Overview
========

This patch series replaces raw dentry pointers in the debugfs API with
an opaque wrapper struct:

	struct debugfs_node {
		struct dentry dentry;
	};

Intermediate commits rely on "#define debugfs_node dentry" to migrate
debugfs users without breaking the build. The final commit introduces
the struct and updates debugfs internals accordingly.

Why an RFC?
===========

This is a large change, and I expect a few iterations -- unless this
entire approach is NACKed of course :) Any advice is appreciated, and
I'm particularly looking for feedback on the following:

1. This change touches over 1100 files. Is that okay? I've been told it
   is because the patch series does "one thing", but it is a lot of
   files to touch across many systems.

2. The trickiest part of this migration is ensuring a declaration for
   struct debugfs_node is in scope so we don't get errors that it is
   being implicitly defined, especially as different kernel
   configurations change which headers are transitively included. See
   "#includes and #defines" below. I'm open to any other migration
   strategies.

3. This change is mostly automated with Coccinelle, but I'm really
   contorting Coccinelle to replace dentry with debugfs_node in
   different kinds of declarations. Any Coccinelle advice would be
   appreciated.

Purpose/Background
==================

debugfs currently relies on dentry to represent its filesystem
hierarchy, and its API directly exposes dentry pointers to users. This
tight coupling makes it difficult to modify debugfs internals. A dentry
and inode should exist only when needed, rather than being persistently
tied to debugfs. Some kernel developers have proposed using an opaque
handle for debugfs nodes instead of dentry pointers [1][2][3].

Replacing dentry with debugfs_node simplifies future migrations away
from dentry. Additionally, a declaration with debugfs_node is more
self-explanatory -- its purpose is immediately clear, unlike dentry,
which requires further context to understand its role as a debugfs
dentry.

About this patch series
=======================

This series makes the following changes:

1. Add a temporary "#define debugfs_node dentry".
2. Introduce debugfs helper functions used by Coccinelle rules.
3. Update relay to use debugfs_node instead of dentry.
4. Use Coccinelle to convert most of the kernel to debugfs_node.
5. Apply manual fixes for cases Coccinelle missed.
6. Remove the #define and introduce struct debugfs_node.

The #define is placed in both debugfs.h and dcache.h to avoid
unnecessary #include <linux/debugfs.h> additions or forward declarations
that would be removed in the final commit.

Most changes outside of fs/debugfs/ were mechanical and handled by
Coccinelle. Manual fixes were needed in cases where Coccinelle couldn't
fully convert the code, like dentry declarations nested in layers of
headers or function calls, code inside macros, etc.

The changes to fs/debugfs/ are straightforward, swapping dentry with
debugfs_node in the API where appropriate. Internal functions convert
between the two as needed. I introduced a few trivial helper functions
for specific debugfs users. Thanks to Al Viro's recent refactoring,
parts of this change were simpler to implement.

Relay changes
=============

The most non-obvious change is in the relay system. While the relay
documentation suggests support for non-debugfs users, in practice all
relay users rely on debugfs. I updated relay to use debugfs_node and
revised the documentation.

Coccinelle
==========

I wrote a Coccinelle script to automate most of the conversion. The
script is inlined at the bottom of the commit message where it was run.
This is my first time using Coccinelle, so any feedback is welcome!

The script does the following:

- Find all dentry identifiers that are arguments to or return values of
  a debugfs_* function. This step detects both debugfs.h functions and
  various wrapper functions defined outside of debugfs proper.

- Update relevant declarations and function signatures to use
  debugfs_node instead of dentry.

- Perform further fixups where appropriate. For example, replace
  d_inode() or ->d_inode with debugfs_node_inode().

Challenges I encountered:

- Running a single spatch invocation over the whole tree produces
  inconsistent results because of how header diffs are resolved. spatch
  can take different paths to resolve a header file, sometimes resulting
  in different -- sometimes conflicting -- patch hunks. I avoided this
  problem by writing a bash script that runs spatch against any files
  containing "dentry" or "debugfs", one-by-one.

