tracefile.c

来自「lustre 1.6.5 source code」· C语言 代码 · 共 1,115 行 · 第 1/3 页

                                cdls->cdls_delay = libcfs_console_min_delay;
                        else if (cdls->cdls_delay > libcfs_console_max_delay)
                                cdls->cdls_delay = libcfs_console_max_delay;
                }

                /* ensure cdls_next is never zero after it's been seen */
                cdls->cdls_next = (cfs_time_current() + cdls->cdls_delay) | 1;
        }

        if (tcd != NULL) {
                print_to_console(&header, mask, string_buf, needed, file, fn);
                trace_put_tcd(tcd);
        } else {
                string_buf = trace_get_console_buffer();

                needed = 0;
                if (format1 != NULL) {
                        va_copy(ap, args);
                        needed = vsnprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, format1, ap);
                        va_end(ap);
                }
                if (format2 != NULL) {
                        remain = TRACE_CONSOLE_BUFFER_SIZE - needed;
                        if (remain > 0) {
                                va_start(ap, format2);
                                needed += vsnprintf(string_buf+needed, remain, format2, ap);
                                va_end(ap);
                        }
                }
                print_to_console(&header, mask,
                                 string_buf, needed, file, fn);

                trace_put_console_buffer(string_buf);
        }

        if (cdls != NULL && cdls->cdls_count != 0) {
                string_buf = trace_get_console_buffer();

                needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE,
                         "Skipped %d previous similar message%s\n",
                         cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : "");

                print_to_console(&header, mask,
                                 string_buf, needed, file, fn);

                trace_put_console_buffer(string_buf);
                cdls->cdls_count = 0;
        }

        return 0;
}
EXPORT_SYMBOL(libcfs_debug_vmsg2);

void
libcfs_assertion_failed(const char *expr, const char *file,
                        const char *func, const int line)
{
        libcfs_debug_msg(NULL, 0, D_EMERG, file, func, line,
                         "ASSERTION(%s) failed\n", expr);
        LBUG();
}
EXPORT_SYMBOL(libcfs_assertion_failed);

void
trace_assertion_failed(const char *str,
                       const char *fn, const char *file, int line)
{
        struct ptldebug_header hdr;

        libcfs_panic_in_progress = 1;
        libcfs_catastrophe = 1;
        mb();

        set_ptldebug_header(&hdr, DEBUG_SUBSYSTEM, D_EMERG, line,
                            CDEBUG_STACK());

        print_to_console(&hdr, D_EMERG, str, strlen(str), file, fn);

        LIBCFS_PANIC("Lustre debug assertion failure\n");

        /* not reached */
}

static void
panic_collect_pages(struct page_collection *pc)
{
        /* Do the collect_pages job on a single CPU: assumes that all other
         * CPUs have been stopped during a panic.  If this isn't true for some
         * arch, this will have to be implemented separately in each arch.  */
        int                    i;
        int                    j;
        struct trace_cpu_data *tcd;

        CFS_INIT_LIST_HEAD(&pc->pc_pages);

        tcd_for_each(tcd, i, j) {
                list_splice_init(&tcd->tcd_pages, &pc->pc_pages);
                tcd->tcd_cur_pages = 0;

                if (pc->pc_want_daemon_pages) {
                        list_splice_init(&tcd->tcd_daemon_pages, &pc->pc_pages);
                        tcd->tcd_cur_daemon_pages = 0;
                }
        }
}

static void collect_pages_on_cpu(void *info)
{
        struct trace_cpu_data *tcd;
        struct page_collection *pc = info;
        int i;

        spin_lock(&pc->pc_lock);
        tcd_for_each_type_lock(tcd, i) {
                list_splice_init(&tcd->tcd_pages, &pc->pc_pages);
                tcd->tcd_cur_pages = 0;
                if (pc->pc_want_daemon_pages) {
                        list_splice_init(&tcd->tcd_daemon_pages, &pc->pc_pages);
                        tcd->tcd_cur_daemon_pages = 0;
                }
        }
        spin_unlock(&pc->pc_lock);
}

static void collect_pages(struct page_collection *pc)
{
        CFS_INIT_LIST_HEAD(&pc->pc_pages);

        if (libcfs_panic_in_progress)
                panic_collect_pages(pc);
        else
                trace_call_on_all_cpus(collect_pages_on_cpu, pc);
}

static void put_pages_back_on_cpu(void *info)
{
        struct page_collection *pc = info;
        struct trace_cpu_data *tcd;
        struct list_head *cur_head;
        struct trace_page *tage;
        struct trace_page *tmp;
        int i;

        spin_lock(&pc->pc_lock);
        tcd_for_each_type_lock(tcd, i) {
                cur_head = tcd->tcd_pages.next;

                list_for_each_entry_safe(tage, tmp, &pc->pc_pages, linkage) {

                        __LASSERT_TAGE_INVARIANT(tage);

                        if (tage->cpu != smp_processor_id() || tage->type != i)
                                continue;

                        tage_to_tail(tage, cur_head);
                        tcd->tcd_cur_pages++;
                }
        }
        spin_unlock(&pc->pc_lock);
}

static void put_pages_back(struct page_collection *pc)
{
        if (!libcfs_panic_in_progress)
                trace_call_on_all_cpus(put_pages_back_on_cpu, pc);
}

/* Add pages to a per-cpu debug daemon ringbuffer.  This buffer makes sure that
 * we have a good amount of data at all times for dumping during an LBUG, even
 * if we have been steadily writing (and otherwise discarding) pages via the
 * debug daemon. */
static void put_pages_on_tcd_daemon_list(struct page_collection *pc,
                                         struct trace_cpu_data *tcd)
{
        struct trace_page *tage;
        struct trace_page *tmp;

        spin_lock(&pc->pc_lock);
        list_for_each_entry_safe(tage, tmp, &pc->pc_pages, linkage) {

                __LASSERT_TAGE_INVARIANT(tage);

                if (tage->cpu != smp_processor_id() ||
                    tage->type != tcd->tcd_type)
                        continue;

                tage_to_tail(tage, &tcd->tcd_daemon_pages);
                tcd->tcd_cur_daemon_pages++;

                if (tcd->tcd_cur_daemon_pages > tcd->tcd_max_pages) {
                        struct trace_page *victim;

                        __LASSERT(!list_empty(&tcd->tcd_daemon_pages));
                        victim = tage_from_list(tcd->tcd_daemon_pages.next);

                        __LASSERT_TAGE_INVARIANT(victim);

                        list_del(&victim->linkage);
                        tage_free(victim);
                        tcd->tcd_cur_daemon_pages--;
                }
        }
        spin_unlock(&pc->pc_lock);
}

static void put_pages_on_daemon_list_on_cpu(void *info)
{
        struct trace_cpu_data *tcd;
        int i;

        tcd_for_each_type_lock(tcd, i)
                put_pages_on_tcd_daemon_list(info, tcd);
}

static void put_pages_on_daemon_list(struct page_collection *pc)
{
        trace_call_on_all_cpus(put_pages_on_daemon_list_on_cpu, pc);
}

void trace_debug_print(void)
{
        struct page_collection pc;
        struct trace_page *tage;
        struct trace_page *tmp;

        spin_lock_init(&pc.pc_lock);

        pc.pc_want_daemon_pages = 1;
        collect_pages(&pc);
        list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {
                char *p, *file, *fn;
                cfs_page_t *page;

                __LASSERT_TAGE_INVARIANT(tage);

                page = tage->page;
                p = cfs_page_address(page);
                while (p < ((char *)cfs_page_address(page) + tage->used)) {
                        struct ptldebug_header *hdr;
                        int len;
                        hdr = (void *)p;
                        p += sizeof(*hdr);
                        file = p;
                        p += strlen(file) + 1;
                        fn = p;
                        p += strlen(fn) + 1;
                        len = hdr->ph_len - (p - (char *)hdr);

                        print_to_console(hdr, D_EMERG, p, len, file, fn);

                        p += len;
                }

                list_del(&tage->linkage);
                tage_free(tage);
        }
}

int tracefile_dump_all_pages(char *filename)
{
        struct page_collection pc;
        cfs_file_t *filp;
        struct trace_page *tage;
        struct trace_page *tmp;
        int rc;

        CFS_DECL_MMSPACE;

        tracefile_write_lock();

        filp = cfs_filp_open(filename,
                             O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, 0600, &rc);
        if (!filp) {
                if (rc != -EEXIST)
                        printk(KERN_ERR "LustreError: can't open %s for dump: rc %d\n",
                               filename, rc);
                goto out;
        }

        spin_lock_init(&pc.pc_lock);
        pc.pc_want_daemon_pages = 1;
        collect_pages(&pc);
        if (list_empty(&pc.pc_pages)) {
                rc = 0;
                goto close;
        }

        /* ok, for now, just write the pages.  in the future we'll be building
         * iobufs with the pages and calling generic_direct_IO */
        CFS_MMSPACE_OPEN;
        list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {

                __LASSERT_TAGE_INVARIANT(tage);

                rc = cfs_filp_write(filp, cfs_page_address(tage->page),
                                    tage->used, cfs_filp_poff(filp));
                if (rc != (int)tage->used) {
                        printk(KERN_WARNING "wanted to write %u but wrote "
                               "%d\n", tage->used, rc);
                        put_pages_back(&pc);
                        __LASSERT(list_empty(&pc.pc_pages));
                        break;
                }
                list_del(&tage->linkage);
                tage_free(tage);
        }
        CFS_MMSPACE_CLOSE;
        rc = cfs_filp_fsync(filp);
        if (rc)
                printk(KERN_ERR "sync returns %d\n", rc);
 close:
        cfs_filp_close(filp);
 out:
        tracefile_write_unlock();
        return rc;
}

void trace_flush_pages(void)
{
        struct page_collection pc;
        struct trace_page *tage;
        struct trace_page *tmp;

        spin_lock_init(&pc.pc_lock);

        pc.pc_want_daemon_pages = 1;
        collect_pages(&pc);
        list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {

                __LASSERT_TAGE_INVARIANT(tage);

                list_del(&tage->linkage);
                tage_free(tage);
        }
}

int trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
                        const char *usr_buffer, int usr_buffer_nob)
{
        int    nob;
        
        if (usr_buffer_nob > knl_buffer_nob)
                return -EOVERFLOW;
        
        if (copy_from_user((void *)knl_buffer, 
                           (void *)usr_buffer, usr_buffer_nob))
                return -EFAULT;

        nob = strnlen(knl_buffer, usr_buffer_nob);
        while (nob-- >= 0)                      /* strip trailing whitespace */
                if (!isspace(knl_buffer[nob]))
                        break;

        if (nob < 0)                            /* empty string */
                return -EINVAL;

        if (nob == knl_buffer_nob)              /* no space to terminate */
                return -EOVERFLOW;

        knl_buffer[nob + 1] = 0;                /* terminate */
        return 0;
}

int trace_copyout_string(char *usr_buffer, int usr_buffer_nob,
                         const char *knl_buffer, char *append)
{
        /* NB if 'append' != NULL, it's a single character to append to the
         * copied out string - usually "\n", for /proc entries and "" (i.e. a
         * terminating zero byte) for sysctl entries */
        int   nob = strlen(knl_buffer);
        
        if (nob > usr_buffer_nob)