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![Vladimir Davydov](/assets/img/avatar_default.png)
Mark those kmem allocations that are known to be easily triggered from userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to memcg. For the list, see below: - threadinfo - task_struct - task_delay_info - pid - cred - mm_struct - vm_area_struct and vm_region (nommu) - anon_vma and anon_vma_chain - signal_struct - sighand_struct - fs_struct - files_struct - fdtable and fdtable->full_fds_bits - dentry and external_name - inode for all filesystems. This is the most tedious part, because most filesystems overwrite the alloc_inode method. The list is far from complete, so feel free to add more objects. Nevertheless, it should be close to "account everything" approach and keep most workloads within bounds. Malevolent users will be able to breach the limit, but this was possible even with the former "account everything" approach (simply because it did not account everything in fact). [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
679 lines
15 KiB
C
679 lines
15 KiB
C
/*
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* linux/fs/9p/v9fs.c
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*
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* This file contains functions assisting in mapping VFS to 9P2000
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*
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "cache.h"
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static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
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static LIST_HEAD(v9fs_sessionlist);
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struct kmem_cache *v9fs_inode_cache;
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/*
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* Option Parsing (code inspired by NFS code)
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* NOTE: each transport will parse its own options
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*/
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enum {
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/* Options that take integer arguments */
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Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
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/* String options */
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Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
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/* Options that take no arguments */
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Opt_nodevmap,
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/* Cache options */
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Opt_cache_loose, Opt_fscache, Opt_mmap,
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/* Access options */
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Opt_access, Opt_posixacl,
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/* Error token */
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Opt_err
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};
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static const match_table_t tokens = {
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{Opt_debug, "debug=%x"},
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{Opt_dfltuid, "dfltuid=%u"},
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{Opt_dfltgid, "dfltgid=%u"},
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{Opt_afid, "afid=%u"},
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{Opt_uname, "uname=%s"},
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{Opt_remotename, "aname=%s"},
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{Opt_nodevmap, "nodevmap"},
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{Opt_cache, "cache=%s"},
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{Opt_cache_loose, "loose"},
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{Opt_fscache, "fscache"},
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{Opt_mmap, "mmap"},
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{Opt_cachetag, "cachetag=%s"},
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{Opt_access, "access=%s"},
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{Opt_posixacl, "posixacl"},
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{Opt_err, NULL}
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};
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/* Interpret mount options for cache mode */
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static int get_cache_mode(char *s)
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{
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int version = -EINVAL;
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if (!strcmp(s, "loose")) {
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version = CACHE_LOOSE;
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p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
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} else if (!strcmp(s, "fscache")) {
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version = CACHE_FSCACHE;
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p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
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} else if (!strcmp(s, "mmap")) {
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version = CACHE_MMAP;
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p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
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} else if (!strcmp(s, "none")) {
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version = CACHE_NONE;
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p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
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} else
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pr_info("Unknown Cache mode %s\n", s);
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return version;
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}
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/**
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* v9fs_parse_options - parse mount options into session structure
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* @v9ses: existing v9fs session information
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*
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* Return 0 upon success, -ERRNO upon failure.
