Commit 95924420 authored by Hongbo Li's avatar Hongbo Li Committed by Kent Overstreet
Browse files

bcachefs: support STATX_DIOALIGN for statx file 



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

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

[After]
```
./statx_test /mnt/bcachefs/test
statx(/mnt/bcachefs/test) = 0
dio mem align:1
dio offset align:512
```

Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
parent 7aa7183e

fs/bcachefs/fs.c

+10 −0
Original line number Diff line number Diff line
@@ -895,6 +895,16 @@ static int bch2_getattr(struct mnt_idmap *idmap, 
	stat->subvol	= inode->ei_subvol;

	stat->result_mask |= STATX_SUBVOL;



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

		stat->result_mask |= STATX_DIOALIGN;

		/*

		 * this is incorrect; we should be tracking this in superblock,

		 * and checking the alignment of open devices

		 */

		stat->dio_mem_align = SECTOR_SIZE;

		stat->dio_offset_align = block_bytes(c);

	}



	if (request_mask & STATX_BTIME) {

		stat->result_mask |= STATX_BTIME;

		stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);