	lo = NFS_I(ino)->layout;
1118
	pnfs_clear_layoutreturn_waitbit(lo);
1119 1120 1121 1122 1123 1124
	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
1125 1126 1127 1128 1129 1130 1131 1132
}

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;
1133
	pnfs_mark_layout_returned_if_empty(lo);
1134
	if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
F
Fred Isaman 已提交
1135 1136
		lo->plh_barrier = barrier;
	spin_unlock(&ino->i_lock);
1137
	trace_nfs4_layoutreturn_on_close(ino, 0);
F
Fred Isaman 已提交
1138 1139
}

1140
void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
F
Fred Isaman 已提交
1141 1142
{
	struct nfs_inode *nfsi = NFS_I(ino);
1143 1144
	struct pnfs_layout_hdr *lo;
	u32 current_seqid;
F
Fred Isaman 已提交
1145 1146

	spin_lock(&ino->i_lock);
1147 1148
	lo = nfsi->layout;
	current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
F
Fred Isaman 已提交
1149

1150 1151 1152 1153
	/* 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
1154 1155 1156
	spin_unlock(&ino->i_lock);
}

1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
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;
}

1177 1178 1179 1180 1181 1182
/*
 * 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
1183
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1184
	   const struct pnfs_layout_range *l2)
1185
{
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
	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;

1198
	/* read > read/write */
1199
	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1200 1201
}

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
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)
1224
{
1225
	struct pnfs_layout_segment *lp, *tmp;
1226

1227 1228
	dprintk("%s:Begin\n", __func__);

1229 1230 1231 1232 1233 1234 1235 1236
	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))
1237
			continue;
1238
		list_add_tail(&lseg->pls_list, &lp->pls_list);
1239 1240 1241
		dprintk("%s: inserted lseg %p "
			"iomode %d offset %llu length %llu before "
			"lp %p iomode %d offset %llu length %llu\n",
1242 1243 1244 1245
			__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);
1246
		goto out;
1247
	}
1248 1249 1250 1251 1252 1253
	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:
1254
	pnfs_get_layout_hdr(lo);
1255 1256

	dprintk("%s:Return\n", __func__);
1257
}
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
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);
}
1276 1277

static struct pnfs_layout_hdr *
1278 1279 1280
alloc_init_layout_hdr(struct inode *ino,
		      struct nfs_open_context *ctx,
		      gfp_t gfp_flags)
1281 1282 1283
{
	struct pnfs_layout_hdr *lo;

1284
	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1285 1286
	if (!lo)
		return NULL;
1287
	atomic_set(&lo->plh_refcount, 1);
1288 1289
	INIT_LIST_HEAD(&lo->plh_layouts);
	INIT_LIST_HEAD(&lo->plh_segs);
1290
	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1291
	lo->plh_inode = ino;
1292
	lo->plh_lc_cred = get_rpccred(ctx->cred);
1293 1294 1295 1296
	return lo;
}

static struct pnfs_layout_hdr *
1297 1298 1299
pnfs_find_alloc_layout(struct inode *ino,
		       struct nfs_open_context *ctx,
		       gfp_t gfp_flags)
1300 1301 1302 1303 1304 1305
{
	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);

1306 1307
	if (nfsi->layout != NULL)
		goto out_existing;
1308
	spin_unlock(&ino->i_lock);
1309
	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1310 1311
	spin_lock(&ino->i_lock);

1312
	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1313
		nfsi->layout = new;
1314
		return new;
1315 1316
	} else if (new != NULL)
		pnfs_free_layout_hdr(new);
1317 1318
out_existing:
	pnfs_get_layout_hdr(nfsi->layout);
1319 1320 1321
	return nfsi->layout;
}

