/* * reiserfs_unpack * Function try to convert tail from direct item into indirect. * It set up nopack attribute in the REISERFS_I(inode)->nopack */ int reiserfs_unpack(struct inode *inode, struct file *filp) { int retval = 0; int index; struct page *page; struct address_space *mapping; unsigned long write_from; unsigned long blocksize = inode->i_sb->s_blocksize; if (inode->i_size == 0) { REISERFS_I(inode)->i_flags |= i_nopack_mask; return 0; } /* ioctl already done */ if (REISERFS_I(inode)->i_flags & i_nopack_mask) { return 0; } /* we need to make sure nobody is changing the file size beneath us */ { int depth = reiserfs_write_unlock_nested(inode->i_sb); inode_lock(inode); reiserfs_write_lock_nested(inode->i_sb, depth); } reiserfs_write_lock(inode->i_sb); write_from = inode->i_size & (blocksize - 1); /* if we are on a block boundary, we are already unpacked. */ if (write_from == 0) { REISERFS_I(inode)->i_flags |= i_nopack_mask; goto out; } /* * we unpack by finding the page with the tail, and calling * __reiserfs_write_begin on that page. This will force a * reiserfs_get_block to unpack the tail for us. */ index = inode->i_size >> PAGE_SHIFT; mapping = inode->i_mapping; page = grab_cache_page(mapping, index); retval = -ENOMEM; if (!page) { goto out; } retval = __reiserfs_write_begin(page, write_from, 0); if (retval) goto out_unlock; /* conversion can change page contents, must flush */ flush_dcache_page(page); retval = reiserfs_commit_write(NULL, page, write_from, write_from); REISERFS_I(inode)->i_flags |= i_nopack_mask; out_unlock: unlock_page(page); put_page(page); out: inode_unlock(inode); reiserfs_write_unlock(inode->i_sb); return retval; }
int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) { /* key of current position in the directory (key of directory entry) */ struct cpu_key pos_key; INITIALIZE_PATH(path_to_entry); struct buffer_head *bh; int item_num, entry_num; const struct reiserfs_key *rkey; struct item_head *ih, tmp_ih; int search_res; char *local_buf; loff_t next_pos; char small_buf[32]; /* avoid kmalloc if we can */ struct reiserfs_dir_entry de; int ret = 0; int depth; reiserfs_write_lock(inode->i_sb); reiserfs_check_lock_depth(inode->i_sb, "readdir"); /* * form key for search the next directory entry using * f_pos field of file structure */ make_cpu_key(&pos_key, inode, ctx->pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); next_pos = cpu_key_k_offset(&pos_key); path_to_entry.reada = PATH_READA; while (1) { research: /* * search the directory item, containing entry with * specified key */ search_res = search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, &de); if (search_res == IO_ERROR) { /* * FIXME: we could just skip part of directory * which could not be read */ ret = -EIO; goto out; } entry_num = de.de_entry_num; bh = de.de_bh; item_num = de.de_item_num; ih = de.de_ih; store_ih(&tmp_ih, ih); /* we must have found item, that is item of this directory, */ RFALSE(COMP_SHORT_KEYS(&ih->ih_key, &pos_key), "vs-9000: found item %h does not match to dir we readdir %K", ih, &pos_key); RFALSE(item_num > B_NR_ITEMS(bh) - 1, "vs-9005 item_num == %d, item amount == %d", item_num, B_NR_ITEMS(bh)); /* * and entry must be not more than number of entries * in the item */ RFALSE(ih_entry_count(ih) < entry_num, "vs-9010: entry number is too big %d (%d)", entry_num, ih_entry_count(ih)); /* * go through all entries in the directory item beginning * from the entry, that has been found */ if (search_res == POSITION_FOUND || entry_num < ih_entry_count(ih)) { struct reiserfs_de_head *deh = B_I_DEH(bh, ih) + entry_num; for (; entry_num < ih_entry_count(ih); entry_num++, deh++) { int d_reclen; char *d_name; ino_t d_ino; loff_t cur_pos = deh_offset(deh); /* it is hidden entry */ if (!de_visible(deh)) continue; d_reclen = entry_length(bh, ih, entry_num); d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); if (d_reclen <= 0 || d_name + d_reclen > bh->b_data + bh->b_size) { /* * There is corrupted data in entry, * We'd better stop here */ pathrelse(&path_to_entry); ret = -EIO; goto out; } if (!d_name[d_reclen - 1]) d_reclen = strlen(d_name); /* too big to send back to VFS */ if (d_reclen > REISERFS_MAX_NAME(inode->i_sb-> s_blocksize)) { continue; } /* Ignore the .reiserfs_priv entry */ if (is_privroot_deh(inode, deh)) continue; ctx->pos = deh_offset(deh); d_ino = deh_objectid(deh); if (d_reclen <= 32) { local_buf = small_buf; } else { local_buf = kmalloc(d_reclen, GFP_NOFS); if (!local_buf) { pathrelse(&path_to_entry); ret = -ENOMEM; goto out; } if (item_moved(&tmp_ih, &path_to_entry)) { kfree(local_buf); goto research; } } /* * Note, that we copy name to user space via * temporary buffer (local_buf) because * filldir will block if user space buffer is * swapped out. At that time entry can move to * somewhere else */ memcpy(local_buf, d_name, d_reclen); /* * Since filldir might sleep, we can release * the write lock here for other waiters */ depth = reiserfs_write_unlock_nested(inode->i_sb); if (!dir_emit (ctx, local_buf, d_reclen, d_ino, DT_UNKNOWN)) { reiserfs_write_lock_nested(inode->i_sb, depth); if (local_buf != small_buf) { kfree(local_buf); } goto end; } reiserfs_write_lock_nested(inode->i_sb, depth); if (local_buf != small_buf) { kfree(local_buf); } /* deh_offset(deh) may be invalid now. */ next_pos = cur_pos + 1; if (item_moved(&tmp_ih, &path_to_entry)) { set_cpu_key_k_offset(&pos_key, next_pos); goto research; } } /* for */ } /* end of directory has been reached */ if (item_num != B_NR_ITEMS(bh) - 1) goto end; /* * item we went through is last item of node. Using right * delimiting key check is it directory end */ rkey = get_rkey(&path_to_entry, inode->i_sb); if (!comp_le_keys(rkey, &MIN_KEY)) { /* * set pos_key to key, that is the smallest and greater * that key of the last entry in the item */ set_cpu_key_k_offset(&pos_key, next_pos); continue; } /* end of directory has been reached */ if (COMP_SHORT_KEYS(rkey, &pos_key)) { goto end; } /* directory continues in the right neighboring block */ set_cpu_key_k_offset(&pos_key, le_key_k_offset(KEY_FORMAT_3_5, rkey)); } /* while */ end: ctx->pos = next_pos; pathrelse(&path_to_entry); reiserfs_check_path(&path_to_entry); out: reiserfs_write_unlock(inode->i_sb); return ret; }