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![Gao Xiang](/assets/img/avatar_default.png)
Both out_bvecs and in_bvecs share the common logic for decompressed buffers. So let's make a helper for this. Acked-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20220715154203.48093-15-hsiangkao@linux.alibaba.com
1615 lines
42 KiB
C
1615 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Copyright (C) 2022 Alibaba Cloud
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*/
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#include "zdata.h"
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#include "compress.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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* since pclustersize is variable for big pcluster feature, introduce slab
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* pools implementation for different pcluster sizes.
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*/
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struct z_erofs_pcluster_slab {
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struct kmem_cache *slab;
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unsigned int maxpages;
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char name[48];
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};
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#define _PCLP(n) { .maxpages = n }
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static struct z_erofs_pcluster_slab pcluster_pool[] __read_mostly = {
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_PCLP(1), _PCLP(4), _PCLP(16), _PCLP(64), _PCLP(128),
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_PCLP(Z_EROFS_PCLUSTER_MAX_PAGES)
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};
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struct z_erofs_bvec_iter {
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struct page *bvpage;
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struct z_erofs_bvset *bvset;
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unsigned int nr, cur;
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};
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static struct page *z_erofs_bvec_iter_end(struct z_erofs_bvec_iter *iter)
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{
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if (iter->bvpage)
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kunmap_local(iter->bvset);
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return iter->bvpage;
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}
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static struct page *z_erofs_bvset_flip(struct z_erofs_bvec_iter *iter)
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{
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unsigned long base = (unsigned long)((struct z_erofs_bvset *)0)->bvec;
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/* have to access nextpage in advance, otherwise it will be unmapped */
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struct page *nextpage = iter->bvset->nextpage;
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struct page *oldpage;
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DBG_BUGON(!nextpage);
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oldpage = z_erofs_bvec_iter_end(iter);
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iter->bvpage = nextpage;
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iter->bvset = kmap_local_page(nextpage);
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iter->nr = (PAGE_SIZE - base) / sizeof(struct z_erofs_bvec);
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iter->cur = 0;
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return oldpage;
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}
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static void z_erofs_bvec_iter_begin(struct z_erofs_bvec_iter *iter,
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struct z_erofs_bvset_inline *bvset,
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unsigned int bootstrap_nr,
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unsigned int cur)
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{
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*iter = (struct z_erofs_bvec_iter) {
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.nr = bootstrap_nr,
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.bvset = (struct z_erofs_bvset *)bvset,
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};
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while (cur > iter->nr) {
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cur -= iter->nr;
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z_erofs_bvset_flip(iter);
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}
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iter->cur = cur;
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}
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static int z_erofs_bvec_enqueue(struct z_erofs_bvec_iter *iter,
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struct z_erofs_bvec *bvec,
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struct page **candidate_bvpage)
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{
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if (iter->cur == iter->nr) {
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if (!*candidate_bvpage)
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return -EAGAIN;
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DBG_BUGON(iter->bvset->nextpage);
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iter->bvset->nextpage = *candidate_bvpage;
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z_erofs_bvset_flip(iter);
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iter->bvset->nextpage = NULL;
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*candidate_bvpage = NULL;
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}
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iter->bvset->bvec[iter->cur++] = *bvec;
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return 0;
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}
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static void z_erofs_bvec_dequeue(struct z_erofs_bvec_iter *iter,
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struct z_erofs_bvec *bvec,
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struct page **old_bvpage)
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{
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if (iter->cur == iter->nr)
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*old_bvpage = z_erofs_bvset_flip(iter);
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else
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*old_bvpage = NULL;
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*bvec = iter->bvset->bvec[iter->cur++];
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}
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static void z_erofs_destroy_pcluster_pool(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) {
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if (!pcluster_pool[i].slab)
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continue;
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kmem_cache_destroy(pcluster_pool[i].slab);
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pcluster_pool[i].slab = NULL;
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}
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}
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static int z_erofs_create_pcluster_pool(void)
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{
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struct z_erofs_pcluster_slab *pcs;
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struct z_erofs_pcluster *a;
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unsigned int size;
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for (pcs = pcluster_pool;
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pcs < pcluster_pool + ARRAY_SIZE(pcluster_pool); ++pcs) {
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size = struct_size(a, compressed_bvecs, pcs->maxpages);
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sprintf(pcs->name, "erofs_pcluster-%u", pcs->maxpages);
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pcs->slab = kmem_cache_create(pcs->name, size, 0,
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SLAB_RECLAIM_ACCOUNT, NULL);
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if (pcs->slab)
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continue;
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z_erofs_destroy_pcluster_pool();
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return -ENOMEM;
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}
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return 0;
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}
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static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) {
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struct z_erofs_pcluster_slab *pcs = pcluster_pool + i;
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struct z_erofs_pcluster *pcl;
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if (nrpages > pcs->maxpages)
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continue;
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pcl = kmem_cache_zalloc(pcs->slab, GFP_NOFS);
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if (!pcl)
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return ERR_PTR(-ENOMEM);
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pcl->pclusterpages = nrpages;
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return pcl;
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}
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return ERR_PTR(-EINVAL);
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}
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static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl)
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{
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unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
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int i;
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for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) {
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struct z_erofs_pcluster_slab *pcs = pcluster_pool + i;
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if (pclusterpages > pcs->maxpages)
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continue;
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kmem_cache_free(pcs->slab, pcl);
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return;
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}
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DBG_BUGON(1);
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}
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/* how to allocate cached pages for a pcluster */
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enum z_erofs_cache_alloctype {
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DONTALLOC, /* don't allocate any cached pages */
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/*
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* try to use cached I/O if page allocation succeeds or fallback
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* to in-place I/O instead to avoid any direct reclaim.
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*/
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TRYALLOC,
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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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void z_erofs_exit_zip_subsystem(void)
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{
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destroy_workqueue(z_erofs_workqueue);
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z_erofs_destroy_pcluster_pool();
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}
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static inline int z_erofs_init_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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* no need to spawn too many threads, limiting threads could minimum
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* scheduling overhead, perhaps per-CPU threads should be better?
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*/
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z_erofs_workqueue = alloc_workqueue("erofs_unzipd",
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WQ_UNBOUND | WQ_HIGHPRI,
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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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int __init z_erofs_init_zip_subsystem(void)
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{
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int err = z_erofs_create_pcluster_pool();
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if (err)
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return err;
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err = z_erofs_init_workqueue();
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if (err)
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z_erofs_destroy_pcluster_pool();
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return err;
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}
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enum z_erofs_pclustermode {
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Z_EROFS_PCLUSTER_INFLIGHT,
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/*
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* The current pclusters was the tail of an exist chain, in addition
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* that the previous processed chained pclusters are all decided to
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* be hooked up to it.
