2 * linux/fs/hpfs/buffer.c
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
8 #include <linux/sched.h>
11 void hpfs_lock_creation(struct super_block *s)
14 printk("lock creation\n");
16 down(&hpfs_sb(s)->hpfs_creation_de);
19 void hpfs_unlock_creation(struct super_block *s)
22 printk("unlock creation\n");
24 up(&hpfs_sb(s)->hpfs_creation_de);
27 /* Map a sector into a buffer and return pointers to it and to the buffer. */
29 void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
32 struct buffer_head *bh;
36 *bhp = bh = sb_bread(s, secno);
40 printk("HPFS: hpfs_map_sector: read error\n");
45 /* Like hpfs_map_sector but don't read anything */
47 void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
49 struct buffer_head *bh;
50 /*return hpfs_map_sector(s, secno, bhp, 0);*/
54 if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
55 if (!buffer_uptodate(bh)) wait_on_buffer(bh);
56 set_buffer_uptodate(bh);
59 printk("HPFS: hpfs_get_sector: getblk failed\n");
64 /* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
66 void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
69 struct buffer_head *bh;
75 printk("HPFS: hpfs_map_4sectors: unaligned read\n");
79 qbh->data = data = kmalloc(2048, GFP_NOFS);
81 printk("HPFS: hpfs_map_4sectors: out of memory\n");
85 qbh->bh[0] = bh = sb_bread(s, secno);
88 memcpy(data, bh->b_data, 512);
90 qbh->bh[1] = bh = sb_bread(s, secno + 1);
93 memcpy(data + 512, bh->b_data, 512);
95 qbh->bh[2] = bh = sb_bread(s, secno + 2);
98 memcpy(data + 2 * 512, bh->b_data, 512);
100 qbh->bh[3] = bh = sb_bread(s, secno + 3);
103 memcpy(data + 3 * 512, bh->b_data, 512);
115 printk("HPFS: hpfs_map_4sectors: read error\n");
120 /* Don't read sectors */
122 void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
123 struct quad_buffer_head *qbh)
128 printk("HPFS: hpfs_get_4sectors: unaligned read\n");
132 /*return hpfs_map_4sectors(s, secno, qbh, 0);*/
133 if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
134 printk("HPFS: hpfs_get_4sectors: out of memory\n");
137 if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
138 if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
139 if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
140 if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
141 memcpy(qbh->data, qbh->bh[0]->b_data, 512);
142 memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
143 memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
144 memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
147 bail3: brelse(qbh->bh[2]);
148 bail2: brelse(qbh->bh[1]);
149 bail1: brelse(qbh->bh[0]);
155 void hpfs_brelse4(struct quad_buffer_head *qbh)
164 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
166 PRINTK(("hpfs_mark_4buffers_dirty\n"));
167 memcpy(qbh->bh[0]->b_data, qbh->data, 512);
168 memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
169 memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
170 memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
171 mark_buffer_dirty(qbh->bh[0]);
172 mark_buffer_dirty(qbh->bh[1]);
173 mark_buffer_dirty(qbh->bh[2]);
174 mark_buffer_dirty(qbh->bh[3]);