- The script is more verbose than I would like. I started small but had
  to break out cases and duplicate rules for clarity and reliability.

I focused on handling the most common cases rather than covering every
edge case, balancing script complexity with effectiveness. The script
performs pretty well -- most of this patch set was generated from it.
All clever attempts I made to add new rules resulted in needing more
manual fixups.

#includes and #defines
======================

struct dentry is implicitly defined, transitively included (usually
through <linux/fs.h>), or defined with a forward declaration in much of
the files affected by this patch series. Usually <linux/debugfs.h> is
_not_ included in those same files. For the intermediate commits, we
need to ensure the #define is in scope wherever debugfs_node is used so
it isn't considered a forward declaration of a distinct type.
Automatically ensuring the #define and/or a debugfs.h include is in
scope is difficult.

I found one heuristic that was easy to automate and mostly does the job:
in files we modify, wherever there is a forward declaration of "struct
dentry;", temporarily add a "#define debugfs_node" right below it. The
Coccinelle script implements this heuristic. The final commit removes
these #defines and replaces the dentry declaration with debugfs_node.

Suggestions for solving this problem without peppering #defines in an
intermediate commit is welcome. I'm still not totally confident that
_some_ kernel configuration won't break because an #include is missing.

I originally had this entire patch series reversed, where we immediately
define struct debugfs_node without an intermediate #define, but the
whole migration has to be done in a single commit for that to work. This
approach suffers from similar issues about debugfs_node being in scope
to avoid implicit declaration errors.

Testing
=======

My primary form of testing was compiling without errors. This was tested
by building every commit in this series on an x86_64 machine with
allmodconfig, as well as cross-compiling to s390, arm, and powerpc64. I
also loaded a more minimal kernel into QEMU and ran:

  find /sys/kernel/debug -type f -exec stat {} +

To catch any missed instances of dentry declarations related to debugfs,
I ran the following ripgrep command and reviewed its output to ensure I
didn't miss anything obvious:

  rg 'struct dentry \*.*(debug|dbg)|(debug|dbg).*struct dentry \*' \
    -g '*.{c,h}' -g '!fs/debugfs' -g '!include/linux/debugfs.h'

Links
=====

Link: https://lore.kernel.org/all/2024012600-dose-happiest-f57d@gregkh/ [1]
Link: https://lore.kernel.org/all/20240125104822.04a5ad44@gandalf.local.home/ [2]
Link: https://lore.kernel.org/all/20250128102744.1b94a789@gandalf.local.home/ [3]

David Reaver (6):
  debugfs: Add temporary "#define debugfs_node dentry" directives
  debugfs: Add helper functions for debugfs_node encapsulation
  relay: Replace dentry with debugfs_node
  debugfs: Automated conversion from dentry to debugfs_node
  debugfs: Manual fixes for incomplete Coccinelle conversions
  debugfs: Replace debugfs_node #define with struct wrapping dentry

