Filipe Manana f55985f4dd Btrfs: scrub, fix sleep in atomic context ... My previous patch "Btrfs: fix scrub race leading to use-after-free" introduced the possibility to sleep in an atomic context, which happens when the scrub_lock mutex is held at the time scrub_pending_bio_dec() is called - this function can be called under an atomic context. Chris ran into this in a debug kernel which gave the following trace: [ 1928.950319] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:621 [ 1928.967334] in_atomic(): 1, irqs_disabled(): 0, pid: 149670, name: fsstress [ 1928.981324] INFO: lockdep is turned off. [ 1928.989244] CPU: 24 PID: 149670 Comm: fsstress Tainted: G W 3.19.0-rc7-mason+ #41 [ 1929.006418] Hardware name: ZTSYSTEMS Echo Ridge T4 /A9DRPF-10D, BIOS 1.07 05/10/2012 [ 1929.022207] ffffffff81a22cf8 ffff881076e03b78 ffffffff816b8dd9 ffff881076e03b78 [ 1929.037267] ffff880d8e828710 ffff881076e03ba8 ffffffff810856c4 ffff881076e03bc8 [ 1929.052315] 0000000000000000 000000000000026d ffffffff81a22cf8 ffff881076e03bd8 [ 1929.067381] Call Trace: [ 1929.072344] <IRQ> [<ffffffff816b8dd9>] dump_stack+0x4f/0x6e [ 1929.083968] [<ffffffff810856c4>] ___might_sleep+0x174/0x230 [ 1929.095352] [<ffffffff810857d2>] __might_sleep+0x52/0x90 [ 1929.106223] [<ffffffff816bb68f>] mutex_lock_nested+0x2f/0x3b0 [ 1929.117951] [<ffffffff810ab37d>] ? trace_hardirqs_on+0xd/0x10 [ 1929.129708] [<ffffffffa05dc838>] scrub_pending_bio_dec+0x38/0x70 [btrfs] [ 1929.143370] [<ffffffffa05dd0e0>] scrub_parity_bio_endio+0x50/0x70 [btrfs] [ 1929.157191] [<ffffffff812fa603>] bio_endio+0x53/0xa0 [ 1929.167382] [<ffffffffa05f96bc>] rbio_orig_end_io+0x7c/0xa0 [btrfs] [ 1929.180161] [<ffffffffa05f97ba>] raid_write_parity_end_io+0x5a/0x80 [btrfs] [ 1929.194318] [<ffffffff812fa603>] bio_endio+0x53/0xa0 [ 1929.204496] [<ffffffff8130401b>] blk_update_request+0x1eb/0x450 [ 1929.216569] [<ffffffff81096e58>] ? trigger_load_balance+0x78/0x500 [ 1929.229176] [<ffffffff8144c74d>] scsi_end_request+0x3d/0x1f0 [ 1929.240740] [<ffffffff8144ccac>] scsi_io_completion+0xac/0x5b0 [ 1929.252654] [<ffffffff81441c50>] scsi_finish_command+0xf0/0x150 [ 1929.264725] [<ffffffff8144d317>] scsi_softirq_done+0x147/0x170 [ 1929.276635] [<ffffffff8130ace6>] blk_done_softirq+0x86/0xa0 [ 1929.288014] [<ffffffff8105d92e>] __do_softirq+0xde/0x600 [ 1929.298885] [<ffffffff8105df6d>] irq_exit+0xbd/0xd0 (...) Fix this by using a reference count on the scrub context structure instead of locking the scrub_lock mutex. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>		2015-02-14 08:19:14 -08:00
..
