fs/hpfs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/hpfs/inode.c
   4  *
   5  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   6  *
   7  *  inode VFS functions
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/user_namespace.h>
  12 #include "hpfs_fn.h"
  13
  14 void hpfs_init_inode(struct inode *i)
  15 {
  16         struct super_block *sb = i->i_sb;
  17         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  18
  19         i->i_uid = hpfs_sb(sb)->sb_uid;
  20         i->i_gid = hpfs_sb(sb)->sb_gid;
  21         i->i_mode = hpfs_sb(sb)->sb_mode;
  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                 clear_nlink(i);*/
  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_uid_write(i, 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_gid_write(i, 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                         inode_nohighmem(i);
  82                         i->i_data.a_ops = &hpfs_symlink_aops;
  83                         set_nlink(i, 1);
  84                         i->i_size = ea_size;
  85                         i->i_blocks = 1;
  86                         brelse(bh);
  87                         return;
  88                 }
  89                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
  90                         int rdev = 0;
  91                         umode_t mode = hpfs_sb(sb)->sb_mode;
  92                         if (ea_size == 2) {
  93                                 mode = le16_to_cpu(*(__le16*)ea);
  94                                 hpfs_inode->i_ea_mode = 1;
  95                         }
  96                         kfree(ea);
  97                         i->i_mode = mode;
  98                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
  99                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
 100                                         if (ea_size == 4)
 101                                                 rdev = le32_to_cpu(*(__le32*)ea);
 102                                         kfree(ea);
 103                                 }
 104                         }
 105                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 106                                 brelse(bh);
 107                                 set_nlink(i, 1);
 108                                 i->i_size = 0;
 109                                 i->i_blocks = 1;
 110                                 init_special_inode(i, mode,
 111                                         new_decode_dev(rdev));
 112                                 return;
 113                         }
 114                 }
 115         }
 116         if (fnode_is_dir(fnode)) {
 117                 int n_dnodes, n_subdirs;
 118                 i->i_mode |= S_IFDIR;
 119                 i->i_op = &hpfs_dir_iops;
 120                 i->i_fop = &hpfs_dir_ops;
 121                 hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up);
 122                 hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno);
 123                 if (hpfs_sb(sb)->sb_chk >= 2) {
 124                         struct buffer_head *bh0;
 125                         if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
 126                 }
 127                 n_dnodes = 0; n_subdirs = 0;
 128                 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
 129                 i->i_blocks = 4 * n_dnodes;
 130                 i->i_size = 2048 * n_dnodes;
 131                 set_nlink(i, 2 + n_subdirs);
 132         } else {
 133                 i->i_mode |= S_IFREG;
 134                 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
 135                 i->i_op = &hpfs_file_iops;
 136                 i->i_fop = &hpfs_file_ops;
 137                 set_nlink(i, 1);
 138                 i->i_size = le32_to_cpu(fnode->file_size);
 139                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 140                 i->i_data.a_ops = &hpfs_aops;
 141                 hpfs_i(i)->mmu_private = i->i_size;
 142         }
 143         brelse(bh);
 144 }
 145
 146 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 147 {
 148         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 149         /*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) {
 150                    Some unknown structures like ACL may be in fnode,
 151                    we'd better not overwrite them
 152                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 structures", i->i_ino);
 153         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
 154                 __le32 ea;
 155                 if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
 156                         ea = cpu_to_le32(i_uid_read(i));
 157                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
 158                         hpfs_inode->i_ea_uid = 1;
 159                 }
 160                 if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
 161                         ea = cpu_to_le32(i_gid_read(i));
 162                         hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
 163                         hpfs_inode->i_ea_gid = 1;
 164                 }
 165                 if (!S_ISLNK(i->i_mode))
 166                         if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 167                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 168                           && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 169                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
 170                                 ea = cpu_to_le32(i->i_mode);
 171                                 /* sick, but legal */
 172                                 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
