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748 lines
16 KiB
748 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* Daemon interface |
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* |
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/sched.h> |
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#include <linux/completion.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/namei.h> |
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#include <linux/poll.h> |
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#include <linux/mount.h> |
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#include <linux/statfs.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#include <linux/fs_struct.h> |
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#include "internal.h" |
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|
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static int cachefiles_daemon_open(struct inode *, struct file *); |
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static int cachefiles_daemon_release(struct inode *, struct file *); |
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static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t, |
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loff_t *); |
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static ssize_t cachefiles_daemon_write(struct file *, const char __user *, |
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size_t, loff_t *); |
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static __poll_t cachefiles_daemon_poll(struct file *, |
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struct poll_table_struct *); |
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static int cachefiles_daemon_frun(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_brun(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_cull(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_debug(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_dir(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *); |
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static int cachefiles_daemon_tag(struct cachefiles_cache *, char *); |
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|
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static unsigned long cachefiles_open; |
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|
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const struct file_operations cachefiles_daemon_fops = { |
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.owner = THIS_MODULE, |
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.open = cachefiles_daemon_open, |
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.release = cachefiles_daemon_release, |
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.read = cachefiles_daemon_read, |
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.write = cachefiles_daemon_write, |
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.poll = cachefiles_daemon_poll, |
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.llseek = noop_llseek, |
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}; |
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|
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struct cachefiles_daemon_cmd { |
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char name[8]; |
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int (*handler)(struct cachefiles_cache *cache, char *args); |
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}; |
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|
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static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = { |
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{ "bind", cachefiles_daemon_bind }, |
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{ "brun", cachefiles_daemon_brun }, |
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{ "bcull", cachefiles_daemon_bcull }, |
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{ "bstop", cachefiles_daemon_bstop }, |
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{ "cull", cachefiles_daemon_cull }, |
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{ "debug", cachefiles_daemon_debug }, |
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{ "dir", cachefiles_daemon_dir }, |
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{ "frun", cachefiles_daemon_frun }, |
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{ "fcull", cachefiles_daemon_fcull }, |
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{ "fstop", cachefiles_daemon_fstop }, |
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{ "inuse", cachefiles_daemon_inuse }, |
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{ "secctx", cachefiles_daemon_secctx }, |
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{ "tag", cachefiles_daemon_tag }, |
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{ "", NULL } |
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}; |
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/* |
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* do various checks |
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*/ |
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static int cachefiles_daemon_open(struct inode *inode, struct file *file) |
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{ |
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struct cachefiles_cache *cache; |
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|
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_enter(""); |
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|
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/* only the superuser may do this */ |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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|
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/* the cachefiles device may only be open once at a time */ |
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if (xchg(&cachefiles_open, 1) == 1) |
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return -EBUSY; |
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|
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/* allocate a cache record */ |
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cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL); |
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if (!cache) { |
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cachefiles_open = 0; |
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return -ENOMEM; |
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} |
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|
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mutex_init(&cache->daemon_mutex); |
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cache->active_nodes = RB_ROOT; |
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rwlock_init(&cache->active_lock); |
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init_waitqueue_head(&cache->daemon_pollwq); |
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|
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/* set default caching limits |
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* - limit at 1% free space and/or free files |
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* - cull below 5% free space and/or free files |
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* - cease culling above 7% free space and/or free files |
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*/ |
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cache->frun_percent = 7; |
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cache->fcull_percent = 5; |
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cache->fstop_percent = 1; |
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cache->brun_percent = 7; |
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cache->bcull_percent = 5; |
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cache->bstop_percent = 1; |
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|
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file->private_data = cache; |
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cache->cachefilesd = file; |
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return 0; |
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} |
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|
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/* |
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* release a cache |
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*/ |
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static int cachefiles_daemon_release(struct inode *inode, struct file *file) |
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{ |
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struct cachefiles_cache *cache = file->private_data; |
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_enter(""); |
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ASSERT(cache); |
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set_bit(CACHEFILES_DEAD, &cache->flags); |
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cachefiles_daemon_unbind(cache); |
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|
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ASSERT(!cache->active_nodes.rb_node); |
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|
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/* clean up the control file interface */ |
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cache->cachefilesd = NULL; |
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file->private_data = NULL; |
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cachefiles_open = 0; |
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kfree(cache); |
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_leave(""); |
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return 0; |
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} |
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/* |
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* read the cache state |
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*/ |
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static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer, |
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size_t buflen, loff_t *pos) |
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{ |
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struct cachefiles_cache *cache = file->private_data; |
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unsigned long long b_released; |
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unsigned f_released; |
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char buffer[256]; |
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int n; |
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|
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//_enter(",,%zu,", buflen); |
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|
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if (!test_bit(CACHEFILES_READY, &cache->flags)) |
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return 0; |
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|
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/* check how much space the cache has */ |
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cachefiles_has_space(cache, 0, 0); |
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|
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/* summarise */ |
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f_released = atomic_xchg(&cache->f_released, 0); |
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b_released = atomic_long_xchg(&cache->b_released, 0); |
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clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags); |
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n = snprintf(buffer, sizeof(buffer), |
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"cull=%c" |
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" frun=%llx" |
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" fcull=%llx" |
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" fstop=%llx" |
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" brun=%llx" |
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" bcull=%llx" |
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" bstop=%llx" |
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" freleased=%x" |
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" breleased=%llx", |
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test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0', |
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(unsigned long long) cache->frun, |
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(unsigned long long) cache->fcull, |
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(unsigned long long) cache->fstop, |
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(unsigned long long) cache->brun, |
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(unsigned long long) cache->bcull, |
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(unsigned long long) cache->bstop, |
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f_released, |
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b_released); |
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|
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if (n > buflen) |
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return -EMSGSIZE; |
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|
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if (copy_to_user(_buffer, buffer, n) != 0) |
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return -EFAULT; |
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|
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return n; |
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} |
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|
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/* |
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* command the cache |
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*/ |
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static ssize_t cachefiles_daemon_write(struct file *file, |
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const char __user *_data, |
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size_t datalen, |
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loff_t *pos) |
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{ |
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const struct cachefiles_daemon_cmd *cmd; |
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struct cachefiles_cache *cache = file->private_data; |
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ssize_t ret; |
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char *data, *args, *cp; |
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//_enter(",,%zu,", datalen); |
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ASSERT(cache); |
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if (test_bit(CACHEFILES_DEAD, &cache->flags)) |
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return -EIO; |
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if (datalen < 0 || datalen > PAGE_SIZE - 1) |
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return -EOPNOTSUPP; |
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/* drag the command string into the kernel so we can parse it */ |
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data = memdup_user_nul(_data, datalen); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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ret = -EINVAL; |
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if (memchr(data, '\0', datalen)) |
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goto error; |
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|
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/* strip any newline */ |
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cp = memchr(data, '\n', datalen); |
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if (cp) { |
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if (cp == data) |
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goto error; |
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|
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*cp = '\0'; |
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} |
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|
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/* parse the command */ |
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ret = -EOPNOTSUPP; |
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|
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for (args = data; *args; args++) |
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if (isspace(*args)) |
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break; |
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if (*args) { |
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if (args == data) |
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goto error; |
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*args = '\0'; |
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args = skip_spaces(++args); |
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} |
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|
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/* run the appropriate command handler */ |
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for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++) |
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if (strcmp(cmd->name, data) == 0) |
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goto found_command; |
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error: |
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kfree(data); |
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//_leave(" = %zd", ret); |
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return ret; |
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found_command: |
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mutex_lock(&cache->daemon_mutex); |
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|
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ret = -EIO; |
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if (!test_bit(CACHEFILES_DEAD, &cache->flags)) |
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ret = cmd->handler(cache, args); |
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mutex_unlock(&cache->daemon_mutex); |
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if (ret == 0) |
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ret = datalen; |
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goto error; |
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} |
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|
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/* |
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* poll for culling state |
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* - use EPOLLOUT to indicate culling state |
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*/ |
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static __poll_t cachefiles_daemon_poll(struct file *file, |
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struct poll_table_struct *poll) |
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{ |
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struct cachefiles_cache *cache = file->private_data; |
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__poll_t mask; |
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poll_wait(file, &cache->daemon_pollwq, poll); |
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mask = 0; |
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if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags)) |
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mask |= EPOLLIN; |
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if (test_bit(CACHEFILES_CULLING, &cache->flags)) |
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mask |= EPOLLOUT; |
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return mask; |
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} |
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/* |
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* give a range error for cache space constraints |
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* - can be tail-called |
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*/ |
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static int cachefiles_daemon_range_error(struct cachefiles_cache *cache, |
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char *args) |
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{ |
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pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n"); |
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|
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return -EINVAL; |
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} |
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/* |
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* set the percentage of files at which to stop culling |
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* - command: "frun <N>%" |
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*/ |
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static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args) |
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{ |
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unsigned long frun; |
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|
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_enter(",%s", args); |
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|
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if (!*args) |
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return -EINVAL; |
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frun = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
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if (frun <= cache->fcull_percent || frun >= 100) |
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return cachefiles_daemon_range_error(cache, args); |
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cache->frun_percent = frun; |
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return 0; |
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} |
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|
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/* |
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* set the percentage of files at which to start culling |
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* - command: "fcull <N>%" |
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*/ |
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static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args) |
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{ |
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unsigned long fcull; |
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|
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_enter(",%s", args); |
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|
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if (!*args) |
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return -EINVAL; |
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fcull = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
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if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent) |
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return cachefiles_daemon_range_error(cache, args); |
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cache->fcull_percent = fcull; |
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return 0; |
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} |
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|
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/* |
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* set the percentage of files at which to stop allocating |
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* - command: "fstop <N>%" |
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*/ |
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static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args) |
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{ |
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unsigned long fstop; |
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|
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_enter(",%s", args); |
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|
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if (!*args) |
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return -EINVAL; |
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|
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fstop = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
|
|
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if (fstop < 0 || fstop >= cache->fcull_percent) |
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return cachefiles_daemon_range_error(cache, args); |
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|
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cache->fstop_percent = fstop; |
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return 0; |
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} |
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|
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/* |
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* set the percentage of blocks at which to stop culling |
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* - command: "brun <N>%" |
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*/ |
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static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args) |
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{ |
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unsigned long brun; |
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|
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_enter(",%s", args); |
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|
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if (!*args) |
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return -EINVAL; |
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brun = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
|
|
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if (brun <= cache->bcull_percent || brun >= 100) |
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return cachefiles_daemon_range_error(cache, args); |
|
|
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cache->brun_percent = brun; |
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return 0; |
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} |
|
|
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/* |
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* set the percentage of blocks at which to start culling |
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* - command: "bcull <N>%" |
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*/ |
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static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args) |
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{ |
|
unsigned long bcull; |
|
|
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_enter(",%s", args); |
|
|
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if (!*args) |
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return -EINVAL; |
|
|
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bcull = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
|
|
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if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent) |
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return cachefiles_daemon_range_error(cache, args); |
|
|
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cache->bcull_percent = bcull; |
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return 0; |
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} |
|
|
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/* |
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* set the percentage of blocks at which to stop allocating |
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* - command: "bstop <N>%" |
|
*/ |
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static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args) |
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{ |
|
unsigned long bstop; |
|
|
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_enter(",%s", args); |
|
|
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if (!*args) |
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return -EINVAL; |
|
|
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bstop = simple_strtoul(args, &args, 10); |
