netfs: Add a procfile to list in-progress requests
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
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@ -33,6 +33,28 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync);
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* main.c
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* main.c
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*/
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*/
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extern unsigned int netfs_debug;
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extern unsigned int netfs_debug;
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extern struct list_head netfs_io_requests;
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extern spinlock_t netfs_proc_lock;
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#ifdef CONFIG_PROC_FS
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static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq)
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{
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spin_lock(&netfs_proc_lock);
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list_add_tail_rcu(&rreq->proc_link, &netfs_io_requests);
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spin_unlock(&netfs_proc_lock);
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}
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static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq)
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{
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if (!list_empty(&rreq->proc_link)) {
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spin_lock(&netfs_proc_lock);
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list_del_rcu(&rreq->proc_link);
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spin_unlock(&netfs_proc_lock);
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}
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}
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#else
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static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq) {}
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static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq) {}
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#endif
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/*
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/*
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* objects.c
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* objects.c
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@ -21,13 +21,80 @@ unsigned netfs_debug;
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module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO);
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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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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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static int __init netfs_init(void)
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{
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{
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int ret = -ENOMEM;
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int ret = -ENOMEM;
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if (!proc_mkdir("fs/netfs", NULL))
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if (!proc_mkdir("fs/netfs", NULL))
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goto error;
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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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#ifdef CONFIG_FSCACHE_STATS
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if (!proc_create_single("fs/netfs/stats", S_IFREG | 0444, NULL,
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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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netfs_stats_show))
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@ -45,6 +45,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
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}
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}
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}
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}
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netfs_proc_add_rreq(rreq);
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netfs_stat(&netfs_n_rh_rreq);
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netfs_stat(&netfs_n_rh_rreq);
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return rreq;
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return rreq;
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}
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}
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@ -76,12 +77,13 @@ static void netfs_free_request(struct work_struct *work)
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container_of(work, struct netfs_io_request, work);
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container_of(work, struct netfs_io_request, work);
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trace_netfs_rreq(rreq, netfs_rreq_trace_free);
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trace_netfs_rreq(rreq, netfs_rreq_trace_free);
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netfs_proc_del_rreq(rreq);
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netfs_clear_subrequests(rreq, false);
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netfs_clear_subrequests(rreq, false);
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if (rreq->netfs_ops->free_request)
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if (rreq->netfs_ops->free_request)
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rreq->netfs_ops->free_request(rreq);
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rreq->netfs_ops->free_request(rreq);
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if (rreq->cache_resources.ops)
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if (rreq->cache_resources.ops)
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rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
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rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
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kfree(rreq);
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kfree_rcu(rreq, rcu);
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netfs_stat_d(&netfs_n_rh_rreq);
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netfs_stat_d(&netfs_n_rh_rreq);
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}
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}
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@ -175,10 +175,14 @@ enum netfs_io_origin {
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* operations to a variety of data stores and then stitch the result together.
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* operations to a variety of data stores and then stitch the result together.
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*/
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*/
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struct netfs_io_request {
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struct netfs_io_request {
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union {
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struct work_struct work;
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struct work_struct work;
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struct rcu_head rcu;
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};
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struct inode *inode; /* The file being accessed */
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struct inode *inode; /* The file being accessed */
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struct address_space *mapping; /* The mapping being accessed */
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struct address_space *mapping; /* The mapping being accessed */
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struct netfs_cache_resources cache_resources;
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struct netfs_cache_resources cache_resources;
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struct list_head proc_link; /* Link in netfs_iorequests */
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struct list_head subrequests; /* Contributory I/O operations */
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struct list_head subrequests; /* Contributory I/O operations */
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void *netfs_priv; /* Private data for the netfs */
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void *netfs_priv; /* Private data for the netfs */
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unsigned int debug_id;
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unsigned int debug_id;
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