/* * linux/fs/hpfs/dir.c * * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 * * directory VFS functions */ #include <linux/slab.h> #include "hpfs_fn.h" static int hpfs_dir_release(struct inode *inode, struct file *filp) { hpfs_lock(inode->i_sb); hpfs_del_pos(inode, &filp->f_pos); /*hpfs_write_if_changed(inode);*/ hpfs_unlock(inode->i_sb); return 0; } /* This is slow, but it's not used often */ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) { loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); loff_t pos; struct quad_buffer_head qbh; struct inode *i = file_inode(filp); struct hpfs_inode_info *hpfs_inode = hpfs_i(i); struct super_block *s = i->i_sb; /* Somebody else will have to figure out what to do here */ if (whence == SEEK_DATA || whence == SEEK_HOLE) return -EINVAL; mutex_lock(&i->i_mutex); hpfs_lock(s); /*pr_info("dir lseek\n");*/ if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; while (pos != new_off) { if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); else goto fail; if (pos == 12) goto fail; } hpfs_add_pos(i, &filp->f_pos); ok: filp->f_pos = new_off; hpfs_unlock(s); mutex_unlock(&i->i_mutex); return new_off; fail: /*pr_warn("illegal lseek: %016llx\n", new_off);*/ hpfs_unlock(s); mutex_unlock(&i->i_mutex); return -ESPIPE; } static int hpfs_readdir(struct file *file, struct dir_context *ctx) { struct inode *inode = file_inode(file); struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); struct quad_buffer_head qbh; struct hpfs_dirent *de; int lc; loff_t next_pos; unsigned char *tempname; int c1, c2 = 0; int ret = 0; hpfs_lock(inode->i_sb); if (hpfs_sb(inode->i_sb)->sb_chk) { if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { ret = -EFSERROR; goto out; } if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { ret = -EFSERROR; goto out; } } if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { struct buffer_head *bh; struct fnode *fno; int e = 0; if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { ret = -EIOERROR; goto out; } if (!fnode_is_dir(fno)) { e = 1; hpfs_error(inode->i_sb, "not a directory, fnode %08lx", (unsigned long)inode->i_ino); } if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { e = 1; 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)); } brelse(bh); if (e) { ret = -EFSERROR; goto out; } } lc = hpfs_sb(inode->i_sb)->sb_lowercase; if (ctx->pos == 12) { /* diff -r requires this (note, that diff -r */ ctx->pos = 13; /* also fails on msdos filesystem in 2.0) */ goto out; } if (ctx->pos == 13) { ret = -ENOENT; goto out; } while (1) { again: /* This won't work when cycle is longer than number of dirents accepted by filldir, but what can I do? maybe killall -9 ls helps */ if (hpfs_sb(inode->i_sb)->sb_chk) if (hpfs_stop_cycles(inode->i_sb, ctx->pos, &c1, &c2, "hpfs_readdir")) { ret = -EFSERROR; goto out; } if (ctx->pos == 12) goto out; if (ctx->pos == 3 || ctx->pos == 4 || ctx->pos == 5) { pr_err("pos==%d\n", (int)ctx->pos); goto out; } if (ctx->pos == 0) { if (!dir_emit_dot(file, ctx)) goto out; ctx->pos = 11; } if (ctx->pos == 11) { if (!dir_emit(ctx, "..", 2, hpfs_inode->i_parent_dir, DT_DIR)) goto out; ctx->pos = 1; } if (ctx->pos == 1) { ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; hpfs_add_pos(inode, &file->f_pos); file->f_version = inode->i_version; } next_pos = ctx->pos; if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) { ctx->pos = next_pos; ret = -EIOERROR; goto out; } if (de->first || de->last) { if (hpfs_sb(inode->i_sb)->sb_chk) { if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", (unsigned long)ctx->pos); if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", (unsigned long)ctx->pos); } hpfs_brelse4(&qbh); ctx->pos = next_pos; goto again; } tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); if (!dir_emit(ctx, tempname, de->namelen, le32_to_cpu(de->fnode), DT_UNKNOWN)) { if (tempname != de->name) kfree(tempname); hpfs_brelse4(&qbh); goto out; } ctx->pos = next_pos; if (tempname != de->name) kfree(tempname); hpfs_brelse4(&qbh); } out: hpfs_unlock(inode->i_sb); return ret; } /* * lookup. Search the specified directory for the specified name, set * *result to the corresponding inode. * * lookup uses the inode number to tell read_inode whether it is reading * the inode of a directory or a file -- file ino's are odd, directory * ino's are even. read_inode avoids i/o for file inodes; everything * needed is up here in the directory. (And file fnodes are out in * the boondocks.) * * - M.P.: this is over, sometimes we've got to read file's fnode for eas * inode numbers are just fnode sector numbers; iget lock is used * to tell read_inode to read fnode or not. */ struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { const unsigned char *name = dentry->d_name.name; unsigned len = dentry->d_name.len; struct quad_buffer_head qbh; struct hpfs_dirent *de; ino_t ino; int err; struct inode *result = NULL; struct hpfs_inode_info *hpfs_result; hpfs_lock(dir->i_sb); if ((err = hpfs_chk_name(name, &len))) { if (err == -ENAMETOOLONG) { hpfs_unlock(dir->i_sb); return ERR_PTR(-ENAMETOOLONG); } goto end_add; } /* * '.' and '..' will never be passed here. */ de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); /* * This is not really a bailout, just means file not found. */ if (!de) goto end; /* * Get inode number, what we're after. */ ino = le32_to_cpu(de->fnode); /* * Go find or make an inode. */ result = iget_locked(dir->i_sb, ino); if (!result) { hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); goto bail1; } if (result->i_state & I_NEW) { hpfs_init_inode(result); if (de->directory) hpfs_read_inode(result); else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) hpfs_read_inode(result); else { result->i_mode |= S_IFREG; result->i_mode &= ~0111; result->i_op = &hpfs_file_iops; result->i_fop = &hpfs_file_ops; set_nlink(result, 1); } unlock_new_inode(result); } hpfs_result = hpfs_i(result); if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 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"); goto bail1; } /* * Fill in the info from the directory if this is a newly created * inode. */ if (!result->i_ctime.tv_sec) { if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) result->i_ctime.tv_sec = 1; result->i_ctime.tv_nsec = 0; result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); result->i_mtime.tv_nsec = 0; result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); result->i_atime.tv_nsec = 0; hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); if (!hpfs_result->i_ea_mode && de->read_only) result->i_mode &= ~0222; if (!de->directory) { if (result->i_size == -1) { result->i_size = le32_to_cpu(de->file_size); result->i_data.a_ops = &hpfs_aops; hpfs_i(result)->mmu_private = result->i_size; /* * i_blocks should count the fnode and any anodes. * We count 1 for the fnode and don't bother about * anodes -- the disk heads are on the directory band * and we want them to stay there. */ result->i_blocks = 1 + ((result->i_size + 511) >> 9); } } } hpfs_brelse4(&qbh); /* * Made it. */ end: end_add: hpfs_unlock(dir->i_sb); d_add(dentry, result); return NULL; /* * Didn't. */ bail1: hpfs_brelse4(&qbh); /*bail:*/ hpfs_unlock(dir->i_sb); return ERR_PTR(-ENOENT); } const struct file_operations hpfs_dir_ops = { .llseek = hpfs_dir_lseek, .read = generic_read_dir, .iterate = hpfs_readdir, .release = hpfs_dir_release, .fsync = hpfs_file_fsync, .unlocked_ioctl = hpfs_ioctl, };