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Tejun Heo dd14cbc994 sysfs: fix race condition around sd->s_dentry, take#2 
Allowing attribute and symlink dentries to be reclaimed means
sd->s_dentry can change dynamically.  However, updates to the field
are unsynchronized leading to race conditions.  This patch adds
sysfs_lock and use it to synchronize updates to sd->s_dentry.

Due to the locking around ->d_iput, the check in sysfs_drop_dentry()
is complex.  sysfs_lock only protect sd->s_dentry pointer itself.  The
validity of the dentry is protected by dcache_lock, so whether dentry
is alive or not can only be tested while holding both locks.

This is minimal backport of sysfs_drop_dentry() rewrite in devel
branch.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 		2007-06-12 16:08:47 -07:00
..
9p Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
adfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
affs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
afs afs: needs sched.h 2007-05-31 07:58:14 -07:00
autofs Replace pid_t in autofs with struct pid reference 2007-05-11 08:29:36 -07:00
autofs4 Fix some coding-style errors in autofs 2007-05-11 08:29:36 -07:00
befs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
bfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
cifs [CIFS] CIFS should honour umask 2007-06-08 14:55:14 +00:00
coda Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
configfs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
cramfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
debugfs remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
devpts devpts: add fsnotify create event 2007-05-08 11:14:59 -07:00
dlm Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw 2007-05-07 12:26:27 -07:00
ecryptfs eCryptfs: delay writing 0's after llseek until write 2007-05-23 20:14:15 -07:00
efs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
exportfs header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ext2 Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
ext3 Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
ext4 When ext4_ext_insert_extent() fails to insert new blocks 2007-05-31 16:20:15 -04:00
fat Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
freevxfs freevxfs: possible null pointer dereference fix 2007-05-08 11:14:59 -07:00
fuse fuse: delete inode on drop 2007-05-23 20:14:13 -07:00
gfs2 Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
hfs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
hfsplus Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
hostfs uml: hostfs style fixes 2007-05-08 11:14:57 -07:00
hpfs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
hppfs
…
hugetlbfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
isofs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
jbd fix file specification in comments 2007-05-09 08:58:16 +02:00
jbd2 fix file specification in comments 2007-05-09 08:58:16 +02:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2007-06-04 17:54:09 -07:00
jfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
lockd NLM: Fix sparse warnings 2007-05-14 19:33:46 -04:00
minix Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
msdos
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ncpfs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nfs NFS: Fix a refcount leakage in O_DIRECT 2007-05-30 16:26:01 -04:00
nfs_common
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nfsd Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nls
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ntfs ntfs_init_locked_inode(): fix array indexing 2007-05-31 07:58:13 -07:00
ocfs2 ocfs2: Fix invalid assertion during write on 64k pages 2007-06-06 16:42:03 -07:00
openpromfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
partitions partitions/LDM: build fix 2007-05-21 21:38:17 -07:00
proc Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
qnx4 Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
ramfs RAMFS NOMMU: missed POSIX UID/GID inode attribute checking 2007-06-07 17:11:13 -07:00
reiserfs Missing 'const' from reiserfs MIN_KEY declaration. 2007-05-23 20:14:13 -07:00
romfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
smbfs Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
sysfs sysfs: fix race condition around sd->s_dentry, take#2 2007-06-12 16:08:47 -07:00
sysv Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
udf parse errors in ifdefs 2007-06-01 08:18:28 -07:00
ufs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
vfat
…
xfs [XFS] Write at EOF may not update filesize correctly. 2007-05-29 18:15:17 +10:00
Kconfig Remove obsolete fat_cvf help text 2007-05-09 08:58:15 +02:00
Kconfig.binfmt fs: Kill sh dependency for binfmt_flat. 2007-05-21 14:34:00 +09:00
Makefile signal/timer/event: eventfd core 2007-05-11 08:29:36 -07:00
aio.c signal/timer/event: KAIO eventfd support example 2007-05-11 08:29:37 -07:00
