From: John Garry john.g.garry@oracle.com
maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9VTE3 CVE: NA
Reference: https://lore.kernel.org/linux-xfs/20240705162450.3481169-1-john.g.garry@orac...
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In xfs_bmap_process_allocated_extent(), for when we found that we could not provide the requested length completely, the mapping is moved so that we can provide as much as possible for the original request.
For forcealign, this would mean ignoring alignment guaranteed, so don't do this.
Reviewed-by: "Darrick J. Wong" djwong@kernel.org Signed-off-by: John Garry john.g.garry@oracle.com Signed-off-by: Long Li leo.lilong@huawei.com --- fs/xfs/libxfs/xfs_bmap.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 284cc73b8bef..35728779b0d6 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3686,10 +3686,12 @@ xfs_bmap_btalloc( * very fragmented so we're unlikely to be able to satisfy the * hints anyway. */ - if (ap->length <= orig_length) - ap->offset = orig_offset; - else if (ap->offset + ap->length < orig_offset + orig_length) - ap->offset = orig_offset + orig_length - ap->length; + if (!(xfs_inode_forcealign(ap->ip) && align)) { + if (ap->length <= orig_length) + ap->offset = orig_offset; + else if (ap->offset + ap->length < orig_offset + orig_length) + ap->offset = orig_offset + orig_length - ap->length; + } xfs_bmap_btalloc_accounting(ap, &args); } else { ap->blkno = NULLFSBLOCK;