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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.4 * All Rights Reserved.5 */6#include "xfs.h"7#include "xfs_fs.h"8#include "xfs_shared.h"9#include "xfs_format.h"10#include "xfs_log_format.h"11#include "xfs_trans_resv.h"12#include "xfs_sb.h"13#include "xfs_mount.h"14#include "xfs_trans.h"15#include "xfs_error.h"16#include "xfs_alloc.h"17#include "xfs_fsops.h"18#include "xfs_trans_space.h"19#include "xfs_log.h"20#include "xfs_log_priv.h"21#include "xfs_ag.h"22#include "xfs_ag_resv.h"23#include "xfs_trace.h"24 25/*26 * Write new AG headers to disk. Non-transactional, but need to be27 * written and completed prior to the growfs transaction being logged.28 * To do this, we use a delayed write buffer list and wait for29 * submission and IO completion of the list as a whole. This allows the30 * IO subsystem to merge all the AG headers in a single AG into a single31 * IO and hide most of the latency of the IO from us.32 *33 * This also means that if we get an error whilst building the buffer34 * list to write, we can cancel the entire list without having written35 * anything.36 */37static int38xfs_resizefs_init_new_ags(39 struct xfs_trans *tp,40 struct aghdr_init_data *id,41 xfs_agnumber_t oagcount,42 xfs_agnumber_t nagcount,43 xfs_rfsblock_t delta,44 struct xfs_perag *last_pag,45 bool *lastag_extended)46{47 struct xfs_mount *mp = tp->t_mountp;48 xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta;49 int error;50 51 *lastag_extended = false;52 53 INIT_LIST_HEAD(&id->buffer_list);54 for (id->agno = nagcount - 1;55 id->agno >= oagcount;56 id->agno--, delta -= id->agsize) {57 58 if (id->agno == nagcount - 1)59 id->agsize = nb - (id->agno *60 (xfs_rfsblock_t)mp->m_sb.sb_agblocks);61 else62 id->agsize = mp->m_sb.sb_agblocks;63 64 error = xfs_ag_init_headers(mp, id);65 if (error) {66 xfs_buf_delwri_cancel(&id->buffer_list);67 return error;68 }69 }70 71 error = xfs_buf_delwri_submit(&id->buffer_list);72 if (error)73 return error;74 75 if (delta) {76 *lastag_extended = true;77 error = xfs_ag_extend_space(last_pag, tp, delta);78 }79 return error;80}81 82/*83 * growfs operations84 */85static int86xfs_growfs_data_private(87 struct xfs_mount *mp, /* mount point for filesystem */88 struct xfs_growfs_data *in) /* growfs data input struct */89{90 xfs_agnumber_t oagcount = mp->m_sb.sb_agcount;91 struct xfs_buf *bp;92 int error;93 xfs_agnumber_t nagcount;94 xfs_agnumber_t nagimax = 0;95 xfs_rfsblock_t nb, nb_div, nb_mod;96 int64_t delta;97 bool lastag_extended = false;98 struct xfs_trans *tp;99 struct aghdr_init_data id = {};100 struct xfs_perag *last_pag;101 102 nb = in->newblocks;103 error = xfs_sb_validate_fsb_count(&mp->m_sb, nb);104 if (error)105 return error;106 107 if (nb > mp->m_sb.sb_dblocks) {108 error = xfs_buf_read_uncached(mp->m_ddev_targp,109 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),110 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);111 if (error)112 return error;113 xfs_buf_relse(bp);114 }115 116 nb_div = nb;117 nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);118 if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS)119 nb_div++;120 else if (nb_mod)121 nb = nb_div * mp->m_sb.sb_agblocks;122 123 if (nb_div > XFS_MAX_AGNUMBER + 1) {124 nb_div = XFS_MAX_AGNUMBER + 1;125 nb = nb_div * mp->m_sb.sb_agblocks;126 }127 nagcount = nb_div;128 delta = nb - mp->m_sb.sb_dblocks;129 /*130 * Reject filesystems with a single AG because they are not131 * supported, and reject a shrink operation that would cause a132 * filesystem to become unsupported.133 */134 if (delta < 0 && nagcount < 2)135 return -EINVAL;136 137 /* No work to do */138 if (delta == 0)139 return 0;140 141 /* TODO: shrinking the entire AGs hasn't yet completed */142 if (nagcount < oagcount)143 return -EINVAL;144 145 /* allocate the new per-ag structures */146 error = xfs_initialize_perag(mp, oagcount, nagcount, nb, &nagimax);147 