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!
318 lines
6.2 KiB
C
318 lines
6.2 KiB
C
/*
|
|
* linux/fs/minix/namei.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include "minix.h"
|
|
|
|
static inline void inc_count(struct inode *inode)
|
|
{
|
|
inode->i_nlink++;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
static inline void dec_count(struct inode *inode)
|
|
{
|
|
inode->i_nlink--;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
static int add_nondir(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = minix_add_link(dentry, inode);
|
|
if (!err) {
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
dec_count(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
static int minix_hash(struct dentry *dentry, struct qstr *qstr)
|
|
{
|
|
unsigned long hash;
|
|
int i;
|
|
const unsigned char *name;
|
|
|
|
i = minix_sb(dentry->d_inode->i_sb)->s_namelen;
|
|
if (i >= qstr->len)
|
|
return 0;
|
|
/* Truncate the name in place, avoids having to define a compare
|
|
function. */
|
|
qstr->len = i;
|
|
name = qstr->name;
|
|
hash = init_name_hash();
|
|
while (i--)
|
|
hash = partial_name_hash(*name++, hash);
|
|
qstr->hash = end_name_hash(hash);
|
|
return 0;
|
|
}
|
|
|
|
struct dentry_operations minix_dentry_operations = {
|
|
.d_hash = minix_hash,
|
|
};
|
|
|
|
static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct inode * inode = NULL;
|
|
ino_t ino;
|
|
|
|
dentry->d_op = dir->i_sb->s_root->d_op;
|
|
|
|
if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
ino = minix_inode_by_name(dentry);
|
|
if (ino) {
|
|
inode = iget(dir->i_sb, ino);
|
|
|
|
if (!inode)
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
}
|
|
|
|
static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
|
|
{
|
|
int error;
|
|
struct inode *inode;
|
|
|
|
if (!old_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
inode = minix_new_inode(dir, &error);
|
|
|
|
if (inode) {
|
|
inode->i_mode = mode;
|
|
minix_set_inode(inode, rdev);
|
|
mark_inode_dirty(inode);
|
|
error = add_nondir(dentry, inode);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int minix_create(struct inode * dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
return minix_mknod(dir, dentry, mode, 0);
|
|
}
|
|
|
|
static int minix_symlink(struct inode * dir, struct dentry *dentry,
|
|
const char * symname)
|
|
{
|
|
int err = -ENAMETOOLONG;
|
|
int i = strlen(symname)+1;
|
|
struct inode * inode;
|
|
|
|
if (i > dir->i_sb->s_blocksize)
|
|
goto out;
|
|
|
|
inode = minix_new_inode(dir, &err);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
inode->i_mode = S_IFLNK | 0777;
|
|
minix_set_inode(inode, 0);
|
|
err = page_symlink(inode, symname, i);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = add_nondir(dentry, inode);
|
|
out:
|
|
return err;
|
|
|
|
out_fail:
|
|
dec_count(inode);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
static int minix_link(struct dentry * old_dentry, struct inode * dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = old_dentry->d_inode;
|
|
|
|
if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max)
|
|
return -EMLINK;
|
|
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
inc_count(inode);
|
|
atomic_inc(&inode->i_count);
|
|
return add_nondir(dentry, inode);
|
|
}
|
|
|
|
static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct inode * inode;
|
|
int err = -EMLINK;
|
|
|
|
if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
|
|
goto out;
|
|
|
|
inc_count(dir);
|
|
|
|
inode = minix_new_inode(dir, &err);
|
|
if (!inode)
|
|
goto out_dir;
|
|
|
|
inode->i_mode = S_IFDIR | mode;
|
|
if (dir->i_mode & S_ISGID)
|
|
inode->i_mode |= S_ISGID;
|
|
minix_set_inode(inode, 0);
|
|
|
|
inc_count(inode);
|
|
|
|
err = minix_make_empty(inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = minix_add_link(dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
d_instantiate(dentry, inode);
|
|
out:
|
|
return err;
|
|
|
|
out_fail:
|
|
dec_count(inode);
|
|
dec_count(inode);
|
|
iput(inode);
|
|
out_dir:
|
|
dec_count(dir);
|
|
goto out;
|
|
}
|
|
|
|
static int minix_unlink(struct inode * dir, struct dentry *dentry)
|
|
{
|
|
int err = -ENOENT;
|
|
struct inode * inode = dentry->d_inode;
|
|
struct page * page;
|
|
struct minix_dir_entry * de;
|
|
|
|
de = minix_find_entry(dentry, &page);
|
|
if (!de)
|
|
goto end_unlink;
|
|
|
|
err = minix_delete_entry(de, page);
|
|
if (err)
|
|
goto end_unlink;
|
|
|
|
inode->i_ctime = dir->i_ctime;
|
|
dec_count(inode);
|
|
end_unlink:
|
|
return err;
|
|
}
|
|
|
|
static int minix_rmdir(struct inode * dir, struct dentry *dentry)
|
|
{
|
|
struct inode * inode = dentry->d_inode;
|
|
int err = -ENOTEMPTY;
|
|
|
|
if (minix_empty_dir(inode)) {
|
|
err = minix_unlink(dir, dentry);
|
|
if (!err) {
|
|
dec_count(dir);
|
|
dec_count(inode);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
|
|
struct inode * new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct minix_sb_info * info = minix_sb(old_dir->i_sb);
|
|
struct inode * old_inode = old_dentry->d_inode;
|
|
struct inode * new_inode = new_dentry->d_inode;
|
|
struct page * dir_page = NULL;
|
|
struct minix_dir_entry * dir_de = NULL;
|
|
struct page * old_page;
|
|
struct minix_dir_entry * old_de;
|
|
int err = -ENOENT;
|
|
|
|
old_de = minix_find_entry(old_dentry, &old_page);
|
|
if (!old_de)
|
|
goto out;
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
dir_de = minix_dotdot(old_inode, &dir_page);
|
|
if (!dir_de)
|
|
goto out_old;
|
|
}
|
|
|
|
if (new_inode) {
|
|
struct page * new_page;
|
|
struct minix_dir_entry * new_de;
|
|
|
|
err = -ENOTEMPTY;
|
|
if (dir_de && !minix_empty_dir(new_inode))
|
|
goto out_dir;
|
|
|
|
err = -ENOENT;
|
|
new_de = minix_find_entry(new_dentry, &new_page);
|
|
if (!new_de)
|
|
goto out_dir;
|
|
inc_count(old_inode);
|
|
minix_set_link(new_de, new_page, old_inode);
|
|
new_inode->i_ctime = CURRENT_TIME_SEC;
|
|
if (dir_de)
|
|
new_inode->i_nlink--;
|
|
dec_count(new_inode);
|
|
} else {
|
|
if (dir_de) {
|
|
err = -EMLINK;
|
|
if (new_dir->i_nlink >= info->s_link_max)
|
|
goto out_dir;
|
|
}
|
|
inc_count(old_inode);
|
|
err = minix_add_link(new_dentry, old_inode);
|
|
if (err) {
|
|
dec_count(old_inode);
|
|
goto out_dir;
|
|
}
|
|
if (dir_de)
|
|
inc_count(new_dir);
|
|
}
|
|
|
|
minix_delete_entry(old_de, old_page);
|
|
dec_count(old_inode);
|
|
|
|
if (dir_de) {
|
|
minix_set_link(dir_de, dir_page, new_dir);
|
|
dec_count(old_dir);
|
|
}
|
|
return 0;
|
|
|
|
out_dir:
|
|
if (dir_de) {
|
|
kunmap(dir_page);
|
|
page_cache_release(dir_page);
|
|
}
|
|
out_old:
|
|
kunmap(old_page);
|
|
page_cache_release(old_page);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* directories can handle most operations...
|
|
*/
|
|
struct inode_operations minix_dir_inode_operations = {
|
|
.create = minix_create,
|
|
.lookup = minix_lookup,
|
|
.link = minix_link,
|
|
.unlink = minix_unlink,
|
|
.symlink = minix_symlink,
|
|
.mkdir = minix_mkdir,
|
|
.rmdir = minix_rmdir,
|
|
.mknod = minix_mknod,
|
|
.rename = minix_rename,
|
|
.getattr = minix_getattr,
|
|
};
|