fs/adfs: dir: add generic directory reading
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>
diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
index 6a07c0d..ae11236 100644
--- a/fs/adfs/dir_fplus.c
+++ b/fs/adfs/dir_fplus.c
@@ -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;
}