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2012-04-23jbd2: use GFP_NOFS for blkdev_issue_flushShaohua Li
flush request is issued in transaction commit code path, so looks using GFP_KERNEL to allocate memory for flush request bio falls into the classic deadlock issue. I saw btrfs and dm get it right, but ext4, xfs and md are using GFP. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Cc: stable@vger.kernel.org
2012-03-28Merge tag 'split-asm_system_h-for-linus-20120328' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
2012-03-28Remove all #inclusions of asm/system.hDavid Howells
Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *` Signed-off-by: David Howells <dhowells@redhat.com>
2012-03-28Merge tag 'ext4_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 updates for 3.4 from Ted Ts'o: "Ext4 commits for 3.3 merge window; mostly cleanups and bug fixes The changes to export dirty_writeback_interval are from Artem's s_dirt cleanup patch series. The same is true of the change to remove the s_dirt helper functions which never got used by anyone in-tree. I've run these changes by Al Viro, and am carrying them so that Artem can more easily fix up the rest of the file systems during the next merge window. (Originally we had hopped to remove the use of s_dirt from ext4 during this merge window, but his patches had some bugs, so I ultimately ended dropping them from the ext4 tree.)" * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (66 commits) vfs: remove unused superblock helpers mm: export dirty_writeback_interval ext4: remove useless s_dirt assignment ext4: write superblock only once on unmount ext4: do not mark superblock as dirty unnecessarily ext4: correct ext4_punch_hole return codes ext4: remove restrictive checks for EOFBLOCKS_FL ext4: always set then trimmed blocks count into len ext4: fix trimmed block count accunting ext4: fix start and len arguments handling in ext4_trim_fs() ext4: update s_free_{inodes,blocks}_count during online resize ext4: change some printk() calls to use ext4_msg() instead ext4: avoid output message interleaving in ext4_error_<foo>() ext4: remove trailing newlines from ext4_msg() and ext4_error() messages ext4: add no_printk argument validation, fix fallout ext4: remove redundant "EXT4-fs: " from uses of ext4_msg ext4: give more helpful error message in ext4_ext_rm_leaf() ext4: remove unused code from ext4_ext_map_blocks() ext4: rewrite punch hole to use ext4_ext_remove_space() jbd2: cleanup journal tail after transaction commit ...
2012-03-21Merge tag 'pm-for-3.4' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates for 3.4 from Rafael Wysocki: "Assorted extensions and fixes including: * Introduction of early/late suspend/hibernation device callbacks. * Generic PM domains extensions and fixes. * devfreq updates from Axel Lin and MyungJoo Ham. * Device PM QoS updates. * Fixes of concurrency problems with wakeup sources. * System suspend and hibernation fixes." * tag 'pm-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (43 commits) PM / Domains: Check domain status during hibernation restore of devices PM / devfreq: add relation of recommended frequency. PM / shmobile: Make MTU2 driver use pm_genpd_dev_always_on() PM / shmobile: Make CMT driver use pm_genpd_dev_always_on() PM / shmobile: Make TMU driver use pm_genpd_dev_always_on() PM / Domains: Introduce "always on" device flag PM / Domains: Fix hibernation restore of devices, v2 PM / Domains: Fix handling of wakeup devices during system resume sh_mmcif / PM: Use PM QoS latency constraint tmio_mmc / PM: Use PM QoS latency constraint PM / QoS: Make it possible to expose PM QoS latency constraints PM / Sleep: JBD and JBD2 missing set_freezable() PM / Domains: Fix include for PM_GENERIC_DOMAINS=n case PM / Freezer: Remove references to TIF_FREEZE in comments PM / Sleep: Add more wakeup source initialization routines PM / Hibernate: Enable usermodehelpers in hibernate() error path PM / Sleep: Make __pm_stay_awake() delete wakeup source timers PM / Sleep: Fix race conditions related to wakeup source timer function PM / Sleep: Fix possible infinite loop during wakeup source destruction PM / Hibernate: print physical addresses consistently with other parts of kernel ...
2012-03-20jbd2: remove the second argument of k[un]map_atomic()Cong Wang
Signed-off-by: Cong Wang <amwang@redhat.com>
2012-03-13jbd2: cleanup journal tail after transaction commitJan Kara
Normally, we have to issue a cache flush before we can update journal tail in journal superblock, effectively wiping out old transactions from the journal. So use the fact that during transaction commit we issue cache flush anyway and opportunistically push journal tail as far as we can. Since update of journal superblock is still costly (we have to use WRITE_FUA), we update log tail only if we can free significant amount of space. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: remove bh_state lock from checkpointing codeJan Kara
All accesses to checkpointing entries in journal_head are protected by j_list_lock. Thus __jbd2_journal_remove_checkpoint() doesn't really need bh_state lock. Also the only part of journal head that the rest of checkpointing code needs to check is jh->b_transaction which is safe to read under j_list_lock. So we can safely remove bh_state lock from all of checkpointing code which makes it considerably prettier. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: remove always true condition in __journal_try_to_free_buffer()Jan Kara
The check b_jlist == BJ_None in __journal_try_to_free_buffer() is always true (__jbd2_journal_temp_unlink_buffer() also checks this in an assertion) so just remove it. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: declare __jbd2_journal_temp_unlink_buffer() staticJan Kara
Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: fix BH_JWrite setting in checkpointing codeJan Kara
BH_JWrite bit should be set when buffer is written to the journal. So checkpointing shouldn't set this bit when writing out buffer. This didn't cause any observable bug since BH_JWrite bit is used only for debugging purposes but it's good to have this consistent. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: issue cache flush after checkpointing even with internal journalJan Kara
When we reach jbd2_cleanup_journal_tail(), there is no guarantee that checkpointed buffers are on a stable storage - especially if buffers were written out by jbd2_log_do_checkpoint(), they are likely to be only in disk's caches. Thus when we update journal superblock effectively removing old transaction from journal, this write of superblock can get to stable storage before those checkpointed buffers which can result in filesystem corruption after a crash. Thus we must unconditionally issue a cache flush before we update journal superblock in these cases. A similar problem can also occur if journal superblock is written only in disk's caches, other transaction starts reusing space of the transaction cleaned from the log and power failure happens. Subsequent journal replay would still try to replay the old transaction but some of it's blocks may be already overwritten by the new transaction. For this reason we must use WRITE_FUA when updating log tail and we must first write new log tail to disk and update in-memory information only after that. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13PM / Sleep: JBD and JBD2 missing set_freezable()Nigel Cunningham
With the latest and greatest changes to the freezer, I started seeing panics that were caused by jbd2 running post-process freezing and hitting the canary BUG_ON for non-TuxOnIce I/O submission. I've traced this back to a lack of set_freezable calls in both jbd and jbd2. Since they're clearly meant to be frozen (there are tests for freezing()), I submit the following patch to add the missing calls. Signed-off-by: Nigel Cunningham <nigel@tuxonice.net> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-03-13jbd2: protect all log tail updates with j_checkpoint_mutexJan Kara
