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* jbd2: replace barriers with explicit flush / FUA usageChristoph Hellwig2010-09-101-39/+4
| | | | | | | | | | Switch to the WRITE_FLUSH_FUA flag for journal commits and remove the EOPNOTSUPP detection for barriers. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* jbd2: Modify ASYNC_COMMIT code to not rely on queue draining on barrierJan Kara2010-09-101-13/+16
| | | | | | | | | | Currently JBD2 relies blkdev_issue_flush() draining the queue when ASYNC_COMMIT feature is set. This property is going away so make JBD2 wait for buffers it needs on its own before submitting the cache flush. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
* kill BH_Ordered flagChristoph Hellwig2010-08-181-24/+15
| | | | | | | | | Instead of abusing a buffer_head flag just add a variant of sync_dirty_buffer which allows passing the exact type of write flag required. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* jbd2: Remove t_handle_lock from start_this_handle()Theodore Ts'o2010-08-031-1/+2
| | | | | | | | This should remove the last exclusive lock from start_this_handle(), so that we should now be able to start multiple transactions at the same time on large SMP systems. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Change j_state_lock to be a rwlock_tTheodore Ts'o2010-08-031-13/+13
| | | | | | | | Lockstat reports have shown that j_state_lock is a major source of lock contention, especially on systems with more than 4 CPU cores. So change it to be a read/write spinlock. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Use atomic variables to avoid taking t_handle_lock in jbd2_journal_stopTheodore Ts'o2010-08-021-6/+7
| | | | | | | | By using an atomic_t for t_updates and t_outstanding credits, this should allow us to not need to take transaction t_handle_lock in jbd2_journal_stop(). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Make barrier messages less scaryEric Sandeen2010-07-271-4/+4
| | | | | | | | | | Saying things like "sync failed" when a device does not support barriers makes users slightly more worried than they need to be; rather than talking about sync failures, let's just state the barrier-based facts. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* blkdev: generalize flags for blkdev_issue_fn functionsDmitry Monakhov2010-04-281-2/+4
| | | | | | | | The patch just convert all blkdev_issue_xxx function to common set of flags. Wait/allocation semantics preserved. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* jbd2: clean up an assertion in jbd2_journal_commit_transaction()dingdinghua2010-02-241-2/+1
| | | | | | | | commit_transaction has the same value as journal->j_running_transaction, so we can simplify the assert statement. Signed-off-by: dingdinghua <dingdinghua@nrchpc.ac.cn> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: delay discarding buffers in journal_unmap_bufferdingdinghua2010-02-151-5/+5
| | | | | | | | | | | Delay discarding buffers in journal_unmap_buffer until we know that "add to orphan" operation has definitely been committed, otherwise the log space of committing transation may be freed and reused before truncate get committed, updates may get lost if crash happens. Signed-off-by: dingdinghua <dingdinghua@nrchpc.ac.cn> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4, jbd2: Add barriers for file systems with exernal journalsTheodore Ts'o2009-12-231-8/+11
| | | | | | | | | | | | | | | | | | | | This is a bit complicated because we are trying to optimize when we send barriers to the fs data disk. We could just throw in an extra barrier to the data disk whenever we send a barrier to the journal disk, but that's not always strictly necessary. We only need to send a barrier during a commit when there are data blocks which are must be written out due to an inode written in ordered mode, or if fsync() depends on the commit to force data blocks to disk. Finally, before we drop transactions from the beginning of the journal during a checkpoint operation, we need to guarantee that any blocks that were flushed out to the data disk are firmly on the rust platter before we drop the transaction from the journal. Thanks to Oleg Drokin for pointing out this flaw in ext3/ext4. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* Merge branch 'for_linus' of ↵Linus Torvalds2009-12-111-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: (21 commits) ext3: PTR_ERR return of wrong pointer in setup_new_group_blocks() ext3: Fix data / filesystem corruption when write fails to copy data ext4: Support for 64-bit quota format ext3: Support for vfsv1 quota format quota: Implement quota format with 64-bit space and inode limits quota: Move definition of QFMT_OCFS2 to linux/quota.h ext2: fix comment in ext2_find_entry about return values ext3: Unify log messages in ext3 ext2: clear uptodate flag on super block I/O error ext2: Unify log messages in ext2 ext3: make "norecovery" an alias for "noload" ext3: Don't update the superblock in ext3_statfs() ext3: journal all modifications in ext3_xattr_set_handle ext2: Explicitly assign values to on-disk enum of filetypes quota: Fix WARN_ON in lookup_one_len const: struct quota_format_ops ubifs: remove manual O_SYNC handling afs: remove manual O_SYNC handling kill wait_on_page_writeback_range vfs: Implement proper O_SYNC semantics ...
