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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 <[email protected]>
Acked-by: Al Viro <[email protected]>
Cc: Nathan Scott <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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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2
security/dummy.c
View file

@ -191,7 +191,7 @@ static int dummy_sb_kern_mount (struct super_block *sb, void *data)
return 0;
}
static int dummy_sb_statfs (struct super_block *sb)
static int dummy_sb_statfs (struct dentry *dentry)
{
return 0;
}

6
security/selinux/hooks.c
View file

@ -1903,13 +1903,13 @@ static int selinux_sb_kern_mount(struct super_block *sb, void *data)
return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
}
static int selinux_sb_statfs(struct super_block *sb)
static int selinux_sb_statfs(struct dentry *dentry)
{
struct avc_audit_data ad;
AVC_AUDIT_DATA_INIT(&ad,FS);
ad.u.fs.dentry = sb->s_root;
return superblock_has_perm(current, sb, FILESYSTEM__GETATTR, &ad);
ad.u.fs.dentry = dentry->d_sb->s_root;
return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
}
static int selinux_mount(char * dev_name,