| /* /proc interface for AFS |
| * |
| * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #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 TTL SV 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 %6lld %2u %s\n", |
| atomic_read(&cell->usage), |
| cell->dns_expiry - ktime_get_real_seconds(), |
| vllist->nr_servers, |
| 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_put_cell(net, cell); |
| } 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); |
| if (rcu_access_pointer(net->ws_cell)) { |
| rcu_read_lock(); |
| cell = rcu_dereference(net->ws_cell); |
| if (cell) |
| seq_printf(m, "%s\n", cell->name); |
| rcu_read_unlock(); |
| } |
| 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_cell *cell = PDE_DATA(file_inode(m->file)); |
| 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 %08llx %s\n", |
| atomic_read(&vol->usage), vol->vid, |
| afs_vol_types[vol->type]); |
| |
| 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)); |
| |
| read_lock(&cell->proc_lock); |
| return seq_list_start_head(&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_list_next(v, &cell->proc_volumes, _pos); |
| } |
| |
| static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v) |
| __releases(cell->proc_lock) |
| { |
| struct afs_cell *cell = PDE_DATA(file_inode(m->file)); |
| |
| read_unlock(&cell->proc_lock); |
| } |
| |
| 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); |
| } |
| 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 USE ADDR\n"); |
| return 0; |
| } |
| |
| server = list_entry(v, struct afs_server, proc_link); |
| alist = rcu_dereference(server->addresses); |
| seq_printf(m, "%pU %3d %pISpc%s\n", |
| &server->uuid, |
| atomic_read(&server->usage), |
| &alist->addrs[0].transport, |
| alist->preferred == 0 ? "*" : ""); |
| for (i = 1; i < alist->nr_addrs; i++) |
| seq_printf(m, " %pISpc%s\n", |
| &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]); |
| } |
| } |
| |
| /* |
| * 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; |
| } |