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Message-ID: <CALF+zOkvC7kZ9LFQyjsRduQq+-gmaD4bLWc7H=AtVi6=NuC_dA@mail.gmail.com>
Date: Fri, 17 Dec 2021 07:53:55 -0500
From: David Wysochanski <dwysocha@...hat.com>
To: David Howells <dhowells@...hat.com>
Cc: linux-cachefs <linux-cachefs@...hat.com>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
linux-nfs <linux-nfs@...r.kernel.org>,
Trond Myklebust <trondmy@...merspace.com>,
Jeff Layton <jlayton@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 63/68] nfs: Convert to new fscache volume/cookie API
On Thu, Dec 16, 2021 at 11:24 AM David Howells <dhowells@...hat.com> wrote:
>
> From: Dave Wysochanski <dwysocha@...hat.com>
>
> Change the nfs filesystem to support fscache's indexing rewrite and
> reenable caching in nfs.
>
> The following changes have been made:
>
> (1) The fscache_netfs struct is no more, and there's no need to register
> the filesystem as a whole.
>
> (2) The session cookie is now an fscache_volume cookie, allocated with
> fscache_acquire_volume(). That takes three parameters: a string
> representing the "volume" in the index, a string naming the cache to
> use (or NULL) and a u64 that conveys coherency metadata for the
> volume.
>
> For nfs, I've made it render the volume name string as:
>
> "nfs,<ver>,<family>,<address>,<port>,<fsidH>,<fsidL>*<,param>[,<uniq>]"
>
> (3) The fscache_cookie_def is no more and needed information is passed
> directly to fscache_acquire_cookie(). The cache no longer calls back
> into the filesystem, but rather metadata changes are indicated at
> other times.
>
> fscache_acquire_cookie() is passed the same keying and coherency
> information as before.
>
> (4) fscache_enable/disable_cookie() have been removed.
>
> Call fscache_use_cookie() and fscache_unuse_cookie() when a file is
> opened or closed to prevent a cache file from being culled and to keep
> resources to hand that are needed to do I/O.
>
> Unuse the cookie when a file is opened for writing. This is gated by
> the NFS_INO_FSCACHE flag on the nfs_inode.
>
> A better way might be to invalidate it with FSCACHE_INVAL_DIO_WRITE
> which will keep it unused until all open files are closed.
>
Comment still out of date here, reference
https://marc.info/?l=linux-nfs&m=163922984027745&w=4
> (5) fscache_invalidate() now needs to be given uptodate auxiliary data and
> a file size. It also takes a flag to indicate if this was due to a
> DIO write.
>
> (6) Call nfs_fscache_invalidate() with FSCACHE_INVAL_DIO_WRITE on a file
> to which a DIO write is made.
>
> (7) Call fscache_note_page_release() from nfs_release_page().
>
> (8) Use a killable wait in nfs_vm_page_mkwrite() when waiting for
> PG_fscache to be cleared.
>
> (9) The functions to read and write data to/from the cache are stubbed out
> pending a conversion to use netfslib.
>
> Changes
> =======
> ver #3:
> - Added missing =n fallback for nfs_fscache_release_file()[1][2].
>
> ver #2:
> - Use gfpflags_allow_blocking() rather than using flag directly.
> - fscache_acquire_volume() now returns errors.
> - Remove NFS_INO_FSCACHE as it's no longer used.
> - Need to unuse a cookie on file-release, not inode-clear.
>
> Signed-off-by: Dave Wysochanski <dwysocha@...hat.com>
> Co-developed-by: David Howells <dhowells@...hat.com>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Trond Myklebust <trond.myklebust@...merspace.com>
> cc: Anna Schumaker <anna.schumaker@...app.com>
> cc: linux-nfs@...r.kernel.org
> cc: linux-cachefs@...hat.com
> Link: https://lore.kernel.org/r/202112100804.nksO8K4u-lkp@intel.com/ [1]
> Link: https://lore.kernel.org/r/202112100957.2oEDT20W-lkp@intel.com/ [2]
> Link: https://lore.kernel.org/r/163819668938.215744.14448852181937731615.stgit@warthog.procyon.org.uk/ # v1
> Link: https://lore.kernel.org/r/163906979003.143852.2601189243864854724.stgit@warthog.procyon.org.uk/ # v2
> ---
>
> fs/nfs/Kconfig | 2
> fs/nfs/Makefile | 2
> fs/nfs/client.c | 4
> fs/nfs/direct.c | 2
> fs/nfs/file.c | 13 +
> fs/nfs/fscache-index.c | 140 ---------------
> fs/nfs/fscache.c | 434 +++++++++++----------------------------------
> fs/nfs/fscache.h | 127 ++++---------
> fs/nfs/inode.c | 11 -
> fs/nfs/nfstrace.h | 1
> fs/nfs/super.c | 28 ++-
> fs/nfs/write.c | 1
> include/linux/nfs_fs.h | 1
> include/linux/nfs_fs_sb.h | 9 -
> 14 files changed, 172 insertions(+), 603 deletions(-)
> delete mode 100644 fs/nfs/fscache-index.c
>
> diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
> index bdc11b89eac5..14a72224b657 100644
> --- a/fs/nfs/Kconfig
> +++ b/fs/nfs/Kconfig
> @@ -170,7 +170,7 @@ config ROOT_NFS
>
> config NFS_FSCACHE
> bool "Provide NFS client caching support"
> - depends on NFS_FS=m && FSCACHE_OLD_API || NFS_FS=y && FSCACHE_OLD_API=y
> + depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
> help
> Say Y here if you want NFS data to be cached locally on disc through
> the general filesystem cache manager
> diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
> index 22d11fdc6deb..5f6db37f461e 100644
> --- a/fs/nfs/Makefile
> +++ b/fs/nfs/Makefile
> @@ -12,7 +12,7 @@ nfs-y := client.o dir.o file.o getroot.o inode.o super.o \
> export.o sysfs.o fs_context.o
> nfs-$(CONFIG_ROOT_NFS) += nfsroot.o
> nfs-$(CONFIG_SYSCTL) += sysctl.o
> -nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
> +nfs-$(CONFIG_NFS_FSCACHE) += fscache.o
>
> obj-$(CONFIG_NFS_V2) += nfsv2.o
> nfsv2-y := nfs2super.o proc.o nfs2xdr.o
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index 1e4dc1ab9312..8d8b85b5a641 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -183,8 +183,6 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
> clp->cl_net = get_net(cl_init->net);
>
> clp->cl_principal = "*";
> - nfs_fscache_get_client_cookie(clp);
> -
> return clp;
