The 'end' value must exactly cover the end of the interval, which means
one byte less than the expected block alignment, or in case of a file
smaller than one block, one byte less than the inode size.
Signed-off-by: David Sterba <dsterba@xxxxxxx>
---
fs/btrfs/extent_io.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c4949f1..6f6beda 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -76,10 +76,29 @@ void btrfs_leak_debug_check(void)
kmem_cache_free(extent_buffer_cache, eb);
}
}
+
+#define btrfs_debug_check_extent_io_range(inode, start, end) \
+ __btrfs_debug_check_extent_io_range(__func__, (inode), (start), (end))
+static inline void __btrfs_debug_check_extent_io_range(const char *caller,
+ struct inode *inode, u64 start, u64 end)
+{
+ u64 isize = i_size_read(inode);
+
+ if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) {
+ printk_ratelimited(KERN_DEBUG
+ "btrfs: %s: ino %llu isize %llu odd range [%llu,%llu)\n",
+ caller,
+ (unsigned long long)btrfs_ino(inode),
+ (unsigned long long)isize,
+ (unsigned long long)start,
+ (unsigned long long)end);
+ }
+}
#else
#define btrfs_leak_debug_add(new, head) do {} while (0)
#define btrfs_leak_debug_del(entry) do {} while (0)
#define btrfs_leak_debug_check() do {} while (0)
+#define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0)
#endif
#define BUFFER_LRU_MAX 64
@@ -509,6 +528,8 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
int err;
int clear = 0;
+ btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+
if (delete)
bits |= ~EXTENT_CTLBITS;
bits |= EXTENT_FIRST_DELALLOC;
@@ -664,6 +685,8 @@ static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state *state;
struct rb_node *node;
+ btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+
spin_lock(&tree->lock);
again:
while (1) {
@@ -756,6 +779,8 @@ __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
u64 last_start;
u64 last_end;
+ btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+
bits |= EXTENT_FIRST_DELALLOC;
again:
if (!prealloc && (mask & __GFP_WAIT)) {
@@ -976,6 +1001,8 @@ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
u64 last_start;
u64 last_end;
+ btrfs_debug_check_extent_io_range(tree->mapping->host, start, end);
+
again:
if (!prealloc && (mask & __GFP_WAIT)) {
prealloc = alloc_extent_state(mask);
--
1.7.9
--
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