uml: Create a private mount of proc for mconsole
The mconsole code only ever accesses proc for the initial pid namespace. Instead of depending upon the proc_mnt which is for proc_flush_task have uml create it's own mount of proc instead. This allows proc_flush_task to evolve and remove the need for having a proc_mnt to do it's job. Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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@ -36,6 +36,8 @@
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#include "mconsole_kern.h"
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#include <os.h>
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static struct vfsmount *proc_mnt = NULL;
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static int do_unlink_socket(struct notifier_block *notifier,
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unsigned long what, void *data)
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{
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@ -123,7 +125,7 @@ void mconsole_log(struct mc_request *req)
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void mconsole_proc(struct mc_request *req)
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{
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struct vfsmount *mnt = init_pid_ns.proc_mnt;
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struct vfsmount *mnt = proc_mnt;
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char *buf;
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int len;
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struct file *file;
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@ -134,6 +136,10 @@ void mconsole_proc(struct mc_request *req)
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ptr += strlen("proc");
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ptr = skip_spaces(ptr);
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if (!mnt) {
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mconsole_reply(req, "Proc not available", 1, 0);
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goto out;
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}
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file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY, 0);
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if (IS_ERR(file)) {
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mconsole_reply(req, "Failed to open file", 1, 0);
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@ -683,6 +689,24 @@ void mconsole_stack(struct mc_request *req)
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with_console(req, stack_proc, to);
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}
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static int __init mount_proc(void)
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{
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struct file_system_type *proc_fs_type;
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struct vfsmount *mnt;
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proc_fs_type = get_fs_type("proc");
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if (!proc_fs_type)
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return -ENODEV;
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mnt = kern_mount(proc_fs_type);
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put_filesystem(proc_fs_type);
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if (IS_ERR(mnt))
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return PTR_ERR(mnt);
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proc_mnt = mnt;
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return 0;
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}
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/*
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* Changed by mconsole_setup, which is __setup, and called before SMP is
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* active.
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@ -696,6 +720,8 @@ static int __init mconsole_init(void)
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int err;
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char file[UNIX_PATH_MAX];
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mount_proc();
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if (umid_file_name("mconsole", file, sizeof(file)))
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return -1;
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snprintf(mconsole_socket_name, sizeof(file), "%s", file);
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