Commit 664ffb8a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Darrick J. Wong
Browse files

xfs: move the buffer retry logic to xfs_buf.c 



Move the buffer retry state machine logic to xfs_buf.c and call it once
from xfs_ioend instead of duplicating it three times for the three kinds
of buffers.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
parent 23fb5a93

fs/xfs/libxfs/xfs_trans_inode.c

+3 −3
Original line number Diff line number Diff line
@@ -177,9 +177,9 @@ xfs_trans_log_inode( 


	/*

	 * Always OR in the bits from the ili_last_fields field.  This is to

	 * coordinate with the xfs_iflush() and xfs_iflush_done() routines in

	 * the eventual clearing of the ili_fields bits.  See the big comment in

	 * xfs_iflush() for an explanation of this coordination mechanism.

	 * coordinate with the xfs_iflush() and xfs_buf_inode_iodone() routines

	 * in the eventual clearing of the ili_fields bits.  See the big comment

	 * in xfs_iflush() for an explanation of this coordination mechanism.

	 */

	iip->ili_fields |= (flags | iip->ili_last_fields | iversion_flags);

	spin_unlock(&iip->ili_lock);

fs/xfs/xfs_buf.c

+170 −3
Original line number Diff line number Diff line
@@ -1171,8 +1171,145 @@ xfs_buf_wait_unpin( 
}



/*

 *	Buffer Utility Routines

 * Decide if we're going to retry the write after a failure, and prepare

 * the buffer for retrying the write.

 */

static bool

xfs_buf_ioerror_fail_without_retry(

	struct xfs_buf		*bp)

{

	struct xfs_mount	*mp = bp->b_mount;

	static unsigned long	lasttime;

	static struct xfs_buftarg *lasttarg;



	/*

	 * If we've already decided to shutdown the filesystem because of

	 * I/O errors, there's no point in giving this a retry.

	 */

	if (XFS_FORCED_SHUTDOWN(mp))

		return true;



	if (bp->b_target != lasttarg ||

	    time_after(jiffies, (lasttime + 5*HZ))) {

		lasttime = jiffies;

		xfs_buf_ioerror_alert(bp, __this_address);

	}

	lasttarg = bp->b_target;



	/* synchronous writes will have callers process the error */

	if (!(bp->b_flags & XBF_ASYNC))

		return true;

	return false;

}



static bool

xfs_buf_ioerror_retry(

	struct xfs_buf		*bp,

	struct xfs_error_cfg	*cfg)

{

	if ((bp->b_flags & (XBF_STALE | XBF_WRITE_FAIL)) &&

	    bp->b_last_error == bp->b_error)

		return false;



	bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL);

	bp->b_last_error = bp->b_error;

	if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER &&

	    !bp->b_first_retry_time)

		bp->b_first_retry_time = jiffies;

	return true;

}



/*

 * Account for this latest trip around the retry handler, and decide if

 * we've failed enough times to constitute a permanent failure.

 */

static bool

xfs_buf_ioerror_permanent(

	struct xfs_buf		*bp,

	struct xfs_error_cfg	*cfg)

{

	struct xfs_mount	*mp = bp->b_mount;



	if (cfg->max_retries != XFS_ERR_RETRY_FOREVER &&

	    ++bp->b_retries > cfg->max_retries)

		return true;

	if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER &&

	    time_after(jiffies, cfg->retry_timeout + bp->b_first_retry_time))

		return true;



	/* At unmount we may treat errors differently */

	if ((mp->m_flags & XFS_MOUNT_UNMOUNTING) && mp->m_fail_unmount)

		return true;



	return false;

}



/*

 * On a sync write or shutdown we just want to stale the buffer and let the

 * caller handle the error in bp->b_error appropriately.

 *

 * If the write was asynchronous then no one will be looking for the error.  If

 * this is the first failure of this type, clear the error state and write the

 * buffer out again. This means we always retry an async write failure at least

 * once, but we also need to set the buffer up to behave correctly now for

 * repeated failures.

 *

 * If we get repeated async write failures, then we take action according to the

 * error configuration we have been set up to use.