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* A new chain will be created for the remaining pclusters which are
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* not processed yet, so different from Z_EROFS_PCLUSTER_FOLLOWED,
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* the next pcluster cannot reuse the whole page safely for inplace I/O
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* 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 pcl) | (belongs to the current pcl) |
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* |_______PCLUSTER_FOLLOWED______|________PCLUSTER_HOOKED__________|
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*/
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Z_EROFS_PCLUSTER_HOOKED,
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/*
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* a weak form of Z_EROFS_PCLUSTER_FOLLOWED, the difference is that it
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* could be dispatched into bypass queue later due to uptodated managed
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* pages. All related online pages cannot be reused for inplace I/O (or
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* bvpage) since it can be directly decoded without I/O submission.
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*/
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Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE,
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/*
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* The current collection has been linked with the owned chain, and
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* could also be linked with the remaining collections, which means
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* if the processing page is the tail page of the collection, thus
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* the current collection can safely use the whole page (since
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* the previous collection is under control) for in-place I/O, as
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* illustrated below:
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* ________________________________________________________________
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* | tail (partial) page | head (partial) page |
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* | (of the current cl) | (of the previous collection) |
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* | PCLUSTER_FOLLOWED or | |
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* |_____PCLUSTER_HOOKED__|___________PCLUSTER_FOLLOWED____________|
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*
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* [ (*) the above page can be used as inplace I/O. ]
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*/
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Z_EROFS_PCLUSTER_FOLLOWED,
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};
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struct z_erofs_decompress_frontend {
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struct inode *const inode;
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struct erofs_map_blocks map;
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struct z_erofs_bvec_iter biter;
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struct page *candidate_bvpage;
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struct z_erofs_pcluster *pcl, *tailpcl;
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z_erofs_next_pcluster_t owned_head;
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enum z_erofs_pclustermode mode;
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bool readahead;
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/* used for applying cache strategy on the fly */
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bool backmost;
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erofs_off_t headoffset;
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/* a pointer used to pick up inplace I/O pages */
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unsigned int icur;
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};
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#define DECOMPRESS_FRONTEND_INIT(__i) { \
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.inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \
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.mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true }
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static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe,
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enum z_erofs_cache_alloctype type,
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struct page **pagepool)
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{
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struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode));
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struct z_erofs_pcluster *pcl = fe->pcl;
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bool standalone = true;
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/*
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* optimistic allocation without direct reclaim since inplace I/O
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* can be used if low memory otherwise.
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*/
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gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) |
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__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
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unsigned int i;
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if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED)
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return;
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for (i = 0; i < pcl->pclusterpages; ++i) {
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struct page *page;
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compressed_page_t t;
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struct page *newpage = NULL;
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/* the compressed page was loaded before */
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if (READ_ONCE(pcl->compressed_bvecs[i].page))
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continue;
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page = find_get_page(mc, pcl->obj.index + i);
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if (page) {
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t = tag_compressed_page_justfound(page);
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} else {
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/* I/O is needed, no possible to decompress directly */
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standalone = false;
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switch (type) {
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case TRYALLOC:
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newpage = erofs_allocpage(pagepool, gfp);
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if (!newpage)
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continue;
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set_page_private(newpage,
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Z_EROFS_PREALLOCATED_PAGE);
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t = tag_compressed_page_justfound(newpage);
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break;
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default: /* DONTALLOC */
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continue;
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}
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}
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if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL,
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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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else if (newpage)
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erofs_pagepool_add(pagepool, newpage);
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}
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/*
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* don't do inplace I/O if all compressed pages are available in
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* managed cache since it can be moved to the bypass queue instead.
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*/
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if (standalone)
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fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
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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 *grp)
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{
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struct z_erofs_pcluster *const pcl =
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container_of(grp, struct z_erofs_pcluster, obj);
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int i;
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DBG_BUGON(z_erofs_is_inline_pcluster(pcl));
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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 < pcl->pclusterpages; ++i) {
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struct page *page = pcl->compressed_bvecs[i].page;
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if (!page)
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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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if (!erofs_page_is_managed(sbi, page))
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continue;
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/* barrier is implied in the following 'unlock_page' */
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WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);
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detach_page_private(page);
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unlock_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 page *page)
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{
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struct z_erofs_pcluster *const pcl = (void *)page_private(page);
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int ret, i;
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if (!erofs_workgroup_try_to_freeze(&pcl->obj, 1))
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return 0;
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ret = 0;
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DBG_BUGON(z_erofs_is_inline_pcluster(pcl));
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for (i = 0; i < pcl->pclusterpages; ++i) {
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if (pcl->compressed_bvecs[i].page == page) {
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WRITE_ONCE(pcl->compressed_bvecs[i].page, 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(&pcl->obj, 1);
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if (ret)
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detach_page_private(page);
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return ret;
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}
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static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe,
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struct z_erofs_bvec *bvec)
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{
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struct z_erofs_pcluster *const pcl = fe->pcl;
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while (fe->icur > 0) {
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if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page,
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NULL, bvec->page)) {
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pcl->compressed_bvecs[fe->icur] = *bvec;
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return true;
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}
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}
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return false;
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}
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/* callers must be with pcluster lock held */
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static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
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struct z_erofs_bvec *bvec, bool exclusive)
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{
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int ret;
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if (exclusive) {
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/* give priority for inplaceio to use file pages first */
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if (z_erofs_try_inplace_io(fe, bvec))
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return 0;
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/* otherwise, check if it can be used as a bvpage */
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if (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED &&
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!fe->candidate_bvpage)
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fe->candidate_bvpage = bvec->page;
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}
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ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage);
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fe->pcl->vcnt += (ret >= 0);
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return ret;
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}
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static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f)
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{
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struct z_erofs_pcluster *pcl = f->pcl;
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z_erofs_next_pcluster_t *owned_head = &f->owned_head;
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/* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */
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if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL,
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*owned_head) == Z_EROFS_PCLUSTER_NIL) {
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*owned_head = &pcl->next;
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/* so we can attach this pcluster to our submission chain. */
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f->mode = Z_EROFS_PCLUSTER_FOLLOWED;
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return;
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}
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/*
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* type 2, link to the end of an existing open chain, be careful
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* that its submission is controlled by the original attached chain.