1322 1323
/*
 * iomode matching rules:
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
 * 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
1334
 */
1335
static bool
1336
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1337 1338
		 const struct pnfs_layout_range *range,
		 bool strict_iomode)
1339
{
1340 1341 1342 1343
	struct pnfs_layout_range range1;

	if ((range->iomode == IOMODE_RW &&
	     ls_range->iomode != IOMODE_RW) ||
1344 1345
	    (range->iomode != ls_range->iomode &&
	     strict_iomode == true) ||
1346
	    !pnfs_lseg_range_intersecting(ls_range, range))
1347 1348 1349 1350 1351
		return 0;

	/* range1 covers only the first byte in the range */
	range1 = *range;
	range1.length = 1;
1352
	return pnfs_lseg_range_contained(ls_range, &range1);
1353 1354 1355 1356 1357
}

/*
 * lookup range in layout
 */
1358
static struct pnfs_layout_segment *
1359
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1360 1361
		struct pnfs_layout_range *range,
		bool strict_iomode)
1362
{
1363 1364 1365 1366
	struct pnfs_layout_segment *lseg, *ret = NULL;

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

1367
	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1368
		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1369
		    !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1370 1371
		    pnfs_lseg_range_match(&lseg->pls_range, range,
					  strict_iomode)) {
1372
			ret = pnfs_get_lseg(lseg);
1373 1374 1375 1376 1377
			break;
		}
	}

	dprintk("%s:Return lseg %p ref %d\n",
1378
		__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1379
	return ret;
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 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456
/*
 * 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;
}

1457 1458 1459 1460 1461 1462 1463 1464
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,
1465
				   nfs_wait_bit_killable,
1466 1467 1468
				   TASK_UNINTERRUPTIBLE);
}

1469 1470 1471 1472 1473 1474 1475 1476 1477
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);
}

1478 1479 1480 1481
/*
 * Layout segment is retreived from the server if not cached.
 * The appropriate layout segment is referenced and returned to the caller.
 */
1482
struct pnfs_layout_segment *
1483 1484
pnfs_update_layout(struct inode *ino,
		   struct nfs_open_context *ctx,
1485 1486
		   loff_t pos,
		   u64 count,
1487
		   enum pnfs_iomode iomode,
1488
		   bool strict_iomode,
1489
		   gfp_t gfp_flags)
1490
{
1491 1492 1493 1494 1495
	struct pnfs_layout_range arg = {
		.iomode = iomode,
		.offset = pos,
		.length = count,
	};
1496
	unsigned pg_offset, seq;
1497 1498
	struct nfs_server *server = NFS_SERVER(ino);
	struct nfs_client *clp = server->nfs_client;
1499
	struct pnfs_layout_hdr *lo = NULL;
1500
	struct pnfs_layout_segment *lseg = NULL;
1501 1502 1503
	nfs4_stateid stateid;
	long timeout = 0;
	unsigned long giveup = jiffies + rpc_get_timeout(server->client);
1504
	bool first;
1505

1506
	if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1507
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1508
				 PNFS_UPDATE_LAYOUT_NO_PNFS);
1509
		goto out;
1510
	}
1511

1512
	if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1513
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1514
				 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1515
		goto out;
1516
	}
1517

1518
	if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1519
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1520
				 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1521
		goto out;
1522
	}
1523

1524 1525
lookup_again:
	first = false;
1526
	spin_lock(&ino->i_lock);
1527
	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1528 1529
	if (lo == NULL) {
		spin_unlock(&ino->i_lock);
1530
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1531
				 PNFS_UPDATE_LAYOUT_NOMEM);
1532 1533
		goto out;
	}
1534

F
Fred Isaman 已提交
1535
	/* Do we even need to bother with this? */
1536
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1537
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1538
				 PNFS_UPDATE_LAYOUT_BULK_RECALL);
F
Fred Isaman 已提交
1539
		dprintk("%s matches recall, use MDS\n", __func__);
1540 1541 1542 1543
		goto out_unlock;
	}

