Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 06:31:52 +00:00
Code Issues Packages Projects Releases Wiki Activity
169e1a2a8a
linux/fs/openpromfs/inode.c
Arjan van de Ven 4b6f5d20b0 [PATCH] Make most file operations structs in fs/ const 
This is a conversion to make the various file_operations structs in fs/
const.  Basically a regexp job, with a few manual fixups

The goal is both to increase correctness (harder to accidentally write to
shared datastructures) and reducing the false sharing of cachelines with
things that get dirty in .data (while .rodata is nicely read only and thus
cache clean)

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:16:06 -08:00

1098 lines
25 KiB
C
Raw Blame History

/* $Id: inode.c,v 1.15 2001/11/12 09:43:39 davem Exp $
* openpromfs.c: /proc/openprom handling routines
*
* Copyright (C) 1996-1999 Jakub Jelinek (jakub@redhat.com)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/openprom_fs.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
#define ALIASES_NNODES 64
typedef struct {
u16 parent;
u16 next;
u16 child;
u16 first_prop;
u32 node;
} openpromfs_node;
typedef struct {
#define OPP_STRING 0x10
#define OPP_STRINGLIST 0x20
#define OPP_BINARY 0x40
#define OPP_HEXSTRING 0x80
#define OPP_DIRTY 0x01
#define OPP_QUOTED 0x02
#define OPP_NOTQUOTED 0x04
#define OPP_ASCIIZ 0x08
u32 flag;
u32 alloclen;
u32 len;
char *value;
char name[8];
} openprom_property;
static openpromfs_node *nodes;
static int alloced;
static u16 last_node;
static u16 first_prop;
static u16 options = 0xffff;
static u16 aliases = 0xffff;
static int aliases_nodes;
static char *alias_names [ALIASES_NNODES];
#define OPENPROM_ROOT_INO 16
#define OPENPROM_FIRST_INO OPENPROM_ROOT_INO
#define NODE(ino) nodes[ino - OPENPROM_FIRST_INO]
#define NODE2INO(node) (node + OPENPROM_FIRST_INO)
#define NODEP2INO(no) (no + OPENPROM_FIRST_INO + last_node)
static int openpromfs_create (struct inode *, struct dentry *, int, struct nameidata *);
static int openpromfs_readdir(struct file *, void *, filldir_t);
static struct dentry *openpromfs_lookup(struct inode *, struct dentry *dentry, struct nameidata *nd);
static int openpromfs_unlink (struct inode *, struct dentry *dentry);
static ssize_t nodenum_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct inode *inode = file->f_dentry->d_inode;
char buffer[10];
if (count < 0 || !inode->u.generic_ip)
return -EINVAL;
sprintf (buffer, "%8.8x\n", (u32)(long)(inode->u.generic_ip));
if (file->f_pos >= 9)
return 0;
if (count > 9 - file->f_pos)
count = 9 - file->f_pos;
if (copy_to_user(buf, buffer + file->f_pos, count))
return -EFAULT;
*ppos += count;
return count;
}
static ssize_t property_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
struct inode *inode = filp->f_dentry->d_inode;
int i, j, k;
u32 node;
char *p, *s;
u32 *q;
openprom_property *op;
char buffer[64];
if (!filp->private_data) {
node = nodes[(u16)((long)inode->u.generic_ip)].node;
i = ((u32)(long)inode->u.generic_ip) >> 16;
if ((u16)((long)inode->u.generic_ip) == aliases) {
