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22#include "udfdecl.h"
23#include <linux/fs.h>
24#include <linux/mm.h>
25#include <linux/buffer_head.h>
26
27#include "udf_i.h"
28#include "udf_sb.h"
29
30static void extent_trunc(struct inode *inode, struct extent_position *epos,
31 struct kernel_lb_addr *eloc, int8_t etype, uint32_t elen,
32 uint32_t nelen)
33{
34 struct kernel_lb_addr neloc = {};
35 int last_block = (elen + inode->i_sb->s_blocksize - 1) >>
36 inode->i_sb->s_blocksize_bits;
37 int first_block = (nelen + inode->i_sb->s_blocksize - 1) >>
38 inode->i_sb->s_blocksize_bits;
39
40 if (nelen) {
41 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
42 udf_free_blocks(inode->i_sb, inode, eloc, 0,
43 last_block);
44 etype = (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30);
45 } else
46 neloc = *eloc;
47 nelen = (etype << 30) | nelen;
48 }
49
50 if (elen != nelen) {
51 udf_write_aext(inode, epos, &neloc, nelen, 0);
52 if (last_block - first_block > 0) {
53 if (etype == (EXT_RECORDED_ALLOCATED >> 30))
54 mark_inode_dirty(inode);
55
56 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
57 udf_free_blocks(inode->i_sb, inode, eloc,
58 first_block,
59 last_block - first_block);
60 }
61 }
62}
63
64
65
66
67
68void udf_truncate_tail_extent(struct inode *inode)
69{
70 struct extent_position epos = {};
71 struct kernel_lb_addr eloc;
72 uint32_t elen, nelen;
73 uint64_t lbcount = 0;
74 int8_t etype = -1, netype;
75 int adsize;
76 struct udf_inode_info *iinfo = UDF_I(inode);
77
78 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
79 inode->i_size == iinfo->i_lenExtents)
80 return;
81
82 if (inode->i_nlink == 0)
83 return;
84
85 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
86 adsize = sizeof(struct short_ad);
87 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
88 adsize = sizeof(struct long_ad);
89 else
90 BUG();
91
92
93 while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
94 etype = netype;
95 lbcount += elen;
96 if (lbcount > inode->i_size) {
97 if (lbcount - inode->i_size >= inode->i_sb->s_blocksize)
98 printk(KERN_WARNING
99 "udf_truncate_tail_extent(): Too long "
100 "extent after EOF in inode %u: i_size: "
101 "%Ld lbcount: %Ld extent %u+%u\n",
102 (unsigned)inode->i_ino,
103 (long long)inode->i_size,
104 (long long)lbcount,
105 (unsigned)eloc.logicalBlockNum,
106 (unsigned)elen);
107 nelen = elen - (lbcount - inode->i_size);
108 epos.offset -= adsize;
109 extent_trunc(inode, &epos, &eloc, etype, elen, nelen);
110 epos.offset += adsize;
111 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) != -1)
112 printk(KERN_ERR "udf_truncate_tail_extent(): "
113 "Extent after EOF in inode %u.\n",
114 (unsigned)inode->i_ino);
115 break;
116 }
117 }
118
119
120 iinfo->i_lenExtents = inode->i_size;
121 brelse(epos.bh);
122}
123
124void udf_discard_prealloc(struct inode *inode)
125{
126 struct extent_position epos = { NULL, 0, {0, 0} };
127 struct kernel_lb_addr eloc;
128 uint32_t elen;
129 uint64_t lbcount = 0;
130 int8_t etype = -1, netype;
131 int adsize;
132 struct udf_inode_info *iinfo = UDF_I(inode);
133
134 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
135 inode->i_size == iinfo->i_lenExtents)
136 return;
137
138 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
139 adsize = sizeof(struct short_ad);
140 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
141 adsize = sizeof(struct long_ad);
142 else
143 adsize = 0;
144
145 epos.block = iinfo->i_location;
146
147
148 while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
149 etype = netype;
150 lbcount += elen;
151 }
152 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
153 epos.offset -= adsize;
154 lbcount -= elen;
155 extent_trunc(inode, &epos, &eloc, etype, elen, 0);
156 if (!epos.bh) {
157 iinfo->i_lenAlloc =
158 epos.offset -
159 udf_file_entry_alloc_offset(inode);
160 mark_inode_dirty(inode);
161 } else {
162 struct allocExtDesc *aed =
163 (struct allocExtDesc *)(epos.bh->b_data);
164 aed->lengthAllocDescs =
165 cpu_to_le32(epos.offset -
166 sizeof(struct allocExtDesc));
