1. 02 Feb, 2018 4 commits
  2. 29 Jan, 2018 2 commits
  3. 22 Jan, 2018 34 commits
    • Anand Jain's avatar
      btrfs: set the total_devices in device_list_add() · f2788d2f
      Anand Jain authored
      There is no other parent for device_list_add() except for
      btrfs_scan_one_device(), which would set btrfs_fs_devices::total_devices
      if device_list_add is successful and this can be done with in
      device_list_add() itself.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      f2788d2f
    • Anand Jain's avatar
      btrfs: move pr_info into device_list_add · 327f18cc
      Anand Jain authored
      Commit 60999ca4 ("btrfs: make device scan less noisy")
      adds return value 1 to device_list_add(), so that parent function can
      call pr_info only when new device is added. Move the pr_info() part
      into device_list_add() so that this function can be kept simple.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      327f18cc
    • Anand Jain's avatar
      btrfs: make btrfs_free_stale_devices() to match the path · d8367db3
      Anand Jain authored
      The btrfs_free_stale_devices() is updated to match for the given device
      path and delete it. (It searches for only unmounted list of devices.)
      Also drop the comment about different path being used for the same
      device, since now we will have cli to clean any device that's not a
      concern any more.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      d8367db3
    • Anand Jain's avatar
      btrfs: rename btrfs_free_stale_devices() arg to skip_dev · 0d34097f
      Anand Jain authored
      No functional changes.
      Rename btrfs_free_stale_devices() arg to skip_dev, so that it
      reflects what that arg for.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      0d34097f
    • Anand Jain's avatar
      btrfs: make btrfs_free_stale_devices() argument optional · 522f1b45
      Anand Jain authored
      This updates btrfs_free_stale_devices() helper function to delete all
      unmouted devices, when arg is NULL.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      522f1b45
    • Anand Jain's avatar
      btrfs: make btrfs_free_stale_device() to iterate all stales · 38cf665d
      Anand Jain authored
      Let the list iterator iterate further and find other stale
      devices and delete it. This is in preparation to add support
      for user land request-able stale devices cleanup. Also rename
      btrfs_free_stale_device() to btrfs_free_stale_devices().
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      38cf665d
    • Anand Jain's avatar
      btrfs: no need to check for btrfs_fs_devices::seeding · a848b3e5
      Anand Jain authored
      There is no need to check for btrfs_fs_devices::seeding when we
      have checked for btrfs_fs_devices::opened, because we can't sprout
      without its seed FS being opened.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      a848b3e5
    • Nikolay Borisov's avatar
      btrfs: Use IS_ALIGNED in btrfs_truncate_block instead of opencoding it · b03ebd99
      Nikolay Borisov authored
      No functional changes, just makes the code more readable
      Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
      Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      b03ebd99
    • Liu Bo's avatar
      Btrfs: noinline merge_extent_mapping · 5f4791f4
      Liu Bo authored
      In order to debug subtle bugs around merge_extent_mapping(), perf probe
      can be used to check the arguments, but sometimes merge_extent_mapping()
      got inlined by compiler and couldn't be probed.
      
      This is adding noinline attribute to merge_extent_mapping().
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      5f4791f4
    • Liu Bo's avatar
      Btrfs: add WARN_ONCE to detect unexpected error from merge_extent_mapping · 9a7e10e7
      Liu Bo authored
      This is a subtle case, so in order to understand the problem, it'd be good
      to know the content of existing and em when any error occurs.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      9a7e10e7
    • Liu Bo's avatar
      Btrfs: extent map selftest: dio write vs dio read · cd77f4f8
      Liu Bo authored
      This test case simulates the racy situation of dio write vs dio read,
      and see if btrfs_get_extent() would return -EEXIST.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      cd77f4f8
    • Liu Bo's avatar
      Btrfs: extent map selftest: buffered write vs dio read · fd87526f
      Liu Bo authored
      This test case simulates the racy situation of buffered write vs dio
      read, and see if btrfs_get_extent() would return -EEXIST.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      fd87526f
    • Liu Bo's avatar
      Btrfs: add extent map selftests · 72b28077
      Liu Bo authored
      We've observed that btrfs_get_extent() and merge_extent_mapping() could
      return -EEXIST in several cases, and they are caused by some racy
      condition, e.g dio read vs dio write, which makes the problem very tricky
      to reproduce.
      
      This adds extent map selftests in order to simulate those racy situations.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      [ minor string adjustments ]
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      72b28077
    • Liu Bo's avatar
      Btrfs: move extent map specific code to extent_map.c · c04e61b5
      Liu Bo authored
      These helpers are extent map specific, move them to extent_map.c.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      c04e61b5
    • Liu Bo's avatar
      Btrfs: add helper for em merge logic · 7b4df058
      Liu Bo authored
      This is a prepare work for the following extent map selftest, which
      runs tests against em merge logic.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      7b4df058
    • Liu Bo's avatar
      Btrfs: fix unexpected EEXIST from btrfs_get_extent · 18e83ac7
      Liu Bo authored
      This fixes a corner case that is caused by a race of dio write vs dio
      read/write.
      
