* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2015, Intel Corporation.
+ * Copyright (c) 2015, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*/
#define DEBUG_SUBSYSTEM S_CLASS
-#define D_KUC D_OTHER
+
+#include <linux/file.h>
#include <obd_support.h>
#include <lustre_kernelcomm.h>
-/* write a userspace buffer to disk.
- * NOTE: this returns 0 on success, not the number of bytes written. */
-static ssize_t
-filp_user_write(struct file *filp, const void *buf, size_t count,
- loff_t *offset)
-{
- mm_segment_t fs;
- ssize_t size = 0;
-
- fs = get_fs();
- set_fs(KERNEL_DS);
- while ((ssize_t)count > 0) {
- size = vfs_write(filp, (const void __user *)buf, count, offset);
- if (size < 0)
- break;
- count -= size;
- buf += size;
- size = 0;
- }
- set_fs(fs);
-
- return size;
-}
-
/**
* libcfs_kkuc_msg_put - send an message from kernel to userspace
* @param fp to send the message to
int libcfs_kkuc_msg_put(struct file *filp, void *payload)
{
struct kuc_hdr *kuch = (struct kuc_hdr *)payload;
- int rc = -ENOSYS;
+ ssize_t count = kuch->kuc_msglen;
loff_t offset = 0;
+ int rc = 0;
- if (filp == NULL || IS_ERR(filp))
+ if (IS_ERR_OR_NULL(filp))
return -EBADF;
if (kuch->kuc_magic != KUC_MAGIC) {
return -ENOSYS;
}
- rc = filp_user_write(filp, payload, kuch->kuc_msglen, &offset);
+ while (count > 0) {
+ rc = cfs_kernel_write(filp, payload, count, &offset);
+ if (rc < 0)
+ break;
+ count -= rc;
+ payload += rc;
+ rc = 0;
+ }
+
if (rc < 0)
CWARN("message send failed (%d)\n", rc);
else
- CDEBUG(D_KUC, "Sent message rc=%d, fp=%p\n", rc, filp);
+ CDEBUG(D_HSM, "Sent message rc=%d, fp=%p\n", rc, filp);
return rc;
}
/** A single group registration has a uid and a file pointer */
struct kkuc_reg {
struct list_head kr_chain;
+ struct obd_uuid kr_uuid;
int kr_uid;
struct file *kr_fp;
char kr_data[0];
};
-static struct list_head kkuc_groups[KUC_GRP_MAX+1] = {};
+static struct list_head kkuc_groups[KUC_GRP_MAX + 1];
/* Protect message sending against remove and adds */
static DECLARE_RWSEM(kg_sem);
+static inline bool libcfs_kkuc_group_is_valid(int group)
+{
+ return 0 <= group && group < ARRAY_SIZE(kkuc_groups);
+}
+
+void libcfs_kkuc_init(void)
+{
+ int group;
+
+ for (group = 0; group < ARRAY_SIZE(kkuc_groups); group++)
+ INIT_LIST_HEAD(&kkuc_groups[group]);
+}
+
/** Add a receiver to a broadcast group
* @param filp pipe to write into
* @param uid identifier for this receiver
* @param group group number
* @param data user data
*/
-int libcfs_kkuc_group_add(struct file *filp, int uid, int group,
- void *data, size_t data_len)
+int libcfs_kkuc_group_add(struct file *filp, const struct obd_uuid *uuid,
+ int uid, int group, void *data, size_t data_len)
{
struct kkuc_reg *reg;
- if (group > KUC_GRP_MAX) {
+ if (!libcfs_kkuc_group_is_valid(group)) {
CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group);
return -EINVAL;
}
return -EBADF;
/* freed in group_rem */
- reg = kmalloc(sizeof(*reg) + data_len, 0);
+ reg = kzalloc(sizeof(*reg) + data_len, 0);
if (reg == NULL)
return -ENOMEM;
+ reg->kr_uuid = *uuid;
reg->kr_fp = filp;
reg->kr_uid = uid;
memcpy(reg->kr_data, data, data_len);
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_HSM, "Added uid=%d fp=%p to group %d\n", uid, filp, group);
return 0;
}
EXPORT_SYMBOL(libcfs_kkuc_group_add);
-int libcfs_kkuc_group_rem(int uid, int group)
+int libcfs_kkuc_group_rem(const struct obd_uuid *uuid, int uid, int group)
{
struct kkuc_reg *reg, *next;
ENTRY;
- if (kkuc_groups[group].next == NULL)
- RETURN(0);
+ if (!libcfs_kkuc_group_is_valid(group)) {
+ CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group);
+ return -EINVAL;
+ }
if (uid == 0) {
/* Broadcast a shutdown message */
lh.kuc_transport = KUC_TRANSPORT_GENERIC;
lh.kuc_msgtype = KUC_MSG_SHUTDOWN;
lh.kuc_msglen = sizeof(lh);
- libcfs_kkuc_group_put(group, &lh);
+ libcfs_kkuc_group_put(uuid, group, &lh);
}
down_write(&kg_sem);
list_for_each_entry_safe(reg, next, &kkuc_groups[group], kr_chain) {
- if ((uid == 0) || (uid == reg->kr_uid)) {
+ if (obd_uuid_equals(uuid, ®->kr_uuid) &&
+ (uid == 0 || uid == reg->kr_uid)) {
list_del(®->kr_chain);
- CDEBUG(D_KUC, "Removed uid=%d fp=%p from group %d\n",
+ CDEBUG(D_HSM, "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);
}
EXPORT_SYMBOL(libcfs_kkuc_group_rem);
-int libcfs_kkuc_group_put(int group, void *payload)
+int libcfs_kkuc_group_put(const struct obd_uuid *uuid, int group, void *payload)
{
struct kkuc_reg *reg;
int rc = 0;
int one_success = 0;
ENTRY;
+ if (!libcfs_kkuc_group_is_valid(group)) {
+ CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group);
+ return -EINVAL;
+ }
+
down_write(&kg_sem);
+
+ if (unlikely(list_empty(&kkuc_groups[group])) ||
+ unlikely(OBD_FAIL_CHECK(OBD_FAIL_MDS_HSM_CT_REGISTER_NET))) {
+ /* no agent have fully registered, CDT will retry */
+ up_write(&kg_sem);
+ RETURN(-EAGAIN);
+ }
+
list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
- if (reg->kr_fp != NULL) {
+ if (obd_uuid_equals(uuid, ®->kr_uuid) &&
+ reg->kr_fp != NULL) {
rc = libcfs_kkuc_msg_put(reg->kr_fp, payload);
if (rc == 0)
one_success = 1;
* @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)
+int libcfs_kkuc_group_foreach(const struct obd_uuid *uuid, int group,
+ libcfs_kkuc_cb_t cb_func, void *cb_arg)
{
struct kkuc_reg *reg;
int rc = 0;
ENTRY;
- if (group > KUC_GRP_MAX) {
+ if (!libcfs_kkuc_group_is_valid(group)) {
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)
+ if (obd_uuid_equals(uuid, ®->kr_uuid) && reg->kr_fp != NULL)
rc = cb_func(reg->kr_data, cb_arg);
}
up_read(&kg_sem);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff