[XFS] Use the inode tree for finding dirty inodes (683a8970) · Commits · e / devices / android_kernel_xiaomi_markw

fs/xfs/linux-2.6/xfs_sync.c

+101 −260

Original line number	Diff line number	Diff line
		@@ -121,356 +121,197 @@ xfs_sync(
		}

		/*
		* 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.
		*
		* Sync all the inodes in the given AG according to the
		* direction given by the flags.
		*/
		int
		xfs_sync_inodes(
		STATIC int
		xfs_sync_inodes_ag(
		xfs_mount_t *mp,
		int ag,
		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);
		xfs_perag_t *pag = &mp->m_perag[ag];
		boolean_t vnode_refed = B_FALSE;
		int nr_found;
		int first_index = 0;
		int error = 0;
		int last_error = 0;
		int fflag = XFS_B_ASYNC;
		int lock_flags = XFS_ILOCK_SHARED;

		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;
		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.
		* use a gang lookup to find the next inode in the tree
		* as the tree is sparse and a gang lookup walks to find
		* the number of objects requested.
		*/
		if (ip == NULL) {
		break;
		}
		read_lock(&pag->pag_ici_lock);
		nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
		(void**)&ip, first_index, 1);

		/*
		* We found another sync thread marker - skip it
		*/
		if (ip->i_mount == NULL) {
		ip = ip->i_mnext;
		continue;
		if (!nr_found) {
		read_unlock(&pag->pag_ici_lock);
		break;
		}

		vp = VFS_I(ip);
		/* update the index for the next lookup */
		first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);

		/*
		* 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.
		* skip inodes in reclaim. Let xfs_syncsub do that for
		* us so we don't need to worry.
		*/

		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;
		}
		vp = VFS_I(ip);
		if (!vp) {
		read_unlock(&pag->pag_ici_lock);
		continue;
		}

		/* bad inodes are dealt with elsewhere */
		if (VN_BAD(vp)) {
		ip = ip->i_mnext;
		read_unlock(&pag->pag_ici_lock);
		continue;
		}

		/* nothing to sync during shutdown */
		if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
		XFS_MOUNT_IUNLOCK(mp);
		kmem_free(ipointer);
		read_unlock(&pag->pag_ici_lock);
		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.
		* 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;
		read_unlock(&pag->pag_ici_lock);
		if (!vp)
		continue;
		}

		IPOINTER_INSERT(ip, mp);
		xfs_ilock(ip, lock_flags);

		ASSERT(vp == VFS_I(ip));
		ASSERT(ip->i_mount == mp);

		vnode_refed = B_TRUE;
		} else {
		/* safe to unlock here as we have a reference */
		read_unlock(&pag->pag_ici_lock);
		}

		/* 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. */
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		if (XFS_FORCED_SHUTDOWN(mp))
		xfs_tosspages(ip, 0, -1,
		FI_REMAPF);
		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
		*/
		error = xfs_flushinval_pages(ip, 0, -1,
		FI_REMAPF);
		/* wait for I/O on freeze */
		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_DELWRI) && VN_DIRTY(vp)) {
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		error = xfs_flush_pages(ip, 0, -1, fflag, FI_NONE);
		if (flags & SYNC_IOWAIT)
		vn_iowait(ip);
		xfs_ilock(ip, XFS_ILOCK_SHARED);
		}

		if ((flags & SYNC_ATTR) && !xfs_inode_clean(ip)) {
		if (flags & SYNC_WAIT) {
		xfs_iflock(ip);
		if (!xfs_inode_clean(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
		xfs_ifunlock(ip);
		} else if (xfs_iflock_nowait(ip)) {
		if (!xfs_inode_clean(ip))
		error = xfs_iflush(ip, XFS_IFLUSH_DELWRI);
		else
		xfs_ifunlock(ip);
		} else if (bypassed) {
		(*bypassed)++;
		}
		}

		if (lock_flags != 0) {
		if (lock_flags)
		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) {
		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);
		if (error == EFSCORRUPTED)
		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);
		}
		}
		} while (nr_found);

		if (mount_locked == B_FALSE) {
		XFS_MOUNT_ILOCK(mp);
		mount_locked = B_TRUE;
		IPOINTER_REMOVE(ip, mp);
		continue;
		return last_error;
		}

		ASSERT(ipointer_in == B_FALSE);
		ip = ip->i_mnext;

		} while (ip != mp->m_inodes);

		XFS_MOUNT_IUNLOCK(mp);
		int
		xfs_sync_inodes(
		xfs_mount_t *mp,
		int flags,
		int *bypassed)
		{
		int error;
		int last_error;
		int i;

		ASSERT(ipointer_in == B_FALSE);
		if (bypassed)
		*bypassed = 0;
		if (mp->m_flags & XFS_MOUNT_RDONLY)
		return 0;
		error = 0;
		last_error = 0;

		kmem_free(ipointer);
		for (i = 0; i < mp->m_sb.sb_agcount; i++) {
		if (!mp->m_perag[i].pag_ici_init)
		continue;
		error = xfs_sync_inodes_ag(mp, i, flags, bypassed);
		if (error)
		last_error = error;
		if (error == EFSCORRUPTED)
		break;
		}
		return XFS_ERROR(last_error);
		}