lindebugfs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/queue.h>
   35 #include <sys/blist.h>
   36 #include <sys/conf.h>
   37 #include <sys/exec.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/kernel.h>
   40 #include <sys/linker.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mount.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 #include <sys/resourcevar.h>
   46 #include <sys/sbuf.h>
   47 #include <sys/smp.h>
   48 #include <sys/socket.h>
   49 #include <sys/vnode.h>
   50 #include <sys/bus.h>
   51 #include <sys/pciio.h>
   52 
   53 #include <dev/pci/pcivar.h>
   54 #include <dev/pci/pcireg.h>
   55 
   56 #include <net/if.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <vm/vm_map.h>
   61 #include <vm/vm_param.h>
   62 #include <vm/vm_object.h>
   63 #include <vm/swap_pager.h>
   64 
   65 #include <machine/bus.h>
   66 
   67 #include <compat/linux/linux_ioctl.h>
   68 #include <compat/linux/linux_mib.h>
   69 #include <compat/linux/linux_util.h>
   70 #include <fs/pseudofs/pseudofs.h>
   71 
   72 #include <linux/debugfs.h>
   73 #include <linux/seq_file.h>
   74 #include <linux/compat.h>
   75 
   76 MALLOC_DEFINE(M_DFSINT, "debugfsint", "Linux debugfs internal");
   77 
   78 static struct pfs_node *debugfs_root;
   79 
   80 #define DM_SYMLINK 0x1
   81 #define DM_DIR 0x2
   82 #define DM_FILE 0x3
   83 
   84 struct dentry_meta {
   85         struct dentry dm_dnode;
   86         const struct file_operations *dm_fops;
   87         void *dm_data;
   88         umode_t dm_mode;
   89         int dm_type;
   90 };
   91 
   92 static int
   93 debugfs_attr(PFS_ATTR_ARGS)
   94 {
   95         struct dentry_meta *dm;
   96 
   97         dm = pn->pn_data;
   98 
   99         vap->va_mode = dm->dm_mode;
  100         return (0);
  101 }
  102 
  103 static int
  104 debugfs_destroy(PFS_DESTROY_ARGS)
  105 {
  106         struct dentry_meta *dm;
  107 
  108         dm = pn->pn_data;
  109         if (dm->dm_type == DM_SYMLINK)
  110                 free(dm->dm_data, M_DFSINT);
  111 
  112         free(dm, M_DFSINT);
  113         return (0);
  114 }
  115 
  116 static int
  117 debugfs_fill(PFS_FILL_ARGS)
  118 {
  119         struct dentry_meta *d;
  120         struct linux_file lf;
  121         struct seq_file *sf;
  122         struct vnode vn;
  123         void *buf;
  124         int rc;
  125         size_t len;
  126         off_t off;
  127 
  128         d = pn->pn_data;
  129 
  130         if ((rc = linux_set_current_flags(curthread, M_NOWAIT)))
  131                 return (rc);
  132         vn.v_data = d->dm_data;
  133         buf = uio->uio_iov[0].iov_base;
  134         len = min(uio->uio_iov[0].iov_len, uio->uio_resid);
  135         off = 0;
  136         lf.private_data = NULL;
  137         rc = d->dm_fops->open(&vn, &lf);
  138         if (rc < 0) {
  139 #ifdef INVARIANTS
  140                 printf("%s:%d open failed with %d\n", __FUNCTION__, __LINE__, rc);
  141 #endif
  142                 return (-rc);
  143         }
  144         sf = lf.private_data;
  145         sf->buf = sb;
  146         if (uio->uio_rw == UIO_READ)
  147                 rc = d->dm_fops->read(&lf, NULL, len, &off);
  148         else
  149                 rc = d->dm_fops->write(&lf, buf, len, &off);
  150         if (d->dm_fops->release)
  151                 d->dm_fops->release(&vn, &lf);
  152         else
  153                 single_release(&vn, &lf);
  154 
  155         if (rc < 0) {
  156 #ifdef INVARIANTS
  157                 printf("%s:%d read/write failed with %d\n", __FUNCTION__, __LINE__, rc);
  158 #endif
  159                 return (-rc);
  160         }
  161         return (0);
  162 }
  163 
  164 static int
  165 debugfs_fill_data(PFS_FILL_ARGS)
  166 {
  167         struct dentry_meta *dm;
  168 
  169         dm = pn->pn_data;
  170         sbuf_printf(sb, "%s", (char *)dm->dm_data);
  171         return (0);
  172 }
  173 
  174 struct dentry *
  175 debugfs_create_file(const char *name, umode_t mode,
  176                     struct dentry *parent, void *data,
  177                     const struct file_operations *fops)
  178 {
  179         struct dentry_meta *dm;
