Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright 2005-2006 Ian Kent <raven@themaw.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "autofs_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	ino = kzalloc(sizeof(*ino), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	if (ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 		INIT_LIST_HEAD(&ino->active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 		INIT_LIST_HEAD(&ino->expiring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		ino->last_used = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		ino->sbi = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	return ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) void autofs_clean_ino(struct autofs_info *ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	ino->uid = GLOBAL_ROOT_UID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	ino->gid = GLOBAL_ROOT_GID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	ino->last_used = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) void autofs_free_ino(struct autofs_info *ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	kfree_rcu(ino, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) void autofs_kill_sb(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct autofs_sb_info *sbi = autofs_sbi(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	 * In the event of a failure in get_sb_nodev the superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	 * info is not present so nothing else has been setup, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	 * just call kill_anon_super when we are called from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	 * deactivate_super.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (sbi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		/* Free wait queues, close pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		autofs_catatonic_mode(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		put_pid(sbi->oz_pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	pr_debug("shutting down\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	kill_litter_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if (sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		kfree_rcu(sbi, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int autofs_show_options(struct seq_file *m, struct dentry *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct inode *root_inode = d_inode(root->d_sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	seq_printf(m, ",fd=%d", sbi->pipefd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		seq_printf(m, ",uid=%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			from_kuid_munged(&init_user_ns, root_inode->i_uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		seq_printf(m, ",gid=%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			from_kgid_munged(&init_user_ns, root_inode->i_gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	seq_printf(m, ",minproto=%d", sbi->min_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	seq_printf(m, ",maxproto=%d", sbi->max_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (autofs_type_offset(sbi->type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		seq_puts(m, ",offset");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	else if (autofs_type_direct(sbi->type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		seq_puts(m, ",direct");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		seq_puts(m, ",indirect");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		seq_puts(m, ",strictexpire");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (sbi->flags & AUTOFS_SBI_IGNORE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		seq_puts(m, ",ignore");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #ifdef CONFIG_CHECKPOINT_RESTORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (sbi->pipe)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		seq_puts(m, ",pipe_ino=-1");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void autofs_evict_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	clear_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	kfree(inode->i_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static const struct super_operations autofs_sops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	.statfs		= simple_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	.show_options	= autofs_show_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	.evict_inode	= autofs_evict_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	Opt_ignore};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static const match_table_t tokens = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	{Opt_fd, "fd=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	{Opt_uid, "uid=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	{Opt_gid, "gid=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	{Opt_pgrp, "pgrp=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	{Opt_minproto, "minproto=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	{Opt_maxproto, "maxproto=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	{Opt_indirect, "indirect"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	{Opt_direct, "direct"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	{Opt_offset, "offset"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	{Opt_strictexpire, "strictexpire"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	{Opt_ignore, "ignore"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	{Opt_err, NULL}
^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 parse_options(char *options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			 struct inode *root, int *pgrp, bool *pgrp_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			 struct autofs_sb_info *sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	substring_t args[MAX_OPT_ARGS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	int option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	int pipefd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	kuid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	kgid_t gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	root->i_uid = current_uid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	root->i_gid = current_gid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	sbi->pipefd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (!options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	while ((p = strsep(&options, ",")) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		int token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if (!*p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		token = match_token(p, tokens, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		switch (token) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		case Opt_fd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			if (match_int(args, &pipefd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			sbi->pipefd = pipefd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		case Opt_uid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			if (match_int(args, &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			uid = make_kuid(current_user_ns(), option);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			if (!uid_valid(uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			root->i_uid = uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		case Opt_gid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			if (match_int(args, &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			gid = make_kgid(current_user_ns(), option);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			if (!gid_valid(gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			root->i_gid = gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		case Opt_pgrp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			if (match_int(args, &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			*pgrp = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			*pgrp_set = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		case Opt_minproto:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			if (match_int(args, &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			sbi->min_proto = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		case Opt_maxproto:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			if (match_int(args, &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			sbi->max_proto = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		case Opt_indirect:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			set_autofs_type_indirect(&sbi->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		case Opt_direct:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			set_autofs_type_direct(&sbi->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		case Opt_offset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			set_autofs_type_offset(&sbi->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		case Opt_strictexpire:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			sbi->flags |= AUTOFS_SBI_STRICTEXPIRE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		case Opt_ignore:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			sbi->flags |= AUTOFS_SBI_IGNORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			return 1;
