blob: 25f3a974b725d30492f8b4db74f49285ea077db3 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040017#include "ext4_jbd2.h"
18#include "ext4_extents.h"
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050019
20/*
21 * The contiguous blocks details which can be
22 * represented by a single extent
23 */
24struct list_blocks_struct {
25 ext4_lblk_t first_block, last_block;
26 ext4_fsblk_t first_pblock, last_pblock;
27};
28
29static int finish_range(handle_t *handle, struct inode *inode,
30 struct list_blocks_struct *lb)
31
32{
33 int retval = 0, needed;
34 struct ext4_extent newext;
35 struct ext4_ext_path *path;
36 if (lb->first_pblock == 0)
37 return 0;
38
39 /* Add the extent to temp inode*/
40 newext.ee_block = cpu_to_le32(lb->first_block);
41 newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
42 ext4_ext_store_pblock(&newext, lb->first_pblock);
43 path = ext4_ext_find_extent(inode, lb->first_block, NULL);
44
45 if (IS_ERR(path)) {
46 retval = PTR_ERR(path);
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050047 path = NULL;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050048 goto err_out;
49 }
50
51 /*
52 * Calculate the credit needed to inserting this extent
53 * Since we are doing this in loop we may accumalate extra
54 * credit. But below we try to not accumalate too much
55 * of them by restarting the journal.
56 */
Mingming Caoee12b632008-08-19 22:16:05 -040057 needed = ext4_ext_calc_credits_for_single_extent(inode,
58 lb->last_block - lb->first_block + 1, path);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050059
60 /*
61 * Make sure the credit we accumalated is not really high
62 */
Frank Mayhar03901312009-01-07 00:06:22 -050063 if (needed && ext4_handle_has_enough_credits(handle,
64 EXT4_RESERVE_TRANS_BLOCKS)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050065 retval = ext4_journal_restart(handle, needed);
66 if (retval)
67 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050068 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050069 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050070 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050071 /*
72 * IF not able to extend the journal restart the journal
73 */
74 retval = ext4_journal_restart(handle, needed);
75 if (retval)
76 goto err_out;
77 }
78 }
Mingming Cao00314622009-09-28 15:49:08 -040079 retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050080err_out:
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050081 if (path) {
82 ext4_ext_drop_refs(path);
83 kfree(path);
84 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050085 lb->first_pblock = 0;
86 return retval;
87}
88
89static int update_extent_range(handle_t *handle, struct inode *inode,
90 ext4_fsblk_t pblock, ext4_lblk_t blk_num,
91 struct list_blocks_struct *lb)
92{
93 int retval;
94 /*
95 * See if we can add on to the existing range (if it exists)
96 */
97 if (lb->first_pblock &&
98 (lb->last_pblock+1 == pblock) &&
99 (lb->last_block+1 == blk_num)) {
100 lb->last_pblock = pblock;
101 lb->last_block = blk_num;
102 return 0;
103 }
104 /*
105 * Start a new range.
106 */
107 retval = finish_range(handle, inode, lb);
108 lb->first_pblock = lb->last_pblock = pblock;
109 lb->first_block = lb->last_block = blk_num;
110
111 return retval;
112}
113
114static int update_ind_extent_range(handle_t *handle, struct inode *inode,
115 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
116 struct list_blocks_struct *lb)
117{
118 struct buffer_head *bh;
119 __le32 *i_data;
120 int i, retval = 0;
121 ext4_lblk_t blk_count = *blk_nump;
122 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
123
124 if (!pblock) {
125 /* Only update the file block number */
126 *blk_nump += max_entries;
127 return 0;
128 }
129
130 bh = sb_bread(inode->i_sb, pblock);
131 if (!bh)
132 return -EIO;
133
134 i_data = (__le32 *)bh->b_data;
135 for (i = 0; i < max_entries; i++, blk_count++) {
136 if (i_data[i]) {
137 retval = update_extent_range(handle, inode,
138 le32_to_cpu(i_data[i]),
139 blk_count, lb);
140 if (retval)
141 break;
142 }
143 }
144
145 /* Update the file block number */
146 *blk_nump = blk_count;
147 put_bh(bh);
148 return retval;
149
150}
151
152static int update_dind_extent_range(handle_t *handle, struct inode *inode,
153 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
154 struct list_blocks_struct *lb)
155{
156 struct buffer_head *bh;
157 __le32 *i_data;
158 int i, retval = 0;
159 ext4_lblk_t blk_count = *blk_nump;
160 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
161
162 if (!pblock) {
163 /* Only update the file block number */
164 *blk_nump += max_entries * max_entries;
165 return 0;
166 }
167 bh = sb_bread(inode->i_sb, pblock);
168 if (!bh)
169 return -EIO;
170
171 i_data = (__le32 *)bh->b_data;
172 for (i = 0; i < max_entries; i++) {
173 if (i_data[i]) {
174 retval = update_ind_extent_range(handle, inode,
175 le32_to_cpu(i_data[i]),
176 &blk_count, lb);
177 if (retval)
178 break;
179 } else {
180 /* Only update the file block number */
181 blk_count += max_entries;
182 }
183 }
184
185 /* Update the file block number */
186 *blk_nump = blk_count;
187 put_bh(bh);
188 return retval;
189
190}
191
192static int update_tind_extent_range(handle_t *handle, struct inode *inode,
193 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
194 struct list_blocks_struct *lb)
195{
196 struct buffer_head *bh;
197 __le32 *i_data;
198 int i, retval = 0;
199 ext4_lblk_t blk_count = *blk_nump;
200 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
201
202 if (!pblock) {
203 /* Only update the file block number */
204 *blk_nump += max_entries * max_entries * max_entries;
205 return 0;
206 }
207 bh = sb_bread(inode->i_sb, pblock);
208 if (!bh)
209 return -EIO;
210
211 i_data = (__le32 *)bh->b_data;
