diff options
| author | Yan Zheng <zheng.yan@oracle.com> | 2009-05-27 09:16:03 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-06-10 11:29:46 -0400 |
| commit | 5c939df56c3ea018b58e5aa76181284c2053d699 (patch) | |
| tree | 6d97449faa69c96998833fcb56a3b65050d34354 | |
| parent | 07a2039b8eb0af4ff464efd3dfd95de5c02648c6 (diff) | |
btrfs: Fix set/clear_extent_bit for 'end == (u64)-1'
There are some 'start = state->end + 1;' like code in set_extent_bit
and clear_extent_bit. They overflow when end == (u64)-1.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index fe9eb990e443..68260180f587 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -476,6 +476,7 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state *state; struct extent_state *prealloc = NULL; struct rb_node *node; + u64 last_end; int err; int set = 0; @@ -498,6 +499,7 @@ again: if (state->start > end) goto out; WARN_ON(state->end < start); + last_end = state->end; /* * | ---- desired range ---- | @@ -524,9 +526,11 @@ again: if (err) goto out; if (state->end <= end) { - start = state->end + 1; set |= clear_state_bit(tree, state, bits, wake, delete); + if (last_end == (u64)-1) + goto out; + start = last_end + 1; } else { start = state->start; } @@ -552,8 +556,10 @@ again: goto out; } - start = state->end + 1; set |= clear_state_bit(tree, state, bits, wake, delete); + if (last_end == (u64)-1) + goto out; + start = last_end + 1; goto search_again; out: @@ -707,8 +713,10 @@ again: goto out; } set_state_bits(tree, state, bits); - start = state->end + 1; merge_state(tree, state); + if (last_end == (u64)-1) + goto out; + start = last_end + 1; goto search_again; } @@ -742,8 +750,10 @@ again: goto out; if (state->end <= end) { set_state_bits(tree, state, bits); - start = state->end + 1; merge_state(tree, state); + if (last_end == (u64)-1) + goto out; + start = last_end + 1; } else { start = state->start; } |