// SPDX-License-Identifier: GPL-2.0
|
/*
|
* linux/drivers/staging/erofs/unzip_vle.c
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*
|
* Copyright (C) 2018 HUAWEI, Inc.
|
* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*
|
* This file is subject to the terms and conditions of the GNU General Public
|
* License. See the file COPYING in the main directory of the Linux
|
* distribution for more details.
|
*/
|
#include "unzip_vle.h"
|
#include <linux/prefetch.h>
|
|
static struct workqueue_struct *z_erofs_workqueue __read_mostly;
|
static struct kmem_cache *z_erofs_workgroup_cachep __read_mostly;
|
|
void z_erofs_exit_zip_subsystem(void)
|
{
|
destroy_workqueue(z_erofs_workqueue);
|
kmem_cache_destroy(z_erofs_workgroup_cachep);
|
}
|
|
static inline int init_unzip_workqueue(void)
|
{
|
const unsigned onlinecpus = num_possible_cpus();
|
|
/*
|
* we don't need too many threads, limiting threads
|
* could improve scheduling performance.
|
*/
|
z_erofs_workqueue = alloc_workqueue("erofs_unzipd",
|
WQ_UNBOUND | WQ_HIGHPRI | WQ_CPU_INTENSIVE,
|
onlinecpus + onlinecpus / 4);
|
|
return z_erofs_workqueue != NULL ? 0 : -ENOMEM;
|
}
|
|
int z_erofs_init_zip_subsystem(void)
|
{
|
z_erofs_workgroup_cachep =
|
kmem_cache_create("erofs_compress",
|
Z_EROFS_WORKGROUP_SIZE, 0,
|
SLAB_RECLAIM_ACCOUNT, NULL);
|
|
if (z_erofs_workgroup_cachep != NULL) {
|
if (!init_unzip_workqueue())
|
return 0;
|
|
kmem_cache_destroy(z_erofs_workgroup_cachep);
|
}
|
return -ENOMEM;
|
}
|
|
enum z_erofs_vle_work_role {
|
Z_EROFS_VLE_WORK_SECONDARY,
|
Z_EROFS_VLE_WORK_PRIMARY,
|
/*
|
* The current work was the tail of an exist chain, and the previous
|
* processed chained works are all decided to be hooked up to it.
|
* A new chain should be created for the remaining unprocessed works,
|
* therefore different from Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED,
|
* the next work cannot reuse the whole page in the following scenario:
|
* ________________________________________________________________
|
* | tail (partial) page | head (partial) page |
|
* | (belongs to the next work) | (belongs to the current work) |
|
* |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________|
|
*/
|
Z_EROFS_VLE_WORK_PRIMARY_HOOKED,
|
/*
|
* The current work has been linked with the processed chained works,
|
* and could be also linked with the potential remaining works, which
|
* means if the processing page is the tail partial page of the work,
|
* the current work can safely use the whole page (since the next work
|
* is under control) for in-place decompression, as illustrated below:
|
* ________________________________________________________________
|
* | tail (partial) page | head (partial) page |
|
* | (of the current work) | (of the previous work) |
|
* | PRIMARY_FOLLOWED or | |
|
* |_____PRIMARY_HOOKED____|____________PRIMARY_FOLLOWED____________|
|
*
|
* [ (*) the above page can be used for the current work itself. ]
|
*/
|
Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED,
|
Z_EROFS_VLE_WORK_MAX
|
};
|
|
struct z_erofs_vle_work_builder {
|
enum z_erofs_vle_work_role role;
|
/*
|
* 'hosted = false' means that the current workgroup doesn't belong to
|
* the owned chained workgroups. In the other words, it is none of our
|
* business to submit this workgroup.
|
*/
|
bool hosted;
|
|
struct z_erofs_vle_workgroup *grp;
|
struct z_erofs_vle_work *work;
|
struct z_erofs_pagevec_ctor vector;
|
|
/* pages used for reading the compressed data */
|
struct page **compressed_pages;
|
unsigned compressed_deficit;
|
};
|
|
#define VLE_WORK_BUILDER_INIT() \
|
{ .work = NULL, .role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED }
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
|
static bool grab_managed_cache_pages(struct address_space *mapping,
|
erofs_blk_t start,
|
struct page **compressed_pages,
|
int clusterblks,
|
bool reserve_allocation)
|
{
|
bool noio = true;
|
unsigned int i;
|
|
/* TODO: optimize by introducing find_get_pages_range */
|
for (i = 0; i < clusterblks; ++i) {
|
struct page *page, *found;
|
|
if (READ_ONCE(compressed_pages[i]) != NULL)
|
continue;
|
|
page = found = find_get_page(mapping, start + i);
|
if (found == NULL) {
|
noio = false;
|
if (!reserve_allocation)
|
continue;
|
page = EROFS_UNALLOCATED_CACHED_PAGE;
|
}
|
|
if (NULL == cmpxchg(compressed_pages + i, NULL, page))
|
continue;
|
|
if (found != NULL)
|
put_page(found);
|
}
|
return noio;
|
}
|
|
/* 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 *egrp)
|
{
|
struct z_erofs_vle_workgroup *const grp =
|
container_of(egrp, struct z_erofs_vle_workgroup, obj);
|
struct address_space *const mapping = sbi->managed_cache->i_mapping;
|
const int clusterpages = erofs_clusterpages(sbi);
|
int i;
|
|
/*
|
* refcount of workgroup is now freezed as 1,
|
* therefore no need to worry about available decompression users.
