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87b57a0489
Add a procfile, /proc/fs/netfs/requests, to list in-progress netfslib I/O requests. Signed-off-by: David Howells <dhowells@redhat.com> cc: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Miscellaneous bits for the netfs support library.
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*
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* Copyright (C) 2022 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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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/netfs.h>
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MODULE_DESCRIPTION("Network fs support");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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unsigned netfs_debug;
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module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask");
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#ifdef CONFIG_PROC_FS
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LIST_HEAD(netfs_io_requests);
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DEFINE_SPINLOCK(netfs_proc_lock);
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static const char *netfs_origins[] = {
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[NETFS_READAHEAD] = "RA",
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[NETFS_READPAGE] = "RP",
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[NETFS_READ_FOR_WRITE] = "RW",
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};
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/*
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* Generate a list of I/O requests in /proc/fs/netfs/requests
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*/
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static int netfs_requests_seq_show(struct seq_file *m, void *v)
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{
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struct netfs_io_request *rreq;
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if (v == &netfs_io_requests) {
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seq_puts(m,
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"REQUEST OR REF FL ERR OPS COVERAGE\n"
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"======== == === == ==== === =========\n"
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);
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return 0;
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}
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rreq = list_entry(v, struct netfs_io_request, proc_link);
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seq_printf(m,
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"%08x %s %3d %2lx %4d %3d @%04llx %zx/%zx",
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rreq->debug_id,
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netfs_origins[rreq->origin],
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refcount_read(&rreq->ref),
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rreq->flags,
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rreq->error,
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atomic_read(&rreq->nr_outstanding),
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rreq->start, rreq->submitted, rreq->len);
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seq_putc(m, '\n');
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return 0;
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}
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static void *netfs_requests_seq_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(&netfs_io_requests, *_pos);
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}
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static void *netfs_requests_seq_next(struct seq_file *m, void *v, loff_t *_pos)
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{
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return seq_list_next(v, &netfs_io_requests, _pos);
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}
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static void netfs_requests_seq_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 netfs_requests_seq_ops = {
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.start = netfs_requests_seq_start,
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.next = netfs_requests_seq_next,
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.stop = netfs_requests_seq_stop,
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.show = netfs_requests_seq_show,
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};
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#endif /* CONFIG_PROC_FS */
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static int __init netfs_init(void)
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{
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int ret = -ENOMEM;
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if (!proc_mkdir("fs/netfs", NULL))
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goto error;
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if (!proc_create_seq("fs/netfs/requests", S_IFREG | 0444, NULL,
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&netfs_requests_seq_ops))
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goto error_proc;
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#ifdef CONFIG_FSCACHE_STATS
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if (!proc_create_single("fs/netfs/stats", S_IFREG | 0444, NULL,
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netfs_stats_show))
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goto error_proc;
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#endif
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ret = fscache_init();
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if (ret < 0)
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goto error_proc;
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return 0;
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error_proc:
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remove_proc_entry("fs/netfs", NULL);
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error:
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return ret;
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}
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fs_initcall(netfs_init);
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static void __exit netfs_exit(void)
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{
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fscache_exit();
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remove_proc_entry("fs/netfs", NULL);
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}
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module_exit(netfs_exit);
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