diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/openpromfs | |
download | linux-next-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/openpromfs')
-rw-r--r-- | fs/openpromfs/Makefile | 7 | ||||
-rw-r--r-- | fs/openpromfs/inode.c | 1098 |
2 files changed, 1105 insertions, 0 deletions
diff --git a/fs/openpromfs/Makefile b/fs/openpromfs/Makefile new file mode 100644 index 000000000000..4563199b8fe6 --- /dev/null +++ b/fs/openpromfs/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the Linux Sun Openprom filesystem routines. +# + +obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs.o + +openpromfs-objs := inode.o diff --git a/fs/openpromfs/inode.c b/fs/openpromfs/inode.c new file mode 100644 index 000000000000..1be11ce96b0f --- /dev/null +++ b/fs/openpromfs/inode.c @@ -0,0 +1,1098 @@ +/* $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 struct file_operations openpromfs_prop_ops = { + .read = property_read, + .write = property_write, + .release = property_release, +}; + +static struct file_operations openpromfs_nodenum_ops = { + .read = nodenum_read, +}; + +static 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++) + if (alias_names [i]) + kfree (alias_names [i]); + nodes = NULL; +} + +module_init(init_openprom_fs) +module_exit(exit_openprom_fs) +MODULE_LICENSE("GPL"); |