From: Xin Yin yinxin.x@bytedance.com
[ 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@bytedance.com Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com Reviewed-by: Chao Yu chao@kernel.org Link: https://lore.kernel.org/r/20230711062130.7860-1-yinxin.x@bytedance.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 5aadc73d57652..e090bcd46db14 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -186,7 +186,8 @@ static void *erofs_read_inode(struct erofs_buf *buf,
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 */