1897 lines
48 KiB
C
1897 lines
48 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/drivers/staging/erofs/unzip_vle.c
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*
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* Copyright (C) 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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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#include "unzip_vle.h"
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#include <linux/prefetch.h>
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#include <trace/events/erofs.h>
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/*
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* a compressed_pages[] placeholder in order to avoid
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* being filled with file pages for in-place decompression.
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*/
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#define PAGE_UNALLOCATED ((void *)0x5F0E4B1D)
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/* how to allocate cached pages for a workgroup */
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enum z_erofs_cache_alloctype {
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DONTALLOC, /* don't allocate any cached pages */
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DELAYEDALLOC, /* delayed allocation (at the time of submitting io) */
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};
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/*
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* tagged pointer with 1-bit tag for all compressed pages
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* tag 0 - the page is just found with an extra page reference
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*/
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typedef tagptr1_t compressed_page_t;
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#define tag_compressed_page_justfound(page) \
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tagptr_fold(compressed_page_t, page, 1)
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static struct workqueue_struct *z_erofs_workqueue __read_mostly;
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static struct kmem_cache *z_erofs_workgroup_cachep __read_mostly;
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void z_erofs_exit_zip_subsystem(void)
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{
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destroy_workqueue(z_erofs_workqueue);
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kmem_cache_destroy(z_erofs_workgroup_cachep);
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}
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static inline int init_unzip_workqueue(void)
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{
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const unsigned int onlinecpus = num_possible_cpus();
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/*
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* we don't need too many threads, limiting threads
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* could improve scheduling performance.
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*/
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z_erofs_workqueue =
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alloc_workqueue("erofs_unzipd",
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WQ_UNBOUND | WQ_HIGHPRI | WQ_CPU_INTENSIVE,
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onlinecpus + onlinecpus / 4);
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return z_erofs_workqueue ? 0 : -ENOMEM;
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}
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static void init_once(void *ptr)
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{
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struct z_erofs_vle_workgroup *grp = ptr;
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struct z_erofs_vle_work *const work =
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z_erofs_vle_grab_primary_work(grp);
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unsigned int i;
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mutex_init(&work->lock);
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work->nr_pages = 0;
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work->vcnt = 0;
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for (i = 0; i < Z_EROFS_CLUSTER_MAX_PAGES; ++i)
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grp->compressed_pages[i] = NULL;
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}
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static void init_always(struct z_erofs_vle_workgroup *grp)
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{
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struct z_erofs_vle_work *const work =
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z_erofs_vle_grab_primary_work(grp);
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atomic_set(&grp->obj.refcount, 1);
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grp->flags = 0;
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DBG_BUGON(work->nr_pages);
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DBG_BUGON(work->vcnt);
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}
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int __init z_erofs_init_zip_subsystem(void)
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{
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z_erofs_workgroup_cachep =
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kmem_cache_create("erofs_compress",
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Z_EROFS_WORKGROUP_SIZE, 0,
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SLAB_RECLAIM_ACCOUNT, init_once);
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if (z_erofs_workgroup_cachep) {
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if (!init_unzip_workqueue())
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return 0;
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kmem_cache_destroy(z_erofs_workgroup_cachep);
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}
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return -ENOMEM;
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}
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enum z_erofs_vle_work_role {
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Z_EROFS_VLE_WORK_SECONDARY,
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Z_EROFS_VLE_WORK_PRIMARY,
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/*
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* The current work was the tail of an exist chain, and the previous
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* processed chained works are all decided to be hooked up to it.
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* A new chain should be created for the remaining unprocessed works,
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* therefore different from Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED,
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* the next work cannot reuse the whole page in the following scenario:
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* ________________________________________________________________
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* | tail (partial) page | head (partial) page |
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* | (belongs to the next work) | (belongs to the current work) |
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* |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________|
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*/
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Z_EROFS_VLE_WORK_PRIMARY_HOOKED,
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/*
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* The current work has been linked with the processed chained works,
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* and could be also linked with the potential remaining works, which
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* means if the processing page is the tail partial page of the work,
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* the current work can safely use the whole page (since the next work
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* is under control) for in-place decompression, as illustrated below:
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* ________________________________________________________________
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* | tail (partial) page | head (partial) page |
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* | (of the current work) | (of the previous work) |
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* | PRIMARY_FOLLOWED or | |
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* |_____PRIMARY_HOOKED____|____________PRIMARY_FOLLOWED____________|
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*
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* [ (*) the above page can be used for the current work itself. ]
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*/
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Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED,
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Z_EROFS_VLE_WORK_MAX
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};
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struct z_erofs_vle_work_builder {
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enum z_erofs_vle_work_role role;
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/*
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* 'hosted = false' means that the current workgroup doesn't belong to
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* the owned chained workgroups. In the other words, it is none of our
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* business to submit this workgroup.
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*/
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bool hosted;
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struct z_erofs_vle_workgroup *grp;
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struct z_erofs_vle_work *work;
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struct z_erofs_pagevec_ctor vector;
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/* pages used for reading the compressed data */
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struct page **compressed_pages;
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unsigned int compressed_deficit;
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};
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#define VLE_WORK_BUILDER_INIT() \
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{ .work = NULL, .role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED }
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#ifdef EROFS_FS_HAS_MANAGED_CACHE
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static void preload_compressed_pages(struct z_erofs_vle_work_builder *bl,
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struct address_space *mc,
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pgoff_t index,
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unsigned int clusterpages,
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enum z_erofs_cache_alloctype type,
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struct list_head *pagepool,
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gfp_t gfp)
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{
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struct page **const pages = bl->compressed_pages;
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const unsigned int remaining = bl->compressed_deficit;
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bool standalone = true;
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unsigned int i, j = 0;
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if (bl->role < Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED)
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return;
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gfp = mapping_gfp_constraint(mc, gfp) & ~__GFP_RECLAIM;
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index += clusterpages - remaining;
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for (i = 0; i < remaining; ++i) {
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struct page *page;
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compressed_page_t t;
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/* the compressed page was loaded before */
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if (READ_ONCE(pages[i]))
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continue;
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page = find_get_page(mc, index + i);
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if (page) {
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t = tag_compressed_page_justfound(page);
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} else if (type == DELAYEDALLOC) {
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t = tagptr_init(compressed_page_t, PAGE_UNALLOCATED);
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} else { /* DONTALLOC */
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if (standalone)
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j = i;
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standalone = false;
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continue;
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}
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if (!cmpxchg_relaxed(&pages[i], NULL, tagptr_cast_ptr(t)))
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continue;
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if (page)
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put_page(page);
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}
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bl->compressed_pages += j;
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bl->compressed_deficit = remaining - j;
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if (standalone)
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bl->role = Z_EROFS_VLE_WORK_PRIMARY;
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}
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/* called by erofs_shrinker to get rid of all compressed_pages */
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int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
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struct erofs_workgroup *egrp)
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{
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struct z_erofs_vle_workgroup *const grp =
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container_of(egrp, struct z_erofs_vle_workgroup, obj);
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struct address_space *const mapping = MNGD_MAPPING(sbi);
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const int clusterpages = erofs_clusterpages(sbi);
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int i;
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/*
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* refcount of workgroup is now freezed as 1,
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* therefore no need to worry about available decompression users.
