mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
d0969d1949
Fix some unaligned accesses Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
368 lines
11 KiB
C
368 lines
11 KiB
C
/*
|
|
* linux/fs/hpfs/ea.c
|
|
*
|
|
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
|
|
*
|
|
* handling extended attributes
|
|
*/
|
|
|
|
#include "hpfs_fn.h"
|
|
|
|
/* Remove external extended attributes. ano specifies whether a is a
|
|
direct sector where eas starts or an anode */
|
|
|
|
void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len)
|
|
{
|
|
unsigned pos = 0;
|
|
while (pos < len) {
|
|
char ex[4 + 255 + 1 + 8];
|
|
struct extended_attribute *ea = (struct extended_attribute *)ex;
|
|
if (pos + 4 > len) {
|
|
hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
|
|
ano ? "anode" : "sectors", a, len);
|
|
return;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
|
|
if (ea->indirect) {
|
|
if (ea_valuelen(ea) != 8) {
|
|
hpfs_error(s, "ea->indirect set while ea->valuelen!=8, %s %08x, pos %08x",
|
|
ano ? "anode" : "sectors", a, pos);
|
|
return;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4))
|
|
return;
|
|
hpfs_ea_remove(s, ea_sec(ea), ea->anode, ea_len(ea));
|
|
}
|
|
pos += ea->namelen + ea_valuelen(ea) + 5;
|
|
}
|
|
if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9);
|
|
else {
|
|
struct buffer_head *bh;
|
|
struct anode *anode;
|
|
if ((anode = hpfs_map_anode(s, a, &bh))) {
|
|
hpfs_remove_btree(s, &anode->btree);
|
|
brelse(bh);
|
|
hpfs_free_sectors(s, a, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size)
|
|
{
|
|
char *ret;
|
|
if (!(ret = kmalloc(size + 1, GFP_NOFS))) {
|
|
printk("HPFS: out of memory for EA\n");
|
|
return NULL;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, 0, size, ret)) {
|
|
kfree(ret);
|
|
return NULL;
|
|
}
|
|
ret[size] = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void set_indirect_ea(struct super_block *s, int ano, secno a,
|
|
const char *data, int size)
|
|
{
|
|
hpfs_ea_write(s, a, ano, 0, size, data);
|
|
}
|
|
|
|
/* Read an extended attribute named 'key' into the provided buffer */
|
|
|
|
int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key,
|
|
char *buf, int size)
|
|
{
|
|
unsigned pos;
|
|
int ano, len;
|
|
secno a;
|
|
struct extended_attribute *ea;
|
|
struct extended_attribute *ea_end = fnode_end_ea(fnode);
|
|
for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect)
|
|
goto indirect;
|
|
if (ea_valuelen(ea) >= size)
|
|
return -EINVAL;
|
|
memcpy(buf, ea_data(ea), ea_valuelen(ea));
|
|
buf[ea_valuelen(ea)] = 0;
|
|
return 0;
|
|
}
|
|
a = le32_to_cpu(fnode->ea_secno);
|
|
len = le32_to_cpu(fnode->ea_size_l);
|
|
ano = fnode->ea_anode;
|
|
pos = 0;
|
|
while (pos < len) {
|
|
char ex[4 + 255 + 1 + 8];
|
|
ea = (struct extended_attribute *)ex;
|
|
if (pos + 4 > len) {
|
|
hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
|
|
ano ? "anode" : "sectors", a, len);
|
|
return -EIO;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO;
|
|
if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
|
|
return -EIO;
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect)
|
|
goto indirect;
|
|
if (ea_valuelen(ea) >= size)
|
|
return -EINVAL;
|
|
if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf))
|
|
return -EIO;
|
|
buf[ea_valuelen(ea)] = 0;
|
|
return 0;
|
|
}
|
|
pos += ea->namelen + ea_valuelen(ea) + 5;
|
|
}
|
|
return -ENOENT;
|
|
indirect:
|
|
if (ea_len(ea) >= size)
|
|
return -EINVAL;
|
|
if (hpfs_ea_read(s, ea_sec(ea), ea->anode, 0, ea_len(ea), buf))
|
|
return -EIO;
|
|
buf[ea_len(ea)] = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Read an extended attribute named 'key' */
|
|
char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size)
|
|
{
|
|
char *ret;
|
|
unsigned pos;
|
|
int ano, len;
|
|
secno a;
|
|
struct extended_attribute *ea;
|
|
struct extended_attribute *ea_end = fnode_end_ea(fnode);
|
|
for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect)
