From: Peter Watkins <treestem@gmail.com>
To: xfs@oss.sgi.com
Cc: Peter Watkins <treestem@gmail.com>
Subject: [PATCH v2] xfs: overflow in xfs_iomap_eof_align_last_fsb
Date: Mon, 1 Dec 2014 17:45:28 -0500 [thread overview]
Message-ID: <1417473928-447-1-git-send-email-treestem@gmail.com> (raw)
In-Reply-To: <1416855973-6359-1-git-send-email-treestem@gmail.com>
If extsize is set and new_last_fsb is larger than 32 bits, the
roundup to extsize will overflow the align variable. Instead,
combine alignments by rounding stripe size up to extsize.
Signed-off-by: Peter Watkins <treestem@gmail.com>
Reviewed-by: Nathaniel W. Turner <nate@houseofnate.net>
---
fs/xfs/xfs_iomap.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index afcf3c9..3fad071 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -52,7 +52,6 @@ xfs_iomap_eof_align_last_fsb(
xfs_extlen_t extsize,
xfs_fileoff_t *last_fsb)
{
- xfs_fileoff_t new_last_fsb = 0;
xfs_extlen_t align = 0;
int eof, error;
@@ -70,8 +69,8 @@ xfs_iomap_eof_align_last_fsb(
else if (mp->m_dalign)
align = mp->m_dalign;
- if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align))
- new_last_fsb = roundup_64(*last_fsb, align);
+ if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
+ align = 0;
}
/*
@@ -79,14 +78,14 @@ xfs_iomap_eof_align_last_fsb(
* (when file on a real-time subvolume or has di_extsize hint).
*/
if (extsize) {
- if (new_last_fsb)
- align = roundup_64(new_last_fsb, extsize);
+ if (align)
+ align = roundup_64(align, extsize);
else
align = extsize;
- new_last_fsb = roundup_64(*last_fsb, align);
}
- if (new_last_fsb) {
+ if (align) {
+ xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
if (error)
return error;
--
1.7.9.5
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next prev parent reply other threads:[~2014-12-01 22:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-24 19:06 [PATCH] xfs: overflow in xfs_iomap_eof_align_last_fsb Peter Watkins
2014-11-25 13:49 ` Brian Foster
2014-11-25 23:18 ` Dave Chinner
2014-12-01 22:45 ` Peter Watkins [this message]
2014-12-02 16:24 ` [PATCH v2] " Brian Foster
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