1581 lines
41 KiB
C
1581 lines
41 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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#define NFSDBG_FACILITY NFSDBG_PNFS
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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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/* 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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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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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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if (!try_module_get(ld_type->owner)) {
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dprintk("%s: Could not grab reference on module\n", __func__);
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goto out_no_driver;
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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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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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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 ? ld->alloc_layout_hdr(ino, gfp_flags) :
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kzalloc(sizeof(struct pnfs_layout_hdr), 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 pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
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put_rpccred(lo->plh_lc_cred);
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return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
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}
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static void
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destroy_layout_hdr(struct pnfs_layout_hdr *lo)
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{
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dprintk("%s: freeing layout cache %p\n", __func__, lo);
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BUG_ON(!list_empty(&lo->plh_layouts));
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NFS_I(lo->plh_inode)->layout = NULL;
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pnfs_free_layout_hdr(lo);
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}
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static void
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put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
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{
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if (atomic_dec_and_test(&lo->plh_refcount))
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destroy_layout_hdr(lo);
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}
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void
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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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destroy_layout_hdr(lo);
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spin_unlock(&inode->i_lock);
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}
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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 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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/* Matched by get_layout_hdr in pnfs_insert_layout */
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put_layout_hdr(NFS_I(ino)->layout);
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}
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static void
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put_lseg_common(struct pnfs_layout_segment *lseg)
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{
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struct inode *inode = lseg->pls_layout->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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if (list_empty(&lseg->pls_layout->plh_segs)) {
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set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
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/* Matched by initial refcount set in alloc_init_layout_hdr */
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put_layout_hdr_locked(lseg->pls_layout);
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}
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rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
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}
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void
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put_lseg(struct pnfs_layout_segment *lseg)
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{
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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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inode = lseg->pls_layout->plh_inode;
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if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
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LIST_HEAD(free_me);
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put_lseg_common(lseg);
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list_add(&lseg->pls_list, &free_me);
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spin_unlock(&inode->i_lock);
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pnfs_free_lseg_list(&free_me);
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}
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}
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EXPORT_SYMBOL_GPL(put_lseg);
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static inline u64
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end_offset(u64 start, u64 len)
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{
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u64 end;
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end = start + len;
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return end >= start ? end : NFS4_MAX_UINT64;
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}
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/* last octet in a range */
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static inline u64
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last_byte_offset(u64 start, u64 len)
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{
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u64 end;
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BUG_ON(!len);
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end = start + len;
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return end > start ? end - 1 : NFS4_MAX_UINT64;
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}
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/*
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* is l2 fully contained in l1?
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* start1 end1
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* [----------------------------------)
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* start2 end2
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* [----------------)
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*/
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static inline int
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lo_seg_contained(struct pnfs_layout_range *l1,
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struct pnfs_layout_range *l2)
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{
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u64 start1 = l1->offset;
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u64 end1 = end_offset(start1, l1->length);
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u64 start2 = l2->offset;
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u64 end2 = end_offset(start2, l2->length);
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return (start1 <= start2) && (end1 >= end2);
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}
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|
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/*
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* is l1 and l2 intersecting?
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* start1 end1
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* [----------------------------------)
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* start2 end2
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* [----------------)
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*/
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static inline int
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lo_seg_intersecting(struct pnfs_layout_range *l1,
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struct pnfs_layout_range *l2)
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{
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u64 start1 = l1->offset;
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u64 end1 = end_offset(start1, l1->length);
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u64 start2 = l2->offset;
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u64 end2 = end_offset(start2, l2->length);
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return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
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(end2 == NFS4_MAX_UINT64 || end2 > start1);
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}
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static bool
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should_free_lseg(struct pnfs_layout_range *lseg_range,
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struct pnfs_layout_range *recall_range)
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{
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return (recall_range->iomode == IOMODE_ANY ||
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lseg_range->iomode == recall_range->iomode) &&
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lo_seg_intersecting(lseg_range, recall_range);
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}
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/* Returns 1 if lseg is removed from list, 0 otherwise */
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static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
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struct list_head *tmp_list)
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{
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int rv = 0;
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if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
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/* Remove the reference keeping the lseg in the
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* list. It will now be removed when all
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* outstanding io is finished.
