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![Chandra Seetharaman](/assets/img/avatar_default.png)
Check the return value of xfs_buf_get() and fail appropriately. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Alex Elder <aelder@sgi.com>
695 lines
19 KiB
C
695 lines
19 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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_types.h"
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#include "xfs_bit.h"
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#include "xfs_inum.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_btree.h"
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#include "xfs_error.h"
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#include "xfs_alloc.h"
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#include "xfs_ialloc.h"
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#include "xfs_fsops.h"
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#include "xfs_itable.h"
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#include "xfs_trans_space.h"
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#include "xfs_rtalloc.h"
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#include "xfs_rw.h"
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#include "xfs_filestream.h"
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#include "xfs_trace.h"
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/*
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* File system operations
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*/
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int
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xfs_fs_geometry(
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xfs_mount_t *mp,
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xfs_fsop_geom_t *geo,
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int new_version)
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{
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memset(geo, 0, sizeof(*geo));
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geo->blocksize = mp->m_sb.sb_blocksize;
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geo->rtextsize = mp->m_sb.sb_rextsize;
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geo->agblocks = mp->m_sb.sb_agblocks;
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geo->agcount = mp->m_sb.sb_agcount;
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geo->logblocks = mp->m_sb.sb_logblocks;
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geo->sectsize = mp->m_sb.sb_sectsize;
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geo->inodesize = mp->m_sb.sb_inodesize;
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geo->imaxpct = mp->m_sb.sb_imax_pct;
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geo->datablocks = mp->m_sb.sb_dblocks;
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geo->rtblocks = mp->m_sb.sb_rblocks;
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geo->rtextents = mp->m_sb.sb_rextents;
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geo->logstart = mp->m_sb.sb_logstart;
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ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
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memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
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if (new_version >= 2) {
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geo->sunit = mp->m_sb.sb_unit;
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geo->swidth = mp->m_sb.sb_width;
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}
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if (new_version >= 3) {
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geo->version = XFS_FSOP_GEOM_VERSION;
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geo->flags =
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(xfs_sb_version_hasattr(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
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(xfs_sb_version_hasnlink(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
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(xfs_sb_version_hasquota(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
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(xfs_sb_version_hasalign(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
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(xfs_sb_version_hasdalign(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
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(xfs_sb_version_hasshared(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
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(xfs_sb_version_hasextflgbit(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
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(xfs_sb_version_hasdirv2(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
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(xfs_sb_version_hassector(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
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(xfs_sb_version_hasasciici(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
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(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
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(xfs_sb_version_hasattr2(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
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geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
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mp->m_sb.sb_logsectsize : BBSIZE;
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geo->rtsectsize = mp->m_sb.sb_blocksize;
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geo->dirblocksize = mp->m_dirblksize;
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}
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if (new_version >= 4) {
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geo->flags |=
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(xfs_sb_version_haslogv2(&mp->m_sb) ?
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XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
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geo->logsunit = mp->m_sb.sb_logsunit;
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}
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return 0;
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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_agf_t *agf;
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xfs_agi_t *agi;
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xfs_agnumber_t agno;
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xfs_extlen_t agsize;
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xfs_extlen_t tmpsize;
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xfs_alloc_rec_t *arec;
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struct xfs_btree_block *block;
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xfs_buf_t *bp;
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int bucket;
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int dpct;
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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_rfsblock_t nfree;
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xfs_agnumber_t oagcount;
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int pct;
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xfs_trans_t *tp;
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nb = in->newblocks;
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pct = in->imaxpct;
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if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
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return XFS_ERROR(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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dpct = pct - mp->m_sb.sb_imax_pct;
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bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
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XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
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BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
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if (!bp)
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return EIO;
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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 XFS_ERROR(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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tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
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tp->t_flags |= XFS_TRANS_RESERVE;
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if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
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XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
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xfs_trans_cancel(tp, 0);
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return error;
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}
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/*
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* Write new AG headers to disk. Non-transactional, but written
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* synchronously so they are completed prior to the growfs transaction
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* being logged.
