[PATCH 3/3] have pipefs ensure i_ino uniqueness by calling iunique and hashing the inode

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This converts pipefs to use the new scheme. Here we're calling iunique to get
a unique i_ino value for the new inode, and then hashing it afterward. We
call iunique with a max_reserved value of 1 to avoid collision with the root
inode.  Since the inode is now hashed, we need to take care that we end up in
generic_delete_inode rather than generic_forget_inode or we'll create a nasty
leak, so we clear_nlink when we destroy the pipe info.

I'm not certain that this is the right place to add the clear_nlink, though
it does seem to work. I'm open to suggestions on a better place to put
this, or of a better way to make sure that we end up with i_nlink == 0 at
iput time.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>

diff --git a/fs/pipe.c b/fs/pipe.c
index 68090e8..1d44ff0 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -825,6 +825,7 @@ void free_pipe_info(struct inode *inode)
 {
 	__free_pipe_info(inode->i_pipe);
 	inode->i_pipe = NULL;
+	clear_nlink(inode);
 }
 
 static struct vfsmount *pipe_mnt __read_mostly;
@@ -871,6 +872,8 @@ static struct inode * get_pipe_inode(void)
 	inode->i_uid = current->fsuid;
 	inode->i_gid = current->fsgid;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	inode->i_ino = iunique(pipe_mnt->mnt_sb, 1);
+	insert_inode_hash(inode);
 
 	return inode;
 
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux