c69ab1a2cf
The patch below fixes some typos, and makes some comments sound more proper. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2051 lines
49 KiB
C
2051 lines
49 KiB
C
/*
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* 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/backing-dev.h>
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#include <linux/crypto.h>
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#include <linux/fs.h>
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#include <linux/jhash.h>
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#include <linux/hash.h>
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#include <linux/ktime.h>
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#include <linux/mm.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/parser.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/writeback.h>
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#include "netfs.h"
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#define POHMELFS_MAGIC_NUM 0x504f482e
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static struct kmem_cache *pohmelfs_inode_cache;
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static atomic_t psb_bdi_num = ATOMIC_INIT(0);
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/*
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* Removes inode from all trees, drops local name cache and removes all queued
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* requests for object removal.
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*/
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void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi)
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{
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mutex_lock(&pi->offset_lock);
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pohmelfs_free_names(pi);
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mutex_unlock(&pi->offset_lock);
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dprintk("%s: deleted stuff in ino: %llu.\n", __func__, pi->ino);
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}
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/*
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* Sync inode to server.
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* Returns zero in success and negative error value otherwise.
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* It will gather path to root directory into structures containing
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* creation mode, permissions and names, so that the whole path
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* to given inode could be created using only single network command.
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*/
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int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans)
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{
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
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int err = -ENOMEM, size;
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struct netfs_cmd *cmd;
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void *data;
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int cur_len = netfs_trans_cur_len(trans);
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if (unlikely(cur_len < 0))
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return -ETOOSMALL;
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cmd = netfs_trans_current(trans);
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cur_len -= sizeof(struct netfs_cmd);
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data = (void *)(cmd + 1);
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err = pohmelfs_construct_path_string(pi, data, cur_len);
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if (err < 0)
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goto err_out_exit;
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size = err;
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cmd->start = i_size_read(inode);
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cmd->cmd = NETFS_CREATE;
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cmd->size = size;
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cmd->id = pi->ino;
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cmd->ext = inode->i_mode;
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netfs_convert_cmd(cmd);
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netfs_trans_update(cmd, trans, size);
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return 0;
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err_out_exit:
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printk("%s: completed ino: %llu, err: %d.\n", __func__, pi->ino, err);
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return err;
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}
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static int pohmelfs_write_trans_complete(struct page **pages, unsigned int page_num,
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void *private, int err)
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{
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unsigned i;
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dprintk("%s: pages: %lu-%lu, page_num: %u, err: %d.\n",
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__func__, pages[0]->index, pages[page_num-1]->index,
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page_num, err);
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for (i = 0; i < page_num; i++) {
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struct page *page = pages[i];
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if (!page)
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continue;
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end_page_writeback(page);
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if (err < 0) {
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SetPageError(page);
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set_page_dirty(page);
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}
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unlock_page(page);
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page_cache_release(page);
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/* dprintk("%s: %3u/%u: page: %p.\n", __func__, i, page_num, page); */
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}
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return err;
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}
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static int pohmelfs_inode_has_dirty_pages(struct address_space *mapping, pgoff_t index)
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{
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int ret;
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struct page *page;
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rcu_read_lock();
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ret = radix_tree_gang_lookup_tag(&mapping->page_tree,
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(void **)&page, index, 1, PAGECACHE_TAG_DIRTY);
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rcu_read_unlock();
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return ret;
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}
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static int pohmelfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
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{
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struct inode *inode = mapping->host;
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
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struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
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int err = 0;
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int done = 0;
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int nr_pages;
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pgoff_t index;
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pgoff_t end; /* Inclusive */
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int scanned = 0;
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int range_whole = 0;
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if (wbc->range_cyclic) {
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index = mapping->writeback_index; /* Start from prev offset */
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end = -1;
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} else {
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index = wbc->range_start >> PAGE_CACHE_SHIFT;
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end = wbc->range_end >> PAGE_CACHE_SHIFT;
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if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
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range_whole = 1;
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scanned = 1;
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}
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retry:
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while (!done && (index <= end)) {
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unsigned int i = min(end - index, (pgoff_t)psb->trans_max_pages);
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int path_len;
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struct netfs_trans *trans;
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err = pohmelfs_inode_has_dirty_pages(mapping, index);
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if (!err)
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break;
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err = pohmelfs_path_length(pi);
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if (err < 0)
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break;
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path_len = err;
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if (path_len <= 2) {
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err = -ENOENT;
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break;
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}
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trans = netfs_trans_alloc(psb, path_len, 0, i);
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if (!trans) {
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err = -ENOMEM;
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break;
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}
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trans->complete = &pohmelfs_write_trans_complete;
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trans->page_num = nr_pages = find_get_pages_tag(mapping, &index,
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PAGECACHE_TAG_DIRTY, trans->page_num,
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trans->pages);
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dprintk("%s: t: %p, nr_pages: %u, end: %lu, index: %lu, max: %u.\n",
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__func__, trans, nr_pages, end, index, trans->page_num);
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if (!nr_pages)
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goto err_out_reset;
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err = pohmelfs_write_inode_create(inode, trans);
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if (err)
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goto err_out_reset;
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err = 0;
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scanned = 1;
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for (i = 0; i < trans->page_num; i++) {
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struct page *page = trans->pages[i];
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lock_page(page);
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if (unlikely(page->mapping != mapping))
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goto out_continue;
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if (!wbc->range_cyclic && page->index > end) {
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done = 1;
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goto out_continue;
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}
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if (wbc->sync_mode != WB_SYNC_NONE)
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wait_on_page_writeback(page);
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if (PageWriteback(page) ||
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!clear_page_dirty_for_io(page)) {
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dprintk("%s: not clear for io page: %p, writeback: %d.\n",
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__func__, page, PageWriteback(page));
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goto out_continue;
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}
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set_page_writeback(page);
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trans->attached_size += page_private(page);
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trans->attached_pages++;
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#if 0
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dprintk("%s: %u/%u added trans: %p, gen: %u, page: %p, [High: %d], size: %lu, idx: %lu.\n",
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__func__, i, trans->page_num, trans, trans->gen, page,
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!!PageHighMem(page), page_private(page), page->index);
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#endif
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wbc->nr_to_write--;
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if (wbc->nr_to_write <= 0)
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done = 1;
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continue;
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out_continue:
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unlock_page(page);
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trans->pages[i] = NULL;
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}
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err = netfs_trans_finish(trans, psb);
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if (err)
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break;
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continue;
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err_out_reset:
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trans->result = err;
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netfs_trans_reset(trans);
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netfs_trans_put(trans);
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break;
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}
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if (!scanned && !done) {
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/*
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* We hit the last page and there is more work to be done: wrap
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* back to the start of the file
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*/
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scanned = 1;
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index = 0;
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goto retry;
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}
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if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
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mapping->writeback_index = index;
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return err;
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}
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/*
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* Inode writeback creation completion callback.
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* Only invoked for just created inodes, which do not have pages attached,
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* like dirs and empty files.
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*/
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static int pohmelfs_write_inode_complete(struct page **pages, unsigned int page_num,
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void *private, int err)
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{
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struct inode *inode = private;
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
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if (inode) {
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if (err) {
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mark_inode_dirty(inode);
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clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
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} else {
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set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
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}
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pohmelfs_put_inode(pi);
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}
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return err;
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}
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int pohmelfs_write_create_inode(struct pohmelfs_inode *pi)
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{
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struct netfs_trans *t;
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struct inode *inode = &pi->vfs_inode;
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struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
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int err;
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if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
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return 0;
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dprintk("%s: started ino: %llu.\n", __func__, pi->ino);
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err = pohmelfs_path_length(pi);
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if (err < 0)
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goto err_out_exit;
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t = netfs_trans_alloc(psb, err + 1, 0, 0);
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if (!t) {
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err = -ENOMEM;
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goto err_out_exit;
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}
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t->complete = pohmelfs_write_inode_complete;
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t->private = igrab(inode);
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if (!t->private) {
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err = -ENOENT;
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goto err_out_put;
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}
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err = pohmelfs_write_inode_create(inode, t);
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if (err)
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goto err_out_put;
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netfs_trans_finish(t, POHMELFS_SB(inode->i_sb));
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return 0;
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err_out_put:
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t->result = err;
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netfs_trans_put(t);
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err_out_exit:
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return err;
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}
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/*
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* Sync all not-yet-created children in given directory to the server.
