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@@ -0,0 +1,331 @@
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+/*
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+ * fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats}
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+ *
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+ * In fact, that's a piece of procfs; it's *almost* isolated from
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+ * the rest of fs/proc, but has rather close relationships with
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+ * fs/namespace.c, thus here instead of fs/proc
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+ *
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+ */
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+#include <linux/mnt_namespace.h>
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+#include <linux/nsproxy.h>
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+#include <linux/security.h>
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+#include <linux/fs_struct.h>
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+#include "proc/internal.h" /* only for get_proc_task() in ->open() */
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+
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+#include "pnode.h"
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+#include "internal.h"
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+
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+static unsigned mounts_poll(struct file *file, poll_table *wait)
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+{
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+ struct proc_mounts *p = file->private_data;
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+ struct mnt_namespace *ns = p->ns;
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+ unsigned res = POLLIN | POLLRDNORM;
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+
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+ poll_wait(file, &p->ns->poll, wait);
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+
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+ br_read_lock(vfsmount_lock);
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+ if (p->m.poll_event != ns->event) {
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+ p->m.poll_event = ns->event;
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+ res |= POLLERR | POLLPRI;
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+ }
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+ br_read_unlock(vfsmount_lock);
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+
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+ return res;
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+}
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+
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+struct proc_fs_info {
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+ int flag;
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+ const char *str;
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+};
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+
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+static int show_sb_opts(struct seq_file *m, struct super_block *sb)
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+{
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+ static const struct proc_fs_info fs_info[] = {
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+ { MS_SYNCHRONOUS, ",sync" },
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+ { MS_DIRSYNC, ",dirsync" },
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+ { MS_MANDLOCK, ",mand" },
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+ { 0, NULL }
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+ };
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+ const struct proc_fs_info *fs_infop;
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+
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+ for (fs_infop = fs_info; fs_infop->flag; fs_infop++) {
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+ if (sb->s_flags & fs_infop->flag)
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+ seq_puts(m, fs_infop->str);
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+ }
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+
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+ return security_sb_show_options(m, sb);
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+}
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+
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+static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
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+{
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+ static const struct proc_fs_info mnt_info[] = {
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+ { MNT_NOSUID, ",nosuid" },
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+ { MNT_NODEV, ",nodev" },
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+ { MNT_NOEXEC, ",noexec" },
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+ { MNT_NOATIME, ",noatime" },
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+ { MNT_NODIRATIME, ",nodiratime" },
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+ { MNT_RELATIME, ",relatime" },
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+ { 0, NULL }
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+ };
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+ const struct proc_fs_info *fs_infop;
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+
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+ for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) {
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+ if (mnt->mnt_flags & fs_infop->flag)
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+ seq_puts(m, fs_infop->str);
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+ }
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+}
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+
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+static inline void mangle(struct seq_file *m, const char *s)
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+{
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+ seq_escape(m, s, " \t\n\\");
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+}
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+
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+static void show_type(struct seq_file *m, struct super_block *sb)
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+{
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+ mangle(m, sb->s_type->name);
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+ if (sb->s_subtype && sb->s_subtype[0]) {
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+ seq_putc(m, '.');
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+ mangle(m, sb->s_subtype);
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+ }
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+}
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+
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+static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt)
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+{
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+ struct mount *r = real_mount(mnt);
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+ int err = 0;
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+ struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
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+
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+ if (mnt->mnt_sb->s_op->show_devname) {
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+ err = mnt->mnt_sb->s_op->show_devname(m, mnt);
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+ if (err)
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+ goto out;
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+ } else {
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+ mangle(m, r->mnt_devname ? r->mnt_devname : "none");
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+ }
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+ seq_putc(m, ' ');
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+ seq_path(m, &mnt_path, " \t\n\\");
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+ seq_putc(m, ' ');
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+ show_type(m, mnt->mnt_sb);
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+ seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
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+ err = show_sb_opts(m, mnt->mnt_sb);
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+ if (err)
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+ goto out;
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+ show_mnt_opts(m, mnt);
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+ if (mnt->mnt_sb->s_op->show_options)
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+ err = mnt->mnt_sb->s_op->show_options(m, mnt);
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+ seq_puts(m, " 0 0\n");
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+out:
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+ return err;
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+}
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+
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+static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
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+{
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+ struct proc_mounts *p = m->private;
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+ struct mount *r = real_mount(mnt);
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+ struct super_block *sb = mnt->mnt_sb;
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+ struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
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+ struct path root = p->root;
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+ int err = 0;
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+
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+ seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
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+ MAJOR(sb->s_dev), MINOR(sb->s_dev));
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+ if (sb->s_op->show_path)
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+ err = sb->s_op->show_path(m, mnt);
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+ else
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+ seq_dentry(m, mnt->mnt_root, " \t\n\\");
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+ if (err)
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+ goto out;
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+ seq_putc(m, ' ');
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+
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+ /* mountpoints outside of chroot jail will give SEQ_SKIP on this */
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+ err = seq_path_root(m, &mnt_path, &root, " \t\n\\");
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+ if (err)
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+ goto out;
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+
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+ seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
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+ show_mnt_opts(m, mnt);
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+
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+ /* Tagged fields ("foo:X" or "bar") */
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+ if (IS_MNT_SHARED(r))
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+ seq_printf(m, " shared:%i", r->mnt_group_id);
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+ if (IS_MNT_SLAVE(r)) {
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+ int master = r->mnt_master->mnt_group_id;
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+ int dom = get_dominating_id(r, &p->root);
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+ seq_printf(m, " master:%i", master);
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+ if (dom && dom != master)
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+ seq_printf(m, " propagate_from:%i", dom);
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+ }