>
> error_cleanup:
> @@ -238,8 +236,6 @@ static void pnfs_init_server(struct nfs_server *server)
> */
> void nfs_free_client(struct nfs_client *clp)
> {
> - nfs_fscache_release_client_cookie(clp);
> -
> /* -EIO all pending I/O */
> if (!IS_ERR(clp->cl_rpcclient))
> rpc_shutdown_client(clp->cl_rpcclient);
> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
> index 9cff8709c80a..eabfdab543c8 100644
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -59,6 +59,7 @@
> #include "internal.h"
> #include "iostat.h"
> #include "pnfs.h"
> +#include "fscache.h"
>
> #define NFSDBG_FACILITY NFSDBG_VFS
>
> @@ -959,6 +960,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
> } else {
> result = requested;
> }
> + nfs_fscache_invalidate(inode, FSCACHE_INVAL_DIO_WRITE);
> out_release:
> nfs_direct_req_release(dreq);
> out:
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index 24e7dccce355..76d76acbc594 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -84,6 +84,7 @@ nfs_file_release(struct inode *inode, struct file *filp)
>
> nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
> nfs_file_clear_open_context(filp);
> + nfs_fscache_release_file(inode, filp);
> return 0;
> }
> EXPORT_SYMBOL_GPL(nfs_file_release);
> @@ -415,8 +416,7 @@ static void nfs_invalidate_page(struct page *page, unsigned int offset,
> return;
> /* Cancel any unstarted writes on this page */
> nfs_wb_page_cancel(page_file_mapping(page)->host, page);
> -
> - nfs_fscache_invalidate_page(page, page->mapping->host);
> + wait_on_page_fscache(page);
> }
>
> /*
> @@ -475,12 +475,11 @@ static void nfs_check_dirty_writeback(struct page *page,
> static int nfs_launder_page(struct page *page)
> {
> struct inode *inode = page_file_mapping(page)->host;
> - struct nfs_inode *nfsi = NFS_I(inode);
>
> dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
> inode->i_ino, (long long)page_offset(page));
>
> - nfs_fscache_wait_on_page_write(nfsi, page);
> + wait_on_page_fscache(page);
> return nfs_wb_page(inode, page);
> }
>
> @@ -555,7 +554,11 @@ static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf)
> sb_start_pagefault(inode->i_sb);
>
> /* make sure the cache has finished storing the page */
> - nfs_fscache_wait_on_page_write(NFS_I(inode), page);
> + if (PageFsCache(page) &&
> + wait_on_page_fscache_killable(vmf->page) < 0) {
> + ret = VM_FAULT_RETRY;
> + goto out;
> + }
>
> wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
> nfs_wait_bit_killable, TASK_KILLABLE);
> diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
> deleted file mode 100644
> index 573b1da9342c..000000000000
> --- a/fs/nfs/fscache-index.c
> +++ /dev/null
> @@ -1,140 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/* NFS FS-Cache index structure definition
> - *
> - * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
> - * Written by David Howells (dhowells@...hat.com)
> - */
> -
> -#include <linux/init.h>
> -#include <linux/kernel.h>
> -#include <linux/sched.h>
> -#include <linux/mm.h>
> -#include <linux/nfs_fs.h>
> -#include <linux/nfs_fs_sb.h>
> -#include <linux/in6.h>
> -#include <linux/iversion.h>
> -
> -#include "internal.h"
> -#include "fscache.h"
> -
> -#define NFSDBG_FACILITY NFSDBG_FSCACHE
> -
> -/*
> - * Define the NFS filesystem for FS-Cache. Upon registration FS-Cache sticks
> - * the cookie for the top-level index object for NFS into here. The top-level
> - * index can than have other cache objects inserted into it.
> - */
> -struct fscache_netfs nfs_fscache_netfs = {
> - .name = "nfs",
> - .version = 0,
> -};
> -
> -/*
> - * Register NFS for caching
> - */
> -int nfs_fscache_register(void)
> -{
> - return fscache_register_netfs(&nfs_fscache_netfs);
> -}
> -
> -/*
> - * Unregister NFS for caching
> - */
> -void nfs_fscache_unregister(void)
> -{
> - fscache_unregister_netfs(&nfs_fscache_netfs);
> -}
> -
> -/*
> - * Define the server object for FS-Cache. This is used to describe a server
> - * object to fscache_acquire_cookie(). It is keyed by the NFS protocol and
> - * server address parameters.
> - */
> -const struct fscache_cookie_def nfs_fscache_server_index_def = {
> - .name = "NFS.server",
> - .type = FSCACHE_COOKIE_TYPE_INDEX,
> -};
> -
> -/*
> - * Define the superblock object for FS-Cache. This is used to describe a
> - * superblock object to fscache_acquire_cookie(). It is keyed by all the NFS
> - * parameters that might cause a separate superblock.
> - */
> -const struct fscache_cookie_def nfs_fscache_super_index_def = {
> - .name = "NFS.super",
> - .type = FSCACHE_COOKIE_TYPE_INDEX,
> -};
> -
> -/*
> - * Consult the netfs about the state of an object
> - * - This function can be absent if the index carries no state data
> - * - The netfs data from the cookie being used as the target is
> - * presented, as is the auxiliary data
> - */
> -static
> -enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
> - const void *data,
> - uint16_t datalen,
> - loff_t object_size)
> -{
> - struct nfs_fscache_inode_auxdata auxdata;
> - struct nfs_inode *nfsi = cookie_netfs_data;
> -
> - if (datalen != sizeof(auxdata))
> - return FSCACHE_CHECKAUX_OBSOLETE;
> -
> - memset(&auxdata, 0, sizeof(auxdata));
> - auxdata.mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
> - auxdata.mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
> - auxdata.ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
> - auxdata.ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
> -
> - if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
> - auxdata.change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
> -
> - if (memcmp(data, &auxdata, datalen) != 0)
> - return FSCACHE_CHECKAUX_OBSOLETE;
> -
> - return FSCACHE_CHECKAUX_OKAY;
> -}
> -
> -/*
> - * Get an extra reference on a read context.
