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- use HTTPS links instead of insecure HTTP ones; - fix crossing page boundary on specific extended inodes; - remove useless WQ_CPU_INTENSIVE flag for unbound wq; - minor cleanup. -----BEGIN PGP SIGNATURE----- iIsEABYIADMWIQThPAmQN9sSA0DVxtI5NzHcH7XmBAUCXytmoBUcaHNpYW5na2Fv QHJlZGhhdC5jb20ACgkQOTcx3B+15gSg8gEA/LwZy3e/Tnor9CP2Mc+QSMPmuhvX ZwsxOyYqYGkVtlcBAMLKiBu96hqH+V3AOPHNfqS19N3fdjs34CEp/wbl1x8G =I/Yp -----END PGP SIGNATURE----- Merge tag 'erofs-for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs Pull erofs updates from Gao Xiang: "This cycle mainly addresses an issue out of some extended inode with designated location, which are not generated by current mkfs but need to handled at runtime anyway. The others are quite trivial ones. - use HTTPS links instead of insecure HTTP ones; - fix crossing page boundary on specific extended inodes; - remove useless WQ_CPU_INTENSIVE flag for unbound wq; - minor cleanup" * tag 'erofs-for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: remove WQ_CPU_INTENSIVE flag from unbound wq's erofs: fold in used-once helper erofs_workgroup_unfreeze_final() erofs: fix extended inode could cross boundary erofs: Replace HTTP links with HTTPS ones
1367 lines
35 KiB
C
1367 lines
35 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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* Created by Gao Xiang <gaoxiang25@huawei.com>
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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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* 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 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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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 *pcluster_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(pcluster_cachep);
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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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static void z_erofs_pcluster_init_once(void *ptr)
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{
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struct z_erofs_pcluster *pcl = ptr;
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struct z_erofs_collection *cl = z_erofs_primarycollection(pcl);
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unsigned int i;
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mutex_init(&cl->lock);
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cl->nr_pages = 0;
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cl->vcnt = 0;
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for (i = 0; i < Z_EROFS_CLUSTER_MAX_PAGES; ++i)
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pcl->compressed_pages[i] = NULL;
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}
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int __init z_erofs_init_zip_subsystem(void)
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{
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pcluster_cachep = kmem_cache_create("erofs_compress",
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Z_EROFS_WORKGROUP_SIZE, 0,
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SLAB_RECLAIM_ACCOUNT,
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z_erofs_pcluster_init_once);
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if (pcluster_cachep) {
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if (!z_erofs_init_workqueue())
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return 0;
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kmem_cache_destroy(pcluster_cachep);
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}
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return -ENOMEM;
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}
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enum z_erofs_collectmode {
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COLLECT_SECONDARY,
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COLLECT_PRIMARY,
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/*
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* The current collection was the tail of an exist chain, in addition
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* that the previous processed chained collections 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 collections which are
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* not processed yet, therefore different from COLLECT_PRIMARY_FOLLOWED,
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* the next collection cannot reuse the whole page safely in
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* 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 cl) | (belongs to the current cl) |
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* |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________|
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*/
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COLLECT_PRIMARY_HOOKED,
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COLLECT_PRIMARY_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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* | 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 as inplace I/O. ]
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*/
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COLLECT_PRIMARY_FOLLOWED,
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};
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struct z_erofs_collector {
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struct z_erofs_pagevec_ctor vector;
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struct z_erofs_pcluster *pcl, *tailpcl;
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struct z_erofs_collection *cl;
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struct page **compressedpages;
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z_erofs_next_pcluster_t owned_head;
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enum z_erofs_collectmode mode;
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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 z_erofs_collector clt;
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struct erofs_map_blocks map;
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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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};
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#define COLLECTOR_INIT() { \
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.owned_head = Z_EROFS_PCLUSTER_TAIL, \
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.mode = COLLECT_PRIMARY_FOLLOWED }
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#define DECOMPRESS_FRONTEND_INIT(__i) { \
