37ab636880
Implement @cell substitution handling such that if @cell is seen as a name in a dynamic root mount, then the name of the root cell for that network namespace will be substituted for @cell during lookup. The substitution of @cell for the current net namespace is set by writing the cell name to /proc/fs/afs/rootcell. The value can be obtained by reading the file. For example: # mount -t afs none /kafs -o dyn # echo grand.central.org >/proc/fs/afs/rootcell # ls /kafs/@cell archive/ cvs/ doc/ local/ project/ service/ software/ user/ www/ # cat /proc/fs/afs/rootcell grand.central.org Signed-off-by: David Howells <dhowells@redhat.com>
900 lines
20 KiB
C
900 lines
20 KiB
C
/* /proc interface for AFS
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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static inline struct afs_net *afs_proc2net(struct file *f)
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{
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return &__afs_net;
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}
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static inline struct afs_net *afs_seq2net(struct seq_file *m)
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{
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return &__afs_net; // TODO: use seq_file_net(m)
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}
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static int afs_proc_cells_open(struct inode *inode, struct file *file);
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static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
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static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
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static void afs_proc_cells_stop(struct seq_file *p, void *v);
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static int afs_proc_cells_show(struct seq_file *m, void *v);
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static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
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size_t size, loff_t *_pos);
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static const struct seq_operations afs_proc_cells_ops = {
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.start = afs_proc_cells_start,
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.next = afs_proc_cells_next,
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.stop = afs_proc_cells_stop,
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.show = afs_proc_cells_show,
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};
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static const struct file_operations afs_proc_cells_fops = {
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.open = afs_proc_cells_open,
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.read = seq_read,
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.write = afs_proc_cells_write,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
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size_t size, loff_t *_pos);
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static ssize_t afs_proc_rootcell_write(struct file *file,
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const char __user *buf,
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size_t size, loff_t *_pos);
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static const struct file_operations afs_proc_rootcell_fops = {
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.read = afs_proc_rootcell_read,
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.write = afs_proc_rootcell_write,
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.llseek = no_llseek,
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};
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static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
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static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
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static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
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loff_t *pos);
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static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
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static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
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static const struct seq_operations afs_proc_cell_volumes_ops = {
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.start = afs_proc_cell_volumes_start,
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.next = afs_proc_cell_volumes_next,
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.stop = afs_proc_cell_volumes_stop,
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.show = afs_proc_cell_volumes_show,
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};
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static const struct file_operations afs_proc_cell_volumes_fops = {
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.open = afs_proc_cell_volumes_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int afs_proc_cell_vlservers_open(struct inode *inode,
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struct file *file);
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static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
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static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
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loff_t *pos);
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static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
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static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
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static const struct seq_operations afs_proc_cell_vlservers_ops = {
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.start = afs_proc_cell_vlservers_start,
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.next = afs_proc_cell_vlservers_next,
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.stop = afs_proc_cell_vlservers_stop,
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.show = afs_proc_cell_vlservers_show,
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};
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static const struct file_operations afs_proc_cell_vlservers_fops = {
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.open = afs_proc_cell_vlservers_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int afs_proc_servers_open(struct inode *inode, struct file *file);
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static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos);
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static void *afs_proc_servers_next(struct seq_file *p, void *v,
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loff_t *pos);
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static void afs_proc_servers_stop(struct seq_file *p, void *v);
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static int afs_proc_servers_show(struct seq_file *m, void *v);
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static const struct seq_operations afs_proc_servers_ops = {
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.start = afs_proc_servers_start,
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.next = afs_proc_servers_next,
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.stop = afs_proc_servers_stop,
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.show = afs_proc_servers_show,
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};
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static const struct file_operations afs_proc_servers_fops = {
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.open = afs_proc_servers_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int afs_proc_sysname_open(struct inode *inode, struct file *file);
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static int afs_proc_sysname_release(struct inode *inode, struct file *file);
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static void *afs_proc_sysname_start(struct seq_file *p, loff_t *pos);
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static void *afs_proc_sysname_next(struct seq_file *p, void *v,
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loff_t *pos);
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static void afs_proc_sysname_stop(struct seq_file *p, void *v);