| * kill wait_on_page_writeback_rangeChristoph Hellwig2009-12-101-1/+1
| | | | | | | | | | | | | | | | | | All callers really want the more logical filemap_fdatawait_range interface, so convert them to use it and merge wait_on_page_writeback_range into filemap_fdatawait_range. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* | jbd2: Add ENOMEM checking in and for jbd2_journal_write_metadata_buffer()Theodore Ts'o2009-12-011-0/+4
|/ | | | | | OOM happens. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Use tracepoints for history fileTheodore Ts'o2009-09-301-31/+28
| | | | | | | | | The /proc/fs/jbd2/<dev>/history was maintained manually; by using tracepoints, we can get all of the existing functionality of the /proc file plus extra capabilities thanks to the ftrace infrastructure. We save memory as a bonus. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix async commit mode to be safe by using a barrierTheodore Ts'o2009-09-111-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | | Previously the journal_async_commit mount option was equivalent to using barrier=0 (and just as unsafe). This patch fixes it so that we eliminate the barrier before the commit block (by not using ordered mode), and explicitly issuing an empty barrier bio after writing the commit block. Because of the journal checksum, it is safe to do this; if the journal blocks are not all written before a power failure, the checksum in the commit block will prevent the last transaction from being replayed. Using the fs_mark benchmark, using journal_async_commit shows a 50% improvement: FSUse% Count Size Files/sec App Overhead 8 1000 10240 30.5 28242 vs. FSUse% Count Size Files/sec App Overhead 8 1000 10240 45.8 28620 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* writeback: get rid of wbc->for_writepagesJens Axboe2009-09-161-1/+0
| | | | | | | It's only set, it's never checked. Kill it. Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* jbd2: convert instrumentation from markers to tracepointsTheodore Ts'o2009-06-171-6/+7
| | | | Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: use SWRITE_SYNC_PLUG when writing synchronous revoke recordsTheodore Ts'o2009-04-141-1/+2
| | | | | | | | | The revoke records must be written using the same way as the rest of the blocks during the commit process; that is, either marked as synchronous writes or as asynchornous writes. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: use WRITE_SYNC_PLUG instead of WRITE_SYNCJens Axboe2009-04-061-4/+9
| | | | | | | | | | | When you are going to be submitting several sync writes, we want to give the IO scheduler a chance to merge some of them. Instead of using the implicitly unplugging WRITE_SYNC variant, use WRITE_SYNC_PLUG and rely on sync_buffer() doing the unplug when someone does a wait_on_buffer()/lock_buffer(). Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ext4: Use WRITE_SYNC for commits which are caused by fsync()Theodore Ts'o2009-03-251-1/+4
| | | | | | | | If a commit is triggered by fsync(), set a flag indicating the journal blocks associated with the transaction should be flushed out using WRITE_SYNC. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* Merge branch 'for_linus' of ↵Linus Torvalds2009-01-081-9/+49
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (57 commits) jbd2: Fix oops in jbd2_journal_init_inode() on corrupted fs ext4: Remove "extents" mount option block: Add Kconfig help which notes that ext4 needs CONFIG_LBD ext4: Make printk's consistently prefixed with "EXT4-fs: " ext4: Add sanity checks for the superblock before mounting the filesystem ext4: Add mount option to set kjournald's I/O priority jbd2: Submit writes to the journal using WRITE_SYNC jbd2: Add pid and journal device name to the "kjournald2 starting" message ext4: Add markers for better debuggability ext4: Remove code to create the journal inode ext4: provide function to release metadata pages under memory pressure ext3: provide function to release metadata pages under memory pressure add releasepage hooks to block devices which can be used by file systems ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc ext4: Init the complete page while building buddy cache ext4: Don't allow new groups to be added during block allocation ext4: mark the blocks/inode bitmap beyond end of group as used ext4: Use new buffer_head flag to check uninit group bitmaps initialization ext4: Fix the race between read_inode_bitmap() and ext4_new_inode() ext4: code cleanup ...
