Messages in this thread | | | Subject | Re: [Question] how to follow a symlink via a dentry? | From | Steven Rostedt <> | Date | Tue, 23 May 2006 16:56:10 -0400 |
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On Tue, 2006-05-23 at 10:08 -0700, Stephen Hemminger wrote: > On Tue, 23 May 2006 12:56:03 -0400 > Steven Rostedt <rostedt@goodmis.org> wrote: > > > What is the best way from inside the kernel, to find the dentry that > > another dentry points to via symlink? > > > > Scenario: > > > > I have a kobj of a device in the sysfs system. Inside a directory of > > the kobj, is a symlink to another device I need to get. I can find the > > dentry of the symlink, but I haven't found a good way to get to the > > dentry of what the symlink points to. > > > > Is there a standard way to do this, or do I need to start hacking at the > > follow_link of the sysfs directory to get what I want? > > > > Do I need to hack up something like page_readlink to get the path, and > > then do vfs_follow_link to get the rest. Another thing is that I can't > > rely on what current->fs points to. > > > > Thanks, > > > > -- Steve > > > > Sysfs reflects kernel object linkage, you should not be using > file access to find kernel objects. You should use the pointers > instead.
What pointers are you talking about? Let me ask a better question. If I have a pointer to an ide_drive_t or ide_driver_t or just the struct device, how do I get to the block_device (bdev) that points to it?
So I have the /sys/block/hda/device object (which really is a symlink to the /sys/devices/...) but I want to get to the object that represents /sys/block/hda/device/block:hda which is also a symlink back to /sys/block/hda. Right now the only way I know to do that is to follow the sysfs.
-- Steve
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