|
*/
|
for (i = 0; i < clusterpages; ++i) {
|
struct page *page = grp->compressed_pages[i];
|
|
if (page == NULL || page->mapping != mapping)
|
continue;
|
|
/* block other users from reclaiming or migrating the page */
|
if (!trylock_page(page))
|
return -EBUSY;
|
|
/* barrier is implied in the following 'unlock_page' */
|
WRITE_ONCE(grp->compressed_pages[i], NULL);
|
|
set_page_private(page, 0);
|
ClearPagePrivate(page);
|
|
unlock_page(page);
|
put_page(page);
|
}
|
return 0;
|
}
|
|
int erofs_try_to_free_cached_page(struct address_space *mapping,
|
struct page *page)
|
{
|
struct erofs_sb_info *const sbi = EROFS_SB(mapping->host->i_sb);
|
const unsigned int clusterpages = erofs_clusterpages(sbi);
|
|
struct z_erofs_vle_workgroup *grp;
|
int ret = 0; /* 0 - busy */
|
|
/* prevent the workgroup from being freed */
|
rcu_read_lock();
|
grp = (void *)page_private(page);
|
|
if (erofs_workgroup_try_to_freeze(&grp->obj, 1)) {
|
unsigned int i;
|
|
for (i = 0; i < clusterpages; ++i) {
|
if (grp->compressed_pages[i] == page) {
|
WRITE_ONCE(grp->compressed_pages[i], NULL);
|
ret = 1;
|
break;
|
}
|
}
|
erofs_workgroup_unfreeze(&grp->obj, 1);
|
}
|
rcu_read_unlock();
|
|
if (ret) {
|
ClearPagePrivate(page);
|
put_page(page);
|
}
|
return ret;
|
}
|
#endif
|
|
/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */
|
static inline bool try_to_reuse_as_compressed_page(
|
struct z_erofs_vle_work_builder *b,
|
struct page *page)
|
{
|
while (b->compressed_deficit) {
|
--b->compressed_deficit;
|
if (NULL == cmpxchg(b->compressed_pages++, NULL, page))
|
return true;
|
}
|
|
return false;
|
}
|
|
/* callers must be with work->lock held */
|
static int z_erofs_vle_work_add_page(struct z_erofs_vle_work_builder *builder,
|
struct page *page,
|
enum z_erofs_page_type type,
|
bool pvec_safereuse)
|
{
|
int ret;
|
|
/* give priority for the compressed data storage */
|
if (builder->role >= Z_EROFS_VLE_WORK_PRIMARY &&
|
type == Z_EROFS_PAGE_TYPE_EXCLUSIVE &&
|
try_to_reuse_as_compressed_page(builder, page))
|
return 0;
|
|
ret = z_erofs_pagevec_ctor_enqueue(&builder->vector, page, type,
|
pvec_safereuse);
|
builder->work->vcnt += (unsigned)ret;
|
return ret ? 0 : -EAGAIN;
|
}
|
|
static enum z_erofs_vle_work_role
|
try_to_claim_workgroup(struct z_erofs_vle_workgroup *grp,
|
z_erofs_vle_owned_workgrp_t *owned_head,
|
bool *hosted)
|
{
|
DBG_BUGON(*hosted == true);
|
|
/* let's claim these following types of workgroup */
|
retry:
|
if (grp->next == Z_EROFS_VLE_WORKGRP_NIL) {
|
/* type 1, nil workgroup */
|
if (Z_EROFS_VLE_WORKGRP_NIL != cmpxchg(&grp->next,
|
Z_EROFS_VLE_WORKGRP_NIL, *owned_head))
|
goto retry;
|
|
*owned_head = grp;
|
*hosted = true;
|
/* lucky, I am the followee :) */
|
return Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
|
|
} else if (grp->next == Z_EROFS_VLE_WORKGRP_TAIL) {
|
/*
|
* type 2, link to the end of a existing open chain,
|
* be careful that its submission itself is governed
|
* by the original owned chain.
|
*/
|
if (Z_EROFS_VLE_WORKGRP_TAIL != cmpxchg(&grp->next,
|
Z_EROFS_VLE_WORKGRP_TAIL, *owned_head))
|
goto retry;
|
*owned_head = Z_EROFS_VLE_WORKGRP_TAIL;
|
return Z_EROFS_VLE_WORK_PRIMARY_HOOKED;
|
}
|
|
return Z_EROFS_VLE_WORK_PRIMARY; /* :( better luck next time */
|
}
|
|
static struct z_erofs_vle_work *
|
z_erofs_vle_work_lookup(struct super_block *sb,
|
pgoff_t idx, unsigned pageofs,
|
struct z_erofs_vle_workgroup **grp_ret,
|
enum z_erofs_vle_work_role *role,
|
z_erofs_vle_owned_workgrp_t *owned_head,
|
bool *hosted)
|
{
|
bool tag, primary;
|
struct erofs_workgroup *egrp;
|
struct z_erofs_vle_workgroup *grp;
|
struct z_erofs_vle_work *work;
|
|
egrp = erofs_find_workgroup(sb, idx, &tag);
|
if (egrp == NULL) {
|
*grp_ret = NULL;
|
return NULL;
|
}
|
|
*grp_ret = grp = container_of(egrp,
|
struct z_erofs_vle_workgroup, obj);
|
|
work = z_erofs_vle_grab_work(grp, pageofs);
|
/* if multiref is disabled, `primary' is always true */
|
primary = true;
|
|
if (work->pageofs != pageofs) {
|
DBG_BUGON(1);
|
erofs_workgroup_put(egrp);
|
return ERR_PTR(-EIO);
|
}
|
|
/*
|
* lock must be taken first to avoid grp->next == NIL between
|
* claiming workgroup and adding pages:
|
* grp->next != NIL
|
* grp->next = NIL
|
* mutex_unlock_all
|
* mutex_lock(&work->lock)
|
* add all pages to pagevec
|
*
|
* [correct locking case 1]:
|
* mutex_lock(grp->work[a])
|
* ...
|
* mutex_lock(grp->work[b]) mutex_lock(grp->work[c])
|
* ... *role = SECONDARY
|
* add all pages to pagevec
|
* ...
|
* mutex_unlock(grp->work[c])
|
* mutex_lock(grp->work[c])
|
* ...
|
* grp->next = NIL
|
* mutex_unlock_all
|
*
|
* [correct locking case 2]:
|
* mutex_lock(grp->work[b])
|
* ...
|
* mutex_lock(grp->work[a])
|
* ...
|
* mutex_lock(grp->work[c])
|
* ...
|
* grp->next = NIL
|
* mutex_unlock_all
|
* mutex_lock(grp->work[a])
|
* *role = PRIMARY_OWNER
|
* add all pages to pagevec
|
* ...
|
*/
|
mutex_lock(&work->lock);
|
|
*hosted = false;
|
if (!primary)
|
*role = Z_EROFS_VLE_WORK_SECONDARY;
|
else /* claim the workgroup if possible */
|
*role = try_to_claim_workgroup(grp, owned_head, hosted);
|
return work;
|
}
|
|
static struct z_erofs_vle_work *
|
z_erofs_vle_work_register(struct super_block *sb,
|
struct z_erofs_vle_workgroup **grp_ret,
|
struct erofs_map_blocks *map,
|
pgoff_t index, unsigned pageofs,
|
enum z_erofs_vle_work_role *role,
|
z_erofs_vle_owned_workgrp_t *owned_head,
|
bool *hosted)
|
{
|
bool newgrp = false;
|
struct z_erofs_vle_workgroup *grp = *grp_ret;
|
struct z_erofs_vle_work *work;
|
|
/* if multiref is disabled, grp should never be nullptr */
|
if (unlikely(grp)) {
|
DBG_BUGON(1);
|
return ERR_PTR(-EINVAL);
|
}
|
|
/* no available workgroup, let's allocate one */
|
grp = kmem_cache_zalloc(z_erofs_workgroup_cachep, GFP_NOFS);
|
if (unlikely(grp == NULL))
|
return ERR_PTR(-ENOMEM);
|
|
grp->obj.index = index;
|
grp->llen = map->m_llen;
|
|
z_erofs_vle_set_workgrp_fmt(grp,
|
(map->m_flags & EROFS_MAP_ZIPPED) ?