| * jbd2: Submit writes to the journal using WRITE_SYNCTheodore Ts'o2009-01-041-2/+2
| | | | | | | | | | | | | | | | Since we will be waiting the write of the commit record to the journal to complete in journal_submit_commit_record(), submit it using WRITE_SYNC. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * jbd2: Call journal commit callback without holding j_list_lockAneesh Kumar K.V2008-11-061-5/+8
| | | | | | | | | | | | | | | | | | Avoid freeing the transaction in __jbd2_journal_drop_transaction() so the journal commit callback can run without holding j_list_lock, to avoid lock contention on this spinlock. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * jbd2: improve jbd2 fsync batchingJosef Bacik2008-11-261-0/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes the static sleep time in favor of a more self optimizing approach where we measure the average amount of time it takes to commit a transaction to disk and the ammount of time a transaction has been running. If somebody does a sync write or an fsync() traditionally we would sleep for 1 jiffies, which depending on the value of HZ could be a significant amount of time compared to how long it takes to commit a transaction to the underlying storage. With this patch instead of sleeping for a jiffie, we check to see if the amount of time this transaction has been running is less than the average commit time, and if it is we sleep for the delta using schedule_hrtimeout to give us a higher precision sleep time. This greatly benefits high end storage where you could end up sleeping for longer than it takes to commit the transaction and therefore sitting idle instead of allowing the transaction to be committed by keeping the sleep time to a minimum so you are sure to always be doing something. Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * jbd2: Add barrier not supported test to journal_wait_on_commit_recordTheodore Ts'o2009-01-051-2/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Xen doesn't report that barriers are not supported until buffer I/O is reported as completed, instead of when the buffer I/O is submitted. Add a check and a fallback codepath to journal_wait_on_commit_record() to detect this case, so that attempts to mount ext4 filesystems on LVM/devicemapper devices on Xen guests don't blow up with an "Aborting journal on device XXX"; "Remounting filesystem read-only" error. Thanks to Andreas Sundstrom for reporting this issue. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
* | jbd2: Add buffer triggersJoel Becker2009-01-051-0/+9
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Filesystems often to do compute intensive operation on some metadata. If this operation is repeated many times, it can be very expensive. It would be much nicer if the operation could be performed once before a buffer goes to disk. This adds triggers to jbd2 buffer heads. Just before writing a metadata buffer to the journal, jbd2 will optionally call a commit trigger associated with the buffer. If the journal is aborted, an abort trigger will be called on any dirty buffers as they are dropped from pending transactions. ocfs2 will use this feature. Initially I tried to come up with a more generic trigger that could be used for non-buffer-related events like transaction completion. It doesn't tie nicely, because the information a buffer trigger needs (specific to a journal_head) isn't the same as what a transaction trigger needs (specific to a tranaction_t or perhaps journal_t). So I implemented a buffer set, with the understanding that journal/transaction wide triggers should be implemented separately. There is only one trigger set allowed per buffer. I can't think of any reason to attach more than one set. Contrast this with a journal or transaction in which multiple places may want to watch the entire transaction separately. The trigger sets are considered static allocation from the jbd2 perspective. ocfs2 will just have one trigger set per block type, setting the same set on every bh of the same type. Signed-off-by: Joel Becker <joel.becker@oracle.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* jbd2: Call the commit callback before the transaction could get droppedTheodore Ts'o2008-10-281-4/+4
| | | | | | | | | | | | | | | The transaction can potentially get dropped if there are no buffers that need to be written. Make sure we call the commit callback before potentially deciding to drop the transaction. Also avoid dereferencing the commit_transaction pointer in the marker for the same reason. This patch fixes the bug reported by Eric Paris at: http://bugzilla.kernel.org/show_bug.cgi?id=11838 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Eric Sandeen <sandeen@redhat.com> Tested-by: Eric Paris <eparis@redhat.com>
* ext4: Replace hackish ext4_mb_poll_new_transaction with commit callbackTheodore Ts'o2008-10-161-0/+3