> - * - This function can be absent if the completion function doesn't require a
> - * context.
> - * - The read context is passed back to NFS in the event that a data read on the
> - * cache fails with EIO - in which case the server must be contacted to
> - * retrieve the data, which requires the read context for security.
> - */
> -static void nfs_fh_get_context(void *cookie_netfs_data, void *context)
> -{
> - get_nfs_open_context(context);
> -}
> -
> -/*
> - * Release an extra reference on a read context.
> - * - This function can be absent if the completion function doesn't require a
> - * context.
> - */
> -static void nfs_fh_put_context(void *cookie_netfs_data, void *context)
> -{
> - if (context)
> - put_nfs_open_context(context);
> -}
> -
> -/*
> - * Define the inode object for FS-Cache. This is used to describe an inode
> - * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for
> - * an inode.
> - *
> - * Coherency is managed by comparing the copies of i_size, i_mtime and i_ctime
> - * held in the cache auxiliary data for the data storage object with those in
> - * the inode struct in memory.
> - */
> -const struct fscache_cookie_def nfs_fscache_inode_object_def = {
> - .name = "NFS.fh",
> - .type = FSCACHE_COOKIE_TYPE_DATAFILE,
> - .check_aux = nfs_fscache_inode_check_aux,
> - .get_context = nfs_fh_get_context,
> - .put_context = nfs_fh_put_context,
> -};
> diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
> index d743629e05e1..fac6438477a0 100644
> --- a/fs/nfs/fscache.c
> +++ b/fs/nfs/fscache.c
> @@ -22,24 +22,18 @@
>
> #define NFSDBG_FACILITY NFSDBG_FSCACHE
>
> -static struct rb_root nfs_fscache_keys = RB_ROOT;
> -static DEFINE_SPINLOCK(nfs_fscache_keys_lock);
> +#define NFS_MAX_KEY_LEN 1000
>
> -/*
> - * Layout of the key for an NFS server cache object.
> - */
> -struct nfs_server_key {
> - struct {
> - uint16_t nfsversion; /* NFS protocol version */
> - uint32_t minorversion; /* NFSv4 minor version */
> - uint16_t family; /* address family */
> - __be16 port; /* IP port */
> - } hdr;
> - union {
> - struct in_addr ipv4_addr; /* IPv4 address */
> - struct in6_addr ipv6_addr; /* IPv6 address */
> - };
> -} __packed;
> +static bool nfs_append_int(char *key, int *_len, unsigned long long x)
> +{
> + if (*_len > NFS_MAX_KEY_LEN)
> + return false;
> + if (x == 0)
> + key[(*_len)++] = ',';
> + else
> + *_len += sprintf(key + *_len, ",%llx", x);
> + return true;
> +}
>
> /*
> * Get the per-client index cookie for an NFS client if the appropriate mount
> @@ -47,160 +41,108 @@ struct nfs_server_key {
> * - We always try and get an index cookie for the client, but get filehandle
> * cookies on a per-superblock basis, depending on the mount flags
> */
> -void nfs_fscache_get_client_cookie(struct nfs_client *clp)
> +static bool nfs_fscache_get_client_key(struct nfs_client *clp,
> + char *key, int *_len)
> {
> const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &clp->cl_addr;
> const struct sockaddr_in *sin = (struct sockaddr_in *) &clp->cl_addr;
> - struct nfs_server_key key;
> - uint16_t len = sizeof(key.hdr);
>
> - memset(&key, 0, sizeof(key));
> - key.hdr.nfsversion = clp->rpc_ops->version;
> - key.hdr.minorversion = clp->cl_minorversion;
> - key.hdr.family = clp->cl_addr.ss_family;
> + *_len += snprintf(key + *_len, NFS_MAX_KEY_LEN - *_len,
> + ",%u.%u,%x",
> + clp->rpc_ops->version,
> + clp->cl_minorversion,
> + clp->cl_addr.ss_family);
>
> switch (clp->cl_addr.ss_family) {
> case AF_INET:
> - key.hdr.port = sin->sin_port;
> - key.ipv4_addr = sin->sin_addr;
> - len += sizeof(key.ipv4_addr);
> - break;
> + if (!nfs_append_int(key, _len, sin->sin_port) ||
> + !nfs_append_int(key, _len, sin->sin_addr.s_addr))
> + return false;
> + return true;
>
> case AF_INET6:
> - key.hdr.port = sin6->sin6_port;
> - key.ipv6_addr = sin6->sin6_addr;
> - len += sizeof(key.ipv6_addr);
> - break;
> + if (!nfs_append_int(key, _len, sin6->sin6_port) ||
> + !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[0]) ||
> + !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[1]) ||
> + !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[2]) ||
> + !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[3]))
> + return false;
> + return true;
>
> default:
> printk(KERN_WARNING "NFS: Unknown network family '%d'\n",
> clp->cl_addr.ss_family);
> - clp->fscache = NULL;
> - return;
> + return false;
> }
> -
> - /* create a cache index for looking up filehandles */
> - clp->fscache = fscache_acquire_cookie(nfs_fscache_netfs.primary_index,
> - &nfs_fscache_server_index_def,
> - &key, len,
> - NULL, 0,
> - clp, 0, true);
> - dfprintk(FSCACHE, "NFS: get client cookie (0x%p/0x%p)\n",
> - clp, clp->fscache);
> -}
> -
> -/*
> - * Dispose of a per-client cookie
> - */
> -void nfs_fscache_release_client_cookie(struct nfs_client *clp)
> -{
> - dfprintk(FSCACHE, "NFS: releasing client cookie (0x%p/0x%p)\n",
> - clp, clp->fscache);
> -
> - fscache_relinquish_cookie(clp->fscache, NULL, false);
> - clp->fscache = NULL;
> }
>
> /*
> - * Get the cache cookie for an NFS superblock. We have to handle
> - * uniquification here because the cache doesn't do it for us.
> + * Get the cache cookie for an NFS superblock.
> *
> * The default uniquifier is just an empty string, but it may be overridden
> * either by the 'fsc=xxx' option to mount, or by inheriting it from the parent
> * superblock across an automount point of some nature.
> */
> -void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int ulen)
> +int nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int ulen)
> {
> - struct nfs_fscache_key *key, *xkey;
> + struct fscache_volume *vcookie;
> struct nfs_server *nfss = NFS_SB(sb);
> - struct rb_node **p, *parent;
> - int diff;
> + unsigned int len = 3;
> + char *key;
>
> - nfss->fscache_key = NULL;
> - nfss->fscache = NULL;
> - if (!uniq) {
> - uniq = "";
> - ulen = 1;
> + if (uniq) {
> + nfss->fscache_uniq = kmemdup_nul(uniq, ulen, GFP_KERNEL);
> + if (!nfss->fscache_uniq)
> + return -ENOMEM;
> }
>
> - key = kzalloc(sizeof(*key) + ulen, GFP_KERNEL);
> + key = kmalloc(NFS_MAX_KEY_LEN + 24, GFP_KERNEL);
> if (!key)
> - return;
> -
> - key->nfs_client = nfss->nfs_client;
> - key->key.super.s_flags = sb->s_flags & NFS_SB_MASK;
> - key->key.nfs_server.flags = nfss->flags;
> - key->key.nfs_server.rsize = nfss->rsize;
> - key->key.nfs_server.wsize = nfss->wsize;
> - key->key.nfs_server.acregmin = nfss->acregmin;
> - key->key.nfs_server.acregmax = nfss->acregmax;
> - key->key.nfs_server.acdirmin = nfss->acdirmin;
> - key->key.nfs_server.acdirmax = nfss->acdirmax;
> - key->key.nfs_server.fsid = nfss->fsid;
> - key->key.rpc_auth.au_flavor = nfss->client->cl_auth->au_flavor;
> -
> - key->key.uniq_len = ulen;
> - memcpy(key->key.uniquifier, uniq, ulen);
> -
> - spin_lock(&nfs_fscache_keys_lock);
> - p = &nfs_fscache_keys.rb_node;
> - parent = NULL;
> - while (*p) {
> - parent = *p;
> - xkey = rb_entry(parent, struct nfs_fscache_key, node);
> -
> - if (key->nfs_client < xkey->nfs_client)
> - goto go_left;
> - if (key->nfs_client > xkey->nfs_client)
> - goto go_right;
> -
> - diff = memcmp(&key->key, &xkey->key, sizeof(key->key));
> - if (diff < 0)
> - goto go_left;
> - if (diff > 0)
> - goto go_right;
> -
> - if (key->key.uniq_len == 0)
> - goto non_unique;
> - diff = memcmp(key->key.uniquifier,
> - xkey->key.uniquifier,
> - key->key.uniq_len);
> - if (diff < 0)
> - goto go_left;
> - if (diff > 0)
> - goto go_right;
> - goto non_unique;
> -
> - go_left:
> - p = &(*p)->rb_left;
> - continue;
> - go_right:
> - p = &(*p)->rb_right;
> + return -ENOMEM;
> +
> + memcpy(key, "nfs", 3);
> + if (!nfs_fscache_get_client_key(nfss->nfs_client, key, &len) ||
> + !nfs_append_int(key, &len, nfss->fsid.major) ||
> + !nfs_append_int(key, &len, nfss->fsid.minor) ||
> + !nfs_append_int(key, &len, sb->s_flags & NFS_SB_MASK) ||
> + !nfs_append_int(key, &len, nfss->flags) ||
> + !nfs_append_int(key, &len, nfss->rsize) ||
> + !nfs_append_int(key, &len, nfss->wsize) ||
> + !nfs_append_int(key, &len, nfss->acregmin) ||
> + !nfs_append_int(key, &len, nfss->acregmax) ||
> + !nfs_append_int(key, &len, nfss->acdirmin) ||
> + !nfs_append_int(key, &len, nfss->acdirmax) ||
> + !nfs_append_int(key, &len, nfss->client->cl_auth->au_flavor))
> + goto out;
> +
> + if (ulen > 0) {
> + if (ulen > NFS_MAX_KEY_LEN - len)
> + goto out;
> + key[len++] = ',';
> + memcpy(key + len, uniq, ulen);
> + len += ulen;
> }
> -
> - rb_link_node(&key->node, parent, p);
> - rb_insert_color(&key->node, &nfs_fscache_keys);
> - spin_unlock(&nfs_fscache_keys_lock);
> - nfss->fscache_key = key;
> + key[len] = 0;
>
> /* create a cache index for looking up filehandles */
> - nfss->fscache = fscache_acquire_cookie(nfss->nfs_client->fscache,
> - &nfs_fscache_super_index_def,
> - &key->key,
> - sizeof(key->key) + ulen,
> - NULL, 0,
> - nfss, 0, true);
> + vcookie = fscache_acquire_volume(key,
> + NULL, /* preferred_cache */
> + NULL, 0 /* coherency_data */);
> dfprintk(FSCACHE, "NFS: get superblock cookie (0x%p/0x%p)\n",
> - nfss, nfss->fscache);
> - return;
> + nfss, vcookie);
> + if (IS_ERR(vcookie)) {
> + if (vcookie != ERR_PTR(-EBUSY)) {
> + kfree(key);
> + return PTR_ERR(vcookie);
> + }
> + pr_err("NFS: Cache volume key already in use (%s)\n", key);
> + vcookie = NULL;
> + }
> + nfss->fscache = vcookie;
>
> -non_unique:
> - spin_unlock(&nfs_fscache_keys_lock);
> +out:
> kfree(key);
> - nfss->fscache_key = NULL;
> - nfss->fscache = NULL;
> - printk(KERN_WARNING "NFS:"
> - " Cache request denied due to non-unique superblock keys\n");
> + return 0;
> }
>
> /*
> @@ -213,29 +155,9 @@ void nfs_fscache_release_super_cookie(struct super_block *sb)
> dfprintk(FSCACHE, "NFS: releasing superblock cookie (0x%p/0x%p)\n",
> nfss, nfss->fscache);
>
> - fscache_relinquish_cookie(nfss->fscache, NULL, false);
> + fscache_relinquish_volume(nfss->fscache, NULL, false);
> nfss->fscache = NULL;
> -
> - if (nfss->fscache_key) {
> - spin_lock(&nfs_fscache_keys_lock);
> - rb_erase(&nfss->fscache_key->node, &nfs_fscache_keys);
> - spin_unlock(&nfs_fscache_keys_lock);
> - kfree(nfss->fscache_key);
> - nfss->fscache_key = NULL;
> - }
> -}
> -
> -static void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata,
> - struct nfs_inode *nfsi)
> -{
> - memset(auxdata, 0, sizeof(*auxdata));
> - auxdata->mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
> - auxdata->mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
> - auxdata->ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
> - auxdata->ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
> -
> - if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
> - auxdata->change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
> + kfree(nfss->fscache_uniq);
> }
>
> /*
> @@ -254,10 +176,12 @@ void nfs_fscache_init_inode(struct inode *inode)
> nfs_fscache_update_auxdata(&auxdata, nfsi);
>
> nfsi->fscache = fscache_acquire_cookie(NFS_SB(inode->i_sb)->fscache,
> - &nfs_fscache_inode_object_def,
> - nfsi->fh.data, nfsi->fh.size,
> - &auxdata, sizeof(auxdata),
> - nfsi, nfsi->vfs_inode.i_size, false);
> + 0,
> + nfsi->fh.data, /* index_key */
> + nfsi->fh.size,
> + &auxdata, /* aux_data */
> + sizeof(auxdata),
> + i_size_read(&nfsi->vfs_inode));
> }
>
> /*
> @@ -265,24 +189,15 @@ void nfs_fscache_init_inode(struct inode *inode)
> */
> void nfs_fscache_clear_inode(struct inode *inode)
> {
> - struct nfs_fscache_inode_auxdata auxdata;
> struct nfs_inode *nfsi = NFS_I(inode);
> struct fscache_cookie *cookie = nfs_i_fscache(inode);
>
> dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n", nfsi, cookie);
>
> - nfs_fscache_update_auxdata(&auxdata, nfsi);
> - fscache_relinquish_cookie(cookie, &auxdata, false);
> + fscache_relinquish_cookie(cookie, false);
> nfsi->fscache = NULL;
> }
>
> -static bool nfs_fscache_can_enable(void *data)
> -{
> - struct inode *inode = data;
> -
> - return !inode_is_open_for_write(inode);
> -}
> -
> /*
> * Enable or disable caching for a file that is being opened as appropriate.
> * The cookie is allocated when the inode is initialised, but is not enabled at
> @@ -307,93 +222,31 @@ void nfs_fscache_open_file(struct inode *inode, struct file *filp)
> struct nfs_fscache_inode_auxdata auxdata;
> struct nfs_inode *nfsi = NFS_I(inode);
> struct fscache_cookie *cookie = nfs_i_fscache(inode);
> + bool open_for_write = inode_is_open_for_write(inode);
>
> if (!fscache_cookie_valid(cookie))
> return;
>
> - nfs_fscache_update_auxdata(&auxdata, nfsi);
> -
> - if (inode_is_open_for_write(inode)) {
> + fscache_use_cookie(cookie, open_for_write);
> + if (open_for_write) {
> dfprintk(FSCACHE, "NFS: nfsi 0x%p disabling cache\n", nfsi);
> - clear_bit(NFS_INO_FSCACHE, &nfsi->flags);
> - fscache_disable_cookie(cookie, &auxdata, true);
> - fscache_uncache_all_inode_pages(cookie, inode);
> - } else {
> - dfprintk(FSCACHE, "NFS: nfsi 0x%p enabling cache\n", nfsi);
> - fscache_enable_cookie(cookie, &auxdata, nfsi->vfs_inode.i_size,
> - nfs_fscache_can_enable, inode);
> - if (fscache_cookie_enabled(cookie))
> - set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
> + nfs_fscache_update_auxdata(&auxdata, nfsi);
> + fscache_invalidate(cookie, &auxdata, i_size_read(inode),
> + FSCACHE_INVAL_DIO_WRITE);
> }
> }
> EXPORT_SYMBOL_GPL(nfs_fscache_open_file);
>
> -/*
> - * Release the caching state associated with a page, if the page isn't busy
> - * interacting with the cache.
> - * - Returns true (can release page) or false (page busy).
> - */
> -int nfs_fscache_release_page(struct page *page, gfp_t gfp)
> -{
> - if (PageFsCache(page)) {
> - struct fscache_cookie *cookie = nfs_i_fscache(page->mapping->host);
> -
> - BUG_ON(!cookie);
> - dfprintk(FSCACHE, "NFS: fscache releasepage (0x%p/0x%p/0x%p)\n",
> - cookie, page, NFS_I(page->mapping->host));
> -
> - if (!fscache_maybe_release_page(cookie, page, gfp))
> - return 0;
> -
> - nfs_inc_fscache_stats(page->mapping->host,
> - NFSIOS_FSCACHE_PAGES_UNCACHED);
> - }
> -
> - return 1;
> -}
> -
> -/*
> - * Release the caching state associated with a page if undergoing complete page
> - * invalidation.
> - */
> -void __nfs_fscache_invalidate_page(struct page *page, struct inode *inode)
> +void nfs_fscache_release_file(struct inode *inode, struct file *filp)
> {
> + struct nfs_fscache_inode_auxdata auxdata;
> + struct nfs_inode *nfsi = NFS_I(inode);
> struct fscache_cookie *cookie = nfs_i_fscache(inode);
>
> - BUG_ON(!cookie);
> -
> - dfprintk(FSCACHE, "NFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
> - cookie, page, NFS_I(inode));
> -
> - fscache_wait_on_page_write(cookie, page);
> -
> - BUG_ON(!PageLocked(page));
> - fscache_uncache_page(cookie, page);
> - nfs_inc_fscache_stats(page->mapping->host,
> - NFSIOS_FSCACHE_PAGES_UNCACHED);
> -}
> -
> -/*
> - * Handle completion of a page being read from the cache.
> - * - Called in process (keventd) context.
