diff options
Diffstat (limited to 'drivers/staging/erofs/unzip_vle.h')
| -rw-r--r-- | drivers/staging/erofs/unzip_vle.h | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/drivers/staging/erofs/unzip_vle.h b/drivers/staging/erofs/unzip_vle.h deleted file mode 100644 index ab509d75aefd..000000000000 --- a/drivers/staging/erofs/unzip_vle.h +++ /dev/null @@ -1,196 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 - * - * linux/drivers/staging/erofs/unzip_vle.h - * - * Copyright (C) 2018 HUAWEI, Inc. - * http://www.huawei.com/ - * Created by Gao Xiang <gaoxiang25@huawei.com> - * - * 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. - */ -#ifndef __EROFS_FS_UNZIP_VLE_H -#define __EROFS_FS_UNZIP_VLE_H - -#include "internal.h" -#include "unzip_pagevec.h" - -#define Z_EROFS_NR_INLINE_PAGEVECS 3 - -/* - * Structure fields follow one of the following exclusion rules. - * - * I: Modifiable by initialization/destruction paths and read-only - * for everyone else. - * - */ - -struct z_erofs_vle_work { - struct mutex lock; - - /* I: decompression offset in page */ - unsigned short pageofs; - unsigned short nr_pages; - - /* L: queued pages in pagevec[] */ - unsigned vcnt; - - union { - /* L: pagevec */ - erofs_vtptr_t pagevec[Z_EROFS_NR_INLINE_PAGEVECS]; - struct rcu_head rcu; - }; -}; - -#define Z_EROFS_VLE_WORKGRP_FMT_PLAIN 0 -#define Z_EROFS_VLE_WORKGRP_FMT_LZ4 1 -#define Z_EROFS_VLE_WORKGRP_FMT_MASK 1 -#define Z_EROFS_VLE_WORKGRP_FULL_LENGTH 2 - -typedef void *z_erofs_vle_owned_workgrp_t; - -struct z_erofs_vle_workgroup { - struct erofs_workgroup obj; - struct z_erofs_vle_work work; - - /* point to next owned_workgrp_t */ - z_erofs_vle_owned_workgrp_t next; - - /* compressed pages (including multi-usage pages) */ - struct page *compressed_pages[Z_EROFS_CLUSTER_MAX_PAGES]; - unsigned int llen, flags; -}; - -/* let's avoid the valid 32-bit kernel addresses */ - -/* the chained workgroup has't submitted io (still open) */ -#define Z_EROFS_VLE_WORKGRP_TAIL ((void *)0x5F0ECAFE) -/* the chained workgroup has already submitted io */ -#define Z_EROFS_VLE_WORKGRP_TAIL_CLOSED ((void *)0x5F0EDEAD) - -#define Z_EROFS_VLE_WORKGRP_NIL (NULL) - -#define z_erofs_vle_workgrp_fmt(grp) \ - ((grp)->flags & Z_EROFS_VLE_WORKGRP_FMT_MASK) - -static inline void z_erofs_vle_set_workgrp_fmt( - struct z_erofs_vle_workgroup *grp, - unsigned int fmt) -{ - grp->flags = fmt | (grp->flags & ~Z_EROFS_VLE_WORKGRP_FMT_MASK); -} - - -/* definitions if multiref is disabled */ -#define z_erofs_vle_grab_primary_work(grp) (&(grp)->work) -#define z_erofs_vle_grab_work(grp, pageofs) (&(grp)->work) -#define z_erofs_vle_work_workgroup(wrk, primary) \ - ((primary) ? container_of(wrk, \ - struct z_erofs_vle_workgroup, work) : \ - ({ BUG(); (void *)NULL; })) - - -#define Z_EROFS_WORKGROUP_SIZE sizeof(struct z_erofs_vle_workgroup) - -struct z_erofs_vle_unzip_io { - atomic_t pending_bios; - z_erofs_vle_owned_workgrp_t head; - - union { - wait_queue_head_t wait; - struct work_struct work; - } u; -}; - -struct z_erofs_vle_unzip_io_sb { - struct z_erofs_vle_unzip_io io; - struct super_block *sb; -}; - -#define Z_EROFS_ONLINEPAGE_COUNT_BITS 2 -#define Z_EROFS_ONLINEPAGE_COUNT_MASK ((1 << Z_EROFS_ONLINEPAGE_COUNT_BITS) - 1) -#define Z_EROFS_ONLINEPAGE_INDEX_SHIFT (Z_EROFS_ONLINEPAGE_COUNT_BITS) - -/* - * waiters (aka. ongoing_packs): # to unlock the page - * sub-index: 0 - for partial page, >= 1 full page sub-index - */ -typedef atomic_t z_erofs_onlinepage_t; - -/* type punning */ -union z_erofs_onlinepage_converter { - z_erofs_onlinepage_t *o; - unsigned long *v; -}; - -static inline unsigned z_erofs_onlinepage_index(struct page *page) -{ - union z_erofs_onlinepage_converter u; - - DBG_BUGON(!PagePrivate(page)); - u.v = &page_private(page); - - return atomic_read(u.o) >> Z_EROFS_ONLINEPAGE_INDEX_SHIFT; -} - -static inline void z_erofs_onlinepage_init(struct page *page) -{ - union { - z_erofs_onlinepage_t o; - unsigned long v; - /* keep from being unlocked in advance */ - } u = { .o = ATOMIC_INIT(1) }; - - set_page_private(page, u.v); - smp_wmb(); - SetPagePrivate(page); -} - -static inline void z_erofs_onlinepage_fixup(struct page *page, - uintptr_t index, bool down) -{ - unsigned long *p, o, v, id; -repeat: - p = &page_private(page); - o = READ_ONCE(*p); - - id = o >> Z_EROFS_ONLINEPAGE_INDEX_SHIFT; - if (id) { - if (!index) - return; - - DBG_BUGON(id != index); - } - - v = (index << Z_EROFS_ONLINEPAGE_INDEX_SHIFT) | - ((o & Z_EROFS_ONLINEPAGE_COUNT_MASK) + (unsigned)down); - if (cmpxchg(p, o, v) != o) - goto repeat; -} - -static inline void z_erofs_onlinepage_endio(struct page *page) -{ - union z_erofs_onlinepage_converter u; - unsigned v; - - DBG_BUGON(!PagePrivate(page)); - u.v = &page_private(page); - - v = atomic_dec_return(u.o); - if (!(v & Z_EROFS_ONLINEPAGE_COUNT_MASK)) { - ClearPagePrivate(page); - if (!PageError(page)) - SetPageUptodate(page); - unlock_page(page); - } - - debugln("%s, page %p value %x", __func__, page, atomic_read(u.o)); -} - -#define Z_EROFS_VLE_VMAP_ONSTACK_PAGES \ - min_t(unsigned int, THREAD_SIZE / 8 / sizeof(struct page *), 96U) -#define Z_EROFS_VLE_VMAP_GLOBAL_PAGES 2048 - -#endif - |