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617 lines
15 KiB
617 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2000-2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.h" |
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#include "xfs_format.h" |
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#include "xfs_log_format.h" |
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#include "xfs_trans_resv.h" |
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#include "xfs_sb.h" |
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#include "xfs_mount.h" |
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#include "xfs_trans.h" |
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#include "xfs_error.h" |
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#include "xfs_alloc.h" |
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#include "xfs_fsops.h" |
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#include "xfs_trans_space.h" |
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#include "xfs_log.h" |
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#include "xfs_ag.h" |
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#include "xfs_ag_resv.h" |
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|
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/* |
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* Write new AG headers to disk. Non-transactional, but need to be |
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* written and completed prior to the growfs transaction being logged. |
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* To do this, we use a delayed write buffer list and wait for |
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* submission and IO completion of the list as a whole. This allows the |
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* IO subsystem to merge all the AG headers in a single AG into a single |
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* IO and hide most of the latency of the IO from us. |
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* |
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* This also means that if we get an error whilst building the buffer |
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* list to write, we can cancel the entire list without having written |
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* anything. |
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*/ |
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static int |
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xfs_resizefs_init_new_ags( |
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struct xfs_trans *tp, |
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struct aghdr_init_data *id, |
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xfs_agnumber_t oagcount, |
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xfs_agnumber_t nagcount, |
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xfs_rfsblock_t delta, |
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bool *lastag_extended) |
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{ |
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struct xfs_mount *mp = tp->t_mountp; |
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xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta; |
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int error; |
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|
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*lastag_extended = false; |
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|
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INIT_LIST_HEAD(&id->buffer_list); |
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for (id->agno = nagcount - 1; |
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id->agno >= oagcount; |
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id->agno--, delta -= id->agsize) { |
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|
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if (id->agno == nagcount - 1) |
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id->agsize = nb - (id->agno * |
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(xfs_rfsblock_t)mp->m_sb.sb_agblocks); |
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else |
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id->agsize = mp->m_sb.sb_agblocks; |
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error = xfs_ag_init_headers(mp, id); |
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if (error) { |
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xfs_buf_delwri_cancel(&id->buffer_list); |
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return error; |
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} |
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} |
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error = xfs_buf_delwri_submit(&id->buffer_list); |
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if (error) |
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return error; |
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if (delta) { |
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*lastag_extended = true; |
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error = xfs_ag_extend_space(mp, tp, id, delta); |
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} |
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return error; |
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} |
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|
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/* |
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* growfs operations |
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*/ |
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static int |
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xfs_growfs_data_private( |
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struct xfs_mount *mp, /* mount point for filesystem */ |
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struct xfs_growfs_data *in) /* growfs data input struct */ |
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{ |
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struct xfs_buf *bp; |
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int error; |
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xfs_agnumber_t nagcount; |
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xfs_agnumber_t nagimax = 0; |
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xfs_rfsblock_t nb, nb_div, nb_mod; |
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int64_t delta; |
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bool lastag_extended; |
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xfs_agnumber_t oagcount; |
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struct xfs_trans *tp; |
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struct aghdr_init_data id = {}; |
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nb = in->newblocks; |
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error = xfs_sb_validate_fsb_count(&mp->m_sb, nb); |
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if (error) |
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return error; |
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if (nb > mp->m_sb.sb_dblocks) { |
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error = xfs_buf_read_uncached(mp->m_ddev_targp, |
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XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), |
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XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
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if (error) |
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return error; |
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xfs_buf_relse(bp); |
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} |
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nb_div = nb; |
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nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks); |
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nagcount = nb_div + (nb_mod != 0); |
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if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { |
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nagcount--; |
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nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; |
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} |
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delta = nb - mp->m_sb.sb_dblocks; |
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/* |
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* Reject filesystems with a single AG because they are not |
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* supported, and reject a shrink operation that would cause a |
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* filesystem to become unsupported. |
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*/ |
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if (delta < 0 && nagcount < 2) |
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return -EINVAL; |
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oagcount = mp->m_sb.sb_agcount; |
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|
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/* allocate the new per-ag structures */ |
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if (nagcount > oagcount) { |
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error = xfs_initialize_perag(mp, nagcount, &nagimax); |
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if (error) |
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return error; |
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} else if (nagcount < oagcount) { |
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/* TODO: shrinking the entire AGs hasn't yet completed */ |
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return -EINVAL; |
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} |
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
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(delta > 0 ? XFS_GROWFS_SPACE_RES(mp) : -delta), 0, |
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XFS_TRANS_RESERVE, &tp); |
