From 60a3c3a58e2e01e19ed2b68b415adb12118ac349 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 1 Nov 2018 23:07:25 +0000 Subject: procfs: Move proc_fill_super() to fs/proc/root.c Move proc_fill_super() to fs/proc/root.c as that's where the other superblock stuff is. Signed-off-by: David Howells Reviewed-by: Alexey Dobriyan cc: Alexey Dobriyan Signed-off-by: Al Viro --- fs/proc/root.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) (limited to 'fs/proc/root.c') diff --git a/fs/proc/root.c b/fs/proc/root.c index f4b1a9d2eca6..fe4f64b3250b 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "internal.h" @@ -36,7 +37,7 @@ static const match_table_t tokens = { {Opt_err, NULL}, }; -int proc_parse_options(char *options, struct pid_namespace *pid) +static int proc_parse_options(char *options, struct pid_namespace *pid) { char *p; substring_t args[MAX_OPT_ARGS]; @@ -78,6 +79,54 @@ int proc_parse_options(char *options, struct pid_namespace *pid) return 1; } +static int proc_fill_super(struct super_block *s, void *data, int silent) +{ + struct pid_namespace *ns = get_pid_ns(s->s_fs_info); + struct inode *root_inode; + int ret; + + if (!proc_parse_options(data, ns)) + return -EINVAL; + + /* User space would break if executables or devices appear on proc */ + s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV; + s->s_flags |= SB_NODIRATIME | SB_NOSUID | SB_NOEXEC; + s->s_blocksize = 1024; + s->s_blocksize_bits = 10; + s->s_magic = PROC_SUPER_MAGIC; + s->s_op = &proc_sops; + s->s_time_gran = 1; + + /* + * procfs isn't actually a stacking filesystem; however, there is + * too much magic going on inside it to permit stacking things on + * top of it + */ + s->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; + + /* procfs dentries and inodes don't require IO to create */ + s->s_shrink.seeks = 0; + + pde_get(&proc_root); + root_inode = proc_get_inode(s, &proc_root); + if (!root_inode) { + pr_err("proc_fill_super: get root inode failed\n"); + return -ENOMEM; + } + + s->s_root = d_make_root(root_inode); + if (!s->s_root) { + pr_err("proc_fill_super: allocate dentry failed\n"); + return -ENOMEM; + } + + ret = proc_setup_self(s); + if (ret) { + return ret; + } + return proc_setup_thread_self(s); +} + int proc_remount(struct super_block *sb, int *flags, char *data) { struct pid_namespace *pid = sb->s_fs_info; -- cgit v1.2.3-70-g09d2