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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* /proc interface for AFS
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells ([email protected])
- */
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <linux/proc_fs.h>
- #include <linux/seq_file.h>
- #include <linux/sched.h>
- #include <linux/uaccess.h>
- #include "internal.h"
- struct afs_vl_seq_net_private {
- struct seq_net_private seq; /* Must be first */
- struct afs_vlserver_list *vllist;
- };
- static inline struct afs_net *afs_seq2net(struct seq_file *m)
- {
- return afs_net(seq_file_net(m));
- }
- static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
- {
- return afs_net(seq_file_single_net(m));
- }
- /*
- * Display the list of cells known to the namespace.
- */
- static int afs_proc_cells_show(struct seq_file *m, void *v)
- {
- struct afs_vlserver_list *vllist;
- struct afs_cell *cell;
- if (v == SEQ_START_TOKEN) {
- /* display header on line 1 */
- seq_puts(m, "USE ACT TTL SV ST NAME\n");
- return 0;
- }
- cell = list_entry(v, struct afs_cell, proc_link);
- vllist = rcu_dereference(cell->vl_servers);
- /* display one cell per line on subsequent lines */
- seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
- refcount_read(&cell->ref),
- atomic_read(&cell->active),
- cell->dns_expiry - ktime_get_real_seconds(),
- vllist ? vllist->nr_servers : 0,
- cell->state,
- cell->name);
- return 0;
- }
- static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
- __acquires(rcu)
- {
- rcu_read_lock();
- return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
- }
- static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
- {
- return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
- }
- static void afs_proc_cells_stop(struct seq_file *m, void *v)
- __releases(rcu)
- {
- rcu_read_unlock();
- }
- static const struct seq_operations afs_proc_cells_ops = {
- .start = afs_proc_cells_start,
- .next = afs_proc_cells_next,
- .stop = afs_proc_cells_stop,
- .show = afs_proc_cells_show,
- };
- /*
- * handle writes to /proc/fs/afs/cells
- * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
- */
- static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
- {
- struct seq_file *m = file->private_data;
- struct afs_net *net = afs_seq2net(m);
- char *name, *args;
- int ret;
- /* trim to first NL */
- name = memchr(buf, '\n', size);
- if (name)
- *name = 0;
- /* split into command, name and argslist */
- name = strchr(buf, ' ');
- if (!name)
- goto inval;
- do {
- *name++ = 0;
- } while(*name == ' ');
- if (!*name)
- goto inval;
- args = strchr(name, ' ');
- if (args) {
- do {
- *args++ = 0;
- } while(*args == ' ');
- if (!*args)
- goto inval;
- }
- /* determine command to perform */
- _debug("cmd=%s name=%s args=%s", buf, name, args);
- if (strcmp(buf, "add") == 0) {
- struct afs_cell *cell;
- cell = afs_lookup_cell(net, name, strlen(name), args, true);
- if (IS_ERR(cell)) {
- ret = PTR_ERR(cell);
- goto done;
- }
- if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
- afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
- } else {
- goto inval;
- }
- ret = 0;
- done:
- _leave(" = %d", ret);
- return ret;
- inval:
- ret = -EINVAL;
- printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
- goto done;
- }
- /*
- * Display the name of the current workstation cell.
- */
- static int afs_proc_rootcell_show(struct seq_file *m, void *v)
- {
- struct afs_cell *cell;
- struct afs_net *net;
- net = afs_seq2net_single(m);
- down_read(&net->cells_lock);
- cell = net->ws_cell;
- if (cell)
- seq_printf(m, "%s\n", cell->name);
- up_read(&net->cells_lock);
- return 0;
- }
- /*
- * Set the current workstation cell and optionally supply its list of volume
- * location servers.
- *
- * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
- */
- static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
- {
- struct seq_file *m = file->private_data;
- struct afs_net *net = afs_seq2net_single(m);
- char *s;
- int ret;
- ret = -EINVAL;
- if (buf[0] == '.')