      Here is how the race could happen.
      
      Suppose that no extent map has been loaded into memory yet.
      There is a file extent [0, 32K), two jobs are running concurrently
      against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
      read from [0, 4K) or [4K, 8K).
      
      t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
      
      ------------------------------------------------------
                   t1                                t2
            btrfs_get_blocks_direct()         btrfs_get_blocks_direct()
             -> btrfs_get_extent()              -> btrfs_get_extent()
                 -> lookup_extent_mapping()
                 -> add_extent_mapping()            -> lookup_extent_mapping()
                    # load [0, 32K)
             -> btrfs_new_extent_direct()
                 -> btrfs_drop_extent_cache()
                    # split [0, 32K) and
      	      # drop [8K, 32K)
                 -> add_extent_mapping()
                    # add [8K, 32K)
                                                    -> add_extent_mapping()
                                                       # handle -EEXIST when adding
                                                       # [0, 32K)
      ------------------------------------------------------
      About how t2(dio read/write) runs into -EEXIST:
      
      a) add_extent_mapping() gets -EEXIST for adding em [0, 32k),
      
      b) search_extent_mapping() then returns [0, 8k) as the existing em,
         even though start == existing->start, em is [0, 32k) so that
         extent_map_end(em) > extent_map_end(existing), i.e. 32k > 8k,
      
      c) then it goes thru merge_extent_mapping() which tries to add a [8k, 8k)
         (with a length 0) and returns -EEXIST as [8k, 32k) is already in tree,
      
      d) so btrfs_get_extent() ends up returning -EEXIST to dio read/write,
         which is confusing applications.
      
      Here I conclude all the possible situations,
      1) start < existing->start
      
                  +-----------+em+-----------+
      +--prev---+ |     +-------------+      |
      |         | |     |             |      |
      +---------+ +     +---+existing++      ++
                      +
                      |
                      +
                   start
      
      2) start == existing->start
      
            +------------em------------+
            |     +-------------+      |
            |     |             |      |
            +     +----existing-+      +
                  |
                  |
                  +
               start
      
      3) start > existing->start && start < (existing->start + existing->len)
      
            +------------em------------+
            |     +-------------+      |
            |     |             |      |
            +     +----existing-+      +
                     |
                     |
                     +
                   start
      
      4) start >= (existing->start + existing->len)
      
      +-----------+em+-----------+
      |     +-------------+      | +--next---+
      |     |             |      | |         |
      +     +---+existing++      + +---------+
                            +
                            |
                            +
                         start
      
      As we can see, it turns out that if start is within existing em (front
      inclusive), then the existing em should be returned as is, otherwise,
      we try our best to merge candidate em with sibling ems to form a
      larger em (in order to reduce the total number of em).
      Reported-by: default avatarDavid Vallender <david.vallender@landmark.co.uk>
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      18e83ac7
    • Liu Bo's avatar
      Btrfs: fix incorrect block_len in merge_extent_mapping · a520a7e0
      Liu Bo authored
      %block_len could be checked on deciding if two em are mergeable.
      
      merge_extent_mapping() has only added the front pad if the front part
      of em gets truncated, but it's possible that the end part gets
      truncated.
      
      For both compressed extent and inline extent, em->block_len is not
      adjusted accordingly, and for regular extent, em->block_len always
      equals to em->len, hence this sets em->block_len with em->len.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      a520a7e0
    • Matthew Wilcox's avatar
      btrfs: Remove unused readahead spinlock · 3cbf26da
      Matthew Wilcox authored
      The reada_lock in struct btrfs_device was only initialised, and not
      actually used.  That's good because there's another lock also called
      reada_lock in the btrfs_fs_info that was quite heavily used.  Remove
      this one.
      Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      3cbf26da
    • Liu Bo's avatar
      Btrfs: raid56: fix race between merge_bio and rbio_orig_end_io · 7583d8d0
      Liu Bo authored
      Before rbio_orig_end_io() goes to free rbio, rbio may get merged with
      more bios from other rbios and rbio->bio_list becomes non-empty,
      in that case, these newly merged bios don't end properly.
      
      Once unlock_stripe() is done, rbio->bio_list will not be updated any
      more and we can call bio_endio() on all queued bios.
      
      It should only happen in error-out cases, the normal path of recover
      and full stripe write have already set RBIO_RMW_LOCKED_BIT to disable
      merge before doing IO, so rbio_orig_end_io() called by them doesn't
      have the above issue.
      Reported-by: default avatarJérôme Carretero <cJ-ko@zougloub.eu>
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      7583d8d0
    • Liu Bo's avatar
      Btrfs: do not cache rbio pages if using raid6 recover · 44ac474d
      Liu Bo authored
      Since raid6 recover tries all possible combinations of failed stripes,
      
      - when raid6 rebuild algorithm is used, i.e. raid6_datap_recov() and
        raid6_2data_recov(), it may change the in-memory content of failed
        stripes, if such a raid bio is cached, a later raid write rmw or recover
        can steal @stripe_pages from it instead of reading from disks, such that
        it carries the wrong content to do write rmw or recovery and ends up
        with corruption or recovery failures.
      
      - when raid5 rebuild algorithm is used, i.e. xor, raid bio can be cached
        because the only failed stripe which contains @rbio->bio_pages gets
        modified, others remain the same so that their in-memory content is
        consistent with their on-disk content.
      
      This adds a check to skip caching rbio if using raid6 recover.
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      44ac474d
    • Liu Bo's avatar
      Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all · 0198e5b7
      Liu Bo authored
      Bio iterated by set_bio_pages_uptodate() is raid56 internal one, so it
      will never be a BIO_CLONED bio, and since this is called by end_io
      functions, bio->bi_iter.bi_size is zero, we mustn't use
      bio_for_each_segment() as that is a no-op if bi_size is zero.
      
      Fixes: 6592e58c ("Btrfs: fix write corruption due to bio cloning on raid5/6")
      Cc: <stable@vger.kernel.org> # v4.12-rc6+
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      0198e5b7
    • Su Yue's avatar
      btrfs: correct wrong comment about magic number of index_cnt · df6703e1
      Su Yue authored
      There is no function named btrfs_get_inode_index_count.
      Explanation for magic number index_cnt=2 in btrfs_new_inode() is
      actually located in btrfs_set_inode_index_count().
      
      So replace 'btrfs_get_inode_index_count' in the comment by
      'btrfs_set_inode_index_count'.
      Signed-off-by: default avatarSu Yue <suy.fnst@cn.fujitsu.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      df6703e1
    • Nikolay Borisov's avatar
      btrfs: Make btrfs_inode_rsv_release static · d2560ebd
      Nikolay Borisov authored
      It's not used outside of extent-tree so there is no reason to not be
      static.
      Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      d2560ebd
    • Anand Jain's avatar
      btrfs: cleanup btrfs_free_stale_device() usage · 1c94da9d
      Anand Jain authored
      We call btrfs_free_stale_device() only when we alloc a new struct
      btrfs_device (ret=1), so move it closer to where we alloc the new
      device. Also drop the comments.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      1c94da9d
    • David Sterba's avatar
      btrfs: tree-check: reduce stack consumption in check_dir_item · e2683fc9
      David Sterba authored
      I've noticed that the updated item checker stack consumption increased
      dramatically in 542f5385e20cf97447 ("btrfs: tree-checker: Add checker
      for dir item")
      
      tree-checker.c:check_leaf                    +552 (176 -> 728)
      
      The array is 255 bytes long, dynamic allocation would slow down the
      sanity checks so it's more reasonable to keep it on-stack. Moving the
      variable to the scope of use reduces the stack usage again
      
      tree-checker.c:check_leaf                    -264 (728 -> 464)
      Reviewed-by: default avatarJosef Bacik <jbacik@fb.com>
      Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      e2683fc9
    • Xiongfeng Wang's avatar
      btrfs: use correct string length in DEV_INFO ioctl · 6670d4c2
      Xiongfeng Wang authored
      gcc-8 reports:
      
      fs/btrfs/ioctl.c: In function 'btrfs_ioctl':
      ./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
      bound 1024 equals destination size [-Wstringop-truncation]
      
      We need one less byte or call strlcpy() to make it a nul-terminated
      string. This is done on the next line anyway, but we want to avoid the
      warning.
      Signed-off-by: default avatarXiongfeng Wang <xiongfeng.wang@linaro.org>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      [ update changelog ]
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      6670d4c2
    • Anand Jain's avatar
      btrfs: fail mount when sb flag is not in BTRFS_SUPER_FLAG_SUPP · 6f794e3c
      Anand Jain authored
      It appears from the original commit [1] that there isn't any design
      specific reason not to fail the mount instead of just warning. This
      patch will change it to fail.
      
      [1]
       commit 319e4d06
          btrfs: Enhance super validation check
      
      Fixes: 319e4d06 ("btrfs: Enhance super validation check")
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      6f794e3c
    • Anand Jain's avatar
      btrfs: add support for SUPER_FLAG_CHANGING_FSID · 98820a7e
      Anand Jain authored
      The UUID change by btrfstune sets SUPER_FLAG_CHANGING_FSID and resets it
      only when changing fsid is complete. Its not a good idea to mount the
      device anything in between, reading metadata blocks would fail with UUID
      mismatch.
      
      This patch doesn't add SUPER_FLAG_CHANGING_FSID into
      BTRFS_SUPER_FLAG_SUPP list, so mount will fail (along with the fix in
      the next patch) when SUPER_FLAG_CHANGING_FSID is set.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      [ update changelog ]
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      98820a7e
    • Anand Jain's avatar
      btrfs: define SUPER_FLAG_METADUMP_V2 · e2731e55
      Anand Jain authored
      btrfs-progs uses super flag bit BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34).
      So just define that in kernel so that we know its been used.
      Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      e2731e55
    • Liu Bo's avatar
      Btrfs: avoid losing data raid profile when deleting a device · a6f93c71
      Liu Bo authored
      We've avoided data losing raid profile when doing balance, but it
      turns out that deleting a device could also result in the same
      problem.
      
      Say we have 3 disks, and they're created with '-d raid1' profile.
      
      - We have chunk P (the only data chunk on the empty btrfs).
      
      - Suppose that chunk P's two raid1 copies reside in disk A and disk B.
      
      - Now, 'btrfs device remove disk B'
               btrfs_rm_device()
      	   -> btrfs_shrink_device()
      	      -> btrfs_relocate_chunk() #relocate any chunk on disk B
      	      	 			 to other places.
      
      - Chunk P will be removed and a new chunk will be created to hold
        those data, but as chunk P is the only one holding raid1 profile,
        after it goes away, the new chunk will be created as single profile
        which is our default profile.
      
      This fixes the problem by creating an empty data chunk before
      relocating the data chunk.
      
      Metadata/System chunk are supposed to have non-zero bytes all the time
      so their raid profile is preserved.
      Reported-by: default avatarJames Alandt <James.Alandt@wdc.com>
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      a6f93c71
    • Filipe Manana's avatar
      Btrfs: fix space leak after fallocate and zero range operations · 81fdf638
      Filipe Manana authored
      If we do a buffered write after a zero range operation that has an
      unaligned (with the filesystem's sector size) end which also falls within
      an unwritten (prealloc) extent that is currently beyond the inode's
      i_size, and the zero range operation has the flag FALLOC_FL_KEEP_SIZE,
      we end up leaking data and metadata space. This happens because when
      zeroing a range we call btrfs_truncate_block(), which does delalloc
      (loads the page and partially zeroes its content), and in the buffered
      write path we only clear existing delalloc space reservation for the
      range we are writing into if that range starts at an offset smaller then
      the inode's i_size, which makes sense since we can not have delalloc
      extents beyond the i_size, only unwritten extents are allowed.
      
      Example reproducer:
      
       $ mkfs.btrfs -f /dev/sdb
       $ mount /dev/sdb /mnt
       $ xfs_io -f -c "falloc -k 428K 4K" /mnt/foobar
       $ xfs_io -c "fzero -k 0 430K" /mnt/foobar
       $ xfs_io -c "pwrite -S 0xaa 428K 4K" /mnt/foobar
       $ umount /mnt
      
      After the unmount we get the metadata and data space leaks reported in
      dmesg/syslog:
      