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*/
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static int pohmelfs_write_inode_create_children(struct inode *inode)
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{
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struct pohmelfs_inode *parent = POHMELFS_I(inode);
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struct super_block *sb = inode->i_sb;
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struct pohmelfs_name *n;
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while (!list_empty(&parent->sync_create_list)) {
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n = NULL;
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mutex_lock(&parent->offset_lock);
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if (!list_empty(&parent->sync_create_list)) {
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n = list_first_entry(&parent->sync_create_list,
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struct pohmelfs_name, sync_create_entry);
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list_del_init(&n->sync_create_entry);
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}
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mutex_unlock(&parent->offset_lock);
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if (!n)
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break;
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inode = ilookup(sb, n->ino);
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dprintk("%s: parent: %llu, ino: %llu, inode: %p.\n",
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__func__, parent->ino, n->ino, inode);
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if (inode && (inode->i_state & I_DIRTY)) {
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
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pohmelfs_write_create_inode(pi);
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/* pohmelfs_meta_command(pi, NETFS_INODE_INFO, 0, NULL, NULL, 0); */
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iput(inode);
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}
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}
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return 0;
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}
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/*
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* Removes given child from given inode on server.
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*/
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int pohmelfs_remove_child(struct pohmelfs_inode *pi, struct pohmelfs_name *n)
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{
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return pohmelfs_meta_command_data(pi, pi->ino, NETFS_REMOVE, NULL, 0, NULL, NULL, 0);
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}
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/*
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* Writeback for given inode.
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*/
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static int pohmelfs_write_inode(struct inode *inode,
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struct writeback_control *wbc)
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{
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
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pohmelfs_write_create_inode(pi);
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pohmelfs_write_inode_create_children(inode);
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return 0;
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}
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|
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/*
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* It is not exported, sorry...
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*/
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static inline wait_queue_head_t *page_waitqueue(struct page *page)
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{
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const struct zone *zone = page_zone(page);
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return &zone->wait_table[hash_ptr(page, zone->wait_table_bits)];
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}
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|
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static int pohmelfs_wait_on_page_locked(struct page *page)
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{
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struct pohmelfs_sb *psb = POHMELFS_SB(page->mapping->host->i_sb);
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long ret = psb->wait_on_page_timeout;
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DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
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int err = 0;
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|
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if (!PageLocked(page))
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return 0;
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for (;;) {
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prepare_to_wait(page_waitqueue(page),
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&wait.wait, TASK_INTERRUPTIBLE);
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|
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dprintk("%s: page: %p, locked: %d, uptodate: %d, error: %d, flags: %lx.\n",
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__func__, page, PageLocked(page), PageUptodate(page),
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PageError(page), page->flags);
|
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|
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if (!PageLocked(page))
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break;
|
|
|
|
if (!signal_pending(current)) {
|
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ret = schedule_timeout(ret);
|
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if (!ret)
|
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break;
|
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continue;
|
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}
|
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ret = -ERESTARTSYS;
|
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break;
|
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}
|
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finish_wait(page_waitqueue(page), &wait.wait);
|
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|
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if (!ret)
|
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err = -ETIMEDOUT;
|
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|
|
|
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if (!err)
|
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SetPageUptodate(page);
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|
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if (err)
|
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printk("%s: page: %p, uptodate: %d, locked: %d, err: %d.\n",
|
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__func__, page, PageUptodate(page), PageLocked(page), err);
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|
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return err;
|
|
}
|
|
|
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static int pohmelfs_read_page_complete(struct page **pages, unsigned int page_num,
|
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void *private, int err)
|
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{
|
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struct page *page = private;
|
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|
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if (PageChecked(page))
|
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return err;
|
|
|
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if (err < 0) {
|
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dprintk("%s: page: %p, err: %d.\n", __func__, page, err);
|
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SetPageError(page);
|
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}
|
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|
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unlock_page(page);
|
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|
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return err;
|
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}
|
|
|
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/*
|
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* Read a page from remote server.
|
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* Function will wait until page is unlocked.
|
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*/
|
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static int pohmelfs_readpage(struct file *file, struct page *page)
|
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{
|
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struct inode *inode = page->mapping->host;
|
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struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
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struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
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struct netfs_trans *t;
|
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struct netfs_cmd *cmd;
|
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int err, path_len;
|
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void *data;
|
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u64 isize;
|
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|
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err = pohmelfs_data_lock(pi, page->index << PAGE_CACHE_SHIFT,
|
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PAGE_SIZE, POHMELFS_READ_LOCK);
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if (err)
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goto err_out_exit;
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|
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isize = i_size_read(inode);
|
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if (isize <= page->index << PAGE_CACHE_SHIFT) {
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SetPageUptodate(page);
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unlock_page(page);
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return 0;
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}
|
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|
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path_len = pohmelfs_path_length(pi);
|
|
if (path_len < 0) {
|
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err = path_len;
|
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goto err_out_exit;
|
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}
|
|
|
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t = netfs_trans_alloc(psb, path_len, NETFS_TRANS_SINGLE_DST, 0);
|
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if (!t) {
|
|
err = -ENOMEM;
|
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goto err_out_exit;
|
|
}
|
|
|
|
t->complete = pohmelfs_read_page_complete;
|
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t->private = page;
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|
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cmd = netfs_trans_current(t);
|
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data = (void *)(cmd + 1);
|
|
|
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err = pohmelfs_construct_path_string(pi, data, path_len);
|
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if (err < 0)
|
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goto err_out_free;
|
|
|
|
path_len = err;
|
|
|
|
cmd->id = pi->ino;
|
|
cmd->start = page->index;
|
|
cmd->start <<= PAGE_CACHE_SHIFT;
|
|
cmd->size = PAGE_CACHE_SIZE + path_len;
|
|
cmd->cmd = NETFS_READ_PAGE;
|
|
cmd->ext = path_len;
|
|
|
|
dprintk("%s: path: '%s', page: %p, ino: %llu, start: %llu, size: %lu.\n",
|
|
__func__, (char *)data, page, pi->ino, cmd->start, PAGE_CACHE_SIZE);
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, path_len);
|
|
|
|
err = netfs_trans_finish(t, psb);
|
|
if (err)
|
|
goto err_out_return;
|
|
|
|
return pohmelfs_wait_on_page_locked(page);
|
|
|
|
err_out_free:
|
|
t->result = err;
|
|
netfs_trans_put(t);
|
|
err_out_exit:
|
|
SetPageError(page);
|
|
if (PageLocked(page))
|
|
unlock_page(page);
|
|
err_out_return:
|
|
printk("%s: page: %p, start: %lu, size: %lu, err: %d.\n",
|
|
__func__, page, page->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Write begin/end magic.
|
|
* Allocates a page and writes inode if it was not synced to server before.