There are some log tail updates that are not protected by j_checkpoint_mutex. Some of these are harmless because they happen during startup or shutdown but updates in jbd2_journal_commit_transaction() and jbd2_journal_flush() can really race with other log tail updates (e.g. someone doing jbd2_journal_flush() with someone running jbd2_cleanup_journal_tail()). So protect all log tail updates with j_checkpoint_mutex. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-03-13jbd2: split updating of journal superblock and marking journal emptyJan Kara
There are three case of updating journal superblock. In the first case, we want to mark journal as empty (setting s_sequence to 0), in the second case we want to update log tail, in the third case we want to update s_errno. Split these cases into separate functions. It makes the code slightly more straightforward and later patches will make the distinction even more important. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-20ext4: remove the journal=update mount optionEric Sandeen
The V2 journal format was introduced around ten years ago, for ext3. It seems highly unlikely that anyone will need this migration option for ext4. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-20jbd2: use KMEM_CACHE instead of kmem_cache_create()Yongqiang Yang
Use the KMEM_CACHE helper macro instead of kmem_cache_create(). Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-20jbd2: rename functions which initialize slab cachesYongqiang Yang
This patch renames functions initializing the slab caches for the journal head and handle structures to so they are consistent with the names of the corresponding functions which destroys those slab caches. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-20jbd2: allocate transaction from separate slab cacheYongqiang Yang
There is normally only a handful of these active at any one time, but putting them in a separate slab cache makes debugging memory corruption problems easier. Manish Katiyar also wanted this make it easier to test memory failure scenarios in the jbd2 layer. Cc: Manish Katiyar <mkatiyar@gmail.com> Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-20jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_bufferEric Sandeen
journal_unmap_buffer()'s zap_buffer: code clears a lot of buffer head state ala discard_buffer(), but does not touch _Delay or _Unwritten as discard_buffer() does. This can be problematic in some areas of the ext4 code which assume that if they have found a buffer marked unwritten or delay, then it's a live one. Perhaps those spots should check whether it is mapped as well, but if jbd2 is going to tear down a buffer, let's really tear it down completely. Without this I get some fsx failures on sub-page-block filesystems up until v3.2, at which point 4e96b2dbbf1d7e81f22047a50f862555a6cb87cb and 189e868fa8fdca702eb9db9d8afc46b5cb9144c9 make the failures go away, because buried within that large change is some more flag clearing. I still think it's worth doing in jbd2, since ->invalidatepage leads here directly, and it's the right place to clear away these flags. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
2012-02-20jbd2: add drop_transaction/update_superblock_end tracepointsSeiji Aguchi
This patch adds trace_jbd2_drop_transaction and trace_jbd2_update_superblock_end because there are similar tracepoints in jbd and they are needed in jbd2 as well. Reviewed-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-01-10Merge branch 'for_linus' into for_linus_mergedTheodore Ts'o
Conflicts: fs/ext4/ioctl.c
2012-01-08Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (53 commits) Kconfig: acpi: Fix typo in comment. misc latin1 to utf8 conversions devres: Fix a typo in devm_kfree comment btrfs: free-space-cache.c: remove extra semicolon. fat: Spelling s/obsolate/obsolete/g SCSI, pmcraid: Fix spelling error in a pmcraid_err() call tools/power turbostat: update fields in manpage mac80211: drop spelling fix types.h: fix comment spelling for 'architectures' typo fixes: aera -> area, exntension -> extension devices.txt: Fix typo of 'VMware'. sis900: Fix enum typo 'sis900_rx_bufer_status' decompress_bunzip2: remove invalid vi modeline treewide: Fix comment and string typo 'bufer' hyper-v: Update MAINTAINERS treewide: Fix typos in various parts of the kernel, and fix some comments. clockevents: drop unknown Kconfig symbol GENERIC_CLOCKEVENTS_MIGR gpio: Kconfig: drop unknown symbol 'CS5535_GPIO' leds: Kconfig: Fix typo 'D2NET_V2' sound: Kconfig: drop unknown symbol ARCH_CLPS7500 ... Fix up trivial conflicts in arch/powerpc/platforms/40x/Kconfig (some new kconfig additions, close to removed commented-out old ones)
2012-01-04jbd2: fix hung processes in jbd2_journal_lock_updates()Jan Kara
Toshiyuki Okajima found out that when running for ((i=0; i < 100000; i++)); do if ((i%2 == 0)); then chattr +j /mnt/file else chattr -j /mnt/file fi echo "0" >> /mnt/file done process sometimes hangs indefinitely in jbd2_journal_lock_updates(). Toshiyuki identified that the following race happens: jbd2_journal_lock_updates() |jbd2_journal_stop() ---------------------------------------+--------------------------------------- write_lock(&journal->j_state_lock) | . ++journal->j_barrier_count | . spin_lock(&tran->t_handle_lock) | . atomic_read(&tran->t_updates) //not 0 | | atomic_dec_and_test(&tran->t_updates) | // t_updates = 0 | wake_up(&journal->j_wait_updates) prepare_to_wait() | // no process is woken up. spin_unlock(&tran->t_handle_lock) | write_unlock(&journal->j_state_lock) | schedule() // never return | We fix the problem by first calling prepare_to_wait() and only after that checking t_updates in jbd2_journal_lock_updates(). Reported-and-analyzed-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-12-28jbd2: clear revoked flag on buffers before a new transaction startedYongqiang Yang
Currently, we clear revoked flag only when a block is reused. However, this can tigger a false journal error. Consider a situation when a block is used as a meta block and is deleted(revoked) in ordered mode, then the block is allocated as a data block to a file. At this moment, user changes the file's journal mode from ordered to journaled and truncates the file. The block will be considered re-revoked by journal because it has revoked flag still pending from the last transaction and an assertion triggers. We fix the problem by keeping the revoked status more uptodate - we clear revoked flag when switching revoke tables to reflect there is no revoked buffers in current transaction any more. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-12-06treewide: Fix comment and string typo 'bufer'Paul Bolle
Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-11-21freezer: unexport refrigerator() and update try_to_freeze() slightlyTejun Heo
There is no reason to export two functions for entering the refrigerator. Calling refrigerator() instead of try_to_freeze() doesn't save anything noticeable or removes any race condition. * Rename refrigerator() to __refrigerator() and make it return bool indicating whether it scheduled out for freezing. * Update try_to_freeze() to return bool and relay the return value of __refrigerator() if freezing(). * Convert all refrigerator() users to try_to_freeze(). * Update documentation accordingly. * While at it, add might_sleep() to try_to_freeze(). Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Samuel Ortiz <samuel@sortiz.org> Cc: Chris Mason <chris.mason@oracle.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jan Kara <jack@suse.cz> Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp> Cc: Christoph Hellwig <hch@infradead.org>
2011-11-01jbd2: Unify log messages in jbd2 codeEryu Guan
Some jbd2 code prints out kernel messages with "JBD2: " prefix, at the same time other jbd2 code prints with "JBD: " prefix. Unify the prefix to "JBD2: ". Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-11-01jbd/jbd2: validate sb->s_first in journal_get_superblock()Eryu Guan
