+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Copyright (C) 2004 Cluster File Systems, Inc.
- * Author: Zach Brown <zab@clusterfs.com>
- * Author: Phil Schwan <phil@clusterfs.com>
- *
- * This file is part of Lustre, http://www.lustre.org.
- *
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
-#define DEBUG_SUBSYSTEM S_LNET
-#define LUSTRE_TRACEFILE_PRIVATE
-#include "tracefile.h"
-
-#include <libcfs/kp30.h>
-#include <libcfs/libcfs.h>
-
-/* XXX move things up to the top, comment */
-union trace_data_union (*trace_data[TCD_MAX_TYPES])[NR_CPUS] __cacheline_aligned;
-
-char tracefile[TRACEFILE_NAME_SIZE];
-long long tracefile_size = TRACEFILE_SIZE;
-static struct tracefiled_ctl trace_tctl;
-struct semaphore trace_thread_sem;
-static int thread_running = 0;
-
-atomic_t tage_allocated = ATOMIC_INIT(0);
-
-static void put_pages_on_tcd_daemon_list(struct page_collection *pc,
- struct trace_cpu_data *tcd);
-
-static inline struct trace_page *tage_from_list(struct list_head *list)
-{
- return list_entry(list, struct trace_page, linkage);
-}
-
-static struct trace_page *tage_alloc(int gfp)
-{
- cfs_page_t *page;
- struct trace_page *tage;
-
- /*
- * Don't spam console with allocation failures: they will be reported
- * by upper layer anyway.
- */
- gfp |= CFS_ALLOC_NOWARN;
- page = cfs_alloc_page(gfp);
- if (page == NULL)
- return NULL;
-
- tage = cfs_alloc(sizeof(*tage), gfp);
- if (tage == NULL) {
- cfs_free_page(page);
- return NULL;
- }
-
- tage->page = page;
- atomic_inc(&tage_allocated);
- return tage;
-}
-
-static void tage_free(struct trace_page *tage)
-{
- __LASSERT(tage != NULL);
- __LASSERT(tage->page != NULL);
-
- cfs_free_page(tage->page);
- cfs_free(tage);
- atomic_dec(&tage_allocated);
-}
-
-static void tage_to_tail(struct trace_page *tage, struct list_head *queue)
-{
- __LASSERT(tage != NULL);
- __LASSERT(queue != NULL);
-
- list_move_tail(&tage->linkage, queue);
-}
-
-int trace_refill_stock(struct trace_cpu_data *tcd, int gfp,
- struct list_head *stock)
-{
- int i;
-
- /*
- * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
- * from here: this will lead to infinite recursion.
- */
-
- for (i = 0; i + tcd->tcd_cur_stock_pages < TCD_STOCK_PAGES ; ++ i) {
- struct trace_page *tage;
-
- tage = tage_alloc(gfp);
- if (tage == NULL)
- break;
- list_add_tail(&tage->linkage, stock);
- }
- return i;
-}
-
-/* return a page that has 'len' bytes left at the end */
-static struct trace_page *trace_get_tage_try(struct trace_cpu_data *tcd,
- unsigned long len)
-{
- struct trace_page *tage;
-
- if (tcd->tcd_cur_pages > 0) {
- __LASSERT(!list_empty(&tcd->tcd_pages));
- tage = tage_from_list(tcd->tcd_pages.prev);
- if (tage->used + len <= CFS_PAGE_SIZE)
- return tage;
- }
-
- if (tcd->tcd_cur_pages < tcd->tcd_max_pages) {
- if (tcd->tcd_cur_stock_pages > 0) {
- tage = tage_from_list(tcd->tcd_stock_pages.prev);
- -- tcd->tcd_cur_stock_pages;
- list_del_init(&tage->linkage);
- } else {
- tage = tage_alloc(CFS_ALLOC_ATOMIC);
- if (tage == NULL) {
- printk(KERN_WARNING
- "failure to allocate a tage (%ld)\n",
- tcd->tcd_cur_pages);
- return NULL;
- }
- }
-
- tage->used = 0;
- tage->cpu = smp_processor_id();
- tage->type = tcd->tcd_type;
- list_add_tail(&tage->linkage, &tcd->tcd_pages);
- tcd->tcd_cur_pages++;
-
- if (tcd->tcd_cur_pages > 8 && thread_running) {
- struct tracefiled_ctl *tctl = &trace_tctl;
- /*
- * wake up tracefiled to process some pages.
