blob: a93d5b80f3e2f02b1c33592cbd1abc93193677a5 [file] [log] [blame]
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001/*
2 * Copyright IBM Corporation, 2007
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 */
14
15#include <linux/module.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#include "ext4_jbd2.h"
17#include "ext4_extents.h"
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050018
19/*
20 * The contiguous blocks details which can be
21 * represented by a single extent
22 */
23struct list_blocks_struct {
24 ext4_lblk_t first_block, last_block;
25 ext4_fsblk_t first_pblock, last_pblock;
26};
27
28static int finish_range(handle_t *handle, struct inode *inode,
29 struct list_blocks_struct *lb)
30
31{
32 int retval = 0, needed;
33 struct ext4_extent newext;
34 struct ext4_ext_path *path;
35 if (lb->first_pblock == 0)
36 return 0;
37
38 /* Add the extent to temp inode*/
39 newext.ee_block = cpu_to_le32(lb->first_block);
40 newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
41 ext4_ext_store_pblock(&newext, lb->first_pblock);
42 path = ext4_ext_find_extent(inode, lb->first_block, NULL);
43
44 if (IS_ERR(path)) {
45 retval = PTR_ERR(path);
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050046 path = NULL;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050047 goto err_out;
48 }
49
50 /*
51 * Calculate the credit needed to inserting this extent
52 * Since we are doing this in loop we may accumalate extra
53 * credit. But below we try to not accumalate too much
54 * of them by restarting the journal.
55 */
Mingming Caoee12b632008-08-19 22:16:05 -040056 needed = ext4_ext_calc_credits_for_single_extent(inode,
57 lb->last_block - lb->first_block + 1, path);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050058
59 /*
60 * Make sure the credit we accumalated is not really high
61 */
Frank Mayhar03901312009-01-07 00:06:22 -050062 if (needed && ext4_handle_has_enough_credits(handle,
63 EXT4_RESERVE_TRANS_BLOCKS)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050064 retval = ext4_journal_restart(handle, needed);
65 if (retval)
66 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050067 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050068 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050069 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050070 /*
71 * IF not able to extend the journal restart the journal
72 */
73 retval = ext4_journal_restart(handle, needed);
74 if (retval)
75 goto err_out;
76 }
77 }
Mingming Cao00314622009-09-28 15:49:08 -040078 retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050079err_out:
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050080 if (path) {
81 ext4_ext_drop_refs(path);
82 kfree(path);
83 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050084 lb->first_pblock = 0;
85 return retval;
86}
87
88static int update_extent_range(handle_t *handle, struct inode *inode,
89 ext4_fsblk_t pblock, ext4_lblk_t blk_num,
90 struct list_blocks_struct *lb)
91{
92 int retval;
93 /*
94 * See if we can add on to the existing range (if it exists)
95 */
96 if (lb->first_pblock &&
97 (lb->last_pblock+1 == pblock) &&
98 (lb->last_block+1 == blk_num)) {
99 lb->last_pblock = pblock;
100 lb->last_block = blk_num;
101 return 0;
102 }
103 /*
104 * Start a new range.