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*/
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static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
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{
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char *options, *tmp_options;
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int option = 0;
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char *s, *e;
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int ret = 0;
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/* setup defaults */
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v9ses->afid = ~0;
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v9ses->debug = 0;
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v9ses->cache = CACHE_NONE;
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#ifdef CONFIG_9P_FSCACHE
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v9ses->cachetag = NULL;
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#endif
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if (!opts)
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return 0;
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tmp_options = kstrdup(opts, GFP_KERNEL);
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if (!tmp_options) {
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ret = -ENOMEM;
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goto fail_option_alloc;
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}
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options = tmp_options;
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while ((p = strsep(&options, ",")) != NULL) {
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int token, r;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_debug:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->debug = option;
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#ifdef CONFIG_NET_9P_DEBUG
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p9_debug_level = option;
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#endif
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break;
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case Opt_dfltuid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->dfltuid = make_kuid(current_user_ns(), option);
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if (!uid_valid(v9ses->dfltuid)) {
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p9_debug(P9_DEBUG_ERROR,
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"uid field, but not a uid?\n");
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ret = -EINVAL;
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continue;
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}
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break;
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case Opt_dfltgid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->dfltgid = make_kgid(current_user_ns(), option);
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if (!gid_valid(v9ses->dfltgid)) {
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p9_debug(P9_DEBUG_ERROR,
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"gid field, but not a gid?\n");
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ret = -EINVAL;
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continue;
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}
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break;
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case Opt_afid:
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r = match_int(&args[0], &option);
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if (r < 0) {
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p9_debug(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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v9ses->afid = option;
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break;
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case Opt_uname:
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kfree(v9ses->uname);
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v9ses->uname = match_strdup(&args[0]);
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if (!v9ses->uname) {
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ret = -ENOMEM;
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goto free_and_return;
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}
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break;
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case Opt_remotename:
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kfree(v9ses->aname);
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v9ses->aname = match_strdup(&args[0]);
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if (!v9ses->aname) {
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ret = -ENOMEM;
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goto free_and_return;
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}
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break;
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case Opt_nodevmap:
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v9ses->nodev = 1;
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break;
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case Opt_cache_loose:
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v9ses->cache = CACHE_LOOSE;
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break;
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case Opt_fscache:
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v9ses->cache = CACHE_FSCACHE;
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break;
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case Opt_mmap:
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v9ses->cache = CACHE_MMAP;
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break;
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case Opt_cachetag:
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#ifdef CONFIG_9P_FSCACHE
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v9ses->cachetag = match_strdup(&args[0]);
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#endif
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break;
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case Opt_cache:
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s = match_strdup(&args[0]);
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if (!s) {
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ret = -ENOMEM;
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p9_debug(P9_DEBUG_ERROR,
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"problem allocating copy of cache arg\n");
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goto free_and_return;
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}
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ret = get_cache_mode(s);
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if (ret == -EINVAL) {
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kfree(s);
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goto free_and_return;
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}
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v9ses->cache = ret;
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kfree(s);
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break;
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case Opt_access:
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s = match_strdup(&args[0]);
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if (!s) {
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ret = -ENOMEM;
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p9_debug(P9_DEBUG_ERROR,
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"problem allocating copy of access arg\n");
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goto free_and_return;
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}
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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if (strcmp(s, "user") == 0)
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v9ses->flags |= V9FS_ACCESS_USER;
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else if (strcmp(s, "any") == 0)
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v9ses->flags |= V9FS_ACCESS_ANY;
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else if (strcmp(s, "client") == 0) {
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v9ses->flags |= V9FS_ACCESS_CLIENT;
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} else {
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uid_t uid;
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v9ses->flags |= V9FS_ACCESS_SINGLE;
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uid = simple_strtoul(s, &e, 10);
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if (*e != '\0') {
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ret = -EINVAL;
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pr_info("Unknown access argument %s\n",
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s);
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kfree(s);
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goto free_and_return;
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}
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v9ses->uid = make_kuid(current_user_ns(), uid);
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if (!uid_valid(v9ses->uid)) {
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ret = -EINVAL;
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pr_info("Uknown uid %s\n", s);
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kfree(s);
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goto free_and_return;
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}
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}
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kfree(s);
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break;
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case Opt_posixacl:
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#ifdef CONFIG_9P_FS_POSIX_ACL
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v9ses->flags |= V9FS_POSIX_ACL;
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#else
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p9_debug(P9_DEBUG_ERROR,
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"Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
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#endif
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break;
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default:
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continue;
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}
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}
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free_and_return:
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kfree(tmp_options);
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fail_option_alloc:
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return ret;
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}
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/**
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* v9fs_session_init - initialize session
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* @v9ses: session information structure
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* @dev_name: device being mounted
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* @data: options
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*
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*/
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struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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const char *dev_name, char *data)
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{
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struct p9_fid *fid;
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int rc = -ENOMEM;
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v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
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if (!v9ses->uname)
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goto err_names;
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v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
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if (!v9ses->aname)
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goto err_names;
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init_rwsem(&v9ses->rename_sem);
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rc = bdi_setup_and_register(&v9ses->bdi, "9p");
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if (rc)
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goto err_names;
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v9ses->uid = INVALID_UID;
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v9ses->dfltuid = V9FS_DEFUID;
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v9ses->dfltgid = V9FS_DEFGID;
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v9ses->clnt = p9_client_create(dev_name, data);
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if (IS_ERR(v9ses->clnt)) {
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rc = PTR_ERR(v9ses->clnt);
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p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
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goto err_bdi;
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}
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v9ses->flags = V9FS_ACCESS_USER;
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if (p9_is_proto_dotl(v9ses->clnt)) {
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v9ses->flags = V9FS_ACCESS_CLIENT;
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v9ses->flags |= V9FS_PROTO_2000L;
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} else if (p9_is_proto_dotu(v9ses->clnt)) {
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v9ses->flags |= V9FS_PROTO_2000U;
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}
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rc = v9fs_parse_options(v9ses, data);
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if (rc < 0)
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goto err_clnt;
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v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
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if (!v9fs_proto_dotl(v9ses) &&
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((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
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/*
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* We support ACCESS_CLIENT only for dotl.
