- Aug 20, 2020
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Shijie Luo authored
Remove the unnecessary chksum_err and checksum_seen variables as well as some redundant code to make the function easier to understand. [ With changes suggested by jack@ and tytso@ ] Signed-off-by:
Shijie Luo <luoshijie1@huawei.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Reviewed-by:
Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20200819122955.33526-1-luoshijie1@huawei.com Signed-off-by:
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- Aug 19, 2020
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Shijie Luo authored
Change to use fallthrough macro in switch case. Signed-off-by:
Ritesh Harjani <riteshh@linux.ibm.com> Link: https://lore.kernel.org/r/20200810114435.24182-1-luoshijie1@huawei.com Signed-off-by:
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Kyoungho Koo authored
The ext4_generic_delete_entry function does not use the parameter handle, so it can be removed. Signed-off-by:
Kyoungho Koo <rnrudgh@gmail.com> Reviewed-by:
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Xu Wang authored
seq_puts is a lot cheaper than seq_printf, so use that to print literal strings. Signed-off-by:
Xu Wang <vulab@iscas.ac.cn> Reviewed-by:
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brookxu authored
It might be better to adjust the code in two places: 1. Determine whether grp is currupt or not should be placed first. 2. (cr<=2 && free <ac->ac_g_ex.fe_len)should may belong to the crx strategy, and it may be more appropriate to put it in the subsequent switch statement block. For cr1, cr2, the conditions in switch potentially realize the above judgment. For cr0, we should add (free <ac->ac_g_ex.fe_len) judgment, and then delete (free / fragments) >= ac->ac_g_ex.fe_len), because cr0 returns true by default. Signed-off-by:
Chunguang Xu <brookxu@tencent.com> Reviewed-by:
Andreas Dilger <adilger@dilger.ca> Reviewed-by:
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brookxu authored
These comments do not seem to be related to ext4_mb_check_limits(), it may be invalid. Signed-off-by:
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brookxu authored
Fix typos in ext4_mb_regular_allocator() comment Signed-off-by:
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- Aug 08, 2020
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Jan Kara authored
ext4_search_dir() and ext4_generic_delete_entry() can be called both for standard director blocks and for inline directories stored inside inode or inline xattr space. For the second case we didn't call ext4_check_dir_entry() with proper constraints that could result in accepting corrupted directory entry as well as false positive filesystem errors like: EXT4-fs error (device dm-0): ext4_search_dir:1395: inode #28320400: block 113246792: comm dockerd: bad entry in directory: directory entry too close to block end - offset=0, inode=28320403, rec_len=32, name_len=8, size=4096 Fix the arguments passed to ext4_check_dir_entry(). Fixes: 109ba779 ("ext4: check for directory entries too close to block end") CC: stable@vger.kernel.org Signed-off-by:
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Xianting Tian authored
If a device is hot-removed --- for example, when a physical device is unplugged from pcie slot or a nbd device's network is shutdown --- this can result in a BUG_ON() crash in submit_bh_wbc(). This is because the when the block device dies, the buffer heads will have their Buffer_Mapped flag get cleared, leading to the crash in submit_bh_wbc. We had attempted to work around this problem in commit a17712c8 ("ext4: check superblock mapped prior to committing"). Unfortunately, it's still possible to hit the BUG_ON(!buffer_mapped(bh)) if the device dies between when the work-around check in ext4_commit_super() and when submit_bh_wbh() is finally called: Code path: ext4_commit_super judge if 'buffer_mapped(sbh)' is false, return <== commit a17712c8 lock_buffer(sbh) ... unlock_buffer(sbh) __sync_dirty_buffer(sbh,... lock_buffer(sbh) judge if 'buffer_mapped(sbh))' is false, return <== added by this patch submit_bh(...,sbh) submit_bh_wbc(...,sbh,...) [100722.966497] kernel BUG at fs/buffer.c:3095! <== BUG_ON(!buffer_mapped(bh))' in submit_bh_wbc() [100722.966503] invalid opcode: 0000 [#1] SMP [100722.966566] task: ffff8817e15a9e40 task.stack: ffffc90024744000 [100722.966574] RIP: 0010:submit_bh_wbc+0x180/0x190 [100722.966575] RSP: 0018:ffffc90024747a90 EFLAGS: 00010246 [100722.966576] RAX: 0000000000620005 RBX: ffff8818a80603a8 RCX: 0000000000000000 [100722.966576] RDX: ffff8818a80603a8 RSI: 0000000000020800 RDI: 0000000000000001 [100722.966577] RBP: ffffc90024747ac0 R08: 0000000000000000 R09: ffff88207f94170d [100722.966578] R10: 00000000000437c8 R11: 0000000000000001 R12: 0000000000020800 [100722.966578] R13: 0000000000000001 R14: 000000000bf9a438 R15: ffff88195f333000 [100722.966580] FS: 00007fa2eee27700(0000) GS:ffff88203d840000(0000) knlGS:0000000000000000 [100722.966580] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [100722.966581] CR2: 0000000000f0b008 CR3: 000000201a622003 CR4: 00000000007606e0 [100722.966582] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [100722.966583] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [100722.966583] PKRU: 55555554 [100722.966583] Call Trace: [100722.966588] __sync_dirty_buffer+0x6e/0xd0 [100722.966614] ext4_commit_super+0x1d8/0x290 [ext4] [100722.966626] __ext4_std_error+0x78/0x100 [ext4] [100722.966635] ? __ext4_journal_get_write_access+0xca/0x120 [ext4] [100722.966646] ext4_reserve_inode_write+0x58/0xb0 [ext4] [100722.966655] ? ext4_dirty_inode+0x48/0x70 [ext4] [100722.966663] ext4_mark_inode_dirty+0x53/0x1e0 [ext4] [100722.966671] ? __ext4_journal_start_sb+0x6d/0xf0 [ext4] [100722.966679] ext4_dirty_inode+0x48/0x70 [ext4] [100722.966682] __mark_inode_dirty+0x17f/0x350 [100722.966686] generic_update_time+0x87/0xd0 [100722.966687] touch_atime+0xa9/0xd0 [100722.966690] generic_file_read_iter+0xa09/0xcd0 [100722.966694] ? page_cache_tree_insert+0xb0/0xb0 [100722.966704] ext4_file_read_iter+0x4a/0x100 [ext4] [100722.966707] ? __inode_security_revalidate+0x4f/0x60 [100722.966709] __vfs_read+0xec/0x160 [100722.966711] vfs_read+0x8c/0x130 [100722.966712] SyS_pread64+0x87/0xb0 [100722.966716] do_syscall_64+0x67/0x1b0 [100722.966719] entry_SYSCALL64_slow_path+0x25/0x25 To address this, add the check of 'buffer_mapped(bh)' to __sync_dirty_buffer(). This also has the benefit of fixing this for other file systems. With this addition, we can drop the workaround in ext4_commit_supper(). [ Commit description rewritten by tytso. ] Signed-off-by:
Xianting Tian <xianting_tian@126.com> Link: https://lore.kernel.org/r/1596211825-8750-1-git-send-email-xianting_tian@126.com Signed-off-by:
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Jan Kara authored
When remounting filesystem fails late during remount handling and block_validity mount option is also changed during the remount, we fail to restore system zone information to a state matching the mount option. This is mostly harmless, just the block validity checking will not match the situation described by the mount option. Make sure these two are always consistent. Reported-by:
Lukas Czerner <lczerner@redhat.com> Reviewed-by:
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Jan Kara authored
There's one place that fails to handle error from add_system_zone() call and thus we can fail to protect superblock and group-descriptor blocks properly in case of ENOMEM. Fix it. Reported-by:
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Jan Kara authored
After the previous patch, ext4_data_block_valid_rcu() has a single caller. Fold it into it. Reviewed-by:
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Jan Kara authored
