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Jan Kara 384d87ef2c block: Do not discard buffers under a mounted filesystem 
Discarding blocks and buffers under a mounted filesystem is hardly
anything admin wants to do. Usually it will confuse the filesystem and
sometimes the loss of buffer_head state (including b_private field) can
even cause crashes like:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
PGD 0 P4D 0
Oops: 0002 [#1] SMP PTI
CPU: 4 PID: 203778 Comm: jbd2/dm-3-8 Kdump: loaded Tainted: G O     --------- -  - 4.18.0-147.5.0.5.h126.eulerosv2r9.x86_64 #1
Hardware name: Huawei RH2288H V3/BC11HGSA0, BIOS 1.57 08/11/2015
RIP: 0010:jbd2_journal_grab_journal_head+0x1b/0x40 [jbd2]
...
Call Trace:
 __jbd2_journal_insert_checkpoint+0x23/0x70 [jbd2]
 jbd2_journal_commit_transaction+0x155f/0x1b60 [jbd2]
 kjournald2+0xbd/0x270 [jbd2]

So if we don't have block device open with O_EXCL already, claim the
block device while we truncate buffer cache. This makes sure any
exclusive block device user (such as filesystem) cannot operate on the
device while we are discarding buffer cache.

Reported-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[axboe: fix !CONFIG_BLOCK error in truncate_bdev_range()]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-09-07 20:10:55 -06:00
..
9p
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
adfs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
affs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
afs
afs: Remove erroneous fallthough annotation
2020-08-27 14:33:01 -05:00
autofs
fs: autofs: delete repeated words in comments
2020-08-14 19:56:56 -07:00
befs
block: move struct block_device to blk_types.h
2020-06-24 09:16:02 -06:00
bfs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
btrfs
for-5.9-rc2-tag
2020-08-24 12:01:20 -07:00
cachefiles
cachefiles: switch to kernel_write
2020-07-08 08:27:56 +02:00
ceph
We have an inode number handling change, prompted by s390x which is
2020-08-28 10:33:04 -07:00
cifs
DFS SMB1 Fix
2020-08-30 11:38:21 -07:00
coda
docs: filesystems: convert coda.txt to ReST
2020-05-05 09:22:21 -06:00
configfs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
cramfs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
crypto
mm, treewide: rename kzfree() to kfree_sensitive()
2020-08-07 11:33:22 -07:00
debugfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-08-05 20:13:21 -07:00
devpts
…
dlm
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
ecryptfs
mm, treewide: rename kzfree() to kfree_sensitive()
2020-08-07 11:33:22 -07:00
efivarfs
efi/efivars: Expose RT service availability via efivars abstraction
2020-07-09 10:14:29 +03:00
efs
block: move struct block_device to blk_types.h
2020-06-24 09:16:02 -06:00
erofs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
exfat
exfat: retain 'VolumeFlags' properly
2020-08-12 08:31:13 +09:00
exportfs
…
ext2
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
ext4
\n
2020-08-28 10:57:14 -07:00
f2fs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fat
fat: fix fat_ra_init() for data clusters == 0
2020-08-12 10:58:01 -07:00
freevxfs
…
fscache
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
fuse
virtio: fixes, features
2020-08-11 14:34:17 -07:00
gfs2
Fix memory leak on filesystem withdraw
2020-08-28 10:41:00 -07:00
hfs
block: move block-related definitions out of fs.h
2020-06-24 09:16:02 -06:00
hfsplus
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
hostfs
…
hpfs
hpfs: fix warning due to superfluous semicolon
2020-06-06 10:08:17 -07:00
hugetlbfs
hugetlbfs: prevent filesystem stacking of hugetlbfs
2020-08-12 10:57:56 -07:00
iomap
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
isofs
Remove uninitialized_var() macro for v5.9-rc1
2020-08-04 13:49:43 -07:00
jbd2
jbd2: clean up checksum verification in do_one_pass()
2020-08-19 12:04:35 -04:00
jffs2
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
jfs
block: move struct block_device to blk_types.h
2020-06-24 09:16:02 -06:00
kernfs
fsnotify: pass dir and inode arguments to fsnotify()
2020-07-27 23:15:48 +02:00
lockd
…
minix
fs/minix: remove expected error message in block_to_path()
2020-08-12 10:58:00 -07:00
nfs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
nfs_common
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
nfsd
Fixes:
2020-08-25 18:01:36 -07:00
nilfs2
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
nls
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
notify
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
ntfs
ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type
2020-08-07 11:33:21 -07:00
ocfs2
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
omfs
treewide: Remove uninitialized_var() usage
2020-07-16 12:35:15 -07:00
openpromfs
…
orangefs
orangefs: remove unnecessary assignment to variable ret
2020-08-04 15:01:58 -04:00
overlayfs
Remove uninitialized_var() macro for v5.9-rc1
2020-08-04 13:49:43 -07:00
proc
mm, oom: make the calculation of oom badness more accurate
2020-08-12 10:57:56 -07:00
pstore
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
qnx4
…
qnx6
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
quota
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
ramfs
…
reiserfs
\n
2020-08-06 19:28:26 -07:00
romfs
romfs: fix uninitialized memory leak in romfs_dev_read()
2020-08-21 09:52:53 -07:00
squashfs
squashfs: avoid bio_alloc() failure with 1Mbyte blocks
2020-08-21 09:52:53 -07:00
sysfs
RDMA 5.8 merge window pull request
2020-06-05 14:05:57 -07:00
sysv
