mirror of https://gitee.com/openkylin/linux.git
2314 lines
61 KiB
C
2314 lines
61 KiB
C
/*
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* pNFS functions to call and manage layout drivers.
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*
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* Copyright (c) 2002 [year of first publication]
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#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:
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*
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* pnfs_spinlock:
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* protects pnfs_modules_tbl.
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*/
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static DEFINE_SPINLOCK(pnfs_spinlock);
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/*
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* pnfs_modules_tbl holds all pnfs modules
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*/
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static LIST_HEAD(pnfs_modules_tbl);
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static int
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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 */
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static struct pnfs_layoutdriver_type *
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find_pnfs_driver_locked(u32 id)
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{
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struct pnfs_layoutdriver_type *local;
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list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
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if (local->id == id)
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goto out;
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local = NULL;
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out:
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dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
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return local;
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}
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static struct pnfs_layoutdriver_type *
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find_pnfs_driver(u32 id)
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{
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struct pnfs_layoutdriver_type *local;
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spin_lock(&pnfs_spinlock);
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local = find_pnfs_driver_locked(id);
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if (local != NULL && !try_module_get(local->owner)) {
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dprintk("%s: Could not grab reference on module\n", __func__);
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local = NULL;
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}
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spin_unlock(&pnfs_spinlock);
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return local;
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}
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void
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unset_pnfs_layoutdriver(struct nfs_server *nfss)
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{
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if (nfss->pnfs_curr_ld) {
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if (nfss->pnfs_curr_ld->clear_layoutdriver)
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nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
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/* Decrement the MDS count. Purge the deviceid cache if zero */
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if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
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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;
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}
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/*
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* Try to set the server's pnfs module to the pnfs layout type specified by id.
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* Currently only one pNFS layout driver per filesystem is supported.
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*
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* @id layout type. Zero (illegal layout type) indicates pNFS not in use.
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*/
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void
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set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
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u32 id)
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{
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struct pnfs_layoutdriver_type *ld_type = NULL;
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if (id == 0)
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goto out_no_driver;
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if (!(server->nfs_client->cl_exchange_flags &
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(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",
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__func__, id, server->nfs_client->cl_exchange_flags);
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goto out_no_driver;
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}
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ld_type = find_pnfs_driver(id);
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if (!ld_type) {
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request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
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ld_type = find_pnfs_driver(id);
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if (!ld_type) {
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dprintk("%s: No pNFS module found for %u.\n",
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__func__, id);
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goto out_no_driver;
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}
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}
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server->pnfs_curr_ld = ld_type;
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if (ld_type->set_layoutdriver
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&& ld_type->set_layoutdriver(server, mntfh)) {
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printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
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"driver %u.\n", __func__, id);
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module_put(ld_type->owner);
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goto out_no_driver;
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}
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/* Bump the MDS count */
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atomic_inc(&server->nfs_client->cl_mds_count);
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dprintk("%s: pNFS module for %u set\n", __func__, id);
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return;
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out_no_driver:
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dprintk("%s: Using NFSv4 I/O\n", __func__);
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server->pnfs_curr_ld = NULL;
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}
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int
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pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
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{
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int status = -EINVAL;
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struct pnfs_layoutdriver_type *tmp;
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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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}
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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__);
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return status;
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}
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spin_lock(&pnfs_spinlock);
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tmp = find_pnfs_driver_locked(ld_type->id);
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if (!tmp) {
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list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
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status = 0;
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dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
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ld_type->name);
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} 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);
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}
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spin_unlock(&pnfs_spinlock);
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return status;
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}
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EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
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void
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pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
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{
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dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
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spin_lock(&pnfs_spinlock);
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list_del(&ld_type->pnfs_tblid);
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spin_unlock(&pnfs_spinlock);
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}
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EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
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/*
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* pNFS client layout cache
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*/
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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 *
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pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
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{
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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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}
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static void
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pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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struct nfs_server *server = NFS_SERVER(lo->plh_inode);
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struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
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if (!list_empty(&lo->plh_layouts)) {
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struct nfs_client *clp = server->nfs_client;
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spin_lock(&clp->cl_lock);
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list_del_init(&lo->plh_layouts);
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spin_unlock(&clp->cl_lock);
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}
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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;
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/* Reset MDS Threshold I/O counters */
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nfsi->write_io = 0;
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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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if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
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if (!list_empty(&lo->plh_segs))
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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
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pnfs_iomode_to_fail_bit(u32 iomode)
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{
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return iomode == IOMODE_RW ?
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NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
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}
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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);
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}
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static void
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pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
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{
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if (test_and_clear_bit(fail_bit, &lo->plh_flags))
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atomic_dec(&lo->plh_refcount);
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}
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static void
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pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
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{
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struct inode *inode = lo->plh_inode;
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struct pnfs_layout_range range = {
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.iomode = iomode,
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.offset = 0,
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.length = NFS4_MAX_UINT64,
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};
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LIST_HEAD(head);
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spin_lock(&inode->i_lock);
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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__,
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iomode == IOMODE_RW ? "RW" : "READ");
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}
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static bool
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pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
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{
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unsigned long start, end;
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int fail_bit = pnfs_iomode_to_fail_bit(iomode);
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if (test_bit(fail_bit, &lo->plh_flags) == 0)
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return false;
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end = jiffies;
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start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
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if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
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/* 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;
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}
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return true;
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}
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static void
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init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
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{
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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);
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smp_mb();
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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,
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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 */
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atomic_dec(&lo->plh_refcount);
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if (list_empty(&lo->plh_segs))
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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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}
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/* Return true if layoutreturn is needed */
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static bool
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pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_layout_segment *s;
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if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
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return false;
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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;
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return true;
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}
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static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
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struct pnfs_layout_hdr *lo, struct inode *inode)
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{
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lo = lseg->pls_layout;
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inode = lo->plh_inode;
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spin_lock(&inode->i_lock);
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if (pnfs_layout_need_return(lo, lseg)) {
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nfs4_stateid stateid;
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enum pnfs_iomode iomode;
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stateid = lo->plh_stateid;
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iomode = lo->plh_return_iomode;
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/* decreased in pnfs_send_layoutreturn() */
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lo->plh_block_lgets++;
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lo->plh_return_iomode = 0;
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spin_unlock(&inode->i_lock);
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pnfs_get_layout_hdr(lo);
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/* Send an async layoutreturn so we dont deadlock */
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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;
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if (!lseg)
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return;
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dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
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atomic_read(&lseg->pls_refcount),
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test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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|
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/* Handle the case where refcount != 1 */
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if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
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return;
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lo = lseg->pls_layout;
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inode = lo->plh_inode;
|
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/* Do we need a layoutreturn? */
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if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
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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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pnfs_get_layout_hdr(lo);
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pnfs_layout_remove_lseg(lo, lseg);
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spin_unlock(&inode->i_lock);
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pnfs_free_lseg(lseg);
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pnfs_put_layout_hdr(lo);
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}
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}
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EXPORT_SYMBOL_GPL(pnfs_put_lseg);
|
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|
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static void pnfs_free_lseg_async_work(struct work_struct *work)
|
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{
|
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struct pnfs_layout_segment *lseg;
|
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struct pnfs_layout_hdr *lo;
|
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|
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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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|
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pnfs_free_lseg(lseg);
|
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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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}
|
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|
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void
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pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
|
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{
|
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if (!lseg)
|
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return;
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|
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assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
|
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|
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dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
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atomic_read(&lseg->pls_refcount),
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test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
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if (atomic_dec_and_test(&lseg->pls_refcount)) {
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struct pnfs_layout_hdr *lo = lseg->pls_layout;
|
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pnfs_get_layout_hdr(lo);
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pnfs_layout_remove_lseg(lo, lseg);
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pnfs_free_lseg_async(lseg);
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}
|
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}
|
|
EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
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|
|
|
static u64
|
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end_offset(u64 start, u64 len)
|
|
{
|
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u64 end;
|
|
|
|
end = start + len;
|
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return end >= start ? end : NFS4_MAX_UINT64;
|
|
}
|
|
|
|
/*
|
|
* is l2 fully contained in l1?
