I am monitoring file operations events (VFS).
I have a problem with BTRFS filesystem. BTRFS is using subvolumes. All highest hierarchy directories in btrfs has the same inode (256/512)
When I receive file operation event, I receive the path and then resolve it to inode.
By resolving I mean: given a path, I get its dentry (user_path() call), from dentry i pull: dEntry->d_inode->i_ino
The problem is I receive same inode for different directories on the same Device.
I guess, BTRFS has some sort of abstraction layer, that create a "virtual" inode number (the identical ones are virtual) - there is no way for two identical inodes on same device id.
Proof for device id issue:
From kernel I receive device id 29:
From user space:
So I get 29 and 33 as device id.
Lets call device id 29 "actual id"", and 33 is "virtual id".
Is there a way to obtain the actual id from kernel code ? I am looking for replacement to dEntry->d_inode->i_sb->s_dev.. to obtain the same id as we receive from user mode.
Please wrap all code, data, files, input & output/errors in CODE tags.
It make it far easier to read and preservers spaces for indenting or fixed width data.
I have guessed what to add in. Perhaps you could edit this post and confirm what it should be.
Last edited by rbatte1; 02-15-2017 at 11:55 AM..
Reason: Added CODE tags
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