Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-1.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *    Hypervisor filesystem for Linux on s390.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *    Copyright IBM Corp. 2006, 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define KMSG_COMPONENT "hypfs"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/fs_parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/kobject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/ebcdic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "hypfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define HYPFS_MAGIC 0x687970	/* ASCII 'hyp' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define TMP_SIZE 64		/* size of temporary buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static struct dentry *hypfs_create_update_file(struct dentry *dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) struct hypfs_sb_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	kuid_t uid;			/* uid used for files and dirs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	kgid_t gid;			/* gid used for files and dirs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct dentry *update_file;	/* file to trigger update */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	time64_t last_update;		/* last update, CLOCK_MONOTONIC time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct mutex lock;		/* lock to protect update process */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static const struct file_operations hypfs_file_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static struct file_system_type hypfs_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static const struct super_operations hypfs_s_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /* start of list of all dentries, which have to be deleted on update */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static struct dentry *hypfs_last_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static void hypfs_update_update(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct hypfs_sb_info *sb_info = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct inode *inode = d_inode(sb_info->update_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	sb_info->last_update = ktime_get_seconds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /* directory tree removal functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static void hypfs_add_dentry(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	dentry->d_fsdata = hypfs_last_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	hypfs_last_dentry = dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static void hypfs_remove(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct dentry *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	parent = dentry->d_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	inode_lock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (simple_positive(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		if (d_is_dir(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			simple_rmdir(d_inode(parent), dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			simple_unlink(d_inode(parent), dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	d_drop(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void hypfs_delete_tree(struct dentry *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	while (hypfs_last_dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		struct dentry *next_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		next_dentry = hypfs_last_dentry->d_fsdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		hypfs_remove(hypfs_last_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		hypfs_last_dentry = next_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	struct inode *ret = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		ret->i_ino = get_next_ino();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		ret->i_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		ret->i_uid = hypfs_info->uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		ret->i_gid = hypfs_info->gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		if (S_ISDIR(mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			set_nlink(ret, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void hypfs_evict_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	clear_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	kfree(inode->i_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int hypfs_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	char *data = file_inode(filp)->i_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	struct hypfs_sb_info *fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (filp->f_mode & FMODE_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		if (!(inode->i_mode & S_IWUGO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (filp->f_mode & FMODE_READ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		if (!(inode->i_mode & S_IRUGO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	fs_info = inode->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if(data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		mutex_lock(&fs_info->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		filp->private_data = kstrdup(data, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if (!filp->private_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			mutex_unlock(&fs_info->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		mutex_unlock(&fs_info->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	return nonseekable_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static ssize_t hypfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	struct file *file = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	char *data = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	size_t available = strlen(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	loff_t pos = iocb->ki_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	size_t count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (pos < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (pos >= available || !iov_iter_count(to))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	count = copy_to_iter(data + pos, available - pos, to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	iocb->ki_pos = pos + count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	file_accessed(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static ssize_t hypfs_write_iter(struct kiocb *iocb, struct iov_iter *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct super_block *sb = file_inode(iocb->ki_filp)->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	struct hypfs_sb_info *fs_info = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	size_t count = iov_iter_count(from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 * Currently we only allow one update per second for two reasons:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	 * 1. diag 204 is VERY expensive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	 * 2. If several processes do updates in parallel and then read the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	 *    hypfs data, the likelihood of collisions is reduced, if we restrict
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	 *    the minimum update interval. A collision occurs, if during the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	 *    data gathering of one process another process triggers an update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	 *    If the first process wants to ensure consistent data, it has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	 *    to restart data collection in this case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	mutex_lock(&fs_info->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (fs_info->last_update == ktime_get_seconds()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	hypfs_delete_tree(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (MACHINE_IS_VM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		rc = hypfs_vm_create_files(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		rc = hypfs_diag_create_files(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		pr_err("Updating the hypfs tree failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		hypfs_delete_tree(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	hypfs_update_update(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	rc = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	iov_iter_advance(from, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	mutex_unlock(&fs_info->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int hypfs_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	kfree(filp->private_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) enum { Opt_uid, Opt_gid, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static const struct fs_parameter_spec hypfs_fs_parameters[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	fsparam_u32("gid", Opt_gid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	fsparam_u32("uid", Opt_uid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static int hypfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct hypfs_sb_info *hypfs_info = fc->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	struct fs_parse_result result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	kuid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	kgid_t gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	int opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	opt = fs_parse(fc, hypfs_fs_parameters, param, &result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (opt < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	switch (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	case Opt_uid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		uid = make_kuid(current_user_ns(), result.uint_32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		if (!uid_valid(uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			return invalf(fc, "Unknown uid");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		hypfs_info->uid = uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	case Opt_gid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		gid = make_kgid(current_user_ns(), result.uint_32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (!gid_valid(gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			return invalf(fc, "Unknown gid");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		hypfs_info->gid = gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static int hypfs_show_options(struct