	/* if LAYOUTGET already failed once we don't try again */
1544
	if (pnfs_layout_io_test_failed(lo, iomode)) {
1545
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1546
				 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1547
		goto out_unlock;
1548
	}
1549

1550
	lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
	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.
	 */
	if (lo->plh_stateid.seqid == 0 ||
	    test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {

		/*
		 * The first layoutget for the file. Need to serialize per
1573 1574 1575 1576 1577 1578 1579 1580
		 * 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);
1581
			dprintk("%s retrying\n", __func__);
1582 1583
			goto lookup_again;
		}
1584 1585 1586 1587 1588 1589

		first = true;
		do {
			seq = read_seqbegin(&ctx->state->seqlock);
			nfs4_stateid_copy(&stateid, &ctx->state->stateid);
		} while (read_seqretry(&ctx->state->seqlock, seq));
1590
	} else {
1591
		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1592
	}
1593

1594 1595 1596 1597
	/*
	 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
	 * for LAYOUTRETURN even if first is true.
	 */
1598
	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1599 1600 1601
		spin_unlock(&ino->i_lock);
		dprintk("%s wait for layoutreturn\n", __func__);
		if (pnfs_prepare_to_retry_layoutget(lo)) {
1602 1603
			if (first)
				pnfs_clear_first_layoutget(lo);
1604 1605
			pnfs_put_layout_hdr(lo);
			dprintk("%s retrying\n", __func__);
1606 1607
			trace_pnfs_update_layout(ino, pos, count, iomode, lo,
					lseg, PNFS_UPDATE_LAYOUT_RETRY);
1608 1609
			goto lookup_again;
		}
1610
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1611
				PNFS_UPDATE_LAYOUT_RETURN);
1612 1613 1614
		goto out_put_layout_hdr;
	}

1615
	if (pnfs_layoutgets_blocked(lo)) {
1616
		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1617
				PNFS_UPDATE_LAYOUT_BLOCKED);
1618
		goto out_unlock;
1619
	}
1620
	atomic_inc(&lo->plh_outstanding);
1621
	spin_unlock(&ino->i_lock);
1622

1623
	if (list_empty(&lo->plh_layouts)) {
1624 1625 1626 1627
		/* 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);
1628 1629
		if (list_empty(&lo->plh_layouts))
			list_add_tail(&lo->plh_layouts, &server->layouts);
1630 1631
		spin_unlock(&clp->cl_lock);
	}
1632

1633
	pg_offset = arg.offset & ~PAGE_MASK;
1634 1635 1636 1637
	if (pg_offset) {
		arg.offset -= pg_offset;
		arg.length += pg_offset;
	}
1638
	if (arg.length != NFS4_MAX_UINT64)
1639
		arg.length = PAGE_ALIGN(arg.length);
1640

1641 1642 1643
	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);
1644
	if (IS_ERR(lseg)) {
1645 1646 1647 1648 1649 1650 1651
		switch(PTR_ERR(lseg)) {
		case -ERECALLCONFLICT:
			if (time_after(jiffies, giveup))
				lseg = NULL;
			/* Fallthrough */
		case -EAGAIN:
			pnfs_put_layout_hdr(lo);
1652 1653
			if (first)
				pnfs_clear_first_layoutget(lo);
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
			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;
			}
1665 1666 1667 1668 1669
		}
	} else {
		pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
	}

1670
	atomic_dec(&lo->plh_outstanding);
1671
out_put_layout_hdr:
1672 1673
	if (first)
		pnfs_clear_first_layoutget(lo);
1674
	pnfs_put_layout_hdr(lo);
1675
out:
1676 1677 1678 1679
	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),
1680
			IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1681 1682 1683
			iomode==IOMODE_RW ?  "read/write" : "read-only",
			(unsigned long long)pos,
			(unsigned long long)count);
1684 1685 1686
	return lseg;
out_unlock:
	spin_unlock(&ino->i_lock);
1687
	goto out_put_layout_hdr;
1688
}
1689
EXPORT_SYMBOL_GPL(pnfs_update_layout);
1690

