1/* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10#include <linux/sched.h> 11#include <linux/slab.h> 12#include <linux/spinlock.h> 13#include <linux/completion.h> 14#include <linux/buffer_head.h> 15#include <linux/statfs.h> 16#include <linux/seq_file.h> 17#include <linux/mount.h> 18#include <linux/kthread.h> 19#include <linux/delay.h> 20#include <linux/gfs2_ondisk.h> 21#include <linux/crc32.h> 22#include <linux/lm_interface.h> 23 24#include "gfs2.h" 25#include "incore.h" 26#include "glock.h" 27#include "inode.h" 28#include "lm.h" 29#include "log.h" 30#include "mount.h" 31#include "ops_super.h" 32#include "quota.h" 33#include "recovery.h" 34#include "rgrp.h" 35#include "super.h" 36#include "sys.h" 37#include "util.h" 38#include "trans.h" 39#include "dir.h" 40#include "eattr.h" 41#include "bmap.h" 42 43/** 44 * gfs2_write_inode - Make sure the inode is stable on the disk 45 * @inode: The inode 46 * @sync: synchronous write flag 47 * 48 * Returns: errno 49 */ 50 51static int gfs2_write_inode(struct inode *inode, int sync) 52{ 53 struct gfs2_inode *ip = GFS2_I(inode); 54 55 /* Check this is a "normal" inode */ 56 if (inode->i_private) { 57 if (current->flags & PF_MEMALLOC) 58 return 0; 59 if (sync) 60 gfs2_log_flush(GFS2_SB(inode), ip->i_gl); 61 } 62 63 return 0; 64} 65 66/** 67 * gfs2_put_super - Unmount the filesystem 68 * @sb: The VFS superblock 69 * 70 */ 71 72static void gfs2_put_super(struct super_block *sb) 73{ 74 struct gfs2_sbd *sdp = sb->s_fs_info; 75 int error; 76 77 if (!sdp) 78 return; 79 80 if (!strncmp(sb->s_type->name, "gfs2meta", 8)) 81 return; /* Nothing to do */ 82 83 /* Unfreeze the filesystem, if we need to */ 84 85 mutex_lock(&sdp->sd_freeze_lock); 86 if (sdp->sd_freeze_count) 87 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 88 mutex_unlock(&sdp->sd_freeze_lock); 89 90 kthread_stop(sdp->sd_quotad_process); 91 kthread_stop(sdp->sd_logd_process); 92 kthread_stop(sdp->sd_recoverd_process); 93 while (sdp->sd_glockd_num--) 94 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]); 95 kthread_stop(sdp->sd_scand_process); 96 97 if (!(sb->s_flags & MS_RDONLY)) { 98 error = gfs2_make_fs_ro(sdp); 99 if (error) 100 gfs2_io_error(sdp); 101 } 102 /* At this point, we're through modifying the disk */ 103 104 /* Release stuff */ 105 106 iput(sdp->sd_master_dir); 107 iput(sdp->sd_jindex); 108 iput(sdp->sd_inum_inode); 109 iput(sdp->sd_statfs_inode); 110 iput(sdp->sd_rindex); 111 iput(sdp->sd_quota_inode); 112 113 gfs2_glock_put(sdp->sd_rename_gl); 114 gfs2_glock_put(sdp->sd_trans_gl); 115 116 if (!sdp->sd_args.ar_spectator) { 117 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 118 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 119 gfs2_glock_dq_uninit(&sdp->sd_ir_gh); 120 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 121 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 122 iput(sdp->sd_ir_inode); 123 iput(sdp->sd_sc_inode); 124 iput(sdp->sd_qc_inode); 125 } 126 127 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 128 gfs2_clear_rgrpd(sdp); 129 gfs2_jindex_free(sdp); 130 /* Take apart glock structures and buffer lists */ 131 gfs2_gl_hash_clear(sdp, WAIT); 132 /* Unmount the locking protocol */ 133 gfs2_lm_unmount(sdp); 134 135 /* At this point, we're through participating in the