Message ID | 20191217020140.2197-1-li.kai4@h3c.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | [v3] ocfs2: call journal flush to mark journal as empty after journal recovery when mount | expand |
On 19/12/17 10:01, Kai Li wrote: > If journal is dirty when mount, it will be replayed but jbd2 sb > log tail cannot be updated to mark a new start because > journal->j_flag has already been set with JBD2_ABORT first > in journal_init_common. When a new transaction is committed, it > will be recored in block 1 first(journal->j_tail is set to 1 in > journal_reset).If emergency restart happens again before journal > super block is updated unfortunately, the new recorded trans will > not be replayed in the next mount. > > The following steps describe this procedure in detail. > 1. mount and touch some files > 2. these transactions are committed to journal area but not checkpointed > 3. emergency restart > 4. mount again and its journals are replayed > 5. journal super block's first s_start is 1, but its s_seq is not updated > 6. touch a new file and its trans is committed but not checkpointed > 7. emergency restart again > 8. mount and journal is dirty, but trans committed in 6 will not be > replayed. > > This exception happens easily when this lun is used by only one node. If it > is used by multi-nodes, other node will replay its journal and its > journal super block will be updated after recovery like what this patch > does. > > ocfs2_recover_node->ocfs2_replay_journal. > > The following jbd2 journal can be generated by touching a new file after > journal is replayed, and seq 15 is the first valid commit, but first seq > is 13 in journal super block. > logdump: > Block 0: Journal Superblock > Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) > Blocksize: 4096 Total Blocks: 32768 First Block: 1 > First Commit ID: 13 Start Log Blknum: 1 > Error: 0 > Feature Compat: 0 > Feature Incompat: 2 block64 > Feature RO compat: 0 > Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 > FS Share Cnt: 1 Dynamic Superblk Blknum: 0 > Per Txn Block Limit Journal: 0 Data: 0 > > Block 1: Journal Commit Block > Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) > > Block 2: Journal Descriptor > Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) > No. Blocknum Flags > 0. 587 none > UUID: 00000000000000000000000000000000 > 1. 8257792 JBD2_FLAG_SAME_UUID > 2. 619 JBD2_FLAG_SAME_UUID > 3. 24772864 JBD2_FLAG_SAME_UUID > 4. 8257802 JBD2_FLAG_SAME_UUID > 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG > ... > Block 7: Inode > Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) > FS Generation: 2839773110 (0xa9437fb6) > CRC32: 00000000 ECC: 0000 > Type: Regular Attr: 0x0 Flags: Valid > Dynamic Features: (0x1) InlineData > User: 0 (root) Group: 0 (root) Size: 7 > Links: 1 Clusters: 0 > ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 > mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > dtime: 0x0 -- Thu Jan 1 08:00:00 1970 > ... > Block 9: Journal Commit Block > Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) > > The following is jouranl recovery log when recovering the upper jbd2 > journal when mount again. > syslog: > [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. > [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 > [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 > [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 > [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 > > Due to first commit seq 13 recorded in journal super is not consistent > with the value recorded in block 1(seq is 14), journal recovery will be > terminated before seq 15 even though it is an unbroken commit, inode > 8257802 is a new file and it will be lost. > > Signed-off-by: Kai Li <li.kai4@h3c.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> > --- > fs/ocfs2/journal.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c > index 1afe57f425a0..68ba354cf361 100644 > --- a/fs/ocfs2/journal.c > +++ b/fs/ocfs2/journal.c > @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) > > ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); > > + if (replayed) { > + jbd2_journal_lock_updates(journal->j_journal); > + status = jbd2_journal_flush(journal->j_journal); > + jbd2_journal_unlock_updates(journal->j_journal); > + if (status < 0) > + mlog_errno(status); > + } > + > status = ocfs2_journal_toggle_dirty(osb, 1, replayed); > if (status < 0) { > mlog_errno(status); >
Reviewed-by: Changwei Ge <gechangwei@live.cn> On 12/17/19 10:01 AM, Kai Li wrote: > If journal is dirty when mount, it will be replayed but jbd2 sb > log tail cannot be updated to mark a new start because > journal->j_flag has already been set with JBD2_ABORT first > in journal_init_common. When a new transaction is committed, it > will be recored in block 1 first(journal->j_tail is set to 1 in > journal_reset).If emergency restart happens again before journal > super block is updated unfortunately, the new recorded trans will > not be replayed in the next mount. > > The following steps describe this procedure in detail. > 1. mount and touch some files > 2. these transactions are committed to journal area but not checkpointed > 3. emergency restart > 4. mount again and its journals are replayed > 5. journal super block's first s_start is 1, but its s_seq is not updated > 6. touch a new file and its trans is committed but not checkpointed > 7. emergency restart again > 8. mount and journal is dirty, but trans committed in 6 will not be > replayed. > > This exception happens easily when this lun is used by only one node. If it > is used by multi-nodes, other node will replay its journal and its > journal super block will be updated after recovery like what this patch > does. > > ocfs2_recover_node->ocfs2_replay_journal. > > The following jbd2 journal can be generated by touching a new file after > journal is replayed, and seq 15 is the first valid commit, but first seq > is 13 in journal super block. > logdump: > Block 0: Journal Superblock > Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) > Blocksize: 4096 Total Blocks: 32768 First Block: 1 > First Commit ID: 13 Start Log Blknum: 1 > Error: 0 > Feature Compat: 0 > Feature Incompat: 2 block64 > Feature RO compat: 0 > Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 > FS Share Cnt: 1 Dynamic Superblk Blknum: 0 > Per Txn Block Limit Journal: 0 Data: 0 > > Block 1: Journal Commit Block > Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) > > Block 2: Journal Descriptor > Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) > No. Blocknum Flags > 0. 587 none > UUID: 00000000000000000000000000000000 > 1. 8257792 JBD2_FLAG_SAME_UUID > 2. 619 JBD2_FLAG_SAME_UUID > 3. 24772864 JBD2_FLAG_SAME_UUID > 4. 8257802 JBD2_FLAG_SAME_UUID > 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG > ... > Block 7: Inode > Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) > FS Generation: 2839773110 (0xa9437fb6) > CRC32: 00000000 ECC: 0000 > Type: Regular Attr: 0x0 Flags: Valid > Dynamic Features: (0x1) InlineData > User: 0 (root) Group: 0 (root) Size: 7 > Links: 1 Clusters: 0 > ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 > mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > dtime: 0x0 -- Thu Jan 1 08:00:00 1970 > ... > Block 9: Journal Commit Block > Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) > > The following is jouranl recovery log when recovering the upper jbd2 > journal when mount again. > syslog: > [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. > [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 > [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 > [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 > [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 > > Due to first commit seq 13 recorded in journal super is not consistent > with the value recorded in block 1(seq is 14), journal recovery will be > terminated before seq 15 even though it is an unbroken commit, inode > 8257802 is a new file and it will be lost. > > Signed-off-by: Kai Li <li.kai4@h3c.com> > --- > fs/ocfs2/journal.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c > index 1afe57f425a0..68ba354cf361 100644 > --- a/fs/ocfs2/journal.c > +++ b/fs/ocfs2/journal.c > @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) > > ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); > > + if (replayed) { > + jbd2_journal_lock_updates(journal->j_journal); > + status = jbd2_journal_flush(journal->j_journal); > + jbd2_journal_unlock_updates(journal->j_journal); > + if (status < 0) > + mlog_errno(status); > + } > + > status = ocfs2_journal_toggle_dirty(osb, 1, replayed); > if (status < 0) { > mlog_errno(status); >
On Tue, 17 Dec 2019 10:12:14 +0800 Joseph Qi <jiangqi903@gmail.com> wrote: > > Due to first commit seq 13 recorded in journal super is not consistent > > with the value recorded in block 1(seq is 14), journal recovery will be > > terminated before seq 15 even though it is an unbroken commit, inode > > 8257802 is a new file and it will be lost. > > > > Signed-off-by: Kai Li <li.kai4@h3c.com> > > Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Do we think this fix should be backported into -stable kernels?
