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Revision fd45e4784164d1017521086524e3442318c67370 authored by Dave Chinner on 02 January 2010, 02:38:56 UTC, committed by Alex Elder on 10 January 2010, 18:22:02 UTC 
xfs: Ensure we force all busy extents in range to disk
 
When we search for and find a busy extent during allocation we
force the log out to ensure the extent free transaction is on
disk before the allocation transaction. The current implementation
has a subtle bug in it--it does not handle multiple overlapping
ranges.

That is, if we free lots of little extents into a single
contiguous extent, then allocate the contiguous extent, the busy
search code stops searching at the first extent it finds that
overlaps the allocated range. It then uses the commit LSN of the
transaction to force the log out to.

Unfortunately, the other busy ranges might have more recent
commit LSNs than the first busy extent that is found, and this
results in xfs_alloc_search_busy() returning before all the
extent free transactions are on disk for the range being
allocated. This can lead to potential metadata corruption or
stale data exposure after a crash because log replay won't replay
all the extent free transactions that cover the allocation range.

Modified-by: Alex Elder <aelder@sgi.com>

(Dropped the "found" argument from the xfs_alloc_busysearch trace
event.)

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
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Raw File
da8xx-fb.h 
/*
 * Header file for TI DA8XX LCD controller platform data.
 *
 * Copyright (C) 2008-2009 MontaVista Software Inc.
 * Copyright (C) 2008-2009 Texas Instruments Inc
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#ifndef DA8XX_FB_H
#define DA8XX_FB_H

enum panel_type {
	QVGA = 0
};

enum panel_shade {
	MONOCHROME = 0,
	COLOR_ACTIVE,
	COLOR_PASSIVE,
};

enum raster_load_mode {
	LOAD_DATA = 1,
	LOAD_PALETTE,
};

struct display_panel {
	enum panel_type panel_type; /* QVGA */
	int max_bpp;
	int min_bpp;
	enum panel_shade panel_shade;
};

struct da8xx_lcdc_platform_data {
	const char manu_name[10];
	void *controller_data;
	const char type[25];
	void (*panel_power_ctrl)(int);
};

struct lcd_ctrl_config {
	const struct display_panel *p_disp_panel;

	/* AC Bias Pin Frequency */
	int ac_bias;

	/* AC Bias Pin Transitions per Interrupt */
	int ac_bias_intrpt;

	/* DMA burst size */
	int dma_burst_sz;

	/* Bits per pixel */
	int bpp;

	/* FIFO DMA Request Delay */
	int fdd;

	/* TFT Alternative Signal Mapping (Only for active) */
	unsigned char tft_alt_mode;

	/* 12 Bit Per Pixel (5-6-5) Mode (Only for passive) */
	unsigned char stn_565_mode;

	/* Mono 8-bit Mode: 1=D0-D7 or 0=D0-D3 */
	unsigned char mono_8bit_mode;

	/* Invert line clock */
	unsigned char invert_line_clock;

	/* Invert frame clock  */
	unsigned char invert_frm_clock;

	/* Horizontal and Vertical Sync Edge: 0=rising 1=falling */
	unsigned char sync_edge;

	/* Horizontal and Vertical Sync: Control: 0=ignore */
	unsigned char sync_ctrl;

	/* Raster Data Order Select: 1=Most-to-least 0=Least-to-most */
	unsigned char raster_order;
};

struct lcd_sync_arg {
	int back_porch;
	int front_porch;
	int pulse_width;
};

/* ioctls */
#define FBIOGET_CONTRAST	_IOR('F', 1, int)
#define FBIOPUT_CONTRAST	_IOW('F', 2, int)
#define FBIGET_BRIGHTNESS	_IOR('F', 3, int)
#define FBIPUT_BRIGHTNESS	_IOW('F', 3, int)
#define FBIGET_COLOR		_IOR('F', 5, int)
#define FBIPUT_COLOR		_IOW('F', 6, int)
#define FBIPUT_HSYNC		_IOW('F', 9, int)
#define FBIPUT_VSYNC		_IOW('F', 10, int)

#endif  /* ifndef DA8XX_FB_H */
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