linux-kernel - [PATCH RFC 6/7] fs: xfs: buffered atomic writes statx support

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Date: Mon, 22 Apr 2024 14:39:22 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, brauner@...nel.org, djwong@...nel.org,
        viro@...iv.linux.org.uk, jack@...e.cz, akpm@...ux-foundation.org,
        willy@...radead.org, dchinner@...hat.com, tytso@....edu, hch@....de,
        martin.petersen@...cle.com, nilay@...ux.ibm.com, ritesh.list@...il.com,
        mcgrof@...nel.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, ojaswin@...ux.ibm.com, p.raghav@...sung.com,
        jbongio@...gle.com, okiselev@...zon.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC 6/7] fs: xfs: buffered atomic writes statx support

For filling in the statx fields, we use the extent alignment as the
buffered atomic writes size. Only a single size is permitted.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 fs/xfs/xfs_iops.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 05b20c88ff77..d2226df567ca 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -650,12 +650,19 @@ xfs_vn_getattr(
 			stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
 			stat->dio_offset_align = bdev_logical_block_size(bdev);
 		}
-		if (request_mask & STATX_WRITE_ATOMIC_DIO) {
+		if (request_mask & STATX_WRITE_ATOMIC_DIO &&
+		    !(request_mask & STATX_WRITE_ATOMIC_BUF)) {
 			unsigned int unit_min, unit_max;
 
 			xfs_get_atomic_write_attr(ip, &unit_min, &unit_max);
 			generic_fill_statx_atomic_writes(stat,
 				unit_min, unit_max, true);
+		} else if (request_mask & STATX_WRITE_ATOMIC_BUF) {
+			unsigned int unit_min, unit_max;
+
+			xfs_get_atomic_write_attr(ip, &unit_min, &unit_max);
+			generic_fill_statx_atomic_writes(stat,
+				unit_max, unit_max, false);
 		}
 		fallthrough;
 	default:
-- 
2.31.1