diff options
| author | Dave Chinner <dchinner@redhat.com> | 2021-03-22 09:52:04 -0700 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-03-25 16:47:51 -0700 |
| commit | c81ea11e033221a94182e1d0fee303def944303a (patch) | |
| tree | ef417e128195d9a24b60e84ca7b574352ab0f9f4 /fs/xfs/xfs_buf_item.c | |
| parent | accc661bf99a47b93ecb5fe0ed3fefd5d8b505ef (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.c | 38 |
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, |