1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
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;
}

1711
struct pnfs_layout_segment *
1712 1713 1714 1715 1716
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;
1717
	struct inode *ino = lo->plh_inode;
1718
	LIST_HEAD(free_me);
1719 1720

	if (!pnfs_sanity_check_layout_range(&res->range))
1721
		return ERR_PTR(-EINVAL);
1722 1723

	/* Inject layout blob into I/O device driver */
1724
	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1725
	if (IS_ERR_OR_NULL(lseg)) {
1726
		if (!lseg)
1727 1728 1729 1730 1731
			lseg = ERR_PTR(-ENOMEM);

		dprintk("%s: Could not allocate layout: error %ld\n",
		       __func__, PTR_ERR(lseg));
		return lseg;
1732 1733
	}

1734 1735
	init_lseg(lo, lseg);
	lseg->pls_range = res->range;
1736
	lseg->pls_seq = be32_to_cpu(res->stateid.seqid);
1737

1738
	spin_lock(&ino->i_lock);
1739
	if (pnfs_layoutgets_blocked(lo)) {
F
Fred Isaman 已提交
1740
		dprintk("%s forget reply due to state\n", __func__);
1741
		goto out_forget;
F
Fred Isaman 已提交
1742
	}
1743

1744 1745 1746 1747
	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__);
1748
			goto out_forget;
1749 1750 1751 1752 1753 1754 1755 1756
		}
		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.
		 */
1757
		pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL, 0);
1758 1759 1760 1761

		nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
		lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
	}
1762

1763 1764
	clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);

1765
	pnfs_get_lseg(lseg);
1766
	pnfs_layout_insert_lseg(lo, lseg, &free_me);
1767

P
Peng Tao 已提交
1768
	if (res->return_on_close)
F
Fred Isaman 已提交
1769 1770
		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);

1771
	spin_unlock(&ino->i_lock);
1772
	pnfs_free_lseg_list(&free_me);
1773
	return lseg;
F
Fred Isaman 已提交
1774

1775
out_forget:
F
Fred Isaman 已提交
1776 1777 1778
	spin_unlock(&ino->i_lock);
	lseg->pls_layout = lo;
	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1779
	return ERR_PTR(-EAGAIN);
1780 1781
}

1782
static void
1783 1784
pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
			 u32 seq)
1785 1786 1787 1788 1789 1790
{
	if (lo->plh_return_iomode == iomode)
		return;
	if (lo->plh_return_iomode != 0)
		iomode = IOMODE_ANY;
	lo->plh_return_iomode = iomode;
1791
	set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
1792 1793
	if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
		lo->plh_return_seq = seq;
1794 1795
}

1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
/**
 * 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.
 */
1806
int
1807 1808
pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
				struct list_head *tmp_list,
1809 1810
				const struct pnfs_layout_range *return_range,
				u32 seq)
1811 1812
{
	struct pnfs_layout_segment *lseg, *next;
1813
	int remaining = 0;
1814 1815 1816 1817

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

	if (list_empty(&lo->plh_segs))
1818
		return 0;
1819

1820
	assert_spin_locked(&lo->plh_inode->i_lock);
1821 1822 1823 1824 1825 1826 1827 1828

	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);
1829 1830 1831
			if (mark_lseg_invalid(lseg, tmp_list))
				continue;
			remaining++;
1832 1833
			set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
		}
1834 1835 1836 1837

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

1838
	return remaining;
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
}

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);
1851
	bool return_now = false;
1852 1853

	spin_lock(&inode->i_lock);
1854
	pnfs_set_plh_return_info(lo, range.iomode, lseg->pls_seq);
1855 1856 1857 1858 1859
	/*
	 * 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.
	 */
1860 1861
	if (!pnfs_mark_matching_lsegs_return(lo, &free_me,
						&range, lseg->pls_seq)) {
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
		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);
	}
1874 1875 1876 1877
	pnfs_free_lseg_list(&free_me);
}
EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);

1878 1879 1880
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
P
Peng Tao 已提交
1881 1882
	u64 rd_size = req->wb_bytes;

1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893
	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,
1894
						   false,
1895
						   GFP_KERNEL);
1896 1897 1898 1899 1900
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
1901
	}
1902 1903
	/* If no lseg, fall back to read through mds */
	if (pgio->pg_lseg == NULL)
1904
		nfs_pageio_reset_read_mds(pgio);
1905

1906 1907 1908 1909
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);

void
1910 1911
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
			   struct nfs_page *req, u64 wb_size)
1912
{
1913
	if (pgio->pg_lseg == NULL) {
1914 1915 1916 1917 1918
		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
						   req->wb_context,
						   req_offset(req),
						   wb_size,
						   IOMODE_RW,
1919
						   false,
1920
						   GFP_NOFS);
1921 1922 1923 1924 1925 1926
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
	}
1927 1928
	/* If no lseg, fall back to write through mds */
	if (pgio->pg_lseg == NULL)
1929
		nfs_pageio_reset_write_mds(pgio);
1930 1931 1932
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);

1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
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);

1943 1944 1945 1946 1947
/*
 * 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
1948 1949
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
		     struct nfs_page *prev, struct nfs_page *req)
1950
{
1951
	unsigned int size;
1952
	u64 seg_end, req_start, seg_left;
1953 1954 1955 1956

	size = nfs_generic_pg_test(pgio, prev, req);
	if (!size)
		return 0;
1957

1958
	/*
1959 1960 1961 1962 1963
	 * '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.
1964 1965 1966 1967 1968
	 *
	 * Please also note that 'end_offset' is actually the offset of the
	 * first byte that lies outside the pnfs_layout_range. FIXME?
	 *
	 */
1969
	if (pgio->pg_lseg) {
1970 1971 1972
		seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
				     pgio->pg_lseg->pls_range.length);
		req_start = req_offset(req);
1973
		WARN_ON_ONCE(req_start >= seg_end);
1974
		/* start of request is past the last byte of this segment */
1975 1976 1977 1978 1979 1980
		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);
1981
			return 0;
1982
		}
1983 1984 1985 1986 1987 1988

		/* 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;
1989
	}
1990

1991
	return size;
1992
}
1993
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1994

1995
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1996 1997 1998 1999
{
	struct nfs_pageio_descriptor pgio;

	/* Resend all requests through the MDS */
2000 2001
	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
			      hdr->completion_ops);
2002
	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2003
	return nfs_pageio_resend(&pgio, hdr);
2004
}
2005
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2006

2007
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2008
{
2009 2010 2011

	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2012
	    PNFS_LAYOUTRET_ON_ERROR) {
2013
		pnfs_return_layout(hdr->inode);
2014
	}
2015
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2016
		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2017 2018
}

2019 2020 2021
/*
 * Called by non rpc-based layout drivers
 */
2022
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2023
{
2024
	if (likely(!hdr->pnfs_error)) {
2025 2026
		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
				hdr->mds_offset + hdr->res.count);
2027
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2028 2029 2030
	}
	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
2031 2032
		pnfs_ld_handle_write_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2033
}
2034
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2035

2036 2037
static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2038
		struct nfs_pgio_header *hdr)
2039
{
2040
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2041

2042
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2043
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2044
		nfs_pageio_reset_write_mds(desc);
2045
		mirror->pg_recoalesce = 1;
2046
	}
2047
	nfs_pgio_data_destroy(hdr);
2048
	hdr->release(hdr);
2049 2050 2051
}

static enum pnfs_try_status
2052
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2053 2054 2055
			const struct rpc_call_ops *call_ops,
			struct pnfs_layout_segment *lseg,
			int how)
2056
{
2057
	struct inode *inode = hdr->inode;
2058 2059 2060
	enum pnfs_try_status trypnfs;
	struct nfs_server *nfss = NFS_SERVER(inode);