anon_inodes.c signal/timer/event fds: anonymous inode source 2007-05-11 08:29:36 -07:00
attr.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
bad_inode.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
binfmt_aout.c
…
binfmt_elf.c Invalid return value of execve() resulting in oopses 2007-05-08 11:15:15 -07:00
binfmt_elf_fdpic.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
binfmt_em86.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
binfmt_flat.c nommu: report correct errno in message 2007-06-08 17:23:32 -07:00
binfmt_misc.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
binfmt_script.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
binfmt_som.c
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bio.c KMEM_CACHE(): simplify slab cache creation 2007-05-07 12:12:55 -07:00
block_dev.c Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
buffer.c Fix "fs: convert core functions to zero_user_page" 2007-05-21 09:15:32 -07:00
char_dev.c [PATCH] remove protection of LANANA-reserved majors 2007-04-04 21:12:47 -07:00
compat.c optimize compat_core_sys_select() by a using stack space for small fd sets 2007-05-23 20:14:12 -07:00
compat_ioctl.c fix compat console unimap regression 2007-05-25 17:37:46 -07:00
dcache.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
dcookies.c
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direct-io.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2007-05-09 12:54:17 -07:00
dnotify.c
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dquot.c circular locking dependency found in QUOTA OFF 2007-05-17 05:23:05 -07:00
drop_caches.c
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eventfd.c eventfd use waitqueue lock ... 2007-05-18 13:09:34 -07:00
eventpoll.c epoll: move kfree inside ep_free 2007-05-15 08:54:00 -07:00
exec.c uselib: add missing MNT_NOEXEC check 2007-05-23 20:14:13 -07:00
fcntl.c
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fifo.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
file.c
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file_table.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
filesystems.c add filesystem subtype support 2007-05-08 11:15:01 -07:00
fs-writeback.c
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generic_acl.c
…
inode.c Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
inotify.c Introduce a handy list_first_entry macro 2007-05-08 11:15:11 -07:00
inotify_user.c
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internal.h cleanup compat ioctl handling 2007-05-08 11:15:09 -07:00
ioctl.c vanishing ioctl handler debugging 2007-06-04 13:25:10 -07:00
ioprio.c
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libfs.c fs/libfs.c: >80 columns line break fix 2007-05-09 06:44:57 +02:00
locks.c Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
mbcache.c
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mpage.c consolidate generic_writepages and mpage_writepages 2007-05-11 08:29:35 -07:00
namei.c [PATCH] complete message queue auditing 2007-05-11 05:38:26 -04:00
namespace.c check privileges before setting mount propagation 2007-05-08 11:15:12 -07:00
nfsctl.c
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no-block.c
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open.c Remove suid/sgid bits on [f]truncate() 2007-05-08 20:10:00 -07:00
pipe.c VFS: delay the dentry name generation on sockets and pipes 2007-05-08 11:15:03 -07:00
pnode.c Introduce a handy list_first_entry macro 2007-05-08 11:15:11 -07:00
pnode.h
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posix_acl.c
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quota.c circular locking dependency found in QUOTA OFF 2007-05-17 05:23:05 -07:00
quota_v1.c
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quota_v2.c
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read_write.c use use SEEK_MAX to validate user lseek arguments 2007-05-08 11:14:59 -07:00
read_write.h
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readdir.c ROUND_UP macro cleanup in fs/(select|compat|readdir).c 2007-05-08 11:15:09 -07:00
select.c Style fix in fs/select.c 2007-05-09 07:10:02 +02:00
seq_file.c
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signalfd.c signalfd: retrieve multiple signals with one read() call 2007-05-23 20:14:14 -07:00
splice.c splice: __generic_file_splice_read: fix read/truncate race 2007-06-08 08:34:11 +02:00
stack.c [PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied 2007-02-19 14:21:50 -08:00
stat.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
super.c add filesystem subtype support 2007-05-08 11:15:01 -07:00
sync.c Remove do_sync_file_range() 2007-05-08 11:15:04 -07:00
timerfd.c timerfd use waitqueue lock ... 2007-05-18 13:09:34 -07:00
utimes.c utimensat implementation 2007-05-08 11:15:18 -07:00
xattr.c [PATCH] audit inode for all xattr syscalls 2007-05-11 05:38:26 -04:00
xattr_acl.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00