11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/hpfs/dir.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * directory VFS functions 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 95a0e3ad6STejun Heo #include <linux/slab.h> 101da177e4SLinus Torvalds #include "hpfs_fn.h" 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds static int hpfs_dir_release(struct inode *inode, struct file *filp) 131da177e4SLinus Torvalds { 149a311b96SArnd Bergmann hpfs_lock(inode->i_sb); 151da177e4SLinus Torvalds hpfs_del_pos(inode, &filp->f_pos); 161da177e4SLinus Torvalds /*hpfs_write_if_changed(inode);*/ 179a311b96SArnd Bergmann hpfs_unlock(inode->i_sb); 181da177e4SLinus Torvalds return 0; 191da177e4SLinus Torvalds } 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds /* This is slow, but it's not used often */ 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) 241da177e4SLinus Torvalds { 251da177e4SLinus Torvalds loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); 261da177e4SLinus Torvalds loff_t pos; 271da177e4SLinus Torvalds struct quad_buffer_head qbh; 28575800b3SJosef Sipek struct inode *i = filp->f_path.dentry->d_inode; 291da177e4SLinus Torvalds struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 301da177e4SLinus Torvalds struct super_block *s = i->i_sb; 311da177e4SLinus Torvalds 32*06222e49SJosef Bacik /* Somebody else will have to figure out what to do here */ 33*06222e49SJosef Bacik if (whence == SEEK_DATA || whence == SEEK_HOLE) 34*06222e49SJosef Bacik return -EINVAL; 35*06222e49SJosef Bacik 369a311b96SArnd Bergmann hpfs_lock(s); 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds /*printk("dir lseek\n");*/ 391da177e4SLinus Torvalds if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; 401b1dcc1bSJes Sorensen mutex_lock(&i->i_mutex); 411da177e4SLinus Torvalds pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; 421da177e4SLinus Torvalds while (pos != new_off) { 431da177e4SLinus Torvalds if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); 441da177e4SLinus Torvalds else goto fail; 451da177e4SLinus Torvalds if (pos == 12) goto fail; 461da177e4SLinus Torvalds } 471b1dcc1bSJes Sorensen mutex_unlock(&i->i_mutex); 481da177e4SLinus Torvalds ok: 499a311b96SArnd Bergmann hpfs_unlock(s); 501da177e4SLinus Torvalds return filp->f_pos = new_off; 511da177e4SLinus Torvalds fail: 521b1dcc1bSJes Sorensen mutex_unlock(&i->i_mutex); 531da177e4SLinus Torvalds /*printk("illegal lseek: %016llx\n", new_off);*/ 549a311b96SArnd Bergmann hpfs_unlock(s); 551da177e4SLinus Torvalds return -ESPIPE; 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 591da177e4SLinus Torvalds { 60575800b3SJosef Sipek struct inode *inode = filp->f_path.dentry->d_inode; 611da177e4SLinus Torvalds struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 621da177e4SLinus Torvalds struct quad_buffer_head qbh; 631da177e4SLinus Torvalds struct hpfs_dirent *de; 641da177e4SLinus Torvalds int lc; 651da177e4SLinus Torvalds long old_pos; 667e7742eeSAl Viro unsigned char *tempname; 671da177e4SLinus Torvalds int c1, c2 = 0; 681da177e4SLinus Torvalds int ret = 0; 691da177e4SLinus Torvalds 709a311b96SArnd Bergmann hpfs_lock(inode->i_sb); 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds if (hpfs_sb(inode->i_sb)->sb_chk) { 731da177e4SLinus Torvalds if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 741da177e4SLinus Torvalds ret = -EFSERROR; 751da177e4SLinus Torvalds goto out; 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 781da177e4SLinus Torvalds ret = -EFSERROR; 791da177e4SLinus Torvalds goto out; 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 831da177e4SLinus Torvalds struct buffer_head *bh; 841da177e4SLinus Torvalds struct fnode *fno; 851da177e4SLinus Torvalds int e = 0; 861da177e4SLinus Torvalds if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 871da177e4SLinus Torvalds ret = -EIOERROR; 881da177e4SLinus Torvalds goto out; 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds if (!fno->dirflag) { 911da177e4SLinus Torvalds e = 1; 9218debbbcSRandy Dunlap hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 9318debbbcSRandy Dunlap (unsigned long)inode->i_ino); 941da177e4SLinus Torvalds } 950b69760bSMikulas Patocka if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { 961da177e4SLinus Torvalds e = 1; 970b69760bSMikulas Patocka hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno)); 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds brelse(bh); 1001da177e4SLinus Torvalds if (e) { 1011da177e4SLinus Torvalds ret = -EFSERROR; 1021da177e4SLinus Torvalds goto out; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds lc = hpfs_sb(inode->i_sb)->sb_lowercase; 1061da177e4SLinus Torvalds if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 1071da177e4SLinus Torvalds filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 1081da177e4SLinus Torvalds goto out; 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds if (filp->f_pos == 13) { 1111da177e4SLinus Torvalds ret = -ENOENT; 1121da177e4SLinus