pnfs.c 63.4 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
	loff_t i_size;
872 873

	dprintk("--> %s\n", __func__);
874

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
	/*
	 * Synchronously retrieve layout information from server and
	 * store in lseg. If we race with a concurrent seqid morphing
	 * op, then re-send the LAYOUTGET.
	 */
	do {
		lgp = kzalloc(sizeof(*lgp), gfp_flags);
		if (lgp == NULL)
			return NULL;

		i_size = i_size_read(ino);

		lgp->args.minlength = PAGE_CACHE_SIZE;
		if (lgp->args.minlength > range->length)
			lgp->args.minlength = range->length;
		if (range->iomode == IOMODE_READ) {
			if (range->offset >= i_size)
				lgp->args.minlength = 0;
			else if (i_size - range->offset < lgp->args.minlength)
				lgp->args.minlength = i_size - range->offset;
		}
		lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
		lgp->args.range = *range;
		lgp->args.type = server->pnfs_curr_ld->id;
		lgp->args.inode = ino;
		lgp->args.ctx = get_nfs_open_context(ctx);
		lgp->gfp_flags = gfp_flags;
		lgp->cred = lo->plh_lc_cred;
903

904 905
		lseg = nfs4_proc_layoutget(lgp, gfp_flags);
	} while (lseg == ERR_PTR(-EAGAIN));
906

907 908 909
	if (IS_ERR(lseg) && !nfs_error_is_fatal(PTR_ERR(lseg)))
		lseg = NULL;
	else
910 911
		pnfs_layout_clear_fail_bit(lo,
				pnfs_iomode_to_fail_bit(range->iomode));
912

913 914 915
	return lseg;
}

916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
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);
	}
}

931 932 933 934 935
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);
936
	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
937 938
}

939 940
static int
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
941
		       enum pnfs_iomode iomode, bool sync)
942 943 944 945 946
{
	struct inode *ino = lo->plh_inode;
	struct nfs4_layoutreturn *lrp;
	int status = 0;

947
	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
948 949 950
	if (unlikely(lrp == NULL)) {
		status = -ENOMEM;
		spin_lock(&ino->i_lock);
951
		pnfs_clear_layoutreturn_waitbit(lo);
952 953 954 955 956 957 958 959
		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
960 961 962
	lrp->args.range.iomode = iomode;
	lrp->args.range.offset = 0;
	lrp->args.range.length = NFS4_MAX_UINT64;
963 964 965 966
	lrp->args.layout = lo;
	lrp->clp = NFS_SERVER(ino)->nfs_client;
	lrp->cred = lo->plh_lc_cred;

967
	status = nfs4_proc_layoutreturn(lrp, sync);
968 969 970 971 972
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}

973 974 975 976 977 978 979 980
/*
 * 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
981 982 983 984 985 986 987
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;
988
	int status = 0, empty;
989
	bool send;
B
Benny Halevy 已提交
990

991
	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
B
Benny Halevy 已提交
992 993 994

	spin_lock(&ino->i_lock);
	lo = nfsi->layout;
995
	if (!lo) {
B
Benny Halevy 已提交
996
		spin_unlock(&ino->i_lock);
997 998
		dprintk("NFS: %s no layout to return\n", __func__);
		goto out;
B
Benny Halevy 已提交
999 1000 1001
	}
	stateid = nfsi->layout->plh_stateid;
	/* Reference matched in nfs4_layoutreturn_release */
1002
	pnfs_get_layout_hdr(lo);
1003
	empty = list_empty(&lo->plh_segs);
1004
	pnfs_clear_layoutcommit(ino, &tmp_list);
1005
	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015

	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);
	}

1016 1017 1018 1019
	/* 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__);
1020
		goto out_put_layout_hdr;
1021
	}
1022 1023

	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1024
	send = pnfs_prepare_layoutreturn(lo);
B
Benny Halevy 已提交
1025 1026
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&tmp_list);
1027 1028 1029 1030
	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
1031 1032 1033 1034
out:
	dprintk("<-- %s status: %d\n", __func__, status);
	return status;
}
1035
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
B
Benny Halevy 已提交
1036