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if (error) |
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return error; |
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if (delta > 0) { |
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error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount, |
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delta, &lastag_extended); |
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} else { |
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static struct ratelimit_state shrink_warning = \ |
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RATELIMIT_STATE_INIT("shrink_warning", 86400 * HZ, 1); |
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ratelimit_set_flags(&shrink_warning, RATELIMIT_MSG_ON_RELEASE); |
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if (__ratelimit(&shrink_warning)) |
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xfs_alert(mp, |
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"EXPERIMENTAL online shrink feature in use. Use at your own risk!"); |
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error = xfs_ag_shrink_space(mp, &tp, nagcount - 1, -delta); |
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} |
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if (error) |
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goto out_trans_cancel; |
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/* |
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* Update changed superblock fields transactionally. These are not |
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* seen by the rest of the world until the transaction commit applies |
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* them atomically to the superblock. |
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*/ |
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if (nagcount > oagcount) |
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); |
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if (delta) |
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta); |
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if (id.nfree) |
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree); |
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/* |
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* Sync sb counters now to reflect the updated values. This is |
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* particularly important for shrink because the write verifier |
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* will fail if sb_fdblocks is ever larger than sb_dblocks. |
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*/ |
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if (xfs_sb_version_haslazysbcount(&mp->m_sb)) |
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xfs_log_sb(tp); |
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xfs_trans_set_sync(tp); |
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error = xfs_trans_commit(tp); |
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if (error) |
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return error; |
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/* New allocation groups fully initialized, so update mount struct */ |
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if (nagimax) |
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mp->m_maxagi = nagimax; |
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xfs_set_low_space_thresholds(mp); |
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mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); |
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if (delta > 0) { |
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/* |
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* If we expanded the last AG, free the per-AG reservation |
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* so we can reinitialize it with the new size. |
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*/ |
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if (lastag_extended) { |
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struct xfs_perag *pag; |
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pag = xfs_perag_get(mp, id.agno); |
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error = xfs_ag_resv_free(pag); |
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xfs_perag_put(pag); |
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if (error) |
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return error; |
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} |
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/* |
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* Reserve AG metadata blocks. ENOSPC here does not mean there |
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* was a growfs failure, just that there still isn't space for |
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* new user data after the grow has been run. |
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*/ |
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error = xfs_fs_reserve_ag_blocks(mp); |
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if (error == -ENOSPC) |
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error = 0; |
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} |
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return error; |
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out_trans_cancel: |
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xfs_trans_cancel(tp); |
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return error; |
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} |
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static int |
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xfs_growfs_log_private( |
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struct xfs_mount *mp, /* mount point for filesystem */ |
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struct xfs_growfs_log *in) /* growfs log input struct */ |
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{ |
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xfs_extlen_t nb; |
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nb = in->newblocks; |
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if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) |
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return -EINVAL; |
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if (nb == mp->m_sb.sb_logblocks && |
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in->isint == (mp->m_sb.sb_logstart != 0)) |
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return -EINVAL; |
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/* |
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* Moving the log is hard, need new interfaces to sync |
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* the log first, hold off all activity while moving it. |
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* Can have shorter or longer log in the same space, |
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* or transform internal to external log or vice versa. |
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*/ |
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return -ENOSYS; |
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} |
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static int |
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xfs_growfs_imaxpct( |
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struct xfs_mount *mp, |
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__u32 imaxpct) |
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{ |
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struct xfs_trans *tp; |
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int dpct; |
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int error; |
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if (imaxpct > 100) |
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return -EINVAL; |
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
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XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); |
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if (error) |
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return error; |
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dpct = imaxpct - mp->m_sb.sb_imax_pct; |
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); |
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xfs_trans_set_sync(tp); |
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return xfs_trans_commit(tp); |
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} |
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|
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/* |
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* protected versions of growfs function acquire and release locks on the mount |
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* point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, |
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* XFS_IOC_FSGROWFSRT |
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*/ |
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int |
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xfs_growfs_data( |
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struct xfs_mount *mp, |
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struct xfs_growfs_data *in) |
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{ |
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int error = 0; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (!mutex_trylock(&mp->m_growlock)) |
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return -EWOULDBLOCK; |
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|
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/* update imaxpct separately to the physical grow of the filesystem */ |
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if (in->imaxpct != mp->m_sb.sb_imax_pct) { |
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error = xfs_growfs_imaxpct(mp, in->imaxpct); |
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if (error) |
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goto out_error; |
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} |