 Documentation/filesystems/relay.rst           |  32 ++-
 arch/arm/mach-omap1/pm.c                      |   2 +-
 arch/arm/mach-omap2/pm-debug.c                |   6 +-
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 arch/powerpc/include/asm/kvm_ppc.h            |   2 +-
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 arch/powerpc/kvm/book3s_hv.c                  |   6 +-
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 arch/powerpc/kvm/book3s_xive.h                |   2 +-
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 arch/powerpc/kvm/timing.c                     |   2 +-
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 arch/powerpc/platforms/powernv/opal-imc.c     |   4 +-
 arch/powerpc/platforms/powernv/opal-lpc.c     |   4 +-
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 arch/powerpc/platforms/powernv/pci.h          |   2 +-
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 arch/powerpc/platforms/pseries/dtl.c          |   2 +-
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 drivers/block/brd.c                           |   2 +-
 drivers/block/drbd/drbd_debugfs.c             |  26 +-
 drivers/block/drbd/drbd_int.h                 |  30 +--
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 .../intel/qat/qat_common/adf_accel_devices.h  |   8 +-
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 drivers/crypto/nx/nx.h                        |   2 +-
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 include/linux/irqdesc.h                       |   5 +-
 include/linux/kvm_host.h                      |   5 +-
 include/linux/mfd/aat2870.h                   |   2 +-
 include/linux/mhi.h                           |   2 +-
 include/linux/mlx5/driver.h                   |  24 +-
 include/linux/mmc/card.h                      |   2 +-
 include/linux/mmc/host.h                      |   2 +-
 include/linux/moxtet.h                        |   2 +-
 include/linux/mtd/mtd.h                       |   2 +-
 include/linux/mtd/spi-nor.h                   |   2 +-
 include/linux/phy/phy.h                       |   2 +-
 include/linux/pktcdvd.h                       |   4 +-
 include/linux/power/smartreflex.h             |   2 +-
 include/linux/regulator/driver.h              |   2 +-
 include/linux/relay.h                         |  19 +-
 include/linux/remoteproc.h                    |   2 +-
 include/linux/shrinker.h                      |   2 +-
 include/linux/soundwire/sdw.h                 |   5 +-
 include/linux/sunrpc/clnt.h                   |   2 +-
 include/linux/sunrpc/xprt.h                   |   2 +-
 include/linux/swiotlb.h                       |   2 +-
 include/linux/thunderbolt.h                   |   2 +-
 include/linux/usb.h                           |   2 +-
 include/linux/vfio.h                          |   2 +-
 include/linux/virtio.h                        |   2 +-
 include/linux/wkup_m3_ipc.h                   |   2 +-
 include/linux/wwan.h                          |   8 +-
 include/linux/xattr.h                         |   1 +
 include/media/cec.h                           |   2 +-
 include/media/v4l2-async.h                    |   5 +-
 include/media/v4l2-dev.h                      |   5 +-
 include/media/v4l2-dv-timings.h               |   8 +-
 include/net/6lowpan.h                         |   2 +-
 include/net/bluetooth/bluetooth.h             |   2 +-
 include/net/bluetooth/hci_core.h              |   4 +-
 include/net/bonding.h                         |   2 +-
 include/net/cfg80211.h                        |   2 +-
 include/net/mac80211.h                        |  14 +-
 include/net/mana/gdma.h                       |   4 +-
 include/net/mana/mana.h                       |  10 +-
 include/soc/tegra/bpmp.h                      |   2 +-
 include/soc/tegra/mc.h                        |   2 +-
 include/sound/core.h                          |   4 +-
 include/sound/soc-component.h                 |   2 +-
 include/sound/soc-dapm.h                      |   5 +-
 include/sound/soc-dpcm.h                      |   2 +-
 include/sound/soc.h                           |   6 +-
 include/ufs/ufshcd.h                          |   2 +-
 kernel/dma/debug.c                            |   2 +-
 kernel/dma/map_benchmark.c                    |   4 +-
 kernel/dma/pool.c                             |   2 +-
 kernel/fail_function.c                        |   6 +-
 kernel/futex/core.c                           |   2 +-
 kernel/gcov/fs.c                              |   6 +-
 kernel/irq/debugfs.c                          |   4 +-
 kernel/irq/internals.h                        |   4 +-
 kernel/irq/irqdomain.c                        |   4 +-
 kernel/kprobes.c                              |   2 +-
 kernel/locking/lock_events.c                  |   2 +-
 kernel/module/internal.h                      |   2 +-
 kernel/module/main.c                          |   2 +-
 kernel/module/tracking.c                      |   2 +-
 kernel/power/energy_model.c                   |   8 +-
