1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* { dg-do compile } */
/* { dg-require-effective-target arm_hard_vfp_ok } */
/* { dg-options "-O2 -mapcs -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16" } */
int inode_permission (), try_break_deleg ();
int mutex_lock (), mutex_unlock ();
struct mutex
{
};
struct dentry
{
struct inode *d_inode;
};
struct inode
{
const struct inode_operations *i_op;
struct super_block *i_sb;
union
{
const unsigned int i_nlink;
};
unsigned long i_state;
struct mutex i_mutex;
};
struct super_block
{
unsigned int s_max_links;
};
struct inode_operations
{
int (*link) (struct dentry *, struct inode *, struct dentry *);
} __attribute__ ((__aligned__ ((1 << 6))));
static inline __attribute__ ((always_inline))
__attribute__ ((no_instrument_function))
int may_create (struct inode *dir, struct dentry *child)
{
if (child->d_inode)
return -17;
return inode_permission (dir, 0x00000002 | 0x00000001);
}
int
vfs_link (struct dentry *old_dentry, struct inode *dir,
struct dentry *new_dentry, struct inode **delegated_inode)
{
struct inode *inode = old_dentry->d_inode;
unsigned max_links = dir->i_sb->s_max_links;
int error;
error = may_create (dir, new_dentry);
if (error)
return error;
mutex_lock (&inode->i_mutex);
if (inode->i_nlink == 0 && !(inode->i_state & (1 << 10)))
error = -2;
else if (max_links && inode->i_nlink >= max_links)
error = -31;
else
{
error = try_break_deleg (inode, delegated_inode);
error = dir->i_op->link (old_dentry, dir, new_dentry);
}
mutex_unlock (&inode->i_mutex);
return error;
}
|
