[XFS] move sync code to its own file
The sync code in XFS is spread around several files. While it used to make sense to have such a distribution, the code is about to be cleaned up and so centralising it in one spot as the first step makes sense. SGI-PV: 988139 SGI-Modid: xfs-linux-melb:xfs-kern:32282a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
David Chinner
Lachlan McIlroy
Родитель
34519daae6
Коммит
fe4fa4b8e4
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@ -107,6 +107,7 @@ xfs-y += $(addprefix $(XFS_LINUX)/, \
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xfs_iops.o \
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xfs_lrw.o \
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xfs_super.o \
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xfs_sync.o \
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xfs_vnode.o \
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xfs_xattr.o)
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@ -59,6 +59,7 @@
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#include "xfs_extfree_item.h"
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#include "xfs_mru_cache.h"
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#include "xfs_inode_item.h"
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#include "xfs_sync.h"
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#include <linux/namei.h>
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#include <linux/init.h>
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@ -0,0 +1,605 @@
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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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* 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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/*
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* xfs_sync flushes any pending I/O to file system vfsp.
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*
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* This routine is called by vfs_sync() to make sure that things make it
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* out to disk eventually, on sync() system calls to flush out everything,
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* and when the file system is unmounted. For the vfs_sync() case, all
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* we really need to do is sync out the log to make all of our meta-data
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* updates permanent (except for timestamps). For calls from pflushd(),
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* dirty pages are kept moving by calling pdflush() on the inodes
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* containing them. We also flush the inodes that we can lock without
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* sleeping and the superblock if we can lock it without sleeping from
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* vfs_sync() so that items at the tail of the log are always moving out.
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*
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* Flags:
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* SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
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* to sleep if we can help it. All we really need
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* to do is ensure that the log is synced at least
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* periodically. We also push the inodes and
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* superblock if we can lock them without sleeping
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* and they are not pinned.
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* SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not
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* set, then we really want to lock each inode and flush
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* it.
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* SYNC_WAIT - All the flushes that take place in this call should
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* be synchronous.
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* SYNC_DELWRI - This tells us to push dirty pages associated with
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* inodes. SYNC_WAIT and SYNC_BDFLUSH are used to
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* determine if they should be flushed sync, async, or
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* delwri.
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* SYNC_CLOSE - This flag is passed when the system is being
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* unmounted. We should sync and invalidate everything.
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* SYNC_FSDATA - This indicates that the caller would like to make
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* sure the superblock is safe on disk. We can ensure
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* this by simply making sure the log gets flushed
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* if SYNC_BDFLUSH is set, and by actually writing it
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* out otherwise.
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* SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete
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* before we return (including direct I/O). Forms the drain
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* side of the write barrier needed to safely quiesce the
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* filesystem.
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*
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*/
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int
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xfs_sync(
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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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/*
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* Get the Quota Manager to flush the dquots.
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*
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* If XFS quota support is not enabled or this filesystem
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* instance does not use quotas XFS_QM_DQSYNC will always
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* return zero.
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*/
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error = XFS_QM_DQSYNC(mp, flags);
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if (error) {
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/*
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* If we got an IO error, we will be shutting down.
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* So, there's nothing more for us to do here.
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*/
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ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
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if (XFS_FORCED_SHUTDOWN(mp))
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return XFS_ERROR(error);
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}
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if (flags & SYNC_IOWAIT)
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xfs_filestream_flush(mp);
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return xfs_syncsub(mp, flags, NULL);
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}
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/*
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* xfs sync routine for internal use
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*
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* This routine supports all of the flags defined for the generic vfs_sync
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* interface as explained above under xfs_sync.
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*
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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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int *bypassed)
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{
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xfs_inode_t *ip = NULL;
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struct inode *vp = NULL;
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int error;
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int last_error;
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uint64_t fflag;
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uint lock_flags;
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uint base_lock_flags;
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boolean_t mount_locked;
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boolean_t vnode_refed;
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int preempt;
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xfs_iptr_t *ipointer;
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#ifdef DEBUG
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boolean_t ipointer_in = B_FALSE;
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#define IPOINTER_SET ipointer_in = B_TRUE
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#define IPOINTER_CLR ipointer_in = B_FALSE
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#else
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#define IPOINTER_SET
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#define IPOINTER_CLR
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#endif
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/* Insert a marker record into the inode list after inode ip. The list
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* must be locked when this is called. After the call the list will no
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* longer be locked.
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*/
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#define IPOINTER_INSERT(ip, mp) { \
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ASSERT(ipointer_in == B_FALSE); \
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ipointer->ip_mnext = ip->i_mnext; \
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ipointer->ip_mprev = ip; \
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ip->i_mnext = (xfs_inode_t *)ipointer; \
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ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
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preempt = 0; \
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XFS_MOUNT_IUNLOCK(mp); \
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mount_locked = B_FALSE; \
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IPOINTER_SET; \
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}
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/* Remove the marker from the inode list. If the marker was the only item
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* in the list then there are no remaining inodes and we should zero out
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* the whole list. If we are the current head of the list then move the head
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* past us.