2061
	hdr->mds_ops = call_ops;
2062 2063

	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2064 2065
		inode->i_ino, hdr->args.count, hdr->args.offset, how);
	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2066
	if (trypnfs != PNFS_NOT_ATTEMPTED)
2067 2068 2069 2070 2071
		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}

2072
static void
2073 2074
pnfs_do_write(struct nfs_pageio_descriptor *desc,
	      struct nfs_pgio_header *hdr, int how)
2075 2076 2077
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2078
	enum pnfs_try_status trypnfs;
2079

2080
	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2081
	if (trypnfs == PNFS_NOT_ATTEMPTED)
2082
		pnfs_write_through_mds(desc, hdr);
2083 2084
}

2085 2086
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
{
2087
	pnfs_put_lseg(hdr->lseg);
2088
	nfs_pgio_header_free(hdr);
2089 2090
}

2091 2092 2093
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
2094
	struct nfs_pgio_header *hdr;
2095 2096
	int ret;

2097 2098
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2099 2100
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2101
	}
2102
	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2103

2104
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2105
	ret = nfs_generic_pgio(desc, hdr);
2106
	if (!ret)
2107
		pnfs_do_write(desc, hdr, desc->pg_ioflags);
2108

2109
	return ret;
2110 2111 2112
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);

2113
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2114 2115 2116
{
	struct nfs_pageio_descriptor pgio;

2117
	/* Resend all requests through the MDS */
2118 2119
	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
	return nfs_pageio_resend(&pgio, hdr);
2120
}
2121
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2122

2123
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2124
{
2125 2126
	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2127
	    PNFS_LAYOUTRET_ON_ERROR) {
2128
		pnfs_return_layout(hdr->inode);
2129
	}
2130
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2131
		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2132 2133
}

2134 2135 2136
/*
 * Called by non rpc-based layout drivers
 */
2137
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2138
{
2139
	if (likely(!hdr->pnfs_error)) {
2140 2141
		__nfs4_read_done_cb(hdr);
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2142 2143 2144
	}
	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
2145 2146
		pnfs_ld_handle_read_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2147 2148 2149
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);

2150 2151
static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2152
		struct nfs_pgio_header *hdr)
2153
{
2154
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2155

2156
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2157
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2158
		nfs_pageio_reset_read_mds(desc);
2159
		mirror->pg_recoalesce = 1;
2160
	}
2161
	nfs_pgio_data_destroy(hdr);
2162
	hdr->release(hdr);
2163 2164
}

A
Andy Adamson 已提交
2165 2166 2167
/*
 * Call the appropriate parallel I/O subsystem read function.
 */
2168
static enum pnfs_try_status
2169
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2170 2171
		       const struct rpc_call_ops *call_ops,
		       struct pnfs_layout_segment *lseg)
A
Andy Adamson 已提交
2172
{
2173
	struct inode *inode = hdr->inode;
A
Andy Adamson 已提交
2174 2175 2176
	struct nfs_server *nfss = NFS_SERVER(inode);
	enum pnfs_try_status trypnfs;

2177
	hdr->mds_ops = call_ops;
A
Andy Adamson 已提交
2178 2179

	dprintk("%s: Reading ino:%lu %u@%llu\n",
2180
		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
A
Andy Adamson 已提交
2181

2182
	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2183
	if (trypnfs != PNFS_NOT_ATTEMPTED)
A
Andy Adamson 已提交
2184 2185 2186 2187
		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}
A
Andy Adamson 已提交
2188

2189
/* Resend all requests through pnfs. */
2190
void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2191 2192 2193
{
	struct nfs_pageio_descriptor pgio;

2194 2195 2196 2197 2198
	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);
	}
2199 2200 2201
}
EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);