| | | | | | | | | | | The multiblock allocator needs to be able to release blocks (and issue a blkdev discard request) when the transaction which freed those blocks is committed. Previously this was done via a polling mechanism when blocks are allocated or freed. A much better way of doing things is to create a jbd2 callback function and attaching the list of blocks to be freed directly to the transaction structure. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: add an option to control error handling on file dataHidehiro Kawai2008-10-101-0/+2
| | | | | | | | | | | | | | | | | | | | | | | If the journal doesn't abort when it gets an IO error in file data blocks, the file data corruption will spread silently. Because most of applications and commands do buffered writes without fsync(), they don't notice the IO error. It's scary for mission critical systems. On the other hand, if the journal aborts whenever it gets an IO error in file data blocks, the system will easily become inoperable. So this patch introduces a filesystem option to determine whether it aborts the journal or just call printk() when it gets an IO error in file data. If you mount an ext4 fs with data_err=abort option, it aborts on file data write error. If you mount it with data_err=ignore, it doesn't abort, just call printk(). data_err=ignore is the default. Here is the corresponding patch of the ext3 version: http://kerneltrap.org/mailarchive/linux-kernel/2008/9/9/3239374 Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* jbd2: don't dirty original metadata buffer on abortHidehiro Kawai2008-10-101-1/+4
| | | | | | | | | | | | | | | | | | | | | | | Currently, original metadata buffers are dirtied when they are unfiled whether the journal has aborted or not. Eventually these buffers will be written-back to the filesystem by pdflush. This means some metadata buffers are written to the filesystem without journaling if the journal aborts. So if both journal abort and system crash happen at the same time, the filesystem would become inconsistent state. Additionally, replaying journaled metadata can overwrite the latest metadata on the filesystem partly. Because, if the journal gets aborted, journaled metadata are preserved and replayed during the next mount not to lose uncheckpointed metadata. This would also break the consistency of the filesystem. This patch prevents original metadata buffers from being dirtied on abort by clearing BH_JBDDirty flag from those buffers. Thus, no metadata buffers are written to the filesystem without journaling. Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* jbd2: abort when failed to log metadata buffersHidehiro Kawai2008-10-121-0/+3
| | | | | | | | | | | | | | | | | | If we failed to write metadata buffers to the journal space and succeeded to write the commit record, stale data can be written back to the filesystem as metadata in the recovery phase. To avoid this, when we failed to write out metadata buffers, abort the journal before writing the commit record. We can also avoid this kind of corruption by using the journal checksum feature because it can detect invalid metadata blocks in the journal and avoid them from being replayed. So we don't need to care about asynchronous commit record writeout with a checksum. Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* jbd2: Fix buffer head leak when writing the commit blockTheodore Ts'o2008-10-061-3/+2
| | | | | | | | | Also make sure the buffer heads are marked clean before submitting bh for writing. The previous code was marking the buffer head dirty, which would have forced an unneeded write (and seek) to the journal for no good reason. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Add debugging markers that can be used by systemtapTheodore Ts'o2008-10-051-0/+6
| | | | | | | This debugging markers are designed to debug problems such as the random filesystem latency problems reported by Arjan. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: clean up how the journal device name is printedTheodore Ts'o2008-09-161-8/+3
| | | | | | | | | | | | | Calculate the journal device name once and stash it away in the journal_s structure. This avoids needing to call bdevname() everywhere and reduces stack usage by not needing to allocate an on-stack buffer. In addition, we eliminate the '/' that can appear in device names (e.g. "cciss/c0d0p9" --- see kernel bugzilla #11321) that can cause problems when creating proc directory names, and include the inode number to support ocfs2 which creates multiple journals with different inode numbers. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* mm: rename page trylockNick Piggin2008-08-041-1/+1