|
|
*/
|
|
static int pohmelfs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct page *page;
|
|
pgoff_t index;
|
|
unsigned start, end;
|
|
int err;
|
|
|
|
*pagep = NULL;
|
|
|
|
index = pos >> PAGE_CACHE_SHIFT;
|
|
start = pos & (PAGE_CACHE_SIZE - 1);
|
|
end = start + len;
|
|
|
|
page = grab_cache_page(mapping, index);
|
|
#if 0
|
|
dprintk("%s: page: %p pos: %llu, len: %u, index: %lu, start: %u, end: %u, uptodate: %d.\n",
|
|
__func__, page, pos, len, index, start, end, PageUptodate(page));
|
|
#endif
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
while (!PageUptodate(page)) {
|
|
if (start && test_bit(NETFS_INODE_REMOTE_SYNCED, &POHMELFS_I(inode)->state)) {
|
|
err = pohmelfs_readpage(file, page);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
lock_page(page);
|
|
continue;
|
|
}
|
|
|
|
if (len != PAGE_CACHE_SIZE) {
|
|
void *kaddr = kmap_atomic(page, KM_USER0);
|
|
|
|
memset(kaddr + start, 0, PAGE_CACHE_SIZE - start);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
SetPageUptodate(page);
|
|
}
|
|
|
|
set_page_private(page, end);
|
|
|
|
*pagep = page;
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
page_cache_release(page);
|
|
*pagep = NULL;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
|
|
if (copied != len) {
|
|
unsigned from = pos & (PAGE_CACHE_SIZE - 1);
|
|
void *kaddr = kmap_atomic(page, KM_USER0);
|
|
|
|
memset(kaddr + from + copied, 0, len - copied);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
|
|
SetPageUptodate(page);
|
|
set_page_dirty(page);
|
|
#if 0
|
|
dprintk("%s: page: %p [U: %d, D: %d, L: %d], pos: %llu, len: %u, copied: %u.\n",
|
|
__func__, page,
|
|
PageUptodate(page), PageDirty(page), PageLocked(page),
|
|
pos, len, copied);
|
|
#endif
|
|
flush_dcache_page(page);
|
|
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
if (pos + copied > inode->i_size) {
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
|
|
|
psb->avail_size -= pos + copied - inode->i_size;
|
|
|
|
i_size_write(inode, pos + copied);
|
|
}
|
|
|
|
return copied;
|
|
}
|
|
|
|
static int pohmelfs_readpages_trans_complete(struct page **__pages, unsigned int page_num,
|
|
void *private, int err)
|
|
{
|
|
struct pohmelfs_inode *pi = private;
|
|
unsigned int i, num;
|
|
struct page **pages, *page = (struct page *)__pages;
|
|
loff_t index = page->index;
|
|
|
|
pages = kzalloc(sizeof(void *) * page_num, GFP_NOIO);
|
|
if (!pages)
|
|
return -ENOMEM;
|
|
|
|
num = find_get_pages_contig(pi->vfs_inode.i_mapping, index, page_num, pages);
|
|
if (num <= 0) {
|
|
err = num;
|
|
goto err_out_free;
|
|
}
|
|
|
|
for (i = 0; i < num; ++i) {
|
|
page = pages[i];
|
|
|
|
if (err)
|
|
printk("%s: %u/%u: page: %p, index: %lu, uptodate: %d, locked: %d, err: %d.\n",
|
|
__func__, i, num, page, page->index,
|
|
PageUptodate(page), PageLocked(page), err);
|
|
|
|
if (!PageChecked(page)) {
|
|
if (err < 0)
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
}
|
|
page_cache_release(page);
|
|
page_cache_release(page);
|
|
}
|
|
|
|
err_out_free:
|
|
kfree(pages);
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_send_readpages(struct pohmelfs_inode *pi, struct page *first, unsigned int num)
|
|
{
|
|
struct netfs_trans *t;
|
|
struct netfs_cmd *cmd;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
|
|
int err, path_len;
|
|
void *data;
|
|
|
|
err = pohmelfs_data_lock(pi, first->index << PAGE_CACHE_SHIFT,
|
|
num * PAGE_SIZE, POHMELFS_READ_LOCK);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
path_len = pohmelfs_path_length(pi);
|
|
if (path_len < 0) {
|
|
err = path_len;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
t = netfs_trans_alloc(psb, path_len, NETFS_TRANS_SINGLE_DST, 0);
|
|
if (!t) {
|
|
err = -ENOMEM;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
cmd = netfs_trans_current(t);
|
|
data = (void *)(cmd + 1);
|
|
|
|
t->complete = pohmelfs_readpages_trans_complete;
|
|
t->private = pi;
|
|
t->page_num = num;
|
|
t->pages = (struct page **)first;
|
|
|
|
err = pohmelfs_construct_path_string(pi, data, path_len);
|
|
if (err < 0)
|
|
goto err_out_put;
|
|
|
|
path_len = err;
|
|
|
|
cmd->cmd = NETFS_READ_PAGES;
|
|
cmd->start = first->index;
|
|
cmd->start <<= PAGE_CACHE_SHIFT;
|
|
cmd->size = (num << 8 | PAGE_CACHE_SHIFT);
|
|
cmd->id = pi->ino;
|
|
cmd->ext = path_len;
|
|
|
|
dprintk("%s: t: %p, gen: %u, path: '%s', path_len: %u, "
|
|
"start: %lu, num: %u.\n",
|
|
__func__, t, t->gen, (char *)data, path_len,
|
|
first->index, num);
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, path_len);
|
|
|
|
return netfs_trans_finish(t, psb);
|
|
|
|
err_out_put:
|
|
netfs_trans_free(t);
|
|
err_out_exit:
|
|
pohmelfs_readpages_trans_complete((struct page **)first, num, pi, err);
|
|
return err;
|
|
}
|
|
|
|
#define list_to_page(head) (list_entry((head)->prev, struct page, lru))
|
|
|
|
static int pohmelfs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
unsigned int page_idx, num = 0;
|
|
struct page *page = NULL, *first = NULL;
|
|
|
|
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
|
|
page = list_to_page(pages);
|
|
|
|
prefetchw(&page->flags);
|
|
list_del(&page->lru);
|
|
|
|
if (!add_to_page_cache_lru(page, mapping,
|
|
page->index, GFP_KERNEL)) {
|
|
|
|
if (!num) {
|
|
num = 1;
|
|
first = page;
|
|
continue;
|
|
}
|
|
|
|
dprintk("%s: added to lru page: %p, page_index: %lu, first_index: %lu.\n",
|
|
__func__, page, page->index, first->index);
|
|
|
|
if (unlikely(first->index + num != page->index) || (num > 500)) {
|
|
pohmelfs_send_readpages(POHMELFS_I(mapping->host),
|
|
first, num);
|
|
first = page;
|
|
num = 0;
|
|
}
|
|
|
|
num++;
|
|
}
|
|
}
|
|
pohmelfs_send_readpages(POHMELFS_I(mapping->host), first, num);
|
|
|
|
/*
|
|
* This will be sync read, so when last page is processed,
|
|
* all previous are alerady unlocked and ready to be used.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Small address space operations for POHMELFS.
|
|
*/
|
|
const struct address_space_operations pohmelfs_aops = {
|
|
.readpage = pohmelfs_readpage,
|
|
.readpages = pohmelfs_readpages,
|
|
.writepages = pohmelfs_writepages,
|
|
.write_begin = pohmelfs_write_begin,
|
|
.write_end = pohmelfs_write_end,
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
|
};
|
|
|
|
static void pohmelfs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
INIT_LIST_HEAD(&inode->i_dentry);
|
|
kmem_cache_free(pohmelfs_inode_cache, POHMELFS_I(inode));
|
|
}
|
|
|
|
/*
|
|
* ->destroy_inode() callback. Deletes inode from the caches
|
|
* and frees private data.
|
|
*/
|
|
static void pohmelfs_destroy_inode(struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(sb);
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
|
|
/* pohmelfs_data_unlock(pi, 0, inode->i_size, POHMELFS_READ_LOCK); */
|
|
|
|
pohmelfs_inode_del_inode(psb, pi);
|
|
|
|
dprintk("%s: pi: %p, inode: %p, ino: %llu.\n",
|
|
__func__, pi, &pi->vfs_inode, pi->ino);
|
|
atomic_long_dec(&psb->total_inodes);
|
|
call_rcu(&inode->i_rcu, pohmelfs_i_callback);
|
|
}
|
|
|
|
/*
|
|
* ->alloc_inode() callback. Allocates inode and initializes private data.
|
|
*/
|
|
static struct inode *pohmelfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct pohmelfs_inode *pi;
|
|
|
|
pi = kmem_cache_alloc(pohmelfs_inode_cache, GFP_NOIO);
|
|
if (!pi)
|
|
return NULL;
|
|
|
|
pi->hash_root = RB_ROOT;
|
|
mutex_init(&pi->offset_lock);
|
|
|
|
INIT_LIST_HEAD(&pi->sync_create_list);
|
|
|
|
INIT_LIST_HEAD(&pi->inode_entry);
|
|
|
|
pi->lock_type = 0;
|
|
pi->state = 0;
|
|
pi->total_len = 0;
|
|
pi->drop_count = 0;
|
|
|
|
dprintk("%s: pi: %p, inode: %p.\n", __func__, pi, &pi->vfs_inode);
|
|
|
|
atomic_long_inc(&POHMELFS_SB(sb)->total_inodes);
|
|
|
|
return &pi->vfs_inode;
|
|
}
|
|
|
|
/*
|
|
* We want fsync() to work on POHMELFS.
