From: Christoph Hellwig <hch@lst.de>
To: Chandan Babu R <chandan.babu@oracle.com>,
"Darrick J. Wong" <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>, linux-xfs@vger.kernel.org
Subject: [PATCH 4/9] xfs: don't open code XFS_FILBLKS_MIN in xfs_bmapi_write
Date: Mon, 29 Apr 2024 08:15:24 +0200 [thread overview]
Message-ID: <20240429061529.1550204-5-hch@lst.de> (raw)
In-Reply-To: <20240429061529.1550204-1-hch@lst.de>
XFS_FILBLKS_MIN uses min_t and thus does the comparison using the correct
xfs_filblks_t type. Use it in xfs_bmapi_write and slightly adjust the
comment document th potential pitfall to take account of this
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_bmap.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index ee8f86c03185fc..f7b263d0b0cf1c 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -4528,14 +4528,11 @@ xfs_bmapi_write(
* allocation length request (which can be 64 bits in
* length) and the bma length request, which is
* xfs_extlen_t and therefore 32 bits. Hence we have to
- * check for 32-bit overflows and handle them here.
+ * be careful and do the min() using the larger type to
+ * avoid overflows.
*/
- if (len > (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN)
- bma.length = XFS_MAX_BMBT_EXTLEN;
- else
- bma.length = len;
+ bma.length = XFS_FILBLKS_MIN(len, XFS_MAX_BMBT_EXTLEN);
- ASSERT(len > 0);
ASSERT(bma.length > 0);
error = xfs_bmapi_allocate(&bma);
if (error) {
--
2.39.2
next prev parent reply other threads:[~2024-04-29 6:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 6:15 xfs_bmapi_write retval fix v2 Christoph Hellwig
2024-04-29 6:15 ` [PATCH 1/9] xfs: fix error returns from xfs_bmapi_write Christoph Hellwig
[not found] ` <CAEJPjCu5CWEMHHpLS2yB7tk9Hh52EsQ5npifKiw--U-50PLEng@mail.gmail.com>
2024-05-06 12:39 ` 刘通
2024-04-29 6:15 ` [PATCH 2/9] xfs: remove the unusued tmp_logflags variable in xfs_bmapi_allocate Christoph Hellwig
2024-04-29 6:15 ` [PATCH 3/9] xfs: lift a xfs_valid_startblock into xfs_bmapi_allocate Christoph Hellwig
2024-04-29 6:15 ` Christoph Hellwig [this message]
2024-04-29 6:15 ` [PATCH 5/9] xfs: pass the actual offset and len to allocate to xfs_bmapi_allocate Christoph Hellwig
2024-04-29 15:48 ` Darrick J. Wong
2024-04-29 17:18 ` Christoph Hellwig
2024-04-29 17:20 ` Darrick J. Wong
2024-04-29 6:15 ` [PATCH 6/9] xfs: remove the xfs_iext_peek_prev_extent call in xfs_bmapi_allocate Christoph Hellwig
2024-04-29 6:15 ` [PATCH 7/9] xfs: fix xfs_bmap_add_extent_delay_real for partial conversions Christoph Hellwig
2024-04-29 15:48 ` Darrick J. Wong
2024-04-29 6:15 ` [PATCH 8/9] xfs: do not allocate the entire delalloc extent in xfs_bmapi_write Christoph Hellwig
2024-04-29 6:15 ` [PATCH 9/9] mm,page_owner: don't remove GFP flags in add_stack_record_to_list Christoph Hellwig
2024-04-29 6:17 ` Christoph Hellwig
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