2019-07-31 23:57:31 +08:00
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// SPDX-License-Identifier: GPL-2.0-only
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2018-07-26 20:21:47 +08:00
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*/
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#include "internal.h"
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#include <linux/prefetch.h>
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2018-07-26 20:21:55 +08:00
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#include <trace/events/erofs.h>
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2018-07-26 20:21:47 +08:00
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static inline void read_endio(struct bio *bio)
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{
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2019-03-25 11:40:09 +08:00
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struct super_block *const sb = bio->bi_private;
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2018-07-26 20:21:47 +08:00
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struct bio_vec *bvec;
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2019-03-25 11:40:09 +08:00
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blk_status_t err = bio->bi_status;
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2019-02-15 19:13:19 +08:00
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struct bvec_iter_all iter_all;
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2018-07-26 20:21:47 +08:00
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2019-03-25 11:40:09 +08:00
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if (time_to_inject(EROFS_SB(sb), FAULT_READ_IO)) {
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erofs_show_injection_info(FAULT_READ_IO);
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err = BLK_STS_IOERR;
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}
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2019-04-25 15:03:00 +08:00
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bio_for_each_segment_all(bvec, bio, iter_all) {
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2018-07-26 20:21:47 +08:00
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struct page *page = bvec->bv_page;
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/* page is already locked */
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(PageUptodate(page));
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2018-07-26 20:21:47 +08:00
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2019-08-30 00:38:27 +08:00
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if (err)
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2018-07-26 20:21:47 +08:00
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SetPageError(page);
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else
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SetPageUptodate(page);
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unlock_page(page);
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/* page could be reclaimed now */
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}
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bio_put(bio);
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}
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/* prio -- true is used for dir */
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2018-08-21 22:49:30 +08:00
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struct page *__erofs_get_meta_page(struct super_block *sb,
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2018-11-06 03:48:38 +08:00
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erofs_blk_t blkaddr, bool prio, bool nofail)
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2018-07-26 20:21:47 +08:00
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{
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2018-08-21 22:49:30 +08:00
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struct inode *const bd_inode = sb->s_bdev->bd_inode;
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struct address_space *const mapping = bd_inode->i_mapping;
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/* prefer retrying in the allocator to blindly looping below */
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const gfp_t gfp = mapping_gfp_constraint(mapping, ~__GFP_FS) |
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(nofail ? __GFP_NOFAIL : 0);
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unsigned int io_retries = nofail ? EROFS_IO_MAX_RETRIES_NOFAIL : 0;
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2018-07-26 20:21:47 +08:00
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struct page *page;
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2018-08-21 22:49:30 +08:00
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int err;
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2018-07-26 20:21:47 +08:00
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repeat:
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2018-08-21 22:49:30 +08:00
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page = find_or_create_page(mapping, blkaddr, gfp);
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2019-08-30 00:38:27 +08:00
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if (!page) {
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2018-08-21 22:49:30 +08:00
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DBG_BUGON(nofail);
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return ERR_PTR(-ENOMEM);
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}
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DBG_BUGON(!PageLocked(page));
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2018-07-26 20:21:47 +08:00
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if (!PageUptodate(page)) {
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struct bio *bio;
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2019-03-25 11:40:09 +08:00
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bio = erofs_grab_bio(sb, blkaddr, 1, sb, read_endio, nofail);
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2018-08-21 22:49:30 +08:00
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if (IS_ERR(bio)) {
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DBG_BUGON(nofail);
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err = PTR_ERR(bio);
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goto err_out;
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}
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2018-08-21 22:49:29 +08:00
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2019-08-30 01:17:41 +08:00
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if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
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2018-08-21 22:49:30 +08:00
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err = -EFAULT;
