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1da177e4 LT |
1 | /* |
2 | * truncate.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Truncate handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
7 | * CONTACTS | |
8 | * E-mail regarding any portion of the Linux UDF file system should be | |
9 | * directed to the development team mailing list (run by majordomo): | |
10 | * linux_udf@hpesjro.fc.hp.com | |
11 | * | |
12 | * COPYRIGHT | |
13 | * This file is distributed under the terms of the GNU General Public | |
14 | * License (GPL). Copies of the GPL can be obtained from: | |
15 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
16 | * Each contributing author retains all rights to their own work. | |
17 | * | |
18 | * (C) 1999-2004 Ben Fennema | |
19 | * (C) 1999 Stelias Computing Inc | |
20 | * | |
21 | * HISTORY | |
22 | * | |
23 | * 02/24/99 blf Created. | |
24 | * | |
25 | */ | |
26 | ||
27 | #include "udfdecl.h" | |
28 | #include <linux/fs.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/udf_fs.h> | |
31 | #include <linux/buffer_head.h> | |
32 | ||
33 | #include "udf_i.h" | |
34 | #include "udf_sb.h" | |
35 | ||
36 | static void extent_trunc(struct inode * inode, kernel_lb_addr bloc, int extoffset, | |
37 | kernel_lb_addr eloc, int8_t etype, uint32_t elen, struct buffer_head *bh, uint32_t nelen) | |
38 | { | |
39 | kernel_lb_addr neloc = { 0, 0 }; | |
40 | int last_block = (elen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits; | |
41 | int first_block = (nelen + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits; | |
42 | ||
43 | if (nelen) | |
44 | { | |
45 | if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) | |
46 | { | |
47 | udf_free_blocks(inode->i_sb, inode, eloc, 0, last_block); | |
48 | etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30); | |
49 | } | |
50 | else | |
51 | neloc = eloc; | |
52 | nelen = (etype << 30) | nelen; | |
53 | } | |
54 | ||
55 | if (elen != nelen) | |
56 | { | |
57 | udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0); | |
58 | if (last_block - first_block > 0) | |
59 | { | |
60 | if (etype == (EXT_RECORDED_ALLOCATED >> 30)) | |
61 | mark_inode_dirty(inode); | |
62 | ||
63 | if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) | |
64 | udf_free_blocks(inode->i_sb, inode, eloc, first_block, last_block - first_block); | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | void udf_discard_prealloc(struct inode * inode) | |
70 | { | |
71 | kernel_lb_addr bloc, eloc; | |
72 | uint32_t extoffset = 0, elen, nelen; | |
73 | uint64_t lbcount = 0; | |
74 | int8_t etype = -1, netype; | |
75 | struct buffer_head *bh = NULL; | |
76 | int adsize; | |
77 | ||
78 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB || | |
79 | inode->i_size == UDF_I_LENEXTENTS(inode)) | |
80 | { | |
81 | return; | |
82 | } | |
83 | ||
84 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT) | |
85 | adsize = sizeof(short_ad); | |
86 | else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG) | |
87 | adsize = sizeof(long_ad); | |
88 | else | |
89 | adsize = 0; | |
90 | ||
91 | bloc = UDF_I_LOCATION(inode); | |
92 | ||
93 | while ((netype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1) | |
94 | { | |
95 | etype = netype; | |
96 | lbcount += elen; | |
97 | if (lbcount > inode->i_size && lbcount - inode->i_size < inode->i_sb->s_blocksize) | |
98 | { | |
99 | nelen = elen - (lbcount - inode->i_size); | |
100 | extent_trunc(inode, bloc, extoffset-adsize, eloc, etype, elen, bh, nelen); | |
101 | lbcount = inode->i_size; | |
102 | } | |
103 | } | |
104 | if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) | |
105 | { | |
106 | extoffset -= adsize; | |
107 | lbcount -= elen; | |
108 | extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0); | |
109 | if (!bh) | |
110 | { | |
111 | UDF_I_LENALLOC(inode) = extoffset - udf_file_entry_alloc_offset(inode); | |
112 | mark_inode_dirty(inode); | |
113 | } | |
114 | else | |
115 | { | |
116 | struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data); | |
117 | aed->lengthAllocDescs = cpu_to_le32(extoffset - sizeof(struct allocExtDesc)); | |
118 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201) | |
119 | udf_update_tag(bh->b_data, extoffset); | |
120 | else | |
121 | udf_update_tag(bh->b_data, sizeof(struct allocExtDesc)); | |
122 | mark_buffer_dirty_inode(bh, inode); | |
123 | } | |
124 | } | |
125 | UDF_I_LENEXTENTS(inode) = lbcount; | |
126 | ||
127 | udf_release_data(bh); | |
128 | } | |
129 | ||
130 | void udf_truncate_extents(struct inode * inode) | |
131 | { | |
132 | kernel_lb_addr bloc, eloc, neloc = { 0, 0 }; | |
133 | uint32_t extoffset, elen, offset, nelen = 0, lelen = 0, lenalloc; | |
134 | int8_t etype; | |
135 | int first_block = inode->i_size >> inode->i_sb->s_blocksize_bits; | |
136 | struct buffer_head *bh = NULL; | |
137 | int adsize; | |
138 | ||
139 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT) | |
