1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Optimized MPEG FS - inode and super operati 2 * Optimized MPEG FS - inode and super operations.
4 * Copyright (C) 2006 Bob Copeland <me@bobcope 3 * Copyright (C) 2006 Bob Copeland <me@bobcopeland.com>
>> 4 * Released under GPL v2.
5 */ 5 */
6 #include <linux/module.h> 6 #include <linux/module.h>
7 #include <linux/sched.h> 7 #include <linux/sched.h>
8 #include <linux/slab.h> 8 #include <linux/slab.h>
9 #include <linux/fs.h> 9 #include <linux/fs.h>
10 #include <linux/vfs.h> 10 #include <linux/vfs.h>
11 #include <linux/cred.h> 11 #include <linux/cred.h>
12 #include <linux/parser.h> 12 #include <linux/parser.h>
13 #include <linux/buffer_head.h> 13 #include <linux/buffer_head.h>
14 #include <linux/vmalloc.h> 14 #include <linux/vmalloc.h>
15 #include <linux/writeback.h> 15 #include <linux/writeback.h>
16 #include <linux/seq_file.h> 16 #include <linux/seq_file.h>
17 #include <linux/crc-itu-t.h> 17 #include <linux/crc-itu-t.h>
18 #include "omfs.h" 18 #include "omfs.h"
19 19
20 MODULE_AUTHOR("Bob Copeland <me@bobcopeland.co 20 MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
21 MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) File 21 MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
22 MODULE_LICENSE("GPL"); 22 MODULE_LICENSE("GPL");
23 23
24 struct buffer_head *omfs_bread(struct super_bl 24 struct buffer_head *omfs_bread(struct super_block *sb, sector_t block)
25 { 25 {
26 struct omfs_sb_info *sbi = OMFS_SB(sb) 26 struct omfs_sb_info *sbi = OMFS_SB(sb);
27 if (block >= sbi->s_num_blocks) 27 if (block >= sbi->s_num_blocks)
28 return NULL; 28 return NULL;
29 29
30 return sb_bread(sb, clus_to_blk(sbi, b 30 return sb_bread(sb, clus_to_blk(sbi, block));
31 } 31 }
32 32
33 struct inode *omfs_new_inode(struct inode *dir 33 struct inode *omfs_new_inode(struct inode *dir, umode_t mode)
34 { 34 {
35 struct inode *inode; 35 struct inode *inode;
36 u64 new_block; 36 u64 new_block;
37 int err; 37 int err;
38 int len; 38 int len;
39 struct omfs_sb_info *sbi = OMFS_SB(dir 39 struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb);
40 40
41 inode = new_inode(dir->i_sb); 41 inode = new_inode(dir->i_sb);
42 if (!inode) 42 if (!inode)
43 return ERR_PTR(-ENOMEM); 43 return ERR_PTR(-ENOMEM);
44 44
45 err = omfs_allocate_range(dir->i_sb, s 45 err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors,
46 &new_block, &len); 46 &new_block, &len);
47 if (err) 47 if (err)
48 goto fail; 48 goto fail;
49 49
50 inode->i_ino = new_block; 50 inode->i_ino = new_block;
51 inode_init_owner(&nop_mnt_idmap, inode !! 51 inode_init_owner(inode, NULL, mode);
52 inode->i_mapping->a_ops = &omfs_aops; 52 inode->i_mapping->a_ops = &omfs_aops;
53 53
54 simple_inode_init_ts(inode); !! 54 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
55 switch (mode & S_IFMT) { 55 switch (mode & S_IFMT) {
56 case S_IFDIR: 56 case S_IFDIR:
57 inode->i_op = &omfs_dir_inops; 57 inode->i_op = &omfs_dir_inops;
58 inode->i_fop = &omfs_dir_opera 58 inode->i_fop = &omfs_dir_operations;
59 inode->i_size = sbi->s_sys_blo 59 inode->i_size = sbi->s_sys_blocksize;
60 inc_nlink(inode); 60 inc_nlink(inode);
61 break; 61 break;
62 case S_IFREG: 62 case S_IFREG:
63 inode->i_op = &omfs_file_inops 63 inode->i_op = &omfs_file_inops;
64 inode->i_fop = &omfs_file_oper 64 inode->i_fop = &omfs_file_operations;
65 inode->i_size = 0; 65 inode->i_size = 0;
66 break; 66 break;
67 } 67 }
68 68
69 insert_inode_hash(inode); 69 insert_inode_hash(inode);
70 mark_inode_dirty(inode); 70 mark_inode_dirty(inode);
71 return inode; 71 return inode;
72 fail: 72 fail:
73 make_bad_inode(inode); 73 make_bad_inode(inode);
74 iput(inode); 74 iput(inode);
75 return ERR_PTR(err); 75 return ERR_PTR(err);
76 } 76 }
77 77
78 /* 78 /*
79 * Update the header checksums for a dirty ino 79 * Update the header checksums for a dirty inode based on its contents.
80 * Caller is expected to hold the buffer head 80 * Caller is expected to hold the buffer head underlying oi and mark it
81 * dirty. 81 * dirty.
82 */ 82 */
83 static void omfs_update_checksums(struct omfs_ 83 static void omfs_update_checksums(struct omfs_inode *oi)
84 { 84 {
85 int xor, i, ofs = 0, count; 85 int xor, i, ofs = 0, count;
86 u16 crc = 0; 86 u16 crc = 0;
87 unsigned char *ptr = (unsigned char *) 87 unsigned char *ptr = (unsigned char *) oi;
88 88
89 count = be32_to_cpu(oi->i_head.h_body_ 89 count = be32_to_cpu(oi->i_head.h_body_size);
90 ofs = sizeof(struct omfs_header); 90 ofs = sizeof(struct omfs_header);
91 91
92 crc = crc_itu_t(crc, ptr + ofs, count) 92 crc = crc_itu_t(crc, ptr + ofs, count);
93 oi->i_head.h_crc = cpu_to_be16(crc); 93 oi->i_head.h_crc = cpu_to_be16(crc);
94 94
95 xor = ptr[0]; 95 xor = ptr[0];
96 for (i = 1; i < OMFS_XOR_COUNT; i++) 96 for (i = 1; i < OMFS_XOR_COUNT; i++)
97 xor ^= ptr[i]; 97 xor ^= ptr[i];
98 98
99 oi->i_head.h_check_xor = xor; 99 oi->i_head.h_check_xor = xor;
100 } 100 }
101 101
102 static int __omfs_write_inode(struct inode *in 102 static int __omfs_write_inode(struct inode *inode, int wait)
103 { 103 {
104 struct omfs_inode *oi; 104 struct omfs_inode *oi;
105 struct omfs_sb_info *sbi = OMFS_SB(ino 105 struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
106 struct buffer_head *bh, *bh2; 106 struct buffer_head *bh, *bh2;
107 u64 ctime; 107 u64 ctime;
108 int i; 108 int i;
109 int ret = -EIO; 109 int ret = -EIO;
110 int sync_failed = 0; 110 int sync_failed = 0;
111 111
112 /* get current inode since we may have 112 /* get current inode since we may have written sibling ptrs etc. */
113 bh = omfs_bread(inode->i_sb, inode->i_ 113 bh = omfs_bread(inode->i_sb, inode->i_ino);
114 if (!bh) 114 if (!bh)
115 goto out; 115 goto out;
116 116
117 oi = (struct omfs_inode *) bh->b_data; 117 oi = (struct omfs_inode *) bh->b_data;
118 118
119 oi->i_head.h_self = cpu_to_be64(inode- 119 oi->i_head.h_self = cpu_to_be64(inode->i_ino);
120 if (S_ISDIR(inode->i_mode)) 120 if (S_ISDIR(inode->i_mode))
121 oi->i_type = OMFS_DIR; 121 oi->i_type = OMFS_DIR;
122 else if (S_ISREG(inode->i_mode)) 122 else if (S_ISREG(inode->i_mode))
123 oi->i_type = OMFS_FILE; 123 oi->i_type = OMFS_FILE;
124 else { 124 else {
125 printk(KERN_WARNING "omfs: unk 125 printk(KERN_WARNING "omfs: unknown file type: %d\n",
126 inode->i_mode); 126 inode->i_mode);
127 goto out_brelse; 127 goto out_brelse;
128 } 128 }
129 129
130 oi->i_head.h_body_size = cpu_to_be32(s 130 oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize -
131 sizeof(struct omfs_header)); 131 sizeof(struct omfs_header));
132 oi->i_head.h_version = 1; 132 oi->i_head.h_version = 1;
133 oi->i_head.h_type = OMFS_INODE_NORMAL; 133 oi->i_head.h_type = OMFS_INODE_NORMAL;
134 oi->i_head.h_magic = OMFS_IMAGIC; 134 oi->i_head.h_magic = OMFS_IMAGIC;
135 oi->i_size = cpu_to_be64(inode->i_size 135 oi->i_size = cpu_to_be64(inode->i_size);
136 136
137 ctime = inode_get_ctime_sec(inode) * 1 !! 137 ctime = inode->i_ctime.tv_sec * 1000LL +
138 ((inode_get_ctime_nsec(inode) !! 138 ((inode->i_ctime.tv_nsec + 999)/1000);
139 oi->i_ctime = cpu_to_be64(ctime); 139 oi->i_ctime = cpu_to_be64(ctime);
140 140
141 omfs_update_checksums(oi); 141 omfs_update_checksums(oi);
142 142
143 mark_buffer_dirty(bh); 143 mark_buffer_dirty(bh);
144 if (wait) { 144 if (wait) {
145 sync_dirty_buffer(bh); 145 sync_dirty_buffer(bh);
146 if (buffer_req(bh) && !buffer_ 146 if (buffer_req(bh) && !buffer_uptodate(bh))
147 sync_failed = 1; 147 sync_failed = 1;
148 } 148 }
149 149