|
Z_EROFS_VLE_WORKGRP_FMT_LZ4 :
|
Z_EROFS_VLE_WORKGRP_FMT_PLAIN);
|
atomic_set(&grp->obj.refcount, 1);
|
|
/* new workgrps have been claimed as type 1 */
|
WRITE_ONCE(grp->next, *owned_head);
|
/* primary and followed work for all new workgrps */
|
*role = Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED;
|
/* it should be submitted by ourselves */
|
*hosted = true;
|
|
newgrp = true;
|
work = z_erofs_vle_grab_primary_work(grp);
|
work->pageofs = pageofs;
|
|
mutex_init(&work->lock);
|
|
if (newgrp) {
|
int err = erofs_register_workgroup(sb, &grp->obj, 0);
|
|
if (err) {
|
kmem_cache_free(z_erofs_workgroup_cachep, grp);
|
return ERR_PTR(-EAGAIN);
|
}
|
}
|
|
*owned_head = *grp_ret = grp;
|
|
mutex_lock(&work->lock);
|
return work;
|
}
|
|
static inline void __update_workgrp_llen(struct z_erofs_vle_workgroup *grp,
|
unsigned int llen)
|
{
|
while (1) {
|
unsigned int orig_llen = grp->llen;
|
|
if (orig_llen >= llen || orig_llen ==
|
cmpxchg(&grp->llen, orig_llen, llen))
|
break;
|
}
|
}
|
|
#define builder_is_hooked(builder) \
|
((builder)->role >= Z_EROFS_VLE_WORK_PRIMARY_HOOKED)
|
|
#define builder_is_followed(builder) \
|
((builder)->role >= Z_EROFS_VLE_WORK_PRIMARY_FOLLOWED)
|
|
static int z_erofs_vle_work_iter_begin(struct z_erofs_vle_work_builder *builder,
|
struct super_block *sb,
|
struct erofs_map_blocks *map,
|
z_erofs_vle_owned_workgrp_t *owned_head)
|
{
|
const unsigned clusterpages = erofs_clusterpages(EROFS_SB(sb));
|
const erofs_blk_t index = erofs_blknr(map->m_pa);
|
const unsigned pageofs = map->m_la & ~PAGE_MASK;
|
struct z_erofs_vle_workgroup *grp;
|
struct z_erofs_vle_work *work;
|
|
DBG_BUGON(builder->work != NULL);
|
|
/* must be Z_EROFS_WORK_TAIL or the next chained work */
|
DBG_BUGON(*owned_head == Z_EROFS_VLE_WORKGRP_NIL);
|
DBG_BUGON(*owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
DBG_BUGON(erofs_blkoff(map->m_pa));
|
|
repeat:
|
work = z_erofs_vle_work_lookup(sb, index,
|
pageofs, &grp, &builder->role, owned_head, &builder->hosted);
|
if (work != NULL) {
|
__update_workgrp_llen(grp, map->m_llen);
|
goto got_it;
|
}
|
|
work = z_erofs_vle_work_register(sb, &grp, map, index, pageofs,
|
&builder->role, owned_head, &builder->hosted);
|
|
if (unlikely(work == ERR_PTR(-EAGAIN)))
|
goto repeat;
|
|
if (unlikely(IS_ERR(work)))
|
return PTR_ERR(work);
|
got_it:
|
z_erofs_pagevec_ctor_init(&builder->vector,
|
Z_EROFS_VLE_INLINE_PAGEVECS, work->pagevec, work->vcnt);
|
|
if (builder->role >= Z_EROFS_VLE_WORK_PRIMARY) {
|
/* enable possibly in-place decompression */
|
builder->compressed_pages = grp->compressed_pages;
|
builder->compressed_deficit = clusterpages;
|
} else {
|
builder->compressed_pages = NULL;
|
builder->compressed_deficit = 0;
|
}
|
|
builder->grp = grp;
|
builder->work = work;
|
return 0;
|
}
|
|
/*
|
* keep in mind that no referenced workgroups will be freed
|
* only after a RCU grace period, so rcu_read_lock() could
|
* prevent a workgroup from being freed.
|
*/
|
static void z_erofs_rcu_callback(struct rcu_head *head)
|
{
|
struct z_erofs_vle_work *work = container_of(head,
|
struct z_erofs_vle_work, rcu);
|
struct z_erofs_vle_workgroup *grp =
|
z_erofs_vle_work_workgroup(work, true);
|
|
kmem_cache_free(z_erofs_workgroup_cachep, grp);
|
}
|
|
void erofs_workgroup_free_rcu(struct erofs_workgroup *grp)
|
{
|
struct z_erofs_vle_workgroup *const vgrp = container_of(grp,
|
struct z_erofs_vle_workgroup, obj);
|
struct z_erofs_vle_work *const work = &vgrp->work;
|
|
call_rcu(&work->rcu, z_erofs_rcu_callback);
|
}
|
|
static void __z_erofs_vle_work_release(struct z_erofs_vle_workgroup *grp,
|
struct z_erofs_vle_work *work __maybe_unused)
|
{
|
erofs_workgroup_put(&grp->obj);
|
}
|
|
void z_erofs_vle_work_release(struct z_erofs_vle_work *work)
|
{
|
struct z_erofs_vle_workgroup *grp =
|
z_erofs_vle_work_workgroup(work, true);
|
|
__z_erofs_vle_work_release(grp, work);
|
}
|
|
static inline bool
|
z_erofs_vle_work_iter_end(struct z_erofs_vle_work_builder *builder)
|
{
|
struct z_erofs_vle_work *work = builder->work;
|
|
if (work == NULL)
|
return false;
|
|
z_erofs_pagevec_ctor_exit(&builder->vector, false);
|
mutex_unlock(&work->lock);
|
|
/*
|
* if all pending pages are added, don't hold work reference
|
* any longer if the current work isn't hosted by ourselves.
|
*/
|
if (!builder->hosted)
|
__z_erofs_vle_work_release(builder->grp, work);
|
|
builder->work = NULL;
|
builder->grp = NULL;
|
return true;
|
}
|
|
static inline struct page *__stagingpage_alloc(struct list_head *pagepool,
|
gfp_t gfp)
|
{
|
struct page *page = erofs_allocpage(pagepool, gfp);
|
|
if (unlikely(page == NULL))
|
return NULL;
|
|
page->mapping = Z_EROFS_MAPPING_STAGING;
|
return page;
|
}
|
|
struct z_erofs_vle_frontend {
|
struct inode *const inode;
|
|
struct z_erofs_vle_work_builder builder;
|
struct erofs_map_blocks_iter m_iter;
|
|
z_erofs_vle_owned_workgrp_t owned_head;
|
|
bool initial;
|
#if (EROFS_FS_ZIP_CACHE_LVL >= 2)
|
erofs_off_t cachedzone_la;
|
#endif
|
};
|
|
#define VLE_FRONTEND_INIT(__i) { \
|
.inode = __i, \
|
.m_iter = { \
|
{ .m_llen = 0, .m_plen = 0 }, \
|
.mpage = NULL \
|
}, \
|
.builder = VLE_WORK_BUILDER_INIT(), \
|
.owned_head = Z_EROFS_VLE_WORKGRP_TAIL, \
|
.initial = true, }
|
|
static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
|
struct page *page,
|
struct list_head *page_pool)
|
{
|
struct super_block *const sb = fe->inode->i_sb;
|
struct erofs_sb_info *const sbi __maybe_unused = EROFS_SB(sb);
|
struct erofs_map_blocks_iter *const m = &fe->m_iter;
|
struct erofs_map_blocks *const map = &m->map;
|
struct z_erofs_vle_work_builder *const builder = &fe->builder;
|
const loff_t offset = page_offset(page);
|
|
bool tight = builder_is_hooked(builder);
|
struct z_erofs_vle_work *work = builder->work;
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
struct address_space *const mngda = sbi->managed_cache->i_mapping;
|
struct z_erofs_vle_workgroup *grp;
|
bool noio_outoforder;
|
#endif
|
|
enum z_erofs_page_type page_type;
|
unsigned cur, end, spiltted, index;
|
int err = 0;
|
|
/* register locked file pages as online pages in pack */
|
z_erofs_onlinepage_init(page);
|
|
spiltted = 0;
|
end = PAGE_SIZE;
|
repeat:
|
cur = end - 1;
|
|
/* lucky, within the range of the current map_blocks */
|
if (offset + cur >= map->m_la &&
|
offset + cur < map->m_la + map->m_llen) {
|
/* didn't get a valid unzip work previously (very rare) */
|
if (!builder->work)
|
goto restart_now;
|
goto hitted;
|
}
|
|
/* go ahead the next map_blocks */
|
debugln("%s: [out-of-range] pos %llu", __func__, offset + cur);
|
|
if (z_erofs_vle_work_iter_end(builder))
|
fe->initial = false;
|
|
map->m_la = offset + cur;
|
map->m_llen = 0;
|
err = erofs_map_blocks_iter(fe->inode, map, &m->mpage, 0);
|
if (unlikely(err))
|
goto err_out;
|
|
restart_now:
|
if (unlikely(!(map->m_flags & EROFS_MAP_MAPPED)))
|
goto hitted;
|
|
DBG_BUGON(map->m_plen != 1 << sbi->clusterbits);
|
DBG_BUGON(erofs_blkoff(map->m_pa));
|
|
err = z_erofs_vle_work_iter_begin(builder, sb, map, &fe->owned_head);
|
if (unlikely(err))
|
goto err_out;
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
grp = fe->builder.grp;
|
|
/* let's do out-of-order decompression for noio */
|
noio_outoforder = grab_managed_cache_pages(mngda,
|
erofs_blknr(map->m_pa),
|
grp->compressed_pages, erofs_blknr(map->m_plen),
|
/* compressed page caching selection strategy */
|
fe->initial | (EROFS_FS_ZIP_CACHE_LVL >= 2 ?