|
|
return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
|
|
if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
|
|
printk("HPFS: out of memory for EA\n");
|
|
return NULL;
|
|
}
|
|
memcpy(ret, ea_data(ea), ea_valuelen(ea));
|
|
ret[ea_valuelen(ea)] = 0;
|
|
return ret;
|
|
}
|
|
a = le32_to_cpu(fnode->ea_secno);
|
|
len = le32_to_cpu(fnode->ea_size_l);
|
|
ano = fnode->ea_anode;
|
|
pos = 0;
|
|
while (pos < len) {
|
|
char ex[4 + 255 + 1 + 8];
|
|
ea = (struct extended_attribute *)ex;
|
|
if (pos + 4 > len) {
|
|
hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
|
|
ano ? "anode" : "sectors", a, len);
|
|
return NULL;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL;
|
|
if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
|
|
return NULL;
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect)
|
|
return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
|
|
if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
|
|
printk("HPFS: out of memory for EA\n");
|
|
return NULL;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) {
|
|
kfree(ret);
|
|
return NULL;
|
|
}
|
|
ret[ea_valuelen(ea)] = 0;
|
|
return ret;
|
|
}
|
|
pos += ea->namelen + ea_valuelen(ea) + 5;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Update or create extended attribute 'key' with value 'data'. Note that
|
|
* when this ea exists, it MUST have the same size as size of data.
|
|
* This driver can't change sizes of eas ('cause I just don't need it).
|
|
*/
|
|
|
|
void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key,
|
|
const char *data, int size)
|
|
{
|
|
fnode_secno fno = inode->i_ino;
|
|
struct super_block *s = inode->i_sb;
|
|
unsigned pos;
|
|
int ano, len;
|
|
secno a;
|
|
unsigned char h[4];
|
|
struct extended_attribute *ea;
|
|
struct extended_attribute *ea_end = fnode_end_ea(fnode);
|
|
for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect) {
|
|
if (ea_len(ea) == size)
|
|
set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
|
|
} else if (ea_valuelen(ea) == size) {
|
|
memcpy(ea_data(ea), data, size);
|
|
}
|
|
return;
|
|
}
|
|
a = le32_to_cpu(fnode->ea_secno);
|
|
len = le32_to_cpu(fnode->ea_size_l);
|
|
ano = fnode->ea_anode;
|
|
pos = 0;
|
|
while (pos < len) {
|
|
char ex[4 + 255 + 1 + 8];
|
|
ea = (struct extended_attribute *)ex;
|
|
if (pos + 4 > len) {
|
|
hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
|
|
ano ? "anode" : "sectors", a, len);
|
|
return;
|
|
}
|
|
if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
|
|
if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
|
|
return;
|
|
if (!strcmp(ea->name, key)) {
|
|
if (ea->indirect) {
|
|
if (ea_len(ea) == size)
|
|
set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
|
|
}
|
|
else {
|
|
if (ea_valuelen(ea) == size)
|
|
hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data);
|
|
}
|
|
return;
|
|
}
|
|
pos += ea->namelen + ea_valuelen(ea) + 5;
|
|
}
|
|
if (!le16_to_cpu(fnode->ea_offs)) {
|
|
/*if (le16_to_cpu(fnode->ea_size_s)) {
|
|
hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0",
|
|
inode->i_ino, le16_to_cpu(fnode->ea_size_s));
|
|
return;
|
|
}*/
|
|
fnode->ea_offs = cpu_to_le16(0xc4);
|
|
}
|
|
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) {
|
|
hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x",
|
|
(unsigned long)inode->i_ino,
|
|
le32_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s));
|
|
return;
|
|
}
|
|
if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) &&
|
|
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) {
|
|
ea = fnode_end_ea(fnode);
|
|
*(char *)ea = 0;
|
|
ea->namelen = strlen(key);
|
|
ea->valuelen_lo = size;
|
|
ea->valuelen_hi = size >> 8;
|
|
strcpy(ea->name, key);
|
|
memcpy(ea_data(ea), data, size);
|
|
fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5);
|
|
goto ret;
|
|
}
|
|
/* Most the code here is 99.9993422% unused. I hope there are no bugs.
|
|
But what .. HPFS.IFS has also bugs in ea management. */
|
|
if (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) {
|
|
secno n;
|
|
struct buffer_head *bh;
|
|
char *data;
|
|
if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return;
|
|
if (!(data = hpfs_get_sector(s, n, &bh))) {
|
|
hpfs_free_sectors(s, n, 1);
|
|
return;
|
|
}
|
|
memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s));
|
|
fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s));
|
|
fnode->ea_size_s = cpu_to_le16(0);
|
|
fnode->ea_secno = cpu_to_le32(n);
|
|
fnode->ea_anode = cpu_to_le32(0);
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
}
|
|
pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size;
|
|
len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9;
|
|
if (pos >= 30000) goto bail;
|
|
while (((pos + 511) >> 9) > len) {
|
|
if (!len) {
|
|
secno q = hpfs_alloc_sector(s, fno, 1, 0);
|
|
if (!q) goto bail;
|
|
fnode->ea_secno = cpu_to_le32(q);
|
|
fnode->ea_anode = 0;
|
|
len++;
|
|
} else if (!fnode->ea_anode) {
|
|
if (hpfs_alloc_if_possible(s, le32_to_cpu(fnode->ea_secno) + len)) {
|
|
len++;
|
|
} else {
|
|
/* Aargh... don't know how to create ea anodes :-( */
|
|
/*struct buffer_head *bh;
|
|
struct anode *anode;
|
|
anode_secno a_s;
|
|
if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh)))
|
|
goto bail;
|
|
anode->up = cpu_to_le32(fno);
|
|
anode->btree.fnode_parent = 1;
|
|
anode->btree.n_free_nodes--;
|
|
anode->btree.n_used_nodes++;
|
|
anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12);
|
|
anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno));
|
|
anode->u.external[0].file_secno = cpu_to_le32(0);
|
|
anode->u.external[0].length = cpu_to_le32(len);
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
fnode->ea_anode = 1;
|
|
fnode->ea_secno = cpu_to_le32(a_s);*/
|
|
secno new_sec;
|
|
int i;
|
|
if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9))))
|
|
goto bail;
|
|
for (i = 0; i < len; i++) {
|
|
struct buffer_head *bh1, *bh2;
|
|
void *b1, *b2;
|
|
if (!(b1 = hpfs_map_sector(s, le32_to_cpu(fnode->ea_secno) + i, &bh1, len - i - 1))) {
|
|
hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
|
|
goto bail;
|
|
}
|
|
if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) {
|
|
brelse(bh1);
|
|
hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
|
|
goto bail;
|
|
}
|
|
memcpy(b2, b1, 512);
|
|
brelse(bh1);
|
|
mark_buffer_dirty(bh2);
|
|
brelse(bh2);
|
|
}
|
|
hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno), len);
|
|
fnode->ea_secno = cpu_to_le32(new_sec);
|
|
len = (pos + 511) >> 9;
|
|
}
|
|
}
|
|
if (fnode->ea_anode) {
|
|
if (hpfs_add_sector_to_btree(s, le32_to_cpu(fnode->ea_secno),
|
|
0, len) != -1) {
|
|
len++;
|
|
} else {
|
|
goto bail;
|
|
}
|
|
}
|
|
}
|
|
h[0] = 0;
|
|
h[1] = strlen(key);
|
|
h[2] = size & 0xff;
|
|
h[3] = size >> 8;
|
|
if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode->ea_anode, le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail;
|
|
if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode->ea_anode, le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail;
|
|
if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode->ea_anode, le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail;
|
|
fnode->ea_size_l = cpu_to_le32(pos);
|
|
ret:
|
|
hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size;
|
|
return;
|
|
bail:
|
|
if (le32_to_cpu(fnode->ea_secno))
|
|
if (fnode->ea_anode) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9);
|
|
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));
|
|
else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0);
|
|
}
|
|
|