       [95794.602253] ------------[ cut here ]------------
       [95794.603322] WARNING: CPU: 0 PID: 31496 at fs/btrfs/inode.c:9561 btrfs_destroy_inode+0x4e/0x206 [btrfs]
       [95794.605167] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.613000] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.614448] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.615972] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.617114] RIP: 0010:btrfs_destroy_inode+0x4e/0x206 [btrfs]
       [95794.618001] RSP: 0018:ffffc90001737d00 EFLAGS: 00010202
       [95794.618721] RAX: 0000000000000000 RBX: ffff880070fa1418 RCX: ffffc90001737c7c
       [95794.619645] RDX: 0000000175aa0240 RSI: 0000000000000001 RDI: ffff880070fa1418
       [95794.620711] RBP: ffffc90001737d38 R08: 0000000000000000 R09: 0000000000000000
       [95794.621932] R10: ffffc90001737c48 R11: ffff88007123e158 R12: ffff880075b6a000
       [95794.623124] R13: ffff88006145c000 R14: ffff880070fa1418 R15: ffff880070c3b4a0
       [95794.624188] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.625578] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.626522] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.627647] Call Trace:
       [95794.628128]  destroy_inode+0x3d/0x55
       [95794.628573]  evict+0x177/0x17e
       [95794.629010]  dispose_list+0x50/0x71
       [95794.629478]  evict_inodes+0x132/0x141
       [95794.630289]  generic_shutdown_super+0x3f/0x10b
       [95794.630864]  kill_anon_super+0x12/0x1c
       [95794.631383]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.631930]  deactivate_locked_super+0x30/0x68
       [95794.632539]  deactivate_super+0x36/0x39
       [95794.633200]  cleanup_mnt+0x49/0x67
       [95794.633818]  __cleanup_mnt+0x12/0x14
       [95794.634416]  task_work_run+0x82/0xa6
       [95794.634902]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.635525]  syscall_return_slowpath+0x18c/0x1af
       [95794.636122]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.636834] RIP: 0033:0x7fa678cb99a7
       [95794.637370] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.638672] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.639596] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.640703] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.641773] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.643150] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.644249] Code: ff 4c 8b a8 80 06 00 00 48 8b 87 c0 01 00 00 48 85 c0 74 02 0f ff 48 83 bb e0 02 00 00 00 74 02 0f ff 83 bb 3c ff ff ff 00 74 02 <0f> ff 83 bb 40 ff ff ff 00 74 02 0f ff 48 83 bb f8 fe ff ff 00
       [95794.646929] ---[ end trace e95877675c6ec007 ]---
       [95794.647751] ------------[ cut here ]------------
       [95794.648509] WARNING: CPU: 0 PID: 31496 at fs/btrfs/inode.c:9562 btrfs_destroy_inode+0x59/0x206 [btrfs]
       [95794.649842] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.654659] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.655894] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.657546] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.658433] RIP: 0010:btrfs_destroy_inode+0x59/0x206 [btrfs]
       [95794.659279] RSP: 0018:ffffc90001737d00 EFLAGS: 00010202
       [95794.660054] RAX: 0000000000000000 RBX: ffff880070fa1418 RCX: ffffc90001737c7c
       [95794.660753] RDX: 0000000175aa0240 RSI: 0000000000000001 RDI: ffff880070fa1418
       [95794.661513] RBP: ffffc90001737d38 R08: 0000000000000000 R09: 0000000000000000
       [95794.662289] R10: ffffc90001737c48 R11: ffff88007123e158 R12: ffff880075b6a000
       [95794.663393] R13: ffff88006145c000 R14: ffff880070fa1418 R15: ffff880070c3b4a0
       [95794.664342] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.665673] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.666593] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.667629] Call Trace:
       [95794.668065]  destroy_inode+0x3d/0x55
       [95794.668637]  evict+0x177/0x17e
       [95794.669179]  dispose_list+0x50/0x71
       [95794.669830]  evict_inodes+0x132/0x141
       [95794.670416]  generic_shutdown_super+0x3f/0x10b
       [95794.671103]  kill_anon_super+0x12/0x1c
       [95794.671786]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.672552]  deactivate_locked_super+0x30/0x68
       [95794.673393]  deactivate_super+0x36/0x39
       [95794.674107]  cleanup_mnt+0x49/0x67
       [95794.674706]  __cleanup_mnt+0x12/0x14
       [95794.675279]  task_work_run+0x82/0xa6
       [95794.675795]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.676507]  syscall_return_slowpath+0x18c/0x1af
       [95794.677275]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.678006] RIP: 0033:0x7fa678cb99a7
       [95794.678600] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.679739] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.680779] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.681837] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.682867] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.683891] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.684843] Code: c0 01 00 00 48 85 c0 74 02 0f ff 48 83 bb e0 02 00 00 00 74 02 0f ff 83 bb 3c ff ff ff 00 74 02 0f ff 83 bb 40 ff ff ff 00 74 02 <0f> ff 48 83 bb f8 fe ff ff 00 74 02 0f ff 48 83 bb 00 ff ff ff
       [95794.687156] ---[ end trace e95877675c6ec008 ]---
       [95794.687876] ------------[ cut here ]------------
       [95794.688579] WARNING: CPU: 0 PID: 31496 at fs/btrfs/inode.c:9565 btrfs_destroy_inode+0x7d/0x206 [btrfs]
       [95794.689735] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.695015] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.696396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.697956] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.698925] RIP: 0010:btrfs_destroy_inode+0x7d/0x206 [btrfs]
       [95794.699763] RSP: 0018:ffffc90001737d00 EFLAGS: 00010206
       [95794.700434] RAX: 0000000000000000 RBX: ffff880070fa1418 RCX: ffffc90001737c7c
       [95794.701445] RDX: 0000000175aa0240 RSI: 0000000000000001 RDI: ffff880070fa1418
       [95794.702448] RBP: ffffc90001737d38 R08: 0000000000000000 R09: 0000000000000000
       [95794.703557] R10: ffffc90001737c48 R11: ffff88007123e158 R12: ffff880075b6a000
       [95794.704441] R13: ffff88006145c000 R14: ffff880070fa1418 R15: ffff880070c3b4a0
       [95794.705270] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.706341] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.707001] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.708030] Call Trace:
       [95794.708466]  destroy_inode+0x3d/0x55
       [95794.709071]  evict+0x177/0x17e
