mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
20c2df83d2
Slab destructors were no longer supported after Christoph's
c59def9f22 change. They've been
BUGs for both slab and slub, and slob never supported them
either.
This rips out support for the dtor pointer from kmem_cache_create()
completely and fixes up every single callsite in the kernel (there were
about 224, not including the slab allocator definitions themselves,
or the documentation references).
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
|
|
* mount.c - operations for initializing and mounting sysfs.
|
|
*/
|
|
|
|
#define DEBUG
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/init.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
#include "sysfs.h"
|
|
|
|
/* Random magic number */
|
|
#define SYSFS_MAGIC 0x62656572
|
|
|
|
struct vfsmount *sysfs_mount;
|
|
struct super_block * sysfs_sb = NULL;
|
|
struct kmem_cache *sysfs_dir_cachep;
|
|
|
|
static const struct super_operations sysfs_ops = {
|
|
.statfs = simple_statfs,
|
|
.drop_inode = sysfs_delete_inode,
|
|
};
|
|
|
|
struct sysfs_dirent sysfs_root = {
|
|
.s_count = ATOMIC_INIT(1),
|
|
.s_flags = SYSFS_ROOT,
|
|
.s_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
|
|
.s_ino = 1,
|
|
};
|
|
|
|
static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *inode;
|
|
struct dentry *root;
|
|
|
|
sb->s_blocksize = PAGE_CACHE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
|
sb->s_magic = SYSFS_MAGIC;
|
|
sb->s_op = &sysfs_ops;
|
|
sb->s_time_gran = 1;
|
|
sysfs_sb = sb;
|
|
|
|
/* get root inode, initialize and unlock it */
|
|
inode = sysfs_get_inode(&sysfs_root);
|
|
if (!inode) {
|
|
pr_debug("sysfs: could not get root inode\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
inode->i_op = &sysfs_dir_inode_operations;
|
|
inode->i_fop = &sysfs_dir_operations;
|
|
inc_nlink(inode); /* directory, account for "." */
|
|
unlock_new_inode(inode);
|
|
|
|
/* instantiate and link root dentry */
|
|
root = d_alloc_root(inode);
|
|
if (!root) {
|
|
pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
|
|
iput(inode);
|
|
return -ENOMEM;
|
|
}
|
|
sysfs_root.s_dentry = root;
|
|
root->d_fsdata = &sysfs_root;
|
|
sb->s_root = root;
|
|
return 0;
|
|
}
|
|
|
|
static int sysfs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, sysfs_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type sysfs_fs_type = {
|
|
.name = "sysfs",
|
|
.get_sb = sysfs_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
int __init sysfs_init(void)
|
|
{
|
|
int err = -ENOMEM;
|
|
|
|
sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",
|
|
sizeof(struct sysfs_dirent),
|
|
0, 0, NULL);
|
|
if (!sysfs_dir_cachep)
|
|
goto out;
|
|
|
|
err = register_filesystem(&sysfs_fs_type);
|
|
if (!err) {
|
|
sysfs_mount = kern_mount(&sysfs_fs_type);
|
|
if (IS_ERR(sysfs_mount)) {
|
|
printk(KERN_ERR "sysfs: could not mount!\n");
|
|
err = PTR_ERR(sysfs_mount);
|
|
sysfs_mount = NULL;
|
|
unregister_filesystem(&sysfs_fs_type);
|
|
goto out_err;
|
|
}
|
|
} else
|
|
goto out_err;
|
|
out:
|
|
return err;
|
|
out_err:
|
|
kmem_cache_destroy(sysfs_dir_cachep);
|
|
sysfs_dir_cachep = NULL;
|
|
goto out;
|
|
}
|