586 lines
14 KiB
C
586 lines
14 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_log.h"
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#include "xfs_inum.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_dir2.h"
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#include "xfs_dmapi.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_btree.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_inode.h"
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#include "xfs_dinode.h"
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#include "xfs_error.h"
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#include "xfs_mru_cache.h"
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#include "xfs_filestream.h"
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#include "xfs_vnodeops.h"
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#include "xfs_utils.h"
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#include "xfs_buf_item.h"
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#include "xfs_inode_item.h"
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#include "xfs_rw.h"
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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/*
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* Sync all the inodes in the given AG according to the
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* direction given by the flags.
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*/
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STATIC int
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xfs_sync_inodes_ag(
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xfs_mount_t *mp,
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int ag,
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int flags)
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{
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xfs_perag_t *pag = &mp->m_perag[ag];
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int nr_found;
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int first_index = 0;
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int error = 0;
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int last_error = 0;
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int fflag = XFS_B_ASYNC;
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int lock_flags = XFS_ILOCK_SHARED;
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if (flags & SYNC_DELWRI)
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fflag = XFS_B_DELWRI;
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if (flags & SYNC_WAIT)
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fflag = 0; /* synchronous overrides all */
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if (flags & SYNC_DELWRI) {
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/*
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* We need the I/O lock if we're going to call any of
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* the flush/inval routines.
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*/
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lock_flags |= XFS_IOLOCK_SHARED;
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}
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do {
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struct inode *inode;
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boolean_t inode_refed;
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xfs_inode_t *ip = NULL;
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/*
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* use a gang lookup to find the next inode in the tree
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* as the tree is sparse and a gang lookup walks to find
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* the number of objects requested.
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*/
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read_lock(&pag->pag_ici_lock);
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nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
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(void**)&ip, first_index, 1);
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if (!nr_found) {
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read_unlock(&pag->pag_ici_lock);
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break;
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}
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/* update the index for the next lookup */
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first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
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/*
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* skip inodes in reclaim. Let xfs_syncsub do that for
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* us so we don't need to worry.
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*/
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if (xfs_iflags_test(ip, (XFS_IRECLAIM|XFS_IRECLAIMABLE))) {
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read_unlock(&pag->pag_ici_lock);
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continue;
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}
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/* bad inodes are dealt with elsewhere */
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inode = VFS_I(ip);
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if (is_bad_inode(inode)) {
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read_unlock(&pag->pag_ici_lock);
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continue;
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}
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/* nothing to sync during shutdown */
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if (XFS_FORCED_SHUTDOWN(mp)) {
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read_unlock(&pag->pag_ici_lock);
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return 0;
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}
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/*
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* If we can't get a reference on the VFS_I, the inode must be
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* in reclaim. If we can get the inode lock without blocking,
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* it is safe to flush the inode because we hold the tree lock
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* and xfs_iextract will block right now. Hence if we lock the
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* inode while holding the tree lock, xfs_ireclaim() is
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* guaranteed to block on the inode lock we now hold and hence
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* it is safe to reference the inode until we drop the inode
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* locks completely.
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*/
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inode_refed = B_FALSE;
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if (igrab(inode)) {
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read_unlock(&pag->pag_ici_lock);
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xfs_ilock(ip, lock_flags);
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inode_refed = B_TRUE;
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} else {
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if (!xfs_ilock_nowait(ip, lock_flags)) {
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/* leave it to reclaim */
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read_unlock(&pag->pag_ici_lock);
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continue;
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}
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read_unlock(&pag->pag_ici_lock);
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}
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/*
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* If we have to flush data or wait for I/O completion
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* we need to drop the ilock that we currently hold.
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* If we need to drop the lock, insert a marker if we
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* have not already done so.