|
|
*/
|
|
static int pohmelfs_fsync(struct file *file, int datasync)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
return sync_inode_metadata(inode, 1);
|
|
}
|
|
|
|
ssize_t pohmelfs_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
|
|
struct kiocb kiocb;
|
|
ssize_t ret;
|
|
loff_t pos = *ppos;
|
|
|
|
init_sync_kiocb(&kiocb, file);
|
|
kiocb.ki_pos = pos;
|
|
kiocb.ki_left = len;
|
|
|
|
dprintk("%s: len: %zu, pos: %llu.\n", __func__, len, pos);
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
ret = pohmelfs_data_lock(pi, pos, len, POHMELFS_WRITE_LOCK);
|
|
if (ret)
|
|
goto err_out_unlock;
|
|
|
|
ret = __generic_file_aio_write(&kiocb, &iov, 1, &kiocb.ki_pos);
|
|
*ppos = kiocb.ki_pos;
|
|
|
|
mutex_unlock(&inode->i_mutex);
|
|
WARN_ON(ret < 0);
|
|
|
|
if (ret > 0) {
|
|
ssize_t err;
|
|
|
|
err = generic_write_sync(file, pos, ret);
|
|
if (err < 0)
|
|
ret = err;
|
|
WARN_ON(ret < 0);
|
|
}
|
|
|
|
return ret;
|
|
|
|
err_out_unlock:
|
|
mutex_unlock(&inode->i_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations pohmelfs_file_ops = {
|
|
.open = generic_file_open,
|
|
.fsync = pohmelfs_fsync,
|
|
|
|
.llseek = generic_file_llseek,
|
|
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
|
|
.mmap = generic_file_mmap,
|
|
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = generic_file_splice_write,
|
|
|
|
.write = pohmelfs_write,
|
|
.aio_write = generic_file_aio_write,
|
|
};
|
|
|
|
const struct inode_operations pohmelfs_symlink_inode_operations = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = page_follow_link_light,
|
|
.put_link = page_put_link,
|
|
};
|
|
|
|
int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr)
|
|
{
|
|
int err;
|
|
|
|
err = inode_change_ok(inode, attr);
|
|
if (err) {
|
|
dprintk("%s: ino: %llu, inode changes are not allowed.\n", __func__, POHMELFS_I(inode)->ino);
|
|
goto err_out_exit;
|
|
}
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
err = vmtruncate(inode, attr->ia_size);
|
|
if (err) {
|
|
dprintk("%s: ino: %llu, failed to set the attributes.\n", __func__, POHMELFS_I(inode)->ino);
|
|
goto err_out_exit;
|
|
}
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
|
|
dprintk("%s: ino: %llu, mode: %o -> %o, uid: %u -> %u, gid: %u -> %u, size: %llu -> %llu.\n",
|
|
__func__, POHMELFS_I(inode)->ino, inode->i_mode, attr->ia_mode,
|
|
inode->i_uid, attr->ia_uid, inode->i_gid, attr->ia_gid, inode->i_size, attr->ia_size);
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
int err;
|
|
|
|
err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_WRITE_LOCK);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
err = security_inode_setattr(dentry, attr);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
err = pohmelfs_setattr_raw(inode, attr);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_send_xattr_req(struct pohmelfs_inode *pi, u64 id, u64 start,
|
|
const char *name, const void *value, size_t attrsize, int command)
|
|
{
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
|
|
int err, path_len, namelen = strlen(name) + 1; /* 0-byte */
|
|
struct netfs_trans *t;
|
|
struct netfs_cmd *cmd;
|
|
void *data;
|
|
|
|
dprintk("%s: id: %llu, start: %llu, name: '%s', attrsize: %zu, cmd: %d.\n",
|
|
__func__, id, start, name, attrsize, command);
|
|
|
|
path_len = pohmelfs_path_length(pi);
|
|
if (path_len < 0) {
|
|
err = path_len;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
t = netfs_trans_alloc(psb, namelen + path_len + attrsize, 0, 0);
|
|
if (!t) {
|
|
err = -ENOMEM;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
cmd = netfs_trans_current(t);
|
|
data = cmd + 1;
|
|
|
|
path_len = pohmelfs_construct_path_string(pi, data, path_len);
|
|
if (path_len < 0) {
|
|
err = path_len;
|
|
goto err_out_put;
|
|
}
|
|
data += path_len;
|
|
|
|
/*
|
|
* 'name' is a NUL-terminated string already and
|
|
* 'namelen' includes 0-byte.
|
|
*/
|
|
memcpy(data, name, namelen);
|
|
data += namelen;
|
|
|
|
memcpy(data, value, attrsize);
|
|
|
|
cmd->cmd = command;
|
|
cmd->id = id;
|
|
cmd->start = start;
|
|
cmd->size = attrsize + namelen + path_len;
|
|
cmd->ext = path_len;
|
|
cmd->csize = 0;
|
|
cmd->cpad = 0;
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, namelen + path_len + attrsize);
|
|
|
|
return netfs_trans_finish(t, psb);
|
|
|
|
err_out_put:
|
|
t->result = err;
|
|
netfs_trans_put(t);
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_setxattr(struct dentry *dentry, const char *name,
|
|
const void *value, size_t attrsize, int flags)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
|
|
|
if (!(psb->state_flags & POHMELFS_FLAGS_XATTR))
|
|
return -EOPNOTSUPP;
|
|
|
|
return pohmelfs_send_xattr_req(pi, flags, attrsize, name,
|
|
value, attrsize, NETFS_XATTR_SET);
|
|
}
|
|
|
|
static ssize_t pohmelfs_getxattr(struct dentry *dentry, const char *name,
|
|
void *value, size_t attrsize)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
|
struct pohmelfs_mcache *m;
|
|
int err;
|
|
long timeout = psb->mcache_timeout;
|
|
|
|
if (!(psb->state_flags & POHMELFS_FLAGS_XATTR))
|
|
return -EOPNOTSUPP;
|
|
|
|
m = pohmelfs_mcache_alloc(psb, 0, attrsize, value);
|
|
if (IS_ERR(m))
|
|
return PTR_ERR(m);
|
|
|
|
dprintk("%s: ino: %llu, name: '%s', size: %zu.\n",
|
|
__func__, pi->ino, name, attrsize);
|
|
|
|
err = pohmelfs_send_xattr_req(pi, m->gen, attrsize, name, value, 0, NETFS_XATTR_GET);
|
|
if (err)
|
|
goto err_out_put;
|
|
|
|
do {
|
|
err = wait_for_completion_timeout(&m->complete, timeout);
|
|
if (err) {
|
|
err = m->err;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* This loop is a bit ugly, since it waits until reference counter
|
|
* hits 1 and then puts the object here. Main goal is to prevent race with
|
|
* the network thread, when it can start processing the given request, i.e.
|
|
* increase its reference counter but yet not complete it, while
|
|
* we will exit from ->getxattr() with timeout, and although request
|
|
* will not be freed (its reference counter was increased by network
|
|
* thread), data pointer provided by user may be released, so we will
|
|
* overwrite an already freed area in the network thread.
|
|
*
|
|
* Now after timeout we remove request from the cache, so it can not be
|
|
* found by network thread, and wait for its reference counter to hit 1,
|
|
* i.e. if network thread already started to process this request, we wait
|
|
* for it to finish, and then free object locally. If reference counter is
|
|
* already 1, i.e. request is not used by anyone else, we can free it without
|
|
* problem.
