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lindebugfs.c
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Editing: lindebugfs.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) { if (d->dm_fops->read) rc = d->dm_fops->read(&lf, NULL, len, &off); else rc = ENODEV; } else { if (d->dm_fops->write) rc = d->dm_fops->write(&lf, buf, len, &off); else rc = ENODEV; } 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; (void)debugfs_create_symlink("kcov", NULL, "/dev/kcov"); 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 MODULE_DEPEND(lindebugfs, linuxkpi, 1, 1, 1);
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