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authorDave Chinner <dchinner@redhat.com>2014-02-10 10:37:18 +1100
committerDave Chinner <david@fromorbit.com>2014-02-10 10:37:18 +1100
commit3895e51f6dbf6610519be070a3bede811f6ac4fb (patch)
tree30e465d362e605c15490c4b224c930d10d6a3194 /fs
parentfe60a8a0919eeee862054137fed49f00b710d9cd (diff)
downloadblackbird-op-linux-3895e51f6dbf6610519be070a3bede811f6ac4fb.tar.gz
blackbird-op-linux-3895e51f6dbf6610519be070a3bede811f6ac4fb.zip
xfs: ensure correct log item buffer alignment
On 32 bit platforms, the log item vector headers are not 64 bit aligned or sized. hence if we don't take care to align them correctly or pad the buffer appropriately for 8 byte alignment, we can end up with alignment issues when accessing the user buffer directly as a structure. To solve this, simply pad the buffer headers to 64 bit offset so that the data section is always 8 byte aligned. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reported-by: Michael L. Semon <mlsemon35@gmail.com> Tested-by: Michael L. Semon <mlsemon35@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_log_cil.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index cdebd832c3db..4ef6fdbced78 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -205,16 +205,25 @@ xlog_cil_insert_format_items(
/*
* We 64-bit align the length of each iovec so that the start
* of the next one is naturally aligned. We'll need to
- * account for that slack space here.
+ * account for that slack space here. Then round nbytes up
+ * to 64-bit alignment so that the initial buffer alignment is
+ * easy to calculate and verify.
*/
nbytes += niovecs * sizeof(uint64_t);
+ nbytes = round_up(nbytes, sizeof(uint64_t));
/* grab the old item if it exists for reservation accounting */
old_lv = lip->li_lv;
- /* calc buffer size */
- buf_size = sizeof(struct xfs_log_vec) + nbytes +
- niovecs * sizeof(struct xfs_log_iovec);
+ /*
+ * The data buffer needs to start 64-bit aligned, so round up
+ * that space to ensure we can align it appropriately and not
+ * overrun the buffer.
+ */
+ buf_size = nbytes +
+ round_up((sizeof(struct xfs_log_vec) +
+ niovecs * sizeof(struct xfs_log_iovec)),
+ sizeof(uint64_t));
/* compare to existing item size */
if (lip->li_lv && buf_size <= lip->li_lv->lv_size) {
@@ -251,6 +260,8 @@ xlog_cil_insert_format_items(
/* The allocated data region lies beyond the iovec region */
lv->lv_buf_len = 0;
lv->lv_buf = (char *)lv + buf_size - nbytes;
+ ASSERT(IS_ALIGNED((unsigned long)lv->lv_buf, sizeof(uint64_t)));
+
lip->li_ops->iop_format(lip, lv);
insert:
ASSERT(lv->lv_buf_len <= nbytes);
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