9p	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
adfs	adfs: add __printf verification, fix format/argument mismatches	2014-08-08 15:57:24 -07:00
affs	fs/affs/file.c: remove obsolete pagesize check	2014-12-13 12:42:52 -08:00
afs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-12-11 14:27:06 -08:00
autofs4	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
befs	befs: remove dead code	2014-12-13 12:42:51 -08:00
bfs	fs/bfs: use bfs prefix for dump_imap	2014-08-08 15:57:24 -07:00
btrfs	Btrfs: scrub, fix sleep in atomic context	2015-02-14 08:19:14 -08:00
cachefiles	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
ceph	ceph: use %zu for len in ceph_fill_inline_data()	2015-01-08 20:36:56 +03:00
cifs	cifs: make new inode cache when file type is different	2014-12-22 14:16:21 -06:00
coda	coda_venus_readdir(): use file_inode()	2014-12-11 16:28:12 -05:00
configfs	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
cramfs	fs/cramfs/inode.c: use linux/uaccess.h	2014-08-08 15:57:25 -07:00
debugfs	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
devpts
dlm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-10 16:10:49 -08:00
ecryptfs	Fixes for filename decryption and encrypted view plus a cleanup	2014-12-19 18:15:12 -08:00
efivarfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-10 16:10:49 -08:00
efs	fs/efs/namei.c: return is not a function	2014-08-08 15:57:18 -07:00
exofs	Boaz Harrosh - Fix broken email address	2014-10-19 20:22:32 +03:00
exportfs	move d_rcu from overlapping d_child to overlapping d_alias	2014-11-03 15:20:29 -05:00
ext2	ext2: Convert to private i_dquot field	2014-11-10 10:06:10 +01:00
ext3	ext3: Convert to private i_dquot field	2014-11-10 10:06:10 +01:00
ext4	Revert a potential seek_data/hole regression which shows up when using	2015-01-06 14:05:40 -08:00
f2fs	f2fs: avoid to ra unneeded blocks in recover flow	2014-12-08 14:19:09 -08:00
fat	fat: fix data past EOF resulting from fsx testsuite	2014-12-13 12:42:51 -08:00
freevxfs
fscache	fs/fscache/object-list.c: use __seq_open_private()	2014-10-13 17:52:21 +01:00
fuse	fuse: add memory barrier to INIT	2015-01-06 10:45:35 +01:00
gfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-10 16:10:49 -08:00
hfs	fs/hfs/catalog.c: fix comparison bug in hfs_cat_keycmp	2014-12-10 17:41:16 -08:00
hfsplus	hfsplus: fix longname handling	2014-12-18 19:08:10 -08:00
hostfs	hostfs: support rename flags	2014-08-07 14:40:09 -04:00
hpfs	fs/hpfs/dnode.c: fix suspect code indent	2014-08-08 15:57:22 -07:00
hppfs	vfs: make first argument of dir_context.actor typed	2014-10-31 17:48:54 -04:00
hugetlbfs	mm: convert i_mmap_mutex to rwsem	2014-12-13 12:42:45 -08:00
isofs	isofs: Fix unchecked printing of ER records	2014-12-19 11:29:24 +01:00
jbd	jbd: Deletion of an unnecessary check before the function call "iput"	2014-11-18 10:15:29 +01:00
jbd2	Lots of bugs fixes, including Zheng and Jan's extent status shrinker	2014-12-12 09:28:03 -08:00
jffs2	jffs2: Drop bogus if in comment	2014-11-28 18:23:44 -08:00
jfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-10 16:10:49 -08:00
kernfs	kernfs: Fix kernfs_name_compare	2015-01-09 15:51:08 -08:00
lockd	LOCKD: Fix a race when initialising nlmsvc_timeout	2015-01-05 19:40:53 -08:00
logfs	fs/logfs/readwrite.c: kernel-doc warning fixes	2014-08-06 18:01:12 -07:00
minix	minix zmap block counts calculation fix	2014-08-08 15:57:20 -07:00
ncpfs	Merge branch 'akpm' (patchbomb from Andrew)	2014-12-10 18:34:42 -08:00
nfs	NFSv4: Remove incorrect check in can_open_delegated()	2015-01-05 19:40:54 -08:00
nfs_common	lockd: move lockd's grace period handling into its own module	2014-09-17 16:33:11 -04:00
nfsd	nfsd: fix fi_delegees leak when fi_had_conflict returns true	2015-01-07 13:38:21 -05:00
nilfs2	nilfs2: fix the nilfs_iget() vs. nilfs_new_inode() races	2014-12-10 17:41:16 -08:00
nls
notify	sched, fanotify: Deal with nested sleeps	2015-01-09 11:18:12 +01:00
ntfs	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
ocfs2	ocfs2: fix the wrong directory passed to ocfs2_lookup_ino_from_name() when link file	2015-01-08 15:10:51 -08:00
omfs	FS/OMFS: block number sanity check during fill_super operation	2014-10-14 02:18:22 +02:00
openpromfs
overlayfs	Merge branch 'iov_iter' into for-next	2014-12-08 20:39:29 -05:00
proc	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-12-19 13:26:08 -08:00
pstore	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00
qnx4
qnx6	fs/qnx6: update debugging to current functions	2014-08-08 15:57:26 -07:00
quota	vfs: Remove i_dquot field from inode	2014-11-10 10:06:18 +01:00
ramfs	fs/ramfs/file-nommu.c: replace count*size kzalloc by kcalloc	2014-08-08 15:57:18 -07:00
reiserfs	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2014-12-16 15:46:01 -08:00
romfs	fs/romfs/super.c: add blank line after declarations	2014-08-08 15:57:25 -07:00
squashfs	Squashfs: Add LZ4 compression configuration option	2014-11-27 18:48:44 +00:00
sysfs	sysfs/kernfs: make read requests on pre-alloc files use the buffer.	2014-11-07 10:54:38 -08:00
sysv
ubifs	UBIFS: fix a couple bugs in UBIFS xattr length calculation	2014-11-07 12:32:22 +02:00
udf	udf: Reduce repeated dereferences	2014-12-21 22:42:37 +01:00
ufs	fs/ufs/balloc.c: remove unused variable	2014-10-14 02:18:20 +02:00
xfs	xfs: update for 3.19-rc1	2014-12-12 09:48:17 -08:00
aio.c	aio: Skip timer for io_getevents if timeout=0	2014-12-13 17:50:20 -05:00
anon_inodes.c
attr.c
bad_inode.c	bad_inode: add ->rename2()	2014-08-07 14:40:09 -04:00
binfmt_aout.c	assorted conversions to %p[dD]	2014-11-19 13:01:20 -05:00
binfmt_elf.c	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2014-12-11 17:56:37 -08:00
binfmt_elf_fdpic.c	handle suicide on late failure exits in execve() in search_binary_handler()	2014-10-09 02:39:00 -04:00
binfmt_em86.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
binfmt_flat.c
binfmt_misc.c	unfuck binfmt_misc.c (broken by commit e6084d4)	2014-12-17 08:27:14 -05:00
binfmt_script.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
binfmt_som.c
block_dev.c	fs: add freeze_super/thaw_super fs hooks	2014-11-17 10:35:17 +00:00
buffer.c	fs: clarify rate limit suppressed buffer I/O errors	2014-10-21 13:55:11 -06:00
char_dev.c	fs/char_dev.c: remove pointless assignment from __register_chrdev_region()	2014-12-10 17:41:04 -08:00
compat.c	vfs: make first argument of dir_context.actor typed	2014-10-31 17:48:54 -04:00
compat_binfmt_elf.c
compat_ioctl.c
coredump.c	coredump: add %i/%I in core_pattern to report the tid of the crashed thread	2014-10-14 02:18:21 +02:00