|
|
* start1 end1
|
|
* [----------------------------------)
|
|
* start2 end2
|
|
* [----------------)
|
|
*/
|
|
static bool
|
|
pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
|
|
const struct pnfs_layout_range *l2)
|
|
{
|
|
u64 start1 = l1->offset;
|
|
u64 end1 = end_offset(start1, l1->length);
|
|
u64 start2 = l2->offset;
|
|
u64 end2 = end_offset(start2, l2->length);
|
|
|
|
return (start1 <= start2) && (end1 >= end2);
|
|
}
|
|
|
|
/*
|
|
* is l1 and l2 intersecting?
|
|
* start1 end1
|
|
* [----------------------------------)
|
|
* start2 end2
|
|
* [----------------)
|
|
*/
|
|
static bool
|
|
pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
|
|
const struct pnfs_layout_range *l2)
|
|
{
|
|
u64 start1 = l1->offset;
|
|
u64 end1 = end_offset(start1, l1->length);
|
|
u64 start2 = l2->offset;
|
|
u64 end2 = end_offset(start2, l2->length);
|
|
|
|
return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
|
|
(end2 == NFS4_MAX_UINT64 || end2 > start1);
|
|
}
|
|
|
|
static bool
|
|
should_free_lseg(const struct pnfs_layout_range *lseg_range,
|
|
const struct pnfs_layout_range *recall_range)
|
|
{
|
|
return (recall_range->iomode == IOMODE_ANY ||
|
|
lseg_range->iomode == recall_range->iomode) &&
|
|
pnfs_lseg_range_intersecting(lseg_range, recall_range);
|
|
}
|
|
|
|
static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
|
|
struct list_head *tmp_list)
|
|
{
|
|
if (!atomic_dec_and_test(&lseg->pls_refcount))
|
|
return false;
|
|
pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
|
|
list_add(&lseg->pls_list, tmp_list);
|
|
return true;
|
|
}
|
|
|
|
/* Returns 1 if lseg is removed from list, 0 otherwise */
|
|
static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
|
|
struct list_head *tmp_list)
|
|
{
|
|
int rv = 0;
|
|
|
|
if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
|
|
/* Remove the reference keeping the lseg in the
|
|
* list. It will now be removed when all
|
|
* outstanding io is finished.
|
|
*/
|
|
dprintk("%s: lseg %p ref %d\n", __func__, lseg,
|
|
atomic_read(&lseg->pls_refcount));
|
|
if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
|
|
rv = 1;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
/* Returns count of number of matching invalid lsegs remaining in list
|
|
* after call.
|
|
*/
|
|
int
|
|
pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
|
|
struct list_head *tmp_list,
|
|
struct pnfs_layout_range *recall_range)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *next;
|
|
int invalid = 0, removed = 0;
|
|
|
|
dprintk("%s:Begin lo %p\n", __func__, lo);
|
|
|
|
if (list_empty(&lo->plh_segs))
|
|
return 0;
|
|
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
|
|
if (!recall_range ||
|
|
should_free_lseg(&lseg->pls_range, recall_range)) {
|
|
dprintk("%s: freeing lseg %p iomode %d "
|
|
"offset %llu length %llu\n", __func__,
|
|
lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
|
|
lseg->pls_range.length);
|
|
invalid++;
|
|
removed += mark_lseg_invalid(lseg, tmp_list);
|
|
}
|
|
dprintk("%s:Return %i\n", __func__, invalid - removed);
|
|
return invalid - removed;
|
|
}
|
|
|
|
/* note free_me must contain lsegs from a single layout_hdr */
|
|
void
|
|
pnfs_free_lseg_list(struct list_head *free_me)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
|
|
if (list_empty(free_me))
|
|
return;
|
|
|
|
list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
|
|
list_del(&lseg->pls_list);
|
|
pnfs_free_lseg(lseg);
|
|
}
|
|
}
|
|
|
|
void
|
|
pnfs_destroy_layout(struct nfs_inode *nfsi)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
spin_lock(&nfsi->vfs_inode.i_lock);
|
|
lo = nfsi->layout;
|
|
if (lo) {
|
|
lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
|
|
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
|
|
pnfs_get_layout_hdr(lo);
|
|
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
|
|
pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
|
|
pnfs_clear_retry_layoutget(lo);
|
|
spin_unlock(&nfsi->vfs_inode.i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
pnfs_put_layout_hdr(lo);
|
|
} else
|
|
spin_unlock(&nfsi->vfs_inode.i_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
|
|
|
|
static bool
|
|
pnfs_layout_add_bulk_destroy_list(struct inode *inode,
|
|
struct list_head *layout_list)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
bool ret = false;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
lo = NFS_I(inode)->layout;
|
|
if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
|
|
pnfs_get_layout_hdr(lo);
|
|
list_add(&lo->plh_bulk_destroy, layout_list);
|
|
ret = true;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* Caller must hold rcu_read_lock and clp->cl_lock */
|
|
static int
|
|
pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
|
|
struct nfs_server *server,
|
|
struct list_head *layout_list)
|
|
{
|
|
struct pnfs_layout_hdr *lo, *next;
|
|
struct inode *inode;
|
|
|
|
list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
|
|
inode = igrab(lo->plh_inode);
|
|
if (inode == NULL)
|
|
continue;
|
|
list_del_init(&lo->plh_layouts);
|
|
if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
|
|
continue;
|
|
rcu_read_unlock();
|
|
spin_unlock(&clp->cl_lock);
|
|
iput(inode);
|
|
spin_lock(&clp->cl_lock);
|
|
rcu_read_lock();
|
|
return -EAGAIN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
|
|
bool is_bulk_recall)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
struct inode *inode;
|
|
struct pnfs_layout_range range = {
|
|
.iomode = IOMODE_ANY,
|
|
.offset = 0,
|
|
.length = NFS4_MAX_UINT64,
|
|
};
|
|
LIST_HEAD(lseg_list);
|
|
int ret = 0;
|
|
|
|
while (!list_empty(layout_list)) {
|
|
lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
|
|
plh_bulk_destroy);
|
|
dprintk("%s freeing layout for inode %lu\n", __func__,
|
|
lo->plh_inode->i_ino);
|
|
inode = lo->plh_inode;
|
|
|
|
pnfs_layoutcommit_inode(inode, false);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_del_init(&lo->plh_bulk_destroy);
|
|
lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
|
|
if (is_bulk_recall)
|
|
set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
|
|
if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
|
|
ret = -EAGAIN;
|
|
spin_unlock(&inode->i_lock);
|
|
pnfs_free_lseg_list(&lseg_list);
|
|
pnfs_put_layout_hdr(lo);
|
|
iput(inode);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
|
|
struct nfs_fsid *fsid,
|
|
bool is_recall)
|
|
{
|
|
struct nfs_server *server;
|
|
LIST_HEAD(layout_list);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
rcu_read_lock();
|
|
restart:
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
|
|
continue;
|
|
if (pnfs_layout_bulk_destroy_byserver_locked(clp,
|
|
server,
|
|
&layout_list) != 0)
|
|
goto restart;
|
|
}
|
|
rcu_read_unlock();
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
if (list_empty(&layout_list))
|
|
return 0;
|
|
return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
|
|
}
|
|
|
|
int
|
|
pnfs_destroy_layouts_byclid(struct nfs_client *clp,
|
|
bool is_recall)
|
|
{
|
|
struct nfs_server *server;
|
|
LIST_HEAD(layout_list);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
rcu_read_lock();
|
|
restart:
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
if (pnfs_layout_bulk_destroy_byserver_locked(clp,
|
|
server,
|
|
&layout_list) != 0)
|
|
goto restart;
|
|
}
|
|
rcu_read_unlock();
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
if (list_empty(&layout_list))
|
|
return 0;
|
|
return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
|
|
}
|
|
|
|
/*
|
|
* Called by the state manger to remove all layouts established under an
|
|
* expired lease.
|
|
*/
|
|
void
|
|
pnfs_destroy_all_layouts(struct nfs_client *clp)
|
|
{
|
|
nfs4_deviceid_mark_client_invalid(clp);
|
|
nfs4_deviceid_purge_client(clp);
|
|
|
|
pnfs_destroy_layouts_byclid(clp, false);
|
|
}
|
|
|
|
/*
|
|
* Compare 2 layout stateid sequence ids, to see which is newer,
|
|
* taking into account wraparound issues.
|
|
*/
|
|
static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
|
|
{
|
|
return (s32)(s1 - s2) > 0;
|
|
}
|
|
|
|
/* update lo->plh_stateid with new if is more recent */
|
|
void
|
|
pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
|
|
bool update_barrier)
|
|
{
|
|
u32 oldseq, newseq, new_barrier;
|
|
int empty = list_empty(&lo->plh_segs);
|
|
|
|
oldseq = be32_to_cpu(lo->plh_stateid.seqid);
|
|
newseq = be32_to_cpu(new->seqid);
|
|
if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
|
|
nfs4_stateid_copy(&lo->plh_stateid, new);
|
|
if (update_barrier) {
|
|
new_barrier = be32_to_cpu(new->seqid);
|
|
} else {
|
|
/* Because of wraparound, we want to keep the barrier
|
|
* "close" to the current seqids.
|
|
*/
|
|
new_barrier = newseq - atomic_read(&lo->plh_outstanding);
|
|
}
|
|
if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
|
|
lo->plh_barrier = new_barrier;
|
|
}
|
|
}
|
|
|
|
static bool
|
|
pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
u32 seqid = be32_to_cpu(stateid->seqid);
|
|
|
|
return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
|
|
}
|
|
|
|
static bool
|
|
pnfs_layout_returning(const struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_range *range)
|
|
{
|
|
return test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
|
|
(lo->plh_return_iomode == IOMODE_ANY ||
|
|
lo->plh_return_iomode == range->iomode);
|
|
}
|
|
|
|
/* lget is set to 1 if called from inside send_layoutget call chain */
|
|
static bool
|
|
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_range *range, int lget)
|
|
{
|
|
return lo->plh_block_lgets ||
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
|
|
(list_empty(&lo->plh_segs) &&
|
|
(atomic_read(&lo->plh_outstanding) > lget)) ||
|
|
pnfs_layout_returning(lo, range);
|
|
}
|
|
|
|
int
|
|
pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_range *range,
|
|
struct nfs4_state *open_state)
|
|
{
|
|
int status = 0;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
spin_lock(&lo->plh_inode->i_lock);
|
|
if (pnfs_layoutgets_blocked(lo, range, 1)) {
|
|
status = -EAGAIN;
|
|
} else if (!nfs4_valid_open_stateid(open_state)) {
|
|
status = -EBADF;
|
|
} else if (list_empty(&lo->plh_segs) ||
|
|
test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
|
|
int seq;
|
|
|
|
do {
|
|
seq = read_seqbegin(&open_state->seqlock);
|
|
nfs4_stateid_copy(dst, &open_state->stateid);
|
|
} while (read_seqretry(&open_state->seqlock, seq));
|
|
} else
|
|
nfs4_stateid_copy(dst, &lo->plh_stateid);
|
|
spin_unlock(&lo->plh_inode->i_lock);
|
|
dprintk("<-- %s\n", __func__);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Get layout from server.
|
|
* for now, assume that whole file layouts are requested.
|
|
* arg->offset: 0
|
|
* arg->length: all ones
|
|
*/
|
|
static struct pnfs_layout_segment *
|
|
send_layoutget(struct pnfs_layout_hdr *lo,
|
|
struct nfs_open_context *ctx,
|
|
struct pnfs_layout_range *range,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct inode *ino = lo->plh_inode;
|
|
struct nfs_server *server = NFS_SERVER(ino);
|
|
struct nfs4_layoutget *lgp;
|
|
struct pnfs_layout_segment *lseg;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
|
|
lgp = kzalloc(sizeof(*lgp), gfp_flags);
|
|
if (lgp == NULL)
|
|
return NULL;
|
|
|
|
lgp->args.minlength = PAGE_CACHE_SIZE;
|
|
if (lgp->args.minlength > range->length)
|
|
lgp->args.minlength = range->length;
|
|
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;
|
|
|
|
/* Synchronously retrieve layout information from server and
|
|
* store in lseg.
|
|
*/
|
|
lseg = nfs4_proc_layoutget(lgp, gfp_flags);
|
|
if (IS_ERR(lseg)) {
|
|
switch (PTR_ERR(lseg)) {
|
|
case -ENOMEM:
|
|
case -ERESTARTSYS:
|
|
break;
|
|
default:
|
|
/* remember that LAYOUTGET failed and suspend trying */
|
|
pnfs_layout_io_set_failed(lo, range->iomode);
|
|
}
|
|
return NULL;
|
|
} else
|
|
pnfs_layout_clear_fail_bit(lo,
|
|
pnfs_iomode_to_fail_bit(range->iomode));
|
|
|
|
return lseg;
|
|
}
|
|
|
|
static void pnfs_clear_layoutcommit(struct inode *inode,
|
|
struct list_head *head)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
|
|
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
|
|
return;
|
|
list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
|
|
if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
|
|
continue;
|
|
pnfs_lseg_dec_and_remove_zero(lseg, head);
|
|
}
|
|
}
|
|
|
|
void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
|
|
{
|
|
clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
|
|
}
|
|
|
|
static int
|
|
pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
|
|
enum pnfs_iomode iomode, bool sync)
|
|
{
|
|
struct inode *ino = lo->plh_inode;
|
|
struct nfs4_layoutreturn *lrp;
|
|
int status = 0;
|
|
|
|
lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
|
|
if (unlikely(lrp == NULL)) {
|
|
status = -ENOMEM;
|
|
spin_lock(&ino->i_lock);
|
|
lo->plh_block_lgets--;
|
|
pnfs_clear_layoutreturn_waitbit(lo);
|
|
rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq);
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_put_layout_hdr(lo);
|
|
goto out;
|
|
}
|
|
|
|
lrp->args.stateid = stateid;
|
|
lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
|
|
lrp->args.inode = ino;
|
|
lrp->args.range.iomode = iomode;
|
|
lrp->args.range.offset = 0;
|
|
lrp->args.range.length = NFS4_MAX_UINT64;
|
|
lrp->args.layout = lo;
|
|
lrp->clp = NFS_SERVER(ino)->nfs_client;
|
|
lrp->cred = lo->plh_lc_cred;
|
|
|
|
status = nfs4_proc_layoutreturn(lrp, sync);
|
|
out:
|
|
dprintk("<-- %s status: %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
|
|
* when the layout segment list is empty.
|
|
*
|
|
* Note that a pnfs_layout_hdr can exist with an empty layout segment
|
|
* list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
|
|
* deviceid is marked invalid.
|
|
*/
|
|
int
|
|
_pnfs_return_layout(struct inode *ino)
|
|
{
|
|
struct pnfs_layout_hdr *lo = NULL;
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
LIST_HEAD(tmp_list);
|
|
nfs4_stateid stateid;
|
|
int status = 0, empty;
|
|
|
|
dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = nfsi->layout;
|
|
if (!lo) {
|
|
spin_unlock(&ino->i_lock);
|
|
dprintk("NFS: %s no layout to return\n", __func__);
|
|
goto out;
|
|
}
|
|
stateid = nfsi->layout->plh_stateid;
|
|
/* Reference matched in nfs4_layoutreturn_release */
|
|
pnfs_get_layout_hdr(lo);
|
|
empty = list_empty(&lo->plh_segs);
|
|
pnfs_clear_layoutcommit(ino, &tmp_list);
|
|
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
|
|
|
|
if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
|
|
struct pnfs_layout_range range = {
|
|
.iomode = IOMODE_ANY,
|
|
.offset = 0,
|
|
.length = NFS4_MAX_UINT64,
|
|
};
|
|
NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
|
|
}
|
|
|
|
/* Don't send a LAYOUTRETURN if list was initially empty */
|
|
if (empty) {
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_put_layout_hdr(lo);
|
|
dprintk("NFS: %s no layout segments to return\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
|
|
lo->plh_block_lgets++;
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
|
|
status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
|
|
out:
|
|
dprintk("<-- %s status: %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
|
|
|
|
int
|
|
pnfs_commit_and_return_layout(struct inode *inode)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
int ret;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
lo = NFS_I(inode)->layout;
|
|
if (lo == NULL) {
|
|
spin_unlock(&inode->i_lock);
|
|
return 0;
|
|
}
|
|
pnfs_get_layout_hdr(lo);
|
|
/* Block new layoutgets and read/write to ds */
|
|
lo->plh_block_lgets++;
|
|
spin_unlock(&inode->i_lock);
|
|
filemap_fdatawait(inode->i_mapping);
|
|
ret = pnfs_layoutcommit_inode(inode, true);
|
|
if (ret == 0)
|
|
ret = _pnfs_return_layout(inode);
|
|
spin_lock(&inode->i_lock);
|
|
lo->plh_block_lgets--;
|
|
spin_unlock(&inode->i_lock);
|
|
pnfs_put_layout_hdr(lo);
|
|
return ret;
|
|
}
|
|
|
|
bool pnfs_roc(struct inode *ino)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
struct nfs_open_context *ctx;
|
|
struct nfs4_state *state;
|
|
struct pnfs_layout_hdr *lo;
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
nfs4_stateid stateid;
|
|
LIST_HEAD(tmp_list);
|
|
bool found = false, layoutreturn = false;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = nfsi->layout;
|
|
if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
|
|
goto out_noroc;
|
|
|
|
/* Don't return layout if we hold a delegation */
|
|
if (nfs4_check_delegation(ino, FMODE_READ))
|
|
goto out_noroc;
|
|
|
|
list_for_each_entry(ctx, &nfsi->open_files, list) {
|
|
state = ctx->state;
|
|
/* Don't return layout if there is open file state */
|
|
if (state != NULL && state->state != 0)
|
|
goto out_noroc;
|
|
}
|
|
|
|
pnfs_clear_retry_layoutget(lo);
|
|
list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
|
|
if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
|
|
mark_lseg_invalid(lseg, &tmp_list);
|
|
found = true;
|
|
}
|
|
if (!found)
|
|
goto out_noroc;
|
|
lo->plh_block_lgets++;
|
|
pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
pnfs_layoutcommit_inode(ino, true);
|
|
return true;
|
|
|
|
out_noroc:
|
|
if (lo) {
|
|
stateid = lo->plh_stateid;
|
|
layoutreturn =
|
|
test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
|
|
&lo->plh_flags);
|
|
if (layoutreturn) {
|
|
lo->plh_block_lgets++;
|
|
pnfs_get_layout_hdr(lo);
|
|
}
|
|
}
|
|
spin_unlock(&ino->i_lock);
|
|
if (layoutreturn) {
|
|
pnfs_layoutcommit_inode(ino, true);
|
|
pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void pnfs_roc_release(struct inode *ino)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = NFS_I(ino)->layout;
|
|
lo->plh_block_lgets--;
|
|
if (atomic_dec_and_test(&lo->plh_refcount)) {
|
|
pnfs_detach_layout_hdr(lo);
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_layout_hdr(lo);
|
|
} else
|
|
spin_unlock(&ino->i_lock);
|
|
}
|
|
|
|
void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = NFS_I(ino)->layout;
|
|
if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
|
|
lo->plh_barrier = barrier;
|
|
spin_unlock(&ino->i_lock);
|
|
}
|
|
|
|
bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
struct pnfs_layout_hdr *lo;
|
|
struct pnfs_layout_segment *lseg;
|
|
nfs4_stateid stateid;
|
|
u32 current_seqid;
|
|
bool found = false, layoutreturn = false;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
|
|
if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
|
|
rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
|
|
found = true;
|
|
goto out;
|
|
}
|
|
lo = nfsi->layout;
|
|
current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
|
|
|
|
/* Since close does not return a layout stateid for use as
|
|
* a barrier, we choose the worst-case barrier.
|
|
*/
|
|
*barrier = current_seqid + atomic_read(&lo->plh_outstanding);
|
|
out:
|
|
if (!found) {
|
|
stateid = lo->plh_stateid;
|
|
layoutreturn =
|
|
test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
|
|
&lo->plh_flags);
|
|
if (layoutreturn) {
|
|
lo->plh_block_lgets++;
|
|
pnfs_get_layout_hdr(lo);
|
|
}
|
|
}
|
|
spin_unlock(&ino->i_lock);
|
|
if (layoutreturn) {
|
|
rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
|
|
pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, false);
|
|
}
|
|
return found;
|
|
}
|
|
|
|
/*
|
|
* Compare two layout segments for sorting into layout cache.
|
|
* We want to preferentially return RW over RO layouts, so ensure those
|
|
* are seen first.
|
|
*/
|
|
static s64
|
|
pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
|
|
const struct pnfs_layout_range *l2)
|
|
{
|
|
s64 d;
|
|
|
|
/* high offset > low offset */
|
|
d = l1->offset - l2->offset;
|
|
if (d)
|
|
return d;
|
|
|
|
/* short length > long length */
|
|
d = l2->length - l1->length;
|
|
if (d)
|
|
return d;
|
|
|
|
/* read > read/write */
|
|
return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
|
|
}
|
|
|
|
static void
|
|
pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_segment *lseg)
|
|
{
|
|
struct pnfs_layout_segment *lp;
|
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
list_for_each_entry(lp, &lo->plh_segs, pls_list) {
|
|
if (pnfs_lseg_range_cmp(&lseg->pls_range, &lp->pls_range) > 0)
|
|
continue;
|
|
list_add_tail(&lseg->pls_list, &lp->pls_list);
|
|
dprintk("%s: inserted lseg %p "
|
|
"iomode %d offset %llu length %llu before "
|
|
"lp %p iomode %d offset %llu length %llu\n",
|
|
__func__, lseg, lseg->pls_range.iomode,
|
|
lseg->pls_range.offset, lseg->pls_range.length,
|
|
lp, lp->pls_range.iomode, lp->pls_range.offset,
|
|
lp->pls_range.length);
|
|
goto out;
|
|
}
|
|
list_add_tail(&lseg->pls_list, &lo->plh_segs);
|
|
dprintk("%s: inserted lseg %p "
|
|
"iomode %d offset %llu length %llu at tail\n",
|
|
__func__, lseg, lseg->pls_range.iomode,
|
|
lseg->pls_range.offset, lseg->pls_range.length);
|
|
out:
|
|
pnfs_get_layout_hdr(lo);
|
|
|
|
dprintk("%s:Return\n", __func__);
|
|
}
|
|
|
|
static struct pnfs_layout_hdr *
|
|
alloc_init_layout_hdr(struct inode *ino,
|
|
struct nfs_open_context *ctx,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
|
|
lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
|
|
if (!lo)
|
|
return NULL;
|
|
atomic_set(&lo->plh_refcount, 1);
|
|
INIT_LIST_HEAD(&lo->plh_layouts);
|
|
INIT_LIST_HEAD(&lo->plh_segs);
|
|
INIT_LIST_HEAD(&lo->plh_bulk_destroy);
|
|
lo->plh_inode = ino;
|
|
lo->plh_lc_cred = get_rpccred(ctx->cred);
|
|
return lo;
|
|
}
|
|
|
|
static struct pnfs_layout_hdr *
|
|
pnfs_find_alloc_layout(struct inode *ino,
|
|
struct nfs_open_context *ctx,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
struct pnfs_layout_hdr *new = NULL;
|
|
|
|
dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
|
|
|
|
if (nfsi->layout != NULL)
|
|
goto out_existing;
|
|
spin_unlock(&ino->i_lock);
|
|
new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
|
|
spin_lock(&ino->i_lock);
|
|
|
|
if (likely(nfsi->layout == NULL)) { /* Won the race? */
|
|
nfsi->layout = new;
|
|
return new;
|
|
} else if (new != NULL)
|
|
pnfs_free_layout_hdr(new);
|
|
out_existing:
|
|
pnfs_get_layout_hdr(nfsi->layout);
|
|
return nfsi->layout;
|
|
}
|
|
|
|
/*
|
|
* iomode matching rules:
|
|
* iomode lseg match
|
|
* ----- ----- -----
|
|
* ANY READ true
|
|
* ANY RW true
|
|
* RW READ false
|
|
* RW RW true
|
|
* READ READ true
|
|
* READ RW true
|
|
*/
|
|
static bool
|
|
pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
|
|
const struct pnfs_layout_range *range)
|
|
{
|
|
struct pnfs_layout_range range1;
|
|
|
|
if ((range->iomode == IOMODE_RW &&
|
|
ls_range->iomode != IOMODE_RW) ||
|
|
!pnfs_lseg_range_intersecting(ls_range, range))
|
|
return 0;
|
|
|
|
/* range1 covers only the first byte in the range */
|
|
range1 = *range;
|
|
range1.length = 1;
|
|
return pnfs_lseg_range_contained(ls_range, &range1);
|
|
}
|
|
|
|
/*
|
|
* lookup range in layout
|
|
*/
|
|
static struct pnfs_layout_segment *
|
|
pnfs_find_lseg(struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_range *range)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *ret = NULL;
|
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
|
|
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
|
|
!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
|
|
pnfs_lseg_range_match(&lseg->pls_range, range)) {
|
|
ret = pnfs_get_lseg(lseg);
|
|
break;
|
|
}
|
|
if (lseg->pls_range.offset > range->offset)
|
|
break;
|
|
}
|
|
|
|
dprintk("%s:Return lseg %p ref %d\n",
|
|
__func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Use mdsthreshold hints set at each OPEN to determine if I/O should go
|
|
* to the MDS or over pNFS
|
|
*
|
|
* The nfs_inode read_io and write_io fields are cumulative counters reset
|
|
* when there are no layout segments. Note that in pnfs_update_layout iomode
|
|
* is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
|
|
* WRITE request.
|
|
*
|
|
* A return of true means use MDS I/O.
|
|
*
|
|
* From rfc 5661:
|
|
* If a file's size is smaller than the file size threshold, data accesses
|
|
* SHOULD be sent to the metadata server. If an I/O request has a length that
|
|
* is below the I/O size threshold, the I/O SHOULD be sent to the metadata
|
|
* server. If both file size and I/O size are provided, the client SHOULD
|
|
* reach or exceed both thresholds before sending its read or write
|
|
* requests to the data server.
|
|
*/
|
|
static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
|
|
struct inode *ino, int iomode)
|
|
{
|
|
struct nfs4_threshold *t = ctx->mdsthreshold;
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
loff_t fsize = i_size_read(ino);
|
|
bool size = false, size_set = false, io = false, io_set = false, ret = false;
|
|
|
|
if (t == NULL)
|
|
return ret;
|
|
|
|
dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
|
|
__func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
|
|
|
|
switch (iomode) {
|
|
case IOMODE_READ:
|
|
if (t->bm & THRESHOLD_RD) {
|
|
dprintk("%s fsize %llu\n", __func__, fsize);
|
|
size_set = true;
|
|
if (fsize < t->rd_sz)
|
|
size = true;
|
|
}
|
|
if (t->bm & THRESHOLD_RD_IO) {
|
|
dprintk("%s nfsi->read_io %llu\n", __func__,
|
|
nfsi->read_io);
|
|
io_set = true;
|
|
if (nfsi->read_io < t->rd_io_sz)
|
|
io = true;
|
|
}
|
|
break;
|
|
case IOMODE_RW:
|
|
if (t->bm & THRESHOLD_WR) {
|
|
dprintk("%s fsize %llu\n", __func__, fsize);
|
|
size_set = true;
|
|
if (fsize < t->wr_sz)
|
|
size = true;
|
|
}
|
|
if (t->bm & THRESHOLD_WR_IO) {
|
|
dprintk("%s nfsi->write_io %llu\n", __func__,
|
|
nfsi->write_io);
|
|
io_set = true;
|
|
if (nfsi->write_io < t->wr_io_sz)
|
|
io = true;
|
|
}
|
|
break;
|
|
}
|
|
if (size_set && io_set) {
|
|
if (size && io)
|
|
ret = true;
|
|
} else if (size || io)
|
|
ret = true;
|
|
|
|
dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
|
|
static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key)
|
|
{
|
|
if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
|
|
return 1;
|
|
return nfs_wait_bit_killable(key);
|
|
}
|
|
|
|
static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
|
|
{
|
|
/*
|
|
* send layoutcommit as it can hold up layoutreturn due to lseg
|
|
* reference
|
|
*/
|
|
pnfs_layoutcommit_inode(lo->plh_inode, false);
|
|
return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
|
|
pnfs_layoutget_retry_bit_wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
|
|
{
|
|
unsigned long *bitlock = &lo->plh_flags;
|
|
|
|
clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
|
|
}
|
|
|
|
/*
|
|
* Layout segment is retreived from the server if not cached.
|
|
* The appropriate layout segment is referenced and returned to the caller.
|
|
*/
|
|
struct pnfs_layout_segment *
|
|
pnfs_update_layout(struct inode *ino,
|
|
struct nfs_open_context *ctx,
|
|
loff_t pos,
|
|
u64 count,
|
|
enum pnfs_iomode iomode,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct pnfs_layout_range arg = {
|
|
.iomode = iomode,
|
|
.offset = pos,
|
|
.length = count,
|
|
};
|
|
unsigned pg_offset;
|
|
struct nfs_server *server = NFS_SERVER(ino);
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct pnfs_layout_hdr *lo;
|
|
struct pnfs_layout_segment *lseg = NULL;
|
|
bool first;
|
|
|
|
if (!pnfs_enabled_sb(NFS_SERVER(ino)))
|
|
goto out;
|
|
|
|
if (pnfs_within_mdsthreshold(ctx, ino, iomode))
|
|
goto out;
|
|
|
|
lookup_again:
|
|
first = false;
|
|
spin_lock(&ino->i_lock);
|
|
lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
|
|
if (lo == NULL) {
|
|
spin_unlock(&ino->i_lock);
|
|
goto out;
|
|
}
|
|
|
|
/* Do we even need to bother with this? */
|
|
if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
|
|
dprintk("%s matches recall, use MDS\n", __func__);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* if LAYOUTGET already failed once we don't try again */
|
|
if (pnfs_layout_io_test_failed(lo, iomode) &&
|
|
!pnfs_should_retry_layoutget(lo))
|
|
goto out_unlock;
|
|
|
|
first = list_empty(&lo->plh_segs);
|
|
if (first) {
|
|
/* The first layoutget for the file. Need to serialize per
|
|
* RFC 5661 Errata 3208.
|
|
*/
|
|
if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
|
|
&lo->plh_flags)) {
|
|
spin_unlock(&ino->i_lock);
|
|
wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
|
|
TASK_UNINTERRUPTIBLE);
|
|
pnfs_put_layout_hdr(lo);
|
|
goto lookup_again;
|
|
}
|
|
} else {
|
|
/* Check to see if the layout for the given range
|
|
* already exists
|
|
*/
|
|
lseg = pnfs_find_lseg(lo, &arg);
|
|
if (lseg)
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* Because we free lsegs before sending LAYOUTRETURN, we need to wait
|
|
* for LAYOUTRETURN even if first is true.
|
|
*/
|
|
if (!lseg && pnfs_should_retry_layoutget(lo) &&
|
|
test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
|
|
spin_unlock(&ino->i_lock);
|
|
dprintk("%s wait for layoutreturn\n", __func__);
|
|
if (pnfs_prepare_to_retry_layoutget(lo)) {
|
|
if (first)
|
|
pnfs_clear_first_layoutget(lo);
|
|
pnfs_put_layout_hdr(lo);
|
|
dprintk("%s retrying\n", __func__);
|
|
goto lookup_again;
|
|
}
|
|
goto out_put_layout_hdr;
|
|
}
|
|
|
|
if (pnfs_layoutgets_blocked(lo, &arg, 0))
|
|
goto out_unlock;
|
|
atomic_inc(&lo->plh_outstanding);
|
|
spin_unlock(&ino->i_lock);
|
|
|
|
if (list_empty(&lo->plh_layouts)) {
|
|
/* The lo must be on the clp list if there is any
|
|
* chance of a CB_LAYOUTRECALL(FILE) coming in.
|
|
*/
|
|
spin_lock(&clp->cl_lock);
|
|
if (list_empty(&lo->plh_layouts))
|
|
list_add_tail(&lo->plh_layouts, &server->layouts);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
pg_offset = arg.offset & ~PAGE_CACHE_MASK;
|
|
if (pg_offset) {
|
|
arg.offset -= pg_offset;
|
|
arg.length += pg_offset;
|
|
}
|
|
if (arg.length != NFS4_MAX_UINT64)
|
|
arg.length = PAGE_CACHE_ALIGN(arg.length);
|
|
|
|
lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
|
|
pnfs_clear_retry_layoutget(lo);
|
|
atomic_dec(&lo->plh_outstanding);
|
|
out_put_layout_hdr:
|
|
if (first)
|
|
pnfs_clear_first_layoutget(lo);
|
|
pnfs_put_layout_hdr(lo);
|
|
out:
|
|
dprintk("%s: inode %s/%llu pNFS layout segment %s for "
|
|
"(%s, offset: %llu, length: %llu)\n",
|
|
__func__, ino->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(ino),
|
|
lseg == NULL ? "not found" : "found",
|
|
iomode==IOMODE_RW ? "read/write" : "read-only",
|
|
(unsigned long long)pos,
|
|
(unsigned long long)count);
|
|
return lseg;
|
|
out_unlock:
|
|
spin_unlock(&ino->i_lock);
|
|
goto out_put_layout_hdr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_update_layout);
|
|
|
|
struct pnfs_layout_segment *
|
|
pnfs_layout_process(struct nfs4_layoutget *lgp)
|
|
{
|
|
struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
|
|
struct nfs4_layoutget_res *res = &lgp->res;
|
|
struct pnfs_layout_segment *lseg;
|
|
struct inode *ino = lo->plh_inode;
|
|
LIST_HEAD(free_me);
|
|
int status = 0;
|
|
|
|
/* Inject layout blob into I/O device driver */
|
|
lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
|
|
if (!lseg || IS_ERR(lseg)) {
|
|
if (!lseg)
|
|
status = -ENOMEM;
|
|
else
|
|
status = PTR_ERR(lseg);
|
|
dprintk("%s: Could not allocate layout: error %d\n",
|
|
__func__, status);
|
|
goto out;
|
|
}
|
|
|
|
init_lseg(lo, lseg);
|
|
lseg->pls_range = res->range;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
|
|
dprintk("%s forget reply due to recall\n", __func__);
|
|
goto out_forget_reply;
|
|
}
|
|
|
|
if (pnfs_layoutgets_blocked(lo, &lgp->args.range, 1)) {
|
|
dprintk("%s forget reply due to state\n", __func__);
|
|
goto out_forget_reply;
|
|
}
|
|
|
|
if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
|
|
/* existing state ID, make sure the sequence number matches. */
|
|
if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
|
|
dprintk("%s forget reply due to sequence\n", __func__);
|
|
goto out_forget_reply;
|
|
}
|
|
pnfs_set_layout_stateid(lo, &res->stateid, false);
|
|
} else {
|
|
/*
|
|
* We got an entirely new state ID. Mark all segments for the
|
|
* inode invalid, and don't bother validating the stateid
|
|
* sequence number.
|
|
*/
|
|
pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
|
|
|
|
nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
|
|
lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
|
|
}
|
|
|
|
clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
|
|
|
|
pnfs_get_lseg(lseg);
|
|
pnfs_layout_insert_lseg(lo, lseg);
|
|
|
|
if (res->return_on_close) {
|
|
set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
|
|
set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
|
|
}
|
|
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_lseg_list(&free_me);
|
|
return lseg;
|
|
out:
|
|
return ERR_PTR(status);
|
|
|
|
out_forget_reply:
|
|
spin_unlock(&ino->i_lock);
|
|
lseg->pls_layout = lo;
|
|
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
|
|
if (lo->plh_return_iomode == 0)
|
|
lo->plh_return_iomode = range.iomode;
|
|
else if (lo->plh_return_iomode != range.iomode)
|
|
lo->plh_return_iomode = IOMODE_ANY;
|
|
/*
|
|
* mark all matching lsegs so that we are sure to have no live
|
|
* segments at hand when sending layoutreturn. See pnfs_put_lseg()
|
|
* for how it works.
|
|
*/
|
|
pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
|
|
spin_unlock(&inode->i_lock);
|
|
pnfs_free_lseg_list(&free_me);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
|
|
|
|
void
|
|
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
|
{
|
|
u64 rd_size = req->wb_bytes;
|
|
|
|
if (pgio->pg_lseg == NULL) {
|
|
if (pgio->pg_dreq == NULL)
|
|
rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
|
|
else
|
|
rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
|
|
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
req_offset(req),
|
|
rd_size,
|
|
IOMODE_READ,
|
|
GFP_KERNEL);
|
|
}
|
|
/* If no lseg, fall back to read through mds */
|
|
if (pgio->pg_lseg == NULL)
|
|
nfs_pageio_reset_read_mds(pgio);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
|
|
|
|
void
|
|
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
|
|
struct nfs_page *req, u64 wb_size)
|
|
{
|
|
if (pgio->pg_lseg == NULL)
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
req_offset(req),
|
|
wb_size,
|
|
IOMODE_RW,
|
|
GFP_NOFS);
|
|
/* If no lseg, fall back to write through mds */
|
|
if (pgio->pg_lseg == NULL)
|
|
nfs_pageio_reset_write_mds(pgio);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
|
|
|
|
void
|
|
pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
if (desc->pg_lseg) {
|
|
pnfs_put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
|
|
|
|
/*
|
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
|
|
* of bytes (maximum @req->wb_bytes) that can be coalesced.
|
|
*/
|
|
size_t
|
|
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
|
|
struct nfs_page *prev, struct nfs_page *req)
|
|
{
|
|
unsigned int size;
|
|
u64 seg_end, req_start, seg_left;
|
|
|
|
size = nfs_generic_pg_test(pgio, prev, req);
|
|
if (!size)
|
|
return 0;
|
|
|
|
/*
|
|
* 'size' contains the number of bytes left in the current page (up
|
|
* to the original size asked for in @req->wb_bytes).
|
|
*
|
|
* Calculate how many bytes are left in the layout segment
|
|
* and if there are less bytes than 'size', return that instead.
|
|
*
|
|
* Please also note that 'end_offset' is actually the offset of the
|
|
* first byte that lies outside the pnfs_layout_range. FIXME?
|
|
*
|
|
*/
|
|
if (pgio->pg_lseg) {
|
|
seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
|
|
pgio->pg_lseg->pls_range.length);
|
|
req_start = req_offset(req);
|
|
WARN_ON_ONCE(req_start >= seg_end);
|
|
/* start of request is past the last byte of this segment */
|
|
if (req_start >= seg_end) {
|
|
/* reference the new lseg */
|
|
if (pgio->pg_ops->pg_cleanup)
|
|
pgio->pg_ops->pg_cleanup(pgio);
|
|
if (pgio->pg_ops->pg_init)
|
|
pgio->pg_ops->pg_init(pgio, req);
|
|
return 0;
|
|
}
|
|
|
|
/* adjust 'size' iff there are fewer bytes left in the
|
|
* segment than what nfs_generic_pg_test returned */
|
|
seg_left = seg_end - req_start;
|
|
if (seg_left < size)
|
|
size = (unsigned int)seg_left;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
|
|
|
|
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
|
|
hdr->completion_ops);
|
|
set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
|
|
return nfs_pageio_resend(&pgio, hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
|
|
|
|
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
|
|
{
|
|
|
|
dprintk("pnfs write error = %d\n", hdr->pnfs_error);
|
|
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
|
|
PNFS_LAYOUTRET_ON_ERROR) {
|
|
pnfs_return_layout(hdr->inode);
|
|
}
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
|
|
hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
|
|
}
|
|
|
|
/*
|
|
* Called by non rpc-based layout drivers
|
|
*/
|
|
void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
|
|
{
|
|
trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
|
|
if (!hdr->pnfs_error) {
|
|
pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
|
|
hdr->mds_offset + hdr->res.count);
|
|
hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
|
|
} else
|
|
pnfs_ld_handle_write_error(hdr);
|
|
hdr->mds_ops->rpc_release(hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
|
|
|
|
static void
|
|
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
|
|
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
|
|
nfs_pageio_reset_write_mds(desc);
|
|
mirror->pg_recoalesce = 1;
|
|
}
|
|
nfs_pgio_data_destroy(hdr);
|
|
hdr->release(hdr);
|
|
}
|
|
|
|
static enum pnfs_try_status
|
|
pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
|
|
const struct rpc_call_ops *call_ops,
|
|
struct pnfs_layout_segment *lseg,
|
|
int how)
|
|
{
|
|
struct inode *inode = hdr->inode;
|
|
enum pnfs_try_status trypnfs;
|
|
struct nfs_server *nfss = NFS_SERVER(inode);
|
|
|
|
hdr->mds_ops = call_ops;
|
|
|
|
dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
|
|
inode->i_ino, hdr->args.count, hdr->args.offset, how);
|
|
trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
|
|
if (trypnfs != PNFS_NOT_ATTEMPTED)
|
|
nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
|
|
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
|
|
return trypnfs;
|
|
}
|
|
|
|
static void
|
|
pnfs_do_write(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr, int how)
|
|
{
|
|
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
|
|
struct pnfs_layout_segment *lseg = desc->pg_lseg;
|
|
enum pnfs_try_status trypnfs;
|
|
|
|
trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED)
|
|
pnfs_write_through_mds(desc, hdr);
|
|
}
|
|
|
|
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
|
|
{
|
|
pnfs_put_lseg(hdr->lseg);
|
|
nfs_pgio_header_free(hdr);
|
|
}
|
|
|
|
int
|
|
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
|
|
if (!hdr) {
|
|
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
|
|
return -ENOMEM;
|
|
}
|
|
nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
|
|
|
|
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
|
|
ret = nfs_generic_pgio(desc, hdr);
|
|
if (!ret)
|
|
pnfs_do_write(desc, hdr, desc->pg_ioflags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
|
|
|
|
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
|
|
return nfs_pageio_resend(&pgio, hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
|
|
|
|
static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
|
|
{
|
|
dprintk("pnfs read error = %d\n", hdr->pnfs_error);
|
|
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
|
|
PNFS_LAYOUTRET_ON_ERROR) {
|
|
pnfs_return_layout(hdr->inode);
|
|
}
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
|
|
hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
|
|
}
|
|
|
|
/*
|
|
* Called by non rpc-based layout drivers
|
|
*/
|
|
void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
|
|
{
|
|
trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
|
|
if (likely(!hdr->pnfs_error)) {
|
|
__nfs4_read_done_cb(hdr);
|
|
hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
|
|
} else
|
|
pnfs_ld_handle_read_error(hdr);
|
|
hdr->mds_ops->rpc_release(hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
|
|
|
|
static void
|
|
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
|
|
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
|
|
nfs_pageio_reset_read_mds(desc);
|
|
mirror->pg_recoalesce = 1;
|
|
}
|
|
nfs_pgio_data_destroy(hdr);
|
|
hdr->release(hdr);
|
|
}
|
|
|
|
/*
|
|
* Call the appropriate parallel I/O subsystem read function.
|
|
*/
|
|
static enum pnfs_try_status
|
|
pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
|
|
const struct rpc_call_ops *call_ops,
|
|
struct pnfs_layout_segment *lseg)
|
|
{
|
|
struct inode *inode = hdr->inode;
|
|
struct nfs_server *nfss = NFS_SERVER(inode);
|
|
enum pnfs_try_status trypnfs;
|
|
|
|
hdr->mds_ops = call_ops;
|
|
|
|
dprintk("%s: Reading ino:%lu %u@%llu\n",
|
|
__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
|
|
|
|
trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
|
|
if (trypnfs != PNFS_NOT_ATTEMPTED)
|
|
nfs_inc_stats(inode, NFSIOS_PNFS_READ);
|
|
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
|
|
return trypnfs;
|
|
}
|
|
|
|
/* Resend all requests through pnfs. */
|
|
int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
|
|
nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
|
|
return nfs_pageio_resend(&pgio, hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
|
|
|
|
static void
|
|
pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
|
|
{
|
|
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
|
|
struct pnfs_layout_segment *lseg = desc->pg_lseg;
|
|
enum pnfs_try_status trypnfs;
|
|
int err = 0;
|
|
|
|
trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
|
|
if (trypnfs == PNFS_TRY_AGAIN)
|
|
err = pnfs_read_resend_pnfs(hdr);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED || err)
|
|
pnfs_read_through_mds(desc, hdr);
|
|
}
|
|
|
|
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
|
|
{
|
|
pnfs_put_lseg(hdr->lseg);
|
|
nfs_pgio_header_free(hdr);
|
|
}
|
|
|
|
int
|
|
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
|
|
if (!hdr) {
|
|
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
|
|
return -ENOMEM;
|
|
}
|
|
nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
|
|
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
|
|
ret = nfs_generic_pgio(desc, hdr);
|
|
if (!ret)
|
|
pnfs_do_read(desc, hdr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
|
|
|
|
static void pnfs_clear_layoutcommitting(struct inode *inode)
|
|
{
|
|
unsigned long *bitlock = &NFS_I(inode)->flags;
|
|
|
|
clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
|
|
}
|
|
|
|
/*
|
|
* There can be multiple RW segments.