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static int afs_proc_sysname_show(struct seq_file *m, void *v);
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static ssize_t afs_proc_sysname_write(struct file *file,
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const char __user *buf,
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size_t size, loff_t *_pos);
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static const struct seq_operations afs_proc_sysname_ops = {
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.start = afs_proc_sysname_start,
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.next = afs_proc_sysname_next,
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.stop = afs_proc_sysname_stop,
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.show = afs_proc_sysname_show,
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};
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static const struct file_operations afs_proc_sysname_fops = {
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.open = afs_proc_sysname_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = afs_proc_sysname_release,
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.write = afs_proc_sysname_write,
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};
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/*
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* initialise the /proc/fs/afs/ directory
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*/
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int afs_proc_init(struct afs_net *net)
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{
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_enter("");
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net->proc_afs = proc_mkdir("fs/afs", NULL);
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if (!net->proc_afs)
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goto error_dir;
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if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||
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!proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||
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!proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops) ||
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!proc_create("sysname", 0644, net->proc_afs, &afs_proc_sysname_fops))
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goto error_tree;
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_leave(" = 0");
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return 0;
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error_tree:
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proc_remove(net->proc_afs);
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error_dir:
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_leave(" = -ENOMEM");
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return -ENOMEM;
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}
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/*
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* clean up the /proc/fs/afs/ directory
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*/
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void afs_proc_cleanup(struct afs_net *net)
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{
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proc_remove(net->proc_afs);
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net->proc_afs = NULL;
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}
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/*
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* open "/proc/fs/afs/cells" which provides a summary of extant cells
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*/
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static int afs_proc_cells_open(struct inode *inode, struct file *file)
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{
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struct seq_file *m;
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int ret;
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ret = seq_open(file, &afs_proc_cells_ops);
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if (ret < 0)
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return ret;
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m = file->private_data;
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m->private = PDE_DATA(inode);
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return 0;
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}
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/*
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* set up the iterator to start reading from the cells list and return the
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* first item
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*/
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static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
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__acquires(rcu)
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{
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struct afs_net *net = afs_seq2net(m);
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rcu_read_lock();
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return seq_list_start_head(&net->proc_cells, *_pos);
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}
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/*
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* move to next cell in cells list
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*/
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static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct afs_net *net = afs_seq2net(m);
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return seq_list_next(v, &net->proc_cells, pos);
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}
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/*
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* clean up after reading from the cells list
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*/
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static void afs_proc_cells_stop(struct seq_file *m, void *v)
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__releases(rcu)
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{
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rcu_read_unlock();
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}
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/*
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* display a header line followed by a load of cell lines
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*/
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static int afs_proc_cells_show(struct seq_file *m, void *v)
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{
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struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
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struct afs_net *net = afs_seq2net(m);
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if (v == &net->proc_cells) {
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/* display header on line 1 */
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seq_puts(m, "USE NAME\n");
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return 0;
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}
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/* display one cell per line on subsequent lines */
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seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
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return 0;
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}
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/*
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* handle writes to /proc/fs/afs/cells
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* - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
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*/
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static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
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size_t size, loff_t *_pos)
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{
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struct afs_net *net = afs_proc2net(file);
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char *kbuf, *name, *args;
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int ret;
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/* start by dragging the command into memory */
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if (size <= 1 || size >= PAGE_SIZE)
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return -EINVAL;
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kbuf = memdup_user_nul(buf, size);
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if (IS_ERR(kbuf))
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return PTR_ERR(kbuf);
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/* trim to first NL */
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name = memchr(kbuf, '\n', size);
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if (name)
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*name = 0;
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/* split into command, name and argslist */
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name = strchr(kbuf, ' ');
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if (!name)
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goto inval;
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do {
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*name++ = 0;
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} while(*name == ' ');
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if (!*name)
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goto inval;
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args = strchr(name, ' ');
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if (!args)
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goto inval;
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do {
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*args++ = 0;
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} while(*args == ' ');
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if (!*args)
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goto inval;
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/* determine command to perform */
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_debug("cmd=%s name=%s args=%s", kbuf, name, args);
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if (strcmp(kbuf, "add") == 0) {
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struct afs_cell *cell;
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cell = afs_lookup_cell(net, name, strlen(name), args, true);
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if (IS_ERR(cell)) {
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ret = PTR_ERR(cell);
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goto done;
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}
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if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
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afs_put_cell(net, cell);
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printk("kAFS: Added new cell '%s'\n", name);
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} else {
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goto inval;
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}
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ret = size;
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done:
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kfree(kbuf);
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_leave(" = %d", ret);
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return ret;
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inval:
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ret = -EINVAL;
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printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
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goto done;
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}
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static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
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size_t size, loff_t *_pos)
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{
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struct afs_cell *cell;
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struct afs_net *net = afs_proc2net(file);
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unsigned int seq = 0;
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char name[AFS_MAXCELLNAME + 1];
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int len;
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if (*_pos > 0)
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return 0;
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if (!net->ws_cell)
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return 0;
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rcu_read_lock();
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do {
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read_seqbegin_or_lock(&net->cells_lock, &seq);
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len = 0;
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cell = rcu_dereference_raw(net->ws_cell);
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if (cell) {
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len = cell->name_len;
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memcpy(name, cell->name, len);
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}
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} while (need_seqretry(&net->cells_lock, seq));
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done_seqretry(&net->cells_lock, seq);
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rcu_read_unlock();
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if (!len)
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return 0;
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name[len++] = '\n';
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if (len > size)
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len = size;
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if (copy_to_user(buf, name, len) != 0)
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return -EFAULT;
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*_pos = 1;
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return len;
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}
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/*
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* handle writes to /proc/fs/afs/rootcell
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* - to initialize rootcell: echo "cell.name:192.168.231.14"
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*/
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static ssize_t afs_proc_rootcell_write(struct file *file,
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const char __user *buf,
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size_t size, loff_t *_pos)
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{
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struct afs_net *net = afs_proc2net(file);
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char *kbuf, *s;
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int ret;
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/* start by dragging the command into memory */
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if (size <= 1 || size >= PAGE_SIZE)
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return -EINVAL;
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kbuf = memdup_user_nul(buf, size);
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if (IS_ERR(kbuf))
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return PTR_ERR(kbuf);
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ret = -EINVAL;
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if (kbuf[0] == '.')
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goto out;
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if (memchr(kbuf, '/', size))
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goto out;
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/* trim to first NL */
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s = memchr(kbuf, '\n', size);
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if (s)
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*s = 0;
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/* determine command to perform */
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_debug("rootcell=%s", kbuf);
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ret = afs_cell_init(net, kbuf);
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if (ret >= 0)
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ret = size; /* consume everything, always */
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out:
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kfree(kbuf);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* initialise /proc/fs/afs/<cell>/
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*/
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int afs_proc_cell_setup(struct afs_net *net, struct afs_cell *cell)
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{
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struct proc_dir_entry *dir;
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_enter("%p{%s},%p", cell, cell->name, net->proc_afs);
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dir = proc_mkdir(cell->name, net->proc_afs);
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if (!dir)
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goto error_dir;
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if (!proc_create_data("vlservers", 0, dir,
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&afs_proc_cell_vlservers_fops, cell) ||
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!proc_create_data("volumes", 0, dir,
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&afs_proc_cell_volumes_fops, cell))
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goto error_tree;
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_leave(" = 0");
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return 0;
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error_tree:
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remove_proc_subtree(cell->name, net->proc_afs);
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error_dir:
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_leave(" = -ENOMEM");
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return -ENOMEM;
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}
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/*
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* remove /proc/fs/afs/<cell>/
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*/
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void afs_proc_cell_remove(struct afs_net *net, struct afs_cell *cell)
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{
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_enter("");
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remove_proc_subtree(cell->name, net->proc_afs);
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_leave("");
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}
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/*
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* open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
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*/
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static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
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{
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struct afs_cell *cell;
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struct seq_file *m;
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int ret;
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cell = PDE_DATA(inode);
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if (!cell)
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return -ENOENT;
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ret = seq_open(file, &afs_proc_cell_volumes_ops);
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if (ret < 0)
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return ret;
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m = file->private_data;
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m->private = cell;
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return 0;
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}
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/*
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* set up the iterator to start reading from the cells list and return the
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* first item
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*/
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static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
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__acquires(cell->proc_lock)
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{
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struct afs_cell *cell = m->private;
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_enter("cell=%p pos=%Ld", cell, *_pos);
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read_lock(&cell->proc_lock);
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return seq_list_start_head(&cell->proc_volumes, *_pos);
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}
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|
/*
|
|
* move to next cell in cells list
|
|
*/
|
|
static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
|
|
loff_t *_pos)
|
|
{
|
|
struct afs_cell *cell = p->private;
|
|
|
|
_enter("cell=%p pos=%Ld", cell, *_pos);
|
|
return seq_list_next(v, &cell->proc_volumes, _pos);
|
|
}
|
|
|
|
/*
|
|
* clean up after reading from the cells list
|
|
*/
|
|
static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
|
|
__releases(cell->proc_lock)
|
|
{
|
|
struct afs_cell *cell = p->private;
|
|
|
|
read_unlock(&cell->proc_lock);
|
|
}
|
|
|
|
static const char afs_vol_types[3][3] = {
|
|
[AFSVL_RWVOL] = "RW",
|
|
[AFSVL_ROVOL] = "RO",
|
|
[AFSVL_BACKVOL] = "BK",
|
|
};
|
|
|
|
/*
|
|
* display a header line followed by a load of volume lines
|
|
*/
|
|
static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
|
|
{
|
|
struct afs_cell *cell = m->private;
|
|
struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
|
|
|
|
/* Display header on line 1 */
|
|
if (v == &cell->proc_volumes) {
|
|
seq_puts(m, "USE VID TY\n");
|
|
return 0;
|
|
}
|
|
|
|
seq_printf(m, "%3d %08x %s\n",
|
|
atomic_read(&vol->usage), vol->vid,
|
|
afs_vol_types[vol->type]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
|
|
* location server
|
|
*/
|
|
static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct afs_cell *cell;
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
cell = PDE_DATA(inode);
|
|
if (!cell)
|
|
return -ENOENT;
|
|
|
|
ret = seq_open(file, &afs_proc_cell_vlservers_ops);
|
|
if (ret<0)
|
|
return ret;
|
|
|
|
m = file->private_data;
|
|
m->private = cell;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* set up the iterator to start reading from the cells list and return the
|
|
* first item
|
|
*/
|
|
static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
|
|
__acquires(rcu)
|
|
{
|
|
struct afs_addr_list *alist;
|
|
struct afs_cell *cell = m->private;
|
|
loff_t pos = *_pos;
|
|
|
|
rcu_read_lock();
|
|
|
|
alist = rcu_dereference(cell->vl_addrs);
|
|
|
|
/* allow for the header line */
|
|
if (!pos)
|
|
return (void *) 1;
|
|
pos--;
|
|
|
|
if (!alist || pos >= alist->nr_addrs)
|
|
return NULL;
|
|
|
|
return alist->addrs + pos;
|
|
}
|
|
|
|
/*
|
|
* move to next cell in cells list
|
|
*/
|
|
static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
|
|
loff_t *_pos)
|
|
{
|
|
struct afs_addr_list *alist;
|
|
struct afs_cell *cell = p->private;
|
|
loff_t pos;
|
|
|
|
alist = rcu_dereference(cell->vl_addrs);
|
|
|
|
pos = *_pos;
|
|
(*_pos)++;
|
|
if (!alist || pos >= alist->nr_addrs)
|
|
return NULL;
|
|
|
|
return alist->addrs + pos;
|
|
}
|
|
|
|
/*
|
|
* clean up after reading from the cells list
|
|
*/
|
|
static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
|
|
__releases(rcu)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/*
|
|
* display a header line followed by a load of volume lines
|
|
*/
|
|
static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
|
|
{
|
|
struct sockaddr_rxrpc *addr = v;
|
|
|
|
/* display header on line 1 */
|
|
if (v == (void *)1) {
|
|
seq_puts(m, "ADDRESS\n");
|
|
return 0;
|
|
}
|
|
|
|
/* display one cell per line on subsequent lines */
|
|
seq_printf(m, "%pISp\n", &addr->transport);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* open "/proc/fs/afs/servers" which provides a summary of active
|
|
* servers
|
|
*/
|
|
static int afs_proc_servers_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &afs_proc_servers_ops);
|
|
}
|
|
|
|
/*
|
|
* Set up the iterator to start reading from the server list and return the
|
|
* first item.
