MDEV-36270 mariabackup.incremental_compressed fails in 10.11+

[Thirunarayanan]

• The Jira issue number for this PR is: MDEV-36270

Description

Problem:

• During prepare of incremental backup, mariabackup does create new file in target directory with default file size of 4 * innodb_page_size. While applying .delta file to corresponding data file, it encounters the FSP_SIZE modification on page0 and tries to extend the file to the size which is 4 in our case. Since the table is in compressed row format, page_size for the table is 8k. This lead to shrinking of tablespace file from 65536 to

32768. This issue happens only in windows because os_file_set_size() doesn't check for the current size and shrinks the file.

Solution:

xtrabackup_apply_delta(): Check for the current size before doing setting size for the file.

How can this PR be tested?

./mtr mariabackup.incremental_compressed

Basing the PR against the correct MariaDB version

• This is a new feature or a refactoring, and the PR is based against the main branch.
• This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

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[dr-m]

This looks reasonable to me. Shouldn’t the target version be the earilest affected one (10.5)? We have seen this code fail in 10.4 about a year ago.