super.c (020abf03cd659388f94cb328e1e1df0656e0d7ff) super.c (8de52778798fe39660a8d6b26f290e0c93202761)
1/*
2 * linux/fs/sysv/inode.c
3 *
4 * minix/inode.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * xenix/inode.c
8 * Copyright (C) 1992 Doug Evans

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39 * We discriminate among SystemV4 and SystemV2 FS by the assumption that
40 * the time stamp is not < 01-01-1980.
41 */
42
43enum {
44 JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
45};
46
1/*
2 * linux/fs/sysv/inode.c
3 *
4 * minix/inode.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * xenix/inode.c
8 * Copyright (C) 1992 Doug Evans

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39 * We discriminate among SystemV4 and SystemV2 FS by the assumption that
40 * the time stamp is not < 01-01-1980.
41 */
42
43enum {
44 JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
45};
46
47static void detected_xenix(struct sysv_sb_info *sbi)
47static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
48{
49 struct buffer_head *bh1 = sbi->s_bh1;
50 struct buffer_head *bh2 = sbi->s_bh2;
51 struct xenix_super_block * sbd1;
52 struct xenix_super_block * sbd2;
53
54 if (bh1 != bh2)
55 sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
56 else {
57 /* block size = 512, so bh1 != bh2 */
58 sbd1 = (struct xenix_super_block *) bh1->b_data;
59 sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
60 }
61
48{
49 struct buffer_head *bh1 = sbi->s_bh1;
50 struct buffer_head *bh2 = sbi->s_bh2;
51 struct xenix_super_block * sbd1;
52 struct xenix_super_block * sbd2;
53
54 if (bh1 != bh2)
55 sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
56 else {
57 /* block size = 512, so bh1 != bh2 */
58 sbd1 = (struct xenix_super_block *) bh1->b_data;
59 sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
60 }
61
62 sbi->s_link_max = XENIX_LINK_MAX;
62 *max_links = XENIX_LINK_MAX;
63 sbi->s_fic_size = XENIX_NICINOD;
64 sbi->s_flc_size = XENIX_NICFREE;
65 sbi->s_sbd1 = (char *)sbd1;
66 sbi->s_sbd2 = (char *)sbd2;
67 sbi->s_sb_fic_count = &sbd1->s_ninode;
68 sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
69 sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
70 sbi->s_bcache_count = &sbd1->s_nfree;
71 sbi->s_bcache = &sbd1->s_free[0];
72 sbi->s_free_blocks = &sbd2->s_tfree;
73 sbi->s_sb_time = &sbd2->s_time;
74 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
75 sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
76}
77
63 sbi->s_fic_size = XENIX_NICINOD;
64 sbi->s_flc_size = XENIX_NICFREE;
65 sbi->s_sbd1 = (char *)sbd1;
66 sbi->s_sbd2 = (char *)sbd2;
67 sbi->s_sb_fic_count = &sbd1->s_ninode;
68 sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
69 sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
70 sbi->s_bcache_count = &sbd1->s_nfree;
71 sbi->s_bcache = &sbd1->s_free[0];
72 sbi->s_free_blocks = &sbd2->s_tfree;
73 sbi->s_sb_time = &sbd2->s_time;
74 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
75 sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
76}
77
78static void detected_sysv4(struct sysv_sb_info *sbi)
78static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
79{
80 struct sysv4_super_block * sbd;
81 struct buffer_head *bh1 = sbi->s_bh1;
82 struct buffer_head *bh2 = sbi->s_bh2;
83
84 if (bh1 == bh2)
85 sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
86 else
87 sbd = (struct sysv4_super_block *) bh2->b_data;
88
79{
80 struct sysv4_super_block * sbd;
81 struct buffer_head *bh1 = sbi->s_bh1;
82 struct buffer_head *bh2 = sbi->s_bh2;
83
84 if (bh1 == bh2)
85 sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
86 else
87 sbd = (struct sysv4_super_block *) bh2->b_data;
88
89 sbi->s_link_max = SYSV_LINK_MAX;
89 *max_links = SYSV_LINK_MAX;
90 sbi->s_fic_size = SYSV_NICINOD;
91 sbi->s_flc_size = SYSV_NICFREE;
92 sbi->s_sbd1 = (char *)sbd;
93 sbi->s_sbd2 = (char *)sbd;
94 sbi->s_sb_fic_count = &sbd->s_ninode;
95 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
96 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
97 sbi->s_bcache_count = &sbd->s_nfree;
98 sbi->s_bcache = &sbd->s_free[0];
99 sbi->s_free_blocks = &sbd->s_tfree;
100 sbi->s_sb_time = &sbd->s_time;
101 sbi->s_sb_state = &sbd->s_state;
102 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
103 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
104}
105
90 sbi->s_fic_size = SYSV_NICINOD;
91 sbi->s_flc_size = SYSV_NICFREE;
92 sbi->s_sbd1 = (char *)sbd;
93 sbi->s_sbd2 = (char *)sbd;
94 sbi->s_sb_fic_count = &sbd->s_ninode;
95 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
96 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
97 sbi->s_bcache_count = &sbd->s_nfree;
98 sbi->s_bcache = &sbd->s_free[0];
99 sbi->s_free_blocks = &sbd->s_tfree;
100 sbi->s_sb_time = &sbd->s_time;
101 sbi->s_sb_state = &sbd->s_state;
102 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
103 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
104}
105
106static void detected_sysv2(struct sysv_sb_info *sbi)
106static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
107{
108 struct sysv2_super_block *sbd;
109 struct buffer_head *bh1 = sbi->s_bh1;
110 struct buffer_head *bh2 = sbi->s_bh2;
111
112 if (bh1 == bh2)
113 sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
114 else
115 sbd = (struct sysv2_super_block *) bh2->b_data;
116
107{
108 struct sysv2_super_block *sbd;
109 struct buffer_head *bh1 = sbi->s_bh1;
110 struct buffer_head *bh2 = sbi->s_bh2;
111
112 if (bh1 == bh2)
113 sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
114 else
115 sbd = (struct sysv2_super_block *) bh2->b_data;
116
117 sbi->s_link_max = SYSV_LINK_MAX;
117 *max_links = SYSV_LINK_MAX;
118 sbi->s_fic_size = SYSV_NICINOD;
119 sbi->s_flc_size = SYSV_NICFREE;
120 sbi->s_sbd1 = (char *)sbd;
121 sbi->s_sbd2 = (char *)sbd;
122 sbi->s_sb_fic_count = &sbd->s_ninode;
123 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
124 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
125 sbi->s_bcache_count = &sbd->s_nfree;
126 sbi->s_bcache = &sbd->s_free[0];
127 sbi->s_free_blocks = &sbd->s_tfree;
128 sbi->s_sb_time = &sbd->s_time;
129 sbi->s_sb_state = &sbd->s_state;
130 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
131 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
132}
133
118 sbi->s_fic_size = SYSV_NICINOD;
119 sbi->s_flc_size = SYSV_NICFREE;
120 sbi->s_sbd1 = (char *)sbd;
121 sbi->s_sbd2 = (char *)sbd;
122 sbi->s_sb_fic_count = &sbd->s_ninode;
123 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
124 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
125 sbi->s_bcache_count = &sbd->s_nfree;
126 sbi->s_bcache = &sbd->s_free[0];
127 sbi->s_free_blocks = &sbd->s_tfree;
128 sbi->s_sb_time = &sbd->s_time;
129 sbi->s_sb_state = &sbd->s_state;
130 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
131 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
132}
133
134static void detected_coherent(struct sysv_sb_info *sbi)
134static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
135{
136 struct coh_super_block * sbd;
137 struct buffer_head *bh1 = sbi->s_bh1;
138
139 sbd = (struct coh_super_block *) bh1->b_data;
140
135{
136 struct coh_super_block * sbd;
137 struct buffer_head *bh1 = sbi->s_bh1;
138
139 sbd = (struct coh_super_block *) bh1->b_data;
140
141 sbi->s_link_max = COH_LINK_MAX;
141 *max_links = COH_LINK_MAX;
142 sbi->s_fic_size = COH_NICINOD;
143 sbi->s_flc_size = COH_NICFREE;
144 sbi->s_sbd1 = (char *)sbd;
145 sbi->s_sbd2 = (char *)sbd;
146 sbi->s_sb_fic_count = &sbd->s_ninode;
147 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
148 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
149 sbi->s_bcache_count = &sbd->s_nfree;
150 sbi->s_bcache = &sbd->s_free[0];
151 sbi->s_free_blocks = &sbd->s_tfree;
152 sbi->s_sb_time = &sbd->s_time;
153 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
154 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
155}
156
142 sbi->s_fic_size = COH_NICINOD;
143 sbi->s_flc_size = COH_NICFREE;
144 sbi->s_sbd1 = (char *)sbd;
145 sbi->s_sbd2 = (char *)sbd;
146 sbi->s_sb_fic_count = &sbd->s_ninode;
147 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
148 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
149 sbi->s_bcache_count = &sbd->s_nfree;
150 sbi->s_bcache = &sbd->s_free[0];
151 sbi->s_free_blocks = &sbd->s_tfree;
152 sbi->s_sb_time = &sbd->s_time;
153 sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
154 sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
155}
156
157static void detected_v7(struct sysv_sb_info *sbi)
157static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
158{
159 struct buffer_head *bh2 = sbi->s_bh2;
160 struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
161
158{
159 struct buffer_head *bh2 = sbi->s_bh2;
160 struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
161
162 sbi->s_link_max = V7_LINK_MAX;
162 *max_links = V7_LINK_MAX;
163 sbi->s_fic_size = V7_NICINOD;
164 sbi->s_flc_size = V7_NICFREE;
165 sbi->s_sbd1 = (char *)sbd;
166 sbi->s_sbd2 = (char *)sbd;
167 sbi->s_sb_fic_count = &sbd->s_ninode;
168 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
169 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
170 sbi->s_bcache_count = &sbd->s_nfree;

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285 [FSTYPE_XENIX] = "Xenix",
286 [FSTYPE_SYSV4] = "SystemV",
287 [FSTYPE_SYSV2] = "SystemV Release 2",
288 [FSTYPE_COH] = "Coherent",
289 [FSTYPE_V7] = "V7",
290 [FSTYPE_AFS] = "AFS",
291};
292
163 sbi->s_fic_size = V7_NICINOD;
164 sbi->s_flc_size = V7_NICFREE;
165 sbi->s_sbd1 = (char *)sbd;
166 sbi->s_sbd2 = (char *)sbd;
167 sbi->s_sb_fic_count = &sbd->s_ninode;
168 sbi->s_sb_fic_inodes = &sbd->s_inode[0];
169 sbi->s_sb_total_free_inodes = &sbd->s_tinode;
170 sbi->s_bcache_count = &sbd->s_nfree;

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285 [FSTYPE_XENIX] = "Xenix",
286 [FSTYPE_SYSV4] = "SystemV",
287 [FSTYPE_SYSV2] = "SystemV Release 2",
288 [FSTYPE_COH] = "Coherent",
289 [FSTYPE_V7] = "V7",
290 [FSTYPE_AFS] = "AFS",
291};
292
293static void (*flavour_setup[])(struct sysv_sb_info *) = {
293static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
294 [FSTYPE_XENIX] = detected_xenix,
295 [FSTYPE_SYSV4] = detected_sysv4,
296 [FSTYPE_SYSV2] = detected_sysv2,
297 [FSTYPE_COH] = detected_coherent,
298 [FSTYPE_V7] = detected_v7,
299 [FSTYPE_AFS] = detected_sysv4,
300};
301
302static int complete_read_super(struct super_block *sb, int silent, int size)
303{
304 struct sysv_sb_info *sbi = SYSV_SB(sb);
305 struct inode *root_inode;
306 char *found = flavour_names[sbi->s_type];
307 u_char n_bits = size+8;
308 int bsize = 1 << n_bits;
309 int bsize_4 = bsize >> 2;
310
311 sbi->s_firstinodezone = 2;
312
294 [FSTYPE_XENIX] = detected_xenix,
295 [FSTYPE_SYSV4] = detected_sysv4,
296 [FSTYPE_SYSV2] = detected_sysv2,
297 [FSTYPE_COH] = detected_coherent,
298 [FSTYPE_V7] = detected_v7,
299 [FSTYPE_AFS] = detected_sysv4,
300};
301
302static int complete_read_super(struct super_block *sb, int silent, int size)
303{
304 struct sysv_sb_info *sbi = SYSV_SB(sb);
305 struct inode *root_inode;
306 char *found = flavour_names[sbi->s_type];
307 u_char n_bits = size+8;
308 int bsize = 1 << n_bits;
309 int bsize_4 = bsize >> 2;
310
311 sbi->s_firstinodezone = 2;
312
313 flavour_setup[sbi->s_type](sbi);
313 flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
314
315 sbi->s_truncate = 1;
316 sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
317 sbi->s_inodes_per_block = bsize >> 6;
318 sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
319 sbi->s_inodes_per_block_bits = n_bits-6;
320 sbi->s_ind_per_block = bsize_4;
321 sbi->s_ind_per_block_2 = bsize_4*bsize_4;

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315 sbi->s_truncate = 1;
316 sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
317 sbi->s_inodes_per_block = bsize >> 6;
318 sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
319 sbi->s_inodes_per_block_bits = n_bits-6;
320 sbi->s_ind_per_block = bsize_4;
321 sbi->s_ind_per_block_2 = bsize_4*bsize_4;

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