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fix #3580: plugins: make preallocation mode selectable for qcow2 and raw images

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the plugins for file based storages
 * BTRFS
 * CIFS
 * Dir
 * Glusterfs
 * NFS
now allow the option 'preallocation'.

'preallocation' can have four values:
 * default
 * off
 * metadata
 * falloc
 * full
see man pages for `qemu-img` for what these mean exactly. [0]

the defualt value was chosen to be
 * qcow2: metadata (as previously)
 * raw: off

when using 'metadata' as preallocation mode, for raw images 'off'
is used.

[0] https://qemu.readthedocs.io/en/latest/system/images.html#disk-image-file-formats

Signed-off-by: Lorenz Stechauner <l.stechauner@proxmox.com>
Reviewed-by: Fabian Ebner <f.ebner@proxmox.com>
Tested-by: Fabian Ebner <f.ebner@proxmox.com>
This commit is contained in:
Lorenz Stechauner
2021-10-12 14:32:32 +02:00
committed by Thomas Lamprecht
parent 2caa1194e9
commit 95ff5dbd64
6 changed files with 54 additions and 2 deletions
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PVE/Storage/NFSPlugin.pm
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@ -90,6 +90,7 @@ sub options {
format => { optional => 1 },
mkdir => { optional => 1 },
bwlimit => { optional => 1 },
preallocation => { optional => 1 },
};
}