I hit a J_ASSERT(blocknr != 0) failure in cleanup_journal_tail() when mounting a fsfuzzed ext3 image. It turns out that the corrupted ext3 image has s_first = 0 in journal superblock, and the 0 is passed to journal->j_head in journal_reset(), then to blocknr in cleanup_journal_tail(), in the end the J_ASSERT failed. So validate s_first after reading journal superblock from disk in journal_get_superblock() to ensure s_first is valid. The following script could reproduce it: fstype=ext3 blocksize=1024 img=$fstype.img offset=0 found=0 magic="c0 3b 39 98" dd if=/dev/zero of=$img bs=1M count=8 mkfs -t $fstype -b $blocksize -F $img filesize=`stat -c %s $img` while [ $offset -lt $filesize ] do if od -j $offset -N 4 -t x1 $img | grep -i "$magic";then echo "Found journal: $offset" found=1 break fi offset=`echo "$offset+$blocksize" | bc` done if [ $found -ne 1 ];then echo "Magic \"$magic\" not found" exit 1 fi dd if=/dev/zero of=$img seek=$(($offset+23)) conv=notrunc bs=1 count=1 mkdir -p ./mnt mount -o loop $img ./mnt Cc: Jan Kara <jack@suse.cz> Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-10-27jbd2: fix build when CONFIG_BUG is not enabledRandy Dunlap
Fix build error when CONFIG_BUG is not enabled: fs/jbd2/transaction.c:1175:3: error: implicit declaration of function '__WARN' by changing __WARN() to WARN_ON(), as suggested by Arnaud Lacombe <lacombar@gmail.com>. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Arnaud Lacombe <lacombar@gmail.com>
2011-09-04jbd2: use gfp_t instead of intDan Carpenter
This silences some Sparse warnings: fs/jbd2/transaction.c:135:69: warning: incorrect type in argument 2 (different base types) fs/jbd2/transaction.c:135:69: expected restricted gfp_t [usertype] flags fs/jbd2/transaction.c:135:69: got int [signed] gfp_mask Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-04jbd2: add debugging information to jbd2_journal_dirty_metadata()Theodore Ts'o
Add debugging information in case jbd2_journal_dirty_metadata() is called with a buffer_head which didn't have jbd2_journal_get_write_access() called on it, or if the journal_head has the wrong transaction in it. In addition, return an error code. This won't change anything for ocfs2, which will BUG_ON() the non-zero exit code. For ext4, the caller of this function is ext4_handle_dirty_metadata(), and on seeing a non-zero return code, will call __ext4_journal_stop(), which will print the function and line number of the (buggy) calling function and abort the journal. This will allow us to recover instead of bug halting, which is better from a robustness and reliability point of view. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-10jbd2: remove jbd2_dev_to_name() from jbd2 tracepointsTheodore Ts'o
Using function calls in TP_printk causes perf heartburn, so print the MAJOR/MINOR device numbers instead. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-06-27jbd2: use WRITE_SYNC in journal checkpointTao Ma
In journal checkpoint, we write the buffer and wait for its finish. But in cfq, the async queue has a very low priority, and in our test, if there are too many sync queues and every queue is filled up with requests, the write request will be delayed for quite a long time and all the tasks which are waiting for journal space will end with errors like: INFO: task attr_set:3816 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. attr_set D ffff880028393480 0 3816 1 0x00000000 ffff8802073fbae8 0000000000000086 ffff8802140847c8 ffff8800283934e8 ffff8802073fb9d8 ffffffff8103e456 ffff8802140847b8 ffff8801ed728080 ffff8801db4bc080 ffff8801ed728450 ffff880028393480 0000000000000002 Call Trace: [<ffffffff8103e456>] ? __dequeue_entity+0x33/0x38 [<ffffffff8103caad>] ? need_resched+0x23/0x2d [<ffffffff814006a6>] ? thread_return+0xa2/0xbc [<ffffffffa01f6224>] ? jbd2_journal_dirty_metadata+0x116/0x126 [jbd2] [<ffffffffa01f6224>] ? jbd2_journal_dirty_metadata+0x116/0x126 [jbd2] [<ffffffff81400d31>] __mutex_lock_common+0x14e/0x1a9 [<ffffffffa021dbfb>] ? brelse+0x13/0x15 [ext4] [<ffffffff81400ddb>] __mutex_lock_slowpath+0x19/0x1b [<ffffffff81400b2d>] mutex_lock+0x1b/0x32 [<ffffffffa01f927b>] __jbd2_journal_insert_checkpoint+0xe3/0x20c [jbd2] [<ffffffffa01f547b>] start_this_handle+0x438/0x527 [jbd2] [<ffffffff8106f491>] ? autoremove_wake_function+0x0/0x3e [<ffffffffa01f560b>] jbd2_journal_start+0xa1/0xcc [jbd2] [<ffffffffa02353be>] ext4_journal_start_sb+0x57/0x81 [ext4] [<ffffffffa024a314>] ext4_xattr_set+0x6c/0xe3 [ext4] [<ffffffffa024aaff>] ext4_xattr_user_set+0x42/0x4b [ext4] [<ffffffff81145adb>] generic_setxattr+0x6b/0x76 [<ffffffff81146ac0>] __vfs_setxattr_noperm+0x47/0xc0 [<ffffffff81146bb8>] vfs_setxattr+0x7f/0x9a [<ffffffff81146c88>] setxattr+0xb5/0xe8 [<ffffffff81137467>] ? do_filp_open+0x571/0xa6e [<ffffffff81146d26>] sys_fsetxattr+0x6b/0x91 [<ffffffff81002d32>] system_call_fastpath+0x16/0x1b So this patch tries to use WRITE_SYNC in __flush_batch so that the request will be moved into sync queue and handled by cfq timely. We also use the new plug, sot that all the WRITE_SYNC requests can be given as a whole when we unplug it. Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Jan Kara <jack@suse.cz> Reported-by: Robin Dong <sanbai@taobao.com>
2011-06-13jbd2: Fix oops in jbd2_journal_remove_journal_head()Jan Kara
jbd2_journal_remove_journal_head() can oops when trying to access journal_head returned by bh2jh(). This is caused for example by the following race: TASK1 TASK2 jbd2_journal_commit_transaction() ... processing t_forget list __jbd2_journal_refile_buffer(jh); if (!jh->b_transaction) { jbd_unlock_bh_state(bh); jbd2_journal_try_to_free_buffers() jbd2_journal_grab_journal_head(bh) jbd_lock_bh_state(bh) __journal_try_to_free_buffer() jbd2_journal_put_journal_head(jh) jbd2_journal_remove_journal_head(bh); jbd2_journal_put_journal_head() in TASK2 sees that b_jcount == 0 and buffer is not part of any transaction and thus frees journal_head before TASK1 gets to doing so. Note that even buffer_head can be released by try_to_free_buffers() after jbd2_journal_put_journal_head() which adds even larger opportunity for oops (but I didn't see this happen in reality). Fix the problem by making transactions hold their own journal_head reference (in b_jcount). That way we don't have to remove journal_head explicitely via jbd2_journal_remove_journal_head() and instead just remove journal_head when b_jcount drops to zero. The result of this is that [__]jbd2_journal_refile_buffer(), [__]jbd2_journal_unfile_buffer(), and __jdb2_journal_remove_checkpoint() can free journal_head which needs modification of a few callers. Also we have to be careful because once journal_head is removed, buffer_head might be freed as well. So we have to get our own buffer_head reference where it matters. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-06-12jbd2: Remove obsolete parameters in the comments for some jbd2 functionsTao Ma
credits isn't a parameter for jbd2_journal_get_write_access and jbd2_journal_get_undo_access. So remove the corresponding comments. Acked-by: Jan Kara <jack@suse.cz> Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-26Merge branch 'for_linus' of ↵Linus Torvalds
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: (61 commits) jbd2: Add MAINTAINERS entry jbd2: fix a potential leak of a journal_head on an error path ext4: teach ext4_ext_split to calculate extents efficiently ext4: Convert ext4 to new truncate calling convention ext4: do not normalize block requests from fallocate() ext4: enable "punch hole" functionality ext4: add "punch hole" flag to ext4_map_blocks() ext4: punch out extents ext4: add new function ext4_block_zero_page_range() ext4: add flag to ext4_has_free_blocks ext4: reserve inodes and feature code for 'quota' feature ext4: add support for multiple mount protection ext4: ensure f_bfree returned by ext4_statfs() is non-negative ext4: protect bb_first_free in ext4_trim_all_free() with group lock ext4: only load buddy bitmap in ext4_trim_fs() when it is needed jbd2: Fix comment to match the code in jbd2__journal_start() ext4: fix waiting and sending of a barrier in ext4_sync_file() jbd2: Add function jbd2_trans_will_send_data_barrier() jbd2: fix sending of data flush on journal commit ext4: fix ext4_ext_fiemap_cb() to handle blocks before request range correctly ...
