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1a88b5364b535edaa321d70a566e358390ff0872
linux/fs
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Al Viro 1a88b5364b Fix incomplete __mntput locking 
Getting this wrong caused

	WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2()

due to optimistically checking cpu_writer->mnt outside the spinlock.

Here's what we really want:
 * we know that nobody will set cpu_writer->mnt to mnt from now on
 * all changes to that sucker are done under cpu_writer->lock
 * we want the laziest equivalent of
	spin_lock(&cpu_writer->lock);
	if (likely(cpu_writer->mnt != mnt)) {
		spin_unlock(&cpu_writer->lock);
		continue;
	}
	/* do stuff */
  that would make sure we won't miss earlier setting of ->mnt done by
  another CPU.

Anyway, for now we just move the spin_lock() earlier and move the test
into the properly locked region.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reported-and-tested-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-17 14:02:08 -08:00
..
9p
fs/Kconfig: move 9p out
2009-01-22 13:16:01 +03:00
adfs
fs/Kconfig: move adfs out
2009-01-22 13:15:56 +03:00
affs
fs/Kconfig: move affs out
2009-01-22 13:15:56 +03:00
afs
fs/Kconfig: move afs out
2009-01-22 13:16:01 +03:00
autofs
fs/Kconfig: move autofs, autofs4 out
2009-01-22 13:15:54 +03:00
autofs4
fs/Kconfig: move autofs, autofs4 out
2009-01-22 13:15:54 +03:00
befs
fs/Kconfig: move befs out
2009-01-22 13:15:57 +03:00
bfs
fs/Kconfig: move bfs out
2009-01-22 13:15:57 +03:00
btrfs
Btrfs: don't use spin_is_contended
2009-02-09 16:22:03 -05:00
cifs
cifs: make sure we allocate enough storage for socket address
2009-01-29 03:32:13 +00:00
coda
fs/Kconfig: move coda out
2009-01-22 13:16:01 +03:00
configfs
Revert "configfs: Silence lockdep on mkdir(), rmdir() and configfs_depend_item()"
2009-02-04 09:46:25 -08:00
cramfs
fs/Kconfig: move cramfs out
2009-01-22 13:15:58 +03:00
debugfs
debugfs: add helpers for exporting a size_t simple value
2009-01-07 10:00:16 -08:00
devpts
zero i_uid/i_gid on inode allocation
2009-01-05 11:54:28 -05:00
dlm
dlm: initialize file_lock struct in GETLK before copying conflicting lock
2009-01-21 15:28:45 -06:00
ecryptfs
eCryptfs: Regression in unencrypted filename symlinks
2009-02-06 18:36:40 -08:00
efs
fs/Kconfig: move efs out
2009-01-22 13:15:57 +03:00
exportfs
Merge branch 'next' into for-linus
2008-12-25 11:40:09 +11:00
ext2
ext2/xip: refuse to change xip flag during remount with busy inodes
2009-02-11 14:25:36 -08:00
ext3
ext3: revert "ext3: wait on all pending commits in ext3_sync_fs"
2009-02-11 14:25:35 -08:00
ext4
ext4: Remove bogus BUG() check in ext4_bmap()
2009-01-30 00:00:24 -05:00
fat
fs/Kconfig: move fat out
2009-01-22 13:15:55 +03:00
freevxfs
fs/Kconfig: move vxfs out
2009-01-22 13:15:58 +03:00
fuse
Merge branch 'Kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/misc
2009-01-26 10:08:50 -08:00
gfs2
filesystem freeze: add error handling of write_super_lockfs/unlockfs
2009-01-09 16:54:42 -08:00
hfs
fs/Kconfig: move hfs, hfsplus out
2009-01-22 13:15:57 +03:00
hfsplus
fs/Kconfig: move hfs, hfsplus out
2009-01-22 13:15:57 +03:00
hostfs
fs: symlink write_begin allocation context fix
2009-01-04 13:33:20 -08:00
hpfs
fs/Kconfig: move hpfs out
2009-01-22 13:15:59 +03:00
hppfs
CRED: Use creds in file structs
2008-11-14 10:39:25 +11:00
hugetlbfs
Do not account for the address space used by hugetlbfs using VM_ACCOUNT
2009-02-10 10:48:42 -08:00
isofs
fs/Kconfig: move iso9660, udf out
2009-01-22 13:15:55 +03:00
jbd
jbd: fix return value of journal_start_commit()
2009-02-11 14:25:35 -08:00
jbd2
ext4: fix wrong use of do_div
2009-01-11 22:34:01 -05:00
jffs2
[JFFS2] remove junk prototypes
2009-01-09 21:05:21 +00:00
jfs
fs/Kconfig: move jfs out
2009-01-22 13:15:54 +03:00
lockd
lockd: fix regression in lockd's handling of blocked locks
