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autofs: convert autofs to use the new mount api
Convert the autofs filesystem to use the mount API. The conversion patch was originally written by David Howells. I have taken that patch and broken it into several patches in an effort to make the change easier to review. Signed-off-by: Ian Kent <raven@themaw.net> Reviewed-by: Bill O'Donnell <bodonnel@redhat.com> Message-Id: <20230922041215.13675-8-raven@themaw.net> Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Ian Kent
Christian Brauner
parent
1f50012d9c
commit
e6ec453bd0
3 changed files with 155 additions and 124 deletions
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@ -25,6 +25,8 @@
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#include <linux/completion.h>
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#include <linux/file.h>
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#include <linux/magic.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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/* This is the range of ioctl() numbers we claim as ours */
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#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
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@ -205,7 +207,8 @@ static inline void managed_dentry_clear_managed(struct dentry *dentry)
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/* Initializing function */
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int autofs_fill_super(struct super_block *, void *, int);
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extern const struct fs_parameter_spec autofs_param_specs[];
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int autofs_init_fs_context(struct fs_context *fc);
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struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
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void autofs_clean_ino(struct autofs_info *);
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@ -7,16 +7,11 @@
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#include <linux/init.h>
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#include "autofs_i.h"
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static struct dentry *autofs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return mount_nodev(fs_type, flags, data, autofs_fill_super);
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}
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struct file_system_type autofs_fs_type = {
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.owner = THIS_MODULE,
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.name = "autofs",
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.mount = autofs_mount,
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.init_fs_context = autofs_init_fs_context,
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.parameters = autofs_param_specs,
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.kill_sb = autofs_kill_sb,
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};
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MODULE_ALIAS_FS("autofs");
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@ -6,7 +6,6 @@
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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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@ -111,7 +110,6 @@ static const struct super_operations autofs_sops = {
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};
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enum {
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Opt_err,
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Opt_direct,
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Opt_fd,
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Opt_gid,
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@ -125,100 +123,106 @@ enum {
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Opt_uid,
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};
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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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const struct fs_parameter_spec autofs_param_specs[] = {
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fsparam_flag ("direct", Opt_direct),
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fsparam_fd ("fd", Opt_fd),
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fsparam_u32 ("gid", Opt_gid),
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fsparam_flag ("ignore", Opt_ignore),
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fsparam_flag ("indirect", Opt_indirect),
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fsparam_u32 ("maxproto", Opt_maxproto),
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fsparam_u32 ("minproto", Opt_minproto),
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fsparam_flag ("offset", Opt_offset),
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fsparam_u32 ("pgrp", Opt_pgrp),
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fsparam_flag ("strictexpire", Opt_strictexpire),
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fsparam_u32 ("uid", Opt_uid),
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{}
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};
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static int autofs_parse_fd(struct autofs_sb_info *sbi, int fd)
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struct autofs_fs_context {
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kuid_t uid;
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kgid_t gid;
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int pgrp;
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bool pgrp_set;
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};
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/*
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* Open the fd. We do it here rather than in get_tree so that it's done in the
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* context of the system call that passed the data and not the one that
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* triggered the superblock creation, lest the fd gets reassigned.
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*/
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static int autofs_parse_fd(struct fs_context *fc, struct autofs_sb_info *sbi,
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struct fs_parameter *param,
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struct fs_parse_result *result)
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{
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struct file *pipe;
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int ret;
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pipe = fget(fd);
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if (param->type == fs_value_is_file) {
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/* came through the new api */
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pipe = param->file;
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param->file = NULL;
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} else {
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pipe = fget(result->uint_32);
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}
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if (!pipe) {
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pr_err("could not open pipe file descriptor\n");
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errorf(fc, "could not open pipe file descriptor");
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return -EBADF;
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}
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ret = autofs_check_pipe(pipe);
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if (ret < 0) {
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pr_err("Invalid/unusable pipe\n");
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fput(pipe);
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errorf(fc, "Invalid/unusable pipe");
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if (param->type != fs_value_is_file)
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fput(pipe);
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return -EBADF;
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}
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if (sbi->pipe)
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fput(sbi->pipe);
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sbi->pipefd = fd;
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sbi->pipefd = result->uint_32;
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sbi->pipe = pipe;
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return 0;
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}
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static int autofs_parse_param(char *optstr, struct inode *root,
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int *pgrp, bool *pgrp_set,
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struct autofs_sb_info *sbi)
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static int autofs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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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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struct autofs_fs_context *ctx = fc->fs_private;
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struct autofs_sb_info *sbi = fc->s_fs_info;
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struct fs_parse_result result;
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kuid_t uid;
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kgid_t gid;
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int token;
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int ret;
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int opt;
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token = match_token(optstr, tokens, args);
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switch (token) {
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opt = fs_parse(fc, autofs_param_specs, param, &result);
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if (opt < 0)
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return opt;
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switch (opt) {
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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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ret = autofs_parse_fd(sbi, pipefd);
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if (ret)
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return 1;
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break;
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return autofs_parse_fd(fc, sbi, param, &result);
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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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uid = make_kuid(current_user_ns(), result.uint_32);
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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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return invalfc(fc, "Invalid uid");
