1 /* 2 drbd_proc.c 3 4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg. 5 6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. 7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. 8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. 9 10 drbd is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 2, or (at your option) 13 any later version. 14 15 drbd is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with drbd; see the file COPYING. If not, write to 22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 23 24 */ 25 26 #include <linux/module.h> 27 28 #include <asm/uaccess.h> 29 #include <linux/fs.h> 30 #include <linux/file.h> 31 #include <linux/proc_fs.h> 32 #include <linux/seq_file.h> 33 #include <linux/drbd.h> 34 #include "drbd_int.h" 35 36 static int drbd_proc_open(struct inode *inode, struct file *file); 37 static int drbd_proc_release(struct inode *inode, struct file *file); 38 39 40 struct proc_dir_entry *drbd_proc; 41 const struct file_operations drbd_proc_fops = { 42 .owner = THIS_MODULE, 43 .open = drbd_proc_open, 44 .read = seq_read, 45 .llseek = seq_lseek, 46 .release = drbd_proc_release, 47 }; 48 49 static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v) 50 { 51 /* v is in kB/sec. We don't expect TiByte/sec yet. */ 52 if (unlikely(v >= 1000000)) { 53 /* cool: > GiByte/s */ 54 seq_printf(seq, "%ld,", v / 1000000); 55 v %= 1000000; 56 seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000); 57 } else if (likely(v >= 1000)) 58 seq_printf(seq, "%ld,%03ld", v/1000, v % 1000); 59 else 60 seq_printf(seq, "%ld", v); 61 } 62 63 /*lge 64 * progress bars shamelessly adapted from driver/md/md.c 65 * output looks like 66 * [=====>..............] 33.5% (23456/123456) 67 * finish: 2:20:20 speed: 6,345 (6,456) K/sec 68 */ 69 static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq) 70 { 71 unsigned long db, dt, dbdt, rt, rs_left; 72 unsigned int res; 73 int i, x, y; 74 int stalled = 0; 75 76 drbd_get_syncer_progress(device, &rs_left, &res); 77 78 x = res/50; 79 y = 20-x; 80 seq_printf(seq, "\t["); 81 for (i = 1; i < x; i++) 82 seq_printf(seq, "="); 83 seq_printf(seq, ">"); 84 for (i = 0; i < y; i++) 85 seq_printf(seq, "."); 86 seq_printf(seq, "] "); 87 88 if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) 89 seq_printf(seq, "verified:"); 90 else 91 seq_printf(seq, "sync'ed:"); 92 seq_printf(seq, "%3u.%u%% ", res / 10, res % 10); 93 94 /* if more than a few GB, display in MB */ 95 if (device->rs_total > (4UL << (30 - BM_BLOCK_SHIFT))) 96 seq_printf(seq, "(%lu/%lu)M", 97 (unsigned long) Bit2KB(rs_left >> 10), 98 (unsigned long) Bit2KB(device->rs_total >> 10)); 99 else 100 seq_printf(seq, "(%lu/%lu)K\n\t", 101 (unsigned long) Bit2KB(rs_left), 102 (unsigned long) Bit2KB(device->rs_total)); 103 104 /* see drivers/md/md.c 105 * We do not want to overflow, so the order of operands and 106 * the * 100 / 100 trick are important. We do a +1 to be 107 * safe against division by zero. We only estimate anyway. 108 * 109 * dt: time from mark until now 110 * db: blocks written from mark until now 111 * rt: remaining time 112 */ 113 /* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is 114 * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at 115 * least DRBD_SYNC_MARK_STEP time before it will be modified. */ 116 /* ------------------------ ~18s average ------------------------ */ 117 i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS; 118 dt = (jiffies - device->rs_mark_time[i]) / HZ; 119 if (dt > 180) 120 stalled = 1; 121 122 if (!dt) 123 dt++; 124 db = device->rs_mark_left[i] - rs_left; 125 rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */ 126 127 seq_printf(seq, "finish: %lu:%02lu:%02lu", 128 rt / 3600, (rt % 3600) / 60, rt % 60); 129 130 dbdt = Bit2KB(db/dt); 131 seq_printf(seq, " speed: "); 132 seq_printf_with_thousands_grouping(seq, dbdt); 133 seq_printf(seq, " ("); 134 /* ------------------------- ~3s average ------------------------ */ 135 if (proc_details >= 1) { 136 /* this is what drbd_rs_should_slow_down() uses */ 137 i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 138 dt = (jiffies - device->rs_mark_time[i]) / HZ; 139 if (!dt) 140 dt++; 141 db = device->rs_mark_left[i] - rs_left; 142 dbdt = Bit2KB(db/dt); 143 seq_printf_with_thousands_grouping(seq, dbdt); 144 seq_printf(seq, " -- "); 145 } 146 147 /* --------------------- long term average ---------------------- */ 148 /* mean speed since syncer started 149 * we do account for PausedSync periods */ 150 dt = (jiffies - device->rs_start - device->rs_paused) / HZ; 151 if (dt == 0) 152 dt = 1; 153 db = device->rs_total - rs_left; 154 dbdt = Bit2KB(db/dt); 155 seq_printf_with_thousands_grouping(seq, dbdt); 156 seq_printf(seq, ")"); 157 158 if (device->state.conn == C_SYNC_TARGET || 159 device->state.conn == C_VERIFY_S) { 160 seq_printf(seq, " want: "); 161 seq_printf_with_thousands_grouping(seq, device->c_sync_rate); 162 } 163 seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : ""); 164 165 if (proc_details >= 1) { 166 /* 64 bit: 167 * we convert to sectors in the display below. */ 168 unsigned long bm_bits = drbd_bm_bits(device); 169 unsigned long bit_pos; 170 unsigned long long stop_sector = 0; 171 if (device->state.conn == C_VERIFY_S || 172 device->state.conn == C_VERIFY_T) { 173 bit_pos = bm_bits - device->ov_left; 174 if (verify_can_do_stop_sector(device)) 175 stop_sector = device->ov_stop_sector; 176 } else 177 bit_pos = device->bm_resync_fo; 178 /* Total sectors may be slightly off for oddly 179 * sized devices. So what. */ 180 seq_printf(seq, 181 "\t%3d%% sector pos: %llu/%llu", 182 (int)(bit_pos / (bm_bits/100+1)), 183 (unsigned long long)bit_pos * BM_SECT_PER_BIT, 184 (unsigned long long)bm_bits * BM_SECT_PER_BIT); 185 if (stop_sector != 0 && stop_sector != ULLONG_MAX) 186 seq_printf(seq, " stop sector: %llu", stop_sector); 187 seq_printf(seq, "\n"); 188 } 189 } 190 191 static void resync_dump_detail(struct seq_file *seq, struct lc_element *e) 192 { 193 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce); 194 195 seq_printf(seq, "%5d %s %s\n", bme->rs_left, 196 bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------", 197 bme->flags & BME_LOCKED ? "LOCKED" : "------" 198 ); 199 } 200 201 static int drbd_seq_show(struct seq_file *seq, void *v) 202 { 203 int i, prev_i = -1; 204 const char *sn; 205 struct drbd_device *device; 206 struct net_conf *nc; 207 char wp; 208 209 static char write_ordering_chars[] = { 210 [WO_none] = 'n', 211 [WO_drain_io] = 'd', 212 [WO_bdev_flush] = 'f', 213 }; 214 215 seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n", 216 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag()); 217 218 /* 219 cs .. connection state 220 ro .. node role (local/remote) 221 ds .. disk state (local/remote) 222 protocol 223 various flags 224 ns .. network send 225 nr .. network receive 226 dw .. disk write 227 dr .. disk read 228 al .. activity log write count 229 bm .. bitmap update write count 230 pe .. pending (waiting for ack or data reply) 231 ua .. unack'd (still need to send ack or data reply) 232 ap .. application requests accepted, but not yet completed 233 ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending 234 wo .. write ordering mode currently in use 235 oos .. known out-of-sync kB 236 */ 237 238 rcu_read_lock(); 239 idr_for_each_entry(&drbd_devices, device, i) { 240 if (prev_i != i - 1) 241 seq_printf(seq, "\n"); 242 prev_i = i; 243 244 sn = drbd_conn_str(device->state.conn); 245 246 if (device->state.conn == C_STANDALONE && 247 device->state.disk == D_DISKLESS && 248 device->state.role == R_SECONDARY) { 249 seq_printf(seq, "%2d: cs:Unconfigured\n", i); 250 } else { 251 /* reset device->congestion_reason */ 252 bdi_rw_congested(&device->rq_queue->backing_dev_info); 253 254 nc = rcu_dereference(first_peer_device(device)->connection->net_conf); 255 wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' '; 256 seq_printf(seq, 257 "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n" 258 " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u " 259 "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c", 260 i, sn, 261 drbd_role_str(device->state.role), 262 drbd_role_str(device->state.peer), 263 drbd_disk_str(device->state.disk), 264 drbd_disk_str(device->state.pdsk), 265 wp, 266 drbd_suspended(device) ? 's' : 'r', 267 device->state.aftr_isp ? 'a' : '-', 268 device->state.peer_isp ? 'p' : '-', 269 device->state.user_isp ? 'u' : '-', 270 device->congestion_reason ?: '-', 271 test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-', 272 device->send_cnt/2, 273 device->recv_cnt/2, 274 device->writ_cnt/2, 275 device->read_cnt/2, 276 device->al_writ_cnt, 277 device->bm_writ_cnt, 278 atomic_read(&device->local_cnt), 279 atomic_read(&device->ap_pending_cnt) + 280 atomic_read(&device->rs_pending_cnt), 281 atomic_read(&device->unacked_cnt), 282 atomic_read(&device->ap_bio_cnt), 283 first_peer_device(device)->connection->epochs, 284 write_ordering_chars[first_peer_device(device)->connection->write_ordering] 285 ); 286 seq_printf(seq, " oos:%llu\n", 287 Bit2KB((unsigned long long) 288 drbd_bm_total_weight(device))); 289 } 290 if (device->state.conn == C_SYNC_SOURCE || 291 device->state.conn == C_SYNC_TARGET || 292 device->state.conn == C_VERIFY_S || 293 device->state.conn == C_VERIFY_T) 294 drbd_syncer_progress(device, seq); 295 296 if (proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) { 297 lc_seq_printf_stats(seq, device->resync); 298 lc_seq_printf_stats(seq, device->act_log); 299 put_ldev(device); 300 } 301 302 if (proc_details >= 2) { 303 if (device->resync) { 304 lc_seq_dump_details(seq, device->resync, "rs_left", 305 resync_dump_detail); 306 } 307 } 308 } 309 rcu_read_unlock(); 310 311 return 0; 312 } 313 314 static int drbd_proc_open(struct inode *inode, struct file *file) 315 { 316 int err; 317 318 if (try_module_get(THIS_MODULE)) { 319 err = single_open(file, drbd_seq_show, PDE_DATA(inode)); 320 if (err) 321 module_put(THIS_MODULE); 322 return err; 323 } 324 return -ENODEV; 325 } 326 327 static int drbd_proc_release(struct inode *inode, struct file *file) 328 { 329 module_put(THIS_MODULE); 330 return single_release(inode, file); 331 } 332 333 /* PROC FS stuff end */ 334