| Line |
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Source |
| 1 |
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/** |
| 2 |
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* This file is part of the CernVM File System. |
| 3 |
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*/ |
| 4 |
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| 5 |
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| 6 |
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#include "fuse_remount.h" |
| 7 |
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| 8 |
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#include <errno.h> |
| 9 |
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#include <poll.h> |
| 10 |
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#include <unistd.h> |
| 11 |
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| 12 |
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#include <cassert> |
| 13 |
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#include <cstdlib> |
| 14 |
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#include <cstring> |
| 15 |
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| 16 |
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#include "backoff.h" |
| 17 |
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#include "catalog_mgr_client.h" |
| 18 |
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#include "fuse_inode_gen.h" |
| 19 |
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#include "lru_md.h" |
| 20 |
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#include "mountpoint.h" |
| 21 |
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#include "util/exception.h" |
| 22 |
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#include "util/logging.h" |
| 23 |
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#include "util/posix.h" |
| 24 |
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| 25 |
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using namespace std; // NOLINT |
| 26 |
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| 27 |
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| 28 |
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✗ |
FuseRemounter::Status FuseRemounter::ChangeRoot(const shash::Any &root_hash) { |
| 29 |
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✗ |
if (mountpoint_->catalog_mgr()->GetRootHash() == root_hash) |
| 30 |
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✗ |
return kStatusUp2Date; |
| 31 |
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| 32 |
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✗ |
const FenceGuard fence_guard(&fence_maintenance_); |
| 33 |
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✗ |
if (IsInMaintenanceMode()) |
| 34 |
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✗ |
return kStatusMaintenance; |
| 35 |
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| 36 |
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✗ |
int32_t expected_val = 0; |
| 37 |
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✗ |
if (drainout_mode_.compare_exchange_strong(expected_val, 1)) { |
| 38 |
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// As of this point, fuse callbacks return zero as cache timeout |
| 39 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "chroot, draining out meta-data caches"); |
| 40 |
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✗ |
invalidator_handle_.Reset(); |
| 41 |
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✗ |
invalidator_->InvalidateInodes(&invalidator_handle_); |
| 42 |
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✗ |
drainout_mode_.fetch_add(1); |
| 43 |
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// drainout_mode_ == 2, IsInDrainoutMode is now 'true' |
| 44 |
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} else { |
| 45 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "already in drainout mode, leaving"); |
| 46 |
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✗ |
return kStatusDraining; |
| 47 |
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} |
| 48 |
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| 49 |
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✗ |
int32_t drainout_code = 0; |
| 50 |
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✗ |
BackoffThrottle throttle; |
| 51 |
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do { |
| 52 |
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✗ |
TryFinish(root_hash); |
| 53 |
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✗ |
drainout_code = drainout_mode_.load(); |
| 54 |
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✗ |
