191 lines
4.7 KiB
C
191 lines
4.7 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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#ifndef __EROFS_FS_ZDATA_H
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#define __EROFS_FS_ZDATA_H
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#include "internal.h"
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#include "zpvec.h"
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#define Z_EROFS_NR_INLINE_PAGEVECS 3
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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 pageset 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_collection {
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struct mutex lock;
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/* I: page offset of start position of decompression */
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unsigned short pageofs;
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/* L: maximum relative page index in pagevec[] */
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unsigned short nr_pages;
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/* L: total number of pages in pagevec[] */
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unsigned int vcnt;
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union {
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/* L: inline a certain number of pagevecs for bootstrap */
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erofs_vtptr_t pagevec[Z_EROFS_NR_INLINE_PAGEVECS];
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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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};
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#define Z_EROFS_PCLUSTER_FULL_LENGTH 0x00000001
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#define Z_EROFS_PCLUSTER_LENGTH_BIT 1
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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_pcluster {
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struct erofs_workgroup obj;
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struct z_erofs_collection primary_collection;
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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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/* A: compressed pages (including multi-usage pages) */
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struct page *compressed_pages[Z_EROFS_CLUSTER_MAX_PAGES];
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/* A: lower limit of decompressed length and if full length or not */
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unsigned int length;
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/* I: compression algorithm format */
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unsigned char algorithmformat;
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/* I: bit shift of physical cluster size */
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unsigned char clusterbits;
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};
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#define z_erofs_primarycollection(pcluster) (&(pcluster)->primary_collection)
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/* let's avoid the valid 32-bit kernel addresses */
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/* the chained workgroup has't submitted io (still open) */
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#define Z_EROFS_PCLUSTER_TAIL ((void *)0x5F0ECAFE)
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/* the chained workgroup has already submitted io */
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#define Z_EROFS_PCLUSTER_TAIL_CLOSED ((void *)0x5F0EDEAD)
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#define Z_EROFS_PCLUSTER_NIL (NULL)
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#define Z_EROFS_WORKGROUP_SIZE sizeof(struct z_erofs_pcluster)
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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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wait_queue_head_t wait;
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struct work_struct work;
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} u;
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};
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#define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
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static inline bool erofs_page_is_managed(const struct erofs_sb_info *sbi,
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struct page *page)
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{
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return page->mapping == MNGD_MAPPING(sbi);
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}
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#define Z_EROFS_ONLINEPAGE_COUNT_BITS 2
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#define Z_EROFS_ONLINEPAGE_COUNT_MASK ((1 << Z_EROFS_ONLINEPAGE_COUNT_BITS) - 1)
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#define Z_EROFS_ONLINEPAGE_INDEX_SHIFT (Z_EROFS_ONLINEPAGE_COUNT_BITS)
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/*
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* waiters (aka. ongoing_packs): # to unlock the page
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* sub-index: 0 - for partial page, >= 1 full page sub-index
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*/
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typedef atomic_t z_erofs_onlinepage_t;
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/* type punning */
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union z_erofs_onlinepage_converter {
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z_erofs_onlinepage_t *o;
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unsigned long *v;
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};
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static inline unsigned int z_erofs_onlinepage_index(struct page *page)
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{
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union z_erofs_onlinepage_converter u;
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DBG_BUGON(!PagePrivate(page));
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u.v = &page_private(page);
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return atomic_read(u.o) >> Z_EROFS_ONLINEPAGE_INDEX_SHIFT;
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}
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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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z_erofs_onlinepage_t o;
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unsigned long v;
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/* keep from being unlocked in advance */
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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_fixup(struct page *page,
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uintptr_t index, bool down)
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{
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union z_erofs_onlinepage_converter u = { .v = &page_private(page) };
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int orig, orig_index, val;
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repeat:
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orig = atomic_read(u.o);
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orig_index = orig >> Z_EROFS_ONLINEPAGE_INDEX_SHIFT;
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if (orig_index) {
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if (!index)
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return;
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DBG_BUGON(orig_index != index);
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}
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val = (index << Z_EROFS_ONLINEPAGE_INDEX_SHIFT) |
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((orig & Z_EROFS_ONLINEPAGE_COUNT_MASK) + (unsigned int)down);
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if (atomic_cmpxchg(u.o, orig, val) != orig)
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goto repeat;
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}
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static inline void z_erofs_onlinepage_endio(struct page *page)
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{
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union z_erofs_onlinepage_converter u;
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unsigned int v;
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DBG_BUGON(!PagePrivate(page));
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u.v = &page_private(page);
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v = atomic_dec_return(u.o);
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if (!(v & Z_EROFS_ONLINEPAGE_COUNT_MASK)) {
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set_page_private(page, 0);
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ClearPagePrivate(page);
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if (!PageError(page))
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SetPageUptodate(page);
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unlock_page(page);
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}
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erofs_dbg("%s, page %p value %x", __func__, page, atomic_read(u.o));
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}
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#define Z_EROFS_VMAP_ONSTACK_PAGES \
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min_t(unsigned int, THREAD_SIZE / 8 / sizeof(struct page *), 96U)
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#define Z_EROFS_VMAP_GLOBAL_PAGES 2048
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#endif
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