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*/
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#define IPOINTER_REMOVE(ip, mp) { \
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ASSERT(ipointer_in == B_TRUE); \
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if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
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ip = ipointer->ip_mnext; \
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ip->i_mprev = ipointer->ip_mprev; \
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ipointer->ip_mprev->i_mnext = ip; \
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if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
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mp->m_inodes = ip; \
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} \
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} else { \
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ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
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mp->m_inodes = NULL; \
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ip = NULL; \
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} \
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IPOINTER_CLR; \
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}
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#define XFS_PREEMPT_MASK 0x7f
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ASSERT(!(flags & SYNC_BDFLUSH));
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if (bypassed)
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*bypassed = 0;
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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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preempt = 0;
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/* Allocate a reference marker */
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ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
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fflag = XFS_B_ASYNC; /* default is don't wait */
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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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base_lock_flags = XFS_ILOCK_SHARED;
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if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
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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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base_lock_flags |= XFS_IOLOCK_SHARED;
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}
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XFS_MOUNT_ILOCK(mp);
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ip = mp->m_inodes;
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mount_locked = B_TRUE;
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vnode_refed = B_FALSE;
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IPOINTER_CLR;
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do {
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ASSERT(ipointer_in == B_FALSE);
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ASSERT(vnode_refed == B_FALSE);
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lock_flags = base_lock_flags;
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/*
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* There were no inodes in the list, just break out
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* of the loop.
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*/
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if (ip == NULL) {
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break;
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}
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/*
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* We found another sync thread marker - skip it
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*/
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if (ip->i_mount == NULL) {
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ip = ip->i_mnext;
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continue;
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}
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vp = VFS_I(ip);
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/*
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* If the vnode is gone then this is being torn down,
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* call reclaim if it is flushed, else let regular flush
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* code deal with it later in the loop.
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*/
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if (vp == NULL) {
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/* Skip ones already in reclaim */
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if (ip->i_flags & XFS_IRECLAIM) {
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ip = ip->i_mnext;
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continue;
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}
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if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
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ip = ip->i_mnext;
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} else if ((xfs_ipincount(ip) == 0) &&
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xfs_iflock_nowait(ip)) {
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IPOINTER_INSERT(ip, mp);
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xfs_finish_reclaim(ip, 1,
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XFS_IFLUSH_DELWRI_ELSE_ASYNC);
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XFS_MOUNT_ILOCK(mp);
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mount_locked = B_TRUE;
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IPOINTER_REMOVE(ip, mp);
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} else {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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ip = ip->i_mnext;
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}
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continue;
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}
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if (VN_BAD(vp)) {
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ip = ip->i_mnext;
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continue;
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}
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if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
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XFS_MOUNT_IUNLOCK(mp);
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kmem_free(ipointer);
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return 0;
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}
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/*
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* Try to lock without sleeping. We're out of order with
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* the inode list lock here, so if we fail we need to drop
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* the mount lock and try again. If we're called from
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* bdflush() here, then don't bother.
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*
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* The inode lock here actually coordinates with the
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* almost spurious inode lock in xfs_ireclaim() to prevent
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* the vnode we handle here without a reference from
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* being freed while we reference it. If we lock the inode
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* while it's on the mount list here, then the spurious inode
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* lock in xfs_ireclaim() after the inode is pulled from
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* the mount list will sleep until we release it here.
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* This keeps the vnode from being freed while we reference
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* it.
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*/
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if (xfs_ilock_nowait(ip, lock_flags) == 0) {
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if (vp == NULL) {
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ip = ip->i_mnext;
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continue;
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}
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vp = vn_grab(vp);
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if (vp == NULL) {
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ip = ip->i_mnext;
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continue;
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}
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IPOINTER_INSERT(ip, mp);
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xfs_ilock(ip, lock_flags);
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ASSERT(vp == VFS_I(ip));
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ASSERT(ip->i_mount == mp);
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vnode_refed = B_TRUE;
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}
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/* From here on in the loop we may have a marker record
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* in the inode list.
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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_CLOSE|SYNC_IOWAIT)) ||
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((flags & SYNC_DELWRI) && VN_DIRTY(vp))) {
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if (mount_locked) {
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IPOINTER_INSERT(ip, mp);
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}
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (flags & SYNC_CLOSE) {
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/* Shutdown case. Flush and invalidate. */
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if (XFS_FORCED_SHUTDOWN(mp))
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xfs_tosspages(ip, 0, -1,
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FI_REMAPF);
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else
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error = xfs_flushinval_pages(ip,
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0, -1, FI_REMAPF);
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} else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
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error = xfs_flush_pages(ip, 0,
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-1, fflag, FI_NONE);
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}
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/*
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* When freezing, we need to wait ensure all I/O (including direct
|
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* I/O) is complete to ensure no further data modification can take
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* place after this point
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*/
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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) &&
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(ip->i_update_core ||
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(ip->i_itemp && ip->i_itemp->ili_format.ilf_fields))) {
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if (mount_locked)
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IPOINTER_INSERT(ip, mp);
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if (flags & SYNC_WAIT) {
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xfs_iflock(ip);
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error = xfs_iflush(ip, XFS_IFLUSH_SYNC);
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/*
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* If we can't acquire the flush lock, then the inode
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* is already being flushed so don't bother waiting.
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*
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* If we can lock it then do a delwri flush so we can
|
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* combine multiple inode flushes in each disk write.
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*/
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} else if (xfs_iflock_nowait(ip)) {
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error = xfs_iflush(ip, XFS_IFLUSH_DELWRI);
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} else if (bypassed) {
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(*bypassed)++;
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}
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}
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if (lock_flags != 0) {
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xfs_iunlock(ip, lock_flags);
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}
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if (vnode_refed) {
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/*
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* If we had to take a reference on the vnode
|
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* above, then wait until after we've unlocked
|
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* the inode to release the reference. This is
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||||
* because we can be already holding the inode
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* lock when IRELE() calls xfs_inactive().
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*
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* Make sure to drop the mount lock before calling
|
||||
* IRELE() so that we don't trip over ourselves if
|
||||
* we have to go for the mount lock again in the
|
||||
* inactive code.
|
||||
*/
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if (mount_locked) {
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IPOINTER_INSERT(ip, mp);
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}
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||||
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IRELE(ip);
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vnode_refed = B_FALSE;
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||||
}
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||||
|
||||
if (error) {
|
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last_error = error;
|
||||
}
|
||||
|
||||
/*
|
||||
* bail out if the filesystem is corrupted.
|
||||
*/
|
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if (error == EFSCORRUPTED) {
|
||||
if (!mount_locked) {
|
||||
XFS_MOUNT_ILOCK(mp);
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IPOINTER_REMOVE(ip, mp);
|
||||
}
|
||||
XFS_MOUNT_IUNLOCK(mp);
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||||
ASSERT(ipointer_in == B_FALSE);
|
||||
kmem_free(ipointer);
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return XFS_ERROR(error);
|
||||
}
|
||||
|
||||
/* Let other threads have a chance at the mount lock
|
||||
* if we have looped many times without dropping the
|
||||
* lock.
|
||||
*/
|
||||
if ((++preempt & XFS_PREEMPT_MASK) == 0) {
|
||||
if (mount_locked) {
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
}
|
||||
}
|
||||
|
||||
if (mount_locked == B_FALSE) {
|
||||
XFS_MOUNT_ILOCK(mp);
|
||||
mount_locked = B_TRUE;
|
||||
IPOINTER_REMOVE(ip, mp);
|
||||
continue;
|
||||
}
|
||||
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
ip = ip->i_mnext;
|
||||
|
||||
} while (ip != mp->m_inodes);
|
||||
|
||||
XFS_MOUNT_IUNLOCK(mp);
|
||||
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
|
||||
kmem_free(ipointer);
|
||||
return XFS_ERROR(last_error);
|
||||
}
|
||||
|
||||
/*
|
||||
* xfs sync routine for internal use
|
||||
*
|
||||
* This routine supports all of the flags defined for the generic vfs_sync
|
||||
* interface as explained above under xfs_sync.
|
||||
*
|
||||
*/
|
||||
int
|
||||
xfs_syncsub(
|
||||
xfs_mount_t *mp,
|
||||
int flags,
|
||||
int *bypassed)
|
||||
{
|
||||
int error = 0;
|
||||
int last_error = 0;
|
||||
uint log_flags = XFS_LOG_FORCE;
|
||||
xfs_buf_t *bp;
|
||||
xfs_buf_log_item_t *bip;
|
||||
|
||||
/*
|
||||
* Sync out the log. This ensures that the log is periodically
|
||||
* flushed even if there is not enough activity to fill it up.
|
||||
*/
|
||||
if (flags & SYNC_WAIT)
|
||||
log_flags |= XFS_LOG_SYNC;
|
||||
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
|
||||
if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
|
||||
if (flags & SYNC_BDFLUSH)
|
||||
xfs_finish_reclaim_all(mp, 1);
|
||||
else
|
||||
error = xfs_sync_inodes(mp, flags, bypassed);
|
||||
}
|
||||
|
||||
/*
|
||||
* Flushing out dirty data above probably generated more
|
||||
* log activity, so if this isn't vfs_sync() then flush
|
||||
* the log again.
|
||||
*/
|
||||
if (flags & SYNC_DELWRI) {
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
}
|
||||
|
||||
if (flags & SYNC_FSDATA) {
|
||||
/*
|
||||
* If this is vfs_sync() then only sync the superblock
|
||||
* if we can lock it without sleeping and it is not pinned.
