Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/minix/inode.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl) |
| 7 | * Minix V2 fs support. |
| 8 | * |
| 9 | * Modified for 680x0 by Andreas Schwab |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include "minix.h" |
| 14 | #include <linux/buffer_head.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/highuid.h> |
| 18 | #include <linux/vfs.h> |
| 19 | |
| 20 | static void minix_read_inode(struct inode * inode); |
| 21 | static int minix_write_inode(struct inode * inode, int wait); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 22 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | static int minix_remount (struct super_block * sb, int * flags, char * data); |
| 24 | |
| 25 | static void minix_delete_inode(struct inode *inode) |
| 26 | { |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 27 | truncate_inode_pages(&inode->i_data, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | inode->i_size = 0; |
| 29 | minix_truncate(inode); |
| 30 | minix_free_inode(inode); |
| 31 | } |
| 32 | |
| 33 | static void minix_put_super(struct super_block *sb) |
| 34 | { |
| 35 | int i; |
| 36 | struct minix_sb_info *sbi = minix_sb(sb); |
| 37 | |
| 38 | if (!(sb->s_flags & MS_RDONLY)) { |
| 39 | sbi->s_ms->s_state = sbi->s_mount_state; |
| 40 | mark_buffer_dirty(sbi->s_sbh); |
| 41 | } |
| 42 | for (i = 0; i < sbi->s_imap_blocks; i++) |
| 43 | brelse(sbi->s_imap[i]); |
| 44 | for (i = 0; i < sbi->s_zmap_blocks; i++) |
| 45 | brelse(sbi->s_zmap[i]); |
| 46 | brelse (sbi->s_sbh); |
| 47 | kfree(sbi->s_imap); |
| 48 | sb->s_fs_info = NULL; |
| 49 | kfree(sbi); |
| 50 | |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | static kmem_cache_t * minix_inode_cachep; |
| 55 | |
| 56 | static struct inode *minix_alloc_inode(struct super_block *sb) |
| 57 | { |
| 58 | struct minix_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 59 | ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | if (!ei) |
| 61 | return NULL; |
| 62 | return &ei->vfs_inode; |
| 63 | } |
| 64 | |
| 65 | static void minix_destroy_inode(struct inode *inode) |
| 66 | { |
| 67 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); |
| 68 | } |
| 69 | |
| 70 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| 71 | { |
| 72 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; |
| 73 | |
| 74 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 75 | SLAB_CTOR_CONSTRUCTOR) |
| 76 | inode_init_once(&ei->vfs_inode); |
| 77 | } |
| 78 | |
| 79 | static int init_inodecache(void) |
| 80 | { |
| 81 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", |
| 82 | sizeof(struct minix_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 83 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 84 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | init_once, NULL); |
| 86 | if (minix_inode_cachep == NULL) |
| 87 | return -ENOMEM; |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static void destroy_inodecache(void) |
| 92 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 93 | kmem_cache_destroy(minix_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static struct super_operations minix_sops = { |
| 97 | .alloc_inode = minix_alloc_inode, |
| 98 | .destroy_inode = minix_destroy_inode, |
| 99 | .read_inode = minix_read_inode, |
| 100 | .write_inode = minix_write_inode, |
| 101 | .delete_inode = minix_delete_inode, |
| 102 | .put_super = minix_put_super, |
| 103 | .statfs = minix_statfs, |
| 104 | .remount_fs = minix_remount, |
| 105 | }; |
| 106 | |
| 107 | static int minix_remount (struct super_block * sb, int * flags, char * data) |
| 108 | { |
| 109 | struct minix_sb_info * sbi = minix_sb(sb); |