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*/
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if ((flags & SYNC_DELWRI) && VN_DIRTY(inode)) {
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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error = xfs_flush_pages(ip, 0, -1, fflag, FI_NONE);
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if (flags & SYNC_IOWAIT)
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vn_iowait(ip);
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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}
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if ((flags & SYNC_ATTR) && !xfs_inode_clean(ip)) {
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if (flags & SYNC_WAIT) {
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xfs_iflock(ip);
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if (!xfs_inode_clean(ip))
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error = xfs_iflush(ip, XFS_IFLUSH_SYNC);
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else
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xfs_ifunlock(ip);
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} else if (xfs_iflock_nowait(ip)) {
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if (!xfs_inode_clean(ip))
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error = xfs_iflush(ip, XFS_IFLUSH_DELWRI);
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else
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xfs_ifunlock(ip);
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}
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}
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if (lock_flags)
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xfs_iunlock(ip, lock_flags);
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if (inode_refed) {
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IRELE(ip);
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}
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if (error)
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last_error = error;
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/*
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* bail out if the filesystem is corrupted.
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*/
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if (error == EFSCORRUPTED)
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return XFS_ERROR(error);
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} while (nr_found);
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return last_error;
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}
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int
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xfs_sync_inodes(
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xfs_mount_t *mp,
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int flags)
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{
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int error;
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int last_error;
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int i;
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int lflags = XFS_LOG_FORCE;
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if (mp->m_flags & XFS_MOUNT_RDONLY)
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return 0;
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error = 0;
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last_error = 0;
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if (flags & SYNC_WAIT)
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lflags |= XFS_LOG_SYNC;
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for (i = 0; i < mp->m_sb.sb_agcount; i++) {
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if (!mp->m_perag[i].pag_ici_init)
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continue;
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error = xfs_sync_inodes_ag(mp, i, flags);
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if (error)
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last_error = error;
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if (error == EFSCORRUPTED)
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break;
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}
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if (flags & SYNC_DELWRI)
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xfs_log_force(mp, 0, lflags);
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return XFS_ERROR(last_error);
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}
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STATIC int
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xfs_commit_dummy_trans(
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struct xfs_mount *mp,
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uint log_flags)
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{
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struct xfs_inode *ip = mp->m_rootip;
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struct xfs_trans *tp;
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int error;
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/*
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* Put a dummy transaction in the log to tell recovery
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* that all others are OK.
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*/
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tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
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error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
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if (error) {
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xfs_trans_cancel(tp, 0);
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return error;
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}
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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xfs_trans_ihold(tp, ip);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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/* XXX(hch): ignoring the error here.. */
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error = xfs_trans_commit(tp, 0);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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xfs_log_force(mp, 0, log_flags);
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return 0;
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}
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int
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xfs_sync_fsdata(
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struct xfs_mount *mp,
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int flags)
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{
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struct xfs_buf *bp;
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struct xfs_buf_log_item *bip;
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int error = 0;
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/*
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* If this is xfssyncd() then only sync the superblock if we can
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* lock it without sleeping and it is not pinned.
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*/
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if (flags & SYNC_BDFLUSH) {
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ASSERT(!(flags & SYNC_WAIT));
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bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
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if (!bp)
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goto out;
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bip = XFS_BUF_FSPRIVATE(bp, struct xfs_buf_log_item *);
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if (!bip || !xfs_buf_item_dirty(bip) || XFS_BUF_ISPINNED(bp))
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goto out_brelse;
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} else {
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bp = xfs_getsb(mp, 0);
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/*
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* If the buffer is pinned then push on the log so we won't
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* get stuck waiting in the write for someone, maybe
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* ourselves, to flush the log.
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*
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* Even though we just pushed the log above, we did not have
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* the superblock buffer locked at that point so it can
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* become pinned in between there and here.
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*/
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if (XFS_BUF_ISPINNED(bp))
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xfs_log_force(mp, 0, XFS_LOG_FORCE);
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}
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if (flags & SYNC_WAIT)
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XFS_BUF_UNASYNC(bp);
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else
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XFS_BUF_ASYNC(bp);
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return xfs_bwrite(mp, bp);
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out_brelse:
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xfs_buf_relse(bp);
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out:
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return error;
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}
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/*
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* When remounting a filesystem read-only or freezing the filesystem, we have
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* two phases to execute. This first phase is syncing the data before we
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* quiesce the filesystem, and the second is flushing all the inodes out after
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* we've waited for all the transactions created by the first phase to
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* complete. The second phase ensures that the inodes are written to their
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* location on disk rather than just existing in transactions in the log. This
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* means after a quiesce there is no log replay required to write the inodes to
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* disk (this is the main difference between a sync and a quiesce).
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*/
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/*
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* First stage of freeze - no writers will make progress now we are here,
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* so we flush delwri and delalloc buffers here, then wait for all I/O to
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* complete. Data is frozen at that point. Metadata is not frozen,
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* transactions can still occur here so don't bother flushing the buftarg
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* because it'll just get dirty again.
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*/
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int
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xfs_quiesce_data(
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struct xfs_mount *mp)
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{
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int error;
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/* push non-blocking */
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xfs_sync_inodes(mp, SYNC_DELWRI|SYNC_BDFLUSH);
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XFS_QM_DQSYNC(mp, SYNC_BDFLUSH);
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xfs_filestream_flush(mp);
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/* push and block */
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xfs_sync_inodes(mp, SYNC_DELWRI|SYNC_WAIT|SYNC_IOWAIT);
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XFS_QM_DQSYNC(mp, SYNC_WAIT);
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/* write superblock and hoover up shutdown errors */
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error = xfs_sync_fsdata(mp, 0);
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/* flush data-only devices */
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if (mp->m_rtdev_targp)
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XFS_bflush(mp->m_rtdev_targp);
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return error;
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}
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STATIC void
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xfs_quiesce_fs(
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struct xfs_mount *mp)
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{
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int count = 0, pincount;
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xfs_flush_buftarg(mp->m_ddev_targp, 0);
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xfs_finish_reclaim_all(mp, 0, XFS_IFLUSH_DELWRI_ELSE_ASYNC);
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/*
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* This loop must run at least twice. The first instance of the loop
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* will flush most meta data but that will generate more meta data
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* (typically directory updates). Which then must be flushed and
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* logged before we can write the unmount record.
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*/
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do {
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xfs_sync_inodes(mp, SYNC_ATTR|SYNC_WAIT);
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pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
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if (!pincount) {
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delay(50);
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count++;
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}
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} while (count < 2);
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}
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/*
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* Second stage of a quiesce. The data is already synced, now we have to take
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* care of the metadata. New transactions are already blocked, so we need to
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* wait for any remaining transactions to drain out before proceding.
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*/
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void
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xfs_quiesce_attr(
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struct xfs_mount *mp)
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{
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int error = 0;
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/* wait for all modifications to complete */
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while (atomic_read(&mp->m_active_trans) > 0)
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delay(100);
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/* flush inodes and push all remaining buffers out to disk */
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xfs_quiesce_fs(mp);
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ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
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/* Push the superblock and write an unmount record */
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error = xfs_log_sbcount(mp, 1);
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if (error)
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xfs_fs_cmn_err(CE_WARN, mp,
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"xfs_attr_quiesce: failed to log sb changes. "
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"Frozen image may not be consistent.");
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xfs_log_unmount_write(mp);
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xfs_unmountfs_writesb(mp);
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}
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/*
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* Enqueue a work item to be picked up by the vfs xfssyncd thread.
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* Doing this has two advantages:
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* - It saves on stack space, which is tight in certain situations
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* - It can be used (with care) as a mechanism to avoid deadlocks.
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* Flushing while allocating in a full filesystem requires both.
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*/
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STATIC void
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xfs_syncd_queue_work(
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struct xfs_mount *mp,
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void *data,
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void (*syncer)(struct xfs_mount *, void *))
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{
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struct bhv_vfs_sync_work *work;
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work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP);
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INIT_LIST_HEAD(&work->w_list);
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work->w_syncer = syncer;
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work->w_data = data;
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work->w_mount = mp;
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spin_lock(&mp->m_sync_lock);
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list_add_tail(&work->w_list, &mp->m_sync_list);
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spin_unlock(&mp->m_sync_lock);
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wake_up_process(mp->m_sync_task);
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}
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/*
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* Flush delayed allocate data, attempting to free up reserved space
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* from existing allocations. At this point a new allocation attempt
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* has failed with ENOSPC and we are in the process of scratching our
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* heads, looking about for more room...
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*/
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STATIC void
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xfs_flush_inode_work(
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struct xfs_mount *mp,
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void *arg)
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{
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struct inode *inode = arg;
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filemap_flush(inode->i_mapping);
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iput(inode);
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}
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void
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xfs_flush_inode(
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xfs_inode_t *ip)
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{
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struct inode *inode = VFS_I(ip);
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igrab(inode);
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xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_inode_work);
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delay(msecs_to_jiffies(500));
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}
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/*
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* This is the "bigger hammer" version of xfs_flush_inode_work...
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* (IOW, "If at first you don't succeed, use a Bigger Hammer").
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*/
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STATIC void
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xfs_flush_device_work(
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struct xfs_mount *mp,
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void *arg)
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{
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struct inode *inode = arg;
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sync_blockdev(mp->m_super->s_bdev);
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iput(inode);
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}
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void
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xfs_flush_device(
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xfs_inode_t *ip)
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{
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struct inode *inode = VFS_I(ip);
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igrab(inode);
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xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_device_work);
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delay(msecs_to_jiffies(500));
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xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
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}
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/*
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* Every sync period we need to unpin all items, reclaim inodes, sync
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* quota and write out the superblock. We might need to cover the log
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* to indicate it is idle.
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*/
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STATIC void
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xfs_sync_worker(
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struct xfs_mount *mp,
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void *unused)
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{
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int error;
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if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
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xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
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xfs_finish_reclaim_all(mp, 1, XFS_IFLUSH_DELWRI_ELSE_ASYNC);
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/* dgc: errors ignored here */
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error = XFS_QM_DQSYNC(mp, SYNC_BDFLUSH);
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error = xfs_sync_fsdata(mp, SYNC_BDFLUSH);
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if (xfs_log_need_covered(mp))
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error = xfs_commit_dummy_trans(mp, XFS_LOG_FORCE);
|
|
}
|
|
mp->m_sync_seq++;
|
|
wake_up(&mp->m_wait_single_sync_task);
|
|
}
|
|
|
|
STATIC int
|
|
xfssyncd(
|
|
void *arg)
|
|
{
|
|
struct xfs_mount *mp = arg;
|
|
long timeleft;
|
|
bhv_vfs_sync_work_t *work, *n;
|
|
LIST_HEAD (tmp);
|
|
|
|
set_freezable();
|
|
timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
|
|
for (;;) {
|
|
timeleft = schedule_timeout_interruptible(timeleft);
|
|
/* swsusp */
|
|
try_to_freeze();
|
|
if (kthread_should_stop() && list_empty(&mp->m_sync_list))
|
|
break;
|
|
|
|
spin_lock(&mp->m_sync_lock);
|
|
/*
|
|
* We can get woken by laptop mode, to do a sync -
|
|
* that's the (only!) case where the list would be
|
|
* empty with time remaining.
|
|
*/
|
|
if (!timeleft || list_empty(&mp->m_sync_list)) {
|
|
if (!timeleft)
|
|
timeleft = xfs_syncd_centisecs *
|
|
msecs_to_jiffies(10);
|
|
INIT_LIST_HEAD(&mp->m_sync_work.w_list);
|
|
list_add_tail(&mp->m_sync_work.w_list,
|
|
&mp->m_sync_list);
|
|
}
|
|
list_for_each_entry_safe(work, n, &mp->m_sync_list, w_list)
|
|
list_move(&work->w_list, &tmp);
|
|
spin_unlock(&mp->m_sync_lock);
|
|
|
|
list_for_each_entry_safe(work, n, &tmp, w_list) {
|
|
(*work->w_syncer)(mp, work->w_data);
|
|
list_del(&work->w_list);
|
|
if (work == &mp->m_sync_work)
|
|
continue;
|
|
kmem_free(work);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_syncd_init(
|
|
struct xfs_mount *mp)
|
|
{
|
|
mp->m_sync_work.w_syncer = xfs_sync_worker;
|
|
mp->m_sync_work.w_mount = mp;
|
|
mp->m_sync_task = kthread_run(xfssyncd, mp, "xfssyncd");
|
|
if (IS_ERR(mp->m_sync_task))
|
|
return -PTR_ERR(mp->m_sync_task);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
xfs_syncd_stop(
|
|
struct xfs_mount *mp)
|
|
{
|
|
kthread_stop(mp->m_sync_task);
|
|
}
|
|
|