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btrfs: add debug check for extent_io range alignment 

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@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
hifive-unleashed-5.1
David Sterba 2013-04-30 15:22:23 +00:00 committed by Josef Bacik
parent 15b0a89d71
commit 8d599ae1bf
1 changed files with 27 additions and 0 deletions
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27
fs/btrfs/extent_io.c
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@ -77,10 +77,29 @@ 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
@ -522,6 +541,8 @@ 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;
@ -677,6 +698,8 @@ 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) {
@ -769,6 +792,8 @@ __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)) {
@ -989,6 +1014,8 @@ 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);