e651144614
# ls -ld /mnt/{foo,bar}
drwxr-xr-x 3 root wheel 512 Mar 16 06:56 /mnt/bar
lrwxr-xr-x 1 root wheel 3 Mar 16 12:10 /mnt/foo -> bar
# grep /mnt/foo /etc/fstab
/dev/da1 /mnt/foo ufs rw 0 0
Which means, we give symbolic link as a mount point to mount(8), but mount(8)
use realpath(3) before mounting the file systems, so we get:
# mount | grep /dev/da1
/dev/da1 on /mnt/bar (ufs, local)
Before the commit:
# snapinfo /mnt/foo
usage: snapinfo [-v] -a
snapinfo [-v] mountpoint
# snapinfo /mnt/bar
/mnt/bar/snap
This commit makes snapinfo(8) to first realpath(3) the given mount point and
now we have:
# snapinfo /mnt/foo
/mnt/bar/snap
# snapinfo /mnt/bar
/mnt/bar/snap
180 lines
4.0 KiB
C
180 lines
4.0 KiB
C
/*-
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* Copyright (c) 2005 Mark Santcroos <marks@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <errno.h>
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#include <ftw.h>
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#include <libufs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void find_inum(char *path);
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void usage(void);
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int compare_function(const char *, const struct stat *, int, struct FTW *);
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int find_snapshot(struct statfs *sfs);
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int verbose;
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int cont_search;
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uint32_t inode;
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int
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main(int argc, char **argv)
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{
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char *path;
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struct stat st;
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struct statfs *mntbuf;
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int all = 0, ch, done = 0, fscount, n;
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while ((ch = getopt(argc, argv, "adv")) != -1) {
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switch (ch) {
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case 'a':
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all++;
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break;
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case 'd':
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/* continue to search when matching inode is found
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* this feature is not documented */
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cont_search++;
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if ((all == 0 && argc != 1) || (all == 1 && argc > 0))
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usage();
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if (!all) {
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char resolved[PATH_MAX];
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path = *argv;
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/*
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* mount(8) use realpath(3) before mounting file system,
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* so let's do the same with the given path.
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*/
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if (realpath(path, resolved) == NULL || /* can create full path */
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stat(resolved, &st) == -1 || /* is it stat'able */
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!S_ISDIR(st.st_mode)) { /* is it a directory */
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usage();
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}
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path = resolved;
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}
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fscount = getmntinfo(&mntbuf, MNT_WAIT);
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for (n = 0; n < fscount; n++) {
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if (!strncmp(mntbuf[n].f_fstypename, "ufs", 3)) {
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if (all || strcmp(path, mntbuf[n].f_mntonname) == 0) {
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find_snapshot(&mntbuf[n]);
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done++;
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}
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}
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}
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if (done == 0)
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usage();
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return (0);
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}
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int
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find_snapshot(struct statfs *sfs)
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{
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struct uufsd disk;
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int j, snapcount = 0;
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if (ufs_disk_fillout(&disk, sfs->f_mntfromname) == -1)
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perror("ufs_disk_fillout");
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if (verbose)
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printf("%s mounted on %s\n", disk.d_name, disk.d_fs.fs_fsmnt);
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for (j = 0; j < FSMAXSNAP; j++) {
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if (disk.d_fs.fs_snapinum[j]) {
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inode = disk.d_fs.fs_snapinum[j];
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find_inum(sfs->f_mntonname);
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snapcount++;
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}
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}
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if (!snapcount && verbose)
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printf("\tno snapshots found\n");
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return 0;
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}
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int
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compare_function(const char *path, const struct stat *st, int flags,
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struct FTW * ftwv)
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{
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if (flags == FTW_F && st->st_ino == inode) {
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if (verbose)
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printf("\tsnapshot ");
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printf("%s", path);
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if (verbose)
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printf(" (inode %d)", st->st_ino);
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printf("\n");
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if (!cont_search)
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return (EEXIST);
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}
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return (0);
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}
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void
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find_inum(char *path)
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{
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int ret;
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ret = nftw(path, compare_function, 1, FTW_PHYS|FTW_MOUNT);
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if (ret != EEXIST && ret != 0) {
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perror("ftw");
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exit(ret);
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}
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}
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void
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usage(void)
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{
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printf("usage: snapinfo [-v] -a\n");
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printf(" snapinfo [-v] mountpoint\n");
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exit(1);
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}
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