diff options
Diffstat (limited to 'fs/dlm/debug_fs.c')
| -rw-r--r-- | fs/dlm/debug_fs.c | 726 |
1 files changed, 726 insertions, 0 deletions
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c new file mode 100644 index 00000000..1c9b0809 --- /dev/null +++ b/fs/dlm/debug_fs.c @@ -0,0 +1,726 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include <linux/pagemap.h> +#include <linux/seq_file.h> +#include <linux/module.h> +#include <linux/ctype.h> +#include <linux/debugfs.h> +#include <linux/slab.h> + +#include "dlm_internal.h" +#include "lock.h" + +#define DLM_DEBUG_BUF_LEN 4096 +static char debug_buf[DLM_DEBUG_BUF_LEN]; +static struct mutex debug_buf_lock; + +static struct dentry *dlm_root; + +static char *print_lockmode(int mode) +{ + switch (mode) { + case DLM_LOCK_IV: + return "--"; + case DLM_LOCK_NL: + return "NL"; + case DLM_LOCK_CR: + return "CR"; + case DLM_LOCK_CW: + return "CW"; + case DLM_LOCK_PR: + return "PR"; + case DLM_LOCK_PW: + return "PW"; + case DLM_LOCK_EX: + return "EX"; + default: + return "??"; + } +} + +static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb, + struct dlm_rsb *res) +{ + seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode)); + + if (lkb->lkb_status == DLM_LKSTS_CONVERT || + lkb->lkb_status == DLM_LKSTS_WAITING) + seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode)); + + if (lkb->lkb_nodeid) { + if (lkb->lkb_nodeid != res->res_nodeid) + seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid, + lkb->lkb_remid); + else + seq_printf(s, " Master: %08x", lkb->lkb_remid); + } + + if (lkb->lkb_wait_type) + seq_printf(s, " wait_type: %d", lkb->lkb_wait_type); + + return seq_printf(s, "\n"); +} + +static int print_format1(struct dlm_rsb *res, struct seq_file *s) +{ + struct dlm_lkb *lkb; + int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list; + int rv; + + lock_rsb(res); + + rv = seq_printf(s, "\nResource %p Name (len=%d) \"", + res, res->res_length); + if (rv) + goto out; + + for (i = 0; i < res->res_length; i++) { + if (isprint(res->res_name[i])) + seq_printf(s, "%c", res->res_name[i]); + else + seq_printf(s, "%c", '.'); + } + + if (res->res_nodeid > 0) + rv = seq_printf(s, "\" \nLocal Copy, Master is node %d\n", + res->res_nodeid); + else if (res->res_nodeid == 0) + rv = seq_printf(s, "\" \nMaster Copy\n"); + else if (res->res_nodeid == -1) + rv = seq_printf(s, "\" \nLooking up master (lkid %x)\n", + res->res_first_lkid); + else + rv = seq_printf(s, "\" \nInvalid master %d\n", + res->res_nodeid); + if (rv) + goto out; + + /* Print the LVB: */ + if (res->res_lvbptr) { + seq_printf(s, "LVB: "); + for (i = 0; i < lvblen; i++) { + if (i == lvblen / 2) + seq_printf(s, "\n "); + seq_printf(s, "%02x ", + (unsigned char) res->res_lvbptr[i]); + } + if (rsb_flag(res, RSB_VALNOTVALID)) + seq_printf(s, " (INVALID)"); + rv = seq_printf(s, "\n"); + if (rv) + goto out; + } + + root_list = !list_empty(&res->res_root_list); + recover_list = !list_empty(&res->res_recover_list); + + if (root_list || recover_list) { + rv = seq_printf(s, "Recovery: root %d recover %d flags %lx " + "count %d\n", root_list, recover_list, + res->res_flags, res->res_recover_locks_count); + if (rv) + goto out; + } + + /* Print the locks attached to this resource */ + seq_printf(s, "Granted Queue\n"); + list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) { + rv = print_format1_lock(s, lkb, res); + if (rv) + goto out; + } + + seq_printf(s, "Conversion Queue\n"); + list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) { + rv = print_format1_lock(s, lkb, res); + if (rv) + goto out; + } + + seq_printf(s, "Waiting Queue\n"); + list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) { + rv = print_format1_lock(s, lkb, res); + if (rv) + goto out; + } + + if (list_empty(&res->res_lookup)) + goto out; + + seq_printf(s, "Lookup Queue\n"); + list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) { + rv = seq_printf(s, "%08x %s", lkb->lkb_id, + print_lockmode(lkb->lkb_rqmode)); + if (lkb->lkb_wait_type) + seq_printf(s, " wait_type: %d", lkb->lkb_wait_type); + rv = seq_printf(s, "\n"); + } + out: + unlock_rsb(res); + return rv; +} + +static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb, + struct dlm_rsb *r) +{ + u64 xid = 0; + u64 us; + int rv; + + if (lkb->lkb_flags & DLM_IFL_USER) { + if (lkb->lkb_ua) + xid = lkb->lkb_ua->xid; + } + + /* microseconds since lkb was added to current queue */ + us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp)); + + /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us + r_nodeid r_len r_name */ + + rv = seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n", + lkb->lkb_id, + lkb->lkb_nodeid, + lkb->lkb_remid, + lkb->lkb_ownpid, + (unsigned long long)xid, + lkb->lkb_exflags, + lkb->lkb_flags, + lkb->lkb_status, + lkb->lkb_grmode, + lkb->lkb_rqmode, + (unsigned long long)us, + r->res_nodeid, + r->res_length, + r->res_name); + return rv; +} + +static int print_format2(struct dlm_rsb *r, struct seq_file *s) +{ + struct dlm_lkb *lkb; + int rv = 0; + + lock_rsb(r); + + list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) { + rv = print_format2_lock(s, lkb, r); + if (rv) + goto out; + } + + list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) { + rv = print_format2_lock(s, lkb, r); + if (rv) + goto out; + } + + list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) { + rv = print_format2_lock(s, lkb, r); + if (rv) + goto out; + } + out: + unlock_rsb(r); + return rv; +} + +static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb, + int rsb_lookup) +{ + u64 xid = 0; + int rv; + + if (lkb->lkb_flags & DLM_IFL_USER) { + if (lkb->lkb_ua) + xid = lkb->lkb_ua->xid; + } + + rv = seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n", + lkb->lkb_id, + lkb->lkb_nodeid, + lkb->lkb_remid, + lkb->lkb_ownpid, + (unsigned long long)xid, + lkb->lkb_exflags, + lkb->lkb_flags, + lkb->lkb_status, + lkb->lkb_grmode, + lkb->lkb_rqmode, + lkb->lkb_last_bast.mode, + rsb_lookup, + lkb->lkb_wait_type, + lkb->lkb_lvbseq, + (unsigned long long)ktime_to_ns(lkb->lkb_timestamp), + (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time)); + return rv; +} + +static int print_format3(struct dlm_rsb *r, struct seq_file *s) +{ + struct dlm_lkb *lkb; + int i, lvblen = r->res_ls->ls_lvblen; + int print_name = 1; + int rv; + + lock_rsb(r); + + rv = seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ", + r, + r->res_nodeid, + r->res_first_lkid, + r->res_flags, + !list_empty(&r->res_root_list), + !list_empty(&r->res_recover_list), + r->res_recover_locks_count, + r->res_length); + if (rv) + goto out; + + for (i = 0; i < r->res_length; i++) { + if (!isascii(r->res_name[i]) || !isprint(r->res_name[i])) + print_name = 0; + } + + seq_printf(s, "%s", print_name ? "str " : "hex"); + + for (i = 0; i < r->res_length; i++) { + if (print_name) + seq_printf(s, "%c", r->res_name[i]); + else + seq_printf(s, " %02x", (unsigned char)r->res_name[i]); + } + rv = seq_printf(s, "\n"); + if (rv) + goto out; + + if (!r->res_lvbptr) + goto do_locks; + + seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen); + + for (i = 0; i < lvblen; i++) + seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]); + rv = seq_printf(s, "\n"); + if (rv) + goto out; + + do_locks: + list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) { + rv = print_format3_lock(s, lkb, 0); + if (rv) + goto out; + } + + list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) { + rv = print_format3_lock(s, lkb, 0); + if (rv) + goto out; + } + + list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) { + rv = print_format3_lock(s, lkb, 0); + if (rv) + goto out; + } + + list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) { + rv = print_format3_lock(s, lkb, 1); + if (rv) + goto out; + } + out: + unlock_rsb(r); + return rv; +} + +struct rsbtbl_iter { + struct dlm_rsb *rsb; + unsigned bucket; + int format; + int header; +}; + +/* seq_printf returns -1 if the buffer is full, and 0 otherwise. + If the buffer is full, seq_printf can be called again, but it + does nothing and just returns -1. So, the these printing routines + periodically check the return value to avoid wasting too much time + trying to print to a full buffer. */ + +static int table_seq_show(struct seq_file *seq, void *iter_ptr) +{ + struct rsbtbl_iter *ri = iter_ptr; + int rv = 0; + + switch (ri->format) { + case 1: + rv = print_format1(ri->rsb, seq); + break; + case 2: + if (ri->header) { + seq_printf(seq, "id nodeid remid pid xid exflags " + "flags sts grmode rqmode time_ms " + "r_nodeid r_len r_name\n"); + ri->header = 0; + } + rv = print_format2(ri->rsb, seq); + break; + case 3: + if (ri->header) { + seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n"); + ri->header = 0; + } + rv = print_format3(ri->rsb, seq); + break; + } + + return rv; +} + +static const struct seq_operations format1_seq_ops; +static const struct seq_operations format2_seq_ops; +static const struct seq_operations format3_seq_ops; + +static void *table_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct rb_node *node; + struct dlm_ls *ls = seq->private; + struct rsbtbl_iter *ri; + struct dlm_rsb *r; + loff_t n = *pos; + unsigned bucket, entry; + + bucket = n >> 32; + entry = n & ((1LL << 32) - 1); + + if (bucket >= ls->ls_rsbtbl_size) + return NULL; + + ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS); + if (!ri) + return NULL; + if (n == 0) + ri->header = 1; + if (seq->op == &format1_seq_ops) + ri->format = 1; + if (seq->op == &format2_seq_ops) + ri->format = 2; + if (seq->op == &format3_seq_ops) + ri->format = 3; + + spin_lock(&ls->ls_rsbtbl[bucket].lock); + if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { + for (node = rb_first(&ls->ls_rsbtbl[bucket].keep); node; + node = rb_next(node)) { + r = rb_entry(node, struct dlm_rsb, res_hashnode); + if (!entry--) { + dlm_hold_rsb(r); + ri->rsb = r; + ri->bucket = bucket; + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + return ri; + } + } + } + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + + /* + * move to the first rsb in the next non-empty bucket + */ + + /* zero the entry */ + n &= ~((1LL << 32) - 1); + + while (1) { + bucket++; + n += 1LL << 32; + + if (bucket >= ls->ls_rsbtbl_size) { + kfree(ri); + return NULL; + } + + spin_lock(&ls->ls_rsbtbl[bucket].lock); + if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { + node = rb_first(&ls->ls_rsbtbl[bucket].keep); + r = rb_entry(node, struct dlm_rsb, res_hashnode); + dlm_hold_rsb(r); + ri->rsb = r; + ri->bucket = bucket; + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + *pos = n; + return ri; + } + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + } +} + +static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos) +{ + struct dlm_ls *ls = seq->private; + struct rsbtbl_iter *ri = iter_ptr; + struct rb_node *next; + struct dlm_rsb *r, *rp; + loff_t n = *pos; + unsigned bucket; + + bucket = n >> 32; + + /* + * move to the next rsb in the same bucket + */ + + spin_lock(&ls->ls_rsbtbl[bucket].lock); + rp = ri->rsb; + next = rb_next(&rp->res_hashnode); + + if (next) { + r = rb_entry(next, struct dlm_rsb, res_hashnode); + dlm_hold_rsb(r); + ri->rsb = r; + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + dlm_put_rsb(rp); + ++*pos; + return ri; + } + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + dlm_put_rsb(rp); + + /* + * move to the first rsb in the next non-empty bucket + */ + + /* zero the entry */ + n &= ~((1LL << 32) - 1); + + while (1) { + bucket++; + n += 1LL << 32; + + if (bucket >= ls->ls_rsbtbl_size) { + kfree(ri); + return NULL; + } + + spin_lock(&ls->ls_rsbtbl[bucket].lock); + if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { + next = rb_first(&ls->ls_rsbtbl[bucket].keep); + r = rb_entry(next, struct dlm_rsb, res_hashnode); + dlm_hold_rsb(r); + ri->rsb = r; + ri->bucket = bucket; + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + *pos = n; + return ri; + } + spin_unlock(&ls->ls_rsbtbl[bucket].lock); + } +} + +static void table_seq_stop(struct seq_file *seq, void *iter_ptr) +{ + struct rsbtbl_iter *ri = iter_ptr; + + if (ri) { + dlm_put_rsb(ri->rsb); + kfree(ri); + } +} + +static const struct seq_operations format1_seq_ops = { + .start = table_seq_start, + .next = table_seq_next, + .stop = table_seq_stop, + .show = table_seq_show, +}; + +static