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![David Howells](/assets/img/avatar_default.png)
Show all of a server's addresses in /proc/fs/afs/servers, placing the second plus addresses on padded lines of their own. The current address is marked with a star. Signed-off-by: David Howells <dhowells@redhat.com>
647 lines
14 KiB
C
647 lines
14 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_seq2net(struct seq_file *m)
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{
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return afs_net(seq_file_net(m));
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}
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static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
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{
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return afs_net(seq_file_single_net(m));
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}
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/*
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* Display the list of cells known to the namespace.
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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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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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rcu_read_lock();
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return seq_list_start_head(&afs_seq2net(m)->proc_cells, *_pos);
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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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return seq_list_next(v, &afs_seq2net(m)->proc_cells, pos);
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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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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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/*
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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 int afs_proc_cells_write(struct file *file, char *buf, size_t size)
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{
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struct seq_file *m = file->private_data;
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struct afs_net *net = afs_seq2net(m);
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char *name, *args;
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int ret;
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/* trim to first NL */
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name = memchr(buf, '\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(buf, ' ');
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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", buf, name, args);
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if (strcmp(buf, "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 = 0;
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done:
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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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/*
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* Display the name of the current workstation cell.
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*/
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static int afs_proc_rootcell_show(struct seq_file *m, void *v)
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{
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struct afs_cell *cell;
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struct afs_net *net;
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net = afs_seq2net_single(m);
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if (rcu_access_pointer(net->ws_cell)) {
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rcu_read_lock();
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cell = rcu_dereference(net->ws_cell);
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if (cell)
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seq_printf(m, "%s\n", cell->name);
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rcu_read_unlock();
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}
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return 0;
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}
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/*
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* Set the current workstation cell and optionally supply its list of volume
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* location servers.
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*
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* echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
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*/
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static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
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{
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struct seq_file *m = file->private_data;
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struct afs_net *net = afs_seq2net_single(m);
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char *s;
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int ret;
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ret = -EINVAL;
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if (buf[0] == '.')
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goto out;
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if (memchr(buf, '/', size))
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goto out;
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/* trim to first NL */
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s = memchr(buf, '\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", buf);
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ret = afs_cell_init(net, buf);
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out:
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_leave(" = %d", ret);
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return ret;
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}
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static const char afs_vol_types[3][3] = {
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[AFSVL_RWVOL] = "RW",
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[AFSVL_ROVOL] = "RO",
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[AFSVL_BACKVOL] = "BK",
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};
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/*
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* Display the list of volumes known to a cell.
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*/
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static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
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{
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struct afs_cell *cell = PDE_DATA(file_inode(m->file));
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struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
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/* Display header on line 1 */
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if (v == &cell->proc_volumes) {
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seq_puts(m, "USE VID TY\n");
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return 0;
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}
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seq_printf(m, "%3d %08x %s\n",
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atomic_read(&vol->usage), vol->vid,
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afs_vol_types[vol->type]);
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return 0;
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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 = PDE_DATA(file_inode(m->file));
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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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static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
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loff_t *_pos)
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{
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struct afs_cell *cell = PDE_DATA(file_inode(m->file));
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return seq_list_next(v, &cell->proc_volumes, _pos);
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}
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static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
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__releases(cell->proc_lock)
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{
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struct afs_cell *cell = PDE_DATA(file_inode(m->file));
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read_unlock(&cell->proc_lock);
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}
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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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/*
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* Display the list of Volume Location servers we're using for a cell.
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*/
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static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
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{
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struct sockaddr_rxrpc *addr = v;
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/* display header on line 1 */
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if (v == (void *)1) {
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seq_puts(m, "ADDRESS\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, "%pISp\n", &addr->transport);
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return 0;
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}
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static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
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__acquires(rcu)
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{
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struct afs_addr_list *alist;
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struct afs_cell *cell = PDE_DATA(file_inode(m->file));
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loff_t pos = *_pos;
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rcu_read_lock();
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alist = rcu_dereference(cell->vl_addrs);
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/* allow for the header line */
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if (!pos)
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return (void *) 1;
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pos--;
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if (!alist || pos >= alist->nr_addrs)
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return NULL;
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return alist->addrs + pos;
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}
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static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
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loff_t *_pos)
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{
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struct afs_addr_list *alist;
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struct afs_cell *cell = PDE_DATA(file_inode(m->file));
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loff_t pos;
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alist = rcu_dereference(cell->vl_addrs);
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pos = *_pos;
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(*_pos)++;
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if (!alist || pos >= alist->nr_addrs)
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return NULL;
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return alist->addrs + pos;
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}
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static void afs_proc_cell_vlservers_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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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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/*
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* Display the list of fileservers we're using within a namespace.
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*/
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static int afs_proc_servers_show(struct seq_file *m, void *v)
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{
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struct afs_server *server;
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struct afs_addr_list *alist;
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int i;
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if (v == SEQ_START_TOKEN) {
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seq_puts(m, "UUID USE ADDR\n");
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return 0;
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}
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server = list_entry(v, struct afs_server, proc_link);
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alist = rcu_dereference(server->addresses);
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seq_printf(m, "%pU %3d %pISpc%s\n",
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&server->uuid,
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atomic_read(&server->usage),
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&alist->addrs[0].transport,
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alist->index == 0 ? "*" : "");
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for (i = 1; i < alist->nr_addrs; i++)
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seq_printf(m, " %pISpc%s\n",
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&alist->addrs[i].transport,
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alist->index == i ? "*" : "");
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return 0;
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}
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static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
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__acquires(rcu)
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{
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rcu_read_lock();
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return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
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}
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static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
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{
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return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
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}
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static void afs_proc_servers_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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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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/*
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* Display the list of strings that may be substituted for the @sys pathname
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* macro.
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*/
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static int afs_proc_sysname_show(struct seq_file *m, void *v)
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{
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struct afs_net *net = afs_seq2net(m);
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struct afs_sysnames *sysnames = net->sysnames;
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unsigned int i = (unsigned long)v - 1;
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if (i < sysnames->nr)
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seq_printf(m, "%s\n", sysnames->subs[i]);
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return 0;
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}
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static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
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__acquires(&net->sysnames_lock)
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{
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struct afs_net *net = afs_seq2net(m);
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struct afs_sysnames *names;
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read_lock(&net->sysnames_lock);
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names = net->sysnames;
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if (*pos >= names->nr)
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return NULL;
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return (void *)(unsigned long)(*pos + 1);
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}
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static void *afs_proc_sysname_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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struct afs_sysnames *names = net->sysnames;
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*pos += 1;
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if (*pos >= names->nr)
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return NULL;
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return (void *)(unsigned long)(*pos + 1);
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}
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static void afs_proc_sysname_stop(struct seq_file *m, void *v)
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__releases(&net->sysnames_lock)
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{
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struct afs_net *net = afs_seq2net(m);
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read_unlock(&net->sysnames_lock);
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}
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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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/*
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* Allow the @sys substitution to be configured.
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*/
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static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
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{
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struct afs_sysnames *sysnames, *kill;
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struct seq_file *m = file->private_data;
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struct afs_net *net = afs_seq2net(m);
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char *s, *p, *sub;
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int ret, len;
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sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
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if (!sysnames)
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return -ENOMEM;
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refcount_set(&sysnames->usage, 1);
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kill = sysnames;
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p = buf;
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while ((s = strsep(&p, " \t\n"))) {
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len = strlen(s);
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if (len == 0)
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continue;
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ret = -ENAMETOOLONG;
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if (len >= AFSNAMEMAX)
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goto error;
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if (len >= 4 &&
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s[len - 4] == '@' &&
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s[len - 3] == 's' &&
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s[len - 2] == 'y' &&
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s[len - 1] == 's')
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/* Protect against recursion */
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goto invalid;
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if (s[0] == '.' &&
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(len < 2 || (len == 2 && s[1] == '.')))
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goto invalid;
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if (memchr(s, '/', len))
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goto invalid;
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ret = -EFBIG;
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if (sysnames->nr >= AFS_NR_SYSNAME)
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goto out;
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if (strcmp(s, afs_init_sysname) == 0) {
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sub = (char *)afs_init_sysname;
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} else {
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ret = -ENOMEM;
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sub = kmemdup(s, len + 1, GFP_KERNEL);
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if (!sub)
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goto out;
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}
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sysnames->subs[sysnames->nr] = sub;
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sysnames->nr++;
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}
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if (sysnames->nr == 0) {
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sysnames->subs[0] = sysnames->blank;
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sysnames->nr++;
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}
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write_lock(&net->sysnames_lock);
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kill = net->sysnames;
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net->sysnames = sysnames;
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write_unlock(&net->sysnames_lock);
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ret = 0;
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out:
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afs_put_sysnames(kill);
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return ret;
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invalid:
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ret = -EINVAL;
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error:
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goto out;
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}
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void afs_put_sysnames(struct afs_sysnames *sysnames)
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{
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int i;
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if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
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for (i = 0; i < sysnames->nr; i++)
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if (sysnames->subs[i] != afs_init_sysname &&
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sysnames->subs[i] != sysnames->blank)
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kfree(sysnames->subs[i]);
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}
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}
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/*
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* Display general per-net namespace statistics
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*/
|
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static int afs_proc_stats_show(struct seq_file *m, void *v)
|
|
{
|
|
struct afs_net *net = afs_seq2net_single(m);
|
|
|
|
seq_puts(m, "kAFS statistics\n");
|
|
|
|
seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
|
|
atomic_read(&net->n_lookup),
|
|
atomic_read(&net->n_reval),
|
|
atomic_read(&net->n_inval),
|
|
atomic_read(&net->n_relpg));
|
|
|
|
seq_printf(m, "dir-data: rdpg=%u\n",
|
|
atomic_read(&net->n_read_dir));
|
|
|
|
seq_printf(m, "dir-edit: cr=%u rm=%u\n",
|
|
atomic_read(&net->n_dir_cr),
|
|
atomic_read(&net->n_dir_rm));
|
|
|
|
seq_printf(m, "file-rd : n=%u nb=%lu\n",
|
|
atomic_read(&net->n_fetches),
|
|
atomic_long_read(&net->n_fetch_bytes));
|
|
seq_printf(m, "file-wr : n=%u nb=%lu\n",
|
|
atomic_read(&net->n_stores),
|
|
atomic_long_read(&net->n_store_bytes));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* initialise /proc/fs/afs/<cell>/
|
|
*/
|
|
int afs_proc_cell_setup(struct afs_cell *cell)
|
|
{
|
|
struct proc_dir_entry *dir;
|
|
struct afs_net *net = cell->net;
|
|
|
|
_enter("%p{%s},%p", cell, cell->name, net->proc_afs);
|
|
|
|
dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
|
|
if (!dir)
|
|
goto error_dir;
|
|
|
|
if (!proc_create_net_data("vlservers", 0444, dir,
|
|
&afs_proc_cell_vlservers_ops,
|
|
sizeof(struct seq_net_private),
|
|
cell) ||
|
|
!proc_create_net_data("volumes", 0444, dir,
|
|
&afs_proc_cell_volumes_ops,
|
|
sizeof(struct seq_net_private),
|
|
cell))
|
|
goto error_tree;
|
|
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_tree:
|
|
remove_proc_subtree(cell->name, net->proc_afs);
|
|
error_dir:
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* remove /proc/fs/afs/<cell>/
|
|
*/
|
|
void afs_proc_cell_remove(struct afs_cell *cell)
|
|
{
|
|
struct afs_net *net = cell->net;
|
|
|
|
_enter("");
|
|
remove_proc_subtree(cell->name, net->proc_afs);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* initialise the /proc/fs/afs/ directory
|
|
*/
|
|
int afs_proc_init(struct afs_net *net)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
_enter("");
|
|
|
|
p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
|
|
if (!p)
|
|
goto error_dir;
|
|
|
|
if (!proc_create_net_data_write("cells", 0644, p,
|
|
&afs_proc_cells_ops,
|
|
afs_proc_cells_write,
|
|
sizeof(struct seq_net_private),
|
|
NULL) ||
|
|
!proc_create_net_single_write("rootcell", 0644, p,
|
|
afs_proc_rootcell_show,
|
|
afs_proc_rootcell_write,
|
|
NULL) ||
|
|
!proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
|
|
sizeof(struct seq_net_private)) ||
|
|
!proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
|
|
!proc_create_net_data_write("sysname", 0644, p,
|
|
&afs_proc_sysname_ops,
|
|
afs_proc_sysname_write,
|
|
sizeof(struct seq_net_private),
|
|
NULL))
|
|
goto error_tree;
|
|
|
|
net->proc_afs = p;
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_tree:
|
|
proc_remove(p);
|
|
error_dir:
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* clean up the /proc/fs/afs/ directory
|
|
*/
|
|
void afs_proc_cleanup(struct afs_net *net)
|
|
{
|
|
proc_remove(net->proc_afs);
|
|
net->proc_afs = NULL;
|
|
}
|