VisionFive2 Linux kernel

author: Gao Xiang <hsiangkao@redhat.com> 2020-12-09 20:37:17 +0800 committer: Gao Xiang <hsiangkao@redhat.com> 2020-12-09 20:42:02 +0800 commit: 1825c8d7ce93c4725cb04ad09627fc2829de32ca parent: 473e15b0c0f7cf63a48f776937a02cb9dfcab252

Commit Summary:

erofs: force inplace I/O under low memory scenario

Diffstat:

1 file changed, 3 insertions, 0 deletions

diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
index 4dadde18cdf1..aea129ddda74 100644
--- a/fs/erofs/compress.h
+++ b/fs/erofs/compress.h
@@ -28,11 +28,13 @@ struct z_erofs_decompress_req {
 
 /* some special page->private (unsigned long, see below) */
 #define Z_EROFS_SHORTLIVED_PAGE		(-1UL << 2)
+#define Z_EROFS_PREALLOCATED_PAGE	(-2UL << 2)
 
 /*
  * For all pages in a pcluster, page->private should be one of
  * Type                         Last 2bits      page->private
  * short-lived page             00              Z_EROFS_SHORTLIVED_PAGE
+ * preallocated page (tryalloc) 00              Z_EROFS_PREALLOCATED_PAGE
  * cached/managed page          00              pointer to z_erofs_pcluster
  * online page (file-backed,    01/10/11        sub-index << 2 | count
  *              some pages can be used for inplace I/O)
@@ -40,6 +42,7 @@ struct z_erofs_decompress_req {
  * page->mapping should be one of
  * Type                 page->mapping
  * short-lived page     NULL
+ * preallocated page    NULL
  * cached/managed page  non-NULL or NULL (invalidated/truncated page)
  * online page          non-NULL
  *