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Unlock when promoting to exclusive lock fails 

In certain cases changeLock to EXCLUSIVE fails
and throws LockedException. This leaves the
file locked as SHARED in file_put_contents,
which prevents retrying (because on second
call file_put_contents takes another SHARED
lock on the same file, and changeLock doesn't
allow more than a single SHARED lock to promote
to EXCLUSIVE).

To avoid this case, we catch the LockedException
and unlock before re-throwing.

Signed-off-by: Ashod Nakashian <ashod.nakashian@collabora.co.uk>
This commit is contained in:
Ashod Nakashian 2020-10-27 22:57:24 -04:00 committed by backportbot[bot]
parent 20885847c8
commit 7298d037b2
1 changed files with 7 additions and 1 deletions
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8
lib/private/Files/View.php
View File

@ -665,7 +665,13 @@ class View {
return false;
}
$this->changeLock($path, ILockingProvider::LOCK_EXCLUSIVE);
try {
$this->changeLock($path, ILockingProvider::LOCK_EXCLUSIVE);
} catch (\Exception $e) {
// Release the shared lock before throwing.
$this->unlockFile($path, ILockingProvider::LOCK_SHARED);
throw $e;
}
/** @var \OC\Files\Storage\Storage $storage */
[$storage, $internalPath] = $this->resolvePath($path);