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*/
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nfree = 0;
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for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
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/*
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* AG freelist header block
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*/
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bp = xfs_buf_get(mp->m_ddev_targp,
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XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
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XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
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if (!bp) {
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error = ENOMEM;
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goto error0;
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}
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agf = XFS_BUF_TO_AGF(bp);
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memset(agf, 0, mp->m_sb.sb_sectsize);
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agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
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agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
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agf->agf_seqno = cpu_to_be32(agno);
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if (agno == nagcount - 1)
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agsize =
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nb -
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(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
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else
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agsize = mp->m_sb.sb_agblocks;
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agf->agf_length = cpu_to_be32(agsize);
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agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
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agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
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agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
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agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
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agf->agf_flfirst = 0;
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agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
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agf->agf_flcount = 0;
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tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
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agf->agf_freeblks = cpu_to_be32(tmpsize);
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agf->agf_longest = cpu_to_be32(tmpsize);
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error = xfs_bwrite(bp);
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xfs_buf_relse(bp);
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if (error)
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goto error0;
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/*
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* AG inode header block
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*/
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bp = xfs_buf_get(mp->m_ddev_targp,
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XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
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XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
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if (!bp) {
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error = ENOMEM;
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goto error0;
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}
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agi = XFS_BUF_TO_AGI(bp);
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memset(agi, 0, mp->m_sb.sb_sectsize);
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agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
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agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
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agi->agi_seqno = cpu_to_be32(agno);
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agi->agi_length = cpu_to_be32(agsize);
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agi->agi_count = 0;
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agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
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agi->agi_level = cpu_to_be32(1);
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agi->agi_freecount = 0;
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agi->agi_newino = cpu_to_be32(NULLAGINO);
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agi->agi_dirino = cpu_to_be32(NULLAGINO);
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for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
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agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
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error = xfs_bwrite(bp);
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xfs_buf_relse(bp);
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if (error)
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goto error0;
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/*
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* BNO btree root block
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*/
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bp = xfs_buf_get(mp->m_ddev_targp,
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XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
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BTOBB(mp->m_sb.sb_blocksize),
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XBF_LOCK | XBF_MAPPED);
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if (!bp) {
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error = ENOMEM;
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goto error0;
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}
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block = XFS_BUF_TO_BLOCK(bp);
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memset(block, 0, mp->m_sb.sb_blocksize);
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block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
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block->bb_level = 0;
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block->bb_numrecs = cpu_to_be16(1);
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block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
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block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
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arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
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arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
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arec->ar_blockcount = cpu_to_be32(
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agsize - be32_to_cpu(arec->ar_startblock));
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error = xfs_bwrite(bp);
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xfs_buf_relse(bp);
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if (error)
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goto error0;
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/*
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* CNT btree root block
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*/
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bp = xfs_buf_get(mp->m_ddev_targp,
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XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
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BTOBB(mp->m_sb.sb_blocksize),
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XBF_LOCK | XBF_MAPPED);
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if (!bp) {
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error = ENOMEM;
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goto error0;
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}
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block = XFS_BUF_TO_BLOCK(bp);
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memset(block, 0, mp->m_sb.sb_blocksize);
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block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
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block->bb_level = 0;
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block->bb_numrecs = cpu_to_be16(1);
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block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
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block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
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arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
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arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
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arec->ar_blockcount = cpu_to_be32(
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agsize - be32_to_cpu(arec->ar_startblock));
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nfree += be32_to_cpu(arec->ar_blockcount);
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error = xfs_bwrite(bp);
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xfs_buf_relse(bp);
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if (error)
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goto error0;
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/*
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* INO btree root block
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*/
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bp = xfs_buf_get(mp->m_ddev_targp,
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XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
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BTOBB(mp->m_sb.sb_blocksize),
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XBF_LOCK | XBF_MAPPED);
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if (!bp) {
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error = ENOMEM;
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goto error0;
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}
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block = XFS_BUF_TO_BLOCK(bp);
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memset(block, 0, mp->m_sb.sb_blocksize);
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block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
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block->bb_level = 0;
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block->bb_numrecs = 0;
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block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
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block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
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error = xfs_bwrite(bp);
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xfs_buf_relse(bp);
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if (error)
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goto error0;
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}
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xfs_trans_agblocks_delta(tp, nfree);
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/*
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* There are new blocks in the old last a.g.
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*/
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if (new) {
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/*
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* Change the agi length.
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*/
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error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
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if (error) {
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goto error0;
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}
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ASSERT(bp);
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agi = XFS_BUF_TO_AGI(bp);
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be32_add_cpu(&agi->agi_length, new);
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ASSERT(nagcount == oagcount ||
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be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
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xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
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/*
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* Change agf length.
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*/
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error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
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if (error) {
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goto error0;
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}
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ASSERT(bp);
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agf = XFS_BUF_TO_AGF(bp);
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be32_add_cpu(&agf->agf_length, new);
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ASSERT(be32_to_cpu(agf->agf_length) ==
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be32_to_cpu(agi->agi_length));
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xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
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/*
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* Free the new space.
