[Btrfs-devel] Layout of sysfs

[Josef Bacik]

Hello,

How do you want me to do this?  I started writing stuff and then realized I've
got two options

1) for every superblock we create a directory inside /sys/fs/btrfs with the
sb->s_id (so the device name), and then in there we have the random info like
blocks_used, total_blocks, etc.  Then for every subvol/snapshot created inside
that super block (ie every btrfs_root item associated with that super_block) we
have another sysfs directory, with all of its individual information, and do
something ugly like root->inode->i_dentry->d_name.name for the name of the
directory.  The only problem I'm having with this is where to store the kobj for
the super_block.  I could keep a running list of the super_block kobj's within
the sysfs code, or change btrfs_super_block into btrfs_super_block_item and make
a seperate btrfs_super_block struct for the in memory superblock.

2) ignore the superblock, and just create sysfs directories for the
btrfs_root's.  This means the only ugly thing we are doing is getting the root
item's name, we dont have to do all the weird stuff to keep track of the super
block, but we lose the ability to report certain things about the superblock
(not that I think that matters too much b/c df and such should take care of all
of that anyway).

Let me know which way you want to go and I'll do whats needed.

Josef

P.S. is there a public IRC channel/AIM/gtalk/anything I can reach you on so I
don't have to send all these quick question emails?