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-rw-r--r--drivers/staging/erofs/data.c400
1 files changed, 0 insertions, 400 deletions
diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c
deleted file mode 100644
index cc31c3e5984c..000000000000
--- a/drivers/staging/erofs/data.c
+++ /dev/null
@@ -1,400 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/drivers/staging/erofs/data.c
- *
- * Copyright (C) 2017-2018 HUAWEI, Inc.
- * http://www.huawei.com/
- * Created by Gao Xiang <gaoxiang25@huawei.com>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of the Linux
- * distribution for more details.
- */
-#include "internal.h"
-#include <linux/prefetch.h>
-
-#include <trace/events/erofs.h>
-
-static inline void read_endio(struct bio *bio)
-{
- struct super_block *const sb = bio->bi_private;
- struct bio_vec *bvec;
- blk_status_t err = bio->bi_status;
- struct bvec_iter_all iter_all;
-
- if (time_to_inject(EROFS_SB(sb), FAULT_READ_IO)) {
- erofs_show_injection_info(FAULT_READ_IO);
- err = BLK_STS_IOERR;
- }
-
- bio_for_each_segment_all(bvec, bio, iter_all) {
- struct page *page = bvec->bv_page;
-
- /* page is already locked */
- DBG_BUGON(PageUptodate(page));
-
- if (unlikely(err))
- SetPageError(page);
- else
- SetPageUptodate(page);
-
- unlock_page(page);
- /* page could be reclaimed now */
- }
- bio_put(bio);
-}
-
-/* prio -- true is used for dir */
-struct page *__erofs_get_meta_page(struct super_block *sb,
- erofs_blk_t blkaddr, bool prio, bool nofail)
-{
- struct inode *const bd_inode = sb->s_bdev->bd_inode;
- struct address_space *const mapping = bd_inode->i_mapping;
- /* prefer retrying in the allocator to blindly looping below */
- const gfp_t gfp = mapping_gfp_constraint(mapping, ~__GFP_FS) |
- (nofail ? __GFP_NOFAIL : 0);
- unsigned int io_retries = nofail ? EROFS_IO_MAX_RETRIES_NOFAIL : 0;
- struct page *page;
- int err;
-
-repeat:
- page = find_or_create_page(mapping, blkaddr, gfp);
- if (unlikely(!page)) {
- DBG_BUGON(nofail);
- return ERR_PTR(-ENOMEM);
- }
- DBG_BUGON(!PageLocked(page));
-
- if (!PageUptodate(page)) {
- struct bio *bio;
-
- bio = erofs_grab_bio(sb, blkaddr, 1, sb, read_endio, nofail);
- if (IS_ERR(bio)) {
- DBG_BUGON(nofail);
- err = PTR_ERR(bio);
- goto err_out;
- }
-
- err = bio_add_page(bio, page, PAGE_SIZE, 0);
- if (unlikely(err != PAGE_SIZE)) {
- err = -EFAULT;
- goto err_out;
- }
-
- __submit_bio(bio, REQ_OP_READ,
- REQ_META | (prio ? REQ_PRIO : 0));
-
- lock_page(page);
-
- /* this page has been truncated by others */
- if (unlikely(page->mapping != mapping)) {
-unlock_repeat:
- unlock_page(page);
- put_page(page);
- goto repeat;
- }
-
- /* more likely a read error */
- if (unlikely(!PageUptodate(page))) {
- if (io_retries) {
- --io_retries;
- goto unlock_repeat;
- }
- err = -EIO;
- goto err_out;
- }
- }
- return page;
-
-err_out:
- unlock_page(page);
- put_page(page);
- return ERR_PTR(err);
-}
-
-static int erofs_map_blocks_flatmode(struct inode *inode,
- struct erofs_map_blocks *map,
- int flags)
-{
- int err = 0;
- erofs_blk_t nblocks, lastblk;
- u64 offset = map->m_la;
- struct erofs_vnode *vi = EROFS_V(inode);
-
- trace_erofs_map_blocks_flatmode_enter(inode, map, flags);
-
- nblocks = DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
- lastblk = nblocks - is_inode_flat_inline(inode);
-
- if (unlikely(offset >= inode->i_size)) {
- /* leave out-of-bound access unmapped */
- map->m_flags = 0;
- map->m_plen = 0;
- goto out;
- }
-
- /* there is no hole in flatmode */
- map->m_flags = EROFS_MAP_MAPPED;
-
- if (offset < blknr_to_addr(lastblk)) {
- map->m_pa = blknr_to_addr(vi->raw_blkaddr) + map->m_la;
- map->m_plen = blknr_to_addr(lastblk) - offset;
- } else if (is_inode_flat_inline(inode)) {
- /* 2 - inode inline B: inode, [xattrs], inline last blk... */
- struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
-
- map->m_pa = iloc(sbi, vi->nid) + vi->inode_isize +
- vi->xattr_isize + erofs_blkoff(map->m_la);
- map->m_plen = inode->i_size - offset;
-
- /* inline data should locate in one meta block */
- if (erofs_blkoff(map->m_pa) + map->m_plen > PAGE_SIZE) {
- DBG_BUGON(1);
- err = -EIO;
- goto err_out;
- }
-
- map->m_flags |= EROFS_MAP_META;
- } else {
- errln("internal error @ nid: %llu (size %llu), m_la 0x%llx",
- vi->nid, inode->i_size, map->m_la);
- DBG_BUGON(1);
- err = -EIO;
- goto err_out;
- }
-
-out:
- map->m_llen = map->m_plen;
-
-err_out:
- trace_erofs_map_blocks_flatmode_exit(inode, map, flags, 0);
- return err;
-}
-
-int erofs_map_blocks(struct inode *inode,
- struct erofs_map_blocks *map, int flags)
-{
- if (unlikely(is_inode_layout_compression(inode))) {
- int err = z_erofs_map_blocks_iter(inode, map, flags);
-
- if (map->mpage) {
- put_page(map->mpage);
- map->mpage = NULL;
- }
- return err;
- }
- return erofs_map_blocks_flatmode(inode, map, flags);
-}
-
-static inline struct bio *erofs_read_raw_page(struct bio *bio,
- struct address_space *mapping,
- struct page *page,
- erofs_off_t *last_block,
- unsigned int nblocks,
- bool ra)
-{
- struct inode *const inode = mapping->host;
- struct super_block *const sb = inode->i_sb;
- erofs_off_t current_block = (erofs_off_t)page->index;
- int err;
-
- DBG_BUGON(!nblocks);
-
- if (PageUptodate(page)) {
- err = 0;
- goto has_updated;
- }
-
- if (cleancache_get_page(page) == 0) {
- err = 0;
- SetPageUptodate(page);
- goto has_updated;
- }
-
- /* note that for readpage case, bio also equals to NULL */
- if (bio &&
- /* not continuous */
- *last_block + 1 != current_block) {
-submit_bio_retry:
- __submit_bio(bio, REQ_OP_READ, 0);
- bio = NULL;
- }
-
- if (!bio) {
- struct erofs_map_blocks map = {
- .m_la = blknr_to_addr(current_block),
- };
- erofs_blk_t blknr;
- unsigned int blkoff;
-
- err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
- if (unlikely(err))
- goto err_out;
-
- /* zero out the holed page */
- if (unlikely(!(map.m_flags & EROFS_MAP_MAPPED))) {
- zero_user_segment(page, 0, PAGE_SIZE);
- SetPageUptodate(page);
-
- /* imply err = 0, see erofs_map_blocks */
- goto has_updated;
- }
-
- /* for RAW access mode, m_plen must be equal to m_llen */
- DBG_BUGON(map.m_plen != map.m_llen);
-
