Commit 672e5476 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman

staging: erofs: localize UNALLOCATED_CACHED_PAGE placeholder

In practice, in order to do cached decompression rather than reuse
them for in-place decompression and make full use of pages in
page_pool instead of allocating as much as possible, an unallocated
placeholder was introduce to mark all in compressed_pages[] and
they will be replaced at the time of submission.

Previously EROFS_UNALLOCATED_CACHED_PAGE was included in internal.h,
which is unnecessary since it's only internally used in decompression
subsystem, move it to unzip_vle.c and rename it to PAGE_UNALLOCATED.
Reviewed-by: default avatarChao Yu <>
Signed-off-by: default avatarGao Xiang <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent c1448fa8
......@@ -289,8 +289,6 @@ static inline void erofs_workstation_cleanup_all(struct super_block *sb)
extern int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
struct erofs_workgroup *egrp);
extern int erofs_try_to_free_cached_page(struct address_space *mapping,
......@@ -15,6 +15,12 @@
#include <trace/events/erofs.h>
* a compressed_pages[] placeholder in order to avoid
* being filled with file pages for in-place decompression.
#define PAGE_UNALLOCATED ((void *)0x5F0E4B1D)
static struct workqueue_struct *z_erofs_workqueue __read_mostly;
static struct kmem_cache *z_erofs_workgroup_cachep __read_mostly;
......@@ -147,7 +153,7 @@ static bool grab_managed_cache_pages(struct address_space *mapping,
noio = false;
if (!reserve_allocation)
if (!cmpxchg(compressed_pages + i, NULL, page))
......@@ -1180,7 +1186,7 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
cachemngd = false;
if (page == PAGE_UNALLOCATED) {
cachemngd = true;
goto do_allocpage;
} else if (page) {
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