const struct seq_operations format2_seq_ops = { + .start = table_seq_start, + .next = table_seq_next, + .stop = table_seq_stop, + .show = table_seq_show, +}; + +static const struct seq_operations format3_seq_ops = { + .start = table_seq_start, + .next = table_seq_next, + .stop = table_seq_stop, + .show = table_seq_show, +}; + +static const struct file_operations format1_fops; +static const struct file_operations format2_fops; +static const struct file_operations format3_fops; + +static int table_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int ret = -1; + + if (file->f_op == &format1_fops) + ret = seq_open(file, &format1_seq_ops); + else if (file->f_op == &format2_fops) + ret = seq_open(file, &format2_seq_ops); + else if (file->f_op == &format3_fops) + ret = seq_open(file, &format3_seq_ops); + + if (ret) + return ret; + + seq = file->private_data; + seq->private = inode->i_private; /* the dlm_ls */ + return 0; +} + +static const struct file_operations format1_fops = { + .owner = THIS_MODULE, + .open = table_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release +}; + +static const struct file_operations format2_fops = { + .owner = THIS_MODULE, + .open = table_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release +}; + +static const struct file_operations format3_fops = { + .owner = THIS_MODULE, + .open = table_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release +}; + +/* + * dump lkb's on the ls_waiters list + */ +static ssize_t waiters_read(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct dlm_ls *ls = file->private_data; + struct dlm_lkb *lkb; + size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv; + + mutex_lock(&debug_buf_lock); + mutex_lock(&ls->ls_waiters_mutex); + memset(debug_buf, 0, sizeof(debug_buf)); + + list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) { + ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n", + lkb->lkb_id, lkb->lkb_wait_type, + lkb->lkb_nodeid, lkb->lkb_resource->res_name); + if (ret >= len - pos) + break; + pos += ret; + } + mutex_unlock(&ls->ls_waiters_mutex); + + rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos); + mutex_unlock(&debug_buf_lock); + return rv; +} + +static const struct file_operations waiters_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = waiters_read, + .llseek = default_llseek, +}; + +void dlm_delete_debug_file(struct dlm_ls *ls) +{ + if (ls->ls_debug_rsb_dentry) + debugfs_remove(ls->ls_debug_rsb_dentry); + if (ls->ls_debug_waiters_dentry) + debugfs_remove(ls->ls_debug_waiters_dentry); + if (ls->ls_debug_locks_dentry) + debugfs_remove(ls->ls_debug_locks_dentry); + if (ls->ls_debug_all_dentry) + debugfs_remove(ls->ls_debug_all_dentry); +} + +int dlm_create_debug_file(struct dlm_ls *ls) +{ + char name[DLM_LOCKSPACE_LEN+8]; + + /* format 1 */ + + ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name, + S_IFREG | S_IRUGO, + dlm_root, + ls, + &format1_fops); + if (!ls->ls_debug_rsb_dentry) + goto fail; + + /* format 2 */ + + memset(name, 0, sizeof(name)); + snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name); + + ls->ls_debug_locks_dentry = debugfs_create_file(name, + S_IFREG | S_IRUGO, + dlm_root, + ls, + &format2_fops); + if (!ls->ls_debug_locks_dentry) + goto fail; + + /* format 3 */ + + memset(name, 0, sizeof(name)); + snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name); + + ls->ls_debug_all_dentry = debugfs_create_file(name, + S_IFREG | S_IRUGO, + dlm_root, + ls, + &format3_fops); + if (!ls->ls_debug_all_dentry) + goto fail; + + memset(name, 0, sizeof(name)); + snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name); + + ls->ls_debug_waiters_dentry = debugfs_create_file(name, + S_IFREG | S_IRUGO, + dlm_root, + ls, + &waiters_fops); + if (!ls->ls_debug_waiters_dentry) + goto fail; + + return 0; + + fail: + dlm_delete_debug_file(ls); + return -ENOMEM; +} + +int __init dlm_register_debugfs(void) +{ + mutex_init(&debug_buf_lock); + dlm_root = debugfs_create_dir("dlm", NULL); + return dlm_root ? 0 : -ENOMEM; +} + +void dlm_unregister_debugfs(void) +{ + debugfs_remove(dlm_root); +} + |