Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * super.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 1999 Al Smith
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "efs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/efs_vh.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/efs_fs_sb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static int efs_fill_super(struct super_block *s, void *d, int silent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static struct dentry *efs_mount(struct file_system_type *fs_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	int flags, const char *dev_name, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static void efs_kill_sb(struct super_block *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct efs_sb_info *sbi = SUPER_INFO(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	kill_block_super(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static struct file_system_type efs_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.name		= "efs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	.mount		= efs_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	.kill_sb	= efs_kill_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	.fs_flags	= FS_REQUIRES_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) MODULE_ALIAS_FS("efs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static struct pt_types sgi_pt_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	{0x00,		"SGI vh"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	{0x01,		"SGI trkrepl"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	{0x02,		"SGI secrepl"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	{0x03,		"SGI raw"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	{0x04,		"SGI bsd"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	{SGI_SYSV,	"SGI sysv"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	{0x06,		"SGI vol"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	{SGI_EFS,	"SGI efs"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	{0x08,		"SGI lv"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	{0x09,		"SGI rlv"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	{0x0A,		"SGI xfs"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	{0x0B,		"SGI xfslog"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	{0x0C,		"SGI xlv"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	{0x82,		"Linux swap"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	{0x83,		"Linux native"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	{0,		NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) };
^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 struct kmem_cache * efs_inode_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static struct inode *efs_alloc_inode(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct efs_inode_info *ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	ei = kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (!ei)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	return &ei->vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static void efs_free_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static void init_once(void *foo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	struct efs_inode_info *ei = (struct efs_inode_info *) foo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	inode_init_once(&ei->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static int __init init_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	efs_inode_cachep = kmem_cache_create("efs_inode_cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 				sizeof(struct efs_inode_info), 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 				SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 				SLAB_ACCOUNT, init_once);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (efs_inode_cachep == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static void destroy_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 * Make sure all delayed rcu free inodes are flushed before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * destroy cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	kmem_cache_destroy(efs_inode_cachep);
^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 int efs_remount(struct super_block *sb, int *flags, char *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	sync_filesystem(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	*flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static const struct super_operations efs_superblock_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	.alloc_inode	= efs_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	.free_inode	= efs_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	.statfs		= efs_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	.remount_fs	= efs_remount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static const struct export_operations efs_export_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	.fh_to_dentry	= efs_fh_to_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	.fh_to_parent	= efs_fh_to_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	.get_parent	= efs_get_parent,
^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) static int __init init_efs_fs(void) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	err = init_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	err = register_filesystem(&efs_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	destroy_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static void __exit exit_efs_fs(void) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	unregister_filesystem(&efs_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	destroy_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) module_init(init_efs_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) module_exit(exit_efs_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static efs_block_t efs_validate_vh(struct volume_header *vh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	int		i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	__be32		cs, *ui;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	int		csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	efs_block_t	sblock = 0; /* shuts up gcc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct pt_types	*pt_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	int		pt_type, slice = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		 * assume that we're dealing with a partition and allow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		 * read_super() to try and detect a valid superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		 * on the next block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return 0;
^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) 	ui = ((__be32 *) (vh + 1)) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	for(csum = 0; ui >= ((__be32 *) vh);) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		cs = *ui--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		csum += be32_to_cpu(cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (csum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		pr_warn("SGI disklabel: checksum bad, label corrupted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	for(i = 0; i < NVDIR; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		int	j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		char	name[VDNAMESIZE+1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		for(j = 0; j < VDNAMESIZE; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			name[j] = vh->vh_vd[i].vd_name[j];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		name[j] = (char) 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		if (name[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 				name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 				(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	for(i = 0; i < NPARTAB; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			if (pt_type == pt_entry->pt_type) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 				 i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 				 (int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 				 pt_type, (pt_entry->pt_name) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 				 pt_entry->pt_name : "unknown");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		if (IS_EFS(pt_type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			slice = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (slice == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		pr_notice("partition table contained no EFS partitions\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			sblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	return sblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	sb->fs_magic     = be32_to_cpu(super->fs_magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	sb->total_blocks = be32_to_cpu(super->fs_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	sb->first_block  = be32_to_cpu(super->fs_firstcg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	sb->group_size   = be32_to_cpu(super->fs_cgfsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	sb->data_free    = be32_to_cpu(super->fs_tfree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	sb->inode_free   = be32_to_cpu(super->fs_tinode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	sb->total_groups = be16_to_cpu(super->fs_ncg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)     
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	return 0;    
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static int efs_fill_super(struct super_block *s, void *d, int silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct efs_sb_info *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct inode *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)  	sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (!sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	s->s_fs_info = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	s->s_time_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	s->s_time_max = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)  
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	s->s_magic		= EFS_SUPER_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		pr_err("device does not support %d byte blocks\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			EFS_BLOCKSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)   
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	/* read the vh (volume header) block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	bh = sb_bread(s, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		pr_err("cannot read volume header\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	 * if this returns zero then we didn't find any partition table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	 * this isn't (yet) an error - just assume for the moment that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	 * the device is valid and go on to search for a superblock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (sb->fs_start == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return -EINVAL;
^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) 	bh = sb_bread(s, sb->fs_start + EFS_SUPER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		pr_err("cannot read superblock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		pr_warn("invalid superblock at block %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			sb->fs_start + EFS_SUPER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (!sb_rdonly(s)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		pr_info("forcing read-only mode\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		s->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	s->s_op   = &efs_superblock_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	s->s_export_op = &efs_export_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	root = efs_iget(s, EFS_ROOTINODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (IS_ERR(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		pr_err("get root inode failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		return PTR_ERR(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	s->s_root = d_make_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!(s->s_root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		pr_err("get root dentry failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	struct super_block *sb = dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	struct efs_sb_info *sbi = SUPER_INFO(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	buf->f_type    = EFS_SUPER_MAGIC;	/* efs magic number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	buf->f_bsize   = EFS_BLOCKSIZE;		/* blocksize */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	buf->f_blocks  = sbi->total_groups *	/* total data blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			(sbi->group_size - sbi->inode_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	buf->f_bfree   = sbi->data_free;	/* free data blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	buf->f_bavail  = sbi->data_free;	/* free blocks for non-root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	buf->f_files   = sbi->total_groups *	/* total inodes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			sbi->inode_blocks *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	buf->f_ffree   = sbi->inode_free;	/* free inodes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	buf->f_fsid    = u64_to_fsid(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	buf->f_namelen = EFS_MAXNAMELEN;	/* max filename length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)