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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include "cvmfs_config.h" |
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#include "auto_umount.h" |
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#include <dirent.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <map> |
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#include <set> |
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#include <string> |
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#include <vector> |
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#include "util/logging.h" |
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#include "util/platform.h" |
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#include "util/posix.h" |
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using namespace std; // NOLINT |
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namespace auto_umount { |
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string *mountpoint_ = NULL; |
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void SetMountpoint(const string &mountpoint) { |
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if (mountpoint == "") { |
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delete mountpoint_; |
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mountpoint_ = NULL; |
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} else { |
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mountpoint_ = new string(mountpoint); |
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} |
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} |
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void UmountOnCrash() { |
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if (!mountpoint_) { |
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LogCvmfs(kLogCvmfs, kLogSyslogErr, "crash cleanup handler: no mountpoint"); |
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return; |
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} |
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std::vector<std::string> all_mountpoints = platform_mountlist(); |
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if (all_mountpoints.empty()) { |
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LogCvmfs(kLogCvmfs, kLogSyslogErr, "crash cleanup handler: " |
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"failed to read mount point list"); |
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return; |
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} |
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// Mitigate auto-mount - crash - umount - auto-mount loops |
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SafeSleepMs(2000); |
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// Check if *mountpoint_ is still mounted |
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// (we don't want to trigger a mount by immediately doing stat *mountpoint_) |
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bool still_mounted = false; |
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for (unsigned i = 0; i < all_mountpoints.size(); ++i) { |
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if (*mountpoint_ == all_mountpoints[i]) { |
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still_mounted = true; |
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break; |
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} |
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} |
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if (!still_mounted) { |
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LogCvmfs(kLogCvmfs, kLogSyslog, "crash cleanup handler: %s not mounted", |
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mountpoint_->c_str()); |
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return; |
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} |
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// stat() might be served from caches. Opendir ensures fuse module is called. |
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int expected_error; |
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#ifdef __APPLE__ |
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expected_error = ENXIO; |
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#else |
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expected_error = ENOTCONN; |
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#endif |
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DIR *dirp = opendir(mountpoint_->c_str()); |
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if (dirp || (errno != expected_error)) { |
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if (dirp) closedir(dirp); |
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LogCvmfs(kLogCvmfs, kLogSyslog, "crash cleanup handler: " |
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"%s seems not to be stalled (%d)", mountpoint_->c_str(), errno); |
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return; |
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} |
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// sudo umount -l *mountpoint_ |
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if (!SwitchCredentials(0, getegid(), true)) { |
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LogCvmfs(kLogCvmfs, kLogSyslogErr, "crash cleanup handler: " |
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"failed to re-gain root privileges"); |
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return; |
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} |
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const bool lazy = true; |
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bool retval = platform_umount(mountpoint_->c_str(), lazy); |
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if (!retval) { |
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LogCvmfs(kLogCvmfs, kLogSyslogErr, "crash cleanup handler: " |
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"failed to unmount %s", mountpoint_->c_str()); |
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return; |
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} |
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LogCvmfs(kLogCvmfs, kLogSyslog, "crash cleanup handler unmounted stalled %s", |
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mountpoint_->c_str()); |
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} |
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} // namespace auto_umount |
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