- 根目录:
- fs
- hpfs
- ea.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(ea)) {
if (ea_valuelen(ea) != 8) {
hpfs_error(s, "ea_indirect(ea) 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_in_anode(ea), 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))) {
pr_err("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;
char ex[4 + 255 + 1 + 8];
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(ea))
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_in_anode(fnode);
pos = 0;
while (pos < len) {
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(ea) ? 8 : 0), ex + 4))
return -EIO;
if (!strcmp(ea->name, key)) {
if (ea_indirect(ea))
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_in_anode(ea), 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(ea))
return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea));
if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
pr_err("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_in_anode(fnode);
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(ea) ? 8 : 0), ex + 4))
return NULL;
if (!strcmp(ea->name, key)) {
if (ea_indirect(ea))
return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea));
if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) {
pr_err("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(ea)) {
if (ea_len(ea) == size)
set_indirect_ea(s, ea_in_anode(ea), 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_in_anode(fnode);
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(ea) ? 8 : 0), ex + 4))
return;
if (!strcmp(ea->name, key)) {
if (ea_indirect(ea)) {
if (ea_len(ea) == size)
set_indirect_ea(s, ea_in_anode(ea), 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,
le16_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->flags &= ~FNODE_anode;
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->flags &= ~FNODE_anode;
len++;
} else if (!fnode_in_anode(fnode)) {
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->flags |= FNODE_anode;
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_in_anode(fnode)) {
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_in_anode(fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail;
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;
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;
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_in_anode(fnode)) 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);
}