212 for (i = 0; i < max_entries; i++) {
213 if (i_data[i]) {
214 retval = update_dind_extent_range(handle, inode,
215 le32_to_cpu(i_data[i]),
216 &blk_count, lb);
217 if (retval)
218 break;
219 } else
220 /* Only update the file block number */
221 blk_count += max_entries * max_entries;
222 }
223 /* Update the file block number */
224 *blk_nump = blk_count;
225 put_bh(bh);
226 return retval;
227
228}
229
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500230static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
231{
232 int retval = 0, needed;
233
Frank Mayhar03901312009-01-07 00:06:22 -0500234 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500235 return 0;
236 /*
237 * We are freeing a blocks. During this we touch
238 * superblock, group descriptor and block bitmap.
239 * So allocate a credit of 3. We may update
240 * quota (user and group).
241 */
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500242 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500243
244 if (ext4_journal_extend(handle, needed) != 0)
245 retval = ext4_journal_restart(handle, needed);
246
247 return retval;
248}
249
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500250static int free_dind_blocks(handle_t *handle,
251 struct inode *inode, __le32 i_data)
252{
253 int i;
254 __le32 *tmp_idata;
255 struct buffer_head *bh;
256 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
257
258 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
259 if (!bh)
260 return -EIO;
261
262 tmp_idata = (__le32 *)bh->b_data;
263 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500264 if (tmp_idata[i]) {
265 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500266 ext4_free_blocks(handle, inode, 0,
267 le32_to_cpu(tmp_idata[i]), 1,
268 EXT4_FREE_BLOCKS_METADATA |
269 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500270 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500271 }
272 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500273 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500274 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
275 EXT4_FREE_BLOCKS_METADATA |
276 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500277 return 0;
278}
279
280static int free_tind_blocks(handle_t *handle,
281 struct inode *inode, __le32 i_data)
282{
283 int i, retval = 0;
284 __le32 *tmp_idata;
285 struct buffer_head *bh;
286 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
287
288 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
289 if (!bh)
290 return -EIO;
291
292 tmp_idata = (__le32 *)bh->b_data;
293 for (i = 0; i < max_entries; i++) {
294 if (tmp_idata[i]) {
295 retval = free_dind_blocks(handle,
296 inode, tmp_idata[i]);
297 if (retval) {
298 put_bh(bh);
299 return retval;
300 }
301 }
302 }
303 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500304 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500305 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
306 EXT4_FREE_BLOCKS_METADATA |
307 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500308 return 0;
309}
310
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500311static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500312{
313 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500314
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500315 /* ei->i_data[EXT4_IND_BLOCK] */
316 if (i_data[0]) {
317 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500318 ext4_free_blocks(handle, inode, 0,
319 le32_to_cpu(i_data[0]), 1,
320 EXT4_FREE_BLOCKS_METADATA |
321 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500322 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500323
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500324 /* ei->i_data[EXT4_DIND_BLOCK] */
325 if (i_data[1]) {
326 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500327 if (retval)
328 return retval;
329 }
330
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500331 /* ei->i_data[EXT4_TIND_BLOCK] */
332 if (i_data[2]) {
333 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500334 if (retval)
335 return retval;
336 }
337 return 0;
338}
339
340static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400341 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500342{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500343 int retval;
344 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500345 struct ext4_inode_info *ei = EXT4_I(inode);
346 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
347
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500348 /*
349 * One credit accounted for writing the
350 * i_data field of the original inode
351 */
352 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400353 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500354 retval = ext4_journal_restart(handle, 1);
355 if (retval)
356 goto err_out;
357 }
358
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500359 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
360 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
361 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
362
363 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500364 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400365 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400366 * happened after we started the migrate. We need to
367 * fail the migrate
368 */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500369 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400370 retval = -EAGAIN;
371 up_write(&EXT4_I(inode)->i_data_sem);
372 goto err_out;
373 } else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500374 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400375 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500376 * We have the extent map build with the tmp inode.
