| Line |
Branch |
Exec |
Source |
| 1 |
|
|
/** |
| 2 |
|
|
* This file is part of the CernVM File System. |
| 3 |
|
|
*/ |
| 4 |
|
|
|
| 5 |
|
|
|
| 6 |
|
|
#include "auto_umount.h" |
| 7 |
|
|
|
| 8 |
|
|
#include <dirent.h> |
| 9 |
|
|
#include <errno.h> |
| 10 |
|
|
#include <sys/types.h> |
| 11 |
|
|
#include <unistd.h> |
| 12 |
|
|
|
| 13 |
|
|
#include <string> |
| 14 |
|
|
#include <vector> |
| 15 |
|
|
|
| 16 |
|
|
#include "util/capabilities.h" |
| 17 |
|
|
#include "util/logging.h" |
| 18 |
|
|
#include "util/platform.h" |
| 19 |
|
|
#include "util/posix.h" |
| 20 |
|
|
|
| 21 |
|
|
using namespace std; // NOLINT |
| 22 |
|
|
|
| 23 |
|
|
namespace auto_umount { |
| 24 |
|
|
|
| 25 |
|
|
string *mountpoint_ = NULL; |
| 26 |
|
|
|
| 27 |
|
✗ |
void SetMountpoint(const string &mountpoint) { |
| 28 |
|
✗ |
if (mountpoint == "") { |
| 29 |
|
✗ |
delete mountpoint_; |
| 30 |
|
✗ |
mountpoint_ = NULL; |
| 31 |
|
|
} else { |
| 32 |
|
✗ |
mountpoint_ = new string(mountpoint); |
| 33 |
|
|
} |
| 34 |
|
|
} |
| 35 |
|
|
|
| 36 |
|
|
|
| 37 |
|
✗ |
void UmountOnExit(const bool crashed) { |
| 38 |
|
✗ |
const char *cleanuptype = "exit"; |
| 39 |
|
✗ |
if (crashed) |
| 40 |
|
✗ |
cleanuptype = "crash"; |
| 41 |
|
|
|
| 42 |
|
✗ |
if (!mountpoint_) { |
| 43 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslogErr, |
| 44 |
|
|
"%s cleanup handler: no mountpoint", |
| 45 |
|
|
cleanuptype); |
| 46 |
|
✗ |
return; |
| 47 |
|
|
} |
| 48 |
|
|
|
| 49 |
|
✗ |
std::vector<std::string> all_mountpoints = platform_mountlist(); |
| 50 |
|
✗ |
if (all_mountpoints.empty()) { |
| 51 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslogErr, |
| 52 |
|
|
"%s cleanup handler: " |
| 53 |
|
|
"failed to read mount point list", |
| 54 |
|
|
cleanuptype); |
| 55 |
|
✗ |
return; |
| 56 |
|
|
} |
| 57 |
|
|
|
| 58 |
|
✗ |
if (crashed) { |
| 59 |
|
|
// Mitigate auto-mount - crash - umount - auto-mount loops |
| 60 |
|
✗ |
SafeSleepMs(2000); |
| 61 |
|
|
} |
| 62 |
|
|
|
| 63 |
|
|
// Check if *mountpoint_ is still mounted |
| 64 |
|
|
// (we don't want to trigger a mount by immediately doing stat *mountpoint_) |
| 65 |
|
✗ |
bool still_mounted = false; |
| 66 |
|
✗ |
for (unsigned i = 0; i < all_mountpoints.size(); ++i) { |
| 67 |
|
✗ |
if (*mountpoint_ == all_mountpoints[i]) { |
| 68 |
|
✗ |
still_mounted = true; |
| 69 |
|
✗ |
break; |
| 70 |
|
|
} |
| 71 |
|
|
} |
| 72 |
|
✗ |
if (!still_mounted) { |
| 73 |
|
✗ |
int logtype = kLogDebug; |
| 74 |
|
✗ |
if (crashed) |
| 75 |
|
✗ |
logtype = kLogSyslog; |
| 76 |
|
✗ |
LogCvmfs(kLogCvmfs, logtype, |
| 77 |
|
|
"%s cleanup handler: %s not mounted", |
| 78 |
|
|
cleanuptype, mountpoint_->c_str()); |
| 79 |
|
✗ |
return; |
| 80 |
|
|
} |
| 81 |
|
|
|
| 82 |
|
✗ |
if (crashed) { |
| 83 |
|
|
// stat() might be served from caches. Opendir ensures fuse module is called. |
| 84 |
|
|
int expected_error; |
| 85 |
|
|
#ifdef __APPLE__ |
| 86 |
|
|
expected_error = ENXIO; |
| 87 |
|
|
#else |
| 88 |
|
✗ |
expected_error = ENOTCONN; |
| 89 |
|
|
#endif |
| 90 |
|
✗ |
DIR *dirp = opendir(mountpoint_->c_str()); |
| 91 |
|
✗ |
if (dirp || (errno != expected_error)) { |
| 92 |
|
✗ |
if (dirp) |
| 93 |
|
✗ |
closedir(dirp); |
| 94 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslog, "crash cleanup handler: " |
| 95 |
|
|
"%s seems not to be stalled (%d)", |
| 96 |
|
✗ |
mountpoint_->c_str(), errno); |
| 97 |
|
✗ |
return; |
| 98 |
|
|
} |
| 99 |
|
|
} |
| 100 |
|
|
|
| 101 |
|
|
// sudo umount -l *mountpoint_ |
| 102 |
|
✗ |
if (!ObtainSysAdminCapability()) { |
| 103 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslogErr, |
| 104 |
|
|
"%s cleanup handler: " |
| 105 |
|
|
"failed to re-gain sys_admin capability", |
| 106 |
|
|
cleanuptype); |
| 107 |
|
✗ |
return; |
| 108 |
|
|
} |
| 109 |
|
✗ |
const bool lazy = true; |
| 110 |
|
✗ |
bool const retval = platform_umount(mountpoint_->c_str(), lazy); |
| 111 |
|
✗ |
if (!retval) { |
| 112 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslogErr, |
| 113 |
|
|
"%s cleanup handler: " |
| 114 |
|
|
"failed to unmount %s", |
| 115 |
|
|
cleanuptype, mountpoint_->c_str()); |
| 116 |
|
✗ |
return; |
| 117 |
|
|
} |
| 118 |
|
|
|
| 119 |
|
✗ |
if (crashed) { |
| 120 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslog, |
| 121 |
|
|
"crash cleanup handler unmounted stalled %s", |
| 122 |
|
|
mountpoint_->c_str()); |
| 123 |
|
|
} else { |
| 124 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslog, |
| 125 |
|
|
"exit cleanup handler unmounted %s", |
| 126 |
|
|
mountpoint_->c_str()); |
| 127 |
|
|
} |
| 128 |
|
|
} |
| 129 |
|
|
|
| 130 |
|
|
} // namespace auto_umount |
| 131 |
|
|
|