seq_file *s, struct dentry *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	struct hypfs_sb_info *hypfs_info = root->d_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	seq_printf(s, ",uid=%u", from_kuid_munged(&init_user_ns, hypfs_info->uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	seq_printf(s, ",gid=%u", from_kgid_munged(&init_user_ns, hypfs_info->gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static int hypfs_fill_super(struct super_block *sb, struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct hypfs_sb_info *sbi = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	struct inode *root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	struct dentry *root_dentry, *update_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	sb->s_blocksize = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	sb->s_blocksize_bits = PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	sb->s_magic = HYPFS_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	sb->s_op = &hypfs_s_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (!root_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	root_inode->i_op = &simple_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	root_inode->i_fop = &simple_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	sb->s_root = root_dentry = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (!root_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	if (MACHINE_IS_VM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		rc = hypfs_vm_create_files(root_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		rc = hypfs_diag_create_files(root_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	update_file = hypfs_create_update_file(root_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (IS_ERR(update_file))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		return PTR_ERR(update_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	sbi->update_file = update_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	hypfs_update_update(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	pr_info("Hypervisor filesystem mounted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int hypfs_get_tree(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return get_tree_single(fc, hypfs_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) static void hypfs_free_fc(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	kfree(fc->s_fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static const struct fs_context_operations hypfs_context_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	.free		= hypfs_free_fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	.parse_param	= hypfs_parse_param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.get_tree	= hypfs_get_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static int hypfs_init_fs_context(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	struct hypfs_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	mutex_init(&sbi->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	sbi->uid = current_uid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	sbi->gid = current_gid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	fc->s_fs_info = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	fc->ops = &hypfs_context_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static void hypfs_kill_super(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct hypfs_sb_info *sb_info = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (sb->s_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		hypfs_delete_tree(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (sb_info && sb_info->update_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		hypfs_remove(sb_info->update_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	kfree(sb->s_fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	kill_litter_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static struct dentry *hypfs_create_file(struct dentry *parent, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 					char *data, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	inode_lock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	dentry = lookup_one_len(name, parent, strlen(name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		dentry = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	inode = hypfs_make_inode(parent->d_sb, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		dentry = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	if (S_ISREG(mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		inode->i_fop = &hypfs_file_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		if (data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 			inode->i_size = strlen(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	} else if (S_ISDIR(mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		inode->i_op = &simple_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		inode->i_fop = &simple_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		inc_nlink(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	inode->i_private = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	dget(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct dentry *hypfs_mkdir(struct dentry *parent, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	dentry = hypfs_create_file(parent, name, NULL, S_IFDIR | DIR_MODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	if (IS_ERR(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	hypfs_add_dentry(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static struct dentry *hypfs_create_update_file(struct dentry *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	dentry = hypfs_create_file(dir, "update", NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 				   S_IFREG | UPDATE_FILE_MODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	 * We do not put the update file on the 'delete' list with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	 * hypfs_add_dentry(), since it should not be removed when the tree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	 * is updated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct dentry *hypfs_create_u64(struct dentry *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 				const char *name, __u64 value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	char *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	char tmp[TMP_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	snprintf(tmp, TMP_SIZE, "%llu\n", (unsigned long long int)value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	buffer = kstrdup(tmp, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	dentry =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	    hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	hypfs_add_dentry(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct dentry *hypfs_create_str(struct dentry *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 				const char *name, char *string)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	char *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	sprintf(buffer, "%s\n", string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	dentry =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	    hypfs_create_file(dir, name, buffer, S_IFREG | REG_FILE_MODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	hypfs_add_dentry(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static const struct file_operations hypfs_file_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	.open		= hypfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	.release	= hypfs_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	.read_iter	= hypfs_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	.write_iter	= hypfs_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	.llseek		= no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) static struct file_system_type hypfs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	.name		= "s390_hypfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	.init_fs_context = hypfs_init_fs_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	.parameters	= hypfs_fs_parameters,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	.kill_sb	= hypfs_kill_super
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static const struct super_operations hypfs_s_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	.statfs		= simple_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	.evict_inode	= hypfs_evict_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 	.show_options	= hypfs_show_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int __init hypfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	hypfs_dbfs_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	if (hypfs_diag_init()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 		rc = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 		goto fail_dbfs_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	if (hypfs_vm_init()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 		rc = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 		goto fail_hypfs_diag_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	hypfs_sprp_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 	if (hypfs_diag0c_init()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 		rc = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 		goto fail_hypfs_sprp_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	rc = sysfs_create_mount_point(hypervisor_kobj, "s390");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 		goto fail_hypfs_diag0c_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	rc = register_filesystem(&hypfs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 		goto fail_filesystem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) fail_filesystem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 	sysfs_remove_mount_point(hypervisor_kobj, "s390");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) fail_hypfs_diag0c_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 	hypfs_diag0c_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) fail_hypfs_sprp_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 	hypfs_sprp_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 	hypfs_vm_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) fail_hypfs_diag_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	hypfs_diag_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) fail_dbfs_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 	hypfs_dbfs_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 	pr_err("Initialization of hypfs failed with rc=%i\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) device_initcall(hypfs_init)