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* Fall back to ACCESS_USER
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*/
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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v9ses->flags |= V9FS_ACCESS_USER;
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}
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/*FIXME !! */
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/* for legacy mode, fall back to V9FS_ACCESS_ANY */
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if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
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((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
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v9ses->flags &= ~V9FS_ACCESS_MASK;
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v9ses->flags |= V9FS_ACCESS_ANY;
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v9ses->uid = INVALID_UID;
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}
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if (!v9fs_proto_dotl(v9ses) ||
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!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
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/*
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* We support ACL checks on clinet only if the protocol is
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* 9P2000.L and access is V9FS_ACCESS_CLIENT.
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*/
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v9ses->flags &= ~V9FS_ACL_MASK;
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}
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fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
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v9ses->aname);
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if (IS_ERR(fid)) {
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rc = PTR_ERR(fid);
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p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
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goto err_clnt;
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}
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if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
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fid->uid = v9ses->uid;
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else
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fid->uid = INVALID_UID;
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#ifdef CONFIG_9P_FSCACHE
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/* register the session for caching */
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v9fs_cache_session_get_cookie(v9ses);
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#endif
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spin_lock(&v9fs_sessionlist_lock);
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list_add(&v9ses->slist, &v9fs_sessionlist);
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spin_unlock(&v9fs_sessionlist_lock);
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return fid;
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err_clnt:
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p9_client_destroy(v9ses->clnt);
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err_bdi:
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bdi_destroy(&v9ses->bdi);
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err_names:
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kfree(v9ses->uname);
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kfree(v9ses->aname);
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return ERR_PTR(rc);
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}
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/**
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* v9fs_session_close - shutdown a session
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* @v9ses: session information structure
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*
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*/
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void v9fs_session_close(struct v9fs_session_info *v9ses)
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{
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if (v9ses->clnt) {
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p9_client_destroy(v9ses->clnt);
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v9ses->clnt = NULL;
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}
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#ifdef CONFIG_9P_FSCACHE
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if (v9ses->fscache) {
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v9fs_cache_session_put_cookie(v9ses);
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kfree(v9ses->cachetag);
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}
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#endif
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kfree(v9ses->uname);
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kfree(v9ses->aname);
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bdi_destroy(&v9ses->bdi);
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spin_lock(&v9fs_sessionlist_lock);
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list_del(&v9ses->slist);
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spin_unlock(&v9fs_sessionlist_lock);
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}
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/**
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* v9fs_session_cancel - terminate a session
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* @v9ses: session to terminate
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*
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* mark transport as disconnected and cancel all pending requests.
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*/
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void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
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p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
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p9_client_disconnect(v9ses->clnt);
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}
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/**
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* v9fs_session_begin_cancel - Begin terminate of a session
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* @v9ses: session to terminate
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*
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* After this call we don't allow any request other than clunk.