2009-02-09 13:19:46 -05:00
minix
fs/Kconfig: move minix out
2009-01-22 13:15:58 +03:00
ncpfs
fs/Kconfig: move the rest of ncpfs out
2009-01-22 13:16:01 +03:00
nfs
fs/Kconfig: move nfs out
2009-01-22 13:16:00 +03:00
nfs_common
SUNRPC: nfsacl_encode/nfsacl_decode should be exported as GPL-only
2008-12-23 15:21:32 -05:00
nfsd
nfsd: only set file_lock.fl_lmops in nfsd4_lockt if a stateowner is found
2009-01-27 17:26:59 -05:00
nls
remove CONFIG_KMOD from fs
2008-10-17 02:38:36 +11:00
notify
inotify: clean up inotify_read and fix locking problems
2009-01-26 10:08:05 -08:00
ntfs
fs/Kconfig: move ntfs out
2009-01-22 13:15:55 +03:00
ocfs2
ocfs2: add quota call to ocfs2_remove_btree_range()
2009-02-02 14:20:20 -08:00
omfs
fs/Kconfig: move omfs out
2009-01-22 13:15:58 +03:00
openpromfs
zero i_uid/i_gid on inode allocation
2009-01-05 11:54:28 -05:00
partitions
block: fix bug in ptbl lookup cache
2009-01-09 21:46:13 +01:00
proc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu
2009-01-09 14:00:58 -08:00
qnx4
fs/Kconfig: move qnx4 out
2009-01-22 13:15:59 +03:00
ramfs
NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()
2009-01-08 12:04:46 +00:00
reiserfs
fs/Kconfig: move reiserfs out
2009-01-22 13:15:53 +03:00
romfs
fs/Kconfig: move romfs out
2009-01-22 13:15:59 +03:00
smbfs
fs/Kconfig: move smbfs out
2009-01-22 13:16:01 +03:00
squashfs
fs/Kconfig: move squashfs out
2009-01-22 13:15:58 +03:00
sysfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
2009-01-26 10:40:28 -08:00
sysv
fs/Kconfig: move sysv out
2009-01-22 13:15:59 +03:00
ubifs
UBIFS: remove fast unmounting
2009-01-29 16:34:30 +02:00
udf
fs/Kconfig: move iso9660, udf out
2009-01-22 13:15:55 +03:00
ufs
fs/Kconfig: move ufs out
2009-01-22 13:16:00 +03:00
xfs
[XFS] Warn on transaction in flight on read-only remount
2009-02-03 11:04:54 -06:00
aio.c
[CVE-2009-0029] System call wrappers part 16
2009-01-14 14:15:25 +01:00
anon_inodes.c
anon_inodes: use fops->owner for module refcount
2008-12-31 16:55:44 +02:00
attr.c
CRED: Wrap task credential accesses in the filesystem subsystem
2008-11-14 10:39:05 +11:00
bad_inode.c
kill ->dir_notify()
2008-12-31 18:07:43 -05:00
binfmt_aout.c
sanitize ifdefs in binfmt_aout
2009-01-03 11:45:54 -08:00
binfmt_elf_fdpic.c
FDPIC: Don't attempt to expand the userspace stack to fill the space allocated
2009-01-08 12:04:47 +00:00
binfmt_elf.c
elf core dump: fix get_user use
2009-02-06 17:34:07 -08:00
binfmt_em86.c
Allow recursion in binfmt_script and binfmt_misc
2008-10-16 11:21:38 -07:00
binfmt_flat.c
FLAT: Don't attempt to expand the userspace stack to fill the space allocated
2009-01-08 12:04:47 +00:00
binfmt_misc.c
fs/binfmt_misc.c: add terminating newline to /proc/sys/fs/binfmt_misc/status
2009-01-06 15:59:19 -08:00
binfmt_script.c
Allow recursion in binfmt_script and binfmt_misc
2008-10-16 11:21:38 -07:00
binfmt_som.c
CRED: Make execve() take advantage of copy-on-write credentials
2008-11-14 10:39:24 +11:00
bio-integrity.c
block: Remove obsolete BUG_ON
2009-01-30 12:34:36 +01:00
bio.c
[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITE
2009-01-02 11:10:35 -06:00
block_dev.c
filesystem freeze: implement generic freeze feature
2009-01-09 16:54:42 -08:00
buffer.c
vfs: Don't call attach_nobh_buffers() with an empty list
2009-02-06 13:34:22 -08:00
char_dev.c
fs: fix name overwrite in __register_chrdev_region()
2009-01-06 15:59:13 -08:00
compat_binfmt_elf.c
x86: compat_binfmt_elf
2008-01-30 13:31:46 +01:00
compat_ioctl.c
braino in sg_ioctl_trans()
2009-02-05 16:35:52 -08:00
compat.c
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
dcache.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
dcookies.c
[CVE-2009-0029] System call wrapper special cases
2009-01-14 14:15:18 +01:00
direct-io.c
fs: truncate blocks outside i_size after O_DIRECT write error
2009-01-06 15:59:06 -08:00
