[XFS] Avoid directly referencing the VFS inode.

In several places we directly convert from the XFS inode
to the linux (VFS) inode by a simple deference of ip->i_vnode.
We should not do this - a helper function should be used to
extract the VFS inode from the XFS inode.

Introduce the function VFS_I() to extract the VFS inode
from the XFS inode. The name was chosen to match XFS_I() which
is used to extract the XFS inode from the VFS inode.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31720a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

9 files changed, 41 insertions, 30 deletions

diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index 987fe84f7b13..d3880b7c147d 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -139,7 +139,7 @@ xfs_nfs_get_inode(
         }
 
         xfs_iunlock(ip, XFS_ILOCK_SHARED);
-        return ip->i_vnode;
+        return VFS_I(ip);
 }
 
 STATIC struct dentry *
@@ -219,9 +219,9 @@ xfs_fs_get_parent(
         if (unlikely(error))
                 return ERR_PTR(-error);
 
-        parent = d_alloc_anon(cip->i_vnode);
+        parent = d_alloc_anon(VFS_I(cip));
         if (unlikely(!parent)) {
-                iput(cip->i_vnode);
+                iput(VFS_I(cip));
                 return ERR_PTR(-ENOMEM);
         }
         return parent;
diff --git a/fs/xfs/linux-2.6/xfs_fs_subr.c b/fs/xfs/linux-2.6/xfs_fs_subr.c
index 1eefe61f0e10..36caa6d957df 100644
--- a/fs/xfs/linux-2.6/xfs_fs_subr.c
+++ b/fs/xfs/linux-2.6/xfs_fs_subr.c
@@ -31,7 +31,7 @@ xfs_tosspages(
         xfs_off_t       last,
         int             fiopt)
 {
-        struct address_space *mapping = ip->i_vnode->i_mapping;
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
 
         if (mapping->nrpages)
                 truncate_inode_pages(mapping, first);
@@ -44,7 +44,7 @@ xfs_flushinval_pages(
         xfs_off_t       last,
         int             fiopt)
 {
-        struct address_space *mapping = ip->i_vnode->i_mapping;
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
         int             ret = 0;
 
         if (mapping->nrpages) {
@@ -64,7 +64,7 @@ xfs_flush_pages(
         uint64_t        flags,
         int             fiopt)
 {
-        struct address_space *mapping = ip->i_vnode->i_mapping;
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
         int             ret = 0;
         int             ret2;
 
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index e88f51028086..fec5ff5a2f17 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -62,7 +62,7 @@ void
 xfs_synchronize_atime(
         xfs_inode_t     *ip)
 {
-        struct inode    *inode = ip->i_vnode;
+        struct inode    *inode = VFS_I(ip);
 
         if (inode) {
                 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
@@ -79,7 +79,7 @@ void
 xfs_mark_inode_dirty_sync(
         xfs_inode_t     *ip)
 {
-        struct inode    *inode = ip->i_vnode;
+        struct inode    *inode = VFS_I(ip);
 
         if (inode)
                 mark_inode_dirty_sync(inode);
@@ -299,7 +299,7 @@ xfs_vn_mknod(
         if (unlikely(error))
                 goto out_free_acl;
 
-        inode = ip->i_vnode;
+        inode = VFS_I(ip);
 
         error = xfs_init_security(inode, dir);
         if (unlikely(error))
@@ -366,7 +366,7 @@ xfs_vn_lookup(
                 return NULL;
         }
 
-        return d_splice_alias(cip->i_vnode, dentry);
+        return d_splice_alias(VFS_I(cip), dentry);
 }
 
 STATIC struct dentry *
@@ -399,12 +399,12 @@ xfs_vn_ci_lookup(
 
         /* if exact match, just splice and exit */
         if (!ci_name.name)
-                return d_splice_alias(ip->i_vnode, dentry);
+                return d_splice_alias(VFS_I(ip), dentry);
 
         /* else case-insensitive match... */
         dname.name = ci_name.name;
         dname.len = ci_name.len;
-        dentry = d_add_ci(ip->i_vnode, dentry, &dname);
+        dentry = d_add_ci(VFS_I(ip), dentry, &dname);
         kmem_free(ci_name.name);
         return dentry;
 }
@@ -478,7 +478,7 @@ xfs_vn_symlink(
         if (unlikely(error))
                 goto out;
 
-        inode = cip->i_vnode;
+        inode = VFS_I(cip);
 
         error = xfs_init_security(inode, dir);
         if (unlikely(error))
diff --git a/fs/xfs/linux-2.6/xfs_iops.h b/fs/xfs/linux-2.6/xfs_iops.h
index d97ba934a2ac..fdda404bc343 100644
--- a/fs/xfs/linux-2.6/xfs_iops.h
+++ b/fs/xfs/linux-2.6/xfs_iops.h
@@ -33,10 +33,4 @@ struct xfs_inode;
 extern void xfs_ichgtime(struct xfs_inode *, int);
 extern void xfs_ichgtime_fast(struct xfs_inode *, struct inode *, int);
 
-#define xfs_vtoi(vp) \
-        ((struct xfs_inode *)vn_to_inode(vp)->i_private)
-
-#define XFS_I(inode) \
-        ((struct xfs_inode *)(inode)->i_private)
-
 #endif /* __XFS_IOPS_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 82333b3e118e..e03e2c3789b7 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -137,7 +137,7 @@ xfs_iozero(
         struct address_space    *mapping;
         int                     status;
 
-        mapping = ip->i_vnode->i_mapping;
+        mapping = VFS_I(ip)->i_mapping;
         do {
                 unsigned offset, bytes;
                 void *fsdata;
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 30ae96397e31..b49722940d6d 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1106,7 +1106,7 @@ void
 xfs_flush_inode(
         xfs_inode_t     *ip)
 {
-        struct inode    *inode = ip->i_vnode;
+        struct inode    *inode = VFS_I(ip);
 
         igrab(inode);
         xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_inode_work);
@@ -1825,7 +1825,7 @@ xfs_fs_fill_super(
         sb->s_time_gran = 1;
         set_posix_acl_flag(sb);
 
-        root = igrab(mp->m_rootip->i_vnode);
+        root = igrab(VFS_I(mp->m_rootip));
         if (!root) {
                 error = ENOENT;
                 goto fail_unmount;
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index b07604b94d9f..d44342640ca3 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -411,10 +411,11 @@ xfs_iput(xfs_inode_t	*ip,
  * Special iput for brand-new inodes that are still locked
  */
 void
-xfs_iput_new(xfs_inode_t        *ip,
-             uint               lock_flags)
+xfs_iput_new(
+        xfs_inode_t     *ip,
+        uint            lock_flags)
 {
-        struct inode    *inode = ip->i_vnode;
+        struct inode    *inode = VFS_I(ip);
 
         xfs_itrace_entry(ip);
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 17a04b6321ed..4a5e48c8ded2 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -263,6 +263,25 @@ typedef struct xfs_inode {
 #define XFS_ISIZE(ip)   (((ip)->i_d.di_mode & S_IFMT) == S_IFREG) ? \
                                 (ip)->i_size : (ip)->i_d.di_size;
 
+/* Convert from vfs inode to xfs inode */
+static inline struct xfs_inode *XFS_I(struct inode *inode)
+{
+        return (struct xfs_inode *)inode->i_private;
+}
+
+static inline struct xfs_inode *xfs_vtoi(bhv_vnode_t *vp)
+{
+        return XFS_I((struct inode *)vp);
+}
+
+/* convert from xfs inode to vfs inode */
+static inline struct inode *VFS_I(struct xfs_inode *ip)
+{
+        return (struct inode *)ip->i_vnode;
+}
+#define XFS_ITOV(ip)            VFS_I(ip)
+#define XFS_ITOV_NULL(ip)       VFS_I(ip)
+
 /*
  * i_flags helper functions
  */
@@ -439,9 +458,6 @@ xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
 #define XFS_ITRUNC_DEFINITE     0x1
 #define XFS_ITRUNC_MAYBE        0x2
 
-#define XFS_ITOV(ip)            ((ip)->i_vnode)
-#define XFS_ITOV_NULL(ip)       ((ip)->i_vnode)
-
 /*
  * For multiple groups support: if S_ISGID bit is set in the parent
  * directory, group of new file is set to that of the parent, and
diff --git a/fs/xfs/xfs_utils.c b/fs/xfs/xfs_utils.c
index 98e5f110ba5f..35d4d414bcc2 100644
--- a/fs/xfs/xfs_utils.c
+++ b/fs/xfs/xfs_utils.c
@@ -237,7 +237,7 @@ xfs_droplink(
 
         ASSERT (ip->i_d.di_nlink > 0);
         ip->i_d.di_nlink--;
-        drop_nlink(ip->i_vnode);
+        drop_nlink(VFS_I(ip));
         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 
         error = 0;
@@ -301,7 +301,7 @@ xfs_bumplink(
 
         ASSERT(ip->i_d.di_nlink > 0);
         ip->i_d.di_nlink++;
-        inc_nlink(ip->i_vnode);
+        inc_nlink(VFS_I(ip));
         if ((ip->i_d.di_version == XFS_DINODE_VERSION_1) &&
             (ip->i_d.di_nlink > XFS_MAXLINK_1)) {
                 /*