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*/
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void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
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{
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p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
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p9_client_begin_disconnect(v9ses->clnt);
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}
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extern int v9fs_error_init(void);
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static struct kobject *v9fs_kobj;
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|
|
#ifdef CONFIG_9P_FSCACHE
|
|
/**
|
|
* caches_show - list caches associated with a session
|
|
*
|
|
* Returns the size of buffer written.
|
|
*/
|
|
|
|
static ssize_t caches_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t n = 0, count = 0, limit = PAGE_SIZE;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
spin_lock(&v9fs_sessionlist_lock);
|
|
list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
|
|
if (v9ses->cachetag) {
|
|
n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
|
|
if (n < 0) {
|
|
count = n;
|
|
break;
|
|
}
|
|
|
|
count += n;
|
|
limit -= n;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&v9fs_sessionlist_lock);
|
|
return count;
|
|
}
|
|
|
|
static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
|
|
#endif /* CONFIG_9P_FSCACHE */
|
|
|
|
static struct attribute *v9fs_attrs[] = {
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
&v9fs_attr_cache.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group v9fs_attr_group = {
|
|
.attrs = v9fs_attrs,
|
|
};
|
|
|
|
/**
|
|
* v9fs_sysfs_init - Initialize the v9fs sysfs interface
|
|
*
|
|
*/
|
|
|
|
static int __init v9fs_sysfs_init(void)
|
|
{
|
|
v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
|
|
if (!v9fs_kobj)
|
|
return -ENOMEM;
|
|
|
|
if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
|
|
kobject_put(v9fs_kobj);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
|
|
*
|
|
*/
|
|
|
|
static void v9fs_sysfs_cleanup(void)
|
|
{
|
|
sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
|
|
kobject_put(v9fs_kobj);
|
|
}
|
|
|
|
static void v9fs_inode_init_once(void *foo)
|
|
{
|
|
struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
v9inode->fscache = NULL;
|
|
#endif
|
|
memset(&v9inode->qid, 0, sizeof(v9inode->qid));
|
|
inode_init_once(&v9inode->vfs_inode);
|
|
}
|
|
|
|
/**
|
|
* v9fs_init_inode_cache - initialize a cache for 9P
|
|
* Returns 0 on success.
|
|
*/
|
|
static int v9fs_init_inode_cache(void)
|
|
{
|
|
v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
|
|
sizeof(struct v9fs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
|
v9fs_inode_init_once);
|
|
if (!v9fs_inode_cache)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_destroy_inode_cache - destroy the cache of 9P inode
|
|
*
|
|
*/
|
|
static void v9fs_destroy_inode_cache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(v9fs_inode_cache);
|
|
}
|
|
|
|
static int v9fs_cache_register(void)
|
|
{
|
|
int ret;
|
|
ret = v9fs_init_inode_cache();
|
|
if (ret < 0)
|
|
return ret;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
ret = fscache_register_netfs(&v9fs_cache_netfs);
|
|
if (ret < 0)
|
|
v9fs_destroy_inode_cache();
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void v9fs_cache_unregister(void)
|
|
{
|
|
v9fs_destroy_inode_cache();
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
fscache_unregister_netfs(&v9fs_cache_netfs);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* init_v9fs - Initialize module
|
|
*
|
|
*/
|
|
|
|
static int __init init_v9fs(void)
|
|
{
|
|
int err;
|
|
pr_info("Installing v9fs 9p2000 file system support\n");
|
|
/* TODO: Setup list of registered trasnport modules */
|
|
|
|
err = v9fs_cache_register();
|
|
if (err < 0) {
|
|
pr_err("Failed to register v9fs for caching\n");
|
|
return err;
|
|
}
|
|
|
|
err = v9fs_sysfs_init();
|
|
if (err < 0) {
|
|
pr_err("Failed to register with sysfs\n");
|
|
goto out_cache;
|
|
}
|
|
err = register_filesystem(&v9fs_fs_type);
|
|
if (err < 0) {
|
|
pr_err("Failed to register filesystem\n");
|
|
goto out_sysfs_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_sysfs_cleanup:
|
|
v9fs_sysfs_cleanup();
|
|
|
|
out_cache:
|
|
v9fs_cache_unregister();
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* exit_v9fs - shutdown module
|
|
*
|
|
*/
|
|
|
|
static void __exit exit_v9fs(void)
|
|
{
|
|
v9fs_sysfs_cleanup();
|
|
v9fs_cache_unregister();
|
|
unregister_filesystem(&v9fs_fs_type);
|
|
}
|
|
|
|
module_init(init_v9fs)
|
|
module_exit(exit_v9fs)
|
|
|
|
MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
|
|
MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
|
|
MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
|
|
MODULE_LICENSE("GPL");
|