 *

 * Multi-state return value:

 *

 * XBF_IOEND_FINISH: run callback completions

 * XBF_IOEND_DONE: resubmitted immediately, do not run any completions

 * XBF_IOEND_FAIL: transient error, run failure callback completions and then

 *    release the buffer

 */

enum xfs_buf_ioend_disposition {

	XBF_IOEND_FINISH,

	XBF_IOEND_DONE,

	XBF_IOEND_FAIL,

};



static enum xfs_buf_ioend_disposition

xfs_buf_ioend_disposition(

	struct xfs_buf		*bp)

{

	struct xfs_mount	*mp = bp->b_mount;

	struct xfs_error_cfg	*cfg;



	if (likely(!bp->b_error))

		return XBF_IOEND_FINISH;



	if (xfs_buf_ioerror_fail_without_retry(bp))

		goto out_stale;



	trace_xfs_buf_iodone_async(bp, _RET_IP_);



	cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error);

	if (xfs_buf_ioerror_retry(bp, cfg)) {

		xfs_buf_ioerror(bp, 0);

		xfs_buf_submit(bp);

		return XBF_IOEND_DONE;

	}



	/*

	 * Permanent error - we need to trigger a shutdown if we haven't already

	 * to indicate that inconsistency will result from this action.

	 */

	if (xfs_buf_ioerror_permanent(bp, cfg)) {

		xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);

		goto out_stale;

	}



	/* Still considered a transient error. Caller will schedule retries. */

	return XBF_IOEND_FAIL;



out_stale:

	xfs_buf_stale(bp);

	bp->b_flags |= XBF_DONE;

	trace_xfs_buf_error_relse(bp, _RET_IP_);

	return XBF_IOEND_FINISH;

}



static void

xfs_buf_ioend(
@@ -1210,12 +1347,42 @@ xfs_buf_ioend( 
			bp->b_flags |= XBF_DONE;

		}



		switch (xfs_buf_ioend_disposition(bp)) {

		case XBF_IOEND_DONE:

			return;

		case XBF_IOEND_FAIL:

			if (bp->b_flags & _XBF_INODES)

				xfs_buf_inode_io_fail(bp);

			else if (bp->b_flags & _XBF_DQUOTS)

				xfs_buf_dquot_io_fail(bp);

			else

				ASSERT(list_empty(&bp->b_li_list));

			xfs_buf_ioerror(bp, 0);

			xfs_buf_relse(bp);

			return;

		default:

			break;

		}



		/* clear the retry state */

		bp->b_last_error = 0;

		bp->b_retries = 0;

		bp->b_first_retry_time = 0;



		/*

		 * Note that for things like remote attribute buffers, there may

		 * not be a buffer log item here, so processing the buffer log

		 * item must remain optional.

		 */

		if (bp->b_log_item)

			xfs_buf_item_done(bp);



		if (bp->b_flags & _XBF_INODES)

			xfs_buf_inode_iodone(bp);

		else if (bp->b_flags & _XBF_DQUOTS)

			xfs_buf_dquot_iodone(bp);

		else

			xfs_buf_iodone(bp);



		xfs_buf_ioend_finish(bp);

	}

}

fs/xfs/xfs_buf_item.c

+2 −258
Original line number Diff line number Diff line
@@ -30,8 +30,6 @@ static inline struct xfs_buf_log_item *BUF_ITEM(struct xfs_log_item *lip) 
	return container_of(lip, struct xfs_buf_log_item, bli_item);

}



static void xfs_buf_item_done(struct xfs_buf *bp);



/* Is this log iovec plausibly large enough to contain the buffer log format? */

bool

xfs_buf_log_check_iovec(
@@ -463,7 +461,7 @@ xfs_buf_item_unpin( 
		 */

		if (bip->bli_flags & XFS_BLI_STALE_INODE) {

			xfs_buf_item_done(bp);

			xfs_iflush_done(bp);

			xfs_buf_inode_iodone(bp);

			ASSERT(list_empty(&bp->b_li_list));

		} else {

			xfs_trans_ail_delete(lip, SHUTDOWN_LOG_IO_ERROR);
@@ -956,156 +954,12 @@ xfs_buf_item_relse( 
	xfs_buf_item_free(bip);

}



/*

 * Decide if we're going to retry the write after a failure, and prepare

 * the buffer for retrying the write.

 */

static bool

xfs_buf_ioerror_fail_without_retry(

	struct xfs_buf		*bp)

{

	struct xfs_mount	*mp = bp->b_mount;

	static ulong		lasttime;

	static xfs_buftarg_t	*lasttarg;



	/*

	 * If we've already decided to shutdown the filesystem because of

	 * I/O errors, there's no point in giving this a retry.

