bitmap.c (e5451c8f8330e03ad3cfa16048b4daf961af434f) bitmap.c (09cbfeaf1a5a67bfb3201e0c83c810cecb2efa5a)
1/*
2 * bitmap.c - NTFS kernel bitmap handling. Part of the Linux-NTFS project.
3 *
4 * Copyright (c) 2004-2005 Anton Altaparmakov
5 *
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or

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62 is_rollback ? " (rollback)" : "");
63 BUG_ON(start_bit < 0);
64 BUG_ON(cnt < 0);
65 BUG_ON(value > 1);
66 /*
67 * Calculate the indices for the pages containing the first and last
68 * bits, i.e. @start_bit and @start_bit + @cnt - 1, respectively.
69 */
1/*
2 * bitmap.c - NTFS kernel bitmap handling. Part of the Linux-NTFS project.
3 *
4 * Copyright (c) 2004-2005 Anton Altaparmakov
5 *
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or

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62 is_rollback ? " (rollback)" : "");
63 BUG_ON(start_bit < 0);
64 BUG_ON(cnt < 0);
65 BUG_ON(value > 1);
66 /*
67 * Calculate the indices for the pages containing the first and last
68 * bits, i.e. @start_bit and @start_bit + @cnt - 1, respectively.
69 */
70 index = start_bit >> (3 + PAGE_CACHE_SHIFT);
71 end_index = (start_bit + cnt - 1) >> (3 + PAGE_CACHE_SHIFT);
70 index = start_bit >> (3 + PAGE_SHIFT);
71 end_index = (start_bit + cnt - 1) >> (3 + PAGE_SHIFT);
72
73 /* Get the page containing the first bit (@start_bit). */
74 mapping = vi->i_mapping;
75 page = ntfs_map_page(mapping, index);
76 if (IS_ERR(page)) {
77 if (!is_rollback)
78 ntfs_error(vi->i_sb, "Failed to map first page (error "
79 "%li), aborting.", PTR_ERR(page));
80 return PTR_ERR(page);
81 }
82 kaddr = page_address(page);
83
84 /* Set @pos to the position of the byte containing @start_bit. */
72
73 /* Get the page containing the first bit (@start_bit). */
74 mapping = vi->i_mapping;
75 page = ntfs_map_page(mapping, index);
76 if (IS_ERR(page)) {
77 if (!is_rollback)
78 ntfs_error(vi->i_sb, "Failed to map first page (error "
79 "%li), aborting.", PTR_ERR(page));
80 return PTR_ERR(page);
81 }
82 kaddr = page_address(page);
83
84 /* Set @pos to the position of the byte containing @start_bit. */
85 pos = (start_bit >> 3) & ~PAGE_CACHE_MASK;
85 pos = (start_bit >> 3) & ~PAGE_MASK;
86
87 /* Calculate the position of @start_bit in the first byte. */
88 bit = start_bit & 7;
89
90 /* If the first byte is partial, modify the appropriate bits in it. */
91 if (bit) {
92 u8 *byte = kaddr + pos;
93 while ((bit & 7) && cnt) {

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103
104 /* Update @pos to the new position. */
105 pos++;
106 }
107 /*
108 * Depending on @value, modify all remaining whole bytes in the page up
109 * to @cnt.
110 */
86
87 /* Calculate the position of @start_bit in the first byte. */
88 bit = start_bit & 7;
89
90 /* If the first byte is partial, modify the appropriate bits in it. */
91 if (bit) {
92 u8 *byte = kaddr + pos;
93 while ((bit & 7) && cnt) {

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103
104 /* Update @pos to the new position. */
105 pos++;
106 }
107 /*
108 * Depending on @value, modify all remaining whole bytes in the page up
109 * to @cnt.
110 */
111 len = min_t(s64, cnt >> 3, PAGE_CACHE_SIZE - pos);
111 len = min_t(s64, cnt >> 3, PAGE_SIZE - pos);
112 memset(kaddr + pos, value ? 0xff : 0, len);
113 cnt -= len << 3;
114
115 /* Update @len to point to the first not-done byte in the page. */
116 if (cnt < 8)
117 len += pos;
118
119 /* If we are not in the last page, deal with all subsequent pages. */

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127 page = ntfs_map_page(mapping, ++index);
128 if (IS_ERR(page))
129 goto rollback;
130 kaddr = page_address(page);
131 /*
132 * Depending on @value, modify all remaining whole bytes in the
133 * page up to @cnt.
134 */
112 memset(kaddr + pos, value ? 0xff : 0, len);
113 cnt -= len << 3;
114
115 /* Update @len to point to the first not-done byte in the page. */
116 if (cnt < 8)
117 len += pos;
118
119 /* If we are not in the last page, deal with all subsequent pages. */

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127 page = ntfs_map_page(mapping, ++index);
128 if (IS_ERR(page))
129 goto rollback;
130 kaddr = page_address(page);
131 /*
132 * Depending on @value, modify all remaining whole bytes in the
133 * page up to @cnt.
134 */
135 len = min_t(s64, cnt >> 3, PAGE_CACHE_SIZE);
135 len = min_t(s64, cnt >> 3, PAGE_SIZE);
136 memset(kaddr, value ? 0xff : 0, len);
137 cnt -= len << 3;
138 }
139 /*
140 * The currently mapped page is the last one. If the last byte is
141 * partial, modify the appropriate bits in it. Note, @len is the
142 * position of the last byte inside the page.
143 */

--- 50 unchanged lines hidden --- 		136 memset(kaddr, value ? 0xff : 0, len);
137 cnt -= len << 3;
138 }
139 /*
140 * The currently mapped page is the last one. If the last byte is
141 * partial, modify the appropriate bits in it. Note, @len is the
142 * position of the last byte inside the page.
143 */

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