| | | | | | | | | | | | | | | Converting page lock to new locking bitops requires a change of page flag operation naming, so we might as well convert it to something nicer (!TestSetPageLocked_Lock => trylock_page, SetPageLocked => set_page_locked). This also facilitates lockdeping of page lock. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* jbd2: don't abort if flushing file data failedHidehiro Kawai2008-07-311-4/+20
| | | | | | | | | | | | | | | In ordered mode, the current jbd2 aborts the journal if a file data buffer has an error. But this behavior is unintended, and we found that it has been adopted accidentally. This patch undoes it and just calls printk() instead of aborting the journal. Unlike a similar patch for ext3/jbd, file data buffers are written via generic_writepages(). But we also need to set AS_EIO into their mappings because wait_on_page_writeback_range() clears AS_EIO before a user process sees it. Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Add ordered mode support for delallocAneesh Kumar K.V2008-07-111-5/+33
| | | | | | | | | | | | | | | This provides a new ordered mode implementation which gets rid of using buffer heads to enforce the ordering between metadata change with the related data chage. Instead, in the new ordering mode, it keeps track of all of the inodes touched by each transaction on a list, and when that transaction is committed, it flushes all of the dirty pages for those inodes. In addition, the new ordered mode reverses the lock ordering of the page lock and transaction lock, which provides easier support for delayed allocation. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Remove data=ordered mode support using jbd buffer headsJan Kara2008-07-111-213/+8
| | | | Signed-off-by: Jan Kara <jack@suse.cz>
* jbd2: Implement data=ordered mode handling via inodesJan Kara2008-07-111-0/+90
| | | | | | | | | | | | | | | This patch adds necessary framework into JBD2 to be able to track inodes with each transaction and write-out their dirty data during transaction commit time. This new ordered mode brings all sorts of advantages such as possibility to get rid of journal heads and buffer heads for data buffers in ordered mode, better ordering of writes on transaction commit, simplification of some JBD code, no more anonymous pages when truncate of data being committed happens. Also with this new ordered mode, delayed allocation on ordered mode is much simpler. Signed-off-by: Jan Kara <jack@suse.cz>
* jbd2: Add commit time into the commit blockTheodore Ts'o2008-07-111-0/+3
| | | | | | | | Carlo Wood has demonstrated that it's possible to recover deleted files from the journal. Something that will make this easier is if we can put the time of the commit into commit block. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Fix barrier fallback code to re-lock the buffer headTheodore Ts'o2008-06-031-0/+1
| | | | | | | | If the device doesn't support write barriers, the write is retried without ordered mode. But the buffer head needs to be re-locked or submit_bh will fail with on BUG(!buffer_locked(bh)). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: update transaction t_state to T_COMMIT fixMingming Cao2008-05-151-0/+2
| | | | | | | | | | Updating the current transaction's t_state is protected by j_state_lock. We need to do the same when updating the t_state to T_COMMIT. Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* jbd2: fix possible journal overflow issuesJosef Bacik2008-04-171-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are several cases where the running transaction can get buffers added to its BJ_Metadata list which it never dirtied, which makes its t_nr_buffers counter end up larger than its t_outstanding_credits counter. This will cause issues when starting new transactions as while we are logging buffers we decrement t_outstanding_buffers, so when t_outstanding_buffers goes negative, we will report that we need less space in the journal than we actually need, so transactions will be started even though there may not be enough room for them. In the worst case scenario (which admittedly is almost impossible to reproduce) this will result in the journal running out of space. The fix is to only refile buffers from the committing transaction to the running transactions BJ_Modified list when b_modified is set on that journal, which is the only way to be sure if the running transaction has modified that buffer. This patch also fixes an accounting error in journal_forget, it is possible that we can call journal_forget on a buffer without having modified it, only gotten write access to it, so instead of freeing a credit, we only do so if the buffer was modified. The assert will help catch if this problem occurs. Without these two patches I could hit this assert within minutes of running postmark, with them this issue no longer arises. Cc: <linux-ext4@vger.kernel.org> Cc: Jan Kara <jack@ucw.cz> Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: fix the way the b_modified flag is clearedJosef