buffer.c (2d8ad8719591fa803b0d589ed057fa46f49b7155) buffer.c (7dd29d8d865efdb00c0542a5d2c87af8c52ea6c7)
1/*
2 * linux/fs/hpfs/buffer.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * general buffer i/o
7 */
8#include <linux/sched.h>

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27
28/* Map a sector into a buffer and return pointers to it and to the buffer. */
29
30void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
31 int ahead)
32{
33 struct buffer_head *bh;
34
1/*
2 * linux/fs/hpfs/buffer.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * general buffer i/o
7 */
8#include <linux/sched.h>

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27
28/* Map a sector into a buffer and return pointers to it and to the buffer. */
29
30void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
31 int ahead)
32{
33 struct buffer_head *bh;
34
35 hpfs_lock_assert(s);
36
35 cond_resched();
36
37 *bhp = bh = sb_bread(s, secno);
38 if (bh != NULL)
39 return bh->b_data;
40 else {
41 printk("HPFS: hpfs_map_sector: read error\n");
42 return NULL;
43 }
44}
45
46/* Like hpfs_map_sector but don't read anything */
47
48void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
49{
50 struct buffer_head *bh;
51 /*return hpfs_map_sector(s, secno, bhp, 0);*/
52
37 cond_resched();
38
39 *bhp = bh = sb_bread(s, secno);
40 if (bh != NULL)
41 return bh->b_data;
42 else {
43 printk("HPFS: hpfs_map_sector: read error\n");
44 return NULL;
45 }
46}
47
48/* Like hpfs_map_sector but don't read anything */
49
50void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
51{
52 struct buffer_head *bh;
53 /*return hpfs_map_sector(s, secno, bhp, 0);*/
54
55 hpfs_lock_assert(s);
56
53 cond_resched();
54
55 if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
56 if (!buffer_uptodate(bh)) wait_on_buffer(bh);
57 set_buffer_uptodate(bh);
58 return bh->b_data;
59 } else {
60 printk("HPFS: hpfs_get_sector: getblk failed\n");

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65/* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
66
67void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
68 int ahead)
69{
70 struct buffer_head *bh;
71 char *data;
72
57 cond_resched();
58
59 if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
60 if (!buffer_uptodate(bh)) wait_on_buffer(bh);
61 set_buffer_uptodate(bh);
62 return bh->b_data;
63 } else {
64 printk("HPFS: hpfs_get_sector: getblk failed\n");

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69/* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
70
71void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
72 int ahead)
73{
74 struct buffer_head *bh;
75 char *data;
76
77 hpfs_lock_assert(s);
78
73 cond_resched();
74
75 if (secno & 3) {
76 printk("HPFS: hpfs_map_4sectors: unaligned read\n");
77 return NULL;
78 }
79
80 qbh->data = data = kmalloc(2048, GFP_NOFS);

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120
121/* Don't read sectors */
122
123void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
124 struct quad_buffer_head *qbh)
125{
126 cond_resched();
127
79 cond_resched();
80
81 if (secno & 3) {
82 printk("HPFS: hpfs_map_4sectors: unaligned read\n");
83 return NULL;
84 }
85
86 qbh->data = data = kmalloc(2048, GFP_NOFS);

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126
127/* Don't read sectors */
128
129void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
130 struct quad_buffer_head *qbh)
131{
132 cond_resched();
133
134 hpfs_lock_assert(s);
135
128 if (secno & 3) {
129 printk("HPFS: hpfs_get_4sectors: unaligned read\n");
130 return NULL;
131 }
132
133 /*return hpfs_map_4sectors(s, secno, qbh, 0);*/
134 if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
135 printk("HPFS: hpfs_get_4sectors: out of memory\n");

--- 41 unchanged lines hidden --- 		136 if (secno & 3) {
137 printk("HPFS: hpfs_get_4sectors: unaligned read\n");
138 return NULL;
139 }
140
141 /*return hpfs_map_4sectors(s, secno, qbh, 0);*/
142 if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
143 printk("HPFS: hpfs_get_4sectors: out of memory\n");

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