^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* inode.c: /proc/openprom handling routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1996-1999 Jakub Jelinek (jakub@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/magic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/openprom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static DEFINE_MUTEX(op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define OPENPROM_ROOT_INO 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) enum op_inode_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) op_inode_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) op_inode_prop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) union op_inode_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct op_inode_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct inode vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) enum op_inode_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) union op_inode_data u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static inline struct op_inode_info *OP_I(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return container_of(inode, struct op_inode_info, vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int is_string(unsigned char *p, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) for (i = 0; i < len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned char val = p[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if ((i && !val) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) (val >= ' ' && val <= '~'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static int property_show(struct seq_file *f, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct property *prop = f->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void *pval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) len = prop->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pval = prop->value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (is_string(pval, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) while (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int n = strlen(pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) seq_printf(f, "%s", (char *) pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* Skip over the NULL byte too. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) pval += n + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) len -= n + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (len > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) seq_printf(f, " + ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (len & 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) while (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) seq_printf(f, "%02x.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *(unsigned char *) pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) seq_printf(f, "%02x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *(unsigned char *) pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pval++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) while (len >= 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) len -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) seq_printf(f, "%08x.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) *(unsigned int *) pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) seq_printf(f, "%08x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) *(unsigned int *) pval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) pval += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) seq_printf(f, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static void *property_start(struct seq_file *f, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (*pos == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void *property_next(struct seq_file *f, void *v, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) (*pos)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static void property_stop(struct seq_file *f, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* Nothing to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static const struct seq_operations property_op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .start = property_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .next = property_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .stop = property_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .show = property_show
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int property_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct op_inode_info *oi = OP_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) BUG_ON(oi->type != op_inode_prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ret = seq_open(file, &property_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct seq_file *m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) m->private = oi->u.prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static const struct file_operations openpromfs_prop_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .open = property_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .release = seq_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int openpromfs_readdir(struct file *, struct dir_context *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static const struct file_operations openprom_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .read = generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .iterate_shared = openpromfs_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static const struct inode_operations openprom_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) .lookup = openpromfs_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct op_inode_info *ent_oi, *oi = OP_I(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct device_node *dp, *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) enum op_inode_type ent_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) union op_inode_data ent_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unsigned int ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) BUG_ON(oi->type != op_inode_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) dp = oi->u.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) name = dentry->d_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) len = dentry->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mutex_lock(&op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) child = dp->child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) while (child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) const char *node_name = kbasename(child->full_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int n = strlen(node_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (len == n &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) !strncmp(node_name, name, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) ent_type = op_inode_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ent_data.node = child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) ino = child->unique_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) child = child->sibling;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) prop = dp->properties;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) while (prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int n = strlen(prop->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (len == n && !strncmp(prop->name, name, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ent_type = op_inode_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ent_data.prop = prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ino = prop->unique_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) prop = prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) mutex_unlock(&op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) inode = openprom_iget(dir->i_sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) mutex_unlock(&op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return ERR_CAST(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ent_oi = OP_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) ent_oi->type = ent_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) ent_oi->u = ent_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) switch (ent_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) case op_inode_node:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) inode->i_op = &openprom_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) inode->i_fop = &openprom_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) case op_inode_prop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (of_node_name_eq(dp, "options") && (len == 17) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) !strncmp (name, "security-password", 17))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) inode->i_mode = S_IFREG | S_IRUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) inode->i_fop = &openpromfs_prop_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) set_nlink(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) inode->i_size = ent_oi->u.prop->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static int openpromfs_readdir(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct op_inode_info *oi = OP_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct device_node *dp = oi->u.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct device_node *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mutex_lock(&op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (ctx->pos == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ctx->pos = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (ctx->pos == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!dir_emit(ctx, "..", 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) (dp->parent == NULL ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) OPENPROM_ROOT_INO :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) dp->parent->unique_id), DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) ctx->pos = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) i = ctx->pos - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /* First, the children nodes as directories. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) child = dp->child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) while (i && child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) child = child->sibling;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) while (child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (!dir_emit(ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) kbasename(child->full_name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) strlen(kbasename(child->full_name)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) child->unique_id, DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) child = child->sibling;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Next, the properties as files. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) prop = dp->properties;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) while (i && prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) prop = prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) while (prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (!dir_emit(ctx, prop->name, strlen(prop->name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) prop->unique_id, DT_REG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) prop = prop->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) mutex_unlock(&op_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static struct kmem_cache *op_inode_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static struct inode *openprom_alloc_inode(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) struct op_inode_info *oi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (!oi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return &oi->vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static void openprom_free_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) kmem_cache_free(op_inode_cachep, OP_I(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) inode = iget_locked(sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (inode->i_state & I_NEW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (inode->i_ino == OPENPROM_ROOT_INO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) inode->i_op = &openprom_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) inode->i_fop = &openprom_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) static int openprom_remount(struct super_block *sb, int *flags, char *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) sync_filesystem(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) *flags |= SB_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) static const struct super_operations openprom_sops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) .alloc_inode = openprom_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) .free_inode = openprom_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) .statfs = simple_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) .remount_fs = openprom_remount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static int openprom_fill_super(struct super_block *s, struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct inode *root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct op_inode_info *oi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) s->s_flags |= SB_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) s->s_blocksize = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) s->s_blocksize_bits = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) s->s_magic = OPENPROM_SUPER_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) s->s_op = &openprom_sops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) s->s_time_gran = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (IS_ERR(root_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) ret = PTR_ERR(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto out_no_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) oi = OP_I(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) oi->type = op_inode_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) oi->u.node = of_find_node_by_path("/");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) s->s_root = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (!s->s_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) goto out_no_root_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) out_no_root_dentry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) out_no_root:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) printk("openprom_fill_super: get root inode failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static int openpromfs_get_tree(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return get_tree_single(fc, openprom_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static const struct fs_context_operations openpromfs_context_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) .get_tree = openpromfs_get_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) static int openpromfs_init_fs_context(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) fc->ops = &openpromfs_context_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static struct file_system_type openprom_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) .name = "openpromfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) .init_fs_context = openpromfs_init_fs_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) .kill_sb = kill_anon_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) MODULE_ALIAS_FS("openpromfs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) static void op_inode_init_once(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct op_inode_info *oi = (struct op_inode_info *) data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) inode_init_once(&oi->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) static int __init init_openprom_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) op_inode_cachep = kmem_cache_create("op_inode_cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) sizeof(struct op_inode_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) (SLAB_RECLAIM_ACCOUNT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) SLAB_MEM_SPREAD | SLAB_ACCOUNT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) op_inode_init_once);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (!op_inode_cachep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) err = register_filesystem(&openprom_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) kmem_cache_destroy(op_inode_cachep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static void __exit exit_openprom_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) unregister_filesystem(&openprom_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * Make sure all delayed rcu free inodes are flushed before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * destroy cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) kmem_cache_destroy(op_inode_cachep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) module_init(init_openprom_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) module_exit(exit_openprom_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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