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.inode = __i, .clt = COLLECTOR_INIT(), \
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.backmost = true, }
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static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES];
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static DEFINE_MUTEX(z_pagemap_global_lock);
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static void preload_compressed_pages(struct z_erofs_collector *clt,
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struct address_space *mc,
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enum z_erofs_cache_alloctype type,
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struct list_head *pagepool)
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{
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const struct z_erofs_pcluster *pcl = clt->pcl;
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const unsigned int clusterpages = BIT(pcl->clusterbits);
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struct page **pages = clt->compressedpages;
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pgoff_t index = pcl->obj.index + (pages - pcl->compressed_pages);
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bool standalone = true;
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if (clt->mode < COLLECT_PRIMARY_FOLLOWED)
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return;
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for (; pages < pcl->compressed_pages + clusterpages; ++pages) {
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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))
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continue;
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page = find_get_page(mc, index);
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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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clt->compressedpages = pages;
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standalone = false;
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continue;
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}
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if (!cmpxchg_relaxed(pages, 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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if (standalone) /* downgrade to PRIMARY_FOLLOWED_NOINPLACE */
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clt->mode = COLLECT_PRIMARY_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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struct address_space *const mapping = MNGD_MAPPING(sbi);
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const unsigned int clusterpages = BIT(pcl->clusterbits);
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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 = pcl->compressed_pages[i];
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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 (page->mapping != mapping)
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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_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 z_erofs_pcluster *const pcl = (void *)page_private(page);
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const unsigned int clusterpages = BIT(pcl->clusterbits);
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int ret = 0; /* 0 - busy */
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if (erofs_workgroup_try_to_freeze(&pcl->obj, 1)) {
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unsigned int i;
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for (i = 0; i < clusterpages; ++i) {
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if (pcl->compressed_pages[i] == page) {
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WRITE_ONCE(pcl->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(&pcl->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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/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */
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static inline bool z_erofs_try_inplace_io(struct z_erofs_collector *clt,
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struct page *page)
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{
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struct z_erofs_pcluster *const pcl = clt->pcl;
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const unsigned int clusterpages = BIT(pcl->clusterbits);
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while (clt->compressedpages < pcl->compressed_pages + clusterpages) {
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if (!cmpxchg(clt->compressedpages++, 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 collection lock held */
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static int z_erofs_attach_page(struct z_erofs_collector *clt,
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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 inplaceio */
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if (clt->mode >= COLLECT_PRIMARY &&
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type == Z_EROFS_PAGE_TYPE_EXCLUSIVE &&
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z_erofs_try_inplace_io(clt, page))
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return 0;
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ret = z_erofs_pagevec_enqueue(&clt->vector,
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page, type, &occupied);
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clt->cl->vcnt += (unsigned int)ret;
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return ret ? 0 : -EAGAIN;
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}
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static enum z_erofs_collectmode
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try_to_claim_pcluster(struct z_erofs_pcluster *pcl,
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z_erofs_next_pcluster_t *owned_head)
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{
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/* let's claim these following types of pclusters */
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retry:
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if (pcl->next == Z_EROFS_PCLUSTER_NIL) {
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/* type 1, nil pcluster */
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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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goto retry;
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*owned_head = &pcl->next;
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/* lucky, I am the followee :) */
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return COLLECT_PRIMARY_FOLLOWED;
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} else if (pcl->next == Z_EROFS_PCLUSTER_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(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
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*owned_head) != Z_EROFS_PCLUSTER_TAIL)
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goto retry;
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*owned_head = Z_EROFS_PCLUSTER_TAIL;
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return COLLECT_PRIMARY_HOOKED;
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}
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return COLLECT_PRIMARY; /* :( better luck next time */
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}
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static int z_erofs_lookup_collection(struct z_erofs_collector *clt,
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struct inode *inode,
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struct erofs_map_blocks *map)
|
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{
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struct z_erofs_pcluster *pcl = clt->pcl;
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struct z_erofs_collection *cl;
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unsigned int length;
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|
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/* to avoid unexpected loop formed by corrupted images */
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if (clt->owned_head == &pcl->next || pcl == clt->tailpcl) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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cl = z_erofs_primarycollection(pcl);
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if (cl->pageofs != (map->m_la & ~PAGE_MASK)) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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length = READ_ONCE(pcl->length);
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if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) {
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if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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} else {
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unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT;
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if (map->m_flags & EROFS_MAP_FULL_MAPPED)
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llen |= Z_EROFS_PCLUSTER_FULL_LENGTH;
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while (llen > length &&
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length != cmpxchg_relaxed(&pcl->length, length, llen)) {
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cpu_relax();
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length = READ_ONCE(pcl->length);
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}
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}
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mutex_lock(&cl->lock);
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/* used to check tail merging loop due to corrupted images */
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if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
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clt->tailpcl = pcl;
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clt->mode = try_to_claim_pcluster(pcl, &clt->owned_head);
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/* clean tailpcl if the current owned_head is Z_EROFS_PCLUSTER_TAIL */
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if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
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clt->tailpcl = NULL;
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clt->cl = cl;
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return 0;
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}
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static int z_erofs_register_collection(struct z_erofs_collector *clt,
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struct inode *inode,
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struct erofs_map_blocks *map)
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{
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struct z_erofs_pcluster *pcl;
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struct z_erofs_collection *cl;
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struct erofs_workgroup *grp;
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int err;
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/* no available workgroup, let's allocate one */
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pcl = kmem_cache_alloc(pcluster_cachep, GFP_NOFS);
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if (!pcl)
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return -ENOMEM;
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atomic_set(&pcl->obj.refcount, 1);
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pcl->obj.index = map->m_pa >> PAGE_SHIFT;
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pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) |
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(map->m_flags & EROFS_MAP_FULL_MAPPED ?
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Z_EROFS_PCLUSTER_FULL_LENGTH : 0);
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|
|
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if (map->m_flags & EROFS_MAP_ZIPPED)
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pcl->algorithmformat = Z_EROFS_COMPRESSION_LZ4;
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else
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pcl->algorithmformat = Z_EROFS_COMPRESSION_SHIFTED;
|
|
|
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pcl->clusterbits = EROFS_I(inode)->z_physical_clusterbits[0];
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pcl->clusterbits -= PAGE_SHIFT;
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|
|
|
/* new pclusters should be claimed as type 1, primary and followed */
|
|
pcl->next = clt->owned_head;
|
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clt->mode = COLLECT_PRIMARY_FOLLOWED;
|
|
|
|
cl = z_erofs_primarycollection(pcl);
|
|
|
|
/* must be cleaned before freeing to slab */
|
|
DBG_BUGON(cl->nr_pages);
|
|
DBG_BUGON(cl->vcnt);
|
|
|
|
cl->pageofs = map->m_la & ~PAGE_MASK;
|
|
|
|
/*
|
|
* lock all primary followed works before visible to others
|
|
* and mutex_trylock *never* fails for a new pcluster.