- */
- cfs_waitq_signal(&tctl->tctl_waitq);
- }
- return tage;
- }
- return NULL;
-}
-
-static void tcd_shrink(struct trace_cpu_data *tcd)
-{
- int pgcount = tcd->tcd_cur_pages / 10;
- struct page_collection pc;
- struct trace_page *tage;
- struct trace_page *tmp;
-
- /*
- * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
- * from here: this will lead to infinite recursion.
- */
-
- printk(KERN_WARNING "debug daemon buffer overflowed; discarding"
- " 10%% of pages (%d of %ld)\n", pgcount + 1, tcd->tcd_cur_pages);
-
- CFS_INIT_LIST_HEAD(&pc.pc_pages);
- spin_lock_init(&pc.pc_lock);
-
- list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, linkage) {
- if (pgcount-- == 0)
- break;
-
- list_move_tail(&tage->linkage, &pc.pc_pages);
- tcd->tcd_cur_pages--;
- }
- put_pages_on_tcd_daemon_list(&pc, tcd);
-}
-
-/* return a page that has 'len' bytes left at the end */
-static struct trace_page *trace_get_tage(struct trace_cpu_data *tcd,
- unsigned long len)
-{
- struct trace_page *tage;
-
- /*
- * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
- * from here: this will lead to infinite recursion.
- */
-
- if (len > CFS_PAGE_SIZE) {
- printk(KERN_ERR
- "cowardly refusing to write %lu bytes in a page\n", len);
- return NULL;
- }
-
- tage = trace_get_tage_try(tcd, len);
- if (tage != NULL)
- return tage;
- if (thread_running)
- tcd_shrink(tcd);
- if (tcd->tcd_cur_pages > 0) {
- tage = tage_from_list(tcd->tcd_pages.next);
- tage->used = 0;
- tage_to_tail(tage, &tcd->tcd_pages);
- }
- return tage;
-}
-
-int libcfs_debug_vmsg2(cfs_debug_limit_state_t *cdls, int subsys, int mask,
- const char *file, const char *fn, const int line,
- const char *format1, va_list args,
- const char *format2, ...)
-{
- struct trace_cpu_data *tcd = NULL;
- struct ptldebug_header header;
- struct trace_page *tage;
- /* string_buf is used only if tcd != NULL, and is always set then */
- char *string_buf = NULL;
- char *debug_buf;
- int known_size;
- int needed = 85; /* average message length */
- int max_nob;
- va_list ap;
- int depth;
- int i;
- int remain;
-
- if (strchr(file, '/'))
- file = strrchr(file, '/') + 1;
-
-
- set_ptldebug_header(&header, subsys, mask, line, CDEBUG_STACK());
-
- tcd = trace_get_tcd();
- if (tcd == NULL) /* arch may not log in IRQ context */
- goto console;
-
- if (tcd->tcd_shutting_down) {
- trace_put_tcd(tcd);
- tcd = NULL;
- goto console;
- }
-
- depth = __current_nesting_level();
- known_size = strlen(file) + 1 + depth;
- if (fn)
- known_size += strlen(fn) + 1;
-
- if (libcfs_debug_binary)
- known_size += sizeof(header);
-
- /*/
- * '2' used because vsnprintf return real size required for output
- * _without_ terminating NULL.
- * if needed is to small for this format.