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*/
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for (i = 0; i < clusterpages; ++i) {
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struct page *page = grp->compressed_pages[i];
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if (!page || page->mapping != mapping)
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continue;
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/* block other users from reclaiming or migrating the page */
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if (!trylock_page(page))
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return -EBUSY;
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/* barrier is implied in the following 'unlock_page' */
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WRITE_ONCE(grp->compressed_pages[i], NULL);
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set_page_private(page, 0);
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ClearPagePrivate(page);
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unlock_page(page);
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put_page(page);
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}
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return 0;
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}
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int erofs_try_to_free_cached_page(struct address_space *mapping,
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struct page *page)
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{
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struct erofs_sb_info *const sbi = EROFS_SB(mapping->host->i_sb);
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const unsigned int clusterpages = erofs_clusterpages(sbi);
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struct z_erofs_vle_workgroup *const grp = (void *)page_private(page);
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int ret = 0; /* 0 - busy */
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if (erofs_workgroup_try_to_freeze(&grp->obj, 1)) {
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unsigned int i;
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for (i = 0; i < clusterpages; ++i) {
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if (grp->compressed_pages[i] == page) {
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WRITE_ONCE(grp->compressed_pages[i], NULL);
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ret = 1;
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break;
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}
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}
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erofs_workgroup_unfreeze(&grp->obj, 1);
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if (ret) {
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ClearPagePrivate(page);
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put_page(page);
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}
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}
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return ret;
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}
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#else
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static void preload_compressed_pages(struct z_erofs_vle_work_builder *bl,
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struct address_space *mc,
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pgoff_t index,
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unsigned int clusterpages,
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enum z_erofs_cache_alloctype type,
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struct list_head *pagepool,
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gfp_t gfp)
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{
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/* nowhere to load compressed pages from */
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}
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#endif
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/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */
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static inline bool try_to_reuse_as_compressed_page(
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struct z_erofs_vle_work_builder *b,
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struct page *page)
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{
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while (b->compressed_deficit) {
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--b->compressed_deficit;
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if (!cmpxchg(b->compressed_pages++, NULL, page))
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return true;
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}
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return false;
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}
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/* callers must be with work->lock held */
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static int z_erofs_vle_work_add_page(
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struct z_erofs_vle_work_builder *builder,
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struct page *page,
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enum z_erofs_page_type type)
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{
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int ret;
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bool occupied;
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/* give priority for the compressed data storage */
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if (builder->role >= Z_EROFS_VLE_WORK_PRIMARY &&
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type == Z_EROFS_PAGE_TYPE_EXCLUSIVE &&
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try_to_reuse_as_compressed_page(builder, page))
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return 0;
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ret = z_erofs_pagevec_ctor_enqueue(&builder->vector,
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page, type, &occupied);
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builder->work->vcnt += (unsigned int)ret;
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return ret ? 0 : -EAGAIN;
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}
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static enum z_erofs_vle_work_role
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try_to_claim_workgroup(struct z_erofs_vle_workgroup *grp,
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z_erofs_vle_owned_workgrp_t *owned_head,
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bool *hosted)
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{
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DBG_BUGON(*hosted == true);
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/* let's claim these following types of workgroup */
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retry:
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if (grp->next == Z_EROFS_VLE_WORKGRP_NIL) {
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/* type 1, nil workgroup */
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if (cmpxchg(&grp->next, Z_EROFS_VLE_WORKGRP_NIL,
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*owned_head) != Z_EROFS_VLE_WORKGRP_NIL)
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goto retry;
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*owned_head = &grp->next;
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*hosted = true;
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/* lucky, I am the followee :) */
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return Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
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} else if (grp->next == Z_EROFS_VLE_WORKGRP_TAIL) {
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/*
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* type 2, link to the end of a existing open chain,
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* be careful that its submission itself is governed
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* by the original owned chain.
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*/
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if (cmpxchg(&grp->next, Z_EROFS_VLE_WORKGRP_TAIL,
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*owned_head) != Z_EROFS_VLE_WORKGRP_TAIL)
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goto retry;
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*owned_head = Z_EROFS_VLE_WORKGRP_TAIL;
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return Z_EROFS_VLE_WORK_PRIMARY_HOOKED;
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}
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return Z_EROFS_VLE_WORK_PRIMARY; /* :( better luck next time */
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}
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struct z_erofs_vle_work_finder {
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struct super_block *sb;
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pgoff_t idx;
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unsigned int pageofs;
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struct z_erofs_vle_workgroup **grp_ret;
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enum z_erofs_vle_work_role *role;
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z_erofs_vle_owned_workgrp_t *owned_head;
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bool *hosted;
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};
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static struct z_erofs_vle_work *
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z_erofs_vle_work_lookup(const struct z_erofs_vle_work_finder *f)
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{
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bool tag, primary;
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struct erofs_workgroup *egrp;
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struct z_erofs_vle_workgroup *grp;
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struct z_erofs_vle_work *work;
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egrp = erofs_find_workgroup(f->sb, f->idx, &tag);
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if (!egrp) {
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*f->grp_ret = NULL;
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return NULL;
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}
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grp = container_of(egrp, struct z_erofs_vle_workgroup, obj);
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*f->grp_ret = grp;
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work = z_erofs_vle_grab_work(grp, f->pageofs);
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/* if multiref is disabled, `primary' is always true */
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primary = true;
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DBG_BUGON(work->pageofs != f->pageofs);
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/*
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* lock must be taken first to avoid grp->next == NIL between
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* claiming workgroup and adding pages:
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* grp->next != NIL
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* grp->next = NIL
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* mutex_unlock_all
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* mutex_lock(&work->lock)
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* add all pages to pagevec
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*
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* [correct locking case 1]:
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* mutex_lock(grp->work[a])
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* ...
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* mutex_lock(grp->work[b]) mutex_lock(grp->work[c])
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* ... *role = SECONDARY
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* add all pages to pagevec
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* ...
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* mutex_unlock(grp->work[c])
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* mutex_lock(grp->work[c])
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* ...
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* grp->next = NIL
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* mutex_unlock_all
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*
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* [correct locking case 2]:
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* mutex_lock(grp->work[b])
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* ...
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* mutex_lock(grp->work[a])
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* ...
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* mutex_lock(grp->work[c])
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* ...
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* grp->next = NIL
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* mutex_unlock_all
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* mutex_lock(grp->work[a])
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* *role = PRIMARY_OWNER
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* add all pages to pagevec
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* ...
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*/
|
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mutex_lock(&work->lock);
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|
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*f->hosted = false;
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if (!primary)
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*f->role = Z_EROFS_VLE_WORK_SECONDARY;
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else /* claim the workgroup if possible */
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*f->role = try_to_claim_workgroup(grp, f->owned_head,
|
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f->hosted);
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return work;
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}
|
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|
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static struct z_erofs_vle_work *
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z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f,
|
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struct erofs_map_blocks *map)
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{
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bool gnew = false;
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struct z_erofs_vle_workgroup *grp = *f->grp_ret;
|
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struct z_erofs_vle_work *work;
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|
|
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/* if multiref is disabled, grp should never be nullptr */
|
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if (unlikely(grp)) {
|
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DBG_BUGON(1);
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return ERR_PTR(-EINVAL);
|
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}
|
|
|
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/* no available workgroup, let's allocate one */
|
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grp = kmem_cache_alloc(z_erofs_workgroup_cachep, GFP_NOFS);
|
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if (unlikely(!grp))
|
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return ERR_PTR(-ENOMEM);
|
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|
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init_always(grp);
|
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grp->obj.index = f->idx;
|
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grp->llen = map->m_llen;
|
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|
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z_erofs_vle_set_workgrp_fmt(grp,
|
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(map->m_flags & EROFS_MAP_ZIPPED) ?
|
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Z_EROFS_VLE_WORKGRP_FMT_LZ4 :
|
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Z_EROFS_VLE_WORKGRP_FMT_PLAIN);
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|
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/* new workgrps have been claimed as type 1 */
|
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WRITE_ONCE(grp->next, *f->owned_head);
|
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/* primary and followed work for all new workgrps */
|
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*f->role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
|
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/* it should be submitted by ourselves */
|
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*f->hosted = true;
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|
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gnew = true;
|
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work = z_erofs_vle_grab_primary_work(grp);
|
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work->pageofs = f->pageofs;
|
|
|
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/*
|
|
* lock all primary followed works before visible to others
|
|
* and mutex_trylock *never* fails for a new workgroup.
