| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_sb.h" |
| #include "xfs_mount.h" |
| #include "xfs_defer.h" |
| #include "xfs_trans.h" |
| #include "xfs_error.h" |
| #include "xfs_btree.h" |
| #include "xfs_alloc.h" |
| #include "xfs_fsops.h" |
| #include "xfs_trans_space.h" |
| #include "xfs_rtalloc.h" |
| #include "xfs_trace.h" |
| #include "xfs_log.h" |
| #include "xfs_ag.h" |
| #include "xfs_ag_resv.h" |
| |
| /* |
| * growfs operations |
| */ |
| static int |
| xfs_growfs_data_private( |
| xfs_mount_t *mp, /* mount point for filesystem */ |
| xfs_growfs_data_t *in) /* growfs data input struct */ |
| { |
| xfs_buf_t *bp; |
| int error; |
| xfs_agnumber_t nagcount; |
| xfs_agnumber_t nagimax = 0; |
| xfs_rfsblock_t nb, nb_mod; |
| xfs_rfsblock_t new; |
| xfs_agnumber_t oagcount; |
| xfs_trans_t *tp; |
| LIST_HEAD (buffer_list); |
| struct aghdr_init_data id = {}; |
| |
| nb = in->newblocks; |
| if (nb < mp->m_sb.sb_dblocks) |
| return -EINVAL; |
| if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) |
| return error; |
| error = xfs_buf_read_uncached(mp->m_ddev_targp, |
| XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), |
| XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
| if (error) |
| return error; |
| xfs_buf_relse(bp); |
| |
| new = nb; /* use new as a temporary here */ |
| nb_mod = do_div(new, mp->m_sb.sb_agblocks); |
| nagcount = new + (nb_mod != 0); |
| if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { |
| nagcount--; |
| nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; |
| if (nb < mp->m_sb.sb_dblocks) |
| return -EINVAL; |
| } |
| new = nb - mp->m_sb.sb_dblocks; |
| oagcount = mp->m_sb.sb_agcount; |
| |
| /* allocate the new per-ag structures */ |
| if (nagcount > oagcount) { |
| error = xfs_initialize_perag(mp, nagcount, &nagimax); |
| if (error) |
| return error; |
| } |
| |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
| XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); |
| if (error) |
| return error; |
| |
| /* |
| * Write new AG headers to disk. Non-transactional, but need to be |
| * written and completed prior to the growfs transaction being logged. |
| * To do this, we use a delayed write buffer list and wait for |
| * submission and IO completion of the list as a whole. This allows the |
| * IO subsystem to merge all the AG headers in a single AG into a single |
| * IO and hide most of the latency of the IO from us. |
| * |
| * This also means that if we get an error whilst building the buffer |
| * list to write, we can cancel the entire list without having written |
| * anything. |
| */ |
| INIT_LIST_HEAD(&id.buffer_list); |
| for (id.agno = nagcount - 1; |
| id.agno >= oagcount; |
| id.agno--, new -= id.agsize) { |
| |
| if (id.agno == nagcount - 1) |
| id.agsize = nb - |
| (id.agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); |
| else |
| id.agsize = mp->m_sb.sb_agblocks; |
| |
| error = xfs_ag_init_headers(mp, &id); |
| if (error) { |
| xfs_buf_delwri_cancel(&id.buffer_list); |
| goto out_trans_cancel; |
| } |
| } |
| error = xfs_buf_delwri_submit(&id.buffer_list); |
| if (error) |
| goto out_trans_cancel; |
| |
| xfs_trans_agblocks_delta(tp, id.nfree); |
| |
| /* If there are new blocks in the old last AG, extend it. */ |
| if (new) { |
| error = xfs_ag_extend_space(mp, tp, &id, new); |
| if (error) |
| goto out_trans_cancel; |
| } |
| |
| /* |
| * Update changed superblock fields transactionally. These are not |
| * seen by the rest of the world until the transaction commit applies |
| * them atomically to the superblock. |
| */ |
| if (nagcount > oagcount) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); |
| if (nb > mp->m_sb.sb_dblocks) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, |
| nb - mp->m_sb.sb_dblocks); |
| if (id.nfree) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree); |
| xfs_trans_set_sync(tp); |
| error = xfs_trans_commit(tp); |
| if (error) |
| return error; |
| |
