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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 <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>
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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14
include/linux/security.h
View file

@ -171,9 +171,9 @@ struct swap_info_struct;
* Deallocate and clear the sb->s_security field.
* @sb contains the super_block structure to be modified.
* @sb_statfs:
* Check permission before obtaining filesystem statistics for the @sb
* filesystem.
* @sb contains the super_block structure for the filesystem.
* Check permission before obtaining filesystem statistics for the @mnt
* mountpoint.
* @dentry is a handle on the superblock for the filesystem.
* Return 0 if permission is granted.
* @sb_mount:
* Check permission before an object specified by @dev_name is mounted on
@ -1127,7 +1127,7 @@ struct security_operations {
int (*sb_copy_data)(struct file_system_type *type,
void *orig, void *copy);
int (*sb_kern_mount) (struct super_block *sb, void *data);
int (*sb_statfs) (struct super_block * sb);
int (*sb_statfs) (struct dentry *dentry);
int (*sb_mount) (char *dev_name, struct nameidata * nd,
char *type, unsigned long flags, void *data);
int (*sb_check_sb) (struct vfsmount * mnt, struct nameidata * nd);
@ -1450,9 +1450,9 @@ static inline int security_sb_kern_mount (struct super_block *sb, void *data)
return security_ops->sb_kern_mount (sb, data);
}
static inline int security_sb_statfs (struct super_block *sb)
static inline int security_sb_statfs (struct dentry *dentry)
{
return security_ops->sb_statfs (sb);
return security_ops->sb_statfs (dentry);
}
static inline int security_sb_mount (char *dev_name, struct nameidata *nd,
@ -2162,7 +2162,7 @@ static inline int security_sb_kern_mount (struct super_block *sb, void *data)
return 0;
}
static inline int security_sb_statfs (struct super_block *sb)
static inline int security_sb_statfs (struct dentry *dentry)
{
return 0;
}