Currently, system zones just track ranges of block, that are "important" fs metadata (bitmaps, group descriptors, journal blocks, etc.). This however complicates how extent tree (or indirect blocks) can be checked for inodes that actually track such metadata - currently the journal inode but arguably we should be treating quota files or resize inode similarly. We cannot run __ext4_ext_check() on such metadata inodes when loading their extents as that would immediately trigger the validity checks and so we just hack around that and special-case the journal inode. This however leads to a situation that a journal inode which has extent tree of depth at least one can have invalid extent tree that gets unnoticed until ext4_cache_extents() crashes. To overcome this limitation, track inode number each system zone belongs to (0 is used for zones not belonging to any inode). We can then verify inode number matches the expected one when verifying extent tree and thus avoid the false errors. With this there's no need to to special-case journal inode during extent tree checking anymore so remove it. Fixes: 0a944e8a ("ext4: don't perform block validity checks on the journal inode") Reported-by:
Wolfgang Frisch <wolfgang.frisch@suse.com> Reviewed-by:
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Jan Kara authored
Currently, add_system_zone() just silently merges two added system zones that overlap. However the overlap should not happen and it generally suggests that some unrelated metadata overlap which indicates the fs is corrupted. We should have caught such problems earlier (e.g. in ext4_check_descriptors()) but add this check as another line of defense. In later patch we also use this for stricter checking of journal inode extent tree. Reviewed-by:
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Jan Kara authored
ext4_setup_system_zone() can fail. Handle the failure in ext4_remount(). Reviewed-by:
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brookxu authored
Delete the invalid BUGON in ext4_mb_load_buddy_gfp(), the previous code has already judged whether page is NULL. Signed-off-by:
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Dmitry Monakhov authored
This numbers can be analized by system automation similar to errors_count. In ideal world it would be nice to have separate counters for different log-levels, but this makes this patch too intrusive. Signed-off-by:
Dmitry Monakhov <dmtrmonakhov@yandex-team.ru> Link: https://lore.kernel.org/r/20200725123313.4467-1-dmtrmonakhov@yandex-team.ru Signed-off-by:
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Shijie Luo authored
ext4 update feature functions do not exist now, remove these useless function declarations. Signed-off-by:
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Lukas Czerner authored
Currently there is a problem with mount options that can be both set by vfs using mount flags or by a string parsing in ext4. i_version/iversion options gets lost after remount, for example $ mount -o i_version /dev/pmem0 /mnt $ grep pmem0 /proc/self/mountinfo | grep i_version 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,seclabel,i_version $ mount -o remount,ro /mnt $ grep pmem0 /proc/self/mountinfo | grep i_version nolazytime gets ignored by ext4 on remount, for example $ mount -o lazytime /dev/pmem0 /mnt $ grep pmem0 /proc/self/mountinfo | grep lazytime 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,lazytime,seclabel $ mount -o remount,nolazytime /mnt $ grep pmem0 /proc/self/mountinfo | grep lazytime 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,lazytime,seclabel Fix it by applying the SB_LAZYTIME and SB_I_VERSION flags from *flags to s_flags before we parse the option and use the resulting state of the same flags in *flags at the end of successful remount. Signed-off-by:
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Xianting Tian authored
Remove unnecessary blank. Signed-off-by:
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Theodore Ts'o authored
For file systems where we can afford to keep the buddy bitmaps cached, we can speed up initial writes to large file systems by starting to load the block allocation bitmaps as soon as the file system is mounted. This won't work well for _super_ large file systems, or memory constrained systems, so we only enable this when it is requested via a mount option. Addresses-Google-Bug: 159488342 Signed-off-by:
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Theodore Ts'o authored
Modify the ext4_read_block_bitmap_load tracepoint so that it tells us whether a block bitmap is being prefetched. Signed-off-by:
Artem Blagodarenko <artem.blagodarenko@gmail.com>
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zhangyi (F) authored
Parameter gfp_mask in jbd2_journal_try_to_free_buffers() is no longer used after commit <536fc240 > ("jbd2: clean up jbd2_journal_try_to_free_buffers()"), so just remove it. Signed-off-by:
zhangyi (F) <yi.zhang@huawei.com> Link: https://lore.kernel.org/r/20200620025427.1756360-6-yi.zhang@huawei.com Signed-off-by:
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zhangyi (F) authored
If we free a metadata buffer which has been failed to async write out in the background, the jbd2 checkpoint procedure will not detect this failure in jbd2_log_do_checkpoint(), so it may lead to filesystem inconsistency after cleanup journal tail. This patch abort the journal if free a buffer has write_io_error flag to prevent potential further inconsistency. Signed-off-by:
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zhangyi (F) authored
There is a risk of filesystem inconsistency if we failed to async write back metadata buffer in the background. Because of current buffer's end io procedure is handled by end_buffer_async_write() in the block layer, and it only clear the buffer's uptodate flag and mark the write_io_error flag, so ext4 cannot detect such failure immediately. In most cases of getting metadata buffer (e.g. ext4_read_inode_bitmap()), although the buffer's data is actually uptodate, it may still read data from disk because the buffer's uptodate flag has been cleared. Finally, it may lead to on-disk filesystem inconsistency if reading old data from the disk successfully and write them out again. This patch detect bdev mapping->wb_err when getting journal's write access and mark the filesystem error if bdev's mapping->wb_err was increased, this could prevent further writing and potential inconsistency. Signed-off-by:
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- Aug 06, 2020
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Alex Zhuravlev authored
cr=0 is supposed to be an optimization to save CPU cycles, but if buddy data (in memory) is not initialized then all this makes no sense as we have to do sync IO taking a lot of cycles. Also, at cr=0 mballoc doesn't choose any available chunk. cr=1 also skips groups using heuristic based on avg. fragment size. It's more useful to skip such groups and switch to cr=2 where groups will be scanned for available chunks. However, we always read the first block group in a flex_bg so metadata blocks will get read into the first flex_bg if possible. Using sparse image and dm-slow virtual device of 120TB was simulated, then the image was formatted and filled using debugfs to mark ~85% of available space as busy. mount process w/o the patch couldn't complete in half an hour (according to vmstat it would take ~10-11 hours). With the patch applied mount took ~20 seconds. Lustre-bug-id: https://jira.whamcloud.com/browse/LU-12988 Signed-off-by:
Alex Zhuravlev <azhuravlev@whamcloud.com> Reviewed-by:
Andreas Dilger <adilger@whamcloud.com> Reviewed-by:
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Alex Zhuravlev authored
This should significantly improve bitmap loading, especially for flex groups as it tries to load all bitmaps within a flex.group instead of one by one synchronously. Prefetching is done in 8 * flex_bg groups, so it should be 8 read-ahead reads for a single allocating thread. At the end of allocation the thread waits for read-ahead completion and initializes buddy information so that read-aheads are not lost in case of memory pressure. At cr=0 the number of prefetching IOs is limited per allocation context to prevent a situation when mballoc loads thousands of bitmaps looking for a perfect group and ignoring groups with good chunks. Together with the patch "ext4: limit scanning of uninitialized groups" the mount time (which includes few tiny allocations) of a 1PB filesystem is reduced significantly: 0% full 50%-full unpatched patched mount time 33s 9279s 563s [ Restructured by tytso; removed the state flags in the allocation context, so it can be used to lazily prefetch the allocation bitmaps immediately after the file system is mounted. Skip prefetching block groups which are uninitialized. Finally pass in the REQ_RAHEAD flag to the block layer while prefetching. ] Signed-off-by:Alex Zhuravlev <bzzz@whamcloud.com> Reviewed-by:
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Lukas Czerner authored
Ext4 uses blkdev_get_by_dev() to get the block_device for journal device which does check to see if the read-only block device was opened read-only. As a result ext4 will hapily proceed mounting the file system with external journal on read-only device. This is bad as we would not be able to use the journal leading to errors later on. Instead of simply failing to mount file system in this case, treat it in a similar way we treat internal journal on read-only device. Allow to mount with -o noload in read-only mode. This can be reproduced easily like this: mke2fs -F -O journal_dev $JOURNAL_DEV 100M mkfs.$FSTYPE -F -J device=$JOURNAL_DEV $FS_DEV blockdev --setro $JOURNAL_DEV mount $FS_DEV $MNT touch $MNT/file umount $MNT leading to error like this [ 1307.318713] ------------[ cut here ]------------ [ 1307.323362] generic_make_request: Trying to write to read-only block-device dm-2 (partno 0) [ 1307.331741] WARNING: CPU: 36 PID: 3224 at block/blk-core.c:855 generic_make_request_checks+0x2c3/0x580 [ 1307.341041] Modules linked in: ext4 mbcache jbd2 rfkill intel_rapl_msr intel_rapl_common isst_if_commd [ 1307.419445] CPU: 36 PID: 3224 Comm: jbd2/dm-2 Tainted: G W I 5.8.0-rc5 #2 [ 1307.427359] Hardware name: Dell Inc. PowerEdge R740/01KPX8, BIOS 2.3.10 08/15/2019 [ 1307.434932] RIP: 0010:generic_make_request_checks+0x2c3/0x580 [ 1307.440676] Code: 94 03 00 00 48 89 df 48 8d 74 24 08 c6 05 cf 2b 18 01 01 e8 7f a4 ff ff 48 c7 c7 50e [ 1307.459420] RSP: 0018:ffffc0d70eb5fb48 EFLAGS: 00010286 [ 1307.464646] RAX: 0000000000000000 RBX: ffff9b33b2978300 RCX: 0000000000000000 [ 1307.471780] RDX: ffff9b33e12a81e0 RSI: ffff9b33e1298000 RDI: ffff9b33e1298000 [ 1307.478913] RBP: ffff9b7b9679e0c0 R08: 0000000000000837 R09: 0000000000000024 [ 1307.486044] R10: 0000000000000000 R11: ffffc0d70eb5f9f0 R12: 0000000000000400 [ 1307.493177] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 1307.500308] FS: 0000000000000000(0000) GS:ffff9b33e1280000(0000) knlGS:0000000000000000 [ 1307.508396] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1307.514142] CR2: 000055eaf4109000 CR3: 0000003dee40a006 CR4: 00000000007606e0 [ 1307.521273] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1307.528407] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1307.535538] PKRU: 55555554 [ 1307.538250] Call Trace: [ 1307.540708] generic_make_request+0x30/0x340 [ 1307.544985] submit_bio+0x43/0x190 [ 1307.548393] ? bio_add_page+0x62/0x90 [ 1307.552068] submit_bh_wbc+0x16a/0x190 [ 1307.555833] jbd2_write_superblock+0xec/0x200 [jbd2] [ 1307.560803] jbd2_journal_update_sb_log_tail+0x65/0xc0 [jbd2] [ 1307.566557] jbd2_journal_commit_transaction+0x2ae/0x1860 [jbd2] [ 1307.572566] ? check_preempt_curr+0x7a/0x90 [ 1307.576756] ? update_curr+0xe1/0x1d0 [ 1307.580421] ? account_entity_dequeue+0x7b/0xb0 [ 1307.584955] ? newidle_balance+0x231/0x3d0 [ 1307.589056] ? __switch_to_asm+0x42/0x70 [ 1307.592986] ? __switch_to_asm+0x36/0x70 [ 1307.596918] ? lock_timer_base+0x67/0x80 [ 1307.600851] kjournald2+0xbd/0x270 [jbd2] [ 1307.604873] ? finish_wait+0x80/0x80 [ 1307.608460] ? commit_timeout+0x10/0x10 [jbd2] [ 1307.612915] kthread+0x114/0x130 [ 1307.616152] ? kthread_park+0x80/0x80 [ 1307.619816] ret_from_fork+0x22/0x30 [ 1307.623400] ---[ end trace 27490236265b1630 ]--- Signed-off-by:
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brookxu authored
Fix spelling typos in ext4_mb_initialize_context. Signed-off-by:
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Eric Biggers authored
Don't define EXT4_IOC_* aliases to ioctls that already have a generic FS_IOC_* name. These aliases are unnecessary, and they make it unclear which ioctls are ext4-specific and which are generic. Exception: leave EXT4_IOC_GETVERSION_OLD and EXT4_IOC_SETVERSION_OLD as-is for now, since renaming them to FS_IOC_GETVERSION and FS_IOC_SETVERSION would probably make them more likely to be confused with EXT4_IOC_GETVERSION and EXT4_IOC_SETVERSION which also exist. Signed-off-by:
Eric Biggers <ebiggers@google.com> Reviewed-by:
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Eric Biggers authored
