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92 lines
1.9 KiB
92 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Procfs support for lockd |
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* |
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* Copyright (c) 2014 Jeff Layton <[email protected]> |
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*/ |
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#include <linux/fs.h> |
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#include <linux/proc_fs.h> |
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#include <linux/module.h> |
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#include <linux/nsproxy.h> |
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#include <net/net_namespace.h> |
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#include "netns.h" |
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#include "procfs.h" |
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/* |
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* We only allow strings that start with 'Y', 'y', or '1'. |
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*/ |
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static ssize_t |
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nlm_end_grace_write(struct file *file, const char __user *buf, size_t size, |
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loff_t *pos) |
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{ |
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char *data; |
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struct lockd_net *ln = net_generic(current->nsproxy->net_ns, |
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lockd_net_id); |
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if (size < 1) |
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return -EINVAL; |
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data = simple_transaction_get(file, buf, size); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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switch(data[0]) { |
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case 'Y': |
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case 'y': |
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case '1': |
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locks_end_grace(&ln->lockd_manager); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return size; |
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} |
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static ssize_t |
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nlm_end_grace_read(struct file *file, char __user *buf, size_t size, |
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loff_t *pos) |
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{ |
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struct lockd_net *ln = net_generic(current->nsproxy->net_ns, |
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lockd_net_id); |
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char resp[3]; |
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resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N'; |
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resp[1] = '\n'; |
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resp[2] = '\0'; |
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return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp)); |
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} |
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static const struct proc_ops lockd_end_grace_proc_ops = { |
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.proc_write = nlm_end_grace_write, |
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.proc_read = nlm_end_grace_read, |
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.proc_lseek = default_llseek, |
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.proc_release = simple_transaction_release, |
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}; |
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int __init |
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lockd_create_procfs(void) |
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{ |
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struct proc_dir_entry *entry; |
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entry = proc_mkdir("fs/lockd", NULL); |
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if (!entry) |
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return -ENOMEM; |
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entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry, |
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&lockd_end_grace_proc_ops); |
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if (!entry) { |
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remove_proc_entry("fs/lockd", NULL); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
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void __exit |
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lockd_remove_procfs(void) |
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{ |
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remove_proc_entry("fs/lockd/nlm_end_grace", NULL); |
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remove_proc_entry("fs/lockd", NULL); |
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}
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