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goto err_out;
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}
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2018-07-26 20:21:47 +08:00
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__submit_bio(bio, REQ_OP_READ,
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2018-11-06 03:48:38 +08:00
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REQ_META | (prio ? REQ_PRIO : 0));
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2018-07-26 20:21:47 +08:00
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lock_page(page);
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2018-08-21 22:49:30 +08:00
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/* this page has been truncated by others */
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2019-08-30 00:38:27 +08:00
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if (page->mapping != mapping) {
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2018-08-21 22:49:30 +08:00
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unlock_repeat:
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2018-07-26 20:21:47 +08:00
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unlock_page(page);
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put_page(page);
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goto repeat;
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}
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/* more likely a read error */
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2019-08-30 00:38:27 +08:00
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if (!PageUptodate(page)) {
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2018-08-21 22:49:30 +08:00
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if (io_retries) {
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--io_retries;
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goto unlock_repeat;
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}
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err = -EIO;
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goto err_out;
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2018-07-26 20:21:47 +08:00
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}
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}
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return page;
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2018-08-21 22:49:30 +08:00
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err_out:
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unlock_page(page);
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put_page(page);
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return ERR_PTR(err);
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2018-07-26 20:21:47 +08:00
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}
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static int erofs_map_blocks_flatmode(struct inode *inode,
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2018-11-06 03:48:38 +08:00
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struct erofs_map_blocks *map,
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int flags)
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2018-07-26 20:21:47 +08:00
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{
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2018-09-18 22:27:28 +08:00
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int err = 0;
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2018-07-26 20:21:47 +08:00
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erofs_blk_t nblocks, lastblk;
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u64 offset = map->m_la;
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struct erofs_vnode *vi = EROFS_V(inode);
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2019-09-04 10:08:54 +08:00
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bool tailendpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
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2018-07-26 20:21:47 +08:00
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2018-07-26 20:21:55 +08:00
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trace_erofs_map_blocks_flatmode_enter(inode, map, flags);
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2018-07-26 20:21:47 +08:00
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nblocks = DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
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2019-09-04 10:08:54 +08:00
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lastblk = nblocks - tailendpacking;
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2018-07-26 20:21:47 +08:00
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2019-08-30 00:38:27 +08:00
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if (offset >= inode->i_size) {
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2018-07-26 20:21:47 +08:00
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/* leave out-of-bound access unmapped */
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map->m_flags = 0;
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map->m_plen = 0;
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goto out;
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}
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/* there is no hole in flatmode */
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map->m_flags = EROFS_MAP_MAPPED;
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if (offset < blknr_to_addr(lastblk)) {
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map->m_pa = blknr_to_addr(vi->raw_blkaddr) + map->m_la;
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map->m_plen = blknr_to_addr(lastblk) - offset;
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2019-09-04 10:08:54 +08:00
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} else if (tailendpacking) {
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2018-07-26 20:21:47 +08:00
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/* 2 - inode inline B: inode, [xattrs], inline last blk... */
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struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
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map->m_pa = iloc(sbi, vi->nid) + vi->inode_isize +
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vi->xattr_isize + erofs_blkoff(map->m_la);
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map->m_plen = inode->i_size - offset;
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2019-08-14 18:37:03 +08:00
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/* inline data should be located in one meta block */
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2018-09-18 22:27:28 +08:00
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if (erofs_blkoff(map->m_pa) + map->m_plen > PAGE_SIZE) {
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2019-08-14 18:37:03 +08:00
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errln("inline data cross block boundary @ nid %llu",
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vi->nid);
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(1);
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2019-08-14 18:37:03 +08:00
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err = -EFSCORRUPTED;
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2018-09-18 22:27:28 +08:00
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goto err_out;
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}
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2018-07-26 20:21:47 +08:00
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map->m_flags |= EROFS_MAP_META;
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} else {
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errln("internal error @ nid: %llu (size %llu), m_la 0x%llx",
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2018-11-06 03:48:38 +08:00
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vi->nid, inode->i_size, map->m_la);
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(1);
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err = -EIO;
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goto err_out;
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2018-07-26 20:21:47 +08:00
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}
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out:
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map->m_llen = map->m_plen;
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2018-09-18 22:27:28 +08:00
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err_out:
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2018-07-26 20:21:55 +08:00
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trace_erofs_map_blocks_flatmode_exit(inode, map, flags, 0);
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2018-09-18 22:27:28 +08:00
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return err;
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2018-07-26 20:21:47 +08:00
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}
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int erofs_map_blocks(struct inode *inode,
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2018-11-06 03:48:38 +08:00
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struct erofs_map_blocks *map, int flags)
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2018-07-26 20:21:47 +08:00
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{
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2019-09-04 10:08:54 +08:00
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if (erofs_inode_is_data_compressed(EROFS_V(inode)->datalayout)) {
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2019-01-15 09:42:21 +08:00
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int err = z_erofs_map_blocks_iter(inode, map, flags);
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2018-07-26 20:21:47 +08:00
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2019-01-15 09:42:21 +08:00
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if (map->mpage) {
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put_page(map->mpage);
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map->mpage = NULL;
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}
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2018-07-26 20:21:58 +08:00
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return err;
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}
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2018-07-26 20:21:47 +08:00
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return erofs_map_blocks_flatmode(inode, map, flags);
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}
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2018-11-06 03:48:38 +08:00
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static inline struct bio *erofs_read_raw_page(struct bio *bio,
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struct address_space *mapping,
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struct page *page,
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erofs_off_t *last_block,
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unsigned int nblocks,
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bool ra)
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2018-07-26 20:21:47 +08:00
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{
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2019-03-25 11:40:09 +08:00
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struct inode *const inode = mapping->host;
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struct super_block *const sb = inode->i_sb;
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2018-07-26 20:21:47 +08:00
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erofs_off_t current_block = (erofs_off_t)page->index;
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int err;
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(!nblocks);
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2018-07-26 20:21:47 +08:00
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if (PageUptodate(page)) {
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err = 0;
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goto has_updated;
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}
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/* note that for readpage case, bio also equals to NULL */
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2018-11-06 03:49:05 +08:00
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if (bio &&
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2018-11-06 03:48:38 +08:00
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/* not continuous */
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*last_block + 1 != current_block) {
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2018-07-26 20:21:47 +08:00
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submit_bio_retry:
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__submit_bio(bio, REQ_OP_READ, 0);
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bio = NULL;
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}
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2018-11-06 03:49:05 +08:00
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if (!bio) {
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2018-07-26 20:21:47 +08:00
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struct erofs_map_blocks map = {
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.m_la = blknr_to_addr(current_block),
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};
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2018-07-26 20:22:00 +08:00
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erofs_blk_t blknr;
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2018-09-11 03:41:14 +08:00
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unsigned int blkoff;
