lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

fs: avoid I_NEW inodes

Browse Source 
To be on the safe side, it should be less fragile to exclude I_NEW inodes
from inode list scans by default (unless there is an important reason to
have them).

Normally they will get excluded (eg.  by zero refcount or writecount etc),
however it is a bit fragile for list walkers to know exactly what parts of
the inode state is set up and valid to test when in I_NEW.  So along these
lines, move I_NEW checks upward as well (sometimes taking I_FREEING etc
checks with them too -- this shouldn't be a problem should it?)

Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Nick Piggin
2009-03-11 13:17:36 -07:00
committed by Al Viro
parent 1bd7903560
commit aabb8fdb41
4 changed files with 19 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
fs/notify/inotify/inotify.c
View File

@@ -379,6 +379,14 @@ void inotify_unmount_inodes(struct list_head *list)
struct inode *need_iput_tmp;
struct list_head *watches;
/*
* We cannot __iget() an inode in state I_CLEAR, I_FREEING,
* I_WILL_FREE, or I_NEW which is fine because by that point
* the inode cannot have any associated watches.
*/
if (inode->i_state & (I_CLEAR|I_FREEING|I_WILL_FREE|I_NEW))
continue;
/*
* If i_count is zero, the inode cannot have any watches and
* doing an __iget/iput with MS_ACTIVE clear would actually
@@ -388,14 +396,6 @@ void inotify_unmount_inodes(struct list_head *list)
if (!atomic_read(&inode->i_count))
continue;
/*
* We cannot __iget() an inode in state I_CLEAR, I_FREEING, or
* I_WILL_FREE which is fine because by that point the inode
* cannot have any associated watches.
*/
if (inode->i_state & (I_CLEAR | I_FREEING | I_WILL_FREE))
continue;
need_iput_tmp = need_iput;
need_iput = NULL;
/* In case inotify_remove_watch_locked() drops a reference. */