Function report |
Source Code:mm\vmalloc.c |
Create Date:2022-07-28 15:00:41 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Name:vwrite() - write vmalloc area in a safe way.*@buf: buffer for source data*@addr: vm address.*@count: number of bytes to be read.* This function checks that addr is a valid vmalloc'ed area, and* copy data from a buffer to the given addr
Proto:long vwrite(char *buf, char *addr, unsigned long count)
Type:long
Parameter:
Type | Parameter | Name |
---|---|---|
char * | buf | |
char * | addr | |
unsigned long | count |
3000 | copied = 0 |
3007 | spin_lock( & vmap_area_lock) |
3009 | If Not count Then Break |
3012 | If Not in "busy" tree Then Continue |
3015 | vm = in "busy" tree |
3017 | If addr >= vaddr + Lowlevel-APIs (not for driver use!) Then Continue |
3026 | n = vaddr + Lowlevel-APIs (not for driver use!) - addr |
3029 | If Not (flags & remap() and friends ) Then |
3030 | aligned_vwrite(buf, addr, n) |
3031 | copied++ |
3037 | finished : |
3038 | spin_unlock( & vmap_area_lock) |
3039 | If Not copied Then Return 0 |
3041 | Return buflen |
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