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https://github.com/systemd/systemd.git
synced 2024-10-28 20:25:38 +03:00
umount: split out loopback detach code
Like the similar commits, no actual code changes, just splitting up large C files.
This commit is contained in:
parent
b44411c702
commit
2e2c472b1c
198
src/shutdown/detach-loopback.c
Normal file
198
src/shutdown/detach-loopback.c
Normal file
@ -0,0 +1,198 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/***
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Copyright © 2010 ProFUSION embedded systems
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***/
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#include <linux/loop.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#if HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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#include "sd-device.h"
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#include "alloc-util.h"
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#include "blockdev-util.h"
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#include "detach-loopback.h"
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#include "device-util.h"
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#include "fd-util.h"
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#include "umount.h"
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static int loopback_list_get(MountPoint **head) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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sd_device *d;
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int r;
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assert(head);
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r = sd_device_enumerator_new(&e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_allow_uninitialized(e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_subsystem(e, "block", true);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysname(e, "loop*");
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysattr(e, "loop/backing_file", NULL, true);
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if (r < 0)
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return r;
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FOREACH_DEVICE(e, d) {
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_cleanup_free_ char *p = NULL;
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const char *dn;
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MountPoint *lb;
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dev_t devnum;
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if (sd_device_get_devnum(d, &devnum) < 0 ||
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sd_device_get_devname(d, &dn) < 0)
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continue;
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p = strdup(dn);
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if (!p)
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return -ENOMEM;
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lb = new(MountPoint, 1);
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if (!lb)
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return -ENOMEM;
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*lb = (MountPoint) {
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.path = TAKE_PTR(p),
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.devnum = devnum,
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};
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LIST_PREPEND(mount_point, *head, lb);
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}
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return 0;
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}
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static int delete_loopback(const char *device) {
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_cleanup_close_ int fd = -EBADF;
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struct loop_info64 info;
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assert(device);
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fd = open(device, O_RDONLY|O_CLOEXEC);
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if (fd < 0) {
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log_debug_errno(errno, "Failed to open loopback device %s: %m", device);
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return errno == ENOENT ? 0 : -errno;
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}
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/* Loopback block devices don't sync in-flight blocks when we clear the fd, hence sync explicitly
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* first */
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if (fsync(fd) < 0)
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log_debug_errno(errno, "Failed to sync loop block device %s, ignoring: %m", device);
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if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
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if (errno == ENXIO) /* Nothing bound, didn't do anything */
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return 0;
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if (errno != EBUSY)
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return log_debug_errno(errno, "Failed to clear loopback device %s: %m", device);
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if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) {
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if (errno == ENXIO) /* What? Suddenly detached after all? That's fine by us then. */
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return 1;
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log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device);
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return -EBUSY; /* propagate original error */
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}
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#if HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info));
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#endif
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if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR)) /* someone else already set LO_FLAGS_AUTOCLEAR for us? fine by us */
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return -EBUSY; /* propagate original error */
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info.lo_flags |= LO_FLAGS_AUTOCLEAR;
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if (ioctl(fd, LOOP_SET_STATUS64, &info) < 0) {
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if (errno == ENXIO) /* Suddenly detached after all? Fine by us */
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return 1;
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log_debug_errno(errno, "Failed to set LO_FLAGS_AUTOCLEAR flag for loop device %s, ignoring: %m", device);
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} else
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log_debug("Successfully set LO_FLAGS_AUTOCLEAR flag for loop device %s.", device);
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return -EBUSY;
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}
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if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) {
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/* If the LOOP_CLR_FD above succeeded we'll see ENXIO here. */
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if (errno == ENXIO)
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log_debug("Successfully detached loopback device %s.", device);
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else
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log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device); /* the LOOP_CLR_FD at least worked, let's hope for the best */
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return 1;
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}
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#if HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info));
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#endif
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/* Linux makes LOOP_CLR_FD succeed whenever LO_FLAGS_AUTOCLEAR is set without actually doing
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* anything. Very confusing. Let's hence not claim we did anything in this case. */
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if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR))
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log_debug("Successfully called LOOP_CLR_FD on a loopback device %s with autoclear set, which is a NOP.", device);
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else
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log_debug("Weird, LOOP_CLR_FD succeeded but the device is still attached on %s.", device);
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return -EBUSY; /* Nothing changed, the device is still attached, hence it apparently is still busy */
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}
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static int loopback_points_list_detach(MountPoint **head, bool *changed, bool last_try) {
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int n_failed = 0, r;
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dev_t rootdev = 0;
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assert(head);
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assert(changed);
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(void) get_block_device("/", &rootdev);
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LIST_FOREACH(mount_point, m, *head) {
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if (major(rootdev) != 0 && rootdev == m->devnum) {
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n_failed++;
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continue;
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}
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log_info("Detaching loopback %s.", m->path);
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r = delete_loopback(m->path);
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if (r < 0) {
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log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not detach loopback %s: %m", m->path);
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n_failed++;
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continue;
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}
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if (r > 0)
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*changed = true;
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mount_point_free(head, m);
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}
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return n_failed;
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}
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int loopback_detach_all(bool *changed, bool last_try) {
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_cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, loopback_list_head);
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int r;
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assert(changed);
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LIST_HEAD_INIT(loopback_list_head);
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r = loopback_list_get(&loopback_list_head);
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if (r < 0)
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return r;
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return loopback_points_list_detach(&loopback_list_head, changed, last_try);
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}
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10
src/shutdown/detach-loopback.h
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10
src/shutdown/detach-loopback.h
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@ -0,0 +1,10 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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/***
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Copyright © 2010 ProFUSION embedded systems
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***/
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#include <stdbool.h>
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int loopback_detach_all(bool *changed, bool last_try);
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@ -2,6 +2,7 @@
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systemd_shutdown_sources = files(
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'detach-dm.c',
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'detach-loopback.c',
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'detach-md.c',
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'shutdown.c',
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'umount.c',
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@ -24,6 +24,7 @@
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#include "constants.h"
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#include "coredump-util.h"
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#include "detach-dm.h"
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#include "detach-loopback.h"
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#include "detach-md.h"
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#include "errno-util.h"
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#include "exec-util.h"
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@ -5,27 +5,15 @@
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/loop.h>
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#include <sys/mount.h>
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#include <sys/swap.h>
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#include <sys/stat.h>
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#include <sys/swap.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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#include "sd-device.h"
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#include "alloc-util.h"
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#include "blockdev-util.h"
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#include "chase.h"
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#include "constants.h"
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#include "device-util.h"
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#include "devnum-util.h"
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#include "dirent-util.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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@ -36,14 +24,9 @@
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "random-util.h"
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#include "signal-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "sync-util.h"
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#include "umount.h"
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#include "virt.h"
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@ -232,138 +215,6 @@ int swap_list_get(const char *swaps, MountPoint **head) {
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return 0;
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}
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static int loopback_list_get(MountPoint **head) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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sd_device *d;
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int r;
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assert(head);
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r = sd_device_enumerator_new(&e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_allow_uninitialized(e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_subsystem(e, "block", true);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysname(e, "loop*");
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysattr(e, "loop/backing_file", NULL, true);
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if (r < 0)
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return r;
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FOREACH_DEVICE(e, d) {
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_cleanup_free_ char *p = NULL;
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const char *dn;
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MountPoint *lb;
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dev_t devnum;
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if (sd_device_get_devnum(d, &devnum) < 0 ||
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sd_device_get_devname(d, &dn) < 0)
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continue;
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p = strdup(dn);
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if (!p)
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return -ENOMEM;
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lb = new(MountPoint, 1);
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if (!lb)
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return -ENOMEM;
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*lb = (MountPoint) {
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.path = TAKE_PTR(p),
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.devnum = devnum,
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};
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LIST_PREPEND(mount_point, *head, lb);
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}
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return 0;
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}
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static int delete_loopback(const char *device) {
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_cleanup_close_ int fd = -EBADF;
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struct loop_info64 info;
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assert(device);
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fd = open(device, O_RDONLY|O_CLOEXEC);
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if (fd < 0) {
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log_debug_errno(errno, "Failed to open loopback device %s: %m", device);
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return errno == ENOENT ? 0 : -errno;
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}
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/* Loopback block devices don't sync in-flight blocks when we clear the fd, hence sync explicitly
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* first */
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if (fsync(fd) < 0)
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log_debug_errno(errno, "Failed to sync loop block device %s, ignoring: %m", device);
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if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
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if (errno == ENXIO) /* Nothing bound, didn't do anything */
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return 0;
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if (errno != EBUSY)
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return log_debug_errno(errno, "Failed to clear loopback device %s: %m", device);
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if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) {
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if (errno == ENXIO) /* What? Suddenly detached after all? That's fine by us then. */
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return 1;
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log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device);
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return -EBUSY; /* propagate original error */
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}
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#if HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info));
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#endif
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if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR)) /* someone else already set LO_FLAGS_AUTOCLEAR for us? fine by us */
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return -EBUSY; /* propagate original error */
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info.lo_flags |= LO_FLAGS_AUTOCLEAR;
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if (ioctl(fd, LOOP_SET_STATUS64, &info) < 0) {
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if (errno == ENXIO) /* Suddenly detached after all? Fine by us */
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return 1;
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log_debug_errno(errno, "Failed to set LO_FLAGS_AUTOCLEAR flag for loop device %s, ignoring: %m", device);
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} else
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log_debug("Successfully set LO_FLAGS_AUTOCLEAR flag for loop device %s.", device);
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return -EBUSY;
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}
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if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) {
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/* If the LOOP_CLR_FD above succeeded we'll see ENXIO here. */
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if (errno == ENXIO)
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log_debug("Successfully detached loopback device %s.", device);
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else
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log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device); /* the LOOP_CLR_FD at least worked, let's hope for the best */
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return 1;
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}
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#if HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info));
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#endif
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/* Linux makes LOOP_CLR_FD succeed whenever LO_FLAGS_AUTOCLEAR is set without actually doing
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* anything. Very confusing. Let's hence not claim we did anything in this case. */
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if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR))
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log_debug("Successfully called LOOP_CLR_FD on a loopback device %s with autoclear set, which is a NOP.", device);
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else
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log_debug("Weird, LOOP_CLR_FD succeeded but the device is still attached on %s.", device);
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return -EBUSY; /* Nothing changed, the device is still attached, hence it apparently is still busy */
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}
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static bool nonunmountable_path(const char *path) {
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return path_equal(path, "/")
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#if ! HAVE_SPLIT_USR
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@ -679,37 +530,6 @@ static int swap_points_list_off(MountPoint **head, bool *changed) {
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return n_failed;
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}
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static int loopback_points_list_detach(MountPoint **head, bool *changed, bool last_try) {
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int n_failed = 0, r;
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dev_t rootdev = 0;
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assert(head);
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assert(changed);
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(void) get_block_device("/", &rootdev);
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LIST_FOREACH(mount_point, m, *head) {
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if (major(rootdev) != 0 && rootdev == m->devnum) {
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n_failed++;
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continue;
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}
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log_info("Detaching loopback %s.", m->path);
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r = delete_loopback(m->path);
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if (r < 0) {
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log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not detach loopback %s: %m", m->path);
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n_failed++;
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continue;
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}
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if (r > 0)
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*changed = true;
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mount_point_free(head, m);
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}
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return n_failed;
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}
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static int umount_all_once(bool *changed, bool last_try) {
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_cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, mp_list_head);
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int r;
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@ -757,18 +577,3 @@ int swapoff_all(bool *changed) {
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return swap_points_list_off(&swap_list_head, changed);
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}
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int loopback_detach_all(bool *changed, bool last_try) {
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_cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, loopback_list_head);
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int r;
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assert(changed);
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LIST_HEAD_INIT(loopback_list_head);
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r = loopback_list_get(&loopback_list_head);
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if (r < 0)
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return r;
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return loopback_points_list_detach(&loopback_list_head, changed, last_try);
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}
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@ -9,7 +9,6 @@
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int umount_all(bool *changed, bool last_try);
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int swapoff_all(bool *changed);
|
||||
int loopback_detach_all(bool *changed, bool last_try);
|
||||
|
||||
/* This is exported just for testing */
|
||||
typedef struct MountPoint {
|
||||
|
Loading…
Reference in New Issue
Block a user