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SubjectRe: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper
Date
Cyrill Gorcunov <gorcunov@openvz.org> writes:

> To provide fsnotify object inodes being watched without
> binding to alphabetical path we need to encode them with
> exportfs help. This patch adds a helper which operates
> with plain inodes directly.

doesn't name_to_handle_at() work for you ? It also allows to get a file
handle using file descriptor.

>
> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
> Acked-by: Pavel Emelyanov <xemul@parallels.com>
> CC: Al Viro <viro@ZenIV.linux.org.uk>
> CC: Alexey Dobriyan <adobriyan@gmail.com>
> CC: Andrew Morton <akpm@linux-foundation.org>
> CC: James Bottomley <jbottomley@parallels.com>
> ---
> fs/exportfs/expfs.c | 19 +++++++++++++++++++
> include/linux/exportfs.h | 2 ++
> 2 files changed, 21 insertions(+)
>
> Index: linux-2.6.git/fs/exportfs/expfs.c
> ===================================================================
> --- linux-2.6.git.orig/fs/exportfs/expfs.c
> +++ linux-2.6.git/fs/exportfs/expfs.c
> @@ -302,6 +302,25 @@ out:
> return error;
> }
>
> +int export_encode_inode_fh(struct inode *inode, struct fid *fid, int *max_len)
> +{
> + int len = *max_len;
> + int type = FILEID_INO32_GEN;
> +
> + if (len < 2) {
> + *max_len = 2;
> + return 255;
> + }
> +
> + len = 2;
> + fid->i32.ino = inode->i_ino;
> + fid->i32.gen = inode->i_generation;
> + *max_len = len;
> +
> + return type;
> +}
> +EXPORT_SYMBOL_GPL(export_encode_inode_fh);
> +


If you are looking at getting file handle, that may not be
sufficient. Some file system put more info in file handle (btrfs)

> /**
> * export_encode_fh - default export_operations->encode_fh function
> * @inode: the object to encode
> Index: linux-2.6.git/include/linux/exportfs.h
> ===================================================================
> --- linux-2.6.git.orig/include/linux/exportfs.h
> +++ linux-2.6.git/include/linux/exportfs.h
> @@ -177,6 +177,8 @@ struct export_operations {
> int (*commit_metadata)(struct inode *inode);
> };
>
> +extern int export_encode_inode_fh(struct inode *inode, struct fid *fid, int *max_len);
> +
> extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid,
> int *max_len, int connectable);
> extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
>

-aneesh



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