lockspace */ 136 gfs2_sys_fs_del(sdp); 137 kfree(sdp); 138} 139 140/** 141 * gfs2_write_super 142 * @sb: the superblock 143 * 144 */ 145 146static void gfs2_write_super(struct super_block *sb) 147{ 148 sb->s_dirt = 0; 149} 150 151/** 152 * gfs2_sync_fs - sync the filesystem 153 * @sb: the superblock 154 * 155 * Flushes the log to disk. 156 */ 157static int gfs2_sync_fs(struct super_block *sb, int wait) 158{ 159 sb->s_dirt = 0; 160 if (wait) 161 gfs2_log_flush(sb->s_fs_info, NULL); 162 return 0; 163} 164 165/** 166 * gfs2_write_super_lockfs - prevent further writes to the filesystem 167 * @sb: the VFS structure for the filesystem 168 * 169 */ 170 171static void gfs2_write_super_lockfs(struct super_block *sb) 172{ 173 struct gfs2_sbd *sdp = sb->s_fs_info; 174 int error; 175 176 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 177 return; 178 179 for (;;) { 180 error = gfs2_freeze_fs(sdp); 181 if (!error) 182 break; 183 184 switch (error) { 185 case -EBUSY: 186 fs_err(sdp, "waiting for recovery before freeze\n"); 187 break; 188 189 default: 190 fs_err(sdp, "error freezing FS: %d\n", error); 191 break; 192 } 193 194 fs_err(sdp, "retrying...\n"); 195 msleep(1000); 196 } 197} 198 199/** 200 * gfs2_unlockfs - reallow writes to the filesystem 201 * @sb: the VFS structure for the filesystem 202 * 203 */ 204 205static void gfs2_unlockfs(struct super_block *sb) 206{ 207 gfs2_unfreeze_fs(sb->s_fs_info); 208} 209 210/** 211 * gfs2_statfs - Gather and return stats about the filesystem 212 * @sb: The superblock 213 * @statfsbuf: The buffer 214 * 215 * Returns: 0 on success or error code 216 */ 217 218static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 219{ 220 struct super_block *sb = dentry->d_inode->i_sb; 221 struct gfs2_sbd *sdp = sb->s_fs_info; 222 struct gfs2_statfs_change_host sc; 223 int error; 224 225 if (gfs2_tune_get(sdp, gt_statfs_slow)) 226 error = gfs2_statfs_slow(sdp, &sc); 227 else 228 error = gfs2_statfs_i(sdp, &sc); 229 230 if (error) 231 return error; 232 233 buf->f_type = GFS2_MAGIC; 234 buf->f_bsize = sdp->sd_sb.sb_bsize; 235 buf->f_blocks = sc.sc_total; 236 buf->f_bfree = sc.sc_free; 237 buf->f_bavail = sc.sc_free; 238 buf->f_files = sc.sc_dinodes + sc.sc_free; 239 buf->f_ffree = sc.sc_free; 240 buf->f_namelen = GFS2_FNAMESIZE; 241 242 return 0; 243} 244 245/** 246 * gfs2_remount_fs - called when the FS is remounted 247 * @sb: the filesystem 248 * @flags: the remount flags 249 * @data: extra data passed in (not used right now) 250 * 251 * Returns: errno 252 */ 253 254static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 255{ 256 struct gfs2_sbd *sdp = sb->s_fs_info; 257 int error; 258 259 error = gfs2_mount_args(sdp, data, 1); 260 if (error) 261 return error; 262 263 if (sdp->sd_args.ar_spectator) 264 *flags |= MS_RDONLY; 265 else { 266 if (*flags & MS_RDONLY) { 267 if (!(sb->s_flags & MS_RDONLY)) 268 error = gfs2_make_fs_ro(sdp); 269 } else if (!