Messages in this thread | | | Date | Mon, 26 Jan 2015 23:02:03 +0000 | From | Al Viro <> | Subject | Re: [PATCH 00/16 v3] tracing: Add new file system tracefs |
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On Mon, Jan 26, 2015 at 09:46:58PM +0000, Al Viro wrote: > On Mon, Jan 26, 2015 at 03:42:59PM -0500, Steven Rostedt wrote: > > On Mon, 26 Jan 2015 19:30:49 +0000 > > Al Viro <viro@ZenIV.linux.org.uk> wrote: > > > > > You are still fighting an inconvenient API, but now it's not debugfs one - > > > it's your copy thereof. Why not give your instances/ an inode_operations > > > of its own? One with ->mkdir() and ->rmdir(), leaving all other directories > > > as-is. That way you don't need the secondary methods at all. And sure, > > > debugfs_create_dir() grabs ->i_mutex on parent, making you drop that in > > > your ->mkdir() if you want to call it. But now you are not talking to it - > > > just to your own code, where you are free to change the calling conventions, > > > making it caller's responsibility to get that ->i_mutex. The same goes for > > > the rmdir side... > > > > The vfs layer grabs the i_mutex, which needs to be dropped. > > What for? Just keep it through your instance_mkdir/instance_rmdir and be > done with that. Sure, it means that you need variants of file/directory > creation/removal primitives that would assume that parent is already locked > by caller (and would leave unlocking to the caller as well). So add them...
BTW, could you merge vfs.git#debugfs_automount, rather than copy the commits into your branch? Bloody inconvenient as it is...
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