|
map->m_la < fe->cachedzone_la : 0));
|
|
if (noio_outoforder && builder_is_followed(builder))
|
builder->role = Z_EROFS_VLE_WORK_PRIMARY;
|
#endif
|
|
tight &= builder_is_hooked(builder);
|
work = builder->work;
|
hitted:
|
cur = end - min_t(unsigned, offset + end - map->m_la, end);
|
if (unlikely(!(map->m_flags & EROFS_MAP_MAPPED))) {
|
zero_user_segment(page, cur, end);
|
goto next_part;
|
}
|
|
/* let's derive page type */
|
page_type = cur ? Z_EROFS_VLE_PAGE_TYPE_HEAD :
|
(!spiltted ? Z_EROFS_PAGE_TYPE_EXCLUSIVE :
|
(tight ? Z_EROFS_PAGE_TYPE_EXCLUSIVE :
|
Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED));
|
|
if (cur)
|
tight &= builder_is_followed(builder);
|
|
retry:
|
err = z_erofs_vle_work_add_page(builder, page, page_type,
|
builder_is_followed(builder));
|
/* should allocate an additional staging page for pagevec */
|
if (err == -EAGAIN) {
|
struct page *const newpage =
|
__stagingpage_alloc(page_pool, GFP_NOFS);
|
|
err = z_erofs_vle_work_add_page(builder,
|
newpage, Z_EROFS_PAGE_TYPE_EXCLUSIVE, true);
|
if (likely(!err))
|
goto retry;
|
}
|
|
if (unlikely(err))
|
goto err_out;
|
|
index = page->index - map->m_la / PAGE_SIZE;
|
|
/* FIXME! avoid the last relundant fixup & endio */
|
z_erofs_onlinepage_fixup(page, index, true);
|
|
/* bump up the number of spiltted parts of a page */
|
++spiltted;
|
/* also update nr_pages */
|
work->nr_pages = max_t(pgoff_t, work->nr_pages, index + 1);
|
next_part:
|
/* can be used for verification */
|
map->m_llen = offset + cur - map->m_la;
|
|
end = cur;
|
if (end > 0)
|
goto repeat;
|
|
out:
|
/* FIXME! avoid the last relundant fixup & endio */
|
z_erofs_onlinepage_endio(page);
|
|
debugln("%s, finish page: %pK spiltted: %u map->m_llen %llu",
|
__func__, page, spiltted, map->m_llen);
|
return err;
|
|
/* if some error occurred while processing this page */
|
err_out:
|
SetPageError(page);
|
goto out;
|
}
|
|
static void z_erofs_vle_unzip_kickoff(void *ptr, int bios)
|
{
|
tagptr1_t t = tagptr_init(tagptr1_t, ptr);
|
struct z_erofs_vle_unzip_io *io = tagptr_unfold_ptr(t);
|
bool background = tagptr_unfold_tags(t);
|
|
if (!background) {
|
unsigned long flags;
|
|
spin_lock_irqsave(&io->u.wait.lock, flags);
|
if (!atomic_add_return(bios, &io->pending_bios))
|
wake_up_locked(&io->u.wait);
|
spin_unlock_irqrestore(&io->u.wait.lock, flags);
|
return;
|
}
|
|
if (!atomic_add_return(bios, &io->pending_bios))
|
queue_work(z_erofs_workqueue, &io->u.work);
|
}
|
|
static inline void z_erofs_vle_read_endio(struct bio *bio)
|
{
|
const blk_status_t err = bio->bi_status;
|
unsigned i;
|
struct bio_vec *bvec;
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
struct address_space *mngda = NULL;
|
#endif
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
struct page *page = bvec->bv_page;
|
bool cachemngd = false;
|
|
DBG_BUGON(PageUptodate(page));
|
DBG_BUGON(!page->mapping);
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
if (unlikely(mngda == NULL && !z_erofs_is_stagingpage(page))) {
|
struct inode *const inode = page->mapping->host;
|
struct super_block *const sb = inode->i_sb;
|
|
mngda = EROFS_SB(sb)->managed_cache->i_mapping;
|
}
|
|
/*
|
* If mngda has not gotten, it equals NULL,
|
* however, page->mapping never be NULL if working properly.
|
*/
|
cachemngd = (page->mapping == mngda);
|
#endif
|
|
if (unlikely(err))
|
SetPageError(page);
|
else if (cachemngd)
|
SetPageUptodate(page);
|
|
if (cachemngd)
|
unlock_page(page);
|
}
|
|
z_erofs_vle_unzip_kickoff(bio->bi_private, -1);
|
bio_put(bio);
|
}
|
|
static struct page *z_pagemap_global[Z_EROFS_VLE_VMAP_GLOBAL_PAGES];
|
static DEFINE_MUTEX(z_pagemap_global_lock);
|
|
static int z_erofs_vle_unzip(struct super_block *sb,
|
struct z_erofs_vle_workgroup *grp,
|
struct list_head *page_pool)
|
{
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
struct address_space *const mngda = sbi->managed_cache->i_mapping;
|
#endif
|
const unsigned clusterpages = erofs_clusterpages(sbi);
|
|
struct z_erofs_pagevec_ctor ctor;
|
unsigned int nr_pages;
|
unsigned int sparsemem_pages = 0;
|
struct page *pages_onstack[Z_EROFS_VLE_VMAP_ONSTACK_PAGES];
|
struct page **pages, **compressed_pages, *page;
|
unsigned i, llen;
|
|
enum z_erofs_page_type page_type;
|
bool overlapped;
|
struct z_erofs_vle_work *work;
|
void *vout;
|
int err;
|
|
might_sleep();
|
work = z_erofs_vle_grab_primary_work(grp);
|
DBG_BUGON(!READ_ONCE(work->nr_pages));
|
|
mutex_lock(&work->lock);
|
nr_pages = work->nr_pages;
|
|
if (likely(nr_pages <= Z_EROFS_VLE_VMAP_ONSTACK_PAGES))
|
pages = pages_onstack;
|
else if (nr_pages <= Z_EROFS_VLE_VMAP_GLOBAL_PAGES &&
|
mutex_trylock(&z_pagemap_global_lock))
|
pages = z_pagemap_global;
|
else {
|
repeat:
|
pages = kvmalloc_array(nr_pages,
|
sizeof(struct page *), GFP_KERNEL);
|
|
/* fallback to global pagemap for the lowmem scenario */
|
if (unlikely(pages == NULL)) {
|
if (nr_pages > Z_EROFS_VLE_VMAP_GLOBAL_PAGES)
|
goto repeat;
|
else {
|
mutex_lock(&z_pagemap_global_lock);
|
pages = z_pagemap_global;
|
}
|
}
|
}
|
|
for (i = 0; i < nr_pages; ++i)
|
pages[i] = NULL;
|
|
err = 0;
|
z_erofs_pagevec_ctor_init(&ctor,
|
Z_EROFS_VLE_INLINE_PAGEVECS, work->pagevec, 0);
|
|
for (i = 0; i < work->vcnt; ++i) {
|
unsigned pagenr;
|
|
page = z_erofs_pagevec_ctor_dequeue(&ctor, &page_type);
|
|
/* all pages in pagevec ought to be valid */
|
DBG_BUGON(page == NULL);
|
DBG_BUGON(page->mapping == NULL);
|
|
if (z_erofs_gather_if_stagingpage(page_pool, page))
|
continue;
|
|
if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD)
|
pagenr = 0;
|
else
|
pagenr = z_erofs_onlinepage_index(page);
|
|
DBG_BUGON(pagenr >= nr_pages);
|
|
/*
|
* 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 = -EIO;
|
}
|
pages[pagenr] = page;
|
}
|
sparsemem_pages = i;
|
|
z_erofs_pagevec_ctor_exit(&ctor, true);
|
|
overlapped = false;
|
compressed_pages = grp->compressed_pages;
|
|
for (i = 0; i < clusterpages; ++i) {
|
unsigned pagenr;
|
|
page = compressed_pages[i];
|
|
/* all compressed pages ought to be valid */
|
DBG_BUGON(page == NULL);
|
DBG_BUGON(page->mapping == NULL);
|
|
if (!z_erofs_is_stagingpage(page)) {
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
if (page->mapping == mngda) {
|
if (unlikely(!PageUptodate(page)))
|
err = -EIO;
|
continue;
|
}
|
#endif
|
|
/*
|
* only if non-head page can be selected
|
* for inplace decompression
|
*/
|
pagenr = z_erofs_onlinepage_index(page);
|
|
DBG_BUGON(pagenr >= nr_pages);
|
if (pages[pagenr]) {
|
DBG_BUGON(1);
|
SetPageError(pages[pagenr]);
|
z_erofs_onlinepage_endio(pages[pagenr]);
|
err = -EIO;
|
}
|
++sparsemem_pages;
|
pages[pagenr] = page;
|
|
overlapped = true;
|
}
|
|
/* PG_error needs checking for inplaced and staging pages */
|
if (unlikely(PageError(page))) {
|
DBG_BUGON(PageUptodate(page));
|
err = -EIO;
|
}
|
}
|
|
if (unlikely(err))
|
goto out;
|
|
llen = (nr_pages << PAGE_SHIFT) - work->pageofs;
|
|
if (z_erofs_vle_workgrp_fmt(grp) == Z_EROFS_VLE_WORKGRP_FMT_PLAIN) {
|
err = z_erofs_vle_plain_copy(compressed_pages, clusterpages,
|
pages, nr_pages, work->pageofs);
|
goto out;
|
}
|
|
if (llen > grp->llen)
|
llen = grp->llen;
|
|
err = z_erofs_vle_unzip_fast_percpu(compressed_pages, clusterpages,
|
pages, llen, work->pageofs);
|
if (err != -ENOTSUPP)
|
goto out;
|
|
if (sparsemem_pages >= nr_pages)
|
goto skip_allocpage;
|
|
for (i = 0; i < nr_pages; ++i) {
|
if (pages[i] != NULL)
|
continue;
|
|
pages[i] = __stagingpage_alloc(page_pool, GFP_NOFS);
|
}
|
|
skip_allocpage:
|
vout = erofs_vmap(pages, nr_pages);
|
if (!vout) {
|
err = -ENOMEM;
|
goto out;
|
}
|
|
err = z_erofs_vle_unzip_vmap(compressed_pages,
|
clusterpages, vout, llen, work->pageofs, overlapped);
|
|
erofs_vunmap(vout, nr_pages);
|
|
out:
|
/* must handle all compressed pages before endding pages */
|
for (i = 0; i < clusterpages; ++i) {
|
page = compressed_pages[i];
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
if (page->mapping == mngda)
|
continue;
|
#endif
|
/* recycle all individual staging pages */
|
(void)z_erofs_gather_if_stagingpage(page_pool, page);
|
|
WRITE_ONCE(compressed_pages[i], NULL);
|
}
|
|
for (i = 0; i < nr_pages; ++i) {
|
page = pages[i];
|
if (!page)
|
continue;
|
|
DBG_BUGON(page->mapping == NULL);
|
|
/* recycle all individual staging pages */
|
if (z_erofs_gather_if_stagingpage(page_pool, page))
|
continue;
|
|
if (unlikely(err < 0))
|
SetPageError(page);
|
|
z_erofs_onlinepage_endio(page);
|
}
|
|
if (pages == z_pagemap_global)
|
mutex_unlock(&z_pagemap_global_lock);
|
else if (unlikely(pages != pages_onstack))
|
kvfree(pages);
|
|
work->nr_pages = 0;
|
work->vcnt = 0;
|
|
/* all work locks MUST be taken before the following line */
|
|
WRITE_ONCE(grp->next, Z_EROFS_VLE_WORKGRP_NIL);
|
|
/* all work locks SHOULD be released right now */
|
mutex_unlock(&work->lock);
|
|
z_erofs_vle_work_release(work);
|
return err;
|
}
|
|
static void z_erofs_vle_unzip_all(struct super_block *sb,
|
struct z_erofs_vle_unzip_io *io,
|
struct list_head *page_pool)
|
{
|
z_erofs_vle_owned_workgrp_t owned = io->head;
|
|
while (owned != Z_EROFS_VLE_WORKGRP_TAIL_CLOSED) {
|
struct z_erofs_vle_workgroup *grp;
|
|
/* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */
|
DBG_BUGON(owned == Z_EROFS_VLE_WORKGRP_TAIL);
