Date: Wed, 13 Apr 2011 18:02:18 -0700 From: Jonathan Stuart <jstuart@adaranet.com> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Fleming <mdf356@gmail.com>, Matthew Subject: RE: Getting vnode + credentials of a file from a struct mount and UFS inode # Message-ID: <32AB5C9615CC494997D9ABB1DB12783C024E92A00D@SJ-EXCH-1.adaranet.com> In-Reply-To: <11353544.443834.1302742821487.JavaMail.root@erie.cs.uoguelph.ca> References: <32AB5C9615CC494997D9ABB1DB12783C024E929FE5@SJ-EXCH-1.adaranet.com> <11353544.443834.1302742821487.JavaMail.root@erie.cs.uoguelph.ca>
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Thanks Rick, will try! -----Original Message----- From: Rick Macklem [mailto:rmacklem@uoguelph.ca] Sent: Wednesday, April 13, 2011 6:00 PM To: Jonathan Stuart Cc: freebsd-hackers@freebsd.org; Matthew Fleming Subject: Re: Getting vnode + credentials of a file from a struct mount and UFS inode # > Hi, > > Yes, I am.. that was my suspicion (e.g., that it was the parameters of > the process which called open()/creat()/socket()/... originally). > What's the quickest way to get back to the v/inode's uid/gid? > > Also, calling VFS_VGET() seems to give me a lockmgr panic with unknown > type 0x0. VFS_VGET() returns a vnode ptr, it doesn't need the argument set to one. The flags argument (assuming a recent kernel) needs to be LK_EXCLUSIVE or LK_SHARED, not 0 (I suspect that's your panic). > What is odd is that the only way I can get a vnode for VFS_VGET is > through struct file, and then shouldn't I be able to use that? I tried > using the flipping that vnode->inode with VTOI() and it was also > giving me zeros for i_uid, i_gid, etc., when it shouldn't have been. > After VFS_VGET returns a vp, I'd do a VOP_GETATTR() and then vput() the vp to release it. Look for examples of these calls in the kernel sources. The "struct vattr" filled in by VOP_GETATTR() has va_uid and va_gid in it, which are the uid,gid that owns the file, which is what I think you are trying to get. (Credentials generally refer to the effective uid + gids etc of the process/thread trying to do the syscall.) rick
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