150 /* if mirroring writes, copy to next f 150 /* if mirroring writes, copy to next fsblock */
151 for (i = 1; i < sbi->s_mirrors; i++) { 151 for (i = 1; i < sbi->s_mirrors; i++) {
152 bh2 = omfs_bread(inode->i_sb, 152 bh2 = omfs_bread(inode->i_sb, inode->i_ino + i);
153 if (!bh2) 153 if (!bh2)
154 goto out_brelse; 154 goto out_brelse;
155 155
156 memcpy(bh2->b_data, bh->b_data 156 memcpy(bh2->b_data, bh->b_data, bh->b_size);
157 mark_buffer_dirty(bh2); 157 mark_buffer_dirty(bh2);
158 if (wait) { 158 if (wait) {
159 sync_dirty_buffer(bh2) 159 sync_dirty_buffer(bh2);
160 if (buffer_req(bh2) && 160 if (buffer_req(bh2) && !buffer_uptodate(bh2))
161 sync_failed = 161 sync_failed = 1;
162 } 162 }
163 brelse(bh2); 163 brelse(bh2);
164 } 164 }
165 ret = (sync_failed) ? -EIO : 0; 165 ret = (sync_failed) ? -EIO : 0;
166 out_brelse: 166 out_brelse:
167 brelse(bh); 167 brelse(bh);
168 out: 168 out:
169 return ret; 169 return ret;
170 } 170 }
171 171
172 static int omfs_write_inode(struct inode *inod 172 static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc)
173 { 173 {
174 return __omfs_write_inode(inode, wbc-> 174 return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
175 } 175 }
176 176
177 int omfs_sync_inode(struct inode *inode) 177 int omfs_sync_inode(struct inode *inode)
178 { 178 {
179 return __omfs_write_inode(inode, 1); 179 return __omfs_write_inode(inode, 1);
180 } 180 }
181 181
182 /* 182 /*
183 * called when an entry is deleted, need to cl 183 * called when an entry is deleted, need to clear the bits in the
184 * bitmaps. 184 * bitmaps.
185 */ 185 */
186 static void omfs_evict_inode(struct inode *ino 186 static void omfs_evict_inode(struct inode *inode)
187 { 187 {
188 truncate_inode_pages_final(&inode->i_d 188 truncate_inode_pages_final(&inode->i_data);
189 clear_inode(inode); 189 clear_inode(inode);
190 190
191 if (inode->i_nlink) 191 if (inode->i_nlink)
192 return; 192 return;
193 193
194 if (S_ISREG(inode->i_mode)) { 194 if (S_ISREG(inode->i_mode)) {
195 inode->i_size = 0; 195 inode->i_size = 0;
196 omfs_shrink_inode(inode); 196 omfs_shrink_inode(inode);
197 } 197 }
198 198
199 omfs_clear_range(inode->i_sb, inode->i 199 omfs_clear_range(inode->i_sb, inode->i_ino, 2);
200 } 200 }
201 201
202 struct inode *omfs_iget(struct super_block *sb 202 struct inode *omfs_iget(struct super_block *sb, ino_t ino)
203 { 203 {
204 struct omfs_sb_info *sbi = OMFS_SB(sb) 204 struct omfs_sb_info *sbi = OMFS_SB(sb);
205 struct omfs_inode *oi; 205 struct omfs_inode *oi;
206 struct buffer_head *bh; 206 struct buffer_head *bh;
207 u64 ctime; 207 u64 ctime;
208 unsigned long nsecs; 208 unsigned long nsecs;
209 struct inode *inode; 209 struct inode *inode;
210 210
211 inode = iget_locked(sb, ino); 211 inode = iget_locked(sb, ino);
212 if (!inode) 212 if (!inode)
213 return ERR_PTR(-ENOMEM); 213 return ERR_PTR(-ENOMEM);
214 if (!(inode->i_state & I_NEW)) 214 if (!(inode->i_state & I_NEW))
215 return inode; 215 return inode;
216 216
217 bh = omfs_bread(inode->i_sb, ino); 217 bh = omfs_bread(inode->i_sb, ino);
218 if (!bh) 218 if (!bh)
219 goto iget_failed; 219 goto iget_failed;
220 220
221 oi = (struct omfs_inode *)bh->b_data; 221 oi = (struct omfs_inode *)bh->b_data;
222 222
223 /* check self */ 223 /* check self */
224 if (ino != be64_to_cpu(oi->i_head.h_se 224 if (ino != be64_to_cpu(oi->i_head.h_self))
225 goto fail_bh; 225 goto fail_bh;
226 226