Define the EXT4_FL_USER_* constants by OR-ing together the appropriate flags, rather than hard-coding a numeric value. This makes it much easier to see which flags are listed. No change in the actual values. Signed-off-by:
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Jan Kara authored
A customer has reported a BUG_ON in ext4_clear_journal_err() hitting during an LTP testing. Either this has been caused by a test setup issue where the filesystem was being overwritten while LTP was mounting it or the journal replay has overwritten the superblock with invalid data. In either case it is preferable we don't take the machine down with a BUG_ON. So handle the situation of unexpectedly missing has_journal feature more gracefully. We issue warning and fail the mount in the cases where the race window is narrow and the failed check is most likely a programming error. In cases where fs corruption is more likely, we do full ext4_error() handling before failing mount / remount. Reviewed-by:
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Jan Kara authored
Since commit 378f32ba ("ext4: introduce direct I/O write using iomap infrastructure") we don't properly bail out of RWF_NOWAIT direct IO write if underlying blocks are not allocated. Also ext4_dio_write_checks() does not honor RWF_NOWAIT when re-acquiring i_rwsem. Fix both issues. Fixes: 378f32ba ("ext4: introduce direct I/O write using iomap infrastructure") Cc: stable@kernel.org Reported-by:
Filipe Manana <fdmanana@gmail.com> Signed-off-by:
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Alexander A. Klimov authored
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by:Alexander A. Klimov <grandmaster@al2klimov.de> Link: https://lore.kernel.org/r/20200706190339.20709-1-grandmaster@al2klimov.de Signed-off-by:
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Yi Zhuang authored
If dquot_initialize() return non-zero and trace of ext4_unlink_enter/exit enabled then the matching-pair of trace_exit will lost in log. Signed-off-by:
Yi Zhuang <zhuangyi1@huawei.com> Reviewed-by:
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zhengliang authored
It should call trace exit in all return path for ext4_truncate. Signed-off-by:
zhengliang <zhengliang6@huawei.com> Reviewed-by:
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zhangyi (F) authored
jbd2_write_superblock() is under the buffer lock of journal superblock before ending that superblock write, so add a missing unlock_buffer() in in the error path before submitting buffer. Fixes: 742b06b5 ("jbd2: check superblock mapped prior to committing") Signed-off-by:
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Eric Sandeen authored
If for any reason a directory passed to do_split() does not have enough active entries to exceed half the size of the block, we can end up iterating over all "count" entries without finding a split point. In this case, count == move, and split will be zero, and we will attempt a negative index into map[]. Guard against this by detecting this case, and falling back to split-to-half-of-count instead; in this case we will still have plenty of space (> half blocksize) in each split block. Fixes: ef2b02d3 ("ext34: ensure do_split leaves enough free space in both blocks") Signed-off-by:
Eric Sandeen <sandeen@redhat.com> Reviewed-by:
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Lukas Czerner authored
Callers of __jbd2_journal_unfile_buffer() and __jbd2_journal_refile_buffer() assume that the b_transaction is set. In fact if it's not, we can end up with journal_head refcounting errors leading to crash much later that might be very hard to track down. Add asserts to make sure that is the case. We also make sure that b_next_transaction is NULL in __jbd2_journal_unfile_buffer() since the callers expect that as well and we should not get into that stage in this state anyway, leading to problems later on if we do. Tested with fstests. Signed-off-by:
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Dio Putra authored
Fixed a few coding style issues in file.c Signed-off-by:
Dio Putra <dioput12@gmail.com> Link: https://lore.kernel.org/r/239fcd8f-d33f-8621-9e82-0416dd3f9c94@gmail.com Signed-off-by:
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