1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
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
1064 1065
bool pnfs_roc(struct inode *ino)
{
1066 1067 1068
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_open_context *ctx;
	struct nfs4_state *state;
F
Fred Isaman 已提交
1069 1070
	struct pnfs_layout_hdr *lo;
	struct pnfs_layout_segment *lseg, *tmp;
1071
	nfs4_stateid stateid;
F
Fred Isaman 已提交
1072
	LIST_HEAD(tmp_list);
1073
	bool found = false, layoutreturn = false, roc = false;
F
Fred Isaman 已提交
1074 1075

	spin_lock(&ino->i_lock);
1076
	lo = nfsi->layout;
P
Peng Tao 已提交
1077
	if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1078 1079
		goto out_noroc;

1080
	/* no roc if we hold a delegation */
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
	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;
	}

1091 1092 1093 1094 1095 1096
	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);

1097
	pnfs_clear_retry_layoutget(lo);
F
Fred Isaman 已提交
1098
	list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1099 1100
		/* 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
1101 1102 1103
			mark_lseg_invalid(lseg, &tmp_list);
			found = true;
		}
1104
	/* ROC in two conditions:
1105 1106 1107
	 * 1. there are ROC lsegs
	 * 2. we don't send layoutreturn
	 */
1108 1109 1110
	if (found && !layoutreturn) {
		/* lo ref dropped in pnfs_roc_release() */
		pnfs_get_layout_hdr(lo);
1111
		roc = true;
1112
	}
F
Fred Isaman 已提交
1113

1114
out_noroc:
F
Fred Isaman 已提交
1115
	spin_unlock(&ino->i_lock);
1116 1117 1118
	pnfs_free_lseg_list(&tmp_list);
	pnfs_layoutcommit_inode(ino, true);
	if (layoutreturn)
1119
		pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1120
	return roc;
F
Fred Isaman 已提交
1121 1122 1123 1124 1125 1126 1127 1128
}

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

	spin_lock(&ino->i_lock);
	lo = NFS_I(ino)->layout;
1129
	pnfs_clear_layoutreturn_waitbit(lo);
1130 1131 1132 1133 1134 1135
	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
1136 1137 1138 1139 1140 1141 1142 1143
}

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;
1144
	if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
F
Fred Isaman 已提交
1145 1146
		lo->plh_barrier = barrier;
	spin_unlock(&ino->i_lock);
1147
	trace_nfs4_layoutreturn_on_close(ino, 0);
F
Fred Isaman 已提交
1148 1149
}

1150
void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
F
Fred Isaman 已提交
1151 1152
{
	struct nfs_inode *nfsi = NFS_I(ino);
1153 1154
	struct pnfs_layout_hdr *lo;
	u32 current_seqid;
F
Fred Isaman 已提交
1155 1156

	spin_lock(&ino->i_lock);
1157 1158
	lo = nfsi->layout;
	current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
F
Fred Isaman 已提交
1159

1160 1161 1162 1163
	/* 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
1164 1165 1166
	spin_unlock(&ino->i_lock);
}

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
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;
}

1187 1188 1189 1190 1191 1192
/*
 * 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
1193
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1194
	   const struct pnfs_layout_range *l2)
1195
{
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
	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;

1208
	/* read > read/write */
1209
	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1210 1211
}

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
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)
1234
{
1235
	struct pnfs_layout_segment *lp, *tmp;
1236

1237 1238
	dprintk("%s:Begin\n", __func__);

1239 1240 1241 1242 1243 1244 1245 1246
	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))
1247
			continue;
1248
		list_add_tail(&lseg->pls_list, &lp->pls_list);
1249 1250 1251
		dprintk("%s: inserted lseg %p "
			"iomode %d offset %llu length %llu before "
			"lp %p iomode %d offset %llu length %llu\n",
1252 1253 1254 1255
			__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);
1256
		goto out;
1257
	}
1258 1259 1260 1261 1262 1263
	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:
1264
	pnfs_get_layout_hdr(lo);
1265 1266

	dprintk("%s:Return\n", __func__);
1267
}
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
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);
}
1286 1287

static struct pnfs_layout_hdr *
1288 1289 1290
alloc_init_layout_hdr(struct inode *ino,
		      struct nfs_open_context *ctx,
		      gfp_t gfp_flags)
1291 1292 1293
{
	struct pnfs_layout_hdr *lo;