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*/
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dprintk("%s: lseg %p ref %d\n", __func__, lseg,
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atomic_read(&lseg->pls_refcount));
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if (atomic_dec_and_test(&lseg->pls_refcount)) {
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put_lseg_common(lseg);
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list_add(&lseg->pls_list, tmp_list);
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rv = 1;
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}
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}
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return rv;
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}
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|
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/* Returns count of number of matching invalid lsegs remaining in list
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* after call.
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*/
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int
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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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{
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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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if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
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put_layout_hdr_locked(lo);
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return 0;
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}
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list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
|
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if (!recall_range ||
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should_free_lseg(&lseg->pls_range, recall_range)) {
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dprintk("%s: freeing lseg %p iomode %d "
|
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"offset %llu length %llu\n", __func__,
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lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
|
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lseg->pls_range.length);
|
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invalid++;
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removed += mark_lseg_invalid(lseg, tmp_list);
|
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}
|
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dprintk("%s:Return %i\n", __func__, invalid - removed);
|
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return invalid - removed;
|
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}
|
|
|
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/* note free_me must contain lsegs from a single layout_hdr */
|
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void
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pnfs_free_lseg_list(struct list_head *free_me)
|
|
{
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
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struct pnfs_layout_hdr *lo;
|
|
|
|
if (list_empty(free_me))
|
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return;
|
|
|
|
lo = list_first_entry(free_me, struct pnfs_layout_segment,
|
|
pls_list)->pls_layout;
|
|
|
|
if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
|
|
struct nfs_client *clp;
|
|
|
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clp = NFS_SERVER(lo->plh_inode)->nfs_client;
|
|
spin_lock(&clp->cl_lock);
|
|
list_del_init(&lo->plh_layouts);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
|
|
list_del(&lseg->pls_list);
|
|
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 */
|
|
mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
|
|
}
|
|
spin_unlock(&nfsi->vfs_inode.i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
}
|
|
|
|
/*
|
|
* Called by the state manger to remove all layouts established under an
|
|
* expired lease.
|
|
*/
|
|
void
|
|
pnfs_destroy_all_layouts(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
struct pnfs_layout_hdr *lo;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
nfs4_deviceid_mark_client_invalid(clp);
|
|
nfs4_deviceid_purge_client(clp);
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
if (!list_empty(&server->layouts))
|
|
list_splice_init(&server->layouts, &tmp_list);
|
|
}
|
|
rcu_read_unlock();
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
while (!list_empty(&tmp_list)) {
|
|
lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
|
|
plh_layouts);
|
|
dprintk("%s freeing layout for inode %lu\n", __func__,
|
|
lo->plh_inode->i_ino);
|
|
list_del_init(&lo->plh_layouts);
|
|
pnfs_destroy_layout(NFS_I(lo->plh_inode));
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
|
|
oldseq = be32_to_cpu(lo->plh_stateid.seqid);
|
|
newseq = be32_to_cpu(new->seqid);
|
|
if ((int)(newseq - oldseq) > 0) {
|
|
nfs4_stateid_copy(&lo->plh_stateid, new);
|
|
if (update_barrier) {
|
|
u32 new_barrier = be32_to_cpu(new->seqid);
|
|
|
|
if ((int)(new_barrier - lo->plh_barrier))
|
|
lo->plh_barrier = new_barrier;
|
|
} else {
|
|
/* Because of wraparound, we want to keep the barrier
|
|
* "close" to the current seqids. It needs to be
|
|
* within 2**31 to count as "behind", so if it
|
|
* gets too near that limit, give us a litle leeway
|
|
* and bring it to within 2**30.
|
|
* NOTE - and yes, this is all unsigned arithmetic.
|
|
*/
|
|
if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
|
|
lo->plh_barrier = newseq - (1 << 30);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* lget is set to 1 if called from inside send_layoutget call chain */
|
|
static bool
|
|
pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
|
|
int lget)
|
|
{
|
|
if ((stateid) &&
|
|
(int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0)
|
|
return true;
|
|
return lo->plh_block_lgets ||
|
|
test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
|
|
(list_empty(&lo->plh_segs) &&
|
|
(atomic_read(&lo->plh_outstanding) > lget));
|
|
}
|
|
|
|
int
|
|
pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
|
|
struct nfs4_state *open_state)
|
|
{
|
|
int status = 0;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
spin_lock(&lo->plh_inode->i_lock);
|
|
if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
|
|
status = -EAGAIN;
|
|
} else if (list_empty(&lo->plh_segs)) {
|
|
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 = NULL;
|
|
struct page **pages = NULL;
|
|
int i;
|
|
u32 max_resp_sz, max_pages;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
|
|
BUG_ON(ctx == NULL);
|
|
lgp = kzalloc(sizeof(*lgp), gfp_flags);
|
|
if (lgp == NULL)
|
|
return NULL;
|
|
|
|
/* allocate pages for xdr post processing */
|
|
max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
|
|
max_pages = nfs_page_array_len(0, max_resp_sz);
|
|
|
|
pages = kcalloc(max_pages, sizeof(struct page *), gfp_flags);
|
|
if (!pages)
|
|
goto out_err_free;
|
|
|
|
for (i = 0; i < max_pages; i++) {
|
|
pages[i] = alloc_page(gfp_flags);
|
|
if (!pages[i])
|
|
goto out_err_free;
|
|
}
|
|
|
|
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->args.layout.pages = pages;
|
|
lgp->args.layout.pglen = max_pages * PAGE_SIZE;
|
|
lgp->lsegpp = &lseg;
|
|
lgp->gfp_flags = gfp_flags;
|
|
|
|
/* Synchronously retrieve layout information from server and
|
|
* store in lseg.
|
|
*/
|
|
nfs4_proc_layoutget(lgp);
|
|
if (!lseg) {
|
|
/* remember that LAYOUTGET failed and suspend trying */
|
|
set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
|
|
}
|
|
|
|
/* free xdr pages */
|
|
for (i = 0; i < max_pages; i++)
|
|
__free_page(pages[i]);
|
|
kfree(pages);
|
|
|
|
return lseg;
|
|
|
|
out_err_free:
|
|
/* free any allocated xdr pages, lgp as it's not used */
|
|
if (pages) {
|
|
for (i = 0; i < max_pages; i++) {
|
|
if (!pages[i])
|
|
break;
|
|
__free_page(pages[i]);
|
|
}
|
|
kfree(pages);
|
|
}
|
|
kfree(lgp);
|
|
return NULL;
|
|
}
|
|
|
|
/* Initiates a LAYOUTRETURN(FILE) */
|
|
int
|
|
_pnfs_return_layout(struct inode *ino)
|
|
{
|
|
struct pnfs_layout_hdr *lo = NULL;
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
LIST_HEAD(tmp_list);
|
|
struct nfs4_layoutreturn *lrp;
|
|
nfs4_stateid stateid;
|
|
int status = 0;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = nfsi->layout;
|
|
if (!lo) {
|
|
spin_unlock(&ino->i_lock);
|
|
dprintk("%s: no layout to return\n", __func__);
|
|
return status;
|
|
}
|
|
stateid = nfsi->layout->plh_stateid;
|
|
/* Reference matched in nfs4_layoutreturn_release */
|
|
get_layout_hdr(lo);
|
|
mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
|
|
lo->plh_block_lgets++;
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
|
|
WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
|
|
|
|
lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
|
|
if (unlikely(lrp == NULL)) {
|
|
status = -ENOMEM;
|
|
set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
|
|
set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
|
|
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.layout = lo;
|
|
lrp->clp = NFS_SERVER(ino)->nfs_client;
|
|
|
|
status = nfs4_proc_layoutreturn(lrp);
|
|
out:
|
|
dprintk("<-- %s status: %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
bool pnfs_roc(struct inode *ino)
|
|
{
|
|
struct pnfs_layout_hdr *lo;
|
|
struct pnfs_layout_segment *lseg, *tmp;
|
|
LIST_HEAD(tmp_list);
|
|
bool found = false;
|
|
|
|
spin_lock(&ino->i_lock);
|
|
lo = NFS_I(ino)->layout;
|
|
if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
|
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
|
|
goto out_nolayout;
|
|
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_nolayout;
|
|
lo->plh_block_lgets++;
|
|
get_layout_hdr(lo); /* matched in pnfs_roc_release */
|
|
spin_unlock(&ino->i_lock);
|
|
pnfs_free_lseg_list(&tmp_list);
|
|
return true;
|
|
|
|
out_nolayout:
|
|
spin_unlock(&ino->i_lock);
|
|
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--;
|
|
put_layout_hdr_locked(lo);
|
|
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 ((int)(barrier - lo->plh_barrier) > 0)
|
|
lo->plh_barrier = barrier;
|
|
spin_unlock(&ino->i_lock);
|
|
}
|
|
|
|
bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(ino);
|
|
struct pnfs_layout_segment *lseg;
|
|
bool found = 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)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
if (!found) {
|
|
struct pnfs_layout_hdr *lo = nfsi->layout;
|
|
u32 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);
|
|
}
|
|
spin_unlock(&ino->i_lock);
|
|
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
|
|
cmp_layout(struct pnfs_layout_range *l1,
|
|
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_insert_layout(struct pnfs_layout_hdr *lo,
|
|
struct pnfs_layout_segment *lseg)
|
|
{
|
|
struct pnfs_layout_segment *lp;
|
|
|
|
dprintk("%s:Begin\n", __func__);
|
|
|
|
assert_spin_locked(&lo->plh_inode->i_lock);
|
|
list_for_each_entry(lp, &lo->plh_segs, pls_list) {
|
|
if (cmp_layout(&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:
|
|
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_recall);
|
|
lo->plh_inode = ino;
|
|
lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_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);
|
|
|
|
assert_spin_locked(&ino->i_lock);
|
|
if (nfsi->layout) {
|
|
if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
|
|
return NULL;
|
|
else
|
|
return nfsi->layout;
|
|
}
|
|
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;
|
|
else
|
|
pnfs_free_layout_hdr(new);
|
|
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 int
|
|
is_matching_lseg(struct pnfs_layout_range *ls_range,
|
|
struct pnfs_layout_range *range)
|
|
{
|
|
struct pnfs_layout_range range1;
|
|
|
|
if ((range->iomode == IOMODE_RW &&
|
|
ls_range->iomode != IOMODE_RW) ||
|
|
!lo_seg_intersecting(ls_range, range))
|
|
return 0;
|
|
|
|
/* range1 covers only the first byte in the range */
|
|
range1 = *range;
|
|
range1.length = 1;
|
|
return lo_seg_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__);
|
|
|
|
assert_spin_locked(&lo->plh_inode->i_lock);
|
|
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
|
|
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
|
|
is_matching_lseg(&lseg->pls_range, range)) {
|
|
ret = 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;
|
|
}
|
|
|
|
/*
|
|
* 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_inode *nfsi = NFS_I(ino);
|
|
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 = false;
|
|
|
|
if (!pnfs_enabled_sb(NFS_SERVER(ino)))
|
|
return NULL;
|
|
spin_lock(&ino->i_lock);
|
|
lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
|
|
if (lo == NULL) {
|
|
dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* 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 (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
|
|
goto out_unlock;
|
|
|
|
/* Check to see if the layout for the given range already exists */
|
|
lseg = pnfs_find_lseg(lo, &arg);
|
|
if (lseg)
|
|
goto out_unlock;
|
|
|
|
if (pnfs_layoutgets_blocked(lo, NULL, 0))
|
|
goto out_unlock;
|
|
atomic_inc(&lo->plh_outstanding);
|
|
|
|
get_layout_hdr(lo);
|
|
if (list_empty(&lo->plh_segs))
|
|
first = true;
|
|
spin_unlock(&ino->i_lock);
|
|
if (first) {
|
|
/* 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);
|
|
BUG_ON(!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);
|
|
if (!lseg && first) {
|
|
spin_lock(&clp->cl_lock);
|
|
list_del_init(&lo->plh_layouts);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
atomic_dec(&lo->plh_outstanding);
|
|
put_layout_hdr(lo);
|
|
out:
|
|
