diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/send.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index a1216f9b4917..5cf7838fb5e5 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -1158,6 +1158,9 @@ struct backref_ctx { /* 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; }; @@ -1221,7 +1224,7 @@ static int __iterate_backrefs(u64 ino, u64 offset, u64 root, void *ctx_) if (ret < 0) return ret; - if (offset + bctx->extent_len > i_size) + if (offset + bctx->data_offset + bctx->extent_len > i_size) return 0; /* @@ -1363,6 +1366,19 @@ static int find_extent_clone(struct send_ctx *sctx, 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. |