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0e149d4204
The Fedora 3.6 debug kernel identified the following issue where we call copy_to_user() under a spin lock(). This used to be safe in older kernels but no longer appears to be true so the spin lock was changed to a mutex. None of this code is performance critical so allowing the process to sleep is harmless. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
219 lines
8.7 KiB
C
219 lines
8.7 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPLAT_INTERNAL_H
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#define _SPLAT_INTERNAL_H
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#include "spl-device.h"
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#include "spl-debug.h"
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#include "splat-ctl.h"
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#define SPLAT_SUBSYSTEM_INIT(type) \
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({ splat_subsystem_t *_sub_; \
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\
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_sub_ = (splat_subsystem_t *)splat_##type##_init(); \
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if (_sub_ == NULL) { \
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printk(KERN_ERR "splat: Error initializing: " #type "\n"); \
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} else { \
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spin_lock(&splat_module_lock); \
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list_add_tail(&(_sub_->subsystem_list), \
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&splat_module_list); \
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spin_unlock(&splat_module_lock); \
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} \
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})
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#define SPLAT_SUBSYSTEM_FINI(type) \
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({ splat_subsystem_t *_sub_, *_tmp_; \
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int _id_, _flag_ = 0; \
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\
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_id_ = splat_##type##_id(); \
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spin_lock(&splat_module_lock); \
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list_for_each_entry_safe(_sub_, _tmp_, &splat_module_list, \
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subsystem_list) { \
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if (_sub_->desc.id == _id_) { \
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list_del_init(&(_sub_->subsystem_list)); \
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spin_unlock(&splat_module_lock); \
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splat_##type##_fini(_sub_); \
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spin_lock(&splat_module_lock); \
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_flag_ = 1; \
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} \
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} \
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spin_unlock(&splat_module_lock); \
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\
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if (!_flag_) \
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printk(KERN_ERR "splat: Error finalizing: " #type "\n"); \
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})
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#define SPLAT_TEST_INIT(sub, n, d, tid, func) \
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({ splat_test_t *_test_; \
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\
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_test_ = (splat_test_t *)kmalloc(sizeof(*_test_), GFP_KERNEL); \
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if (_test_ == NULL) { \
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printk(KERN_ERR "splat: Error initializing: " n "/" #tid" \n");\
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} else { \
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memset(_test_, 0, sizeof(*_test_)); \
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strncpy(_test_->desc.name, n, SPLAT_NAME_SIZE-1); \
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strncpy(_test_->desc.desc, d, SPLAT_DESC_SIZE-1); \
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_test_->desc.id = tid; \
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_test_->test = func; \
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INIT_LIST_HEAD(&(_test_->test_list)); \
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spin_lock(&((sub)->test_lock)); \
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list_add_tail(&(_test_->test_list),&((sub)->test_list));\
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spin_unlock(&((sub)->test_lock)); \
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} \
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})
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#define SPLAT_TEST_FINI(sub, tid) \
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({ splat_test_t *_test_, *_tmp_; \
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int _flag_ = 0; \
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\
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spin_lock(&((sub)->test_lock)); \
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list_for_each_entry_safe(_test_, _tmp_, \
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&((sub)->test_list), test_list) { \
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if (_test_->desc.id == tid) { \
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list_del_init(&(_test_->test_list)); \
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_flag_ = 1; \
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} \
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} \
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spin_unlock(&((sub)->test_lock)); \
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\
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if (!_flag_) \
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printk(KERN_ERR "splat: Error finalizing: " #tid "\n"); \
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})
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typedef int (*splat_test_func_t)(struct file *, void *);
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typedef struct splat_test {
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struct list_head test_list;
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splat_user_t desc;
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splat_test_func_t test;
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} splat_test_t;
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typedef struct splat_subsystem {
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struct list_head subsystem_list;/* List had to chain entries */
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splat_user_t desc;
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spinlock_t test_lock;
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struct list_head test_list;
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} splat_subsystem_t;
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#define SPLAT_INFO_BUFFER_SIZE 65536
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#define SPLAT_INFO_BUFFER_REDZONE 256
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typedef struct splat_info {
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struct mutex info_lock;
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int info_size;
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char *info_buffer;
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char *info_head; /* Internal kernel use only */
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} splat_info_t;
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#define sym2str(sym) (char *)(#sym)
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#define splat_print(file, format, args...) \
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({ splat_info_t *_info_ = (splat_info_t *)file->private_data; \
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int _rc_; \
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\
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ASSERT(_info_); \
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ASSERT(_info_->info_buffer); \
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\
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mutex_lock(&_info_->info_lock); \
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\
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/* Don't allow the kernel to start a write in the red zone */ \
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if ((int)(_info_->info_head - _info_->info_buffer) > \
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(SPLAT_INFO_BUFFER_SIZE - SPLAT_INFO_BUFFER_REDZONE)) { \
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_rc_ = -EOVERFLOW; \
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} else { \
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_rc_ = sprintf(_info_->info_head, format, args); \
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if (_rc_ >= 0) \
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_info_->info_head += _rc_; \
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} \
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\
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mutex_unlock(&_info_->info_lock); \
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_rc_; \
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})
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#define splat_vprint(file, test, format, args...) \
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splat_print(file, "%*s: " format, SPLAT_NAME_SIZE, test, args)
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#define splat_locked_test(lock, test) \
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({ \
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int _rc_; \
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spin_lock(lock); \
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_rc_ = (test) ? 1 : 0; \
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spin_unlock(lock); \
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_rc_; \
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})
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splat_subsystem_t *splat_condvar_init(void);
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splat_subsystem_t *splat_kmem_init(void);
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splat_subsystem_t *splat_mutex_init(void);
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splat_subsystem_t *splat_krng_init(void);
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splat_subsystem_t *splat_rwlock_init(void);
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splat_subsystem_t *splat_taskq_init(void);
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splat_subsystem_t *splat_thread_init(void);
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splat_subsystem_t *splat_time_init(void);
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splat_subsystem_t *splat_vnode_init(void);
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splat_subsystem_t *splat_kobj_init(void);
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splat_subsystem_t *splat_atomic_init(void);
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splat_subsystem_t *splat_list_init(void);
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splat_subsystem_t *splat_generic_init(void);
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splat_subsystem_t *splat_cred_init(void);
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splat_subsystem_t *splat_zlib_init(void);
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splat_subsystem_t *splat_linux_init(void);
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void splat_condvar_fini(splat_subsystem_t *);
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void splat_kmem_fini(splat_subsystem_t *);
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void splat_mutex_fini(splat_subsystem_t *);
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void splat_krng_fini(splat_subsystem_t *);
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void splat_rwlock_fini(splat_subsystem_t *);
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void splat_taskq_fini(splat_subsystem_t *);
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void splat_thread_fini(splat_subsystem_t *);
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void splat_time_fini(splat_subsystem_t *);
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void splat_vnode_fini(splat_subsystem_t *);
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void splat_kobj_fini(splat_subsystem_t *);
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void splat_atomic_fini(splat_subsystem_t *);
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void splat_list_fini(splat_subsystem_t *);
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void splat_generic_fini(splat_subsystem_t *);
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void splat_cred_fini(splat_subsystem_t *);
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void splat_zlib_fini(splat_subsystem_t *);
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void splat_linux_fini(splat_subsystem_t *);
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int splat_condvar_id(void);
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int splat_kmem_id(void);
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int splat_mutex_id(void);
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int splat_krng_id(void);
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int splat_rwlock_id(void);
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int splat_taskq_id(void);
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int splat_thread_id(void);
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int splat_time_id(void);
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int splat_vnode_id(void);
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int splat_kobj_id(void);
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int splat_atomic_id(void);
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int splat_list_id(void);
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int splat_generic_id(void);
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int splat_cred_id(void);
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int splat_zlib_id(void);
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int splat_linux_id(void);
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#endif /* _SPLAT_INTERNAL_H */
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