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![David Howells](/assets/img/avatar_default.png)
Change the afs filesystem to support the new afs driver. 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. There's also no longer a cell cookie. (2) The volume cookie is now an fscache_volume cookie, allocated with fscache_acquire_volume(). This function 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 afs, I've made it render the volume name string as: "afs,<cell>,<volume_id>" and the coherency data is currently 0. (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, except that these are now stored in big endian form instead of cpu endian. This makes the cache more copyable. (4) fscache_use_cookie() and fscache_unuse_cookie() are called 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. fscache_use_cookie() is given an indication if the cache is likely to be modified locally (e.g. the file is open for writing). fscache_unuse_cookie() is given a coherency update if we had the file open for writing and will update that. (5) fscache_invalidate() is now given uptodate auxiliary data and a file size. It can also take a flag to indicate if this was due to a DIO write. This is wrapped into afs_fscache_invalidate() now for convenience. (6) fscache_resize() now gets called from the finalisation of afs_setattr(), and afs_setattr() does use/unuse of the cookie around the call to support this. (7) fscache_note_page_release() is called from afs_release_page(). (8) Use a killable wait in nfs_vm_page_mkwrite() when waiting for PG_fscache to be cleared. Render the parts of the cookie key for an afs inode cookie as big endian. Changes ======= ver #2: - Use gfpflags_allow_blocking() rather than using flag directly. - fscache_acquire_volume() now returns errors. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@kernel.org> Tested-by: kafs-testing@auristor.com cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819661382.215744.1485608824741611837.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906970002.143852.17678518584089878259.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967174665.1823006.1301789965454084220.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021568841.640689.6684240152253400380.stgit@warthog.procyon.org.uk/ # v4
244 lines
6 KiB
C
244 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS client file system
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*
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* Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <linux/random.h>
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#include <linux/proc_fs.h>
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#define CREATE_TRACE_POINTS
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#include "internal.h"
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MODULE_DESCRIPTION("AFS Client File System");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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unsigned afs_debug;
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module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(debug, "AFS debugging mask");
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static char *rootcell;
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module_param(rootcell, charp, 0);
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MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
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struct workqueue_struct *afs_wq;
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static struct proc_dir_entry *afs_proc_symlink;
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#if defined(CONFIG_ALPHA)
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const char afs_init_sysname[] = "alpha_linux26";
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#elif defined(CONFIG_X86_64)
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const char afs_init_sysname[] = "amd64_linux26";
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#elif defined(CONFIG_ARM)
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const char afs_init_sysname[] = "arm_linux26";
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#elif defined(CONFIG_ARM64)
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const char afs_init_sysname[] = "aarch64_linux26";
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#elif defined(CONFIG_X86_32)
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const char afs_init_sysname[] = "i386_linux26";
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#elif defined(CONFIG_IA64)
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const char afs_init_sysname[] = "ia64_linux26";
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#elif defined(CONFIG_PPC64)
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const char afs_init_sysname[] = "ppc64_linux26";
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#elif defined(CONFIG_PPC32)
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const char afs_init_sysname[] = "ppc_linux26";
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#elif defined(CONFIG_S390)
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#ifdef CONFIG_64BIT
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const char afs_init_sysname[] = "s390x_linux26";
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#else
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const char afs_init_sysname[] = "s390_linux26";
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#endif
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#elif defined(CONFIG_SPARC64)
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const char afs_init_sysname[] = "sparc64_linux26";
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#elif defined(CONFIG_SPARC32)
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const char afs_init_sysname[] = "sparc_linux26";
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#else
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const char afs_init_sysname[] = "unknown_linux26";
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#endif
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/*
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* Initialise an AFS network namespace record.