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2018-07-26 20:21:47 +08:00
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err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
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2019-08-30 00:38:27 +08:00
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if (err)
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2018-07-26 20:21:47 +08:00
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goto err_out;
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/* zero out the holed page */
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2019-08-30 00:38:27 +08:00
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if (!(map.m_flags & EROFS_MAP_MAPPED)) {
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2018-07-26 20:21:47 +08:00
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zero_user_segment(page, 0, PAGE_SIZE);
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SetPageUptodate(page);
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/* imply err = 0, see erofs_map_blocks */
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goto has_updated;
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}
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/* for RAW access mode, m_plen must be equal to m_llen */
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(map.m_plen != map.m_llen);
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2018-07-26 20:21:47 +08:00
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2018-07-26 20:22:00 +08:00
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blknr = erofs_blknr(map.m_pa);
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blkoff = erofs_blkoff(map.m_pa);
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2018-07-26 20:21:47 +08:00
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/* deal with inline page */
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if (map.m_flags & EROFS_MAP_META) {
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void *vsrc, *vto;
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struct page *ipage;
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(map.m_plen > PAGE_SIZE);
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2018-07-26 20:21:47 +08:00
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2018-07-26 20:22:00 +08:00
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ipage = erofs_get_meta_page(inode->i_sb, blknr, 0);
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2018-07-26 20:21:47 +08:00
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if (IS_ERR(ipage)) {
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err = PTR_ERR(ipage);
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goto err_out;
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}
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vsrc = kmap_atomic(ipage);
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vto = kmap_atomic(page);
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2018-07-26 20:22:00 +08:00
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memcpy(vto, vsrc + blkoff, map.m_plen);
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2018-07-26 20:21:47 +08:00
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memset(vto + map.m_plen, 0, PAGE_SIZE - map.m_plen);
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kunmap_atomic(vto);
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kunmap_atomic(vsrc);
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flush_dcache_page(page);
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SetPageUptodate(page);
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/* TODO: could we unlock the page earlier? */
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unlock_page(ipage);
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put_page(ipage);
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/* imply err = 0, see erofs_map_blocks */
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goto has_updated;
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}
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/* pa must be block-aligned for raw reading */
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2018-09-18 22:27:28 +08:00
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DBG_BUGON(erofs_blkoff(map.m_pa));
|
2018-07-26 20:21:47 +08:00
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/* max # of continuous pages */
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if (nblocks > DIV_ROUND_UP(map.m_plen, PAGE_SIZE))
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nblocks = DIV_ROUND_UP(map.m_plen, PAGE_SIZE);
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if (nblocks > BIO_MAX_PAGES)
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nblocks = BIO_MAX_PAGES;
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|
2019-03-25 11:40:09 +08:00
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bio = erofs_grab_bio(sb, blknr, nblocks, sb,
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read_endio, false);
|
2018-08-21 22:49:29 +08:00
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if (IS_ERR(bio)) {
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err = PTR_ERR(bio);
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bio = NULL;
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goto err_out;
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}
|
2018-07-26 20:21:47 +08:00
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}
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err = bio_add_page(bio, page, PAGE_SIZE, 0);
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/* out of the extent or bio is full */
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if (err < PAGE_SIZE)
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goto submit_bio_retry;
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|
*last_block = current_block;
|
|
|
|
|
|
|
|
/* shift in advance in case of it followed by too many gaps */
|
2019-04-12 17:53:14 +08:00
|
|
|
if (bio->bi_iter.bi_size >= bio->bi_max_vecs * PAGE_SIZE) {
|
2018-07-26 20:21:47 +08:00
|
|
|
/* err should reassign to 0 after submitting */
|
|
|
|
err = 0;
|
|
|
|
goto submit_bio_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
return bio;
|
|
|
|
|
|
|
|
err_out:
|
|
|
|
/* for sync reading, set page error immediately */
|
|
|
|
if (!ra) {
|
|
|
|
SetPageError(page);
|
|
|
|
ClearPageUptodate(page);
|
|
|
|
}
|
|
|
|
has_updated:
|
|
|
|
unlock_page(page);
|
|
|
|
|
|
|
|
/* if updated manually, continuous pages has a gap */
|
2018-11-06 03:49:05 +08:00
|
|
|
if (bio)
|
2018-07-26 20:21:47 +08:00
|
|
|
submit_bio_out:
|
|
|
|
__submit_bio(bio, REQ_OP_READ, 0);
|
|
|
|
|
2019-08-30 00:38:27 +08:00
|
|
|
return err ? ERR_PTR(err) : NULL;
|
2018-07-26 20:21:47 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* since we dont have write or truncate flows, so no inode
|
|
|
|
* locking needs to be held at the moment.
|
|
|
|
*/
|
|
|
|
static int erofs_raw_access_readpage(struct file *file, struct page *page)
|
|
|
|
{
|
|
|
|
erofs_off_t last_block;
|
|
|
|
struct bio *bio;
|
|
|
|
|
2018-07-26 20:21:55 +08:00
|
|
|
trace_erofs_readpage(page, true);
|
|
|
|
|
2018-07-26 20:21:47 +08:00
|
|
|
bio = erofs_read_raw_page(NULL, page->mapping,
|
2018-11-06 03:48:38 +08:00
|
|
|
page, &last_block, 1, false);
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
if (IS_ERR(bio))
|
|
|
|
return PTR_ERR(bio);
|
|
|
|
|
2018-09-18 22:27:28 +08:00
|
|
|
DBG_BUGON(bio); /* since we have only one bio -- must be NULL */
|
2018-07-26 20:21:47 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int erofs_raw_access_readpages(struct file *filp,
|
2018-11-06 03:48:38 +08:00
|
|
|
struct address_space *mapping,
|
|
|
|
struct list_head *pages,
|
|
|
|
unsigned int nr_pages)
|
2018-07-26 20:21:47 +08:00
|
|
|
{
|
|
|
|
erofs_off_t last_block;
|
|
|
|
struct bio *bio = NULL;
|
|
|
|
gfp_t gfp = readahead_gfp_mask(mapping);
|
2018-07-26 20:21:55 +08:00
|
|
|
struct page *page = list_last_entry(pages, struct page, lru);
|
|
|
|
|
|
|
|
trace_erofs_readpages(mapping->host, page, nr_pages, true);
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
for (; nr_pages; --nr_pages) {
|
2018-07-26 20:21:55 +08:00
|
|
|
page = list_entry(pages->prev, struct page, lru);
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
prefetchw(&page->flags);
|
|
|
|
list_del(&page->lru);
|
|
|
|
|
|
|
|
if (!add_to_page_cache_lru(page, mapping, page->index, gfp)) {
|
|
|
|
bio = erofs_read_raw_page(bio, mapping, page,
|
2018-11-06 03:48:38 +08:00
|
|
|
&last_block, nr_pages, true);
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
/* all the page errors are ignored when readahead */
|
|
|
|
if (IS_ERR(bio)) {
|
|
|
|
pr_err("%s, readahead error at page %lu of nid %llu\n",
|
2018-11-06 03:48:38 +08:00
|
|
|
__func__, page->index,
|
|
|
|
EROFS_V(mapping->host)->nid);
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
bio = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* pages could still be locked */
|
|
|
|
put_page(page);
|
|
|
|
}
|
2018-09-18 22:27:28 +08:00
|
|
|
DBG_BUGON(!list_empty(pages));
|
2018-07-26 20:21:47 +08:00
|
|
|
|
|
|
|
/* the rare case (end in gaps) */
|
2019-08-30 00:38:27 +08:00
|
|
|
if (bio)
|
2018-07-26 20:21:47 +08:00
|
|
|
__submit_bio(bio, REQ_OP_READ, 0);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2019-07-16 17:32:56 +08:00
|
|
|
static int erofs_get_block(struct inode *inode, sector_t iblock,
|
|
|
|
struct buffer_head *bh, int create)
|
|
|
|
{
|
|
|
|
struct erofs_map_blocks map = {
|
|
|
|
.m_la = iblock << 9,
|
|
|
|
};
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
if (map.m_flags & EROFS_MAP_MAPPED)
|
|
|
|
bh->b_blocknr = erofs_blknr(map.m_pa);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static sector_t erofs_bmap(struct address_space *mapping, sector_t block)
|
|
|
|
{
|
|
|
|
struct inode *inode = mapping->host;
|
|
|
|
|
2019-09-04 10:08:54 +08:00
|
|
|
if (EROFS_V(inode)->datalayout == EROFS_INODE_FLAT_INLINE) {
|
2019-07-16 17:32:56 +08:00
|
|
|
erofs_blk_t blks = i_size_read(inode) >> LOG_BLOCK_SIZE;
|
|
|
|
|
|
|
|
if (block >> LOG_SECTORS_PER_BLOCK >= blks)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return generic_block_bmap(mapping, block, erofs_get_block);
|
|
|
|
}
|
|
|
|
|
2018-07-26 20:21:47 +08:00
|
|
|
/* for uncompressed (aligned) files and raw access for other files */
|
|
|
|
const struct address_space_operations erofs_raw_access_aops = {
|
|
|
|
.readpage = erofs_raw_access_readpage,
|
|
|
|
.readpages = erofs_raw_access_readpages,
|
2019-07-16 17:32:56 +08:00
|
|
|
.bmap = erofs_bmap,
|
2018-07-26 20:21:47 +08:00
|
|
|
};
|
|
|
|
|