From: Xin Yin <yinxin.x@xxxxxxxxxxxxx>
[ Upstream commit 18bddc5b67038722cb88fcf51fbf41a0277092cb ]
DAX can be used to share page cache between VMs, reducing guest memory
overhead. And chunk based data format is widely used for VM and
container image. So enable dax support for it, make erofs better used
for VM scenarios.
Fixes: c5aa903a59db ("erofs: support reading chunk-based uncompressed files")
Signed-off-by: Xin Yin <yinxin.x@xxxxxxxxxxxxx>
Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230711062130.7860-1-yinxin.x@xxxxxxxxxxxxx
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/erofs/inode.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 3ff36514cff25..638bb70d0d65b 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -193,7 +193,8 @@ static struct page *erofs_read_inode(struct inode *inode,
inode->i_flags &= ~S_DAX;
if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
- vi->datalayout == EROFS_INODE_FLAT_PLAIN)
+ (vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
+ vi->datalayout == EROFS_INODE_CHUNK_BASED))
inode->i_flags |= S_DAX;
if (!nblks)
/* measure inode.i_blocks as generic filesystems */
--
2.39.2