> - */
> -static void nfs_readpage_from_fscache_complete(struct page *page,
> - void *context,
> - int error)
> -{
> - dfprintk(FSCACHE,
> - "NFS: readpage_from_fscache_complete (0x%p/0x%p/%d)\n",
> - page, context, error);
> -
> - /*
> - * If the read completes with an error, mark the page with PG_checked,
> - * unlock the page, and let the VM reissue the readpage.
> - */
> - if (!error)
> - SetPageUptodate(page);
> - else
> - SetPageChecked(page);
> - unlock_page(page);
> + if (fscache_cookie_valid(cookie)) {
> + nfs_fscache_update_auxdata(&auxdata, nfsi);
> + fscache_unuse_cookie(cookie, &auxdata, NULL);
> + }
> }
>
> /*
> @@ -402,8 +255,6 @@ static void nfs_readpage_from_fscache_complete(struct page *page,
> int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
> struct inode *inode, struct page *page)
> {
> - int ret;
> -
> dfprintk(FSCACHE,
> "NFS: readpage_from_fscache(fsc:%p/p:%p(i:%lx f:%lx)/0x%p)\n",
> nfs_i_fscache(inode), page, page->index, page->flags, inode);
> @@ -413,31 +264,7 @@ int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
> return 1;
> }
>
> - ret = fscache_read_or_alloc_page(nfs_i_fscache(inode),
> - page,
> - nfs_readpage_from_fscache_complete,
> - ctx,
> - GFP_KERNEL);
> -
> - switch (ret) {
> - case 0: /* read BIO submitted (page in fscache) */
> - dfprintk(FSCACHE,
> - "NFS: readpage_from_fscache: BIO submitted\n");
> - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK);
> - return ret;
> -
> - case -ENOBUFS: /* inode not in cache */
> - case -ENODATA: /* page not in cache */
> - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL);
> - dfprintk(FSCACHE,
> - "NFS: readpage_from_fscache %d\n", ret);
> - return 1;
> -
> - default:
> - dfprintk(FSCACHE, "NFS: readpage_from_fscache %d\n", ret);
> - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL);
> - }
> - return ret;
> + return -ENOBUFS; // TODO: Use netfslib
> }
>
> /*
> @@ -449,45 +276,10 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
> struct list_head *pages,
> unsigned *nr_pages)
> {
> - unsigned npages = *nr_pages;
> - int ret;
> -
> dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n",
> - nfs_i_fscache(inode), npages, inode);
> -
> - ret = fscache_read_or_alloc_pages(nfs_i_fscache(inode),
> - mapping, pages, nr_pages,
> - nfs_readpage_from_fscache_complete,
> - ctx,
> - mapping_gfp_mask(mapping));
> - if (*nr_pages < npages)
> - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK,
> - npages);
> - if (*nr_pages > 0)
> - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL,
> - *nr_pages);
> -
> - switch (ret) {
> - case 0: /* read submitted to the cache for all pages */
> - BUG_ON(!list_empty(pages));
> - BUG_ON(*nr_pages != 0);
> - dfprintk(FSCACHE,
> - "NFS: nfs_getpages_from_fscache: submitted\n");
> -
> - return ret;
> -
> - case -ENOBUFS: /* some pages aren't cached and can't be */
> - case -ENODATA: /* some pages aren't cached */
> - dfprintk(FSCACHE,
> - "NFS: nfs_getpages_from_fscache: no page: %d\n", ret);
> - return 1;
> + nfs_i_fscache(inode), *nr_pages, inode);
>
> - default:
> - dfprintk(FSCACHE,
> - "NFS: nfs_getpages_from_fscache: ret %d\n", ret);
> - }
> -
> - return ret;
> + return -ENOBUFS; // TODO: Use netfslib
> }
>
> /*
> @@ -496,25 +288,9 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
> */
> void __nfs_readpage_to_fscache(struct inode *inode, struct page *page, int sync)
> {
> - int ret;
> -
> dfprintk(FSCACHE,
> "NFS: readpage_to_fscache(fsc:%p/p:%p(i:%lx f:%lx)/%d)\n",
> nfs_i_fscache(inode), page, page->index, page->flags, sync);
>
> - ret = fscache_write_page(nfs_i_fscache(inode), page,
> - inode->i_size, GFP_KERNEL);
> - dfprintk(FSCACHE,
> - "NFS: readpage_to_fscache: p:%p(i:%lu f:%lx) ret %d\n",
> - page, page->index, page->flags, ret);
> -
> - if (ret != 0) {
> - fscache_uncache_page(nfs_i_fscache(inode), page);
> - nfs_inc_fscache_stats(inode,
> - NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL);
> - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED);
> - } else {
> - nfs_inc_fscache_stats(inode,
> - NFSIOS_FSCACHE_PAGES_WRITTEN_OK);
> - }
> + return; // TODO: Use netfslib
> }
> diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
> index 6754c8607230..0fa267243d26 100644
> --- a/fs/nfs/fscache.h
> +++ b/fs/nfs/fscache.h
> @@ -12,46 +12,10 @@
> #include <linux/nfs_mount.h>
> #include <linux/nfs4_mount.h>
> #include <linux/fscache.h>
> +#include <linux/iversion.h>
>
> #ifdef CONFIG_NFS_FSCACHE
>
> -/*
> - * set of NFS FS-Cache objects that form a superblock key
> - */
> -struct nfs_fscache_key {
> - struct rb_node node;
> - struct nfs_client *nfs_client; /* the server */
> -
> - /* the elements of the unique key - as used by nfs_compare_super() and
> - * nfs_compare_mount_options() to distinguish superblocks */
> - struct {
> - struct {
> - unsigned long s_flags; /* various flags
> - * (& NFS_MS_MASK) */
> - } super;
> -
> - struct {
> - struct nfs_fsid fsid;
> - int flags;
> - unsigned int rsize; /* read size */
> - unsigned int wsize; /* write size */
> - unsigned int acregmin; /* attr cache timeouts */
> - unsigned int acregmax;
> - unsigned int acdirmin;
> - unsigned int acdirmax;
> - } nfs_server;
> -
> - struct {
> - rpc_authflavor_t au_flavor;
> - } rpc_auth;
> -
> - /* uniquifier - can be used if nfs_server.flags includes
> - * NFS_MOUNT_UNSHARED */
> - u8 uniq_len;
> - char uniquifier[0];
> - } key;
> -};
> -
> /*
> * Definition of the auxiliary data attached to NFS inode storage objects
> * within the cache.
> @@ -69,32 +33,18 @@ struct nfs_fscache_inode_auxdata {
> u64 change_attr;
> };
>
> -/*
> - * fscache-index.c
> - */
> -extern struct fscache_netfs nfs_fscache_netfs;
> -extern const struct fscache_cookie_def nfs_fscache_server_index_def;
> -extern const struct fscache_cookie_def nfs_fscache_super_index_def;
> -extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
> -
> -extern int nfs_fscache_register(void);
> -extern void nfs_fscache_unregister(void);
> -
> /*
> * fscache.c
> */
> -extern void nfs_fscache_get_client_cookie(struct nfs_client *);
> -extern void nfs_fscache_release_client_cookie(struct nfs_client *);
> -
> -extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
> +extern int nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
> extern void nfs_fscache_release_super_cookie(struct super_block *);
>
> extern void nfs_fscache_init_inode(struct inode *);
> extern void nfs_fscache_clear_inode(struct inode *);
> extern void nfs_fscache_open_file(struct inode *, struct file *);
> +extern void nfs_fscache_release_file(struct inode *, struct file *);
>
> extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
> -extern int nfs_fscache_release_page(struct page *, gfp_t);
>
> extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
> struct inode *, struct page *);
> @@ -103,25 +53,17 @@ extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
> struct list_head *, unsigned *);
> extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
>
> -/*
> - * wait for a page to complete writing to the cache
> - */
> -static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
> - struct page *page)
> -{
> - if (PageFsCache(page))
> - fscache_wait_on_page_write(nfsi->fscache, page);
> -}
> -
> -/*
> - * release the caching state associated with a page if undergoing complete page
> - * invalidation
> - */
> -static inline void nfs_fscache_invalidate_page(struct page *page,
> - struct inode *inode)
> +static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
> {
> - if (PageFsCache(page))
> - __nfs_fscache_invalidate_page(page, inode);
> + if (PageFsCache(page)) {
> + if (!gfpflags_allow_blocking(gfp) || !(gfp & __GFP_FS))
> + return false;
> + wait_on_page_fscache(page);
> + fscache_note_page_release(nfs_i_fscache(page->mapping->host));
> + nfs_inc_fscache_stats(page->mapping->host,
> + NFSIOS_FSCACHE_PAGES_UNCACHED);
> + }
> + return true;
> }
>
> /*
> @@ -163,20 +105,32 @@ static inline void nfs_readpage_to_fscache(struct inode *inode,
> __nfs_readpage_to_fscache(inode, page, sync);
> }
>
> -/*
> - * Invalidate the contents of fscache for this inode. This will not sleep.
> - */
> -static inline void nfs_fscache_invalidate(struct inode *inode)
> +static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata,
> + struct nfs_inode *nfsi)
> {
> - fscache_invalidate(NFS_I(inode)->fscache);
> + memset(auxdata, 0, sizeof(*auxdata));
> + auxdata->mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
> + auxdata->mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
> + auxdata->ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
> + auxdata->ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
> +
> + if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
> + auxdata->change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
> }
>
> /*
> - * Wait for an object to finish being invalidated.
> + * Invalidate the contents of fscache for this inode. This will not sleep.
> */
> -static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
> +static inline void nfs_fscache_invalidate(struct inode *inode, int flags)
> {
> - fscache_wait_on_invalidate(NFS_I(inode)->fscache);
> + struct nfs_fscache_inode_auxdata auxdata;
> + struct nfs_inode *nfsi = NFS_I(inode);
> +
> + if (nfsi->fscache) {
> + nfs_fscache_update_auxdata(&auxdata, nfsi);
> + fscache_invalidate(nfsi->fscache, &auxdata,
> + i_size_read(&nfsi->vfs_inode), flags);
> + }
> }
>
> /*
> @@ -190,28 +144,18 @@ static inline const char *nfs_server_fscache_state(struct nfs_server *server)
> }
>
> #else /* CONFIG_NFS_FSCACHE */
> -static inline int nfs_fscache_register(void) { return 0; }
> -static inline void nfs_fscache_unregister(void) {}
> -
> -static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
> -static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
> -
> static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
>
> static inline void nfs_fscache_init_inode(struct inode *inode) {}
> static inline void nfs_fscache_clear_inode(struct inode *inode) {}
> static inline void nfs_fscache_open_file(struct inode *inode,
> struct file *filp) {}
> +static inline void nfs_fscache_release_file(struct inode *inode, struct file *file) {}
>
> static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
> {
> return 1; /* True: may release page */
> }
> -static inline void nfs_fscache_invalidate_page(struct page *page,
> - struct inode *inode) {}
> -static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
> - struct page *page) {}
> -
> static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
> struct inode *inode,
> struct page *page)
> @@ -230,8 +174,7 @@ static inline void nfs_readpage_to_fscache(struct inode *inode,
> struct page *page, int sync) {}
>
>
> -static inline void nfs_fscache_invalidate(struct inode *inode) {}
> -static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
> +static inline void nfs_fscache_invalidate(struct inode *inode, int flags) {}
>
> static inline const char *nfs_server_fscache_state(struct nfs_server *server)
> {
> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
> index fda530d5e764..a918c3a834b6 100644
> --- a/fs/nfs/inode.c
> +++ b/fs/nfs/inode.c
> @@ -209,7 +209,7 @@ void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
