diff options
Diffstat (limited to 'lib/libufs/type.c')
| -rw-r--r-- | lib/libufs/type.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/lib/libufs/type.c b/lib/libufs/type.c new file mode 100644 index 000000000000..557e6cdead63 --- /dev/null +++ b/lib/libufs/type.c @@ -0,0 +1,207 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2002 Juli Mallett. All rights reserved. + * + * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the + * FreeBSD project. Redistribution and use in source and binary forms, with + * or without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistribution of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistribution 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 ``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 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> +#include <sys/mount.h> +#include <sys/disklabel.h> +#include <sys/stat.h> + +#include <ufs/ufs/extattr.h> +#include <ufs/ufs/quota.h> +#include <ufs/ufs/ufsmount.h> +#include <ufs/ufs/dinode.h> +#include <ufs/ffs/fs.h> + +#include <errno.h> +#include <fcntl.h> +#include <fstab.h> +#include <paths.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <libufs.h> + +/* Internally, track the 'name' value, it's ours. */ +#define MINE_NAME 0x01 +/* Track if its fd points to a writable device. */ +#define MINE_WRITE 0x02 + +int +ufs_disk_close(struct uufsd *disk) +{ + ERROR(disk, NULL); + close(disk->d_fd); + disk->d_fd = -1; + if (disk->d_mine & MINE_NAME) { + free((char *)(uintptr_t)disk->d_name); + disk->d_name = NULL; + } + if (disk->d_si != NULL) { + free(disk->d_si->si_csp); + free(disk->d_si); + disk->d_si = NULL; + } + return (0); +} + +int +ufs_disk_fillout(struct uufsd *disk, const char *name) +{ + if (ufs_disk_fillout_blank(disk, name) == -1) { + return (-1); + } + if (sbread(disk) == -1) { + ERROR(disk, "could not read superblock to fill out disk"); + ufs_disk_close(disk); + return (-1); + } + return (0); +} + +int +ufs_disk_fillout_blank(struct uufsd *disk, const char *name) +{ + struct stat st; + struct fstab *fs; + struct statfs sfs; + const char *oname; + char dev[MAXPATHLEN]; + int fd, ret; + + ERROR(disk, NULL); + + oname = name; +again: if ((ret = stat(name, &st)) < 0) { + if (*name != '/') { + snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name); + name = dev; + goto again; + } + /* + * The given object doesn't exist, but don't panic just yet - + * it may be still mount point listed in /etc/fstab, but without + * existing corresponding directory. + */ + name = oname; + } + if (ret >= 0 && S_ISREG(st.st_mode)) { + /* Possibly a disk image, give it a try. */ + ; + } else if (ret >= 0 && S_ISCHR(st.st_mode)) { + /* This is what we need, do nothing. */ + ; + } else if ((fs = getfsfile(name)) != NULL) { + /* + * The given mount point is listed in /etc/fstab. + * It is possible that someone unmounted file system by hand + * and different file system is mounted on this mount point, + * but we still prefer /etc/fstab entry, because on the other + * hand, there could be /etc/fstab entry for this mount + * point, but file system is not mounted yet (eg. noauto) and + * statfs(2) will point us at different file system. + */ + name = fs->fs_spec; + } else if (ret >= 0 && S_ISDIR(st.st_mode)) { + /* + * The mount point is not listed in /etc/fstab, so it may be + * file system mounted by hand. + */ + if (statfs(name, &sfs) < 0) { + ERROR(disk, "could not find special device"); + return (-1); + } + strlcpy(dev, sfs.f_mntfromname, sizeof(dev)); + name = dev; + } else { + ERROR(disk, "could not find special device"); + return (-1); + } + fd = open(name, O_RDONLY); + if (fd == -1) { + ERROR(disk, "could not open special device"); + return (-1); + } + + if (((uintptr_t)disk & ~(LIBUFS_BUFALIGN - 1)) != (uintptr_t)disk) { + ERROR(disk, "uufsd structure must be aligned to " + "LIBUFS_BUFALIGN byte boundry, see ufs_disk_fillout(3)"); + close(fd); + return (-1); + } + + disk->d_bsize = 1; + disk->d_ccg = 0; + disk->d_fd = fd; + disk->d_inomin = 0; + disk->d_inomax = 0; + disk->d_lcg = 0; + disk->d_mine = 0; + disk->d_ufs = 0; + disk->d_error = NULL; + disk->d_si = NULL; + disk->d_sblockloc = UFS_STDSB; + disk->d_lookupflags = 0; + + if (oname != name) { + name = strdup(name); + if (name == NULL) { + ERROR(disk, "could not allocate memory for disk name"); + return (-1); + } + disk->d_mine |= MINE_NAME; + } + disk->d_name = name; + + return (0); +} + +int +ufs_disk_write(struct uufsd *disk) +{ + int fd; + + ERROR(disk, NULL); + + if (disk->d_mine & MINE_WRITE) + return (0); + + fd = open(disk->d_name, O_RDWR); + if (fd < 0) { + ERROR(disk, "failed to open disk for writing"); + return (-1); + } + + close(disk->d_fd); + disk->d_fd = fd; + disk->d_mine |= MINE_WRITE; + + return (0); +} |