1294
	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1295 1296
	if (!lo)
		return NULL;
1297
	atomic_set(&lo->plh_refcount, 1);
1298 1299
	INIT_LIST_HEAD(&lo->plh_layouts);
	INIT_LIST_HEAD(&lo->plh_segs);
1300
	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1301
	lo->plh_inode = ino;
1302
	lo->plh_lc_cred = get_rpccred(ctx->cred);
1303 1304 1305 1306
	return lo;
}

static struct pnfs_layout_hdr *
1307 1308 1309
pnfs_find_alloc_layout(struct inode *ino,
		       struct nfs_open_context *ctx,
		       gfp_t gfp_flags)
1310 1311 1312 1313 1314 1315
{
	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);

1316 1317
	if (nfsi->layout != NULL)
		goto out_existing;
1318
	spin_unlock(&ino->i_lock);
1319
	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1320 1321
	spin_lock(&ino->i_lock);

1322
	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1323
		nfsi->layout = new;
1324
		return new;
1325 1326
	} else if (new != NULL)
		pnfs_free_layout_hdr(new);
1327 1328
out_existing:
	pnfs_get_layout_hdr(nfsi->layout);
1329 1330 1331
	return nfsi->layout;
}

1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
/*
 * iomode matching rules:
 * iomode	lseg	match
 * -----	-----	-----
 * ANY		READ	true
 * ANY		RW	true
 * RW		READ	false
 * RW		RW	true
 * READ		READ	true
 * READ		RW	true
 */
1343
static bool
1344
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1345
		 const struct pnfs_layout_range *range)
1346
{
1347 1348 1349 1350
	struct pnfs_layout_range range1;

	if ((range->iomode == IOMODE_RW &&
	     ls_range->iomode != IOMODE_RW) ||
1351
	    !pnfs_lseg_range_intersecting(ls_range, range))
1352 1353 1354 1355 1356
		return 0;

	/* range1 covers only the first byte in the range */
	range1 = *range;
	range1.length = 1;
1357
	return pnfs_lseg_range_contained(ls_range, &range1);
1358 1359 1360 1361 1362
}

/*
 * lookup range in layout
 */
1363
static struct pnfs_layout_segment *
1364 1365
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
		struct pnfs_layout_range *range)
1366
{
1367 1368 1369 1370
	struct pnfs_layout_segment *lseg, *ret = NULL;

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

1371
	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1372
		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1373
		    !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1374
		    pnfs_lseg_range_match(&lseg->pls_range, range)) {
1375
			ret = pnfs_get_lseg(lseg);
1376 1377 1378 1379 1380
			break;
		}
	}

	dprintk("%s:Return lseg %p ref %d\n",
1381
		__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1382
	return ret;
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 1457 1458 1459
/*
 * 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;
}

1460
/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1461
static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key, int mode)
1462 1463 1464
{
	if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
		return 1;
1465
	return nfs_wait_bit_killable(key, mode);
1466 1467 1468 1469
}

static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
{
1470 1471
	if (!pnfs_should_retry_layoutget(lo))
		return false;
1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
	/*
	 * 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);
}

1482 1483 1484 1485 1486 1487 1488 1489 1490
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);
}

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

1515
	if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1516
		trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1517
				 PNFS_UPDATE_LAYOUT_NO_PNFS);
1518
		goto out;
1519
	}
1520

1521
	if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1522
		trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1523
				 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1524
		goto out;
1525
	}
1526

1527
	if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1528
		trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1529
				 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1530
		goto out;
1531
	}
1532

1533 1534
lookup_again:
	first = false;
1535
	spin_lock(&ino->i_lock);
1536
	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1537 1538
	if (lo == NULL) {
		spin_unlock(&ino->i_lock);
1539
		trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1540
				 PNFS_UPDATE_LAYOUT_NOMEM);
1541 1542
		goto out;
	}
1543

F
Fred Isaman 已提交
1544
	/* Do we even need to bother with this? */
1545
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1546
		trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1547
				 PNFS_UPDATE_LAYOUT_BULK_RECALL);
F
Fred Isaman 已提交
1548
		dprintk("%s matches recall, use MDS\n", __func__);
1549 1550 1551 1552
		goto out_unlock;
	}

	/* if LAYOUTGET already failed once we don't try again */
1553
	if (pnfs_layout_io_test_failed(lo, iomode) &&
1554
	    !pnfs_should_retry_layoutget(lo)) {
1555
		trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1556
				 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1557
		goto out_unlock;
1558
	}
1559

1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
	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);
1578
		if (lseg) {
1579
			trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1580
					PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1581
			goto out_unlock;
1582
		}
1583
	}
1584

1585 1586 1587 1588
	/*
	 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
	 * for LAYOUTRETURN even if first is true.
	 */
1589
	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1590 1591 1592
		spin_unlock(&ino->i_lock);
		dprintk("%s wait for layoutreturn\n", __func__);
		if (pnfs_prepare_to_retry_layoutget(lo)) {
1593 1594
			if (first)
				pnfs_clear_first_layoutget(lo);
1595 1596 1597 1598
			pnfs_put_layout_hdr(lo);
			dprintk("%s retrying\n", __func__);
			goto lookup_again;
		}
1599
		trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1600
				PNFS_UPDATE_LAYOUT_RETURN);
1601 1602 1603
		goto out_put_layout_hdr;
	}

1604
	if (pnfs_layoutgets_blocked(lo)) {
1605
		trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1606
				PNFS_UPDATE_LAYOUT_BLOCKED);
1607
		goto out_unlock;
1608
	}
1609
	atomic_inc(&lo->plh_outstanding);
1610
	spin_unlock(&ino->i_lock);
1611

1612
	if (list_empty(&lo->plh_layouts)) {
1613 1614 1615 1616
		/* 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);
1617 1618
		if (list_empty(&lo->plh_layouts))
			list_add_tail(&lo->plh_layouts, &server->layouts);
1619 1620
		spin_unlock(&clp->cl_lock);
	}
1621

1622 1623 1624 1625 1626
	pg_offset = arg.offset & ~PAGE_CACHE_MASK;
	if (pg_offset) {
		arg.offset -= pg_offset;
		arg.length += pg_offset;
	}
1627 1628
	if (arg.length != NFS4_MAX_UINT64)
		arg.length = PAGE_CACHE_ALIGN(arg.length);
1629

1630
	lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1631
	pnfs_clear_retry_layoutget(lo);
1632
	atomic_dec(&lo->plh_outstanding);
1633
	trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1634
				 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1635
out_put_layout_hdr:
1636 1637
	if (first)
		pnfs_clear_first_layoutget(lo);
1638
	pnfs_put_layout_hdr(lo);
1639
out:
1640 1641 1642 1643
	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),
1644
			IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1645 1646 1647
			iomode==IOMODE_RW ?  "read/write" : "read-only",
			(unsigned long long)pos,
			(unsigned long long)count);
1648 1649 1650
	return lseg;
out_unlock:
	spin_unlock(&ino->i_lock);
1651
	goto out_put_layout_hdr;
1652
}
1653
EXPORT_SYMBOL_GPL(pnfs_update_layout);
1654

1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
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;
}

1675
struct pnfs_layout_segment *
1676 1677 1678 1679 1680
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;
1681
	struct inode *ino = lo->plh_inode;
1682
	LIST_HEAD(free_me);
1683 1684 1685 1686
	int status = -EINVAL;

	if (!pnfs_sanity_check_layout_range(&res->range))
		goto out;
1687 1688

	/* Inject layout blob into I/O device driver */
1689
	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
	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;
	}

1700 1701 1702
	init_lseg(lo, lseg);
	lseg->pls_range = res->range;

