-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*/
#define DEBUG_SUBSYSTEM S_CLASS
-#define D_KUC 0
+#define D_KUC D_OTHER
#include <libcfs/libcfs.h>
* @param link Private descriptor for pipe/socket.
* @param groups KUC broadcast group to listen to
* (can be null for unicast to this pid)
+ * @param rfd_flags flags for read side of pipe (e.g. O_NONBLOCK)
*/
-int libcfs_ukuc_start(lustre_kernelcomm *link, int group)
+int libcfs_ukuc_start(lustre_kernelcomm *link, int group, int rfd_flags)
{
- int pfd[2];
+ int pfd[2];
+ int rc;
+
+ link->lk_rfd = link->lk_wfd = LK_NOFD;
+
+ if (pipe(pfd) < 0)
+ return -errno;
+
+ if (fcntl(pfd[0], F_SETFL, rfd_flags) < 0) {
+ rc = -errno;
+ close(pfd[0]);
+ close(pfd[1]);
+ return rc;
+ }
+
+ memset(link, 0, sizeof(*link));
+ link->lk_rfd = pfd[0];
+ link->lk_wfd = pfd[1];
+ link->lk_group = group;
+ link->lk_uid = getpid();
+ return 0;
+}
- if (pipe(pfd) < 0)
- return -errno;
+int libcfs_ukuc_stop(lustre_kernelcomm *link)
+{
+ int rc;
- link->lk_rfd = pfd[0];
- link->lk_wfd = pfd[1];
- link->lk_group = group;
- link->lk_uid = getpid();
- return 0;
+ if (link->lk_wfd != LK_NOFD)
+ close(link->lk_wfd);
+ rc = close(link->lk_rfd);
+ link->lk_rfd = link->lk_wfd = LK_NOFD;
+ return rc;
}
-int libcfs_ukuc_stop(lustre_kernelcomm *link)
+/** Returns the file descriptor for the read side of the pipe,
+ * to be used with poll/select.
+ * @param link Private descriptor for pipe/socket.
+ */
+int libcfs_ukuc_get_rfd(lustre_kernelcomm *link)
{
- if (link->lk_wfd > 0)
- close(link->lk_wfd);
- return close(link->lk_rfd);
+ return link->lk_rfd;
}
#define lhsz sizeof(*kuch)
* Allocates memory, returns handle
*
* @param link Private descriptor for pipe/socket.
- * @param buf Buffer to read into
+ * @param buf Buffer to read into, must include size for kuc_hdr
* @param maxsize Maximum message size allowed
* @param transport Only listen to messages on this transport
* (and the generic transport)
}
kuch = (struct kuc_hdr *)buf;
- CDEBUG(D_KUC, " Received message mg=%x t=%d m=%d l=%d\n",
+ CDEBUG(D_KUC, "Received message mg=%x t=%d m=%d l=%d\n",
kuch->kuc_magic, kuch->kuc_transport, kuch->kuc_msgtype,
kuch->kuc_msglen);
* @param payload Payload data. First field of payload is always
* struct kuc_hdr
*/
-int libcfs_kkuc_msg_put(cfs_file_t *filp, void *payload)
+int libcfs_kkuc_msg_put(struct file *filp, void *payload)
{
struct kuc_hdr *kuch = (struct kuc_hdr *)payload;
int rc = -ENOSYS;
}
#ifdef __KERNEL__
- rc = cfs_user_write(filp, (char *)payload, kuch->kuc_msglen, 0);
+ {
+ loff_t offset = 0;
+ rc = filp_user_write(filp, payload, kuch->kuc_msglen,
+ &offset);
+ }
#endif
if (rc < 0)
return rc;
}
-CFS_EXPORT_SYMBOL(libcfs_kkuc_msg_put);
+EXPORT_SYMBOL(libcfs_kkuc_msg_put);
/* Broadcast groups are global across all mounted filesystems;
* i.e. registering for a group on 1 fs will get messages for that
* group from any fs */
-/** A single group reigstration has a uid and a file pointer */
+/** A single group registration has a uid and a file pointer */
struct kkuc_reg {
- cfs_list_t kr_chain;
- int kr_uid;
- cfs_file_t *kr_fp;
+ struct list_head kr_chain;
+ int kr_uid;
+ struct file *kr_fp;
+ void *kr_data;
};
-static cfs_list_t kkuc_groups[KUC_GRP_MAX+1] = {};
+
+static struct list_head kkuc_groups[KUC_GRP_MAX+1] = {};
/* Protect message sending against remove and adds */
-static CFS_DECLARE_RWSEM(kg_sem);
+static DECLARE_RWSEM(kg_sem);
/** Add a receiver to a broadcast group
* @param filp pipe to write into
- * @param uid identidier for this receiver
+ * @param uid identifier for this receiver
* @param group group number
+ * @param data user data
*/
-int libcfs_kkuc_group_add(cfs_file_t *filp, int uid, int group)