if (i >= aliases_nodes)
p = NULL;
else
p = alias_names [i];
} else
for (p = prom_firstprop (node, buffer);
i && p && *p;
p = prom_nextprop (node, p, buffer), i--)
/* nothing */ ;
if (!p || !*p)
return -EIO;
i = prom_getproplen (node, p);
if (i < 0) {
if ((u16)((long)inode->u.generic_ip) == aliases)
i = 0;
else
return -EIO;
}
k = i;
if (i < 64) i = 64;
filp->private_data = kmalloc (sizeof (openprom_property)
+ (j = strlen (p)) + 2 * i,
GFP_KERNEL);
if (!filp->private_data)
return -ENOMEM;
op = (openprom_property *)filp->private_data;
op->flag = 0;
op->alloclen = 2 * i;
strcpy (op->name, p);
op->value = (char *)(((unsigned long)(op->name + j + 4)) & ~3);
op->len = k;
if (k && prom_getproperty (node, p, op->value, i) < 0)
return -EIO;
op->value [k] = 0;
if (k) {
for (s = NULL, p = op->value; p < op->value + k; p++) {
if ((*p >= ' ' && *p <= '~') || *p == '\n') {
op->flag |= OPP_STRING;
s = p;
continue;
}
if (p > op->value && !*p && s == p - 1) {
if (p < op->value + k - 1)
op->flag |= OPP_STRINGLIST;
else
op->flag |= OPP_ASCIIZ;
continue;
}
if (k == 1 && !*p) {
op->flag |= (OPP_STRING|OPP_ASCIIZ);
break;
}
op->flag &= ~(OPP_STRING|OPP_STRINGLIST);
if (k & 3)
op->flag |= OPP_HEXSTRING;
else
op->flag |= OPP_BINARY;
break;
}
if (op->flag & OPP_STRINGLIST)
op->flag &= ~(OPP_STRING);
if (op->flag & OPP_ASCIIZ)
op->len--;
}
} else
op = (openprom_property *)filp->private_data;
if (!count || !(op->len || (op->flag & OPP_ASCIIZ)))
return 0;
if (*ppos >= 0xffffff || count >= 0xffffff)
return -EINVAL;
if (op->flag & OPP_STRINGLIST) {
for (k = 0, p = op->value; p < op->value + op->len; p++)
if (!*p)
k++;
i = op->len + 4 * k + 3;
} else if (op->flag & OPP_STRING) {
i = op->len + 3;
} else if (op->flag & OPP_BINARY) {
i = (op->len * 9) >> 2;
} else {
i = (op->len << 1) + 1;
}
k = *ppos;
if (k >= i) return 0;
if (count > i - k) count = i - k;
if (op->flag & OPP_STRING) {
if (!k) {
if (put_user('\'', buf))
return -EFAULT;
k++;
count--;
}
if (k + count >= i - 2)
j = i - 2 - k;
else
j = count;
if (j >= 0) {
if (copy_to_user(buf + k - *ppos,
op->value + k - 1, j))
return -EFAULT;
count -= j;
k += j;
}
if (count) {
if (put_user('\'', &buf [k++ - *ppos]))
return -EFAULT;
}
if (count > 1) {
if (put_user('\n', &buf [k++ - *ppos]))
return -EFAULT;
}
} else if (op->flag & OPP_STRINGLIST) {
char *tmp;
tmp = kmalloc (i, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
s = tmp;
*s++ = '\'';
for (p = op->value; p < op->value + op->len; p++) {
if (!*p) {
strcpy(s, "' + '");
s += 5;
continue;
}
*s++ = *p;
}
strcpy(s, "'\n");
if (copy_to_user(buf, tmp + k, count))
return -EFAULT;
kfree(tmp);
k += count;
} else if (op->flag & OPP_BINARY) {
char buffer[10];
u32 *first, *last;
int first_off, last_cnt;
first = ((u32 *)op->value) + k / 9;
first_off = k % 9;
last = ((u32 *)op->value) + (k + count - 1) / 9;
last_cnt = (k + count) % 9;
if (!last_cnt) last_cnt = 9;
if (first == last) {
sprintf (buffer, "%08x.", *first);
if (copy_to_user(buf, buffer + first_off,
last_cnt - first_off))
return -EFAULT;
buf += last_cnt - first_off;
} else {
for (q = first; q <= last; q++) {
sprintf (buffer, "%08x.", *q);
if (q == first) {
if (copy_to_user(buf, buffer + first_off,
9 - first_off))
return -EFAULT;
buf += 9 - first_off;
} else if (q == last) {
if (copy_to_user(buf, buffer, last_cnt))
return -EFAULT;
buf += last_cnt;
} else {
if (copy_to_user(buf, buffer, 9))
return -EFAULT;
buf += 9;
}
}
}
if (last == (u32 *)(op->value + op->len - 4) && last_cnt == 9) {
if (put_user('\n', (buf - 1)))
return -EFAULT;
}
k += count;
} else if (op->flag & OPP_HEXSTRING) {
char buffer[3];
if ((k < i - 1) && (k & 1)) {
sprintf (buffer, "%02x",
(unsigned char) *(op->value + (k >> 1)) & 0xff);
if (put_user(buffer[1], &buf[k++ - *ppos]))
return -EFAULT;
count--;
}
for (; (count > 1) && (k < i - 1); k += 2) {
sprintf (buffer, "%02x",
(unsigned char) *(op->value + (k >> 1)) & 0xff);
if (copy_to_user(buf + k - *ppos, buffer, 2))
return -EFAULT;
count -= 2;
}
if (count && (k < i - 1)) {
sprintf (buffer, "%02x",
(unsigned char) *(op->value + (k >> 1)) & 0xff);
if (put_user(buffer[0], &buf[k++ - *ppos]))
return -EFAULT;
count--;
}
if (count) {
if (put_user('\n', &buf [k++ - *ppos]))
return -EFAULT;
}
}
count = k - *ppos;
*ppos = k;
return count;
}
static ssize_t property_write(struct file *filp, const char __user *buf,
size_t count, loff_t *ppos)
{
int i, j, k;
char *p;
u32 *q;
void *b;
openprom_property *op;
if (*ppos >= 0xffffff || count >= 0xffffff)
return -EINVAL;
if (!filp->private_data) {
i = property_read (filp, NULL, 0, NULL);
if (i)
return i;
}
k = *ppos;
op = (openprom_property *)filp->private_data;
if (!(op->flag & OPP_STRING)) {
u32 *first, *last;
int first_off, last_cnt;
u32 mask, mask2;
char tmp [9];
int forcelen = 0;
j = k % 9;
for (i = 0; i < count; i++, j++) {
if (j == 9) j = 0;
if (!j) {
char ctmp;
if (get_user(ctmp, &buf[i]))
return -EFAULT;
if (ctmp != '.') {
if (ctmp != '\n') {
if (op->flag & OPP_BINARY)
return -EINVAL;
else
goto write_try_string;
} else {
count = i + 1;
forcelen = 1;
break;
}
}
} else {
char ctmp;
if (get_user(ctmp, &buf[i]))
return -EFAULT;
if (ctmp < '0' ||
(ctmp > '9' && ctmp < 'A') ||
(ctmp > 'F' && ctmp < 'a') ||
ctmp > 'f') {
if (op->flag & OPP_BINARY)
return -EINVAL;
else
goto write_try_string;
}
}
}
op->flag |= OPP_BINARY;
tmp [8] = 0;
i = ((count + k + 8) / 9) << 2;
if (op->alloclen <= i) {
b = kmalloc (sizeof (openprom_property) + 2 * i,
GFP_KERNEL);
if (!b)
return -ENOMEM;
memcpy (b, filp->private_data,
sizeof (openprom_property)
+ strlen (op->name) + op->alloclen);
memset (((char *)b) + sizeof (openprom_property)
+ strlen (op->name) + op->alloclen,
0, 2 * i - op->alloclen);
op = (openprom_property *)b;
op->alloclen = 2*i;
b = filp->private_data;
filp->private_data = (void *)op;
kfree (b);
}
first = ((u32 *)op->value) + (k / 9);
first_off = k % 9;
last = (u32 *)(op->value + i);
last_cnt = (k + count) % 9;
if (first + 1 == last) {
memset (tmp, '0', 8);
if (copy_from_user(tmp + first_off, buf,
(count + first_off > 8) ?
8 - first_off : count))
return -EFAULT;
mask = 0xffffffff;
mask2 = 0xffffffff;
for (j = 0; j < first_off; j++)
mask >>= 1;
for (j = 8 - count - first_off; j > 0; j--)
mask2 <<= 1;
mask &= mask2;
if (mask) {
*first &= ~mask;
*first |= simple_strtoul (tmp, NULL, 16);
op->flag |= OPP_DIRTY;
}
} else {
op->flag |= OPP_DIRTY;
for (q = first; q < last; q++) {
if (q == first) {
if (first_off < 8) {
memset (tmp, '0', 8);
if (copy_from_user(tmp + first_off,
buf,
8 - first_off))
return -EFAULT;
mask = 0xffffffff;
for (j = 0; j < first_off; j++)
mask >>= 1;
*q &= ~mask;
*q |= simple_strtoul (tmp,NULL,16);
}
buf += 9;
} else if ((q == last - 1) && last_cnt
&& (last_cnt < 8)) {
memset (tmp, '0', 8);
if (copy_from_user(tmp, buf, last_cnt))
return -EFAULT;
mask = 0xffffffff;
for (j = 0; j < 8 - last_cnt; j++)
mask <<= 1;
*q &= ~mask;
*q |= simple_strtoul (tmp, NULL, 16);
buf += last_cnt;
} else {
char tchars[17]; /* XXX yuck... */
if (copy_from_user(tchars, buf, 16))
return -EFAULT;
*q = simple_strtoul (tchars, NULL, 16);
buf += 9;
}
}
}
if (!forcelen) {
if (op->len < i)
op->len = i;
} else
op->len = i;
*ppos += count;
}
write_try_string:
if (!(op->flag & OPP_BINARY)) {
if (!(op->flag & (OPP_QUOTED | OPP_NOTQUOTED))) {
char ctmp;
/* No way, if somebody starts writing from the middle,
* we don't know whether he uses quotes around or not
*/
if (k > 0)
return -EINVAL;
if (get_user(ctmp, buf))
return -EFAULT;
if (ctmp == '\'') {
op->flag |= OPP_QUOTED;
buf++;
count--;
(*ppos)++;
if (!count) {
op->flag |= OPP_STRING;
return 1;
}
} else
op->flag |= OPP_NOTQUOTED;
}
op->flag |= OPP_STRING;
if (op->alloclen <= count + *ppos) {
b = kmalloc (sizeof (openprom_property)
+ 2 * (count + *ppos), GFP_KERNEL);
if (!b)
return -ENOMEM;
memcpy (b, filp->private_data,
sizeof (openprom_property)
+ strlen (op->name) + op->alloclen);
memset (((char *)b) + sizeof (openprom_property)
+ strlen (op->name) + op->alloclen,
0, 2*(count - *ppos) - op->alloclen);
op = (openprom_property *)b;
op->alloclen = 2*(count + *ppos);
b = filp->private_data;
filp->private_data = (void *)op;
kfree (b);
}
p = op->value + *ppos - ((op->flag & OPP_QUOTED) ? 1 : 0);
if (copy_from_user(p, buf, count))
return -EFAULT;
op->flag |= OPP_DIRTY;
for (i = 0; i < count; i++, p++)
if (*p == '\n') {
*p = 0;
break;
}
if (i < count) {
op->len = p - op->value;
*ppos += i + 1;
if ((p > op->value) && (op->flag & OPP_QUOTED)
&& (*(p - 1) == '\''))
op->len--;
} else {
if (p - op->value > op->len)
op->len = p - op->value;
*ppos += count;
}
}
return *ppos - k;
}
int property_release (struct inode *inode, struct file *filp)
{
openprom_property *op = (openprom_property *)filp->private_data;
int error;
u32 node;
if (!op)
return 0;
lock_kernel();
node = nodes[(u16)((long)inode->u.generic_ip)].node;
if ((u16)((long)inode->u.generic_ip) == aliases) {
if ((op->flag & OPP_DIRTY) && (op->flag & OPP_STRING)) {
char *p = op->name;
int i = (op->value - op->name) - strlen (op->name) - 1;
op->value [op->len] = 0;
*(op->value - 1) = ' ';
if (i) {
for (p = op->value - i - 2; p >= op->name; p--)
p[i] = *p;
p = op->name + i;
}
memcpy (p - 8, "nvalias ", 8);
prom_feval (p - 8);
}
} else if (op->flag & OPP_DIRTY) {
if (op->flag & OPP_STRING) {
op->value [op->len] = 0;
error = prom_setprop (node, op->name,
op->value, op->len + 1);
if (error <= 0)
printk (KERN_WARNING "openpromfs: "
"Couldn't write property %s\n",
op->name);
} else if ((op->flag & OPP_BINARY) || !op->len) {
error = prom_setprop (node, op->name,
op->value, op->len);
if (error <= 0)
printk (KERN_WARNING "openpromfs: "
"Couldn't write property %s\n",
op->name);
} else {
printk (KERN_WARNING "openpromfs: "
"Unknown property type of %s\n",
op->name);
}
}
unlock_kernel();
kfree (filp->private_data);
return 0;
}
static const struct file_operations openpromfs_prop_ops = {
.read = property_read,
.write = property_write,
.release = property_release,
};
static const struct file_operations openpromfs_nodenum_ops = {
.read = nodenum_read,
};
static const struct file_operations openprom_operations = {
.read = generic_read_dir,
.readdir = openpromfs_readdir,
};
static struct inode_operations openprom_alias_inode_operations = {
.create = openpromfs_create,
.lookup = openpromfs_lookup,
.unlink = openpromfs_unlink,
};
static struct inode_operations openprom_inode_operations = {
.lookup = openpromfs_lookup,
};
static int lookup_children(u16 n, const char * name, int len)
{
int ret;
u16 node;
for (; n != 0xffff; n = nodes[n].next) {
node = nodes[n].child;
if (node != 0xffff) {
char buffer[128];
int i;
char *p;
while (node != 0xffff) {
if (prom_getname (nodes[node].node,
buffer, 128) >= 0) {
i = strlen (buffer);
if ((len == i)
&& !strncmp (buffer, name, len))
return NODE2INO(node);
p = strchr (buffer, '@');
if (p && (len == p - buffer)
&& !strncmp (buffer, name, len))
return NODE2INO(node);
}
node = nodes[node].next;
}
} else
continue;
ret = lookup_children (nodes[n].child, name, len);
if (ret) return ret;
}
return 0;
}
static struct dentry *openpromfs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
{
int ino = 0;
#define OPFSL_DIR 0
#define OPFSL_PROPERTY 1
#define OPFSL_NODENUM 2
int type = 0;
char buffer[128];
char *p;
const char *name;
u32 n;
u16 dirnode;
unsigned int len;
int i;
struct inode *inode;
char buffer2[64];
inode = NULL;
name = dentry->d_name.name;
len = dentry->d_name.len;
lock_kernel();
if (name [0] == '.' && len == 5 && !strncmp (name + 1, "node", 4)) {
ino = NODEP2INO(NODE(dir->i_ino).first_prop);
type = OPFSL_NODENUM;
}
if (!ino) {
u16 node = NODE(dir->i_ino).child;
while (node != 0xffff) {
if (prom_getname (nodes[node].node, buffer, 128) >= 0) {
i = strlen (buffer);
if (len == i && !strncmp (buffer, name, len)) {
ino = NODE2INO(node);
type = OPFSL_DIR;
break;
}
p = strchr (buffer, '@');
if (p && (len == p - buffer)
&& !strncmp (buffer, name, len)) {
ino = NODE2INO(node);
type = OPFSL_DIR;
break;
}
}
node = nodes[node].next;
}
}
n = NODE(dir->i_ino).node;
dirnode = dir->i_ino - OPENPROM_FIRST_INO;
if (!ino) {
int j = NODEP2INO(NODE(dir->i_ino).first_prop);
if (dirnode != aliases) {
for (p = prom_firstprop (n, buffer2);
p && *p;
p = prom_nextprop (n, p, buffer2)) {
j++;
if ((len == strlen (p))
&& !strncmp (p, name, len)) {
ino = j;
type = OPFSL_PROPERTY;
break;
}
}
} else {
int k;
for (k = 0; k < aliases_nodes; k++) {
j++;
if (alias_names [k]
&& (len == strlen (alias_names [k]))
&& !strncmp (alias_names [k], name, len)) {
ino = j;
type = OPFSL_PROPERTY;
break;
}
}
}
}
if (!ino) {
ino = lookup_children (NODE(dir->i_ino).child, name, len);
if (ino)
type = OPFSL_DIR;
else {
unlock_kernel();
return ERR_PTR(-ENOENT);
}
}
inode = iget (dir->i_sb, ino);
unlock_kernel();
if (!inode)
return ERR_PTR(-EINVAL);
switch (type) {
case OPFSL_DIR:
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (ino == OPENPROM_FIRST_INO + aliases) {
inode->i_mode |= S_IWUSR;
inode->i_op = &openprom_alias_inode_operations;
} else
inode->i_op = &openprom_inode_operations;
inode->i_fop = &openprom_operations;
inode->i_nlink = 2;
break;
case OPFSL_NODENUM:
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_fop = &openpromfs_nodenum_ops;
inode->i_nlink = 1;
inode->u.generic_ip = (void *)(long)(n);
break;
case OPFSL_PROPERTY:
if ((dirnode == options) && (len == 17)
&& !strncmp (name, "security-password", 17))
inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
else {
inode->i_mode = S_IFREG | S_IRUGO;
if (dirnode == options || dirnode == aliases) {
if (len != 4 || strncmp (name, "name", 4))
inode->i_mode |= S_IWUSR;
}
}
inode->i_fop = &openpromfs_prop_ops;
inode->i_nlink = 1;
if (inode->i_size < 0)
inode->i_size = 0;
inode->u.generic_ip = (void *)(long)(((u16)dirnode) |
(((u16)(ino - NODEP2INO(NODE(dir->i_ino).first_prop) - 1)) << 16));
break;
}
inode->i_gid = 0;
inode->i_uid = 0;
d_add(dentry, inode);
return NULL;
}
static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
struct inode *inode = filp->f_dentry->d_inode;
unsigned int ino;
u32 n;
int i, j;
char buffer[128];
u16 node;
char *p;
char buffer2[64];
lock_kernel();
ino = inode->i_ino;
i = filp->f_pos;
switch (i) {
case 0:
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) goto out;
i++;
filp->f_pos++;
/* fall thru */
case 1:
if (filldir(dirent, "..", 2, i,
(NODE(ino).parent == 0xffff) ?