1703
	spin_lock(&ino->i_lock);
1704
	if (pnfs_layoutgets_blocked(lo)) {
F
Fred Isaman 已提交
1705 1706 1707
		dprintk("%s forget reply due to state\n", __func__);
		goto out_forget_reply;
	}
1708

1709 1710 1711 1712
	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__);
1713
			status = -EAGAIN;
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
			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);
	}
1728

1729 1730
	clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);

1731
	pnfs_get_lseg(lseg);
1732
	pnfs_layout_insert_lseg(lo, lseg, &free_me);
1733

P
Peng Tao 已提交
1734
	if (res->return_on_close)
F
Fred Isaman 已提交
1735 1736
		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);

1737
	spin_unlock(&ino->i_lock);
1738
	pnfs_free_lseg_list(&free_me);
1739
	return lseg;
1740
out:
1741
	return ERR_PTR(status);
F
Fred Isaman 已提交
1742 1743 1744 1745 1746 1747

out_forget_reply:
	spin_unlock(&ino->i_lock);
	lseg->pls_layout = lo;
	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
	goto out;
1748 1749
}

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770
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);
1771 1772
			set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
					&lo->plh_flags);
1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
		}
}

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);

1806 1807 1808
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
P
Peng Tao 已提交
1809 1810
	u64 rd_size = req->wb_bytes;

1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822
	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);
1823 1824 1825 1826 1827
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
1828
	}
1829 1830
	/* If no lseg, fall back to read through mds */
	if (pgio->pg_lseg == NULL)
1831
		nfs_pageio_reset_read_mds(pgio);
1832

1833 1834 1835 1836
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);

void
1837 1838
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
			   struct nfs_page *req, u64 wb_size)
1839
{
1840
	if (pgio->pg_lseg == NULL) {
1841 1842 1843 1844 1845 1846
		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
						   req->wb_context,
						   req_offset(req),
						   wb_size,
						   IOMODE_RW,
						   GFP_NOFS);
1847 1848 1849 1850 1851 1852
		if (IS_ERR(pgio->pg_lseg)) {
			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
			pgio->pg_lseg = NULL;
			return;
		}
	}
1853 1854
	/* If no lseg, fall back to write through mds */
	if (pgio->pg_lseg == NULL)
1855
		nfs_pageio_reset_write_mds(pgio);
1856 1857 1858
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);

1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
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);

1869 1870 1871 1872 1873
/*
 * 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
1874 1875
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
		     struct nfs_page *prev, struct nfs_page *req)
1876
{
1877
	unsigned int size;
1878
	u64 seg_end, req_start, seg_left;
1879 1880 1881 1882

	size = nfs_generic_pg_test(pgio, prev, req);
	if (!size)
		return 0;
1883

1884
	/*
1885 1886 1887 1888 1889
	 * '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.
1890 1891 1892 1893 1894
	 *
	 * Please also note that 'end_offset' is actually the offset of the
	 * first byte that lies outside the pnfs_layout_range. FIXME?
	 *
	 */
1895
	if (pgio->pg_lseg) {
1896 1897 1898
		seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
				     pgio->pg_lseg->pls_range.length);
		req_start = req_offset(req);
1899
		WARN_ON_ONCE(req_start >= seg_end);
1900
		/* start of request is past the last byte of this segment */
1901 1902 1903 1904 1905 1906
		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);
1907
			return 0;
1908
		}
1909 1910 1911 1912 1913 1914

		/* 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;
1915
	}
1916

1917
	return size;
1918
}
1919
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1920

1921
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1922 1923 1924 1925
{
	struct nfs_pageio_descriptor pgio;

	/* Resend all requests through the MDS */
1926 1927
	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
			      hdr->completion_ops);
1928
	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1929
	return nfs_pageio_resend(&pgio, hdr);
1930
}
1931
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1932

1933
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1934
{
1935 1936 1937

	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1938
	    PNFS_LAYOUTRET_ON_ERROR) {
1939
		pnfs_return_layout(hdr->inode);
1940
	}
1941
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1942
		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1943 1944
}