(*flags & MS_RDONLY) && 270 (sb->s_flags & MS_RDONLY)) { 271 error = gfs2_make_fs_rw(sdp); 272 } 273 } 274 275 if (*flags & (MS_NOATIME | MS_NODIRATIME)) 276 set_bit(SDF_NOATIME, &sdp->sd_flags); 277 else 278 clear_bit(SDF_NOATIME, &sdp->sd_flags); 279 280 /* Don't let the VFS update atimes. GFS2 handles this itself. */ 281 *flags |= MS_NOATIME | MS_NODIRATIME; 282 283 return error; 284} 285 286/** 287 * gfs2_drop_inode - Drop an inode (test for remote unlink) 288 * @inode: The inode to drop 289 * 290 * If we've received a callback on an iopen lock then its because a 291 * remote node tried to deallocate the inode but failed due to this node 292 * still having the inode open. Here we mark the link count zero 293 * since we know that it must have reached zero if the GLF_DEMOTE flag 294 * is set on the iopen glock. If we didn't do a disk read since the 295 * remote node removed the final link then we might otherwise miss 296 * this event. This check ensures that this node will deallocate the 297 * inode's blocks, or alternatively pass the baton on to another 298 * node for later deallocation. 299 */ 300static void gfs2_drop_inode(struct inode *inode) 301{ 302 if (inode->i_private && inode->i_nlink) { 303 struct gfs2_inode *ip = GFS2_I(inode); 304 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 305 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) 306 clear_nlink(inode); 307 } 308 generic_drop_inode(inode); 309} 310 311/** 312 * gfs2_clear_inode - Deallocate an inode when VFS is done with it 313 * @inode: The VFS inode 314 * 315 */ 316 317static void gfs2_clear_inode(struct inode *inode) 318{ 319 /* This tells us its a "real" inode and not one which only 320 * serves to contain an address space (see rgrp.c, meta_io.c) 321 * which therefore doesn't have its own glocks. 322 */ 323 if (inode->i_private) { 324 struct gfs2_inode *ip = GFS2_I(inode); 325 ip->i_gl->gl_object = NULL; 326 gfs2_glock_schedule_for_reclaim(ip->i_gl); 327 gfs2_glock_put(ip->i_gl); 328 ip->i_gl = NULL; 329 if (ip->i_iopen_gh.gh_gl) 330 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 331 } 332} 333 334/** 335 * gfs2_show_options - Show mount options for /proc/mounts 336 * @s: seq_file structure 337 * @mnt: vfsmount 338 * 339 * Returns: 0 on success or error code 340 */ 341 342static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt) 343{ 344 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info; 345 struct gfs2_args *args = &sdp->sd_args; 346 347 if (args->ar_lockproto[0]) 348 seq_printf(s, ",lockproto=%s", args->ar_lockproto); 349 if (args->ar_locktable[0]) 350 seq_printf(s, ",locktable=%s", args->ar_locktable); 351 if (args->ar_hostdata[0]) 352 seq_printf(s, ",hostdata=%s", args->ar_hostdata); 353 if (args->ar_spectator) 354 seq_printf(s, ",spectator"); 355 if (args->ar_ignore_local_fs) 356 seq_printf(s, ",ignore_local_fs"); 357 if (args->ar_localflocks) 358 seq_printf(s, ",localflocks"); 359 if (args->ar_localcaching) 360 seq_printf(s, ",localcaching"); 361 if (args->ar_debug) 362 seq_printf(s, ",debug"); 363 if (args->ar_upgrade) 364 seq_printf(s, ",upgrade"); 365 if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT) 366 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd); 367 if (args->ar_posix_acl) 368 seq_printf(s, ",acl"); 369 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 370 char *state; 371 switch (args->ar_quota) { 372 case GFS2_QUOTA_OFF: 373 state = "off"; 374 break; 375 case GFS2_QUOTA_ACCOUNT: 376 state = "account"; 377 break; 378 case GFS2_QUOTA_ON: 379 state = "on"; 380 break; 381 default: 382 state = "unknown"; 383 break; 384 } 385 seq_printf(s, ",quota=%s", state); 