![Bryan Schumaker](/assets/img/avatar_default.png)
This patch exports symbols needed by the v4 module. In addition, I also switch over to using IS_ENABLED() to check if CONFIG_NFS_V4 or CONFIG_NFS_V4_MODULE are set. The module (nfs4.ko) will be created in the same directory as nfs.ko and will be automatically loaded the first time you try to mount over NFS v4. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1753 lines
46 KiB
C
1753 lines
46 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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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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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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* 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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/* 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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/* Reset MDS Threshold I/O counters */
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NFS_I(lo->plh_inode)->write_io = 0;
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NFS_I(lo->plh_inode)->read_io = 0;
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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)
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{
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struct pnfs_layout_segment *lseg, *tmp;
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struct pnfs_layout_hdr *lo;
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if (list_empty(free_me))
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return;
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lo = list_first_entry(free_me, struct pnfs_layout_segment,
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pls_list)->pls_layout;
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if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
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struct nfs_client *clp;
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clp = NFS_SERVER(lo->plh_inode)->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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list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
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list_del(&lseg->pls_list);
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free_lseg(lseg);
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}
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}
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void
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pnfs_destroy_layout(struct nfs_inode *nfsi)
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{
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struct pnfs_layout_hdr *lo;
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LIST_HEAD(tmp_list);
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spin_lock(&nfsi->vfs_inode.i_lock);
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lo = nfsi->layout;
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if (lo) {
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lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
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mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
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}
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spin_unlock(&nfsi->vfs_inode.i_lock);
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pnfs_free_lseg_list(&tmp_list);
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}
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EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
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|
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/*
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* Called by the state manger to remove all layouts established under an
|
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* expired lease.
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*/
|
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void
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pnfs_destroy_all_layouts(struct nfs_client *clp)
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{
|
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struct nfs_server *server;
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struct pnfs_layout_hdr *lo;
|
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LIST_HEAD(tmp_list);
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|
|
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), 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);
|
|
struct nfs4_layoutreturn *lrp;
|
|
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 || pnfs_test_layout_returned(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 */
|
|
get_layout_hdr(lo);
|
|
empty = list_empty(&lo->plh_segs);
|
|
mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
|
|
/* Don't send a LAYOUTRETURN if list was initially empty */
|
|
if (empty) {
|
|
spin_unlock(&ino->i_lock);
|
|
put_layout_hdr(lo);
|
|
dprintk("NFS: %s no layout segments to return\n", __func__);
|
|
goto out;
|
|
}
|
|
lo->plh_block_lgets++;
|
|
pnfs_mark_layout_returned(lo);
|
|
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);
|
|
pnfs_clear_layout_returned(lo);
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(_pnfs_return_layout);
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (pnfs_within_mdsthreshold(ctx, ino, iomode))
|
|
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;
|
|
|
|
/* Enable LAYOUTRETURNs */
|
|
pnfs_clear_layout_returned(lo);
|
|
|
|
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);
|
|
|
|
if (req->wb_offset != req->wb_pgbase) {
|
|
nfs_pageio_reset_read_mds(pgio);
|
|
return;
|
|
}
|
|
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);
|
|
|
|
if (req->wb_offset != req->wb_pgbase) {
|
|
nfs_pageio_reset_write_mds(pgio);
|
|
return;
|
|
}
|
|
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);
|
|
|
|
void
|
|
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
|
|
|
|
if (ld == NULL)
|
|
nfs_pageio_init_read(pgio, inode, compl_ops);
|
|
else
|
|
nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
|
|
}
|
|
|
|
void
|
|
pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
|
|
int ioflags,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
|
|
|
|
if (ld == NULL)
|
|
nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
|
|
else
|
|
nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
|
|
}
|
|
|
|
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);
|
|
|
|
int pnfs_write_done_resend_to_mds(struct inode *inode,
|
|
struct list_head *head,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
LIST_HEAD(failed);
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
|
|
|
|
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);
|
|
}
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
|
|
data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
|
|
&hdr->pages,
|
|
hdr->completion_ops);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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;
|
|
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
|
|
list_splice_tail_init(&hdr->pages, &desc->pg_list);
|
|
nfs_pageio_reset_write_mds(desc);
|
|
desc->pg_recoalesce = 1;
|
|
}
|
|
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;
|
|
|
|
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)
|
|
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_first_entry(head, 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);
|
|
}
|
|
|
|
static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
|
|
{
|
|
put_lseg(hdr->lseg);
|
|
nfs_writehdr_free(hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
|
|
|
|
int
|
|
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_write_header *whdr;
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
whdr = nfs_writehdr_alloc();
|
|
if (!whdr) {
|
|
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
hdr = &whdr->header;
|
|
nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
|
|
hdr->lseg = get_lseg(desc->pg_lseg);
|
|
atomic_inc(&hdr->refcnt);
|
|
ret = nfs_generic_flush(desc, hdr);
|
|
if (ret != 0) {
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
} else
|
|
pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
|
|
if (atomic_dec_and_test(&hdr->refcnt))
|
|
hdr->completion_ops->completion(hdr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
|
|
|
|
int pnfs_read_done_resend_to_mds(struct inode *inode,
|
|
struct list_head *head,
|
|
const struct nfs_pgio_completion_ops *compl_ops)
|
|
{
|
|
struct nfs_pageio_descriptor pgio;
|
|
LIST_HEAD(failed);
|
|
|
|
/* Resend all requests through the MDS */
|
|
nfs_pageio_init_read(&pgio, inode, compl_ops);
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
|
|
|
|
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);
|
|
}
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
|
|
data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
|
|
&hdr->pages,
|
|
hdr->completion_ops);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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;
|
|
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
|
|
list_splice_tail_init(&hdr->pages, &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;
|
|
|
|
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)
|
|
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_first_entry(head, 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);
|
|
}
|
|
|
|
static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
|
|
{
|
|
put_lseg(hdr->lseg);
|
|
nfs_readhdr_free(hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
|
|
|
|
int
|
|
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_read_header *rhdr;
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
rhdr = nfs_readhdr_alloc();
|
|
if (!rhdr) {
|
|
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
|
|
ret = -ENOMEM;
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
return ret;
|
|
}
|
|
hdr = &rhdr->header;
|
|
nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
|
|
hdr->lseg = get_lseg(desc->pg_lseg);
|
|
atomic_inc(&hdr->refcnt);
|
|
ret = nfs_generic_pagein(desc, hdr);
|
|
if (ret != 0) {
|
|
put_lseg(desc->pg_lseg);
|
|
desc->pg_lseg = NULL;
|
|
} else
|
|
pnfs_do_multiple_reads(desc, &hdr->rpc_list);
|
|
if (atomic_dec_and_test(&hdr->refcnt))
|
|
hdr->completion_ops->completion(hdr);
|
|
return ret;
|
|
}
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|