|
|
/* no possible that 'owned' equals NULL */
|
DBG_BUGON(owned == Z_EROFS_VLE_WORKGRP_NIL);
|
|
grp = owned;
|
owned = READ_ONCE(grp->next);
|
|
z_erofs_vle_unzip(sb, grp, page_pool);
|
}
|
}
|
|
static void z_erofs_vle_unzip_wq(struct work_struct *work)
|
{
|
struct z_erofs_vle_unzip_io_sb *iosb = container_of(work,
|
struct z_erofs_vle_unzip_io_sb, io.u.work);
|
LIST_HEAD(page_pool);
|
|
DBG_BUGON(iosb->io.head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
z_erofs_vle_unzip_all(iosb->sb, &iosb->io, &page_pool);
|
|
put_pages_list(&page_pool);
|
kvfree(iosb);
|
}
|
|
static inline struct z_erofs_vle_unzip_io *
|
prepare_io_handler(struct super_block *sb,
|
struct z_erofs_vle_unzip_io *io,
|
bool background)
|
{
|
struct z_erofs_vle_unzip_io_sb *iosb;
|
|
if (!background) {
|
/* waitqueue available for foreground io */
|
BUG_ON(io == NULL);
|
|
init_waitqueue_head(&io->u.wait);
|
atomic_set(&io->pending_bios, 0);
|
goto out;
|
}
|
|
if (io != NULL)
|
BUG();
|
else {
|
/* allocate extra io descriptor for background io */
|
iosb = kvzalloc(sizeof(struct z_erofs_vle_unzip_io_sb),
|
GFP_KERNEL | __GFP_NOFAIL);
|
BUG_ON(iosb == NULL);
|
|
io = &iosb->io;
|
}
|
|
iosb->sb = sb;
|
INIT_WORK(&io->u.work, z_erofs_vle_unzip_wq);
|
out:
|
io->head = Z_EROFS_VLE_WORKGRP_TAIL_CLOSED;
|
return io;
|
}
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
/* true - unlocked (noio), false - locked (need submit io) */
|
static inline bool recover_managed_page(struct z_erofs_vle_workgroup *grp,
|
struct page *page)
|
{
|
wait_on_page_locked(page);
|
if (PagePrivate(page) && PageUptodate(page))
|
return true;
|
|
lock_page(page);
|
ClearPageError(page);
|
|
if (unlikely(!PagePrivate(page))) {
|
set_page_private(page, (unsigned long)grp);
|
SetPagePrivate(page);
|
}
|
if (unlikely(PageUptodate(page))) {
|
unlock_page(page);
|
return true;
|
}
|
return false;
|
}
|
|
#define __FSIO_1 1
|
#else
|
#define __FSIO_1 0
|
#endif
|
|
static bool z_erofs_vle_submit_all(struct super_block *sb,
|
z_erofs_vle_owned_workgrp_t owned_head,
|
struct list_head *pagepool,
|
struct z_erofs_vle_unzip_io *fg_io,
|
bool force_fg)
|
{
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
const unsigned clusterpages = erofs_clusterpages(sbi);
|
const gfp_t gfp = GFP_NOFS;
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
struct address_space *const mngda = sbi->managed_cache->i_mapping;
|
struct z_erofs_vle_workgroup *lstgrp_noio = NULL, *lstgrp_io = NULL;
|
#endif
|
struct z_erofs_vle_unzip_io *ios[1 + __FSIO_1];
|
struct bio *bio;
|
tagptr1_t bi_private;
|
/* since bio will be NULL, no need to initialize last_index */
|
pgoff_t uninitialized_var(last_index);
|
bool force_submit = false;
|
unsigned nr_bios;
|
|
if (unlikely(owned_head == Z_EROFS_VLE_WORKGRP_TAIL))
|
return false;
|
|
/*
|
* force_fg == 1, (io, fg_io[0]) no io, (io, fg_io[1]) need submit io
|
* force_fg == 0, (io, fg_io[0]) no io; (io[1], bg_io) need submit io
|
*/
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
ios[0] = prepare_io_handler(sb, fg_io + 0, false);
|
#endif
|
|
if (force_fg) {
|
ios[__FSIO_1] = prepare_io_handler(sb, fg_io + __FSIO_1, false);
|
bi_private = tagptr_fold(tagptr1_t, ios[__FSIO_1], 0);
|
} else {
|
ios[__FSIO_1] = prepare_io_handler(sb, NULL, true);
|
bi_private = tagptr_fold(tagptr1_t, ios[__FSIO_1], 1);
|
}
|
|
nr_bios = 0;
|
force_submit = false;
|
bio = NULL;
|
|
/* by default, all need io submission */
|
ios[__FSIO_1]->head = owned_head;
|
|
do {
|
struct z_erofs_vle_workgroup *grp;
|
struct page **compressed_pages, *oldpage, *page;
|
pgoff_t first_index;
|
unsigned i = 0;
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
unsigned int noio = 0;
|
bool cachemngd;
|
#endif
|
int err;
|
|
/* no possible 'owned_head' equals the following */
|
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
DBG_BUGON(owned_head == Z_EROFS_VLE_WORKGRP_NIL);
|
|
grp = owned_head;
|
|
/* close the main owned chain at first */
|
owned_head = cmpxchg(&grp->next, Z_EROFS_VLE_WORKGRP_TAIL,
|
Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
first_index = grp->obj.index;
|
compressed_pages = grp->compressed_pages;
|
|
force_submit |= (first_index != last_index + 1);
|
repeat:
|
/* fulfill all compressed pages */
|
oldpage = page = READ_ONCE(compressed_pages[i]);
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
cachemngd = false;
|
|
if (page == EROFS_UNALLOCATED_CACHED_PAGE) {
|
cachemngd = true;
|
goto do_allocpage;
|
} else if (page != NULL) {
|
if (page->mapping != mngda)
|
BUG_ON(PageUptodate(page));
|
else if (recover_managed_page(grp, page)) {
|
/* page is uptodate, skip io submission */
|
force_submit = true;
|
++noio;
|
goto skippage;
|
}
|
} else {
|
do_allocpage:
|
#else
|
if (page != NULL)
|
BUG_ON(PageUptodate(page));
|
else {
|
#endif
|
page = __stagingpage_alloc(pagepool, gfp);
|
|
if (oldpage != cmpxchg(compressed_pages + i,
|
oldpage, page)) {
|
list_add(&page->lru, pagepool);
|
goto repeat;
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
} else if (cachemngd && !add_to_page_cache_lru(page,
|
mngda, first_index + i, gfp)) {
|
set_page_private(page, (unsigned long)grp);
|
SetPagePrivate(page);
|
#endif
|
}
|
}
|
|
if (bio != NULL && force_submit) {
|
submit_bio_retry:
|
__submit_bio(bio, REQ_OP_READ, 0);
|
bio = NULL;
|
}
|
|
if (bio == NULL) {
|
bio = prepare_bio(sb, first_index + i,
|
BIO_MAX_PAGES, z_erofs_vle_read_endio);
|
bio->bi_private = tagptr_cast_ptr(bi_private);
|
|
++nr_bios;
|
}
|
|
err = bio_add_page(bio, page, PAGE_SIZE, 0);
|
if (err < PAGE_SIZE)
|
goto submit_bio_retry;
|
|
force_submit = false;
|
last_index = first_index + i;
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
skippage:
|
#endif
|
if (++i < clusterpages)
|
goto repeat;
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
if (noio < clusterpages) {
|
lstgrp_io = grp;
|
} else {
|
z_erofs_vle_owned_workgrp_t iogrp_next =
|
owned_head == Z_EROFS_VLE_WORKGRP_TAIL ?