|
|
*/
|
|
err = -ETIMEDOUT;
|
|
timeout = HZ;
|
|
|
|
pohmelfs_mcache_remove_locked(psb, m);
|
|
} while (atomic_read(&m->refcnt) != 1);
|
|
|
|
pohmelfs_mcache_put(psb, m);
|
|
|
|
dprintk("%s: ino: %llu, err: %d.\n", __func__, pi->ino, err);
|
|
|
|
return err;
|
|
|
|
err_out_put:
|
|
pohmelfs_mcache_put(psb, m);
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
#if 0
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
int err;
|
|
|
|
err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK);
|
|
if (err)
|
|
return err;
|
|
dprintk("%s: ino: %llu, mode: %o, uid: %u, gid: %u, size: %llu.\n",
|
|
__func__, pi->ino, inode->i_mode, inode->i_uid,
|
|
inode->i_gid, inode->i_size);
|
|
#endif
|
|
|
|
generic_fillattr(inode, stat);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations pohmelfs_file_inode_operations = {
|
|
.setattr = pohmelfs_setattr,
|
|
.getattr = pohmelfs_getattr,
|
|
.setxattr = pohmelfs_setxattr,
|
|
.getxattr = pohmelfs_getxattr,
|
|
};
|
|
|
|
/*
|
|
* Fill inode data: mode, size, operation callbacks and so on...
|
|
*/
|
|
void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info)
|
|
{
|
|
inode->i_mode = info->mode;
|
|
inode->i_nlink = info->nlink;
|
|
inode->i_uid = info->uid;
|
|
inode->i_gid = info->gid;
|
|
inode->i_blocks = info->blocks;
|
|
inode->i_rdev = info->rdev;
|
|
inode->i_size = info->size;
|
|
inode->i_version = info->version;
|
|
inode->i_blkbits = ffs(info->blocksize);
|
|
|
|
dprintk("%s: inode: %p, num: %lu/%llu inode is regular: %d, dir: %d, link: %d, mode: %o, size: %llu.\n",
|
|
__func__, inode, inode->i_ino, info->ino,
|
|
S_ISREG(inode->i_mode), S_ISDIR(inode->i_mode),
|
|
S_ISLNK(inode->i_mode), inode->i_mode, inode->i_size);
|
|
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
|
|
/*
|
|
* i_mapping is a pointer to i_data during inode initialization.
|
|
*/
|
|
inode->i_data.a_ops = &pohmelfs_aops;
|
|
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_fop = &pohmelfs_file_ops;
|
|
inode->i_op = &pohmelfs_file_inode_operations;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_fop = &pohmelfs_dir_fops;
|
|
inode->i_op = &pohmelfs_dir_inode_ops;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &pohmelfs_symlink_inode_operations;
|
|
inode->i_fop = &pohmelfs_file_ops;
|
|
} else {
|
|
inode->i_fop = &generic_ro_fops;
|
|
}
|
|
}
|
|
|
|
static int pohmelfs_drop_inode(struct inode *inode)
|
|
{
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
|
struct pohmelfs_inode *pi = POHMELFS_I(inode);
|
|
|
|
spin_lock(&psb->ino_lock);
|
|
list_del_init(&pi->inode_entry);
|
|
spin_unlock(&psb->ino_lock);
|
|
|
|
return generic_drop_inode(inode);
|
|
}
|
|
|
|
static struct pohmelfs_inode *pohmelfs_get_inode_from_list(struct pohmelfs_sb *psb,
|
|
struct list_head *head, unsigned int *count)
|
|
{
|
|
struct pohmelfs_inode *pi = NULL;
|
|
|
|
spin_lock(&psb->ino_lock);
|
|
if (!list_empty(head)) {
|
|
pi = list_entry(head->next, struct pohmelfs_inode,
|
|
inode_entry);
|
|
list_del_init(&pi->inode_entry);
|
|
*count = pi->drop_count;
|
|
pi->drop_count = 0;
|
|
}
|
|
spin_unlock(&psb->ino_lock);
|
|
|
|
return pi;
|
|
}
|
|
|
|
static void pohmelfs_flush_transactions(struct pohmelfs_sb *psb)
|
|
{
|
|
struct pohmelfs_config *c;
|
|
|
|
mutex_lock(&psb->state_lock);
|
|
list_for_each_entry(c, &psb->state_list, config_entry) {
|
|
pohmelfs_state_flush_transactions(&c->state);
|
|
}
|
|
mutex_unlock(&psb->state_lock);
|
|
}
|
|
|
|
/*
|
|
* ->put_super() callback. Invoked before superblock is destroyed,
|
|
* so it has to clean all private data.
|
|
*/
|
|
static void pohmelfs_put_super(struct super_block *sb)
|
|
{
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(sb);
|
|
struct pohmelfs_inode *pi;
|
|
unsigned int count = 0;
|
|
unsigned int in_drop_list = 0;
|
|
struct inode *inode, *tmp;
|
|
|
|
dprintk("%s.\n", __func__);
|
|
|
|
/*
|
|
* Kill pending transactions, which could affect inodes in-flight.
|
|
*/
|
|
pohmelfs_flush_transactions(psb);
|
|
|
|
while ((pi = pohmelfs_get_inode_from_list(psb, &psb->drop_list, &count))) {
|
|
inode = &pi->vfs_inode;
|
|
|
|
dprintk("%s: ino: %llu, pi: %p, inode: %p, count: %u.\n",
|
|
__func__, pi->ino, pi, inode, count);
|
|
|
|
if (atomic_read(&inode->i_count) != count) {
|
|
printk("%s: ino: %llu, pi: %p, inode: %p, count: %u, i_count: %d.\n",
|
|
__func__, pi->ino, pi, inode, count,
|
|
atomic_read(&inode->i_count));
|
|
count = atomic_read(&inode->i_count);
|
|
in_drop_list++;
|
|
}
|
|
|
|
while (count--)
|
|
iput(&pi->vfs_inode);
|
|
}
|
|
|
|
list_for_each_entry_safe(inode, tmp, &sb->s_inodes, i_sb_list) {
|
|
pi = POHMELFS_I(inode);
|
|
|
|
dprintk("%s: ino: %llu, pi: %p, inode: %p, i_count: %u.\n",
|
|
__func__, pi->ino, pi, inode, atomic_read(&inode->i_count));
|
|
|
|
/*
|
|
* These are special inodes, they were created during
|
|
* directory reading or lookup, and were not bound to dentry,
|
|
* so they live here with reference counter being 1 and prevent
|
|
* umount from succeed since it believes that they are busy.
|
|
*/
|
|
count = atomic_read(&inode->i_count);
|
|
if (count) {
|
|
list_del_init(&inode->i_sb_list);
|
|
while (count--)
|
|
iput(&pi->vfs_inode);
|
|
}
|
|
}
|
|
|
|
psb->trans_scan_timeout = psb->drop_scan_timeout = 0;
|
|
cancel_delayed_work_sync(&psb->dwork);
|
|
cancel_delayed_work_sync(&psb->drop_dwork);
|
|
flush_scheduled_work();
|
|
|
|
dprintk("%s: stopped workqueues.\n", __func__);
|
|
|
|
pohmelfs_crypto_exit(psb);
|
|
pohmelfs_state_exit(psb);
|
|
|
|
bdi_destroy(&psb->bdi);
|
|
|
|
kfree(psb);
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
static int pohmelfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(sb);
|
|
|
|
/*
|
|
* There are no filesystem size limits yet.