|
|
*/
|
|
mutex_trylock(&work->lock);
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|
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if (gnew) {
|
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int err = erofs_register_workgroup(f->sb, &grp->obj, 0);
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|
|
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if (err) {
|
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mutex_unlock(&work->lock);
|
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kmem_cache_free(z_erofs_workgroup_cachep, grp);
|
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return ERR_PTR(-EAGAIN);
|
|
}
|
|
}
|
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|
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*f->owned_head = &grp->next;
|
|
*f->grp_ret = grp;
|
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return work;
|
|
}
|
|
|
|
#define builder_is_hooked(builder) \
|
|
((builder)->role >= Z_EROFS_VLE_WORK_PRIMARY_HOOKED)
|
|
|
|
#define builder_is_followed(builder) \
|
|
((builder)->role >= Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED)
|
|
|
|
static int z_erofs_vle_work_iter_begin(struct z_erofs_vle_work_builder *builder,
|
|
struct super_block *sb,
|
|
struct erofs_map_blocks *map,
|
|
z_erofs_vle_owned_workgrp_t *owned_head)
|
|
{
|
|
const unsigned int clusterpages = erofs_clusterpages(EROFS_SB(sb));
|
|
struct z_erofs_vle_workgroup *grp;
|
|
const struct z_erofs_vle_work_finder finder = {
|
|
.sb = sb,
|
|
.idx = erofs_blknr(map->m_pa),
|
|
.pageofs = map->m_la & ~PAGE_MASK,
|
|
.grp_ret = &grp,
|
|
.role = &builder->role,
|
|
.owned_head = owned_head,
|
|
.hosted = &builder->hosted
|
|
};
|
|
struct z_erofs_vle_work *work;
|
|
|
|
DBG_BUGON(builder->work);
|
|
|
|
/* must be Z_EROFS_WORK_TAIL or the next chained work */
|
|
DBG_BUGON(*owned_head == Z_EROFS_VLE_WORKGRP_NIL);
|
|
DBG_BUGON(*owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
|
|
DBG_BUGON(erofs_blkoff(map->m_pa));
|
|
|
|
repeat:
|
|
work = z_erofs_vle_work_lookup(&finder);
|
|
if (work) {
|
|
unsigned int orig_llen;
|
|
|
|
/* increase workgroup `llen' if needed */
|
|
while ((orig_llen = READ_ONCE(grp->llen)) < map->m_llen &&
|
|
orig_llen != cmpxchg_relaxed(&grp->llen,
|
|
orig_llen, map->m_llen))
|
|
cpu_relax();
|
|
goto got_it;
|
|
}
|
|
|
|
work = z_erofs_vle_work_register(&finder, map);
|
|
if (unlikely(work == ERR_PTR(-EAGAIN)))
|
|
goto repeat;
|
|
|
|
if (IS_ERR(work))
|
|
return PTR_ERR(work);
|
|
got_it:
|
|
z_erofs_pagevec_ctor_init(&builder->vector,
|
|
Z_EROFS_VLE_INLINE_PAGEVECS, work->pagevec, work->vcnt);
|
|
|
|
if (builder->role >= Z_EROFS_VLE_WORK_PRIMARY) {
|
|
/* enable possibly in-place decompression */
|
|
builder->compressed_pages = grp->compressed_pages;
|
|
builder->compressed_deficit = clusterpages;
|
|
} else {
|
|
builder->compressed_pages = NULL;
|
|
builder->compressed_deficit = 0;
|
|
}
|
|
|
|
builder->grp = grp;
|
|
builder->work = work;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* keep in mind that no referenced workgroups will be freed
|
|
* only after a RCU grace period, so rcu_read_lock() could
|
|
* prevent a workgroup from being freed.
|
|
*/
|
|
static void z_erofs_rcu_callback(struct rcu_head *head)
|
|
{
|
|
struct z_erofs_vle_work *work = container_of(head,
|
|
struct z_erofs_vle_work, rcu);
|
|
struct z_erofs_vle_workgroup *grp =
|
|
z_erofs_vle_work_workgroup(work, true);
|
|
|
|
kmem_cache_free(z_erofs_workgroup_cachep, grp);
|
|
}
|
|
|
|
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp)
|
|
{
|
|
struct z_erofs_vle_workgroup *const vgrp = container_of(grp,
|
|
struct z_erofs_vle_workgroup, obj);
|
|
struct z_erofs_vle_work *const work = &vgrp->work;
|
|
|
|
call_rcu(&work->rcu, z_erofs_rcu_callback);
|
|
}
|
|
|
|
static void __z_erofs_vle_work_release(struct z_erofs_vle_workgroup *grp,
|
|
struct z_erofs_vle_work *work __maybe_unused)
|
|
{
|
|
erofs_workgroup_put(&grp->obj);
|
|
}
|
|
|
|
static void z_erofs_vle_work_release(struct z_erofs_vle_work *work)
|
|
{
|
|
struct z_erofs_vle_workgroup *grp =
|
|
z_erofs_vle_work_workgroup(work, true);
|
|
|
|
__z_erofs_vle_work_release(grp, work);
|
|
}
|
|
|
|
static inline bool
|
|
z_erofs_vle_work_iter_end(struct z_erofs_vle_work_builder *builder)
|
|
{
|
|
struct z_erofs_vle_work *work = builder->work;
|
|
|
|
if (!work)
|
|
return false;
|
|
|
|
z_erofs_pagevec_ctor_exit(&builder->vector, false);
|
|
mutex_unlock(&work->lock);
|
|
|
|
/*
|
|
* if all pending pages are added, don't hold work reference
|
|
* any longer if the current work isn't hosted by ourselves.
|
|
*/
|
|
if (!builder->hosted)
|
|
__z_erofs_vle_work_release(builder->grp, work);
|
|
|
|
builder->work = NULL;
|
|
builder->grp = NULL;
|
|
return true;
|
|
}
|
|
|
|
static inline struct page *__stagingpage_alloc(struct list_head *pagepool,
|
|
gfp_t gfp)
|
|
{
|
|
struct page *page = erofs_allocpage(pagepool, gfp);
|
|
|
|
if (unlikely(!page))
|
|
return NULL;
|
|
|
|
page->mapping = Z_EROFS_MAPPING_STAGING;
|
|
return page;
|
|
}
|
|
|
|
struct z_erofs_vle_frontend {
|
|
struct inode *const inode;
|
|
|
|
struct z_erofs_vle_work_builder builder;
|
|
struct erofs_map_blocks map;
|
|
|
|
z_erofs_vle_owned_workgrp_t owned_head;
|
|
|
|
/* used for applying cache strategy on the fly */
|
|
bool backmost;
|
|
erofs_off_t headoffset;
|
|
};
|
|
|
|
#define VLE_FRONTEND_INIT(__i) { \
|
|
.inode = __i, \
|
|
.map = { \
|
|
.m_llen = 0, \
|
|
.m_plen = 0, \
|
|
.mpage = NULL \
|
|
}, \
|
|
.builder = VLE_WORK_BUILDER_INIT(), \
|
|
.owned_head = Z_EROFS_VLE_WORKGRP_TAIL, \
|
|
.backmost = true, }
|
|
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
static inline bool
|
|
should_alloc_managed_pages(struct z_erofs_vle_frontend *fe, erofs_off_t la)
|
|
{
|
|
if (fe->backmost)
|
|
return true;
|
|
|
|
if (EROFS_FS_ZIP_CACHE_LVL >= 2)
|
|
return la < fe->headoffset;
|
|
|
|
return false;
|
|
}
|
|
#else
|
|
static inline bool
|
|
should_alloc_managed_pages(struct z_erofs_vle_frontend *fe, erofs_off_t la)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
|
|
struct page *page,
|
|
struct list_head *page_pool)
|
|
{
|
|
struct super_block *const sb = fe->inode->i_sb;
|
|
struct erofs_sb_info *const sbi __maybe_unused = EROFS_SB(sb);
|
|
struct erofs_map_blocks *const map = &fe->map;
|
|
struct z_erofs_vle_work_builder *const builder = &fe->builder;
|
|
const loff_t offset = page_offset(page);
|
|
|
|
bool tight = builder_is_hooked(builder);
|
|
struct z_erofs_vle_work *work = builder->work;
|
|
|
|
enum z_erofs_cache_alloctype cache_strategy;
|
|
enum z_erofs_page_type page_type;
|
|