| /* New allocation groups fully initialized, so update mount struct */ |
| if (nagimax) |
| mp->m_maxagi = nagimax; |
| xfs_set_low_space_thresholds(mp); |
| mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); |
| |
| /* |
| * If we expanded the last AG, free the per-AG reservation |
| * so we can reinitialize it with the new size. |
| */ |
| if (new) { |
| struct xfs_perag *pag; |
| |
| pag = xfs_perag_get(mp, id.agno); |
| error = xfs_ag_resv_free(pag); |
| xfs_perag_put(pag); |
| if (error) |
| return error; |
| } |
| |
| /* |
| * Reserve AG metadata blocks. ENOSPC here does not mean there was a |
| * growfs failure, just that there still isn't space for new user data |
| * after the grow has been run. |
| */ |
| error = xfs_fs_reserve_ag_blocks(mp); |
| if (error == -ENOSPC) |
| error = 0; |
| return error; |
| |
| out_trans_cancel: |
| xfs_trans_cancel(tp); |
| return error; |
| } |
| |
| static int |
| xfs_growfs_log_private( |
| xfs_mount_t *mp, /* mount point for filesystem */ |
| xfs_growfs_log_t *in) /* growfs log input struct */ |
| { |
| xfs_extlen_t nb; |
| |
| nb = in->newblocks; |
| if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) |
| return -EINVAL; |
| if (nb == mp->m_sb.sb_logblocks && |
| in->isint == (mp->m_sb.sb_logstart != 0)) |
| return -EINVAL; |
| /* |
| * Moving the log is hard, need new interfaces to sync |
| * the log first, hold off all activity while moving it. |
| * Can have shorter or longer log in the same space, |
| * or transform internal to external log or vice versa. |
| */ |
| return -ENOSYS; |
| } |
| |
| static int |
| xfs_growfs_imaxpct( |
| struct xfs_mount *mp, |
| __u32 imaxpct) |
| { |
| struct xfs_trans *tp; |
| int dpct; |
| int error; |
| |
| if (imaxpct > 100) |
| return -EINVAL; |
| |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
| XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); |
| if (error) |
| return error; |
| |
| dpct = imaxpct - mp->m_sb.sb_imax_pct; |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); |
| xfs_trans_set_sync(tp); |
| return xfs_trans_commit(tp); |
| } |
| |
| /* |
| * protected versions of growfs function acquire and release locks on the mount |
| * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, |
| * XFS_IOC_FSGROWFSRT |
| */ |
| int |
| xfs_growfs_data( |
| struct xfs_mount *mp, |
| struct xfs_growfs_data *in) |
| { |
| int error = 0; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!mutex_trylock(&mp->m_growlock)) |
| return -EWOULDBLOCK; |
| |
| /* update imaxpct separately to the physical grow of the filesystem */ |
| if (in->imaxpct != mp->m_sb.sb_imax_pct) { |
| error = xfs_growfs_imaxpct(mp, in->imaxpct); |
| if (error) |
| goto out_error; |
| } |
| |
| if (in->newblocks != mp->m_sb.sb_dblocks) { |
| error = xfs_growfs_data_private(mp, in); |
| if (error) |
| goto out_error; |
| } |
| |
| /* Post growfs calculations needed to reflect new state in operations */ |
| if (mp->m_sb.sb_imax_pct) { |
| uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; |
| do_div(icount, 100); |
| mp->m_maxicount = icount << mp->m_sb.sb_inopblog; |
| } else |
| mp->m_maxicount = 0; |
| |
| /* Update secondary superblocks now the physical grow has completed */ |
| error = xfs_update_secondary_sbs(mp); |
| |
| out_error: |
| /* |
| * Increment the generation unconditionally, the error could be from |
| * updating the secondary superblocks, in which case the new size |
| * is live already. |
| */ |
| mp->m_generation++; |
| mutex_unlock(&mp->m_growlock); |
| return error; |
| } |
| |
| int |
| xfs_growfs_log( |
| xfs_mount_t *mp, |
| xfs_growfs_log_t *in) |
| { |
| int error; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!mutex_trylock(&mp->m_growlock)) |
| return -EWOULDBLOCK; |
| error = xfs_growfs_log_private(mp, in); |
| mutex_unlock(&mp->m_growlock); |
| return error; |
| } |
| |
| /* |
| * exported through ioctl XFS_IOC_FSCOUNTS |
| */ |
| |
| int |
| xfs_fs_counts( |
| xfs_mount_t *mp, |
| xfs_fsop_counts_t *cnt) |