|
|
*/
|
|
static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
|
|
__acquires(rcu)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
|
|
rcu_read_lock();
|
|
return seq_hlist_start_head_rcu(&net->fs_proc, *_pos);
|
|
}
|
|
|
|
/*
|
|
* move to next cell in cells list
|
|
*/
|
|
static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
|
|
return seq_hlist_next_rcu(v, &net->fs_proc, _pos);
|
|
}
|
|
|
|
/*
|
|
* clean up after reading from the cells list
|
|
*/
|
|
static void afs_proc_servers_stop(struct seq_file *p, void *v)
|
|
__releases(rcu)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/*
|
|
* display a header line followed by a load of volume lines
|
|
*/
|
|
static int afs_proc_servers_show(struct seq_file *m, void *v)
|
|
{
|
|
struct afs_server *server;
|
|
struct afs_addr_list *alist;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(m, "UUID USE ADDR\n");
|
|
return 0;
|
|
}
|
|
|
|
server = list_entry(v, struct afs_server, proc_link);
|
|
alist = rcu_dereference(server->addresses);
|
|
seq_printf(m, "%pU %3d %pISp\n",
|
|
&server->uuid,
|
|
atomic_read(&server->usage),
|
|
&alist->addrs[alist->index].transport);
|
|
return 0;
|
|
}
|
|
|
|
void afs_put_sysnames(struct afs_sysnames *sysnames)
|
|
{
|
|
int i;
|
|
|
|
if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
|
|
for (i = 0; i < sysnames->nr; i++)
|
|
if (sysnames->subs[i] != afs_init_sysname &&
|
|
sysnames->subs[i] != sysnames->blank)
|
|
kfree(sysnames->subs[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle opening of /proc/fs/afs/sysname. If it is opened for writing, we
|
|
* assume the caller wants to change the substitution list and we allocate a
|
|
* buffer to hold the list.
|
|
*/
|
|
static int afs_proc_sysname_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct afs_sysnames *sysnames;
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
ret = seq_open(file, &afs_proc_sysname_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (file->f_mode & FMODE_WRITE) {
|
|
sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
|
|
if (!sysnames) {
|
|
seq_release(inode, file);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
refcount_set(&sysnames->usage, 1);
|
|
m = file->private_data;
|
|
m->private = sysnames;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle writes to /proc/fs/afs/sysname to set the @sys substitution.