dcache.c	Merge branch 'iov_iter' into for-next	2014-12-08 20:39:29 -05:00
dcookies.c
direct-io.c	fuse: honour max_read and max_write in direct_io mode	2014-09-26 21:16:51 -04:00
drop_caches.c	mm: vmscan: invoke slab shrinkers from shrink_zone()	2014-12-13 12:42:48 -08:00
eventfd.c	fs: Convert show_fdinfo functions to void	2014-11-05 14:13:23 -05:00
eventpoll.c	fs: Convert show_fdinfo functions to void	2014-11-05 14:13:23 -05:00
exec.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
fcntl.c	vfs: renumber FMODE_NONOTIFY and add to uniqueness check	2015-01-08 15:10:52 -08:00
fhandle.c
file.c	fs/file.c: replace get_unused_fd() with get_unused_fd_flags(0)	2014-12-10 17:41:10 -08:00
file_table.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-10-13 11:28:42 +02:00
filesystems.c
fs-writeback.c	writeback: fix a subtle race condition in I_DIRTY clearing	2014-11-04 10:42:23 -07:00
fs_pin.c	make fs/{namespace,super}.c forget about acct.h	2014-08-07 14:40:09 -04:00
fs_struct.c
inode.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
internal.h	take the targets of /proc/*/ns/* symlinks to separate fs	2014-12-10 21:30:20 -05:00
ioctl.c	Merge branch 'for-3.19' of git://linux-nfs.org/~bfields/linux	2014-12-16 15:25:31 -08:00
Kconfig	overlay filesystem	2014-10-24 00:14:38 +02:00
Kconfig.binfmt	binfmt_elf: allow arch code to examine PT_LOPROC ... PT_HIPROC headers	2014-11-24 07:45:02 +01:00
libfs.c	move d_rcu from overlapping d_child to overlapping d_alias	2014-11-03 15:20:29 -05:00
locks.c	locks: fix NULL-deref in generic_delete_lease	2015-01-13 07:00:55 -05:00
Makefile	Merge branch 'nsfs' into for-next	2014-12-10 21:31:59 -05:00
mbcache.c
mount.h	common object embedded into various struct ....ns	2014-12-04 14:31:00 -05:00
mpage.c	vfs: guard end of device for mpage interface	2014-10-09 22:25:53 -04:00
namei.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
namespace.c	mnt: Fix a memory stomp in umount	2014-12-18 11:22:02 -08:00
no-block.c
nsfs.c	take the targets of /proc/*/ns/* symlinks to separate fs	2014-12-10 21:30:20 -05:00
open.c	Merge branch 'for-3.19' of git://linux-nfs.org/~bfields/linux	2014-12-16 15:25:31 -08:00
pipe.c
pnode.c	mnt: Move the clear of MNT_LOCKED from copy_tree to it's callers.	2014-12-02 10:46:50 -06:00
pnode.h
posix_acl.c
proc_namespace.c	vfs: make mounts and mountstats honor root dir like mountinfo does	2014-12-17 08:27:15 -05:00
read_write.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2014-12-14 20:36:37 -08:00
readdir.c	vfs: make first argument of dir_context.actor typed	2014-10-31 17:48:54 -04:00
select.c
seq_file.c	fs, seq_file: fallback to vmalloc instead of oom kill processes	2014-12-13 12:42:49 -08:00
signalfd.c	fs: Convert show_fdinfo functions to void	2014-11-05 14:13:23 -05:00
splice.c	vfs: export do_splice_direct() to modules	2014-10-24 00:14:35 +02:00
stack.c	fs: fix comment for 'CONFIG_LBADF'	2014-08-26 09:35:56 +02:00
stat.c
statfs.c
super.c	vfs: Remove i_dquot field from inode	2014-11-10 10:06:18 +01:00
sync.c	kill f_dentry uses	2014-11-19 13:01:25 -05:00
timerfd.c	fs: Convert show_fdinfo functions to void	2014-11-05 14:13:23 -05:00
utimes.c
xattr.c	new helper: audit_file()	2014-11-19 13:01:26 -05:00