- blknr = erofs_blknr(map.m_pa);
- blkoff = erofs_blkoff(map.m_pa);
-
- /* deal with inline page */
- if (map.m_flags & EROFS_MAP_META) {
- void *vsrc, *vto;
- struct page *ipage;
-
- DBG_BUGON(map.m_plen > PAGE_SIZE);
-
- ipage = erofs_get_meta_page(inode->i_sb, blknr, 0);
-
- if (IS_ERR(ipage)) {
- err = PTR_ERR(ipage);
- goto err_out;
- }
-
- vsrc = kmap_atomic(ipage);
- vto = kmap_atomic(page);
- memcpy(vto, vsrc + blkoff, map.m_plen);
- memset(vto + map.m_plen, 0, PAGE_SIZE - map.m_plen);
- kunmap_atomic(vto);
- kunmap_atomic(vsrc);
- flush_dcache_page(page);
-
- SetPageUptodate(page);
- /* TODO: could we unlock the page earlier? */
- unlock_page(ipage);
- put_page(ipage);
-
- /* imply err = 0, see erofs_map_blocks */
- goto has_updated;
- }
-
- /* pa must be block-aligned for raw reading */
- DBG_BUGON(erofs_blkoff(map.m_pa));
-
- /* max # of continuous pages */
- if (nblocks > DIV_ROUND_UP(map.m_plen, PAGE_SIZE))
- nblocks = DIV_ROUND_UP(map.m_plen, PAGE_SIZE);
- if (nblocks > BIO_MAX_PAGES)
- nblocks = BIO_MAX_PAGES;
-
- bio = erofs_grab_bio(sb, blknr, nblocks, sb,
- read_endio, false);
- if (IS_ERR(bio)) {
- err = PTR_ERR(bio);
- bio = NULL;
- goto err_out;
- }
- }
-
- err = bio_add_page(bio, page, PAGE_SIZE, 0);
- /* out of the extent or bio is full */
- if (err < PAGE_SIZE)
- goto submit_bio_retry;
-
- *last_block = current_block;
-
- /* shift in advance in case of it followed by too many gaps */
- if (bio->bi_iter.bi_size >= bio->bi_max_vecs * PAGE_SIZE) {
- /* 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 */
- if (bio)
-submit_bio_out:
- __submit_bio(bio, REQ_OP_READ, 0);
-
- return unlikely(err) ? ERR_PTR(err) : NULL;
-}
-
-/*
- * 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;
-
- trace_erofs_readpage(page, true);
-
- bio = erofs_read_raw_page(NULL, page->mapping,
- page, &last_block, 1, false);
-
- if (IS_ERR(bio))
- return PTR_ERR(bio);
-
- DBG_BUGON(bio); /* since we have only one bio -- must be NULL */
- return 0;
-}
-
-static int erofs_raw_access_readpages(struct file *filp,
- struct address_space *mapping,
- struct list_head *pages,
- unsigned int nr_pages)
-{
- erofs_off_t last_block;
- struct bio *bio = NULL;
- gfp_t gfp = readahead_gfp_mask(mapping);
- struct page *page = list_last_entry(pages, struct page, lru);
-
- trace_erofs_readpages(mapping->host, page, nr_pages, true);
-
- for (; nr_pages; --nr_pages) {
- page = list_entry(pages->prev, struct page, lru);
-
- 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,
- &last_block, nr_pages, true);
-
- /* all the page errors are ignored when readahead */
- if (IS_ERR(bio)) {
- pr_err("%s, readahead error at page %lu of nid %llu\n",
- __func__, page->index,
- EROFS_V(mapping->host)->nid);
-
- bio = NULL;
- }
- }
-
- /* pages could still be locked */
- put_page(page);
- }
- DBG_BUGON(!list_empty(pages));
-
- /* the rare case (end in gaps) */
- if (unlikely(bio))
- __submit_bio(bio, REQ_OP_READ, 0);
- return 0;
-}
-
-/* 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,
-};
-
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