|
Z_EROFS_VLE_WORKGRP_TAIL_CLOSED :
|
owned_head;
|
|
if (lstgrp_io == NULL)
|
ios[1]->head = iogrp_next;
|
else
|
WRITE_ONCE(lstgrp_io->next, iogrp_next);
|
|
if (lstgrp_noio == NULL)
|
ios[0]->head = grp;
|
else
|
WRITE_ONCE(lstgrp_noio->next, grp);
|
|
lstgrp_noio = grp;
|
}
|
#endif
|
} while (owned_head != Z_EROFS_VLE_WORKGRP_TAIL);
|
|
if (bio != NULL)
|
__submit_bio(bio, REQ_OP_READ, 0);
|
|
#ifndef EROFS_FS_HAS_MANAGED_CACHE
|
BUG_ON(!nr_bios);
|
#else
|
if (lstgrp_noio != NULL)
|
WRITE_ONCE(lstgrp_noio->next, Z_EROFS_VLE_WORKGRP_TAIL_CLOSED);
|
|
if (!force_fg && !nr_bios) {
|
kvfree(container_of(ios[1],
|
struct z_erofs_vle_unzip_io_sb, io));
|
return true;
|
}
|
#endif
|
|
z_erofs_vle_unzip_kickoff(tagptr_cast_ptr(bi_private), nr_bios);
|
return true;
|
}
|
|
static void z_erofs_submit_and_unzip(struct z_erofs_vle_frontend *f,
|
struct list_head *pagepool,
|
bool force_fg)
|
{
|
struct super_block *sb = f->inode->i_sb;
|
struct z_erofs_vle_unzip_io io[1 + __FSIO_1];
|
|
if (!z_erofs_vle_submit_all(sb, f->owned_head, pagepool, io, force_fg))
|
return;
|
|
#ifdef EROFS_FS_HAS_MANAGED_CACHE
|
z_erofs_vle_unzip_all(sb, &io[0], pagepool);
|
#endif
|
if (!force_fg)
|
return;
|
|
/* wait until all bios are completed */
|
wait_event(io[__FSIO_1].u.wait,
|
!atomic_read(&io[__FSIO_1].pending_bios));
|
|
/* let's synchronous decompression */
|
z_erofs_vle_unzip_all(sb, &io[__FSIO_1], pagepool);
|
}
|
|
static int z_erofs_vle_normalaccess_readpage(struct file *file,
|
struct page *page)
|
{
|
struct inode *const inode = page->mapping->host;
|
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
|
int err;
|
LIST_HEAD(pagepool);
|
|
#if (EROFS_FS_ZIP_CACHE_LVL >= 2)
|
f.cachedzone_la = page->index << PAGE_SHIFT;
|
#endif
|
err = z_erofs_do_read_page(&f, page, &pagepool);
|
(void)z_erofs_vle_work_iter_end(&f.builder);
|
|
/* if some compressed cluster ready, need submit them anyway */
|
z_erofs_submit_and_unzip(&f, &pagepool, true);
|
|
if (err)
|
errln("%s, failed to read, err [%d]", __func__, err);
|
|
if (f.m_iter.mpage != NULL)
|
put_page(f.m_iter.mpage);
|
|
/* clean up the remaining free pages */
|
put_pages_list(&pagepool);
|
return err;
|
}
|
|
static inline int __z_erofs_vle_normalaccess_readpages(
|
struct file *filp,
|
struct address_space *mapping,
|
struct list_head *pages, unsigned nr_pages, bool sync)
|
{
|
struct inode *const inode = mapping->host;
|
|
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
|
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
|
struct page *head = NULL;
|
LIST_HEAD(pagepool);
|
|
#if (EROFS_FS_ZIP_CACHE_LVL >= 2)
|
f.cachedzone_la = lru_to_page(pages)->index << PAGE_SHIFT;
|
#endif
|
for (; nr_pages; --nr_pages) {
|
struct page *page = lru_to_page(pages);
|
|
prefetchw(&page->flags);
|
list_del(&page->lru);
|
|
if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
|
list_add(&page->lru, &pagepool);
|
continue;
|
}
|
|
set_page_private(page, (unsigned long)head);
|
head = page;
|
}
|
|
while (head != NULL) {
|
struct page *page = head;
|
int err;
|
|
/* traversal in reverse order */
|
head = (void *)page_private(page);
|
|
err = z_erofs_do_read_page(&f, page, &pagepool);
|
if (err) {
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
errln("%s, readahead error at page %lu of nid %llu",
|
__func__, page->index, vi->nid);
|
}
|
|
put_page(page);
|
}
|
|
(void)z_erofs_vle_work_iter_end(&f.builder);
|
|
z_erofs_submit_and_unzip(&f, &pagepool, sync);
|
|
if (f.m_iter.mpage != NULL)
|
put_page(f.m_iter.mpage);
|
|
/* clean up the remaining free pages */
|
put_pages_list(&pagepool);
|
return 0;
|
}
|
|
static int z_erofs_vle_normalaccess_readpages(
|
struct file *filp,
|
struct address_space *mapping,
|
struct list_head *pages, unsigned nr_pages)
|
{
|
return __z_erofs_vle_normalaccess_readpages(filp,
|
mapping, pages, nr_pages,
|
nr_pages < 4 /* sync */);
|
}
|
|
const struct address_space_operations z_erofs_vle_normalaccess_aops = {
|
.readpage = z_erofs_vle_normalaccess_readpage,
|
.readpages = z_erofs_vle_normalaccess_readpages,
|
};
|
|
#define __vle_cluster_advise(x, bit, bits) \
|
((le16_to_cpu(x) >> (bit)) & ((1 << (bits)) - 1))
|
|
#define __vle_cluster_type(advise) __vle_cluster_advise(advise, \
|
Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT, Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS)
|
|
enum {
|
Z_EROFS_VLE_CLUSTER_TYPE_PLAIN,
|
Z_EROFS_VLE_CLUSTER_TYPE_HEAD,
|
Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD,
|
Z_EROFS_VLE_CLUSTER_TYPE_RESERVED,
|
Z_EROFS_VLE_CLUSTER_TYPE_MAX
|
};
|
|
#define vle_cluster_type(di) \
|
__vle_cluster_type((di)->di_advise)
|
|
static inline unsigned
|
vle_compressed_index_clusterofs(unsigned clustersize,
|
struct z_erofs_vle_decompressed_index *di)
|
{
|
debugln("%s, vle=%pK, advise=%x (type %u), clusterofs=%x blkaddr=%x",
|
__func__, di, di->di_advise, vle_cluster_type(di),
|
di->di_clusterofs, di->di_u.blkaddr);
|
|
switch (vle_cluster_type(di)) {
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
break;
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
return di->di_clusterofs;
|
default:
|
BUG_ON(1);
|
}
|
return clustersize;
|
}
|
|
static inline erofs_blk_t
|
vle_extent_blkaddr(struct inode *inode, pgoff_t index)
|
{
|
struct erofs_sb_info *sbi = EROFS_I_SB(inode);
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
unsigned ofs = Z_EROFS_VLE_EXTENT_ALIGN(vi->inode_isize +
|
vi->xattr_isize) + sizeof(struct erofs_extent_header) +
|
index * sizeof(struct z_erofs_vle_decompressed_index);
|
|
return erofs_blknr(iloc(sbi, vi->nid) + ofs);
|
}
|
|
static inline unsigned int
|
vle_extent_blkoff(struct inode *inode, pgoff_t index)
|
{
|
struct erofs_sb_info *sbi = EROFS_I_SB(inode);
|
struct erofs_vnode *vi = EROFS_V(inode);
|
|
unsigned ofs = Z_EROFS_VLE_EXTENT_ALIGN(vi->inode_isize +
|
vi->xattr_isize) + sizeof(struct erofs_extent_header) +
|
index * sizeof(struct z_erofs_vle_decompressed_index);
|
|
return erofs_blkoff(iloc(sbi, vi->nid) + ofs);
|
}
|
|
/*
|
* Variable-sized Logical Extent (Fixed Physical Cluster) Compression Mode
|
* ---
|
* VLE compression mode attempts to compress a number of logical data into
|
* a physical cluster with a fixed size.
