source: branches/stable/mindi-busybox/libbb/loop.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 13 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 4.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * Copyright (C) 2005 by Rob Landley <rob@landley.net>
7 *
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9 */
10
11#include "libbb.h"
12
13/* For 2.6, use the cleaned up header to get the 64 bit API. */
14#include <linux/version.h>
15#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
16#include <linux/loop.h>
17typedef struct loop_info64 bb_loop_info;
18#define BB_LOOP_SET_STATUS LOOP_SET_STATUS64
19#define BB_LOOP_GET_STATUS LOOP_GET_STATUS64
20
21/* For 2.4 and earlier, use the 32 bit API (and don't trust the headers) */
22#else
23/* Stuff stolen from linux/loop.h for 2.4 and earlier kernels*/
24#include <linux/posix_types.h>
25#define LO_NAME_SIZE        64
26#define LO_KEY_SIZE         32
27#define LOOP_SET_FD         0x4C00
28#define LOOP_CLR_FD         0x4C01
29#define BB_LOOP_SET_STATUS  0x4C02
30#define BB_LOOP_GET_STATUS  0x4C03
31typedef struct {
32    int                lo_number;
33    __kernel_dev_t     lo_device;
34    unsigned long      lo_inode;
35    __kernel_dev_t     lo_rdevice;
36    int                lo_offset;
37    int                lo_encrypt_type;
38    int                lo_encrypt_key_size;
39    int                lo_flags;
40    char               lo_file_name[LO_NAME_SIZE];
41    unsigned char      lo_encrypt_key[LO_KEY_SIZE];
42    unsigned long      lo_init[2];
43    char               reserved[4];
44} bb_loop_info;
45#endif
46
47char *query_loop(const char *device)
48{
49    int fd;
50    bb_loop_info loopinfo;
51    char *dev = 0;
52
53    fd = open(device, O_RDONLY);
54    if (fd < 0) return 0;
55    if (!ioctl(fd, BB_LOOP_GET_STATUS, &loopinfo))
56        dev = xasprintf("%ld %s", (long) loopinfo.lo_offset,
57                (char *)loopinfo.lo_file_name);
58    close(fd);
59
60    return dev;
61}
62
63
64int del_loop(const char *device)
65{
66    int fd, rc;
67
68    fd = open(device, O_RDONLY);
69    if (fd < 0) return 1;
70    rc = ioctl(fd, LOOP_CLR_FD, 0);
71    close(fd);
72
73    return rc;
74}
75
76/* Returns 0 if mounted RW, 1 if mounted read-only, <0 for error.
77   *device is loop device to use, or if *device==NULL finds a loop device to
78   mount it on and sets *device to a strdup of that loop device name.  This
79   search will re-use an existing loop device already bound to that
80   file/offset if it finds one.
81 */
82int set_loop(char **device, const char *file, unsigned long long offset)
83{
84    char dev[LOOP_NAMESIZE];
85    char *try;
86    bb_loop_info loopinfo;
87    struct stat statbuf;
88    int i, dfd, ffd, mode, rc = -1;
89
90    /* Open the file.  Barf if this doesn't work.  */
91    mode = O_RDWR;
92    ffd = open(file, mode);
93    if (ffd < 0) {
94        mode = O_RDONLY;
95        ffd = open(file, mode);
96        if (ffd < 0)
97            return -errno;
98    }
99
100    /* Find a loop device.  */
101    try = *device ? : dev;
102    for (i = 0; rc; i++) {
103        sprintf(dev, LOOP_FORMAT, i);
104
105        /* Ran out of block devices, return failure.  */
106        if (stat(try, &statbuf) || !S_ISBLK(statbuf.st_mode)) {
107            rc = -ENOENT;
108            break;
109        }
110        /* Open the sucker and check its loopiness.  */
111        dfd = open(try, mode);
112        if (dfd < 0 && errno == EROFS) {
113            mode = O_RDONLY;
114            dfd = open(try, mode);
115        }
116        if (dfd < 0)
117            goto try_again;
118
119        rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);
120
121        /* If device is free, claim it.  */
122        if (rc && errno == ENXIO) {
123            memset(&loopinfo, 0, sizeof(loopinfo));
124            safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE);
125            loopinfo.lo_offset = offset;
126            /* Associate free loop device with file.  */
127            if (!ioctl(dfd, LOOP_SET_FD, ffd)) {
128                if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo))
129                    rc = 0;
130                else
131                    ioctl(dfd, LOOP_CLR_FD, 0);
132            }
133
134        /* If this block device already set up right, re-use it.
135           (Yes this is racy, but associating two loop devices with the same
136           file isn't pretty either.  In general, mounting the same file twice
137           without using losetup manually is problematic.)
138         */
139        } else if (strcmp(file, (char *)loopinfo.lo_file_name) != 0
140        || offset != loopinfo.lo_offset) {
141            rc = -1;
142        }
143        close(dfd);
144 try_again:
145        if (*device) break;
146    }
147    close(ffd);
148    if (!rc) {
149        if (!*device)
150            *device = xstrdup(dev);
151        return (mode == O_RDONLY); /* 1:ro, 0:rw */
152    }
153    return rc;
154}
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