Revision 5c81a4197de38411fe3e27f8593fff73a5d6b868 authored by Arjan van de Ven on 03 July 2006, 07:25:20 UTC, committed by Linus Torvalds on 03 July 2006, 22:27:08 UTC
The quota code plays interesting games with the lock ordering; to quote Jan: | i_mutex of inode containing quota file is acquired after all other | quota locks. i_mutex of all other inodes is acquired before quota | locks. Quota code makes sure (by resetting inode operations and | setting special flag on inode) that noone tries to enter quota code | while holding i_mutex on a quota file... The good news is that all of this special case i_mutex grabbing happens in the (per filesystem) low level quota write function. For this special case we need a new I_MUTEX_* nesting level, since this just entirely outside any of the regular VFS locking rules for i_mutex. I trust Jan on his blue eyes that this is not ever going to deadlock; and based on that the patch below is what it takes to inform lockdep of these very interesting new locking rules. The new locking rule for the I_MUTEX_QUOTA nesting level is that this is the deepest possible level of nesting for i_mutex, and that this only should be used in quota write (and possibly read) function of filesystems. This makes the lock ordering of the I_MUTEX_* levels: I_MUTEX_PARENT -> I_MUTEX_CHILD -> I_MUTEX_NORMAL -> I_MUTEX_QUOTA Has no effect on non-lockdep kernels. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Jan Kara <jack@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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File | Mode | Size |
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9p | ||
adfs | ||
affs | ||
afs | ||
autofs | ||
autofs4 | ||
befs | ||
bfs | ||
cifs | ||
coda | ||
configfs | ||
cramfs | ||
debugfs | ||
devpts | ||
efs | ||
exportfs | ||
ext2 | ||
ext3 | ||
fat | ||
freevxfs | ||
fuse | ||
hfs | ||
hfsplus | ||
hostfs | ||
hpfs | ||
hppfs | ||
hugetlbfs | ||
isofs | ||
jbd | ||
jffs | ||
jffs2 | ||
jfs | ||
lockd | ||
minix | ||
msdos | ||
ncpfs | ||
nfs | ||
nfs_common | ||
nfsd | ||
nls | ||
ntfs | ||
ocfs2 | ||
openpromfs | ||
partitions | ||
proc | ||
qnx4 | ||
ramfs | ||
reiserfs | ||
romfs | ||
smbfs | ||
sysfs | ||
sysv | ||
udf | ||
ufs | ||
vfat | ||
xfs | ||
Kconfig | -rw-r--r-- | 69.7 KB |
Kconfig.binfmt | -rw-r--r-- | 5.3 KB |
Makefile | -rw-r--r-- | 3.3 KB |
aio.c | -rw-r--r-- | 43.8 KB |
attr.c | -rw-r--r-- | 4.2 KB |
bad_inode.c | -rw-r--r-- | 2.8 KB |
binfmt_aout.c | -rw-r--r-- | 14.8 KB |
binfmt_elf.c | -rw-r--r-- | 45.5 KB |
binfmt_elf_fdpic.c | -rw-r--r-- | 30.1 KB |
binfmt_em86.c | -rw-r--r-- | 2.8 KB |
binfmt_flat.c | -rw-r--r-- | 26.0 KB |
binfmt_misc.c | -rw-r--r-- | 15.7 KB |
binfmt_script.c | -rw-r--r-- | 2.7 KB |
binfmt_som.c | -rw-r--r-- | 7.6 KB |
bio.c | -rw-r--r-- | 30.0 KB |
block_dev.c | -rw-r--r-- | 29.3 KB |
buffer.c | -rw-r--r-- | 83.1 KB |
char_dev.c | -rw-r--r-- | 9.1 KB |
compat.c | -rw-r--r-- | 52.6 KB |
compat_ioctl.c | -rw-r--r-- | 82.9 KB |
dcache.c | -rw-r--r-- | 45.5 KB |
dcookies.c | -rw-r--r-- | 6.4 KB |
direct-io.c | -rw-r--r-- | 35.0 KB |
dnotify.c | -rw-r--r-- | 4.3 KB |
dquot.c | -rw-r--r-- | 52.5 KB |
drop_caches.c | -rw-r--r-- | 1.4 KB |
eventpoll.c | -rw-r--r-- | 44.3 KB |
exec.c | -rw-r--r-- | 34.9 KB |
fcntl.c | -rw-r--r-- | 13.7 KB |
fifo.c | -rw-r--r-- | 3.1 KB |
file.c | -rw-r--r-- | 8.6 KB |
file_table.c | -rw-r--r-- | 6.7 KB |
filesystems.c | -rw-r--r-- | 5.2 KB |
fs-writeback.c | -rw-r--r-- | 19.8 KB |
inode.c | -rw-r--r-- | 36.5 KB |
inotify.c | -rw-r--r-- | 19.2 KB |
inotify_user.c | -rw-r--r-- | 17.3 KB |
ioctl.c | -rw-r--r-- | 3.9 KB |
ioprio.c | -rw-r--r-- | 4.0 KB |
libfs.c | -rw-r--r-- | 15.4 KB |
locks.c | -rw-r--r-- | 54.5 KB |
mbcache.c | -rw-r--r-- | 18.2 KB |
mpage.c | -rw-r--r-- | 22.8 KB |
namei.c | -rw-r--r-- | 66.7 KB |
namespace.c | -rw-r--r-- | 46.9 KB |
nfsctl.c | -rw-r--r-- | 2.4 KB |
open.c | -rw-r--r-- | 27.5 KB |
pipe.c | -rw-r--r-- | 21.4 KB |
pnode.c | -rw-r--r-- | 7.6 KB |
pnode.h | -rw-r--r-- | 1013 bytes |
posix_acl.c | -rw-r--r-- | 8.5 KB |
quota.c | -rw-r--r-- | 8.9 KB |
quota_v1.c | -rw-r--r-- | 5.7 KB |
quota_v2.c | -rw-r--r-- | 20.1 KB |
read_write.c | -rw-r--r-- | 16.2 KB |
readdir.c | -rw-r--r-- | 6.7 KB |
select.c | -rw-r--r-- | 20.6 KB |
seq_file.c | -rw-r--r-- | 9.6 KB |
splice.c | -rw-r--r-- | 34.0 KB |
stat.c | -rw-r--r-- | 10.5 KB |
super.c | -rw-r--r-- | 20.3 KB |
sync.c | -rw-r--r-- | 4.4 KB |
xattr.c | -rw-r--r-- | 13.3 KB |
xattr_acl.c | -rw-r--r-- | 2.3 KB |
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