/* may be truncated in case it's the last extent in a file */
u64 extent_len;
+ /* data offset in the file extent item */
+ u64 data_offset;
+
/* Just to check for bugs in backref resolving */
int found_itself;
};
if (ret < 0)
return ret;
- if (offset + bctx->extent_len > i_size)
+ if (offset + bctx->data_offset + bctx->extent_len > i_size)
return 0;
/*
backref_ctx->cur_offset = data_offset;
backref_ctx->found_itself = 0;
backref_ctx->extent_len = num_bytes;
+ /*
+ * For non-compressed extents iterate_extent_inodes() gives us extent
+ * offsets that already take into account the data offset, but not for
+ * compressed extents, since the offset is logical and not relative to
+ * the physical extent locations. We must take this into account to
+ * avoid sending clone offsets that go beyond the source file's size,
+ * which would result in the clone ioctl failing with -EINVAL on the
+ * receiving end.
+ */
+ if (compressed == BTRFS_COMPRESS_NONE)
+ backref_ctx->data_offset = 0;
+ else
+ backref_ctx->data_offset = btrfs_file_extent_offset(eb, fi);
/*
* The last extent of a file may be too large due to page alignment.