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if (in->newblocks != mp->m_sb.sb_dblocks) { |
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error = xfs_growfs_data_private(mp, in); |
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if (error) |
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goto out_error; |
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} |
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/* Post growfs calculations needed to reflect new state in operations */ |
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if (mp->m_sb.sb_imax_pct) { |
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uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; |
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do_div(icount, 100); |
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M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount); |
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} else |
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M_IGEO(mp)->maxicount = 0; |
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/* Update secondary superblocks now the physical grow has completed */ |
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error = xfs_update_secondary_sbs(mp); |
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out_error: |
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/* |
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* Increment the generation unconditionally, the error could be from |
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* updating the secondary superblocks, in which case the new size |
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* is live already. |
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*/ |
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mp->m_generation++; |
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mutex_unlock(&mp->m_growlock); |
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return error; |
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} |
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int |
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xfs_growfs_log( |
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xfs_mount_t *mp, |
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struct xfs_growfs_log *in) |
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{ |
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int error; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (!mutex_trylock(&mp->m_growlock)) |
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return -EWOULDBLOCK; |
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error = xfs_growfs_log_private(mp, in); |
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mutex_unlock(&mp->m_growlock); |
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return error; |
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} |
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/* |
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* exported through ioctl XFS_IOC_FSCOUNTS |
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*/ |
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void |
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xfs_fs_counts( |
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xfs_mount_t *mp, |
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xfs_fsop_counts_t *cnt) |
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{ |
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cnt->allocino = percpu_counter_read_positive(&mp->m_icount); |
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cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); |
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cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - |
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mp->m_alloc_set_aside; |
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spin_lock(&mp->m_sb_lock); |
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cnt->freertx = mp->m_sb.sb_frextents; |
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spin_unlock(&mp->m_sb_lock); |
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} |
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/* |
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* exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS |
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* |
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* xfs_reserve_blocks is called to set m_resblks |
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* in the in-core mount table. The number of unused reserved blocks |
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* is kept in m_resblks_avail. |
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* |
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* Reserve the requested number of blocks if available. Otherwise return |
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* as many as possible to satisfy the request. The actual number |
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* reserved are returned in outval |
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* |
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* A null inval pointer indicates that only the current reserved blocks |
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* available should be returned no settings are changed. |
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*/ |
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int |
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xfs_reserve_blocks( |
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xfs_mount_t *mp, |
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uint64_t *inval, |
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xfs_fsop_resblks_t *outval) |
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{ |
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int64_t lcounter, delta; |
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int64_t fdblks_delta = 0; |
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uint64_t request; |
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int64_t free; |
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int error = 0; |
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|
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/* If inval is null, report current values and return */ |
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if (inval == (uint64_t *)NULL) { |
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if (!outval) |
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return -EINVAL; |
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outval->resblks = mp->m_resblks; |
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outval->resblks_avail = mp->m_resblks_avail; |
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return 0; |
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} |
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request = *inval; |
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/* |
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* With per-cpu counters, this becomes an interesting problem. we need |
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* to work out if we are freeing or allocation blocks first, then we can |
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* do the modification as necessary. |
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* |
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* We do this under the m_sb_lock so that if we are near ENOSPC, we will |
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* hold out any changes while we work out what to do. This means that |
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* the amount of free space can change while we do this, so we need to |
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* retry if we end up trying to reserve more space than is available. |
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*/ |
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spin_lock(&mp->m_sb_lock); |
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|
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/* |
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* If our previous reservation was larger than the current value, |
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* then move any unused blocks back to the free pool. Modify the resblks |
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* counters directly since we shouldn't have any problems unreserving |
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* space. |
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*/ |
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if (mp->m_resblks > request) { |
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lcounter = mp->m_resblks_avail - request; |
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if (lcounter > 0) { /* release unused blocks */ |
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fdblks_delta = lcounter; |
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mp->m_resblks_avail -= lcounter; |
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} |
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mp->m_resblks = request; |
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if (fdblks_delta) { |
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spin_unlock(&mp->m_sb_lock); |
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error = xfs_mod_fdblocks(mp, fdblks_delta, 0); |
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spin_lock(&mp->m_sb_lock); |
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} |
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goto out; |
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} |
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|
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/* |
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* If the request is larger than the current reservation, reserve the |
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* blocks before we update the reserve counters. Sample m_fdblocks and |
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* perform a partial reservation if the request exceeds free space. |
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*/ |