227 inode->i_uid = sbi->s_uid; 227 inode->i_uid = sbi->s_uid;
228 inode->i_gid = sbi->s_gid; 228 inode->i_gid = sbi->s_gid;
229 229
230 ctime = be64_to_cpu(oi->i_ctime); 230 ctime = be64_to_cpu(oi->i_ctime);
231 nsecs = do_div(ctime, 1000) * 1000L; 231 nsecs = do_div(ctime, 1000) * 1000L;
232 232
233 inode_set_atime(inode, ctime, nsecs); !! 233 inode->i_atime.tv_sec = ctime;
234 inode_set_mtime(inode, ctime, nsecs); !! 234 inode->i_mtime.tv_sec = ctime;
235 inode_set_ctime(inode, ctime, nsecs); !! 235 inode->i_ctime.tv_sec = ctime;
>> 236 inode->i_atime.tv_nsec = nsecs;
>> 237 inode->i_mtime.tv_nsec = nsecs;
>> 238 inode->i_ctime.tv_nsec = nsecs;
236 239
237 inode->i_mapping->a_ops = &omfs_aops; 240 inode->i_mapping->a_ops = &omfs_aops;
238 241
239 switch (oi->i_type) { 242 switch (oi->i_type) {
240 case OMFS_DIR: 243 case OMFS_DIR:
241 inode->i_mode = S_IFDIR | (S_I 244 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask);
242 inode->i_op = &omfs_dir_inops; 245 inode->i_op = &omfs_dir_inops;
243 inode->i_fop = &omfs_dir_opera 246 inode->i_fop = &omfs_dir_operations;
244 inode->i_size = sbi->s_sys_blo 247 inode->i_size = sbi->s_sys_blocksize;
245 inc_nlink(inode); 248 inc_nlink(inode);
246 break; 249 break;
247 case OMFS_FILE: 250 case OMFS_FILE:
248 inode->i_mode = S_IFREG | (S_I 251 inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask);
249 inode->i_fop = &omfs_file_oper 252 inode->i_fop = &omfs_file_operations;
250 inode->i_size = be64_to_cpu(oi 253 inode->i_size = be64_to_cpu(oi->i_size);
251 break; 254 break;
252 } 255 }
253 brelse(bh); 256 brelse(bh);
254 unlock_new_inode(inode); 257 unlock_new_inode(inode);
255 return inode; 258 return inode;
256 fail_bh: 259 fail_bh:
257 brelse(bh); 260 brelse(bh);
258 iget_failed: 261 iget_failed:
259 iget_failed(inode); 262 iget_failed(inode);
260 return ERR_PTR(-EIO); 263 return ERR_PTR(-EIO);
261 } 264 }
262 265
263 static void omfs_put_super(struct super_block 266 static void omfs_put_super(struct super_block *sb)
264 { 267 {
265 struct omfs_sb_info *sbi = OMFS_SB(sb) 268 struct omfs_sb_info *sbi = OMFS_SB(sb);
266 kfree(sbi->s_imap); 269 kfree(sbi->s_imap);
267 kfree(sbi); 270 kfree(sbi);
268 sb->s_fs_info = NULL; 271 sb->s_fs_info = NULL;
269 } 272 }
270 273
271 static int omfs_statfs(struct dentry *dentry, 274 static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf)
272 { 275 {
273 struct super_block *s = dentry->d_sb; 276 struct super_block *s = dentry->d_sb;
274 struct omfs_sb_info *sbi = OMFS_SB(s); 277 struct omfs_sb_info *sbi = OMFS_SB(s);
275 u64 id = huge_encode_dev(s->s_bdev->bd 278 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
276 279
277 buf->f_type = OMFS_MAGIC; 280 buf->f_type = OMFS_MAGIC;
278 buf->f_bsize = sbi->s_blocksize; 281 buf->f_bsize = sbi->s_blocksize;
279 buf->f_blocks = sbi->s_num_blocks; 282 buf->f_blocks = sbi->s_num_blocks;
280 buf->f_files = sbi->s_num_blocks; 283 buf->f_files = sbi->s_num_blocks;
281 buf->f_namelen = OMFS_NAMELEN; 284 buf->f_namelen = OMFS_NAMELEN;
282 buf->f_fsid = u64_to_fsid(id); !! 285 buf->f_fsid.val[0] = (u32)id;
>> 286 buf->f_fsid.val[1] = (u32)(id >> 32);
283 287
284 buf->f_bfree = buf->f_bavail = buf->f_ 288 buf->f_bfree = buf->f_bavail = buf->f_ffree =
285 omfs_count_free(s); 289 omfs_count_free(s);
286 290
287 return 0; 291 return 0;
288 } 292 }
289 293
290 /* 294 /*
291 * Display the mount options in /proc/mounts. 295 * Display the mount options in /proc/mounts.
292 */ 296 */
293 static int omfs_show_options(struct seq_file * 297 static int omfs_show_options(struct seq_file *m, struct dentry *root)
294 { 298 {
295 struct omfs_sb_info *sbi = OMFS_SB(roo 299 struct omfs_sb_info *sbi = OMFS_SB(root->d_sb);
296 umode_t cur_umask = current_umask(); 300 umode_t cur_umask = current_umask();
297 301
298 if (!uid_eq(sbi->s_uid, current_uid()) 302 if (!uid_eq(sbi->s_uid, current_uid()))
299 seq_printf(m, ",uid=%u", 303 seq_printf(m, ",uid=%u",
300 from_kuid_munged(&i 304 from_kuid_munged(&init_user_ns, sbi->s_uid));
301 if (!gid_eq(sbi->s_gid, current_gid()) 305 if (!gid_eq(sbi->s_gid, current_gid()))
302 seq_printf(m, ",gid=%u", 306 seq_printf(m, ",gid=%u",
303 from_kgid_munged(&i 307 from_kgid_munged(&init_user_ns, sbi->s_gid));
304 308
305 if (sbi->s_dmask == sbi->s_fmask) { 309 if (sbi->s_dmask == sbi->s_fmask) {
306 if (sbi->s_fmask != cur_umask) 310 if (sbi->s_fmask != cur_umask)
307 seq_printf(m, ",umask= 311 seq_printf(m, ",umask=%o", sbi->s_fmask);
308 } else { 312 } else {
309 if (sbi->s_dmask != cur_umask) 313 if (sbi->s_dmask != cur_umask)
310 seq_printf(m, ",dmask= 314 seq_printf(m, ",dmask=%o", sbi->s_dmask);
311 if (sbi->s_fmask != cur_umask) 315 if (sbi->s_fmask != cur_umask)
312 seq_printf(m, ",fmask= 316 seq_printf(m, ",fmask=%o", sbi->s_fmask);
313 } 317 }
314 318
315 return 0; 319 return 0;
316 } 320 }
317 321
318 static const struct super_operations omfs_sops 322 static const struct super_operations omfs_sops = {
319 .write_inode = omfs_write_inode, 323 .write_inode = omfs_write_inode,
320 .evict_inode = omfs_evict_inode, 324 .evict_inode = omfs_evict_inode,
321 .put_super = omfs_put_super, 325 .put_super = omfs_put_super,
322 .statfs = omfs_statfs, 326 .statfs = omfs_statfs,
323 .show_options = omfs_show_options, 327 .show_options = omfs_show_options,
324 }; 328 };
325 329
326 /* 330 /*
327 * For Rio Karma, there is an on-disk free bit 331 * For Rio Karma, there is an on-disk free bitmap whose location is
328 * stored in the root block. For ReplayTV, th 332 * stored in the root block. For ReplayTV, there is no such free bitmap
329 * so we have to walk the tree. Both inodes a 333 * so we have to walk the tree. Both inodes and file data are allocated
330 * from the same map. This array can be big ( 334 * from the same map. This array can be big (300k) so we allocate
331 * in units of the blocksize. 335 * in units of the blocksize.
332 */ 336 */
333 static int omfs_get_imap(struct super_block *s 337 static int omfs_get_imap(struct super_block *sb)
334 { 338 {
335 unsigned int bitmap_size, array_size; 339 unsigned int bitmap_size, array_size;
336 int count; 340 int count;
337 struct omfs_sb_info *sbi = OMFS_SB(sb) 341 struct omfs_sb_info *sbi = OMFS_SB(sb);
338 struct buffer_head *bh; 342 struct buffer_head *bh;
339 unsigned long **ptr; 343 unsigned long **ptr;
340 sector_t block; 344 sector_t block;
341 345
342 bitmap_size = DIV_ROUND_UP(sbi->s_num_ 346 bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8);
343 array_size = DIV_ROUND_UP(bitmap_size, 347 array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);
344 348
345 if (sbi->s_bitmap_ino == ~0ULL) 349 if (sbi->s_bitmap_ino == ~0ULL)
346 goto out; 350 goto out;
347 351
348 sbi->s_imap_size = array_size; 352 sbi->s_imap_size = array_size;
349 sbi->s_imap = kcalloc(array_size, size 353 sbi->s_imap = kcalloc(array_size, sizeof(unsigned long *), GFP_KERNEL);
350 if (!sbi->s_imap) 354 if (!sbi->s_imap)
351 goto nomem; 355 goto nomem;
352 356
353 block = clus_to_blk(sbi, sbi->s_bitmap 357 block = clus_to_blk(sbi, sbi->s_bitmap_ino);
354 if (block >= sbi->s_num_blocks) 358 if (block >= sbi->s_num_blocks)
355 goto nomem; 359 goto nomem;
356 360
357 ptr = sbi->s_imap; 361 ptr = sbi->s_imap;
358 for (count = bitmap_size; count > 0; c 362 for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
359 bh = sb_bread(sb, block++); 363 bh = sb_bread(sb, block++);
360 if (!bh) 364 if (!bh)
361 goto nomem_free; 365 goto nomem_free;
362 *ptr = kmemdup(bh->b_data, sb- !! 366 *ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
363 if (!*ptr) { 367 if (!*ptr) {
364 brelse(bh); 368 brelse(bh);
365 goto nomem_free; 369 goto nomem_free;
366 } 370 }
>> 371 memcpy(*ptr, bh->b_data, sb->s_blocksize);
367 if (count < sb->s_blocksize) 372 if (count < sb->s_blocksize)
368 memset((void *)*ptr + 373 memset((void *)*ptr + count, 0xff,
369 sb->s_blocksiz 374 sb->s_blocksize - count);
370 brelse(bh); 375 brelse(bh);
371 ptr++; 376 ptr++;
372 } 377 }
373 out: 378 out:
374 return 0; 379 return 0;
375 380
376 nomem_free: 381 nomem_free:
377 for (count = 0; count < array_size; co 382 for (count = 0; count < array_size; count++)
378 kfree(sbi->s_imap[count]); 383 kfree(sbi->s_imap[count]);
379 384
380 kfree(sbi->s_imap); 385 kfree(sbi->s_imap);
381 nomem: 386 nomem:
382 sbi->s_imap = NULL; 387 sbi->s_imap = NULL;
383 sbi->s_imap_size = 0; 388 sbi->s_imap_size = 0;
384 return -ENOMEM; 389 return -ENOMEM;
385 } 390 }
386 391
387 enum { 392 enum {
388 Opt_uid, Opt_gid, Opt_umask, Opt_dmask 393 Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err
389 }; 394 };
390 395
391 static const match_table_t tokens = { 396 static const match_table_t tokens = {
392 {Opt_uid, "uid=%u"}, 397 {Opt_uid, "uid=%u"},
393 {Opt_gid, "gid=%u"}, 398 {Opt_gid, "gid=%u"},
394 {Opt_umask, "umask=%o"}, 399 {Opt_umask, "umask=%o"},
395 {Opt_dmask, "dmask=%o"}, 400 {Opt_dmask, "dmask=%o"},
396 {Opt_fmask, "fmask=%o"}, 401 {Opt_fmask, "fmask=%o"},
397 {Opt_err, NULL}, 402 {Opt_err, NULL},
398 }; 403 };
399 404
400 static int parse_options(char *options, struct 405 static int parse_options(char *options, struct omfs_sb_info *sbi)
401 { 406 {
402 char *p; 407 char *p;
403 substring_t args[MAX_OPT_ARGS]; 408 substring_t args[MAX_OPT_ARGS];
404 int option; 409 int option;
405 410
406 if (!options) 411 if (!options)
407 return 1; 412 return 1;
408 413
409 while ((p = strsep(&options, ",")) != 414 while ((p = strsep(&options, ",")) != NULL) {
410 int token; 415 int token;
411 if (!*p) 416 if (!*p)
412 continue; 417 continue;
413 418
414 token = match_token(p, tokens, 419 token = match_token(p, tokens, args);
415 switch (token) { 420 switch (token) {
416 case Opt_uid: 421 case Opt_uid:
417 if (match_int(&args[0] 422 if (match_int(&args[0], &option))
418 return 0; 423 return 0;
419 sbi->s_uid = make_kuid 424 sbi->s_uid = make_kuid(current_user_ns(), option);
420 if (!uid_valid(sbi->s_ 425 if (!uid_valid(sbi->s_uid))
421 return 0; 426 return 0;
422 break; 427 break;
423 case Opt_gid: 428 case Opt_gid:
424 if (match_int(&args[0] 429 if (match_int(&args[0], &option))
425 return 0; 430 return 0;
426 sbi->s_gid = make_kgid 431 sbi->s_gid = make_kgid(current_user_ns(), option);
427 if (!gid_valid(sbi->s_ 432 if (!gid_valid(sbi->s_gid))
428 return 0; 433 return 0;
429 break; 434 break;
430 case Opt_umask: 435 case Opt_umask:
431 if (match_octal(&args[ 436 if (match_octal(&args[0], &option))
432 return 0; 437 return 0;
433 sbi->s_fmask = sbi->s_ 438 sbi->s_fmask = sbi->s_dmask = option;
434 break; 439 break;
435 case Opt_dmask: 440 case Opt_dmask:
436 if (match_octal(&args[ 441 if (match_octal(&args[0], &option))
437 return 0; 442 return 0;
438 sbi->s_dmask = option; 443 sbi->s_dmask = option;
439 break; 444 break;
440 case Opt_fmask: 445 case Opt_fmask:
441 if (match_octal(&args[ 446 if (match_octal(&args[0], &option))
442 return 0; 447 return 0;
443 sbi->s_fmask = option; 448 sbi->s_fmask = option;
444 break; 449 break;
445 default: 450 default:
446 return 0; 451 return 0;
447 } 452 }
448 } 453 }
449 return 1; 454 return 1;
450 } 455 }
451 456
452 static int omfs_fill_super(struct super_block 457 static int omfs_fill_super(struct super_block *sb, void *data, int silent)
453 { 458 {
454 struct buffer_head *bh, *bh2; 459 struct buffer_head *bh, *bh2;
455 struct omfs_super_block *omfs_sb; 460 struct omfs_super_block *omfs_sb;
456 struct omfs_root_block *omfs_rb; 461 struct omfs_root_block *omfs_rb;
457 struct omfs_sb_info *sbi; 462 struct omfs_sb_info *sbi;
458 struct inode *root; 463 struct inode *root;
459 int ret = -EINVAL; 464 int ret = -EINVAL;
460 465
461 sbi = kzalloc(sizeof(struct omfs_sb_in 466 sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL);
462 if (!sbi) 467 if (!sbi)
463 return -ENOMEM; 468 return -ENOMEM;
464 469
465 sb->s_fs_info = sbi; 470 sb->s_fs_info = sbi;
466 471
467 sbi->s_uid = current_uid(); 472 sbi->s_uid = current_uid();
468 sbi->s_gid = current_gid(); 473 sbi->s_gid = current_gid();
469 sbi->s_dmask = sbi->s_fmask = current_ 474 sbi->s_dmask = sbi->s_fmask = current_umask();
470 475
471 if (!parse_options((char *) data, sbi) 476 if (!parse_options((char *) data, sbi))
472 goto end; 477 goto end;
473 478
474 sb->s_maxbytes = 0xffffffff; 479 sb->s_maxbytes = 0xffffffff;
475 <<
476 sb->s_time_gran = NSEC_PER_MSEC; <<
477 sb->s_time_min = 0; <<
478 sb->s_time_max = U64_MAX / MSEC_PER_SE <<
479 480
480 sb_set_blocksize(sb, 0x200); 481 sb_set_blocksize(sb, 0x200);
481 482
482 bh = sb_bread(sb, 0); 483 bh = sb_bread(sb, 0);
483 if (!bh) 484 if (!bh)
484 goto end; 485 goto end;
485 486
486 omfs_sb = (struct omfs_super_block *)b 487 omfs_sb = (struct omfs_super_block *)bh->b_data;
487 488
488 if (omfs_sb->s_magic != cpu_to_be32(OM 489 if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) {
489 if (!silent) 490 if (!silent)
490 printk(KERN_ERR "omfs: 491 printk(KERN_ERR "omfs: Invalid superblock (%x)\n",
491 omfs_sb->s_ 492 omfs_sb->s_magic);
492 goto out_brelse_bh; 493 goto out_brelse_bh;
493 } 494 }
494 sb->s_magic = OMFS_MAGIC; 495 sb->s_magic = OMFS_MAGIC;
495 496
496 sbi->s_num_blocks = be64_to_cpu(omfs_s 497 sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks);
497 sbi->s_blocksize = be32_to_cpu(omfs_sb 498 sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize);
498 sbi->s_mirrors = be32_to_cpu(omfs_sb-> 499 sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors);
499 sbi->s_root_ino = be64_to_cpu(omfs_sb- 500 sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block);
500 sbi->s_sys_blocksize = be32_to_cpu(omf 501 sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize);
501 mutex_init(&sbi->s_bitmap_lock); 502 mutex_init(&sbi->s_bitmap_lock);
502 503
503 if (sbi->s_num_blocks > OMFS_MAX_BLOCK 504 if (sbi->s_num_blocks > OMFS_MAX_BLOCKS) {
504 printk(KERN_ERR "omfs: sysbloc 505 printk(KERN_ERR "omfs: sysblock number (%llx) is out of range\n",
505 (unsigned long long)sbi 506 (unsigned long long)sbi->s_num_blocks);
506 goto out_brelse_bh; 507 goto out_brelse_bh;
507 } 508 }
508 509
509 if (sbi->s_sys_blocksize > PAGE_SIZE) 510 if (sbi->s_sys_blocksize > PAGE_SIZE) {
510 printk(KERN_ERR "omfs: sysbloc 511 printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n",
511 sbi->s_sys_blocksize); 512 sbi->s_sys_blocksize);
512 goto out_brelse_bh; 513 goto out_brelse_bh;
513 } 514 }
514 515
515 if (sbi->s_blocksize < sbi->s_sys_bloc 516 if (sbi->s_blocksize < sbi->s_sys_blocksize ||
516 sbi->s_blocksize > OMFS_MAX_BLOCK_ 517 sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) {
517 printk(KERN_ERR "omfs: block s 518 printk(KERN_ERR "omfs: block size (%d) is out of range\n",
518 sbi->s_blocksize); 519 sbi->s_blocksize);
519 goto out_brelse_bh; 520 goto out_brelse_bh;
520 } 521 }
521 522
522 /* 523 /*
523 * Use sys_blocksize as the fs block s 524 * Use sys_blocksize as the fs block since it is smaller than a
524 * page while the fs blocksize can be 525 * page while the fs blocksize can be larger.
525 */ 526 */
526 sb_set_blocksize(sb, sbi->s_sys_blocks 527 sb_set_blocksize(sb, sbi->s_sys_blocksize);
527 528
528 /* 529 /*
529 * ...and the difference goes into a s 530 * ...and the difference goes into a shift. sys_blocksize is always
530 * a power of two factor of blocksize. 531 * a power of two factor of blocksize.
