347 lines
9.0 KiB
C
347 lines
9.0 KiB
C
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/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include "reiserfs.h"
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#include <linux/stat.h>
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#include <linux/buffer_head.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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extern const struct reiserfs_key MIN_KEY;
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static int reiserfs_readdir(struct file *, struct dir_context *);
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static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
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int datasync);
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const struct file_operations reiserfs_dir_operations = {
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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.iterate_shared = reiserfs_readdir,
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.fsync = reiserfs_dir_fsync,
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.unlocked_ioctl = reiserfs_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = reiserfs_compat_ioctl,
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#endif
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};
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static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
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int datasync)
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{
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struct inode *inode = filp->f_mapping->host;
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int err;
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err = file_write_and_wait_range(filp, start, end);
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if (err)
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return err;
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inode_lock(inode);
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reiserfs_write_lock(inode->i_sb);
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err = reiserfs_commit_for_inode(inode);
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reiserfs_write_unlock(inode->i_sb);
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inode_unlock(inode);
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if (err < 0)
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return err;
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return 0;
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}
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#define store_ih(where,what) copy_item_head (where, what)
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static inline bool is_privroot_deh(struct inode *dir, struct reiserfs_de_head *deh)
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{
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struct dentry *privroot = REISERFS_SB(dir->i_sb)->priv_root;
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return (d_really_is_positive(privroot) &&
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deh->deh_objectid == INODE_PKEY(d_inode(privroot))->k_objectid);
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}
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int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx)
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{
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/* key of current position in the directory (key of directory entry) */
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struct cpu_key pos_key;
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INITIALIZE_PATH(path_to_entry);
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struct buffer_head *bh;
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int item_num, entry_num;
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const struct reiserfs_key *rkey;
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struct item_head *ih, tmp_ih;
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int search_res;
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char *local_buf;
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loff_t next_pos;
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char small_buf[32]; /* avoid kmalloc if we can */
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struct reiserfs_dir_entry de;
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int ret = 0;
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int depth;
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reiserfs_write_lock(inode->i_sb);
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reiserfs_check_lock_depth(inode->i_sb, "readdir");
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/*
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* form key for search the next directory entry using
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* f_pos field of file structure
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*/
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make_cpu_key(&pos_key, inode, ctx->pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3);
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next_pos = cpu_key_k_offset(&pos_key);
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path_to_entry.reada = PATH_READA;
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while (1) {
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research:
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/*
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* search the directory item, containing entry with
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* specified key
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*/
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search_res =
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search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
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&de);
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if (search_res == IO_ERROR) {
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/*
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* FIXME: we could just skip part of directory
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* which could not be read
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*/
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ret = -EIO;
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goto out;
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}
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entry_num = de.de_entry_num;
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bh = de.de_bh;
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item_num = de.de_item_num;
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ih = de.de_ih;
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store_ih(&tmp_ih, ih);
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/* we must have found item, that is item of this directory, */
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RFALSE(COMP_SHORT_KEYS(&ih->ih_key, &pos_key),
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"vs-9000: found item %h does not match to dir we readdir %K",
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ih, &pos_key);
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RFALSE(item_num > B_NR_ITEMS(bh) - 1,
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"vs-9005 item_num == %d, item amount == %d",
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item_num, B_NR_ITEMS(bh));
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/*
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* and entry must be not more than number of entries
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* in the item
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*/
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RFALSE(ih_entry_count(ih) < entry_num,
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"vs-9010: entry number is too big %d (%d)",
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entry_num, ih_entry_count(ih));
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/*
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* go through all entries in the directory item beginning
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* from the entry, that has been found
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*/
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if (search_res == POSITION_FOUND
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|| entry_num < ih_entry_count(ih)) {
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struct reiserfs_de_head *deh =
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B_I_DEH(bh, ih) + entry_num;
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for (; entry_num < ih_entry_count(ih);
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entry_num++, deh++) {
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int d_reclen;
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char *d_name;
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ino_t d_ino;
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loff_t cur_pos = deh_offset(deh);
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/* it is hidden entry */
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if (!de_visible(deh))
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continue;
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d_reclen = entry_length(bh, ih, entry_num);
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d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
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if (d_reclen <= 0 ||
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d_name + d_reclen > bh->b_data + bh->b_size) {
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/*
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* There is corrupted data in entry,
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* We'd better stop here
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*/
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pathrelse(&path_to_entry);
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ret = -EIO;
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goto out;
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}
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if (!d_name[d_reclen - 1])
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d_reclen = strlen(d_name);
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/* too big to send back to VFS */
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if (d_reclen >
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REISERFS_MAX_NAME(inode->i_sb->
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s_blocksize)) {
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continue;
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}
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/* Ignore the .reiserfs_priv entry */
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if (is_privroot_deh(inode, deh))
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continue;
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ctx->pos = deh_offset(deh);
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d_ino = deh_objectid(deh);
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if (d_reclen <= 32) {
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local_buf = small_buf;
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} else {
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local_buf = kmalloc(d_reclen,
