Unable to repair disk (Partition map) Please HELP !

Hi,
I have the weirdest problem with my 15" retina macbook pro.
Earlier today, OS X automatically rebooted after some kind of bug. I was then unable to start the computer, wether it was through recovery or as usual.
Started in Safe mode, Backed up with time machine, and restored system.
I'm now able to boot as usual but when I launch Disk Utility, I detects an error. Please find DU log at end of this message.
When I click Repair Disk, I continuously get the same error message (this disk needs to be repaired).
Any ideas how I can get this error fixed ?
Thanks so much !
2015-02-14 19:10:03 +0100: Verifying and repairing partition map for “APPLE SSD SM1024F Media”
2015-02-14 19:10:03 +0100: Starting repair tool:
2015-02-14 19:10:03 +0100: Checking prerequisites
2015-02-14 19:10:03 +0100: Checking the partition list
2015-02-14 19:10:03 +0100: Adjusting partition map to fit whole disk as required
2015-02-14 19:10:03 +0100: Checking for an EFI system partition
2015-02-14 19:10:03 +0100: Checking the EFI system partition’s size
2015-02-14 19:10:03 +0100: Checking the EFI system partition’s file system
2015-02-14 19:10:03 +0100: Checking all HFS data partition loader spaces
2015-02-14 19:10:03 +0100: Checking booter partitions
2015-02-14 19:10:03 +0100: Checking booter partition disk0s3
2015-02-14 19:10:03 +0100: Repairing file system.
2015-02-14 19:10:03 +0100: Checking Journaled HFS Plus volume.
2015-02-14 19:10:03 +0100: Invalid number of allocation blocks
2015-02-14 19:10:03 +0100: The volume could not be verified completely.
2015-02-14 19:10:03 +0100: File system check exit code is 8.
2015-02-14 19:10:03 +0100: Updating boot support partitions for the volume as required.
2015-02-14 19:10:03 +0100: Reviewing boot support loaders
2015-02-14 19:10:03 +0100: Checking Core Storage Physical Volume partitions
2015-02-14 19:10:04 +0100: Updating Windows boot.ini files as required
2015-02-14 19:10:04 +0100: Problems were encountered during repair of the partition map
2015-02-14 19:10:04 +0100: Error: This disk needs to be repaired. Click Repair Disk.

If you have a backup (for both OS's: OS X and Windows) you might try with booting to single user mode and use fsck tool: Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support
But if that would be my own mac i would probably create myself a Recovery USB Disk or Bootable OS Yosemite Installer Disk and repartition my Hard Drive and then reinstall OS X and restore data to it. If Disk Utility is reporting an issue with Partition Map Scheme i would be a bit anxious about my data stored on this drive...
Mac Basics: Time Machine backs up your Mac - Apple Support
OS X: About Recovery Disk Assistant - Apple Support
Create a bootable installer for OS X Mavericks or Yosemite - Apple Support
How to move data to your new Mac using Mountain Lion and earlier - Apple Support also Yosemite

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