|
|
*/
|
|
memset(buf, 0, sizeof(struct kstatfs));
|
|
|
|
buf->f_type = POHMELFS_MAGIC_NUM; /* 'POH.' */
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_files = psb->ino;
|
|
buf->f_namelen = 255;
|
|
buf->f_files = atomic_long_read(&psb->total_inodes);
|
|
buf->f_bfree = buf->f_bavail = psb->avail_size >> PAGE_SHIFT;
|
|
buf->f_blocks = psb->total_size >> PAGE_SHIFT;
|
|
|
|
dprintk("%s: total: %llu, avail: %llu, inodes: %llu, bsize: %lu.\n",
|
|
__func__, psb->total_size, psb->avail_size, buf->f_files, sb->s_blocksize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pohmelfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
|
|
{
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(vfs->mnt_sb);
|
|
|
|
seq_printf(seq, ",idx=%u", psb->idx);
|
|
seq_printf(seq, ",trans_scan_timeout=%u", jiffies_to_msecs(psb->trans_scan_timeout));
|
|
seq_printf(seq, ",drop_scan_timeout=%u", jiffies_to_msecs(psb->drop_scan_timeout));
|
|
seq_printf(seq, ",wait_on_page_timeout=%u", jiffies_to_msecs(psb->wait_on_page_timeout));
|
|
seq_printf(seq, ",trans_retries=%u", psb->trans_retries);
|
|
seq_printf(seq, ",crypto_thread_num=%u", psb->crypto_thread_num);
|
|
seq_printf(seq, ",trans_max_pages=%u", psb->trans_max_pages);
|
|
seq_printf(seq, ",mcache_timeout=%u", jiffies_to_msecs(psb->mcache_timeout));
|
|
if (psb->crypto_fail_unsupported)
|
|
seq_printf(seq, ",crypto_fail_unsupported");
|
|
|
|
return 0;
|
|
}
|
|
|
|
enum {
|
|
pohmelfs_opt_idx,
|
|
pohmelfs_opt_crypto_thread_num,
|
|
pohmelfs_opt_trans_max_pages,
|
|
pohmelfs_opt_crypto_fail_unsupported,
|
|
|
|
/* Remountable options */
|
|
pohmelfs_opt_trans_scan_timeout,
|
|
pohmelfs_opt_drop_scan_timeout,
|
|
pohmelfs_opt_wait_on_page_timeout,
|
|
pohmelfs_opt_trans_retries,
|
|
pohmelfs_opt_mcache_timeout,
|
|
};
|
|
|
|
static struct match_token pohmelfs_tokens[] = {
|
|
{pohmelfs_opt_idx, "idx=%u"},
|
|
{pohmelfs_opt_crypto_thread_num, "crypto_thread_num=%u"},
|
|
{pohmelfs_opt_trans_max_pages, "trans_max_pages=%u"},
|
|
{pohmelfs_opt_crypto_fail_unsupported, "crypto_fail_unsupported"},
|
|
{pohmelfs_opt_trans_scan_timeout, "trans_scan_timeout=%u"},
|
|
{pohmelfs_opt_drop_scan_timeout, "drop_scan_timeout=%u"},
|
|
{pohmelfs_opt_wait_on_page_timeout, "wait_on_page_timeout=%u"},
|
|
{pohmelfs_opt_trans_retries, "trans_retries=%u"},
|
|
{pohmelfs_opt_mcache_timeout, "mcache_timeout=%u"},
|
|
};
|
|
|
|
static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb, int remount)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option, err;
|
|
|
|
if (!options)
|
|
return 0;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, pohmelfs_tokens, args);
|
|
|
|
err = match_int(&args[0], &option);
|
|
if (err)
|
|
return err;
|
|
|
|
if (remount && token <= pohmelfs_opt_crypto_fail_unsupported)
|
|
continue;
|
|
|
|
switch (token) {
|
|
case pohmelfs_opt_idx:
|
|
psb->idx = option;
|
|
break;
|
|
case pohmelfs_opt_trans_scan_timeout:
|
|
psb->trans_scan_timeout = msecs_to_jiffies(option);
|
|
break;
|
|
case pohmelfs_opt_drop_scan_timeout:
|
|
psb->drop_scan_timeout = msecs_to_jiffies(option);
|
|
break;
|
|
case pohmelfs_opt_wait_on_page_timeout:
|
|
psb->wait_on_page_timeout = msecs_to_jiffies(option);
|
|
break;
|
|
case pohmelfs_opt_mcache_timeout:
|
|
psb->mcache_timeout = msecs_to_jiffies(option);
|
|
break;
|
|
case pohmelfs_opt_trans_retries:
|
|
psb->trans_retries = option;
|
|
break;
|
|
case pohmelfs_opt_crypto_thread_num:
|
|
psb->crypto_thread_num = option;
|
|
break;
|
|
case pohmelfs_opt_trans_max_pages:
|
|
psb->trans_max_pages = option;
|
|
break;
|
|
case pohmelfs_opt_crypto_fail_unsupported:
|
|
psb->crypto_fail_unsupported = 1;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pohmelfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
int err;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(sb);
|
|
unsigned long old_sb_flags = sb->s_flags;
|
|
|
|
err = pohmelfs_parse_options(data, psb, 1);
|
|
if (err)
|
|
goto err_out_restore;
|
|
|
|
if (!(*flags & MS_RDONLY))
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
return 0;
|
|
|
|
err_out_restore:
|
|
sb->s_flags = old_sb_flags;
|
|
return err;
|
|
}
|
|
|
|
static void pohmelfs_flush_inode(struct pohmelfs_inode *pi, unsigned int count)
|
|
{
|
|
struct inode *inode = &pi->vfs_inode;
|
|
|
|
dprintk("%s: %p: ino: %llu, owned: %d.\n",
|
|
__func__, inode, pi->ino, test_bit(NETFS_INODE_OWNED, &pi->state));
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
if (test_and_clear_bit(NETFS_INODE_OWNED, &pi->state)) {
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
inode->i_sb->s_op->write_inode(inode, 0);
|
|
}
|
|
|
|
#ifdef POHMELFS_TRUNCATE_ON_INODE_FLUSH
|
|
truncate_inode_pages(inode->i_mapping, 0);
|
|
#endif
|
|
|
|
pohmelfs_data_unlock(pi, 0, ~0, POHMELFS_WRITE_LOCK);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
|
|
static void pohmelfs_put_inode_count(struct pohmelfs_inode *pi, unsigned int count)
|
|
{
|
|
dprintk("%s: ino: %llu, pi: %p, inode: %p, count: %u.\n",
|
|
__func__, pi->ino, pi, &pi->vfs_inode, count);
|
|
|
|
if (test_and_clear_bit(NETFS_INODE_NEED_FLUSH, &pi->state))
|
|
pohmelfs_flush_inode(pi, count);
|
|
|
|
while (count--)
|
|
iput(&pi->vfs_inode);
|
|
}
|
|
|
|
static void pohmelfs_drop_scan(struct work_struct *work)
|
|
{
|
|
struct pohmelfs_sb *psb =
|
|
container_of(work, struct pohmelfs_sb, drop_dwork.work);
|
|
struct pohmelfs_inode *pi;
|
|
unsigned int count = 0;
|
|
|
|
while ((pi = pohmelfs_get_inode_from_list(psb, &psb->drop_list, &count)))
|
|
pohmelfs_put_inode_count(pi, count);
|
|
|
|
pohmelfs_check_states(psb);
|
|
|
|
if (psb->drop_scan_timeout)
|
|
schedule_delayed_work(&psb->drop_dwork, psb->drop_scan_timeout);
|
|
}
|
|
|
|
/*
|
|
* Run through all transactions starting from the oldest,
|
|
* drop transaction from current state and try to send it
|
|
* to all remote nodes, which are currently installed.
|
|
*/
|
|
static void pohmelfs_trans_scan_state(struct netfs_state *st)
|
|
{
|
|
struct rb_node *rb_node;
|
|
struct netfs_trans_dst *dst;
|
|
struct pohmelfs_sb *psb = st->psb;
|
|
unsigned int timeout = psb->trans_scan_timeout;
|
|
struct netfs_trans *t;
|
|
int err;
|
|
|
|
mutex_lock(&st->trans_lock);
|
|
for (rb_node = rb_first(&st->trans_root); rb_node; ) {
|
|
dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry);
|
|
t = dst->trans;
|
|
|
|
if (timeout && time_after(dst->send_time + timeout, jiffies)
|
|
&& dst->retries == 0)
|
|
break;
|
|
|
|
dprintk("%s: t: %p, gen: %u, st: %p, retries: %u, max: %u.\n",
|
|
__func__, t, t->gen, st, dst->retries, psb->trans_retries);
|
|
netfs_trans_get(t);
|
|
|
|
rb_node = rb_next(rb_node);
|
|
|
|
err = -ETIMEDOUT;
|
|
if (timeout && (++dst->retries < psb->trans_retries))
|
|
err = netfs_trans_resend(t, psb);
|
|
|
|
if (err || (t->flags & NETFS_TRANS_SINGLE_DST)) {
|
|
if (netfs_trans_remove_nolock(dst, st))
|
|
netfs_trans_drop_dst_nostate(dst);
|
|
}
|
|
|
|
t->result = err;
|
|
netfs_trans_put(t);
|
|
}
|
|
mutex_unlock(&st->trans_lock);
|
|
}
|
|
|
|
/*
|
|
* Walk through all installed network states and resend all
|
|
* transactions, which are old enough.
|
|
*/
|
|
static void pohmelfs_trans_scan(struct work_struct *work)
|
|
{
|
|
struct pohmelfs_sb *psb =
|
|
container_of(work, struct pohmelfs_sb, dwork.work);
|
|
struct netfs_state *st;
|
|
struct pohmelfs_config *c;
|
|
|
|
mutex_lock(&psb->state_lock);
|
|
list_for_each_entry(c, &psb->state_list, config_entry) {
|
|
st = &c->state;
|
|
|
|
pohmelfs_trans_scan_state(st);
|
|
}
|
|
mutex_unlock(&psb->state_lock);
|
|
|
|
/*
|
|
* If no timeout specified then system is in the middle of umount process,
|
|
* so no need to reschedule scanning process again.
|
|
*/
|
|
if (psb->trans_scan_timeout)
|
|
schedule_delayed_work(&psb->dwork, psb->trans_scan_timeout);
|
|
}
|
|
|
|
int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon,
|
|
unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start)
|
|
{
|
|
struct inode *inode = &pi->vfs_inode;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
|
|
int err = 0, sz;
|
|
struct netfs_trans *t;
|
|
int path_len, addon_len = 0;
|
|
void *data;
|
|
struct netfs_inode_info *info;
|
|
struct netfs_cmd *cmd;
|
|
|
|
dprintk("%s: ino: %llu, cmd: %u, addon: %p.\n", __func__, pi->ino, cmd_op, addon);
|
|
|
|
path_len = pohmelfs_path_length(pi);
|
|
if (path_len < 0) {
|
|
err = path_len;
|
|
goto err_out_exit;
|
|
}
|
|
|
|
if (addon)
|
|
addon_len = strlen(addon) + 1; /* 0-byte */
|
|
sz = addon_len;
|
|
|
|
if (cmd_op == NETFS_INODE_INFO)
|
|
sz += sizeof(struct netfs_inode_info);
|
|
|
|
t = netfs_trans_alloc(psb, sz + path_len, flags, 0);
|
|
if (!t) {
|
|
err = -ENOMEM;
|
|
goto err_out_exit;
|
|
}
|
|
t->complete = complete;
|
|
t->private = priv;
|
|
|
|
cmd = netfs_trans_current(t);
|
|
data = (void *)(cmd + 1);
|
|
|
|
if (cmd_op == NETFS_INODE_INFO) {
|
|
info = (struct netfs_inode_info *)(cmd + 1);
|
|
data = (void *)(info + 1);
|
|
|
|
/*
|
|
* We are under i_mutex, can read and change whatever we want...
|
|
*/
|
|
info->mode = inode->i_mode;
|
|
info->nlink = inode->i_nlink;
|
|
info->uid = inode->i_uid;
|
|
info->gid = inode->i_gid;
|
|
info->blocks = inode->i_blocks;
|
|
info->rdev = inode->i_rdev;
|
|
info->size = inode->i_size;
|
|
info->version = inode->i_version;
|
|
|
|
netfs_convert_inode_info(info);
|
|
}
|
|
|
|
path_len = pohmelfs_construct_path_string(pi, data, path_len);
|
|
if (path_len < 0)
|
|
goto err_out_free;
|
|
|
|
dprintk("%s: path_len: %d.\n", __func__, path_len);
|
|
|
|
if (addon) {
|
|
path_len--; /* Do not place null-byte before the addon */
|
|
path_len += sprintf(data + path_len, "/%s", addon) + 1; /* 0 - byte */
|
|
}
|
|
|
|
sz += path_len;
|
|
|
|
cmd->cmd = cmd_op;
|
|
cmd->ext = path_len;
|
|
cmd->size = sz;
|
|
cmd->id = id;
|
|
cmd->start = start;
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, sz);
|
|
|
|
/*
|
|
* Note, that it is possible to leak error here: transaction callback will not
|
|
* be invoked for allocation path failure.
|
|
*/
|
|
return netfs_trans_finish(t, psb);
|
|
|
|
err_out_free:
|
|
netfs_trans_free(t);
|
|
err_out_exit:
|
|
if (complete)
|
|
complete(NULL, 0, priv, err);
|
|
return err;
|
|
}
|
|
|
|
int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags,
|
|
netfs_trans_complete_t complete, void *priv, u64 start)
|
|
{
|
|
return pohmelfs_meta_command_data(pi, pi->ino, cmd_op, NULL, flags, complete, priv, start);
|
|
}
|
|
|
|
/*
|
|
* Send request and wait for POHMELFS root capabilities response,
|
|
* which will update server's informaion about size of the export,
|
|
* permissions, number of objects, available size and so on.
|
|
*/
|
|
static int pohmelfs_root_handshake(struct pohmelfs_sb *psb)
|
|
{
|
|
struct netfs_trans *t;
|
|
struct netfs_cmd *cmd;
|
|
int err = -ENOMEM;
|
|
|
|
t = netfs_trans_alloc(psb, 0, 0, 0);
|
|
if (!t)
|
|
goto err_out_exit;
|
|
|
|
cmd = netfs_trans_current(t);
|
|
|
|
cmd->cmd = NETFS_CAPABILITIES;
|
|
cmd->id = POHMELFS_ROOT_CAPABILITIES;
|
|
cmd->size = 0;
|
|
cmd->start = 0;
|
|
cmd->ext = 0;
|
|
cmd->csize = 0;
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, 0);
|
|
|
|
err = netfs_trans_finish(t, psb);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
psb->flags = ~0;
|
|
err = wait_event_interruptible_timeout(psb->wait,
|
|
(psb->flags != ~0),
|
|
psb->wait_on_page_timeout);
|
|
if (!err)
|
|
err = -ETIMEDOUT;
|
|
else if (err > 0)
|
|
err = -psb->flags;
|
|
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
|
|
{
|
|
struct netfs_state *st;
|
|
struct pohmelfs_ctl *ctl;
|
|
struct pohmelfs_sb *psb = POHMELFS_SB(mnt->mnt_sb);
|
|
struct pohmelfs_config *c;
|
|
|
|
mutex_lock(&psb->state_lock);
|
|
|
|
seq_printf(m, "\nidx addr(:port) socket_type protocol active priority permissions\n");
|
|
|
|
list_for_each_entry(c, &psb->state_list, config_entry) {
|
|
st = &c->state;
|
|
ctl = &st->ctl;
|
|
|
|
seq_printf(m, "%u ", ctl->idx);
|
|
if (ctl->addr.sa_family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr;
|
|
seq_printf(m, "%pI4:%u", &sin->sin_addr.s_addr, ntohs(sin->sin_port));
|
|
} else if (ctl->addr.sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr;
|
|
seq_printf(m, "%pi6:%u", &sin->sin6_addr, ntohs(sin->sin6_port));
|
|
} else {
|
|
unsigned int i;
|
|
for (i = 0; i < ctl->addrlen; ++i)
|
|
seq_printf(m, "%02x.", ctl->addr.addr[i]);
|
|
}
|
|
|
|
seq_printf(m, " %u %u %d %u %x\n",
|
|
ctl->type, ctl->proto,
|
|
st->socket != NULL,
|
|
ctl->prio, ctl->perm);
|
|
}
|
|
mutex_unlock(&psb->state_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct super_operations pohmelfs_sb_ops = {
|
|
.alloc_inode = pohmelfs_alloc_inode,
|
|
.destroy_inode = pohmelfs_destroy_inode,
|
|
.drop_inode = pohmelfs_drop_inode,
|
|
.write_inode = pohmelfs_write_inode,
|
|
.put_super = pohmelfs_put_super,
|
|
.remount_fs = pohmelfs_remount,
|
|
.statfs = pohmelfs_statfs,
|
|
.show_options = pohmelfs_show_options,
|
|
.show_stats = pohmelfs_show_stats,
|
|
};
|
|
|
|
/*
|
|
* Allocate private superblock and create root dir.