 173                                 hpfs_inode->i_ea_mode = 1;
 174                         }
 175                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 176                         ea = cpu_to_le32(new_encode_dev(i->i_rdev));
 177                         hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
 178                 }
 179         }
 180 }
 181
 182 void hpfs_write_inode(struct inode *i)
 183 {
 184         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 185         struct inode *parent;
 186         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 187         if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
 188                 if (*hpfs_inode->i_rddir_off)
 189                         pr_err("write_inode: some position still there\n");
 190                 kfree(hpfs_inode->i_rddir_off);
 191                 hpfs_inode->i_rddir_off = NULL;
 192         }
 193         if (!i->i_nlink) {
 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                 hpfs_write_inode_nolock(i);
 205                 iput(parent);
 206         }
 207 }
 208
 209 void hpfs_write_inode_nolock(struct inode *i)
 210 {
 211         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 212         struct buffer_head *bh;
 213         struct fnode *fnode;
 214         struct quad_buffer_head qbh;
 215         struct hpfs_dirent *de;
 216         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 217         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 218         if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 219                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 220                         brelse(bh);
 221                         return;
 222                 }
 223         } else de = NULL;
 224         if (S_ISREG(i->i_mode)) {
 225                 fnode->file_size = cpu_to_le32(i->i_size);
 226                 if (de) de->file_size = cpu_to_le32(i->i_size);
 227         } else if (S_ISDIR(i->i_mode)) {
 228                 fnode->file_size = cpu_to_le32(0);
 229                 if (de) de->file_size = cpu_to_le32(0);
 230         }
 231         hpfs_write_inode_ea(i, fnode);
 232         if (de) {
 233                 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 234                 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 235                 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 236                 de->read_only = !(i->i_mode & 0222);
 237                 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
 238                 hpfs_mark_4buffers_dirty(&qbh);
 239                 hpfs_brelse4(&qbh);
 240         }
 241         if (S_ISDIR(i->i_mode)) {
 242                 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 243                         de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 244                         de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 245                         de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 246                         de->read_only = !(i->i_mode & 0222);
 247                         de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
 248                         de->file_size = cpu_to_le32(0);
 249                         hpfs_mark_4buffers_dirty(&qbh);
 250                         hpfs_brelse4(&qbh);
 251                 } else
 252                         hpfs_error(i->i_sb,
 253                                 "directory %08lx doesn't have '.' entry",
 254                                 (unsigned long)i->i_ino);
 255         }
 256         mark_buffer_dirty(bh);
 257         brelse(bh);
 258 }
 259
 260 int hpfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 261                  struct iattr *attr)
 262 {
 263         struct inode *inode = d_inode(dentry);
 264         int error = -EINVAL;
 265
 266         hpfs_lock(inode->i_sb);
 267         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 268                 goto out_unlock;
 269         if ((attr->ia_valid & ATTR_UID) &&
 270             from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
 271                 goto out_unlock;
 272         if ((attr->ia_valid & ATTR_GID) &&
 273             from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
 274                 goto out_unlock;
 275         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 276                 goto out_unlock;
 277
 278         error = setattr_prepare(&init_user_ns, dentry, attr);
 279         if (error)
 280                 goto out_unlock;
 281
 282         if ((attr->ia_valid & ATTR_SIZE) &&
 283             attr->ia_size != i_size_read(inode)) {
 284                 error = inode_newsize_ok(inode, attr->ia_size);
 285                 if (error)
 286                         goto out_unlock;
 287
 288                 truncate_setsize(inode, attr->ia_size);
 289                 hpfs_truncate(inode);
 290         }
 291
 292         setattr_copy(&init_user_ns, inode, attr);
 293
 294         hpfs_write_inode(inode);
 295
 296  out_unlock:
 297         hpfs_unlock(inode->i_sb);
 298         return error;
 299 }
 300
 301 void hpfs_write_if_changed(struct inode *inode)
 302 {
 303         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 304
 305         if (hpfs_inode->i_dirty)
 306                 hpfs_write_inode(inode);
 307 }
 308
 309 void hpfs_evict_inode(struct inode *inode)
 310 {
 311         truncate_inode_pages_final(&inode->i_data);
 312         clear_inode(inode);
 313         if (!inode->i_nlink) {
 314                 hpfs_lock(inode->i_sb);
 315                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 316                 hpfs_unlock(inode->i_sb);
 317         }
 318 }