unsigned int cur, end, spiltted, index;
|
|
int err = 0;
|
|
|
|
/* register locked file pages as online pages in pack */
|
|
z_erofs_onlinepage_init(page);
|
|
|
|
spiltted = 0;
|
|
end = PAGE_SIZE;
|
|
repeat:
|
|
cur = end - 1;
|
|
|
|
/* lucky, within the range of the current map_blocks */
|
|
if (offset + cur >= map->m_la &&
|
|
offset + cur < map->m_la + map->m_llen) {
|
|
/* didn't get a valid unzip work previously (very rare) */
|
|
if (!builder->work)
|
|
goto restart_now;
|
|
goto hitted;
|
|
}
|
|
|
|
/* go ahead the next map_blocks */
|
|
debugln("%s: [out-of-range] pos %llu", __func__, offset + cur);
|
|
|
|
if (z_erofs_vle_work_iter_end(builder))
|
|
fe->backmost = false;
|
|
|
|
map->m_la = offset + cur;
|
|
map->m_llen = 0;
|
|
err = z_erofs_map_blocks_iter(fe->inode, map, 0);
|
|
if (unlikely(err))
|
|
goto err_out;
|
|
|
|
restart_now:
|
|
if (unlikely(!(map->m_flags & EROFS_MAP_MAPPED)))
|
|
goto hitted;
|
|
|
|
DBG_BUGON(map->m_plen != 1 << sbi->clusterbits);
|
|
DBG_BUGON(erofs_blkoff(map->m_pa));
|
|
|
|
err = z_erofs_vle_work_iter_begin(builder, sb, map, &fe->owned_head);
|
|
if (unlikely(err))
|
|
goto err_out;
|
|
|
|
/* preload all compressed pages (maybe downgrade role if necessary) */
|
|
if (should_alloc_managed_pages(fe, map->m_la))
|
|
cache_strategy = DELAYEDALLOC;
|
|
else
|
|
cache_strategy = DONTALLOC;
|
|
|
|
preload_compressed_pages(builder, MNGD_MAPPING(sbi),
|
|
map->m_pa / PAGE_SIZE,
|
|
map->m_plen / PAGE_SIZE,
|
|
cache_strategy, page_pool, GFP_KERNEL);
|
|
|
|
tight &= builder_is_hooked(builder);
|
|
work = builder->work;
|
|
hitted:
|
|
cur = end - min_t(unsigned int, offset + end - map->m_la, end);
|
|
if (unlikely(!(map->m_flags & EROFS_MAP_MAPPED))) {
|
|
zero_user_segment(page, cur, end);
|
|
goto next_part;
|
|
}
|
|
|
|
/* let's derive page type */
|
|
page_type = cur ? Z_EROFS_VLE_PAGE_TYPE_HEAD :
|
|
(!spiltted ? Z_EROFS_PAGE_TYPE_EXCLUSIVE :
|
|
(tight ? Z_EROFS_PAGE_TYPE_EXCLUSIVE :
|
|
Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED));
|
|
|
|
if (cur)
|
|
tight &= builder_is_followed(builder);
|
|
|
|
retry:
|
|
err = z_erofs_vle_work_add_page(builder, page, page_type);
|
|
/* should allocate an additional staging page for pagevec */
|
|
if (err == -EAGAIN) {
|
|
struct page *const newpage =
|
|
__stagingpage_alloc(page_pool, GFP_NOFS);
|
|
|
|
err = z_erofs_vle_work_add_page(builder,
|
|
newpage, Z_EROFS_PAGE_TYPE_EXCLUSIVE);
|
|
if (likely(!err))
|
|
goto retry;
|
|
}
|
|
|
|
if (unlikely(err))
|
|
goto err_out;
|
|
|
|
index = page->index - map->m_la / PAGE_SIZE;
|
|
|
|
/* FIXME! avoid the last relundant fixup & endio */
|
|
z_erofs_onlinepage_fixup(page, index, true);
|
|
|
|
/* bump up the number of spiltted parts of a page */
|
|
++spiltted;
|
|
/* also update nr_pages */
|
|
work->nr_pages = max_t(pgoff_t, work->nr_pages, index + 1);
|
|
next_part:
|
|
/* can be used for verification */
|
|
map->m_llen = offset + cur - map->m_la;
|
|
|
|
end = cur;
|
|
if (end > 0)
|
|
goto repeat;
|
|
|
|
out:
|
|
/* FIXME! avoid the last relundant fixup & endio */
|
|
z_erofs_onlinepage_endio(page);
|
|
|
|
debugln("%s, finish page: %pK spiltted: %u map->m_llen %llu",
|
|
__func__, page, spiltted, map->m_llen);
|
|
return err;
|
|
|
|
/* if some error occurred while processing this page */
|
|
err_out:
|
|
SetPageError(page);
|
|
goto out;
|
|
}
|
|
|
|
static void z_erofs_vle_unzip_kickoff(void *ptr, int bios)
|
|
{
|
|
tagptr1_t t = tagptr_init(tagptr1_t, ptr);
|
|
struct z_erofs_vle_unzip_io *io = tagptr_unfold_ptr(t);
|
|
bool background = tagptr_unfold_tags(t);
|
|
|
|
if (!background) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&io->u.wait.lock, flags);
|
|
if (!atomic_add_return(bios, &io->pending_bios))
|
|
wake_up_locked(&io->u.wait);
|
|
spin_unlock_irqrestore(&io->u.wait.lock, flags);
|
|
return;
|
|
}
|
|
|
|
if (!atomic_add_return(bios, &io->pending_bios))
|
|
queue_work(z_erofs_workqueue, &io->u.work);
|
|
}
|
|
|
|
static inline void z_erofs_vle_read_endio(struct bio *bio)
|
|
{
|
|
const blk_status_t err = bio->bi_status;
|
|
struct bio_vec *bvec;
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
struct address_space *mc = NULL;
|
|
#endif
|
|
struct bvec_iter_all iter_all;
|
|
|
|
bio_for_each_segment_all(bvec, bio, iter_all) {
|
|
struct page *page = bvec->bv_page;
|
|
bool cachemngd = false;
|
|
|
|
DBG_BUGON(PageUptodate(page));
|
|
DBG_BUGON(!page->mapping);
|
|
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
if (unlikely(!mc && !z_erofs_is_stagingpage(page))) {
|
|
struct inode *const inode = page->mapping->host;
|
|
struct super_block *const sb = inode->i_sb;
|
|
|
|
mc = MNGD_MAPPING(EROFS_SB(sb));
|
|
}
|
|
|
|
/*
|
|
* If mc has not gotten, it equals NULL,
|
|
* however, page->mapping never be NULL if working properly.
|
|
*/
|
|
cachemngd = (page->mapping == mc);
|
|
#endif
|
|
|
|
if (unlikely(err))
|
|
SetPageError(page);
|
|
else if (cachemngd)
|
|
SetPageUptodate(page);
|
|
|
|
if (cachemngd)
|
|
unlock_page(page);
|
|
}
|
|
|
|
z_erofs_vle_unzip_kickoff(bio->bi_private, -1);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static struct page *z_pagemap_global[Z_EROFS_VLE_VMAP_GLOBAL_PAGES];
|
|
static DEFINE_MUTEX(z_pagemap_global_lock);
|
|
|
|
static int z_erofs_vle_unzip(struct super_block *sb,
|
|
struct z_erofs_vle_workgroup *grp,
|
|
struct list_head *page_pool)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
const unsigned int clusterpages = erofs_clusterpages(sbi);
|
|
|
|
struct z_erofs_pagevec_ctor ctor;
|
|
unsigned int nr_pages;
|
|
unsigned int sparsemem_pages = 0;
|
|
struct page *pages_onstack[Z_EROFS_VLE_VMAP_ONSTACK_PAGES];
|
|
struct page **pages, **compressed_pages, *page;
|
|
unsigned int i, llen;
|
|
|
|
enum z_erofs_page_type page_type;
|
|
bool overlapped;
|
|
struct z_erofs_vle_work *work;
|
|
void *vout;
|
|
int err;
|
|
|
|
might_sleep();
|
|
work = z_erofs_vle_grab_primary_work(grp);
|
|
DBG_BUGON(!READ_ONCE(work->nr_pages));
|
|
|
|
mutex_lock(&work->lock);
|
|
nr_pages = work->nr_pages;
|
|
|
|
if (likely(nr_pages <= Z_EROFS_VLE_VMAP_ONSTACK_PAGES))
|
|
pages = pages_onstack;
|
|
else if (nr_pages <= Z_EROFS_VLE_VMAP_GLOBAL_PAGES &&
|
|
mutex_trylock(&z_pagemap_global_lock))
|
|
pages = z_pagemap_global;
|
|
else {
|
|
repeat:
|
|
pages = kvmalloc_array(nr_pages,
|
|
sizeof(struct page *), GFP_KERNEL);
|
|
|
|
/* fallback to global pagemap for the lowmem scenario */
|
|
if (unlikely(!pages)) {
|
|
if (nr_pages > Z_EROFS_VLE_VMAP_GLOBAL_PAGES)
|
|
goto repeat;
|
|
else {
|
|
mutex_lock(&z_pagemap_global_lock);
|
|
pages = z_pagemap_global;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nr_pages; ++i)
|
|
pages[i] = NULL;
|
|
|
|
z_erofs_pagevec_ctor_init(&ctor,
|
|
Z_EROFS_VLE_INLINE_PAGEVECS, work->pagevec, 0);
|
|
|
|
for (i = 0; i < work->vcnt; ++i) {
|
|
unsigned int pagenr;
|
|
|
|
page = z_erofs_pagevec_ctor_dequeue(&ctor, &page_type);
|
|
|
|
/* all pages in pagevec ought to be valid */
|
|
DBG_BUGON(!page);
|
|
DBG_BUGON(!page->mapping);
|
|
|
|
if (z_erofs_gather_if_stagingpage(page_pool, page))
|
|
continue;
|
|
|
|
if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD)
|
|
pagenr = 0;
|
|
else
|
|
pagenr = z_erofs_onlinepage_index(page);
|
|
|
|
DBG_BUGON(pagenr >= nr_pages);
|
|
DBG_BUGON(pages[pagenr]);
|
|
|
|
pages[pagenr] = page;
|
|
}
|
|
sparsemem_pages = i;
|
|
|
|
z_erofs_pagevec_ctor_exit(&ctor, true);
|
|
|
|
overlapped = false;
|
|
compressed_pages = grp->compressed_pages;
|
|
|
|
err = 0;
|
|
for (i = 0; i < clusterpages; ++i) {
|
|
unsigned int pagenr;
|
|
|
|
page = compressed_pages[i];
|
|
|
|
/* all compressed pages ought to be valid */
|
|
DBG_BUGON(!page);
|
|
DBG_BUGON(!page->mapping);
|
|
|
|
if (!z_erofs_is_stagingpage(page)) {
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
if (page->mapping == MNGD_MAPPING(sbi)) {
|
|
if (unlikely(!PageUptodate(page)))
|
|
err = -EIO;
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* only if non-head page can be selected
|
|
* for inplace decompression
|
|
*/
|
|
pagenr = z_erofs_onlinepage_index(page);
|
|
|
|
DBG_BUGON(pagenr >= nr_pages);
|
|
DBG_BUGON(pages[pagenr]);
|
|
++sparsemem_pages;
|
|
pages[pagenr] = page;
|
|
|
|
overlapped = true;
|
|
}
|
|
|
|
/* PG_error needs checking for inplaced and staging pages */
|
|
if (unlikely(PageError(page))) {
|
|
DBG_BUGON(PageUptodate(page));
|
|
err = -EIO;
|
|
}
|
|
}
|
|
|
|
if (unlikely(err))
|
|
goto out;
|
|
|
|
llen = (nr_pages << PAGE_SHIFT) - work->pageofs;
|
|
|
|
if (z_erofs_vle_workgrp_fmt(grp) == Z_EROFS_VLE_WORKGRP_FMT_PLAIN) {
|
|
err = z_erofs_vle_plain_copy(compressed_pages, clusterpages,
|
|
pages, nr_pages, work->pageofs);
|
|
goto out;
|
|
}
|
|
|
|
if (llen > grp->llen)
|
|
llen = grp->llen;
|
|
|
|
err = z_erofs_vle_unzip_fast_percpu(compressed_pages, clusterpages,
|
|
pages, llen, work->pageofs);
|
|
if (err != -ENOTSUPP)
|
|
goto out;
|
|
|
|
if (sparsemem_pages >= nr_pages)
|
|
goto skip_allocpage;
|
|
|
|
for (i = 0; i < nr_pages; ++i) {
|
|
if (pages[i])
|
|
continue;
|
|
|
|
pages[i] = __stagingpage_alloc(page_pool, GFP_NOFS);
|
|
}
|
|
|
|
skip_allocpage:
|
|
vout = erofs_vmap(pages, nr_pages);
|
|
if (!vout) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = z_erofs_vle_unzip_vmap(compressed_pages,
|
|
clusterpages, vout, llen, work->pageofs, overlapped);
|
|
|
|
erofs_vunmap(vout, nr_pages);
|
|
|
|
out:
|
|
/* must handle all compressed pages before endding pages */
|
|
for (i = 0; i < clusterpages; ++i) {
|
|
page = compressed_pages[i];
|
|
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
if (page->mapping == MNGD_MAPPING(sbi))
|
|
continue;
|
|
#endif
|
|
/* recycle all individual staging pages */
|
|
(void)z_erofs_gather_if_stagingpage(page_pool, page);
|
|
|
|
WRITE_ONCE(compressed_pages[i], NULL);
|
|
}
|
|
|
|
for (i = 0; i < nr_pages; ++i) {
|
|
page = pages[i];
|
|
if (!page)
|
|
continue;
|
|
|
|
DBG_BUGON(!page->mapping);
|
|
|
|
/* recycle all individual staging pages */
|
|
if (z_erofs_gather_if_stagingpage(page_pool, page))
|
|
continue;
|
|
|
|
if (unlikely(err < 0))
|
|
SetPageError(page);
|
|
|
|
z_erofs_onlinepage_endio(page);
|
|
}
|
|
|
|
if (pages == z_pagemap_global)
|
|
mutex_unlock(&z_pagemap_global_lock);
|
|
else if (unlikely(pages != pages_onstack))
|
|
kvfree(pages);
|
|
|
|
work->nr_pages = 0;
|
|
work->vcnt = 0;
|
|
|
|
/* all work locks MUST be taken before the following line */
|
|
|
|
WRITE_ONCE(grp->next, Z_EROFS_VLE_WORKGRP_NIL);
|
|
|
|
/* all work locks SHOULD be released right now */
|
|
mutex_unlock(&work->lock);
|
|
|
|
z_erofs_vle_work_release(work);
|
|
return err;
|
|
}
|
|
|
|
static void z_erofs_vle_unzip_all(struct super_block *sb,
|
|
struct z_erofs_vle_unzip_io *io,
|
|
struct list_head *page_pool)
|
|
{
|
|
z_erofs_vle_owned_workgrp_t owned = io->head;
|
|
|
|
while (owned != Z_EROFS_VLE_WORKGRP_TAIL_CLOSED) {
|
|
struct z_erofs_vle_workgroup *grp;
|
|
|
|
/* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */
|
|
DBG_BUGON(owned == Z_EROFS_VLE_WORKGRP_TAIL);
|
|
|
|
/* no possible that 'owned' equals NULL */
|
|
DBG_BUGON(owned == Z_EROFS_VLE_WORKGRP_NIL);
|
|
|
|
grp = container_of(owned, struct z_erofs_vle_workgroup, next);
|
|
owned = READ_ONCE(grp->next);
|
|
|
|
z_erofs_vle_unzip(sb, grp, page_pool);
|
|
}
|
|
}
|
|
|
|
static void z_erofs_vle_unzip_wq(struct work_struct *work)
|
|
{
|
|
struct z_erofs_vle_unzip_io_sb *iosb = container_of(work,
|
|
struct z_erofs_vle_unzip_io_sb, io.u.work);
|
|
LIST_HEAD(page_pool);
|
|
|
|
DBG_BUGON(iosb->io.head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
z_erofs_vle_unzip_all(iosb->sb, &iosb->io, &page_pool);
|
|
|
|
put_pages_list(&page_pool);
|
|
kvfree(iosb);
|
|
}
|
|
|
|
static struct page *
|
|
pickup_page_for_submission(struct z_erofs_vle_workgroup *grp,
|
|
unsigned int nr,
|
|
struct list_head *pagepool,
|
|
struct address_space *mc,
|
|
gfp_t gfp)
|
|
{
|
|
/* determined at compile time to avoid too many #ifdefs */
|
|
const bool nocache = __builtin_constant_p(mc) ? !mc : false;
|
|
const pgoff_t index = grp->obj.index;
|
|
bool tocache = false;
|
|
|
|
struct address_space *mapping;
|
|
struct page *oldpage, *page;
|
|
|
|
compressed_page_t t;
|
|
int justfound;
|
|
|
|
repeat:
|
|
page = READ_ONCE(grp->compressed_pages[nr]);
|
|
oldpage = page;
|
|
|
|
if (!page)
|
|
goto out_allocpage;
|
|
|
|
/*
|
|
* the cached page has not been allocated and
|
|
* an placeholder is out there, prepare it now.
|
|
*/
|
|
if (!nocache && page == PAGE_UNALLOCATED) {
|
|
tocache = true;
|
|
goto out_allocpage;
|
|
}
|
|
|
|
/* process the target tagged pointer */
|
|
t = tagptr_init(compressed_page_t, page);
|
|
justfound = tagptr_unfold_tags(t);
|
|
page = tagptr_unfold_ptr(t);
|
|
|
|
mapping = READ_ONCE(page->mapping);
|
|
|
|
/*
|
|
* if managed cache is disabled, it's no way to
|
|
* get such a cached-like page.
|
|
*/
|
|
if (nocache) {
|
|
/* if managed cache is disabled, it is impossible `justfound' */
|
|
DBG_BUGON(justfound);
|
|
|
|
/* and it should be locked, not uptodate, and not truncated */
|
|
DBG_BUGON(!PageLocked(page));
|
|
DBG_BUGON(PageUptodate(page));
|
|
DBG_BUGON(!mapping);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* unmanaged (file) pages are all locked solidly,
|
|
* therefore it is impossible for `mapping' to be NULL.
|
|
*/
|
|
if (mapping && mapping != mc)
|
|
/* ought to be unmanaged pages */
|
|
goto out;
|
|
|
|
lock_page(page);
|
|
|
|
/* only true if page reclaim goes wrong, should never happen */
|
|
DBG_BUGON(justfound && PagePrivate(page));
|
|
|
|
/* the page is still in manage cache */
|
|
if (page->mapping == mc) {
|
|
WRITE_ONCE(grp->compressed_pages[nr], page);
|
|
|
|
ClearPageError(page);
|
|
if (!PagePrivate(page)) {
|
|
/*
|
|
* impossible to be !PagePrivate(page) for
|
|
* the current restriction as well if
|
|
* the page is already in compressed_pages[].
|
|
*/
|
|
DBG_BUGON(!justfound);
|
|
|
|
justfound = 0;
|
|
set_page_private(page, (unsigned long)grp);
|
|
SetPagePrivate(page);
|
|
}
|
|
|
|
/* no need to submit io if it is already up-to-date */
|
|
if (PageUptodate(page)) {
|
|
unlock_page(page);
|
|
page = NULL;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* the managed page has been truncated, it's unsafe to
|
|
* reuse this one, let's allocate a new cache-managed page.
|
|
*/
|
|
DBG_BUGON(page->mapping);
|
|
DBG_BUGON(!justfound);
|
|
|
|
tocache = true;
|
|
unlock_page(page);
|
|
put_page(page);
|
|
out_allocpage:
|
|
page = __stagingpage_alloc(pagepool, gfp);
|
|
if (oldpage != cmpxchg(&grp->compressed_pages[nr], oldpage, page)) {
|
|
list_add(&page->lru, pagepool);
|
|
cpu_relax();
|
|
goto repeat;
|
|
}
|
|
if (nocache || !tocache)
|
|
goto out;
|
|
if (add_to_page_cache_lru(page, mc, index + nr, gfp)) {
|
|
page->mapping = Z_EROFS_MAPPING_STAGING;
|
|
goto out;
|
|
}
|
|
|
|
set_page_private(page, (unsigned long)grp);
|
|
SetPagePrivate(page);
|
|
out: /* the only exit (for tracing and debugging) */
|
|
return page;
|
|
}
|
|
|
|
static struct z_erofs_vle_unzip_io *
|
|
jobqueue_init(struct super_block *sb,
|
|
struct z_erofs_vle_unzip_io *io,
|
|
bool foreground)
|
|
{
|
|
struct z_erofs_vle_unzip_io_sb *iosb;
|
|
|
|
if (foreground) {
|
|
/* waitqueue available for foreground io */
|
|
DBG_BUGON(!io);
|
|
|
|
init_waitqueue_head(&io->u.wait);
|
|
atomic_set(&io->pending_bios, 0);
|
|
goto out;
|
|
}
|
|
|
|
iosb = kvzalloc(sizeof(struct z_erofs_vle_unzip_io_sb),
|
|
GFP_KERNEL | __GFP_NOFAIL);
|
|
DBG_BUGON(!iosb);
|
|
|
|
/* initialize fields in the allocated descriptor */
|
|
io = &iosb->io;
|
|
iosb->sb = sb;
|
|
INIT_WORK(&io->u.work, z_erofs_vle_unzip_wq);
|
|
out:
|
|
io->head = Z_EROFS_VLE_WORKGRP_TAIL_CLOSED;
|
|
return io;
|
|
}
|
|
|
|
/* define workgroup jobqueue types */
|
|
enum {
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
JQ_BYPASS,
|
|
#endif
|
|
JQ_SUBMIT,
|
|
NR_JOBQUEUES,
|
|
};
|
|
|
|
static void *jobqueueset_init(struct super_block *sb,
|
|
z_erofs_vle_owned_workgrp_t qtail[],
|
|
struct z_erofs_vle_unzip_io *q[],
|
|
struct z_erofs_vle_unzip_io *fgq,
|
|
bool forcefg)
|
|
{
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
/*
|
|
* if managed cache is enabled, bypass jobqueue is needed,
|
|
* no need to read from device for all workgroups in this queue.
|
|
*/
|
|
q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, true);
|
|
qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
|
|
#endif
|
|
|
|
q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, forcefg);
|
|
qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
|
|
|
|
return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], !forcefg));
|
|
}
|
|
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
static void move_to_bypass_jobqueue(struct z_erofs_vle_workgroup *grp,
|
|
z_erofs_vle_owned_workgrp_t qtail[],
|
|
z_erofs_vle_owned_workgrp_t owned_head)
|
|
{
|
|
z_erofs_vle_owned_workgrp_t *const submit_qtail = qtail[JQ_SUBMIT];
|
|
z_erofs_vle_owned_workgrp_t *const bypass_qtail = qtail[JQ_BYPASS];
|
|
|
|
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
if (owned_head == Z_EROFS_VLE_WORKGRP_TAIL)
|
|
owned_head = Z_EROFS_VLE_WORKGRP_TAIL_CLOSED;
|
|
|
|
WRITE_ONCE(grp->next, Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
|
|
WRITE_ONCE(*submit_qtail, owned_head);
|
|
WRITE_ONCE(*bypass_qtail, &grp->next);
|
|
|
|
qtail[JQ_BYPASS] = &grp->next;
|
|
}
|
|
|
|
static bool postsubmit_is_all_bypassed(struct z_erofs_vle_unzip_io *q[],
|
|
unsigned int nr_bios,
|
|
bool force_fg)
|
|
{
|
|
/*
|
|
* although background is preferred, no one is pending for submission.
|
|
* don't issue workqueue for decompression but drop it directly instead.
|
|
*/
|
|
if (force_fg || nr_bios)
|
|
return false;
|
|
|
|
kvfree(container_of(q[JQ_SUBMIT],
|
|
struct z_erofs_vle_unzip_io_sb,
|
|
io));
|
|
return true;
|
|
}
|
|
#else
|
|
static void move_to_bypass_jobqueue(struct z_erofs_vle_workgroup *grp,
|
|
z_erofs_vle_owned_workgrp_t qtail[],
|
|
z_erofs_vle_owned_workgrp_t owned_head)
|
|
{
|
|
/* impossible to bypass submission for managed cache disabled */
|
|
DBG_BUGON(1);
|
|
}
|
|
|
|
static bool postsubmit_is_all_bypassed(struct z_erofs_vle_unzip_io *q[],
|
|
unsigned int nr_bios,
|
|
bool force_fg)
|
|
{
|
|
/* bios should be >0 if managed cache is disabled */
|
|
DBG_BUGON(!nr_bios);
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static bool z_erofs_vle_submit_all(struct super_block *sb,
|
|
z_erofs_vle_owned_workgrp_t owned_head,
|
|
struct list_head *pagepool,
|
|
struct z_erofs_vle_unzip_io *fgq,
|
|
bool force_fg)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
const unsigned int clusterpages = erofs_clusterpages(sbi);
|
|
const gfp_t gfp = GFP_NOFS;
|
|
|
|
z_erofs_vle_owned_workgrp_t qtail[NR_JOBQUEUES];
|
|
struct z_erofs_vle_unzip_io *q[NR_JOBQUEUES];
|
|
struct bio *bio;
|
|
void *bi_private;
|
|
/* since bio will be NULL, no need to initialize last_index */
|
|
pgoff_t uninitialized_var(last_index);
|
|
bool force_submit = false;
|
|
unsigned int nr_bios;
|
|
|
|
if (unlikely(owned_head == Z_EROFS_VLE_WORKGRP_TAIL))
|
|
return false;
|
|
|
|
force_submit = false;
|
|
bio = NULL;
|
|
nr_bios = 0;
|
|
bi_private = jobqueueset_init(sb, qtail, q, fgq, force_fg);
|
|
|
|
/* by default, all need io submission */
|
|
q[JQ_SUBMIT]->head = owned_head;
|
|
|
|
do {
|
|
struct z_erofs_vle_workgroup *grp;
|
|
pgoff_t first_index;
|
|
struct page *page;
|
|
unsigned int i = 0, bypass = 0;
|
|
int err;
|
|
|
|
/* no possible 'owned_head' equals the following */
|
|
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_NIL);
|
|
|
|
grp = container_of(owned_head,
|
|
struct z_erofs_vle_workgroup, next);
|
|
|
|
/* close the main owned chain at first */
|
|
owned_head = cmpxchg(&grp->next, Z_EROFS_VLE_WORKGRP_TAIL,
|
|
Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
|
|
first_index = grp->obj.index;
|
|
force_submit |= (first_index != last_index + 1);
|
|
|
|
repeat:
|
|
page = pickup_page_for_submission(grp, i, pagepool,
|
|
MNGD_MAPPING(sbi), gfp);
|
|
if (!page) {
|
|
force_submit = true;
|
|
++bypass;
|
|
goto skippage;
|
|
}
|
|
|
|
if (bio && force_submit) {
|
|
submit_bio_retry:
|
|
__submit_bio(bio, REQ_OP_READ, 0);
|
|
bio = NULL;
|
|
}
|
|
|
|
if (!bio) {
|
|
bio = erofs_grab_bio(sb, first_index + i,
|
|
BIO_MAX_PAGES,
|
|
z_erofs_vle_read_endio, true);
|
|
bio->bi_private = bi_private;
|
|
|
|
++nr_bios;
|
|
}
|
|
|
|
err = bio_add_page(bio, page, PAGE_SIZE, 0);
|
|
if (err < PAGE_SIZE)
|
|
goto submit_bio_retry;
|
|
|
|
force_submit = false;
|
|
last_index = first_index + i;
|
|
skippage:
|
|
if (++i < clusterpages)
|
|
goto repeat;
|
|
|
|
if (bypass < clusterpages)
|
|
qtail[JQ_SUBMIT] = &grp->next;
|
|
else
|
|
move_to_bypass_jobqueue(grp, qtail, owned_head);
|
|
} while (owned_head != Z_EROFS_VLE_WORKGRP_TAIL);
|
|
|
|
if (bio)
|
|
__submit_bio(bio, REQ_OP_READ, 0);
|
|
|
|
if (postsubmit_is_all_bypassed(q, nr_bios, force_fg))
|
|
return true;
|
|
|
|
z_erofs_vle_unzip_kickoff(bi_private, nr_bios);
|
|
return true;
|
|
}
|
|
|
|
static void z_erofs_submit_and_unzip(struct z_erofs_vle_frontend *f,
|
|
struct list_head *pagepool,
|
|
bool force_fg)
|
|
{
|
|
struct super_block *sb = f->inode->i_sb;
|
|
struct z_erofs_vle_unzip_io io[NR_JOBQUEUES];
|
|
|
|
if (!z_erofs_vle_submit_all(sb, f->owned_head, pagepool, io, force_fg))
|
|
return;
|
|
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
z_erofs_vle_unzip_all(sb, &io[JQ_BYPASS], pagepool);
|
|
#endif
|
|
if (!force_fg)
|
|
return;
|
|
|
|
/* wait until all bios are completed */
|
|
wait_event(io[JQ_SUBMIT].u.wait,
|
|
!atomic_read(&io[JQ_SUBMIT].pending_bios));
|
|
|
|
/* let's synchronous decompression */
|
|
z_erofs_vle_unzip_all(sb, &io[JQ_SUBMIT], pagepool);
|
|
}
|
|
|
|
static int z_erofs_vle_normalaccess_readpage(struct file *file,
|
|
struct page *page)
|
|
{
|
|
struct inode *const inode = page->mapping->host;
|
|
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
|
|
int err;
|
|
LIST_HEAD(pagepool);
|
|
|
|
trace_erofs_readpage(page, false);
|
|
|
|
f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT;
|
|
|
|
err = z_erofs_do_read_page(&f, page, &pagepool);
|
|
(void)z_erofs_vle_work_iter_end(&f.builder);
|
|
|
|
if (err) {
|
|
errln("%s, failed to read, err [%d]", __func__, err);
|
|
goto out;
|
|
}
|
|
|
|
z_erofs_submit_and_unzip(&f, &pagepool, true);
|
|
out:
|
|
if (f.map.mpage)
|
|
put_page(f.map.mpage);
|
|
|
|
/* clean up the remaining free pages */
|
|
put_pages_list(&pagepool);
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_vle_normalaccess_readpages(struct file *filp,
|
|
struct address_space *mapping,
|
|
struct list_head *pages,
|
|
unsigned int nr_pages)
|
|
{
|
|
struct inode *const inode = mapping->host;
|
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
|
|
bool sync = __should_decompress_synchronously(sbi, nr_pages);
|
|
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
|
|
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
|
|
struct page *head = NULL;
|
|
LIST_HEAD(pagepool);
|
|
|
|
trace_erofs_readpages(mapping->host, lru_to_page(pages),
|
|
nr_pages, false);
|
|
|
|
f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
|
|
|
|
for (; nr_pages; --nr_pages) {
|
|
struct page *page = lru_to_page(pages);
|
|
|
|
prefetchw(&page->flags);
|
|
list_del(&page->lru);
|
|
|
|
/*
|
|
* A pure asynchronous readahead is indicated if
|
|
* a PG_readahead marked page is hitted at first.
|
|
* Let's also do asynchronous decompression for this case.
|
|
*/
|
|
sync &= !(PageReadahead(page) && !head);
|
|
|
|
if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
|
|
list_add(&page->lru, &pagepool);
|
|
continue;
|
|
}
|
|
|
|
set_page_private(page, (unsigned long)head);
|
|
head = page;
|
|
}
|
|
|
|
while (head) {
|
|
struct page *page = head;
|
|
int err;
|
|
|
|
/* traversal in reverse order */
|
|
head = (void *)page_private(page);
|
|
|
|
err = z_erofs_do_read_page(&f, page, &pagepool);
|
|
if (err) {
|
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
|
|
errln("%s, readahead error at page %lu of nid %llu",
|
|
__func__, page->index, vi->nid);
|
|
}
|
|
|
|
put_page(page);
|
|
}
|
|
|
|
(void)z_erofs_vle_work_iter_end(&f.builder);
|
|
|
|
z_erofs_submit_and_unzip(&f, &pagepool, sync);
|
|
|
|
if (f.map.mpage)
|
|
put_page(f.map.mpage);
|
|
|
|
/* clean up the remaining free pages */
|
|
put_pages_list(&pagepool);
|
|
return 0;
|
|
}
|
|
|
|
const struct address_space_operations z_erofs_vle_normalaccess_aops = {
|
|
.readpage = z_erofs_vle_normalaccess_readpage,
|
|
.readpages = z_erofs_vle_normalaccess_readpages,
|
|
};
|
|
|
|
/*
|
|
* Variable-sized Logical Extent (Fixed Physical Cluster) Compression Mode
|
|
* ---
|
|
* VLE compression mode attempts to compress a number of logical data into
|
|
* a physical cluster with a fixed size.
|
|
* VLE compression mode uses "struct z_erofs_vle_decompressed_index".
|
|
*/
|
|
#define __vle_cluster_advise(x, bit, bits) \
|
|
((le16_to_cpu(x) >> (bit)) & ((1 << (bits)) - 1))
|
|
|
|
#define __vle_cluster_type(advise) __vle_cluster_advise(advise, \
|
|
Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT, Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS)
|
|
|
|
#define vle_cluster_type(di) \
|
|
__vle_cluster_type((di)->di_advise)
|
|
|
|
static int
|
|
vle_decompressed_index_clusterofs(unsigned int *clusterofs,
|
|
unsigned int clustersize,
|
|
struct z_erofs_vle_decompressed_index *di)
|
|
{
|
|
switch (vle_cluster_type(di)) {
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
|
*clusterofs = clustersize;
|
|
break;
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
|
*clusterofs = le16_to_cpu(di->di_clusterofs);
|
|
break;
|
|
default:
|
|
DBG_BUGON(1);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline erofs_blk_t
|
|
vle_extent_blkaddr(struct inode *inode, pgoff_t index)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_I_SB(inode);
|
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
|
|
unsigned int ofs = Z_EROFS_VLE_EXTENT_ALIGN(vi->inode_isize +
|
|
vi->xattr_isize) + sizeof(struct erofs_extent_header) +
|
|
index * sizeof(struct z_erofs_vle_decompressed_index);
|
|
|
|
return erofs_blknr(iloc(sbi, vi->nid) + ofs);
|
|
}
|
|
|
|
static inline unsigned int
|
|
vle_extent_blkoff(struct inode *inode, pgoff_t index)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_I_SB(inode);
|
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
|
|
unsigned int ofs = Z_EROFS_VLE_EXTENT_ALIGN(vi->inode_isize +
|
|
vi->xattr_isize) + sizeof(struct erofs_extent_header) +
|
|
index * sizeof(struct z_erofs_vle_decompressed_index);
|
|
|
|
return erofs_blkoff(iloc(sbi, vi->nid) + ofs);
|
|
}
|
|
|
|
struct vle_map_blocks_iter_ctx {
|
|
struct inode *inode;
|
|
struct super_block *sb;
|
|
unsigned int clusterbits;
|
|
|
|
struct page **mpage_ret;
|
|
void **kaddr_ret;
|
|
};
|
|
|
|
static int
|
|
vle_get_logical_extent_head(const struct vle_map_blocks_iter_ctx *ctx,
|
|
unsigned int lcn, /* logical cluster number */
|
|
unsigned long long *ofs,
|
|
erofs_blk_t *pblk,
|
|
unsigned int *flags)
|
|
{
|
|
const unsigned int clustersize = 1 << ctx->clusterbits;
|
|
const erofs_blk_t mblk = vle_extent_blkaddr(ctx->inode, lcn);
|
|
struct page *mpage = *ctx->mpage_ret; /* extent metapage */
|
|
|
|
struct z_erofs_vle_decompressed_index *di;
|
|
unsigned int cluster_type, delta0;
|
|
|
|
if (mpage->index != mblk) {
|
|
kunmap_atomic(*ctx->kaddr_ret);
|
|
unlock_page(mpage);
|
|
put_page(mpage);
|
|
|
|
mpage = erofs_get_meta_page(ctx->sb, mblk, false);
|
|
if (IS_ERR(mpage)) {
|
|
*ctx->mpage_ret = NULL;
|
|
return PTR_ERR(mpage);
|
|
}
|
|
*ctx->mpage_ret = mpage;
|
|
*ctx->kaddr_ret = kmap_atomic(mpage);
|
|
}
|
|
|
|
di = *ctx->kaddr_ret + vle_extent_blkoff(ctx->inode, lcn);
|
|
|
|
cluster_type = vle_cluster_type(di);
|
|
switch (cluster_type) {
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
|
delta0 = le16_to_cpu(di->di_u.delta[0]);
|
|
if (unlikely(!delta0 || delta0 > lcn)) {
|
|
errln("invalid NONHEAD dl0 %u at lcn %u of nid %llu",
|
|
delta0, lcn, EROFS_V(ctx->inode)->nid);
|
|
DBG_BUGON(1);
|
|
return -EIO;
|
|
}
|
|
return vle_get_logical_extent_head(ctx,
|
|
lcn - delta0, ofs, pblk, flags);
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
*flags ^= EROFS_MAP_ZIPPED;
|
|
/* fallthrough */
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
|
/* clustersize should be a power of two */
|
|
*ofs = ((u64)lcn << ctx->clusterbits) +
|
|
(le16_to_cpu(di->di_clusterofs) & (clustersize - 1));
|
|
*pblk = le32_to_cpu(di->di_u.blkaddr);
|
|
break;
|
|
default:
|
|
errln("unknown cluster type %u at lcn %u of nid %llu",
|
|
cluster_type, lcn, EROFS_V(ctx->inode)->nid);
|
|
DBG_BUGON(1);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int z_erofs_map_blocks_iter(struct inode *inode,
|
|
struct erofs_map_blocks *map,
|
|
int flags)
|
|
{
|
|
void *kaddr;
|
|
const struct vle_map_blocks_iter_ctx ctx = {
|
|
.inode = inode,
|
|
.sb = inode->i_sb,
|
|
.clusterbits = EROFS_I_SB(inode)->clusterbits,
|
|
.mpage_ret = &map->mpage,
|
|
.kaddr_ret = &kaddr
|
|
};
|
|
const unsigned int clustersize = 1 << ctx.clusterbits;
|
|
/* if both m_(l,p)len are 0, regularize l_lblk, l_lofs, etc... */
|
|
const bool initial = !map->m_llen;
|
|
|
|
/* logicial extent (start, end) offset */
|
|
unsigned long long ofs, end;
|
|
unsigned int lcn;
|
|
u32 ofs_rem;
|
|
|
|
/* initialize `pblk' to keep gcc from printing foolish warnings */
|
|
erofs_blk_t mblk, pblk = 0;
|
|
struct page *mpage = map->mpage;
|
|
struct z_erofs_vle_decompressed_index *di;
|
|
unsigned int cluster_type, logical_cluster_ofs;
|
|
int err = 0;
|
|
|
|
trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
|
|
|
|
/* when trying to read beyond EOF, leave it unmapped */
|
|
if (unlikely(map->m_la >= inode->i_size)) {
|
|
DBG_BUGON(!initial);
|
|
map->m_llen = map->m_la + 1 - inode->i_size;
|
|
map->m_la = inode->i_size;
|
|
map->m_flags = 0;
|
|
goto out;
|
|
}
|
|
|
|
debugln("%s, m_la %llu m_llen %llu --- start", __func__,
|
|
map->m_la, map->m_llen);
|
|
|
|
ofs = map->m_la + map->m_llen;
|
|
|
|
/* clustersize should be power of two */
|
|
lcn = ofs >> ctx.clusterbits;
|
|
ofs_rem = ofs & (clustersize - 1);
|
|
|
|
mblk = vle_extent_blkaddr(inode, lcn);
|
|
|
|
if (!mpage || mpage->index != mblk) {
|
|
if (mpage)
|
|
put_page(mpage);
|
|
|
|
mpage = erofs_get_meta_page(ctx.sb, mblk, false);
|
|
if (IS_ERR(mpage)) {
|
|
err = PTR_ERR(mpage);
|
|
goto out;
|
|
}
|
|
map->mpage = mpage;
|
|
} else {
|
|
lock_page(mpage);
|
|
DBG_BUGON(!PageUptodate(mpage));
|
|
}
|
|
|
|
kaddr = kmap_atomic(mpage);
|
|
di = kaddr + vle_extent_blkoff(inode, lcn);
|
|
|
|
debugln("%s, lcn %u mblk %u e_blkoff %u", __func__, lcn,
|
|
mblk, vle_extent_blkoff(inode, lcn));
|
|
|
|
err = vle_decompressed_index_clusterofs(&logical_cluster_ofs,
|
|
clustersize, di);
|
|
if (unlikely(err))
|
|
goto unmap_out;
|
|
|
|
if (!initial) {
|
|
/* [walking mode] 'map' has been already initialized */
|
|
map->m_llen += logical_cluster_ofs;
|
|
goto unmap_out;
|
|
}
|
|
|
|
/* by default, compressed */
|
|
map->m_flags |= EROFS_MAP_ZIPPED;
|
|
|
|
end = ((u64)lcn + 1) * clustersize;
|
|
|
|
cluster_type = vle_cluster_type(di);
|
|
|
|
switch (cluster_type) {
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
if (ofs_rem >= logical_cluster_ofs)
|
|
map->m_flags ^= EROFS_MAP_ZIPPED;
|
|
/* fallthrough */
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
|
if (ofs_rem == logical_cluster_ofs) {
|
|
pblk = le32_to_cpu(di->di_u.blkaddr);
|
|
goto exact_hitted;
|
|
}
|
|
|
|
if (ofs_rem > logical_cluster_ofs) {
|
|
ofs = (u64)lcn * clustersize | logical_cluster_ofs;
|
|
pblk = le32_to_cpu(di->di_u.blkaddr);
|
|
break;
|
|
}
|
|
|
|
/* logical cluster number should be >= 1 */
|
|
if (unlikely(!lcn)) {
|
|
errln("invalid logical cluster 0 at nid %llu",
|
|
EROFS_V(inode)->nid);
|
|
err = -EIO;
|
|
goto unmap_out;
|
|
}
|
|
end = ((u64)lcn-- * clustersize) | logical_cluster_ofs;
|
|
/* fallthrough */
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
|
/* get the correspoinding first chunk */
|
|
err = vle_get_logical_extent_head(&ctx, lcn, &ofs,
|
|
&pblk, &map->m_flags);
|
|
mpage = map->mpage;
|
|
|
|
if (unlikely(err)) {
|
|
if (mpage)
|
|
goto unmap_out;
|
|
goto out;
|
|
}
|
|
break;
|
|
default:
|
|
errln("unknown cluster type %u at offset %llu of nid %llu",
|
|
cluster_type, ofs, EROFS_V(inode)->nid);
|
|
err = -EIO;
|
|
goto unmap_out;
|
|
}
|
|
|
|
map->m_la = ofs;
|
|
exact_hitted:
|
|
map->m_llen = end - ofs;
|
|
map->m_plen = clustersize;
|
|
map->m_pa = blknr_to_addr(pblk);
|
|
map->m_flags |= EROFS_MAP_MAPPED;
|
|
unmap_out:
|
|
kunmap_atomic(kaddr);
|
|
unlock_page(mpage);
|
|
out:
|
|
debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
|
|
__func__, map->m_la, map->m_pa,
|
|
map->m_llen, map->m_plen, map->m_flags);
|
|
|
|
trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
|
|
|
|
/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
|
|
DBG_BUGON(err < 0 && err != -ENOMEM);
|
|
return err;
|
|
}
|
|
|