|
||||
*/
|
||||
if (flags & SYNC_BDFLUSH) {
|
||||
bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
|
||||
if (bp != NULL) {
|
||||
bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
|
||||
if ((bip != NULL) &&
|
||||
xfs_buf_item_dirty(bip)) {
|
||||
if (!(XFS_BUF_ISPINNED(bp))) {
|
||||
XFS_BUF_ASYNC(bp);
|
||||
error = xfs_bwrite(mp, bp);
|
||||
} else {
|
||||
xfs_buf_relse(bp);
|
||||
}
|
||||
} else {
|
||||
xfs_buf_relse(bp);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
bp = xfs_getsb(mp, 0);
|
||||
/*
|
||||
* If the buffer is pinned then push on the log so
|
||||
* we won't get stuck waiting in the write for
|
||||
* someone, maybe ourselves, to flush the log.
|
||||
* Even though we just pushed the log above, we
|
||||
* did not have the superblock buffer locked at
|
||||
* that point so it can become pinned in between
|
||||
* there and here.
|
||||
*/
|
||||
if (XFS_BUF_ISPINNED(bp))
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
|
||||
if (flags & SYNC_WAIT)
|
||||
XFS_BUF_UNASYNC(bp);
|
||||
else
|
||||
XFS_BUF_ASYNC(bp);
|
||||
error = xfs_bwrite(mp, bp);
|
||||
}
|
||||
if (error) {
|
||||
last_error = error;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Now check to see if the log needs a "dummy" transaction.
|
||||
*/
|
||||
if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
|
||||
xfs_trans_t *tp;
|
||||
xfs_inode_t *ip;
|
||||
|
||||
/*
|
||||
* Put a dummy transaction in the log to tell
|
||||
* recovery that all others are OK.
|
||||
*/
|
||||
tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
|
||||
if ((error = xfs_trans_reserve(tp, 0,
|
||||
XFS_ICHANGE_LOG_RES(mp),
|
||||
0, 0, 0))) {
|
||||
xfs_trans_cancel(tp, 0);
|
||||
return error;
|
||||
}
|
||||
|
||||
ip = mp->m_rootip;
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
||||
xfs_trans_ihold(tp, ip);
|
||||
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
||||
error = xfs_trans_commit(tp, 0);
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
}
|
||||
|
||||
/*
|
||||
* When shutting down, we need to insure that the AIL is pushed
|
||||
* to disk or the filesystem can appear corrupt from the PROM.
|
||||
*/
|
||||
if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
|
||||
XFS_bflush(mp->m_ddev_targp);
|
||||
if (mp->m_rtdev_targp) {
|
||||
XFS_bflush(mp->m_rtdev_targp);
|
||||
}
|
||||
}
|
||||
|
||||
return XFS_ERROR(last_error);
|
||||
}
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
#ifndef XFS_SYNC_H
|
||||
#define XFS_SYNC_H 1
|
||||
|
||||
int xfs_sync(struct xfs_mount *mp, int flags);
|
||||
int xfs_syncsub(struct xfs_mount *mp, int flags, int *bypassed);
|
||||
|
||||
#endif
|
||||
|
|
@ -56,6 +56,7 @@
|
|||
#include "xfs_vnodeops.h"
|
||||
#include "xfs_vfsops.h"
|
||||
#include "xfs_utils.h"
|
||||
#include "xfs_sync.h"
|
||||
|
||||
|
||||
STATIC void
|
||||
|
|
@ -196,562 +197,3 @@ fscorrupt_out2:
|
|||
return XFS_ERROR(EFSCORRUPTED);
|
||||
}
|
||||
|
||||
/*
|
||||
* xfs_sync flushes any pending I/O to file system vfsp.
|
||||
*
|
||||
* This routine is called by vfs_sync() to make sure that things make it
|
||||
* out to disk eventually, on sync() system calls to flush out everything,
|
||||
* and when the file system is unmounted. For the vfs_sync() case, all
|
||||
* we really need to do is sync out the log to make all of our meta-data
|
||||
* updates permanent (except for timestamps). For calls from pflushd(),
|
||||
* dirty pages are kept moving by calling pdflush() on the inodes
|
||||
* containing them. We also flush the inodes that we can lock without
|
||||
* sleeping and the superblock if we can lock it without sleeping from
|
||||
* vfs_sync() so that items at the tail of the log are always moving out.
|
||||
*
|
||||
* Flags:
|
||||
* SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
|
||||
* to sleep if we can help it. All we really need
|
||||
* to do is ensure that the log is synced at least
|
||||
* periodically. We also push the inodes and
|
||||
* superblock if we can lock them without sleeping
|
||||
* and they are not pinned.
|
||||
* SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not
|
||||
* set, then we really want to lock each inode and flush
|
||||
* it.
|
||||
* SYNC_WAIT - All the flushes that take place in this call should
|
||||
* be synchronous.