2011-05-25jbd2: fix a potential leak of a journal_head on an error pathDing Dinghua
drop jh->b_jcount in error path Signed-off-by: Ding Dinghua <dingdinghua@nrchpc.ac.cn> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-24jbd2: Fix comment to match the code in jbd2__journal_start()Eryu Guan
jbd2__journal_start() returns an ERR_PTR() value rather than NULL on failure. Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-24jbd2: Add function jbd2_trans_will_send_data_barrier()Jan Kara
Provide a function which returns whether a transaction with given tid will send a flush to the filesystem device. The function will be used by ext4 to detect whether fsync needs to send a separate flush or not. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-24jbd2: fix sending of data flush on journal commitJan Kara
In data=ordered mode, it's theoretically possible (however rare) that an inode is filed to transaction's t_inode_list and a flusher thread writes all the data and inode is reclaimed before the transaction starts to commit. In such a case, we could erroneously omit sending a flush to file system device when it is different from the journal device (because data can still be in disk cache only). Fix the problem by setting a flag in a transaction when some inode is added to it and then send disk flush in the commit code when the flag is set. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-22jbd2: Fix the wrong calculation of t_max_wait in update_t_max_waitTao Ma
t_max_wait is added in commit 8e85fb3f to indicate how long we were waiting for new transaction to start. In commit 6d0bf005, it is moved to another function named update_t_max_wait to avoid a build warning. But the wrong thing is that the original 'ts' is initialized in the start of function start_this_handle and we can calculate t_max_wait in the right way. while with this change, ts is initialized within the function and t_max_wait can never be calculated right. This patch moves the initialization of ts to the original beginning of start_this_handle and pass it to function update_t_max_wait so that it can be calculated right and the build warning is avoided also. Cc: Jan Kara <jack@suse.cz> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Eric Sandeen <sandeen@redhat.com>
2011-05-17jbd/jbd2: remove obsolete summarise_journal_usage.Tao Ma
summarise_journal_usage seems to be obsolete for a long time, so remove it. Cc: Jan Kara <jack@suse.cz> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Jan Kara <jack@suse.cz>
2011-05-08jbd2: only print the debugging information for tid wraparound onceTheodore Ts'o
If we somehow wrap, we don't want to keep printing the warning message over and over again. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-08jbd2: Fix forever sleeping process in do_get_write_access()Jan Kara
In do_get_write_access() we wait on BH_Unshadow bit for buffer to get from shadow state. The waking code in journal_commit_transaction() has a bug because it does not issue a memory barrier after the buffer is moved from the shadow state and before wake_up_bit() is called. Thus a waitqueue check can happen before the buffer is actually moved from the shadow state and waiting process may never be woken. Fix the problem by issuing proper barrier. Reported-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-01jbd2: fix fsync() tid wraparound bugTheodore Ts'o
If an application program does not make any changes to the indirect blocks or extent tree, i_datasync_tid will not get updated. If there are enough commits (i.e., 2**31) such that tid_geq()'s calculations wrap, and there isn't a currently active transaction at the time of the fdatasync() call, this can end up triggering a BUG_ON in fs/jbd2/commit.c: J_ASSERT(journal->j_running_transaction != NULL); It's pretty rare that this can happen, since it requires the use of fdatasync() plus *very* frequent and excessive use of fsync(). But with the right workload, it can. We fix this by replacing the use of tid_geq() with an equality test, since there's only one valid transaction id that we is valid for us to wait until it is commited: namely, the currently running transaction (if it exists). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-04-11Merge branch 'for_linus' of ↵Linus Torvalds
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: ext4: fix data corruption regression by reverting commit 6de9843dab3f ext4: Allow indirect-block file to grow the file size to max file size ext4: allow an active handle to be started when freezing ext4: sync the directory inode in ext4_sync_parent() ext4: init timer earlier to avoid a kernel panic in __save_error_info jbd2: fix potential memory leak on transaction commit ext4: fix a double free in ext4_register_li_request ext4: fix credits computing for indirect mapped files ext4: remove unnecessary [cm]time update of quota file jbd2: move bdget out of critical section
2011-04-05jbd2: fix potential memory leak on transaction commitZhang Huan
There is potential memory leak of journal head in function jbd2_journal_commit_transaction. The problem is that JBD2 will not reclaim the journal head of commit record if error occurs or journal is abotred. I use the following script to reproduce this issue, on a RHEL6 system. I found it very easy to reproduce with async commit enabled. mount /dev/sdb /mnt -o journal_checksum,journal_async_commit touch /mnt/xxx echo offline > /sys/block/sdb/device/state sync umount /mnt rmmod ext4 rmmod jbd2 Removal of the jbd2 module will make slab complaining that "cache `jbd2_journal_head': can't free all objects". Signed-off-by: Zhang Huan <zhhuan@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-04-04jbd2: move bdget out of critical sectionZhu Yanhai
bdget() should not be called when we hold spinlocks since it might sleep. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Zhu Yanhai <gaoyang.zyh@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-31Fix common misspellingsLucas De Marchi
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>