erofs: remove useless cache strategy of DELAYEDALLOC

After commit 1825c8d7ce93 ("erofs: force inplace I/O under low
memory scenario") and TRYALLOC is widely used, DELAYEDALLOC won't
be used anymore. Remove related dead code. Also, remove the blank
line at the end of zdata.h.

Link: https://lore.kernel.org/r/20211106082315.25781-1-huyue2@yulong.com
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <xiang@kernel.org>

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index eb51df4..2741196 100644 (file)
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -96,16 +96,9 @@ static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl)
        DBG_BUGON(1);
 }
 
-/*
- * a compressed_pages[] placeholder in order to avoid
- * being filled with file pages for in-place decompression.
- */
-#define PAGE_UNALLOCATED     ((void *)0x5F0E4B1D)
-
 /* how to allocate cached pages for a pcluster */
 enum z_erofs_cache_alloctype {
        DONTALLOC,      /* don't allocate any cached pages */
-       DELAYEDALLOC,   /* delayed allocation (at the time of submitting io) */
        /*
         * try to use cached I/O if page allocation succeeds or fallback
         * to in-place I/O instead to avoid any direct reclaim.
@@ -267,10 +260,6 @@ static void preload_compressed_pages(struct z_erofs_collector *clt,
                        /* I/O is needed, no possible to decompress directly */
                        standalone = false;
                        switch (type) {
-                       case DELAYEDALLOC:
-                               t = tagptr_init(compressed_page_t,
-                                               PAGE_UNALLOCATED);
-                               break;
                        case TRYALLOC:
                                newpage = erofs_allocpage(pagepool, gfp);
                                if (!newpage)
@@ -1092,15 +1081,6 @@ repeat:
        if (!page)
                goto out_allocpage;
 
-       /*
-        * the cached page has not been allocated and
-        * an placeholder is out there, prepare it now.
-        */
-       if (page == PAGE_UNALLOCATED) {
-               tocache = true;
-               goto out_allocpage;
-       }
-
        /* process the target tagged pointer */
        t = tagptr_init(compressed_page_t, page);
        justfound = tagptr_unfold_tags(t);

diff --git a/fs/erofs/zdata.h b/fs/erofs/zdata.h
index 3a008f1..9321b35 100644 (file)
--- a/fs/erofs/zdata.h
+++ b/fs/erofs/zdata.h
@@ -186,4 +186,3 @@ static inline void z_erofs_onlinepage_endio(struct page *page)
 #define Z_EROFS_VMAP_GLOBAL_PAGES      2048
 
 #endif
-