|
|
*/
|
|
static int pohmelfs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct pohmelfs_sb *psb;
|
|
int err = -ENOMEM;
|
|
struct inode *root;
|
|
struct pohmelfs_inode *npi;
|
|
struct qstr str;
|
|
|
|
psb = kzalloc(sizeof(struct pohmelfs_sb), GFP_KERNEL);
|
|
if (!psb)
|
|
goto err_out_exit;
|
|
|
|
err = bdi_init(&psb->bdi);
|
|
if (err)
|
|
goto err_out_free_sb;
|
|
|
|
err = bdi_register(&psb->bdi, NULL, "pfs-%d", atomic_inc_return(&psb_bdi_num));
|
|
if (err) {
|
|
bdi_destroy(&psb->bdi);
|
|
goto err_out_free_sb;
|
|
}
|
|
|
|
sb->s_fs_info = psb;
|
|
sb->s_op = &pohmelfs_sb_ops;
|
|
sb->s_magic = POHMELFS_MAGIC_NUM;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_bdi = &psb->bdi;
|
|
|
|
psb->sb = sb;
|
|
|
|
psb->ino = 2;
|
|
psb->idx = 0;
|
|
psb->active_state = NULL;
|
|
psb->trans_retries = 5;
|
|
psb->trans_data_size = PAGE_SIZE;
|
|
psb->drop_scan_timeout = msecs_to_jiffies(1000);
|
|
psb->trans_scan_timeout = msecs_to_jiffies(5000);
|
|
psb->wait_on_page_timeout = msecs_to_jiffies(5000);
|
|
init_waitqueue_head(&psb->wait);
|
|
|
|
spin_lock_init(&psb->ino_lock);
|
|
|
|
INIT_LIST_HEAD(&psb->drop_list);
|
|
|
|
mutex_init(&psb->mcache_lock);
|
|
psb->mcache_root = RB_ROOT;
|
|
psb->mcache_timeout = msecs_to_jiffies(5000);
|
|
atomic_long_set(&psb->mcache_gen, 0);
|
|
|
|
psb->trans_max_pages = 100;
|
|
|
|
psb->crypto_align_size = 16;
|
|
psb->crypto_attached_size = 0;
|
|
psb->hash_strlen = 0;
|
|
psb->cipher_strlen = 0;
|
|
psb->perform_crypto = 0;
|
|
psb->crypto_thread_num = 2;
|
|
psb->crypto_fail_unsupported = 0;
|
|
mutex_init(&psb->crypto_thread_lock);
|
|
INIT_LIST_HEAD(&psb->crypto_ready_list);
|
|
INIT_LIST_HEAD(&psb->crypto_active_list);
|
|
|
|
atomic_set(&psb->trans_gen, 1);
|
|
atomic_long_set(&psb->total_inodes, 0);
|
|
|
|
mutex_init(&psb->state_lock);
|
|
INIT_LIST_HEAD(&psb->state_list);
|
|
|
|
err = pohmelfs_parse_options((char *) data, psb, 0);
|
|
if (err)
|
|
goto err_out_free_bdi;
|
|
|
|
err = pohmelfs_copy_crypto(psb);
|
|
if (err)
|
|
goto err_out_free_bdi;
|
|
|
|
err = pohmelfs_state_init(psb);
|
|
if (err)
|
|
goto err_out_free_strings;
|
|
|
|
err = pohmelfs_crypto_init(psb);
|
|
if (err)
|
|
goto err_out_state_exit;
|
|
|
|
err = pohmelfs_root_handshake(psb);
|
|
if (err)
|
|
goto err_out_crypto_exit;
|
|
|
|
str.name = "/";
|
|
str.hash = jhash("/", 1, 0);
|
|
str.len = 1;
|
|
|
|
npi = pohmelfs_create_entry_local(psb, NULL, &str, 0, 0755|S_IFDIR);
|
|
if (IS_ERR(npi)) {
|
|
err = PTR_ERR(npi);
|
|
goto err_out_crypto_exit;
|
|
}
|
|
set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
|
|
clear_bit(NETFS_INODE_OWNED, &npi->state);
|
|
|
|
root = &npi->vfs_inode;
|
|
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root)
|
|
goto err_out_put_root;
|
|
|
|
INIT_DELAYED_WORK(&psb->drop_dwork, pohmelfs_drop_scan);
|
|
schedule_delayed_work(&psb->drop_dwork, psb->drop_scan_timeout);
|
|
|
|
INIT_DELAYED_WORK(&psb->dwork, pohmelfs_trans_scan);
|
|
schedule_delayed_work(&psb->dwork, psb->trans_scan_timeout);
|
|
|
|
return 0;
|
|
|
|
err_out_put_root:
|
|
iput(root);
|
|
err_out_crypto_exit:
|
|
pohmelfs_crypto_exit(psb);
|
|
err_out_state_exit:
|
|
pohmelfs_state_exit(psb);
|
|
err_out_free_strings:
|
|
kfree(psb->cipher_string);
|
|
kfree(psb->hash_string);
|
|
err_out_free_bdi:
|
|
bdi_destroy(&psb->bdi);
|
|
err_out_free_sb:
|
|
kfree(psb);
|
|
err_out_exit:
|
|
|
|
dprintk("%s: err: %d.\n", __func__, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Some VFS magic here...
|
|
*/
|
|
static struct dentry *pohmelfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_nodev(fs_type, flags, data, pohmelfs_fill_super);
|
|
}
|
|
|
|
/*
|
|
* We need this to sync all inodes earlier, since when writeback
|
|
* is invoked from the umount/mntput path dcache is already shrunk,
|
|
* see generic_shutdown_super(), and no inodes can access the path.
|
|
*/
|
|
static void pohmelfs_kill_super(struct super_block *sb)
|
|
{
|
|
sync_inodes_sb(sb);
|
|
kill_anon_super(sb);
|
|
}
|
|
|
|
static struct file_system_type pohmel_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "pohmel",
|
|
.mount = pohmelfs_mount,
|
|
.kill_sb = pohmelfs_kill_super,
|
|
};
|
|
|
|
/*
|
|
* Cache and module initializations and freeing routings.
|
|
*/
|
|
static void pohmelfs_init_once(void *data)
|
|
{
|
|
struct pohmelfs_inode *pi = data;
|
|
|
|
inode_init_once(&pi->vfs_inode);
|
|
}
|
|
|
|
static int __init pohmelfs_init_inodecache(void)
|
|
{
|
|
pohmelfs_inode_cache = kmem_cache_create("pohmelfs_inode_cache",
|
|
sizeof(struct pohmelfs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
|
|
pohmelfs_init_once);
|
|
if (!pohmelfs_inode_cache)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pohmelfs_destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(pohmelfs_inode_cache);
|
|
}
|
|
|
|
static int __init init_pohmel_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = pohmelfs_config_init();
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
err = pohmelfs_init_inodecache();
|
|
if (err)
|
|
goto err_out_config_exit;
|
|
|
|
err = pohmelfs_mcache_init();
|
|
if (err)
|
|
goto err_out_destroy;
|
|
|
|
err = netfs_trans_init();
|
|
if (err)
|
|
goto err_out_mcache_exit;
|
|
|
|
err = register_filesystem(&pohmel_fs_type);
|
|
if (err)
|
|
goto err_out_trans;
|
|
|
|
return 0;
|
|
|
|
err_out_trans:
|
|
netfs_trans_exit();
|
|
err_out_mcache_exit:
|
|
pohmelfs_mcache_exit();
|
|
err_out_destroy:
|
|
pohmelfs_destroy_inodecache();
|
|
err_out_config_exit:
|
|
pohmelfs_config_exit();
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_pohmel_fs(void)
|
|
{
|
|
unregister_filesystem(&pohmel_fs_type);
|
|
pohmelfs_destroy_inodecache();
|
|
pohmelfs_mcache_exit();
|
|
pohmelfs_config_exit();
|
|
netfs_trans_exit();
|
|
}
|
|
|
|
module_init(init_pohmel_fs);
|
|
module_exit(exit_pohmel_fs);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
|
|
MODULE_DESCRIPTION("Pohmel filesystem");
|