> if (!nfs_has_xattr_cache(nfsi))
> flags &= ~NFS_INO_INVALID_XATTR;
> if (flags & NFS_INO_INVALID_DATA)
> - nfs_fscache_invalidate(inode);
> + nfs_fscache_invalidate(inode, 0);
> flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
>
> nfsi->cache_validity |= flags;
> @@ -1289,6 +1289,7 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
> {
> int ret;
>
> + nfs_fscache_invalidate(inode, 0);
> if (mapping->nrpages != 0) {
> if (S_ISREG(inode->i_mode)) {
> ret = nfs_sync_mapping(mapping);
> @@ -1300,7 +1301,6 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
> return ret;
> }
> nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
> - nfs_fscache_wait_on_invalidate(inode);
>
> dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
> inode->i_sb->s_id,
> @@ -2374,10 +2374,6 @@ static int __init init_nfs_fs(void)
> if (err < 0)
> goto out9;
>
> - err = nfs_fscache_register();
> - if (err < 0)
> - goto out8;
> -
> err = nfsiod_start();
> if (err)
> goto out7;
> @@ -2429,8 +2425,6 @@ static int __init init_nfs_fs(void)
> out6:
> nfsiod_stop();
> out7:
> - nfs_fscache_unregister();
> -out8:
> unregister_pernet_subsys(&nfs_net_ops);
> out9:
> nfs_sysfs_exit();
> @@ -2445,7 +2439,6 @@ static void __exit exit_nfs_fs(void)
> nfs_destroy_readpagecache();
> nfs_destroy_inodecache();
> nfs_destroy_nfspagecache();
> - nfs_fscache_unregister();
> unregister_pernet_subsys(&nfs_net_ops);
> rpc_proc_unregister(&init_net, "nfs");
> unregister_nfs_fs();
> diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
> index b3aee261801e..317ce27bdc4b 100644
> --- a/fs/nfs/nfstrace.h
> +++ b/fs/nfs/nfstrace.h
> @@ -42,7 +42,6 @@
> { BIT(NFS_INO_ACL_LRU_SET), "ACL_LRU_SET" }, \
> { BIT(NFS_INO_INVALIDATING), "INVALIDATING" }, \
> { BIT(NFS_INO_FSCACHE), "FSCACHE" }, \
> - { BIT(NFS_INO_FSCACHE_LOCK), "FSCACHE_LOCK" }, \
> { BIT(NFS_INO_LAYOUTCOMMIT), "NEED_LAYOUTCOMMIT" }, \
> { BIT(NFS_INO_LAYOUTCOMMITTING), "LAYOUTCOMMIT" }, \
> { BIT(NFS_INO_LAYOUTSTATS), "LAYOUTSTATS" }, \
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index 3aced401735c..6ab5eeb000dc 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -1204,42 +1204,42 @@ static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
> }
>
> #ifdef CONFIG_NFS_FSCACHE
> -static void nfs_get_cache_cookie(struct super_block *sb,
> - struct nfs_fs_context *ctx)
> +static int nfs_get_cache_cookie(struct super_block *sb,
> + struct nfs_fs_context *ctx)
> {
> struct nfs_server *nfss = NFS_SB(sb);
> char *uniq = NULL;
> int ulen = 0;
>
> - nfss->fscache_key = NULL;
> nfss->fscache = NULL;
>
> if (!ctx)
> - return;
> + return 0;
>
> if (ctx->clone_data.sb) {
> struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
> if (!(mnt_s->options & NFS_OPTION_FSCACHE))
> - return;
> - if (mnt_s->fscache_key) {
> - uniq = mnt_s->fscache_key->key.uniquifier;
> - ulen = mnt_s->fscache_key->key.uniq_len;
> + return 0;
> + if (mnt_s->fscache_uniq) {
> + uniq = mnt_s->fscache_uniq;
> + ulen = strlen(uniq);
> }
> } else {
> if (!(ctx->options & NFS_OPTION_FSCACHE))
> - return;
> + return 0;
> if (ctx->fscache_uniq) {
> uniq = ctx->fscache_uniq;
> ulen = strlen(ctx->fscache_uniq);
> }
> }
>
> - nfs_fscache_get_super_cookie(sb, uniq, ulen);
> + return nfs_fscache_get_super_cookie(sb, uniq, ulen);
> }
> #else
> -static void nfs_get_cache_cookie(struct super_block *sb,
> - struct nfs_fs_context *ctx)
> +static int nfs_get_cache_cookie(struct super_block *sb,
> + struct nfs_fs_context *ctx)
> {
> + return 0;
> }
> #endif
>
> @@ -1299,7 +1299,9 @@ int nfs_get_tree_common(struct fs_context *fc)
> s->s_blocksize_bits = bsize;
> s->s_blocksize = 1U << bsize;
> }
> - nfs_get_cache_cookie(s, ctx);
> + error = nfs_get_cache_cookie(s, ctx);
> + if (error < 0)
> + goto error_splat_super;
> }
>
> error = nfs_get_root(s, fc);
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 9b7619ce17a7..2b322170372a 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -294,6 +294,7 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c
> nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
> out:
> spin_unlock(&inode->i_lock);
> + nfs_fscache_invalidate(inode, 0);
> }
>
> /* A writeback failed: mark the page as bad, and invalidate the page cache */
> diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
> index 05f249f20f55..00835bacd236 100644
> --- a/include/linux/nfs_fs.h
> +++ b/include/linux/nfs_fs.h
> @@ -275,7 +275,6 @@ struct nfs4_copy_state {
> #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
> #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
> #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
> -#define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
> #define NFS_INO_FORCE_READDIR (7) /* force readdirplus */
> #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
> #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
> index 2a9acbfe00f0..77b2dba27bbb 100644
> --- a/include/linux/nfs_fs_sb.h
> +++ b/include/linux/nfs_fs_sb.h
> @@ -120,11 +120,6 @@ struct nfs_client {
> * This is used to generate the mv0 callback address.
> */
> char cl_ipaddr[48];
> -
> -#ifdef CONFIG_NFS_FSCACHE
> - struct fscache_cookie *fscache; /* client index cache cookie */
> -#endif
> -
> struct net *cl_net;
> struct list_head pending_cb_stateids;
> };
> @@ -194,8 +189,8 @@ struct nfs_server {
> struct nfs_auth_info auth_info; /* parsed auth flavors */
>
> #ifdef CONFIG_NFS_FSCACHE
> - struct nfs_fscache_key *fscache_key; /* unique key for superblock */
> - struct fscache_cookie *fscache; /* superblock cookie */
> + struct fscache_volume *fscache; /* superblock cookie */
> + char *fscache_uniq; /* Uniquifier (or NULL) */
> #endif
>
> u32 pnfs_blksize; /* layout_blksize attr */
>
>
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