	 */

	if (XFS_FORCED_SHUTDOWN(mp))

		return true;



	if (bp->b_target != lasttarg ||

	    time_after(jiffies, (lasttime + 5*HZ))) {

		lasttime = jiffies;

		xfs_buf_ioerror_alert(bp, __this_address);

	}

	lasttarg = bp->b_target;



	/* synchronous writes will have callers process the error */

	if (!(bp->b_flags & XBF_ASYNC))

		return true;

	return false;

}



static bool

xfs_buf_ioerror_retry(

	struct xfs_buf		*bp,

	struct xfs_error_cfg	*cfg)

{

	if ((bp->b_flags & (XBF_STALE | XBF_WRITE_FAIL)) &&

	    bp->b_last_error == bp->b_error)

		return false;



	bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL);

	bp->b_last_error = bp->b_error;

	if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER &&

	    !bp->b_first_retry_time)

		bp->b_first_retry_time = jiffies;

	return true;

}



/*

 * Account for this latest trip around the retry handler, and decide if

 * we've failed enough times to constitute a permanent failure.

 */

static bool

xfs_buf_ioerror_permanent(

	struct xfs_buf		*bp,

	struct xfs_error_cfg	*cfg)

{

	struct xfs_mount	*mp = bp->b_mount;



	if (cfg->max_retries != XFS_ERR_RETRY_FOREVER &&

	    ++bp->b_retries > cfg->max_retries)

		return true;

	if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER &&

	    time_after(jiffies, cfg->retry_timeout + bp->b_first_retry_time))

		return true;



	/* At unmount we may treat errors differently */

	if ((mp->m_flags & XFS_MOUNT_UNMOUNTING) && mp->m_fail_unmount)

		return true;



	return false;

}



/*

 * On a sync write or shutdown we just want to stale the buffer and let the

 * caller handle the error in bp->b_error appropriately.

 *

 * If the write was asynchronous then no one will be looking for the error.  If

 * this is the first failure of this type, clear the error state and write the

 * buffer out again. This means we always retry an async write failure at least

 * once, but we also need to set the buffer up to behave correctly now for

 * repeated failures.

 *

 * If we get repeated async write failures, then we take action according to the

 * error configuration we have been set up to use.

 *

 * Multi-state return value:

 *

 * XBF_IOEND_FINISH: run callback completions

 * XBF_IOEND_DONE: resubmitted immediately, do not run any completions

 * XBF_IOEND_FAIL: transient error, run failure callback completions and then

 *    release the buffer

 */

enum xfs_buf_ioend_disposition {

	XBF_IOEND_FINISH,

	XBF_IOEND_DONE,

	XBF_IOEND_FAIL,

};



static enum xfs_buf_ioend_disposition

xfs_buf_ioend_disposition(

	struct xfs_buf		*bp)

{

	struct xfs_mount	*mp = bp->b_mount;

	struct xfs_error_cfg	*cfg;



	if (likely(!bp->b_error))

		return XBF_IOEND_FINISH;



	if (xfs_buf_ioerror_fail_without_retry(bp))

		goto out_stale;



	trace_xfs_buf_item_iodone_async(bp, _RET_IP_);



	cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error);

	if (xfs_buf_ioerror_retry(bp, cfg)) {

		xfs_buf_ioerror(bp, 0);

		xfs_buf_submit(bp);

		return XBF_IOEND_DONE;

	}



	/*

	 * Permanent error - we need to trigger a shutdown if we haven't already

	 * to indicate that inconsistency will result from this action.

	 */

	if (xfs_buf_ioerror_permanent(bp, cfg)) {

		xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);

		goto out_stale;

	}



	/* Still considered a transient error. Caller will schedule retries. */

	return XBF_IOEND_FAIL;



out_stale:

	xfs_buf_stale(bp);

	bp->b_flags |= XBF_DONE;

	trace_xfs_buf_error_relse(bp, _RET_IP_);

	return XBF_IOEND_FINISH;

}



static void

void

xfs_buf_item_done(

	struct xfs_buf		*bp)

{

	struct xfs_buf_log_item	*bip = bp->b_log_item;



	if (!bip)

		return;



	/*

	 * If we are forcibly shutting down, this may well be off the AIL

	 * already. That's because we simulate the log-committed callbacks to
@@ -1120,113 +974,3 @@ xfs_buf_item_done( 
	xfs_buf_item_free(bip);

	xfs_buf_rele(bp);

}
 


static inline void

xfs_buf_clear_ioerror_retry_state(

	struct xfs_buf		*bp)

{

	bp->b_last_error = 0;

	bp->b_retries = 0;

	bp->b_first_retry_time = 0;

}



static void

xfs_buf_inode_io_fail(

	struct xfs_buf		*bp)

{

	struct xfs_log_item	*lip;



	list_for_each_entry(lip, &bp->b_li_list, li_bio_list)

		set_bit(XFS_LI_FAILED, &lip->li_flags);



	xfs_buf_ioerror(bp, 0);

	xfs_buf_relse(bp);

}



/*

 * Inode buffer iodone callback function.