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+ if (IS_MNT_UNBINDABLE(r))
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+ seq_puts(m, " unbindable");
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+
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+ /* Filesystem specific data */
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+ seq_puts(m, " - ");
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+ show_type(m, sb);
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+ seq_putc(m, ' ');
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+ if (sb->s_op->show_devname)
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+ err = sb->s_op->show_devname(m, mnt);
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+ else
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+ mangle(m, r->mnt_devname ? r->mnt_devname : "none");
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+ if (err)
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+ goto out;
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+ seq_puts(m, sb->s_flags & MS_RDONLY ? " ro" : " rw");
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+ err = show_sb_opts(m, sb);
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+ if (err)
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+ goto out;
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+ if (sb->s_op->show_options)
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+ err = sb->s_op->show_options(m, mnt);
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+ seq_putc(m, '\n');
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+out:
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+ return err;
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+}
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+
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+static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
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+{
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+ struct mount *r = real_mount(mnt);
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+ struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
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+ int err = 0;
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+
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+ /* device */
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+ if (mnt->mnt_sb->s_op->show_devname) {
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+ seq_puts(m, "device ");
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+ err = mnt->mnt_sb->s_op->show_devname(m, mnt);
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+ } else {
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+ if (r->mnt_devname) {
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+ seq_puts(m, "device ");
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+ mangle(m, r->mnt_devname);
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+ } else
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+ seq_puts(m, "no device");
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+ }
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+
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+ /* mount point */
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+ seq_puts(m, " mounted on ");
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+ seq_path(m, &mnt_path, " \t\n\\");
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+ seq_putc(m, ' ');
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+
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+ /* file system type */
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+ seq_puts(m, "with fstype ");
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+ show_type(m, mnt->mnt_sb);
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+
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+ /* optional statistics */
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+ if (mnt->mnt_sb->s_op->show_stats) {
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+ seq_putc(m, ' ');
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+ if (!err)
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+ err = mnt->mnt_sb->s_op->show_stats(m, mnt);
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+ }
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+
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+ seq_putc(m, '\n');
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+ return err;
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+}
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+
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+static int mounts_open_common(struct inode *inode, struct file *file,
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+ int (*show)(struct seq_file *, struct vfsmount *))
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+{
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+ struct task_struct *task = get_proc_task(inode);
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+ struct nsproxy *nsp;
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+ struct mnt_namespace *ns = NULL;
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+ struct path root;
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+ struct proc_mounts *p;
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+ int ret = -EINVAL;
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+
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+ if (!task)
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+ goto err;
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+
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+ rcu_read_lock();
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+ nsp = task_nsproxy(task);
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+ if (!nsp) {
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+ rcu_read_unlock();
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+ put_task_struct(task);
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+ goto err;
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+ }
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+ ns = nsp->mnt_ns;
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+ if (!ns) {
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+ rcu_read_unlock();
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+ put_task_struct(task);
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+ goto err;
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+ }
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+ get_mnt_ns(ns);
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+ rcu_read_unlock();
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+ task_lock(task);
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+ if (!task->fs) {
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+ task_unlock(task);
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+ put_task_struct(task);
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+ ret = -ENOENT;
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+ goto err_put_ns;
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+ }
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+ get_fs_root(task->fs, &root);
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+ task_unlock(task);
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+ put_task_struct(task);
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+
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+ ret = -ENOMEM;
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+ p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
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+ if (!p)
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+ goto err_put_path;
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+
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+ file->private_data = &p->m;
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+ ret = seq_open(file, &mounts_op);
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+ if (ret)
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+ goto err_free;
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+
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+ p->m.private = p;
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+ p->ns = ns;
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+ p->root = root;
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+ p->m.poll_event = ns->event;
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+ p->show = show;
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+
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+ return 0;
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+
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+ err_free:
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+ kfree(p);
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+ err_put_path:
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+ path_put(&root);
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+ err_put_ns:
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+ put_mnt_ns(ns);
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+ err:
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+ return ret;
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+}
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+
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+static int mounts_release(struct inode *inode, struct file *file)
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+{
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+ struct proc_mounts *p = file->private_data;
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+ path_put(&p->root);
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+ put_mnt_ns(p->ns);
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+ return seq_release(inode, file);
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+}
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+
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+static int mounts_open(struct inode *inode, struct file *file)
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+{
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+ return mounts_open_common(inode, file, show_vfsmnt);
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+}
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+
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+static int mountinfo_open(struct inode *inode, struct file *file)
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+{
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+ return mounts_open_common(inode, file, show_mountinfo);
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+}
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+
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+static int mountstats_open(struct inode *inode, struct file *file)
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+{
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+ return mounts_open_common(inode, file, show_vfsstat);
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+}
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+
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+const struct file_operations proc_mounts_operations = {
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+ .open = mounts_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = mounts_release,
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+ .poll = mounts_poll,
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+};
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+
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+const struct file_operations proc_mountinfo_operations = {
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+ .open = mountinfo_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = mounts_release,
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+ .poll = mounts_poll,
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+};
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+
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+const struct file_operations proc_mountstats_operations = {
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+ .open = mountstats_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = mounts_release,
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+};
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Al Viro