|
|
*/
|
|
static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
|
|
{
|
|
struct pnfs_layout_segment *lseg;
|
|
|
|
list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
|
|
if (lseg->pls_range.iomode == IOMODE_RW &&
|
|
test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
|
|
list_add(&lseg->pls_lc_list, listp);
|
|
}
|
|
}
|
|
|
|
static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
|
|
/* Matched by references in pnfs_set_layoutcommit */
|
|
list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
|
|
list_del_init(&lseg->pls_lc_list);
|
|
pnfs_put_lseg(lseg);
|
|
}
|
|
|
|
pnfs_clear_layoutcommitting(inode);
|
|
}
|
|
|
|
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
|
|
{
|
|
pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
|
|
|
|
void
|
|
pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
|
|
loff_t end_pos)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
bool mark_as_dirty = false;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
|
|
nfsi->layout->plh_lwb = end_pos;
|
|
mark_as_dirty = true;
|
|
dprintk("%s: Set layoutcommit for inode %lu ",
|
|
__func__, inode->i_ino);
|
|
} else if (end_pos > nfsi->layout->plh_lwb)
|
|
nfsi->layout->plh_lwb = end_pos;
|
|
if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
|
|
/* references matched in nfs4_layoutcommit_release */
|
|
pnfs_get_lseg(lseg);
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
dprintk("%s: lseg %p end_pos %llu\n",
|
|
__func__, lseg, nfsi->layout->plh_lwb);
|
|
|
|
/* if pnfs_layoutcommit_inode() runs between inode locks, the next one
|
|
* will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
|
|
if (mark_as_dirty)
|
|
mark_inode_dirty_sync(inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
|
|
|
|
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
|
|
{
|
|
struct nfs_server *nfss = NFS_SERVER(data->args.inode);
|
|
|
|
if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
|
|
nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
|
|
pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
|
|
}
|
|
|
|
/*
|
|
* For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
|
|
* NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
|
|
* data to disk to allow the server to recover the data if it crashes.
|
|
* LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
|
|
* is off, and a COMMIT is sent to a data server, or
|
|
* if WRITEs to a data server return NFS_DATA_SYNC.
|
|
*/
|
|
int
|
|
pnfs_layoutcommit_inode(struct inode *inode, bool sync)
|
|
{
|
|
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
|
|
struct nfs4_layoutcommit_data *data;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t end_pos;
|
|
int status;
|
|
|
|
if (!pnfs_layoutcommit_outstanding(inode))
|
|
return 0;
|
|
|
|
dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
|
|
|
|
status = -EAGAIN;
|
|
if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
|
|
if (!sync)
|
|
goto out;
|
|
status = wait_on_bit_lock_action(&nfsi->flags,
|
|
NFS_INO_LAYOUTCOMMITTING,
|
|
nfs_wait_bit_killable,
|
|
TASK_KILLABLE);
|
|
if (status)
|
|
goto out;
|
|
}
|
|
|
|
status = -ENOMEM;
|
|
/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
|
|
data = kzalloc(sizeof(*data), GFP_NOFS);
|
|
if (!data)
|
|
goto clear_layoutcommitting;
|
|
|
|
status = 0;
|
|
spin_lock(&inode->i_lock);
|
|
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
|
|
goto out_unlock;
|
|
|
|
INIT_LIST_HEAD(&data->lseg_list);
|
|
pnfs_list_write_lseg(inode, &data->lseg_list);
|
|
|
|
end_pos = nfsi->layout->plh_lwb;
|
|
|
|
nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
data->args.inode = inode;
|
|
data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
|
|
nfs_fattr_init(&data->fattr);
|
|
data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
|
|
data->res.fattr = &data->fattr;
|
|
data->args.lastbytewritten = end_pos - 1;
|
|
data->res.server = NFS_SERVER(inode);
|
|
|
|
if (ld->prepare_layoutcommit) {
|
|
status = ld->prepare_layoutcommit(&data->args);
|
|
if (status) {
|
|
spin_lock(&inode->i_lock);
|
|
set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
|
|
if (end_pos > nfsi->layout->plh_lwb)
|
|
nfsi->layout->plh_lwb = end_pos;
|
|
spin_unlock(&inode->i_lock);
|
|
put_rpccred(data->cred);
|
|
goto clear_layoutcommitting;
|
|
}
|
|
}
|
|
|
|
|
|
status = nfs4_proc_layoutcommit(data, sync);
|
|
out:
|
|
if (status)
|
|
mark_inode_dirty_sync(inode);
|
|
dprintk("<-- %s status %d\n", __func__, status);
|
|
return status;
|
|
out_unlock:
|
|
spin_unlock(&inode->i_lock);
|
|
kfree(data);
|
|
clear_layoutcommitting:
|
|
pnfs_clear_layoutcommitting(inode);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
|
|
|
|
int
|
|
pnfs_generic_sync(struct inode *inode, bool datasync)
|
|
{
|
|
return pnfs_layoutcommit_inode(inode, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_sync);
|
|
|
|
struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
|
|
{
|
|
struct nfs4_threshold *thp;
|
|
|
|
thp = kzalloc(sizeof(*thp), GFP_NOFS);
|
|
if (!thp) {
|
|
dprintk("%s mdsthreshold allocation failed\n", __func__);
|
|
return NULL;
|
|
}
|
|
return thp;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4_2)
|
|
int
|
|
pnfs_report_layoutstat(struct inode *inode)
|
|
{
|
|
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs42_layoutstat_data *data;
|
|
struct pnfs_layout_hdr *hdr;
|
|
int status = 0;
|
|
|
|
if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
|
|
goto out;
|
|
|
|
if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
|
|
goto out;
|
|
|
|
if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
|
|
goto out;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (!NFS_I(inode)->layout) {
|
|
spin_unlock(&inode->i_lock);
|
|
goto out;
|
|
}
|
|
hdr = NFS_I(inode)->layout;
|
|
pnfs_get_layout_hdr(hdr);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data) {
|
|
status = -ENOMEM;
|
|
goto out_put;
|
|
}
|
|
|
|
data->args.fh = NFS_FH(inode);
|
|
data->args.inode = inode;
|
|
nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
|
|
status = ld->prepare_layoutstats(&data->args);
|
|
if (status)
|
|
goto out_free;
|
|
|
|
status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
|
|
|
|
out:
|
|
dprintk("%s returns %d\n", __func__, status);
|
|
return status;
|
|
|
|
out_free:
|
|
kfree(data);
|
|
out_put:
|
|
pnfs_put_layout_hdr(hdr);
|
|
smp_mb__before_atomic();
|
|
clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
|
|
smp_mb__after_atomic();
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
|
|
#endif
|