|
||||
* SYNC_DELWRI - This tells us to push dirty pages associated with
|
||||
* inodes. SYNC_WAIT and SYNC_BDFLUSH are used to
|
||||
* determine if they should be flushed sync, async, or
|
||||
* delwri.
|
||||
* SYNC_CLOSE - This flag is passed when the system is being
|
||||
* unmounted. We should sync and invalidate everything.
|
||||
* SYNC_FSDATA - This indicates that the caller would like to make
|
||||
* sure the superblock is safe on disk. We can ensure
|
||||
* this by simply making sure the log gets flushed
|
||||
* if SYNC_BDFLUSH is set, and by actually writing it
|
||||
* out otherwise.
|
||||
* SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete
|
||||
* before we return (including direct I/O). Forms the drain
|
||||
* side of the write barrier needed to safely quiesce the
|
||||
* filesystem.
|
||||
*
|
||||
*/
|
||||
int
|
||||
xfs_sync(
|
||||
xfs_mount_t *mp,
|
||||
int flags)
|
||||
{
|
||||
int error;
|
||||
|
||||
/*
|
||||
* Get the Quota Manager to flush the dquots.
|
||||
*
|
||||
* If XFS quota support is not enabled or this filesystem
|
||||
* instance does not use quotas XFS_QM_DQSYNC will always
|
||||
* return zero.
|
||||
*/
|
||||
error = XFS_QM_DQSYNC(mp, flags);
|
||||
if (error) {
|
||||
/*
|
||||
* If we got an IO error, we will be shutting down.
|
||||
* So, there's nothing more for us to do here.
|
||||
*/
|
||||
ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
return XFS_ERROR(error);
|
||||
}
|
||||
|
||||
if (flags & SYNC_IOWAIT)
|
||||
xfs_filestream_flush(mp);
|
||||
|
||||
return xfs_syncsub(mp, flags, NULL);
|
||||
}
|
||||
|
||||
/*
|
||||
* xfs sync routine for internal use
|
||||
*
|
||||
* This routine supports all of the flags defined for the generic vfs_sync
|
||||
* interface as explained above under xfs_sync.
|
||||
*
|
||||
*/
|
||||
int
|
||||
xfs_sync_inodes(
|
||||
xfs_mount_t *mp,
|
||||
int flags,
|
||||
int *bypassed)
|
||||
{
|
||||
xfs_inode_t *ip = NULL;
|
||||
struct inode *vp = NULL;
|
||||
int error;
|
||||
int last_error;
|
||||
uint64_t fflag;
|
||||
uint lock_flags;
|
||||
uint base_lock_flags;
|
||||
boolean_t mount_locked;
|
||||
boolean_t vnode_refed;
|
||||
int preempt;
|
||||
xfs_iptr_t *ipointer;
|
||||
#ifdef DEBUG
|
||||
boolean_t ipointer_in = B_FALSE;
|
||||
|
||||
#define IPOINTER_SET ipointer_in = B_TRUE
|
||||
#define IPOINTER_CLR ipointer_in = B_FALSE
|
||||
#else
|
||||
#define IPOINTER_SET
|
||||
#define IPOINTER_CLR
|
||||
#endif
|
||||
|
||||
|
||||
/* Insert a marker record into the inode list after inode ip. The list
|
||||
* must be locked when this is called. After the call the list will no
|
||||
* longer be locked.
|
||||
*/
|
||||
#define IPOINTER_INSERT(ip, mp) { \
|
||||
ASSERT(ipointer_in == B_FALSE); \
|
||||
ipointer->ip_mnext = ip->i_mnext; \
|
||||
ipointer->ip_mprev = ip; \
|
||||
ip->i_mnext = (xfs_inode_t *)ipointer; \
|
||||
ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
|
||||
preempt = 0; \
|
||||
XFS_MOUNT_IUNLOCK(mp); \
|
||||
mount_locked = B_FALSE; \
|
||||
IPOINTER_SET; \
|
||||
}
|
||||
|
||||
/* Remove the marker from the inode list. If the marker was the only item
|
||||
* in the list then there are no remaining inodes and we should zero out
|
||||
* the whole list. If we are the current head of the list then move the head
|
||||
* past us.
|
||||
*/
|
||||
#define IPOINTER_REMOVE(ip, mp) { \
|
||||
ASSERT(ipointer_in == B_TRUE); \
|
||||
if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
|
||||
ip = ipointer->ip_mnext; \
|
||||
ip->i_mprev = ipointer->ip_mprev; \
|
||||
ipointer->ip_mprev->i_mnext = ip; \
|
||||
if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
|
||||
mp->m_inodes = ip; \
|
||||
} \
|
||||
} else { \
|
||||
ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
|
||||
mp->m_inodes = NULL; \
|
||||
ip = NULL; \
|
||||
} \
|
||||
IPOINTER_CLR; \
|
||||
}
|
||||
|
||||
#define XFS_PREEMPT_MASK 0x7f
|
||||
|
||||
ASSERT(!(flags & SYNC_BDFLUSH));
|
||||
|
||||
if (bypassed)
|
||||
*bypassed = 0;
|
||||
if (mp->m_flags & XFS_MOUNT_RDONLY)
|
||||
return 0;
|
||||
error = 0;
|
||||
last_error = 0;
|
||||
preempt = 0;
|
||||
|
||||
/* Allocate a reference marker */
|
||||
ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
|
||||
|
||||
fflag = XFS_B_ASYNC; /* default is don't wait */
|
||||
if (flags & SYNC_DELWRI)
|
||||
fflag = XFS_B_DELWRI;
|
||||
if (flags & SYNC_WAIT)
|
||||
fflag = 0; /* synchronous overrides all */
|
||||
|
||||
base_lock_flags = XFS_ILOCK_SHARED;
|
||||
if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
|
||||
/*
|
||||
* We need the I/O lock if we're going to call any of
|
||||
* the flush/inval routines.
|
||||
*/
|
||||
base_lock_flags |= XFS_IOLOCK_SHARED;
|
||||
}
|
||||
|
||||
XFS_MOUNT_ILOCK(mp);
|
||||
|
||||
ip = mp->m_inodes;
|
||||
|
||||
mount_locked = B_TRUE;
|
||||
vnode_refed = B_FALSE;
|
||||
|
||||
IPOINTER_CLR;
|
||||
|
||||
do {
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
ASSERT(vnode_refed == B_FALSE);
|
||||
|
||||
lock_flags = base_lock_flags;
|
||||
|
||||
/*
|
||||
* There were no inodes in the list, just break out
|
||||
* of the loop.
|
||||
*/
|
||||
if (ip == NULL) {
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* We found another sync thread marker - skip it
|
||||
*/
|
||||
if (ip->i_mount == NULL) {
|
||||
ip = ip->i_mnext;
|
||||
continue;
|
||||
}
|
||||
|
||||
vp = VFS_I(ip);
|
||||
|
||||
/*
|
||||
* If the vnode is gone then this is being torn down,
|
||||
* call reclaim if it is flushed, else let regular flush
|
||||
* code deal with it later in the loop.
|
||||
*/
|
||||
|
||||
if (vp == NULL) {
|
||||
/* Skip ones already in reclaim */
|
||||
if (ip->i_flags & XFS_IRECLAIM) {
|
||||
ip = ip->i_mnext;
|
||||
continue;
|
||||
}
|
||||
if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
|
||||
ip = ip->i_mnext;
|
||||
} else if ((xfs_ipincount(ip) == 0) &&
|
||||
xfs_iflock_nowait(ip)) {
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
|
||||
xfs_finish_reclaim(ip, 1,
|
||||
XFS_IFLUSH_DELWRI_ELSE_ASYNC);
|
||||
|
||||
XFS_MOUNT_ILOCK(mp);
|
||||
mount_locked = B_TRUE;
|
||||
IPOINTER_REMOVE(ip, mp);
|
||||
} else {
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
ip = ip->i_mnext;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
if (VN_BAD(vp)) {
|
||||
ip = ip->i_mnext;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
|
||||
XFS_MOUNT_IUNLOCK(mp);
|
||||
kmem_free(ipointer);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to lock without sleeping. We're out of order with
|
||||
* the inode list lock here, so if we fail we need to drop
|
||||
* the mount lock and try again. If we're called from
|
||||
* bdflush() here, then don't bother.
|
||||
*
|
||||
* The inode lock here actually coordinates with the
|
||||
* almost spurious inode lock in xfs_ireclaim() to prevent
|
||||
* the vnode we handle here without a reference from
|
||||
* being freed while we reference it. If we lock the inode
|
||||
* while it's on the mount list here, then the spurious inode
|
||||
* lock in xfs_ireclaim() after the inode is pulled from
|
||||
* the mount list will sleep until we release it here.
|
||||
* This keeps the vnode from being freed while we reference
|
||||
* it.
|
||||
*/
|
||||
if (xfs_ilock_nowait(ip, lock_flags) == 0) {
|
||||
if (vp == NULL) {
|
||||
ip = ip->i_mnext;
|
||||
continue;
|
||||
}
|
||||
|
||||
vp = vn_grab(vp);
|
||||
if (vp == NULL) {
|
||||
ip = ip->i_mnext;
|
||||
continue;
|
||||
}
|
||||
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
xfs_ilock(ip, lock_flags);
|
||||
|
||||
ASSERT(vp == VFS_I(ip));
|
||||
ASSERT(ip->i_mount == mp);
|
||||
|
||||
vnode_refed = B_TRUE;
|
||||
}
|
||||
|
||||
/* From here on in the loop we may have a marker record
|
||||
* in the inode list.
