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My project involves simulating a block device by remote host.
For testing I am using FUSE, my file system is a simple change of the "hello" example app, where instead of returning a constant string I just read data directly from a file.
When I try to mount the file normally (mount -o loop=/dev/loop1 ) it works well. When I load fuse and expose this file via it, all the normal file operations work. But mounting fails with "Permission denied".
Anyone has an idea where the "permission denied" is coming from ?
Any other methods to that will allow me to create a virtual device (only support block access) in users space, that will be mountable ?
Thanks in advance
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Block devices are nonvolatile mass storage devices whose information can be accessed in any order. Hard disks, floppy disks, and CD-ROMs are examples of block devices.
The block devices on a system can be discovered with the lsblk (list block devices) command. Try it in the VM below. Type lsblk at the command prompt and then press Enter.
The blkid program is the command-line interface to working with the libblkid(3) library. It can determine the type of content (e.g., filesystem or swap) that a block device holds, and also the attributes (tokens, NAME=value pairs) from the content metadata (e.g., LABEL or UUID fields).
Lsblk is used to display details about block devices and these block devices(Except ram disk) are basically those files that represent devices connected to the pc. It queries /sys virtual file system and udev db to obtain information that it displays. And it basically displays output in a tree-like structure.
Presumably the problem is that the FUSE filesystem doesn't support the features required to have loop-mounts on it.
Have you considered using a network block device instead, such as NBD or iSCSI target?
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