| 110 | struct minix_super_block * ms; |
| 111 | |
| 112 | ms = sbi->s_ms; |
| 113 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 114 | return 0; |
| 115 | if (*flags & MS_RDONLY) { |
| 116 | if (ms->s_state & MINIX_VALID_FS || |
| 117 | !(sbi->s_mount_state & MINIX_VALID_FS)) |
| 118 | return 0; |
| 119 | /* Mounting a rw partition read-only. */ |
| 120 | ms->s_state = sbi->s_mount_state; |
| 121 | mark_buffer_dirty(sbi->s_sbh); |
| 122 | } else { |
| 123 | /* Mount a partition which is read-only, read-write. */ |
| 124 | sbi->s_mount_state = ms->s_state; |
| 125 | ms->s_state &= ~MINIX_VALID_FS; |
| 126 | mark_buffer_dirty(sbi->s_sbh); |
| 127 | |
| 128 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 129 | printk("MINIX-fs warning: remounting unchecked fs, " |
| 130 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 132 | printk("MINIX-fs warning: remounting fs with errors, " |
| 133 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int minix_fill_super(struct super_block *s, void *data, int silent) |
| 139 | { |
| 140 | struct buffer_head *bh; |
| 141 | struct buffer_head **map; |
| 142 | struct minix_super_block *ms; |
| 143 | int i, block; |
| 144 | struct inode *root_inode; |
| 145 | struct minix_sb_info *sbi; |
| 146 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 147 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (!sbi) |
| 149 | return -ENOMEM; |
| 150 | s->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Alexey Dobriyan | 2ecd05a | 2006-10-11 01:22:05 -0700 | [diff] [blame] | 152 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); |
| 153 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | if (!sb_set_blocksize(s, BLOCK_SIZE)) |
| 156 | goto out_bad_hblock; |
| 157 | |
| 158 | if (!(bh = sb_bread(s, 1))) |
| 159 | goto out_bad_sb; |
| 160 | |
| 161 | ms = (struct minix_super_block *) bh->b_data; |
| 162 | sbi->s_ms = ms; |
| 163 | sbi->s_sbh = bh; |
| 164 | sbi->s_mount_state = ms->s_state; |
| 165 | sbi->s_ninodes = ms->s_ninodes; |
| 166 | sbi->s_nzones = ms->s_nzones; |
| 167 | sbi->s_imap_blocks = ms->s_imap_blocks; |
| 168 | sbi->s_zmap_blocks = ms->s_zmap_blocks; |
| 169 | sbi->s_firstdatazone = ms->s_firstdatazone; |
| 170 | sbi->s_log_zone_size = ms->s_log_zone_size; |
| 171 | sbi->s_max_size = ms->s_max_size; |
| 172 | s->s_magic = ms->s_magic; |
| 173 | if (s->s_magic == MINIX_SUPER_MAGIC) { |
| 174 | sbi->s_version = MINIX_V1; |
| 175 | sbi->s_dirsize = 16; |
| 176 | sbi->s_namelen = 14; |
| 177 | sbi->s_link_max = MINIX_LINK_MAX; |
| 178 | } else if (s->s_magic == MINIX_SUPER_MAGIC2) { |
| 179 | sbi->s_version = MINIX_V1; |
| 180 | sbi->s_dirsize = 32; |
| 181 | sbi->s_namelen = 30; |
| 182 | sbi->s_link_max = MINIX_LINK_MAX; |
| 183 | } else if (s->s_magic == MINIX2_SUPER_MAGIC) { |
| 184 | sbi->s_version = MINIX_V2; |
| 185 | sbi->s_nzones = ms->s_zones; |
| 186 | sbi->s_dirsize = 16; |
| 187 | sbi->s_namelen = 14; |
| 188 | sbi->s_link_max = MINIX2_LINK_MAX; |
| 189 | } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { |
| 190 | sbi->s_version = MINIX_V2; |
| 191 | sbi->s_nzones = ms->s_zones; |
| 192 | sbi->s_dirsize = 32; |
| 193 | sbi->s_namelen = 30; |
| 194 | sbi->s_link_max = MINIX2_LINK_MAX; |
| 195 | } else |
| 196 | goto out_no_fs; |
| 197 | |
| 198 | /* |
| 199 | * Allocate the buffer map to keep the superblock small. |
| 200 | */ |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 201 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
| 202 | goto out_illegal_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 204 | map = kzalloc(i, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | if (!map) |