105 */
106 retval = finish_range(handle, inode, lb);
107 lb->first_pblock = lb->last_pblock = pblock;
108 lb->first_block = lb->last_block = blk_num;
109
110 return retval;
111}
112
113static int update_ind_extent_range(handle_t *handle, struct inode *inode,
114 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
115 struct list_blocks_struct *lb)
116{
117 struct buffer_head *bh;
118 __le32 *i_data;
119 int i, retval = 0;
120 ext4_lblk_t blk_count = *blk_nump;
121 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
122
123 if (!pblock) {
124 /* Only update the file block number */
125 *blk_nump += max_entries;
126 return 0;
127 }
128
129 bh = sb_bread(inode->i_sb, pblock);
130 if (!bh)
131 return -EIO;
132
133 i_data = (__le32 *)bh->b_data;
134 for (i = 0; i < max_entries; i++, blk_count++) {
135 if (i_data[i]) {
136 retval = update_extent_range(handle, inode,
137 le32_to_cpu(i_data[i]),
138 blk_count, lb);
139 if (retval)
140 break;
141 }
142 }
143
144 /* Update the file block number */
145 *blk_nump = blk_count;
146 put_bh(bh);
147 return retval;
148
149}
150
151static int update_dind_extent_range(handle_t *handle, struct inode *inode,
152 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
153 struct list_blocks_struct *lb)
154{
155 struct buffer_head *bh;
156 __le32 *i_data;
157 int i, retval = 0;
158 ext4_lblk_t blk_count = *blk_nump;
159 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
160
161 if (!pblock) {
162 /* Only update the file block number */
163 *blk_nump += max_entries * max_entries;
164 return 0;
165 }
166 bh = sb_bread(inode->i_sb, pblock);
167 if (!bh)
168 return -EIO;
169
170 i_data = (__le32 *)bh->b_data;
171 for (i = 0; i < max_entries; i++) {
172 if (i_data[i]) {
173 retval = update_ind_extent_range(handle, inode,
174 le32_to_cpu(i_data[i]),
175 &blk_count, lb);
176 if (retval)
177 break;
178 } else {
179 /* Only update the file block number */
180 blk_count += max_entries;
181 }
182 }
183
184 /* Update the file block number */
185 *blk_nump = blk_count;
186 put_bh(bh);
187 return retval;
188
189}
190
191static int update_tind_extent_range(handle_t *handle, struct inode *inode,
192 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
193 struct list_blocks_struct *lb)
194{
195 struct buffer_head *bh;
196 __le32 *i_data;
197 int i, retval = 0;
198 ext4_lblk_t blk_count = *blk_nump;
199 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
200
201 if (!pblock) {
202 /* Only update the file block number */
203 *blk_nump += max_entries * max_entries * max_entries;
204 return 0;
205 }
206 bh = sb_bread(inode->i_sb, pblock);
207 if (!bh)
208 return -EIO;
209
210 i_data = (__le32 *)bh->b_data;
211 for (i = 0; i < max_entries; i++) {
212 if (i_data[i]) {
213 retval = update_dind_extent_range(handle, inode,
214 le32_to_cpu(i_data[i]),
215 &blk_count, lb);
216 if (retval)
217 break;
218 } else
219 /* Only update the file block number */
220 blk_count += max_entries * max_entries;
221 }
222 /* Update the file block number */
223 *blk_nump = blk_count;
224 put_bh(bh);
225 return retval;
226
227}
228
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500229static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
230{
231 int retval = 0, needed;
232
Frank Mayhar03901312009-01-07 00:06:22 -0500233 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500234 return 0;
235 /*
236 * We are freeing a blocks. During this we touch
237 * superblock, group descriptor and block bitmap.
238 * So allocate a credit of 3. We may update
239 * quota (user and group).
240 */
241 needed = 3 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
242
243 if (ext4_journal_extend(handle, needed) != 0)
244 retval = ext4_journal_restart(handle, needed);
245
246 return retval;
247}
248
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500249static int free_dind_blocks(handle_t *handle,
250 struct inode *inode, __le32 i_data)
251{
252 int i;
253 __le32 *tmp_idata;
254 struct buffer_head *bh;
255 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
256
257 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
258 if (!bh)
259 return -EIO;
260
261 tmp_idata = (__le32 *)bh->b_data;
262 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500263 if (tmp_idata[i]) {
264 extend_credit_for_blkdel(handle, inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500265 ext4_free_blocks(handle, inode,
Alex Tomasc9de5602008-01-29 00:19:52 -0500266 le32_to_cpu(tmp_idata[i]), 1, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500267 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500268 }
269 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500270 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500271 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500272 return 0;
273}
274
275static int free_tind_blocks(handle_t *handle,
276 struct inode *inode, __le32 i_data)
277{
278 int i, retval = 0;
279 __le32 *tmp_idata;
280 struct buffer_head *bh;
281 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
282
283 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
284 if (!bh)
285 return -EIO;
286
287 tmp_idata = (__le32 *)bh->b_data;
288 for (i = 0; i < max_entries; i++) {
289 if (tmp_idata[i]) {
290 retval = free_dind_blocks(handle,
291 inode, tmp_idata[i]);
292 if (retval) {
293 put_bh(bh);
294 return retval;
295 }
296 }
297 }
298 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500299 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500300 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500301 return 0;
302}
303
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500304static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500305{
306 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500307
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500308 /* ei->i_data[EXT4_IND_BLOCK] */
309 if (i_data[0]) {
310 extend_credit_for_blkdel(handle, inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500311 ext4_free_blocks(handle, inode,
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500312 le32_to_cpu(i_data[0]), 1, 1);
313 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500314
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500315 /* ei->i_data[EXT4_DIND_BLOCK] */
316 if (i_data[1]) {
317 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500318 if (retval)
319 return retval;
320 }
321
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500322 /* ei->i_data[EXT4_TIND_BLOCK] */
323 if (i_data[2]) {
324 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500325 if (retval)
326 return retval;
327 }
328 return 0;
329}
330
331static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400332 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500333{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500334 int retval;
335 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500336 struct ext4_inode_info *ei = EXT4_I(inode);
337 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
338
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500339 /*
340 * One credit accounted for writing the
341 * i_data field of the original inode
342 */
343 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400344 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500345 retval = ext4_journal_restart(handle, 1);
346 if (retval)
347 goto err_out;
348 }
349
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500350 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
351 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
352 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
353
354 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500355 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400356 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400357 * happened after we started the migrate. We need to
358 * fail the migrate
359 */
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400360 if (!(EXT4_I(inode)->i_state & EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400361 retval = -EAGAIN;
362 up_write(&EXT4_I(inode)->i_data_sem);
363 goto err_out;
364 } else
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400365 EXT4_I(inode)->i_state &= ~EXT4_STATE_EXT_MIGRATE;
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400366 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500367 * We have the extent map build with the tmp inode.
368 * Now copy the i_data across
369 */
370 ei->i_flags |= EXT4_EXTENTS_FL;
371 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
372
373 /*
374 * Update i_blocks with the new blocks that got
375 * allocated while adding extents for extent index
376 * blocks.
377 *
378 * While converting to extents we need not
379 * update the orignal inode i_blocks for extent blocks
380 * via quota APIs. The quota update happened via tmp_inode already.
381 */
382 spin_lock(&inode->i_lock);
383 inode->i_blocks += tmp_inode->i_blocks;
384 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500385 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500386
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500387 /*
388 * We mark the inode dirty after, because we decrement the
389 * i_blocks when freeing the indirect meta-data blocks
390 */
391 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500392 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500393
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500394err_out:
395 return retval;
396}
397
398static int free_ext_idx(handle_t *handle, struct inode *inode,
399 struct ext4_extent_idx *ix)
400{
401 int i, retval = 0;
402 ext4_fsblk_t block;
403 struct buffer_head *bh;
404 struct ext4_extent_header *eh;
405
406 block = idx_pblock(ix);
407 bh = sb_bread(inode->i_sb, block);
408 if (!bh)
409 return -EIO;
410
411 eh = (struct ext4_extent_header *)bh->b_data;
412 if (eh->eh_depth != 0) {
413 ix = EXT_FIRST_INDEX(eh);
414 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
415 retval = free_ext_idx(handle, inode, ix);
416 if (retval)
417 break;
418 }
419 }
420 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500421 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500422 ext4_free_blocks(handle, inode, block, 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500423 return retval;
424}
425
426/*
427 * Free the extent meta data blocks only
428 */
429static int free_ext_block(handle_t *handle, struct inode *inode)
430{
431 int i, retval = 0;
432 struct ext4_inode_info *ei = EXT4_I(inode);
433 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
434 struct ext4_extent_idx *ix;
435 if (eh->eh_depth == 0)
436 /*
437 * No extra blocks allocated for extent meta data
438 */
439 return 0;
440 ix = EXT_FIRST_INDEX(eh);
441 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
442 retval = free_ext_idx(handle, inode, ix);
443 if (retval)
444 return retval;
445 }
446 return retval;
447
448}
449
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400450int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500451{
452 handle_t *handle;
453 int retval = 0, i;
454 __le32 *i_data;
455 ext4_lblk_t blk_count = 0;
456 struct ext4_inode_info *ei;
457 struct inode *tmp_inode = NULL;
458 struct list_blocks_struct lb;
459 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400460 __u32 goal;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500461
Theodore Ts'o83982b62009-01-06 14:53:16 -0500462 /*
463 * If the filesystem does not support extents, or the inode
464 * already is extent-based, error out.
