1 /* 2 * linux/fs/hpfs/inode.c 3 * 4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 5 * 6 * inode VFS functions 7 */ 8 9 #include <linux/smp_lock.h> 10 #include <linux/slab.h> 11 #include "hpfs_fn.h" 12 13 void hpfs_init_inode(struct inode *i) 14 { 15 struct super_block *sb = i->i_sb; 16 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 17 18 i->i_uid = hpfs_sb(sb)->sb_uid; 19 i->i_gid = hpfs_sb(sb)->sb_gid; 20 i->i_mode = hpfs_sb(sb)->sb_mode; 21 hpfs_inode->i_conv = hpfs_sb(sb)->sb_conv; 22 i->i_size = -1; 23 i->i_blocks = -1; 24 25 hpfs_inode->i_dno = 0; 26 hpfs_inode->i_n_secs = 0; 27 hpfs_inode->i_file_sec = 0; 28 hpfs_inode->i_disk_sec = 0; 29 hpfs_inode->i_dpos = 0; 30 hpfs_inode->i_dsubdno = 0; 31 hpfs_inode->i_ea_mode = 0; 32 hpfs_inode->i_ea_uid = 0; 33 hpfs_inode->i_ea_gid = 0; 34 hpfs_inode->i_ea_size = 0; 35 36 hpfs_inode->i_rddir_off = NULL; 37 hpfs_inode->i_dirty = 0; 38 39 i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0; 40 i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0; 41 i->i_atime.tv_sec = i->i_atime.tv_nsec = 0; 42 } 43 44 void hpfs_read_inode(struct inode *i) 45 { 46 struct buffer_head *bh; 47 struct fnode *fnode; 48 struct super_block *sb = i->i_sb; 49 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 50 void *ea; 51 int ea_size; 52 53 if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) { 54 /*i->i_mode |= S_IFREG; 55 i->i_mode &= ~0111; 56 i->i_op = &hpfs_file_iops; 57 i->i_fop = &hpfs_file_ops; 58 i->i_nlink = 0;*/ 59 make_bad_inode(i); 60 return; 61 } 62 if (hpfs_sb(i->i_sb)->sb_eas) { 63 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) { 64 if (ea_size == 2) { 65 i->i_uid = le16_to_cpu(*(__le16*)ea); 66 hpfs_inode->i_ea_uid = 1; 67 } 68 kfree(ea); 69 } 70 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) { 71 if (ea_size == 2) { 72 i->i_gid = le16_to_cpu(*(__le16*)ea); 73 hpfs_inode->i_ea_gid = 1; 74 } 75 kfree(ea); 76 } 77 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) { 78 kfree(ea); 79 i->i_mode = S_IFLNK | 0777; 80 i->i_op = &page_symlink_inode_operations; 81 i->i_data.a_ops = &hpfs_symlink_aops; 82 i->i_nlink = 1; 83 i->i_size = ea_size; 84 i->i_blocks = 1; 85 brelse(bh); 86 return; 87 } 88 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) { 89 int rdev = 0; 90 umode_t mode = hpfs_sb(sb)->sb_mode; 91 if (ea_size == 2) { 92 mode = le16_to_cpu(*(__le16*)ea); 93 hpfs_inode->i_ea_mode = 1; 94 } 95 kfree(ea); 96 i->i_mode = mode; 97 if (S_ISBLK(mode) || S_ISCHR(mode)) { 98 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) { 99 if (ea_size == 4) 100 rdev = le32_to_cpu(*(__le32*)ea); 101 kfree(ea); 102 } 103 } 104 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 105 brelse(bh); 106 i->i_nlink = 1; 107 i->i_size = 0; 108 i->i_blocks = 1; 109 init_special_inode(i, mode, 110 new_decode_dev(rdev)); 111 return; 112 } 113 } 114 } 115 if (fnode->dirflag) { 116 int n_dnodes, n_subdirs; 117 i->i_mode |= S_IFDIR; 118 i->i_op = &hpfs_dir_iops; 119 i->i_fop = &hpfs_dir_ops; 120 hpfs_inode->i_parent_dir = fnode->up; 121 hpfs_inode->i_dno = fnode->u.external[0].disk_secno; 122 if (hpfs_sb(sb)->sb_chk >= 2) { 123 struct buffer_head *bh0; 124 if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0); 125 } 126 n_dnodes = 0; n_subdirs = 0; 127 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL); 128 i->i_blocks = 4 * n_dnodes; 129 i->i_size = 2048 * n_dnodes; 130 i->i_nlink = 2 + n_subdirs; 131 } else { 132 i->i_mode |= S_IFREG; 133 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111; 134 i->i_op = &hpfs_file_iops; 135 i->i_fop = &hpfs_file_ops; 136 i->i_nlink = 1; 137 i->i_size = fnode->file_size; 138 i->i_blocks = ((i->i_size + 511) >> 9) + 1; 139 i->i_data.a_ops = &hpfs_aops; 140 hpfs_i(i)->mmu_private = i->i_size; 141 } 142 brelse(bh); 143 } 144 145 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode) 146 { 147 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 148 /*if (fnode->acl_size_l || fnode->acl_size_s) { 149 Some unknown structures like ACL may be in fnode, 150 we'd better not overwrite them 151 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino); 152 } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { 153 __le32 ea; 154 if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { 155 ea = cpu_to_le32(i->i_uid); 156 hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); 157 hpfs_inode->i_ea_uid = 1; 158 } 159 if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { 160 ea = cpu_to_le32(i->i_gid); 161 hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2); 162 hpfs_inode->i_ea_gid = 1; 163 } 164 if (!S_ISLNK(i->i_mode)) 165 if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111)) 166 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG)) 167 && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333)) 168 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) { 169 ea = cpu_to_le32(i->i_mode); 170 /* sick, but legal */ 171 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2); 172 hpfs_inode->i_ea_mode = 1; 173 } 174 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) { 175 ea = cpu_to_le32(new_encode_dev(i->i_rdev)); 176 hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4); 177 } 178 } 179 } 180 181 void hpfs_write_inode(struct inode *i) 182 { 183 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 184 struct inode *parent; 185 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; 186 if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) { 187 if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n"); 188 kfree(hpfs_inode->i_rddir_off); 189 hpfs_inode->i_rddir_off = NULL; 190 } 191 mutex_lock(&hpfs_inode->i_parent_mutex); 192 if (!i->i_nlink) { 193 mutex_unlock(&hpfs_inode->i_parent_mutex); 194 return; 195 } 196 parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); 197 if (parent) { 198 hpfs_inode->i_dirty = 0; 199 if (parent->i_state & I_NEW) { 200 hpfs_init_inode(parent); 201 hpfs_read_inode(parent); 202 unlock_new_inode(parent); 203 } 204 mutex_lock(&hpfs_inode->i_mutex); 205 hpfs_write_inode_nolock(i); 206 mutex_unlock(&hpfs_inode->i_mutex); 207 iput(parent); 208 } else { 209 mark_inode_dirty(i); 210 } 211 mutex_unlock(&hpfs_inode->i_parent_mutex); 212 } 213 214 void hpfs_write_inode_nolock(struct inode *i) 215 { 216 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 217 struct buffer_head *bh; 218 struct fnode *fnode; 219 struct quad_buffer_head qbh; 220 struct hpfs_dirent *de; 221 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; 222 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; 223 if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { 224 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { 225 brelse(bh); 226 return; 227 } 228 } else de = NULL; 229 if (S_ISREG(i->i_mode)) { 230 fnode->file_size = i->i_size; 231 if (de) de->file_size = i->i_size; 232 } else if (S_ISDIR(i->i_mode)) { 233 fnode->file_size = 0; 234 if (de) de->file_size = 0; 235 } 236 hpfs_write_inode_ea(i, fnode); 237 if (de) { 238 de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec); 239 de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec); 240 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec); 241 de->read_only = !(i->i_mode & 0222); 242 de->ea_size = hpfs_inode->i_ea_size; 243 hpfs_mark_4buffers_dirty(&qbh); 244 hpfs_brelse4(&qbh); 245 } 246 if (S_ISDIR(i->i_mode)) { 247 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { 248 de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec); 249 de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec); 250 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec); 251 de->read_only = !(i->i_mode & 0222); 252 de->ea_size = /*hpfs_inode->i_ea_size*/0; 253 de->file_size = 0; 254 hpfs_mark_4buffers_dirty(&qbh); 255 hpfs_brelse4(&qbh); 256 } else 257 hpfs_error(i->i_sb, 258 "directory %08lx doesn't have '.' entry", 259 (unsigned long)i->i_ino); 260 } 261 mark_buffer_dirty(bh); 262 brelse(bh); 263 } 264 265 int hpfs_setattr(struct dentry *dentry, struct iattr *attr) 266 { 267 struct inode *inode = dentry->d_inode; 268 int error = -EINVAL; 269 270 lock_kernel(); 271 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) 272 goto out_unlock; 273 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) 274 goto out_unlock; 275 276 error = inode_change_ok(inode, attr); 277 if (error) 278 goto out_unlock; 279 280 error = inode_setattr(inode, attr); 281 if (error) 282 goto out_unlock; 283 284 hpfs_write_inode(inode); 285 286 out_unlock: 287 unlock_kernel(); 288 return error; 289 } 290 291 void hpfs_write_if_changed(struct inode *inode) 292 { 293 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 294 295 if (hpfs_inode->i_dirty) 296 hpfs_write_inode(inode); 297 } 298 299 void hpfs_delete_inode(struct inode *inode) 300 { 301 truncate_inode_pages(&inode->i_data, 0); 302 lock_kernel(); 303 hpfs_remove_fnode(inode->i_sb, inode->i_ino); 304 unlock_kernel(); 305 clear_inode(inode); 306 } 307