|
|
*/
|
|
DBG_BUGON(!mutex_trylock(&cl->lock));
|
|
|
|
grp = erofs_insert_workgroup(inode->i_sb, &pcl->obj);
|
|
if (IS_ERR(grp)) {
|
|
err = PTR_ERR(grp);
|
|
goto err_out;
|
|
}
|
|
|
|
if (grp != &pcl->obj) {
|
|
clt->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 (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
clt->tailpcl = pcl;
|
|
clt->owned_head = &pcl->next;
|
|
clt->pcl = pcl;
|
|
clt->cl = cl;
|
|
return 0;
|
|
|
|
err_out:
|
|
mutex_unlock(&cl->lock);
|
|
kmem_cache_free(pcluster_cachep, pcl);
|
|
return err;
|
|
}
|
|
|
|
static int z_erofs_collector_begin(struct z_erofs_collector *clt,
|
|
struct inode *inode,
|
|
struct erofs_map_blocks *map)
|
|
{
|
|
struct erofs_workgroup *grp;
|
|
int ret;
|
|
|
|
DBG_BUGON(clt->cl);
|
|
|
|
/* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous collection */
|
|
DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_NIL);
|
|
DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
|
|
if (!PAGE_ALIGNED(map->m_pa)) {
|
|
DBG_BUGON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT);
|
|
if (grp) {
|
|
clt->pcl = container_of(grp, struct z_erofs_pcluster, obj);
|
|
} else {
|
|
ret = z_erofs_register_collection(clt, inode, map);
|
|
|
|
if (!ret)
|
|
goto out;
|
|
if (ret != -EEXIST)
|
|
return ret;
|
|
}
|
|
|
|
ret = z_erofs_lookup_collection(clt, inode, map);
|
|
if (ret) {
|
|
erofs_workgroup_put(&clt->pcl->obj);
|
|
return ret;
|
|
}
|
|
|
|
out:
|
|
z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS,
|
|
clt->cl->pagevec, clt->cl->vcnt);
|
|
|
|
clt->compressedpages = clt->pcl->compressed_pages;
|
|
if (clt->mode <= COLLECT_PRIMARY) /* cannot do in-place I/O */
|
|
clt->compressedpages += Z_EROFS_CLUSTER_MAX_PAGES;
|
|
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)
|
|
{
|
|
struct z_erofs_collection *const cl =
|
|
container_of(head, struct z_erofs_collection, rcu);
|
|
|
|
kmem_cache_free(pcluster_cachep,
|
|
container_of(cl, struct z_erofs_pcluster,
|
|
primary_collection));
|
|
}
|
|
|
|
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp)
|
|
{
|
|
struct z_erofs_pcluster *const pcl =
|
|
container_of(grp, struct z_erofs_pcluster, obj);
|
|
struct z_erofs_collection *const cl = z_erofs_primarycollection(pcl);
|
|
|
|
call_rcu(&cl->rcu, z_erofs_rcu_callback);
|
|
}
|
|
|
|
static void z_erofs_collection_put(struct z_erofs_collection *cl)
|
|
{
|
|
struct z_erofs_pcluster *const pcl =
|
|
container_of(cl, struct z_erofs_pcluster, primary_collection);
|
|
|
|
erofs_workgroup_put(&pcl->obj);
|
|
}
|
|
|
|
static bool z_erofs_collector_end(struct z_erofs_collector *clt)
|
|
{
|
|
struct z_erofs_collection *cl = clt->cl;
|
|
|
|
if (!cl)
|
|
return false;
|
|
|
|
z_erofs_pagevec_ctor_exit(&clt->vector, false);
|
|
mutex_unlock(&cl->lock);
|
|
|
|
/*
|
|
* if all pending pages are added, don't hold its reference
|
|
* any longer if the pcluster isn't hosted by ourselves.
|
|
*/
|
|
if (clt->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE)
|
|
z_erofs_collection_put(cl);
|
|
|
|
clt->cl = 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 list_head *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;
|
|
struct z_erofs_collector *const clt = &fe->clt;
|
|
const loff_t offset = page_offset(page);
|
|
bool tight = true;
|
|
|
|
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 collection previously (very rare) */
|
|
if (!clt->cl)
|
|
goto restart_now;
|
|
goto hitted;
|
|
}
|
|
|
|
/* go ahead the next map_blocks */
|
|
erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur);
|
|
|
|
if (z_erofs_collector_end(clt))
|
|
fe->backmost = false;
|
|
|
|
map->m_la = offset + cur;
|
|
map->m_llen = 0;
|
|
err = z_erofs_map_blocks_iter(inode, map, 0);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
restart_now:
|
|
if (!(map->m_flags & EROFS_MAP_MAPPED))
|
|
goto hitted;
|
|
|
|
err = z_erofs_collector_begin(clt, inode, map);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
/* preload all compressed pages (maybe downgrade role if necessary) */
|
|
if (should_alloc_managed_pages(fe, sbi->ctx.cache_strategy, map->m_la))
|
|
cache_strategy = DELAYEDALLOC;
|
|
else
|
|
cache_strategy = DONTALLOC;
|
|
|
|
preload_compressed_pages(clt, MNGD_MAPPING(sbi),
|
|
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 pagevec (should be processed in strict order.)
|
|
*/
|
|
tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED &&
|
|
clt->mode != COLLECT_PRIMARY_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;
|
|
}
|
|
|
|
/* 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 &= (clt->mode >= COLLECT_PRIMARY_FOLLOWED);
|
|
|
|
retry:
|
|
err = z_erofs_attach_page(clt, page, page_type);
|
|
/* should allocate an additional staging page for pagevec */
|
|
if (err == -EAGAIN) {
|
|
struct page *const newpage =
|
|
erofs_allocpage(pagepool, GFP_NOFS | __GFP_NOFAIL);
|
|
|
|
newpage->mapping = Z_EROFS_MAPPING_STAGING;
|
|
err = z_erofs_attach_page(clt, newpage,
|
|
Z_EROFS_PAGE_TYPE_EXCLUSIVE);
|
|
if (!err)
|
|
goto retry;
|
|
}
|
|
|
|
if (err)
|
|
goto err_out;
|
|
|
|
index = page->index - (map->m_la >> PAGE_SHIFT);
|
|
|
|
z_erofs_onlinepage_fixup(page, index, true);
|
|
|
|
/* bump up the number of spiltted parts of a page */
|
|
++spiltted;
|
|
/* also update nr_pages */
|
|
clt->cl->nr_pages = max_t(pgoff_t, clt->cl->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:
|
|
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;
|
|
|
|
/* if some error occurred while processing this page */
|
|
err_out:
|
|
SetPageError(page);
|
|
goto out;
|
|
}
|
|
|
|
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
|
|
bool sync, int bios)
|
|
{
|
|
/* wake up the caller thread for sync decompression */
|
|
if (sync) {
|
|
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 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(!page->mapping);
|
|
|
|
if (err)
|
|
SetPageError(page);
|
|
|
|
if (erofs_page_is_managed(EROFS_SB(q->sb), page)) {
|
|
if (!err)
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
}
|
|
}
|
|
z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static int z_erofs_decompress_pcluster(struct super_block *sb,
|
|
struct z_erofs_pcluster *pcl,
|
|
struct list_head *pagepool)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
const unsigned int clusterpages = BIT(pcl->clusterbits);
|
|
struct z_erofs_pagevec_ctor ctor;
|
|
unsigned int i, outputsize, llen, nr_pages;
|
|
struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES];
|
|
struct page **pages, **compressed_pages, *page;
|
|
|
|
enum z_erofs_page_type page_type;
|
|
bool overlapped, partial;
|
|
struct z_erofs_collection *cl;
|
|
int err;
|
|
|
|
might_sleep();
|
|
cl = z_erofs_primarycollection(pcl);
|
|
DBG_BUGON(!READ_ONCE(cl->nr_pages));
|
|
|
|
mutex_lock(&cl->lock);
|
|
nr_pages = cl->nr_pages;
|
|
|
|
if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) {
|
|
pages = pages_onstack;
|
|
} else if (nr_pages <= Z_EROFS_VMAP_GLOBAL_PAGES &&
|
|
mutex_trylock(&z_pagemap_global_lock)) {
|
|
pages = z_pagemap_global;
|
|
} else {
|
|
gfp_t gfp_flags = GFP_KERNEL;
|
|
|
|
if (nr_pages > Z_EROFS_VMAP_GLOBAL_PAGES)
|
|
gfp_flags |= __GFP_NOFAIL;
|
|
|
|
pages = kvmalloc_array(nr_pages, sizeof(struct page *),
|
|
gfp_flags);
|
|
|
|
/* fallback to global pagemap for the lowmem scenario */
|
|
if (!pages) {
|
|
mutex_lock(&z_pagemap_global_lock);
|
|
pages = z_pagemap_global;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nr_pages; ++i)
|
|
pages[i] = NULL;
|
|
|
|
err = 0;
|
|
z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS,
|
|
cl->pagevec, 0);
|
|
|
|
for (i = 0; i < cl->vcnt; ++i) {
|
|
unsigned int pagenr;
|
|
|
|
page = z_erofs_pagevec_dequeue(&ctor, &page_type);
|
|
|
|
/* all pages in pagevec ought to be valid */
|
|
DBG_BUGON(!page);
|
|
DBG_BUGON(!page->mapping);
|
|
|
|
if (z_erofs_put_stagingpage(pagepool, 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);
|
|
|
|
/*
|
|
* currently EROFS doesn't support multiref(dedup),
|
|
* so here erroring out one multiref page.
|
|
*/
|
|
if (pages[pagenr]) {
|
|
DBG_BUGON(1);
|
|
SetPageError(pages[pagenr]);
|
|
z_erofs_onlinepage_endio(pages[pagenr]);
|
|
err = -EFSCORRUPTED;
|
|
}
|
|
pages[pagenr] = page;
|
|
}
|
|
z_erofs_pagevec_ctor_exit(&ctor, true);
|
|
|
|
overlapped = false;
|
|
compressed_pages = pcl->compressed_pages;
|
|
|
|
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_page_is_staging(page)) {
|
|
if (erofs_page_is_managed(sbi, page)) {
|
|
if (!PageUptodate(page))
|
|
err = -EIO;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* only if non-head page can be selected
|
|
* for inplace decompression
|
|
*/
|
|
pagenr = z_erofs_onlinepage_index(page);
|
|
|
|
DBG_BUGON(pagenr >= nr_pages);
|
|
if (pages[pagenr]) {
|
|
DBG_BUGON(1);
|
|
SetPageError(pages[pagenr]);
|
|
z_erofs_onlinepage_endio(pages[pagenr]);
|
|
err = -EFSCORRUPTED;
|
|
}
|
|
pages[pagenr] = page;
|
|
|
|
overlapped = true;
|
|
}
|
|
|
|
/* PG_error needs checking for inplaced and staging pages */
|
|
if (PageError(page)) {
|
|
DBG_BUGON(PageUptodate(page));
|
|
err = -EIO;
|
|
}
|
|
}
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT;
|
|
if (nr_pages << PAGE_SHIFT >= cl->pageofs + llen) {
|
|
outputsize = llen;
|
|
partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH);
|
|
} else {
|
|
outputsize = (nr_pages << PAGE_SHIFT) - cl->pageofs;
|
|
partial = true;
|
|
}
|
|
|
|
err = z_erofs_decompress(&(struct z_erofs_decompress_req) {
|
|
.sb = sb,
|
|
.in = compressed_pages,
|
|
.out = pages,
|
|
.pageofs_out = cl->pageofs,
|
|
.inputsize = PAGE_SIZE,
|
|
.outputsize = outputsize,
|
|
.alg = pcl->algorithmformat,
|
|
.inplace_io = overlapped,
|
|
.partial_decoding = partial
|
|
}, pagepool);
|
|
|
|
out:
|
|
/* must handle all compressed pages before endding pages */
|
|
for (i = 0; i < clusterpages; ++i) {
|
|
page = compressed_pages[i];
|
|
|
|
if (erofs_page_is_managed(sbi, page))
|
|
continue;
|
|
|
|
/* recycle all individual staging pages */
|
|
(void)z_erofs_put_stagingpage(pagepool, 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_put_stagingpage(pagepool, page))
|
|
continue;
|
|
|
|
if (err < 0)
|
|
SetPageError(page);
|
|
|
|
z_erofs_onlinepage_endio(page);
|
|
}
|
|
|
|
if (pages == z_pagemap_global)
|
|
mutex_unlock(&z_pagemap_global_lock);
|
|
else if (pages != pages_onstack)
|
|
kvfree(pages);
|
|
|
|
cl->nr_pages = 0;
|
|
cl->vcnt = 0;
|
|
|
|
/* all cl locks MUST be taken before the following line */
|
|
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL);
|
|
|
|
/* all cl locks SHOULD be released right now */
|
|
mutex_unlock(&cl->lock);
|
|
|
|
z_erofs_collection_put(cl);
|
|
return err;
|
|
}
|
|
|
|
static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io,
|
|
struct list_head *pagepool)
|
|
{
|
|
z_erofs_next_pcluster_t owned = io->head;
|
|
|
|
while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) {
|
|
struct z_erofs_pcluster *pcl;
|
|
|
|
/* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */
|
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL);
|
|
|
|
/* no possible that 'owned' equals NULL */
|
|
DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL);
|
|
|
|
pcl = container_of(owned, struct z_erofs_pcluster, next);
|
|
owned = READ_ONCE(pcl->next);
|
|
|
|
z_erofs_decompress_pcluster(io->sb, pcl, pagepool);
|
|
}
|
|
}
|
|
|
|
static void z_erofs_decompressqueue_work(struct work_struct *work)
|
|
{
|
|
struct z_erofs_decompressqueue *bgq =
|
|
container_of(work, struct z_erofs_decompressqueue, u.work);
|
|
LIST_HEAD(pagepool);
|
|
|
|
DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
z_erofs_decompress_queue(bgq, &pagepool);
|
|
|
|
put_pages_list(&pagepool);
|
|
kvfree(bgq);
|
|
}
|
|
|
|
static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
|
|
unsigned int nr,
|
|
struct list_head *pagepool,
|
|
struct address_space *mc,
|
|
gfp_t gfp)
|
|
{
|
|
const pgoff_t index = pcl->obj.index;
|
|
bool tocache = false;
|
|
|
|
struct address_space *mapping;
|
|
struct page *oldpage, *page;
|
|
|
|
compressed_page_t t;
|
|
int justfound;
|
|
|
|
repeat:
|
|
page = READ_ONCE(pcl->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 (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);
|
|
|
|
/*
|
|
* 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(pcl->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)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 (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) {
|
|
/* non-LRU / non-movable temporary page is needed */
|
|
page->mapping = Z_EROFS_MAPPING_STAGING;
|
|
tocache = false;
|
|
}
|
|
|
|
if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) {
|
|
if (tocache) {
|
|
/* since it added to managed cache successfully */
|
|
unlock_page(page);
|
|
put_page(page);
|
|
} else {
|
|
list_add(&page->lru, pagepool);
|
|
}
|
|
cond_resched();
|
|
goto repeat;
|
|
}
|
|
set_page_private(page, (unsigned long)pcl);
|
|
SetPagePrivate(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_waitqueue_head(&fgq->u.wait);
|
|
atomic_set(&fgq->pending_bios, 0);
|
|
}
|
|
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_submit_queue(struct super_block *sb,
|
|
z_erofs_next_pcluster_t owned_head,
|
|
struct list_head *pagepool,
|
|
struct z_erofs_decompressqueue *fgq,
|
|
bool *force_fg)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
z_erofs_next_pcluster_t qtail[NR_JOBQUEUES];
|
|
struct z_erofs_decompressqueue *q[NR_JOBQUEUES];
|
|
void *bi_private;
|
|
/* since bio will be NULL, no need to initialize last_index */
|
|
pgoff_t last_index;
|
|
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 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);
|
|
|
|
cur = pcl->obj.index;
|
|
end = cur + BIT(pcl->clusterbits);
|
|
|
|
/* close the main owned chain at first */
|
|
owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
|
|
Z_EROFS_PCLUSTER_TAIL_CLOSED);
|
|
|
|
do {
|
|
struct page *page;
|
|
int err;
|
|
|
|
page = pickup_page_for_submission(pcl, i++, pagepool,
|
|
MNGD_MAPPING(sbi),
|
|
GFP_NOFS);
|
|
if (!page)
|
|
continue;
|
|
|
|
if (bio && cur != last_index + 1) {
|
|
submit_bio_retry:
|
|
submit_bio(bio);
|
|
bio = NULL;
|
|
}
|
|
|
|
if (!bio) {
|
|
bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
|
|
|
|
bio->bi_end_io = z_erofs_decompressqueue_endio;
|
|
bio_set_dev(bio, sb->s_bdev);
|
|
bio->bi_iter.bi_sector = (sector_t)cur <<
|
|
LOG_SECTORS_PER_BLOCK;
|
|
bio->bi_private = bi_private;
|
|
bio->bi_opf = REQ_OP_READ;
|
|
++nr_bios;
|
|
}
|
|
|
|
err = bio_add_page(bio, page, PAGE_SIZE, 0);
|
|
if (err < 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 super_block *sb,
|
|
struct z_erofs_collector *clt,
|
|
struct list_head *pagepool, bool force_fg)
|
|
{
|
|
struct z_erofs_decompressqueue io[NR_JOBQUEUES];
|
|
|
|
if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
return;
|
|
z_erofs_submit_queue(sb, clt->owned_head, 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 */
|
|
io_wait_event(io[JQ_SUBMIT].u.wait,
|
|
!atomic_read(&io[JQ_SUBMIT].pending_bios));
|
|
|
|
/* handle synchronous decompress queue in the caller context */
|
|
z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool);
|
|
}
|
|
|
|
static int z_erofs_readpage(struct file *file, struct page *page)
|
|
{
|
|
struct inode *const inode = page->mapping->host;
|
|
struct z_erofs_decompress_frontend f = DECOMPRESS_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_collector_end(&f.clt);
|
|
|
|
/* if some compressed cluster ready, need submit them anyway */
|
|
z_erofs_runqueue(inode->i_sb, &f.clt, &pagepool, true);
|
|
|
|
if (err)
|
|
erofs_err(inode->i_sb, "failed to read, err [%d]", err);
|
|
|
|
if (f.map.mpage)
|
|
put_page(f.map.mpage);
|
|
|
|
/* clean up the remaining free pages */
|
|
put_pages_list(&pagepool);
|
|
return err;
|
|
}
|
|
|
|
static bool should_decompress_synchronously(struct erofs_sb_info *sbi,
|
|
unsigned int nr)
|
|
{
|
|
return nr <= sbi->ctx.max_sync_decompress_pages;
|
|
}
|
|
|
|
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);
|
|
|
|
bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
|
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
|
|
struct page *page, *head = NULL;
|
|
LIST_HEAD(pagepool);
|
|
|
|
trace_erofs_readpages(inode, readahead_index(rac),
|
|
readahead_count(rac), false);
|
|
|
|
f.headoffset = readahead_pos(rac);
|
|
|
|
while ((page = readahead_page(rac))) {
|
|
prefetchw(&page->flags);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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);
|
|
}
|
|
|
|
(void)z_erofs_collector_end(&f.clt);
|
|
|
|
z_erofs_runqueue(inode->i_sb, &f.clt, &pagepool, sync);
|
|
|
|
if (f.map.mpage)
|
|
put_page(f.map.mpage);
|
|
|
|
/* clean up the remaining free pages */
|
|
put_pages_list(&pagepool);
|
|
}
|
|
|
|
const struct address_space_operations z_erofs_aops = {
|
|
.readpage = z_erofs_readpage,
|
|
.readahead = z_erofs_readahead,
|
|
};
|
|
|