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: Hongbo Li <[email protected]> Signed-off-by: Kent Overstreet <[email protected]>
koverstreet · Jun 20, 2024 · 001dbd0 · 001dbd0
1 parent 27ea5d6
commit 001dbd0
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
@@ -888,6 +888,12 @@ 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;
+		stat->dio_mem_align = 1;
+		stat->dio_offset_align = SECTOR_SIZE;
+	}
+
 	if (request_mask & STATX_BTIME) {
 		stat->result_mask |= STATX_BTIME;
 		stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);