- goto out;
- if (memchr(buf, '/', size))
- goto out;
- /* trim to first NL */
- s = memchr(buf, '\n', size);
- if (s)
- *s = 0;
- /* determine command to perform */
- _debug("rootcell=%s", buf);
- ret = afs_cell_init(net, buf);
- out:
- _leave(" = %d", ret);
- return ret;
- }
- static const char afs_vol_types[3][3] = {
- [AFSVL_RWVOL] = "RW",
- [AFSVL_ROVOL] = "RO",
- [AFSVL_BACKVOL] = "BK",
- };
- /*
- * Display the list of volumes known to a cell.
- */
- static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
- {
- struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
- /* Display header on line 1 */
- if (v == SEQ_START_TOKEN) {
- seq_puts(m, "USE VID TY NAME\n");
- return 0;
- }
- seq_printf(m, "%3d %08llx %s %s\n",
- refcount_read(&vol->ref), vol->vid,
- afs_vol_types[vol->type],
- vol->name);
- return 0;
- }
- static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
- __acquires(cell->proc_lock)
- {
- struct afs_cell *cell = pde_data(file_inode(m->file));
- rcu_read_lock();
- return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
- }
- static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
- loff_t *_pos)
- {
- struct afs_cell *cell = pde_data(file_inode(m->file));
- return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
- }
- static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
- __releases(cell->proc_lock)
- {
- rcu_read_unlock();
- }
- static const struct seq_operations afs_proc_cell_volumes_ops = {
- .start = afs_proc_cell_volumes_start,
- .next = afs_proc_cell_volumes_next,
- .stop = afs_proc_cell_volumes_stop,
- .show = afs_proc_cell_volumes_show,
- };
- static const char *const dns_record_sources[NR__dns_record_source + 1] = {
- [DNS_RECORD_UNAVAILABLE] = "unav",
- [DNS_RECORD_FROM_CONFIG] = "cfg",
- [DNS_RECORD_FROM_DNS_A] = "A",
- [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
- [DNS_RECORD_FROM_DNS_SRV] = "SRV",
- [DNS_RECORD_FROM_NSS] = "nss",
- [NR__dns_record_source] = "[weird]"
- };
- static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
- [DNS_LOOKUP_NOT_DONE] = "no-lookup",
- [DNS_LOOKUP_GOOD] = "good",
- [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
- [DNS_LOOKUP_BAD] = "bad",
- [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
- [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
- [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
- [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
- [NR__dns_lookup_status] = "[weird]"
- };
- /*
- * Display the list of Volume Location servers we're using for a cell.
- */
- static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
- {
- const struct afs_vl_seq_net_private *priv = m->private;
- const struct afs_vlserver_list *vllist = priv->vllist;
- const struct afs_vlserver_entry *entry;
- const struct afs_vlserver *vlserver;
- const struct afs_addr_list *alist;
- int i;
- if (v == SEQ_START_TOKEN) {
- seq_printf(m, "# source %s, status %s\n",
- dns_record_sources[vllist ? vllist->source : 0],
- dns_lookup_statuses[vllist ? vllist->status : 0]);
- return 0;
- }
- entry = v;
- vlserver = entry->server;
- alist = rcu_dereference(vlserver->addresses);
- seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
- vlserver->name, entry->priority, entry->weight,
- dns_record_sources[alist ? alist->source : entry->source],
- dns_lookup_statuses[alist ? alist->status : entry->status]);
- if (alist) {
- for (i = 0; i < alist->nr_addrs; i++)
- seq_printf(m, " %c %pISpc\n",
- alist->preferred == i ? '>' : '-',
- &alist->addrs[i].transport);
- }
- seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
- seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
- vlserver->probe.flags, vlserver->probe.error,
- vlserver->probe.abort_code,
- atomic_read(&vlserver->probe_outstanding));
- return 0;
- }
- static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
- __acquires(rcu)
- {
- struct afs_vl_seq_net_private *priv = m->private;
- struct afs_vlserver_list *vllist;
- struct afs_cell *cell = pde_data(file_inode(m->file));
- loff_t pos = *_pos;
- rcu_read_lock();
- vllist = rcu_dereference(cell->vl_servers);
- priv->vllist = vllist;
- if (pos < 0)
- *_pos = pos = 0;
- if (pos == 0)
- return SEQ_START_TOKEN;
- if (pos - 1 >= vllist->nr_servers)
- return NULL;
- return &vllist->servers[pos - 1];
- }
- static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
- loff_t *_pos)
- {
- struct afs_vl_seq_net_private *priv = m->private;
- struct afs_vlserver_list *vllist = priv->vllist;
- loff_t pos;
- pos = *_pos;
- pos++;
- *_pos = pos;
- if (!vllist || pos - 1 >= vllist->nr_servers)
- return NULL;
- return &vllist->servers[pos - 1];
- }
- static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
- __releases(rcu)
- {
- rcu_read_unlock();
- }
- static const struct seq_operations afs_proc_cell_vlservers_ops = {
- .start = afs_proc_cell_vlservers_start,
- .next = afs_proc_cell_vlservers_next,
- .stop = afs_proc_cell_vlservers_stop,
- .show = afs_proc_cell_vlservers_show,
- };
- /*
- * Display the list of fileservers we're using within a namespace.
- */
- static int afs_proc_servers_show(struct seq_file *m, void *v)
- {
- struct afs_server *server;
- struct afs_addr_list *alist;
- int i;
- if (v == SEQ_START_TOKEN) {
- seq_puts(m, "UUID REF ACT\n");
- return 0;
- }
- server = list_entry(v, struct afs_server, proc_link);
- alist = rcu_dereference(server->addresses);
- seq_printf(m, "%pU %3d %3d\n",
- &server->uuid,
- refcount_read(&server->ref),
- atomic_read(&server->active));
- seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n",
- server->flags, server->rtt, server->cb_s_break);
- seq_printf(m, " - probe: last=%d out=%d\n",
- (int)(jiffies - server->probed_at) / HZ,
- atomic_read(&server->probe_outstanding));
- seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n",
- alist->version, alist->responded, alist->failed);
- for (i = 0; i < alist->nr_addrs; i++)
- seq_printf(m, " [%x] %pISpc%s\n",
- i, &alist->addrs[i].transport,
- alist->preferred == i ? "*" : "");
- return 0;
- }
- static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
- __acquires(rcu)
- {
- rcu_read_lock();
- return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
- }
- static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
- {
- return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
- }
- static void afs_proc_servers_stop(struct seq_file *m, void *v)
- __releases(rcu)
- {
- rcu_read_unlock();
- }
- static const struct seq_operations afs_proc_servers_ops = {
- .start = afs_proc_servers_start,
- .next = afs_proc_servers_next,
- .stop = afs_proc_servers_stop,
- .show = afs_proc_servers_show,
- };
- /*
- * Display the list of strings that may be substituted for the @sys pathname
- * macro.
- */
- 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;
- }
- 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;
- read_lock(&net->sysnames_lock);
- names = net->sysnames;
- 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 const struct seq_operations afs_proc_sysname_ops = {
- .start = afs_proc_sysname_start,
- .next = afs_proc_sysname_next,
- .stop = afs_proc_sysname_stop,
- .show = afs_proc_sysname_show,
- };
- /*
- * Allow the @sys substitution to be configured.
- */
- static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
- {
- struct afs_sysnames *sysnames, *kill;
- struct seq_file *m = file->private_data;
- struct afs_net *net = afs_seq2net(m);
- char *s, *p, *sub;
- int ret, len;
- sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
- if (!sysnames)
- return -ENOMEM;
- refcount_set(&sysnames->usage, 1);
- kill = sysnames;
- p = buf;
- 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++;
- }
- 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);
- ret = 0;
- out:
- afs_put_sysnames(kill);
- return ret;
- invalid:
- ret = -EINVAL;
- error:
- goto out;
- }
- 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]);
- kfree(sysnames);
- }
- }
- /*
- * Display general per-net namespace statistics
- */
- 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 afs_vl_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;
- }
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