dquot.c
quota: Improve locking
2009-01-16 18:02:10 +01:00
drop_caches.c
vfs: skip inodes without pages to free in drop_pagecache_sb()
2008-04-29 08:06:05 -07:00
eventfd.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
eventpoll.c
epoll: drop max_user_instances and rely only on max_user_watches
2009-01-29 18:04:45 -08:00
exec.c
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
fcntl.c
[CVE-2009-0029] System call wrappers part 15
2009-01-14 14:15:24 +01:00
fifo.c
[PATCH] introduce fmode_t, do annotations
2008-10-21 07:47:06 -04:00
file_table.c
filp_cachep can be static in fs/file_table.c
2008-12-31 18:07:42 -05:00
file.c
[PATCH] merge locate_fd() and get_unused_fd()
2008-08-01 11:25:23 -04:00
filesystems.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
fs-writeback.c
fs: sys_sync fix
2009-01-06 15:59:09 -08:00
generic_acl.c
Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check
2007-07-17 12:00:03 -07:00
inode.c
partial revert of asynchronous inode delete
2009-01-09 13:15:49 -08:00
internal.h
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
ioctl.c
[CVE-2009-0029] System call wrappers part 15
2009-01-14 14:15:24 +01:00
ioprio.c
[CVE-2009-0029] System call wrappers part 28
2009-01-14 14:15:30 +01:00
Kconfig
fs/Kconfig: move 9p out
2009-01-22 13:16:01 +03:00
Kconfig.binfmt
CORE_DUMP_DEFAULT_ELF_HEADERS depends on ELF_CORE
2009-01-09 16:54:41 -08:00
libfs.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-01-05 18:32:06 -08:00
locks.c
[CVE-2009-0029] System call wrappers part 16
2009-01-14 14:15:25 +01:00
Makefile
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
2009-01-09 15:18:49 -08:00
mbcache.c
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
mpage.c
do_mpage_readpage(): remove useless clear_buffer_mapped() call
2009-01-06 15:59:01 -08:00
namei.c
[CVE-2009-0029] System call wrappers part 29
2009-01-14 14:15:30 +01:00
namespace.c
Fix incomplete __mntput locking
2009-02-17 14:02:08 -08:00
nfsctl.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
no-block.c
…
open.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
pipe.c
[CVE-2009-0029] System call wrappers part 33
2009-01-14 14:15:32 +01:00
pnode.c
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
pnode.h
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
posix_acl.c
CRED: Wrap task credential accesses in the filesystem subsystem
2008-11-14 10:39:05 +11:00
quota_tree.c
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
quota_tree.h
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
quota_v1.c
quota: Move quotaio_v[12].h from include/linux/ to fs/
2009-01-05 08:36:58 -08:00
quota_v2.c
quota: Convert union in mem_dqinfo to a pointer
2009-01-05 08:40:21 -08:00
quota.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
quotaio_v1.h
quota: Move quotaio_v[12].h from include/linux/ to fs/
2009-01-05 08:36:58 -08:00
quotaio_v2.h
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
read_write.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
read_write.h
…
readdir.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
select.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
seq_file.c
seq_file: fix big-enough lseek() + read()
2009-02-05 14:18:14 -08:00
signalfd.c
[CVE-2009-0029] System call wrappers part 31
2009-01-14 14:15:31 +01:00
splice.c
[CVE-2009-0029] System call wrappers part 31
2009-01-14 14:15:31 +01:00
stack.c
…
stat.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
super.c
async: Rename _special -> _domain for clarity.
2009-02-08 09:56:11 -08:00
sync.c
[CVE-2009-0029] System call wrappers part 09
2009-01-14 14:15:21 +01:00
timerfd.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
utimes.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
xattr_acl.c
…
xattr.c
[CVE-2009-0029] System call wrappers part 13
2009-01-14 14:15:23 +01:00