if (error)148 return error;149 150 if (delta > 0)151 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,152 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,153 &tp);154 else155 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, -delta, 0,156 0, &tp);157 if (error)158 goto out_free_unused_perag;159 160 last_pag = xfs_perag_get(mp, oagcount - 1);161 if (delta > 0) {162 error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount,163 delta, last_pag, &lastag_extended);164 } else {165 xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SHRINK,166 "EXPERIMENTAL online shrink feature in use. Use at your own risk!");167 168 error = xfs_ag_shrink_space(last_pag, &tp, -delta);169 }170 xfs_perag_put(last_pag);171 if (error)172 goto out_trans_cancel;173 174 /*175 * Update changed superblock fields transactionally. These are not176 * seen by the rest of the world until the transaction commit applies177 * them atomically to the superblock.178 */179 if (nagcount > oagcount)180 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);181 if (delta)182 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta);183 if (id.nfree)184 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);185 186 /*187 * Sync sb counters now to reflect the updated values. This is188 * particularly important for shrink because the write verifier189 * will fail if sb_fdblocks is ever larger than sb_dblocks.190 */191 if (xfs_has_lazysbcount(mp))192 xfs_log_sb(tp);193 194 xfs_trans_set_sync(tp);195 error = xfs_trans_commit(tp);196 if (error)197 return error;198 199 /* New allocation groups fully initialized, so update mount struct */200 if (nagimax)201 mp->m_maxagi = nagimax;202 xfs_set_low_space_thresholds(mp);203 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);204 205 if (delta > 0) {206 /*207 * If we expanded the last AG, free the per-AG reservation208 * so we can reinitialize it with the new size.209 */210 if (lastag_extended) {211 struct xfs_perag *pag;212 213 pag = xfs_perag_get(mp, id.agno);214 xfs_ag_resv_free(pag);215 xfs_perag_put(pag);216 }217 /*218 * Reserve AG metadata blocks. ENOSPC here does not mean there219 * was a growfs failure, just that there still isn't space for220 * new user data after the grow has been run.221 */222 error = xfs_fs_reserve_ag_blocks(mp);223 if (error == -ENOSPC)224 error = 0;225 }226 return error;227 228out_trans_cancel:229 xfs_trans_cancel(tp);230out_free_unused_perag:231 if (nagcount > oagcount)232 xfs_free_perag_range(mp, oagcount, nagcount);233 return error;234}235 236static int237xfs_growfs_log_private(238 struct xfs_mount *mp, /* mount point for filesystem */239 struct xfs_growfs_log *in) /* growfs log input struct */240{241 xfs_extlen_t nb;242 243 nb = in->newblocks;244 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))245 return -EINVAL;246 if (nb == mp->m_sb.sb_logblocks &&247 in->isint == (mp->m_sb.sb_logstart != 0))248 return -EINVAL;249 /*250 * Moving the log is hard, need new interfaces to sync251 * the log first, hold off all activity while moving it.252 * Can have shorter or longer log in the same space,253 * or transform internal to external log or vice versa.254 */255 return -ENOSYS;256}257 258static int259xfs_growfs_imaxpct(260 struct xfs_mount *mp,261 __u32 imaxpct)262{263 struct xfs_trans *tp;264 int dpct;265 int error;266 267 if (imaxpct > 100)268 return -EINVAL;269 270 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,271 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);272 if (error)273 return error;274 275 dpct = imaxpct - mp->m_sb.sb_imax_pct;276 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);277 xfs_trans_set_sync(tp);278 return xfs_trans_commit(tp);279}280 281/*282 * protected versions of growfs function acquire and release locks on the mount283 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,284 * XFS_IOC_FSGROWFSRT285 */286int287xfs_growfs_data(288 struct xfs_mount *mp,289 struct xfs_growfs_data *in)290{291 int error = 0;292 293 if (!capable(CAP_SYS_ADMIN))294 return -EPERM;295 if (!mutex_trylock(&mp->m_growlock))296 return -EWOULDBLOCK;297 298 /* update imaxpct separately to the physical grow of the filesystem */299 if (in->imaxpct != mp->m_sb.sb_imax_pct) {300 error = xfs_growfs_imaxpct(mp, in->imaxpct);301 if (error)302 goto out_error;303 }304 305 if (in->newblocks != mp->m_sb.sb_dblocks) {306 error = xfs_growfs_data_private(mp, in);307 if (error)308 goto out_error;309 }310 311 /* Post growfs calculations needed to reflect new state in operations */312 if (mp->m_sb.sb_imax_pct) {313 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;314 do_div(icount, 100);315 M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);316 } else317 M_IGEO(mp)->maxicount = 0;318 319 /* Update secondary superblocks now the physical grow has completed */320 error = xfs_update_secondary_sbs(mp);321 322out_error:323 /*324 * Increment the generation unconditionally, the error could be from325 * updating the secondary superblocks, in which case the new size326 * is live already.327 */328 mp->m_generation++;329 mutex_unlock(&mp->m_growlock);330 return error;331}332 333int334xfs_growfs_log(335 xfs_mount_t *mp,336 struct xfs_growfs_log *in)337{338 int error;339 340 if (!capable(CAP_SYS_ADMIN))341 return -EPERM;342 if (!mutex_trylock(&mp->m_growlock))343 return -EWOULDBLOCK;344 error = xfs_growfs_log_private(mp, in);345 mutex_unlock(&mp->m_growlock);346 return error;347}348 349/*350 * Reserve the requested number of blocks if available. Otherwise return351 * as many as possible to satisfy the request. The actual number352 * reserved are returned in outval.353 */354int355xfs_reserve_blocks(356 struct xfs_mount *mp,357 uint64_t request)358{359 int64_t lcounter, delta;360 int64_t fdblks_delta = 0;361 int64_t free;362 int error = 0;363 364 /*365 * With per-cpu counters, this becomes an interesting problem. we need366 * to work out if we are freeing or allocation blocks first, then we can367 * do the modification as necessary.368 *369 * We do this under the m_sb_lock so that if we are near ENOSPC, we will370 * hold out any changes while we work out what to do. This means that371 * the amount of free space can change while we do this, so we need to372 * retry if we end up trying to reserve more space than is available.373 */374 spin_lock(&mp->m_sb_lock);375 376 /*377 * If our previous reservation was larger than the current value,378 * then move any unused blocks back to the free pool. Modify the resblks379 * counters directly since we shouldn't have any problems unreserving380 * space.381 */382 if (mp->m_resblks > request) {383 lcounter = mp->m_resblks_avail - request;384 if (lcounter > 0) { /* release unused blocks */385 fdblks_delta = lcounter;386 mp->m_resblks_avail -= lcounter;387 }388 mp->m_resblks = request;389 if (fdblks_delta) {390 spin_unlock(&mp->m_sb_lock);391 xfs_add_fdblocks(mp, fdblks_delta);392 spin_lock(&mp->m_sb_lock);393 }394 395 goto out;396 }397 398 /*399 * If the request is larger than the current reservation, reserve the400 * blocks before we update the reserve counters. Sample m_fdblocks and401 * perform a partial reservation if the request exceeds free space.402 *403 * The code below estimates how many blocks it can request from404 * fdblocks to stash in the reserve pool. This is a classic TOCTOU405 * race since fdblocks updates are not always coordinated via406 * m_sb_lock. Set the reserve size even if there's not enough free407 * space to fill it because mod_fdblocks will refill an undersized408 * reserve when it can.409 */410 free = percpu_counter_sum(&mp->m_fdblocks) -411 xfs_fdblocks_unavailable(mp);412 delta = request - mp->m_resblks;413 mp->m_resblks = request;414 if (delta > 0 && free > 0) {415 /*416 * We'll either succeed in getting space from the free