| { |
| cnt->allocino = percpu_counter_read_positive(&mp->m_icount); |
| cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); |
| cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - |
| mp->m_alloc_set_aside; |
| |
| spin_lock(&mp->m_sb_lock); |
| cnt->freertx = mp->m_sb.sb_frextents; |
| spin_unlock(&mp->m_sb_lock); |
| return 0; |
| } |
| |
| /* |
| * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS |
| * |
| * xfs_reserve_blocks is called to set m_resblks |
| * in the in-core mount table. The number of unused reserved blocks |
| * is kept in m_resblks_avail. |
| * |
| * Reserve the requested number of blocks if available. Otherwise return |
| * as many as possible to satisfy the request. The actual number |
| * reserved are returned in outval |
| * |
| * A null inval pointer indicates that only the current reserved blocks |
| * available should be returned no settings are changed. |
| */ |
| |
| int |
| xfs_reserve_blocks( |
| xfs_mount_t *mp, |
| uint64_t *inval, |
| xfs_fsop_resblks_t *outval) |
| { |
| int64_t lcounter, delta; |
| int64_t fdblks_delta = 0; |
| uint64_t request; |
| int64_t free; |
| int error = 0; |
| |
| /* If inval is null, report current values and return */ |
| if (inval == (uint64_t *)NULL) { |
| if (!outval) |
| return -EINVAL; |
| outval->resblks = mp->m_resblks; |
| outval->resblks_avail = mp->m_resblks_avail; |
| return 0; |
| } |
| |
| request = *inval; |
| |
| /* |
| * With per-cpu counters, this becomes an interesting problem. we need |
| * to work out if we are freeing or allocation blocks first, then we can |
| * do the modification as necessary. |
| * |
| * We do this under the m_sb_lock so that if we are near ENOSPC, we will |
| * hold out any changes while we work out what to do. This means that |
| * the amount of free space can change while we do this, so we need to |
| * retry if we end up trying to reserve more space than is available. |
| */ |
| spin_lock(&mp->m_sb_lock); |
| |
| /* |
| * If our previous reservation was larger than the current value, |
| * then move any unused blocks back to the free pool. Modify the resblks |
| * counters directly since we shouldn't have any problems unreserving |
| * space. |
| */ |
| if (mp->m_resblks > request) { |
| lcounter = mp->m_resblks_avail - request; |
| if (lcounter > 0) { /* release unused blocks */ |
| fdblks_delta = lcounter; |
| mp->m_resblks_avail -= lcounter; |
| } |
| mp->m_resblks = request; |
| if (fdblks_delta) { |
| spin_unlock(&mp->m_sb_lock); |
| error = xfs_mod_fdblocks(mp, fdblks_delta, 0); |
| spin_lock(&mp->m_sb_lock); |
| } |
| |
| goto out; |
| } |
| |
| /* |
| * If the request is larger than the current reservation, reserve the |
| * blocks before we update the reserve counters. Sample m_fdblocks and |
| * perform a partial reservation if the request exceeds free space. |
| */ |
| error = -ENOSPC; |
| do { |
| free = percpu_counter_sum(&mp->m_fdblocks) - |
| mp->m_alloc_set_aside; |
| if (free <= 0) |
| break; |
| |
| delta = request - mp->m_resblks; |
| lcounter = free - delta; |
| if (lcounter < 0) |
| /* We can't satisfy the request, just get what we can */ |
| fdblks_delta = free; |
| else |
| fdblks_delta = delta; |
| |
| /* |
| * We'll either succeed in getting space from the free block |
| * count or we'll get an ENOSPC. If we get a ENOSPC, it means |
| * things changed while we were calculating fdblks_delta and so |
| * we should try again to see if there is anything left to |
| * reserve. |
| * |
| * Don't set the reserved flag here - we don't want to reserve |
| * the extra reserve blocks from the reserve..... |
| */ |
| spin_unlock(&mp->m_sb_lock); |
| error = xfs_mod_fdblocks(mp, -fdblks_delta, 0); |
| spin_lock(&mp->m_sb_lock); |
| } while (error == -ENOSPC); |
| |
| /* |
| * Update the reserve counters if blocks have been successfully |
| * allocated. |
| */ |
| if (!error && fdblks_delta) { |
| mp->m_resblks += fdblks_delta; |
| mp->m_resblks_avail += fdblks_delta; |