 kernel/printk/index.c                         |   4 +-
 kernel/relay.c                                |  88 +++----
 kernel/sched/debug.c                          |  16 +-
 kernel/trace/blktrace.c                       |   8 +-
 kernel/trace/trace.h                          |   2 +-
 lib/842/842_debugfs.h                         |   2 +-
 lib/debugobjects.c                            |   2 +-
 lib/dynamic_debug.c                           |   2 +-
 lib/error-inject.c                            |   2 +-
 lib/fault-inject-usercopy.c                   |   2 +-
 lib/fault-inject.c                            |  13 +-
 lib/kunit/debugfs.c                           |   2 +-
 lib/memory-notifier-error-inject.c            |   2 +-
 lib/netdev-notifier-error-inject.c            |   2 +-
 lib/notifier-error-inject.c                   |  18 +-
 lib/notifier-error-inject.h                   |   9 +-
 lib/of-reconfig-notifier-error-inject.c       |   2 +-
 lib/pm-notifier-error-inject.c                |   2 +-
 lib/stackdepot.c                              |   2 +-
 lib/test_fpu_glue.c                           |   2 +-
 mm/backing-dev.c                              |   2 +-
 mm/cma_debug.c                                |   7 +-
 mm/fail_page_alloc.c                          |   2 +-
 mm/failslab.c                                 |   2 +-
 mm/hwpoison-inject.c                          |   2 +-
 mm/internal.h                                 |   8 +-
 mm/kfence/core.c                              |   2 +-
 mm/memblock.c                                 |   2 +-
 mm/page_owner.c                               |   2 +-
 mm/shrinker.c                                 |   2 +-
 mm/shrinker_debug.c                           |  13 +-
 mm/slub.c                                     |   4 +-
 mm/vmstat.c                                   |   2 +-
 mm/zsmalloc.c                                 |   4 +-
 mm/zswap.c                                    |   2 +-
 net/6lowpan/debugfs.c                         |  10 +-
 net/bluetooth/6lowpan.c                       |   4 +-
 net/bluetooth/af_bluetooth.c                  |   2 +-
 net/bluetooth/iso.c                           |   2 +-
 net/bluetooth/l2cap_core.c                    |   2 +-
 net/bluetooth/rfcomm/core.c                   |   2 +-
 net/bluetooth/rfcomm/sock.c                   |   2 +-
 net/bluetooth/sco.c                           |   2 +-
 net/caif/caif_socket.c                        |   2 +-
 net/ceph/debugfs.c                            |   2 +-
 net/core/skb_fault_injection.c                |   2 +-
 net/hsr/hsr_debugfs.c                         |   4 +-
 net/hsr/hsr_main.h                            |   2 +-
 net/l2tp/l2tp_debugfs.c                       |   2 +-
 net/mac80211/debugfs.c                        |   4 +-
 net/mac80211/debugfs_netdev.c                 |  14 +-
 net/mac80211/debugfs_sta.c                    |   2 +-
 net/mac80211/driver-ops.h                     |   6 +-
 net/mac80211/ieee80211_i.h                    |  16 +-
 net/mac80211/key.h                            |   4 +-
 net/mac80211/rate.h                           |   2 +-
 net/mac80211/rc80211_minstrel_ht.c            |   2 +-
 net/mac80211/rc80211_minstrel_ht.h            |   3 +-
 net/mac80211/rc80211_minstrel_ht_debugfs.c    |   3 +-
 net/mac80211/sta_info.h                       |   4 +-
 net/sunrpc/debugfs.c                          |  13 +-
 net/wireless/core.c                           |   2 +-
 net/wireless/debugfs.c                        |   6 +-
 samples/qmi/qmi_sample_client.c               |   8 +-
 sound/core/jack.c                             |   2 +-
 sound/core/sound.c                            |   2 +-
 sound/drivers/pcmtest.c                       |   2 +-
 sound/pci/hda/cs35l56_hda.h                   |   3 +-
 sound/soc/codecs/cs35l56.c                    |   2 +-
 sound/soc/fsl/fsl_ssi.h                       |   2 +-
 sound/soc/fsl/imx-audmux.c                    |   2 +-
 sound/soc/intel/avs/avs.h                     |   2 +-
 sound/soc/mediatek/mt8195/mt8195-afe-common.h |   2 +-
 sound/soc/mediatek/mt8365/mt8365-afe-common.h |   2 +-
 sound/soc/renesas/rcar/debugfs.c              |   2 +-
 sound/soc/soc-core.c                          |   2 +-
 sound/soc/soc-dapm.c                          |   4 +-
 sound/soc/sof/debug.c                         |   2 +-
 sound/soc/sof/ipc4-mtrace.c                   |   2 +-
 sound/soc/sof/sof-client-ipc-flood-test.c     |   6 +-
 .../soc/sof/sof-client-ipc-kernel-injector.c  |   4 +-
 sound/soc/sof/sof-client-ipc-msg-injector.c   |   4 +-
 sound/soc/sof/sof-client-probes.c             |   2 +-
 sound/soc/sof/sof-client-probes.h             |   4 +-
 sound/soc/sof/sof-client.c                    |   2 +-
 sound/soc/sof/sof-client.h                    |   3 +-
 sound/soc/sof/sof-priv.h                      |   2 +-
 virt/kvm/kvm_main.c                           |  11 +-
 1117 files changed, 2971 insertions(+), 2636 deletions(-)