dprintk("%s end, state 0x%lx lseg %p\n", __func__,
|
|
nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
|
|
return lseg;
|
|
out_unlock:
|
|
spin_unlock(&ino->i_lock);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_update_layout);
|
|
|
|
int
|
|
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;
|
|
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;
|
|
}
|
|
|
|
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, &res->stateid, 1)) {
|
|
dprintk("%s forget reply due to state\n", __func__);
|
|
goto out_forget_reply;
|
|
}
|
|
init_lseg(lo, lseg);
|
|
lseg->pls_range = res->range;
|
|
*lgp->lsegpp = get_lseg(lseg);
|
|
pnfs_insert_layout(lo, lseg);
|
|
|
|
if (res->return_on_close) {
|
|
set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
|
|
set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
|
|
}
|
|
|
|
/* Done processing layoutget. Set the layout stateid */
|
|
pnfs_set_layout_stateid(lo, &res->stateid, false);
|
|
spin_unlock(&ino->i_lock);
|
|
out:
|
|
return status;
|
|
|
|
out_forget_reply:
|
|
spin_unlock(&ino->i_lock);
|
|
lseg->pls_layout = lo;
|
|
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
|
|
goto out;
|
|
}
|
|
|
|
void
|
|
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
|
{
|
|
BUG_ON(pgio->pg_lseg != NULL);
|
|
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
req_offset(req),
|
|
req->wb_bytes,
|
|
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)
|
|
{
|
|
BUG_ON(pgio->pg_lseg != NULL);
|
|
|
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
|
|
req->wb_context,
|
|
req_offset(req),
|
|
req->wb_bytes,
|
|
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);
|
|
|
|
bool
|
|
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
|
|
|
|
if (ld == NULL)
|
|
return false;
|
|
nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
|
|
|
|
if (ld == NULL)
|
|
return false;
|
|
nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
|
struct nfs_page *req)
|
|
{
|
|
if (pgio->pg_lseg == NULL)
|
|
return nfs_generic_pg_test(pgio, prev, req);
|
|
|
|
/*
|
|
* Test if a nfs_page is fully contained in the pnfs_layout_range.
|
|
* Note that this test makes several assumptions:
|
|
* - that the previous nfs_page in the struct nfs_pageio_descriptor
|
|
* is known to lie within the range.
|
|
* - that the nfs_page being tested is known to be contiguous with the
|
|
* previous nfs_page.
|
|
* - Layout ranges are page aligned, so we only have to test the
|
|
* start offset of the request.
|
|
*
|
|
* Please also note that 'end_offset' is actually the offset of the
|
|
* first byte that lies outside the pnfs_layout_range. FIXME?
|
|
*
|
|
*/
|
|
return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
|
|
pgio->pg_lseg->pls_range.length);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
|
|
|
|
static int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
LIST_HEAD(failed);
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_write_mds(&pgio, inode, FLUSH_STABLE);
|
|
while (!list_empty(head)) {
|
|
struct nfs_page *req = nfs_list_entry(head->next);
|
|
|
|
nfs_list_remove_request(req);
|
|
if (!nfs_pageio_add_request(&pgio, req))
|
|
nfs_list_add_request(req, &failed);
|
|
}
|
|
nfs_pageio_complete(&pgio);
|
|
|
|
if (!list_empty(&failed)) {
|
|
/* For some reason our attempt to resend pages. Mark the
|
|
* overall send request as having failed, and let
|
|
* nfs_writeback_release_full deal with the error.
|
|
*/
|
|
list_move(&failed, head);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
dprintk("pnfs write error = %d\n", hdr->pnfs_error);
|
|
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
|
|
PNFS_LAYOUTRET_ON_ERROR) {
|
|
clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
|
|
pnfs_return_layout(hdr->inode);
|
|
}
|
|
data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode, &hdr->pages);
|
|
}
|
|
|
|
/*
|
|
* Called by non rpc-based layout drivers
|
|
*/
|
|
void pnfs_ld_write_done(struct nfs_write_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
if (!hdr->pnfs_error) {
|
|
pnfs_set_layoutcommit(data);
|
|