       [95794.709497]  dispose_list+0x50/0x71
       [95794.709973]  evict_inodes+0x132/0x141
       [95794.710564]  generic_shutdown_super+0x3f/0x10b
       [95794.711200]  kill_anon_super+0x12/0x1c
       [95794.711633]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.712139]  deactivate_locked_super+0x30/0x68
       [95794.712608]  deactivate_super+0x36/0x39
       [95794.713093]  cleanup_mnt+0x49/0x67
       [95794.713514]  __cleanup_mnt+0x12/0x14
       [95794.713933]  task_work_run+0x82/0xa6
       [95794.714543]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.715247]  syscall_return_slowpath+0x18c/0x1af
       [95794.715952]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.716653] RIP: 0033:0x7fa678cb99a7
       [95794.721100] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.722052] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.722856] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.723698] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.724736] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.725928] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.726728] Code: 40 ff ff ff 00 74 02 0f ff 48 83 bb f8 fe ff ff 00 74 02 0f ff 48 83 bb 00 ff ff ff 00 74 02 0f ff 48 83 bb 30 ff ff ff 00 74 02 <0f> ff 48 83 bb 08 ff ff ff 00 74 02 0f ff 4d 85 e4 0f 84 52 01
       [95794.729203] ---[ end trace e95877675c6ec009 ]---
       [95794.841054] ------------[ cut here ]------------
       [95794.841829] WARNING: CPU: 0 PID: 31496 at fs/btrfs/extent-tree.c:5831 btrfs_free_block_groups+0x235/0x36a [btrfs]
       [95794.843425] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.850658] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.852590] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.854752] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.855812] RIP: 0010:btrfs_free_block_groups+0x235/0x36a [btrfs]
       [95794.856811] RSP: 0018:ffffc90001737d70 EFLAGS: 00010206
       [95794.857805] RAX: 0000000080000000 RBX: ffff88006145c000 RCX: 0000000000000001
       [95794.859014] RDX: 00000001810af668 RSI: 0000000000000002 RDI: 00000000ffffffff
       [95794.860270] RBP: ffffc90001737d98 R08: 0000000000000000 R09: ffffffff817e22b9
       [95794.861525] R10: ffffc90001737c80 R11: 00000000000337fd R12: 0000000000000000
       [95794.862700] R13: ffff88006145c0c0 R14: ffff88021b61a800 R15: ffff88006145c100
       [95794.863810] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.865149] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.866099] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.867198] Call Trace:
       [95794.867626]  close_ctree+0x1db/0x2b8 [btrfs]
       [95794.868188]  ? evict_inodes+0x132/0x141
       [95794.869037]  btrfs_put_super+0x15/0x17 [btrfs]
       [95794.870400]  generic_shutdown_super+0x6a/0x10b
       [95794.871262]  kill_anon_super+0x12/0x1c
       [95794.872046]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.872746]  deactivate_locked_super+0x30/0x68
       [95794.873687]  deactivate_super+0x36/0x39
       [95794.874639]  cleanup_mnt+0x49/0x67
       [95794.875504]  __cleanup_mnt+0x12/0x14
       [95794.876126]  task_work_run+0x82/0xa6
       [95794.876788]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.877777]  syscall_return_slowpath+0x18c/0x1af
       [95794.878381]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.878888] RIP: 0033:0x7fa678cb99a7
       [95794.879307] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.880204] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.881640] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.882690] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.883538] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.884562] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.885664] Code: 89 ef e8 07 ec 32 e1 e8 9d c0 ea e0 48 8d b3 28 02 00 00 48 83 c9 ff 31 d2 48 89 df e8 29 c5 ff ff 48 83 bb 80 02 00 00 00 74 02 <0f> ff 48 83 bb 88 02 00 00 00 74 02 0f ff 48 83 bb d8 02 00 00
       [95794.887980] ---[ end trace e95877675c6ec00a ]---
       [95794.888739] ------------[ cut here ]------------
       [95794.889405] WARNING: CPU: 0 PID: 31496 at fs/btrfs/extent-tree.c:5832 btrfs_free_block_groups+0x241/0x36a [btrfs]
       [95794.891020] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.897551] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.898509] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.899685] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.900592] RIP: 0010:btrfs_free_block_groups+0x241/0x36a [btrfs]
       [95794.901387] RSP: 0018:ffffc90001737d70 EFLAGS: 00010206
       [95794.902300] RAX: 0000000080000000 RBX: ffff88006145c000 RCX: 0000000000000001
       [95794.903260] RDX: 00000001810af668 RSI: 0000000000000002 RDI: 00000000ffffffff
       [95794.904332] RBP: ffffc90001737d98 R08: 0000000000000000 R09: ffffffff817e22b9
       [95794.905300] R10: ffffc90001737c80 R11: 00000000000337fd R12: 0000000000000000
       [95794.906439] R13: ffff88006145c0c0 R14: ffff88021b61a800 R15: ffff88006145c100
       [95794.907459] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.908625] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.909511] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.910630] Call Trace:
       [95794.911153]  close_ctree+0x1db/0x2b8 [btrfs]
       [95794.911837]  ? evict_inodes+0x132/0x141
       [95794.912344]  btrfs_put_super+0x15/0x17 [btrfs]
       [95794.912975]  generic_shutdown_super+0x6a/0x10b
       [95794.913788]  kill_anon_super+0x12/0x1c
       [95794.914424]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.915142]  deactivate_locked_super+0x30/0x68
       [95794.915831]  deactivate_super+0x36/0x39
       [95794.916433]  cleanup_mnt+0x49/0x67
       [95794.917045]  __cleanup_mnt+0x12/0x14
       [95794.917665]  task_work_run+0x82/0xa6
       [95794.918309]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.919021]  syscall_return_slowpath+0x18c/0x1af
       [95794.919722]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.920426] RIP: 0033:0x7fa678cb99a7
       [95794.921039] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.922303] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.923335] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.924364] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.925435] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.926533] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.927557] Code: 48 8d b3 28 02 00 00 48 83 c9 ff 31 d2 48 89 df e8 29 c5 ff ff 48 83 bb 80 02 00 00 00 74 02 0f ff 48 83 bb 88 02 00 00 00 74 02 <0f> ff 48 83 bb d8 02 00 00 00 74 02 0f ff 48 83 bb e0 02 00 00