On 19/12/18 10:23, Andrew Morton wrote: > On Tue, 17 Dec 2019 10:12:14 +0800 Joseph Qi <jiangqi903@gmail.com> wrote: > >>> Due to first commit seq 13 recorded in journal super is not consistent >>> with the value recorded in block 1(seq is 14), journal recovery will be >>> terminated before seq 15 even though it is an unbroken commit, inode >>> 8257802 is a new file and it will be lost. >>> >>> Signed-off-by: Kai Li <li.kai4@h3c.com> >> >> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> > > Do we think this fix should be backported into -stable kernels? > Since this is not an usual usecase, we don't have to. It is enough to let it go into upstream. Thanks, Joseph
On 2019/12/17 10:01, Kai Li wrote: > If journal is dirty when mount, it will be replayed but jbd2 sb > log tail cannot be updated to mark a new start because > journal->j_flag has already been set with JBD2_ABORT first > in journal_init_common. When a new transaction is committed, it > will be recored in block 1 first(journal->j_tail is set to 1 in > journal_reset).If emergency restart happens again before journal > super block is updated unfortunately, the new recorded trans will > not be replayed in the next mount. > > The following steps describe this procedure in detail. > 1. mount and touch some files > 2. these transactions are committed to journal area but not checkpointed > 3. emergency restart > 4. mount again and its journals are replayed > 5. journal super block's first s_start is 1, but its s_seq is not updated > 6. touch a new file and its trans is committed but not checkpointed > 7. emergency restart again > 8. mount and journal is dirty, but trans committed in 6 will not be > replayed. > > This exception happens easily when this lun is used by only one node. If it > is used by multi-nodes, other node will replay its journal and its > journal super block will be updated after recovery like what this patch > does. > > ocfs2_recover_node->ocfs2_replay_journal. > > The following jbd2 journal can be generated by touching a new file after > journal is replayed, and seq 15 is the first valid commit, but first seq > is 13 in journal super block. > logdump: > Block 0: Journal Superblock > Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) > Blocksize: 4096 Total Blocks: 32768 First Block: 1 > First Commit ID: 13 Start Log Blknum: 1 > Error: 0 > Feature Compat: 0 > Feature Incompat: 2 block64 > Feature RO compat: 0 > Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 > FS Share Cnt: 1 Dynamic Superblk Blknum: 0 > Per Txn Block Limit Journal: 0 Data: 0 > > Block 1: Journal Commit Block > Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) > > Block 2: Journal Descriptor > Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) > No. Blocknum Flags > 0. 587 none > UUID: 00000000000000000000000000000000 > 1. 8257792 JBD2_FLAG_SAME_UUID > 2. 619 JBD2_FLAG_SAME_UUID > 3. 24772864 JBD2_FLAG_SAME_UUID > 4. 8257802 JBD2_FLAG_SAME_UUID > 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG > ... > Block 7: Inode > Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) > FS Generation: 2839773110 (0xa9437fb6) > CRC32: 00000000 ECC: 0000 > Type: Regular Attr: 0x0 Flags: Valid > Dynamic Features: (0x1) InlineData > User: 0 (root) Group: 0 (root) Size: 7 > Links: 1 Clusters: 0 > ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 > mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 > dtime: 0x0 -- Thu Jan 1 08:00:00 1970 > ... > Block 9: Journal Commit Block > Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) > > The following is jouranl recovery log when recovering the upper jbd2 > journal when mount again. > syslog: > [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. > [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 > [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 > [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 > [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 > > Due to first commit seq 13 recorded in journal super is not consistent > with the value recorded in block 1(seq is 14), journal recovery will be > terminated before seq 15 even though it is an unbroken commit, inode > 8257802 is a new file and it will be lost. > > Signed-off-by: Kai Li <li.kai4@h3c.com> > --- > fs/ocfs2/journal.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c > index 1afe57f425a0..68ba354cf361 100644 > --- a/fs/ocfs2/journal.c > +++ b/fs/ocfs2/journal.c > @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) > > ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); > > + if (replayed) { > + jbd2_journal_lock_updates(journal->j_journal); > + status = jbd2_journal_flush(journal->j_journal); What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' won't be reset, and I wonder if the problem still remains. Thanks, Jun > + jbd2_journal_unlock_updates(journal->j_journal); > + if (status < 0) > + mlog_errno(status); > + } > + > status = ocfs2_journal_toggle_dirty(osb, 1, replayed); > if (status < 0) { > mlog_errno(status); >
On 19/12/19 22:15, piaojun wrote: > > > On 2019/12/17 10:01, Kai Li wrote: >> If journal is dirty when mount, it will be replayed but jbd2 sb >> log tail cannot be updated to mark a new start because >> journal->j_flag has already been set with JBD2_ABORT first >> in journal_init_common. When a new transaction is committed, it >> will be recored in block 1 first(journal->j_tail is set to 1 in >> journal_reset).If emergency restart happens again before journal >> super block is updated unfortunately, the new recorded trans will >> not be replayed in the next mount. >> >> The following steps describe this procedure in detail. >> 1. mount and touch some files >> 2. these transactions are committed to journal area but not checkpointed >> 3. emergency restart >> 4. mount again and its journals are replayed >> 5. journal super block's first s_start is 1, but its s_seq is not updated >> 6. touch a new file and its trans is committed but not checkpointed >> 7. emergency restart again >> 8. mount and journal is dirty, but trans committed in 6 will not be >> replayed. >> >> This exception happens easily when this lun is used by only one node. If it >> is used by multi-nodes, other node will replay its journal and its >> journal super block will be updated after recovery like what this patch >> does. >> >> ocfs2_recover_node->ocfs2_replay_journal. >> >> The following jbd2 journal can be generated by touching a new file after >> journal is replayed, and seq 15 is the first valid commit, but first seq >> is 13 in journal super block. >> logdump: >> Block 0: Journal Superblock >> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >> First Commit ID: 13 Start Log Blknum: 1 >> Error: 0 >> Feature Compat: 0 >> Feature Incompat: 2 block64 >> Feature RO compat: 0 >> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >> Per Txn Block Limit Journal: 0 Data: 0 >> >> Block 1: Journal Commit Block >> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >> >> Block 2: Journal Descriptor >> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >> No. Blocknum Flags >> 0. 587 none >> UUID: 00000000000000000000000000000000 >> 1. 8257792 JBD2_FLAG_SAME_UUID >> 2. 619 JBD2_FLAG_SAME_UUID >> 3. 24772864 JBD2_FLAG_SAME_UUID >> 4. 