1945 1946 1947
/*
 * Called by non rpc-based layout drivers
 */
1948
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1949
{
1950
	if (likely(!hdr->pnfs_error)) {
1951 1952
		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
				hdr->mds_offset + hdr->res.count);
1953
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1954 1955 1956
	}
	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
1957 1958
		pnfs_ld_handle_write_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
1959
}
1960
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1961

1962 1963
static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1964
		struct nfs_pgio_header *hdr)
1965
{
1966
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1967

1968
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1969
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1970
		nfs_pageio_reset_write_mds(desc);
1971
		mirror->pg_recoalesce = 1;
1972
	}
1973
	nfs_pgio_data_destroy(hdr);
1974
	hdr->release(hdr);
1975 1976 1977
}

static enum pnfs_try_status
1978
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
1979 1980 1981
			const struct rpc_call_ops *call_ops,
			struct pnfs_layout_segment *lseg,
			int how)
1982
{
1983
	struct inode *inode = hdr->inode;
1984 1985 1986
	enum pnfs_try_status trypnfs;
	struct nfs_server *nfss = NFS_SERVER(inode);

1987
	hdr->mds_ops = call_ops;
1988 1989

	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1990 1991
		inode->i_ino, hdr->args.count, hdr->args.offset, how);
	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
1992
	if (trypnfs != PNFS_NOT_ATTEMPTED)
1993 1994 1995 1996 1997
		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}

1998
static void
1999 2000
pnfs_do_write(struct nfs_pageio_descriptor *desc,
	      struct nfs_pgio_header *hdr, int how)
2001 2002 2003
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2004
	enum pnfs_try_status trypnfs;
2005

2006
	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2007
	if (trypnfs == PNFS_NOT_ATTEMPTED)
2008
		pnfs_write_through_mds(desc, hdr);
2009 2010
}

2011 2012
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
{
2013
	pnfs_put_lseg(hdr->lseg);
2014
	nfs_pgio_header_free(hdr);
2015 2016
}

2017 2018 2019
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
2020
	struct nfs_pgio_header *hdr;
2021 2022
	int ret;

2023 2024
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2025 2026
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2027
	}
2028
	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2029

2030
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2031
	ret = nfs_generic_pgio(desc, hdr);
2032
	if (!ret)
2033
		pnfs_do_write(desc, hdr, desc->pg_ioflags);
2034

2035
	return ret;
2036 2037 2038
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);

2039
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2040 2041 2042
{
	struct nfs_pageio_descriptor pgio;

2043
	/* Resend all requests through the MDS */
2044 2045
	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
	return nfs_pageio_resend(&pgio, hdr);
2046
}
2047
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2048

2049
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2050
{
2051 2052
	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2053
	    PNFS_LAYOUTRET_ON_ERROR) {
2054
		pnfs_return_layout(hdr->inode);
2055
	}
2056
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2057
		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2058 2059
}

2060 2061 2062
/*
 * Called by non rpc-based layout drivers
 */
2063
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2064
{
2065
	if (likely(!hdr->pnfs_error)) {
2066 2067
		__nfs4_read_done_cb(hdr);
		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2068 2069 2070
	}
	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
	if (unlikely(hdr->pnfs_error))
2071 2072
		pnfs_ld_handle_read_error(hdr);
	hdr->mds_ops->rpc_release(hdr);
2073 2074 2075
}
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);

2076 2077
static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2078
		struct nfs_pgio_header *hdr)
2079
{
2080
	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2081

2082
	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2083
		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2084
		nfs_pageio_reset_read_mds(desc);
2085
		mirror->pg_recoalesce = 1;
2086
	}
2087
	nfs_pgio_data_destroy(hdr);
2088
	hdr->release(hdr);
2089 2090
}

A
Andy Adamson 已提交
2091 2092 2093
/*
 * Call the appropriate parallel I/O subsystem read function.
 */
2094
static enum pnfs_try_status
2095
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2096 2097
		       const struct rpc_call_ops *call_ops,
		       struct pnfs_layout_segment *lseg)
A
Andy Adamson 已提交
2098
{
2099
	struct inode *inode = hdr->inode;
A
Andy Adamson 已提交
2100 2101 2102
	struct nfs_server *nfss = NFS_SERVER(inode);
	enum pnfs_try_status trypnfs;

