mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-13 11:51:32 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
/*
|
|
* namei.c
|
|
*
|
|
* Copyright (c) 1999 Al Smith
|
|
*
|
|
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
|
|
*/
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/string.h>
|
|
#include <linux/efs_fs.h>
|
|
#include <linux/smp_lock.h>
|
|
|
|
static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len) {
|
|
struct buffer_head *bh;
|
|
|
|
int slot, namelen;
|
|
char *nameptr;
|
|
struct efs_dir *dirblock;
|
|
struct efs_dentry *dirslot;
|
|
efs_ino_t inodenum;
|
|
efs_block_t block;
|
|
|
|
if (inode->i_size & (EFS_DIRBSIZE-1))
|
|
printk(KERN_WARNING "EFS: WARNING: find_entry(): directory size not a multiple of EFS_DIRBSIZE\n");
|
|
|
|
for(block = 0; block < inode->i_blocks; block++) {
|
|
|
|
bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
|
|
if (!bh) {
|
|
printk(KERN_ERR "EFS: find_entry(): failed to read dir block %d\n", block);
|
|
return 0;
|
|
}
|
|
|
|
dirblock = (struct efs_dir *) bh->b_data;
|
|
|
|
if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
|
|
printk(KERN_ERR "EFS: find_entry(): invalid directory block\n");
|
|
brelse(bh);
|
|
return(0);
|
|
}
|
|
|
|
for(slot = 0; slot < dirblock->slots; slot++) {
|
|
dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
|
|
|
|
namelen = dirslot->namelen;
|
|
nameptr = dirslot->name;
|
|
|
|
if ((namelen == len) && (!memcmp(name, nameptr, len))) {
|
|
inodenum = be32_to_cpu(dirslot->inode);
|
|
brelse(bh);
|
|
return(inodenum);
|
|
}
|
|
}
|
|
brelse(bh);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) {
|
|
efs_ino_t inodenum;
|
|
struct inode * inode = NULL;
|
|
|
|
lock_kernel();
|
|
inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
|
|
if (inodenum) {
|
|
if (!(inode = iget(dir->i_sb, inodenum))) {
|
|
unlock_kernel();
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
}
|
|
unlock_kernel();
|
|
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
}
|
|
|
|
struct dentry *efs_get_parent(struct dentry *child)
|
|
{
|
|
struct dentry *parent;
|
|
struct inode *inode;
|
|
efs_ino_t ino;
|
|
int error;
|
|
|
|
lock_kernel();
|
|
|
|
error = -ENOENT;
|
|
ino = efs_find_entry(child->d_inode, "..", 2);
|
|
if (!ino)
|
|
goto fail;
|
|
|
|
error = -EACCES;
|
|
inode = iget(child->d_inode->i_sb, ino);
|
|
if (!inode)
|
|
goto fail;
|
|
|
|
error = -ENOMEM;
|
|
parent = d_alloc_anon(inode);
|
|
if (!parent)
|
|
goto fail_iput;
|
|
|
|
unlock_kernel();
|
|
return parent;
|
|
|
|
fail_iput:
|
|
iput(inode);
|
|
fail:
|
|
unlock_kernel();
|
|
return ERR_PTR(error);
|
|
}
|