1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h> 2 #include <linux/ceph/ceph_debug.h>
3 3
4 #include <linux/module.h> 4 #include <linux/module.h>
5 #include <linux/sched.h> 5 #include <linux/sched.h>
6 #include <linux/slab.h> 6 #include <linux/slab.h>
7 #include <linux/file.h> 7 #include <linux/file.h>
8 #include <linux/namei.h> 8 #include <linux/namei.h>
9 #include <linux/writeback.h> 9 #include <linux/writeback.h>
10 10
11 #include <linux/ceph/libceph.h> 11 #include <linux/ceph/libceph.h>
12 12
>> 13 /*
>> 14 * build a vector of user pages
>> 15 */
>> 16 struct page **ceph_get_direct_page_vector(const void __user *data,
>> 17 int num_pages, bool write_page)
>> 18 {
>> 19 struct page **pages;
>> 20 int got = 0;
>> 21 int rc = 0;
>> 22
>> 23 pages = kmalloc_array(num_pages, sizeof(*pages), GFP_NOFS);
>> 24 if (!pages)
>> 25 return ERR_PTR(-ENOMEM);
>> 26
>> 27 while (got < num_pages) {
>> 28 rc = get_user_pages_fast(
>> 29 (unsigned long)data + ((unsigned long)got * PAGE_SIZE),
>> 30 num_pages - got, write_page, pages + got);
>> 31 if (rc < 0)
>> 32 break;
>> 33 BUG_ON(rc == 0);
>> 34 got += rc;
>> 35 }
>> 36 if (rc < 0)
>> 37 goto fail;
>> 38 return pages;
>> 39
>> 40 fail:
>> 41 ceph_put_page_vector(pages, got, false);
>> 42 return ERR_PTR(rc);
>> 43 }
>> 44 EXPORT_SYMBOL(ceph_get_direct_page_vector);
>> 45
13 void ceph_put_page_vector(struct page **pages, 46 void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
14 { 47 {
15 int i; 48 int i;
16 49
17 for (i = 0; i < num_pages; i++) { 50 for (i = 0; i < num_pages; i++) {
18 if (dirty) 51 if (dirty)
19 set_page_dirty_lock(pa 52 set_page_dirty_lock(pages[i]);
20 put_page(pages[i]); 53 put_page(pages[i]);
21 } 54 }
22 kvfree(pages); 55 kvfree(pages);
23 } 56 }
24 EXPORT_SYMBOL(ceph_put_page_vector); 57 EXPORT_SYMBOL(ceph_put_page_vector);
25 58
26 void ceph_release_page_vector(struct page **pa 59 void ceph_release_page_vector(struct page **pages, int num_pages)
27 { 60 {
28 int i; 61 int i;
29 62
30 for (i = 0; i < num_pages; i++) 63 for (i = 0; i < num_pages; i++)
31 __free_pages(pages[i], 0); 64 __free_pages(pages[i], 0);
32 kfree(pages); 65 kfree(pages);
33 } 66 }
34 EXPORT_SYMBOL(ceph_release_page_vector); 67 EXPORT_SYMBOL(ceph_release_page_vector);
35 68
36 /* 69 /*
37 * allocate a vector new pages 70 * allocate a vector new pages
38 */ 71 */
39 struct page **ceph_alloc_page_vector(int num_p 72 struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags)
40 { 73 {
41 struct page **pages; 74 struct page **pages;
42 int i; 75 int i;
43 76
44 pages = kmalloc_array(num_pages, sizeo 77 pages = kmalloc_array(num_pages, sizeof(*pages), flags);
45 if (!pages) 78 if (!pages)
46 return ERR_PTR(-ENOMEM); 79 return ERR_PTR(-ENOMEM);
47 for (i = 0; i < num_pages; i++) { 80 for (i = 0; i < num_pages; i++) {
48 pages[i] = __page_cache_alloc( 81 pages[i] = __page_cache_alloc(flags);
49 if (pages[i] == NULL) { 82 if (pages[i] == NULL) {
50 ceph_release_page_vect 83 ceph_release_page_vector(pages, i);
51 return ERR_PTR(-ENOMEM 84 return ERR_PTR(-ENOMEM);
52 } 85 }
53 } 86 }
54 return pages; 87 return pages;
55 } 88 }
56 EXPORT_SYMBOL(ceph_alloc_page_vector); 89 EXPORT_SYMBOL(ceph_alloc_page_vector);
57 90
58 /* 91 /*
59 * copy user data into a page vector 92 * copy user data into a page vector
60 */ 93 */
61 int ceph_copy_user_to_page_vector(struct page 94 int ceph_copy_user_to_page_vector(struct page **pages,
62 const 95 const void __user *data,
63 loff_ 96 loff_t off, size_t len)
64 { 97 {
65 int i = 0; 98 int i = 0;
66 int po = off & ~PAGE_MASK; 99 int po = off & ~PAGE_MASK;
67 int left = len; 100 int left = len;
68 int l, bad; 101 int l, bad;
69 102
70 while (left > 0) { 103 while (left > 0) {
71 l = min_t(int, PAGE_SIZE-po, l 104 l = min_t(int, PAGE_SIZE-po, left);
72 bad = copy_from_user(page_addr 105 bad = copy_from_user(page_address(pages[i]) + po, data, l);
73 if (bad == l) 106 if (bad == l)
74 return -EFAULT; 107 return -EFAULT;
