mmap.c (440fdb53b4ae58602711b5b8c3a139ace2404dbb) mmap.c (34b4e4aa3c470ce8fa2bd78abb1741b4b58baad7)
1/*
2 * mm/mmap.c
3 *
4 * Written by obz.
5 *
6 * Address space accounting code <alan@redhat.com>
7 */
8

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88 * Strict overcommit modes added 2002 Feb 26 by Alan Cox.
89 * Additional code 2002 Jul 20 by Robert Love.
90 *
91 * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise.
92 *
93 * Note this is a helper function intended to be used by LSMs which
94 * wish to use this logic.
95 */
1/*
2 * mm/mmap.c
3 *
4 * Written by obz.
5 *
6 * Address space accounting code <alan@redhat.com>
7 */
8

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88 * Strict overcommit modes added 2002 Feb 26 by Alan Cox.
89 * Additional code 2002 Jul 20 by Robert Love.
90 *
91 * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise.
92 *
93 * Note this is a helper function intended to be used by LSMs which
94 * wish to use this logic.
95 */
96int __vm_enough_memory(long pages, int cap_sys_admin)
96int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
97{
98 unsigned long free, allowed;
99
100 vm_acct_memory(pages);
101
102 /*
103 * Sometimes we want to use more memory than we have
104 */

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161 * Leave the last 3% for root
162 */
163 if (!cap_sys_admin)
164 allowed -= allowed / 32;
165 allowed += total_swap_pages;
166
167 /* Don't let a single process grow too big:
168 leave 3% of the size of this process for other processes */
97{
98 unsigned long free, allowed;
99
100 vm_acct_memory(pages);
101
102 /*
103 * Sometimes we want to use more memory than we have
104 */

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161 * Leave the last 3% for root
162 */
163 if (!cap_sys_admin)
164 allowed -= allowed / 32;
165 allowed += total_swap_pages;
166
167 /* Don't let a single process grow too big:
168 leave 3% of the size of this process for other processes */
169 allowed -= current->mm->total_vm / 32;
169 allowed -= mm->total_vm / 32;
170
171 /*
172 * cast `allowed' as a signed long because vm_committed_space
173 * sometimes has a negative value
174 */
175 if (atomic_read(&vm_committed_space) < (long)allowed)
176 return 0;
177error:

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2072 if (!vma->vm_file) {
2073 BUG_ON(vma->anon_vma);
2074 vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
2075 }
2076 __vma = find_vma_prepare(mm,vma->vm_start,&prev,&rb_link,&rb_parent);
2077 if (__vma && __vma->vm_start < vma->vm_end)
2078 return -ENOMEM;
2079 if ((vma->vm_flags & VM_ACCOUNT) &&
170
171 /*
172 * cast `allowed' as a signed long because vm_committed_space
173 * sometimes has a negative value
174 */
175 if (atomic_read(&vm_committed_space) < (long)allowed)
176 return 0;
177error:

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2072 if (!vma->vm_file) {
2073 BUG_ON(vma->anon_vma);
2074 vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
2075 }
2076 __vma = find_vma_prepare(mm,vma->vm_start,&prev,&rb_link,&rb_parent);
2077 if (__vma && __vma->vm_start < vma->vm_end)
2078 return -ENOMEM;
2079 if ((vma->vm_flags & VM_ACCOUNT) &&
2080 security_vm_enough_memory(vma_pages(vma)))
2080 security_vm_enough_memory_mm(mm, vma_pages(vma)))
2081 return -ENOMEM;
2082 vma_link(mm, vma, prev, rb_link, rb_parent);
2083 return 0;
2084}
2085
2086/*
2087 * Copy the vma structure to a new location in the same mm,
2088 * prior to moving page table entries, to effect an mremap move.

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2082 vma_link(mm, vma, prev, rb_link, rb_parent);
2083 return 0;
2084}
2085
2086/*
2087 * Copy the vma structure to a new location in the same mm,
2088 * prior to moving page table entries, to effect an mremap move.

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