8257802 JBD2_FLAG_SAME_UUID >> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >> ... >> Block 7: Inode >> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >> FS Generation: 2839773110 (0xa9437fb6) >> CRC32: 00000000 ECC: 0000 >> Type: Regular Attr: 0x0 Flags: Valid >> Dynamic Features: (0x1) InlineData >> User: 0 (root) Group: 0 (root) Size: 7 >> Links: 1 Clusters: 0 >> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >> ... >> Block 9: Journal Commit Block >> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >> >> The following is jouranl recovery log when recovering the upper jbd2 >> journal when mount again. >> syslog: >> [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. >> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 >> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 >> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 >> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 >> >> Due to first commit seq 13 recorded in journal super is not consistent >> with the value recorded in block 1(seq is 14), journal recovery will be >> terminated before seq 15 even though it is an unbroken commit, inode >> 8257802 is a new file and it will be lost. >> >> Signed-off-by: Kai Li <li.kai4@h3c.com> >> --- >> fs/ocfs2/journal.c | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >> index 1afe57f425a0..68ba354cf361 100644 >> --- a/fs/ocfs2/journal.c >> +++ b/fs/ocfs2/journal.c >> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) >> >> ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); >> >> + if (replayed) { >> + jbd2_journal_lock_updates(journal->j_journal); >> + status = jbd2_journal_flush(journal->j_journal); > > What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' > won't be reset, and I wonder if the problem still remains. > Yes, but we don't want this to fail the mount process, instead we just log an error and system administrator should know the result. Thanks, Joseph
On 2019/12/20 9:11, Joseph Qi wrote: > > > On 19/12/19 22:15, piaojun wrote: >> >> >> On 2019/12/17 10:01, Kai Li wrote: >>> If journal is dirty when mount, it will be replayed but jbd2 sb >>> log tail cannot be updated to mark a new start because >>> journal->j_flag has already been set with JBD2_ABORT first >>> in journal_init_common. When a new transaction is committed, it >>> will be recored in block 1 first(journal->j_tail is set to 1 in >>> journal_reset).If emergency restart happens again before journal >>> super block is updated unfortunately, the new recorded trans will >>> not be replayed in the next mount. >>> >>> The following steps describe this procedure in detail. >>> 1. mount and touch some files >>> 2. these transactions are committed to journal area but not checkpointed >>> 3. emergency restart >>> 4. mount again and its journals are replayed >>> 5. journal super block's first s_start is 1, but its s_seq is not updated >>> 6. touch a new file and its trans is committed but not checkpointed >>> 7. emergency restart again >>> 8. mount and journal is dirty, but trans committed in 6 will not be >>> replayed. >>> >>> This exception happens easily when this lun is used by only one node. If it >>> is used by multi-nodes, other node will replay its journal and its >>> journal super block will be updated after recovery like what this patch >>> does. >>> >>> ocfs2_recover_node->ocfs2_replay_journal. >>> >>> The following jbd2 journal can be generated by touching a new file after >>> journal is replayed, and seq 15 is the first valid commit, but first seq >>> is 13 in journal super block. >>> logdump: >>> Block 0: Journal Superblock >>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>> First Commit ID: 13 Start Log Blknum: 1 >>> Error: 0 >>> Feature Compat: 0 >>> Feature Incompat: 2 block64 >>> Feature RO compat: 0 >>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>> Per Txn Block Limit Journal: 0 Data: 0 >>> >>> Block 1: Journal Commit Block >>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>> >>> Block 2: Journal Descriptor >>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>> No. Blocknum Flags >>> 0. 587 none >>> UUID: 00000000000000000000000000000000 >>> 1. 8257792 JBD2_FLAG_SAME_UUID >>> 2. 619 JBD2_FLAG_SAME_UUID >>> 3. 24772864 JBD2_FLAG_SAME_UUID >>> 4. 8257802 JBD2_FLAG_SAME_UUID >>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>> ... >>> Block 7: Inode >>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>> FS Generation: 2839773110 (0xa9437fb6) >>> CRC32: 00000000 ECC: 0000 >>> Type: Regular Attr: 0x0 Flags: Valid >>> Dynamic Features: (0x1) InlineData >>> User: 0 (root) Group: 0 (root) Size: 7 >>> Links: 1 Clusters: 0 >>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>> ... >>> Block 9: Journal Commit Block >>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>> >>> The following is jouranl recovery log when recovering the upper jbd2 >>> journal when mount again. >>> syslog: >>> [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. >>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 >>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 >>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 >>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>> >>> Due to first commit seq 13 recorded in journal super is not consistent >>> with the value recorded in block 1(seq is 14), journal recovery will be >>> terminated before seq 15 even though it is an unbroken commit, inode >>> 8257802 is a new file and it will be lost. >>> >>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>> --- >>> fs/ocfs2/journal.c | 8 ++++++++ >>> 1 file changed, 8 insertions(+) >>> >>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>> index 1afe57f425a0..68ba354cf361 100644 >>> --- a/fs/ocfs2/journal.c >>> +++ b/fs/ocfs2/journal.c >>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) >>> >>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); >>> >>> + if (replayed) { >>> + jbd2_journal_lock_updates(journal->j_journal); >>> + status = jbd2_journal_flush(journal->j_journal); >> >> What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' >> won't be reset, and I wonder if the problem still remains. >> > > Yes, but we don't want this to fail the mount process, instead we just log > an error and system administrator should know the result. > Thanks for your reply and I have another question about this issue. IMO the second trans is not complete as jbd2 sb has not been updated, so we do not need to replay it when mount again. Jun
On 2019/12/20 17:14, piaojun wrote: > > On 2019/12/20 9:11, Joseph Qi wrote: >> >> On 19/12/19 22:15, piaojun wrote: >>> >>> On 2019/12/17 10:01, Kai Li wrote: >>>> If journal is dirty when mount, it will be replayed but jbd2 sb >>>> log tail cannot be updated to mark a new start because >>>> journal->j_flag has already been set with JBD2_ABORT first >>>> in journal_init_common. When a new transaction is committed, it >>>> will be recored in block 1 first(journal->j_tail is set to 1 in >>>> journal_reset).If emergency restart happens again before journal >>>> super block is updated unfortunately, the new recorded trans will >>>> not be replayed in the next mount. >>>> >>>> The following steps describe this procedure in detail. >>>> 1. mount and touch some files >>>> 2. these transactions are committed to journal area but not checkpointed >>>> 3. emergency restart >>>> 4. mount again and its journals are replayed >>>> 5. journal super block's first s_start is 1, but its s_seq is not updated >>>> 6. touch a new file and its trans is committed but not checkpointed >>>> 7. emergency restart again >>>> 8. mount and journal is dirty, but trans committed in 6 will not be >>>> replayed. >>>> >>>> This exception happens easily when this lun is used by only one node. If it >>>> is used by multi-nodes, other node will replay its journal and its >>>> journal super block will be updated after recovery like what this patch >>>> does. >>>> >>>> ocfs2_recover_node->ocfs2_replay_journal. >>>> >>>> The following jbd2 journal can be generated by touching a new file after >>>> journal is replayed, and seq 15 is the first valid commit, but first seq >>>> is 13 in journal super block. >>>> logdump: >>>> Block 0: Journal Superblock >>>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>>> First Commit ID: 13 Start Log Blknum: 1 >>>> Error: 0 >>>> Feature Compat: 0 >>>> Feature Incompat: 2 block64 >>>> Feature RO compat: 0 >>>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>>> Per Txn Block Limit Journal: 0 Data: 0 >>>> >>>> Block 1: Journal Commit Block >>>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>>> >>>> Block 2: Journal Descriptor >>>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>>> No. Blocknum Flags >>>> 0. 587 none >>>> UUID: 00000000000000000000000000000000 >>>> 1. 8257792 JBD2_FLAG_SAME_UUID >>>> 2. 619 JBD2_FLAG_SAME_UUID >>>> 3. 24772864 JBD2_FLAG_SAME_UUID >>>> 4. 8257802 JBD2_FLAG_SAME_UUID >>>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>>> ... >>>> Block 7: Inode >>>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>>> FS Generation: 2839773110 (0xa9437fb6) >>>> CRC32: 00000000 ECC: 0000 >>>> Type: Regular Attr: 0x0 Flags: Valid >>>> Dynamic Features: (0x1) InlineData >>>> User: 0 (root) Group: 0 (root) Size: 7 >>>> Links: 1 Clusters: 0 >>>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>>> ... >>>> Block 9: Journal Commit Block >>>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>>> >>>> The following is jouranl recovery log when recovering the upper jbd2 >>>> journal when mount again. >>>> syslog: >>>> [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. >>>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 >>>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 >>>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 >>>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>>> >>>> Due to first commit seq 13 recorded in journal super is not consistent >>>> with the value recorded in block 1(seq is 14), journal recovery will be >>>> terminated before seq 15 even though it is an unbroken commit, inode >>>> 8257802 is a new file and it will be lost. >>>> >>>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>>> --- >>>> fs/ocfs2/journal.c | 8 ++++++++ >>>> 1 file changed, 8 insertions(+) >>>> >>>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>>> index 1afe57f425a0..68ba354cf361 100644 >>>> --- a/fs/ocfs2/journal.c >>>> +++ b/fs/ocfs2/journal.c >>>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) >>>> >>>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); >>>> >>>> + if (replayed) { >>>> + jbd2_journal_lock_updates(journal->j_journal); >>>> + status = jbd2_journal_flush(journal->j_journal); >>> What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' >>> won't be reset, and I wonder if the problem still remains. >>> >> Yes, but we don't want this to fail the mount process, instead we just log >> an error and system administrator should know the result. >> > Thanks for your reply and I have another question about this issue. IMO > the second trans is not complete as jbd2 sb has not been updated, so we > do not need to replay it when mount again. > > Jun > > I don't think so. The problem is that jbd2 sb should be updated to mark a new start after mount rather than whether trans committed later is complete or not. In fact , the trans is complete too as the commit log described. Thanks
On 2019/12/20 17:33, Likai wrote: > On 2019/12/20 17:14, piaojun wrote: >> On 2019/12/20 9:11, Joseph Qi wrote: >>> On 19/12/19 22:15, piaojun wrote: >>>> On 2019/12/17 10:01, Kai Li wrote: >>>>> If journal is dirty when mount, it will be replayed but jbd2 sb >>>>> log tail cannot be updated to mark a new start because >>>>> journal->j_flag has already been set with JBD2_ABORT first >>>>> in journal_init_common. When a new transaction is committed, it >>>>> will be recored in block 1 first(journal->j_tail is set to 1 in >>>>> journal_reset).If emergency restart happens again before journal >>>>> super block is updated unfortunately, the new recorded trans will >>>>> not be replayed in the next mount. >>>>> >>>>> The following steps describe this procedure in detail. >>>>> 1. mount and touch some files >>>>> 2. these transactions are committed to journal area but not checkpointed >>>>> 3. emergency restart >>>>> 4. mount again and its journals are replayed >>>>> 5. journal super block's first s_start is 1, but its s_seq is not updated >>>>> 6. touch a new file and its trans is committed but not checkpointed Hi, I wonder that in this step, does the function jbd2_journal_commit_transaction() return? I understand only jbd2_journal_commit_transaction() return it means the transaction is committed completely, and the s_seq can be updated in jbd2_journal_commit_transaction()->jbd2_update_log_tail(), so I don't know how this scenario happened. If emergency restart happens in before jbd2_journal_commit_transaction() return, I think this transaction shouldn't be a valid transaction. Can you explain where the specific function is executed? Thanks, Yiwen. >>>>> 7. emergency restart again >>>>> 8. mount and journal is dirty, but trans committed in 6 will not be >>>>> replayed. >>>>> >>>>> This exception happens easily when this lun is used by only one node. If it >>>>> is used by multi-nodes, other node will replay its journal and its >>>>> journal super block will be updated after recovery like what this patch >>>>> does. >>>>> >>>>> ocfs2_recover_node->ocfs2_replay_journal. >>>>> >>>>> The following jbd2 journal can be generated by touching a new file after >>>>> journal is replayed, and seq 15 is the first valid commit, but first seq >>>>> is 13 in journal super block. >>>>> logdump: >>>>> Block 0: Journal Superblock >>>>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>>>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>>>> First Commit ID: 13 Start Log Blknum: 1 >>>>> Error: 0 >>>>> Feature Compat: 0 >>>>> Feature Incompat: 2 block64 >>>>> Feature RO compat: 0 >>>>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>>>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>>>> Per Txn Block Limit Journal: 0 Data: 0 >>>>> >>>>> Block 1: Journal Commit Block >>>>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>>>> >>>>> Block 2: Journal Descriptor >>>>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>>>> No. Blocknum Flags >>>>> 0. 587 none >>>>> UUID: 00000000000000000000000000000000 >>>>> 1. 8257792 JBD2_FLAG_SAME_UUID >>>>> 2. 619 JBD2_FLAG_SAME_UUID >>>>> 3. 24772864 JBD2_FLAG_SAME_UUID >>>>> 4. 