|
* VLE compression mode uses "struct z_erofs_vle_decompressed_index".
|
*/
|
static erofs_off_t vle_get_logical_extent_head(
|
struct inode *inode,
|
struct page **page_iter,
|
void **kaddr_iter,
|
unsigned lcn, /* logical cluster number */
|
erofs_blk_t *pcn,
|
unsigned *flags)
|
{
|
/* for extent meta */
|
struct page *page = *page_iter;
|
erofs_blk_t blkaddr = vle_extent_blkaddr(inode, lcn);
|
struct z_erofs_vle_decompressed_index *di;
|
unsigned long long ofs;
|
const unsigned int clusterbits = EROFS_SB(inode->i_sb)->clusterbits;
|
const unsigned int clustersize = 1 << clusterbits;
|
unsigned int delta0;
|
|
if (page->index != blkaddr) {
|
kunmap_atomic(*kaddr_iter);
|
unlock_page(page);
|
put_page(page);
|
|
*page_iter = page = erofs_get_meta_page(inode->i_sb,
|
blkaddr, false);
|
*kaddr_iter = kmap_atomic(page);
|
}
|
|
di = *kaddr_iter + vle_extent_blkoff(inode, lcn);
|
switch (vle_cluster_type(di)) {
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
delta0 = le16_to_cpu(di->di_u.delta[0]);
|
DBG_BUGON(!delta0);
|
DBG_BUGON(lcn < delta0);
|
|
ofs = vle_get_logical_extent_head(inode,
|
page_iter, kaddr_iter,
|
lcn - delta0, pcn, flags);
|
break;
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
*flags ^= EROFS_MAP_ZIPPED;
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
/* clustersize should be a power of two */
|
ofs = ((unsigned long long)lcn << clusterbits) +
|
(le16_to_cpu(di->di_clusterofs) & (clustersize - 1));
|
*pcn = le32_to_cpu(di->di_u.blkaddr);
|
break;
|
default:
|
BUG_ON(1);
|
}
|
return ofs;
|
}
|
|
int z_erofs_map_blocks_iter(struct inode *inode,
|
struct erofs_map_blocks *map,
|
struct page **mpage_ret, int flags)
|
{
|
/* logicial extent (start, end) offset */
|
unsigned long long ofs, end;
|
struct z_erofs_vle_decompressed_index *di;
|
erofs_blk_t e_blkaddr, pcn;
|
unsigned lcn, logical_cluster_ofs, cluster_type;
|
u32 ofs_rem;
|
struct page *mpage = *mpage_ret;
|
void *kaddr;
|
bool initial;
|
const unsigned int clusterbits = EROFS_SB(inode->i_sb)->clusterbits;
|
const unsigned int clustersize = 1 << clusterbits;
|
int err = 0;
|
|
/* if both m_(l,p)len are 0, regularize l_lblk, l_lofs, etc... */
|
initial = !map->m_llen;
|
|
/* when trying to read beyond EOF, leave it unmapped */
|
if (unlikely(map->m_la >= inode->i_size)) {
|
BUG_ON(!initial);
|
map->m_llen = map->m_la + 1 - inode->i_size;
|
map->m_la = inode->i_size - 1;
|
map->m_flags = 0;
|
goto out;
|
}
|
|
debugln("%s, m_la %llu m_llen %llu --- start", __func__,
|
map->m_la, map->m_llen);
|
|
ofs = map->m_la + map->m_llen;
|
|
/* clustersize should be power of two */
|
lcn = ofs >> clusterbits;
|
ofs_rem = ofs & (clustersize - 1);
|
|
e_blkaddr = vle_extent_blkaddr(inode, lcn);
|
|
if (mpage == NULL || mpage->index != e_blkaddr) {
|
if (mpage != NULL)
|
put_page(mpage);
|
|
mpage = erofs_get_meta_page(inode->i_sb, e_blkaddr, false);
|
*mpage_ret = mpage;
|
} else {
|
lock_page(mpage);
|
DBG_BUGON(!PageUptodate(mpage));
|
}
|
|
kaddr = kmap_atomic(mpage);
|
di = kaddr + vle_extent_blkoff(inode, lcn);
|
|
debugln("%s, lcn %u e_blkaddr %u e_blkoff %u", __func__, lcn,
|
e_blkaddr, vle_extent_blkoff(inode, lcn));
|
|
logical_cluster_ofs = vle_compressed_index_clusterofs(clustersize, di);
|
if (!initial) {
|
/* [walking mode] 'map' has been already initialized */
|
map->m_llen += logical_cluster_ofs;
|
goto unmap_out;
|
}
|
|
/* by default, compressed */
|
map->m_flags |= EROFS_MAP_ZIPPED;
|
|
end = (u64)(lcn + 1) * clustersize;
|
|
cluster_type = vle_cluster_type(di);
|
|
switch (cluster_type) {
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
if (ofs_rem >= logical_cluster_ofs)
|
map->m_flags ^= EROFS_MAP_ZIPPED;
|
/* fallthrough */
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
|
if (ofs_rem == logical_cluster_ofs) {
|
pcn = le32_to_cpu(di->di_u.blkaddr);
|
goto exact_hitted;
|
}
|
|
if (ofs_rem > logical_cluster_ofs) {
|
ofs = lcn * clustersize | logical_cluster_ofs;
|
pcn = le32_to_cpu(di->di_u.blkaddr);
|
break;
|
}
|
|
/* logical cluster number should be >= 1 */
|
if (unlikely(!lcn)) {
|
errln("invalid logical cluster 0 at nid %llu",
|
EROFS_V(inode)->nid);
|
err = -EIO;
|
goto unmap_out;
|
}
|
end = (lcn-- * clustersize) | logical_cluster_ofs;
|
/* fallthrough */
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
/* get the correspoinding first chunk */
|
ofs = vle_get_logical_extent_head(inode, mpage_ret,
|
&kaddr, lcn, &pcn, &map->m_flags);
|
mpage = *mpage_ret;
|
break;
|
default:
|
errln("unknown cluster type %u at offset %llu of nid %llu",
|
cluster_type, ofs, EROFS_V(inode)->nid);
|
err = -EIO;
|
goto unmap_out;
|
}
|
|
map->m_la = ofs;
|
exact_hitted:
|
map->m_llen = end - ofs;
|
map->m_plen = clustersize;
|
map->m_pa = blknr_to_addr(pcn);
|
map->m_flags |= EROFS_MAP_MAPPED;
|
unmap_out:
|
kunmap_atomic(kaddr);
|
unlock_page(mpage);
|
out:
|
debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
|
__func__, map->m_la, map->m_pa,
|
map->m_llen, map->m_plen, map->m_flags);
|
|
/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
|
DBG_BUGON(err < 0);
|
return err;
|
}
|
