[stable-34.0] fix(filesystem): do not attempt to lock directories on Windows - #10504
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LockFile() locks a byte range within a file and is not supported for directory handles, where it always fails with ERROR_INVALID_PARAMETER. FILE_FLAG_BACKUP_SEMANTICS lets CreateFileW() open directories, so isFileLocked() reached that failing call for every directory and logged a warning for each one. Discovery checks every entry, directories included, so a sync run logged one bogus warning per directory. On large folder trees those warnings dominate the log volume, and the resulting log rotation discards the records needed to diagnose actual problems. Return the opened handle for directories instead of attempting the lock. CreateFileW() still runs, so a directory held with deny-sharing is still reported as locked; only the attempt that cannot succeed is gone. Measured on a synced folder with 82464 directories, same build and configuration: a full discovery run logged 83189 of these warnings without this change and none with it. The added test covers both halves and fails without the fix. Test suite green on Windows (70 tests). For #10444 Assisted-by: Claude Code:claude-opus-5 Signed-off-by: Andreas Bohl <ab@eeloy.com>
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July 31, 2026 08:07
nilsding
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Artifact containing the AppImage: nextcloud-appimage-pr-10504.zip Digest: To test this change/fix you can download the above artifact file, unzip it, and run it. Please make sure to quit your existing Nextcloud app and backup your data. |
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Backport of PR #10487