Embed a struct path into struct nameidata instead of nd->{dentry,mnt}

This is the central patch of a cleanup series. In most cases there is no good
reason why someone would want to use a dentry for itself. This series reflects
that fact and embeds a struct path into nameidata.

Together with the other patches of this series
- it enforced the correct order of getting/releasing the reference count on
  <dentry,vfsmount> pairs
- it prepares the VFS for stacking support since it is essential to have a
  struct path in every place where the stack can be traversed
- it reduces the overall code size:

without patch series:
   text    data     bss     dec     hex filename
5321639  858418  715768 6895825  6938d1 vmlinux

with patch series:
   text    data     bss     dec     hex filename
5320026  858418  715768 6894212  693284 vmlinux

This patch:

Switch from nd->{dentry,mnt} to nd->path.{dentry,mnt} everywhere.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: fix cifs]
[akpm@linux-foundation.org: fix smack]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 35 insertions, 34 deletions

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 346570f6d848..2ac0e30285c2 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -169,8 +169,8 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
                         goto out;
 
                 dprintk("Found the path %s\n", buf);
-                key.ek_mnt = nd.mnt;
-                key.ek_dentry = nd.dentry;
+                key.ek_mnt = nd.path.mnt;
+                key.ek_dentry = nd.path.dentry;
                 
                 ek = svc_expkey_update(&key, ek);
                 if (ek)
@@ -507,7 +507,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
         struct svc_export exp, *expp;
         int an_int;
 
-        nd.dentry = NULL;
+        nd.path.dentry = NULL;
         exp.ex_path = NULL;
 
         /* fs locations */
@@ -547,8 +547,8 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
 
         exp.h.flags = 0;
         exp.ex_client = dom;
-        exp.ex_mnt = nd.mnt;
-        exp.ex_dentry = nd.dentry;
+        exp.ex_mnt = nd.path.mnt;
+        exp.ex_dentry = nd.path.dentry;
         exp.ex_path = kstrdup(buf, GFP_KERNEL);
         err = -ENOMEM;
         if (!exp.ex_path)
@@ -610,7 +610,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
                                 goto out;
                 }
 
-                err = check_export(nd.dentry->d_inode, exp.ex_flags,
+                err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
                                    exp.ex_uuid);
                 if (err) goto out;
         }
@@ -629,7 +629,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
         nfsd4_fslocs_free(&exp.ex_fslocs);
         kfree(exp.ex_uuid);
         kfree(exp.ex_path);
-        if (nd.dentry)
+        if (nd.path.dentry)
                 path_release(&nd);
  out_no_path:
         if (dom)
@@ -1030,7 +1030,7 @@ exp_export(struct nfsctl_export *nxp)
                 goto out_unlock;
         err = -EINVAL;
 
-        exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
+        exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
 
         memset(&new, 0, sizeof(new));
 
@@ -1038,7 +1038,8 @@ exp_export(struct nfsctl_export *nxp)
         if ((nxp->ex_flags & NFSEXP_FSID) &&
             (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
             fsid_key->ek_mnt &&
-            (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
+            (fsid_key->ek_mnt != nd.path.mnt ||
+             fsid_key->ek_dentry != nd.path.dentry))
                 goto finish;
 
         if (!IS_ERR(exp)) {
@@ -1054,7 +1055,7 @@ exp_export(struct nfsctl_export *nxp)
                 goto finish;
         }
 
-        err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL);
+        err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
         if (err) goto finish;
 
         err = -ENOMEM;
@@ -1067,8 +1068,8 @@ exp_export(struct nfsctl_export *nxp)
         if (!new.ex_path)
                 goto finish;
         new.ex_client = clp;
-        new.ex_mnt = nd.mnt;
-        new.ex_dentry = nd.dentry;
+        new.ex_mnt = nd.path.mnt;
+        new.ex_dentry = nd.path.dentry;
         new.ex_flags = nxp->ex_flags;
         new.ex_anon_uid = nxp->ex_anon_uid;
         new.ex_anon_gid = nxp->ex_anon_gid;
@@ -1148,7 +1149,7 @@ exp_unexport(struct nfsctl_export *nxp)
                 goto out_domain;
 
         err = -EINVAL;
-        exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
+        exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
         path_release(&nd);
         if (IS_ERR(exp))
                 goto out_domain;
@@ -1185,12 +1186,12 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
                 printk("nfsd: exp_rootfh path not found %s", path);
                 return err;
         }
-        inode = nd.dentry->d_inode;
+        inode = nd.path.dentry->d_inode;
 
         dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
-                 path, nd.dentry, clp->name,
+                 path, nd.path.dentry, clp->name,
                  inode->i_sb->s_id, inode->i_ino);
-        exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
+        exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
         if (IS_ERR(exp)) {
                 err = PTR_ERR(exp);
                 goto out;
@@ -1200,7 +1201,7 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
          * fh must be initialized before calling fh_compose
          */
         fh_init(&fh, maxsize);
-        if (fh_compose(&fh, exp, nd.dentry, NULL))
+        if (fh_compose(&fh, exp, nd.path.dentry, NULL))
                 err = -EINVAL;
         else
                 err = 0;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 1602cd00dd45..a7a8fdf86ea7 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -120,9 +120,9 @@ out_no_tfm:
 static void
 nfsd4_sync_rec_dir(void)
 {
-        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
-        nfsd_sync_dir(rec_dir.dentry);
-        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
+        mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
+        nfsd_sync_dir(rec_dir.path.dentry);
+        mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
 }
 
 int
@@ -142,9 +142,9 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
         nfs4_save_user(&uid, &gid);
 
         /* lock the parent */
-        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
+        mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
 
-        dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
+        dentry = lookup_one_len(dname, rec_dir.path.dentry, HEXDIR_LEN-1);
         if (IS_ERR(dentry)) {
                 status = PTR_ERR(dentry);
                 goto out_unlock;
@@ -154,11 +154,11 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
                 dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
                 goto out_put;
         }
-        status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
+        status = vfs_mkdir(rec_dir.path.dentry->d_inode, dentry, S_IRWXU);
 out_put:
         dput(dentry);
 out_unlock:
-        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
+        mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
         if (status == 0) {
                 clp->cl_firststate = 1;
                 nfsd4_sync_rec_dir();
@@ -221,7 +221,7 @@ nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
 
         nfs4_save_user(&uid, &gid);
 
-        filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
+        filp = dentry_open(dget(dir), mntget(rec_dir.path.mnt), O_RDONLY);
         status = PTR_ERR(filp);
         if (IS_ERR(filp))
                 goto out;
@@ -286,9 +286,9 @@ nfsd4_unlink_clid_dir(char *name, int namlen)
 
         dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
 
-        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
-        dentry = lookup_one_len(name, rec_dir.dentry, namlen);
-        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
+        mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
+        dentry = lookup_one_len(name, rec_dir.path.dentry, namlen);
+        mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
         if (IS_ERR(dentry)) {
                 status = PTR_ERR(dentry);
                 return status;
@@ -297,7 +297,7 @@ nfsd4_unlink_clid_dir(char *name, int namlen)
         if (!dentry->d_inode)
                 goto out;
 
-        status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
+        status = nfsd4_clear_clid_dir(rec_dir.path.dentry, dentry);
 out:
         dput(dentry);
         return status;
@@ -347,12 +347,12 @@ nfsd4_recdir_purge_old(void) {
 
         if (!rec_dir_init)
                 return;
-        status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
+        status = nfsd4_list_rec_dir(rec_dir.path.dentry, purge_old);
         if (status == 0)
                 nfsd4_sync_rec_dir();
         if (status)
                 printk("nfsd4: failed to purge old clients from recovery"
-                        " directory %s\n", rec_dir.dentry->d_name.name);
+                        " directory %s\n", rec_dir.path.dentry->d_name.name);
         return;
 }
 
@@ -373,10 +373,10 @@ int
 nfsd4_recdir_load(void) {
         int status;
 
-        status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
+        status = nfsd4_list_rec_dir(rec_dir.path.dentry, load_recdir);
         if (status)
                 printk("nfsd4: failed loading clients from recovery"
-                        " directory %s\n", rec_dir.dentry->d_name.name);
+                        " directory %s\n", rec_dir.path.dentry->d_name.name);
         return status;
 }
 
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f6744bc03dae..be2b9ecd230a 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3261,7 +3261,7 @@ nfs4_reset_recoverydir(char *recdir)
         if (status)
                 return status;
         status = -ENOTDIR;
-        if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
+        if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
                 nfs4_set_recdir(recdir);
                 status = 0;
         }