mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 07:09:02 +07:00
0125f504ed
The adfs_dir_ops structures are never modified, so declare them as const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
266 lines
6.2 KiB
C
266 lines
6.2 KiB
C
/*
|
|
* linux/fs/adfs/dir_fplus.c
|
|
*
|
|
* Copyright (C) 1997-1999 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/slab.h>
|
|
#include "adfs.h"
|
|
#include "dir_fplus.h"
|
|
|
|
static int
|
|
adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
|
|
{
|
|
struct adfs_bigdirheader *h;
|
|
struct adfs_bigdirtail *t;
|
|
unsigned long block;
|
|
unsigned int blk, size;
|
|
int i, ret = -EIO;
|
|
|
|
dir->nr_buffers = 0;
|
|
|
|
/* start off using fixed bh set - only alloc for big dirs */
|
|
dir->bh_fplus = &dir->bh[0];
|
|
|
|
block = __adfs_block_map(sb, id, 0);
|
|
if (!block) {
|
|
adfs_error(sb, "dir object %X has a hole at offset 0", id);
|
|
goto out;
|
|
}
|
|
|
|
dir->bh_fplus[0] = sb_bread(sb, block);
|
|
if (!dir->bh_fplus[0])
|
|
goto out;
|
|
dir->nr_buffers += 1;
|
|
|
|
h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data;
|
|
size = le32_to_cpu(h->bigdirsize);
|
|
if (size != sz) {
|
|
printk(KERN_WARNING "adfs: adfs_fplus_read:"
|
|
" directory header size %X\n"
|
|
" does not match directory size %X\n",
|
|
size, sz);
|
|
}
|
|
|
|
if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
|
|
h->bigdirversion[2] != 0 || size & 2047 ||
|
|
h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
|
|
printk(KERN_WARNING "adfs: dir object %X has"
|
|
" malformed dir header\n", id);
|
|
goto out;
|
|
}
|
|
|
|
size >>= sb->s_blocksize_bits;
|
|
if (size > ARRAY_SIZE(dir->bh)) {
|
|
/* this directory is too big for fixed bh set, must allocate */
|
|
struct buffer_head **bh_fplus =
|
|
kcalloc(size, sizeof(struct buffer_head *),
|
|
GFP_KERNEL);
|
|
if (!bh_fplus) {
|
|
ret = -ENOMEM;
|
|
adfs_error(sb, "not enough memory for"
|
|
" dir object %X (%d blocks)", id, size);
|
|
goto out;
|
|
}
|
|
dir->bh_fplus = bh_fplus;
|
|
/* copy over the pointer to the block that we've already read */
|
|
dir->bh_fplus[0] = dir->bh[0];
|
|
}
|
|
|
|
for (blk = 1; blk < size; blk++) {
|
|
block = __adfs_block_map(sb, id, blk);
|
|
if (!block) {
|
|
adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
|
|
goto out;
|
|
}
|
|
|
|
dir->bh_fplus[blk] = sb_bread(sb, block);
|
|
if (!dir->bh_fplus[blk]) {
|
|
adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX",
|
|
id, blk, block);
|
|
goto out;
|
|
}
|
|
|
|
dir->nr_buffers += 1;
|
|
}
|
|
|
|
t = (struct adfs_bigdirtail *)
|
|
(dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8));
|
|
|
|
if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
|
|
t->bigdirendmasseq != h->startmasseq ||
|
|
t->reserved[0] != 0 || t->reserved[1] != 0) {
|
|
printk(KERN_WARNING "adfs: dir object %X has "
|
|
"malformed dir end\n", id);
|
|
goto out;
|
|
}
|
|
|
|
dir->parent_id = le32_to_cpu(h->bigdirparent);
|
|
dir->sb = sb;
|
|
return 0;
|
|
|
|
out:
|
|
if (dir->bh_fplus) {
|
|
for (i = 0; i < dir->nr_buffers; i++)
|
|
brelse(dir->bh_fplus[i]);
|
|
|
|
if (&dir->bh[0] != dir->bh_fplus)
|
|
kfree(dir->bh_fplus);
|
|
|
|
dir->bh_fplus = NULL;
|
|
}
|
|
|
|
dir->nr_buffers = 0;
|
|
dir->sb = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
|
|
{
|
|
struct adfs_bigdirheader *h =
|
|
(struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
|
|
int ret = -ENOENT;
|
|
|
|
if (fpos <= le32_to_cpu(h->bigdirentries)) {
|
|
dir->pos = fpos;
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
|
|
{
|
|
struct super_block *sb = dir->sb;
|
|
unsigned int buffer, partial, remainder;
|
|
|
|
buffer = offset >> sb->s_blocksize_bits;
|
|
offset &= sb->s_blocksize - 1;
|
|
|
|
partial = sb->s_blocksize - offset;
|
|
|
|
if (partial >= len)
|
|
memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len);
|
|
else {
|
|
char *c = (char *)to;
|
|
|
|
remainder = len - partial;
|
|
|
|
memcpy(c,
|
|
dir->bh_fplus[buffer]->b_data + offset,
|
|
partial);
|
|
|
|
memcpy(c + partial,
|
|
dir->bh_fplus[buffer + 1]->b_data,
|
|
remainder);
|
|
}
|
|
}
|
|
|
|
static int
|
|
adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
|
|
{
|
|
struct adfs_bigdirheader *h =
|
|
(struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
|
|
struct adfs_bigdirentry bde;
|
|
unsigned int offset;
|
|
int i, ret = -ENOENT;
|
|
|
|
if (dir->pos >= le32_to_cpu(h->bigdirentries))
|
|
goto out;
|
|
|
|
offset = offsetof(struct adfs_bigdirheader, bigdirname);
|
|
offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
|
|
offset += dir->pos * sizeof(struct adfs_bigdirentry);
|
|
|
|
dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
|
|
|
|
obj->loadaddr = le32_to_cpu(bde.bigdirload);
|
|
obj->execaddr = le32_to_cpu(bde.bigdirexec);
|
|
obj->size = le32_to_cpu(bde.bigdirlen);
|
|
obj->file_id = le32_to_cpu(bde.bigdirindaddr);
|
|
obj->attr = le32_to_cpu(bde.bigdirattr);
|
|
obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
|
|
|
|
offset = offsetof(struct adfs_bigdirheader, bigdirname);
|
|
offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
|
|
offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
|
|
offset += le32_to_cpu(bde.bigdirobnameptr);
|
|
|
|
dir_memcpy(dir, offset, obj->name, obj->name_len);
|
|
for (i = 0; i < obj->name_len; i++)
|
|
if (obj->name[i] == '/')
|
|
obj->name[i] = '.';
|
|
|
|
obj->filetype = -1;
|
|
|
|
/*
|
|
* object is a file and is filetyped and timestamped?
|
|
* RISC OS 12-bit filetype is stored in load_address[19:8]
|
|
*/
|
|
if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
|
|
(0xfff00000 == (0xfff00000 & obj->loadaddr))) {
|
|
obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
|
|
|
|
/* optionally append the ,xyz hex filetype suffix */
|
|
if (ADFS_SB(dir->sb)->s_ftsuffix)
|
|
obj->name_len +=
|
|
append_filetype_suffix(
|
|
&obj->name[obj->name_len],
|
|
obj->filetype);
|
|
}
|
|
|
|
dir->pos += 1;
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
adfs_fplus_sync(struct adfs_dir *dir)
|
|
{
|
|
int err = 0;
|
|
int i;
|
|
|
|
for (i = dir->nr_buffers - 1; i >= 0; i--) {
|
|
struct buffer_head *bh = dir->bh_fplus[i];
|
|
sync_dirty_buffer(bh);
|
|
if (buffer_req(bh) && !buffer_uptodate(bh))
|
|
err = -EIO;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
adfs_fplus_free(struct adfs_dir *dir)
|
|
{
|
|
int i;
|
|
|
|
if (dir->bh_fplus) {
|
|
for (i = 0; i < dir->nr_buffers; i++)
|
|
brelse(dir->bh_fplus[i]);
|
|
|
|
if (&dir->bh[0] != dir->bh_fplus)
|
|
kfree(dir->bh_fplus);
|
|
|
|
dir->bh_fplus = NULL;
|
|
}
|
|
|
|
dir->nr_buffers = 0;
|
|
dir->sb = NULL;
|
|
}
|
|
|
|
const struct adfs_dir_ops adfs_fplus_dir_ops = {
|
|
.read = adfs_fplus_read,
|
|
.setpos = adfs_fplus_setpos,
|
|
.getnext = adfs_fplus_getnext,
|
|
.sync = adfs_fplus_sync,
|
|
.free = adfs_fplus_free
|
|
};
|