377 * Now copy the i_data across
378 */
Theodore Ts'o07a03822010-06-14 09:54:48 -0400379 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500380 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
381
382 /*
383 * Update i_blocks with the new blocks that got
384 * allocated while adding extents for extent index
385 * blocks.
386 *
387 * While converting to extents we need not
388 * update the orignal inode i_blocks for extent blocks
389 * via quota APIs. The quota update happened via tmp_inode already.
390 */
391 spin_lock(&inode->i_lock);
392 inode->i_blocks += tmp_inode->i_blocks;
393 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500394 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500395
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500396 /*
397 * We mark the inode dirty after, because we decrement the
398 * i_blocks when freeing the indirect meta-data blocks
399 */
400 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500401 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500402
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500403err_out:
404 return retval;
405}
406
407static int free_ext_idx(handle_t *handle, struct inode *inode,
408 struct ext4_extent_idx *ix)
409{
410 int i, retval = 0;
411 ext4_fsblk_t block;
412 struct buffer_head *bh;
413 struct ext4_extent_header *eh;
414
Theodore Ts'obf89d162010-10-27 21:30:14 -0400415 block = ext4_idx_pblock(ix);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500416 bh = sb_bread(inode->i_sb, block);
417 if (!bh)
418 return -EIO;
419
420 eh = (struct ext4_extent_header *)bh->b_data;
421 if (eh->eh_depth != 0) {
422 ix = EXT_FIRST_INDEX(eh);
423 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
424 retval = free_ext_idx(handle, inode, ix);
425 if (retval)
426 break;
427 }
428 }
429 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500430 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500431 ext4_free_blocks(handle, inode, 0, block, 1,
432 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500433 return retval;
434}
435
436/*
437 * Free the extent meta data blocks only
438 */
439static int free_ext_block(handle_t *handle, struct inode *inode)
440{
441 int i, retval = 0;
442 struct ext4_inode_info *ei = EXT4_I(inode);
443 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
444 struct ext4_extent_idx *ix;
445 if (eh->eh_depth == 0)
446 /*
447 * No extra blocks allocated for extent meta data
448 */
449 return 0;
450 ix = EXT_FIRST_INDEX(eh);
451 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
452 retval = free_ext_idx(handle, inode, ix);
453 if (retval)
454 return retval;
455 }
456 return retval;
457
458}
459
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400460int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500461{
462 handle_t *handle;
463 int retval = 0, i;
464 __le32 *i_data;
465 ext4_lblk_t blk_count = 0;
466 struct ext4_inode_info *ei;
467 struct inode *tmp_inode = NULL;
468 struct list_blocks_struct lb;
469 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400470 __u32 goal;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500471
Theodore Ts'o83982b62009-01-06 14:53:16 -0500472 /*
473 * If the filesystem does not support extents, or the inode
474 * already is extent-based, error out.
475 */
476 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
477 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400478 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500479 return -EINVAL;
480
Valerie Clementb8356c42008-02-05 10:56:37 -0500481 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
482 /*
483 * don't migrate fast symlink
484 */
485 return retval;
486
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500487 handle = ext4_journal_start(inode,
488 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
489 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500490 EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500491 + 1);
492 if (IS_ERR(handle)) {
493 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500494 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500495 }
Andreas Dilger11013912009-06-13 11:45:35 -0400496 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
497 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Theodore Ts'of157a4a2009-06-13 11:09:42 -0400498 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Andreas Dilger11013912009-06-13 11:45:35 -0400499 S_IFREG, 0, goal);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500500 if (IS_ERR(tmp_inode)) {
501 retval = -ENOMEM;
502 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500503 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500504 }
505 i_size_write(tmp_inode, i_size_read(inode));
506 /*
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500507 * Set the i_nlink to zero so it will be deleted later
508 * when we drop inode reference.
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500509 */
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500510 tmp_inode->i_nlink = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500511
512 ext4_ext_tree_init(handle, tmp_inode);
513 ext4_orphan_add(handle, tmp_inode);
514 ext4_journal_stop(handle);
515
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500516 /*
517 * start with one credit accounted for
518 * superblock modification.
519 *
520 * For the tmp_inode we already have commited the
521 * trascation that created the inode. Later as and
522 * when we add extents we extent the journal
523 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500524 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400525 * Even though we take i_mutex we can still cause block
526 * allocation via mmap write to holes. If we have allocated
527 * new blocks we fail migrate. New block allocation will
528 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
529 * with i_data_sem held to prevent racing with block
530 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400531 */
532 down_read((&EXT4_I(inode)->i_data_sem));
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500533 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400534 up_read((&EXT4_I(inode)->i_data_sem));
535
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500536 handle = ext4_journal_start(inode, 1);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500537 if (IS_ERR(handle)) {
538 /*
539 * It is impossible to update on-disk structures without
540 * a handle, so just rollback in-core changes and live other
541 * work to orphan_list_cleanup()
542 */
543 ext4_orphan_del(NULL, tmp_inode);
544 retval = PTR_ERR(handle);
545 goto out;
546 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500547
548 ei = EXT4_I(inode);
549 i_data = ei->i_data;
550 memset(&lb, 0, sizeof(lb));
551
552 /* 32 bit block address 4 bytes */
553 max_entries = inode->i_sb->s_blocksize >> 2;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500554 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
555 if (i_data[i]) {
556 retval = update_extent_range(handle, tmp_inode,
557 le32_to_cpu(i_data[i]),
558 blk_count, &lb);
559 if (retval)
560 goto err_out;
561 }
562 }
563 if (i_data[EXT4_IND_BLOCK]) {
564 retval = update_ind_extent_range(handle, tmp_inode,
565 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
566 &blk_count, &lb);
567 if (retval)
568 goto err_out;
569 } else
570 blk_count += max_entries;
571 if (i_data[EXT4_DIND_BLOCK]) {
572 retval = update_dind_extent_range(handle, tmp_inode,
573 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
574 &blk_count, &lb);
575 if (retval)
576 goto err_out;
577 } else
578 blk_count += max_entries * max_entries;
579 if (i_data[EXT4_TIND_BLOCK]) {
580 retval = update_tind_extent_range(handle, tmp_inode,
581 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
582 &blk_count, &lb);
583 if (retval)
584 goto err_out;
585 }
586 /*
587 * Build the last extent
588 */
589 retval = finish_range(handle, tmp_inode, &lb);
590err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500591 if (retval)
592 /*
593 * Failure case delete the extent information with the
594 * tmp_inode
595 */
596 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400597 else {
598 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
599 if (retval)
600 /*
601 * if we fail to swap inode data free the extent
602 * details of the tmp inode
603 */
604 free_ext_block(handle, tmp_inode);
605 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500606
607 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
608 if (ext4_journal_extend(handle, 1) != 0)
609 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500610
611 /*
612 * Mark the tmp_inode as of size zero
613 */
614 i_size_write(tmp_inode, 0);
615
616 /*
617 * set the i_blocks count to zero
618 * so that the ext4_delete_inode does the
619 * right job
620 *
621 * We don't need to take the i_lock because
622 * the inode is not visible to user space.
623 */
624 tmp_inode->i_blocks = 0;
625
626 /* Reset the extent details */
627 ext4_ext_tree_init(handle, tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500628 ext4_journal_stop(handle);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500629out:
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400630 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500631 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500632
633 return retval;
634}