2103
	hdr->mds_ops = call_ops;
A
Andy Adamson 已提交
2104 2105

	dprintk("%s: Reading ino:%lu %u@%llu\n",
2106
		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
A
Andy Adamson 已提交
2107

2108
	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2109
	if (trypnfs != PNFS_NOT_ATTEMPTED)
A
Andy Adamson 已提交
2110 2111 2112 2113
		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
	return trypnfs;
}
A
Andy Adamson 已提交
2114

2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
/* 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);

2125
static void
2126
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2127 2128 2129
{
	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2130
	enum pnfs_try_status trypnfs;
2131
	int err = 0;
2132

2133
	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2134 2135 2136
	if (trypnfs == PNFS_TRY_AGAIN)
		err = pnfs_read_resend_pnfs(hdr);
	if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2137
		pnfs_read_through_mds(desc, hdr);
2138 2139
}

2140 2141
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
{
2142
	pnfs_put_lseg(hdr->lseg);
2143
	nfs_pgio_header_free(hdr);
2144 2145
}

2146 2147 2148
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
2149
	struct nfs_pgio_header *hdr;
2150 2151
	int ret;

2152 2153
	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
	if (!hdr) {
P
Peng Tao 已提交
2154 2155
		desc->pg_error = -ENOMEM;
		return desc->pg_error;
2156
	}
2157
	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2158
	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2159
	ret = nfs_generic_pgio(desc, hdr);
2160
	if (!ret)
2161
		pnfs_do_read(desc, hdr);
2162
	return ret;
2163 2164 2165
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);

2166 2167 2168 2169 2170
static void pnfs_clear_layoutcommitting(struct inode *inode)
{
	unsigned long *bitlock = &NFS_I(inode)->flags;

	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2171
	smp_mb__after_atomic();
2172 2173 2174
	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
}

A
Andy Adamson 已提交
2175
/*
2176
 * There can be multiple RW segments.
A
Andy Adamson 已提交
2177
 */
2178
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
A
Andy Adamson 已提交
2179
{
2180
	struct pnfs_layout_segment *lseg;
A
Andy Adamson 已提交
2181

2182 2183
	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
		if (lseg->pls_range.iomode == IOMODE_RW &&
2184
		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2185 2186
			list_add(&lseg->pls_lc_list, listp);
	}
A
Andy Adamson 已提交
2187 2188
}

2189 2190 2191 2192 2193 2194 2195 2196 2197 2198
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);
	}

2199
	pnfs_clear_layoutcommitting(inode);
2200 2201
}

P
Peng Tao 已提交
2202 2203
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
{
2204
	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
P
Peng Tao 已提交
2205 2206 2207
}
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);

A
Andy Adamson 已提交
2208
void
2209 2210
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
		loff_t end_pos)
A
Andy Adamson 已提交
2211
{
2212
	struct nfs_inode *nfsi = NFS_I(inode);
2213
	bool mark_as_dirty = false;
A
Andy Adamson 已提交
2214

2215
	spin_lock(&inode->i_lock);
A
Andy Adamson 已提交
2216
	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2217
		nfsi->layout->plh_lwb = end_pos;
2218
		mark_as_dirty = true;
A
Andy Adamson 已提交
2219
		dprintk("%s: Set layoutcommit for inode %lu ",
2220
			__func__, inode->i_ino);
2221 2222
	} else if (end_pos > nfsi->layout->plh_lwb)
		nfsi->layout->plh_lwb = end_pos;
2223
	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2224
		/* references matched in nfs4_layoutcommit_release */
2225
		pnfs_get_lseg(lseg);
2226
	}
2227
	spin_unlock(&inode->i_lock);
2228
	dprintk("%s: lseg %p end_pos %llu\n",
2229
		__func__, lseg, nfsi->layout->plh_lwb);
2230 2231 2232 2233

	/* 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)
2234
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2235 2236 2237
}
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);

A
Andy Adamson 已提交
2238 2239 2240 2241 2242 2243
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);
2244
	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
A
Andy Adamson 已提交
2245 2246
}