|
|
*/
|
|
static ssize_t afs_proc_sysname_write(struct file *file,
|
|
const char __user *buf,
|
|
size_t size, loff_t *_pos)
|
|
{
|
|
struct afs_sysnames *sysnames;
|
|
struct seq_file *m = file->private_data;
|
|
char *kbuf = NULL, *s, *p, *sub;
|
|
int ret, len;
|
|
|
|
sysnames = m->private;
|
|
if (!sysnames)
|
|
return -EINVAL;
|
|
if (sysnames->error)
|
|
return sysnames->error;
|
|
|
|
if (size >= PAGE_SIZE - 1) {
|
|
sysnames->error = -EINVAL;
|
|
return -EINVAL;
|
|
}
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
kbuf = memdup_user_nul(buf, size);
|
|
if (IS_ERR(kbuf))
|
|
return PTR_ERR(kbuf);
|
|
|
|
inode_lock(file_inode(file));
|
|
|
|
p = kbuf;
|
|
while ((s = strsep(&p, " \t\n"))) {
|
|
len = strlen(s);
|
|
if (len == 0)
|
|
continue;
|
|
ret = -ENAMETOOLONG;
|
|
if (len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
if (len >= 4 &&
|
|
s[len - 4] == '@' &&
|
|
s[len - 3] == 's' &&
|
|
s[len - 2] == 'y' &&
|
|
s[len - 1] == 's')
|
|
/* Protect against recursion */
|
|
goto invalid;
|
|
|
|
if (s[0] == '.' &&
|
|
(len < 2 || (len == 2 && s[1] == '.')))
|
|
goto invalid;
|
|
|
|
if (memchr(s, '/', len))
|
|
goto invalid;
|
|
|
|
ret = -EFBIG;
|
|
if (sysnames->nr >= AFS_NR_SYSNAME)
|
|
goto out;
|
|
|
|
if (strcmp(s, afs_init_sysname) == 0) {
|
|
sub = (char *)afs_init_sysname;
|
|
} else {
|
|
ret = -ENOMEM;
|
|
sub = kmemdup(s, len + 1, GFP_KERNEL);
|
|
if (!sub)
|
|
goto out;
|
|
}
|
|
|
|
sysnames->subs[sysnames->nr] = sub;
|
|
sysnames->nr++;
|
|
}
|
|
|
|
ret = size; /* consume everything, always */
|
|
out:
|
|
inode_unlock(file_inode(file));
|
|
kfree(kbuf);
|
|
return ret;
|
|
|
|
invalid:
|
|
ret = -EINVAL;
|
|
error:
|
|
sysnames->error = ret;
|
|
goto out;
|
|
}
|
|
|
|
static int afs_proc_sysname_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct afs_sysnames *sysnames, *kill = NULL;
|
|
struct seq_file *m = file->private_data;
|
|
struct afs_net *net = afs_seq2net(m);
|
|
|
|
sysnames = m->private;
|
|
if (sysnames) {
|
|
if (!sysnames->error) {
|
|
kill = sysnames;
|
|
if (sysnames->nr == 0) {
|
|
sysnames->subs[0] = sysnames->blank;
|
|
sysnames->nr++;
|
|
}
|
|
write_lock(&net->sysnames_lock);
|
|
kill = net->sysnames;
|
|
net->sysnames = sysnames;
|
|
write_unlock(&net->sysnames_lock);
|
|
}
|
|
afs_put_sysnames(kill);
|
|
}
|
|
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
|
|
__acquires(&net->sysnames_lock)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
struct afs_sysnames *names = net->sysnames;
|
|
|
|
read_lock(&net->sysnames_lock);
|
|
|
|
if (*pos >= names->nr)
|
|
return NULL;
|
|
return (void *)(unsigned long)(*pos + 1);
|
|
}
|
|
|
|
static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
struct afs_sysnames *names = net->sysnames;
|
|
|
|
*pos += 1;
|
|
if (*pos >= names->nr)
|
|
return NULL;
|
|
return (void *)(unsigned long)(*pos + 1);
|
|
}
|
|
|
|
static void afs_proc_sysname_stop(struct seq_file *m, void *v)
|
|
__releases(&net->sysnames_lock)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
|
|
read_unlock(&net->sysnames_lock);
|
|
}
|
|
|
|
static int afs_proc_sysname_show(struct seq_file *m, void *v)
|
|
{
|
|
struct afs_net *net = afs_seq2net(m);
|
|
struct afs_sysnames *sysnames = net->sysnames;
|
|
unsigned int i = (unsigned long)v - 1;
|
|
|
|
if (i < sysnames->nr)
|
|
seq_printf(m, "%s\n", sysnames->subs[i]);
|
|
return 0;
|
|
}
|