2 * linux/kernel/vserver/inode.c
4 * Virtual Server: File System Support
6 * Copyright (C) 2004 Herbert Pötzl
8 * V0.01 separated from vcontext V0.05
12 #include <linux/config.h>
13 #include <linux/sched.h>
14 #include <linux/vs_context.h>
15 #include <linux/proc_fs.h>
16 #include <linux/devpts_fs.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/parser.h>
20 #include <linux/vserver/inode.h>
21 #include <linux/vserver/xid.h>
23 #include <asm/errno.h>
24 #include <asm/uaccess.h>
27 static int __vc_get_iattr(struct inode *in, uint32_t *xid, uint32_t *flags, uint32_t *mask)
29 struct proc_dir_entry *entry;
35 | (IS_BARRIER(in) ? IATTR_BARRIER : 0)
36 | (IS_IUNLINK(in) ? IATTR_IUNLINK : 0)
37 | (IS_IMMUTABLE(in) ? IATTR_IMMUTABLE : 0);
38 *mask = IATTR_IUNLINK | IATTR_IMMUTABLE;
40 if (S_ISDIR(in->i_mode))
41 *mask |= IATTR_BARRIER;
43 if (in->i_sb->s_flags & MS_TAGXID) {
48 switch (in->i_sb->s_magic) {
49 case PROC_SUPER_MAGIC:
50 entry = PROC_I(in)->pde;
52 // check for specific inodes ?
56 *flags |= (entry->vx_flags & IATTR_FLAGS);
58 *flags |= (PROC_I(in)->vx_flags & IATTR_FLAGS);
61 case DEVPTS_SUPER_MAGIC:
72 int vc_get_iattr(uint32_t id, void __user *data)
75 struct vcmd_ctx_iattr_v1 vc_data = { .xid = -1 };
78 if (!vx_check(0, VX_ADMIN))
80 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
83 ret = user_path_walk_link(vc_data.name, &nd);
85 ret = __vc_get_iattr(nd.dentry->d_inode,
86 &vc_data.xid, &vc_data.flags, &vc_data.mask);
90 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
95 static int __vc_set_iattr(struct dentry *de, uint32_t *xid, uint32_t *flags, uint32_t *mask)
97 struct inode *in = de->d_inode;
98 int error = 0, is_proc = 0, has_xid = 0;
100 if (!in || !in->i_sb)
103 is_proc = (in->i_sb->s_magic == PROC_SUPER_MAGIC);
104 if ((*mask & IATTR_FLAGS) && !is_proc)
107 has_xid = (in->i_sb->s_flags & MS_TAGXID) ||
108 (in->i_sb->s_magic == DEVPTS_SUPER_MAGIC);
109 if ((*mask & IATTR_XID) && !has_xid)
113 if (*mask & IATTR_XID)
116 if (*mask & IATTR_FLAGS) {
117 struct proc_dir_entry *entry = PROC_I(in)->pde;
118 unsigned int iflags = PROC_I(in)->vx_flags;
120 iflags = (iflags & ~(*mask & IATTR_FLAGS))
121 | (*flags & IATTR_FLAGS);
122 PROC_I(in)->vx_flags = iflags;
124 entry->vx_flags = iflags;
127 if (*mask & (IATTR_BARRIER | IATTR_IUNLINK | IATTR_IMMUTABLE)) {
130 attr.ia_valid = ATTR_ATTR_FLAG;
132 (IS_IMMUTABLE(in) ? ATTR_FLAG_IMMUTABLE : 0) |
133 (IS_IUNLINK(in) ? ATTR_FLAG_IUNLINK : 0) |
134 (IS_BARRIER(in) ? ATTR_FLAG_BARRIER : 0);
136 if (*mask & IATTR_IMMUTABLE) {
137 if (*flags & IATTR_IMMUTABLE)
138 attr.ia_attr_flags |= ATTR_FLAG_IMMUTABLE;
140 attr.ia_attr_flags &= ~ATTR_FLAG_IMMUTABLE;
142 if (*mask & IATTR_IUNLINK) {
143 if (*flags & IATTR_IUNLINK)
144 attr.ia_attr_flags |= ATTR_FLAG_IUNLINK;
146 attr.ia_attr_flags &= ~ATTR_FLAG_IUNLINK;
148 if (S_ISDIR(in->i_mode) && (*mask & IATTR_BARRIER)) {
149 if (*flags & IATTR_BARRIER)
150 attr.ia_attr_flags |= ATTR_FLAG_BARRIER;
152 attr.ia_attr_flags &= ~ATTR_FLAG_BARRIER;
154 if (in->i_op && in->i_op->setattr)
155 error = in->i_op->setattr(de, &attr);
157 error = inode_change_ok(in, &attr);
159 error = inode_setattr(in, &attr);
163 mark_inode_dirty(in);
168 int vc_set_iattr(uint32_t id, void __user *data)
171 struct vcmd_ctx_iattr_v1 vc_data;
174 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_LINUX_IMMUTABLE))
176 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
179 ret = user_path_walk_link(vc_data.name, &nd);
181 ret = __vc_set_iattr(nd.dentry,
182 &vc_data.xid, &vc_data.flags, &vc_data.mask);
186 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
192 #ifdef CONFIG_VSERVER_LEGACY
194 #define PROC_DYNAMIC_FIRST 0xF0000000UL
196 int vx_proc_ioctl(struct inode * inode, struct file * filp,
197 unsigned int cmd, unsigned long arg)
199 struct proc_dir_entry *entry;
203 if (inode->i_ino < PROC_DYNAMIC_FIRST)
206 entry = PROC_I(inode)->pde;
212 /* fixme: if stealth, return -ENOTTY */
214 flags = entry->vx_flags;
215 if (capable(CAP_CONTEXT))
216 error = put_user(flags, (int *) arg);
220 /* fixme: if stealth, return -ENOTTY */
222 if (!capable(CAP_CONTEXT))
225 if (IS_RDONLY(inode))
228 if (get_user(flags, (int *) arg))
231 entry->vx_flags = flags;
242 int vx_parse_xid(char *string, xid_t *xid, int remove)
244 static match_table_t tokens = {
248 substring_t args[MAX_OPT_ARGS];
249 int token, option = 0;
254 token = match_token(string, tokens, args);
255 if (token && xid && !match_int(args, &option))
258 vxdprintk(VXD_CBIT(xid, 7),
259 "vx_parse_xid(»%s«): %d:#%d",
260 string, token, option);
262 if (token && remove) {
263 char *p = strstr(string, "xid=");
267 while (*q != '\0' && *q != ',')
278 void vx_propagate_xid(struct nameidata *nd, struct inode *inode)
281 struct vfsmount *mnt;
290 propagate = (mnt->mnt_flags & MNT_XID);
292 new_xid = mnt->mnt_xid;
294 vxdprintk(VXD_CBIT(xid, 7),
295 "vx_propagate_xid(%p[#%lu.%d]): %d,%d",
296 inode, inode->i_ino, inode->i_xid,
297 new_xid, (propagate)?1:0);
300 inode->i_xid = new_xid;
303 #include <linux/module.h>
305 EXPORT_SYMBOL_GPL(vx_propagate_xid);