Hello again,

For information: I tried adding the needed callbacks, deriving them from the generic implementations, and so far, it seems to be mostly working.

i.e. I added the code included below this mail in the file yaffs_fs.c

Please let me know what you think of this fix and/or if you’d have a better one…

Thanks for your reading,

Best wishes,

Jean-Loup

PS: Here is the added code to yaffs_fs.c

static struct inode *

    yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)

    {

        return yaffs_iget(sb, ino);

    }

static struct dentry *

    yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)

    {

        return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;

    }

static struct dentry *

    yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)

    {

        return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);

    }   

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9))

/* Just declare a zero structure as a NULL value implies

 * using the default functions of expfs.

 */

static struct export_operations yaffs_export_ops =

    {

    .fh_to_dentry = yaffs2_fh_to_dentry,

    .fh_to_parent = yaffs2_fh_to_parent,

    // .get_parent = yaffs2_get_parent,

} ;

#endif

---

De : Jean-Loup Sabatier
Envoyé : mardi 1 juillet 2008 17:28
À : yaffs@lists.aleph1.co.uk
Objet : [YAFFS] NFS export with YAFFS2

Good morning, all,

I'd need some advice and information about a problem I've got with NFS and YAFFS2…

We are trying to export a YAFFS2 partition through an NFS export...

When you try to do so with a standard YAFFS2 on a Linux version greater than 2.6, you get the following error message:

"exp_export: export of invalid fs type."

To allow the NFS export, with Linux 2.6.16, you only had to make 2 minor changes in yaffs_fs.c :

1) Add an empty struct :

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9))

    /* Just declare a zero structure as a NULL value implies

     * using the default functions of expfs.

*/

    static struct export_operations yaffs_export_ops ;

    #endif

2) And to make sure that the superblock points at it by adding a line into "yaffs_internal_read_super"

    #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9))

        sb->s_export_op = &yaffs_export_ops;

    #endif

However, on a kernel 2.6.25, it gets tricky: We need to define 3 callback functions in the struct export_operations:

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9))

    /* Just declare a zero structure as a NULL value implies

     * using the default functions of expfs.

     */

    static struct export_operations yaffs_export_ops =

        {

        .fh_to_dentry = yaffs2_fh_to_dentry,

        .fh_to_parent = yaffs2_fh_to_parent,

        .get_parent = yaffs2_get_parent

        } ;

    #endif

The generic implementation of the callback functions (.fh_to_dentry, .fh_to_parent, .get_parent) does not work.

Anyone has an idea about how to implement these functions?

Thank you very much for your reading and thanks in advance for your advices,

Regards,

Jean-Loup Sabatier