+int libcfs_kkuc_group_add(struct file *filp, int uid, int group, void *data)
{
struct kkuc_reg *reg;
return -EBADF;
/* freed in group_rem */
- reg = cfs_alloc(sizeof(*reg), 0);
+ reg = kmalloc(sizeof(*reg), 0);
if (reg == NULL)
return -ENOMEM;
reg->kr_fp = filp;
reg->kr_uid = uid;
+ reg->kr_data = data;
- cfs_down_write(&kg_sem);
- if (kkuc_groups[group].next == NULL)
- CFS_INIT_LIST_HEAD(&kkuc_groups[group]);
- cfs_list_add(®->kr_chain, &kkuc_groups[group]);
- cfs_up_write(&kg_sem);
+ down_write(&kg_sem);
+ if (kkuc_groups[group].next == NULL)
+ INIT_LIST_HEAD(&kkuc_groups[group]);
+ list_add(®->kr_chain, &kkuc_groups[group]);
+ up_write(&kg_sem);
- CDEBUG(D_KUC, "Added uid=%d fp=%p to group %d\n", uid, filp, group);
+ CDEBUG(D_KUC, "Added uid=%d fp=%p to group %d\n", uid, filp, group);
- return 0;
+ return 0;
}
-CFS_EXPORT_SYMBOL(libcfs_kkuc_group_add);
+EXPORT_SYMBOL(libcfs_kkuc_group_add);
-int libcfs_kkuc_group_rem(int uid, int group)
+int libcfs_kkuc_group_rem(int uid, int group, void **pdata)
{
struct kkuc_reg *reg, *next;
ENTRY;
libcfs_kkuc_group_put(group, &lh);
}
- cfs_down_write(&kg_sem);
- cfs_list_for_each_entry_safe(reg, next, &kkuc_groups[group], kr_chain) {
- if ((uid == 0) || (uid == reg->kr_uid)) {
- cfs_list_del(®->kr_chain);
- CDEBUG(D_KUC, "Removed uid=%d fp=%p from group %d\n",
- reg->kr_uid, reg->kr_fp, group);
- cfs_put_file(reg->kr_fp);
- cfs_free(reg);
- }
- }
- cfs_up_write(&kg_sem);
-
- RETURN(0);
+ down_write(&kg_sem);
+ list_for_each_entry_safe(reg, next, &kkuc_groups[group], kr_chain) {
+ if ((uid == 0) || (uid == reg->kr_uid)) {
+ list_del(®->kr_chain);
+ CDEBUG(D_KUC, "Removed uid=%d fp=%p from group %d\n",
+ reg->kr_uid, reg->kr_fp, group);
+ if (reg->kr_fp != NULL)
+ fput(reg->kr_fp);
+ if (pdata != NULL)
+ *pdata = reg->kr_data;
+ kfree(reg);
+ }
+ }
+ up_write(&kg_sem);
+
+ RETURN(0);
}
-CFS_EXPORT_SYMBOL(libcfs_kkuc_group_rem);
+EXPORT_SYMBOL(libcfs_kkuc_group_rem);
int libcfs_kkuc_group_put(int group, void *payload)
{
- struct kkuc_reg *reg;
- int rc = 0;
- ENTRY;
-
- cfs_down_read(&kg_sem);
- cfs_list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
- rc = libcfs_kkuc_msg_put(reg->kr_fp, payload);
- }
- cfs_up_read(&kg_sem);
+ struct kkuc_reg *reg;
+ int rc = 0;
+ int one_success = 0;
+ ENTRY;
+
+ down_read(&kg_sem);
+ list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
+ if (reg->kr_fp != NULL) {
+ rc = libcfs_kkuc_msg_put(reg->kr_fp, payload);
+ if (rc == 0)
+ one_success = 1;
+ else if (rc == -EPIPE) {
+ fput(reg->kr_fp);
+ reg->kr_fp = NULL;
+ }
+ }
+ }
+ up_read(&kg_sem);
+
+ /* don't return an error if the message has been delivered
+ * at least to one agent */
+ if (one_success)
+ rc = 0;
+
+ RETURN(rc);
+}
+EXPORT_SYMBOL(libcfs_kkuc_group_put);
- RETURN(rc);
+/**
+ * Calls a callback function for each link of the given kuc group.
+ * @param group the group to call the function on.
+ * @param cb_func the function to be called.
+ * @param cb_arg extra argument to be passed to the callback function.
+ */
+int libcfs_kkuc_group_foreach(int group, libcfs_kkuc_cb_t cb_func,
+ void *cb_arg)
+{
+ struct kkuc_reg *reg;
+ int rc = 0;
+ ENTRY;
+
+ if (group > KUC_GRP_MAX) {
+ CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group);
+ RETURN(-EINVAL);
+ }
+
+ /* no link for this group */
+ if (kkuc_groups[group].next == NULL)
+ RETURN(0);
+
+ down_read(&kg_sem);
+ list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
+ if (reg->kr_fp != NULL) {
+ rc = cb_func(reg->kr_data, cb_arg);
+ }
+ }
+ up_read(&kg_sem);
+
+ RETURN(rc);
}
-CFS_EXPORT_SYMBOL(libcfs_kkuc_group_put);
+EXPORT_SYMBOL(libcfs_kkuc_group_foreach);
#endif /* LUSTRE_UTILS */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff