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SubjectRe: [2.4.19] How to get the path name of a struct dentry
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On Wednesday 12 March 2003 11:47, Christoph Hellwig wrote:
> On Wed, Mar 12, 2003 at 11:38:27AM +0100, Torsten Foertsch wrote:
> > Next question, is there a way to get the dentry and vfsmount of /? I mean
> > not current->fs->root and current->fs->rootmnt. They can be chrooted. I
> > mean the real /.
>
> No. Esecially as there is not single "real" root.


How about that slightly modified d_path()?

char*
full_d_path( struct dentry *dentry,
struct vfsmount *vfsmnt,
char *buf, int buflen ) {
char *res;
struct vfsmount *rootmnt;
struct dentry *root;
read_lock(&current->fs->lock);
rootmnt = mntget(current->fs->rootmnt);
read_unlock(&current->fs->lock);

while( rootmnt!=rootmnt->mnt_parent ) {
struct vfsmount *h=mntget( rootmnt->mnt_parent );
mntput( rootmnt );
rootmnt=h;
}

root = dget(rootmnt->mnt_root);

spin_lock(&dcache_lock);
res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen);
spin_unlock(&dcache_lock);

dput(root);
mntput(rootmnt);
return res;
}
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