linux-ext4 - FALLOC_FL_COLLAPSE_RANGE crash guarantees

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Message-Id: <E592DDCD-E4A1-4E9B-BEAA-1D454F0D4889@yandex-team.ru>
Date:   Thu, 20 Aug 2020 16:42:51 +0500
From:   Petr Gusev <gusev-p@...dex-team.ru>
To:     linux-ext4@...r.kernel.org
Subject: FALLOC_FL_COLLAPSE_RANGE crash guarantees

Hello!

I’m considering FALLOC_FL_COLLAPSE_RANGE for app log rotation and is wondering what I can get in the case of hard reset/power loss. Is it true that the hole with garbage can appear in the middle of a file? Fs mount options is 'rw,noatime,data=ordered'.