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erofs: fix fsdax unavailability for chunk-based regular files
[ Upstream commit18bddc5b67
] 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:c5aa903a59
("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>
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@ -183,7 +183,8 @@ static void *erofs_read_inode(struct erofs_buf *buf,
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inode->i_flags &= ~S_DAX;
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if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
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vi->datalayout == EROFS_INODE_FLAT_PLAIN)
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(vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
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vi->datalayout == EROFS_INODE_CHUNK_BASED))
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inode->i_flags |= S_DAX;
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if (!nblks)
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