2 * linux/kernel/vserver/inode.c
4 * Virtual Server: File System Support
6 * Copyright (C) 2004 Herbert Pƶtzl
8 * V0.01 separated from vcontext V0.05
12 #include <linux/config.h>
13 #include <linux/vinline.h>
15 #include <linux/proc_fs.h>
16 #include <linux/namei.h>
17 #include <linux/vserver/inode.h>
19 #include <asm/errno.h>
20 #include <asm/uaccess.h>
23 static int __vc_get_iattr(struct inode *in, uint32_t *xid, uint32_t *flags, uint32_t *mask)
29 | (IS_BARRIER(in) ? IATTR_BARRIER : 0)
30 | (IS_IUNLINK(in) ? IATTR_IUNLINK : 0)
31 | (IS_IMMUTABLE(in) ? IATTR_IMMUTABLE : 0);
32 *mask = IATTR_IUNLINK | IATTR_IMMUTABLE;
34 if (S_ISDIR(in->i_mode))
35 *mask |= IATTR_BARRIER;
37 if (in->i_sb->s_flags & MS_TAGXID) {
42 if (in->i_sb->s_magic == PROC_SUPER_MAGIC) {
43 struct proc_dir_entry *entry = PROC_I(in)->pde;
45 // check for specific inodes ?
49 *flags |= (entry->vx_flags & IATTR_FLAGS);
51 *flags |= (PROC_I(in)->vx_flags & IATTR_FLAGS);
56 int vc_get_iattr(uint32_t id, void __user *data)
59 struct vcmd_ctx_iattr_v1 vc_data;
62 if (!vx_check(0, VX_ADMIN))
64 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
67 ret = user_path_walk_link(vc_data.name, &nd);
69 ret = __vc_get_iattr(nd.dentry->d_inode,
70 &vc_data.xid, &vc_data.flags, &vc_data.mask);
74 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
79 static int __vc_set_iattr(struct dentry *de, uint32_t *xid, uint32_t *flags, uint32_t *mask)
81 struct inode *in = de->d_inode;
82 int error = 0, is_proc = 0;
87 is_proc = (in->i_sb->s_magic == PROC_SUPER_MAGIC);
88 if ((*mask & IATTR_FLAGS) && !is_proc)
90 if ((*mask & IATTR_XID) && !(in->i_sb->s_flags & MS_TAGXID))
94 if (*mask & IATTR_XID)
97 if (*mask & IATTR_FLAGS) {
98 struct proc_dir_entry *entry = PROC_I(in)->pde;
99 unsigned int iflags = PROC_I(in)->vx_flags;
101 iflags = (iflags & ~(*mask & IATTR_FLAGS))
102 | (*flags & IATTR_FLAGS);
103 PROC_I(in)->vx_flags = iflags;
105 entry->vx_flags = iflags;
108 if (*mask & (IATTR_BARRIER | IATTR_IUNLINK | IATTR_IMMUTABLE)) {
111 attr.ia_valid = ATTR_ATTR_FLAG;
113 (IS_IMMUTABLE(in) ? ATTR_FLAG_IMMUTABLE : 0) |
114 (IS_IUNLINK(in) ? ATTR_FLAG_IUNLINK : 0) |
115 (IS_BARRIER(in) ? ATTR_FLAG_BARRIER : 0);
117 if (*mask & IATTR_IMMUTABLE) {
118 if (*flags & IATTR_IMMUTABLE)
119 attr.ia_attr_flags |= ATTR_FLAG_IMMUTABLE;
121 attr.ia_attr_flags &= ~ATTR_FLAG_IMMUTABLE;
123 if (*mask & IATTR_IUNLINK) {
124 if (*flags & IATTR_IUNLINK)
125 attr.ia_attr_flags |= ATTR_FLAG_IUNLINK;
127 attr.ia_attr_flags &= ~ATTR_FLAG_IUNLINK;
129 if (S_ISDIR(in->i_mode) && (*mask & IATTR_BARRIER)) {
130 if (*flags & IATTR_BARRIER)
131 attr.ia_attr_flags |= ATTR_FLAG_BARRIER;
133 attr.ia_attr_flags &= ~ATTR_FLAG_BARRIER;
135 if (in->i_op && in->i_op->setattr)
136 error = in->i_op->setattr(de, &attr);
138 error = inode_change_ok(in, &attr);
140 error = inode_setattr(in, &attr);
144 mark_inode_dirty(in);
149 int vc_set_iattr(uint32_t id, void __user *data)
152 struct vcmd_ctx_iattr_v1 vc_data;
155 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_LINUX_IMMUTABLE))
157 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
160 ret = user_path_walk_link(vc_data.name, &nd);
162 ret = __vc_set_iattr(nd.dentry,
163 &vc_data.xid, &vc_data.flags, &vc_data.mask);
167 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
173 #ifdef CONFIG_VSERVER_LEGACY
174 #include <linux/proc_fs.h>
176 #define PROC_DYNAMIC_FIRST 0xF0000000UL
178 int vx_proc_ioctl(struct inode * inode, struct file * filp,
179 unsigned int cmd, unsigned long arg)
181 struct proc_dir_entry *entry;
185 if (inode->i_ino < PROC_DYNAMIC_FIRST)
188 entry = PROC_I(inode)->pde;
192 /* fixme: if stealth, return -ENOTTY */
194 flags = entry->vx_flags;
195 if (capable(CAP_CONTEXT))
196 error = put_user(flags, (int *) arg);
200 /* fixme: if stealth, return -ENOTTY */
202 if (!capable(CAP_CONTEXT))
205 if (IS_RDONLY(inode))
208 if (get_user(flags, (int *) arg))
211 entry->vx_flags = flags;