465 */
466 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
467 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
468 (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500469 return -EINVAL;
470
Valerie Clementb8356c42008-02-05 10:56:37 -0500471 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
472 /*
473 * don't migrate fast symlink
474 */
475 return retval;
476
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500477 handle = ext4_journal_start(inode,
478 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
479 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
480 2 * EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)
481 + 1);
482 if (IS_ERR(handle)) {
483 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500484 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500485 }
Andreas Dilger11013912009-06-13 11:45:35 -0400486 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
487 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Theodore Ts'of157a4a2009-06-13 11:09:42 -0400488 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Andreas Dilger11013912009-06-13 11:45:35 -0400489 S_IFREG, 0, goal);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500490 if (IS_ERR(tmp_inode)) {
491 retval = -ENOMEM;
492 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500493 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500494 }
495 i_size_write(tmp_inode, i_size_read(inode));
496 /*
497 * We don't want the inode to be reclaimed
498 * if we got interrupted in between. We have
499 * this tmp inode carrying reference to the
500 * data blocks of the original file. We set
501 * the i_nlink to zero at the last stage after
502 * switching the original file to extent format
503 */
504 tmp_inode->i_nlink = 1;
505
506 ext4_ext_tree_init(handle, tmp_inode);
507 ext4_orphan_add(handle, tmp_inode);
508 ext4_journal_stop(handle);
509
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500510 /*
511 * start with one credit accounted for
512 * superblock modification.
513 *
514 * For the tmp_inode we already have commited the
515 * trascation that created the inode. Later as and
516 * when we add extents we extent the journal
517 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500518 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400519 * Even though we take i_mutex we can still cause block
520 * allocation via mmap write to holes. If we have allocated
521 * new blocks we fail migrate. New block allocation will
522 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
523 * with i_data_sem held to prevent racing with block
524 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400525 */
526 down_read((&EXT4_I(inode)->i_data_sem));
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400527 EXT4_I(inode)->i_state |= EXT4_STATE_EXT_MIGRATE;
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400528 up_read((&EXT4_I(inode)->i_data_sem));
529
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500530 handle = ext4_journal_start(inode, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500531
532 ei = EXT4_I(inode);
533 i_data = ei->i_data;
534 memset(&lb, 0, sizeof(lb));
535
536 /* 32 bit block address 4 bytes */
537 max_entries = inode->i_sb->s_blocksize >> 2;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500538 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
539 if (i_data[i]) {
540 retval = update_extent_range(handle, tmp_inode,
541 le32_to_cpu(i_data[i]),
542 blk_count, &lb);
543 if (retval)
544 goto err_out;
545 }
546 }
547 if (i_data[EXT4_IND_BLOCK]) {
548 retval = update_ind_extent_range(handle, tmp_inode,
549 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
550 &blk_count, &lb);
551 if (retval)
552 goto err_out;
553 } else
554 blk_count += max_entries;
555 if (i_data[EXT4_DIND_BLOCK]) {
556 retval = update_dind_extent_range(handle, tmp_inode,
557 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
558 &blk_count, &lb);
559 if (retval)
560 goto err_out;
561 } else
562 blk_count += max_entries * max_entries;
563 if (i_data[EXT4_TIND_BLOCK]) {
564 retval = update_tind_extent_range(handle, tmp_inode,
565 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
566 &blk_count, &lb);
567 if (retval)
568 goto err_out;
569 }
570 /*
571 * Build the last extent
572 */
573 retval = finish_range(handle, tmp_inode, &lb);
574err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500575 if (retval)
576 /*
577 * Failure case delete the extent information with the
578 * tmp_inode
579 */
580 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400581 else {
582 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
583 if (retval)
584 /*
585 * if we fail to swap inode data free the extent
586 * details of the tmp inode
587 */
588 free_ext_block(handle, tmp_inode);
589 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500590
591 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
592 if (ext4_journal_extend(handle, 1) != 0)
593 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500594
595 /*
596 * Mark the tmp_inode as of size zero
597 */
598 i_size_write(tmp_inode, 0);
599
600 /*
601 * set the i_blocks count to zero
602 * so that the ext4_delete_inode does the
603 * right job
604 *
605 * We don't need to take the i_lock because
606 * the inode is not visible to user space.
607 */
608 tmp_inode->i_blocks = 0;
609
610 /* Reset the extent details */
611 ext4_ext_tree_init(handle, tmp_inode);
612
613 /*
614 * Set the i_nlink to zero so that
615 * generic_drop_inode really deletes the
616 * inode
617 */
618 tmp_inode->i_nlink = 0;
619
620 ext4_journal_stop(handle);
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400621 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500622 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500623
624 return retval;
625}