Commit 9c421ef3 authored by Hongbo Li's avatar Hongbo Li Committed by Gao Xiang
Browse files

erofs: support STATX_DIOALIGN 



Add support for STATX_DIOALIGN to EROFS, so that direct I/O
alignment restrictions are exposed to userspace in a generic
way.

[Before]
```
./statx_test /mnt/erofs/testfile
statx(/mnt/erofs/testfile) = 0
dio mem align:0
dio offset align:0
```

[After]
```
./statx_test /mnt/erofs/testfile
statx(/mnt/erofs/testfile) = 0
dio mem align:512
dio offset align:512
```

Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Reviewed-by: default avatarChao Yu <chao@kernel.org>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240718083243.2485437-1-hsiangkao@linux.alibaba.com
parent a3c10bed

fs/erofs/inode.c

+17 −2
Original line number Diff line number Diff line
@@ -334,14 +334,29 @@ int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 
		  unsigned int query_flags)

{

	struct inode *const inode = d_inode(path->dentry);

	bool compressed =

		erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);



	if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))

	if (compressed)

		stat->attributes |= STATX_ATTR_COMPRESSED;



	stat->attributes |= STATX_ATTR_IMMUTABLE;

	stat->attributes_mask |= (STATX_ATTR_COMPRESSED |

				  STATX_ATTR_IMMUTABLE);



	/*

	 * Return the DIO alignment restrictions if requested.

	 *

	 * In EROFS, STATX_DIOALIGN is not supported in ondemand mode and

	 * compressed files, so in these cases we report no DIO support.

	 */

	if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {

		stat->result_mask |= STATX_DIOALIGN;

		if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {

			stat->dio_mem_align =

				bdev_logical_block_size(inode->i_sb->s_bdev);

			stat->dio_offset_align = stat->dio_mem_align;

		}

	}

	generic_fillattr(idmap, request_mask, inode, stat);

	return 0;

}