kernel-ark/fs/hfs/dir.c
Arjan van de Ven 92e1d5be91 [PATCH] mark struct inode_operations const 2
Many struct inode_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

332 lines
8.0 KiB
C

/*
* linux/fs/hfs/dir.c
*
* Copyright (C) 1995-1997 Paul H. Hargrove
* (C) 2003 Ardis Technologies <roman@ardistech.com>
* This file may be distributed under the terms of the GNU General Public License.
*
* This file contains directory-related functions independent of which
* scheme is being used to represent forks.
*
* Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
*/
#include "hfs_fs.h"
#include "btree.h"
/*
* hfs_lookup()
*/
static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
hfs_cat_rec rec;
struct hfs_find_data fd;
struct inode *inode = NULL;
int res;
dentry->d_op = &hfs_dentry_operations;
hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
res = hfs_brec_read(&fd, &rec, sizeof(rec));
if (res) {
hfs_find_exit(&fd);
if (res == -ENOENT) {
/* No such entry */
inode = NULL;
goto done;
}
return ERR_PTR(res);
}
inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
hfs_find_exit(&fd);
if (!inode)
return ERR_PTR(-EACCES);
done:
d_add(dentry, inode);
return NULL;
}
/*
* hfs_readdir
*/
static int hfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
int len, err;
char strbuf[HFS_MAX_NAMELEN];
union hfs_cat_rec entry;
struct hfs_find_data fd;
struct hfs_readdir_data *rd;
u16 type;
if (filp->f_pos >= inode->i_size)
return 0;
hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
err = hfs_brec_find(&fd);
if (err)
goto out;
switch ((u32)filp->f_pos) {
case 0:
/* This is completely artificial... */
if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
goto out;
filp->f_pos++;
/* fall through */
case 1:
hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
if (entry.type != HFS_CDR_THD) {
printk(KERN_ERR "hfs: bad catalog folder thread\n");
err = -EIO;
goto out;
}
//if (fd.entrylength < HFS_MIN_THREAD_SZ) {
// printk(KERN_ERR "hfs: truncated catalog thread\n");
// err = -EIO;
// goto out;
//}
if (filldir(dirent, "..", 2, 1,
be32_to_cpu(entry.thread.ParID), DT_DIR))
goto out;
filp->f_pos++;
/* fall through */
default:
if (filp->f_pos >= inode->i_size)
goto out;
err = hfs_brec_goto(&fd, filp->f_pos - 1);
if (err)
goto out;
}
for (;;) {
if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
printk(KERN_ERR "hfs: walked past end of dir\n");
err = -EIO;
goto out;
}
hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
type = entry.type;
len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
if (type == HFS_CDR_DIR) {
if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
printk(KERN_ERR "hfs: small dir entry\n");
err = -EIO;
goto out;
}
if (filldir(dirent, strbuf, len, filp->f_pos,
be32_to_cpu(entry.dir.DirID), DT_DIR))
break;
} else if (type == HFS_CDR_FIL) {
if (fd.entrylength < sizeof(struct hfs_cat_file)) {
printk(KERN_ERR "hfs: small file entry\n");
err = -EIO;
goto out;
}
if (filldir(dirent, strbuf, len, filp->f_pos,
be32_to_cpu(entry.file.FlNum), DT_REG))
break;
} else {
printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
err = -EIO;
goto out;
}
filp->f_pos++;
if (filp->f_pos >= inode->i_size)
goto out;
err = hfs_brec_goto(&fd, 1);
if (err)
goto out;
}
rd = filp->private_data;
if (!rd) {
rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
if (!rd) {
err = -ENOMEM;
goto out;
}
filp->private_data = rd;
rd->file = filp;
list_add(&rd->list, &HFS_I(inode)->open_dir_list);
}
memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
out:
hfs_find_exit(&fd);
return err;
}
static int hfs_dir_release(struct inode *inode, struct file *file)
{
struct hfs_readdir_data *rd = file->private_data;
if (rd) {
list_del(&rd->list);
kfree(rd);
}
return 0;
}
/*
* hfs_create()
*
* This is the create() entry in the inode_operations structure for
* regular HFS directories. The purpose is to create a new file in
* a directory and return a corresponding inode, given the inode for
* the directory and the name (and its length) of the new file.
*/
static int hfs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
struct inode *inode;
int res;
inode = hfs_new_inode(dir, &dentry->d_name, mode);
if (!inode)
return -ENOSPC;
res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
if (res) {
inode->i_nlink = 0;
hfs_delete_inode(inode);
iput(inode);
return res;
}
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
return 0;
}
/*
* hfs_mkdir()
*
* This is the mkdir() entry in the inode_operations structure for
* regular HFS directories. The purpose is to create a new directory
* in a directory, given the inode for the parent directory and the
* name (and its length) of the new directory.
*/
static int hfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct inode *inode;
int res;
inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
if (!inode)
return -ENOSPC;
res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
if (res) {
inode->i_nlink = 0;
hfs_delete_inode(inode);
iput(inode);
return res;
}
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
return 0;
}
/*
* hfs_unlink()
*
* This is the unlink() entry in the inode_operations structure for
* regular HFS directories. The purpose is to delete an existing
* file, given the inode for the parent directory and the name
* (and its length) of the existing file.
*/
static int hfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode;
int res;
inode = dentry->d_inode;
res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
if (res)
return res;
drop_nlink(inode);
hfs_delete_inode(inode);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
return res;
}
/*
* hfs_rmdir()
*
* This is the rmdir() entry in the inode_operations structure for
* regular HFS directories. The purpose is to delete an existing
* directory, given the inode for the parent directory and the name
* (and its length) of the existing directory.
*/
static int hfs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct inode *inode;
int res;
inode = dentry->d_inode;
if (inode->i_size != 2)
return -ENOTEMPTY;
res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
if (res)
return res;
clear_nlink(inode);
inode->i_ctime = CURRENT_TIME_SEC;
hfs_delete_inode(inode);
mark_inode_dirty(inode);
return 0;
}
/*
* hfs_rename()
*
* This is the rename() entry in the inode_operations structure for
* regular HFS directories. The purpose is to rename an existing
* file or directory, given the inode for the current directory and
* the name (and its length) of the existing file/directory and the
* inode for the new directory and the name (and its length) of the
* new file/directory.
* XXX: how do you handle must_be dir?
*/
static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
int res;
/* Unlink destination if it already exists */
if (new_dentry->d_inode) {
res = hfs_unlink(new_dir, new_dentry);
if (res)
return res;
}
res = hfs_cat_move(old_dentry->d_inode->i_ino,
old_dir, &old_dentry->d_name,
new_dir, &new_dentry->d_name);
if (!res)
hfs_cat_build_key(old_dir->i_sb,
(btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
new_dir->i_ino, &new_dentry->d_name);
return res;
}
const struct file_operations hfs_dir_operations = {
.read = generic_read_dir,
.readdir = hfs_readdir,
.llseek = generic_file_llseek,
.release = hfs_dir_release,
};
const struct inode_operations hfs_dir_inode_operations = {
.create = hfs_create,
.lookup = hfs_lookup,
.unlink = hfs_unlink,
.mkdir = hfs_mkdir,
.rmdir = hfs_rmdir,
.rename = hfs_rename,
.setattr = hfs_inode_setattr,
};