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if (args[0] != '%' || args[1] != '\0') |
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return -EINVAL; |
|
|
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if (bstop < 0 || bstop >= cache->bcull_percent) |
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return cachefiles_daemon_range_error(cache, args); |
|
|
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cache->bstop_percent = bstop; |
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return 0; |
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} |
|
|
|
/* |
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* set the cache directory |
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* - command: "dir <name>" |
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*/ |
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static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args) |
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{ |
|
char *dir; |
|
|
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_enter(",%s", args); |
|
|
|
if (!*args) { |
|
pr_err("Empty directory specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (cache->rootdirname) { |
|
pr_err("Second cache directory specified\n"); |
|
return -EEXIST; |
|
} |
|
|
|
dir = kstrdup(args, GFP_KERNEL); |
|
if (!dir) |
|
return -ENOMEM; |
|
|
|
cache->rootdirname = dir; |
|
return 0; |
|
} |
|
|
|
/* |
|
* set the cache security context |
|
* - command: "secctx <ctx>" |
|
*/ |
|
static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args) |
|
{ |
|
char *secctx; |
|
|
|
_enter(",%s", args); |
|
|
|
if (!*args) { |
|
pr_err("Empty security context specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (cache->secctx) { |
|
pr_err("Second security context specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
secctx = kstrdup(args, GFP_KERNEL); |
|
if (!secctx) |
|
return -ENOMEM; |
|
|
|
cache->secctx = secctx; |
|
return 0; |
|
} |
|
|
|
/* |
|
* set the cache tag |
|
* - command: "tag <name>" |
|
*/ |
|
static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args) |
|
{ |
|
char *tag; |
|
|
|
_enter(",%s", args); |
|
|
|
if (!*args) { |
|
pr_err("Empty tag specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (cache->tag) |
|
return -EEXIST; |
|
|
|
tag = kstrdup(args, GFP_KERNEL); |
|
if (!tag) |
|
return -ENOMEM; |
|
|
|
cache->tag = tag; |
|
return 0; |
|
} |
|
|
|
/* |
|
* request a node in the cache be culled from the current working directory |
|
* - command: "cull <name>" |
|
*/ |
|
static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args) |
|
{ |
|
struct path path; |
|
const struct cred *saved_cred; |
|
int ret; |
|
|
|
_enter(",%s", args); |
|
|
|
if (strchr(args, '/')) |
|
goto inval; |
|
|
|
if (!test_bit(CACHEFILES_READY, &cache->flags)) { |
|
pr_err("cull applied to unready cache\n"); |
|
return -EIO; |
|
} |
|
|
|
if (test_bit(CACHEFILES_DEAD, &cache->flags)) { |
|
pr_err("cull applied to dead cache\n"); |
|
return -EIO; |
|
} |
|
|
|
/* extract the directory dentry from the cwd */ |
|
get_fs_pwd(current->fs, &path); |
|
|
|
if (!d_can_lookup(path.dentry)) |
|
goto notdir; |
|
|
|
cachefiles_begin_secure(cache, &saved_cred); |
|
ret = cachefiles_cull(cache, path.dentry, args); |
|
cachefiles_end_secure(cache, saved_cred); |
|
|
|
path_put(&path); |
|
_leave(" = %d", ret); |
|
return ret; |
|
|
|
notdir: |
|
path_put(&path); |
|
pr_err("cull command requires dirfd to be a directory\n"); |
|
return -ENOTDIR; |
|
|
|
inval: |
|
pr_err("cull command requires dirfd and filename\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* set debugging mode |
|
* - command: "debug <mask>" |
|
*/ |
|
static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args) |
|
{ |
|
unsigned long mask; |
|
|
|
_enter(",%s", args); |
|
|
|
mask = simple_strtoul(args, &args, 0); |
|
if (args[0] != '\0') |
|
goto inval; |
|
|
|
cachefiles_debug = mask; |
|
_leave(" = 0"); |
|
return 0; |
|
|
|
inval: |
|
pr_err("debug command requires mask\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* find out whether an object in the current working directory is in use or not |
|
* - command: "inuse <name>" |
|
*/ |
|
static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args) |
|
{ |
|
struct path path; |
|
const struct cred *saved_cred; |
|
int ret; |
|
|
|
//_enter(",%s", args); |
|
|
|
if (strchr(args, '/')) |
|
goto inval; |
|
|
|
if (!test_bit(CACHEFILES_READY, &cache->flags)) { |
|
pr_err("inuse applied to unready cache\n"); |
|
return -EIO; |
|
} |
|
|
|
if (test_bit(CACHEFILES_DEAD, &cache->flags)) { |
|
pr_err("inuse applied to dead cache\n"); |
|
return -EIO; |
|
} |
|
|
|
/* extract the directory dentry from the cwd */ |
|
get_fs_pwd(current->fs, &path); |
|
|
|
if (!d_can_lookup(path.dentry)) |
|
goto notdir; |
|
|
|
cachefiles_begin_secure(cache, &saved_cred); |
|
ret = cachefiles_check_in_use(cache, path.dentry, args); |
|
cachefiles_end_secure(cache, saved_cred); |
|
|
|
path_put(&path); |
|
//_leave(" = %d", ret); |
|
return ret; |
|
|
|
notdir: |
|
path_put(&path); |
|
pr_err("inuse command requires dirfd to be a directory\n"); |
|
return -ENOTDIR; |
|
|
|
inval: |
|
pr_err("inuse command requires dirfd and filename\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* see if we have space for a number of pages and/or a number of files in the |
|
* cache |
|
*/ |
|
int cachefiles_has_space(struct cachefiles_cache *cache, |
|
unsigned fnr, unsigned bnr) |
|
{ |
|
struct kstatfs stats; |
|
struct path path = { |
|
.mnt = cache->mnt, |
|
.dentry = cache->mnt->mnt_root, |
|
}; |
|
int ret; |
|
|
|
//_enter("{%llu,%llu,%llu,%llu,%llu,%llu},%u,%u", |
|
// (unsigned long long) cache->frun, |
|
// (unsigned long long) cache->fcull, |
|
// (unsigned long long) cache->fstop, |
|
// (unsigned long long) cache->brun, |
|
// (unsigned long long) cache->bcull, |
|
// (unsigned long long) cache->bstop, |
|
// fnr, bnr); |
|
|
|
/* find out how many pages of blockdev are available */ |
|
memset(&stats, 0, sizeof(stats)); |
|
|
|
ret = vfs_statfs(&path, &stats); |
|
if (ret < 0) { |
|
if (ret == -EIO) |
|
cachefiles_io_error(cache, "statfs failed"); |
|
_leave(" = %d", ret); |
|
return ret; |
|
} |
|
|
|
stats.f_bavail >>= cache->bshift; |
|
|
|
//_debug("avail %llu,%llu", |
|
// (unsigned long long) stats.f_ffree, |
|
// (unsigned long long) stats.f_bavail); |
|
|
|
/* see if there is sufficient space */ |
|
if (stats.f_ffree > fnr) |
|
stats.f_ffree -= fnr; |
|
else |
|
stats.f_ffree = 0; |
|
|
|
if (stats.f_bavail > bnr) |
|
stats.f_bavail -= bnr; |
|
else |
|
stats.f_bavail = 0; |
|
|
|
ret = -ENOBUFS; |
|
if (stats.f_ffree < cache->fstop || |
|
stats.f_bavail < cache->bstop) |
|
goto begin_cull; |
|
|
|
ret = 0; |
|
if (stats.f_ffree < cache->fcull || |
|
stats.f_bavail < cache->bcull) |
|
goto begin_cull; |
|
|
|
if (test_bit(CACHEFILES_CULLING, &cache->flags) && |
|
stats.f_ffree >= cache->frun && |
|
stats.f_bavail >= cache->brun && |
|
test_and_clear_bit(CACHEFILES_CULLING, &cache->flags) |
|
) { |
|
_debug("cease culling"); |
|
cachefiles_state_changed(cache); |
|
} |
|
|
|
//_leave(" = 0"); |
|
return 0; |
|
|
|
begin_cull: |
|
if (!test_and_set_bit(CACHEFILES_CULLING, &cache->flags)) { |
|
_debug("### CULL CACHE ###"); |
|
cachefiles_state_changed(cache); |
|
} |
|
|
|
_leave(" = %d", ret); |
|
return ret; |
|
}
|
|
|