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GFP_NOFS);
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if (!local_buf) {
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pathrelse(&path_to_entry);
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ret = -ENOMEM;
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goto out;
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}
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if (item_moved(&tmp_ih, &path_to_entry)) {
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kfree(local_buf);
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goto research;
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}
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}
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/*
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* Note, that we copy name to user space via
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* temporary buffer (local_buf) because
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* filldir will block if user space buffer is
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* swapped out. At that time entry can move to
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* somewhere else
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*/
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memcpy(local_buf, d_name, d_reclen);
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/*
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* Since filldir might sleep, we can release
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* the write lock here for other waiters
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*/
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depth = reiserfs_write_unlock_nested(inode->i_sb);
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if (!dir_emit
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(ctx, local_buf, d_reclen, d_ino,
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DT_UNKNOWN)) {
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reiserfs_write_lock_nested(inode->i_sb, depth);
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if (local_buf != small_buf) {
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kfree(local_buf);
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}
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goto end;
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}
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reiserfs_write_lock_nested(inode->i_sb, depth);
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if (local_buf != small_buf) {
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kfree(local_buf);
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}
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/* deh_offset(deh) may be invalid now. */
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next_pos = cur_pos + 1;
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if (item_moved(&tmp_ih, &path_to_entry)) {
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set_cpu_key_k_offset(&pos_key,
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next_pos);
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goto research;
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}
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} /* for */
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}
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/* end of directory has been reached */
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if (item_num != B_NR_ITEMS(bh) - 1)
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goto end;
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/*
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* item we went through is last item of node. Using right
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* delimiting key check is it directory end
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*/
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rkey = get_rkey(&path_to_entry, inode->i_sb);
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if (!comp_le_keys(rkey, &MIN_KEY)) {
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/*
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* set pos_key to key, that is the smallest and greater
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* that key of the last entry in the item
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*/
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set_cpu_key_k_offset(&pos_key, next_pos);
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continue;
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}
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/* end of directory has been reached */
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if (COMP_SHORT_KEYS(rkey, &pos_key)) {
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goto end;
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}
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/* directory continues in the right neighboring block */
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set_cpu_key_k_offset(&pos_key,
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le_key_k_offset(KEY_FORMAT_3_5, rkey));
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} /* while */
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end:
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ctx->pos = next_pos;
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pathrelse(&path_to_entry);
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reiserfs_check_path(&path_to_entry);
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out:
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reiserfs_write_unlock(inode->i_sb);
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return ret;
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}
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static int reiserfs_readdir(struct file *file, struct dir_context *ctx)
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{
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return reiserfs_readdir_inode(file_inode(file), ctx);
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}
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/*
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* compose directory item containing "." and ".." entries (entries are
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* not aligned to 4 byte boundary)
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*/
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void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
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__le32 par_dirid, __le32 par_objid)
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{
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struct reiserfs_de_head *dot, *dotdot;
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memset(body, 0, EMPTY_DIR_SIZE_V1);
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dot = (struct reiserfs_de_head *)body;
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dotdot = dot + 1;
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/* direntry header of "." */
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put_deh_offset(dot, DOT_OFFSET);
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/* these two are from make_le_item_head, and are LE */
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dot->deh_dir_id = dirid;
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dot->deh_objectid = objid;
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dot->deh_state = 0; /* Endian safe if 0 */
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put_deh_location(dot, EMPTY_DIR_SIZE_V1 - strlen("."));
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mark_de_visible(dot);
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/* direntry header of ".." */
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put_deh_offset(dotdot, DOT_DOT_OFFSET);
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/* key of ".." for the root directory */
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/* these two are from the inode, and are LE */
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dotdot->deh_dir_id = par_dirid;
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dotdot->deh_objectid = par_objid;
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dotdot->deh_state = 0; /* Endian safe if 0 */
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put_deh_location(dotdot, deh_location(dot) - strlen(".."));
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mark_de_visible(dotdot);
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/* copy ".." and "." */
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memcpy(body + deh_location(dot), ".", 1);
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memcpy(body + deh_location(dotdot), "..", 2);
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}
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/* compose directory item containing "." and ".." entries */
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void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
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__le32 par_dirid, __le32 par_objid)
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{
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struct reiserfs_de_head *dot, *dotdot;
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memset(body, 0, EMPTY_DIR_SIZE);
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dot = (struct reiserfs_de_head *)body;
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dotdot = dot + 1;
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/* direntry header of "." */
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put_deh_offset(dot, DOT_OFFSET);
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/* these two are from make_le_item_head, and are LE */
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dot->deh_dir_id = dirid;
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dot->deh_objectid = objid;
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dot->deh_state = 0; /* Endian safe if 0 */
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put_deh_location(dot, EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
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mark_de_visible(dot);
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/* direntry header of ".." */
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put_deh_offset(dotdot, DOT_DOT_OFFSET);
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/* key of ".." for the root directory */
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/* these two are from the inode, and are LE */
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dotdot->deh_dir_id = par_dirid;
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dotdot->deh_objectid = par_objid;
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dotdot->deh_state = 0; /* Endian safe if 0 */
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put_deh_location(dotdot, deh_location(dot) - ROUND_UP(strlen("..")));
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mark_de_visible(dotdot);
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/* copy ".." and "." */
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memcpy(body + deh_location(dot), ".", 1);
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memcpy(body + deh_location(dotdot), "..", 2);
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}
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