vfs: take /proc/*/mounts and friends to fs/proc_namespace.c

rationale: that stuff is far tighter bound to fs/namespace.c than to
the guts of procfs proper.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 7 insertions, 211 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index cd6389387d1f..21a8261256dd 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -898,10 +898,10 @@ void replace_mount_options(struct super_block *sb, char *options)
 EXPORT_SYMBOL(replace_mount_options);
 
 #ifdef CONFIG_PROC_FS
-/* iterator */
+/* iterator; we want it to have access to namespace_sem, thus here... */
 static void *m_start(struct seq_file *m, loff_t *pos)
 {
-        struct proc_mounts *p = m->private;
+        struct proc_mounts *p = container_of(m, struct proc_mounts, m);
 
         down_read(&namespace_sem);
         return seq_list_start(&p->ns->list, *pos);
@@ -909,7 +909,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
 
 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        struct proc_mounts *p = m->private;
+        struct proc_mounts *p = container_of(m, struct proc_mounts, m);
 
         return seq_list_next(v, &p->ns->list, pos);
 }
@@ -919,222 +919,18 @@ static void m_stop(struct seq_file *m, void *v)
         up_read(&namespace_sem);
 }
 
-int mnt_had_events(struct proc_mounts *p)
-{
-        struct mnt_namespace *ns = p->ns;
-        int res = 0;
-
-        br_read_lock(vfsmount_lock);
-        if (p->m.poll_event != ns->event) {
-                p->m.poll_event = ns->event;
-                res = 1;
-        }
-        br_read_unlock(vfsmount_lock);
-
-        return res;
-}
-
-struct proc_fs_info {
-        int flag;
-        const char *str;
-};
-
-static int show_sb_opts(struct seq_file *m, struct super_block *sb)
-{
-        static const struct proc_fs_info fs_info[] = {
-                { MS_SYNCHRONOUS, ",sync" },
-                { MS_DIRSYNC, ",dirsync" },
-                { MS_MANDLOCK, ",mand" },
-                { 0, NULL }
-        };
-        const struct proc_fs_info *fs_infop;
-
-        for (fs_infop = fs_info; fs_infop->flag; fs_infop++) {
-                if (sb->s_flags & fs_infop->flag)
-                        seq_puts(m, fs_infop->str);
-        }
-
-        return security_sb_show_options(m, sb);
-}
-
-static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
-{
-        static const struct proc_fs_info mnt_info[] = {
-                { MNT_NOSUID, ",nosuid" },
-                { MNT_NODEV, ",nodev" },
-                { MNT_NOEXEC, ",noexec" },
-                { MNT_NOATIME, ",noatime" },
-                { MNT_NODIRATIME, ",nodiratime" },
-                { MNT_RELATIME, ",relatime" },
-                { 0, NULL }
-        };
-        const struct proc_fs_info *fs_infop;
-
-        for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) {
-                if (mnt->mnt_flags & fs_infop->flag)
-                        seq_puts(m, fs_infop->str);
-        }
-}
-
-static void show_type(struct seq_file *m, struct super_block *sb)
-{
-        mangle(m, sb->s_type->name);
-        if (sb->s_subtype && sb->s_subtype[0]) {
-                seq_putc(m, '.');
-                mangle(m, sb->s_subtype);
-        }
-}
-
-static int show_vfsmnt(struct seq_file *m, void *v)
+static int m_show(struct seq_file *m, void *v)
 {
+        struct proc_mounts *p = container_of(m, struct proc_mounts, m);
         struct mount *r = list_entry(v, struct mount, mnt_list);
-        struct vfsmount *mnt = &r->mnt;
-        int err = 0;
-        struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
-
-        if (mnt->mnt_sb->s_op->show_devname) {
-                err = mnt->mnt_sb->s_op->show_devname(m, mnt);
-                if (err)
-                        goto out;
-        } else {
-                mangle(m, r->mnt_devname ? r->mnt_devname : "none");
-        }
-        seq_putc(m, ' ');
-        seq_path(m, &mnt_path, " \t\n\\");
-        seq_putc(m, ' ');
-        show_type(m, mnt->mnt_sb);
-        seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
-        err = show_sb_opts(m, mnt->mnt_sb);
-        if (err)
-                goto out;
-        show_mnt_opts(m, mnt);
-        if (mnt->mnt_sb->s_op->show_options)
-                err = mnt->mnt_sb->s_op->show_options(m, mnt);
-        seq_puts(m, " 0 0\n");
-out:
-        return err;
+        return p->show(m, &r->mnt);
 }
 
