Function report |
Source Code:kernel\relay.c |
Create Date:2022-07-28 11:47:39 |
Last Modify:2020-03-17 19:20:22 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:subbuf_splice_actor - splice up to one subbuf's worth of data
Proto:static ssize_t subbuf_splice_actor(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags, int *nonpad_ret)
Type:ssize_t
Parameter:
Type | Parameter | Name |
---|---|---|
struct file * | in | |
loff_t * | ppos | |
struct pipe_inode_info * | pipe | |
size_t | len | |
unsigned int | flags | |
int * | nonpad_ret |
1202 | subbuf_size = sub-buffer size |
1206 | read_subbuf = read_start / subbuf_size |
1208 | nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding |
1221 | If count of sub-buffers produced == count of sub-buffers consumed Then Return 0 |
1223 | If r dynamic pipe sizing Then Return -ENOMEM |
1229 | If len > subbuf_size - read_start % subbuf_size Then len = subbuf_size - read_start % subbuf_size |
1233 | pidx = read_start / PAGE_SIZE % subbuf_pages |
1234 | poff = read_start & ~PAGE_MASK |
1235 | nr_pages = min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedint, subbuf_pages, pages[] & partial[] arrays size ) |
1237 | When umber of populated pages in map < nr_pages cycle |
1239 | cur_pos = read_start + total_len |
1241 | If Not len Then Break |
1244 | this_len = min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedlong, len, PAGE_SIZE - poff) |
1251 | If this_end >= nonpad_end Then |
1260 | poff = 0 |
1261 | pidx = (pidx + 1) % subbuf_pages |
1263 | If this_end >= nonpad_end Then |
1264 | umber of populated pages in map ++ |
1265 | Break |
1269 | ret = 0 |
1270 | If Not umber of populated pages in map Then Go to out |
1277 | If read_start + ret == nonpad_end Then ret += padding |
1280 | out : |
1281 | splice_shrink_spd( & spd) |
1282 | Return ret |
Name | Describe |
---|---|
relay_file_splice_read |
Source code conversion tool public plug-in interface | X |
---|---|
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