add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/kernel/relay.c
..
..
@@ -1,7 +1,7 @@
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1
 /*
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2
  * Public API and common code for kernel->userspace relay file support.
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  *
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- * See Documentation/filesystems/relay.txt for an overview.
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+ * See Documentation/filesystems/relay.rst for an overview.
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5
  *
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  * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
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  * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
..
..
@@ -91,7 +91,7 @@
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  *
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  *	Returns 0 if ok, negative on error
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  *
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- *	Caller should already have grabbed mmap_sem.
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+ *	Caller should already have grabbed mmap_lock.
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  */
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 static int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
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 {
..
..
@@ -997,14 +997,14 @@
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 /*
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  *	relay_file_read_avail - boolean, are there unconsumed bytes available?
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999
  */
1000
-static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
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+static int relay_file_read_avail(struct rchan_buf *buf)
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 {
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1002
 	size_t subbuf_size = buf->chan->subbuf_size;
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 	size_t n_subbufs = buf->chan->n_subbufs;
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1004
 	size_t produced = buf->subbufs_produced;
1005
-	size_t consumed = buf->subbufs_consumed;
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+	size_t consumed;
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1006
 
1007
-	relay_file_read_consume(buf, read_pos, 0);
1007
+	relay_file_read_consume(buf, 0, 0);
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1008
 
1009
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 	consumed = buf->subbufs_consumed;
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1010
 
..
..
@@ -1065,23 +1065,20 @@
1065
1065
 
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 /**
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  *	relay_file_read_start_pos - find the first available byte to read
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- *	@read_pos: file read position
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  *	@buf: relay channel buffer
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1069
  *
1071
- *	If the @read_pos is in the middle of padding, return the
1070
+ *	If the read_pos is in the middle of padding, return the
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  *	position of the first actually available byte, otherwise
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  *	return the original value.
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1073
  */
1075
-static size_t relay_file_read_start_pos(size_t read_pos,
1076
-					struct rchan_buf *buf)
1074
+static size_t relay_file_read_start_pos(struct rchan_buf *buf)
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1075
 {
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1076
 	size_t read_subbuf, padding, padding_start, padding_end;
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1077
 	size_t subbuf_size = buf->chan->subbuf_size;
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1078
 	size_t n_subbufs = buf->chan->n_subbufs;
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1079
 	size_t consumed = buf->subbufs_consumed % n_subbufs;
1080
+	size_t read_pos = consumed * subbuf_size + buf->bytes_consumed;
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1081
 
1083
-	if (!read_pos)
1084
-		read_pos = consumed * subbuf_size + buf->bytes_consumed;
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 	read_subbuf = read_pos / subbuf_size;
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 	padding = buf->padding[read_subbuf];
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 	padding_start = (read_subbuf + 1) * subbuf_size - padding;
..
..
@@ -1137,10 +1134,10 @@
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1134
 	do {
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 		void *from;
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1136
 
1140
-		if (!relay_file_read_avail(buf, *ppos))
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+		if (!relay_file_read_avail(buf))
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1138
 			break;
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1139
 
1143
-		read_start = relay_file_read_start_pos(*ppos, buf);
1140
+		read_start = relay_file_read_start_pos(buf);
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1141
 		avail = relay_file_read_subbuf_avail(read_start, buf);
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1142
 		if (!avail)
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1143
 			break;
..
..
@@ -1183,11 +1180,9 @@
1183
1180
 }
1184
1181
 
1185
1182
 static const struct pipe_buf_operations relay_pipe_buf_ops = {
1186
-	.can_merge = 0,
1187
-	.confirm = generic_pipe_buf_confirm,
1188
-	.release = relay_pipe_buf_release,
1189
-	.steal = generic_pipe_buf_steal,
1190
-	.get = generic_pipe_buf_get,
1183
+	.release	= relay_pipe_buf_release,
1184
+	.try_steal	= generic_pipe_buf_try_steal,
1185
+	.get		= generic_pipe_buf_get,
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1186
 };
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1187
 
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1188
 static void relay_page_release(struct splice_pipe_desc *spd, unsigned int i)