       [95794.930166] ---[ end trace e95877675c6ec00b ]---
       [95794.930961] ------------[ cut here ]------------
       [95794.931727] WARNING: CPU: 0 PID: 31496 at fs/btrfs/extent-tree.c:9953 btrfs_free_block_groups+0x2bc/0x36a [btrfs]
       [95794.932729] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.938394] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.939842] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.941455] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.942336] RIP: 0010:btrfs_free_block_groups+0x2bc/0x36a [btrfs]
       [95794.943268] RSP: 0018:ffffc90001737d70 EFLAGS: 00010206
       [95794.944127] RAX: ffff8802004fd0e8 RBX: ffff88006145c000 RCX: 0000000000000001
       [95794.945211] RDX: 00000001810af668 RSI: 0000000000000002 RDI: 00000000ffffffff
       [95794.946316] RBP: ffffc90001737d98 R08: 0000000000000000 R09: ffffffff817e22b9
       [95794.947271] R10: ffffc90001737c80 R11: 00000000000337fd R12: ffff8802004fd0e8
       [95794.948219] R13: ffff88006145c0c0 R14: ffff88006145e598 R15: ffff88006145c100
       [95794.949193] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.950495] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.951338] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95794.952361] Call Trace:
       [95794.952811]  close_ctree+0x1db/0x2b8 [btrfs]
       [95794.953522]  ? evict_inodes+0x132/0x141
       [95794.954543]  btrfs_put_super+0x15/0x17 [btrfs]
       [95794.955231]  generic_shutdown_super+0x6a/0x10b
       [95794.955916]  kill_anon_super+0x12/0x1c
       [95794.956414]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95794.956953]  deactivate_locked_super+0x30/0x68
       [95794.957635]  deactivate_super+0x36/0x39
       [95794.958256]  cleanup_mnt+0x49/0x67
       [95794.958701]  __cleanup_mnt+0x12/0x14
       [95794.959181]  task_work_run+0x82/0xa6
       [95794.959635]  prepare_exit_to_usermode+0xe1/0x10c
       [95794.960182]  syscall_return_slowpath+0x18c/0x1af
       [95794.960731]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95794.961438] RIP: 0033:0x7fa678cb99a7
       [95794.961990] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95794.963111] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95794.963975] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95794.964680] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95794.965763] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95794.966868] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95794.967800] Code: 00 00 00 4c 8b a3 98 25 00 00 49 83 bc 24 60 ff ff ff 00 75 16 49 83 bc 24 68 ff ff ff 00 75 0b 49 83 bc 24 70 ff ff ff 00 74 16 <0f> ff 49 8d b4 24 18 ff ff ff 31 c9 31 d2 48 89 df e8 93 7a ff
       [95794.970629] ---[ end trace e95877675c6ec00c ]---
       [95794.971451] BTRFS info (device sdi): space_info 1 has 7680000 free, is not full
       [95794.972351] BTRFS info (device sdi): space_info total=8388608, used=704512, pinned=0, reserved=0, may_use=4096, readonly=0
       [95794.973595] ------------[ cut here ]------------
       [95794.974353] WARNING: CPU: 0 PID: 31496 at fs/btrfs/extent-tree.c:9953 btrfs_free_block_groups+0x2bc/0x36a [btrfs]
       [95794.980163] Modules linked in: btrfs xfs ppdev ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper parport_pc psmouse sg i2c_piix4 parport i2c_core evdev pcspkr button serio_raw sunrpc loop autofs4 ext4 crc16 mbcache jbd2 zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod virtio_scsi ata_generic crc32c_intel ata_piix floppy virtio_pci virtio_ring virtio libata scsi_mod e1000 [last unloaded: btrfs]
       [95794.986461] CPU: 0 PID: 31496 Comm: umount Tainted: G        W       4.14.0-rc6-btrfs-next-54+ #1
       [95794.987591] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014
       [95794.988929] task: ffff880075aa0240 task.stack: ffffc90001734000
       [95794.989922] RIP: 0010:btrfs_free_block_groups+0x2bc/0x36a [btrfs]
       [95794.990715] RSP: 0018:ffffc90001737d70 EFLAGS: 00010206
       [95794.991431] RAX: ffff88020f6e70e8 RBX: ffff88006145c000 RCX: ffffffff8115a906
       [95794.992455] RDX: ffffffff8115a902 RSI: ffff880075aa0b40 RDI: ffff880075aa0b40
       [95794.993535] RBP: ffffc90001737d98 R08: 0000000000000020 R09: fffffffffffffff7
       [95794.994573] R10: 00000000ffffffc4 R11: ffff8800633b1bc0 R12: ffff88020f6e70e8
       [95794.996250] R13: 0000000000000038 R14: ffff88006145e598 R15: 0000000000000000
       [95794.997233] FS:  00007fa6793c92c0(0000) GS:ffff88023fc00000(0000) knlGS:0000000000000000
       [95794.998592] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [95794.999484] CR2: 000056338670d048 CR3: 00000000610dc005 CR4: 00000000001606f0
       [95795.000542] Call Trace:
       [95795.001138]  close_ctree+0x1db/0x2b8 [btrfs]
       [95795.001885]  ? evict_inodes+0x132/0x141
       [95795.002407]  btrfs_put_super+0x15/0x17 [btrfs]
       [95795.003093]  generic_shutdown_super+0x6a/0x10b
       [95795.003720]  kill_anon_super+0x12/0x1c
       [95795.004353]  btrfs_kill_super+0x16/0x21 [btrfs]
       [95795.005095]  deactivate_locked_super+0x30/0x68
       [95795.005716]  deactivate_super+0x36/0x39
       [95795.006388]  cleanup_mnt+0x49/0x67
       [95795.006939]  __cleanup_mnt+0x12/0x14
       [95795.007512]  task_work_run+0x82/0xa6
       [95795.008124]  prepare_exit_to_usermode+0xe1/0x10c
       [95795.008994]  syscall_return_slowpath+0x18c/0x1af
       [95795.009831]  entry_SYSCALL_64_fastpath+0xab/0xad
       [95795.010610] RIP: 0033:0x7fa678cb99a7
       [95795.011193] RSP: 002b:00007ffccf0aaed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
       [95795.012327] RAX: 0000000000000000 RBX: 0000563386706030 RCX: 00007fa678cb99a7
       [95795.013432] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000056338670ca90
       [95795.014558] RBP: 000056338670ca90 R08: 000056338670c740 R09: 0000000000000015
       [95795.015577] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fa6791bae64
       [95795.016569] R13: 0000000000000000 R14: 0000563386706210 R15: 00007ffccf0ab160
       [95795.017662] Code: 00 00 00 4c 8b a3 98 25 00 00 49 83 bc 24 60 ff ff ff 00 75 16 49 83 bc 24 68 ff ff ff 00 75 0b 49 83 bc 24 70 ff ff ff 00 74 16 <0f> ff 49 8d b4 24 18 ff ff ff 31 c9 31 d2 48 89 df e8 93 7a ff
       [95795.020538] ---[ end trace e95877675c6ec00d ]---
       [95795.021259] BTRFS info (device sdi): space_info 4 has 1072775168 free, is not full
       [95795.022390] BTRFS info (device sdi): space_info total=1073741824, used=114688, pinned=0, reserved=0, may_use=786432, readonly=65536
      