base-commit: a64dcfb451e254085a7daee5fe51bf22959d52d3

On Sun, Feb 09, 2025 at 09:20:20PM -0800, David Reaver wrote:
> Overview
> ========
> 
> This patch series replaces raw dentry pointers in the debugfs API with
> an opaque wrapper struct:
> 
> 	struct debugfs_node {
> 		struct dentry dentry;
> 	};
> 
> Intermediate commits rely on "#define debugfs_node dentry" to migrate
> debugfs users without breaking the build. The final commit introduces
> the struct and updates debugfs internals accordingly.
> 
> Why an RFC?
> ===========
> 
> This is a large change, and I expect a few iterations -- unless this
> entire approach is NACKed of course :) Any advice is appreciated, and
> I'm particularly looking for feedback on the following:

Do not embed struct dentry into anything else.

Do not take over its lifetime rules.

For the record:

	Anything of that sort is going to be vetoed.

On Sun, Feb 09, 2025 at 09:20:20PM -0800, David Reaver wrote:
> Overview
> ========
> 
> This patch series replaces raw dentry pointers in the debugfs API with
> an opaque wrapper struct:
> 
> 	struct debugfs_node {
> 		struct dentry dentry;
> 	};
> 
> Intermediate commits rely on "#define debugfs_node dentry" to migrate
> debugfs users without breaking the build. The final commit introduces
> the struct and updates debugfs internals accordingly.
> 
> Why an RFC?
> ===========
> 
> This is a large change, and I expect a few iterations -- unless this
> entire approach is NACKed of course :) Any advice is appreciated, and
> I'm particularly looking for feedback on the following:
> 
> 1. This change touches over 1100 files. Is that okay? I've been told it
>    is because the patch series does "one thing", but it is a lot of
>    files to touch across many systems.
> 
> 2. The trickiest part of this migration is ensuring a declaration for
>    struct debugfs_node is in scope so we don't get errors that it is
>    being implicitly defined, especially as different kernel
>    configurations change which headers are transitively included. See
>    "#includes and #defines" below. I'm open to any other migration
>    strategies.
> 
> 3. This change is mostly automated with Coccinelle, but I'm really
>    contorting Coccinelle to replace dentry with debugfs_node in
>    different kinds of declarations. Any Coccinelle advice would be
>    appreciated.
> 
> Purpose/Background
> ==================
> 
> debugfs currently relies on dentry to represent its filesystem
> hierarchy, and its API directly exposes dentry pointers to users. This
> tight coupling makes it difficult to modify debugfs internals. A dentry
> and inode should exist only when needed, rather than being persistently
> tied to debugfs. Some kernel developers have proposed using an opaque
> handle for debugfs nodes instead of dentry pointers [1][2][3].
> 
> Replacing dentry with debugfs_node simplifies future migrations away
> from dentry. Additionally, a declaration with debugfs_node is more
> self-explanatory -- its purpose is immediately clear, unlike dentry,
> which requires further context to understand its role as a debugfs
> dentry.