| } |
| |
| out: |
| if (outval) { |
| outval->resblks = mp->m_resblks; |
| outval->resblks_avail = mp->m_resblks_avail; |
| } |
| |
| spin_unlock(&mp->m_sb_lock); |
| return error; |
| } |
| |
| int |
| xfs_fs_goingdown( |
| xfs_mount_t *mp, |
| uint32_t inflags) |
| { |
| switch (inflags) { |
| case XFS_FSOP_GOING_FLAGS_DEFAULT: { |
| struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); |
| |
| if (sb && !IS_ERR(sb)) { |
| xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
| thaw_bdev(sb->s_bdev, sb); |
| } |
| |
| break; |
| } |
| case XFS_FSOP_GOING_FLAGS_LOGFLUSH: |
| xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
| break; |
| case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: |
| xfs_force_shutdown(mp, |
| SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Force a shutdown of the filesystem instantly while keeping the filesystem |
| * consistent. We don't do an unmount here; just shutdown the shop, make sure |
| * that absolutely nothing persistent happens to this filesystem after this |
| * point. |
| */ |
| void |
| xfs_do_force_shutdown( |
| xfs_mount_t *mp, |
| int flags, |
| char *fname, |
| int lnnum) |
| { |
| int logerror; |
| |
| logerror = flags & SHUTDOWN_LOG_IO_ERROR; |
| |
| if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { |
| xfs_notice(mp, |
| "%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT, |
| __func__, flags, lnnum, fname, __return_address); |
| } |
| /* |
| * No need to duplicate efforts. |
| */ |
| if (XFS_FORCED_SHUTDOWN(mp) && !logerror) |
| return; |
| |
| /* |
| * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't |
| * queue up anybody new on the log reservations, and wakes up |
| * everybody who's sleeping on log reservations to tell them |
| * the bad news. |
| */ |
| if (xfs_log_force_umount(mp, logerror)) |
| return; |
| |
| if (flags & SHUTDOWN_CORRUPT_INCORE) { |
| xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, |
| "Corruption of in-memory data detected. Shutting down filesystem"); |
| if (XFS_ERRLEVEL_HIGH <= xfs_error_level) |
| xfs_stack_trace(); |
| } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { |
| if (logerror) { |
| xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, |
| "Log I/O Error Detected. Shutting down filesystem"); |
| } else if (flags & SHUTDOWN_DEVICE_REQ) { |
| xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, |
| "All device paths lost. Shutting down filesystem"); |
| } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { |
| xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, |
| "I/O Error Detected. Shutting down filesystem"); |
| } |
| } |
| if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { |
| xfs_alert(mp, |
| "Please umount the filesystem and rectify the problem(s)"); |
| } |
| } |
| |
| /* |
| * Reserve free space for per-AG metadata. |
| */ |
| int |
| xfs_fs_reserve_ag_blocks( |
| struct xfs_mount *mp) |
| { |
| xfs_agnumber_t agno; |
| struct xfs_perag *pag; |
| int error = 0; |
| int err2; |
| |
| for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { |
| pag = xfs_perag_get(mp, agno); |
| err2 = xfs_ag_resv_init(pag); |
| xfs_perag_put(pag); |
| if (err2 && !error) |
| error = err2; |
| } |
| |
| if (error && error != -ENOSPC) { |
| xfs_warn(mp, |
| "Error %d reserving per-AG metadata reserve pool.", error); |
| xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
| } |
| |
| return error; |
| } |
| |
| /* |
| * Free space reserved for per-AG metadata. |
| */ |
| int |
| xfs_fs_unreserve_ag_blocks( |
| struct xfs_mount *mp) |
| { |
| xfs_agnumber_t agno; |
| struct xfs_perag *pag; |
| int error = 0; |
| int err2; |
| |
| for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { |
| pag = xfs_perag_get(mp, agno); |
| err2 = xfs_ag_resv_free(pag); |
| xfs_perag_put(pag); |
| if (err2 && !error) |
| error = err2; |
| } |
| |
| if (error) |
| xfs_warn(mp, |
| "Error %d freeing per-AG metadata reserve pool.", error); |
| |
| return error; |
| } |