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![Jingbo Xu](/assets/img/avatar_default.png)
Currently ztailpacking pclusters are chained with FOLLOWED_NOINPLACE and not recorded into the managed_pslots XArray. After commit7674a42f35
("erofs: use struct lockref to replace handcrafted approach"), ztailpacking pclusters won't be freed with erofs_workgroup_put() anymore, which will cause the following issue: BUG erofs_pcluster-1 (Tainted: G OE ): Objects remaining in erofs_pcluster-1 on __kmem_cache_shutdown() Use z_erofs_free_pcluster() directly to free ztailpacking pclusters. Fixes:7674a42f35
("erofs: use struct lockref to replace handcrafted approach") Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230822110530.96831-1-jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
1894 lines
48 KiB
C
1894 lines
48 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 "compress.h"
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#include <linux/psi.h>
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#include <linux/cpuhotplug.h>
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#include <trace/events/erofs.h>
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#define Z_EROFS_PCLUSTER_MAX_PAGES (Z_EROFS_PCLUSTER_MAX_SIZE / PAGE_SIZE)
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#define Z_EROFS_INLINE_BVECS 2
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/*
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* let's leave a type here in case of introducing
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* another tagged pointer later.
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*/
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typedef void *z_erofs_next_pcluster_t;
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struct z_erofs_bvec {
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struct page *page;
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int offset;
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unsigned int end;
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};
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#define __Z_EROFS_BVSET(name, total) \
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struct name { \
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/* point to the next page which contains the following bvecs */ \
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struct page *nextpage; \
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struct z_erofs_bvec bvec[total]; \
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}
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__Z_EROFS_BVSET(z_erofs_bvset,);
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__Z_EROFS_BVSET(z_erofs_bvset_inline, Z_EROFS_INLINE_BVECS);
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/*
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* Structure fields follow one of the following exclusion rules.
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*
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* I: Modifiable by initialization/destruction paths and read-only
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* for everyone else;
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*
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* L: Field should be protected by the pcluster lock;
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*
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* A: Field should be accessed / updated in atomic for parallelized code.
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*/
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struct z_erofs_pcluster {
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struct erofs_workgroup obj;
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struct mutex lock;
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/* A: point to next chained pcluster or TAILs */
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z_erofs_next_pcluster_t next;
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/* L: the maximum decompression size of this round */
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unsigned int length;
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/* L: total number of bvecs */
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unsigned int vcnt;
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/* I: page offset of start position of decompression */
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unsigned short pageofs_out;
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/* I: page offset of inline compressed data */
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unsigned short pageofs_in;
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union {
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/* L: inline a certain number of bvec for bootstrap */
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struct z_erofs_bvset_inline bvset;
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/* I: can be used to free the pcluster by RCU. */
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struct rcu_head rcu;
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};
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union {
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/* I: physical cluster size in pages */
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unsigned short pclusterpages;
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/* I: tailpacking inline compressed size */
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unsigned short tailpacking_size;
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};
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/* I: compression algorithm format */
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unsigned char algorithmformat;
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/* L: whether partial decompression or not */
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bool partial;
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/* L: indicate several pageofs_outs or not */
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bool multibases;
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/* A: compressed bvecs (can be cached or inplaced pages) */
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struct z_erofs_bvec compressed_bvecs[];
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};
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/* the end of a chain of pclusters */
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#define Z_EROFS_PCLUSTER_TAIL ((void *) 0x700 + POISON_POINTER_DELTA)
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#define Z_EROFS_PCLUSTER_NIL (NULL)
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struct z_erofs_decompressqueue {
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struct super_block *sb;
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atomic_t pending_bios;
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z_erofs_next_pcluster_t head;
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union {
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struct completion done;
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struct work_struct work;
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struct kthread_work kthread_work;
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} u;
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bool eio, sync;
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};
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static inline bool z_erofs_is_inline_pcluster(struct z_erofs_pcluster *pcl)
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{
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return !pcl->obj.index;
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}
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static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl)
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{
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if (z_erofs_is_inline_pcluster(pcl))
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return 1;
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return pcl->pclusterpages;
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}
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/*
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* bit 30: I/O error occurred on this page
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* bit 0 - 29: remaining parts to complete this page
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*/
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#define Z_EROFS_PAGE_EIO (1 << 30)
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static inline void z_erofs_onlinepage_init(struct page *page)
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{
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union {
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atomic_t o;
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unsigned long v;
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} u = { .o = ATOMIC_INIT(1) };
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set_page_private(page, u.v);
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smp_wmb();
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SetPagePrivate(page);
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}
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static inline void z_erofs_onlinepage_split(struct page *page)
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{
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atomic_inc((atomic_t *)&page->private);
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}
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static void z_erofs_onlinepage_endio(struct page *page, int err)
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{
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int orig, v;
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DBG_BUGON(!PagePrivate(page));
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do {
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orig = atomic_read((atomic_t *)&page->private);
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v = (orig - 1) | (err ? Z_EROFS_PAGE_EIO : 0);
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} while (atomic_cmpxchg((atomic_t *)&page->private, orig, v) != orig);
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if (!(v & ~Z_EROFS_PAGE_EIO)) {
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set_page_private(page, 0);
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ClearPagePrivate(page);
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if (!(v & Z_EROFS_PAGE_EIO))
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SetPageUptodate(page);
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unlock_page(page);
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}
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}
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#define Z_EROFS_ONSTACK_PAGES 32
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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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struct page **pagepool)
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{
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if (iter->cur >= iter->nr) {
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struct page *nextpage = *candidate_bvpage;
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if (!nextpage) {
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nextpage = erofs_allocpage(pagepool, GFP_NOFS);
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if (!nextpage)
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return -ENOMEM;
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set_page_private(nextpage, Z_EROFS_SHORTLIVED_PAGE);
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}
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DBG_BUGON(iter->bvset->nextpage);
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iter->bvset->nextpage = nextpage;
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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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static struct workqueue_struct *z_erofs_workqueue __read_mostly;
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#ifdef CONFIG_EROFS_FS_PCPU_KTHREAD
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static struct kthread_worker __rcu **z_erofs_pcpu_workers;
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static void erofs_destroy_percpu_workers(void)
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{
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struct kthread_worker *worker;
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unsigned int cpu;
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for_each_possible_cpu(cpu) {
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worker = rcu_dereference_protected(
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z_erofs_pcpu_workers[cpu], 1);
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rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL);
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if (worker)
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kthread_destroy_worker(worker);
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}
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kfree(z_erofs_pcpu_workers);
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}
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static struct kthread_worker *erofs_init_percpu_worker(int cpu)
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{
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struct kthread_worker *worker =
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kthread_create_worker_on_cpu(cpu, 0, "erofs_worker/%u", cpu);
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if (IS_ERR(worker))
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return worker;
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if (IS_ENABLED(CONFIG_EROFS_FS_PCPU_KTHREAD_HIPRI))
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sched_set_fifo_low(worker->task);
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return worker;
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}
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static int erofs_init_percpu_workers(void)
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{
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struct kthread_worker *worker;
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unsigned int cpu;
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z_erofs_pcpu_workers = kcalloc(num_possible_cpus(),
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sizeof(struct kthread_worker *), GFP_ATOMIC);
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if (!z_erofs_pcpu_workers)
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return -ENOMEM;
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for_each_online_cpu(cpu) { /* could miss cpu{off,on}line? */
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worker = erofs_init_percpu_worker(cpu);
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if (!IS_ERR(worker))
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rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker);
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}
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return 0;
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}
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#else
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static inline void erofs_destroy_percpu_workers(void) {}
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static inline int erofs_init_percpu_workers(void) { return 0; }
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#endif
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#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_EROFS_FS_PCPU_KTHREAD)
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static DEFINE_SPINLOCK(z_erofs_pcpu_worker_lock);
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static enum cpuhp_state erofs_cpuhp_state;
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static int erofs_cpu_online(unsigned int cpu)
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{
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struct kthread_worker *worker, *old;
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worker = erofs_init_percpu_worker(cpu);
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if (IS_ERR(worker))
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return PTR_ERR(worker);
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spin_lock(&z_erofs_pcpu_worker_lock);
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old = rcu_dereference_protected(z_erofs_pcpu_workers[cpu],
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lockdep_is_held(&z_erofs_pcpu_worker_lock));
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if (!old)
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rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker);
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spin_unlock(&z_erofs_pcpu_worker_lock);
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if (old)
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kthread_destroy_worker(worker);
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return 0;
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}
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static int erofs_cpu_offline(unsigned int cpu)
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{
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struct kthread_worker *worker;
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spin_lock(&z_erofs_pcpu_worker_lock);
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worker = rcu_dereference_protected(z_erofs_pcpu_workers[cpu],
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lockdep_is_held(&z_erofs_pcpu_worker_lock));
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rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL);
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spin_unlock(&z_erofs_pcpu_worker_lock);
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synchronize_rcu();
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if (worker)
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kthread_destroy_worker(worker);
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return 0;
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}
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static int erofs_cpu_hotplug_init(void)
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{
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int state;
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state = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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"fs/erofs:online", erofs_cpu_online, erofs_cpu_offline);
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if (state < 0)
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return state;
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erofs_cpuhp_state = state;
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return 0;
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}
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static void erofs_cpu_hotplug_destroy(void)
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{
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if (erofs_cpuhp_state)
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cpuhp_remove_state_nocalls(erofs_cpuhp_state);
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}
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#else /* !CONFIG_HOTPLUG_CPU || !CONFIG_EROFS_FS_PCPU_KTHREAD */
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static inline int erofs_cpu_hotplug_init(void) { return 0; }
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static inline void erofs_cpu_hotplug_destroy(void) {}
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#endif
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void z_erofs_exit_zip_subsystem(void)
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{
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erofs_cpu_hotplug_destroy();
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erofs_destroy_percpu_workers();
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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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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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goto out_error_pcluster_pool;
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z_erofs_workqueue = alloc_workqueue("erofs_worker",
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WQ_UNBOUND | WQ_HIGHPRI, num_possible_cpus());
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if (!z_erofs_workqueue) {
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err = -ENOMEM;
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goto out_error_workqueue_init;
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}
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err = erofs_init_percpu_workers();
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if (err)
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goto out_error_pcpu_worker;
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err = erofs_cpu_hotplug_init();
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if (err < 0)
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goto out_error_cpuhp_init;
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return err;
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out_error_cpuhp_init:
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erofs_destroy_percpu_workers();
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out_error_pcpu_worker:
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destroy_workqueue(z_erofs_workqueue);
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out_error_workqueue_init:
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z_erofs_destroy_pcluster_pool();
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out_error_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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/*
|
|
* a weak form of Z_EROFS_PCLUSTER_FOLLOWED, the difference is that it
|
|
* could be dispatched into bypass queue later due to uptodated managed
|
|
* pages. All related online pages cannot be reused for inplace I/O (or
|
|
* bvpage) since it can be directly decoded without I/O submission.