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*/
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error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
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be32_to_cpu(agf->agf_length) - new), new);
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if (error) {
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goto error0;
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}
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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 (nfree)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
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if (dpct)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
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error = xfs_trans_commit(tp, 0);
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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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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 = icount << mp->m_sb.sb_inopblog;
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} else
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mp->m_maxicount = 0;
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xfs_set_low_space_thresholds(mp);
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/* update secondary superblocks. */
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for (agno = 1; agno < nagcount; agno++) {
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error = xfs_read_buf(mp, mp->m_ddev_targp,
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XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
|
|
XFS_FSS_TO_BB(mp, 1), 0, &bp);
|
|
if (error) {
|
|
xfs_warn(mp,
|
|
"error %d reading secondary superblock for ag %d",
|
|
error, agno);
|
|
break;
|
|
}
|
|
xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
|
|
/*
|
|
* If we get an error writing out the alternate superblocks,
|
|
* just issue a warning and continue. The real work is
|
|
* already done and committed.
|
|
*/
|
|
error = xfs_bwrite(bp);
|
|
xfs_buf_relse(bp);
|
|
if (error) {
|
|
xfs_warn(mp,
|
|
"write error %d updating secondary superblock for ag %d",
|
|
error, agno);
|
|
break; /* no point in continuing */
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
error0:
|
|
xfs_trans_cancel(tp, XFS_TRANS_ABORT);
|
|
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 XFS_ERROR(EINVAL);
|
|
if (nb == mp->m_sb.sb_logblocks &&
|
|
in->isint == (mp->m_sb.sb_logstart != 0))
|
|
return XFS_ERROR(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 XFS_ERROR(ENOSYS);
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
xfs_mount_t *mp,
|
|
xfs_growfs_data_t *in)
|
|
{
|
|
int error;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return XFS_ERROR(EPERM);
|
|
if (!mutex_trylock(&mp->m_growlock))
|
|
return XFS_ERROR(EWOULDBLOCK);
|
|
error = xfs_growfs_data_private(mp, in);
|
|
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 XFS_ERROR(EPERM);
|
|
if (!mutex_trylock(&mp->m_growlock))
|
|
return XFS_ERROR(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)
|
|
{
|
|
xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
|
|
spin_lock(&mp->m_sb_lock);
|
|
cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
|
|
cnt->freertx = mp->m_sb.sb_frextents;
|
|
cnt->freeino = mp->m_sb.sb_ifree;
|
|
cnt->allocino = mp->m_sb.sb_icount;
|
|
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, fdblks_delta;
|
|
__uint64_t request;
|
|
|
|
/* 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 needto 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.
|
|
*
|
|
* We also use the xfs_mod_incore_sb() interface so that we
|
|
* don't have to care about whether per cpu counter are
|
|
* enabled, disabled or even compiled in....
|
|
*/
|
|
retry:
|
|
spin_lock(&mp->m_sb_lock);
|
|
xfs_icsb_sync_counters_locked(mp, 0);
|
|
|
|
/*
|
|
* If our previous reservation was larger than the current value,
|
|
* then move any unused blocks back to the free pool.
|
|
*/
|
|
fdblks_delta = 0;
|
|
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;
|
|
} else {
|
|
__int64_t free;
|
|
|
|
free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
|
|
if (!free)
|
|
goto out; /* ENOSPC and fdblks_delta = 0 */
|
|
|
|
delta = request - mp->m_resblks;
|
|
lcounter = free - delta;
|
|
if (lcounter < 0) {
|
|
/* We can't satisfy the request, just get what we can */
|
|
mp->m_resblks += free;
|
|
mp->m_resblks_avail += free;
|
|
fdblks_delta = -free;
|
|
} else {
|
|
fdblks_delta = -delta;
|
|
mp->m_resblks = request;
|
|
mp->m_resblks_avail += delta;
|
|
}
|
|
}
|
|
out:
|
|
if (outval) {
|
|
outval->resblks = mp->m_resblks;
|
|
outval->resblks_avail = mp->m_resblks_avail;
|
|
}
|
|
spin_unlock(&mp->m_sb_lock);
|
|
|
|
if (fdblks_delta) {
|
|
/*
|
|
* If we are putting blocks back here, m_resblks_avail is
|
|
* already at its max so this will put it in the free pool.
|
|
*
|
|
* If we need space, we'll either succeed in getting it
|
|
* 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.....
|
|
*/
|
|
int error;
|
|
error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
|
|
fdblks_delta, 0);
|
|
if (error == ENOSPC)
|
|
goto retry;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Dump a transaction into the log that contains no real change. This is needed
|
|
* to be able to make the log dirty or stamp the current tail LSN into the log
|
|
* during the covering operation.
|
|
*
|
|
* We cannot use an inode here for this - that will push dirty state back up
|
|
* into the VFS and then periodic inode flushing will prevent log covering from
|
|
* making progress. Hence we log a field in the superblock instead and use a
|
|
* synchronous transaction to ensure the superblock is immediately unpinned
|
|
* and can be written back.
|
|
*/
|
|
int
|
|
xfs_fs_log_dummy(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
|
|
tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
|
|
error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
|
|
XFS_DEFAULT_LOG_COUNT);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
/* log the UUID because it is an unchanging field */
|
|
xfs_mod_sb(tp, XFS_SB_UUID);
|
|
xfs_trans_set_sync(tp);
|
|
return xfs_trans_commit(tp, 0);
|
|
}
|
|
|
|
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 XFS_ERROR(EINVAL);
|
|
}
|
|
|
|
return 0;
|
|
}
|