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ctx->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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gid = make_kgid(current_user_ns(), result.uint_32);
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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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return invalfc(fc, "Invalid gid");
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ctx->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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ctx->pgrp = result.uint_32;
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ctx->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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sbi->min_proto = result.uint_32;
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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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sbi->max_proto = result.uint_32;
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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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@ -239,29 +243,6 @@ static int autofs_parse_param(char *optstr, struct inode *root,
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return 0;
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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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root->i_uid = current_uid();
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root->i_gid = current_gid();
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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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if (!*p)
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continue;
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if (autofs_parse_param(p, root, pgrp, pgrp_set, sbi))
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return 1;
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}
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return (sbi->pipefd < 0);
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}
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static struct autofs_sb_info *autofs_alloc_sbi(void)
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{
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struct autofs_sb_info *sbi;
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@ -287,12 +268,14 @@ static struct autofs_sb_info *autofs_alloc_sbi(void)
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return sbi;
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}
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static int autofs_validate_protocol(struct autofs_sb_info *sbi)
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static int autofs_validate_protocol(struct fs_context *fc)
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{
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struct autofs_sb_info *sbi = fc->s_fs_info;
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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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errorf(fc, "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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@ -309,24 +292,18 @@ static int autofs_validate_protocol(struct autofs_sb_info *sbi)
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return 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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static int autofs_fill_super(struct super_block *s, struct fs_context *fc)
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{
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struct autofs_fs_context *ctx = fc->fs_private;
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struct autofs_sb_info *sbi = s->s_fs_info;
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struct inode *root_inode;
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struct dentry *root;
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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 = autofs_alloc_sbi();
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if (!sbi)
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return -ENOMEM;
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int ret = -ENOMEM;
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pr_debug("starting up, sbi = %p\n", sbi);
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sbi->sb = s;
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s->s_fs_info = sbi;
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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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@ -338,33 +315,24 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
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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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if (!ino)
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goto fail;
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root_inode = autofs_get_inode(s, S_IFDIR | 0755);
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root_inode->i_uid = ctx->uid;
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root_inode->i_gid = ctx->gid;
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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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if (!root)
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goto fail_ino;
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}
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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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if (autofs_validate_protocol(sbi))
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goto fail_dput;
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if (pgrp_set) {
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sbi->oz_pgrp = find_get_pid(pgrp);
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if (ctx->pgrp_set) {
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sbi->oz_pgrp = find_get_pid(ctx->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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ret = invalf(fc, "Could not find process group %d",
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ctx->pgrp);
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goto fail_dput;
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}
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} else {
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@ -393,15 +361,80 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
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*/
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fail_dput:
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dput(root);
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goto fail_free;
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goto fail;
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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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fail:
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return ret;
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}
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/*
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* Validate the parameters and then request a superblock.
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*/
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static int autofs_get_tree(struct fs_context *fc)
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{
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struct autofs_sb_info *sbi = fc->s_fs_info;
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int ret;
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ret = autofs_validate_protocol(fc);
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if (ret)
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return ret;
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if (sbi->pipefd < 0)
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return invalf(fc, "No control pipe specified");
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return get_tree_nodev(fc, autofs_fill_super);
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}
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static void autofs_free_fc(struct fs_context *fc)
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{
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struct autofs_fs_context *ctx = fc->fs_private;
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struct autofs_sb_info *sbi = fc->s_fs_info;
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if (sbi) {
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if (sbi->pipe)
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fput(sbi->pipe);
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kfree(sbi);
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}
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kfree(ctx);
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}
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static const struct fs_context_operations autofs_context_ops = {
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.free = autofs_free_fc,
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.parse_param = autofs_parse_param,
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.get_tree = autofs_get_tree,
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};
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/*
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* Set up the filesystem mount context.
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*/
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int autofs_init_fs_context(struct fs_context *fc)
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{
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struct autofs_fs_context *ctx;
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struct autofs_sb_info *sbi;
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ctx = kzalloc(sizeof(struct autofs_fs_context), GFP_KERNEL);
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if (!ctx)
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goto nomem;
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ctx->uid = current_uid();
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ctx->gid = current_gid();
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sbi = autofs_alloc_sbi();
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if (!sbi)
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goto nomem_ctx;
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fc->fs_private = ctx;
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fc->s_fs_info = sbi;
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fc->ops = &autofs_context_ops;
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return 0;
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nomem_ctx:
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kfree(ctx);
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nomem:
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return -ENOMEM;
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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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