summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_buf_item.c
diff options
context:
space:
mode:
authorDave Chinner <dchinner@redhat.com>2021-03-22 09:52:04 -0700
committerDarrick J. Wong <djwong@kernel.org>2021-03-25 16:47:51 -0700
commitc81ea11e033221a94182e1d0fee303def944303a (patch)
treeef417e128195d9a24b60e84ca7b574352ab0f9f4 /fs/xfs/xfs_buf_item.c
parentaccc661bf99a47b93ecb5fe0ed3fefd5d8b505ef (diff)
xfs: xfs_buf_item_size_segment() needs to pass segment offset
Otherwise it doesn't correctly calculate the number of vectors in a logged buffer that has a contiguous map that gets split into multiple regions because the range spans discontigous memory. Probably never been hit in practice - we don't log contiguous ranges on unmapped buffers (inode clusters). Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/xfs/xfs_buf_item.c')
-rw-r--r--fs/xfs/xfs_buf_item.c38
1 files changed, 19 insertions, 19 deletions
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index cb8fd8afd140..189a4534e0b2 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -55,6 +55,18 @@ xfs_buf_log_format_size(
(blfp->blf_map_size * sizeof(blfp->blf_data_map[0]));
}
+static inline bool
+xfs_buf_item_straddle(
+ struct xfs_buf *bp,
+ uint offset,
+ int next_bit,
+ int last_bit)
+{
+ return xfs_buf_offset(bp, offset + (next_bit << XFS_BLF_SHIFT)) !=
+ (xfs_buf_offset(bp, offset + (last_bit << XFS_BLF_SHIFT)) +
+ XFS_BLF_CHUNK);
+}
+
/*
* This returns the number of log iovecs needed to log the
* given buf log item.
@@ -69,6 +81,7 @@ STATIC void
xfs_buf_item_size_segment(
struct xfs_buf_log_item *bip,
struct xfs_buf_log_format *blfp,
+ uint offset,
int *nvecs,
int *nbytes)
{
@@ -103,12 +116,8 @@ xfs_buf_item_size_segment(
*/
if (next_bit == -1) {
break;
- } else if (next_bit != last_bit + 1) {
- last_bit = next_bit;
- (*nvecs)++;
- } else if (xfs_buf_offset(bp, next_bit * XFS_BLF_CHUNK) !=
- (xfs_buf_offset(bp, last_bit * XFS_BLF_CHUNK) +
- XFS_BLF_CHUNK)) {
+ } else if (next_bit != last_bit + 1 ||
+ xfs_buf_item_straddle(bp, offset, next_bit, last_bit)) {
last_bit = next_bit;
(*nvecs)++;
} else {
@@ -142,8 +151,10 @@ xfs_buf_item_size(
int *nbytes)
{
struct xfs_buf_log_item *bip = BUF_ITEM(lip);
+ struct xfs_buf *bp = bip->bli_buf;
int i;
int bytes;
+ uint offset = 0;
ASSERT(atomic_read(&bip->bli_refcount) > 0);
if (bip->bli_flags & XFS_BLI_STALE) {
@@ -185,8 +196,9 @@ xfs_buf_item_size(
*/
bytes = 0;
for (i = 0; i < bip->bli_format_count; i++) {
- xfs_buf_item_size_segment(bip, &bip->bli_formats[i],
+ xfs_buf_item_size_segment(bip, &bip->bli_formats[i], offset,
nvecs, &bytes);
+ offset += BBTOB(bp->b_maps[i].bm_len);
}
/*
@@ -213,18 +225,6 @@ xfs_buf_item_copy_iovec(
nbits * XFS_BLF_CHUNK);
}
-static inline bool
-xfs_buf_item_straddle(
- struct xfs_buf *bp,
- uint offset,
- int next_bit,
- int last_bit)
-{
- return xfs_buf_offset(bp, offset + (next_bit << XFS_BLF_SHIFT)) !=
- (xfs_buf_offset(bp, offset + (last_bit << XFS_BLF_SHIFT)) +
- XFS_BLF_CHUNK);
-}
-
static void
xfs_buf_item_format_segment(
struct xfs_buf_log_item *bip,