diff options
Diffstat (limited to 'kernel/drivers/block/drbd/drbd_proc.c')
| -rw-r--r-- | kernel/drivers/block/drbd/drbd_proc.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/kernel/drivers/block/drbd/drbd_proc.c b/kernel/drivers/block/drbd/drbd_proc.c new file mode 100644 index 000000000..3b10fa6cb --- /dev/null +++ b/kernel/drivers/block/drbd/drbd_proc.c @@ -0,0 +1,368 @@ +/* + drbd_proc.c + + This file is part of DRBD by Philipp Reisner and Lars Ellenberg. + + Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. + Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. + Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. + + drbd is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + drbd 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 drbd; see the file COPYING. If not, write to + the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + */ + +#include <linux/module.h> + +#include <asm/uaccess.h> +#include <linux/fs.h> +#include <linux/file.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/drbd.h> +#include "drbd_int.h" + +static int drbd_proc_open(struct inode *inode, struct file *file); +static int drbd_proc_release(struct inode *inode, struct file *file); + + +struct proc_dir_entry *drbd_proc; +const struct file_operations drbd_proc_fops = { + .owner = THIS_MODULE, + .open = drbd_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = drbd_proc_release, +}; + +static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v) +{ + /* v is in kB/sec. We don't expect TiByte/sec yet. */ + if (unlikely(v >= 1000000)) { + /* cool: > GiByte/s */ + seq_printf(seq, "%ld,", v / 1000000); + v %= 1000000; + seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000); + } else if (likely(v >= 1000)) + seq_printf(seq, "%ld,%03ld", v/1000, v % 1000); + else + seq_printf(seq, "%ld", v); +} + +static void drbd_get_syncer_progress(struct drbd_device *device, + union drbd_dev_state state, unsigned long *rs_total, + unsigned long *bits_left, unsigned int *per_mil_done) +{ + /* this is to break it at compile time when we change that, in case we + * want to support more than (1<<32) bits on a 32bit arch. */ + typecheck(unsigned long, device->rs_total); + *rs_total = device->rs_total; + + /* note: both rs_total and rs_left are in bits, i.e. in + * units of BM_BLOCK_SIZE. + * for the percentage, we don't care. */ + + if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T) + *bits_left = device->ov_left; + else + *bits_left = drbd_bm_total_weight(device) - device->rs_failed; + /* >> 10 to prevent overflow, + * +1 to prevent division by zero */ + if (*bits_left > *rs_total) { + /* D'oh. Maybe a logic bug somewhere. More likely just a race + * between state change and reset of rs_total. + */ + *bits_left = *rs_total; + *per_mil_done = *rs_total ? 0 : 1000; + } else { + /* Make sure the division happens in long context. + * We allow up to one petabyte storage right now, + * at a granularity of 4k per bit that is 2**38 bits. + * After shift right and multiplication by 1000, + * this should still fit easily into a 32bit long, + * so we don't need a 64bit division on 32bit arch. + * Note: currently we don't support such large bitmaps on 32bit + * arch anyways, but no harm done to be prepared for it here. + */ + unsigned int shift = *rs_total > UINT_MAX ? 16 : 10; + unsigned long left = *bits_left >> shift; + unsigned long total = 1UL + (*rs_total >> shift); + unsigned long tmp = 1000UL - left * 1000UL/total; + *per_mil_done = tmp; + } +} + + +/*lge + * progress bars shamelessly adapted from driver/md/md.c + * output looks like + * [=====>..............] 33.5% (23456/123456) + * finish: 2:20:20 speed: 6,345 (6,456) K/sec + */ +static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq, + union drbd_dev_state state) +{ + unsigned long db, dt, dbdt, rt, rs_total, rs_left; + unsigned int res; + int i, x, y; + int stalled = 0; + + drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res); + + x = res/50; + y = 20-x; + seq_printf(seq, "\t["); + for (i = 1; i < x; i++) + seq_printf(seq, "="); + seq_printf(seq, ">"); + for (i = 0; i < y; i++) + seq_printf(seq, "."); + seq_printf(seq, "] "); + + if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T) + seq_printf(seq, "verified:"); + else + seq_printf(seq, "sync'ed:"); + seq_printf(seq, "%3u.%u%% ", res / 10, res % 10); + + /* if more than a few GB, display in MB */ + if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT))) + seq_printf(seq, "(%lu/%lu)M", + (unsigned long) Bit2KB(rs_left >> 10), + (unsigned long) Bit2KB(rs_total >> 10)); + else + seq_printf(seq, "(%lu/%lu)K", + (unsigned long) Bit2KB(rs_left), + (unsigned long) Bit2KB(rs_total)); + + seq_printf(seq, "\n\t"); + + /* see drivers/md/md.c + * We do not want to overflow, so the order of operands and + * the * 100 / 100 trick are important. We do a +1 to be + * safe against division by zero. We only estimate anyway. + * + * dt: time from mark until now + * db: blocks written from mark until now + * rt: remaining time + */ + /* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is + * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at + * least DRBD_SYNC_MARK_STEP time before it will be modified. */ + /* ------------------------ ~18s average ------------------------ */ + i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS; + dt = (jiffies - device->rs_mark_time[i]) / HZ; + if (dt > 180) + stalled = 1; + + if (!dt) + dt++; + db = device->rs_mark_left[i] - rs_left; + rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */ + + seq_printf(seq, "finish: %lu:%02lu:%02lu", + rt / 3600, (rt % 3600) / 60, rt % 60); + + dbdt = Bit2KB(db/dt); + seq_printf(seq, " speed: "); + seq_printf_with_thousands_grouping(seq, dbdt); + seq_printf(seq, " ("); + /* ------------------------- ~3s average ------------------------ */ + if (proc_details >= 1) { + /* this is what drbd_rs_should_slow_down() uses */ + i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; + dt = (jiffies - device->rs_mark_time[i]) / HZ; + if (!dt) + dt++; + db = device->rs_mark_left[i] - rs_left; + dbdt = Bit2KB(db/dt); + seq_printf_with_thousands_grouping(seq, dbdt); + seq_printf(seq, " -- "); + } + + /* --------------------- long term average ---------------------- */ + /* mean speed since syncer started + * we do account for PausedSync periods */ + dt = (jiffies - device->rs_start - device->rs_paused) / HZ; + if (dt == 0) + dt = 1; + db = rs_total - rs_left; + dbdt = Bit2KB(db/dt); + seq_printf_with_thousands_grouping(seq, dbdt); + seq_printf(seq, ")"); + + if (state.conn == C_SYNC_TARGET || + state.conn == C_VERIFY_S) { + seq_printf(seq, " want: "); + seq_printf_with_thousands_grouping(seq, device->c_sync_rate); + } + seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : ""); + + if (proc_details >= 1) { + /* 64 bit: + * we convert to sectors in the display below. */ + unsigned long bm_bits = drbd_bm_bits(device); + unsigned long bit_pos; + unsigned long long stop_sector = 0; + if (state.conn == C_VERIFY_S || + state.conn == C_VERIFY_T) { + bit_pos = bm_bits - device->ov_left; + if (verify_can_do_stop_sector(device)) + stop_sector = device->ov_stop_sector; + } else + bit_pos = device->bm_resync_fo; + /* Total sectors may be slightly off for oddly + * sized devices. So what. */ + seq_printf(seq, + "\t%3d%% sector pos: %llu/%llu", + (int)(bit_pos / (bm_bits/100+1)), + (unsigned long long)bit_pos * BM_SECT_PER_BIT, + (unsigned long long)bm_bits * BM_SECT_PER_BIT); + if (stop_sector != 0 && stop_sector != ULLONG_MAX) + seq_printf(seq, " stop sector: %llu", stop_sector); + seq_printf(seq, "\n"); + } +} + +static int drbd_seq_show(struct seq_file *seq, void *v) +{ + int i, prev_i = -1; + const char *sn; + struct drbd_device *device; + struct net_conf *nc; + union drbd_dev_state state; + char wp; + + static char write_ordering_chars[] = { + [WO_none] = 'n', + [WO_drain_io] = 'd', + [WO_bdev_flush] = 'f', + }; + + seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n", + API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag()); + + /* + cs .. connection state + ro .. node role (local/remote) + ds .. disk state (local/remote) + protocol + various flags + ns .. network send + nr .. network receive + dw .. disk write + dr .. disk read + al .. activity log write count + bm .. bitmap update write count + pe .. pending (waiting for ack or data reply) + ua .. unack'd (still need to send ack or data reply) + ap .. application requests accepted, but not yet completed + ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending + wo .. write ordering mode currently in use + oos .. known out-of-sync kB + */ + + rcu_read_lock(); + idr_for_each_entry(&drbd_devices, device, i) { + if (prev_i != i - 1) + seq_printf(seq, "\n"); + prev_i = i; + + state = device->state; + sn = drbd_conn_str(state.conn); + + if (state.conn == C_STANDALONE && + state.disk == D_DISKLESS && + state.role == R_SECONDARY) { + seq_printf(seq, "%2d: cs:Unconfigured\n", i); + } else { + /* reset device->congestion_reason */ + bdi_rw_congested(&device->rq_queue->backing_dev_info); + + nc = rcu_dereference(first_peer_device(device)->connection->net_conf); + wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' '; + seq_printf(seq, + "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n" + " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u " + "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c", + i, sn, + drbd_role_str(state.role), + drbd_role_str(state.peer), + drbd_disk_str(state.disk), + drbd_disk_str(state.pdsk), + wp, + drbd_suspended(device) ? 's' : 'r', + state.aftr_isp ? 'a' : '-', + state.peer_isp ? 'p' : '-', + state.user_isp ? 'u' : '-', + device->congestion_reason ?: '-', + test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-', + device->send_cnt/2, + device->recv_cnt/2, + device->writ_cnt/2, + device->read_cnt/2, + device->al_writ_cnt, + device->bm_writ_cnt, + atomic_read(&device->local_cnt), + atomic_read(&device->ap_pending_cnt) + + atomic_read(&device->rs_pending_cnt), + atomic_read(&device->unacked_cnt), + atomic_read(&device->ap_bio_cnt), + first_peer_device(device)->connection->epochs, + write_ordering_chars[device->resource->write_ordering] + ); + seq_printf(seq, " oos:%llu\n", + Bit2KB((unsigned long long) + drbd_bm_total_weight(device))); + } + if (state.conn == C_SYNC_SOURCE || + state.conn == C_SYNC_TARGET || + state.conn == C_VERIFY_S || + state.conn == C_VERIFY_T) + drbd_syncer_progress(device, seq, state); + + if (proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) { + lc_seq_printf_stats(seq, device->resync); + lc_seq_printf_stats(seq, device->act_log); + put_ldev(device); + } + + if (proc_details >= 2) + seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt)); + } + rcu_read_unlock(); + + return 0; +} + +static int drbd_proc_open(struct inode *inode, struct file *file) +{ + int err; + + if (try_module_get(THIS_MODULE)) { + err = single_open(file, drbd_seq_show, NULL); + if (err) + module_put(THIS_MODULE); + return err; + } + return -ENODEV; +} + +static int drbd_proc_release(struct inode *inode, struct file *file) +{ + module_put(THIS_MODULE); + return single_release(inode, file); +} + +/* PROC FS stuff end */ |