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Disable unsafe kernel caching for --reverse

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By default, the kernel caches file metadata for one second.
This is fine for EncFS' normal mode, but for --reverse, this
means that the encrypted view will be up to one second out of
date.
This causes the reverse grow tests to fail because stale stat()
data is returned.
This commit is contained in:
Jakob Unterwurzacher 2014-11-17 00:03:38 +01:00
parent a00a3beb8e
commit 84dae17d4e
1 changed files with 16 additions and 0 deletions
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16
encfs/main.cpp
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@ -274,6 +274,22 @@ static bool processArgs(int argc, char *argv[],
break;
case 'r':
out->opts->reverseEncryption = true;
/* By default, the kernel caches file metadata for one second.
* This is fine for EncFS' normal mode, but for --reverse, this
* means that the encrypted view will be up to one second out of
* date.
* Quoting Goswin von Brederlow:
* "Caching only works correctly if you implement a disk based
* filesystem, one where only the fuse process can alter
* metadata and all access goes only through fuse. Any overlay
* filesystem where something can change the underlying
* filesystem without going through fuse can run into
* inconsistencies."
* Disable caching so the encrypted view stays consistent with
* the backing files. */
PUSHARG("-oattr_timeout=0"); // Causes reverse grow tests to fail
// because stale stat() data is returned
PUSHARG("-oentry_timeout=0"); // Fallout unknown, disabling for safety
break;
case 'm':
out->opts->mountOnDemand = true;