|
|
*/
|
|
Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE,
|
|
/*
|
|
* The pcluster was just linked to a decompression chain by us. It can
|
|
* also be linked with the remaining pclusters, which means if the
|
|
* processing page is the tail page of a pcluster, this pcluster can
|
|
* safely use the whole page (since the previous pcluster is within the
|
|
* same chain) for in-place I/O, as illustrated below:
|
|
* ___________________________________________________
|
|
* | tail (partial) page | head (partial) page |
|
|
* | (of the current pcl) | (of the previous pcl) |
|
|
* |___PCLUSTER_FOLLOWED___|_____PCLUSTER_FOLLOWED_____|
|
|
*
|
|
* [ (*) the page above can be used as inplace I/O. ]
|
|
*/
|
|
Z_EROFS_PCLUSTER_FOLLOWED,
|
|
};
|
|
|
|
struct z_erofs_decompress_frontend {
|
|
struct inode *const inode;
|
|
struct erofs_map_blocks map;
|
|
struct z_erofs_bvec_iter biter;
|
|
|
|
struct page *pagepool;
|
|
struct page *candidate_bvpage;
|
|
struct z_erofs_pcluster *pcl;
|
|
z_erofs_next_pcluster_t owned_head;
|
|
enum z_erofs_pclustermode mode;
|
|
|
|
erofs_off_t headoffset;
|
|
|
|
/* a pointer used to pick up inplace I/O pages */
|
|
unsigned int icur;
|
|
};
|
|
|
|
#define DECOMPRESS_FRONTEND_INIT(__i) { \
|
|
.inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \
|
|
.mode = Z_EROFS_PCLUSTER_FOLLOWED }
|
|
|
|
static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
unsigned int cachestrategy = EROFS_I_SB(fe->inode)->opt.cache_strategy;
|
|
|
|
if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED)
|
|
return false;
|
|
|
|
if (!(fe->map.m_flags & EROFS_MAP_FULL_MAPPED))
|
|
return true;
|
|
|
|
if (cachestrategy >= EROFS_ZIP_CACHE_READAROUND &&
|
|
fe->map.m_la < fe->headoffset)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode));
|
|
struct z_erofs_pcluster *pcl = fe->pcl;
|
|
bool shouldalloc = z_erofs_should_alloc_cache(fe);
|
|
bool standalone = true;
|
|
/*
|
|
* optimistic allocation without direct reclaim since inplace I/O
|
|
* can be used if low memory otherwise.
|
|
*/
|
|
gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) |
|
|
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
|
|
unsigned int i;
|
|
|
|
if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED)
|
|
return;
|
|
|
|
for (i = 0; i < pcl->pclusterpages; ++i) {
|
|
struct page *page;
|
|
void *t; /* mark pages just found for debugging */
|
|
struct page *newpage = NULL;
|
|
|
|
/* the compressed page was loaded before */
|
|
if (READ_ONCE(pcl->compressed_bvecs[i].page))
|
|
continue;
|
|
|
|
page = find_get_page(mc, pcl->obj.index + i);
|
|
|
|
if (page) {
|
|
t = (void *)((unsigned long)page | 1);
|
|
} else {
|
|
/* I/O is needed, no possible to decompress directly */
|
|
standalone = false;
|
|
if (!shouldalloc)
|
|
continue;
|
|
|
|
/*
|
|
* try to use cached I/O if page allocation
|
|
* succeeds or fallback to in-place I/O instead
|
|
* to avoid any direct reclaim.
|
|
*/
|
|
newpage = erofs_allocpage(&fe->pagepool, gfp);
|
|
if (!newpage)
|
|
continue;
|
|
set_page_private(newpage, Z_EROFS_PREALLOCATED_PAGE);
|
|
t = (void *)((unsigned long)newpage | 1);
|
|
}
|
|
|
|
if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, t))
|
|
continue;
|
|
|
|
if (page)
|
|
put_page(page);
|
|
else if (newpage)
|
|
erofs_pagepool_add(&fe->pagepool, newpage);
|
|
}
|
|
|
|
/*
|
|
* don't do inplace I/O if all compressed pages are available in
|
|
* managed cache since it can be moved to the bypass queue instead.
|
|
*/
|
|
if (standalone)
|
|
fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
|
|
}
|
|
|
|
/* called by erofs_shrinker to get rid of all compressed_pages */
|
|
int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
|
|
struct erofs_workgroup *grp)
|
|
{
|
|
struct z_erofs_pcluster *const pcl =
|
|
container_of(grp, struct z_erofs_pcluster, obj);
|
|
int i;
|
|
|
|
DBG_BUGON(z_erofs_is_inline_pcluster(pcl));
|
|
/*
|
|
* refcount of workgroup is now freezed as 0,
|
|
* therefore no need to worry about available decompression users.
|
|
*/
|
|
for (i = 0; i < pcl->pclusterpages; ++i) {
|
|
struct page *page = pcl->compressed_bvecs[i].page;
|
|
|
|
if (!page)
|
|
continue;
|
|
|
|
/* block other users from reclaiming or migrating the page */
|
|
if (!trylock_page(page))
|
|
return -EBUSY;
|
|
|
|
if (!erofs_page_is_managed(sbi, page))
|
|
continue;
|
|
|
|
/* barrier is implied in the following 'unlock_page' */
|
|
WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);
|
|
detach_page_private(page);
|
|
unlock_page(page);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool z_erofs_cache_release_folio(struct folio *folio, gfp_t gfp)
|
|
{
|
|
struct z_erofs_pcluster *pcl = folio_get_private(folio);
|
|
bool ret;
|
|
int i;
|
|
|
|
if (!folio_test_private(folio))
|
|
return true;
|
|
|
|
ret = false;
|
|
spin_lock(&pcl->obj.lockref.lock);
|
|
if (pcl->obj.lockref.count > 0)
|
|
goto out;
|
|
|
|
DBG_BUGON(z_erofs_is_inline_pcluster(pcl));
|
|
for (i = 0; i < pcl->pclusterpages; ++i) {
|
|
if (pcl->compressed_bvecs[i].page == &folio->page) {
|
|
WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);
|
|
ret = true;
|
|
break;
|
|
}
|
|
}
|
|
if (ret)
|
|
folio_detach_private(folio);
|
|
out:
|
|
spin_unlock(&pcl->obj.lockref.lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* It will be called only on inode eviction. In case that there are still some
|
|
* decompression requests in progress, wait with rescheduling for a bit here.
|
|
* An extra lock could be introduced instead but it seems unnecessary.
|
|
*/
|
|
static void z_erofs_cache_invalidate_folio(struct folio *folio,
|
|
size_t offset, size_t length)
|
|
{
|
|
const size_t stop = length + offset;
|
|
|
|
/* Check for potential overflow in debug mode */
|
|
DBG_BUGON(stop > folio_size(folio) || stop < length);
|
|
|
|
if (offset == 0 && stop == folio_size(folio))
|
|
while (!z_erofs_cache_release_folio(folio, GFP_NOFS))
|
|
cond_resched();
|
|
}
|
|
|
|
static const struct address_space_operations z_erofs_cache_aops = {
|
|
.release_folio = z_erofs_cache_release_folio,
|
|
.invalidate_folio = z_erofs_cache_invalidate_folio,
|
|
};
|
|
|
|
int erofs_init_managed_cache(struct super_block *sb)
|
|
{
|
|
struct inode *const inode = new_inode(sb);
|
|
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
set_nlink(inode, 1);
|
|
inode->i_size = OFFSET_MAX;
|
|
inode->i_mapping->a_ops = &z_erofs_cache_aops;
|
|
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
|
|
EROFS_SB(sb)->managed_cache = inode;
|
|
return 0;
|
|
}
|
|
|
|
static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe,
|
|
struct z_erofs_bvec *bvec)
|
|
{
|
|
struct z_erofs_pcluster *const pcl = fe->pcl;
|
|
|
|
while (fe->icur > 0) {
|
|
if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page,
|
|
NULL, bvec->page)) {
|
|
pcl->compressed_bvecs[fe->icur] = *bvec;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* callers must be with pcluster lock held */
|
|
static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
|
|
struct z_erofs_bvec *bvec, bool exclusive)
|
|
{
|
|
int ret;
|
|
|
|
if (exclusive) {
|
|
/* give priority for inplaceio to use file pages first */
|
|
if (z_erofs_try_inplace_io(fe, bvec))
|
|
return 0;
|
|
/* otherwise, check if it can be used as a bvpage */
|
|
if (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED &&
|
|
!fe->candidate_bvpage)
|
|
fe->candidate_bvpage = bvec->page;
|
|
}
|
|
ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage,
|
|
&fe->pagepool);
|
|
fe->pcl->vcnt += (ret >= 0);
|
|
return ret;
|
|
}
|
|
|
|
static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f)
|
|
{
|
|
struct z_erofs_pcluster *pcl = f->pcl;
|
|
z_erofs_next_pcluster_t *owned_head = &f->owned_head;
|
|
|
|
/* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */
|
|
if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL,
|
|
*owned_head) == Z_EROFS_PCLUSTER_NIL) {
|
|
*owned_head = &pcl->next;
|
|
/* so we can attach this pcluster to our submission chain. */
|
|
f->mode = Z_EROFS_PCLUSTER_FOLLOWED;
|
|
return;
|
|
}
|
|
|
|
/* type 2, it belongs to an ongoing chain */
|
|
f->mode = Z_EROFS_PCLUSTER_INFLIGHT;
|
|
}
|
|
|
|
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) ||
|
|
(!ztailpacking && !(map->m_pa >> PAGE_SHIFT))) {
|
|
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);
|
|
|
|
spin_lock_init(&pcl->obj.lockref.lock);
|
|
pcl->algorithmformat = map->m_algorithmformat;
|
|
pcl->length = 0;
|
|
pcl->partial = true;
|
|
|
|
/* 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(fe->inode->i_sb, 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;
|
|
}
|
|
}
|
|
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_pcluster_begin(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct erofs_map_blocks *map = &fe->map;
|
|
struct super_block *sb = fe->inode->i_sb;
|
|
erofs_blk_t blknr = erofs_blknr(sb, map->m_pa);
|
|
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);
|
|
|
|
if (!(map->m_flags & EROFS_MAP_META)) {
|
|
grp = erofs_find_workgroup(sb, blknr);
|
|
} 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) {
|
|
mutex_lock(&fe->pcl->lock);
|
|
z_erofs_try_to_claim_pcluster(fe);
|
|
} else if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset,
|
|
Z_EROFS_INLINE_BVECS, fe->pcl->vcnt);
|
|
if (!z_erofs_is_inline_pcluster(fe->pcl)) {
|
|
/* bind cache first when cached decompression is preferred */
|
|
z_erofs_bind_cache(fe);
|
|
} else {
|
|
void *mptr;
|
|
|
|
mptr = erofs_read_metabuf(&map->buf, sb, blknr, EROFS_NO_KMAP);
|
|
if (IS_ERR(mptr)) {
|
|
ret = PTR_ERR(mptr);
|
|
erofs_err(sb, "failed to get inline data %d", ret);
|
|
return ret;
|
|
}
|
|
get_page(map->buf.page);
|
|
WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, map->buf.page);
|
|
fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE;
|
|
}
|
|
/* file-backed inplace I/O 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 void z_erofs_pcluster_end(struct z_erofs_decompress_frontend *fe)
|
|
{
|
|
struct z_erofs_pcluster *pcl = fe->pcl;
|
|
|
|
if (!pcl)
|
|
return;
|
|
|
|
z_erofs_bvec_iter_end(&fe->biter);
|
|
mutex_unlock(&pcl->lock);
|
|
|
|
if (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;
|
|
}
|
|
|
|
static int z_erofs_read_fragment(struct super_block *sb, struct page *page,
|
|
unsigned int cur, unsigned int end, erofs_off_t pos)
|
|
{
|
|
struct inode *packed_inode = EROFS_SB(sb)->packed_inode;
|
|
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
|
|
unsigned int cnt;
|
|
u8 *src;
|
|
|
|
if (!packed_inode)
|
|
return -EFSCORRUPTED;
|
|
|
|
buf.inode = packed_inode;
|
|
for (; cur < end; cur += cnt, pos += cnt) {
|
|
cnt = min_t(unsigned int, end - cur,
|
|
sb->s_blocksize - erofs_blkoff(sb, pos));
|
|
src = erofs_bread(&buf, erofs_blknr(sb, pos), EROFS_KMAP);
|
|
if (IS_ERR(src)) {
|
|
erofs_put_metabuf(&buf);
|
|
return PTR_ERR(src);
|
|
}
|
|
memcpy_to_page(page, cur, src + erofs_blkoff(sb, pos), cnt);
|
|
}
|
|
erofs_put_metabuf(&buf);
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
|
|
struct page *page)
|
|
{
|
|
struct inode *const inode = fe->inode;
|
|
struct erofs_map_blocks *const map = &fe->map;
|
|
const loff_t offset = page_offset(page);
|
|
bool tight = true, exclusive;
|
|
unsigned int cur, end, len, split;
|
|
int err = 0;
|
|
|
|
z_erofs_onlinepage_init(page);
|
|
|
|
split = 0;
|
|
end = PAGE_SIZE;
|
|
repeat:
|
|
if (offset + end - 1 < map->m_la ||
|
|
offset + end - 1 >= map->m_la + map->m_llen) {
|
|
z_erofs_pcluster_end(fe);
|
|
map->m_la = offset + end - 1;
|
|
map->m_llen = 0;
|
|
err = z_erofs_map_blocks_iter(inode, map, 0);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
cur = offset > map->m_la ? 0 : map->m_la - offset;
|
|
/* bump split parts first to avoid several separate cases */
|
|
++split;
|
|
|
|
if (!(map->m_flags & EROFS_MAP_MAPPED)) {
|
|
zero_user_segment(page, cur, end);
|
|
tight = false;
|
|
goto next_part;
|
|
}
|
|
|
|
if (map->m_flags & EROFS_MAP_FRAGMENT) {
|
|
erofs_off_t fpos = offset + cur - map->m_la;
|
|
|
|
len = min_t(unsigned int, map->m_llen - fpos, end - cur);
|
|
err = z_erofs_read_fragment(inode->i_sb, page, cur, cur + len,
|
|
EROFS_I(inode)->z_fragmentoff + fpos);
|
|
if (err)
|
|
goto out;
|
|
tight = false;
|
|
goto next_part;
|
|
}
|
|
|
|
if (!fe->pcl) {
|
|
err = z_erofs_pcluster_begin(fe);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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_FOLLOWED_NOINPLACE);
|
|
exclusive = (!cur && ((split <= 1) || tight));
|
|
if (cur)
|
|
tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED);
|
|
|
|
err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) {
|
|
.page = page,
|
|
.offset = offset - map->m_la,
|
|
.end = end,
|
|
}), exclusive);
|
|
if (err)
|
|
goto out;
|
|
|
|
z_erofs_onlinepage_split(page);
|
|
if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK))
|
|
fe->pcl->multibases = true;
|
|
if (fe->pcl->length < offset + end - map->m_la) {
|
|
fe->pcl->length = offset + end - map->m_la;
|
|
fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK;
|
|
}
|
|
if ((map->m_flags & EROFS_MAP_FULL_MAPPED) &&
|
|
!(map->m_flags & EROFS_MAP_PARTIAL_REF) &&
|
|
fe->pcl->length == map->m_llen)
|
|
fe->pcl->partial = false;
|
|