if (drainout_code == 0) |
| 55 |
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✗ |
break; |
| 56 |
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✗ |
throttle.Throttle(); |
| 57 |
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} while (true); |
| 58 |
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| 59 |
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✗ |
if (mountpoint_->catalog_mgr()->GetRootHash() == root_hash) |
| 60 |
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✗ |
return kStatusUp2Date; |
| 61 |
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✗ |
return kStatusFailGeneral; |
| 62 |
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} |
| 63 |
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| 64 |
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| 65 |
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/** |
| 66 |
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* Executed by the trigger thread, or triggered from cvmfs_talk. Moves into |
| 67 |
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* drainout mode if a new catalog is available online. |
| 68 |
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*/ |
| 69 |
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✗ |
FuseRemounter::Status FuseRemounter::Check() { |
| 70 |
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✗ |
const FenceGuard fence_guard(&fence_maintenance_); |
| 71 |
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✗ |
if (IsInMaintenanceMode()) |
| 72 |
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✗ |
return kStatusMaintenance; |
| 73 |
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| 74 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, |
| 75 |
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"catalog TTL expired, checking revision against blacklists"); |
| 76 |
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✗ |
if (mountpoint_->ReloadBlacklists() |
| 77 |
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✗ |
&& mountpoint_->catalog_mgr()->IsRevisionBlacklisted()) { |
| 78 |
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✗ |
PANIC(kLogDebug | kLogSyslogErr, |
| 79 |
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"repository revision blacklisted, aborting"); |
| 80 |
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} |
| 81 |
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| 82 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "remounting root catalog"); |
| 83 |
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✗ |
const catalog::LoadReturn retval = mountpoint_->catalog_mgr() |
| 84 |
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✗ |
->RemountDryrun(); |
| 85 |
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✗ |
switch (retval) { |
| 86 |
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✗ |
case catalog::kLoadNew: { |
| 87 |
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✗ |
SetOfflineMode(false); |
| 88 |
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✗ |
int32_t expected_val = 0; |
| 89 |
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✗ |
if (drainout_mode_.compare_exchange_strong(expected_val, 1)) { |
| 90 |
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// As of this point, fuse callbacks return zero as cache timeout |
| 91 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, |
| 92 |
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"new catalog revision available, " |
| 93 |
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"draining out meta-data caches"); |
| 94 |
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✗ |
invalidator_handle_.Reset(); |
| 95 |
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✗ |
invalidator_->InvalidateInodes(&invalidator_handle_); |
| 96 |
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✗ |
drainout_mode_.fetch_add(1); |
| 97 |
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// drainout_mode_ == 2, IsInDrainoutMode is now 'true' |
| 98 |
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} else { |
| 99 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "already in drainout mode, leaving"); |
| 100 |
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} |
| 101 |
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✗ |
return kStatusDraining; |
| 102 |
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} |
| 103 |
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✗ |
case catalog::kLoadFail: |
| 104 |
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case catalog::kLoadNoSpace: |
| 105 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, |
| 106 |
