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linux-stable/fs/btrfs
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Johannes Thumshirn 2072e75b49 btrfs: fix percent calculation for bg reclaim message 
commit 95cd356ca2 upstream.

We have a report, that the info message for block-group reclaim is
crossing the 100% used mark.

This is happening as we were truncating the divisor for the division
(the block_group->length) to a 32bit value.

Fix this by using div64_u64() to not truncate the divisor.

In the worst case, it can lead to a div by zero error and should be
possible to trigger on 4 disks RAID0, and each device is large enough:

  $ mkfs.btrfs  -f /dev/test/scratch[1234] -m raid1 -d raid0
  btrfs-progs v6.1
  [...]
  Filesystem size:    40.00GiB
  Block group profiles:
    Data:             RAID0             4.00GiB <<<
    Metadata:         RAID1           256.00MiB
    System:           RAID1             8.00MiB

Reported-by: Forza <forza@tnonline.net>
Link: https://lore.kernel.org/linux-btrfs/e99483.c11a58d.1863591ca52@tnonline.net/
Fixes: 5f93e776c6 ("btrfs: zoned: print unusable percentage when reclaiming block groups")
CC: stable@vger.kernel.org # 5.15+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add Qu's note ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-17 08:48:47 +01:00
..
tests btrfs: remove pointless and double ulist frees in error paths of qgroup tests 2022-11-26 09:24:32 +01:00
acl.c overlayfs update for 5.15 2021-09-02 09:21:27 -07:00
async-thread.c btrfs: fix memory ordering between normal and ordered work functions 2021-11-25 09:48:46 +01:00
async-thread.h
backref.c btrfs: fix resolving backrefs for inline extent followed by prealloc 2023-01-12 11:58:50 +01:00
backref.h btrfs: sink iterator parameter to btrfs_ioctl_logical_to_ino 2022-12-08 11:28:38 +01:00
block-group.c btrfs: fix percent calculation for bg reclaim message 2023-03-17 08:48:47 +01:00
block-group.h btrfs: fix space cache corruption and potential double allocations 2022-09-05 10:30:12 +02:00
block-rsv.c
block-rsv.h
btrfs_inode.h btrfs: put initial index value of a directory in a constant 2022-08-31 17:16:35 +02:00
check-integrity.c btrfs: rename btrfs_bio to btrfs_io_context 2022-07-21 21:24:32 +02:00
check-integrity.h
compression.c btrfs: remove unused parameter nr_pages in add_ra_bio_pages() 2022-04-20 09:34:04 +02:00
compression.h btrfs: rework btrfs_decompress_buf2page() 2021-08-23 13:19:04 +02:00
ctree.c btrfs: fix lockdep splat with reloc root extent buffers 2022-09-05 10:30:12 +02:00
ctree.h btrfs: fix space cache corruption and potential double allocations 2022-09-05 10:30:12 +02:00
delalloc-space.c btrfs: convert count_max_extents() to use fs_info->max_extent_size 2022-08-31 17:16:34 +02:00
delalloc-space.h
delayed-inode.c btrfs: add ro compat flags to inodes 2021-08-23 13:19:09 +02:00
delayed-inode.h
delayed-ref.c btrfs: fix lock inversion problem when doing qgroup extent tracing 2021-07-22 15:50:07 +02:00
delayed-ref.h btrfs: add additional parameters to btrfs_init_tree_ref/btrfs_init_data_ref 2022-07-12 16:34:50 +02:00
dev-replace.c btrfs: add info when mount fails due to stale replace target 2022-08-31 17:16:46 +02:00
dev-replace.h btrfs: zoned: mark block groups to copy for device-replace 2021-02-09 02:46:07 +01:00
dir-item.c btrfs: unify lookup return value when dir entry is missing 2021-10-07 22:06:32 +02:00
discard.c btrfs: hold block group refcount during async discard 2023-03-10 09:39:56 +01:00
discard.h
disk-io.c btrfs: do not abort transaction on failure to write log tree when syncing log 2023-01-24 07:22:46 +01:00
disk-io.h btrfs: make thaw time super block check to also verify checksum 2023-01-12 11:59:20 +01:00
export.c btrfs: fix type of parameter generation in btrfs_get_dentry 2022-11-10 18:15:38 +01:00
export.h btrfs: fix type of parameter generation in btrfs_get_dentry 2022-11-10 18:15:38 +01:00
extent-io-tree.h
extent-tree.c btrfs: always report error in run_one_delayed_ref() 2023-01-24 07:22:42 +01:00
extent_io.c btrfs: fix lockdep splat with reloc root extent buffers 2022-09-05 10:30:12 +02:00
extent_io.h btrfs: fix qgroup reserve overflow the qgroup limit 2022-04-13 20:59:23 +02:00
extent_map.c btrfs: rename btrfs_bio to btrfs_io_context 2022-07-21 21:24:32 +02:00
extent_map.h
file-item.c btrfs: make search_csum_tree return 0 if we get -EFBIG 2022-04-08 14:23:58 +02:00
file.c btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range 2022-12-31 13:14:47 +01:00
free-space-cache.c btrfs: dump extra info if one free space cache has more bitmaps than it should 2022-10-26 12:35:44 +02:00
free-space-cache.h btrfs: zoned: track unusable bytes for zones 2021-02-09 02:46:03 +01:00
free-space-tree.c btrfs: fix invalid delayed ref after subvolume creation failure 2022-07-12 16:34:50 +02:00
free-space-tree.h
inode-item.c
inode.c btrfs: remove root argument from btrfs_unlink_inode() 2022-09-05 10:30:09 +02:00
ioctl.c btrfs: replace strncpy() with strscpy() 2023-01-12 11:59:05 +01:00
Kconfig btrfs: disable build on platforms having page size 256K 2021-06-22 14:11:57 +02:00
locking.c btrfs: fix lockdep splat with reloc root extent buffers 2022-09-05 10:30:12 +02:00
locking.h btrfs: fix lockdep splat with reloc root extent buffers 2022-09-05 10:30:12 +02:00
lzo.c btrfs: prevent copying too big compressed lzo segment 2022-03-02 11:48:07 +01:00
Makefile btrfs: initial fsverity support 2021-08-23 13:19:09 +02:00
misc.h btrfs: use correct header for div_u64 in misc.h 2021-09-07 14:29:50 +02:00
ordered-data.c btrfs: zoned: fix double counting of split ordered extent 2021-09-07 14:30:41 +02:00
ordered-data.h btrfs: remove uptodate parameter from btrfs_dec_test_first_ordered_pending 2021-08-23 13:19:02 +02:00
orphan.c
print-tree.c
print-tree.h
props.c btrfs: props: change how empty value is interpreted 2021-06-22 14:11:58 +02:00
props.h
qgroup.c btrfs: fix race between quota rescan and disable leading to NULL pointer deref 2023-01-24 07:22:46 +01:00
qgroup.h btrfs: fix lock inversion problem when doing qgroup extent tracing 2021-07-22 15:50:07 +02:00
raid56.c btrfs: raid56: properly handle the error when unable to find the missing stripe 2022-11-26 09:24:31 +01:00
raid56.h btrfs: rename btrfs_bio to btrfs_io_context 2022-07-21 21:24:32 +02:00
rcu-string.h btrfs: replace strncpy() with strscpy() 2023-01-12 11:59:05 +01:00
reada.c btrfs: rename btrfs_bio to btrfs_io_context 2022-07-21 21:24:32 +02:00
ref-verify.c btrfs: stop doing GFP_KERNEL memory allocations in the ref verify tool 2021-08-23 13:19:00 +02:00
ref-verify.h
reflink.c btrfs: fix unexpected error path when reflinking an inline extent 2022-04-08 14:23:11 +02:00
reflink.h
relocation.c btrfs: fix lockdep splat with reloc root extent buffers 2022-09-05 10:30:12 +02:00
root-tree.c btrfs: fix silent failure when deleting root reference 2022-08-31 17:16:46 +02:00
scrub.c btrfs: scrub: try to fix super block errors 2022-10-26 12:35:44 +02:00
send.c btrfs: send: limit number of clones and allocated memory size 2023-03-03 11:45:52 +01:00
send.h
space-info.c btrfs: extend locking to all space_info members accesses 2022-04-08 14:23:02 +02:00
space-info.h btrfs: rip out btrfs_space_info::total_bytes_pinned 2021-06-22 14:55:25 +02:00
struct-funcs.c btrfs: add special case to setget helpers for 64k pages 2021-08-23 13:18:58 +02:00
subpage.c btrfs: subpage: fix a potential use-after-free in writeback helper 2021-08-23 13:19:05 +02:00
subpage.h btrfs: subpage: fix writeback which does not have ordered extent 2021-08-23 13:19:04 +02:00
super.c btrfs: make thaw time super block check to also verify checksum 2023-01-12 11:59:20 +01:00
sysfs.c btrfs: sysfs: normalize the error handling branch in btrfs_init_sysfs() 2022-12-02 17:41:12 +01:00
sysfs.h
transaction.c btrfs: make send work with concurrent block group relocation 2022-03-16 14:23:46 +01:00
transaction.h btrfs: do not start relocation until in progress drops are done 2022-03-08 19:12:54 +01:00
tree-checker.c btrfs: tree-checker: check for overlapping extent items 2022-09-05 10:30:12 +02:00
tree-checker.h
tree-defrag.c btrfs: fix an error handling path in btrfs_defrag_leaves() 2023-01-12 11:59:08 +01:00
tree-log.c btrfs: do not abort transaction on failure to write log tree when syncing log 2023-01-24 07:22:46 +01:00
tree-log.h btrfs: pass the dentry to btrfs_log_new_name() instead of the inode 2022-08-31 17:16:36 +02:00
tree-mod-log.c btrfs: fix race when picking most recent mod log operation for an old root 2021-04-20 19:27:17 +02:00
tree-mod-log.h btrfs: add and use helper to get lowest sequence number for the tree mod log 2021-04-19 17:25:17 +02:00
ulist.c
ulist.h
uuid-tree.c
verity.c btrfs: fix transaction handle leak after verity rollback failure 2021-09-17 19:29:41 +02:00
volumes.c btrfs: free device in btrfs_close_devices for a single device filesystem 2023-02-14 19:18:03 +01:00
volumes.h btrfs: zoned: initialize device's zone info for seeding 2022-11-16 09:58:27 +01:00
xattr.c btrfs: check if root is readonly while setting security xattr 2022-08-31 17:16:46 +02:00
xattr.h
zlib.c btrfs: zlib: zero-initialize zlib workspace 2023-02-14 19:17:56 +01:00
zoned.c btrfs: use kvcalloc in btrfs_get_dev_zone_info 2022-12-02 17:41:12 +01:00
zoned.h btrfs: zoned: revive max_zone_append_bytes 2022-08-31 17:16:34 +02:00
zstd.c Revert "btrfs: compression: drop kmap/kunmap from zstd" 2021-10-29 13:02:50 +02:00