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