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error = -ENOSPC; |
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do { |
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free = percpu_counter_sum(&mp->m_fdblocks) - |
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mp->m_alloc_set_aside; |
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if (free <= 0) |
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break; |
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delta = request - mp->m_resblks; |
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lcounter = free - delta; |
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if (lcounter < 0) |
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/* We can't satisfy the request, just get what we can */ |
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fdblks_delta = free; |
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else |
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fdblks_delta = delta; |
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|
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/* |
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* We'll either succeed in getting space from the free block |
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* count or we'll get an ENOSPC. If we get a ENOSPC, it means |
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* things changed while we were calculating fdblks_delta and so |
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* we should try again to see if there is anything left to |
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* reserve. |
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* |
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* Don't set the reserved flag here - we don't want to reserve |
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* the extra reserve blocks from the reserve..... |
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*/ |
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spin_unlock(&mp->m_sb_lock); |
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error = xfs_mod_fdblocks(mp, -fdblks_delta, 0); |
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spin_lock(&mp->m_sb_lock); |
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} while (error == -ENOSPC); |
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|
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/* |
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* Update the reserve counters if blocks have been successfully |
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* allocated. |
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*/ |
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if (!error && fdblks_delta) { |
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mp->m_resblks += fdblks_delta; |
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mp->m_resblks_avail += fdblks_delta; |
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} |
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out: |
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if (outval) { |
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outval->resblks = mp->m_resblks; |
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outval->resblks_avail = mp->m_resblks_avail; |
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} |
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|
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spin_unlock(&mp->m_sb_lock); |
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return error; |
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} |
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|
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int |
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xfs_fs_goingdown( |
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xfs_mount_t *mp, |
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uint32_t inflags) |
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{ |
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switch (inflags) { |
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case XFS_FSOP_GOING_FLAGS_DEFAULT: { |
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if (!freeze_bdev(mp->m_super->s_bdev)) { |
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xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
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thaw_bdev(mp->m_super->s_bdev); |
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} |
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break; |
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} |
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case XFS_FSOP_GOING_FLAGS_LOGFLUSH: |
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xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
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break; |
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case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: |
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xfs_force_shutdown(mp, |
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SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); |
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break; |
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default: |
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return -EINVAL; |
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} |
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|
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return 0; |
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} |
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|
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/* |
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* Force a shutdown of the filesystem instantly while keeping the filesystem |
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* consistent. We don't do an unmount here; just shutdown the shop, make sure |
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* that absolutely nothing persistent happens to this filesystem after this |
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* point. |
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*/ |
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void |
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xfs_do_force_shutdown( |
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struct xfs_mount *mp, |
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int flags, |
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char *fname, |
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int lnnum) |
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{ |
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bool logerror = flags & SHUTDOWN_LOG_IO_ERROR; |
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|
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/* |
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* No need to duplicate efforts. |
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*/ |
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if (XFS_FORCED_SHUTDOWN(mp) && !logerror) |
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return; |
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|
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/* |
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* This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't |
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* queue up anybody new on the log reservations, and wakes up |
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* everybody who's sleeping on log reservations to tell them |
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* the bad news. |
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*/ |
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if (xfs_log_force_umount(mp, logerror)) |
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return; |
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|
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if (flags & SHUTDOWN_FORCE_UMOUNT) { |
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xfs_alert(mp, |
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"User initiated shutdown (0x%x) received. Shutting down filesystem", |
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flags); |
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return; |
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} |
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|
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if (flags & SHUTDOWN_CORRUPT_INCORE) { |
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xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, |
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"Corruption of in-memory data (0x%x) detected at %pS (%s:%d). Shutting down filesystem", |
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flags, __return_address, fname, lnnum); |
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if (XFS_ERRLEVEL_HIGH <= xfs_error_level) |
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xfs_stack_trace(); |
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} else if (logerror) { |
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xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, |
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"Log I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem", |
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flags, __return_address, fname, lnnum); |
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} else { |
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xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, |
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"I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem", |
|
flags, __return_address, fname, lnnum); |
|
} |
|
|
|
xfs_alert(mp, |
|
"Please unmount 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; |
|
|
|
mp->m_finobt_nores = false; |
|
for_each_perag(mp, agno, pag) { |
|
err2 = xfs_ag_resv_init(pag, NULL); |
|
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_each_perag(mp, agno, pag) { |
|
err2 = xfs_ag_resv_free(pag); |
|
if (err2 && !error) |
|
error = err2; |
|
} |
|
|
|
if (error) |
|
xfs_warn(mp, |
|
"Error %d freeing per-AG metadata reserve pool.", error); |
|
|
|
return error; |
|
}
|
|
|