This document contains a list of tasty^W handy recipes for developing Fuchsia's storage stack. The intended audience is members of the Storage team, filesystem developers, et cetera.
touch /tmp/blk.bin truncate /tmp/blk.bin $((1024 * 1024 * 64)) fx qemu -kN -- -drive file=/tmp/blk.bin,index=0,media=disk,cache=directsync
The above 64M block device will then appear as a block device in Fuchsia (and can be found using lsblk
).
Note that this is destructive and can only be done on a block device which isn't currently mounted.
Note: These commands are all run from the Fuchsia shell.
# First, find the path to the block device. lsblk ... 001 64M /dev/sys/platform/pci/00:1f.2/ahci/sata0/block ... # Format it! mkfs /dev/sys/platform/pci/00:1f.2/ahci/sata0/block <fs_type>
A limited version of command line filesystem mounting is supported on Fuchsia for debugging purposes. The mount command can launch filesystems and place them in the /mnt
directory, where they can be accessed with that path prefix.
Note that this can only be done on a block device which isn't currently mounted, and which is formatted appropriately.
Note: These commands are all run from the Fuchsia shell.
# First, find the block device. lsblk ... 001 64M /dev/sys/platform/pci/00:1f.2/ahci/sata0/block ... # Mount it! mount /dev/sys/platform/pci/00:1f.2/ahci/sata0/block /mnt/minfs # Use it! echo "hello world!" >> /mnt/minfs/file mkdir /mnt/minfs/dir cat /mnt/minfs/file ls /mnt/minfs # When you're done, you can unmount it. umount /mnt/minfs
$ IMAGE_SIZE=… fx qemu …