hdr->mds_ops->rpc_call_done(&data->task, data);
|
|
} else
|
|
pnfs_ld_handle_write_error(data);
|
|
put_lseg(hdr->lseg);
|
|
hdr->mds_ops->rpc_release(data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
|
|
|
|
static void
|
|
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_write_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
list_splice_tail_init(&hdr->pages, &desc->pg_list);
|
|
if (hdr->req && list_empty(&hdr->req->wb_list))
|
|
nfs_list_add_request(hdr->req, &desc->pg_list);
|
|
nfs_pageio_reset_write_mds(desc);
|
|
desc->pg_recoalesce = 1;
|
|
put_lseg(hdr->lseg);
|
|
nfs_writedata_release(data);
|
|
}
|
|
|
|
static enum pnfs_try_status
|
|
pnfs_try_to_write_data(struct nfs_write_data *wdata,
|
|
const struct rpc_call_ops *call_ops,
|
|
struct pnfs_layout_segment *lseg,
|
|
int how)
|
|
{
|
|
struct nfs_pgio_header *hdr = wdata->header;
|
|
struct inode *inode = hdr->inode;
|
|
enum pnfs_try_status trypnfs;
|
|
struct nfs_server *nfss = NFS_SERVER(inode);
|
|
|
|
hdr->mds_ops = call_ops;
|
|
hdr->lseg = get_lseg(lseg);
|
|
|
|
dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
|
|
inode->i_ino, wdata->args.count, wdata->args.offset, how);
|
|
|
|
trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED) {
|
|
put_lseg(hdr->lseg);
|
|
hdr->lseg = NULL;
|
|
} else
|
|
nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
|
|
|
|
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
|
|
return trypnfs;
|
|
}
|
|
|
|
static void
|
|
pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
|
|
{
|
|
struct nfs_write_data *data;
|
|
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
|
|
struct pnfs_layout_segment *lseg = desc->pg_lseg;
|
|
|
|
desc->pg_lseg = NULL;
|
|
while (!list_empty(head)) {
|
|
enum pnfs_try_status trypnfs;
|
|
|
|
data = list_entry(head->next, struct nfs_write_data, list);
|
|
list_del_init(&data->list);
|
|
|
|
trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED)
|
|
pnfs_write_through_mds(desc, data);
|
|
}
|
|
put_lseg(lseg);
|
|
}
|
|
|
|
int
|
|
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
LIST_HEAD(head);
|
|
int ret;
|
|
|
|
ret = nfs_generic_flush(desc, &head);
|
|
if (ret != 0) {
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
return ret;
|
|
}
|
|
pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
|
|
|
|
static int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
LIST_HEAD(failed);
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_read_mds(&pgio, inode);
|
|
while (!list_empty(head)) {
|
|
struct nfs_page *req = nfs_list_entry(head->next);
|
|
|
|
nfs_list_remove_request(req);
|
|
if (!nfs_pageio_add_request(&pgio, req))
|
|
nfs_list_add_request(req, &failed);
|
|
}
|
|
nfs_pageio_complete(&pgio);
|
|
|
|
if (!list_empty(&failed)) {
|
|
list_move(&failed, head);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
dprintk("pnfs read error = %d\n", hdr->pnfs_error);
|
|
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
|
|
PNFS_LAYOUTRET_ON_ERROR) {
|
|
clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
|
|
pnfs_return_layout(hdr->inode);
|
|
}
|
|
data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode, &hdr->pages);
|
|
}
|
|
|
|
/*
|
|
* Called by non rpc-based layout drivers
|
|
*/
|
|
void pnfs_ld_read_done(struct nfs_read_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
if (likely(!hdr->pnfs_error)) {
|
|
__nfs4_read_done_cb(data);
|
|
hdr->mds_ops->rpc_call_done(&data->task, data);
|
|
} else
|
|
pnfs_ld_handle_read_error(data);
|
|
put_lseg(hdr->lseg);
|
|
hdr->mds_ops->rpc_release(data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
|
|
|
|
static void
|
|
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_read_data *data)
|
|
{
|
|
struct nfs_pgio_header *hdr = data->header;
|
|
|
|
list_splice_tail_init(&hdr->pages, &desc->pg_list);
|
|
if (hdr->req && list_empty(&hdr->req->wb_list))
|
|
nfs_list_add_request(hdr->req, &desc->pg_list);
|
|
nfs_pageio_reset_read_mds(desc);
|
|
desc->pg_recoalesce = 1;
|
|
nfs_readdata_release(data);
|
|
}
|
|
|
|
/*
|
|
* Call the appropriate parallel I/O subsystem read function.
