mirror of https://gitee.com/openkylin/linux.git
579 lines
14 KiB
C
579 lines
14 KiB
C
// 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_defer.h"
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#include "xfs_trans.h"
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#include "xfs_error.h"
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#include "xfs_btree.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_rtalloc.h"
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#include "xfs_trace.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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* growfs operations
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*/
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static int
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xfs_growfs_data_private(
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xfs_mount_t *mp, /* mount point for filesystem */
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xfs_growfs_data_t *in) /* growfs data input struct */
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{
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xfs_buf_t *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_mod;
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xfs_rfsblock_t new;
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xfs_agnumber_t oagcount;
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xfs_trans_t *tp;
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struct aghdr_init_data id = {};
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nb = in->newblocks;
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if (nb < mp->m_sb.sb_dblocks)
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return -EINVAL;
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if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
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return error;
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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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new = nb; /* use new as a temporary here */
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nb_mod = do_div(new, mp->m_sb.sb_agblocks);
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nagcount = new + (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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if (nb < mp->m_sb.sb_dblocks)
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return -EINVAL;
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}
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new = nb - mp->m_sb.sb_dblocks;
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oagcount = mp->m_sb.sb_agcount;
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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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}
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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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/*
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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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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--, new -= id.agsize) {
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if (id.agno == nagcount - 1)
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id.agsize = nb -
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(id.agno * (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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goto out_trans_cancel;
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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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goto out_trans_cancel;
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xfs_trans_agblocks_delta(tp, id.nfree);
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/* If there are new blocks in the old last AG, extend it. */
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if (new) {
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error = xfs_ag_extend_space(mp, tp, &id, new);
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if (error)
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goto out_trans_cancel;
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}
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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 (nb > mp->m_sb.sb_dblocks)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
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nb - mp->m_sb.sb_dblocks);
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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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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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/*
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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 (new) {
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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 was a
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* growfs failure, just that there still isn't space for new user data
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* 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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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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xfs_mount_t *mp, /* mount point for filesystem */
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xfs_growfs_log_t *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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* 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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/* 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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mp->m_maxicount = XFS_FSB_TO_INO(mp, icount);
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} else
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mp->m_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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xfs_growfs_log_t *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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/* 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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* 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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* 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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* 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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* 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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struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
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if (sb && !IS_ERR(sb)) {
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xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
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thaw_bdev(sb->s_bdev, sb);
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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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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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|
|
/*
|
|
* 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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if (xfs_log_force_umount(mp, logerror))
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return;
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|
|
if (flags & SHUTDOWN_FORCE_UMOUNT) {
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xfs_alert(mp,
|
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"User initiated shutdown received. Shutting down filesystem");
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return;
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}
|
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|
|
xfs_notice(mp,
|
|
"%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT,
|
|
__func__, flags, lnnum, fname, __return_address);
|
|
|
|
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 (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");
|
|
}
|
|
|
|
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 (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
|
|
pag = xfs_perag_get(mp, agno);
|
|
err2 = xfs_ag_resv_init(pag, NULL);
|
|
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;
|
|
}
|