Torvalds goto out; 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds while (1) { 1161da177e4SLinus Torvalds again: 1171da177e4SLinus Torvalds /* This won't work when cycle is longer than number of dirents 1181da177e4SLinus Torvalds accepted by filldir, but what can I do? 1191da177e4SLinus Torvalds maybe killall -9 ls helps */ 1201da177e4SLinus Torvalds if (hpfs_sb(inode->i_sb)->sb_chk) 1211da177e4SLinus Torvalds if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 1221da177e4SLinus Torvalds ret = -EFSERROR; 1231da177e4SLinus Torvalds goto out; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds if (filp->f_pos == 12) 1261da177e4SLinus Torvalds goto out; 1271da177e4SLinus Torvalds if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 1281da177e4SLinus Torvalds printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 1291da177e4SLinus Torvalds goto out; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds if (filp->f_pos == 0) { 1321da177e4SLinus Torvalds if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 1331da177e4SLinus Torvalds goto out; 1341da177e4SLinus Torvalds filp->f_pos = 11; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds if (filp->f_pos == 11) { 1371da177e4SLinus Torvalds if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 1381da177e4SLinus Torvalds goto out; 1391da177e4SLinus Torvalds filp->f_pos = 1; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds if (filp->f_pos == 1) { 1421da177e4SLinus Torvalds filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 1431da177e4SLinus Torvalds hpfs_add_pos(inode, &filp->f_pos); 1441da177e4SLinus Torvalds filp->f_version = inode->i_version; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds old_pos = filp->f_pos; 1471da177e4SLinus Torvalds if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 1481da177e4SLinus Torvalds ret = -EIOERROR; 1491da177e4SLinus Torvalds goto out; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds if (de->first || de->last) { 1521da177e4SLinus Torvalds if (hpfs_sb(inode->i_sb)->sb_chk) { 15318debbbcSRandy Dunlap if (de->first && !de->last && (de->namelen != 2 15418debbbcSRandy Dunlap || de ->name[0] != 1 || de->name[1] != 1)) 15518debbbcSRandy Dunlap hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); 15618debbbcSRandy Dunlap if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 15718debbbcSRandy Dunlap hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds hpfs_brelse4(&qbh); 1601da177e4SLinus Torvalds goto again; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 1630b69760bSMikulas Patocka if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { 1641da177e4SLinus Torvalds filp->f_pos = old_pos; 1657e7742eeSAl Viro if (tempname != de->name) kfree(tempname); 1661da177e4SLinus Torvalds hpfs_brelse4(&qbh); 1671da177e4SLinus Torvalds goto out; 1681da177e4SLinus Torvalds } 1697e7742eeSAl Viro if (tempname != de->name) kfree(tempname); 1701da177e4SLinus Torvalds hpfs_brelse4(&qbh); 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds out: 1739a311b96SArnd Bergmann hpfs_unlock(inode->i_sb); 1741da177e4SLinus Torvalds return ret; 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * lookup. Search the specified directory for the specified name, set 1791da177e4SLinus Torvalds * *result to the corresponding inode. 1801da177e4SLinus Torvalds * 1811da177e4SLinus Torvalds * lookup uses the inode number to tell read_inode whether it is reading 1821da177e4SLinus Torvalds * the inode of a directory or a file -- file ino's are odd, directory 1831da177e4SLinus Torvalds * ino's are even. read_inode avoids i/o for file inodes; everything 1841da177e4SLinus Torvalds * needed is up here in the directory. (And file fnodes are out in 1851da177e4SLinus Torvalds * the boondocks.) 1861da177e4SLinus Torvalds * 1871da177e4SLinus Torvalds * - M.P.: this is over, sometimes we've got to read file's fnode for eas 1881da177e4SLinus Torvalds * inode numbers are just fnode sector numbers; iget lock is used 1891da177e4SLinus Torvalds * to tell read_inode to read fnode or not. 1901da177e4SLinus Torvalds */ 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 1931da177e4SLinus Torvalds { 1947e7742eeSAl Viro const unsigned char *name = dentry->d_name.name; 1951da177e4SLinus Torvalds unsigned len = dentry->d_name.len; 1961da177e4SLinus Torvalds struct quad_buffer_head qbh; 1971da177e4SLinus Torvalds struct hpfs_dirent *de; 1981da177e4SLinus Torvalds ino_t ino; 1991da177e4SLinus Torvalds int err; 2001da177e4SLinus Torvalds struct inode *result = NULL; 2011da177e4SLinus Torvalds struct hpfs_inode_info *hpfs_result; 2021da177e4SLinus Torvalds 2039a311b96SArnd Bergmann hpfs_lock(dir->i_sb); 2047e7742eeSAl Viro if ((err = hpfs_chk_name(name, &len))) { 2051da177e4SLinus Torvalds if (err == -ENAMETOOLONG) { 2069a311b96SArnd Bergmann hpfs_unlock(dir->i_sb); 2071da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds goto end_add; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 2131da177e4SLinus Torvalds * '.' and '..' will never be passed here. 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds 2167e7742eeSAl Viro de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds /* 2191da177e4SLinus Torvalds * This is not really a bailout, just means file not found. 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds if (!de) goto end; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds /* 2251da177e4SLinus Torvalds * Get inode number, what we're after. 2261da177e4SLinus Torvalds */ 2271da177e4SLinus Torvalds 2280b69760bSMikulas Patocka ino = le32_to_cpu(de->fnode); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * Go find or make an inode. 2321da177e4SLinus Torvalds */ 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds result = iget_locked(dir->i_sb, ino); 2351da177e4SLinus Torvalds if (!result) { 2361da177e4SLinus Torvalds hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 2371da177e4SLinus Torvalds goto bail1; 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds if (result->i_state & I_NEW) { 2401da177e4SLinus Torvalds hpfs_init_inode(result); 2411da177e4SLinus Torvalds if (de->directory) 2421da177e4SLinus Torvalds hpfs_read_inode(result); 2430b69760bSMikulas Patocka else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) 2441da177e4SLinus Torvalds hpfs_read_inode(result); 2451da177e4SLinus Torvalds else { 2461da177e4SLinus Torvalds result->i_mode |= S_IFREG; 2471da177e4SLinus Torvalds result->i_mode &= ~0111; 2481da177e4SLinus Torvalds result->i_op = &hpfs_file_iops; 2491da177e4SLinus Torvalds result->i_fop = &hpfs_file_ops; 2501da177e4SLinus Torvalds result->i_nlink = 1; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds unlock_new_inode(result); 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds hpfs_result = hpfs_i(result); 2551da177e4SLinus Torvalds if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 2581da177e4SLinus Torvalds hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures"); 2591da177e4SLinus Torvalds goto bail1; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* 2631da177e4SLinus Torvalds * Fill in the info from the directory if this is a newly created 2641da177e4SLinus Torvalds * inode. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds if (!result->i_ctime.tv_sec) { 2680b69760bSMikulas Patocka if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) 2691da177e4SLinus Torvalds result->i_ctime.tv_sec = 1; 2701da177e4SLinus Torvalds result->i_ctime.tv_nsec = 0; 2710b69760bSMikulas Patocka result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); 2721da177e4SLinus Torvalds result->i_mtime.tv_nsec = 0; 2730b69760bSMikulas Patocka result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); 2741da177e4SLinus Torvalds result->i_atime.tv_nsec = 0; 2750b69760bSMikulas Patocka hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); 2761da177e4SLinus Torvalds if (!hpfs_result->i_ea_mode && de->read_only) 2771da177e4SLinus Torvalds result->i_mode &= ~0222; 2781da177e4SLinus Torvalds if (!de->directory) { 2791da177e4SLinus Torvalds if (result->i_size == -1) { 2800b69760bSMikulas Patocka result->i_size = le32_to_cpu(de->file_size); 2811da177e4SLinus Torvalds result->i_data.a_ops = &hpfs_aops; 2821da177e4SLinus Torvalds hpfs_i(result)->mmu_private = result->i_size; 2831da177e4SLinus Torvalds /* 2841da177e4SLinus Torvalds * i_blocks should count the fnode and any anodes. 2851da177e4SLinus Torvalds * We count 1 for the fnode and don't bother about 2861da177e4SLinus Torvalds * anodes -- the disk heads are on the directory band 2871da177e4SLinus Torvalds * and we want them to stay there. 2881da177e4SLinus Torvalds */ 2891da177e4SLinus Torvalds result->i_blocks = 1 + ((result->i_size + 511) >> 9); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds hpfs_brelse4(&qbh); 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* 2971da177e4SLinus Torvalds * Made it. 2981da177e4SLinus Torvalds */ 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds end: 3011da177e4SLinus Torvalds end_add: 3029a311b96SArnd Bergmann hpfs_unlock(dir->i_sb); 3031da177e4SLinus Torvalds d_add(dentry, result); 3041da177e4SLinus Torvalds return NULL; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* 3071da177e4SLinus Torvalds * Didn't. 3081da177e4SLinus Torvalds */ 3091da177e4SLinus Torvalds bail1: 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds hpfs_brelse4(&qbh); 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /*bail:*/ 3141da177e4SLinus Torvalds 3159a311b96SArnd Bergmann hpfs_unlock(dir->i_sb); 3161da177e4SLinus Torvalds return ERR_PTR(-ENOENT); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3194b6f5d20SArjan van de Ven const struct file_operations hpfs_dir_ops = 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds .llseek = hpfs_dir_lseek, 3221da177e4SLinus Torvalds .read = generic_read_dir, 3231da177e4SLinus Torvalds .readdir = hpfs_readdir, 3241da177e4SLinus Torvalds .release = hpfs_dir_release, 3251da177e4SLinus Torvalds .fsync = hpfs_file_fsync, 3261da177e4SLinus Torvalds }; 327