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

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 <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 13 deletions

diff --git a/fs/open.c b/fs/open.c
index 4f178acd4c09..a37ff861108f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -31,18 +31,18 @@
 
 #include <asm/unistd.h>
 
-int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
+int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
         int retval = -ENODEV;
 
-        if (sb) {
+        if (dentry) {
                 retval = -ENOSYS;
-                if (sb->s_op->statfs) {
+                if (dentry->d_sb->s_op->statfs) {
                         memset(buf, 0, sizeof(*buf));
-                        retval = security_sb_statfs(sb);
+                        retval = security_sb_statfs(dentry);
                         if (retval)
                                 return retval;
-                        retval = sb->s_op->statfs(sb, buf);
+                        retval = dentry->d_sb->s_op->statfs(dentry, buf);
                         if (retval == 0 && buf->f_frsize == 0)
                                 buf->f_frsize = buf->f_bsize;
                 }
@@ -52,12 +52,12 @@ int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
 
 EXPORT_SYMBOL(vfs_statfs);
 
-static int vfs_statfs_native(struct super_block *sb, struct statfs *buf)
+static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
 {
         struct kstatfs st;
         int retval;
 
-        retval = vfs_statfs(sb, &st);
+        retval = vfs_statfs(dentry, &st);
         if (retval)
                 return retval;
 
@@ -95,12 +95,12 @@ static int vfs_statfs_native(struct super_block *sb, struct statfs *buf)
         return 0;
 }
 
-static int vfs_statfs64(struct super_block *sb, struct statfs64 *buf)
+static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
 {
         struct kstatfs st;
         int retval;
 
-        retval = vfs_statfs(sb, &st);
+        retval = vfs_statfs(dentry, &st);
         if (retval)
                 return retval;
 
@@ -130,7 +130,7 @@ asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
         error = user_path_walk(path, &nd);
         if (!error) {
                 struct statfs tmp;
-                error = vfs_statfs_native(nd.dentry->d_inode->i_sb, &tmp);
+                error = vfs_statfs_native(nd.dentry, &tmp);
                 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                         error = -EFAULT;
                 path_release(&nd);
@@ -149,7 +149,7 @@ asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64
         error = user_path_walk(path, &nd);
         if (!error) {
                 struct statfs64 tmp;
-                error = vfs_statfs64(nd.dentry->d_inode->i_sb, &tmp);
+                error = vfs_statfs64(nd.dentry, &tmp);
                 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                         error = -EFAULT;
                 path_release(&nd);
@@ -168,7 +168,7 @@ asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user * buf)
         file = fget(fd);
         if (!file)
                 goto out;
-        error = vfs_statfs_native(file->f_dentry->d_inode->i_sb, &tmp);
+        error = vfs_statfs_native(file->f_dentry, &tmp);
         if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                 error = -EFAULT;
         fput(file);
@@ -189,7 +189,7 @@ asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz, struct statfs64 __user
         file = fget(fd);
         if (!file)
                 goto out;
-        error = vfs_statfs64(file->f_dentry->d_inode->i_sb, &tmp);
+        error = vfs_statfs64(file->f_dentry, &tmp);
         if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                 error = -EFAULT;
         fput(file);