The patch titled
inode numbering: have pipefs ensure i_ino uniqueness by calling iunique and hashing the inode
has been added to the -mm tree. Its filename is
have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: inode numbering: have pipefs ensure i_ino uniqueness by calling iunique and hashing the inode
From: Jeff Layton <jlayton@xxxxxxxxxx>
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.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/pipe.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN fs/pipe.c~have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode fs/pipe.c
--- a/fs/pipe.c~have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode
+++ a/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(voi
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;
_
Patches currently in -mm which might be from jlayton@xxxxxxxxxx are
make-static-counters-in-new_inode-and-iunique-be-32-bits.patch
change-libfs-sb-creation-routines-to-avoid-collisions-with-their-root-inodes.patch
have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode.patch
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