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bcachefs: support STATX_DIOALIGN for statx file

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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: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Hongbo Li 2024-06-20 21:21:12 +08:00 committed by Kent Overstreet
parent 7aa7183e00
commit 95924420b0
1 changed files with 10 additions and 0 deletions
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10
fs/bcachefs/fs.c
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@ -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);