[XFS] move sync code to its own file (fe4fa4b8) · Commits · e / devices / android_kernel_xiaomi_markw

fs/xfs/Makefile

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Original line number	Diff line number	Diff line
		@@ -107,6 +107,7 @@ xfs-y += $(addprefix $(XFS_LINUX)/, \
		xfs_iops.o \
		xfs_lrw.o \
		xfs_super.o \
		xfs_sync.o \
		xfs_vnode.o \
		xfs_xattr.o)

fs/xfs/linux-2.6/xfs_super.c

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Original line number	Diff line number	Diff line
		@@ -59,6 +59,7 @@
		#include "xfs_extfree_item.h"
		#include "xfs_mru_cache.h"
		#include "xfs_inode_item.h"
		#include "xfs_sync.h"

		#include <linux/namei.h>
		#include <linux/init.h>

fs/xfs/linux-2.6/xfs_sync.c

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2000-2005 Silicon Graphics, Inc.
		* All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it would be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write the Free Software Foundation,
		* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
		*/
		#include "xfs.h"
		#include "xfs_fs.h"
		#include "xfs_types.h"
		#include "xfs_bit.h"
		#include "xfs_log.h"
		#include "xfs_inum.h"
		#include "xfs_trans.h"
		#include "xfs_sb.h"
		#include "xfs_ag.h"
		#include "xfs_dir2.h"
		#include "xfs_dmapi.h"
		#include "xfs_mount.h"
		#include "xfs_bmap_btree.h"
		#include "xfs_alloc_btree.h"
		#include "xfs_ialloc_btree.h"
		#include "xfs_btree.h"
		#include "xfs_dir2_sf.h"
		#include "xfs_attr_sf.h"
		#include "xfs_inode.h"
		#include "xfs_dinode.h"
		#include "xfs_error.h"
		#include "xfs_mru_cache.h"
		#include "xfs_filestream.h"
		#include "xfs_vnodeops.h"
		#include "xfs_utils.h"
		#include "xfs_buf_item.h"
		#include "xfs_inode_item.h"
		#include "xfs_rw.h"

		/*
		* 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);
		}

fs/xfs/linux-2.6/xfs_sync.h

0 → 100644

+7 −0

Original line number	Diff line number	Diff line
		#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

fs/xfs/xfs_vfsops.c

+1 −559

File changed.

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