8257802 JBD2_FLAG_SAME_UUID >>>>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>>>> ... >>>>> Block 7: Inode >>>>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>>>> FS Generation: 2839773110 (0xa9437fb6) >>>>> CRC32: 00000000 ECC: 0000 >>>>> Type: Regular Attr: 0x0 Flags: Valid >>>>> Dynamic Features: (0x1) InlineData >>>>> User: 0 (root) Group: 0 (root) Size: 7 >>>>> Links: 1 Clusters: 0 >>>>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>>>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>>>> ... >>>>> Block 9: Journal Commit Block >>>>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>>>> >>>>> The following is jouranl recovery log when recovering the upper jbd2 >>>>> journal when mount again. >>>>> syslog: >>>>> [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. >>>>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 >>>>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 >>>>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 >>>>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>>>> >>>>> Due to first commit seq 13 recorded in journal super is not consistent >>>>> with the value recorded in block 1(seq is 14), journal recovery will be >>>>> terminated before seq 15 even though it is an unbroken commit, inode >>>>> 8257802 is a new file and it will be lost. >>>>> >>>>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>>>> --- >>>>> fs/ocfs2/journal.c | 8 ++++++++ >>>>> 1 file changed, 8 insertions(+) >>>>> >>>>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>>>> index 1afe57f425a0..68ba354cf361 100644 >>>>> --- a/fs/ocfs2/journal.c >>>>> +++ b/fs/ocfs2/journal.c >>>>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) >>>>> >>>>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); >>>>> >>>>> + if (replayed) { >>>>> + jbd2_journal_lock_updates(journal->j_journal); >>>>> + status = jbd2_journal_flush(journal->j_journal); >>>> What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' >>>> won't be reset, and I wonder if the problem still remains. >>>> >>> Yes, but we don't want this to fail the mount process, instead we just log >>> an error and system administrator should know the result. >>> >> Thanks for your reply and I have another question about this issue. IMO >> the second trans is not complete as jbd2 sb has not been updated, so we >> do not need to replay it when mount again. >> >> Jun >> >> > I don't think so. The problem is that jbd2 sb should be updated to mark > a new start after mount rather than whether trans committed later is > complete or not. > > In fact , the trans is complete too as the commit log described. > > Thanks > > > _______________________________________________ > Ocfs2-devel mailing list > Ocfs2-devel@oss.oracle.com > https://oss.oracle.com/mailman/listinfo/ocfs2-devel > > . >
On 12/20/19 8:52 PM, Jiangyiwen wrote: > On 2019/12/20 17:33, Likai wrote: >> On 2019/12/20 17:14, piaojun wrote: >>> On 2019/12/20 9:11, Joseph Qi wrote: >>>> On 19/12/19 22:15, piaojun wrote: >>>>> On 2019/12/17 10:01, Kai Li wrote: >>>>>> If journal is dirty when mount, it will be replayed but jbd2 sb >>>>>> log tail cannot be updated to mark a new start because >>>>>> journal->j_flag has already been set with JBD2_ABORT first >>>>>> in journal_init_common. When a new transaction is committed, it >>>>>> will be recored in block 1 first(journal->j_tail is set to 1 in >>>>>> journal_reset).If emergency restart happens again before journal >>>>>> super block is updated unfortunately, the new recorded trans will >>>>>> not be replayed in the next mount. >>>>>> >>>>>> The following steps describe this procedure in detail. >>>>>> 1. mount and touch some files >>>>>> 2. these transactions are committed to journal area but not >>>>>> checkpointed >>>>>> 3. emergency restart >>>>>> 4. mount again and its journals are replayed >>>>>> 5. journal super block's first s_start is 1, but its s_seq is not >>>>>> updated >>>>>> 6. touch a new file and its trans is committed but not checkpointed > > Hi, > > I wonder that in this step, does the function > jbd2_journal_commit_transaction() return? > I understand only jbd2_journal_commit_transaction() return it means the > transaction > is committed completely, and the s_seq can be updated in > jbd2_journal_commit_transaction()->jbd2_update_log_tail(), so I don't > know how > this scenario happened. > > If emergency restart happens in before jbd2_journal_commit_transaction() The trick is that jbd2 kernel thread even doesn't have a chance to to update tail. Assuming that a timepoint sits between *mount completion* and the *first iteration* of committing work that jbd2 thread. -Changwei > return, > I think this transaction shouldn't be a valid transaction. > > Can you explain where the specific function is executed? > > Thanks, > Yiwen. > >>>>>> 7. emergency restart again >>>>>> 8. mount and journal is dirty, but trans committed in 6 will not be >>>>>> replayed. >>>>>> >>>>>> This exception happens easily when this lun is used by only one >>>>>> node. If it >>>>>> is used by multi-nodes, other node will replay its journal and its >>>>>> journal super block will be updated after recovery like what this >>>>>> patch >>>>>> does. >>>>>> >>>>>> ocfs2_recover_node->ocfs2_replay_journal. >>>>>> >>>>>> The following jbd2 journal can be generated by touching a new file >>>>>> after >>>>>> journal is replayed, and seq 15 is the first valid commit, but >>>>>> first seq >>>>>> is 13 in journal super block. >>>>>> logdump: >>>>>> Block 0: Journal Superblock >>>>>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>>>>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>>>>> First Commit ID: 13 Start Log Blknum: 1 >>>>>> Error: 0 >>>>>> Feature Compat: 0 >>>>>> Feature Incompat: 2 block64 >>>>>> Feature RO compat: 0 >>>>>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>>>>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>>>>> Per Txn Block Limit Journal: 0 Data: 0 >>>>>> >>>>>> Block 1: Journal Commit Block >>>>>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>> >>>>>> Block 2: Journal Descriptor >>>>>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>>>>> No. Blocknum Flags >>>>>> 0. 587 none >>>>>> UUID: 00000000000000000000000000000000 >>>>>> 1. 8257792 JBD2_FLAG_SAME_UUID >>>>>> 2. 619 JBD2_FLAG_SAME_UUID >>>>>> 3. 24772864 JBD2_FLAG_SAME_UUID >>>>>> 4. 8257802 JBD2_FLAG_SAME_UUID >>>>>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>>>>> ... >>>>>> Block 7: Inode >>>>>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>>>>> FS Generation: 2839773110 (0xa9437fb6) >>>>>> CRC32: 00000000 ECC: 0000 >>>>>> Type: Regular Attr: 0x0 Flags: Valid >>>>>> Dynamic Features: (0x1) InlineData >>>>>> User: 0 (root) Group: 0 (root) Size: 7 >>>>>> Links: 1 Clusters: 0 >>>>>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>>>>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>>>>> ... >>>>>> Block 9: Journal Commit Block >>>>>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>> >>>>>> The following is jouranl recovery log when recovering the upper jbd2 >>>>>> journal when mount again. >>>>>> syslog: >>>>>> [ 2265.648622] ocfs2: File system on device (252,1) was not >>>>>> unmounted cleanly, recovering it. >>>>>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>> recovery pass 0 >>>>>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>> recovery pass 1 >>>>>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>> recovery pass 2 >>>>>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): >>>>>> JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>>>>> >>>>>> Due to first commit seq 13 recorded in journal super is not >>>>>> consistent >>>>>> with the value recorded in block 1(seq is 14), journal recovery >>>>>> will be >>>>>> terminated before seq 15 even though it is an unbroken commit, inode >>>>>> 8257802 is a new file and it will be lost. >>>>>> >>>>>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>>>>> --- >>>>>> fs/ocfs2/journal.c | 8 ++++++++ >>>>>> 1 file changed, 8 insertions(+) >>>>>> >>>>>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>>>>> index 1afe57f425a0..68ba354cf361 100644 >>>>>> --- a/fs/ocfs2/journal.c >>>>>> +++ b/fs/ocfs2/journal.c >>>>>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal >>>>>> *journal, int local, int replayed) >>>>>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, >>>>>> osb->slot_num); >>>>>> + if (replayed) { >>>>>> + jbd2_journal_lock_updates(journal->j_journal); >>>>>> + status = jbd2_journal_flush(journal->j_journal); >>>>> What if jbd2_journal_flush gets failed? The 's_sequence' and 's_start' >>>>> won't be reset, and I wonder if the problem still remains. >>>>> >>>> Yes, but we don't want this to fail the mount process, instead we >>>> just log >>>> an error and system administrator should know the result. >>>> >>> Thanks for your reply and I have another question about this issue. IMO >>> the second trans is not complete as jbd2 sb has not been updated, so we >>> do not need to replay it when mount again. >>> >>> Jun >>> >>> >> I don't think so. The problem is that jbd2 sb should be updated to mark >> a new start after mount rather than whether trans committed later is >> complete or not. >> >> In fact , the trans is complete too as the commit log described. >> >> Thanks >> >> >> _______________________________________________ >> Ocfs2-devel mailing list >> Ocfs2-devel@oss.oracle.com >> https://oss.oracle.com/mailman/listinfo/ocfs2-devel >> >> . >> >
On 2019/12/21 15:24, Changwei Ge wrote: > > > On 12/20/19 8:52 PM, Jiangyiwen wrote: >> On 2019/12/20 17:33, Likai wrote: >>> On 2019/12/20 17:14, piaojun wrote: >>>> On 2019/12/20 9:11, Joseph Qi wrote: >>>>> On 19/12/19 22:15, piaojun wrote: >>>>>> On 2019/12/17 10:01, Kai Li wrote: >>>>>>> If journal is dirty when mount, it will be replayed but jbd2 sb >>>>>>> log tail cannot be updated to mark a new start because >>>>>>> journal->j_flag has already been set with JBD2_ABORT first >>>>>>> in journal_init_common. When a new transaction is committed, it >>>>>>> will be recored in block 1 first(journal->j_tail is set to 1 in >>>>>>> journal_reset).If emergency restart happens again before journal >>>>>>> super block is updated unfortunately, the new recorded trans will >>>>>>> not be replayed in the next mount. >>>>>>> >>>>>>> The following steps describe this procedure in detail. >>>>>>> 1. mount and touch some files >>>>>>> 2. these transactions are committed to journal area but not >>>>>>> checkpointed >>>>>>> 3. emergency restart >>>>>>> 4. mount again and its journals are replayed >>>>>>> 5. journal super block's first s_start is 1, but its s_seq is >>>>>>> not updated >>>>>>> 6. touch a new file and its trans is committed but not checkpointed >> >> Hi, >> >> I wonder that in this step, does the function >> jbd2_journal_commit_transaction() return? >> I understand only jbd2_journal_commit_transaction() return it means >> the transaction >> is committed completely, and the s_seq can be updated in >> jbd2_journal_commit_transaction()->jbd2_update_log_tail(), so I don't >> know how >> this scenario happened. >> >> If emergency restart happens in before jbd2_journal_commit_transaction() > > The trick is that jbd2 kernel thread even doesn't have a chance to to > update tail. Assuming that a timepoint sits between *mount completion* > and the *first iteration* of committing work that jbd2 thread. > Hi Changwei, So I think if *first iteration* of committing work in jbd2 kernel thread is not completed, and then the transaction should not be considered a valid transaction. In addition, since we use ordered mode in jbd2, filesystem only ensure metadata consistency not data consistency. In above scenario, the filesystem is still normal without any damage. Thanks, Yiwen. > -Changwei > >> return, >> I think this transaction shouldn't be a valid transaction. >> >> Can you explain where the specific function is executed? >> >> Thanks, >> Yiwen. >> >>>>>>> 7. emergency restart again >>>>>>> 8. mount and journal is dirty, but trans committed in 6 will not be >>>>>>> replayed. >>>>>>> >>>>>>> This exception happens easily when this lun is used by only one >>>>>>> node. If it >>>>>>> is used by multi-nodes, other node will replay its journal and its >>>>>>> journal super block will be updated after recovery like what >>>>>>> this patch >>>>>>> does. >>>>>>> >>>>>>> ocfs2_recover_node->ocfs2_replay_journal. >>>>>>> >>>>>>> The following jbd2 journal can be generated by touching a new >>>>>>> file after >>>>>>> journal is replayed, and seq 15 is the first valid commit, but >>>>>>> first seq >>>>>>> is 13 in journal super block. >>>>>>> logdump: >>>>>>> Block 0: Journal Superblock >>>>>>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>>>>>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>>>>>> First Commit ID: 13 Start Log Blknum: 1 >>>>>>> Error: 0 >>>>>>> Feature Compat: 0 >>>>>>> Feature Incompat: 2 block64 >>>>>>> Feature RO compat: 0 >>>>>>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>>>>>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>>>>>> Per Txn Block Limit Journal: 0 Data: 0 >>>>>>> >>>>>>> Block 1: Journal Commit Block >>>>>>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>>> >>>>>>> Block 2: Journal Descriptor >>>>>>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>>>>>> No. Blocknum Flags >>>>>>> 0. 587 none >>>>>>> UUID: 00000000000000000000000000000000 >>>>>>> 1. 8257792 JBD2_FLAG_SAME_UUID >>>>>>> 2. 619 JBD2_FLAG_SAME_UUID >>>>>>> 3. 24772864 JBD2_FLAG_SAME_UUID >>>>>>> 4. 8257802 JBD2_FLAG_SAME_UUID >>>>>>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>>>>>> ... >>>>>>> Block 7: Inode >>>>>>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>>>>>> FS Generation: 2839773110 (0xa9437fb6) >>>>>>> CRC32: 00000000 ECC: 0000 >>>>>>> Type: Regular Attr: 0x0 Flags: Valid >>>>>>> Dynamic Features: (0x1) InlineData >>>>>>> User: 0 (root) Group: 0 (root) Size: 7 >>>>>>> Links: 1 Clusters: 0 >>>>>>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>>>>>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>>>>>> ... >>>>>>> Block 9: Journal Commit Block >>>>>>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>>> >>>>>>> The following is jouranl recovery log when recovering the upper >>>>>>> jbd2 >>>>>>> journal when mount again. >>>>>>> syslog: >>>>>>> [ 2265.648622] ocfs2: File system on device (252,1) was not >>>>>>> unmounted cleanly, recovering it. >>>>>>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>> recovery pass 0 >>>>>>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>> recovery pass 1 >>>>>>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>> recovery pass 2 >>>>>>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): >>>>>>> JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>>>>>> >>>>>>> Due