| 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 | inode_nohighmem(i); |
| 81 | i->i_data.a_ops = &hpfs_symlink_aops; |
| 82 | set_nlink(i, 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 | set_nlink(i, 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_is_dir(fnode)) { |
| 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 = le32_to_cpu(fnode->up); |
| 121 | hpfs_inode->i_dno = le32_to_cpu(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 | set_nlink(i, 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 | set_nlink(i, 1); |
| 137 | i->i_size = le32_to_cpu(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 (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(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 structures", i->i_ino); |
| 152 | } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { |
| 153 | __le32 ea; |
| 154 | if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { |
| 155 | ea = cpu_to_le32(i_uid_read(i)); |
| 156 | hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); |
| 157 | hpfs_inode->i_ea_uid = 1; |
| 158 | } |
| 159 | if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { |
| 160 | ea = cpu_to_le32(i_gid_read(i)); |
| 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) |
| 188 | pr_err("write_inode: some position still there\n"); |
| 189 | kfree(hpfs_inode->i_rddir_off); |
| 190 | hpfs_inode->i_rddir_off = NULL; |
| 191 | } |
| 192 | if (!i->i_nlink) { |
| 193 | return; |
| 194 | } |
| 195 | parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); |
| 196 | if (parent) { |
| 197 | hpfs_inode->i_dirty = 0; |
| 198 | if (parent->i_state & I_NEW) { |
| 199 | hpfs_init_inode(parent); |
| 200 | hpfs_read_inode(parent); |
| 201 | unlock_new_inode(parent); |
| 202 | } |
| 203 | hpfs_write_inode_nolock(i); |
| 204 | iput(parent); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | void hpfs_write_inode_nolock(struct inode *i) |
| 209 | { |
| 210 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
| 211 | struct buffer_head *bh; |
| 212 | struct fnode *fnode; |
| 213 | struct quad_buffer_head qbh; |
| 214 | struct hpfs_dirent *de; |
| 215 | if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; |
| 216 | if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; |
| 217 | if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { |
| 218 | if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { |
| 219 | brelse(bh); |
| 220 | return; |
| 221 | } |
| 222 | } else de = NULL; |
| 223 | if (S_ISREG(i->i_mode)) { |
| 224 | fnode->file_size = cpu_to_le32(i->i_size); |
| 225 | if (de) de->file_size = cpu_to_le32(i->i_size); |
| 226 | } else if (S_ISDIR(i->i_mode)) { |
| 227 | fnode->file_size = cpu_to_le32(0); |
| 228 | if (de) de->file_size = cpu_to_le32(0); |
| 229 | } |
| 230 | hpfs_write_inode_ea(i, fnode); |
| 231 | if (de) { |
| 232 | de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); |
| 233 | de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); |
| 234 | de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); |
| 235 | de->read_only = !(i->i_mode & 0222); |
| 236 | de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size); |
| 237 | hpfs_mark_4buffers_dirty(&qbh); |
| 238 | hpfs_brelse4(&qbh); |
| 239 | } |
| 240 | if (S_ISDIR(i->i_mode)) { |
| 241 | if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { |
| 242 | de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); |
| 243 | de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); |
| 244 | de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); |
| 245 | de->read_only = !(i->i_mode & 0222); |
| 246 | de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0); |
| 247 | de->file_size = cpu_to_le32(0); |
| 248 | hpfs_mark_4buffers_dirty(&qbh); |
| 249 | hpfs_brelse4(&qbh); |
| 250 | } else |
| 251 | hpfs_error(i->i_sb, |
| 252 | "directory %08lx doesn't have '.' entry", |
| 253 | (unsigned long)i->i_ino); |
| 254 | } |
| 255 | mark_buffer_dirty(bh); |
| 256 | brelse(bh); |
| 257 | } |
| 258 | |
| 259 | int hpfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 260 | { |
| 261 | struct inode *inode = d_inode(dentry); |
| 262 | int error = -EINVAL; |
| 263 | |
| 264 | hpfs_lock(inode->i_sb); |
| 265 | if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) |
| 266 | goto out_unlock; |
| 267 | if ((attr->ia_valid & ATTR_UID) && |
| 268 | from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000) |
| 269 | goto out_unlock; |
| 270 | if ((attr->ia_valid & ATTR_GID) && |
| 271 | from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000) |
| 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 | if ((attr->ia_valid & ATTR_SIZE) && |
| 281 | attr->ia_size != i_size_read(inode)) { |
| 282 | error = inode_newsize_ok(inode, attr->ia_size); |
| 283 | if (error) |
| 284 | goto out_unlock; |
| 285 | |
| 286 | truncate_setsize(inode, attr->ia_size); |
| 287 | hpfs_truncate(inode); |
| 288 | } |
| 289 | |
| 290 | setattr_copy(inode, attr); |
| 291 | |
| 292 | hpfs_write_inode(inode); |
| 293 | |
| 294 | out_unlock: |
| 295 | hpfs_unlock(inode->i_sb); |
| 296 | return error; |
| 297 | } |
| 298 | |
| 299 | void hpfs_write_if_changed(struct inode *inode) |
| 300 | { |
| 301 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
| 302 | |
| 303 | if (hpfs_inode->i_dirty) |
| 304 | hpfs_write_inode(inode); |
| 305 | } |
| 306 | |
| 307 | void hpfs_evict_inode(struct inode *inode) |
| 308 | { |
| 309 | truncate_inode_pages_final(&inode->i_data); |
| 310 | clear_inode(inode); |
| 311 | if (!inode->i_nlink) { |
| 312 | hpfs_lock(inode->i_sb); |
| 313 | hpfs_remove_fnode(inode->i_sb, inode->i_ino); |
| 314 | hpfs_unlock(inode->i_sb); |
| 315 | } |
| 316 | } |