First off, many thanks for attempting this, I didn't think it was ready
to even be attempted, so it's very nice to see this.

That being said, I agree with Al, we can't embed a dentry in a structure
like that as the lifecycles are going to get messy fast.

Also, your replacement of many of the dentry functions with wrappers
seems at bit odd, ideally you would just return a dentry from a call
like "debugfs_node_to_dentry()" and then let the caller do with it what
it wants to, that way you don't need to wrap everything.

And finally, I think that many of the places where you did have to
convert the code to save off a debugfs node instead of a dentry can be
removed entirely as a "lookup this file" can be used instead.  I was
waiting for more conversions of that logic, removing the need to store
anything in a driver/subsystem first, before attempting to get rid of
the returned dentry pointer.

As an example of this, why not look at removing almost all of those
pointers in the relay code?  Why is all of that being stored at all?

Oh, also, all of those forward declarations look really odd, something
feels wrong with needing that type of patch if we are doing things
right.  Are you sure it was needed?

thanks,

greg k-h

Greg Kroah-Hartman <gregkh@linuxfoundation.org> writes:

>
> First off, many thanks for attempting this, I didn't think it was ready
> to even be attempted, so it's very nice to see this.
>

No problem, and thank you for taking a look!

> That being said, I agree with Al, we can't embed a dentry in a structure
> like that as the lifecycles are going to get messy fast.
>

Ack, I'll do something different in v2.

For my own education: what goes wrong with lifecycles with this embed?
Feel free to point me at a doc or something.

Also, Al and Greg, would wrapping a pointer be fine?

	struct debugfs_node {
		struct dentry *dentry;
	};

I was trying to do the simplest thing possible so the bulk of the change
was mechanical. Wrapping a pointer is slightly more complicated because
we have to deal with memory allocation, but it is still totally doable.

> Also, your replacement of many of the dentry functions with wrappers
> seems at bit odd, ideally you would just return a dentry from a call
> like "debugfs_node_to_dentry()" and then let the caller do with it what
> it wants to, that way you don't need to wrap everything.
>

Understood. I considered exposing the underlying dentry as a "dirty
backdoor" around the opaque wrapper, so I was trying to minimize it :)
I'm happy to undo some of these wrappers though, it will make the change
simpler.

> And finally, I think that many of the places where you did have to
> convert the code to save off a debugfs node instead of a dentry can be
> removed entirely as a "lookup this file" can be used instead.  I was
> waiting for more conversions of that logic, removing the need to store
> anything in a driver/subsystem first, before attempting to get rid of
> the returned dentry pointer.
>

Yeah this is a great idea, and could even be done in a few patches
outside of this large migration patch series if necessary. I'll
investigate.

> As an example of this, why not look at removing almost all of those
> pointers in the relay code?  Why is all of that being stored at all?
>

I'll take another look at the relay code as well and see if I can remove
the pointers.

> Oh, also, all of those forward declarations look really odd, something
> feels wrong with needing that type of patch if we are doing things
> right.  Are you sure it was needed?
>

I agree with this sentiment, and I discussed this in the cover letter a
bit under the section "#includes and #defines". The need for peppering
temporary #defines (for intermediate commits) and forward declarations
around is my least favorite part of this patch series.

I am indeed sure they are needed in most cases. I'll give a few examples
for both the temporary #defines Coccinelle adds and the forward
declarations that replace the #defines in the last commit:

1. If you remove the forward declaration (or the corresponding temporary
   #define in the Coccincelle commit) in
   drivers/gpu/drm/xe/xe_gsc_debugfs.h, you get this compilation error:

   drivers/gpu/drm/xe/xe_gsc_debugfs.h:12:57: error: ‘struct debugfs_node’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
      12 | void xe_gsc_debugfs_register(struct xe_gsc *gsc, struct debugfs_node *parent);

   gcc does not like implicitly-defined types inside of function
   arguments. As far as I can tell, we only get this error for function
   arguments; this is apparently okay for a top-level declaration, like:

   struct debugfs_node *my_root_node;


2. In the Coccinelle commit, if you remove the #define debugfs_node from
   include/linux/fault-inject.h, you get errors of this sort:

   mm/fail_page_alloc.c:55:13: error: assignment to ‘struct dentry *’ from incompatible pointer type ‘struct debugfs_node *’ [-Werror=incompatible-pointer-types]
      55 |         dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
         |             ^

   Because the #define is not in scope, the compiler is assuming we are
   implicitly defining a new type.


The Coccinelle script adds a forward declaration of struct debugfs_node
wherever there was one for struct dentry. This is just a heuristic I
found that seemed to do the job and was easy to automate.

I originally did this whole patch series in reverse, where we
immediately make struct debugfs_node, migrate debugfs internals, and
migrate all users of the API, but that leads to one very large commit
and appeared harder to review to me. I went with this intermediate
#define idea so the commits could be split up and each commit would
compile, but I don't like the little bit of extra complexity it adds.

I'm open to any other migration ideas folks have! I'm not tied to these
two plans at all.

Thanks,
David Reaver

On Mon, 10 Feb 2025 08:08:25 -0800
David Reaver <me@davidreaver.com> wrote:

> Greg Kroah-Hartman <gregkh@linuxfoundation.org> writes:
> 
> >
> > First off, many thanks for attempting this, I didn't think it was ready
> > to even be attempted, so it's very nice to see this.
> >  
> 
> No problem, and thank you for taking a look!
> 
> > That being said, I agree with Al, we can't embed a dentry in a structure
> > like that as the lifecycles are going to get messy fast.
> >  
> 
> Ack, I'll do something different in v2.
> 
> For my own education: what goes wrong with lifecycles with this embed?
> Feel free to point me at a doc or something.
> 
> Also, Al and Greg, would wrapping a pointer be fine?
> 
> 	struct debugfs_node {
> 		struct dentry *dentry;
> 	};

No it will not be fine. You should not be using dentry at all. I thought
this was going to convert debugfs over to kernfs. The debugfs_node should
be using kernfs and completely eliminate the use of dentry.


> 
> I was trying to do the simplest thing possible so the bulk of the change
> was mechanical. Wrapping a pointer is slightly more complicated because
> we have to deal with memory allocation, but it is still totally doable.
> 
> > Also, your replacement of many of the dentry functions with wrappers
> > seems at bit odd, ideally you would just return a dentry from a call
> > like "debugfs_node_to_dentry()" and then let the caller do with it what
> > it wants to, that way you don't need to wrap everything.

What caller should ever touch a dentry? What I got from my "conversation"
with Linus, is that dentry is an internal caching descriptor of the VFS
layer, and should only be used by the VFS layer. Nothing outside of VFS
should ever need a dentry.

-- Steve

Steven Rostedt <rostedt@goodmis.org> writes:

>
> No it will not be fine. You should not be using dentry at all. I thought
> this was going to convert debugfs over to kernfs. The debugfs_node should
> be using kernfs and completely eliminate the use of dentry.
>
> <snip>
>
> What caller should ever touch a dentry? What I got from my "conversation"
> with Linus, is that dentry is an internal caching descriptor of the VFS
> layer, and should only be used by the VFS layer. Nothing outside of VFS
> should ever need a dentry.
>
> -- Steve

I agree that just wrapping a dentry shouldn't be the final state for
debugfs_node, but this patch series is _only_ trying to introduce
debugfs_node as an opaque wrapper/handle.

It isn't clear to me that there is consensus on even using kernfs for
debugfs. Even if there was consensus, a full conversion to kernfs would
take 10x as much code and be extremely difficult to automate. For
example, using kernfs would require migrating all of the debugfs users'
file_operations to use the kernfs equivalent.

I figure any change away from persistent dentry handles for debugfs
requires introducing something akin to debugfs_node, so we could get
that out of the way first.

Thanks,
David Reaver

On Mon, Feb 10, 2025 at 11:53:13AM -0500, Steven Rostedt wrote:

> No it will not be fine. You should not be using dentry at all. I thought
> this was going to convert debugfs over to kernfs. The debugfs_node should
> be using kernfs and completely eliminate the use of dentry.

I disagree, actually - kernfs is an awful model for anything, sysfs included...

On Mon, 10 Feb 2025 17:00:16 +0000
Al Viro <viro@zeniv.linux.org.uk> wrote:

> On Mon, Feb 10, 2025 at 11:53:13AM -0500, Steven Rostedt wrote:
> 
> > No it will not be fine. You should not be using dentry at all. I thought
> > this was going to convert debugfs over to kernfs. The debugfs_node should
> > be using kernfs and completely eliminate the use of dentry.  
> 
> I disagree, actually - kernfs is an awful model for anything, sysfs included...

Then what would you suggest? It's the only generic system that is
appropriate for control features, where the underlining "files" are
actually functions to modify or query information from the kernel.

The entire VFS layer is designed for efficient management of some kind of
storage device, where the only interaction with the storage device is
through VFS.

For pseudo file systems like debugfs, sysfs and tracefs, the underlining
"storage" is the kernel itself, where we need a way for the "storage" part
to work with the kernel. The VFS layer doesn't give that, which is why
debugfs and tracefs used dentry as that interface, as the dentry does
represent the underlining storage.

From what I understand (and Christian can correct me), is that kernfs was
created to be that interface of the "storage" connecting back to the
kernel. Where the VFS layer deals with the user accessing the file system
(read, write, mkdir, etc) but kernfs is the "data storage" that attaches
those call back to the kernel to retrieve kernel information or even modify
the kernel behavior.

-- Steve

On Mon, 10 Feb 2025 12:12:46 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> From what I understand (and Christian can correct me), is that kernfs was
> created to be that interface of the "storage" connecting back to the
> kernel. Where the VFS layer deals with the user accessing the file system
> (read, write, mkdir, etc) but kernfs is the "data storage" that attaches
> those call back to the kernel to retrieve kernel information or even modify
> the kernel behavior.

To further expand on this, what a pseudo file system would need, is a way
to describe the layout of the file system, and to have the file_operations
defined for each file.

And possibly, a way to control what directories are made and what is in the
directory when a "mkdir" is performed (as mkdir in pseudo file systems
seldom create an empty directory). It would also need to handle the "rmdir"
on those directories.

Would also need to be able to store permissions too.

Debugfs did this with the dentry as the descriptor. But that dentry also
requires a static inode behind it and the memory used for all this was
really being wasted. Having a separate descriptor that acts like a storage
device and saves the file ops is basically all that is needed. It can act
like a real file system where no dentry or inode is created until the file
system is accessed by the user. And then, this descriptor can be attached
to the dentry and have an inode created for it. But after the file is no
longer referenced, the dentry and inode can be freed.

This is what is lacking with debugfs and tracefs at the moment. I did carve
out an "eventfs" from tracefs to do the above, and it saved over 20Megs in
memory when it wasn't being accessed.

-- Steve