2247 2248 2249 2250 2251 2252 2253 2254
/*
 * 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
2255
int
2256
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
A
Andy Adamson 已提交
2257
{
2258
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
A
Andy Adamson 已提交
2259 2260 2261
	struct nfs4_layoutcommit_data *data;
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t end_pos;
2262
	int status;
A
Andy Adamson 已提交
2263

2264
	if (!pnfs_layoutcommit_outstanding(inode))
2265 2266
		return 0;

2267
	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
P
Peng Tao 已提交
2268

2269
	status = -EAGAIN;
P
Peng Tao 已提交
2270
	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2271 2272
		if (!sync)
			goto out;
2273
		status = wait_on_bit_lock_action(&nfsi->flags,
2274 2275 2276
				NFS_INO_LAYOUTCOMMITTING,
				nfs_wait_bit_killable,
				TASK_KILLABLE);
P
Peng Tao 已提交
2277
		if (status)
2278
			goto out;
P
Peng Tao 已提交
2279 2280
	}

2281 2282 2283 2284 2285 2286 2287
	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;
2288
	spin_lock(&inode->i_lock);
2289 2290
	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
		goto out_unlock;
2291

2292
	INIT_LIST_HEAD(&data->lseg_list);
2293
	pnfs_list_write_lseg(inode, &data->lseg_list);
A
Andy Adamson 已提交
2294

2295
	end_pos = nfsi->layout->plh_lwb;
A
Andy Adamson 已提交
2296

2297
	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
A
Andy Adamson 已提交
2298 2299 2300
	spin_unlock(&inode->i_lock);

	data->args.inode = inode;
2301
	data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
A
Andy Adamson 已提交
2302 2303 2304 2305 2306 2307
	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);

2308 2309 2310
	if (ld->prepare_layoutcommit) {
		status = ld->prepare_layoutcommit(&data->args);
		if (status) {
2311
			put_rpccred(data->cred);
2312
			spin_lock(&inode->i_lock);
2313 2314
			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
			if (end_pos > nfsi->layout->plh_lwb)
2315
				nfsi->layout->plh_lwb = end_pos;
2316
			goto out_unlock;
2317 2318 2319 2320
		}
	}


A
Andy Adamson 已提交
2321 2322
	status = nfs4_proc_layoutcommit(data, sync);
out:
P
Peng Tao 已提交
2323 2324
	if (status)
		mark_inode_dirty_sync(inode);
A
Andy Adamson 已提交
2325 2326
	dprintk("<-- %s status %d\n", __func__, status);
	return status;
2327 2328
out_unlock:
	spin_unlock(&inode->i_lock);
P
Peng Tao 已提交
2329
	kfree(data);
2330 2331
clear_layoutcommitting:
	pnfs_clear_layoutcommitting(inode);
P
Peng Tao 已提交
2332
	goto out;
A
Andy Adamson 已提交
2333
}
2334
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2335

2336 2337 2338 2339 2340 2341 2342
int
pnfs_generic_sync(struct inode *inode, bool datasync)
{
	return pnfs_layoutcommit_inode(inode, true);
}
EXPORT_SYMBOL_GPL(pnfs_generic_sync);

2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
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;
}
2354

2355
#if IS_ENABLED(CONFIG_NFS_V4_2)
2356
int
2357
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2358 2359 2360
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
	struct nfs_server *server = NFS_SERVER(inode);
2361
	struct nfs_inode *nfsi = NFS_I(inode);
2362 2363 2364 2365 2366 2367 2368
	struct nfs42_layoutstat_data *data;
	struct pnfs_layout_hdr *hdr;
	int status = 0;

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

2369 2370 2371
	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
		goto out;

2372 2373 2374
	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
		goto out;

2375 2376 2377 2378 2379 2380 2381 2382 2383
	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);

2384
	data = kzalloc(sizeof(*data), gfp_flags);
2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
	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);
2407 2408 2409
	smp_mb__before_atomic();
	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
	smp_mb__after_atomic();
2410 2411 2412
	goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2413
#endif
2414 2415 2416 2417

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