 const struct seq_operations mounts_op = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
-        .show   = show_vfsmnt
-};
-
-static int show_mountinfo(struct seq_file *m, void *v)
-{
-        struct proc_mounts *p = m->private;
-        struct mount *r = list_entry(v, struct mount, mnt_list);
-        struct vfsmount *mnt = &r->mnt;
-        struct super_block *sb = mnt->mnt_sb;
-        struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
-        struct path root = p->root;
-        int err = 0;
-
-        seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
-                   MAJOR(sb->s_dev), MINOR(sb->s_dev));
-        if (sb->s_op->show_path)
-                err = sb->s_op->show_path(m, mnt);
-        else
-                seq_dentry(m, mnt->mnt_root, " \t\n\\");
-        if (err)
-                goto out;
-        seq_putc(m, ' ');
-
-        /* mountpoints outside of chroot jail will give SEQ_SKIP on this */
-        err = seq_path_root(m, &mnt_path, &root, " \t\n\\");
-        if (err)
-                goto out;
-
-        seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
-        show_mnt_opts(m, mnt);
-
-        /* Tagged fields ("foo:X" or "bar") */
-        if (IS_MNT_SHARED(r))
-                seq_printf(m, " shared:%i", r->mnt_group_id);
-        if (IS_MNT_SLAVE(r)) {
-                int master = r->mnt_master->mnt_group_id;
-                int dom = get_dominating_id(r, &p->root);
-                seq_printf(m, " master:%i", master);
-                if (dom && dom != master)
-                        seq_printf(m, " propagate_from:%i", dom);
-        }
-        if (IS_MNT_UNBINDABLE(r))
-                seq_puts(m, " unbindable");
-
-        /* Filesystem specific data */
-        seq_puts(m, " - ");
-        show_type(m, sb);
-        seq_putc(m, ' ');
-        if (sb->s_op->show_devname)
-                err = sb->s_op->show_devname(m, mnt);
-        else
-                mangle(m, r->mnt_devname ? r->mnt_devname : "none");
-        if (err)
-                goto out;
-        seq_puts(m, sb->s_flags & MS_RDONLY ? " ro" : " rw");
-        err = show_sb_opts(m, sb);
-        if (err)
-                goto out;
-        if (sb->s_op->show_options)
-                err = sb->s_op->show_options(m, mnt);
-        seq_putc(m, '\n');
-out:
-        return err;
-}
-
-const struct seq_operations mountinfo_op = {
-        .start  = m_start,
-        .next   = m_next,
-        .stop   = m_stop,
-        .show   = show_mountinfo,
-};
-
-static int show_vfsstat(struct seq_file *m, void *v)
-{
-        struct mount *r = list_entry(v, struct mount, mnt_list);
-        struct vfsmount *mnt = &r->mnt;
-        struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
-        int err = 0;
-
-        /* device */
-        if (mnt->mnt_sb->s_op->show_devname) {
-                seq_puts(m, "device ");
-                err = mnt->mnt_sb->s_op->show_devname(m, mnt);
-        } else {
-                if (r->mnt_devname) {
-                        seq_puts(m, "device ");
-                        mangle(m, r->mnt_devname);
-                } else
-                        seq_puts(m, "no device");
-        }
-
-        /* mount point */
-        seq_puts(m, " mounted on ");
-        seq_path(m, &mnt_path, " \t\n\\");
-        seq_putc(m, ' ');
-
-        /* file system type */
-        seq_puts(m, "with fstype ");
-        show_type(m, mnt->mnt_sb);
-
-        /* optional statistics */
-        if (mnt->mnt_sb->s_op->show_stats) {
-                seq_putc(m, ' ');
-                if (!err)
-                        err = mnt->mnt_sb->s_op->show_stats(m, mnt);
-        }
-
-        seq_putc(m, '\n');
-        return err;
-}
-
-const struct seq_operations mountstats_op = {
-        .start  = m_start,
-        .next   = m_next,
-        .stop   = m_stop,
-        .show   = show_vfsstat,
+        .show   = m_show,
 };
 #endif  /* CONFIG_PROC_FS */