do_mincore

Name:Do a chunk of "sys_mincore()". We've already checked* all the arguments, we hold the mmap semaphore: we should* just return the amount of info we're asked for.

Proto:static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *vec)

Type:long

Parameter:

Type	Parameter	Name
unsigned long	addr
unsigned long	pages
unsigned char *	vec

213

vma = Look up the first VMA which satisfies addr < vm_end, NULL if none.

214

If Not vma || addr < Our start address within vm_mm. Then Return -ENOMEM

216

end = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(The first byte after our end addresswithin vm_mm. , addr + (pages << PAGE_SHIFT determines the page size ))

217

If Not can_do_mincore(vma) Then

218

pages = DIV_ROUND_UP(end - addr, PAGE_SIZE)

219

memset(vec, 1, pages)

220

Return pages

222

err = walk_page_range(The address space we belong to. , addr, end, & mincore_walk_ops, vec)

223

If err < 0 Then Return err

225

Return end - addr >> PAGE_SHIFT determines the page size

**Caller**
Name	Describe
SYSCALL_DEFINE3	The mincore(2) system call

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