  180         struct dentry *dnode;
  181         struct pfs_node *pnode;
  182         int flags;
  183 
  184         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  185         if (dm == NULL)
  186                 return (NULL);
  187         dnode = &dm->dm_dnode;
  188         dm->dm_fops = fops;
  189         dm->dm_data = data;
  190         dm->dm_mode = mode;
  191         dm->dm_type = DM_FILE;
  192         if (parent != NULL)
  193                 pnode = parent->d_pfs_node;
  194         else
  195                 pnode = debugfs_root;
  196 
  197         flags = fops->write ? PFS_RDWR : PFS_RD;
  198         dnode->d_pfs_node = pfs_create_file(pnode, name, debugfs_fill,
  199             debugfs_attr, NULL, debugfs_destroy, flags | PFS_NOWAIT);
  200         if (dnode->d_pfs_node == NULL) {
  201                 free(dm, M_DFSINT);
  202                 return (NULL);
  203         }
  204         dnode->d_pfs_node->pn_data = dm;
  205 
  206         return (dnode);
  207 }
  208 
  209 struct dentry *
  210 debugfs_create_dir(const char *name, struct dentry *parent)
  211 {
  212         struct dentry_meta *dm;
  213         struct dentry *dnode;
  214         struct pfs_node *pnode;
  215 
  216         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  217         if (dm == NULL)
  218                 return (NULL);
  219         dnode = &dm->dm_dnode;
  220         dm->dm_mode = 0700;
  221         dm->dm_type = DM_DIR;
  222         if (parent != NULL)
  223                 pnode = parent->d_pfs_node;
  224         else
  225                 pnode = debugfs_root;
  226 
  227         dnode->d_pfs_node = pfs_create_dir(pnode, name, debugfs_attr, NULL, debugfs_destroy, PFS_RD | PFS_NOWAIT);
  228         if (dnode->d_pfs_node == NULL) {
  229                 free(dm, M_DFSINT);
  230                 return (NULL);
  231         }
  232         dnode->d_pfs_node->pn_data = dm;
  233         return (dnode);
  234 }
  235 
  236 struct dentry *
  237 debugfs_create_symlink(const char *name, struct dentry *parent,
  238         const char *dest)
  239 {
  240         struct dentry_meta *dm;
  241         struct dentry *dnode;
  242         struct pfs_node *pnode;
  243         void *data;
  244 
  245         data = strdup_flags(dest, M_DFSINT, M_NOWAIT);
  246         if (data == NULL)
  247                 return (NULL);
  248         dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
  249         if (dm == NULL)
  250                 goto fail1;
  251         dnode = &dm->dm_dnode;
  252         dm->dm_mode = 0700;
  253         dm->dm_type = DM_SYMLINK;
  254         dm->dm_data = data;
  255         if (parent != NULL)
  256                 pnode = parent->d_pfs_node;
  257         else
  258                 pnode = debugfs_root;
  259 
  260         dnode->d_pfs_node = pfs_create_link(pnode, name, &debugfs_fill_data, NULL, NULL, NULL, PFS_NOWAIT);
  261         if (dnode->d_pfs_node == NULL)
  262                 goto fail;
  263         dnode->d_pfs_node->pn_data = dm;
  264         return (dnode);
  265  fail:
  266         free(dm, M_DFSINT);
  267  fail1:
  268         free(data, M_DFSINT);
  269         return (NULL);
  270 }
  271 
  272 void
  273 debugfs_remove(struct dentry *dnode)
  274 {
  275         if (dnode == NULL)
  276                 return;
  277 
  278         pfs_destroy(dnode->d_pfs_node);
  279 }
  280 
  281 void
  282 debugfs_remove_recursive(struct dentry *dnode)
  283 {
  284         if (dnode == NULL)
  285                 return;
  286 
  287         pfs_destroy(dnode->d_pfs_node);
  288 }
  289 
  290 
  291 static int
  292 debugfs_init(PFS_INIT_ARGS)
  293 {
  294 
  295         debugfs_root = pi->pi_root;
  296         return (0);
  297 }
  298 
  299 static int
  300 debugfs_uninit(PFS_INIT_ARGS)
  301 {
  302         return (0);
  303 }
  304 
  305 #ifdef PR_ALLOW_MOUNT_LINSYSFS
  306 PSEUDOFS(debugfs, 1, PR_ALLOW_MOUNT_LINSYSFS);
  307 #else
  308 PSEUDOFS(debugfs, 1, VFCF_JAIL);
  309 #endif

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FreeBSD/Linux Kernel Cross Reference sys/compat/lindebugfs/lindebugfs.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/lindebugfs/lindebugfs.c