75 data += l - bad; 108 data += l - bad;
76 left -= l - bad; 109 left -= l - bad;
77 po += l - bad; 110 po += l - bad;
78 if (po == PAGE_SIZE) { 111 if (po == PAGE_SIZE) {
79 po = 0; 112 po = 0;
80 i++; 113 i++;
81 } 114 }
82 } 115 }
83 return len; 116 return len;
84 } 117 }
85 EXPORT_SYMBOL(ceph_copy_user_to_page_vector); 118 EXPORT_SYMBOL(ceph_copy_user_to_page_vector);
86 119
87 void ceph_copy_to_page_vector(struct page **pa 120 void ceph_copy_to_page_vector(struct page **pages,
88 const void 121 const void *data,
89 loff_t off 122 loff_t off, size_t len)
90 { 123 {
91 int i = 0; 124 int i = 0;
92 size_t po = off & ~PAGE_MASK; 125 size_t po = off & ~PAGE_MASK;
93 size_t left = len; 126 size_t left = len;
94 127
95 while (left > 0) { 128 while (left > 0) {
96 size_t l = min_t(size_t, PAGE_ 129 size_t l = min_t(size_t, PAGE_SIZE-po, left);
97 130
98 memcpy(page_address(pages[i]) 131 memcpy(page_address(pages[i]) + po, data, l);
99 data += l; 132 data += l;
100 left -= l; 133 left -= l;
101 po += l; 134 po += l;
102 if (po == PAGE_SIZE) { 135 if (po == PAGE_SIZE) {
103 po = 0; 136 po = 0;
104 i++; 137 i++;
105 } 138 }
106 } 139 }
107 } 140 }
108 EXPORT_SYMBOL(ceph_copy_to_page_vector); 141 EXPORT_SYMBOL(ceph_copy_to_page_vector);
109 142
110 void ceph_copy_from_page_vector(struct page ** 143 void ceph_copy_from_page_vector(struct page **pages,
111 void *data 144 void *data,
112 loff_t off 145 loff_t off, size_t len)
113 { 146 {
114 int i = 0; 147 int i = 0;
115 size_t po = off & ~PAGE_MASK; 148 size_t po = off & ~PAGE_MASK;
116 size_t left = len; 149 size_t left = len;
117 150
118 while (left > 0) { 151 while (left > 0) {
119 size_t l = min_t(size_t, PAGE_ 152 size_t l = min_t(size_t, PAGE_SIZE-po, left);
120 153
121 memcpy(data, page_address(page 154 memcpy(data, page_address(pages[i]) + po, l);
122 data += l; 155 data += l;
123 left -= l; 156 left -= l;
124 po += l; 157 po += l;
125 if (po == PAGE_SIZE) { 158 if (po == PAGE_SIZE) {
126 po = 0; 159 po = 0;
127 i++; 160 i++;
128 } 161 }
129 } 162 }
130 } 163 }
131 EXPORT_SYMBOL(ceph_copy_from_page_vector); 164 EXPORT_SYMBOL(ceph_copy_from_page_vector);
132 165
133 /* 166 /*
134 * Zero an extent within a page vector. Offse 167 * Zero an extent within a page vector. Offset is relative to the
135 * start of the first page. 168 * start of the first page.
136 */ 169 */
137 void ceph_zero_page_vector_range(int off, int 170 void ceph_zero_page_vector_range(int off, int len, struct page **pages)
138 { 171 {
139 int i = off >> PAGE_SHIFT; 172 int i = off >> PAGE_SHIFT;
140 173
141 off &= ~PAGE_MASK; 174 off &= ~PAGE_MASK;
142 175
143 dout("zero_page_vector_page %u~%u\n", 176 dout("zero_page_vector_page %u~%u\n", off, len);
144 177
145 /* leading partial page? */ 178 /* leading partial page? */
146 if (off) { 179 if (off) {
147 int end = min((int)PAGE_SIZE, 180 int end = min((int)PAGE_SIZE, off + len);
148 dout("zeroing %d %p head from 181 dout("zeroing %d %p head from %d\n", i, pages[i],
149 (int)off); 182 (int)off);
150 zero_user_segment(pages[i], of 183 zero_user_segment(pages[i], off, end);
151 len -= (end - off); 184 len -= (end - off);
152 i++; 185 i++;
153 } 186 }
154 while (len >= PAGE_SIZE) { 187 while (len >= PAGE_SIZE) {
155 dout("zeroing %d %p len=%d\n", 188 dout("zeroing %d %p len=%d\n", i, pages[i], len);
156 zero_user_segment(pages[i], 0, 189 zero_user_segment(pages[i], 0, PAGE_SIZE);
157 len -= PAGE_SIZE; 190 len -= PAGE_SIZE;
158 i++; 191 i++;
159 } 192 }
160 /* trailing partial page? */ 193 /* trailing partial page? */
161 if (len) { 194 if (len) {
162 dout("zeroing %d %p tail to %d 195 dout("zeroing %d %p tail to %d\n", i, pages[i], (int)len);
163 zero_user_segment(pages[i], 0, 196 zero_user_segment(pages[i], 0, len);
164 } 197 }
165 } 198 }
166 EXPORT_SYMBOL(ceph_zero_page_vector_range); 199 EXPORT_SYMBOL(ceph_zero_page_vector_range);
>> 200
167 201
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