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
tracefs
…
ubifs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
udf
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
ufs
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
unicode
…
vboxsf
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
verity
fs-verity: use smp_load_acquire() for ->i_verity_info
2020-07-21 16:02:41 -07:00
xfs
\n
2020-08-28 10:57:14 -07:00
zonefs
zonefs: add zone-capacity support
2020-08-11 17:42:24 +09:00
aio.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
anon_inodes.c
…
attr.c
…
bad_inode.c
fs: move the fiemap definitions out of fs.h
2020-06-03 23:16:55 -04:00
binfmt_aout.c
exec: Rename flush_old_exec begin_new_exec
2020-05-07 16:55:47 -05:00
binfmt_elf_fdpic.c
Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 13:29:39 -07:00
binfmt_elf.c
kill elf_fpxregs_t
2020-07-27 14:29:23 -04:00
binfmt_em86.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_flat.c
binfmt_flat: revert "binfmt_flat: don't offset the data start"
2020-08-24 08:49:13 +10:00
binfmt_misc.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_script.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
block_dev.c
block: Do not discard buffers under a mounted filesystem
2020-09-07 20:10:55 -06:00
buffer.c
fs: Don't invalidate page buffers in block_write_full_page()
2020-09-07 10:23:07 -06:00
char_dev.c
vfs: allow unprivileged whiteout creation
2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c
Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK
2020-06-05 13:45:21 -07:00
compat.c
…
coredump.c
coredump: add %f for executable filename
2020-08-12 10:58:01 -07:00
d_path.c
…
dax.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
dcache.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
dcookies.c
…
direct-io.c
block: remove the bd_queue field from struct block_device
2020-07-01 08:08:20 -06:00
drop_caches.c
sysctl: pass kernel pointers to ->proc_handler
2020-04-27 02:07:40 -04:00
eventfd.c
eventfd: convert to f_op->read_iter()
2020-05-06 22:33:43 -04:00
eventpoll.c
do_epoll_ctl(): clean the failure exits up a bit
2020-08-22 18:25:52 -04:00
exec.c
mm/gup: remove task_struct pointer for all gup code
2020-08-12 10:58:04 -07:00
fcntl.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fhandle.c
…
file_table.c
Revert "fs: Do not check if there is a fsnotify watcher on pseudo inodes"
2020-06-29 09:40:55 -07:00
file.c
Merge branch 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 09:40:34 -07:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-10 15:36:22 -07:00
fs_context.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fs_parser.c
fs_parse: remove pr_notice() about each validation
2020-04-02 09:35:26 -07:00
fs_pin.c
…
fs_struct.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
fs_types.c
…
fs-writeback.c
writeback: Drop I_DIRTY_TIME_EXPIRE
2020-06-15 09:18:46 +02:00
fsopen.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
init.c
init: add an init_dup helper
2020-08-04 21:02:38 -04:00
inode.c
AFS Changes
2020-06-05 16:26:36 -07:00
internal.h
Merge branch 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 09:40:34 -07:00
io_uring.c
io_uring-5.9-2020-08-28
2020-08-28 16:23:16 -07:00
io-wq.c
io-wq: fix hang after cancelling pending hashed work
2020-08-23 11:38:50 -06:00
io-wq.h
io_uring/io-wq: move RLIMIT_FSIZE to io-wq
2020-07-24 13:00:44 -06:00
ioctl.c
fs: remove ksys_ioctl
2020-07-31 08:16:01 +02:00
Kconfig
tmpfs: support 64-bit inums per-sb
2020-08-07 11:33:24 -07:00
Kconfig.binfmt
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
libfs.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
locks.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
Makefile
init: add an init_mount helper
2020-07-31 08:17:51 +02:00
mbcache.c
…
mount.h
proc/mounts: add cursor
2020-05-14 16:44:24 +02:00
mpage.c
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
namei.c
exec: restore EACCES of S_ISDIR execve()
2020-08-14 19:56:56 -07:00
namespace.c
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 21:03:25 -07:00
no-block.c
…
nsfs.c
nsproxy: attach to namespaces via pidfds
2020-05-13 11:41:22 +02:00
open.c
exec: move S_ISREG() check earlier
2020-08-12 10:58:01 -07:00
pipe.c
Notifications over pipes + Keyring notifications
2020-06-13 09:56:21 -07:00
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-04-27 10:37:14 -04:00
pnode.h
…
posix_acl.c
vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK
2020-06-08 11:04:19 -07:00
proc_namespace.c
Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-06-04 13:54:34 -07:00
read_write.c
initrd: switch initrd loading to struct file based APIs
2020-07-30 08:22:47 +02:00
readdir.c
fs: remove ksys_getdents64
2020-07-31 08:16:00 +02:00
select.c
pselect6() and friends: take handling the combined 6th/7th args into helper
2020-05-29 19:10:42 -04:00
seq_file.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
signalfd.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
splice.c
Notifications over pipes + Keyring notifications
2020-06-13 09:56:21 -07:00
stack.c
…
stat.c
New code for 5.8:
2020-06-02 19:45:12 -07:00
statfs.c
…
super.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:09:11 -07:00
sync.c
overlayfs update for 5.8
2020-06-09 15:40:50 -07:00
timerfd.c
…
userfaultfd.c
A set of locking fixes and updates:
2020-08-10 19:07:44 -07:00
utimes.c
fs: expose utimes_common
2020-07-31 08:16:01 +02:00
xattr.c
xattr: add a function to check if a namespace is supported
2020-07-13 17:27:03 -04:00