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386 lines
8.7 KiB
386 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved |
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* Copyright 2005-2006 Ian Kent <[email protected]> |
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*/ |
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#include <linux/seq_file.h> |
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#include <linux/pagemap.h> |
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#include <linux/parser.h> |
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#include "autofs_i.h" |
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struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi) |
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{ |
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struct autofs_info *ino; |
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ino = kzalloc(sizeof(*ino), GFP_KERNEL); |
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if (ino) { |
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INIT_LIST_HEAD(&ino->active); |
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INIT_LIST_HEAD(&ino->expiring); |
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ino->last_used = jiffies; |
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ino->sbi = sbi; |
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ino->count = 1; |
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} |
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return ino; |
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} |
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void autofs_clean_ino(struct autofs_info *ino) |
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{ |
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ino->uid = GLOBAL_ROOT_UID; |
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ino->gid = GLOBAL_ROOT_GID; |
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ino->last_used = jiffies; |
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} |
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void autofs_free_ino(struct autofs_info *ino) |
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{ |
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kfree_rcu(ino, rcu); |
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} |
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void autofs_kill_sb(struct super_block *sb) |
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{ |
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struct autofs_sb_info *sbi = autofs_sbi(sb); |
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/* |
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* In the event of a failure in get_sb_nodev the superblock |
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* info is not present so nothing else has been setup, so |
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* just call kill_anon_super when we are called from |
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* deactivate_super. |
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*/ |
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if (sbi) { |
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/* Free wait queues, close pipe */ |
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autofs_catatonic_mode(sbi); |
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put_pid(sbi->oz_pgrp); |
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} |
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pr_debug("shutting down\n"); |
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kill_litter_super(sb); |
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if (sbi) |
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kfree_rcu(sbi, rcu); |
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} |
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static int autofs_show_options(struct seq_file *m, struct dentry *root) |
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{ |
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struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); |
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struct inode *root_inode = d_inode(root->d_sb->s_root); |
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if (!sbi) |
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return 0; |
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seq_printf(m, ",fd=%d", sbi->pipefd); |
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if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID)) |
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seq_printf(m, ",uid=%u", |
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from_kuid_munged(&init_user_ns, root_inode->i_uid)); |
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if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID)) |
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seq_printf(m, ",gid=%u", |
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from_kgid_munged(&init_user_ns, root_inode->i_gid)); |
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seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp)); |
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seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ); |
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seq_printf(m, ",minproto=%d", sbi->min_proto); |
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seq_printf(m, ",maxproto=%d", sbi->max_proto); |
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if (autofs_type_offset(sbi->type)) |
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seq_puts(m, ",offset"); |
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else if (autofs_type_direct(sbi->type)) |
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seq_puts(m, ",direct"); |
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else |
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seq_puts(m, ",indirect"); |
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if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE) |
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seq_puts(m, ",strictexpire"); |
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if (sbi->flags & AUTOFS_SBI_IGNORE) |
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seq_puts(m, ",ignore"); |
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#ifdef CONFIG_CHECKPOINT_RESTORE |
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if (sbi->pipe) |
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seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino); |
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else |
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seq_puts(m, ",pipe_ino=-1"); |
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#endif |
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return 0; |
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} |
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static void autofs_evict_inode(struct inode *inode) |
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{ |
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clear_inode(inode); |
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kfree(inode->i_private); |
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} |
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static const struct super_operations autofs_sops = { |
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.statfs = simple_statfs, |
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.show_options = autofs_show_options, |
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.evict_inode = autofs_evict_inode, |
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}; |
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enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto, |
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Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire, |
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Opt_ignore}; |
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static const match_table_t tokens = { |
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{Opt_fd, "fd=%u"}, |
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{Opt_uid, "uid=%u"}, |
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{Opt_gid, "gid=%u"}, |
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{Opt_pgrp, "pgrp=%u"}, |
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{Opt_minproto, "minproto=%u"}, |
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{Opt_maxproto, "maxproto=%u"}, |
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{Opt_indirect, "indirect"}, |
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{Opt_direct, "direct"}, |
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{Opt_offset, "offset"}, |
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{Opt_strictexpire, "strictexpire"}, |
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{Opt_ignore, "ignore"}, |
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{Opt_err, NULL} |
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}; |
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static int parse_options(char *options, |
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struct inode *root, int *pgrp, bool *pgrp_set, |
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struct autofs_sb_info *sbi) |
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{ |
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char *p; |
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substring_t args[MAX_OPT_ARGS]; |
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int option; |
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int pipefd = -1; |
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kuid_t uid; |
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kgid_t gid; |
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root->i_uid = current_uid(); |
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root->i_gid = current_gid(); |
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sbi->min_proto = AUTOFS_MIN_PROTO_VERSION; |
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sbi->max_proto = AUTOFS_MAX_PROTO_VERSION; |
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sbi->pipefd = -1; |
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if (!options) |
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return 1; |
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while ((p = strsep(&options, ",")) != NULL) { |
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int token; |
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if (!*p) |
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continue; |
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token = match_token(p, tokens, args); |
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switch (token) { |
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case Opt_fd: |
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if (match_int(args, &pipefd)) |
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return 1; |
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sbi->pipefd = pipefd; |
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break; |
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case Opt_uid: |
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if (match_int(args, &option)) |
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return 1; |
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uid = make_kuid(current_user_ns(), option); |
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if (!uid_valid(uid)) |
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return 1; |
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root->i_uid = uid; |
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break; |
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case Opt_gid: |
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if (match_int(args, &option)) |
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return 1; |
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gid = make_kgid(current_user_ns(), option); |
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if (!gid_valid(gid)) |
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return 1; |
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root->i_gid = gid; |
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break; |
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case Opt_pgrp: |
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if (match_int(args, &option)) |
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return 1; |
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*pgrp = option; |
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*pgrp_set = true; |
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break; |
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case Opt_minproto: |
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if (match_int(args, &option)) |
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return 1; |
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sbi->min_proto = option; |
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break; |
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case Opt_maxproto: |
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if (match_int(args, &option)) |
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return 1; |
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sbi->max_proto = option; |
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break; |
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case Opt_indirect: |
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set_autofs_type_indirect(&sbi->type); |
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break; |
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case Opt_direct: |
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set_autofs_type_direct(&sbi->type); |
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break; |
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case Opt_offset: |
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set_autofs_type_offset(&sbi->type); |
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break; |
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case Opt_strictexpire: |
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sbi->flags |= AUTOFS_SBI_STRICTEXPIRE; |
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break; |
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case Opt_ignore: |
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sbi->flags |= AUTOFS_SBI_IGNORE; |
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break; |
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default: |
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return 1; |
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} |
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} |
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return (sbi->pipefd < 0); |
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} |
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int autofs_fill_super(struct super_block *s, void *data, int silent) |
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{ |
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struct inode *root_inode; |
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struct dentry *root; |
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struct file *pipe; |
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struct autofs_sb_info *sbi; |
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struct autofs_info *ino; |
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int pgrp = 0; |
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bool pgrp_set = false; |
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int ret = -EINVAL; |
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
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if (!sbi) |
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return -ENOMEM; |
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pr_debug("starting up, sbi = %p\n", sbi); |
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s->s_fs_info = sbi; |
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sbi->magic = AUTOFS_SBI_MAGIC; |
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sbi->pipefd = -1; |
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sbi->pipe = NULL; |
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sbi->exp_timeout = 0; |
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sbi->oz_pgrp = NULL; |
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sbi->sb = s; |
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sbi->version = 0; |
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sbi->sub_version = 0; |
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sbi->flags = AUTOFS_SBI_CATATONIC; |
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set_autofs_type_indirect(&sbi->type); |
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sbi->min_proto = 0; |
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sbi->max_proto = 0; |
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mutex_init(&sbi->wq_mutex); |
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mutex_init(&sbi->pipe_mutex); |
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spin_lock_init(&sbi->fs_lock); |
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sbi->queues = NULL; |
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spin_lock_init(&sbi->lookup_lock); |
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INIT_LIST_HEAD(&sbi->active_list); |
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INIT_LIST_HEAD(&sbi->expiring_list); |
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s->s_blocksize = 1024; |
