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-rw-r--r--kernel/relay.c36
1 files changed, 22 insertions, 14 deletions
diff --git a/kernel/relay.c b/kernel/relay.c
index 85786ff2a4f9..1d63ecddfa70 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -95,7 +95,7 @@ int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
95 * @buf: the buffer struct 95 * @buf: the buffer struct
96 * @size: total size of the buffer 96 * @size: total size of the buffer
97 * 97 *
98 * Returns a pointer to the resulting buffer, NULL if unsuccessful. The 98 * Returns a pointer to the resulting buffer, %NULL if unsuccessful. The
99 * passed in size will get page aligned, if it isn't already. 99 * passed in size will get page aligned, if it isn't already.
100 */ 100 */
101static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size) 101static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
@@ -132,10 +132,9 @@ depopulate:
132 132
133/** 133/**
134 * relay_create_buf - allocate and initialize a channel buffer 134 * relay_create_buf - allocate and initialize a channel buffer
135 * @alloc_size: size of the buffer to allocate 135 * @chan: the relay channel
136 * @n_subbufs: number of sub-buffers in the channel
137 * 136 *
138 * Returns channel buffer if successful, NULL otherwise 137 * Returns channel buffer if successful, %NULL otherwise.
139 */ 138 */
140struct rchan_buf *relay_create_buf(struct rchan *chan) 139struct rchan_buf *relay_create_buf(struct rchan *chan)
141{ 140{
@@ -163,6 +162,7 @@ free_buf:
163 162
164/** 163/**
165 * relay_destroy_channel - free the channel struct 164 * relay_destroy_channel - free the channel struct
165 * @kref: target kernel reference that contains the relay channel
166 * 166 *
167 * Should only be called from kref_put(). 167 * Should only be called from kref_put().
168 */ 168 */
@@ -194,6 +194,7 @@ void relay_destroy_buf(struct rchan_buf *buf)
194 194
195/** 195/**
196 * relay_remove_buf - remove a channel buffer 196 * relay_remove_buf - remove a channel buffer
197 * @kref: target kernel reference that contains the relay buffer
197 * 198 *
198 * Removes the file from the fileystem, which also frees the 199 * Removes the file from the fileystem, which also frees the
199 * rchan_buf_struct and the channel buffer. Should only be called from 200 * rchan_buf_struct and the channel buffer. Should only be called from
@@ -374,7 +375,7 @@ void relay_reset(struct rchan *chan)
374} 375}
375EXPORT_SYMBOL_GPL(relay_reset); 376EXPORT_SYMBOL_GPL(relay_reset);
376 377
377/** 378/*
378 * relay_open_buf - create a new relay channel buffer 379 * relay_open_buf - create a new relay channel buffer
379 * 380 *
380 * Internal - used by relay_open(). 381 * Internal - used by relay_open().
@@ -448,12 +449,12 @@ static inline void setup_callbacks(struct rchan *chan,
448/** 449/**
449 * relay_open - create a new relay channel 450 * relay_open - create a new relay channel
450 * @base_filename: base name of files to create 451 * @base_filename: base name of files to create
451 * @parent: dentry of parent directory, NULL for root directory 452 * @parent: dentry of parent directory, %NULL for root directory
452 * @subbuf_size: size of sub-buffers 453 * @subbuf_size: size of sub-buffers
453 * @n_subbufs: number of sub-buffers 454 * @n_subbufs: number of sub-buffers
454 * @cb: client callback functions 455 * @cb: client callback functions
455 * 456 *
456 * Returns channel pointer if successful, NULL otherwise. 457 * Returns channel pointer if successful, %NULL otherwise.
457 * 458 *
458 * Creates a channel buffer for each cpu using the sizes and 459 * Creates a channel buffer for each cpu using the sizes and
459 * attributes specified. The created channel buffer files 460 * attributes specified. The created channel buffer files
@@ -585,7 +586,7 @@ EXPORT_SYMBOL_GPL(relay_switch_subbuf);
585 * subbufs_consumed should be the number of sub-buffers newly consumed, 586 * subbufs_consumed should be the number of sub-buffers newly consumed,
586 * not the total consumed. 587 * not the total consumed.
587 * 588 *
588 * NOTE: kernel clients don't need to call this function if the channel 589 * NOTE: Kernel clients don't need to call this function if the channel
589 * mode is 'overwrite'. 590 * mode is 'overwrite'.
590 */ 591 */
591void relay_subbufs_consumed(struct rchan *chan, 592void relay_subbufs_consumed(struct rchan *chan,
@@ -641,7 +642,7 @@ EXPORT_SYMBOL_GPL(relay_close);
641 * relay_flush - close the channel 642 * relay_flush - close the channel
642 * @chan: the channel 643 * @chan: the channel
643 * 644 *
644 * Flushes all channel buffers i.e. forces buffer switch. 645 * Flushes all channel buffers, i.e. forces buffer switch.
645 */ 646 */
646void relay_flush(struct rchan *chan) 647void relay_flush(struct rchan *chan)
647{ 648{
@@ -729,7 +730,7 @@ static int relay_file_release(struct inode *inode, struct file *filp)
729 return 0; 730 return 0;
730} 731}
731 732
732/** 733/*
733 * relay_file_read_consume - update the consumed count for the buffer 734 * relay_file_read_consume - update the consumed count for the buffer
734 */ 735 */
735static void relay_file_read_consume(struct rchan_buf *buf, 736static void relay_file_read_consume(struct rchan_buf *buf,
@@ -756,7 +757,7 @@ static void relay_file_read_consume(struct rchan_buf *buf,
756 } 757 }
757} 758}
758 759
759/** 760/*
760 * relay_file_read_avail - boolean, are there unconsumed bytes available? 761 * relay_file_read_avail - boolean, are there unconsumed bytes available?
761 */ 762 */
762static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos) 763static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
@@ -793,6 +794,8 @@ static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
793 794
794/** 795/**
795 * relay_file_read_subbuf_avail - return bytes available in sub-buffer 796 * relay_file_read_subbuf_avail - return bytes available in sub-buffer
797 * @read_pos: file read position
798 * @buf: relay channel buffer
796 */ 799 */
797static size_t relay_file_read_subbuf_avail(size_t read_pos, 800static size_t relay_file_read_subbuf_avail(size_t read_pos,
798 struct rchan_buf *buf) 801 struct rchan_buf *buf)
@@ -818,6 +821,8 @@ static size_t relay_file_read_subbuf_avail(size_t read_pos,
818 821
819/** 822/**
820 * relay_file_read_start_pos - find the first available byte to read 823 * relay_file_read_start_pos - find the first available byte to read
824 * @read_pos: file read position
825 * @buf: relay channel buffer
821 * 826 *
822 * If the read_pos is in the middle of padding, return the 827 * If the read_pos is in the middle of padding, return the
823 * position of the first actually available byte, otherwise 828 * position of the first actually available byte, otherwise
@@ -844,6 +849,9 @@ static size_t relay_file_read_start_pos(size_t read_pos,
844 849
845/** 850/**
846 * relay_file_read_end_pos - return the new read position 851 * relay_file_read_end_pos - return the new read position
852 * @read_pos: file read position
853 * @buf: relay channel buffer
854 * @count: number of bytes to be read
847 */ 855 */
848static size_t relay_file_read_end_pos(struct rchan_buf *buf, 856static size_t relay_file_read_end_pos(struct rchan_buf *buf,
849 size_t read_pos, 857 size_t read_pos,
@@ -865,7 +873,7 @@ static size_t relay_file_read_end_pos(struct rchan_buf *buf,
865 return end_pos; 873 return end_pos;
866} 874}
867 875
868/** 876/*
869 * subbuf_read_actor - read up to one subbuf's worth of data 877 * subbuf_read_actor - read up to one subbuf's worth of data
870 */ 878 */
871static int subbuf_read_actor(size_t read_start, 879static int subbuf_read_actor(size_t read_start,
@@ -890,7 +898,7 @@ static int subbuf_read_actor(size_t read_start,
890 return ret; 898 return ret;
891} 899}
892 900
893/** 901/*
894 * subbuf_send_actor - send up to one subbuf's worth of data 902 * subbuf_send_actor - send up to one subbuf's worth of data
895 */ 903 */
896static int subbuf_send_actor(size_t read_start, 904static int subbuf_send_actor(size_t read_start,
@@ -933,7 +941,7 @@ typedef int (*subbuf_actor_t) (size_t read_start,
933 read_descriptor_t *desc, 941 read_descriptor_t *desc,
934 read_actor_t actor); 942 read_actor_t actor);
935 943
936/** 944/*
937 * relay_file_read_subbufs - read count bytes, bridging subbuf boundaries 945 * relay_file_read_subbufs - read count bytes, bridging subbuf boundaries
938 */ 946 */
939static inline ssize_t relay_file_read_subbufs(struct file *filp, 947static inline ssize_t relay_file_read_subbufs(struct file *filp,