next_part:
|
|
/* shorten the remaining extent to update progress */
|
|
map->m_llen = offset + cur - map->m_la;
|
|
map->m_flags &= ~EROFS_MAP_FULL_MAPPED;
|
|
|
|
end = cur;
|
|
if (end > 0)
|
|
goto repeat;
|
|
|
|
out:
|
|
z_erofs_onlinepage_endio(page, err);
|
|
return err;
|
|
}
|
|
|
|
static bool z_erofs_is_sync_decompress(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 list_head decompressed_secondary_bvecs;
|
|
struct page **pagepool;
|
|
unsigned int onstack_used, nr_pages;
|
|
};
|
|
|
|
struct z_erofs_bvec_item {
|
|
struct z_erofs_bvec bvec;
|
|
struct list_head list;
|
|
};
|
|
|
|
static void z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be,
|
|
struct z_erofs_bvec *bvec)
|
|
{
|
|
struct z_erofs_bvec_item *item;
|
|
unsigned int pgnr;
|
|
|
|
if (!((bvec->offset + be->pcl->pageofs_out) & ~PAGE_MASK) &&
|
|
(bvec->end == PAGE_SIZE ||
|
|
bvec->offset + bvec->end == be->pcl->length)) {
|
|
pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT;
|
|
DBG_BUGON(pgnr >= be->nr_pages);
|
|
if (!be->decompressed_pages[pgnr]) {
|
|
be->decompressed_pages[pgnr] = bvec->page;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* (cold path) one pcluster is requested multiple times */
|
|
item = kmalloc(sizeof(*item), GFP_KERNEL | __GFP_NOFAIL);
|
|
item->bvec = *bvec;
|
|
list_add(&item->list, &be->decompressed_secondary_bvecs);
|
|
}
|
|
|
|
static void z_erofs_fill_other_copies(struct z_erofs_decompress_backend *be,
|
|
int err)
|
|
{
|
|
unsigned int off0 = be->pcl->pageofs_out;
|
|
struct list_head *p, *n;
|
|
|
|
list_for_each_safe(p, n, &be->decompressed_secondary_bvecs) {
|
|
struct z_erofs_bvec_item *bvi;
|
|
unsigned int end, cur;
|
|
void *dst, *src;
|
|
|
|
bvi = container_of(p, struct z_erofs_bvec_item, list);
|
|
cur = bvi->bvec.offset < 0 ? -bvi->bvec.offset : 0;
|
|
end = min_t(unsigned int, be->pcl->length - bvi->bvec.offset,
|
|
bvi->bvec.end);
|
|
dst = kmap_local_page(bvi->bvec.page);
|
|
while (cur < end) {
|
|
unsigned int pgnr, scur, len;
|
|
|
|
pgnr = (bvi->bvec.offset + cur + off0) >> PAGE_SHIFT;
|
|
DBG_BUGON(pgnr >= be->nr_pages);
|
|
|
|
scur = bvi->bvec.offset + cur -
|
|
((pgnr << PAGE_SHIFT) - off0);
|
|
len = min_t(unsigned int, end - cur, PAGE_SIZE - scur);
|
|
if (!be->decompressed_pages[pgnr]) {
|
|
err = -EFSCORRUPTED;
|
|
cur += len;
|
|
continue;
|
|
}
|
|
src = kmap_local_page(be->decompressed_pages[pgnr]);
|
|
memcpy(dst + cur, src + scur, len);
|
|
kunmap_local(src);
|
|
cur += len;
|
|
}
|
|
kunmap_local(dst);
|
|
z_erofs_onlinepage_endio(bvi->bvec.page, err);
|
|
list_del(p);
|
|
kfree(bvi);
|
|
}
|
|
}
|
|
|
|
static void 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;
|
|
|
|
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));
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
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);
|
|
const struct z_erofs_decompressor *decompressor =
|
|
&erofs_decompressors[pcl->algorithmformat];
|
|
unsigned int i, inputsize;
|
|
int err2;
|
|
struct page *page;
|
|
bool overlapped;
|
|
|
|
mutex_lock(&pcl->lock);
|
|
be->nr_pages = PAGE_ALIGN(pcl->length + pcl->pageofs_out) >> PAGE_SHIFT;
|
|
|
|
/* allocate (de)compressed page arrays if cannot be kept on stack */
|
|
be->decompressed_pages = NULL;
|
|
be->compressed_pages = NULL;
|
|
be->onstack_used = 0;
|
|
if (be->nr_pages <= Z_EROFS_ONSTACK_PAGES) {
|
|
be->decompressed_pages = be->onstack_pages;
|
|
be->onstack_used = be->nr_pages;
|
|
memset(be->decompressed_pages, 0,
|
|
sizeof(struct page *) * be->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(be->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);
|
|
|
|
z_erofs_parse_out_bvecs(be);
|
|
err2 = z_erofs_parse_in_bvecs(be, &overlapped);
|
|
if (err2)
|
|
err = err2;
|
|
if (err)
|
|
goto out;
|
|
|
|
if (z_erofs_is_inline_pcluster(pcl))
|
|
inputsize = pcl->tailpacking_size;
|
|
else
|
|
inputsize = pclusterpages * PAGE_SIZE;
|
|
|
|
err = decompressor->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 = pcl->length,
|
|
.alg = pcl->algorithmformat,
|
|
.inplace_io = overlapped,
|
|
.partial_decoding = pcl->partial,
|
|
.fillgaps = pcl->multibases,
|
|
}, 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);
|
|
z_erofs_fill_other_copies(be, err);
|
|
|
|
for (i = 0; i < be->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;
|
|
z_erofs_onlinepage_endio(page, err);
|
|
}
|
|
|
|
if (be->decompressed_pages != be->onstack_pages)
|
|
kvfree(be->decompressed_pages);
|
|
|
|
pcl->length = 0;
|
|
pcl->partial = true;
|
|
pcl->multibases = false;
|
|
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,