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s->s_blocksize_bits = 10; |
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s->s_magic = AUTOFS_SUPER_MAGIC; |
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s->s_op = &autofs_sops; |
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s->s_d_op = &autofs_dentry_operations; |
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s->s_time_gran = 1; |
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/* |
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* Get the root inode and dentry, but defer checking for errors. |
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*/ |
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ino = autofs_new_ino(sbi); |
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if (!ino) { |
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ret = -ENOMEM; |
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goto fail_free; |
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} |
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root_inode = autofs_get_inode(s, S_IFDIR | 0755); |
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root = d_make_root(root_inode); |
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if (!root) { |
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ret = -ENOMEM; |
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goto fail_ino; |
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} |
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pipe = NULL; |
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root->d_fsdata = ino; |
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/* Can this call block? */ |
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if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) { |
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pr_err("called with bogus options\n"); |
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goto fail_dput; |
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} |
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/* Test versions first */ |
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if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION || |
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sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) { |
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pr_err("kernel does not match daemon version " |
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"daemon (%d, %d) kernel (%d, %d)\n", |
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sbi->min_proto, sbi->max_proto, |
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AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION); |
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goto fail_dput; |
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} |
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/* Establish highest kernel protocol version */ |
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if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION) |
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sbi->version = AUTOFS_MAX_PROTO_VERSION; |
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else |
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sbi->version = sbi->max_proto; |
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sbi->sub_version = AUTOFS_PROTO_SUBVERSION; |
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if (pgrp_set) { |
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sbi->oz_pgrp = find_get_pid(pgrp); |
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if (!sbi->oz_pgrp) { |
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pr_err("could not find process group %d\n", |
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pgrp); |
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goto fail_dput; |
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} |
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} else { |
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sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID); |
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} |
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if (autofs_type_trigger(sbi->type)) |
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__managed_dentry_set_managed(root); |
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root_inode->i_fop = &autofs_root_operations; |
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root_inode->i_op = &autofs_dir_inode_operations; |
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pr_debug("pipe fd = %d, pgrp = %u\n", |
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sbi->pipefd, pid_nr(sbi->oz_pgrp)); |
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pipe = fget(sbi->pipefd); |
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if (!pipe) { |
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pr_err("could not open pipe file descriptor\n"); |
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goto fail_put_pid; |
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} |
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ret = autofs_prepare_pipe(pipe); |
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if (ret < 0) |
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goto fail_fput; |
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sbi->pipe = pipe; |
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sbi->flags &= ~AUTOFS_SBI_CATATONIC; |
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/* |
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* Success! Install the root dentry now to indicate completion. |
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*/ |
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s->s_root = root; |
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return 0; |
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/* |
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* Failure ... clean up. |
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*/ |
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fail_fput: |
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pr_err("pipe file descriptor does not contain proper ops\n"); |
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fput(pipe); |
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fail_put_pid: |
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put_pid(sbi->oz_pgrp); |
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fail_dput: |
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dput(root); |
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goto fail_free; |
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fail_ino: |
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autofs_free_ino(ino); |
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fail_free: |
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kfree(sbi); |
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s->s_fs_info = NULL; |
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return ret; |
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} |
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struct inode *autofs_get_inode(struct super_block *sb, umode_t mode) |
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{ |
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struct inode *inode = new_inode(sb); |
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if (inode == NULL) |
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return NULL; |
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inode->i_mode = mode; |
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if (sb->s_root) { |
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inode->i_uid = d_inode(sb->s_root)->i_uid; |
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inode->i_gid = d_inode(sb->s_root)->i_gid; |
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} |
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
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inode->i_ino = get_next_ino(); |
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if (S_ISDIR(mode)) { |
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set_nlink(inode, 2); |
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inode->i_op = &autofs_dir_inode_operations; |
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inode->i_fop = &autofs_dir_operations; |
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} else if (S_ISLNK(mode)) { |
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inode->i_op = &autofs_symlink_inode_operations; |
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} else |
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WARN_ON(1); |
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return inode; |
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}
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