| 206 | goto out_no_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | sbi->s_imap = &map[0]; |
| 208 | sbi->s_zmap = &map[sbi->s_imap_blocks]; |
| 209 | |
| 210 | block=2; |
| 211 | for (i=0 ; i < sbi->s_imap_blocks ; i++) { |
| 212 | if (!(sbi->s_imap[i]=sb_bread(s, block))) |
| 213 | goto out_no_bitmap; |
| 214 | block++; |
| 215 | } |
| 216 | for (i=0 ; i < sbi->s_zmap_blocks ; i++) { |
| 217 | if (!(sbi->s_zmap[i]=sb_bread(s, block))) |
| 218 | goto out_no_bitmap; |
| 219 | block++; |
| 220 | } |
| 221 | |
| 222 | minix_set_bit(0,sbi->s_imap[0]->b_data); |
| 223 | minix_set_bit(0,sbi->s_zmap[0]->b_data); |
| 224 | |
| 225 | /* set up enough so that it can read an inode */ |
| 226 | s->s_op = &minix_sops; |
| 227 | root_inode = iget(s, MINIX_ROOT_INO); |
| 228 | if (!root_inode || is_bad_inode(root_inode)) |
| 229 | goto out_no_root; |
| 230 | |
| 231 | s->s_root = d_alloc_root(root_inode); |
| 232 | if (!s->s_root) |
| 233 | goto out_iput; |
| 234 | |
| 235 | if (!NO_TRUNCATE) |
| 236 | s->s_root->d_op = &minix_dentry_operations; |
| 237 | |
| 238 | if (!(s->s_flags & MS_RDONLY)) { |
| 239 | ms->s_state &= ~MINIX_VALID_FS; |
| 240 | mark_buffer_dirty(bh); |
| 241 | } |
| 242 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 243 | printk("MINIX-fs: mounting unchecked file system, " |
| 244 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | else if (sbi->s_mount_state & MINIX_ERROR_FS) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 246 | printk("MINIX-fs: mounting file system with errors, " |
| 247 | "running fsck is recommended\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | return 0; |
| 249 | |
| 250 | out_iput: |
| 251 | iput(root_inode); |
| 252 | goto out_freemap; |
| 253 | |
| 254 | out_no_root: |
| 255 | if (!silent) |
| 256 | printk("MINIX-fs: get root inode failed\n"); |
| 257 | goto out_freemap; |
| 258 | |
| 259 | out_no_bitmap: |
| 260 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 261 | out_freemap: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | for (i = 0; i < sbi->s_imap_blocks; i++) |
| 263 | brelse(sbi->s_imap[i]); |
| 264 | for (i = 0; i < sbi->s_zmap_blocks; i++) |
| 265 | brelse(sbi->s_zmap[i]); |
| 266 | kfree(sbi->s_imap); |
| 267 | goto out_release; |
| 268 | |
| 269 | out_no_map: |
| 270 | if (!silent) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 271 | printk("MINIX-fs: can't allocate map\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | goto out_release; |
| 273 | |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 274 | out_illegal_sb: |
| 275 | if (!silent) |
| 276 | printk("MINIX-fs: bad superblock\n"); |
| 277 | goto out_release; |
| 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | out_no_fs: |
| 280 | if (!silent) |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 281 | printk("VFS: Can't find a Minix or Minix V2 filesystem " |
| 282 | "on device %s\n", s->s_id); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 283 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | brelse(bh); |
| 285 | goto out; |
| 286 | |
| 287 | out_bad_hblock: |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 288 | printk("MINIX-fs: blocksize too small for device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | goto out; |
| 290 | |
| 291 | out_bad_sb: |
| 292 | printk("MINIX-fs: unable to read superblock\n"); |
Andries Brouwer | f5fb09f | 2006-08-27 01:23:42 -0700 | [diff] [blame] | 293 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | s->s_fs_info = NULL; |
| 295 | kfree(sbi); |
| 296 | return -EINVAL; |
| 297 | } |
| 298 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 299 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 301 | struct minix_sb_info *sbi = minix_sb(dentry->d_sb); |
| 302 | buf->f_type = dentry->d_sb->s_magic; |
| 303 | buf->f_bsize = dentry->d_sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; |
| 305 | buf->f_bfree = minix_count_free_blocks(sbi); |
| 306 | buf->f_bavail = buf->f_bfree; |
| 307 | buf->f_files = sbi->s_ninodes; |
| 308 | buf->f_ffree = minix_count_free_inodes(sbi); |
| 309 | buf->f_namelen = sbi->s_namelen; |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static int minix_get_block(struct inode *inode, sector_t block, |
| 314 | struct buffer_head *bh_result, int create) |
| 315 | { |
| 316 | if (INODE_VERSION(inode) == MINIX_V1) |
| 317 | return V1_minix_get_block(inode, block, bh_result, create); |
| 318 | else |
| 319 | return V2_minix_get_block(inode, block, bh_result, create); |
| 320 | } |
| 321 | |
| 322 | static int minix_writepage(struct page *page, struct writeback_control *wbc) |
| 323 | { |
| 324 | return block_write_full_page(page, minix_get_block, wbc); |
| 325 | } |
| 326 | static int minix_readpage(struct file *file, struct page *page) |
| 327 | { |
| 328 | return block_read_full_page(page,minix_get_block); |
| 329 | } |
| 330 | static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) |
| 331 | { |
| 332 | return block_prepare_write(page,from,to,minix_get_block); |
| 333 | } |
| 334 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) |
| 335 | { |
| 336 | return generic_block_bmap(mapping,block,minix_get_block); |
| 337 | } |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 338 | static const struct address_space_operations minix_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | .readpage = minix_readpage, |
| 340 | .writepage = minix_writepage, |
| 341 | .sync_page = block_sync_page, |
| 342 | .prepare_write = minix_prepare_write, |
| 343 | .commit_write = generic_commit_write, |
| 344 | .bmap = minix_bmap |
| 345 | }; |
| 346 | |
| 347 | static struct inode_operations minix_symlink_inode_operations = { |
| 348 | .readlink = generic_readlink, |
| 349 | .follow_link = page_follow_link_light, |
| 350 | .put_link = page_put_link, |
| 351 | .getattr = minix_getattr, |
| 352 | }; |
| 353 | |
| 354 | void minix_set_inode(struct inode *inode, dev_t rdev) |
| 355 | { |
| 356 | if (S_ISREG(inode->i_mode)) { |
| 357 | inode->i_op = &minix_file_inode_operations; |
| 358 | inode->i_fop = &minix_file_operations; |
| 359 | inode->i_mapping->a_ops = &minix_aops; |
| 360 | } else if (S_ISDIR(inode->i_mode)) { |
| 361 | inode->i_op = &minix_dir_inode_operations; |
| 362 | inode->i_fop = &minix_dir_operations; |
| 363 | inode->i_mapping->a_ops = &minix_aops; |
| 364 | } else if (S_ISLNK(inode->i_mode)) { |
| 365 | inode->i_op = &minix_symlink_inode_operations; |
| 366 | inode->i_mapping->a_ops = &minix_aops; |
| 367 | } else |
| 368 | init_special_inode(inode, inode->i_mode, rdev); |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * The minix V1 function to read an inode. |
| 373 | */ |
| 374 | static void V1_minix_read_inode(struct inode * inode) |
| 375 | { |
| 376 | struct buffer_head * bh; |
| 377 | struct minix_inode * raw_inode; |
| 378 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 379 | int i; |
| 380 | |
| 381 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 382 | if (!raw_inode) { |
| 383 | make_bad_inode(inode); |
| 384 | return; |
| 385 | } |
| 386 | inode->i_mode = raw_inode->i_mode; |
| 387 | inode->i_uid = (uid_t)raw_inode->i_uid; |
| 388 | inode->i_gid = (gid_t)raw_inode->i_gid; |
| 389 | inode->i_nlink = raw_inode->i_nlinks; |
| 390 | inode->i_size = raw_inode->i_size; |
| 391 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; |
| 392 | inode->i_mtime.tv_nsec = 0; |
| 393 | inode->i_atime.tv_nsec = 0; |
| 394 | inode->i_ctime.tv_nsec = 0; |
Theodore Ts'o | ba52de1 | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 395 | inode->i_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | for (i = 0; i < 9; i++) |
| 397 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; |
| 398 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); |
| 399 | brelse(bh); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * The minix V2 function to read an inode. |
| 404 | */ |
| 405 | static void V2_minix_read_inode(struct inode * inode) |
| 406 | { |
| 407 | struct buffer_head * bh; |
| 408 | struct minix2_inode * raw_inode; |
| 409 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 410 | int i; |
| 411 | |
| 412 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 413 | if (!raw_inode) { |
| 414 | make_bad_inode(inode); |
| 415 | return; |
| 416 | } |
| 417 | inode->i_mode = raw_inode->i_mode; |
| 418 | inode->i_uid = (uid_t)raw_inode->i_uid; |
| 419 | inode->i_gid = (gid_t)raw_inode->i_gid; |
| 420 | inode->i_nlink = raw_inode->i_nlinks; |
| 421 | inode->i_size = raw_inode->i_size; |
| 422 | inode->i_mtime.tv_sec = raw_inode->i_mtime; |
| 423 | inode->i_atime.tv_sec = raw_inode->i_atime; |
| 424 | inode->i_ctime.tv_sec = raw_inode->i_ctime; |
| 425 | inode->i_mtime.tv_nsec = 0; |
| 426 | inode->i_atime.tv_nsec = 0; |
| 427 | inode->i_ctime.tv_nsec = 0; |
Theodore Ts'o | ba52de1 | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 428 | inode->i_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | for (i = 0; i < 10; i++) |
| 430 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; |
| 431 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); |
| 432 | brelse(bh); |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * The global function to read an inode. |
| 437 | */ |
| 438 | static void minix_read_inode(struct inode * inode) |
| 439 | { |
| 440 | if (INODE_VERSION(inode) == MINIX_V1) |
| 441 | V1_minix_read_inode(inode); |
| 442 | else |
| 443 | V2_minix_read_inode(inode); |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * The minix V1 function to synchronize an inode. |
| 448 | */ |
| 449 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) |
| 450 | { |
| 451 | struct buffer_head * bh; |
| 452 | struct minix_inode * raw_inode; |
| 453 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 454 | int i; |
| 455 | |
| 456 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 457 | if (!raw_inode) |
| 458 | return NULL; |
| 459 | raw_inode->i_mode = inode->i_mode; |
| 460 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); |
| 461 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); |
| 462 | raw_inode->i_nlinks = inode->i_nlink; |
| 463 | raw_inode->i_size = inode->i_size; |
| 464 | raw_inode->i_time = inode->i_mtime.tv_sec; |
| 465 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| 466 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); |
| 467 | else for (i = 0; i < 9; i++) |
| 468 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; |
| 469 | mark_buffer_dirty(bh); |
| 470 | return bh; |
| 471 | } |
| 472 | |
| 473 | /* |
| 474 | * The minix V2 function to synchronize an inode. |
| 475 | */ |
| 476 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) |
| 477 | { |
| 478 | struct buffer_head * bh; |
| 479 | struct minix2_inode * raw_inode; |
| 480 | struct minix_inode_info *minix_inode = minix_i(inode); |
| 481 | int i; |
| 482 | |
| 483 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); |
| 484 | if (!raw_inode) |
| 485 | return NULL; |
| 486 | raw_inode->i_mode = inode->i_mode; |
| 487 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); |
| 488 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); |