- */
- for (i=0;i<2;i++) {
- tage = trace_get_tage(tcd, needed + known_size + 1);
- if (tage == NULL) {
- if (needed + known_size > CFS_PAGE_SIZE)
- mask |= D_ERROR;
-
- trace_put_tcd(tcd);
- tcd = NULL;
- goto console;
- }
-
- string_buf = (char *)cfs_page_address(tage->page)+tage->used+known_size;
-
- max_nob = CFS_PAGE_SIZE - tage->used - known_size;
- if (max_nob <= 0) {
- printk(KERN_EMERG "negative max_nob: %i\n", max_nob);
- mask |= D_ERROR;
- trace_put_tcd(tcd);
- tcd = NULL;
- goto console;
- }
-
- needed = 0;
- if (format1) {
- va_copy(ap, args);
- needed = vsnprintf(string_buf, max_nob, format1, ap);
- va_end(ap);
- }
-
-
- if (format2) {
- remain = max_nob - needed;
- if (remain < 0)
- remain = 0;
-
- va_start(ap, format2);
- needed += vsnprintf(string_buf+needed, remain, format2, ap);
- va_end(ap);
- }
-
- if (needed < max_nob) /* well. printing ok.. */
- break;
- }
-
- if (*(string_buf+needed-1) != '\n')
- printk(KERN_INFO "format at %s:%d:%s doesn't end in newline\n",
- file, line, fn);
-
- header.ph_len = known_size + needed;
- debug_buf = (char *)cfs_page_address(tage->page) + tage->used;
-
- if (libcfs_debug_binary) {
- memcpy(debug_buf, &header, sizeof(header));
- tage->used += sizeof(header);
- debug_buf += sizeof(header);
- }
-
- /* indent message according to the nesting level */
- while (depth-- > 0) {
- *(debug_buf++) = '.';
- ++ tage->used;
- }
-
- strcpy(debug_buf, file);
- tage->used += strlen(file) + 1;
- debug_buf += strlen(file) + 1;
-
- if (fn) {
- strcpy(debug_buf, fn);
- tage->used += strlen(fn) + 1;
- debug_buf += strlen(fn) + 1;
- }
-
- __LASSERT(debug_buf == string_buf);
-
- tage->used += needed;
- __LASSERT (tage->used <= CFS_PAGE_SIZE);
-
-console:
- if ((mask & libcfs_printk) == 0) {
- /* no console output requested */
- if (tcd != NULL)
- trace_put_tcd(tcd);
- return 1;
- }
-
- if (cdls != NULL) {
- if (libcfs_console_ratelimit &&
- cdls->cdls_next != 0 && /* not first time ever */
- !cfs_time_after(cfs_time_current(), cdls->cdls_next)) {
- /* skipping a console message */
- cdls->cdls_count++;
- if (tcd != NULL)
- trace_put_tcd(tcd);
- return 1;
- }
-
- if (cfs_time_after(cfs_time_current(), cdls->cdls_next +
- libcfs_console_max_delay
- + cfs_time_seconds(10))) {
- /* last timeout was a long time ago */
- cdls->cdls_delay /= libcfs_console_backoff * 4;
- } else {
- cdls->cdls_delay *= libcfs_console_backoff;
-
- if (cdls->cdls_delay < libcfs_console_min_delay)
- 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)
- nob = usr_buffer_nob;
-
- if (copy_to_user(usr_buffer, knl_buffer, nob))
- return -EFAULT;
-
- if (append != NULL && nob < usr_buffer_nob) {
- if (copy_to_user(usr_buffer + nob, append, 1))
- return -EFAULT;
-
- nob++;
- }
-
- return nob;
-}
-
-int trace_allocate_string_buffer(char **str, int nob)
-{
- if (nob > 2 * CFS_PAGE_SIZE) /* string must be "sensible" */
- return -EINVAL;
-
- *str = cfs_alloc(nob, CFS_ALLOC_STD | CFS_ALLOC_ZERO);
- if (*str == NULL)
- return -ENOMEM;
-
- return 0;
-}
-
-void trace_free_string_buffer(char *str, int nob)
-{
- cfs_free(str);
-}
-
-int trace_dump_debug_buffer_usrstr(void *usr_str, int usr_str_nob)
-{
- char *str;
- int rc;
-
- rc = trace_allocate_string_buffer(&str, usr_str_nob + 1);
- if (rc != 0)
- return rc;
-
- rc = trace_copyin_string(str, usr_str_nob + 1,
- usr_str, usr_str_nob);
- if (rc != 0)
- goto out;
-
-#if !defined(__WINNT__)
- if (str[0] != '/') {
- rc = -EINVAL;
- goto out;
- }
-#endif
- rc = tracefile_dump_all_pages(str);
-out:
- trace_free_string_buffer(str, usr_str_nob + 1);
- return rc;
-}
-
-int trace_daemon_command(char *str)
-{
- int rc = 0;
-
- tracefile_write_lock();
-
- if (strcmp(str, "stop") == 0) {
- trace_stop_thread();
- memset(tracefile, 0, sizeof(tracefile));
-
- } else if (strncmp(str, "size=", 5) == 0) {
- tracefile_size = simple_strtoul(str + 5, NULL, 0);
- if (tracefile_size < 10 || tracefile_size > 20480)
- tracefile_size = TRACEFILE_SIZE;
- else
- tracefile_size <<= 20;
-
- } else if (strlen(str) >= sizeof(tracefile)) {
- rc = -ENAMETOOLONG;
-#ifndef __WINNT__
- } else if (str[0] != '/') {
- rc = -EINVAL;
-#endif
- } else {
- strcpy(tracefile, str);
-
- printk(KERN_INFO "Lustre: debug daemon will attempt to start writing "
- "to %s (%lukB max)\n", tracefile,
- (long)(tracefile_size >> 10));
-
- trace_start_thread();
- }
-
- tracefile_write_unlock();
- return rc;
-}
-
-int trace_daemon_command_usrstr(void *usr_str, int usr_str_nob)
-{
- char *str;
- int rc;
-
- rc = trace_allocate_string_buffer(&str, usr_str_nob + 1);
- if (rc != 0)
- return rc;
-
- rc = trace_copyin_string(str, usr_str_nob + 1,
- usr_str, usr_str_nob);
- if (rc == 0)
- rc = trace_daemon_command(str);
-
- trace_free_string_buffer(str, usr_str_nob + 1);
- return rc;
-}
-
-int trace_set_debug_mb(int mb)
-{
- int i;
- int j;
- int pages;
- int limit = trace_max_debug_mb();
- struct trace_cpu_data *tcd;
-
- if (mb < num_possible_cpus())
- return -EINVAL;
-
- if (mb > limit) {
- printk(KERN_ERR "Lustre: Refusing to set debug buffer size to "
- "%dMB - limit is %d\n", mb, limit);
- return -EINVAL;
- }
-
- mb /= num_possible_cpus();
- pages = mb << (20 - CFS_PAGE_SHIFT);
-
- tracefile_write_lock();
-
- tcd_for_each(tcd, i, j)
- tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100;
-
- tracefile_write_unlock();
-
- return 0;
-}
-
-int trace_set_debug_mb_usrstr(void *usr_str, int usr_str_nob)
-{
- char str[32];
- int rc;
-
- rc = trace_copyin_string(str, sizeof(str), usr_str, usr_str_nob);
- if (rc < 0)
- return rc;
-
- return trace_set_debug_mb(simple_strtoul(str, NULL, 0));
-}
-
-int trace_get_debug_mb(void)
-{
- int i;
- int j;
- struct trace_cpu_data *tcd;
- int total_pages = 0;
-
- tracefile_read_lock();
-
- tcd_for_each(tcd, i, j)
- total_pages += tcd->tcd_max_pages;
-
- tracefile_read_unlock();
-
- return (total_pages >> (20 - CFS_PAGE_SHIFT)) + 1;
-}
-
-static int tracefiled(void *arg)
-{
- struct page_collection pc;
- struct tracefiled_ctl *tctl = arg;
- struct trace_page *tage;
- struct trace_page *tmp;
- struct ptldebug_header *hdr;
- cfs_file_t *filp;
- int rc;
-
- CFS_DECL_MMSPACE;
-
- /* we're started late enough that we pick up init's fs context */
- /* this is so broken in uml? what on earth is going on? */
- cfs_daemonize("ktracefiled");
-
- spin_lock_init(&pc.pc_lock);
- complete(&tctl->tctl_start);
-
- while (1) {
- cfs_waitlink_t __wait;
-
- cfs_waitlink_init(&__wait);
- cfs_waitq_add(&tctl->tctl_waitq, &__wait);
- set_current_state(TASK_INTERRUPTIBLE);
- cfs_waitq_timedwait(&__wait, CFS_TASK_INTERRUPTIBLE,
- cfs_time_seconds(1));
- cfs_waitq_del(&tctl->tctl_waitq, &__wait);
-
- if (atomic_read(&tctl->tctl_shutdown))
- break;
-
- pc.pc_want_daemon_pages = 0;
- collect_pages(&pc);
- if (list_empty(&pc.pc_pages))
- continue;
-
- filp = NULL;
- tracefile_read_lock();