to first commit seq 13 recorded in journal super is not >>>>>>> consistent >>>>>>> with the value recorded in block 1(seq is 14), journal recovery >>>>>>> will be >>>>>>> terminated before seq 15 even though it is an unbroken commit, >>>>>>> inode >>>>>>> 8257802 is a new file and it will be lost. >>>>>>> >>>>>>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>>>>>> --- >>>>>>> fs/ocfs2/journal.c | 8 ++++++++ >>>>>>> 1 file changed, 8 insertions(+) >>>>>>> >>>>>>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>>>>>> index 1afe57f425a0..68ba354cf361 100644 >>>>>>> --- a/fs/ocfs2/journal.c >>>>>>> +++ b/fs/ocfs2/journal.c >>>>>>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct >>>>>>> ocfs2_journal *journal, int local, int replayed) >>>>>>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, >>>>>>> osb->slot_num); >>>>>>> + if (replayed) { >>>>>>> + jbd2_journal_lock_updates(journal->j_journal); >>>>>>> + status = jbd2_journal_flush(journal->j_journal); >>>>>> What if jbd2_journal_flush gets failed? The 's_sequence' and >>>>>> 's_start' >>>>>> won't be reset, and I wonder if the problem still remains. >>>>>> >>>>> Yes, but we don't want this to fail the mount process, instead we >>>>> just log >>>>> an error and system administrator should know the result. >>>>> >>>> Thanks for your reply and I have another question about this issue. >>>> IMO >>>> the second trans is not complete as jbd2 sb has not been updated, >>>> so we >>>> do not need to replay it when mount again. >>>> >>>> Jun >>>> >>>> >>> I don't think so. The problem is that jbd2 sb should be updated to mark >>> a new start after mount rather than whether trans committed later is >>> complete or not. >>> >>> In fact , the trans is complete too as the commit log described. >>> >>> Thanks >>> >>> >>> _______________________________________________ >>> Ocfs2-devel mailing list >>> Ocfs2-devel@oss.oracle.com >>> https://oss.oracle.com/mailman/listinfo/ocfs2-devel >>> >>> . >>> >> > > . >
Hi Yiwen, Sorry for late reply since I was on a vocation last week :-) On 12/23/19 9:54 AM, Jiangyiwen wrote: > > > On 2019/12/21 15:24, Changwei Ge wrote: >> >> >> On 12/20/19 8:52 PM, Jiangyiwen wrote: >>> On 2019/12/20 17:33, Likai wrote: >>>> On 2019/12/20 17:14, piaojun wrote: >>>>> On 2019/12/20 9:11, Joseph Qi wrote: >>>>>> On 19/12/19 22:15, piaojun wrote: >>>>>>> On 2019/12/17 10:01, Kai Li wrote: >>>>>>>> If journal is dirty when mount, it will be replayed but jbd2 sb >>>>>>>> log tail cannot be updated to mark a new start because >>>>>>>> journal->j_flag has already been set with JBD2_ABORT first >>>>>>>> in journal_init_common. When a new transaction is committed, it >>>>>>>> will be recored in block 1 first(journal->j_tail is set to 1 in >>>>>>>> journal_reset).If emergency restart happens again before journal >>>>>>>> super block is updated unfortunately, the new recorded trans will >>>>>>>> not be replayed in the next mount. >>>>>>>> >>>>>>>> The following steps describe this procedure in detail. >>>>>>>> 1. mount and touch some files >>>>>>>> 2. these transactions are committed to journal area but not >>>>>>>> checkpointed >>>>>>>> 3. emergency restart >>>>>>>> 4. mount again and its journals are replayed >>>>>>>> 5. journal super block's first s_start is 1, but its s_seq is >>>>>>>> not updated >>>>>>>> 6. touch a new file and its trans is committed but not checkpointed >>> >>> Hi, >>> >>> I wonder that in this step, does the function >>> jbd2_journal_commit_transaction() return? >>> I understand only jbd2_journal_commit_transaction() return it means >>> the transaction >>> is committed completely, and the s_seq can be updated in >>> jbd2_journal_commit_transaction()->jbd2_update_log_tail(), so I don't >>> know how >>> this scenario happened. >>> >>> If emergency restart happens in before jbd2_journal_commit_transaction() >> >> The trick is that jbd2 kernel thread even doesn't have a chance to to >> update tail. Assuming that a timepoint sits between *mount completion* >> and the *first iteration* of committing work that jbd2 thread. >> > > Hi Changwei, > > So I think if *first iteration* of committing work in jbd2 kernel thread > is not > completed, and then the transaction should not be considered a valid > transaction. Um... Here I think we are talking about *log tail* update. If jbd2 kernel thread already works for more than one iteration, it might have a chance to update log tail during committing trans. But if even no once of work iteration, it definitely can't update that tail to mark the boundary of uncheckpointed transactions. > > In addition, since we use ordered mode in jbd2, filesystem only ensure > metadata consistency not data consistency. In above scenario, the > filesystem > is still normal without any damage. True, the filesystem meta should be consistent. But the transaction is actually committed and valid. Relaying it does no harm. In fact, I think it's a normal/standard use case of jbd2 that call jbd2_journal_flush() after relaying the entire journal. Please refer to ext4 and peer-help recovery progress in ocfs2. Thanks, Changwei > > Thanks, > Yiwen. > >> -Changwei >> >>> return, >>> I think this transaction shouldn't be a valid transaction. >>> >>> Can you explain where the specific function is executed? >>> >>> Thanks, >>> Yiwen. >>> >>>>>>>> 7. emergency restart again >>>>>>>> 8. mount and journal is dirty, but trans committed in 6 will not be >>>>>>>> replayed. >>>>>>>> >>>>>>>> This exception happens easily when this lun is used by only one >>>>>>>> node. If it >>>>>>>> is used by multi-nodes, other node will replay its journal and its >>>>>>>> journal super block will be updated after recovery like what >>>>>>>> this patch >>>>>>>> does. >>>>>>>> >>>>>>>> ocfs2_recover_node->ocfs2_replay_journal. >>>>>>>> >>>>>>>> The following jbd2 journal can be generated by touching a new >>>>>>>> file after >>>>>>>> journal is replayed, and seq 15 is the first valid commit, but >>>>>>>> first seq >>>>>>>> is 13 in journal super block. >>>>>>>> logdump: >>>>>>>> Block 0: Journal Superblock >>>>>>>> Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) >>>>>>>> Blocksize: 4096 Total Blocks: 32768 First Block: 1 >>>>>>>> First Commit ID: 13 Start Log Blknum: 1 >>>>>>>> Error: 0 >>>>>>>> Feature Compat: 0 >>>>>>>> Feature Incompat: 2 block64 >>>>>>>> Feature RO compat: 0 >>>>>>>> Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 >>>>>>>> FS Share Cnt: 1 Dynamic Superblk Blknum: 0 >>>>>>>> Per Txn Block Limit Journal: 0 Data: 0 >>>>>>>> >>>>>>>> Block 1: Journal Commit Block >>>>>>>> Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>>>> >>>>>>>> Block 2: Journal Descriptor >>>>>>>> Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) >>>>>>>> No. Blocknum Flags >>>>>>>> 0. 587 none >>>>>>>> UUID: 00000000000000000000000000000000 >>>>>>>> 1. 8257792 JBD2_FLAG_SAME_UUID >>>>>>>> 2. 619 JBD2_FLAG_SAME_UUID >>>>>>>> 3. 24772864 JBD2_FLAG_SAME_UUID >>>>>>>> 4. 