Differential D19258 Diff 54269 head/sys/compat/lindebugfs/lindebugfs.c

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head/sys/compat/lindebugfs/lindebugfs.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/systm.h>
				#include <sys/queue.h>
				#include <sys/blist.h>
				#include <sys/conf.h>
				#include <sys/exec.h>
				#include <sys/filedesc.h>
				#include <sys/kernel.h>
				#include <sys/linker.h>
				#include <sys/malloc.h>
				#include <sys/mount.h>
				#include <sys/mutex.h>
				#include <sys/proc.h>
				#include <sys/resourcevar.h>
				#include <sys/sbuf.h>
				#include <sys/smp.h>
				#include <sys/socket.h>
				#include <sys/vnode.h>
				#include <sys/bus.h>
				#include <sys/pciio.h>

				#include <dev/pci/pcivar.h>
				#include <dev/pci/pcireg.h>

				#include <net/if.h>

				#include <vm/vm.h>
				#include <vm/pmap.h>
				#include <vm/vm_map.h>
				#include <vm/vm_param.h>
				#include <vm/vm_object.h>
				#include <vm/swap_pager.h>

				#include <machine/bus.h>

				#include <compat/linux/linux_ioctl.h>
				#include <compat/linux/linux_mib.h>
				#include <compat/linux/linux_util.h>
				#include <fs/pseudofs/pseudofs.h>

				#include <linux/debugfs.h>
				#include <linux/seq_file.h>
				#include <linux/compat.h>

				MALLOC_DEFINE(M_DFSINT, "debugfsint", "Linux debugfs internal");

				static struct pfs_node *debugfs_root;

				#define DM_SYMLINK 0x1
				#define DM_DIR 0x2
				#define DM_FILE 0x3

				struct dentry_meta {
				struct dentry dm_dnode;
				const struct file_operations *dm_fops;
				void *dm_data;
				umode_t dm_mode;
				int dm_type;
				};

				static int
				debugfs_attr(PFS_ATTR_ARGS)
				{
				struct dentry_meta *dm;

				dm = pn->pn_data;

				vap->va_mode = dm->dm_mode;
				return (0);
				}

				static int
				debugfs_destroy(PFS_DESTROY_ARGS)
				{
				struct dentry_meta *dm;

				dm = pn->pn_data;
				if (dm->dm_type == DM_SYMLINK)
				free(dm->dm_data, M_DFSINT);

				free(dm, M_DFSINT);
				return (0);
				}

				static int
				debugfs_fill(PFS_FILL_ARGS)
				{
				struct dentry_meta *d;
				struct linux_file lf;
				struct seq_file *sf;
				struct vnode vn;
				void *buf;
				int rc;
				size_t len;
				off_t off;

				d = pn->pn_data;

				if ((rc = linux_set_current_flags(curthread, M_NOWAIT)))
				return (rc);
				vn.v_data = d->dm_data;
				buf = uio->uio_iov[0].iov_base;
				len = min(uio->uio_iov[0].iov_len, uio->uio_resid);
				off = 0;
				lf.private_data = NULL;
				rc = d->dm_fops->open(&vn, &lf);
				if (rc < 0) {
				#ifdef INVARIANTS
				printf("%s:%d open failed with %d\n", __FUNCTION__, __LINE__, rc);
				#endif
				return (-rc);
				}
				sf = lf.private_data;
				sf->buf = sb;
				if (uio->uio_rw == UIO_READ)
				rc = d->dm_fops->read(&lf, NULL, len, &off);
				else
				rc = d->dm_fops->write(&lf, buf, len, &off);
				if (d->dm_fops->release)
				d->dm_fops->release(&vn, &lf);
				else
				single_release(&vn, &lf);

				if (rc < 0) {
				#ifdef INVARIANTS
				printf("%s:%d read/write failed with %d\n", __FUNCTION__, __LINE__, rc);
				#endif
				return (-rc);
				}
				return (0);
				}

				static int
				debugfs_fill_data(PFS_FILL_ARGS)
				{
				struct dentry_meta *dm;

				dm = pn->pn_data;
				sbuf_printf(sb, "%s", (char *)dm->dm_data);
				return (0);
				}

				struct dentry *
				debugfs_create_file(const char *name, umode_t mode,
				struct dentry parent, void data,
				const struct file_operations *fops)
				{
				struct dentry_meta *dm;
				struct dentry *dnode;
				struct pfs_node *pnode;
				int flags;

				dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT \| M_ZERO);
				if (dm == NULL)
				return (NULL);
				dnode = &dm->dm_dnode;
				dm->dm_fops = fops;
				dm->dm_data = data;
				dm->dm_mode = mode;
				dm->dm_type = DM_FILE;
				if (parent != NULL)
				pnode = parent->d_pfs_node;
				else
				pnode = debugfs_root;

				flags = fops->write ? PFS_RDWR : PFS_RD;
				dnode->d_pfs_node = pfs_create_file(pnode, name, debugfs_fill,
				debugfs_attr, NULL, debugfs_destroy, flags \| PFS_NOWAIT);
				if (dnode->d_pfs_node == NULL) {
				free(dm, M_DFSINT);
				return (NULL);
				}
				dnode->d_pfs_node->pn_data = dm;

				return (dnode);
				}

				struct dentry *
				debugfs_create_dir(const char name, struct dentry parent)
				{
				struct dentry_meta *dm;
				struct dentry *dnode;
				struct pfs_node *pnode;

				dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT \| M_ZERO);
				if (dm == NULL)
				return (NULL);
				dnode = &dm->dm_dnode;
				dm->dm_mode = 0700;
				dm->dm_type = DM_DIR;
				if (parent != NULL)
				pnode = parent->d_pfs_node;
				else
				pnode = debugfs_root;

				dnode->d_pfs_node = pfs_create_dir(pnode, name, debugfs_attr, NULL, debugfs_destroy, PFS_RD \| PFS_NOWAIT);
				if (dnode->d_pfs_node == NULL) {
				free(dm, M_DFSINT);
				return (NULL);
				}
				dnode->d_pfs_node->pn_data = dm;
				return (dnode);
				}

				struct dentry *
				debugfs_create_symlink(const char name, struct dentry parent,
				const char *dest)
				{
				struct dentry_meta *dm;
				struct dentry *dnode;
				struct pfs_node *pnode;
				void *data;

				data = strdup_flags(dest, M_DFSINT, M_NOWAIT);
				if (data == NULL)
				return (NULL);
				dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT \| M_ZERO);
				if (dm == NULL)
				goto fail1;
				dnode = &dm->dm_dnode;
				dm->dm_mode = 0700;
				dm->dm_type = DM_SYMLINK;
				dm->dm_data = data;
				if (parent != NULL)
				pnode = parent->d_pfs_node;
				else
				pnode = debugfs_root;

				dnode->d_pfs_node = pfs_create_link(pnode, name, &debugfs_fill_data, NULL, NULL, NULL, PFS_NOWAIT);
				if (dnode->d_pfs_node == NULL)
				goto fail;
				dnode->d_pfs_node->pn_data = dm;
				return (dnode);
				fail:
				free(dm, M_DFSINT);
				fail1:
				free(data, M_DFSINT);
				return (NULL);
				}

				void
				debugfs_remove(struct dentry *dnode)
				{
				if (dnode == NULL)
				return;

				pfs_destroy(dnode->d_pfs_node);
				}

				void
				debugfs_remove_recursive(struct dentry *dnode)
				{
				if (dnode == NULL)
				return;

				pfs_destroy(dnode->d_pfs_node);
				}


				static int
				debugfs_init(PFS_INIT_ARGS)
				{

				debugfs_root = pi->pi_root;
				return (0);
				}

				static int
				debugfs_uninit(PFS_INIT_ARGS)
				{
				return (0);
				}

				#ifdef PR_ALLOW_MOUNT_LINSYSFS
				PSEUDOFS(debugfs, 1, PR_ALLOW_MOUNT_LINSYSFS);
				#else
				PSEUDOFS(debugfs, 1, VFCF_JAIL);
				#endif