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Revision 7bf811a595a895b7a886dcf218d0d34f97df76dc authored by Josef Bacik on 08 October 2013, 02:11:09 UTC, committed by Chris Mason on 11 October 2013, 01:27:56 UTC 
Btrfs: limit delalloc pages outside of find_delalloc_range
 
Liu fixed part of this problem and unfortunately I steered him in slightly the
wrong direction and so didn't completely fix the problem.  The problem is we
limit the size of the delalloc range we are looking for to max bytes and then we
try to lock that range.  If we fail to lock the pages in that range we will
shrink the max bytes to a single page and re loop.  However if our first page is
inside of the delalloc range then we will end up limiting the end of the range
to a period before our first page.  This is illustrated below

[0 -------- delalloc range --------- 256mb]
                                  [page]

So find_delalloc_range will return with delalloc_start as 0 and end as 128mb,
and then we will notice that delalloc_start < *start and adjust it up, but not
adjust delalloc_end up, so things go sideways.  To fix this we need to not limit
the max bytes in find_delalloc_range, but in find_lock_delalloc_range and that
way we don't end up with this confusion.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
1 parent 4871c15
Raw File
font.h 
/*
 *  font.h -- `Soft' font definitions
 *
 *  Created 1995 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive
 *  for more details.
 */

#ifndef _VIDEO_FONT_H
#define _VIDEO_FONT_H

#include <linux/types.h>

struct font_desc {
    int idx;
    const char *name;
    int width, height;
    const void *data;
    int pref;
};

#define VGA8x8_IDX	0
#define VGA8x16_IDX	1
#define PEARL8x8_IDX	2
#define VGA6x11_IDX	3
#define FONT7x14_IDX	4
#define	FONT10x18_IDX	5
#define SUN8x16_IDX	6
#define SUN12x22_IDX	7
#define ACORN8x8_IDX	8
#define	MINI4x6_IDX	9

extern const struct font_desc	font_vga_8x8,
			font_vga_8x16,
			font_pearl_8x8,
			font_vga_6x11,
			font_7x14,
			font_10x18,
			font_sun_8x16,
			font_sun_12x22,
			font_acorn_8x8,
			font_mini_4x6;

/* Find a font with a specific name */

extern const struct font_desc *find_font(const char *name);

/* Get the default font for a specific screen size */

extern const struct font_desc *get_default_font(int xres, int yres,
						u32 font_w, u32 font_h);

/* Max. length for the name of a predefined font */
#define MAX_FONT_NAME	32

#endif /* _VIDEO_FONT_H */
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