diff options
| -rw-r--r-- | fs/btrfs/send.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index d1a04c0c576e..474ceebe67bd 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -6188,8 +6188,29 @@ static int send_write_or_clone(struct send_ctx *sctx, if (ret < 0) return ret; - if (clone_root->offset + num_bytes == info.size) + if (clone_root->offset + num_bytes == info.size) { + /* + * The final size of our file matches the end offset, but it may + * be that its current size is larger, so we have to truncate it + * to any value between the start offset of the range and the + * final i_size, otherwise the clone operation is invalid + * because it's unaligned and it ends before the current EOF. + * We do this truncate to the final i_size when we finish + * processing the inode, but it's too late by then. And here we + * truncate to the start offset of the range because it's always + * sector size aligned while if it were the final i_size it + * would result in dirtying part of a page, filling part of a + * page with zeroes and then having the clone operation at the + * receiver trigger IO and wait for it due to the dirty page. + */ + if (sctx->parent_root != NULL) { + ret = send_truncate(sctx, sctx->cur_ino, + sctx->cur_inode_gen, offset); + if (ret < 0) + return ret; + } goto clone_data; + } write_data: ret = send_extent_data(sctx, path, offset, num_bytes); |