Bacik2008-04-171-16/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently at the start of a journal commit we loop through all of the buffers on the committing transaction and clear the b_modified flag (the flag that is set when a transaction modifies the buffer) under the j_list_lock. The problem is that everywhere else this flag is modified only under the jbd2 lock buffer flag, so it will race with a running transaction who could potentially set it, and have it unset by the committing transaction. This is also a big waste, you can have several thousands of buffers that you are clearing the modified flag on when you may not need to. This patch removes this code and instead clears the b_modified flag upon entering do_get_write_access/journal_get_create_access, so if that transaction does indeed use the buffer then it will be accounted for properly, and if it does not then we know we didn't use it. That will be important for the next patch in this series. Tested thoroughly by myself using postmark/iozone/bonnie++. Cc: <linux-ext4@vger.kernel.org> Cc: Jan Kara <jack@ucw.cz> Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* JBD2: Clear buffer_ordered flag for barried IO request on successDave Kleikamp2008-02-101-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In JBD2 jbd2_journal_write_commit_record(), clear the buffer_ordered flag for the bh after barried IO has succeed. This prevents later, if the same buffer head were submitted to the underlying device, which has been reconfigured to not support barrier request, the JBD2 commit code could treat it as a normal IO (without barrier). This is a port from JBD/ext3 fix from Neil Brown. More details from Neil: Some devices - notably dm and md - can change their behaviour in response to BIO_RW_BARRIER requests. They might start out accepting such requests but on reconfiguration, they find out that they cannot any more. JBD2 deal with this by always testing if BIO_RW_BARRIER requests fail with EOPNOTSUPP, and retrying the write requests without the barrier (probably after waiting for any pending writes to complete). However there is a bug in the handling this in JBD2 for ext4 . When ext4/JBD2 to submit a BIO_RW_BARRIER request, it sets the buffer_ordered flag on the buffer head. If the request completes successfully, the flag STAYS SET. Other code might then write the same buffer_head after the device has been reconfigured to not accept barriers. This write will then fail, but the "other code" is not ready to handle EOPNOTSUPP errors and the error will be treated as fatal. Cc: Neil Brown <neilb@suse.de> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* JBD2: Use the incompat macro for testing the incompat feature.Aneesh Kumar K.V2008-02-051-1/+1
| | | | | | | | | | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT needs to be checked with JBD2_HAS_INCOMPAT_FEATURE Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Fix reference counting on the journal commit block's buffer headAneesh Kumar K.V2008-02-051-1/+1
| | | | | | | | | | | | | With journal checksum patch we added asynchronous commits of journal commit headers, and accidentally dropped taking a reference on the buffer head. (Before the change, sync_dirty_buffer did the get_bh(). The associative put_bh is done by journal_wait_on_commit_record().) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Add error check to journal_wait_on_commit_record to avoid oopsMingming Cao2008-02-051-1/+2
| | | | | | | | | | | | | | | | | | | The buffer head pointer passed to journal_wait_on_commit_record() could be NULL if the previous journal_submit_commit_record() failed or journal has already aborted. Looking at the jbd2 debug messages, before the oops happened, the jbd2 is aborted due to trying to access the next log block beyond the end of device. This might be caused by using a corrupted image. We need to check the error returns from journal_submit_commit_record() and avoid calling journal_wait_on_commit_record() in the failure case. This addresses Kernel Bugzilla #9849 Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* spinlock: lockbreak cleanupNick Piggin2008-01-301-1/+1
| | | | | | | | | | | | | | | | | | | | The break_lock data structure and code for spinlocks is quite nasty. Not only does it double the size of a spinlock but it changes locking to a potentially less optimal trylock. Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a __raw_spin_is_contended that uses the lock data itself to determine whether there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is not set. Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to decouple it from the spinlock implementation, and make it typesafe (rwlocks do not have any need_lockbreak sites -- why do they even get bloated up with that break_lock then?). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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