The *_state functions can only return 0 or -EEXIST. This patch addresses
the cases where those functions return -EEXIST, representing a locking
failure. It handles them by panicking with an appropriate error message.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/btrfs/extent_io.c | 42 +++++++++++++++++++++++++++++++-----------
1 file changed, 31 insertions(+), 11 deletions(-)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -51,6 +51,12 @@ struct extent_page_data {
unsigned int sync_io:1;
};
+static inline struct btrfs_fs_info *
+tree_fs_info(struct extent_io_tree *tree)
+{
+ return btrfs_sb(tree->mapping->host->i_sb)->fs_info;
+}
+
int __init extent_io_init(void)
{
extent_state_cache = kmem_cache_create("extent_state",
@@ -531,7 +537,10 @@ hit_next:
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
err = split_state(tree, state, prealloc, start);
- BUG_ON(err == -EEXIST);
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
prealloc = NULL;
if (err)
goto out;
@@ -553,7 +562,10 @@ hit_next:
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
err = split_state(tree, state, prealloc, end + 1);
- BUG_ON(err == -EEXIST);
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
if (wake)
wake_up(&state->wq);
@@ -736,8 +748,11 @@ again:
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
err = insert_state(tree, prealloc, start, end, &bits);
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
prealloc = NULL;
- BUG_ON(err == -EEXIST);
goto out;
}
state = rb_entry(node, struct extent_state, rb_node);
@@ -803,7 +818,10 @@ hit_next:
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
err = split_state(tree, state, prealloc, start);
- BUG_ON(err == -EEXIST);
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
prealloc = NULL;
if (err)
goto out;
@@ -840,12 +858,11 @@ hit_next:
*/
err = insert_state(tree, prealloc, start, this_end,
&bits);
- BUG_ON(err == -EEXIST);
- if (err) {
- free_extent_state(prealloc);
- prealloc = NULL;
- goto out;
- }
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
+
cache_state(prealloc, cached_state);
prealloc = NULL;
start = this_end + 1;
@@ -867,7 +884,10 @@ hit_next:
prealloc = alloc_extent_state_atomic(prealloc);
BUG_ON(!prealloc);
err = split_state(tree, state, prealloc, end + 1);
- BUG_ON(err == -EEXIST);
+ if (err)
+ btrfs_panic(tree_fs_info(tree), err, "Locking error: "
+ "Extent tree was modified by another "
+ "thread while locked.");
set_state_bits(tree, prealloc, &bits);
cache_state(prealloc, cached_state);
--
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