| 489 | raw_inode->i_nlinks = inode->i_nlink; |
| 490 | raw_inode->i_size = inode->i_size; |
| 491 | raw_inode->i_mtime = inode->i_mtime.tv_sec; |
| 492 | raw_inode->i_atime = inode->i_atime.tv_sec; |
| 493 | raw_inode->i_ctime = inode->i_ctime.tv_sec; |
| 494 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| 495 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); |
| 496 | else for (i = 0; i < 10; i++) |
| 497 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; |
| 498 | mark_buffer_dirty(bh); |
| 499 | return bh; |
| 500 | } |
| 501 | |
| 502 | static struct buffer_head *minix_update_inode(struct inode *inode) |
| 503 | { |
| 504 | if (INODE_VERSION(inode) == MINIX_V1) |
| 505 | return V1_minix_update_inode(inode); |
| 506 | else |
| 507 | return V2_minix_update_inode(inode); |
| 508 | } |
| 509 | |
| 510 | static int minix_write_inode(struct inode * inode, int wait) |
| 511 | { |
| 512 | brelse(minix_update_inode(inode)); |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | int minix_sync_inode(struct inode * inode) |
| 517 | { |
| 518 | int err = 0; |
| 519 | struct buffer_head *bh; |
| 520 | |
| 521 | bh = minix_update_inode(inode); |
| 522 | if (bh && buffer_dirty(bh)) |
| 523 | { |
| 524 | sync_dirty_buffer(bh); |
| 525 | if (buffer_req(bh) && !buffer_uptodate(bh)) |
| 526 | { |
Denis Vlasenko | 11b8448 | 2006-03-25 03:07:42 -0800 | [diff] [blame] | 527 | printk("IO error syncing minix inode [%s:%08lx]\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | inode->i_sb->s_id, inode->i_ino); |
| 529 | err = -1; |
| 530 | } |
| 531 | } |
| 532 | else if (!bh) |
| 533 | err = -1; |
| 534 | brelse (bh); |
| 535 | return err; |
| 536 | } |
| 537 | |
| 538 | int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 539 | { |
| 540 | generic_fillattr(dentry->d_inode, stat); |
| 541 | if (INODE_VERSION(dentry->d_inode) == MINIX_V1) |
| 542 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size); |
| 543 | else |
| 544 | stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size); |
| 545 | stat->blksize = BLOCK_SIZE; |
| 546 | return 0; |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * The function that is called for file truncation. |
| 551 | */ |
| 552 | void minix_truncate(struct inode * inode) |
| 553 | { |
| 554 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) |
| 555 | return; |
| 556 | if (INODE_VERSION(inode) == MINIX_V1) |
| 557 | V1_minix_truncate(inode); |
| 558 | else |
| 559 | V2_minix_truncate(inode); |
| 560 | } |
| 561 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 562 | static int minix_get_sb(struct file_system_type *fs_type, |
| 563 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 565 | return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super, |
| 566 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | static struct file_system_type minix_fs_type = { |
| 570 | .owner = THIS_MODULE, |
| 571 | .name = "minix", |
| 572 | .get_sb = minix_get_sb, |
| 573 | .kill_sb = kill_block_super, |
| 574 | .fs_flags = FS_REQUIRES_DEV, |
| 575 | }; |
| 576 | |
| 577 | static int __init init_minix_fs(void) |
| 578 | { |
| 579 | int err = init_inodecache(); |
| 580 | if (err) |
| 581 | goto out1; |
| 582 | err = register_filesystem(&minix_fs_type); |
| 583 | if (err) |
| 584 | goto out; |
| 585 | return 0; |
| 586 | out: |
| 587 | destroy_inodecache(); |
| 588 | out1: |
| 589 | return err; |
| 590 | } |
| 591 | |
| 592 | static void __exit exit_minix_fs(void) |
| 593 | { |
| 594 | unregister_filesystem(&minix_fs_type); |
| 595 | destroy_inodecache(); |
| 596 | } |
| 597 | |
| 598 | module_init(init_minix_fs) |
| 599 | module_exit(exit_minix_fs) |
| 600 | MODULE_LICENSE("GPL"); |
| 601 | |