- if (tracefile[0] != 0) {
- filp = cfs_filp_open(tracefile,
- O_CREAT | O_RDWR | O_LARGEFILE,
- 0600, &rc);
- if (!(filp))
- printk(KERN_WARNING "couldn't open %s: %d\n",
- tracefile, rc);
- }
- tracefile_read_unlock();
- if (filp == NULL) {
- put_pages_on_daemon_list(&pc);
- __LASSERT(list_empty(&pc.pc_pages));
- continue;
- }
-
- CFS_MMSPACE_OPEN;
-
- /* mark the first header, so we can sort in chunks */
- tage = tage_from_list(pc.pc_pages.next);
- __LASSERT_TAGE_INVARIANT(tage);
-
- hdr = cfs_page_address(tage->page);
- hdr->ph_flags |= PH_FLAG_FIRST_RECORD;
-
- list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {
- static loff_t f_pos;
-
- __LASSERT_TAGE_INVARIANT(tage);
-
- if (f_pos >= (off_t)tracefile_size)
- f_pos = 0;
- else if (f_pos > cfs_filp_size(filp))
- f_pos = cfs_filp_size(filp);
-
- rc = cfs_filp_write(filp, cfs_page_address(tage->page),
- tage->used, &f_pos);
- 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));
- }
- }
- CFS_MMSPACE_CLOSE;
-
- cfs_filp_close(filp);
- put_pages_on_daemon_list(&pc);
- __LASSERT(list_empty(&pc.pc_pages));
- }
- complete(&tctl->tctl_stop);
- return 0;
-}
-
-int trace_start_thread(void)
-{
- struct tracefiled_ctl *tctl = &trace_tctl;
- int rc = 0;
-
- mutex_down(&trace_thread_sem);
- if (thread_running)
- goto out;
-
- init_completion(&tctl->tctl_start);
- init_completion(&tctl->tctl_stop);
- cfs_waitq_init(&tctl->tctl_waitq);
- atomic_set(&tctl->tctl_shutdown, 0);
-
- if (cfs_kernel_thread(tracefiled, tctl, 0) < 0) {
- rc = -ECHILD;
- goto out;
- }
-
- wait_for_completion(&tctl->tctl_start);
- thread_running = 1;
-out:
- mutex_up(&trace_thread_sem);
- return rc;
-}
-
-void trace_stop_thread(void)
-{
- struct tracefiled_ctl *tctl = &trace_tctl;
-
- mutex_down(&trace_thread_sem);
- if (thread_running) {
- printk(KERN_INFO "Lustre: shutting down debug daemon thread...\n");
- atomic_set(&tctl->tctl_shutdown, 1);
- wait_for_completion(&tctl->tctl_stop);
- thread_running = 0;
- }
- mutex_up(&trace_thread_sem);
-}
-
-int tracefile_init(int max_pages)
-{
- struct trace_cpu_data *tcd;
- int i;
- int j;
- int rc;
- int factor;
-
- rc = tracefile_init_arch();
- if (rc != 0)
- return rc;
-
- tcd_for_each(tcd, i, j) {
- /* tcd_pages_factor is initialized int tracefile_init_arch. */
- factor = tcd->tcd_pages_factor;
- CFS_INIT_LIST_HEAD(&tcd->tcd_pages);
- CFS_INIT_LIST_HEAD(&tcd->tcd_stock_pages);
- CFS_INIT_LIST_HEAD(&tcd->tcd_daemon_pages);
- tcd->tcd_cur_pages = 0;
- tcd->tcd_cur_stock_pages = 0;
- tcd->tcd_cur_daemon_pages = 0;
- tcd->tcd_max_pages = (max_pages * factor) / 100;
- LASSERT(tcd->tcd_max_pages > 0);
- tcd->tcd_shutting_down = 0;
- }
-
- return 0;
-}
-
-static void trace_cleanup_on_cpu(void *info)
-{
- struct trace_cpu_data *tcd;
- struct trace_page *tage;
- struct trace_page *tmp;
- int i;
-
- tcd_for_each_type_lock(tcd, i) {
- tcd->tcd_shutting_down = 1;
-
- list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, linkage) {
- __LASSERT_TAGE_INVARIANT(tage);
-
- list_del(&tage->linkage);
- tage_free(tage);
- }
- tcd->tcd_cur_pages = 0;
- }
-}
-
-static void trace_cleanup(void)
-{
- struct page_collection pc;
-
- CFS_INIT_LIST_HEAD(&pc.pc_pages);
- spin_lock_init(&pc.pc_lock);
-
- trace_call_on_all_cpus(trace_cleanup_on_cpu, &pc);
-
- tracefile_fini_arch();
-}
-
-void tracefile_exit(void)
-{
- trace_stop_thread();
- trace_cleanup();
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff