3f6cab079c
Reviewed by: hps@ MFC after: 1 week Sponsored by: iX Systems Differential Revision: https://reviews.freebsd.org/D19258
310 lines
6.8 KiB
C
310 lines
6.8 KiB
C
/*-
|
|
* 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
|