linux/fs/hpfs/inode.c
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   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 "hpfs_fn.h"
  11
  12void hpfs_init_inode(struct inode *i)
  13{
  14        struct super_block *sb = i->i_sb;
  15        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  16
  17        i->i_uid = hpfs_sb(sb)->sb_uid;
  18        i->i_gid = hpfs_sb(sb)->sb_gid;
  19        i->i_mode = hpfs_sb(sb)->sb_mode;
  20        i->i_size = -1;
  21        i->i_blocks = -1;
  22        
  23        hpfs_inode->i_dno = 0;
  24        hpfs_inode->i_n_secs = 0;
  25        hpfs_inode->i_file_sec = 0;
  26        hpfs_inode->i_disk_sec = 0;
  27        hpfs_inode->i_dpos = 0;
  28        hpfs_inode->i_dsubdno = 0;
  29        hpfs_inode->i_ea_mode = 0;
  30        hpfs_inode->i_ea_uid = 0;
  31        hpfs_inode->i_ea_gid = 0;
  32        hpfs_inode->i_ea_size = 0;
  33
  34        hpfs_inode->i_rddir_off = NULL;
  35        hpfs_inode->i_dirty = 0;
  36
  37        i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0;
  38        i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0;
  39        i->i_atime.tv_sec = i->i_atime.tv_nsec = 0;
  40}
  41
  42void hpfs_read_inode(struct inode *i)
  43{
  44        struct buffer_head *bh;
  45        struct fnode *fnode;
  46        struct super_block *sb = i->i_sb;
  47        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
  48        void *ea;
  49        int ea_size;
  50
  51        if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
  52                /*i->i_mode |= S_IFREG;
  53                i->i_mode &= ~0111;
  54                i->i_op = &hpfs_file_iops;
  55                i->i_fop = &hpfs_file_ops;
  56                clear_nlink(i);*/
  57                make_bad_inode(i);
  58                return;
  59        }
  60        if (hpfs_sb(i->i_sb)->sb_eas) {
  61                if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
  62                        if (ea_size == 2) {
  63                                i->i_uid = le16_to_cpu(*(__le16*)ea);
  64                                hpfs_inode->i_ea_uid = 1;
  65                        }
  66                        kfree(ea);
  67                }
  68                if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
  69                        if (ea_size == 2) {
  70                                i->i_gid = le16_to_cpu(*(__le16*)ea);
  71                                hpfs_inode->i_ea_gid = 1;
  72                        }
  73                        kfree(ea);
  74                }
  75                if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
  76                        kfree(ea);
  77                        i->i_mode = S_IFLNK | 0777;
  78                        i->i_op = &page_symlink_inode_operations;
  79                        i->i_data.a_ops = &hpfs_symlink_aops;
  80                        set_nlink(i, 1);
  81                        i->i_size = ea_size;
  82                        i->i_blocks = 1;
  83                        brelse(bh);
  84                        return;
  85                }
  86                if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
  87                        int rdev = 0;
  88                        umode_t mode = hpfs_sb(sb)->sb_mode;
  89                        if (ea_size == 2) {
  90                                mode = le16_to_cpu(*(__le16*)ea);
  91                                hpfs_inode->i_ea_mode = 1;
  92                        }
  93                        kfree(ea);
  94                        i->i_mode = mode;
  95                        if (S_ISBLK(mode) || S_ISCHR(mode)) {
  96                                if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
  97                                        if (ea_size == 4)
  98                                                rdev = le32_to_cpu(*(__le32*)ea);
  99                                        kfree(ea);
 100                                }
 101                        }
 102                        if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 103                                brelse(bh);
 104                                set_nlink(i, 1);
 105                                i->i_size = 0;
 106                                i->i_blocks = 1;
 107                                init_special_inode(i, mode,
 108                                        new_decode_dev(rdev));
 109                                return;
 110                        }
 111                }
 112        }
 113        if (fnode_is_dir(fnode)) {
 114                int n_dnodes, n_subdirs;
 115                i->i_mode |= S_IFDIR;
 116                i->i_op = &hpfs_dir_iops;
 117                i->i_fop = &hpfs_dir_ops;
 118                hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up);
 119                hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno);
 120                if (hpfs_sb(sb)->sb_chk >= 2) {
 121                        struct buffer_head *bh0;
 122                        if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
 123                }
 124                n_dnodes = 0; n_subdirs = 0;
 125                hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
 126                i->i_blocks = 4 * n_dnodes;
 127                i->i_size = 2048 * n_dnodes;
 128                set_nlink(i, 2 + n_subdirs);
 129        } else {
 130                i->i_mode |= S_IFREG;
 131                if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
 132                i->i_op = &hpfs_file_iops;
 133                i->i_fop = &hpfs_file_ops;
 134                set_nlink(i, 1);
 135                i->i_size = le32_to_cpu(fnode->file_size);
 136                i->i_blocks = ((i->i_size + 511) >> 9) + 1;
 137                i->i_data.a_ops = &hpfs_aops;
 138                hpfs_i(i)->mmu_private = i->i_size;
 139        }
 140        brelse(bh);
 141}
 142
 143static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
 144{
 145        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 146        /*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) {
 147                   Some unknown structures like ACL may be in fnode,
 148                   we'd better not overwrite them
 149                hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
 150        } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
 151                __le32 ea;
 152                if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
 153                        ea = cpu_to_le32(i->i_uid);
 154                        hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
 155                        hpfs_inode->i_ea_uid = 1;
 156                }
 157                if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
 158                        ea = cpu_to_le32(i->i_gid);
 159                        hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
 160                        hpfs_inode->i_ea_gid = 1;
 161                }
 162                if (!S_ISLNK(i->i_mode))
 163                        if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
 164                          | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
 165                          && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
 166                          | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
 167                                ea = cpu_to_le32(i->i_mode);
 168                                /* sick, but legal */
 169                                hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
 170                                hpfs_inode->i_ea_mode = 1;
 171                        }
 172                if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 173                        ea = cpu_to_le32(new_encode_dev(i->i_rdev));
 174                        hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
 175                }
 176        }
 177}
 178
 179void hpfs_write_inode(struct inode *i)
 180{
 181        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 182        struct inode *parent;
 183        if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 184        if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
 185                if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
 186                kfree(hpfs_inode->i_rddir_off);
 187                hpfs_inode->i_rddir_off = NULL;
 188        }
 189        if (!i->i_nlink) {
 190                return;
 191        }
 192        parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
 193        if (parent) {
 194                hpfs_inode->i_dirty = 0;
 195                if (parent->i_state & I_NEW) {
 196                        hpfs_init_inode(parent);
 197                        hpfs_read_inode(parent);
 198                        unlock_new_inode(parent);
 199                }
 200                hpfs_write_inode_nolock(i);
 201                iput(parent);
 202        }
 203}
 204
 205void hpfs_write_inode_nolock(struct inode *i)
 206{
 207        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 208        struct buffer_head *bh;
 209        struct fnode *fnode;
 210        struct quad_buffer_head qbh;
 211        struct hpfs_dirent *de;
 212        if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 213        if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 214        if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 215                if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 216                        brelse(bh);
 217                        return;
 218                }
 219        } else de = NULL;
 220        if (S_ISREG(i->i_mode)) {
 221                fnode->file_size = cpu_to_le32(i->i_size);
 222                if (de) de->file_size = cpu_to_le32(i->i_size);
 223        } else if (S_ISDIR(i->i_mode)) {
 224                fnode->file_size = cpu_to_le32(0);
 225                if (de) de->file_size = cpu_to_le32(0);
 226        }
 227        hpfs_write_inode_ea(i, fnode);
 228        if (de) {
 229                de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 230                de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 231                de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 232                de->read_only = !(i->i_mode & 0222);
 233                de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
 234                hpfs_mark_4buffers_dirty(&qbh);
 235                hpfs_brelse4(&qbh);
 236        }
 237        if (S_ISDIR(i->i_mode)) {
 238                if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 239                        de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 240                        de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 241                        de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 242                        de->read_only = !(i->i_mode & 0222);
 243                        de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
 244                        de->file_size = cpu_to_le32(0);
 245                        hpfs_mark_4buffers_dirty(&qbh);
 246                        hpfs_brelse4(&qbh);
 247                } else
 248                        hpfs_error(i->i_sb,
 249                                "directory %08lx doesn't have '.' entry",
 250                                (unsigned long)i->i_ino);
 251        }
 252        mark_buffer_dirty(bh);
 253        brelse(bh);
 254}
 255
 256int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 257{
 258        struct inode *inode = dentry->d_inode;
 259        int error = -EINVAL;
 260
 261        hpfs_lock(inode->i_sb);
 262        if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 263                goto out_unlock;
 264        if ((attr->ia_valid & ATTR_UID) && attr->ia_uid >= 0x10000)
 265                goto out_unlock;
 266        if ((attr->ia_valid & ATTR_GID) && attr->ia_gid >= 0x10000)
 267                goto out_unlock;
 268        if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 269                goto out_unlock;
 270
 271        error = inode_change_ok(inode, attr);
 272        if (error)
 273                goto out_unlock;
 274
 275        if ((attr->ia_valid & ATTR_SIZE) &&
 276            attr->ia_size != i_size_read(inode)) {
 277                error = vmtruncate(inode, attr->ia_size);
 278                if (error)
 279                        goto out_unlock;
 280        }
 281
 282        setattr_copy(inode, attr);
 283
 284        hpfs_write_inode(inode);
 285
 286 out_unlock:
 287        hpfs_unlock(inode->i_sb);
 288        return error;
 289}
 290
 291void 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
 299void hpfs_evict_inode(struct inode *inode)
 300{
 301        truncate_inode_pages(&inode->i_data, 0);
 302        clear_inode(inode);
 303        if (!inode->i_nlink) {
 304                hpfs_lock(inode->i_sb);
 305                hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 306                hpfs_unlock(inode->i_sb);
 307        }
 308}
 309
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