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"reload failed (%s), applying short term TTL", |
| 107 |
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catalog::Code2Ascii(retval)); |
| 108 |
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✗ |
SetOfflineMode(true); |
| 109 |
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✗ |
catalogs_valid_until_ = time(NULL) + MountPoint::kShortTermTTL; |
| 110 |
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✗ |
SetAlarm(MountPoint::kShortTermTTL); |
| 111 |
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✗ |
return (retval == catalog::kLoadFail) ? kStatusFailGeneral |
| 112 |
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✗ |
: kStatusFailNoSpace; |
| 113 |
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✗ |
case catalog::kLoadUp2Date: { |
| 114 |
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✗ |
LogCvmfs(kLogCvmfs, kLogDebug, |
| 115 |
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"catalog up to date (could be offline mode)"); |
| 116 |
|
✗ |
SetOfflineMode(mountpoint_->catalog_mgr()->offline_mode()); |
| 117 |
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✗ |
const unsigned ttl = offline_mode_ ? MountPoint::kShortTermTTL |
| 118 |
|
✗ |
: mountpoint_->GetEffectiveTtlSec(); |
| 119 |
|
✗ |
catalogs_valid_until_ = time(NULL) + ttl; |
| 120 |
|
✗ |
SetAlarm(ttl); |
| 121 |
|
✗ |
return kStatusUp2Date; |
| 122 |
|
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} |
| 123 |
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✗ |
default: |
| 124 |
|
✗ |
PANIC(NULL); |
| 125 |
|
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} |
| 126 |
|
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} |
| 127 |
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| 128 |
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| 129 |
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/** |
| 130 |
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* Used from the TalkManager. Continuously calls 'check' until it returns with |
| 131 |
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* "up to date" or a failure. |
| 132 |
|
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*/ |
| 133 |
|
✗ |
FuseRemounter::Status FuseRemounter::CheckSynchronously() { |
| 134 |
|
✗ |
BackoffThrottle throttle; |
| 135 |
|
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while (true) { |
| 136 |
|
✗ |
const Status status = Check(); |
| 137 |
|
✗ |
switch (status) { |
| 138 |
|
✗ |
case kStatusDraining: |
| 139 |
|
✗ |
TryFinish(); |
| 140 |
|
✗ |
break; |
| 141 |
|
✗ |
default: |
| 142 |
|
✗ |
return status; |
| 143 |
|
|
} |
| 144 |
|
✗ |
throttle.Throttle(); |
| 145 |
|
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} |
| 146 |
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} |
| 147 |
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| 148 |
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| 149 |
|
✗ |
void FuseRemounter::EnterMaintenanceMode() { |
| 150 |
|
✗ |
fence_maintenance_.Drain(); |
| 151 |
|
✗ |
int32_t expected_val = 0; |
| 152 |
|
✗ |
maintenance_mode_.compare_exchange_strong(expected_val, 1); |
| 153 |
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✗ |
fence_maintenance_.Open(); |
| 154 |
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| 155 |
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// All running Check() and TryFinish() methods returned. Both methods now |
| 156 |
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// return immediately as noops. |
| 157 |
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| 158 |
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// Flush caches before reload of fuse module |
| 159 |
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✗ |
invalidator_handle_.Reset(); |
| 160 |
|
✗ |
invalidator_->InvalidateInodes(&invalidator_handle_); |
| 161 |
|
✗ |
invalidator_handle_.WaitFor(); |
| 162 |
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} |
| 163 |
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| 164 |
|
✗ |
FuseRemounter::FuseRemounter(MountPoint *mountpoint, |
| 165 |
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cvmfs::InodeGenerationInfo *inode_generation_info, |
| 166 |
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struct fuse_session **fuse_session, |
| 167 |
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✗ |
bool fuse_notify_invalidation) |
| 168 |
|
✗ |
: mountpoint_(mountpoint) |
| 169 |
|
✗ |
, inode_generation_info_(inode_generation_info) |
| 170 |
|
✗ |
, invalidator_(new FuseInvalidator(mountpoint, fuse_session, |
| 171 |
|
✗ |
fuse_notify_invalidation)) |
| 172 |
|