386 } 387 if (args->ar_suiddir) 388 seq_printf(s, ",suiddir"); 389 if (args->ar_data != GFS2_DATA_DEFAULT) { 390 char *state; 391 switch (args->ar_data) { 392 case GFS2_DATA_WRITEBACK: 393 state = "writeback"; 394 break; 395 case GFS2_DATA_ORDERED: 396 state = "ordered"; 397 break; 398 default: 399 state = "unknown"; 400 break; 401 } 402 seq_printf(s, ",data=%s", state); 403 } 404 405 return 0; 406} 407 408/* 409 * We have to (at the moment) hold the inodes main lock to cover 410 * the gap between unlocking the shared lock on the iopen lock and 411 * taking the exclusive lock. I'd rather do a shared -> exclusive 412 * conversion on the iopen lock, but we can change that later. This 413 * is safe, just less efficient. 414 */ 415static void gfs2_delete_inode(struct inode *inode) 416{ 417 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 418 struct gfs2_inode *ip = GFS2_I(inode); 419 struct gfs2_holder gh; 420 int error; 421 422 if (!inode->i_private) 423 goto out; 424 425 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &gh); 426 if (unlikely(error)) { 427 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 428 goto out; 429 } 430 431 gfs2_glock_dq(&ip->i_iopen_gh); 432 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); 433 error = gfs2_glock_nq(&ip->i_iopen_gh); 434 if (error) 435 goto out_uninit; 436 437 if (S_ISDIR(inode->i_mode) && 438 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) { 439 error = gfs2_dir_exhash_dealloc(ip); 440 if (error) 441 goto out_unlock; 442 } 443 444 if (ip->i_di.di_eattr) { 445 error = gfs2_ea_dealloc(ip); 446 if (error) 447 goto out_unlock; 448 } 449 450 if (!gfs2_is_stuffed(ip)) { 451 error = gfs2_file_dealloc(ip); 452 if (error) 453 goto out_unlock; 454 } 455 456 error = gfs2_dinode_dealloc(ip); 457 /* 458 * Must do this before unlock to avoid trying to write back 459 * potentially dirty data now that inode no longer exists 460 * on disk. 461 */ 462 truncate_inode_pages(&inode->i_data, 0); 463 464out_unlock: 465 gfs2_glock_dq(&ip->i_iopen_gh); 466out_uninit: 467 gfs2_holder_uninit(&ip->i_iopen_gh); 468 gfs2_glock_dq_uninit(&gh); 469 if (error && error != GLR_TRYFAILED) 470 fs_warn(sdp, "gfs2_delete_inode: %d\n", error); 471out: 472 truncate_inode_pages(&inode->i_data, 0); 473 clear_inode(inode); 474} 475 476 477 478static struct inode *gfs2_alloc_inode(struct super_block *sb) 479{ 480 struct gfs2_inode *ip; 481 482 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 483 if (ip) { 484 ip->i_flags = 0; 485 ip->i_gl = NULL; 486 ip->i_last_pfault = jiffies; 487 } 488 return &ip->i_inode; 489} 490 491static void gfs2_destroy_inode(struct inode *inode) 492{ 493 kmem_cache_free(gfs2_inode_cachep, inode); 494} 495 496const struct super_operations gfs2_super_ops = { 497 .alloc_inode = gfs2_alloc_inode, 498 .destroy_inode = gfs2_destroy_inode, 499 .write_inode = gfs2_write_inode, 500 .delete_inode = gfs2_delete_inode, 501 .put_super = gfs2_put_super, 502 .write_super = gfs2_write_super, 503 .sync_fs = gfs2_sync_fs, 504 .write_super_lockfs = gfs2_write_super_lockfs, 505 .unlockfs = gfs2_unlockfs, 506 .statfs = gfs2_statfs, 507 .remount_fs = gfs2_remount_fs, 508 .clear_inode = gfs2_clear_inode, 509 .drop_inode = gfs2_drop_inode, 510 .show_options = gfs2_show_options, 511}; 512