 */

void

xfs_buf_inode_iodone(

	struct xfs_buf		*bp)

{

	switch (xfs_buf_ioend_disposition(bp)) {

	case XBF_IOEND_DONE:

		return;

	case XBF_IOEND_FAIL:

		xfs_buf_inode_io_fail(bp);

		return;

	default:

		break;

	}



	xfs_buf_clear_ioerror_retry_state(bp);

	xfs_buf_item_done(bp);

	xfs_iflush_done(bp);

	xfs_buf_ioend_finish(bp);

}



static void

xfs_buf_dquot_io_fail(

	struct xfs_buf		*bp)

{

	struct xfs_log_item	*lip;



	spin_lock(&bp->b_mount->m_ail->ail_lock);

	list_for_each_entry(lip, &bp->b_li_list, li_bio_list)

		xfs_set_li_failed(lip, bp);

	spin_unlock(&bp->b_mount->m_ail->ail_lock);

	xfs_buf_ioerror(bp, 0);

	xfs_buf_relse(bp);

}



/*

 * Dquot buffer iodone callback function.

 */

void

xfs_buf_dquot_iodone(

	struct xfs_buf		*bp)

{

	switch (xfs_buf_ioend_disposition(bp)) {

	case XBF_IOEND_DONE:

		return;

	case XBF_IOEND_FAIL:

		xfs_buf_dquot_io_fail(bp);

		return;

	default:

		break;

	}



	xfs_buf_clear_ioerror_retry_state(bp);

	/* a newly allocated dquot buffer might have a log item attached */

	xfs_buf_item_done(bp);

	xfs_dquot_done(bp);

	xfs_buf_ioend_finish(bp);

}



/*

 * Dirty buffer iodone callback function.

 *

 * Note that for things like remote attribute buffers, there may not be a buffer

 * log item here, so processing the buffer log item must remain be optional.

 */

void

xfs_buf_iodone(

	struct xfs_buf		*bp)

{

	switch (xfs_buf_ioend_disposition(bp)) {

	case XBF_IOEND_DONE:

		return;

	case XBF_IOEND_FAIL:

		ASSERT(list_empty(&bp->b_li_list));

		xfs_buf_ioerror(bp, 0);

		xfs_buf_relse(bp);

		return;

	default:

		break;

	}



	xfs_buf_clear_ioerror_retry_state(bp);

	xfs_buf_item_done(bp);

	xfs_buf_ioend_finish(bp);

}

fs/xfs/xfs_buf_item.h

+12 −0
Original line number Diff line number Diff line
@@ -50,12 +50,24 @@ struct xfs_buf_log_item { 
};



int	xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);

void	xfs_buf_item_done(struct xfs_buf *bp);

void	xfs_buf_item_relse(struct xfs_buf *);

bool	xfs_buf_item_put(struct xfs_buf_log_item *);

void	xfs_buf_item_log(struct xfs_buf_log_item *, uint, uint);

bool	xfs_buf_item_dirty_format(struct xfs_buf_log_item *);

void	xfs_buf_inode_iodone(struct xfs_buf *);

void	xfs_buf_inode_io_fail(struct xfs_buf *bp);

#ifdef CONFIG_XFS_QUOTA

void	xfs_buf_dquot_iodone(struct xfs_buf *);

void	xfs_buf_dquot_io_fail(struct xfs_buf *bp);

#else

static inline void xfs_buf_dquot_iodone(struct xfs_buf *bp)

{

}

static inline void xfs_buf_dquot_io_fail(struct xfs_buf *bp)

{

}

#endif /* CONFIG_XFS_QUOTA */

void	xfs_buf_iodone(struct xfs_buf *);

bool	xfs_buf_log_check_iovec(struct xfs_log_iovec *iovec);

fs/xfs/xfs_dquot.c

+13 −1
Original line number Diff line number Diff line
@@ -1107,7 +1107,7 @@ xfs_qm_dqflush_done( 
}



void

xfs_dquot_done(

xfs_buf_dquot_iodone(

	struct xfs_buf		*bp)

{

	struct xfs_log_item	*lip, *n;
@@ -1118,6 +1118,18 @@ xfs_dquot_done( 
	}

}



void

xfs_buf_dquot_io_fail(

	struct xfs_buf		*bp)

{

	struct xfs_log_item	*lip;



	spin_lock(&bp->b_mount->m_ail->ail_lock);

	list_for_each_entry(lip, &bp->b_li_list, li_bio_list)

		xfs_set_li_failed(lip, bp);

	spin_unlock(&bp->b_mount->m_ail->ail_lock);

}



/* Check incore dquot for errors before we flush. */

static xfs_failaddr_t

xfs_qm_dqflush_check(

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