|
||||
*/
|
||||
|
||||
/*
|
||||
* If we have to flush data or wait for I/O completion
|
||||
* we need to drop the ilock that we currently hold.
|
||||
* If we need to drop the lock, insert a marker if we
|
||||
* have not already done so.
|
||||
*/
|
||||
if ((flags & (SYNC_CLOSE|SYNC_IOWAIT)) ||
|
||||
((flags & SYNC_DELWRI) && VN_DIRTY(vp))) {
|
||||
if (mount_locked) {
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
}
|
||||
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
||||
|
||||
if (flags & SYNC_CLOSE) {
|
||||
/* Shutdown case. Flush and invalidate. */
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
xfs_tosspages(ip, 0, -1,
|
||||
FI_REMAPF);
|
||||
else
|
||||
error = xfs_flushinval_pages(ip,
|
||||
0, -1, FI_REMAPF);
|
||||
} else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
|
||||
error = xfs_flush_pages(ip, 0,
|
||||
-1, fflag, FI_NONE);
|
||||
}
|
||||
|
||||
/*
|
||||
* When freezing, we need to wait ensure all I/O (including direct
|
||||
* I/O) is complete to ensure no further data modification can take
|
||||
* place after this point
|
||||
*/
|
||||
if (flags & SYNC_IOWAIT)
|
||||
vn_iowait(ip);
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
||||
}
|
||||
|
||||
if ((flags & SYNC_ATTR) &&
|
||||
(ip->i_update_core ||
|
||||
(ip->i_itemp && ip->i_itemp->ili_format.ilf_fields))) {
|
||||
if (mount_locked)
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
|
||||
if (flags & SYNC_WAIT) {
|
||||
xfs_iflock(ip);
|
||||
error = xfs_iflush(ip, XFS_IFLUSH_SYNC);
|
||||
|
||||
/*
|
||||
* If we can't acquire the flush lock, then the inode
|
||||
* is already being flushed so don't bother waiting.
|
||||
*
|
||||
* If we can lock it then do a delwri flush so we can
|
||||
* combine multiple inode flushes in each disk write.
|
||||
*/
|
||||
} else if (xfs_iflock_nowait(ip)) {
|
||||
error = xfs_iflush(ip, XFS_IFLUSH_DELWRI);
|
||||
} else if (bypassed) {
|
||||
(*bypassed)++;
|
||||
}
|
||||
}
|
||||
|
||||
if (lock_flags != 0) {
|
||||
xfs_iunlock(ip, lock_flags);
|
||||
}
|
||||
|
||||
if (vnode_refed) {
|
||||
/*
|
||||
* If we had to take a reference on the vnode
|
||||
* above, then wait until after we've unlocked
|
||||
* the inode to release the reference. This is
|
||||
* because we can be already holding the inode
|
||||
* lock when IRELE() calls xfs_inactive().
|
||||
*
|
||||
* Make sure to drop the mount lock before calling
|
||||
* IRELE() so that we don't trip over ourselves if
|
||||
* we have to go for the mount lock again in the
|
||||
* inactive code.
|
||||
*/
|
||||
if (mount_locked) {
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
}
|
||||
|
||||
IRELE(ip);
|
||||
|
||||
vnode_refed = B_FALSE;
|
||||
}
|
||||
|
||||
if (error) {
|
||||
last_error = error;
|
||||
}
|
||||
|
||||
/*
|
||||
* bail out if the filesystem is corrupted.
|
||||
*/
|
||||
if (error == EFSCORRUPTED) {
|
||||
if (!mount_locked) {
|
||||
XFS_MOUNT_ILOCK(mp);
|
||||
IPOINTER_REMOVE(ip, mp);
|
||||
}
|
||||
XFS_MOUNT_IUNLOCK(mp);
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
kmem_free(ipointer);
|
||||
return XFS_ERROR(error);
|
||||
}
|
||||
|
||||
/* Let other threads have a chance at the mount lock
|
||||
* if we have looped many times without dropping the
|
||||
* lock.
|
||||
*/
|
||||
if ((++preempt & XFS_PREEMPT_MASK) == 0) {
|
||||
if (mount_locked) {
|
||||
IPOINTER_INSERT(ip, mp);
|
||||
}
|
||||
}
|
||||
|
||||
if (mount_locked == B_FALSE) {
|
||||
XFS_MOUNT_ILOCK(mp);
|
||||
mount_locked = B_TRUE;
|
||||
IPOINTER_REMOVE(ip, mp);
|
||||
continue;
|
||||
}
|
||||
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
ip = ip->i_mnext;
|
||||
|
||||
} while (ip != mp->m_inodes);
|
||||
|
||||
XFS_MOUNT_IUNLOCK(mp);
|
||||
|
||||
ASSERT(ipointer_in == B_FALSE);
|
||||
|
||||
kmem_free(ipointer);
|
||||
return XFS_ERROR(last_error);
|
||||
}
|
||||
|
||||
/*
|
||||
* xfs sync routine for internal use
|
||||
*
|
||||
* This routine supports all of the flags defined for the generic vfs_sync
|
||||
* interface as explained above under xfs_sync.
|
||||
*
|
||||
*/
|
||||
int
|
||||
xfs_syncsub(
|
||||
xfs_mount_t *mp,
|
||||
int flags,
|
||||
int *bypassed)
|
||||
{
|
||||
int error = 0;
|
||||
int last_error = 0;
|
||||
uint log_flags = XFS_LOG_FORCE;
|
||||
xfs_buf_t *bp;
|
||||
xfs_buf_log_item_t *bip;
|
||||
|
||||
/*
|
||||
* Sync out the log. This ensures that the log is periodically
|
||||
* flushed even if there is not enough activity to fill it up.
|
||||
*/
|
||||
if (flags & SYNC_WAIT)
|
||||
log_flags |= XFS_LOG_SYNC;
|
||||
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
|
||||
if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
|
||||
if (flags & SYNC_BDFLUSH)
|
||||
xfs_finish_reclaim_all(mp, 1);
|
||||
else
|
||||
error = xfs_sync_inodes(mp, flags, bypassed);
|
||||
}
|
||||
|
||||
/*
|
||||
* Flushing out dirty data above probably generated more
|
||||
* log activity, so if this isn't vfs_sync() then flush
|
||||
* the log again.
|
||||
*/
|
||||
if (flags & SYNC_DELWRI) {
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
}
|
||||
|
||||
if (flags & SYNC_FSDATA) {
|
||||
/*
|
||||
* If this is vfs_sync() then only sync the superblock
|
||||
* if we can lock it without sleeping and it is not pinned.
|
||||
*/
|
||||
if (flags & SYNC_BDFLUSH) {
|
||||
bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
|
||||
if (bp != NULL) {
|
||||
bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
|
||||
if ((bip != NULL) &&
|
||||
xfs_buf_item_dirty(bip)) {
|
||||
if (!(XFS_BUF_ISPINNED(bp))) {
|
||||
XFS_BUF_ASYNC(bp);
|
||||
error = xfs_bwrite(mp, bp);
|
||||
} else {
|
||||
xfs_buf_relse(bp);
|
||||
}
|
||||
} else {
|
||||
xfs_buf_relse(bp);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
bp = xfs_getsb(mp, 0);
|
||||
/*
|
||||
* If the buffer is pinned then push on the log so
|
||||
* we won't get stuck waiting in the write for
|
||||
* someone, maybe ourselves, to flush the log.
|
||||
* Even though we just pushed the log above, we
|
||||
* did not have the superblock buffer locked at
|
||||
* that point so it can become pinned in between
|
||||
* there and here.
|
||||
*/
|
||||
if (XFS_BUF_ISPINNED(bp))
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
|
||||
if (flags & SYNC_WAIT)
|
||||
XFS_BUF_UNASYNC(bp);
|
||||
else
|
||||
XFS_BUF_ASYNC(bp);
|
||||
error = xfs_bwrite(mp, bp);
|
||||
}
|
||||
if (error) {
|
||||
last_error = error;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Now check to see if the log needs a "dummy" transaction.
|
||||
*/
|
||||
if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
|
||||
xfs_trans_t *tp;
|
||||
xfs_inode_t *ip;
|
||||
|
||||
/*
|
||||
* Put a dummy transaction in the log to tell
|
||||
* recovery that all others are OK.
|
||||
*/
|
||||
tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
|
||||
if ((error = xfs_trans_reserve(tp, 0,
|
||||
XFS_ICHANGE_LOG_RES(mp),
|
||||
0, 0, 0))) {
|
||||
xfs_trans_cancel(tp, 0);
|
||||
return error;
|
||||
}
|
||||
|
||||
ip = mp->m_rootip;
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
||||
xfs_trans_ihold(tp, ip);
|
||||
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
||||
error = xfs_trans_commit(tp, 0);
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
|
||||
}
|
||||
|
||||
/*
|
||||
* When shutting down, we need to insure that the AIL is pushed
|
||||
* to disk or the filesystem can appear corrupt from the PROM.
|
||||
*/
|
||||
if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
|
||||
XFS_bflush(mp->m_ddev_targp);
|
||||
if (mp->m_rtdev_targp) {
|
||||
XFS_bflush(mp->m_rtdev_targp);
|
||||
}
|
||||
}
|
||||
|
||||
return XFS_ERROR(last_error);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -8,7 +8,6 @@ struct kstatfs;
|
|||
struct xfs_mount;
|
||||
struct xfs_mount_args;
|
||||
|
||||
int xfs_sync(struct xfs_mount *mp, int flags);
|
||||
void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
|
||||
int lnnum);
|
||||
void xfs_attr_quiesce(struct xfs_mount *mp);
|
||||
|
|
|
|||
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