167 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
168 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
169 udf_update_tag(epos.bh->b_data, epos.offset);
170 else
171 udf_update_tag(epos.bh->b_data,
172 sizeof(struct allocExtDesc));
173 mark_buffer_dirty_inode(epos.bh, inode);
174 }
175 }
176
177
178 iinfo->i_lenExtents = lbcount;
179 brelse(epos.bh);
180}
181
182static void udf_update_alloc_ext_desc(struct inode *inode,
183 struct extent_position *epos,
184 u32 lenalloc)
185{
186 struct super_block *sb = inode->i_sb;
187 struct udf_sb_info *sbi = UDF_SB(sb);
188
189 struct allocExtDesc *aed = (struct allocExtDesc *) (epos->bh->b_data);
190 int len = sizeof(struct allocExtDesc);
191
192 aed->lengthAllocDescs = cpu_to_le32(lenalloc);
193 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT) || sbi->s_udfrev >= 0x0201)
194 len += lenalloc;
195
196 udf_update_tag(epos->bh->b_data, len);
197 mark_buffer_dirty_inode(epos->bh, inode);
198}
199
200void udf_truncate_extents(struct inode *inode)
201{
202 struct extent_position epos;
203 struct kernel_lb_addr eloc, neloc = {};
204 uint32_t elen, nelen = 0, indirect_ext_len = 0, lenalloc;
205 int8_t etype;
206 struct super_block *sb = inode->i_sb;
207 sector_t first_block = inode->i_size >> sb->s_blocksize_bits, offset;
208 loff_t byte_offset;
209 int adsize;
210 struct udf_inode_info *iinfo = UDF_I(inode);
211
212 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
213 adsize = sizeof(struct short_ad);
214 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
215 adsize = sizeof(struct long_ad);
216 else
217 BUG();
218
219 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
220 byte_offset = (offset << sb->s_blocksize_bits) +
221 (inode->i_size & (sb->s_blocksize - 1));
222 if (etype != -1) {
223 epos.offset -= adsize;
224 extent_trunc(inode, &epos, &eloc, etype, elen, byte_offset);
225 epos.offset += adsize;
226 if (byte_offset)
227 lenalloc = epos.offset;
228 else
229 lenalloc = epos.offset - adsize;
230
231 if (!epos.bh)
232 lenalloc -= udf_file_entry_alloc_offset(inode);
233 else
234 lenalloc -= sizeof(struct allocExtDesc);
235
236 while ((etype = udf_current_aext(inode, &epos, &eloc,
237 &elen, 0)) != -1) {
238 if (etype == (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
239 udf_write_aext(inode, &epos, &neloc, nelen, 0);
240 if (indirect_ext_len) {
241
242
243 BUG_ON(!epos.bh);
244 udf_free_blocks(sb, inode, &epos.block,
245 0, indirect_ext_len);
246 } else if (!epos.bh) {
247 iinfo->i_lenAlloc = lenalloc;
248 mark_inode_dirty(inode);
249 } else
250 udf_update_alloc_ext_desc(inode,
251 &epos, lenalloc);
252 brelse(epos.bh);
253 epos.offset = sizeof(struct allocExtDesc);
254 epos.block = eloc;
255 epos.bh = udf_tread(sb,
256 udf_get_lb_pblock(sb, &eloc, 0));
257 if (elen)
258 indirect_ext_len =
259 (elen + sb->s_blocksize - 1) >>
260 sb->s_blocksize_bits;
261 else
262 indirect_ext_len = 1;
263 } else {
264 extent_trunc(inode, &epos, &eloc, etype,
265 elen, 0);
266 epos.offset += adsize;
267 }
268 }
269
270 if (indirect_ext_len) {
271 BUG_ON(!epos.bh);
272 udf_free_blocks(sb, inode, &epos.block, 0,
273 indirect_ext_len);
274 } else if (!epos.bh) {
275 iinfo->i_lenAlloc = lenalloc;
276 mark_inode_dirty(inode);
277 } else
278 udf_update_alloc_ext_desc(inode, &epos, lenalloc);
279 } else if (inode->i_size) {
280 if (byte_offset) {
281 struct kernel_long_ad extent;
282
283
284
285
286
287
288 if ((!epos.bh &&
289 epos.offset ==
290 udf_file_entry_alloc_offset(inode)) ||
291 (epos.bh && epos.offset ==
292 sizeof(struct allocExtDesc))) {
293
294
295 extent.extLocation.logicalBlockNum = 0;
296 extent.extLocation.partitionReferenceNum = 0;
297 extent.extLength =
298 EXT_NOT_RECORDED_NOT_ALLOCATED;
299 } else {
300 epos.offset -= adsize;
301 etype = udf_next_aext(inode, &epos,
302 &extent.extLocation,
303 &extent.extLength, 0);
304 extent.extLength |= etype << 30;
305 }
306 udf_extend_file(inode, &epos, &extent,
307 offset +
308 ((inode->i_size &
309 (sb->s_blocksize - 1)) != 0));
310 }
311 }
312 iinfo->i_lenExtents = inode->i_size;
313
314 brelse(epos.bh);
315}
316