✗ |
, invalidator_handle_(static_cast<int>(mountpoint->kcache_timeout_sec())) |
| 173 |
|
✗ |
, fence_(new Fence()) |
| 174 |
|
✗ |
, offline_mode_(false) |
| 175 |
|
✗ |
, catalogs_valid_until_(MountPoint::kIndefiniteDeadline) { |
| 176 |
|
✗ |
memset(&thread_remount_trigger_, 0, sizeof(thread_remount_trigger_)); |
| 177 |
|
✗ |
pipe_remount_trigger_[0] = pipe_remount_trigger_[1] = -1; |
| 178 |
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✗ |
drainout_mode_.store(0); |
| 179 |
|
✗ |
maintenance_mode_.store(0); |
| 180 |
|
✗ |
critical_section_.store(0); |
| 181 |
|
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} |
| 182 |
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| 183 |
|
✗ |
FuseRemounter::~FuseRemounter() { |
| 184 |
|
✗ |
if (HasRemountTrigger()) { |
| 185 |
|
✗ |
char quit = 'Q'; |
| 186 |
|
✗ |
WritePipe(pipe_remount_trigger_[1], &quit, 1); |
| 187 |
|
✗ |
pthread_join(thread_remount_trigger_, NULL); |
| 188 |
|
✗ |
ClosePipe(pipe_remount_trigger_); |
| 189 |
|
|
} |
| 190 |
|
✗ |
delete invalidator_; |
| 191 |
|
✗ |
delete fence_; |
| 192 |
|
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} |
| 193 |
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| 194 |
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| 195 |
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/** |
| 196 |
|
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* Triggers the Check() method when the catalog TTL expires. Works essentially |
| 197 |
|
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* as an alarm() timer. |
| 198 |
|
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*/ |
| 199 |
|
✗ |
void *FuseRemounter::MainRemountTrigger(void *data) { |
| 200 |
|
✗ |
FuseRemounter *remounter = reinterpret_cast<FuseRemounter *>(data); |
| 201 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "starting remount trigger"); |
| 202 |
|
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char c; |
| 203 |
|
✗ |
int timeout_ms = -1; |
| 204 |
|
✗ |
uint64_t deadline = 0; |
| 205 |
|
|
struct pollfd watch_ctrl; |
| 206 |
|
✗ |
watch_ctrl.fd = remounter->pipe_remount_trigger_[0]; |
| 207 |
|
✗ |
watch_ctrl.events = POLLIN | POLLPRI; |
| 208 |
|
|
while (true) { |
| 209 |
|
✗ |
watch_ctrl.revents = 0; |
| 210 |
|
✗ |
const int retval = poll(&watch_ctrl, 1, timeout_ms); |
| 211 |
|
✗ |
if (retval < 0) { |
| 212 |
|
✗ |
if (errno == EINTR) { |
| 213 |
|
✗ |
if (timeout_ms >= 0) { |
| 214 |
|
✗ |
const uint64_t now = platform_monotonic_time(); |
| 215 |
|
✗ |
timeout_ms = (now > deadline) ? 0 : (deadline - now) * 1000; |
| 216 |
|
|
} |
| 217 |
|
✗ |
continue; |
| 218 |
|
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} |
| 219 |
|
✗ |
PANIC(kLogSyslogErr | kLogDebug, |
| 220 |
|
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"remount trigger connection failure (%d)", errno); |
| 221 |
|
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} |
| 222 |
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|
| 223 |
|
✗ |
if (retval == 0) { |
| 224 |
|
✗ |
remounter->Check(); |
| 225 |
|
✗ |
timeout_ms = -1; |
| 226 |
|
✗ |
continue; |
| 227 |
|
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} |
| 228 |
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|
| 229 |
|
✗ |
assert(watch_ctrl.revents != 0); |
| 230 |
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|
| 231 |
|
✗ |
ReadPipe(remounter->pipe_remount_trigger_[0], &c, 1); |
| 232 |
|
✗ |
if (c == 'Q') |
| 233 |
|
✗ |
break; |
| 234 |
|
✗ |
assert(c == 'T'); |
| 235 |
|
✗ |
ReadPipe(remounter->pipe_remount_trigger_[0], &timeout_ms, sizeof(int)); |
| 236 |
|
✗ |
deadline = platform_monotonic_time() + timeout_ms / 1000; |
| 237 |
|
|
} |
| 238 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "stopping remount trigger"); |
| 239 |
|
✗ |
return NULL; |
| 240 |
|
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} |
| 241 |
|
|
|
| 242 |
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|
| 243 |
|
✗ |
void FuseRemounter::SetAlarm(int timeout) { |
| 244 |
|
|
// Remounting could be called for a non auto-update repository |
| 245 |
|
✗ |
if (!HasRemountTrigger()) |
| 246 |
|
✗ |
return; |
| 247 |
|
|
|
| 248 |
|
✗ |
timeout *= 1000; // timeout given in ms |
| 249 |
|
✗ |
const unsigned buf_size = 1 + sizeof(int); |
| 250 |
|
|
char buf[buf_size]; |
| 251 |
|
✗ |
buf[0] = 'T'; |
| 252 |
|
✗ |
memcpy(&buf[1], &timeout, sizeof(timeout)); |
| 253 |
|
✗ |
WritePipe(pipe_remount_trigger_[1], buf, buf_size); |
| 254 |
|
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} |
| 255 |
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|
| 256 |
|
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|
| 257 |
