Jon Derrick 9611051641 ext4: check superblock mapped prior to committing ... commit a17712c8e4be4fa5404d20e9cd3b2b21eae7bc56 upstream. This patch attempts to close a hole leading to a BUG seen with hot removals during writes [1]. A block device (NVME namespace in this test case) is formatted to EXT4 without partitions. It's mounted and write I/O is run to a file, then the device is hot removed from the slot. The superblock attempts to be written to the drive which is no longer present. The typical chain of events leading to the BUG: ext4_commit_super() __sync_dirty_buffer() submit_bh() submit_bh_wbc() BUG_ON(!buffer_mapped(bh)); This fix checks for the superblock's buffer head being mapped prior to syncing. [1] https://www.spinics.net/lists/linux-ext4/msg56527.html Signed-off-by: Jon Derrick <jonathan.derrick@intel.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-07-11 16:03:49 +02:00
..
acl.c	ext4: Don't clear SGID when inheriting ACLs	2017-10-12 11:27:35 +02:00
acl.h	ext2/3/4: use generic posix ACL infrastructure	2014-01-25 23:58:19 -05:00
balloc.c	ext4: only look at the bg_flags field if it is valid	2018-07-11 16:03:48 +02:00
bitmap.c	ext4: remove unused header files	2015-04-02 23:47:42 -04:00
block_validity.c	ext4: call out CRC and corruption errors with specific error codes	2015-10-17 16:16:04 -04:00
crypto.c	ext4 crypto: don't let data integrity writebacks fail with ENOMEM	2017-05-25 14:30:11 +02:00
crypto_fname.c	fscrypt: avoid collisions when presenting long encrypted filenames	2017-05-25 14:30:11 +02:00
crypto_key.c	fscrypt: lock mutex before checking for bounce page pool	2017-11-30 08:37:25 +00:00
crypto_policy.c	fscrypt: fix context consistency check when key(s) unavailable	2017-05-25 14:30:11 +02:00
dir.c	ext4 crypto: revalidate dentry after adding or removing the key	2017-05-08 07:46:02 +02:00
ext4.h	ext4: add more inode number paranoia checks	2018-07-11 16:03:49 +02:00
ext4_crypto.h	fscrypt: remove broken support for detecting keyring key revocation	2017-03-31 09:49:54 +02:00
ext4_extents.h	ext4: verify the depth of extent tree in ext4_find_extent()	2018-07-11 16:03:48 +02:00
ext4_jbd2.c	ext4: fix potential use after free in __ext4_journal_stop	2015-10-17 22:57:06 -04:00
ext4_jbd2.h	ext4: do not perform data journaling when data is encrypted	2017-01-06 11:16:13 +01:00
extents.c	ext4: verify the depth of extent tree in ext4_find_extent()	2018-07-11 16:03:48 +02:00
extents_status.c	ext4: move procfs registration code to fs/ext4/sysfs.c	2015-09-23 12:46:17 -04:00
extents_status.h	ext4: move procfs registration code to fs/ext4/sysfs.c	2015-09-23 12:46:17 -04:00
file.c	ext4: fix off-by-one on max nr_pages in ext4_find_unwritten_pgoff()	2018-04-13 19:50:11 +02:00
fsync.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-04-26 17:22:07 -07:00
hash.c	ext4: remove unused header files	2015-04-02 23:47:42 -04:00
ialloc.c	ext4: only look at the bg_flags field if it is valid	2018-07-11 16:03:48 +02:00
indirect.c	ext4: clean up feature test macros with predicate functions	2015-10-17 16:18:43 -04:00
inline.c	ext4: clear i_data in ext4_inode_info when removing inline data	2018-07-11 16:03:49 +02:00
inode.c	ext4: add more inode number paranoia checks	2018-07-11 16:03:49 +02:00
ioctl.c	ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY	2017-05-08 07:46:02 +02:00
Kconfig	ext4: Update EXT4_USE_FOR_EXT2 description	2015-09-24 13:27:47 +02:00
Makefile	ext4: move sysfs code from super.c to fs/ext4/sysfs.c	2015-09-23 12:44:17 -04:00
mballoc.c	ext4: only look at the bg_flags field if it is valid	2018-07-11 16:03:48 +02:00
mballoc.h	ext4: remove unused ac_ex_scanned	2014-02-20 13:32:10 -05:00
migrate.c	ext4: clean up feature test macros with predicate functions	2015-10-17 16:18:43 -04:00
mmp.c	ext4: call out CRC and corruption errors with specific error codes	2015-10-17 16:16:04 -04:00
move_extent.c	fs: add i_blocksize()	2017-06-14 13:16:24 +02:00
namei.c	do d_instantiate/unlock_new_inode combinations safely	2018-05-30 07:48:52 +02:00
page-io.c	ext4 crypto: fix some error handling	2017-05-25 14:30:11 +02:00
readpage.c	ext4 crypto: don't let data integrity writebacks fail with ENOMEM	2017-05-25 14:30:11 +02:00
resize.c	ext4: fix fencepost error in check for inode count overflow during resize	2018-07-03 11:21:25 +02:00
super.c	ext4: check superblock mapped prior to committing	2018-07-11 16:03:49 +02:00
symlink.c	don't put symlink bodies in pagecache into highmem	2018-02-16 20:09:38 +01:00
sysfs.c	ext4: check return value of kstrtoull correctly in reserved_clusters_store	2017-07-15 11:57:50 +02:00
truncate.h	ext4: fix races between page faults and hole punching	2016-05-04 14:48:53 -07:00
xattr.c	ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea()	2018-04-24 09:32:10 +02:00
xattr.h	ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea()	2018-04-24 09:32:10 +02:00
xattr_security.c	xattr handlers: Pass handler to operations instead of flags	2015-11-13 20:34:32 -05:00
xattr_trusted.c	xattr handlers: Pass handler to operations instead of flags	2015-11-13 20:34:32 -05:00
xattr_user.c	xattr handlers: Pass handler to operations instead of flags	2015-11-13 20:34:32 -05:00