Disk I/O error when device is locked

[Dave005]

Hi,

i get the following error if i write to the database when the device is locked:
Unknown error calling sqlite3_step (10: disk I/O error)

i works fine if the app is in running in the background without locking the device.

I'v tried to set the file protection to none with the following code:

currentDB = [FMDatabase databaseWithPath: pathToDatabase];
[[NSFileManager defaultManager] setAttributes:[NSDictionary dictionaryWithObject:NSFileProtectionNone forKey:NSFileProtectionKey] ofItemAtPath: pathToDatabase error:&error];

but it will still raise the same error.

Is there something i'm missing ?

[purdyk]

I'm also seeing this problem. On a very limited set of devices, I am unable to write to my database when the device is locked in background mode.

[purdyk]

I have tracked down this issue. You'll need to set your fileprotection when you open the database.
Add the following flag to the open call for the database:

SQLITE_OPEN_FILEPROTECTION_NONE

in your case,

currentDB = [FMDatabase databaseWithPath:pathToDatabase];
[currentDB openWithFlags:SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FILEPROTECTION_NONE];

[Dave005]

thanks, i tried setting the file protection at the db file.
I will try ist with your flags !

[ccgus]

Well this is interesting, I've not encountered these flags before. Here's a relevant post from an apple mailing list: http://lists.apple.com/archives/cocoa-dev/2012/Aug/msg00527.html

[rodmaz]

This still does not work in our tests. Even setting SQLITE_OPEN_FILEPROTECTION_NONE makes the file protected. Seems like a bug in SQLite as these flags and implementation was done by Apple.

    [self.dbQueue inDatabase:^(FMDatabase *db) {
        if ( ![db openWithFlags:(SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE | SQLITE_OPEN_FILEPROTECTION_NONE )] )
        {
            DDLogError(@"could not open local data storage database.");
        }
        else
        {
            NSError *fileAttributesError = nil;
            NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:[db databasePath] error:&fileAttributesError];
            DDLogVerbose(@"opened local database; %@; file attributes: %@", dbPathURL, fileAttributes);
        }
...

fileAttributes are:

{
    NSFileCreationDate = "2014-09-10 00:45:24 +0000";
    NSFileExtensionHidden = 0;
    NSFileGroupOwnerAccountID = 501;
    NSFileGroupOwnerAccountName = mobile;
    NSFileModificationDate = "2014-09-10 00:45:24 +0000";
    NSFileOwnerAccountID = 501;
    NSFileOwnerAccountName = mobile;
    NSFilePosixPermissions = 420;
    NSFileProtectionKey = NSFileProtectionComplete;
    NSFileReferenceCount = 1;
    NSFileSize = 0;
    NSFileSystemFileNumber = 16846;
    NSFileSystemNumber = 16777219;
    NSFileType = NSFileTypeRegular;
}

[rodmaz]

I can confirm this is an SQLite implementation bug at least on iOS 7.2.1 and iOS 8 (GM).

[purdyk]

We're not having any issues on iOS 7.0 - 8.0 using the following to initially open the database:

_database =
    [FMDatabaseQueue databaseQueueWithPath:dbPath
        flags:SQLITE_OPEN_READWRITE |
            SQLITE_OPEN_CREATE |
            SQLITE_OPEN_FILEPROTECTION_NONE];

It looks from your snippet that you're database has already been opened with the default flags.

[rodmaz]

We are having issues when the app runs in background and the device is locked, even though the protection is none.
Also the bug only occurs in INSERTs.

<Warning>: Unknown error calling sqlite3_step (14: unable to open database file) eu
<Warning>: DB Query: INSERT INTO test (testColumn) VALUES (:testColumn)
<Warning>: Unknown error finalizing or resetting statement (14: unable to open database file)
<Warning>: DB Query: INSERT INTO test (testColumn) VALUES (:testColumn)

SELECTs work just fine.

