diff options
Diffstat (limited to 'lib/libprocstat/zfs.c')
| -rw-r--r-- | lib/libprocstat/zfs.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libprocstat/zfs.c b/lib/libprocstat/zfs.c new file mode 100644 index 000000000000..6dc23d7573fd --- /dev/null +++ b/lib/libprocstat/zfs.c @@ -0,0 +1,112 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2007 Ulf Lilleengen + * All rights reserved. + * + * 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/param.h> +#define _WANT_MOUNT +#include <sys/mount.h> +#include <sys/queue.h> +#include <sys/stat.h> +#include <sys/sysctl.h> +#include <sys/time.h> +#include <sys/vnode.h> +#define _WANT_ZNODE +#include <sys/zfs_context.h> +#include <sys/zfs_znode.h> + +#include <netinet/in.h> + +#include <err.h> +#include <kvm.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> + +#define ZFS +#include "libprocstat.h" +#include "common_kvm.h" + +int +zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) +{ + + struct mount mount, *mountptr; + znode_t *kznodeptr, *znode; + size_t len; + int size; + + len = sizeof(size); + if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) { + warnx("error getting sysctl"); + return (1); + } + znode = malloc(size); + if (znode == NULL) { + warnx("error allocating memory for znode storage"); + return (1); + } + + if ((size_t)size != sizeof(znode_t)) + warnx("znode_t size mismatch, data could be wrong"); + + if ((size_t)size < offsetof(znode_t, z_id) + sizeof(znode->z_id) || + (size_t)size < offsetof(znode_t, z_mode) + sizeof(znode->z_mode) || + (size_t)size < offsetof(znode_t, z_size) + sizeof(znode->z_size)) { + warnx("znode_t size is too small"); + goto bad; + } + + /* + * OpenZFS's libspl provides a dummy sys/vnode.h that shadows ours so + * struct vnode is an incomplete type. Use the wrapper until that is + * resolved. + */ + kznodeptr = getvnodedata(vp); + if (!kvm_read_all(kd, (unsigned long)kznodeptr, znode, (size_t)size)) { + warnx("can't read znode at %p", (void *)kznodeptr); + goto bad; + } + + /* Get the mount pointer, and read from the address. */ + mountptr = getvnodemount(vp); + if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) { + warnx("can't read mount at %p", (void *)mountptr); + goto bad; + } + + /* + * XXX Assume that this is a znode, but it can be a special node + * under .zfs/. + */ + vn->vn_fsid = mount.mnt_stat.f_fsid.val[0]; + vn->vn_fileid = znode->z_id; + vn->vn_mode = znode->z_mode; + vn->vn_size = znode->z_size; + return (0); +bad: + return (1); +} |