block417 * count or we'll get an ENOSPC. Don't set the reserved flag418 * here - we don't want to reserve the extra reserve blocks419 * from the reserve.420 *421 * The desired reserve size can change after we drop the lock.422 * Use mod_fdblocks to put the space into the reserve or into423 * fdblocks as appropriate.424 */425 fdblks_delta = min(free, delta);426 spin_unlock(&mp->m_sb_lock);427 error = xfs_dec_fdblocks(mp, fdblks_delta, 0);428 if (!error)429 xfs_add_fdblocks(mp, fdblks_delta);430 spin_lock(&mp->m_sb_lock);431 }432out:433 spin_unlock(&mp->m_sb_lock);434 return error;435}436 437int438xfs_fs_goingdown(439 xfs_mount_t *mp,440 uint32_t inflags)441{442 switch (inflags) {443 case XFS_FSOP_GOING_FLAGS_DEFAULT: {444 if (!bdev_freeze(mp->m_super->s_bdev)) {445 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);446 bdev_thaw(mp->m_super->s_bdev);447 }448 break;449 }450 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:451 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);452 break;453 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:454 xfs_force_shutdown(mp,455 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);456 break;457 default:458 return -EINVAL;459 }460 461 return 0;462}463 464/*465 * Force a shutdown of the filesystem instantly while keeping the filesystem466 * consistent. We don't do an unmount here; just shutdown the shop, make sure467 * that absolutely nothing persistent happens to this filesystem after this468 * point.469 *470 * The shutdown state change is atomic, resulting in the first and only the471 * first shutdown call processing the shutdown. This means we only shutdown the472 * log once as it requires, and we don't spam the logs when multiple concurrent473 * shutdowns race to set the shutdown flags.474 */475void476xfs_do_force_shutdown(477 struct xfs_mount *mp,478 uint32_t flags,479 char *fname,480 int lnnum)481{482 int tag;483 const char *why;484 485 486 if (xfs_set_shutdown(mp)) {487 xlog_shutdown_wait(mp->m_log);488 return;489 }490 if (mp->m_sb_bp)491 mp->m_sb_bp->b_flags |= XBF_DONE;492 493 if (flags & SHUTDOWN_FORCE_UMOUNT)494 xfs_alert(mp, "User initiated shutdown received.");495 496 if (xlog_force_shutdown(mp->m_log, flags)) {497 tag = XFS_PTAG_SHUTDOWN_LOGERROR;498 why = "Log I/O Error";499 } else if (flags & SHUTDOWN_CORRUPT_INCORE) {500 tag = XFS_PTAG_SHUTDOWN_CORRUPT;501 why = "Corruption of in-memory data";502 } else if (flags & SHUTDOWN_CORRUPT_ONDISK) {503 tag = XFS_PTAG_SHUTDOWN_CORRUPT;504 why = "Corruption of on-disk metadata";505 } else if (flags & SHUTDOWN_DEVICE_REMOVED) {506 tag = XFS_PTAG_SHUTDOWN_IOERROR;507 why = "Block device removal";508 } else {509 tag = XFS_PTAG_SHUTDOWN_IOERROR;510 why = "Metadata I/O Error";511 }512 513 trace_xfs_force_shutdown(mp, tag, flags, fname, lnnum);514 515 xfs_alert_tag(mp, tag,516"%s (0x%x) detected at %pS (%s:%d). Shutting down filesystem.",517 why, flags, __return_address, fname, lnnum);518 xfs_alert(mp,519 "Please unmount the filesystem and rectify the problem(s)");520 if (xfs_error_level >= XFS_ERRLEVEL_HIGH)521 xfs_stack_trace();522}523 524/*525 * Reserve free space for per-AG metadata.526 */527int528xfs_fs_reserve_ag_blocks(529 struct xfs_mount *mp)530{531 xfs_agnumber_t agno;532 struct xfs_perag *pag;533 int error = 0;534 int err2;535 536 mp->m_finobt_nores = false;537 for_each_perag(mp, agno, pag) {538 err2 = xfs_ag_resv_init(pag, NULL);539 if (err2 && !error)540 error = err2;541 }542 543 if (error && error != -ENOSPC) {544 xfs_warn(mp,545 "Error %d reserving per-AG metadata reserve pool.", error);546 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);547 }548 549 return error;550}551 552/*553 * Free space reserved for per-AG metadata.554 */555void556xfs_fs_unreserve_ag_blocks(557 struct xfs_mount *mp)558{559 xfs_agnumber_t agno;560 struct xfs_perag *pag;561 562 for_each_perag(mp, agno, pag)563 xfs_ag_resv_free(pag);564}565