[Moncter]

If has passcode and device is locked,write to the database(file) will get disk I/O error.
For some device you can modify open flag(SQLITE_OPEN_FILEPROTECTION_NONE) to solve the problem.But this method is invalid in some other device.Then you can modify the upper directory FileProtection attribute, for example:

[[NSFileManager defaultManager] setAttributes:[NSDictionary dictionaryWithObject:NSFileProtectionNone forKey:NSFileProtectionKey] ofItemAtPath:[NSHomeDirectory() stringByAppendingFormat:@"/Documents"] error:NULL];

[javiergonzper]

@rodmaz I am having the same problem:

 <Warning>: Unknown error calling sqlite3_step (14: unable to open database file) eu
 <Warning>: DB Query: UPDATE control_songs_played SET songs_played = ? WHERE cloud_type = ?
 <Warning>: Unknown error finalizing or resetting statement (14: unable to open database file)

I tried to open the FMDatabaseQueue with:

 sharedDatabase = [[FMDatabaseQueue alloc] initWithPath:dbPath flags:SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE|SQLITE_OPEN_FILEPROTECTION_NONE];

And the problem still there.

I also tried to change the attribures of the folder that contains the SQLite file as said @Moncter that is Documents like in the example.

Any new idea?

[rodmaz]

The problem I had was that the DB was created somewhere else with invalid arguments.
Make sure the DB file is not there before you call databaseQueueWithPath.
Let me know if this does not help.

[javiergonzper]

Finally my problem was that I can not access to any file on the Sandbox. After a few minutes with the device locked I can not access to the Database but also I can not access to any file on my Sandbox so the problem was there.
I was making many calls to files that does not exist on the Sandbox finally I found the problem using Instruments.

Thanks for your help anyway @rodmaz

[Marviszhao]

@javiergonzper my problem was similar with yours ,I also can
not access to any file on my Sandbox after device was locked with passcode.did you solved your problem? Thanks.

[javiergonzper]

Hey @Marviszhao yes.
To fix it you have to give this attibute for any file that you add on your sandbox:

NSDictionary *fileAttributes = [NSDictionary dictionaryWithObject:NSFileProtectionNone forKey:NSFileProtectionKey];
if (![[NSFileManager defaultManager] setAttributes:fileAttributes ofItemAtPath:filePath error:nil]) {
    // Deal with the error
}

[Marviszhao]

@javiergonzper thanks for you advance, I set all file with that attibute and finally it worked！

[hamza1307]

hi , it work for me but i only can read from the database i can't write .does enyone have this problems ? plz help me i dont know what to do :( thank u

[Marviszhao]

@hamza1307 did you open database with @purdyk said
_database =
[FMDatabaseQueue databaseQueueWithPath:dbPath
flags:SQLITE_OPEN_READWRITE |
SQLITE_OPEN_CREATE |
SQLITE_OPEN_FILEPROTECTION_NONE];

[pateljigar1111]

thank you very much

[nemesis]

If used with SQLCipher, SQLITE_OPEN_FILEPROTECTION_NONE seems to be missing. Any idea on why is that?

[lqdncel]

Hi,

I got the following error if i write to the database when the device is locked,and my device system is iOS9.1
error message list:
Unknown error calling sqlite3_step (10: disk I/O error)
DB Query: begin exclusive transaction
Unknown error finalizing or resetting statement (10: disk I/O error)

i works fine if the app is in running in the background without locking the device.

I'v tried to set the file protection to none with the following code:

[[NSFileManager defaultManager] setAttributes:[NSDictionary dictionaryWithObject:NSFileProtectionNone forKey:NSFileProtectionKey] ofItemAtPath:document error:NULL];

_dataQueue = [FMDatabaseQueue databaseQueueWithPath:dbPath flags:SQLITE_OPEN_READWRITE |
SQLITE_OPEN_CREATE |
SQLITE_OPEN_FILEPROTECTION_NONE];

but it will still raise the same error.And I remember before iOS9.1 system, there have not been Appear this error.

Is there something i'm missing ?

[nemesis]

@lqdncel not sure that setting NSFileProtectionKey should actually set it. The documentation lists a handful of properties which can be changed by using setAttributes:ofItemAtPath:error but NSFileProtectionKey isn't listed there.

[smking1122]

has everybody fix this issue?
@nemesis , @lqdncel ,
I use the SQLCipher too, and I set the NSFileProtectionKey to the db file. Also set the _dataQueue = [FMDatabaseQueue databaseQueueWithPath:dbPath flags:SQLITE_OPEN_READWRITE |
SQLITE_OPEN_CREATE |
SQLITE_OPEN_FILEPROTECTION_NONE];

But unfortunately, this issue also exist.
Wait for some guy's help? thx. Also appreciated if you can send me the solution to [email protected].

[HEYRIX]

Yes it is。I'm find the answer...