Re: Getting debugfs mountpoint?
>From userspace? Something like:
grep " debugfs " /proc/mounts | awk '{print $2}' | xargs echo -e
>From kernel space? There isn't guaranteed to be _one_, you can mount
multiple instances of most filesystems, and with container support you can
even have multiple debugfs superblocks.
Rob
On Fri, Sep 14, 2012 at 8:49 PM, Jacob Sowles wrote:
> Is there an easy way to get the path to where debugfs is mounted? I
> found a function called debugfs_find_mountpoint(), which is exactly
> what I want, but it’s not exported, so I can’t use it. The only
> exported debugfs functions that I could find are the ones that create,
> remove, etc.
>
> Jacob
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Re: Getting debugfs mountpoint?
On Fri, Sep 14, 2012 at 07:17:12PM -0700, Jacob Sowles wrote: > The first instance of my code calls debugfs_create_file and stores a > pointer to the dentry of that directory. But when the second instance > calls debugfs_create_file, the function returns NULL because that > directory already exists, so it doesn't return the dentry that I need. ... and? Ever heard of that thing called "global variable"? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Getting debugfs mountpoint?
debugfs_create_dir, rather. Not debugfs_create_file. On Fri, Sep 14, 2012 at 7:17 PM, Jacob Sowles wrote: > The first instance of my code calls debugfs_create_file and stores a > pointer to the dentry of that directory. But when the second instance > calls debugfs_create_file, the function returns NULL because that > directory already exists, so it doesn't return the dentry that I need. > > On Fri, Sep 14, 2012 at 7:11 PM, Al Viro wrote: >> On Fri, Sep 14, 2012 at 07:07:43PM -0700, Jacob Sowles wrote: >>> Multiple instances of my code can be run simultaneously, and all >>> instances use the same debugfs directory, so I need the path to the >>> debugfs root directory so that I can use filp_open to get the dentry >>> for that directory. >> >> What's wrong with just storing a pointer to that dentry in a variable? >> And what do you want an opened file (of a directory, at that) on debugfs? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Getting debugfs mountpoint?
The first instance of my code calls debugfs_create_file and stores a pointer to the dentry of that directory. But when the second instance calls debugfs_create_file, the function returns NULL because that directory already exists, so it doesn't return the dentry that I need. On Fri, Sep 14, 2012 at 7:11 PM, Al Viro wrote: > On Fri, Sep 14, 2012 at 07:07:43PM -0700, Jacob Sowles wrote: >> Multiple instances of my code can be run simultaneously, and all >> instances use the same debugfs directory, so I need the path to the >> debugfs root directory so that I can use filp_open to get the dentry >> for that directory. > > What's wrong with just storing a pointer to that dentry in a variable? > And what do you want an opened file (of a directory, at that) on debugfs? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Getting debugfs mountpoint?
On Fri, Sep 14, 2012 at 07:07:43PM -0700, Jacob Sowles wrote: > Multiple instances of my code can be run simultaneously, and all > instances use the same debugfs directory, so I need the path to the > debugfs root directory so that I can use filp_open to get the dentry > for that directory. What's wrong with just storing a pointer to that dentry in a variable? And what do you want an opened file (of a directory, at that) on debugfs? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Getting debugfs mountpoint?
Multiple instances of my code can be run simultaneously, and all instances use the same debugfs directory, so I need the path to the debugfs root directory so that I can use filp_open to get the dentry for that directory. Jacob On Fri, Sep 14, 2012 at 6:57 PM, Al Viro wrote: > On Fri, Sep 14, 2012 at 06:49:01PM -0700, Jacob Sowles wrote: >> Is there an easy way to get the path to where debugfs is mounted? I >> found a function called debugfs_find_mountpoint(), which is exactly >> what I want, but it’s not exported, so I can’t use it. The only >> exported debugfs functions that I could find are the ones that create, >> remove, etc. > > More to the point, it's a userland function. Why would you want that > kernel-side? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Getting debugfs mountpoint?
On Fri, Sep 14, 2012 at 06:49:01PM -0700, Jacob Sowles wrote: > Is there an easy way to get the path to where debugfs is mounted? I > found a function called debugfs_find_mountpoint(), which is exactly > what I want, but it’s not exported, so I can’t use it. The only > exported debugfs functions that I could find are the ones that create, > remove, etc. More to the point, it's a userland function. Why would you want that kernel-side? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Getting debugfs mountpoint?
Is there an easy way to get the path to where debugfs is mounted? I found a function called debugfs_find_mountpoint(), which is exactly what I want, but it’s not exported, so I can’t use it. The only exported debugfs functions that I could find are the ones that create, remove, etc. Jacob -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