^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) 	return (sbi->pipefd < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int autofs_fill_super(struct super_block *s, void *data, int silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	struct inode *root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct dentry *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct file *pipe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	struct autofs_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	int pgrp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	bool pgrp_set = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	pr_debug("starting up, sbi = %p\n", sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	s->s_fs_info = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	sbi->magic = AUTOFS_SBI_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	sbi->pipefd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	sbi->pipe = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	sbi->exp_timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	sbi->oz_pgrp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	sbi->sb = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	sbi->version = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	sbi->sub_version = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	sbi->flags = AUTOFS_SBI_CATATONIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	set_autofs_type_indirect(&sbi->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	sbi->min_proto = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	sbi->max_proto = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	mutex_init(&sbi->wq_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	mutex_init(&sbi->pipe_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	spin_lock_init(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	sbi->queues = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	spin_lock_init(&sbi->lookup_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	INIT_LIST_HEAD(&sbi->active_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	INIT_LIST_HEAD(&sbi->expiring_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	s->s_blocksize = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	s->s_blocksize_bits = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	s->s_magic = AUTOFS_SUPER_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	s->s_op = &autofs_sops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	s->s_d_op = &autofs_dentry_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	s->s_time_gran = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	 * Get the root inode and dentry, but defer checking for errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	ino = autofs_new_ino(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (!ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	root_inode = autofs_get_inode(s, S_IFDIR | 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	root = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (!root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		goto fail_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	pipe = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	root->d_fsdata = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	/* Can this call block? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		pr_err("called with bogus options\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		goto fail_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	/* Test versions first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		pr_err("kernel does not match daemon version "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		       "daemon (%d, %d) kernel (%d, %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		       sbi->min_proto, sbi->max_proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		       AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		goto fail_dput;
^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) 	/* Establish highest kernel protocol version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		sbi->version = AUTOFS_MAX_PROTO_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		sbi->version = sbi->max_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (pgrp_set) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		sbi->oz_pgrp = find_get_pid(pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (!sbi->oz_pgrp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			pr_err("could not find process group %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 				pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			goto fail_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (autofs_type_trigger(sbi->type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		__managed_dentry_set_managed(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	root_inode->i_fop = &autofs_root_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	root_inode->i_op = &autofs_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	pr_debug("pipe fd = %d, pgrp = %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		 sbi->pipefd, pid_nr(sbi->oz_pgrp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	pipe = fget(sbi->pipefd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (!pipe) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		pr_err("could not open pipe file descriptor\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		goto fail_put_pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	ret = autofs_prepare_pipe(pipe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		goto fail_fput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	sbi->pipe = pipe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	sbi->flags &= ~AUTOFS_SBI_CATATONIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	 * Success! Install the root dentry now to indicate completion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	s->s_root = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	 * Failure ... clean up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) fail_fput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	pr_err("pipe file descriptor does not contain proper ops\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	fput(pipe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) fail_put_pid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	put_pid(sbi->oz_pgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) fail_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	dput(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) fail_ino:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	autofs_free_ino(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) fail_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	s->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	struct inode *inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	if (inode == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	inode->i_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (sb->s_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		inode->i_uid = d_inode(sb->s_root)->i_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		inode->i_gid = d_inode(sb->s_root)->i_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	inode->i_ino = get_next_ino();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	if (S_ISDIR(mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		inode->i_op = &autofs_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		inode->i_fop = &autofs_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	} else if (S_ISLNK(mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		inode->i_op = &autofs_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }