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Kill off xfs_statvfs.

We were already filling the Linux struct statfs anyway, and doing this
trivial task directly in xfs_fs_statfs makes the code quite a bit cleaner.
While I was at it I also moved copying attributes that don't change over
the lifetime of the filesystem outside the superblock lock.

xfs_fs_fill_super used to get the magic number and blocksize through
xfs_statvfs, but assigning them directly is a lot cleaner and will save
some stack space during mount.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29802a by kenmcd.

  Kill off xfs_statvfs.

#ifndef _XFS_VFSOPS_H
#define _XFS_VFSOPS_H 1

struct cred;
struct xfs_fid;
struct inode;
struct kstatfs;
struct xfs_mount;
struct xfs_mount_args;

int xfs_mount(struct xfs_mount *mp, struct xfs_mount_args *args,
		struct cred *credp);
int xfs_unmount(struct xfs_mount *mp, int flags, struct cred *credp);
int xfs_mntupdate(struct xfs_mount *mp, int *flags,
		struct xfs_mount_args *args);
int xfs_root(struct xfs_mount *mp, bhv_vnode_t **vpp);
int xfs_sync(struct xfs_mount *mp, int flags);
int xfs_vget(struct xfs_mount *mp, bhv_vnode_t **vpp, struct xfs_fid *xfid);
int xfs_parseargs(struct xfs_mount *mp, char *options,
		struct xfs_mount_args *args, int update);
int xfs_showargs(struct xfs_mount *mp, struct seq_file *m);
void xfs_freeze(struct xfs_mount *mp);
void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
		int lnnum);

#endif /* _XFS_VFSOPS_H */