vma.h (14611508cb5bf031f85bae58704c9218681d8e07) vma.h (c4d91e225ff3c9821c85ac6efd8e02c0025c0190)
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * vma.h
4 *
5 * Core VMA manipulation API implemented in vma.c.
6 */
7#ifndef __MM_VMA_H
8#define __MM_VMA_H

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54
55enum vma_merge_state {
56 VMA_MERGE_START,
57 VMA_MERGE_ERROR_NOMEM,
58 VMA_MERGE_NOMERGE,
59 VMA_MERGE_SUCCESS,
60};
61
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * vma.h
4 *
5 * Core VMA manipulation API implemented in vma.c.
6 */
7#ifndef __MM_VMA_H
8#define __MM_VMA_H

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54
55enum vma_merge_state {
56 VMA_MERGE_START,
57 VMA_MERGE_ERROR_NOMEM,
58 VMA_MERGE_NOMERGE,
59 VMA_MERGE_SUCCESS,
60};
61
62enum vma_merge_flags {
63 VMG_FLAG_DEFAULT = 0,
64 /*
65 * If we can expand, simply do so. We know there is nothing to merge to
66 * the right. Does not reset state upon failure to merge. The VMA
67 * iterator is assumed to be positioned at the previous VMA, rather than
68 * at the gap.
69 */
70 VMG_FLAG_JUST_EXPAND = 1 << 0,
71};
72
62/* Represents a VMA merge operation. */
63struct vma_merge_struct {
64 struct mm_struct *mm;
65 struct vma_iterator *vmi;
66 pgoff_t pgoff;
67 struct vm_area_struct *prev;
68 struct vm_area_struct *next; /* Modified by vma_merge(). */
69 struct vm_area_struct *vma; /* Either a new VMA or the one being modified. */
70 unsigned long start;
71 unsigned long end;
72 unsigned long flags;
73 struct file *file;
74 struct anon_vma *anon_vma;
75 struct mempolicy *policy;
76 struct vm_userfaultfd_ctx uffd_ctx;
77 struct anon_vma_name *anon_name;
73/* Represents a VMA merge operation. */
74struct vma_merge_struct {
75 struct mm_struct *mm;
76 struct vma_iterator *vmi;
77 pgoff_t pgoff;
78 struct vm_area_struct *prev;
79 struct vm_area_struct *next; /* Modified by vma_merge(). */
80 struct vm_area_struct *vma; /* Either a new VMA or the one being modified. */
81 unsigned long start;
82 unsigned long end;
83 unsigned long flags;
84 struct file *file;
85 struct anon_vma *anon_vma;
86 struct mempolicy *policy;
87 struct vm_userfaultfd_ctx uffd_ctx;
88 struct anon_vma_name *anon_name;
89 enum vma_merge_flags merge_flags;
78 enum vma_merge_state state;
79};
80
81static inline bool vmg_nomem(struct vma_merge_struct *vmg)
82{
83 return vmg->state == VMA_MERGE_ERROR_NOMEM;
84}
85

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94 struct vma_merge_struct name = { \
95 .mm = mm_, \
96 .vmi = vmi_, \
97 .start = start_, \
98 .end = end_, \
99 .flags = flags_, \
100 .pgoff = pgoff_, \
101 .state = VMA_MERGE_START, \
90 enum vma_merge_state state;
91};
92
93static inline bool vmg_nomem(struct vma_merge_struct *vmg)
94{
95 return vmg->state == VMA_MERGE_ERROR_NOMEM;
96}
97

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106 struct vma_merge_struct name = { \
107 .mm = mm_, \
108 .vmi = vmi_, \
109 .start = start_, \
110 .end = end_, \
111 .flags = flags_, \
112 .pgoff = pgoff_, \
113 .state = VMA_MERGE_START, \
114 .merge_flags = VMG_FLAG_DEFAULT, \
102 }
103
104#define VMG_VMA_STATE(name, vmi_, prev_, vma_, start_, end_) \
105 struct vma_merge_struct name = { \
106 .mm = vma_->vm_mm, \
107 .vmi = vmi_, \
108 .prev = prev_, \
109 .next = NULL, \
110 .vma = vma_, \
111 .start = start_, \
112 .end = end_, \
113 .flags = vma_->vm_flags, \
114 .pgoff = vma_pgoff_offset(vma_, start_), \
115 .file = vma_->vm_file, \
116 .anon_vma = vma_->anon_vma, \
117 .policy = vma_policy(vma_), \
118 .uffd_ctx = vma_->vm_userfaultfd_ctx, \
119 .anon_name = anon_vma_name(vma_), \
120 .state = VMA_MERGE_START, \
115 }
116
117#define VMG_VMA_STATE(name, vmi_, prev_, vma_, start_, end_) \
118 struct vma_merge_struct name = { \
119 .mm = vma_->vm_mm, \
120 .vmi = vmi_, \
121 .prev = prev_, \
122 .next = NULL, \
123 .vma = vma_, \
124 .start = start_, \
125 .end = end_, \
126 .flags = vma_->vm_flags, \
127 .pgoff = vma_pgoff_offset(vma_, start_), \
128 .file = vma_->vm_file, \
129 .anon_vma = vma_->anon_vma, \
130 .policy = vma_policy(vma_), \
131 .uffd_ctx = vma_->vm_userfaultfd_ctx, \
132 .anon_name = anon_vma_name(vma_), \
133 .state = VMA_MERGE_START, \
134 .merge_flags = VMG_FLAG_DEFAULT, \
121 }
122
123#ifdef CONFIG_DEBUG_VM_MAPLE_TREE
124void validate_mm(struct mm_struct *mm);
125#else
126#define validate_mm(mm) do { } while (0)
127#endif
128

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136
137#ifdef CONFIG_DEBUG_VM_MAPLE_TREE
138void validate_mm(struct mm_struct *mm);
139#else
140#define validate_mm(mm) do { } while (0)
141#endif
142

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