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vfs: don't use PARENT/CHILD lock classes for non-directories 

Reserve I_MUTEX_PARENT and I_MUTEX_CHILD for locking of actual
directories.

(Also I_MUTEX_QUOTA isn't really a meaningful name for this locking
class any more; fixed in a later patch.)

Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
J. Bruce Fields 2012-04-25 07:19:52 -04:00 committed by syphyr
parent b219c6de2d
commit 8a1d852999
1 changed files with 5 additions and 5 deletions
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10
fs/inode.c
View File

@ -993,16 +993,16 @@ void lock_two_nondirectories(struct inode *inode1, struct inode *inode2)
{
WARN_ON_ONCE(S_ISDIR(inode1->i_mode));
if (inode1 == inode2 || !inode2) {
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
mutex_lock(&inode1->i_mutex);
return;
}
WARN_ON_ONCE(S_ISDIR(inode2->i_mode));
if (inode1 < inode2) {
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
mutex_lock(&inode1->i_mutex);
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_QUOTA);
} else {
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
mutex_lock(&inode2->i_mutex);
mutex_lock_nested(&inode1->i_mutex, I_MUTEX_QUOTA);
}
}
EXPORT_SYMBOL(lock_two_nondirectories);