OPENPROM_ROOT_INO : NODE2INO(NODE(ino).parent), DT_DIR) < 0)
goto out;
i++;
filp->f_pos++;
/* fall thru */
default:
i -= 2;
node = NODE(ino).child;
while (i && node != 0xffff) {
node = nodes[node].next;
i--;
}
while (node != 0xffff) {
if (prom_getname (nodes[node].node, buffer, 128) < 0)
goto out;
if (filldir(dirent, buffer, strlen(buffer),
filp->f_pos, NODE2INO(node), DT_DIR) < 0)
goto out;
filp->f_pos++;
node = nodes[node].next;
}
j = NODEP2INO(NODE(ino).first_prop);
if (!i) {
if (filldir(dirent, ".node", 5, filp->f_pos, j, DT_REG) < 0)
goto out;
filp->f_pos++;
} else
i--;
n = NODE(ino).node;
if (ino == OPENPROM_FIRST_INO + aliases) {
for (j++; i < aliases_nodes; i++, j++) {
if (alias_names [i]) {
if (filldir (dirent, alias_names [i],
strlen (alias_names [i]),
filp->f_pos, j, DT_REG) < 0) goto out;
filp->f_pos++;
}
}
} else {
for (p = prom_firstprop (n, buffer2);
p && *p;
p = prom_nextprop (n, p, buffer2)) {
j++;
if (i) i--;
else {
if (filldir(dirent, p, strlen(p),
filp->f_pos, j, DT_REG) < 0)
goto out;
filp->f_pos++;
}
}
}
}
out:
unlock_kernel();
return 0;
}
static int openpromfs_create (struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
char *p;
struct inode *inode;
if (!dir)
return -ENOENT;
if (dentry->d_name.len > 256)
return -EINVAL;
p = kmalloc (dentry->d_name.len + 1, GFP_KERNEL);
if (!p)
return -ENOMEM;
strncpy (p, dentry->d_name.name, dentry->d_name.len);
p [dentry->d_name.len] = 0;
lock_kernel();
if (aliases_nodes == ALIASES_NNODES) {
kfree(p);
unlock_kernel();
return -EIO;
}
alias_names [aliases_nodes++] = p;
inode = iget (dir->i_sb,
NODEP2INO(NODE(dir->i_ino).first_prop) + aliases_nodes);
if (!inode) {
unlock_kernel();
return -EINVAL;
}
inode->i_mode = S_IFREG | S_IRUGO | S_IWUSR;
inode->i_fop = &openpromfs_prop_ops;
inode->i_nlink = 1;
if (inode->i_size < 0) inode->i_size = 0;
inode->u.generic_ip = (void *)(long)(((u16)aliases) |
(((u16)(aliases_nodes - 1)) << 16));
unlock_kernel();
d_instantiate(dentry, inode);
return 0;
}
static int openpromfs_unlink (struct inode *dir, struct dentry *dentry)
{
unsigned int len;
char *p;
const char *name;
int i;
name = dentry->d_name.name;
len = dentry->d_name.len;
lock_kernel();
for (i = 0; i < aliases_nodes; i++)
if ((strlen (alias_names [i]) == len)
&& !strncmp (name, alias_names[i], len)) {
char buffer[512];
p = alias_names [i];
alias_names [i] = NULL;
kfree (p);
strcpy (buffer, "nvunalias ");
memcpy (buffer + 10, name, len);
buffer [10 + len] = 0;
prom_feval (buffer);
}
unlock_kernel();
return 0;
}
/* {{{ init section */
static int __init check_space (u16 n)
{
unsigned long pages;
if ((1 << alloced) * PAGE_SIZE < (n + 2) * sizeof(openpromfs_node)) {
pages = __get_free_pages (GFP_KERNEL, alloced + 1);
if (!pages)
return -1;
if (nodes) {
memcpy ((char *)pages, (char *)nodes,
(1 << alloced) * PAGE_SIZE);
free_pages ((unsigned long)nodes, alloced);
}
alloced++;
nodes = (openpromfs_node *)pages;
}
return 0;
}
static u16 __init get_nodes (u16 parent, u32 node)
{
char *p;
u16 n = last_node++, i;
char buffer[64];
if (check_space (n) < 0)
return 0xffff;
nodes[n].parent = parent;
nodes[n].node = node;
nodes[n].next = 0xffff;
nodes[n].child = 0xffff;
nodes[n].first_prop = first_prop++;
if (!parent) {
char buffer[8];
int j;
if ((j = prom_getproperty (node, "name", buffer, 8)) >= 0) {
buffer[j] = 0;
if (!strcmp (buffer, "options"))
options = n;
else if (!strcmp (buffer, "aliases"))
aliases = n;
}
}
if (n != aliases)
for (p = prom_firstprop (node, buffer);
p && p != (char *)-1 && *p;
p = prom_nextprop (node, p, buffer))
first_prop++;
else {
char *q;
for (p = prom_firstprop (node, buffer);
p && p != (char *)-1 && *p;
p = prom_nextprop (node, p, buffer)) {
if (aliases_nodes == ALIASES_NNODES)
break;
for (i = 0; i < aliases_nodes; i++)
if (!strcmp (p, alias_names [i]))
break;
if (i < aliases_nodes)
continue;
q = kmalloc (strlen (p) + 1, GFP_KERNEL);
if (!q)
return 0xffff;
strcpy (q, p);
alias_names [aliases_nodes++] = q;
}
first_prop += ALIASES_NNODES;
}
node = prom_getchild (node);
if (node) {
parent = get_nodes (n, node);
if (parent == 0xffff)
return 0xffff;
nodes[n].child = parent;
while ((node = prom_getsibling (node)) != 0) {
i = get_nodes (n, node);
if (i == 0xffff)
return 0xffff;
nodes[parent].next = i;
parent = i;
}
}
return n;
}
static void openprom_read_inode(struct inode * inode)
{
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
if (inode->i_ino == OPENPROM_ROOT_INO) {
inode->i_op = &openprom_inode_operations;
inode->i_fop = &openprom_operations;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
}
}
static int openprom_remount(struct super_block *sb, int *flags, char *data)
{
*flags |= MS_NOATIME;
return 0;
}
static struct super_operations openprom_sops = {
.read_inode = openprom_read_inode,
.statfs = simple_statfs,
.remount_fs = openprom_remount,
};
static int openprom_fill_super(struct super_block *s, void *data, int silent)
{
struct inode * root_inode;
s->s_flags |= MS_NOATIME;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = OPENPROM_SUPER_MAGIC;
s->s_op = &openprom_sops;
s->s_time_gran = 1;
root_inode = iget(s, OPENPROM_ROOT_INO);
if (!root_inode)
goto out_no_root;
s->s_root = d_alloc_root(root_inode);
if (!s->s_root)
goto out_no_root;
return 0;
out_no_root:
printk("openprom_fill_super: get root inode failed\n");
iput(root_inode);
return -ENOMEM;
}
static struct super_block *openprom_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_single(fs_type, flags, data, openprom_fill_super);
}
static struct file_system_type openprom_fs_type = {
.owner = THIS_MODULE,
.name = "openpromfs",
.get_sb = openprom_get_sb,
.kill_sb = kill_anon_super,
};
static int __init init_openprom_fs(void)
{
nodes = (openpromfs_node *)__get_free_pages(GFP_KERNEL, 0);
if (!nodes) {
printk (KERN_WARNING "openpromfs: can't get free page\n");
return -EIO;
}
if (get_nodes (0xffff, prom_root_node) == 0xffff) {
printk (KERN_WARNING "openpromfs: couldn't setup tree\n");
return -EIO;
}
nodes[last_node].first_prop = first_prop;
return register_filesystem(&openprom_fs_type);
}
static void __exit exit_openprom_fs(void)
{
int i;
unregister_filesystem(&openprom_fs_type);
free_pages ((unsigned long)nodes, alloced);
for (i = 0; i < aliases_nodes; i++)
kfree (alias_names [i]);
nodes = NULL;
}
module_init(init_openprom_fs)
module_exit(exit_openprom_fs)
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink