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authorNick Piggin <npiggin@suse.de>2009-03-11 13:17:36 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2009-03-27 14:44:05 -0400
commitaabb8fdb41128705fd1627f56fdd571e45fdbcdb (patch)
treebae6e9abf167cf20b9a2d3e5c38520d3f17b777d /fs/notify
parent1bd7903560f1f713e85188a5aaf4d2428b6c8b50 (diff)
fs: avoid I_NEW inodes
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>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/inotify/inotify.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/notify/inotify/inotify.c b/fs/notify/inotify/inotify.c
index 331f2e88e28..220c13f0d73 100644
--- a/fs/notify/inotify/inotify.c
+++ b/fs/notify/inotify/inotify.c
@@ -380,6 +380,14 @@ void inotify_unmount_inodes(struct list_head *list)
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
* evict all inodes with zero i_count from icache which is
@@ -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. */