|
|
*/
|
|
static enum pnfs_try_status
|
|
pnfs_try_to_read_data(struct nfs_read_data *rdata,
|
|
const struct rpc_call_ops *call_ops,
|
|
struct pnfs_layout_segment *lseg)
|
|
{
|
|
struct nfs_pgio_header *hdr = rdata->header;
|
|
struct inode *inode = hdr->inode;
|
|
struct nfs_server *nfss = NFS_SERVER(inode);
|
|
enum pnfs_try_status trypnfs;
|
|
|
|
hdr->mds_ops = call_ops;
|
|
hdr->lseg = get_lseg(lseg);
|
|
|
|
dprintk("%s: Reading ino:%lu %u@%llu\n",
|
|
__func__, inode->i_ino, rdata->args.count, rdata->args.offset);
|
|
|
|
trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED) {
|
|
put_lseg(hdr->lseg);
|
|
hdr->lseg = NULL;
|
|
} else {
|
|
nfs_inc_stats(inode, NFSIOS_PNFS_READ);
|
|
}
|
|
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
|
|
return trypnfs;
|
|
}
|
|
|
|
static void
|
|
pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
|
|
{
|
|
struct nfs_read_data *data;
|
|
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
|
|
struct pnfs_layout_segment *lseg = desc->pg_lseg;
|
|
|
|
desc->pg_lseg = NULL;
|
|
while (!list_empty(head)) {
|
|
enum pnfs_try_status trypnfs;
|
|
|
|
data = list_entry(head->next, struct nfs_read_data, list);
|
|
list_del_init(&data->list);
|
|
|
|
trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
|
|
if (trypnfs == PNFS_NOT_ATTEMPTED)
|
|
pnfs_read_through_mds(desc, data);
|
|
}
|
|
put_lseg(lseg);
|
|
}
|
|
|
|
int
|
|
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
LIST_HEAD(head);
|
|
int ret;
|
|
|
|
ret = nfs_generic_pagein(desc, &head);
|
|
if (ret != 0) {
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
return ret;
|
|
}
|
|
pnfs_do_multiple_reads(desc, &head);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
|
|
|
|
/*
|
|
* 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_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
|
|
list_add(&lseg->pls_lc_list, listp);
|
|
}
|
|
}
|
|
|
|
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
|
|
{
|
|
if (lseg->pls_range.iomode == IOMODE_RW) {
|
|
dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
|
|
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
|
|
} else {
|
|
dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
|
|
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
|
|
|
|
void
|
|
pnfs_set_layoutcommit(struct nfs_write_data *wdata)
|
|
{
|
|
struct nfs_pgio_header *hdr = wdata->header;
|
|
struct inode *inode = hdr->inode;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t end_pos = wdata->mds_offset + wdata->res.count;
|
|
bool mark_as_dirty = false;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
|
|
mark_as_dirty = true;
|
|
dprintk("%s: Set layoutcommit for inode %lu ",
|
|
__func__, inode->i_ino);
|
|
}
|
|
if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
|
|
/* references matched in nfs4_layoutcommit_release */
|
|
get_lseg(hdr->lseg);
|
|
}
|
|
if (end_pos > nfsi->layout->plh_lwb)
|
|
nfsi->layout->plh_lwb = end_pos;
|
|
spin_unlock(&inode->i_lock);
|
|
dprintk("%s: lseg %p end_pos %llu\n",
|
|
__func__, hdr->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);
|
|
}
|
|
|
|
/*
|
|
* 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 nfs4_layoutcommit_data *data;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t end_pos;
|
|
int status = 0;
|
|
|
|
dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
|
|
|
|
if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
|
|
return 0;
|
|
|
|
/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
|
|
data = kzalloc(sizeof(*data), GFP_NOFS);
|
|
if (!data) {
|
|
status = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
|
|
goto out_free;
|
|
|
|
if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
|
|
if (!sync) {
|
|
status = -EAGAIN;
|
|
goto out_free;
|
|
}
|
|
status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
if (status)
|
|
goto out_free;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&data->lseg_list);
|
|
spin_lock(&inode->i_lock);
|
|
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
|
|
clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
|
|
spin_unlock(&inode->i_lock);
|
|
wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
|
|
goto out_free;
|
|
}
|
|
|
|
pnfs_list_write_lseg(inode, &data->lseg_list);
|
|
|
|
end_pos = nfsi->layout->plh_lwb;
|
|
nfsi->layout->plh_lwb = 0;
|
|
|
|
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);
|
|
|
|
status = nfs4_proc_layoutcommit(data, sync);
|
|
out:
|
|
if (status)
|
|
mark_inode_dirty_sync(inode);
|
|
dprintk("<-- %s status %d\n", __func__, status);
|
|
return status;
|
|
out_free:
|
|
kfree(data);
|
|
goto out;
|
|
}
|