8257802 JBD2_FLAG_SAME_UUID >>>>>>>> 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG >>>>>>>> ... >>>>>>>> Block 7: Inode >>>>>>>> Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) >>>>>>>> FS Generation: 2839773110 (0xa9437fb6) >>>>>>>> CRC32: 00000000 ECC: 0000 >>>>>>>> Type: Regular Attr: 0x0 Flags: Valid >>>>>>>> Dynamic Features: (0x1) InlineData >>>>>>>> User: 0 (root) Group: 0 (root) Size: 7 >>>>>>>> Links: 1 Clusters: 0 >>>>>>>> ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>>>> atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 >>>>>>>> mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 >>>>>>>> dtime: 0x0 -- Thu Jan 1 08:00:00 1970 >>>>>>>> ... >>>>>>>> Block 9: Journal Commit Block >>>>>>>> Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) >>>>>>>> >>>>>>>> The following is jouranl recovery log when recovering the upper >>>>>>>> jbd2 >>>>>>>> journal when mount again. >>>>>>>> syslog: >>>>>>>> [ 2265.648622] ocfs2: File system on device (252,1) was not >>>>>>>> unmounted cleanly, recovering it. >>>>>>>> [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>>> recovery pass 0 >>>>>>>> [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>>> recovery pass 1 >>>>>>>> [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting >>>>>>>> recovery pass 2 >>>>>>>> [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): >>>>>>>> JBD2: recovery, exit status 0, recovered transactions 13 to 13 >>>>>>>> >>>>>>>> Due to first commit seq 13 recorded in journal super is not >>>>>>>> consistent >>>>>>>> with the value recorded in block 1(seq is 14), journal recovery >>>>>>>> will be >>>>>>>> terminated before seq 15 even though it is an unbroken commit, >>>>>>>> inode >>>>>>>> 8257802 is a new file and it will be lost. >>>>>>>> >>>>>>>> Signed-off-by: Kai Li <li.kai4@h3c.com> >>>>>>>> --- >>>>>>>> fs/ocfs2/journal.c | 8 ++++++++ >>>>>>>> 1 file changed, 8 insertions(+) >>>>>>>> >>>>>>>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c >>>>>>>> index 1afe57f425a0..68ba354cf361 100644 >>>>>>>> --- a/fs/ocfs2/journal.c >>>>>>>> +++ b/fs/ocfs2/journal.c >>>>>>>> @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct >>>>>>>> ocfs2_journal *journal, int local, int replayed) >>>>>>>> ocfs2_clear_journal_error(osb->sb, journal->j_journal, >>>>>>>> osb->slot_num); >>>>>>>> + if (replayed) { >>>>>>>> + jbd2_journal_lock_updates(journal->j_journal); >>>>>>>> + status = jbd2_journal_flush(journal->j_journal); >>>>>>> What if jbd2_journal_flush gets failed? The 's_sequence' and >>>>>>> 's_start' >>>>>>> won't be reset, and I wonder if the problem still remains. >>>>>>> >>>>>> Yes, but we don't want this to fail the mount process, instead we >>>>>> just log >>>>>> an error and system administrator should know the result. >>>>>> >>>>> Thanks for your reply and I have another question about this issue. >>>>> IMO >>>>> the second trans is not complete as jbd2 sb has not been updated, >>>>> so we >>>>> do not need to replay it when mount again. >>>>> >>>>> Jun >>>>> >>>>> >>>> I don't think so. The problem is that jbd2 sb should be updated to mark >>>> a new start after mount rather than whether trans committed later is >>>> complete or not. >>>> >>>> In fact , the trans is complete too as the commit log described. >>>> >>>> Thanks >>>> >>>> >>>> _______________________________________________ >>>> Ocfs2-devel mailing list >>>> Ocfs2-devel@oss.oracle.com >>>> https://oss.oracle.com/mailman/listinfo/ocfs2-devel >>>> >>>> . >>>> >>> >> >> . >> >
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c index 1afe57f425a0..68ba354cf361 100644 --- a/fs/ocfs2/journal.c +++ b/fs/ocfs2/journal.c @@ -1066,6 +1066,14 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num); + if (replayed) { + jbd2_journal_lock_updates(journal->j_journal); + status = jbd2_journal_flush(journal->j_journal); + jbd2_journal_unlock_updates(journal->j_journal); + if (status < 0) + mlog_errno(status); + } + status = ocfs2_journal_toggle_dirty(osb, 1, replayed); if (status < 0) { mlog_errno(status);
If journal is dirty when mount, it will be replayed but jbd2 sb log tail cannot be updated to mark a new start because journal->j_flag has already been set with JBD2_ABORT first in journal_init_common. When a new transaction is committed, it will be recored in block 1 first(journal->j_tail is set to 1 in journal_reset).If emergency restart happens again before journal super block is updated unfortunately, the new recorded trans will not be replayed in the next mount. The following steps describe this procedure in detail. 1. mount and touch some files 2. these transactions are committed to journal area but not checkpointed 3. emergency restart 4. mount again and its journals are replayed 5. journal super block's first s_start is 1, but its s_seq is not updated 6. touch a new file and its trans is committed but not checkpointed 7. emergency restart again 8. mount and journal is dirty, but trans committed in 6 will not be replayed. This exception happens easily when this lun is used by only one node. If it is used by multi-nodes, other node will replay its journal and its journal super block will be updated after recovery like what this patch does. ocfs2_recover_node->ocfs2_replay_journal. The following jbd2 journal can be generated by touching a new file after journal is replayed, and seq 15 is the first valid commit, but first seq is 13 in journal super block. logdump: Block 0: Journal Superblock Seq: 0 Type: 4 (JBD2_SUPERBLOCK_V2) Blocksize: 4096 Total Blocks: 32768 First Block: 1 First Commit ID: 13 Start Log Blknum: 1 Error: 0 Feature Compat: 0 Feature Incompat: 2 block64 Feature RO compat: 0 Journal UUID: 4ED3822C54294467A4F8E87D2BA4BC36 FS Share Cnt: 1 Dynamic Superblk Blknum: 0 Per Txn Block Limit Journal: 0 Data: 0 Block 1: Journal Commit Block Seq: 14 Type: 2 (JBD2_COMMIT_BLOCK) Block 2: Journal Descriptor Seq: 15 Type: 1 (JBD2_DESCRIPTOR_BLOCK) No. Blocknum Flags 0. 587 none UUID: 00000000000000000000000000000000 1. 8257792 JBD2_FLAG_SAME_UUID 2. 619 JBD2_FLAG_SAME_UUID 3. 24772864 JBD2_FLAG_SAME_UUID 4. 8257802 JBD2_FLAG_SAME_UUID 5. 513 JBD2_FLAG_SAME_UUID JBD2_FLAG_LAST_TAG ... Block 7: Inode Inode: 8257802 Mode: 0640 Generation: 57157641 (0x3682809) FS Generation: 2839773110 (0xa9437fb6) CRC32: 00000000 ECC: 0000 Type: Regular Attr: 0x0 Flags: Valid Dynamic Features: (0x1) InlineData User: 0 (root) Group: 0 (root) Size: 7 Links: 1 Clusters: 0 ctime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 atime: 0x5de5d870 0x113181a1 -- Tue Dec 3 11:37:20.288457121 2019 mtime: 0x5de5d870 0x11104c61 -- Tue Dec 3 11:37:20.286280801 2019 dtime: 0x0 -- Thu Jan 1 08:00:00 1970 ... Block 9: Journal Commit Block Seq: 15 Type: 2 (JBD2_COMMIT_BLOCK) The following is jouranl recovery log when recovering the upper jbd2 journal when mount again. syslog: [ 2265.648622] ocfs2: File system on device (252,1) was not unmounted cleanly, recovering it. [ 2265.649695] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 0 [ 2265.650407] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 1 [ 2265.650409] fs/jbd2/recovery.c:(do_one_pass, 449): Starting recovery pass 2 [ 2265.650410] fs/jbd2/recovery.c:(jbd2_journal_recover, 278): JBD2: recovery, exit status 0, recovered transactions 13 to 13 Due to first commit seq 13 recorded in journal super is not consistent with the value recorded in block 1(seq is 14), journal recovery will be terminated before seq 15 even though it is an unbroken commit, inode 8257802 is a new file and it will be lost. Signed-off-by: Kai Li <li.kai4@h3c.com> --- fs/ocfs2/journal.c | 8 ++++++++ 1 file changed, 8 insertions(+)