1 files changed, 320 insertions, 0 deletions

diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
new file mode 100644
index 000000000000..0217c3a04441
--- /dev/null
+++ b/fs/hpfs/dir.c
@@ -0,0 +1,320 @@
+/*
+ *  linux/fs/hpfs/dir.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  directory VFS functions
+ */
+
+#include "hpfs_fn.h"
+
+static int hpfs_dir_release(struct inode *inode, struct file *filp)
+{
+        lock_kernel();
+        hpfs_del_pos(inode, &filp->f_pos);
+        /*hpfs_write_if_changed(inode);*/
+        unlock_kernel();
+        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 = filp->f_dentry->d_inode;
+        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
+        struct super_block *s = i->i_sb;
+
+        lock_kernel();
+
+        /*printk("dir lseek\n");*/
+        if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
+        down(&i->i_sem);
+        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;
+        }
+        up(&i->i_sem);
+ok:
+        unlock_kernel();
+        return filp->f_pos = new_off;
+fail:
+        up(&i->i_sem);
+        /*printk("illegal lseek: %016llx\n", new_off);*/
+        unlock_kernel();
+        return -ESPIPE;
+}
+
+static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+        struct inode *inode = filp->f_dentry->d_inode;
+        struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
+        struct quad_buffer_head qbh;
+        struct hpfs_dirent *de;
+        int lc;
+        long old_pos;
+        char *tempname;
+        int c1, c2 = 0;
+        int ret = 0;
+
+        lock_kernel();
+
+        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 (!fno->dirflag) {
+                        e = 1;
+                        hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
+                }
+                if (hpfs_inode->i_dno != 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, fno->u.external[0].disk_secno);
+                }
+                brelse(bh);
+                if (e) {
+                        ret = -EFSERROR;
+                        goto out;
+                }
+        }
+        lc = hpfs_sb(inode->i_sb)->sb_lowercase;
+        if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
+                filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
+                goto out;
+        }
+        if (filp->f_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, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
+                                ret = -EFSERROR;
+                                goto out;
+                        }
+                if (filp->f_pos == 12)
+                        goto out;
+                if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
+                        printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
+                        goto out;
+                }
+                if (filp->f_pos == 0) {
+                        if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
+                                goto out;
+                        filp->f_pos = 11;
+                }
+                if (filp->f_pos == 11) {
+                        if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
+                                goto out;
+                        filp->f_pos = 1;
+                }
+                if (filp->f_pos == 1) {
+                        filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
+                        hpfs_add_pos(inode, &filp->f_pos);
+                        filp->f_version = inode->i_version;
+                }
+                old_pos = filp->f_pos;
+                if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
+                        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 = %08x", old_pos);
+                                if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos);
+                        }
+                        hpfs_brelse4(&qbh);
+                        goto again;
+                }
+                tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
+                if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
+                        filp->f_pos = old_pos;
+                        if (tempname != (char *)de->name) kfree(tempname);
+                        hpfs_brelse4(&qbh);
+                        goto out;
+                }
+                if (tempname != (char *)de->name) kfree(tempname);
+                hpfs_brelse4(&qbh);
+        }
+out:
+        unlock_kernel();
+        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, struct nameidata *nd)
+{
+        const 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;
+
+        lock_kernel();
+        if ((err = hpfs_chk_name((char *)name, &len))) {
+                if (err == -ENAMETOOLONG) {
+                        unlock_kernel();
+                        return ERR_PTR(-ENAMETOOLONG);
+                }
+                goto end_add;
+        }
+
+        /*
+         * '.' and '..' will never be passed here.
+         */
+
+        de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) 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 = 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 (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;
+                        result->i_nlink = 1;
+                }
+                unlock_new_inode(result);
+        }
+        hpfs_result = hpfs_i(result);
+        if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
+
+        hpfs_decide_conv(result, (char *)name, len);
+
+        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, 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, de->write_date);
+                result->i_mtime.tv_nsec = 0;
+                result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date);
+                result->i_atime.tv_nsec = 0;
+                hpfs_result->i_ea_size = 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 = 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_set_dentry_operations(dentry);
+        unlock_kernel();
+        d_add(dentry, result);
+        return NULL;
+
+        /*
+         * Didn't.
+         */
+        bail1:
+        
+        hpfs_brelse4(&qbh);
+        
+        /*bail:*/
+
+        unlock_kernel();
+        return ERR_PTR(-ENOENT);
+}
+
+struct file_operations hpfs_dir_ops =
+{
+        .llseek         = hpfs_dir_lseek,
+        .read           = generic_read_dir,
+        .readdir        = hpfs_readdir,
+        .release        = hpfs_dir_release,
+        .fsync          = hpfs_file_fsync,
+};