      Fix this by ensuring the zero range operation does not call
      btrfs_truncate_block() if the corresponding extent is an unwritten one
      (it's pointless anyway, since reading from an unwritten extent yields
      zeroes).
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      Tested-by: default avatarNikolay Borisov <nborisov@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      81fdf638
    • Filipe Manana's avatar
      Btrfs: fix missing inode i_size update after zero range operation · 9f13ce74
      Filipe Manana authored
      For a fallocate's zero range operation that targets a range with an end
      that is not aligned to the sector size, we can end up not updating the
      inode's i_size. This happens when the last page of the range maps to an
      unwritten (prealloc) extent and before that last page we have either a
      hole or a written extent. This is because in this scenario we relied
      on a call to btrfs_prealloc_file_range() to update the inode's i_size,
      however it can only update the i_size to the "down aligned" end of the
      range.
      
      Example:
      
       $ mkfs.btrfs -f /dev/sdc
       $ mount /dev/sdc /mnt
       $ xfs_io -f -c "pwrite -S 0xff 0 428K" /mnt/foobar
       $ xfs_io -c "falloc -k 428K 4K" /mnt/foobar
       $ xfs_io -c "fzero 0 430K" /mnt/foobar
       $ du --bytes /mnt/foobar
       438272	/mnt/foobar
      
      The inode's i_size was left as 428Kb (438272 bytes) when it should have
      been updated to 430Kb (440320 bytes).
      Fix this by always updating the inode's i_size explicitly after zeroing
      the range.
      
      Fixes: ba6d5887946ff86d93dc ("Btrfs: add support for fallocate's zero range operation")
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      9f13ce74
    • Filipe Manana's avatar
      Btrfs: use cached state when dirtying pages during buffered write · 94f45071
      Filipe Manana authored
      During a buffered IO write, we can have an extent state that we got when
      we locked the range (if the range starts at an offset lower than eof), so
      always pass it to btrfs_dirty_pages() so that setting the delalloc bit
      in the range does not need to do a full search in the inode's io tree,
      saving time and reducing the amount of time we hold the io tree's lock.
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      94f45071
    • Filipe Manana's avatar
      Btrfs: add support for fallocate's zero range operation · f27451f2
      Filipe Manana authored
      This implements support the zero range operation of fallocate. For now
      at least it's as simple as possible while reusing most of the existing
      fallocate and hole punching infrastructure.
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
      f27451f2