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/slab.h> 10 #include <linux/user_namespace.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 i->i_size = -1; 22 i->i_blocks = -1; 23 24 hpfs_inode->i_dno = 0; 25 hpfs_inode->i_n_secs = 0; 26 hpfs_inode->i_file_sec = 0; 27 hpfs_inode->i_disk_sec = 0; 28 hpfs_inode->i_dpos = 0; 29 hpfs_inode->i_dsubdno = 0; 30 hpfs_inode->i_ea_mode = 0; 31 hpfs_inode->i_ea_uid = 0; 32 hpfs_inode->i_ea_gid = 0; 33 hpfs_inode->i_ea_size = 0; 34 35 hpfs_inode->i_rddir_off = NULL; 36 hpfs_inode->i_dirty = 0; 37 38 i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0; 39 i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0; 40 i->i_atime.tv_sec = i->i_atime.tv_nsec = 0; 41 } 42 43 void hpfs_read_inode(struct inode *i) 44 { 45 struct buffer_head *bh; 46 struct fnode *fnode; 47 struct super_block *sb = i->i_sb; 48 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 49 void *ea; 50 int ea_size; 51 52 if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) { 53 /*i->i_mode |= S_IFREG; 54 i->i_mode &= ~0111; 55 i->i_op = &hpfs_file_iops; 56 i->i_fop = &hpfs_file_ops; 57 clear_nlink(i);*/ 58 make_bad_inode(i); 59 return; 60 } 61 if (hpfs_sb(i->i_sb)->sb_eas) { 62 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) { 63 if (ea_size == 2) { 64 i_uid_write(i, le16_to_cpu(*(__le16*)ea)); 65 hpfs_inode->i_ea_uid = 1; 66 } 67 kfree(ea); 68 } 69 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) { 70 if (ea_size == 2) { 71 i_gid_write(i, le16_to_cpu(*(__le16*)ea)); 72 hpfs_inode->i_ea_gid = 1; 73 } 74 kfree(ea); 75 } 76 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) { 77 kfree(ea); 78 i->i_mode = S_IFLNK | 0777; 79 i->i_op = &page_symlink_inode_operations; 80 i->i_data.a_ops = &hpfs_symlink_aops; 81 set_nlink(i, 1); 82 i->i_size = ea_size; 83 i->i_blocks = 1; 84 brelse(bh); 85 return; 86 } 87 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) { 88 int rdev = 0; 89 umode_t mode = hpfs_sb(sb)->sb_mode; 90 if (ea_size == 2) { 91 mode = le16_to_cpu(*(__le16*)ea); 92 hpfs_inode->i_ea_mode = 1; 93 } 94 kfree(ea); 95 i->i_mode = mode; 96 if (S_ISBLK(mode) || S_ISCHR(mode)) { 97 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) { 98 if (ea_size == 4) 99 rdev = le32_to_cpu(*(__le32*)ea); 100 kfree(ea); 101 } 102 } 103 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 104 brelse(bh); 105 set_nlink(i, 1); 106 i->i_size = 0; 107 i->i_blocks = 1; 108 init_special_inode(i, mode, 109 new_decode_dev(rdev)); 110 return; 111 } 112 } 113 } 114 if (fnode_is_dir(fnode)) { 115 int n_dnodes, n_subdirs; 116 i->i_mode |= S_IFDIR; 117 i->i_op = &hpfs_dir_iops; 118 i->i_fop = &hpfs_dir_ops; 119 hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up); 120 hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno); 121 if (hpfs_sb(sb)->sb_chk >= 2) { 122 struct buffer_head *bh0; 123 if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0); 124 } 125 n_dnodes = 0; n_subdirs = 0; 126 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL); 127 i->i_blocks = 4 * n_dnodes; 128 i->i_size = 2048 * n_dnodes; 129 set_nlink(i, 2 + n_subdirs); 130 } else { 131 i->i_mode |= S_IFREG; 132 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111; 133 i->i_op = &hpfs_file_iops; 134 i->i_fop = &hpfs_file_ops; 135 set_nlink(i, 1); 136 i->i_size = le32_to_cpu(fnode->file_size); 137 i->i_blocks = ((i->i_size + 511) >> 9) + 1; 138 i->i_data.a_ops = &hpfs_aops; 139 hpfs_i(i)->mmu_private = i->i_size; 140 } 141 brelse(bh); 142 } 143 144 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode) 145 { 146 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 147 /*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) { 148 Some unknown structures like ACL may be in fnode, 149 we'd better not overwrite them 150 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino); 151 } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { 152 __le32 ea; 153 if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { 154 ea = cpu_to_le32(i_uid_read(i)); 155 hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); 156 hpfs_inode->i_ea_uid = 1; 157 } 158 if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { 159 ea = cpu_to_le32(i_gid_read(i)); 160 hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2); 161 hpfs_inode->i_ea_gid = 1; 162 } 163 if (!S_ISLNK(i->i_mode)) 164 if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111)) 165 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG)) 166 && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333)) 167 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) { 168 ea = cpu_to_le32(i->i_mode); 169 /* sick, but legal */ 170 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2); 171 hpfs_inode->i_ea_mode = 1; 172 } 173 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) { 174 ea = cpu_to_le32(new_encode_dev(i->i_rdev)); 175 hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4); 176 } 177 } 178 } 179 180 void hpfs_write_inode(struct inode *i) 181 { 182 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 183 struct inode *parent; 184 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; 185 if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) { 186 if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n"); 187 kfree(hpfs_inode->i_rddir_off); 188 hpfs_inode->i_rddir_off = NULL; 189 } 190 if (!i->i_nlink) { 191 return; 192 } 193 parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); 194 if (parent) { 195 hpfs_inode->i_dirty = 0; 196 if (parent->i_state & I_NEW) { 197 hpfs_init_inode(parent); 198 hpfs_read_inode(parent); 199 unlock_new_inode(parent); 200 } 201 hpfs_write_inode_nolock(i); 202 iput(parent); 203 } 204 } 205 206 void hpfs_write_inode_nolock(struct inode *i) 207 { 208 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 209 struct buffer_head *bh; 210 struct fnode *fnode; 211 struct quad_buffer_head qbh; 212 struct hpfs_dirent *de; 213 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; 214 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; 215 if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { 216 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { 217 brelse(bh); 218 return; 219 } 220 } else de = NULL; 221 if (S_ISREG(i->i_mode)) { 222 fnode->file_size = cpu_to_le32(i->i_size); 223 if (de) de->file_size = cpu_to_le32(i->i_size); 224 } else if (S_ISDIR(i->i_mode)) { 225 fnode->file_size = cpu_to_le32(0); 226 if (de) de->file_size = cpu_to_le32(0); 227 } 228 hpfs_write_inode_ea(i, fnode); 229 if (de) { 230 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); 231 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); 232 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); 233 de->read_only = !(i->i_mode & 0222); 234 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size); 235 hpfs_mark_4buffers_dirty(&qbh); 236 hpfs_brelse4(&qbh); 237 } 238 if (S_ISDIR(i->i_mode)) { 239 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { 240 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); 241 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); 242 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); 243 de->read_only = !(i->i_mode & 0222); 244 de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0); 245 de->file_size = cpu_to_le32(0); 246 hpfs_mark_4buffers_dirty(&qbh); 247 hpfs_brelse4(&qbh); 248 } else 249 hpfs_error(i->i_sb, 250 "directory %08lx doesn't have '.' entry", 251 (unsigned long)i->i_ino); 252 } 253 mark_buffer_dirty(bh); 254 brelse(bh); 255 } 256 257 int hpfs_setattr(struct dentry *dentry, struct iattr *attr) 258 { 259 struct inode *inode = dentry->d_inode; 260 int error = -EINVAL; 261 262 hpfs_lock(inode->i_sb); 263 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) 264 goto out_unlock; 265 if ((attr->ia_valid & ATTR_UID) && 266 from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000) 267 goto out_unlock; 268 if ((attr->ia_valid & ATTR_GID) && 269 from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000) 270 goto out_unlock; 271 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) 272 goto out_unlock; 273 274 error = inode_change_ok(inode, attr); 275 if (error) 276 goto out_unlock; 277 278 if ((attr->ia_valid & ATTR_SIZE) && 279 attr->ia_size != i_size_read(inode)) { 280 error = vmtruncate(inode, attr->ia_size); 281 if (error) 282 goto out_unlock; 283 } 284 285 setattr_copy(inode, attr); 286 287 hpfs_write_inode(inode); 288 289 out_unlock: 290 hpfs_unlock(inode->i_sb); 291 return error; 292 } 293 294 void hpfs_write_if_changed(struct inode *inode) 295 { 296 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 297 298 if (hpfs_inode->i_dirty) 299 hpfs_write_inode(inode); 300 } 301 302 void hpfs_evict_inode(struct inode *inode) 303 { 304 truncate_inode_pages(&inode->i_data, 0); 305 clear_inode(inode); 306 if (!inode->i_nlink) { 307 hpfs_lock(inode->i_sb); 308 hpfs_remove_fnode(inode->i_sb, inode->i_ino); 309 hpfs_unlock(inode->i_sb); 310 } 311 } 312