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*/
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if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
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*owned_head) == Z_EROFS_PCLUSTER_TAIL) {
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*owned_head = Z_EROFS_PCLUSTER_TAIL;
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f->mode = Z_EROFS_PCLUSTER_HOOKED;
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f->tailpcl = NULL;
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return;
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}
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/* type 3, it belongs to a chain, but it isn't the end of the chain */
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f->mode = Z_EROFS_PCLUSTER_INFLIGHT;
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}
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static int z_erofs_lookup_pcluster(struct z_erofs_decompress_frontend *fe)
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{
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struct erofs_map_blocks *map = &fe->map;
|
|
struct z_erofs_pcluster *pcl = fe->pcl;
|
|
unsigned int length;
|
|
|
|
/* to avoid unexpected loop formed by corrupted images */
|
|
if (fe->owned_head == &pcl->next || pcl == fe->tailpcl) {
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) {
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
length = READ_ONCE(pcl->length);
|
|
if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) {
|
|
if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) {
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
} else {
|
|
unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT;
|
|
|
|
if (map->m_flags & EROFS_MAP_FULL_MAPPED)
|
|
llen |= Z_EROFS_PCLUSTER_FULL_LENGTH;
|
|
|
|
while (llen > length &&
|
|
length != cmpxchg_relaxed(&pcl->length, length, llen)) {
|
|
cpu_relax();
|
|
length = READ_ONCE(pcl->length);
|
|
}
|
|
}
|
|
mutex_lock(&pcl->lock);
|
|
/* used to check tail merging loop due to corrupted images */
|
|
if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
fe->tailpcl = pcl;
|
|
|
|
z_erofs_try_to_claim_pcluster(fe);
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct erofs_map_blocks *map = &fe->map;
|
|
bool ztailpacking = map->m_flags & EROFS_MAP_META;
|
|
struct z_erofs_pcluster *pcl;
|
|
struct erofs_workgroup *grp;
|
|
int err;
|
|
|
|
if (!(map->m_flags & EROFS_MAP_ENCODED)) {
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* no available pcluster, let's allocate one */
|
|
pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 :
|
|
map->m_plen >> PAGE_SHIFT);
|
|
if (IS_ERR(pcl))
|
|
return PTR_ERR(pcl);
|
|
|
|
atomic_set(&pcl->obj.refcount, 1);
|
|
pcl->algorithmformat = map->m_algorithmformat;
|
|
pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) |
|
|
(map->m_flags & EROFS_MAP_FULL_MAPPED ?
|
|
Z_EROFS_PCLUSTER_FULL_LENGTH : 0);
|
|
|
|
/* new pclusters should be claimed as type 1, primary and followed */
|
|
pcl->next = fe->owned_head;
|
|
pcl->pageofs_out = map->m_la & ~PAGE_MASK;
|
|
fe->mode = Z_EROFS_PCLUSTER_FOLLOWED;
|
|
|
|
/*
|
|
* lock all primary followed works before visible to others
|
|
* and mutex_trylock *never* fails for a new pcluster.
|
|
*/
|
|
mutex_init(&pcl->lock);
|
|
DBG_BUGON(!mutex_trylock(&pcl->lock));
|
|
|
|
if (ztailpacking) {
|
|
pcl->obj.index = 0; /* which indicates ztailpacking */
|
|
pcl->pageofs_in = erofs_blkoff(map->m_pa);
|
|
pcl->tailpacking_size = map->m_plen;
|
|
} else {
|
|
pcl->obj.index = map->m_pa >> PAGE_SHIFT;
|
|
|
|
grp = erofs_insert_workgroup(fe->inode->i_sb, &pcl->obj);
|
|
if (IS_ERR(grp)) {
|
|
err = PTR_ERR(grp);
|
|
goto err_out;
|
|
}
|
|
|
|
if (grp != &pcl->obj) {
|
|
fe->pcl = container_of(grp,
|
|
struct z_erofs_pcluster, obj);
|
|
err = -EEXIST;
|
|
goto err_out;
|
|
}
|
|
}
|
|
/* used to check tail merging loop due to corrupted images */
|
|
if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
fe->tailpcl = pcl;
|
|
fe->owned_head = &pcl->next;
|
|
fe->pcl = pcl;
|
|
return 0;
|
|
|
|
err_out:
|
|
mutex_unlock(&pcl->lock);
|
|
z_erofs_free_pcluster(pcl);
|
|
return err;
|
|
}
|
|
|
|
static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct erofs_map_blocks *map = &fe->map;
|
|
struct erofs_workgroup *grp = NULL;
|
|
int ret;
|
|
|
|
DBG_BUGON(fe->pcl);
|
|
|
|
/* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */
|
|
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL);
|
|
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
|
|
if (!(map->m_flags & EROFS_MAP_META)) {
|
|
grp = erofs_find_workgroup(fe->inode->i_sb,
|
|
map->m_pa >> PAGE_SHIFT);
|
|
} else if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) {
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (grp) {
|
|
fe->pcl = container_of(grp, struct z_erofs_pcluster, obj);
|
|
ret = -EEXIST;
|
|
} else {
|
|
ret = z_erofs_register_pcluster(fe);
|
|
}
|
|
|
|
if (ret == -EEXIST) {
|
|
ret = z_erofs_lookup_pcluster(fe);
|
|
if (ret) {
|
|
erofs_workgroup_put(&fe->pcl->obj);
|
|
return ret;
|
|
}
|
|
} else if (ret) {
|
|
return ret;
|
|
}
|
|
z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset,
|
|
Z_EROFS_INLINE_BVECS, fe->pcl->vcnt);
|
|
/* since file-backed online pages are traversed in reverse order */
|
|
fe->icur = z_erofs_pclusterpages(fe->pcl);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* keep in mind that no referenced pclusters will be freed
|
|
* only after a RCU grace period.
|
|
*/
|
|
static void z_erofs_rcu_callback(struct rcu_head *head)
|
|
{
|
|
z_erofs_free_pcluster(container_of(head,
|
|
struct z_erofs_pcluster, rcu));
|
|
}
|
|
|
|
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp)
|
|
{
|
|
struct z_erofs_pcluster *const pcl =
|
|
container_of(grp, struct z_erofs_pcluster, obj);
|
|
|
|
call_rcu(&pcl->rcu, z_erofs_rcu_callback);
|
|
}
|
|
|
|
static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct z_erofs_pcluster *pcl = fe->pcl;
|
|
|
|
if (!pcl)
|
|
return false;
|
|
|
|
z_erofs_bvec_iter_end(&fe->biter);
|
|
mutex_unlock(&pcl->lock);
|
|
|
|
if (fe->candidate_bvpage) {
|
|
DBG_BUGON(z_erofs_is_shortlived_page(fe->candidate_bvpage));
|
|
fe->candidate_bvpage = NULL;
|
|
}
|
|
|
|
/*
|
|
* if all pending pages are added, don't hold its reference
|
|
* any longer if the pcluster isn't hosted by ourselves.
|
|
*/
|
|
if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE)
|
|
erofs_workgroup_put(&pcl->obj);
|
|
|
|
fe->pcl = NULL;
|
|
return true;
|
|
}
|
|
|
|
static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe,
|
|
unsigned int cachestrategy,
|
|
erofs_off_t la)
|
|
{
|
|
if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED)
|
|
return false;
|
|
|
|
if (fe->backmost)
|
|
return true;
|
|
|
|
return cachestrategy >= EROFS_ZIP_CACHE_READAROUND &&
|
|
la < fe->headoffset;
|
|
}
|
|
|
|
static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
|
|
struct page *page, struct page **pagepool)
|
|
{
|
|
struct inode *const inode = fe->inode;
|
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
struct erofs_map_blocks *const map = &fe->map;
|
|
const loff_t offset = page_offset(page);
|
|
bool tight = true, exclusive;
|
|
|
|
enum z_erofs_cache_alloctype cache_strategy;
|
|
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;
|
|
|
|
if (offset + cur < map->m_la ||
|
|
offset + cur >= map->m_la + map->m_llen) {
|
|
erofs_dbg("out-of-range map @ pos %llu", offset + cur);
|
|
|
|
if (z_erofs_collector_end(fe))
|
|
fe->backmost = false;
|
|
map->m_la = offset + cur;
|
|
map->m_llen = 0;
|
|
err = z_erofs_map_blocks_iter(inode, map, 0);
|
|
if (err)
|
|
goto out;
|
|
} else {
|
|
if (fe->pcl)
|
|
goto hitted;
|
|
/* didn't get a valid pcluster previously (very rare) */
|
|
}
|
|
|
|
if (!(map->m_flags & EROFS_MAP_MAPPED))
|
|
goto hitted;
|
|
|
|
err = z_erofs_collector_begin(fe);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (z_erofs_is_inline_pcluster(fe->pcl)) {
|
|
void *mp;
|
|
|
|
mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb,
|
|
erofs_blknr(map->m_pa), EROFS_NO_KMAP);
|
|
if (IS_ERR(mp)) {
|
|
err = PTR_ERR(mp);
|
|
erofs_err(inode->i_sb,
|
|
"failed to get inline page, err %d", err);
|
|
goto out;
|
|
}
|
|
get_page(fe->map.buf.page);
|
|
WRITE_ONCE(fe->pcl->compressed_bvecs[0].page,
|
|
fe->map.buf.page);
|
|
fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
|
|
} else {
|
|
/* bind cache first when cached decompression is preferred */
|
|
if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy,
|
|
map->m_la))
|
|
cache_strategy = TRYALLOC;
|
|
else
|
|
cache_strategy = DONTALLOC;
|
|
|
|
z_erofs_bind_cache(fe, cache_strategy, pagepool);
|
|
}
|
|
hitted:
|
|
/*
|
|
* Ensure the current partial page belongs to this submit chain rather
|
|
* than other concurrent submit chains or the noio(bypass) chain since
|
|
* those chains are handled asynchronously thus the page cannot be used
|
|
* for inplace I/O or bvpage (should be processed in a strict order.)
|
|
*/
|
|
tight &= (fe->mode >= Z_EROFS_PCLUSTER_HOOKED &&
|
|
fe->mode != Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE);
|
|
|
|
cur = end - min_t(unsigned int, offset + end - map->m_la, end);
|
|
if (!(map->m_flags & EROFS_MAP_MAPPED)) {
|
|
zero_user_segment(page, cur, end);
|
|
goto next_part;
|
|
}
|
|
|
|
exclusive = (!cur && (!spiltted || tight));
|
|
if (cur)
|
|
tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED);
|
|
|
|
retry:
|
|
err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) {
|
|
.page = page,
|
|
.offset = offset - map->m_la,
|
|
.end = end,
|
|
}), exclusive);
|
|
/* should allocate an additional short-lived page for bvset */
|
|
if (err == -EAGAIN && !fe->candidate_bvpage) {
|
|
fe->candidate_bvpage = alloc_page(GFP_NOFS | __GFP_NOFAIL);
|
|
set_page_private(fe->candidate_bvpage,
|
|
Z_EROFS_SHORTLIVED_PAGE);
|
|
goto retry;
|
|
}
|
|
|
|
if (err) {
|
|
DBG_BUGON(err == -EAGAIN && fe->candidate_bvpage);
|
|
goto out;
|
|
}
|
|
|
|
z_erofs_onlinepage_split(page);
|
|
/* bump up the number of spiltted parts of a page */
|
|
++spiltted;
|
|
|
|
/* also update nr_pages */
|
|
index = page->index - (map->m_la >> PAGE_SHIFT);
|
|
fe->pcl->nr_pages = max_t(pgoff_t, fe->pcl->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:
|
|
if (err)
|
|
z_erofs_page_mark_eio(page);
|
|
z_erofs_onlinepage_endio(page);
|
|
|
|
erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu",
|
|
__func__, page, spiltted, map->m_llen);
|
|
return err;
|
|
}
|
|
|
|
static bool z_erofs_get_sync_decompress_policy(struct erofs_sb_info *sbi,
|
|
unsigned int readahead_pages)
|
|
{
|
|
/* auto: enable for read_folio, disable for readahead */
|
|
if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) &&
|
|
!readahead_pages)
|
|
return true;
|
|
|
|
if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_FORCE_ON) &&
|
|
(readahead_pages <= sbi->opt.max_sync_decompress_pages))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool z_erofs_page_is_invalidated(struct page *page)
|
|
{
|
|
return !page->mapping && !z_erofs_is_shortlived_page(page);
|
|
}
|
|
|
|
struct z_erofs_decompress_backend {
|
|
struct page *onstack_pages[Z_EROFS_ONSTACK_PAGES];
|
|
struct super_block *sb;
|
|
struct z_erofs_pcluster *pcl;
|
|
|
|
/* pages with the longest decompressed length for deduplication */
|
|
struct page **decompressed_pages;
|
|
/* pages to keep the compressed data */
|
|
struct page **compressed_pages;
|
|
|
|
struct page **pagepool;
|
|
unsigned int onstack_used;
|
|
};
|
|
|
|
static int z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be,
|
|
struct z_erofs_bvec *bvec)
|
|
{
|
|
unsigned int pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT;
|
|
struct page *oldpage;
|
|
|
|
DBG_BUGON(pgnr >= be->pcl->nr_pages);
|
|
oldpage = be->decompressed_pages[pgnr];
|
|
be->decompressed_pages[pgnr] = bvec->page;
|
|
|
|
/* error out if one pcluster is refenenced multiple times. */
|
|
if (oldpage) {
|
|
DBG_BUGON(1);
|
|
z_erofs_page_mark_eio(oldpage);
|
|
z_erofs_onlinepage_endio(oldpage);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_parse_out_bvecs(struct z_erofs_decompress_backend *be)
|
|
{
|
|
struct z_erofs_pcluster *pcl = be->pcl;
|
|
struct z_erofs_bvec_iter biter;
|
|
struct page *old_bvpage;
|
|
int i, err = 0;
|
|
|
|
z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0);
|
|
for (i = 0; i < pcl->vcnt; ++i) {
|
|
struct z_erofs_bvec bvec;
|
|
|
|
z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage);
|
|
|
|
if (old_bvpage)
|
|
z_erofs_put_shortlivedpage(be->pagepool, old_bvpage);
|
|
|
|
DBG_BUGON(z_erofs_page_is_invalidated(bvec.page));
|
|
err = z_erofs_do_decompressed_bvec(be, &bvec);
|
|
}
|
|
|
|
old_bvpage = z_erofs_bvec_iter_end(&biter);
|
|
if (old_bvpage)
|
|
z_erofs_put_shortlivedpage(be->pagepool, old_bvpage);
|
|
return err;
|
|
}
|
|
|
|
static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be,
|
|
bool *overlapped)
|
|
{
|
|
struct z_erofs_pcluster *pcl = be->pcl;
|
|
unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
|
|
int i, err = 0;
|
|
|
|
*overlapped = false;
|
|
for (i = 0; i < pclusterpages; ++i) {
|
|
struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i];
|
|
struct page *page = bvec->page;
|
|
|
|
/* compressed pages ought to be present before decompressing */
|
|
if (!page) {
|
|
DBG_BUGON(1);
|
|
continue;
|
|
}
|
|
be->compressed_pages[i] = page;
|
|
|
|
if (z_erofs_is_inline_pcluster(pcl)) {
|
|
if (!PageUptodate(page))
|
|
err = -EIO;
|
|
continue;
|
|
}
|
|
|
|
DBG_BUGON(z_erofs_page_is_invalidated(page));
|
|
if (!z_erofs_is_shortlived_page(page)) {
|
|
if (erofs_page_is_managed(EROFS_SB(be->sb), page)) {
|
|
if (!PageUptodate(page))
|
|
err = -EIO;
|
|
continue;
|
|
}
|
|
err = z_erofs_do_decompressed_bvec(be, bvec);
|
|
*overlapped = true;
|
|
}
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
|
|
int err)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(be->sb);
|
|
struct z_erofs_pcluster *pcl = be->pcl;
|
|
unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
|
|
unsigned int i, inputsize, outputsize, llen, nr_pages;
|
|
struct page *page;
|
|
int err2;
|
|
bool overlapped, partial;
|
|
|
|
DBG_BUGON(!READ_ONCE(pcl->nr_pages));
|
|
mutex_lock(&pcl->lock);
|
|
nr_pages = pcl->nr_pages;
|
|
|
|
/* allocate (de)compressed page arrays if cannot be kept on stack */
|
|
be->decompressed_pages = NULL;
|
|
be->compressed_pages = NULL;
|
|
be->onstack_used = 0;
|
|
if (nr_pages <= Z_EROFS_ONSTACK_PAGES) {
|
|
be->decompressed_pages = be->onstack_pages;
|
|
be->onstack_used = nr_pages;
|
|
memset(be->decompressed_pages, 0,
|
|
sizeof(struct page *) * nr_pages);
|
|
}
|
|
|
|
if (pclusterpages + be->onstack_used <= Z_EROFS_ONSTACK_PAGES)
|
|
be->compressed_pages = be->onstack_pages + be->onstack_used;
|
|
|
|
if (!be->decompressed_pages)
|
|
be->decompressed_pages =
|
|
kvcalloc(nr_pages, sizeof(struct page *),
|
|
GFP_KERNEL | __GFP_NOFAIL);
|
|
if (!be->compressed_pages)
|
|
be->compressed_pages =
|
|
kvcalloc(pclusterpages, sizeof(struct page *),
|
|
GFP_KERNEL | __GFP_NOFAIL);
|
|
|
|
err2 = z_erofs_parse_out_bvecs(be);
|
|
if (err2)
|
|
err = err2;
|
|
err2 = z_erofs_parse_in_bvecs(be, &overlapped);
|
|
if (err2)
|
|
err = err2;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT;
|
|
if (nr_pages << PAGE_SHIFT >= pcl->pageofs_out + llen) {
|
|
outputsize = llen;
|
|
partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH);
|
|
} else {
|
|
outputsize = (nr_pages << PAGE_SHIFT) - pcl->pageofs_out;
|
|
partial = true;
|
|
}
|
|
|
|
if (z_erofs_is_inline_pcluster(pcl))
|
|
inputsize = pcl->tailpacking_size;
|
|
else
|
|
inputsize = pclusterpages * PAGE_SIZE;
|
|
|
|
err = z_erofs_decompress(&(struct z_erofs_decompress_req) {
|
|
.sb = be->sb,
|
|
.in = be->compressed_pages,
|
|
.out = be->decompressed_pages,
|
|
.pageofs_in = pcl->pageofs_in,
|
|
.pageofs_out = pcl->pageofs_out,
|
|
.inputsize = inputsize,
|
|
.outputsize = outputsize,
|
|
.alg = pcl->algorithmformat,
|
|
.inplace_io = overlapped,
|
|
.partial_decoding = partial
|
|
}, be->pagepool);
|
|
|
|
out:
|
|
/* must handle all compressed pages before actual file pages */
|
|
if (z_erofs_is_inline_pcluster(pcl)) {
|
|
page = pcl->compressed_bvecs[0].page;
|
|
WRITE_ONCE(pcl->compressed_bvecs[0].page, NULL);
|
|
put_page(page);
|
|
} else {
|
|
for (i = 0; i < pclusterpages; ++i) {
|
|
page = pcl->compressed_bvecs[i].page;
|
|
|
|
if (erofs_page_is_managed(sbi, page))
|
|
continue;
|
|
|
|
/* recycle all individual short-lived pages */
|
|
(void)z_erofs_put_shortlivedpage(be->pagepool, page);
|
|
WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);
|
|
}
|
|
}
|
|
if (be->compressed_pages < be->onstack_pages ||
|
|
be->compressed_pages >= be->onstack_pages + Z_EROFS_ONSTACK_PAGES)
|
|
kvfree(be->compressed_pages);
|
|
|
|
for (i = 0; i < nr_pages; ++i) {
|
|
page = be->decompressed_pages[i];
|
|
if (!page)
|
|
continue;
|
|
|
|
DBG_BUGON(z_erofs_page_is_invalidated(page));
|
|
|
|
/* recycle all individual short-lived pages */
|
|
if (z_erofs_put_shortlivedpage(be->pagepool, page))
|
|
continue;
|
|
if (err)
|
|
z_erofs_page_mark_eio(page);
|
|
z_erofs_onlinepage_endio(page);
|
|
}
|
|
|
|
if (be->decompressed_pages != be->onstack_pages)
|
|
kvfree(be->decompressed_pages);
|
|
|
|
pcl->nr_pages = 0;
|
|
pcl->bvset.nextpage = NULL;
|
|
pcl->vcnt = 0;
|
|
|
|
/* pcluster lock MUST be taken before the following line */
|
|
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL);
|
|
mutex_unlock(&pcl->lock);
|
|
return err;
|
|
}
|
|
|
|
static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io,
|
|
struct page **pagepool)
|
|
{
|
|
struct z_erofs_decompress_backend be = {
|
|
.sb = io->sb,
|
|
.pagepool = pagepool,
|
|
};
|
|
z_erofs_next_pcluster_t owned = io->head;
|
|
|
|
while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) {
|
|
/* impossible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */
|
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL);
|
|
/* impossible that 'owned' equals Z_EROFS_PCLUSTER_NIL */
|
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL);
|
|
|
|
be.pcl = container_of(owned, struct z_erofs_pcluster, next);
|
|
owned = READ_ONCE(be.pcl->next);
|
|
|
|
z_erofs_decompress_pcluster(&be, io->eio ? -EIO : 0);
|
|
erofs_workgroup_put(&be.pcl->obj);
|
|
}
|
|
}
|
|
|
|
static void z_erofs_decompressqueue_work(struct work_struct *work)
|
|
{
|
|
struct z_erofs_decompressqueue *bgq =
|
|
container_of(work, struct z_erofs_decompressqueue, u.work);
|
|
struct page *pagepool = NULL;
|
|
|
|
DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
z_erofs_decompress_queue(bgq, &pagepool);
|
|
|
|
erofs_release_pages(&pagepool);
|
|
kvfree(bgq);
|
|
}
|
|
|
|
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
|
|
bool sync, int bios)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(io->sb);
|
|
|
|
/* wake up the caller thread for sync decompression */
|
|
if (sync) {
|
|
if (!atomic_add_return(bios, &io->pending_bios))
|
|
complete(&io->u.done);
|
|
return;
|
|
}
|
|
|
|
if (atomic_add_return(bios, &io->pending_bios))
|
|
return;
|
|
/* Use workqueue and sync decompression for atomic contexts only */
|
|
if (in_atomic() || irqs_disabled()) {
|
|
queue_work(z_erofs_workqueue, &io->u.work);
|
|
/* enable sync decompression for readahead */
|
|
if (sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO)
|
|
sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON;
|
|
return;
|
|
}
|
|
z_erofs_decompressqueue_work(&io->u.work);
|
|
}
|
|
|
|
static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
|
|
unsigned int nr,
|
|
struct page **pagepool,
|
|
struct address_space *mc)
|
|
{
|
|
const pgoff_t index = pcl->obj.index;
|
|
gfp_t gfp = mapping_gfp_mask(mc);
|
|
bool tocache = false;
|
|
|
|
struct address_space *mapping;
|
|
struct page *oldpage, *page;
|
|
|
|
compressed_page_t t;
|
|
int justfound;
|
|
|
|
repeat:
|
|
page = READ_ONCE(pcl->compressed_bvecs[nr].page);
|
|
oldpage = page;
|
|
|
|
if (!page)
|
|
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);
|
|
|
|
/*
|
|
* preallocated cached pages, which is used to avoid direct reclaim
|
|
* otherwise, it will go inplace I/O path instead.
|
|
*/
|
|
if (page->private == Z_EROFS_PREALLOCATED_PAGE) {
|
|
WRITE_ONCE(pcl->compressed_bvecs[nr].page, page);
|
|
set_page_private(page, 0);
|
|
tocache = true;
|
|
goto out_tocache;
|
|
}
|
|
mapping = READ_ONCE(page->mapping);
|
|
|
|
/*
|
|
* file-backed online pages in plcuster are all locked steady,
|
|
* therefore it is impossible for `mapping' to be NULL.
|
|
*/
|
|
if (mapping && mapping != mc)
|
|
/* ought to be unmanaged pages */
|
|
goto out;
|
|
|
|
/* directly return for shortlived page as well */
|
|
if (z_erofs_is_shortlived_page(page))
|
|
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(pcl->compressed_bvecs[nr].page, page);
|
|
|
|
if (!PagePrivate(page)) {
|
|
/*
|
|
* impossible to be !PagePrivate(page) for
|
|
* the current restriction as well if
|
|
* the page is already in compressed_bvecs[].
|
|
*/
|
|
DBG_BUGON(!justfound);
|
|
|
|
justfound = 0;
|
|
set_page_private(page, (unsigned long)pcl);
|
|
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 = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL);
|
|
if (oldpage != cmpxchg(&pcl->compressed_bvecs[nr].page,
|
|
oldpage, page)) {
|
|
erofs_pagepool_add(pagepool, page);
|
|
cond_resched();
|
|
goto repeat;
|
|
}
|
|
out_tocache:
|
|
if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) {
|
|
/* turn into temporary page if fails (1 ref) */
|
|
set_page_private(page, Z_EROFS_SHORTLIVED_PAGE);
|
|
goto out;
|
|
}
|
|
attach_page_private(page, pcl);
|
|
/* drop a refcount added by allocpage (then we have 2 refs here) */
|
|
put_page(page);
|
|
|
|
out: /* the only exit (for tracing and debugging) */
|
|
return page;
|
|
}
|
|
|
|
static struct z_erofs_decompressqueue *
|
|
jobqueue_init(struct super_block *sb,
|
|
struct z_erofs_decompressqueue *fgq, bool *fg)
|
|
{
|
|
struct z_erofs_decompressqueue *q;
|
|
|
|
if (fg && !*fg) {
|
|
q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN);
|
|
if (!q) {
|
|
*fg = true;
|
|
goto fg_out;
|
|
}
|
|
INIT_WORK(&q->u.work, z_erofs_decompressqueue_work);
|
|
} else {
|
|
fg_out:
|
|
q = fgq;
|
|
init_completion(&fgq->u.done);
|
|
atomic_set(&fgq->pending_bios, 0);
|
|
q->eio = false;
|
|
}
|
|
q->sb = sb;
|
|
q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED;
|
|
return q;
|
|
}
|
|
|
|
/* define decompression jobqueue types */
|
|
enum {
|
|
JQ_BYPASS,
|
|
JQ_SUBMIT,
|
|
NR_JOBQUEUES,
|
|
};
|
|
|
|
static void *jobqueueset_init(struct super_block *sb,
|
|
struct z_erofs_decompressqueue *q[],
|
|
struct z_erofs_decompressqueue *fgq, bool *fg)
|
|
{
|
|
/*
|
|
* if managed cache is enabled, bypass jobqueue is needed,
|
|
* no need to read from device for all pclusters in this queue.
|
|
*/
|
|
q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL);
|
|
q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg);
|
|
|
|
return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg));
|
|
}
|
|
|
|
static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl,
|
|
z_erofs_next_pcluster_t qtail[],
|
|
z_erofs_next_pcluster_t owned_head)
|
|
{
|
|
z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT];
|
|
z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS];
|
|
|
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
if (owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED;
|
|
|
|
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
|
|
WRITE_ONCE(*submit_qtail, owned_head);
|
|
WRITE_ONCE(*bypass_qtail, &pcl->next);
|
|
|
|
qtail[JQ_BYPASS] = &pcl->next;
|
|
}
|
|
|
|
static void z_erofs_decompressqueue_endio(struct bio *bio)
|
|
{
|
|
tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private);
|
|
struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t);
|
|
blk_status_t err = bio->bi_status;
|
|
struct bio_vec *bvec;
|
|
struct bvec_iter_all iter_all;
|
|
|
|
bio_for_each_segment_all(bvec, bio, iter_all) {
|
|
struct page *page = bvec->bv_page;
|
|
|
|
DBG_BUGON(PageUptodate(page));
|
|
DBG_BUGON(z_erofs_page_is_invalidated(page));
|
|
|
|
if (erofs_page_is_managed(EROFS_SB(q->sb), page)) {
|
|
if (!err)
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
}
|
|
}
|
|
if (err)
|
|
q->eio = true;
|
|
z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
|
|
struct page **pagepool,
|
|
struct z_erofs_decompressqueue *fgq,
|
|
bool *force_fg)
|
|
{
|
|
struct super_block *sb = f->inode->i_sb;
|
|
struct address_space *mc = MNGD_MAPPING(EROFS_SB(sb));
|
|
z_erofs_next_pcluster_t qtail[NR_JOBQUEUES];
|
|
struct z_erofs_decompressqueue *q[NR_JOBQUEUES];
|
|
void *bi_private;
|
|
z_erofs_next_pcluster_t owned_head = f->owned_head;
|
|
/* bio is NULL initially, so no need to initialize last_{index,bdev} */
|
|
pgoff_t last_index;
|
|
struct block_device *last_bdev;
|
|
unsigned int nr_bios = 0;
|
|
struct bio *bio = NULL;
|
|
|
|
bi_private = jobqueueset_init(sb, q, fgq, force_fg);
|
|
qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
|
|
qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
|
|
|
|
/* by default, all need io submission */
|
|
q[JQ_SUBMIT]->head = owned_head;
|
|
|
|
do {
|
|
struct erofs_map_dev mdev;
|
|
struct z_erofs_pcluster *pcl;
|
|
pgoff_t cur, end;
|
|
unsigned int i = 0;
|
|
bool bypass = true;
|
|
|
|
/* no possible 'owned_head' equals the following */
|
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL);
|
|
|
|
pcl = container_of(owned_head, struct z_erofs_pcluster, next);
|
|
|
|
/* close the main owned chain at first */
|
|
owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
|
|
Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
if (z_erofs_is_inline_pcluster(pcl)) {
|
|
move_to_bypass_jobqueue(pcl, qtail, owned_head);
|
|
continue;
|
|
}
|
|
|
|
/* no device id here, thus it will always succeed */
|
|
mdev = (struct erofs_map_dev) {
|
|
.m_pa = blknr_to_addr(pcl->obj.index),
|
|
};
|
|
(void)erofs_map_dev(sb, &mdev);
|
|
|
|
cur = erofs_blknr(mdev.m_pa);
|
|
end = cur + pcl->pclusterpages;
|
|
|
|
do {
|
|
struct page *page;
|
|
|
|
page = pickup_page_for_submission(pcl, i++, pagepool,
|
|
mc);
|
|
if (!page)
|
|
continue;
|
|
|
|
if (bio && (cur != last_index + 1 ||
|
|
last_bdev != mdev.m_bdev)) {
|
|
submit_bio_retry:
|
|
submit_bio(bio);
|
|
bio = NULL;
|
|
}
|
|
|
|
if (!bio) {
|
|
bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS,
|
|
REQ_OP_READ, GFP_NOIO);
|
|
bio->bi_end_io = z_erofs_decompressqueue_endio;
|
|
|
|
last_bdev = mdev.m_bdev;
|
|
bio->bi_iter.bi_sector = (sector_t)cur <<
|
|
LOG_SECTORS_PER_BLOCK;
|
|
bio->bi_private = bi_private;
|
|
if (f->readahead)
|
|
bio->bi_opf |= REQ_RAHEAD;
|
|
++nr_bios;
|
|
}
|
|
|
|
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
|
|
goto submit_bio_retry;
|
|
|
|
last_index = cur;
|
|
bypass = false;
|
|
} while (++cur < end);
|
|
|
|
if (!bypass)
|
|
qtail[JQ_SUBMIT] = &pcl->next;
|
|
else
|
|
move_to_bypass_jobqueue(pcl, qtail, owned_head);
|
|
} while (owned_head != Z_EROFS_PCLUSTER_TAIL);
|
|
|
|
if (bio)
|
|
submit_bio(bio);
|
|
|
|
/*
|
|
* 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) {
|
|
kvfree(q[JQ_SUBMIT]);
|
|
return;
|
|
}
|
|
z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios);
|
|
}
|
|
|
|
static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f,
|
|
struct page **pagepool, bool force_fg)
|
|
{
|
|
struct z_erofs_decompressqueue io[NR_JOBQUEUES];
|
|
|
|
if (f->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
return;
|
|
z_erofs_submit_queue(f, pagepool, io, &force_fg);
|
|
|
|
/* handle bypass queue (no i/o pclusters) immediately */
|
|
z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool);
|
|
|
|
if (!force_fg)
|
|
return;
|
|
|
|
/* wait until all bios are completed */
|
|
wait_for_completion_io(&io[JQ_SUBMIT].u.done);
|
|
|
|
/* handle synchronous decompress queue in the caller context */
|
|
z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool);
|
|
}
|
|
|
|
/*
|
|
* Since partial uptodate is still unimplemented for now, we have to use
|
|
* approximate readmore strategies as a start.
|
|
*/
|
|
static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f,
|
|
struct readahead_control *rac,
|
|
erofs_off_t end,
|
|
struct page **pagepool,
|
|
bool backmost)
|
|
{
|
|
struct inode *inode = f->inode;
|
|
struct erofs_map_blocks *map = &f->map;
|
|
erofs_off_t cur;
|
|
int err;
|
|
|
|
if (backmost) {
|
|
map->m_la = end;
|
|
err = z_erofs_map_blocks_iter(inode, map,
|
|
EROFS_GET_BLOCKS_READMORE);
|
|
if (err)
|
|
return;
|
|
|
|
/* expend ra for the trailing edge if readahead */
|
|
if (rac) {
|
|
loff_t newstart = readahead_pos(rac);
|
|
|
|
cur = round_up(map->m_la + map->m_llen, PAGE_SIZE);
|
|
readahead_expand(rac, newstart, cur - newstart);
|
|
return;
|
|
}
|
|
end = round_up(end, PAGE_SIZE);
|
|
} else {
|
|
end = round_up(map->m_la, PAGE_SIZE);
|
|
|
|
if (!map->m_llen)
|
|
return;
|
|
}
|
|
|
|
cur = map->m_la + map->m_llen - 1;
|
|
while (cur >= end) {
|
|
pgoff_t index = cur >> PAGE_SHIFT;
|
|
struct page *page;
|
|
|
|
page = erofs_grab_cache_page_nowait(inode->i_mapping, index);
|
|
if (page) {
|
|
if (PageUptodate(page)) {
|
|
unlock_page(page);
|
|
} else {
|
|
err = z_erofs_do_read_page(f, page, pagepool);
|
|
if (err)
|
|
erofs_err(inode->i_sb,
|
|
"readmore error at page %lu @ nid %llu",
|
|
index, EROFS_I(inode)->nid);
|
|
}
|
|
put_page(page);
|
|
}
|
|
|
|
if (cur < PAGE_SIZE)
|
|
break;
|
|
cur = (index << PAGE_SHIFT) - 1;
|
|
}
|
|
}
|
|
|
|
static int z_erofs_read_folio(struct file *file, struct folio *folio)
|
|
{
|
|
struct page *page = &folio->page;
|
|
struct inode *const inode = page->mapping->host;
|
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
|
|
struct page *pagepool = NULL;
|
|
int err;
|
|
|
|
trace_erofs_readpage(page, false);
|
|
f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT;
|
|
|
|
z_erofs_pcluster_readmore(&f, NULL, f.headoffset + PAGE_SIZE - 1,
|
|
&pagepool, true);
|
|
err = z_erofs_do_read_page(&f, page, &pagepool);
|
|
z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false);
|
|
|
|
(void)z_erofs_collector_end(&f);
|
|
|
|
/* if some compressed cluster ready, need submit them anyway */
|
|
z_erofs_runqueue(&f, &pagepool,
|
|
z_erofs_get_sync_decompress_policy(sbi, 0));
|
|
|
|
if (err)
|
|
erofs_err(inode->i_sb, "failed to read, err [%d]", err);
|
|
|
|
erofs_put_metabuf(&f.map.buf);
|
|
erofs_release_pages(&pagepool);
|
|
return err;
|
|
}
|
|
|
|
static void z_erofs_readahead(struct readahead_control *rac)
|
|
{
|
|
struct inode *const inode = rac->mapping->host;
|
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
|
|
struct page *pagepool = NULL, *head = NULL, *page;
|
|
unsigned int nr_pages;
|
|
|
|
f.readahead = true;
|
|
f.headoffset = readahead_pos(rac);
|
|
|
|
z_erofs_pcluster_readmore(&f, rac, f.headoffset +
|
|
readahead_length(rac) - 1, &pagepool, true);
|
|
nr_pages = readahead_count(rac);
|
|
trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false);
|
|
|
|
while ((page = readahead_page(rac))) {
|
|
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)
|
|
erofs_err(inode->i_sb,
|
|
"readahead error at page %lu @ nid %llu",
|
|
page->index, EROFS_I(inode)->nid);
|
|
put_page(page);
|
|
}
|
|
z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false);
|
|
(void)z_erofs_collector_end(&f);
|
|
|
|
z_erofs_runqueue(&f, &pagepool,
|
|
z_erofs_get_sync_decompress_policy(sbi, nr_pages));
|
|
erofs_put_metabuf(&f.map.buf);
|
|
erofs_release_pages(&pagepool);
|
|
}
|
|
|
|
const struct address_space_operations z_erofs_aops = {
|
|
.read_folio = z_erofs_read_folio,
|
|
.readahead = z_erofs_readahead,
|
|
};
|