|
✗ |
void FuseRemounter::SetOfflineMode(bool value) { |
| 258 |
|
✗ |
if (value == offline_mode_) |
| 259 |
|
✗ |
return; |
| 260 |
|
✗ |
offline_mode_ = value; |
| 261 |
|
|
|
| 262 |
|
✗ |
if (offline_mode_) { |
| 263 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogDebug | kLogSyslogWarn, |
| 264 |
|
|
"warning, could not apply updated catalog revision, " |
| 265 |
|
|
"entering offline mode"); |
| 266 |
|
✗ |
mountpoint_->file_system()->io_error_info()->AddIoError(); |
| 267 |
|
|
} else { |
| 268 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogDebug | kLogSyslog, "recovered from offline mode"); |
| 269 |
|
|
} |
| 270 |
|
|
} |
| 271 |
|
|
|
| 272 |
|
|
|
| 273 |
|
✗ |
void FuseRemounter::Spawn() { |
| 274 |
|
✗ |
invalidator_->Spawn(); |
| 275 |
|
✗ |
if (!mountpoint_->fixed_catalog()) { |
| 276 |
|
✗ |
MakePipe(pipe_remount_trigger_); |
| 277 |
|
✗ |
const int retval = pthread_create(&thread_remount_trigger_, NULL, |
| 278 |
|
|
MainRemountTrigger, this); |
| 279 |
|
✗ |
assert(retval == 0); |
| 280 |
|
|
|
| 281 |
|
✗ |
SetOfflineMode(mountpoint_->catalog_mgr()->offline_mode()); |
| 282 |
|
✗ |
const unsigned ttl = offline_mode_ ? MountPoint::kShortTermTTL |
| 283 |
|
✗ |
: mountpoint_->GetEffectiveTtlSec(); |
| 284 |
|
✗ |
catalogs_valid_until_ = time(NULL) + ttl; |
| 285 |
|
✗ |
SetAlarm(ttl); |
| 286 |
|
|
} |
| 287 |
|
|
} |
| 288 |
|
|
|
| 289 |
|
|
|
| 290 |
|
|
/** |
| 291 |
|
|
* Applies a previously started remount operation. This is called from the |
| 292 |
|
|
* fuse callbacks or from CheckSynchronously(). Usually, the method quits |
| 293 |
|
|
* immediately except when a new catalog is available and the kernel caches are |
| 294 |
|
|
* flushed. |
| 295 |
|
|
*/ |
| 296 |
|
✗ |
void FuseRemounter::TryFinish(const shash::Any &root_hash) { |
| 297 |
|
✗ |
const FenceGuard fence_guard(&fence_maintenance_); |
| 298 |
|
✗ |
if (IsInMaintenanceMode()) |
| 299 |
|
✗ |
return; |
| 300 |
|
✗ |
if (!EnterCriticalSection()) |
| 301 |
|
✗ |
return; |
| 302 |
|
✗ |
if (!IsInDrainoutMode()) { |
| 303 |
|
✗ |
LeaveCriticalSection(); |
| 304 |
|
✗ |
return; |
| 305 |
|
|
} |
| 306 |
|
|
|
| 307 |
|
|
// No one else is in this code path and we have a valid FuseInvalidator handle |
| 308 |
|
|
|
| 309 |
|
✗ |
if (!invalidator_handle_.IsDone()) { |
| 310 |
|
✗ |
LeaveCriticalSection(); |
| 311 |
|
✗ |
return; |
| 312 |
|
|
} |
| 313 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogDebug, "caches drained out, applying new catalog"); |
| 314 |
|
|
|
| 315 |
|
|
// No new inserts into caches |
| 316 |
|
✗ |
mountpoint_->inode_cache()->Pause(); |
| 317 |
|
✗ |
mountpoint_->path_cache()->Pause(); |
| 318 |
|
✗ |
mountpoint_->md5path_cache()->Pause(); |
| 319 |
|
✗ |
mountpoint_->inode_cache()->Drop(); |
| 320 |
|
✗ |
mountpoint_->path_cache()->Drop(); |
| 321 |
|
✗ |
mountpoint_->md5path_cache()->Drop(); |
| 322 |
|
|
|
| 323 |
|
|
// Ensure that all Fuse callbacks left the catalog query code |
| 324 |
|
✗ |
fence_->Drain(); |
| 325 |
|
|
catalog::LoadReturn retval; |
| 326 |
|
✗ |
if (root_hash.IsNull()) { |
| 327 |
|
✗ |
retval = mountpoint_->catalog_mgr()->Remount(); |
| 328 |
|
|
} else { |
| 329 |
|
✗ |
retval = mountpoint_->catalog_mgr()->ChangeRoot(root_hash); |
| 330 |
|
|
} |
| 331 |
|
✗ |
if (mountpoint_->inode_annotation()) { |
| 332 |
|
✗ |
inode_generation_info_->inode_generation = mountpoint_->inode_annotation() |
| 333 |
|
✗ |
->GetGeneration(); |
| 334 |
|
|
} |
| 335 |
|
✗ |
mountpoint_->ReEvaluateAuthz(); |
| 336 |
|
✗ |
fence_->Open(); |
| 337 |
|
|
|
| 338 |
|
✗ |
mountpoint_->inode_cache()->Resume(); |
| 339 |
|
✗ |
mountpoint_->path_cache()->Resume(); |
| 340 |
|
✗ |
mountpoint_->md5path_cache()->Resume(); |
| 341 |
|
|
|
| 342 |
|
✗ |
drainout_mode_.fetch_add(-2); // 2 --> 0, end of drainout mode |
| 343 |
|
|
|
| 344 |
|
✗ |
if ((retval == catalog::kLoadFail) || (retval == catalog::kLoadNoSpace)) { |
| 345 |
|
|
// Can temporarily "escape" offline mode if update came from updated |
| 346 |
|
|
// alien cache |
| 347 |
|
✗ |
SetOfflineMode(true); |
| 348 |
|
✗ |
catalogs_valid_until_ = time(NULL) + MountPoint::kShortTermTTL; |
| 349 |
|
✗ |
SetAlarm(MountPoint::kShortTermTTL); |
| 350 |
|
|
} else { |
| 351 |
|
✗ |
SetOfflineMode(false); |
| 352 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogSyslog, "switched to catalog revision %" PRIu64, |
| 353 |
|
✗ |
mountpoint_->catalog_mgr()->GetRevision()); |
| 354 |
|
✗ |
catalogs_valid_until_ = time(NULL) + mountpoint_->GetEffectiveTtlSec(); |
| 355 |
|
✗ |
SetAlarm(mountpoint_->GetEffectiveTtlSec()); |
| 356 |
|
|
} |
| 357 |
|
|
|
| 358 |
|
✗ |
LeaveCriticalSection(); |
| 359 |
|
|
} |
| 360 |
|
|
|