linux/fs/hpfs/inode.c
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   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
  14void 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
  44void 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
 146static 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
 182void 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
 209void 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
 260int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 261{
 262        struct inode *inode = d_inode(dentry);
 263        int error = -EINVAL;
 264
 265        hpfs_lock(inode->i_sb);
 266        if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 267                goto out_unlock;
 268        if ((attr->ia_valid & ATTR_UID) &&
 269            from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
 270                goto out_unlock;
 271        if ((attr->ia_valid & ATTR_GID) &&
 272            from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
 273                goto out_unlock;
 274        if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 275                goto out_unlock;
 276
 277        error = setattr_prepare(dentry, attr);
 278        if (error)
 279                goto out_unlock;
 280
 281        if ((attr->ia_valid & ATTR_SIZE) &&
 282            attr->ia_size != i_size_read(inode)) {
 283                error = inode_newsize_ok(inode, attr->ia_size);
 284                if (error)
 285                        goto out_unlock;
 286
 287                truncate_setsize(inode, attr->ia_size);
 288                hpfs_truncate(inode);
 289        }
 290
 291        setattr_copy(inode, attr);
 292
 293        hpfs_write_inode(inode);
 294
 295 out_unlock:
 296        hpfs_unlock(inode->i_sb);
 297        return error;
 298}
 299
 300void hpfs_write_if_changed(struct inode *inode)
 301{
 302        struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 303
 304        if (hpfs_inode->i_dirty)
 305                hpfs_write_inode(inode);
 306}
 307
 308void hpfs_evict_inode(struct inode *inode)
 309{
 310        truncate_inode_pages_final(&inode->i_data);
 311        clear_inode(inode);
 312        if (!inode->i_nlink) {
 313                hpfs_lock(inode->i_sb);
 314                hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 315                hpfs_unlock(inode->i_sb);
 316        }
 317}
 318