2202
static void
2203
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2204 2205 2206
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2207
	enum pnfs_try_status trypnfs;
2208

2209
	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2210
	if (trypnfs == PNFS_TRY_AGAIN)
2211 2212
		pnfs_read_resend_pnfs(hdr);
	if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
2213
		pnfs_read_through_mds(desc, hdr);
2214 2215
}

2216 2217
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
{
2218
	pnfs_put_lseg(hdr->lseg);
2219
	nfs_pgio_header_free(hdr);
2220 2221
}

2222 2223 2224
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
2225
	struct nfs_pgio_header *hdr;
2226 2227
	int ret;

2228 2229
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2230 2231
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2232
	}
2233
	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2234
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2235
	ret = nfs_generic_pgio(desc, hdr);
2236
	if (!ret)
2237
		pnfs_do_read(desc, hdr);
2238
	return ret;
2239 2240 2241
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);

2242 2243 2244 2245 2246
static void pnfs_clear_layoutcommitting(struct inode *inode)
{
	unsigned long *bitlock = &NFS_I(inode)->flags;

	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2247
	smp_mb__after_atomic();
2248 2249 2250
	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
}

A
Andy Adamson 已提交
2251
/*
2252
 * There can be multiple RW segments.
A
Andy Adamson 已提交
2253
 */
2254
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
A
Andy Adamson 已提交
2255
{
2256
	struct pnfs_layout_segment *lseg;
A
Andy Adamson 已提交
2257

2258 2259
	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
		if (lseg->pls_range.iomode == IOMODE_RW &&
2260
		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2261 2262
			list_add(&lseg->pls_lc_list, listp);
	}
A
Andy Adamson 已提交
2263 2264
}

2265 2266 2267 2268 2269 2270 2271 2272 2273 2274
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);
	}

2275
	pnfs_clear_layoutcommitting(inode);
2276 2277
}

P
Peng Tao 已提交
2278 2279
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
{
2280
	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
P
Peng Tao 已提交
2281 2282 2283
}
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);

A
Andy Adamson 已提交
2284
void
2285 2286
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
		loff_t end_pos)
A
Andy Adamson 已提交
2287
{
2288
	struct nfs_inode *nfsi = NFS_I(inode);
2289
	bool mark_as_dirty = false;
A
Andy Adamson 已提交
2290

2291
	spin_lock(&inode->i_lock);
A
Andy Adamson 已提交
2292
	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2293
		nfsi->layout->plh_lwb = end_pos;
2294
		mark_as_dirty = true;
A
Andy Adamson 已提交
2295
		dprintk("%s: Set layoutcommit for inode %lu ",
2296
			__func__, inode->i_ino);
2297 2298
	} else if (end_pos > nfsi->layout->plh_lwb)
		nfsi->layout->plh_lwb = end_pos;
2299
	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2300
		/* references matched in nfs4_layoutcommit_release */
2301
		pnfs_get_lseg(lseg);
2302
	}
2303
	spin_unlock(&inode->i_lock);
2304
	dprintk("%s: lseg %p end_pos %llu\n",
2305
		__func__, lseg, nfsi->layout->plh_lwb);
2306 2307 2308 2309

	/* 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)
2310
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2311 2312 2313
}
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);

A
Andy Adamson 已提交
2314 2315 2316 2317 2318 2319
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);
2320
	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
A
Andy Adamson 已提交
2321 2322
}

2323 2324 2325 2326 2327 2328 2329 2330
/*
 * 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
2331
int
2332
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
A
Andy Adamson 已提交
2333
{
2334
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
A
Andy Adamson 已提交
2335 2336 2337
	struct nfs4_layoutcommit_data *data;
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t end_pos;
2338
	int status;
A
Andy Adamson 已提交
2339

2340
	if (!pnfs_layoutcommit_outstanding(inode))
2341 2342
		return 0;

