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 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_conf *mdev, 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(mdev, &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 (mdev->state.conn == C_VERIFY_S || mdev->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 (mdev->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(mdev->rs_total >> 10)); 99 else 100 seq_printf(seq, "(%lu/%lu)K\n\t", 101 (unsigned long) Bit2KB(rs_left), 102 (unsigned long) Bit2KB(mdev->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 = (mdev->rs_last_mark + 2) % DRBD_SYNC_MARKS; 118 dt = (jiffies - mdev->rs_mark_time[i]) / HZ; 119 if (dt > (DRBD_SYNC_MARK_STEP * DRBD_SYNC_MARKS)) 120 stalled = 1; 121 122 if (!dt) 123 dt++; 124 db = mdev->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 = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 138 dt = (jiffies - mdev->rs_mark_time[i]) / HZ; 139 if (!dt) 140 dt++; 141 db = mdev->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 - mdev->rs_start - mdev->rs_paused) / HZ; 151 if (dt == 0) 152 dt = 1; 153 db = mdev->rs_total - rs_left; 154 dbdt = Bit2KB(db/dt); 155 seq_printf_with_thousands_grouping(seq, dbdt); 156 seq_printf(seq, ")"); 157 158 if (mdev->state.conn == C_SYNC_TARGET || 159 mdev->state.conn == C_VERIFY_S) { 160 seq_printf(seq, " want: "); 161 seq_printf_with_thousands_grouping(seq, mdev->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(mdev); 169 unsigned long bit_pos; 170 if (mdev->state.conn == C_VERIFY_S || 171 mdev->state.conn == C_VERIFY_T) 172 bit_pos = bm_bits - mdev->ov_left; 173 else 174 bit_pos = mdev->bm_resync_fo; 175 /* Total sectors may be slightly off for oddly 176 * sized devices. So what. */ 177 seq_printf(seq, 178 "\t%3d%% sector pos: %llu/%llu\n", 179 (int)(bit_pos / (bm_bits/100+1)), 180 (unsigned long long)bit_pos * BM_SECT_PER_BIT, 181 (unsigned long long)bm_bits * BM_SECT_PER_BIT); 182 } 183 } 184 185 static void resync_dump_detail(struct seq_file *seq, struct lc_element *e) 186 { 187 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce); 188 189 seq_printf(seq, "%5d %s %s\n", bme->rs_left, 190 bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------", 191 bme->flags & BME_LOCKED ? "LOCKED" : "------" 192 ); 193 } 194 195 static int drbd_seq_show(struct seq_file *seq, void *v) 196 { 197 int i, hole = 0; 198 const char *sn; 199 struct drbd_conf *mdev; 200 201 static char write_ordering_chars[] = { 202 [WO_none] = 'n', 203 [WO_drain_io] = 'd', 204 [WO_bdev_flush] = 'f', 205 }; 206 207 seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n", 208 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag()); 209 210 /* 211 cs .. connection state 212 ro .. node role (local/remote) 213 ds .. disk state (local/remote) 214 protocol 215 various flags 216 ns .. network send 217 nr .. network receive 218 dw .. disk write 219 dr .. disk read 220 al .. activity log write count 221 bm .. bitmap update write count 222 pe .. pending (waiting for ack or data reply) 223 ua .. unack'd (still need to send ack or data reply) 224 ap .. application requests accepted, but not yet completed 225 ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending 226 wo .. write ordering mode currently in use 227 oos .. known out-of-sync kB 228 */ 229 230 for (i = 0; i < minor_count; i++) { 231 mdev = minor_to_mdev(i); 232 if (!mdev) { 233 hole = 1; 234 continue; 235 } 236 if (hole) { 237 hole = 0; 238 seq_printf(seq, "\n"); 239 } 240 241 sn = drbd_conn_str(mdev->state.conn); 242 243 if (mdev->state.conn == C_STANDALONE && 244 mdev->state.disk == D_DISKLESS && 245 mdev->state.role == R_SECONDARY) { 246 seq_printf(seq, "%2d: cs:Unconfigured\n", i); 247 } else { 248 /* reset mdev->congestion_reason */ 249 bdi_rw_congested(&mdev->rq_queue->backing_dev_info); 250 251 seq_printf(seq, 252 "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n" 253 " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u " 254 "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c", 255 i, sn, 256 drbd_role_str(mdev->state.role), 257 drbd_role_str(mdev->state.peer), 258 drbd_disk_str(mdev->state.disk), 259 drbd_disk_str(mdev->state.pdsk), 260 (mdev->net_conf == NULL ? ' ' : 261 (mdev->net_conf->wire_protocol - DRBD_PROT_A+'A')), 262 is_susp(mdev->state) ? 's' : 'r', 263 mdev->state.aftr_isp ? 'a' : '-', 264 mdev->state.peer_isp ? 'p' : '-', 265 mdev->state.user_isp ? 'u' : '-', 266 mdev->congestion_reason ?: '-', 267 test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-', 268 mdev->send_cnt/2, 269 mdev->recv_cnt/2, 270 mdev->writ_cnt/2, 271 mdev->read_cnt/2, 272 mdev->al_writ_cnt, 273 mdev->bm_writ_cnt, 274 atomic_read(&mdev->local_cnt), 275 atomic_read(&mdev->ap_pending_cnt) + 276 atomic_read(&mdev->rs_pending_cnt), 277 atomic_read(&mdev->unacked_cnt), 278 atomic_read(&mdev->ap_bio_cnt), 279 mdev->epochs, 280 write_ordering_chars[mdev->write_ordering] 281 ); 282 seq_printf(seq, " oos:%llu\n", 283 Bit2KB((unsigned long long) 284 drbd_bm_total_weight(mdev))); 285 } 286 if (mdev->state.conn == C_SYNC_SOURCE || 287 mdev->state.conn == C_SYNC_TARGET || 288 mdev->state.conn == C_VERIFY_S || 289 mdev->state.conn == C_VERIFY_T) 290 drbd_syncer_progress(mdev, seq); 291 292 if (proc_details >= 1 && get_ldev_if_state(mdev, D_FAILED)) { 293 lc_seq_printf_stats(seq, mdev->resync); 294 lc_seq_printf_stats(seq, mdev->act_log); 295 put_ldev(mdev); 296 } 297 298 if (proc_details >= 2) { 299 if (mdev->resync) { 300 lc_seq_dump_details(seq, mdev->resync, "rs_left", 301 resync_dump_detail); 302 } 303 } 304 } 305 306 return 0; 307 } 308 309 static int drbd_proc_open(struct inode *inode, struct file *file) 310 { 311 if (try_module_get(THIS_MODULE)) 312 return single_open(file, drbd_seq_show, PDE(inode)->data); 313 return -ENODEV; 314 } 315 316 static int drbd_proc_release(struct inode *inode, struct file *file) 317 { 318 module_put(THIS_MODULE); 319 return single_release(inode, file); 320 } 321 322 /* PROC FS stuff end */ 323