XFS

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Le système de fichiers XFS un système de fichiers journalisé de haute performance. Il est compatible liste de contrôle d'accès (POSIX) pour une utilisation avec Linux.

Installation

Noyau

KERNEL Activer le support du XFS (CONFIG_XFS_FS:)

File systems  --->
   <*> XFS filesystem support

Optionnel :

KERNEL Activer les fonctionnalités optionnelles du XFS

File systems  --->
   [*]   XFS Quota support
   [*]   XFS POSIX ACL support
   [*]   XFS Realtime subvolume support
   [ ]   XFS Verbose Warnings
   [ ]   XFS Debugging support

Installation

Le paquet sys-fs/xfsprogs est requis pour avoir les utilitaires XFS :

root #emerge --ask sys-fs/xfsprogs

Utilisation

Monter un système de fichiers XFS avec la commande mount.

Year 2038 timestamp support (bigtime)

Beginning with kernel 5.10, XFS gained bigtime support to extend the maximum recorded date stamps from 2038 to 2486 for the V5 on-disk format.

Initially, this was marked as experimental until kernel 5.15 removed that verbiage after a year of testing.

bigtime option can be enabled at creation time or upgraded after the fact. Once enabled and written to, it should not be removed.

To enable at format time, add the -m bigtime=1 option to mkfs.xfs

To check the status:

root #xfs_info / |grep bigtime

         =                       reflink=1    bigtime=1 inobtcount=0

To upgrade to bigtime, first cleanly unmount the file system. The upgrade will refuse to run if the unmount was not completely clean.

Then run:

root #xfs_admin -O bigtime=1 /dev/sda1

Replacing /dev/sda1 with the device path.

Note
XFS on the root mount will require an initramfs or other live environment with the necessary tools to perform an upgrade to the metadata.

Using Dracut initramfs to perform the upgrade

First, Dracut needs additional files included in the initramfs in order to perform the upgrade. This can be accomplished with either the --install option or inside a configuration file using the install_items option.

root #dracut --install "/usr/sbin/xfs_admin /usr/bin/expr" ...

Then, the kernel command line option can be modified to include rd.break=premount to stop the initramfs just before it would mount the root filesystem. Ensure this is done temporarily and removed on subsequent reboots after upgrade.

Suppression

Afin de planifier la suppression au prochain lancement :

root #emerge --ask --depclean --verbose sys-fs/xfsprogs

Voir aussi

• FAT — originally created for use with MS-DOS (and later pre-NT Microsoft Windows)
• Ext4 — an open source disk filesystem and most recent version of the extended series of filesystems.
• Btrfs — un système de fichiers fondé sur le copie sur écriture (CoW) pour Linux visant à implémenter des fonctionnalités complexes tout en mettant l'accent sur la tolérance aux pannes, la réparation et la facilité d'administration.