2343
	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
P
Peng Tao 已提交
2344

2345
	status = -EAGAIN;
P
Peng Tao 已提交
2346
	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2347 2348
		if (!sync)
			goto out;
2349
		status = wait_on_bit_lock_action(&nfsi->flags,
2350 2351 2352
				NFS_INO_LAYOUTCOMMITTING,
				nfs_wait_bit_killable,
				TASK_KILLABLE);
P
Peng Tao 已提交
2353
		if (status)
2354
			goto out;
P
Peng Tao 已提交
2355 2356
	}

2357 2358 2359 2360 2361 2362 2363
	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;
2364
	spin_lock(&inode->i_lock);
2365 2366
	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
		goto out_unlock;
2367

2368
	INIT_LIST_HEAD(&data->lseg_list);
2369
	pnfs_list_write_lseg(inode, &data->lseg_list);
A
Andy Adamson 已提交
2370

2371
	end_pos = nfsi->layout->plh_lwb;
A
Andy Adamson 已提交
2372

2373
	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
A
Andy Adamson 已提交
2374 2375 2376
	spin_unlock(&inode->i_lock);

	data->args.inode = inode;
2377
	data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
A
Andy Adamson 已提交
2378 2379 2380 2381 2382 2383
	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);

2384 2385 2386
	if (ld->prepare_layoutcommit) {
		status = ld->prepare_layoutcommit(&data->args);
		if (status) {
2387
			put_rpccred(data->cred);
2388
			spin_lock(&inode->i_lock);
2389 2390
			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
			if (end_pos > nfsi->layout->plh_lwb)
2391
				nfsi->layout->plh_lwb = end_pos;
2392
			goto out_unlock;
2393 2394 2395 2396
		}
	}


A
Andy Adamson 已提交
2397 2398
	status = nfs4_proc_layoutcommit(data, sync);
out:
P
Peng Tao 已提交
2399 2400
	if (status)
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2401 2402
	dprintk("<-- %s status %d\n", __func__, status);
	return status;
2403 2404
out_unlock:
	spin_unlock(&inode->i_lock);
P
Peng Tao 已提交
2405
	kfree(data);
2406 2407
clear_layoutcommitting:
	pnfs_clear_layoutcommitting(inode);
P
Peng Tao 已提交
2408
	goto out;
A
Andy Adamson 已提交
2409
}
2410
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2411

2412 2413 2414 2415 2416 2417 2418
int
pnfs_generic_sync(struct inode *inode, bool datasync)
{
	return pnfs_layoutcommit_inode(inode, true);
}
EXPORT_SYMBOL_GPL(pnfs_generic_sync);

2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
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;
}
2430

2431
#if IS_ENABLED(CONFIG_NFS_V4_2)
2432
int
2433
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2434 2435 2436
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
	struct nfs_server *server = NFS_SERVER(inode);
2437
	struct nfs_inode *nfsi = NFS_I(inode);
2438 2439 2440 2441 2442 2443 2444
	struct nfs42_layoutstat_data *data;
	struct pnfs_layout_hdr *hdr;
	int status = 0;

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

2445 2446 2447
	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
		goto out;

2448 2449 2450
	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
		goto out;

2451 2452 2453
	spin_lock(&inode->i_lock);
	if (!NFS_I(inode)->layout) {
		spin_unlock(&inode->i_lock);
2454
		goto out_clear_layoutstats;
2455 2456 2457 2458 2459
	}
	hdr = NFS_I(inode)->layout;
	pnfs_get_layout_hdr(hdr);
	spin_unlock(&inode->i_lock);

2460
	data = kzalloc(sizeof(*data), gfp_flags);
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482
	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);
2483
out_clear_layoutstats:
2484 2485 2486
	smp_mb__before_atomic();
	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
	smp_mb__after_atomic();
2487 2488 2489
	goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2490
#endif
2491 2492 2493 2494

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