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Date: Thu, 25 Oct 2007 13:36:45 -0500
From: Kumar Gala <galak@...nel.crashing.org>
To: Trond Myklebust <Trond.Myklebust@...app.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
nfs@...ts.sourceforge.net, neilb@...e.de, bfields@...ldses.org,
chuck.lever@...cle.com
Subject: Re: LTP ustat01 test fails on NFSROOT
On Oct 25, 2007, at 12:59 PM, Trond Myklebust wrote:
> Could you please try the following patch?
this fixes my issue. Any reason this hasn't been accepted?
- k
> --------------------------------- CUT HERE
> -----------------------------
> From: Trond Myklebust <Trond.Myklebust@...app.com>
> Date: Thu, 25 Oct 2007 13:56:10 -0400
> NFS: Fix the ustat() regression
>
> Since 2.6.18, the superblock sb->s_root has been a dummy dentry with a
> dummy inode. This breaks ustat(), which actually uses sb->s_root in a
> vfstat() call.
>
> Fix this by making the s_root a dummy alias to the directory inode
> that was
> used when creating the superblock.
>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
> ---
>
> fs/nfs/getroot.c | 81 +++++++++++++++++
> +------------------------------------
> 1 files changed, 27 insertions(+), 54 deletions(-)
>
> diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
> index 522e5ad..0ee4384 100644
> --- a/fs/nfs/getroot.c
> +++ b/fs/nfs/getroot.c
> @@ -43,6 +43,25 @@
> #define NFSDBG_FACILITY NFSDBG_CLIENT
>
> /*
> + * Set the superblock root dentry.
> + * Note that this function frees the inode in case of error.
> + */
> +static int nfs_superblock_set_dummy_root(struct super_block *sb,
> struct inode *inode)
> +{
> + /* The mntroot acts as the dummy root dentry for this superblock */
> + if (sb->s_root == NULL) {
> + sb->s_root = d_alloc_root(inode);
> + if (sb->s_root == NULL) {
> + iput(inode);
> + return -ENOMEM;
> + }
> + /* Circumvent igrab(): we know the inode is not being freed */
> + atomic_inc(&inode->i_count);
> + }
> + return 0;
> +}
> +
> +/*
> * get an NFS2/NFS3 root dentry from the root filehandle
> */
> struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh
> *mntfh)
> @@ -54,33 +73,6 @@ struct dentry *nfs_get_root(struct super_block
> *sb, struct nfs_fh *mntfh)
> struct inode *inode;
> int error;
>
> - /* create a dummy root dentry with dummy inode for this
> superblock */
> - if (!sb->s_root) {
> - struct nfs_fh dummyfh;
> - struct dentry *root;
> - struct inode *iroot;
> -
> - memset(&dummyfh, 0, sizeof(dummyfh));
> - memset(&fattr, 0, sizeof(fattr));
> - nfs_fattr_init(&fattr);
> - fattr.valid = NFS_ATTR_FATTR;
> - fattr.type = NFDIR;
> - fattr.mode = S_IFDIR | S_IRUSR | S_IWUSR;
> - fattr.nlink = 2;
> -
> - iroot = nfs_fhget(sb, &dummyfh, &fattr);
> - if (IS_ERR(iroot))
> - return ERR_PTR(PTR_ERR(iroot));
> -
> - root = d_alloc_root(iroot);
> - if (!root) {
> - iput(iroot);
> - return ERR_PTR(-ENOMEM);
> - }
> -
> - sb->s_root = root;
> - }
> -
> /* get the actual root for this mount */
> fsinfo.fattr = &fattr;
>
> @@ -96,6 +88,10 @@ struct dentry *nfs_get_root(struct super_block
> *sb, struct nfs_fh *mntfh)
> return ERR_PTR(PTR_ERR(inode));
> }
>
> + error = nfs_superblock_set_dummy_root(sb, inode);
> + if (error != 0)
> + return ERR_PTR(error);
> +
> /* root dentries normally start off anonymous and get spliced in
> later
> * if the dentry tree reaches them; however if the dentry already
> * exists, we'll pick it up at this point and use it as the root
> @@ -241,33 +237,6 @@ struct dentry *nfs4_get_root(struct
> super_block *sb, struct nfs_fh *mntfh)
>
> dprintk("--> nfs4_get_root()\n");
>
> - /* create a dummy root dentry with dummy inode for this
> superblock */
> - if (!sb->s_root) {
> - struct nfs_fh dummyfh;
> - struct dentry *root;
> - struct inode *iroot;
> -
> - memset(&dummyfh, 0, sizeof(dummyfh));
> - memset(&fattr, 0, sizeof(fattr));
> - nfs_fattr_init(&fattr);
> - fattr.valid = NFS_ATTR_FATTR;
> - fattr.type = NFDIR;
> - fattr.mode = S_IFDIR | S_IRUSR | S_IWUSR;
> - fattr.nlink = 2;
> -
> - iroot = nfs_fhget(sb, &dummyfh, &fattr);
> - if (IS_ERR(iroot))
> - return ERR_PTR(PTR_ERR(iroot));
> -
> - root = d_alloc_root(iroot);
> - if (!root) {
> - iput(iroot);
> - return ERR_PTR(-ENOMEM);
> - }
> -
> - sb->s_root = root;
> - }
> -
> /* get the info about the server and filesystem */
> error = nfs4_server_capabilities(server, mntfh);
> if (error < 0) {
> @@ -289,6 +258,10 @@ struct dentry *nfs4_get_root(struct
> super_block *sb, struct nfs_fh *mntfh)
> return ERR_PTR(PTR_ERR(inode));
> }
>
> + error = nfs_superblock_set_dummy_root(sb, inode);
> + if (error != 0)
> + return ERR_PTR(error);
> +
> /* root dentries normally start off anonymous and get spliced in
> later
> * if the dentry tree reaches them; however if the dentry already
> * exists, we'll pick it up at this point and use it as the root
-
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