Function report |
Source Code:kernel\bpf\syscall.c |
Create Date:2022-07-28 12:52:54 |
Last Modify:2022-05-19 18:06:12 | Copyright©Brick |
home page | Tree |
Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:map_freeze
Proto:static int map_freeze(const union bpf_attr *attr)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
const union bpf_attr * | attr |
1247 | err = 0 , ufd = anonymous struct used by BPF_MAP_*_ELEM commands |
1251 | If helper macro to check that unused fields 'union bpf_attr' are zero (BPF_MAP_FREEZE) Then Return -EINVAL |
1255 | map = error is returned, fd is released.* On success caller should complete fd access with matching fdput() |
1259 | mutex_lock( & freeze_mutex) |
1261 | If writable mmap cnt; protected by freeze_mutex Then |
1265 | If READ_ONCE( write-once; write-protected by freeze_mutex ) Then |
1269 | If Not Check operation authority Then |
1274 | WRITE_ONCE( write-once; write-protected by freeze_mutex , true) |
1275 | err_put : |
1278 | Return err |
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