140 | adsize = sizeof(short_ad); | |
141 | else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG) | |
142 | adsize = sizeof(long_ad); | |
143 | else | |
144 | adsize = 0; | |
145 | ||
146 | etype = inode_bmap(inode, first_block, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
147 | offset += (inode->i_size & (inode->i_sb->s_blocksize - 1)); | |
148 | if (etype != -1) | |
149 | { | |
150 | extoffset -= adsize; | |
151 | extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, offset); | |
152 | extoffset += adsize; | |
153 | ||
154 | if (offset) | |
155 | lenalloc = extoffset; | |
156 | else | |
157 | lenalloc = extoffset - adsize; | |
158 | ||
159 | if (!bh) | |
160 | lenalloc -= udf_file_entry_alloc_offset(inode); | |
161 | else | |
162 | lenalloc -= sizeof(struct allocExtDesc); | |
163 | ||
164 | while ((etype = udf_current_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 0)) != -1) | |
165 | { | |
166 | if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) | |
167 | { | |
168 | udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 0); | |
169 | extoffset = 0; | |
170 | if (lelen) | |
171 | { | |
172 | if (!bh) | |
173 | BUG(); | |
174 | else | |
175 | memset(bh->b_data, 0x00, sizeof(struct allocExtDesc)); | |
176 | udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen); | |
177 | } | |
178 | else | |
179 | { | |
180 | if (!bh) | |
181 | { | |
182 | UDF_I_LENALLOC(inode) = lenalloc; | |
183 | mark_inode_dirty(inode); | |
184 | } | |
185 | else | |
186 | { | |
187 | struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data); | |
188 | aed->lengthAllocDescs = cpu_to_le32(lenalloc); | |
189 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201) | |
190 | udf_update_tag(bh->b_data, lenalloc + | |
191 | sizeof(struct allocExtDesc)); | |
192 | else | |
193 | udf_update_tag(bh->b_data, sizeof(struct allocExtDesc)); | |
194 | mark_buffer_dirty_inode(bh, inode); | |
195 | } | |
196 | } | |
197 | ||
198 | udf_release_data(bh); | |
199 | extoffset = sizeof(struct allocExtDesc); | |
200 | bloc = eloc; | |
201 | bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, bloc, 0)); | |
202 | if (elen) | |
203 | lelen = (elen + inode->i_sb->s_blocksize - 1) >> | |
204 | inode->i_sb->s_blocksize_bits; | |
205 | else | |
206 | lelen = 1; | |
207 | } | |
208 | else | |
209 | { | |
210 | extent_trunc(inode, bloc, extoffset, eloc, etype, elen, bh, 0); | |
211 | extoffset += adsize; | |
212 | } | |
213 | } | |
214 | ||
215 | if (lelen) | |
216 | { | |
217 | if (!bh) | |
218 | BUG(); | |
219 | else | |
220 | memset(bh->b_data, 0x00, sizeof(struct allocExtDesc)); | |
221 | udf_free_blocks(inode->i_sb, inode, bloc, 0, lelen); | |
222 | } | |
223 | else | |
224 | { | |
225 | if (!bh) | |
226 | { | |
227 | UDF_I_LENALLOC(inode) = lenalloc; | |
228 | mark_inode_dirty(inode); | |
229 | } | |
230 | else | |
231 | { | |
232 | struct allocExtDesc *aed = (struct allocExtDesc *)(bh->b_data); | |
233 | aed->lengthAllocDescs = cpu_to_le32(lenalloc); | |
234 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201) | |
235 | udf_update_tag(bh->b_data, lenalloc + | |
236 | sizeof(struct allocExtDesc)); | |
237 | else | |
238 | udf_update_tag(bh->b_data, sizeof(struct allocExtDesc)); | |
239 | mark_buffer_dirty_inode(bh, inode); | |
240 | } | |
241 | } | |
242 | } | |
243 | else if (inode->i_size) | |
244 | { | |
245 | if (offset) | |
246 | { | |
247 | extoffset -= adsize; | |
248 | etype = udf_next_aext(inode, &bloc, &extoffset, &eloc, &elen, &bh, 1); | |
249 | if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) | |
250 | { | |
251 | extoffset -= adsize; | |
252 | elen = EXT_NOT_RECORDED_NOT_ALLOCATED | (elen + offset); | |
253 | udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 0); | |
254 | } | |
255 | else if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) | |
256 | { | |
257 | kernel_lb_addr neloc = { 0, 0 }; | |
258 | extoffset -= adsize; | |
259 | nelen = EXT_NOT_RECORDED_NOT_ALLOCATED | | |
260 | ((elen + offset + inode->i_sb->s_blocksize - 1) & | |
261 | ~(inode->i_sb->s_blocksize - 1)); | |
262 | udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 1); | |
263 | udf_add_aext(inode, &bloc, &extoffset, eloc, (etype << 30) | elen, &bh, 1); | |
264 | } | |
265 | else | |
266 | { | |
267 | if (elen & (inode->i_sb->s_blocksize - 1)) | |
268 | { | |
269 | extoffset -= adsize; | |
270 | elen = EXT_RECORDED_ALLOCATED | | |
271 | ((elen + inode->i_sb->s_blocksize - 1) & | |
272 | ~(inode->i_sb->s_blocksize - 1)); | |
273 | udf_write_aext(inode, bloc, &extoffset, eloc, elen, bh, 1); | |
274 | } | |
275 | memset(&eloc, 0x00, sizeof(kernel_lb_addr)); | |
276 | elen = EXT_NOT_RECORDED_NOT_ALLOCATED | offset; | |
277 | udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 1); | |
278 | } | |
279 | } | |
280 | } | |
281 | UDF_I_LENEXTENTS(inode) = inode->i_size; | |
282 | ||
283 | udf_release_data(bh); | |
284 | } |