531 */ 532 */
532 sbi->s_block_shift = get_bitmask_order 533 sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
533 get_bitmask_order(sbi->s_sys_b 534 get_bitmask_order(sbi->s_sys_blocksize);
534 535
535 bh2 = omfs_bread(sb, be64_to_cpu(omfs_ 536 bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block));
536 if (!bh2) 537 if (!bh2)
537 goto out_brelse_bh; 538 goto out_brelse_bh;
538 539
539 omfs_rb = (struct omfs_root_block *)bh 540 omfs_rb = (struct omfs_root_block *)bh2->b_data;
540 541
541 sbi->s_bitmap_ino = be64_to_cpu(omfs_r 542 sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap);
542 sbi->s_clustersize = be32_to_cpu(omfs_ 543 sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize);
543 544
544 if (sbi->s_num_blocks != be64_to_cpu(o 545 if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) {
545 printk(KERN_ERR "omfs: block c 546 printk(KERN_ERR "omfs: block count discrepancy between "
546 "super and root blocks 547 "super and root blocks (%llx, %llx)\n",
547 (unsigned long long)sb 548 (unsigned long long)sbi->s_num_blocks,
548 (unsigned long long)be 549 (unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks));
549 goto out_brelse_bh2; 550 goto out_brelse_bh2;
550 } 551 }
551 552
552 if (sbi->s_bitmap_ino != ~0ULL && 553 if (sbi->s_bitmap_ino != ~0ULL &&
553 sbi->s_bitmap_ino > sbi->s_num_blo 554 sbi->s_bitmap_ino > sbi->s_num_blocks) {
554 printk(KERN_ERR "omfs: free sp 555 printk(KERN_ERR "omfs: free space bitmap location is corrupt "
555 "(%llx, total blocks % 556 "(%llx, total blocks %llx)\n",
556 (unsigned long long) s 557 (unsigned long long) sbi->s_bitmap_ino,
557 (unsigned long long) s 558 (unsigned long long) sbi->s_num_blocks);
558 goto out_brelse_bh2; 559 goto out_brelse_bh2;
559 } 560 }
560 if (sbi->s_clustersize < 1 || 561 if (sbi->s_clustersize < 1 ||
561 sbi->s_clustersize > OMFS_MAX_CLUS 562 sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) {
562 printk(KERN_ERR "omfs: cluster 563 printk(KERN_ERR "omfs: cluster size out of range (%d)",
563 sbi->s_clustersize); 564 sbi->s_clustersize);
564 goto out_brelse_bh2; 565 goto out_brelse_bh2;
565 } 566 }
566 567
567 ret = omfs_get_imap(sb); 568 ret = omfs_get_imap(sb);
568 if (ret) 569 if (ret)
569 goto out_brelse_bh2; 570 goto out_brelse_bh2;
570 571
571 sb->s_op = &omfs_sops; 572 sb->s_op = &omfs_sops;
572 573
573 root = omfs_iget(sb, be64_to_cpu(omfs_ 574 root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir));
574 if (IS_ERR(root)) { 575 if (IS_ERR(root)) {
575 ret = PTR_ERR(root); 576 ret = PTR_ERR(root);
576 goto out_brelse_bh2; 577 goto out_brelse_bh2;
577 } 578 }
578 579
579 sb->s_root = d_make_root(root); 580 sb->s_root = d_make_root(root);
580 if (!sb->s_root) { 581 if (!sb->s_root) {
581 ret = -ENOMEM; 582 ret = -ENOMEM;
582 goto out_brelse_bh2; 583 goto out_brelse_bh2;
583 } 584 }
584 printk(KERN_DEBUG "omfs: Mounted volum 585 printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name);
585 586
586 ret = 0; 587 ret = 0;
587 out_brelse_bh2: 588 out_brelse_bh2:
588 brelse(bh2); 589 brelse(bh2);
589 out_brelse_bh: 590 out_brelse_bh:
590 brelse(bh); 591 brelse(bh);
591 end: 592 end:
592 if (ret) 593 if (ret)
593 kfree(sbi); 594 kfree(sbi);
594 return ret; 595 return ret;
595 } 596 }
596 597
597 static struct dentry *omfs_mount(struct file_s 598 static struct dentry *omfs_mount(struct file_system_type *fs_type,
598 int flags, const char 599 int flags, const char *dev_name, void *data)
599 { 600 {
600 return mount_bdev(fs_type, flags, dev_ 601 return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super);
601 } 602 }
602 603
603 static struct file_system_type omfs_fs_type = 604 static struct file_system_type omfs_fs_type = {
604 .owner = THIS_MODULE, 605 .owner = THIS_MODULE,
605 .name = "omfs", 606 .name = "omfs",
606 .mount = omfs_mount, 607 .mount = omfs_mount,
607 .kill_sb = kill_block_super, 608 .kill_sb = kill_block_super,
608 .fs_flags = FS_REQUIRES_DEV, 609 .fs_flags = FS_REQUIRES_DEV,
609 }; 610 };
610 MODULE_ALIAS_FS("omfs"); 611 MODULE_ALIAS_FS("omfs");
611 612
612 static int __init init_omfs_fs(void) 613 static int __init init_omfs_fs(void)
613 { 614 {
614 return register_filesystem(&omfs_fs_ty 615 return register_filesystem(&omfs_fs_type);
615 } 616 }
616 617
617 static void __exit exit_omfs_fs(void) 618 static void __exit exit_omfs_fs(void)
618 { 619 {
619 unregister_filesystem(&omfs_fs_type); 620 unregister_filesystem(&omfs_fs_type);
620 } 621 }
621 622
622 module_init(init_omfs_fs); 623 module_init(init_omfs_fs);
623 module_exit(exit_omfs_fs); 624 module_exit(exit_omfs_fs);
624 625
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