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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry

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Give the statfs superblock operation a dentry pointer rather than a superblock
pointer.

This complements the get_sb() patch.  That reduced the significance of
sb->s_root, allowing NFS to place a fake root there.  However, NFS does
require a dentry to use as a target for the statfs operation.  This permits
the root in the vfsmount to be used instead.

linux/mount.h has been added where necessary to make allyesconfig build
successfully.

Interest has also been expressed for use with the FUSE and XFS filesystems.

Signed-off-by: David Howells <[email protected]>
Acked-by: Al Viro <[email protected]>
Cc: Nathan Scott <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2006-06-23 02:02:58 -07:00 • committed by Linus Torvalds
commit 726c334223
60 changed files with 175 additions and 144 deletions
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4
fs/hostfs/hostfs_kern.c
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@ -239,7 +239,7 @@ static int read_inode(struct inode *ino)
return(err);
}
int hostfs_statfs(struct super_block *sb, struct kstatfs *sf)
int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
/* do_statfs uses struct statfs64 internally, but the linux kernel
* struct statfs still has 32-bit versions for most of these fields,
@ -252,7 +252,7 @@ int hostfs_statfs(struct super_block *sb, struct kstatfs *sf)
long long f_files;
long long f_ffree;
err = do_statfs(HOSTFS_I(sb->s_root->d_inode)->host_filename,
err = do_statfs(HOSTFS_I(dentry->d_sb->s_root->d_inode)->host_filename,
&sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,
&f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),
&sf->f_namelen, sf->f_spare);