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fs/adfs: dir: add generic directory reading

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Both directory formats code the mechanics of fetching the directory
buffers using their own implementations.  Consolidate these into one
implementation.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Russell King
2019-12-09 11:09:35 +00:00
committed by Al Viro
parent a317120bf7
commit 419a6e5e82
4 changed files with 74 additions and 77 deletions
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76
fs/adfs/dir_fplus.c
View File

@@ -4,87 +4,49 @@
*
* Copyright (C) 1997-1999 Russell King
*/
#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)
static int adfs_fplus_read(struct super_block *sb, u32 indaddr,
unsigned int size, struct adfs_dir *dir)
{
struct adfs_bigdirheader *h;
struct adfs_bigdirtail *t;
unsigned long block;
unsigned int blk, size;
int ret = -EIO;
unsigned int dirsize;
int ret;
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->bhs[0] = sb_bread(sb, block);
if (!dir->bhs[0])
goto out;
dir->nr_buffers += 1;
/* Read first buffer */
ret = adfs_dir_read_buffers(sb, indaddr, sb->s_blocksize, dir);
if (ret)
return ret;
h = (struct adfs_bigdirheader *)dir->bhs[0]->b_data;
size = le32_to_cpu(h->bigdirsize);
if (size != sz) {
dirsize = le32_to_cpu(h->bigdirsize);
if (dirsize != size) {
adfs_msg(sb, KERN_WARNING,
"directory header size %X does not match directory size %X",
size, sz);
"dir %06x header size %X does not match directory size %X",
indaddr, dirsize, size);
}
if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
h->bigdirversion[2] != 0 || size & 2047 ||
h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
adfs_error(sb, "dir %06x has malformed header", id);
adfs_error(sb, "dir %06x has malformed header", indaddr);
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 **bhs =
kcalloc(size, sizeof(struct buffer_head *),
GFP_KERNEL);
if (!bhs) {
adfs_msg(sb, KERN_ERR,
"not enough memory for dir object %X (%d blocks)",
id, size);
ret = -ENOMEM;
goto out;
}
dir->bhs = bhs;
/* copy over the pointer to the block that we've already read */
dir->bhs[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->bhs[blk] = sb_bread(sb, block);
if (!dir->bhs[blk]) {
adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX",
id, blk, block);
goto out;
}
dir->nr_buffers += 1;
}
/* Read remaining buffers */
ret = adfs_dir_read_buffers(sb, indaddr, dirsize, dir);
if (ret)
return ret;
t = (struct adfs_bigdirtail *)
(dir->bhs[size - 1]->b_data + (sb->s_blocksize - 8));
(dir->bhs[dir->nr_buffers - 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) {
adfs_error(sb, "dir %06x has malformed tail", id);
adfs_error(sb, "dir %06x has malformed tail", indaddr);
goto out;
}