|
|
.decompressed_secondary_bvecs =
|
|
LIST_HEAD_INIT(be.decompressed_secondary_bvecs),
|
|
};
|
|
z_erofs_next_pcluster_t owned = io->head;
|
|
|
|
while (owned != Z_EROFS_PCLUSTER_TAIL) {
|
|
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);
|
|
if (z_erofs_is_inline_pcluster(be.pcl))
|
|
z_erofs_free_pcluster(be.pcl);
|
|
else
|
|
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);
|
|
z_erofs_decompress_queue(bgq, &pagepool);
|
|
erofs_release_pages(&pagepool);
|
|
kvfree(bgq);
|
|
}
|
|
|
|
#ifdef CONFIG_EROFS_FS_PCPU_KTHREAD
|
|
static void z_erofs_decompressqueue_kthread_work(struct kthread_work *work)
|
|
{
|
|
z_erofs_decompressqueue_work((struct work_struct *)work);
|
|
}
|
|
#endif
|
|
|
|
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
|
|
int bios)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(io->sb);
|
|
|
|
/* wake up the caller thread for sync decompression */
|
|
if (io->sync) {
|
|
if (!atomic_add_return(bios, &io->pending_bios))
|
|
complete(&io->u.done);
|
|
return;
|
|
}
|
|
|
|
if (atomic_add_return(bios, &io->pending_bios))
|
|
return;
|
|
/* Use (kthread_)work and sync decompression for atomic contexts only */
|
|
if (!in_task() || irqs_disabled() || rcu_read_lock_any_held()) {
|
|
#ifdef CONFIG_EROFS_FS_PCPU_KTHREAD
|
|
struct kthread_worker *worker;
|
|
|
|
rcu_read_lock();
|
|
worker = rcu_dereference(
|
|
z_erofs_pcpu_workers[raw_smp_processor_id()]);
|
|
if (!worker) {
|
|
INIT_WORK(&io->u.work, z_erofs_decompressqueue_work);
|
|
queue_work(z_erofs_workqueue, &io->u.work);
|
|
} else {
|
|
kthread_queue_work(worker, &io->u.kthread_work);
|
|
}
|
|
rcu_read_unlock();
|
|
#else
|
|
queue_work(z_erofs_workqueue, &io->u.work);
|
|
#endif
|
|
/* 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;
|
|
int justfound;
|
|
|
|
repeat:
|
|
page = READ_ONCE(pcl->compressed_bvecs[nr].page);
|
|
oldpage = page;
|
|
|
|
if (!page)
|
|
goto out_allocpage;
|
|
|
|
justfound = (unsigned long)page & 1UL;
|
|
page = (struct page *)((unsigned long)page & ~1UL);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
#ifdef CONFIG_EROFS_FS_PCPU_KTHREAD
|
|
kthread_init_work(&q->u.kthread_work,
|
|
z_erofs_decompressqueue_kthread_work);
|
|
#else
|
|
INIT_WORK(&q->u.work, z_erofs_decompressqueue_work);
|
|
#endif
|
|
} else {
|
|
fg_out:
|
|
q = fgq;
|
|
init_completion(&fgq->u.done);
|
|
atomic_set(&fgq->pending_bios, 0);
|
|
q->eio = false;
|
|
q->sync = true;
|
|
}
|
|
q->sb = sb;
|
|
q->head = Z_EROFS_PCLUSTER_TAIL;
|
|
return q;
|
|
}
|
|
|
|
/* define decompression jobqueue types */
|
|
enum {
|
|
JQ_BYPASS,
|
|
JQ_SUBMIT,
|
|
NR_JOBQUEUES,
|
|
};
|
|
|
|
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];
|
|
|
|
WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL);
|
|
|
|
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)
|
|
{
|
|
struct z_erofs_decompressqueue *q = bio->bi_private;
|
|
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, -1);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f,
|
|
struct z_erofs_decompressqueue *fgq,
|
|
bool *force_fg, bool readahead)
|
|
{
|
|
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];
|
|
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;
|
|
unsigned long pflags;
|
|
int memstall = 0;
|
|
|
|
/*
|
|
* 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, 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;
|
|
|
|
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL);
|
|
pcl = container_of(owned_head, struct z_erofs_pcluster, next);
|
|
owned_head = READ_ONCE(pcl->next);
|
|
|
|
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 = erofs_pos(sb, pcl->obj.index),
|
|
};
|
|
(void)erofs_map_dev(sb, &mdev);
|
|
|
|
cur = erofs_blknr(sb, mdev.m_pa);
|
|
end = cur + pcl->pclusterpages;
|
|
|
|
do {
|
|
struct page *page;
|
|
|
|
page = pickup_page_for_submission(pcl, i++,
|
|
&f->pagepool, mc);
|
|
if (!page)
|
|
continue;
|
|
|
|
if (bio && (cur != last_index + 1 ||
|
|
last_bdev != mdev.m_bdev)) {
|
|
submit_bio_retry:
|
|
submit_bio(bio);
|
|
if (memstall) {
|
|
psi_memstall_leave(&pflags);
|
|
memstall = 0;
|
|
}
|
|
bio = NULL;
|
|
}
|
|
|
|
if (unlikely(PageWorkingset(page)) && !memstall) {
|
|
psi_memstall_enter(&pflags);
|
|
memstall = 1;
|
|
}
|
|
|
|
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 <<
|
|
(sb->s_blocksize_bits - 9);
|
|
bio->bi_private = q[JQ_SUBMIT];
|
|
if (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);
|
|
if (memstall)
|
|
psi_memstall_leave(&pflags);
|
|
}
|
|
|
|
/*
|
|
* although background is preferred, no one is pending for submission.
|
|
* don't issue decompression but drop it directly instead.
|
|
*/
|
|
if (!*force_fg && !nr_bios) {
|
|
kvfree(q[JQ_SUBMIT]);
|
|
return;
|
|
}
|
|
z_erofs_decompress_kickoff(q[JQ_SUBMIT], nr_bios);
|
|
}
|
|
|
|
static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f,
|
|
bool force_fg, bool ra)
|
|
{
|
|
struct z_erofs_decompressqueue io[NR_JOBQUEUES];
|
|
|
|
if (f->owned_head == Z_EROFS_PCLUSTER_TAIL)
|
|
return;
|
|
z_erofs_submit_queue(f, io, &force_fg, ra);
|
|
|
|
/* handle bypass queue (no i/o pclusters) immediately */
|
|
z_erofs_decompress_queue(&io[JQ_BYPASS], &f->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], &f->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, bool backmost)
|
|
{
|
|
struct inode *inode = f->inode;
|
|
struct erofs_map_blocks *map = &f->map;
|
|
erofs_off_t cur, end, headoffset = f->headoffset;
|
|
int err;
|
|
|
|
if (backmost) {
|
|
if (rac)
|
|
end = headoffset + readahead_length(rac) - 1;
|
|
else
|
|
end = headoffset + PAGE_SIZE - 1;
|
|
map->m_la = end;
|
|
err = z_erofs_map_blocks_iter(inode, map,
|
|
EROFS_GET_BLOCKS_READMORE);
|
|
if (err)
|
|
return;
|
|
|
|
/* expand ra for the trailing edge if readahead */
|
|
if (rac) {
|
|
cur = round_up(map->m_la + map->m_llen, PAGE_SIZE);
|
|
readahead_expand(rac, headoffset, cur - headoffset);
|
|
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) && (cur < i_size_read(inode))) {
|
|
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
|
|
(void)z_erofs_do_read_page(f, page);
|
|
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 inode *const inode = folio->mapping->host;
|
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
|
|
int err;
|
|
|
|
trace_erofs_read_folio(folio, false);
|
|
f.headoffset = (erofs_off_t)folio->index << PAGE_SHIFT;
|
|
|
|
z_erofs_pcluster_readmore(&f, NULL, true);
|
|
err = z_erofs_do_read_page(&f, &folio->page);
|
|
z_erofs_pcluster_readmore(&f, NULL, false);
|
|
z_erofs_pcluster_end(&f);
|
|
|
|
/* if some compressed cluster ready, need submit them anyway */
|
|
z_erofs_runqueue(&f, z_erofs_is_sync_decompress(sbi, 0), false);
|
|
|
|
if (err && err != -EINTR)
|
|
erofs_err(inode->i_sb, "read error %d @ %lu of nid %llu",
|
|
err, folio->index, EROFS_I(inode)->nid);
|
|
|
|
erofs_put_metabuf(&f.map.buf);
|
|
erofs_release_pages(&f.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 folio *head = NULL, *folio;
|
|
unsigned int nr_folios;
|
|
int err;
|
|
|
|
f.headoffset = readahead_pos(rac);
|
|
|
|
z_erofs_pcluster_readmore(&f, rac, true);
|
|
nr_folios = readahead_count(rac);
|
|
trace_erofs_readpages(inode, readahead_index(rac), nr_folios, false);
|
|
|
|
while ((folio = readahead_folio(rac))) {
|
|
folio->private = head;
|
|
head = folio;
|
|
}
|
|
|
|
/* traverse in reverse order for best metadata I/O performance */
|
|
while (head) {
|
|
folio = head;
|
|
head = folio_get_private(folio);
|
|
|
|
err = z_erofs_do_read_page(&f, &folio->page);
|
|
if (err && err != -EINTR)
|
|
erofs_err(inode->i_sb, "readahead error at folio %lu @ nid %llu",
|
|
folio->index, EROFS_I(inode)->nid);
|
|
}
|
|
z_erofs_pcluster_readmore(&f, rac, false);
|
|
z_erofs_pcluster_end(&f);
|
|
|
|
z_erofs_runqueue(&f, z_erofs_is_sync_decompress(sbi, nr_folios), true);
|
|
erofs_put_metabuf(&f.map.buf);
|
|
erofs_release_pages(&f.pagepool);
|
|
}
|
|
|
|
const struct address_space_operations z_erofs_aops = {
|
|
.read_folio = z_erofs_read_folio,
|
|
.readahead = z_erofs_readahead,
|
|
};
|