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*/
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static int __net_init afs_net_init(struct net *net_ns)
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{
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struct afs_sysnames *sysnames;
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struct afs_net *net = afs_net(net_ns);
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int ret;
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net->net = net_ns;
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net->live = true;
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generate_random_uuid((unsigned char *)&net->uuid);
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INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
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mutex_init(&net->socket_mutex);
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net->cells = RB_ROOT;
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init_rwsem(&net->cells_lock);
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INIT_WORK(&net->cells_manager, afs_manage_cells);
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timer_setup(&net->cells_timer, afs_cells_timer, 0);
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mutex_init(&net->cells_alias_lock);
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mutex_init(&net->proc_cells_lock);
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INIT_HLIST_HEAD(&net->proc_cells);
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seqlock_init(&net->fs_lock);
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net->fs_servers = RB_ROOT;
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INIT_LIST_HEAD(&net->fs_probe_fast);
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INIT_LIST_HEAD(&net->fs_probe_slow);
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INIT_HLIST_HEAD(&net->fs_proc);
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INIT_HLIST_HEAD(&net->fs_addresses4);
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INIT_HLIST_HEAD(&net->fs_addresses6);
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seqlock_init(&net->fs_addr_lock);
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INIT_WORK(&net->fs_manager, afs_manage_servers);
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timer_setup(&net->fs_timer, afs_servers_timer, 0);
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INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
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timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
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atomic_set(&net->servers_outstanding, 1);
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ret = -ENOMEM;
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sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
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if (!sysnames)
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goto error_sysnames;
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sysnames->subs[0] = (char *)&afs_init_sysname;
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sysnames->nr = 1;
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refcount_set(&sysnames->usage, 1);
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net->sysnames = sysnames;
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rwlock_init(&net->sysnames_lock);
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/* Register the /proc stuff */
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ret = afs_proc_init(net);
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if (ret < 0)
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goto error_proc;
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/* Initialise the cell DB */
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ret = afs_cell_init(net, rootcell);
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if (ret < 0)
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goto error_cell_init;
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/* Create the RxRPC transport */
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ret = afs_open_socket(net);
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if (ret < 0)
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goto error_open_socket;
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return 0;
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error_open_socket:
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net->live = false;
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afs_fs_probe_cleanup(net);
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afs_cell_purge(net);
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afs_purge_servers(net);
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error_cell_init:
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net->live = false;
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afs_proc_cleanup(net);
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error_proc:
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afs_put_sysnames(net->sysnames);
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error_sysnames:
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net->live = false;
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return ret;
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}
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/*
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* Clean up and destroy an AFS network namespace record.
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*/
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static void __net_exit afs_net_exit(struct net *net_ns)
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{
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struct afs_net *net = afs_net(net_ns);
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net->live = false;
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afs_fs_probe_cleanup(net);
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afs_cell_purge(net);
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afs_purge_servers(net);
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afs_close_socket(net);
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afs_proc_cleanup(net);
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afs_put_sysnames(net->sysnames);
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}
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static struct pernet_operations afs_net_ops = {
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.init = afs_net_init,
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.exit = afs_net_exit,
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.id = &afs_net_id,
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.size = sizeof(struct afs_net),
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};
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/*
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* initialise the AFS client FS module
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*/
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static int __init afs_init(void)
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{
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int ret = -ENOMEM;
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printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
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afs_wq = alloc_workqueue("afs", 0, 0);
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if (!afs_wq)
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goto error_afs_wq;
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afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
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if (!afs_async_calls)
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goto error_async;
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afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
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if (!afs_lock_manager)
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goto error_lockmgr;
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ret = register_pernet_device(&afs_net_ops);
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if (ret < 0)
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goto error_net;
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/* register the filesystems */
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ret = afs_fs_init();
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if (ret < 0)
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goto error_fs;
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afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
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if (!afs_proc_symlink) {
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ret = -ENOMEM;
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goto error_proc;
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}
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return ret;
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error_proc:
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afs_fs_exit();
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error_fs:
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unregister_pernet_device(&afs_net_ops);
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error_net:
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destroy_workqueue(afs_lock_manager);
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error_lockmgr:
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destroy_workqueue(afs_async_calls);
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error_async:
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destroy_workqueue(afs_wq);
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error_afs_wq:
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rcu_barrier();
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printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
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return ret;
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}
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/* XXX late_initcall is kludgy, but the only alternative seems to create
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* a transport upon the first mount, which is worse. Or is it?
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*/
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late_initcall(afs_init); /* must be called after net/ to create socket */
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/*
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* clean up on module removal
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*/
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static void __exit afs_exit(void)
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{
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printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
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proc_remove(afs_proc_symlink);
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afs_fs_exit();
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unregister_pernet_device(&afs_net_ops);
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destroy_workqueue(afs_lock_manager);
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destroy_workqueue(afs_async_calls);
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destroy_workqueue(afs_wq);
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afs_clean_up_permit_cache();
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rcu_barrier();
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}
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module_exit(afs_exit);
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