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-rw-r--r--fs/btrfs/ioctl.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 38f2169b73a4..f0b4237cedfc 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3020,7 +3020,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode,
/* clone data */
key.objectid = btrfs_ino(src);
key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = 0;
+ key.offset = off;
while (1) {
/*
@@ -3032,6 +3032,17 @@ static int btrfs_clone(struct inode *src, struct inode *inode,
0, 0);
if (ret < 0)
goto out;
+ /*
+ * First search, if no extent item that starts at offset off was
+ * found but the previous item is an extent item, it's possible
+ * it might overlap our target range, therefore process it.
+ */
+ if (key.offset == off && ret > 0 && path->slots[0] > 0) {
+ btrfs_item_key_to_cpu(path->nodes[0], &key,
+ path->slots[0] - 1);
+ if (key.type == BTRFS_EXTENT_DATA_KEY)
+ path->slots[0]--;
+ }
nritems = btrfs_header_nritems(path->nodes[0]);
process_slot:
@@ -3081,10 +3092,16 @@ process_slot:
extent);
}
- if (key.offset + datal <= off ||
- key.offset >= off + len - 1) {
+ /*
+ * The first search might have left us at an extent
+ * item that ends before our target range's start, can
+ * happen if we have holes and NO_HOLES feature enabled.
+ */
+ if (key.offset + datal <= off) {
path->slots[0]++;
goto process_slot;
+ } else if (key.offset >= off + len) {
+ break;
}
size = btrfs_item_size_nr(leaf, slot);
@@ -3291,6 +3308,8 @@ process_slot:
goto out;
}
ret = btrfs_end_transaction(trans, root);
+ if (new_key.offset + datal >= destoff + len)
+ break;
}
btrfs_release_path(path);
key.offset++;
@@ -3298,7 +3317,6 @@ process_slot:
ret = 0;
out:
- btrfs_release_path(path);
btrfs_free_path(path);
vfree(buf);
return ret;