369 lines
11 KiB
C
369 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/hpfs/ea.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* handling extended attributes
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*/
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#include "hpfs_fn.h"
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/* Remove external extended attributes. ano specifies whether a is a
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direct sector where eas starts or an anode */
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void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len)
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{
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unsigned pos = 0;
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while (pos < len) {
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char ex[4 + 255 + 1 + 8];
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struct extended_attribute *ea = (struct extended_attribute *)ex;
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if (pos + 4 > len) {
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hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
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ano ? "anode" : "sectors", a, len);
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return;
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}
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if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
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if (ea_indirect(ea)) {
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if (ea_valuelen(ea) != 8) {
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hpfs_error(s, "ea_indirect(ea) set while ea->valuelen!=8, %s %08x, pos %08x",
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ano ? "anode" : "sectors", a, pos);
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return;
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}
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if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4))
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return;
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hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea));
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}
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pos += ea->namelen + ea_valuelen(ea) + 5;
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}
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if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9);
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else {
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struct buffer_head *bh;
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struct anode *anode;
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if ((anode = hpfs_map_anode(s, a, &bh))) {
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hpfs_remove_btree(s, &anode->btree);
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brelse(bh);
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hpfs_free_sectors(s, a, 1);
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}
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}
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}
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static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size)
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{
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char *ret;
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if (!(ret = kmalloc(size + 1, GFP_NOFS))) {
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pr_err("out of memory for EA\n");
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return NULL;
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}
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if (hpfs_ea_read(s, a, ano, 0, size, ret)) {
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kfree(ret);
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return NULL;
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}
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ret[size] = 0;
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return ret;
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}
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static void set_indirect_ea(struct super_block *s, int ano, secno a,
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const char *data, int size)
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{
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hpfs_ea_write(s, a, ano, 0, size, data);
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}
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/* Read an extended attribute named 'key' into the provided buffer */
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int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key,
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char *buf, int size)
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{
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unsigned pos;
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int ano, len;
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secno a;
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char ex[4 + 255 + 1 + 8];
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struct extended_attribute *ea;
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struct extended_attribute *ea_end = fnode_end_ea(fnode);
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for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea))
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goto indirect;
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if (ea_valuelen(ea) >= size)
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return -EINVAL;
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memcpy(buf, ea_data(ea), ea_valuelen(ea));
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buf[ea_valuelen(ea)] = 0;
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return 0;
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}
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a = le32_to_cpu(fnode->ea_secno);
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len = le32_to_cpu(fnode->ea_size_l);
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ano = fnode_in_anode(fnode);
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pos = 0;
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while (pos < len) {
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ea = (struct extended_attribute *)ex;
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if (pos + 4 > len) {
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hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
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ano ? "anode" : "sectors", a, len);
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return -EIO;
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}
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if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO;
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if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4))
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return -EIO;
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea))
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goto indirect;
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if (ea_valuelen(ea) >= size)
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return -EINVAL;
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if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf))
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return -EIO;
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buf[ea_valuelen(ea)] = 0;
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return 0;
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}
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pos += ea->namelen + ea_valuelen(ea) + 5;
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}
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return -ENOENT;
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indirect:
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if (ea_len(ea) >= size)
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return -EINVAL;
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if (hpfs_ea_read(s, ea_sec(ea), ea_in_anode(ea), 0, ea_len(ea), buf))
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return -EIO;
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buf[ea_len(ea)] = 0;
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return 0;
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}
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/* Read an extended attribute named 'key' */
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char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size)
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{
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char *ret;
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unsigned pos;
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int ano, len;
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secno a;
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struct extended_attribute *ea;
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struct extended_attribute *ea_end = fnode_end_ea(fnode);
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for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea))
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return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea));
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if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
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pr_err("out of memory for EA\n");
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return NULL;
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}
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memcpy(ret, ea_data(ea), ea_valuelen(ea));
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ret[ea_valuelen(ea)] = 0;
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return ret;
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}
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a = le32_to_cpu(fnode->ea_secno);
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len = le32_to_cpu(fnode->ea_size_l);
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ano = fnode_in_anode(fnode);
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pos = 0;
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while (pos < len) {
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char ex[4 + 255 + 1 + 8];
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ea = (struct extended_attribute *)ex;
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if (pos + 4 > len) {
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hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
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ano ? "anode" : "sectors", a, len);
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return NULL;
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}
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if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL;
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if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4))
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return NULL;
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea))
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return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea));
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if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
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pr_err("out of memory for EA\n");
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return NULL;
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}
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if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) {
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kfree(ret);
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return NULL;
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}
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ret[ea_valuelen(ea)] = 0;
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return ret;
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}
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pos += ea->namelen + ea_valuelen(ea) + 5;
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}
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return NULL;
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}
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/*
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* Update or create extended attribute 'key' with value 'data'. Note that
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* when this ea exists, it MUST have the same size as size of data.
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* This driver can't change sizes of eas ('cause I just don't need it).
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*/
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void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key,
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const char *data, int size)
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{
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fnode_secno fno = inode->i_ino;
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struct super_block *s = inode->i_sb;
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unsigned pos;
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int ano, len;
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secno a;
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unsigned char h[4];
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struct extended_attribute *ea;
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struct extended_attribute *ea_end = fnode_end_ea(fnode);
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for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea)) {
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if (ea_len(ea) == size)
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set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size);
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} else if (ea_valuelen(ea) == size) {
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memcpy(ea_data(ea), data, size);
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}
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return;
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}
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a = le32_to_cpu(fnode->ea_secno);
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len = le32_to_cpu(fnode->ea_size_l);
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ano = fnode_in_anode(fnode);
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pos = 0;
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while (pos < len) {
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char ex[4 + 255 + 1 + 8];
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ea = (struct extended_attribute *)ex;
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if (pos + 4 > len) {
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hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
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ano ? "anode" : "sectors", a, len);
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return;
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}
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if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
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if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4))
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return;
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if (!strcmp(ea->name, key)) {
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if (ea_indirect(ea)) {
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if (ea_len(ea) == size)
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set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size);
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}
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else {
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if (ea_valuelen(ea) == size)
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hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data);
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}
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return;
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}
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pos += ea->namelen + ea_valuelen(ea) + 5;
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}
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if (!le16_to_cpu(fnode->ea_offs)) {
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/*if (le16_to_cpu(fnode->ea_size_s)) {
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hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0",
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inode->i_ino, le16_to_cpu(fnode->ea_size_s));
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return;
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}*/
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fnode->ea_offs = cpu_to_le16(0xc4);
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}
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if (le16_to_cpu(fnode->ea_offs) < 0xc4 || le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200) {
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hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x",
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(unsigned long)inode->i_ino,
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le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s));
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return;
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}
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if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) &&
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le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5 <= 0x200) {
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ea = fnode_end_ea(fnode);
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*(char *)ea = 0;
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ea->namelen = strlen(key);
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ea->valuelen_lo = size;
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ea->valuelen_hi = size >> 8;
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strcpy(ea->name, key);
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memcpy(ea_data(ea), data, size);
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fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5);
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goto ret;
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}
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/* Most the code here is 99.9993422% unused. I hope there are no bugs.
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But what .. HPFS.IFS has also bugs in ea management. */
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if (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) {
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secno n;
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struct buffer_head *bh;
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char *data;
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if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return;
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if (!(data = hpfs_get_sector(s, n, &bh))) {
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hpfs_free_sectors(s, n, 1);
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return;
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}
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memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s));
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fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s));
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fnode->ea_size_s = cpu_to_le16(0);
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fnode->ea_secno = cpu_to_le32(n);
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fnode->flags &= ~FNODE_anode;
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mark_buffer_dirty(bh);
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brelse(bh);
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}
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pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size;
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len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9;
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if (pos >= 30000) goto bail;
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while (((pos + 511) >> 9) > len) {
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if (!len) {
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secno q = hpfs_alloc_sector(s, fno, 1, 0);
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if (!q) goto bail;
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fnode->ea_secno = cpu_to_le32(q);
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fnode->flags &= ~FNODE_anode;
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len++;
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} else if (!fnode_in_anode(fnode)) {
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if (hpfs_alloc_if_possible(s, le32_to_cpu(fnode->ea_secno) + len)) {
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len++;
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} else {
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/* Aargh... don't know how to create ea anodes :-( */
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/*struct buffer_head *bh;
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struct anode *anode;
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anode_secno a_s;
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if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh)))
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goto bail;
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anode->up = cpu_to_le32(fno);
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anode->btree.fnode_parent = 1;
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anode->btree.n_free_nodes--;
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anode->btree.n_used_nodes++;
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anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12);
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anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno));
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anode->u.external[0].file_secno = cpu_to_le32(0);
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anode->u.external[0].length = cpu_to_le32(len);
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mark_buffer_dirty(bh);
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brelse(bh);
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fnode->flags |= FNODE_anode;
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fnode->ea_secno = cpu_to_le32(a_s);*/
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secno new_sec;
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int i;
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if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9))))
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goto bail;
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for (i = 0; i < len; i++) {
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struct buffer_head *bh1, *bh2;
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void *b1, *b2;
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if (!(b1 = hpfs_map_sector(s, le32_to_cpu(fnode->ea_secno) + i, &bh1, len - i - 1))) {
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hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
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goto bail;
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}
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if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) {
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brelse(bh1);
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hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
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goto bail;
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}
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memcpy(b2, b1, 512);
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brelse(bh1);
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mark_buffer_dirty(bh2);
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brelse(bh2);
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}
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hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno), len);
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fnode->ea_secno = cpu_to_le32(new_sec);
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len = (pos + 511) >> 9;
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}
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}
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if (fnode_in_anode(fnode)) {
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if (hpfs_add_sector_to_btree(s, le32_to_cpu(fnode->ea_secno),
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0, len) != -1) {
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len++;
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} else {
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goto bail;
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}
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}
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}
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h[0] = 0;
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h[1] = strlen(key);
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h[2] = size & 0xff;
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h[3] = size >> 8;
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if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail;
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if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail;
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if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail;
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fnode->ea_size_l = cpu_to_le32(pos);
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ret:
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hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size;
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return;
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bail:
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if (le32_to_cpu(fnode->ea_secno))
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if (fnode_in_anode(fnode)) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9);
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else hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno) + ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9), len - ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9));
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else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0);
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}
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