blob: d129a4dc16a713834b81ff7d6bb330cbbf8be1ce [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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#include "ext4_jbd2.h"
Theodore Ts'o4a092d72012-11-28 13:03:30 -050017#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 */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040023struct migrate_struct {
24 ext4_lblk_t first_block, last_block, curr_block;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050025 ext4_fsblk_t first_pblock, last_pblock;
26};
27
28static int finish_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040029 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050030
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,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040089 ext4_fsblk_t pblock, struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050090{
91 int retval;
92 /*
93 * See if we can add on to the existing range (if it exists)
94 */
95 if (lb->first_pblock &&
96 (lb->last_pblock+1 == pblock) &&
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040097 (lb->last_block+1 == lb->curr_block)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050098 lb->last_pblock = pblock;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040099 lb->last_block = lb->curr_block;
100 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500101 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;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400108 lb->first_block = lb->last_block = lb->curr_block;
109 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500110 return retval;
111}
112
113static int update_ind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400114 ext4_fsblk_t pblock,
115 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500116{
117 struct buffer_head *bh;
118 __le32 *i_data;
119 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500120 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
121
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500122 bh = sb_bread(inode->i_sb, pblock);
123 if (!bh)
124 return -EIO;
125
126 i_data = (__le32 *)bh->b_data;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400127 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500128 if (i_data[i]) {
129 retval = update_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400130 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500131 if (retval)
132 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400133 } else {
134 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500135 }
136 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500137 put_bh(bh);
138 return retval;
139
140}
141
142static int update_dind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400143 ext4_fsblk_t pblock,
144 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500145{
146 struct buffer_head *bh;
147 __le32 *i_data;
148 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500149 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
150
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500151 bh = sb_bread(inode->i_sb, pblock);
152 if (!bh)
153 return -EIO;
154
155 i_data = (__le32 *)bh->b_data;
156 for (i = 0; i < max_entries; i++) {
157 if (i_data[i]) {
158 retval = update_ind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400159 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500160 if (retval)
161 break;
162 } else {
163 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400164 lb->curr_block += max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500165 }
166 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500167 put_bh(bh);
168 return retval;
169
170}
171
172static int update_tind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400173 ext4_fsblk_t pblock,
174 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500175{
176 struct buffer_head *bh;
177 __le32 *i_data;
178 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500179 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
180
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500181 bh = sb_bread(inode->i_sb, pblock);
182 if (!bh)
183 return -EIO;
184
185 i_data = (__le32 *)bh->b_data;
186 for (i = 0; i < max_entries; i++) {
187 if (i_data[i]) {
188 retval = update_dind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400189 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500190 if (retval)
191 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400192 } else {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500193 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400194 lb->curr_block += max_entries * max_entries;
195 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500196 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500197 put_bh(bh);
198 return retval;
199
200}
201
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500202static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
203{
204 int retval = 0, needed;
205
Frank Mayhar03901312009-01-07 00:06:22 -0500206 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500207 return 0;
208 /*
209 * We are freeing a blocks. During this we touch
210 * superblock, group descriptor and block bitmap.
211 * So allocate a credit of 3. We may update
212 * quota (user and group).
213 */
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500214 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500215
216 if (ext4_journal_extend(handle, needed) != 0)
217 retval = ext4_journal_restart(handle, needed);
218
219 return retval;
220}
221
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500222static int free_dind_blocks(handle_t *handle,
223 struct inode *inode, __le32 i_data)
224{
225 int i;
226 __le32 *tmp_idata;
227 struct buffer_head *bh;
228 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
229
230 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
231 if (!bh)
232 return -EIO;
233
234 tmp_idata = (__le32 *)bh->b_data;
235 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500236 if (tmp_idata[i]) {
237 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500238 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500239 le32_to_cpu(tmp_idata[i]), 1,
240 EXT4_FREE_BLOCKS_METADATA |
241 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500242 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500243 }
244 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500245 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500246 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500247 EXT4_FREE_BLOCKS_METADATA |
248 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500249 return 0;
250}
251
252static int free_tind_blocks(handle_t *handle,
253 struct inode *inode, __le32 i_data)
254{
255 int i, retval = 0;
256 __le32 *tmp_idata;
257 struct buffer_head *bh;
258 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
259
260 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
261 if (!bh)
262 return -EIO;
263
264 tmp_idata = (__le32 *)bh->b_data;
265 for (i = 0; i < max_entries; i++) {
266 if (tmp_idata[i]) {
267 retval = free_dind_blocks(handle,
268 inode, tmp_idata[i]);
269 if (retval) {
270 put_bh(bh);
271 return retval;
272 }
273 }
274 }
275 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500276 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500277 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500278 EXT4_FREE_BLOCKS_METADATA |
279 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500280 return 0;
281}
282
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500283static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500284{
285 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500286
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500287 /* ei->i_data[EXT4_IND_BLOCK] */
288 if (i_data[0]) {
289 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500290 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500291 le32_to_cpu(i_data[0]), 1,
292 EXT4_FREE_BLOCKS_METADATA |
293 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500294 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500295
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500296 /* ei->i_data[EXT4_DIND_BLOCK] */
297 if (i_data[1]) {
298 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500299 if (retval)
300 return retval;
301 }
302
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500303 /* ei->i_data[EXT4_TIND_BLOCK] */
304 if (i_data[2]) {
305 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500306 if (retval)
307 return retval;
308 }
309 return 0;
310}
311
312static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400313 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500314{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500315 int retval;
316 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500317 struct ext4_inode_info *ei = EXT4_I(inode);
318 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
319
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500320 /*
321 * One credit accounted for writing the
322 * i_data field of the original inode
323 */
324 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400325 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500326 retval = ext4_journal_restart(handle, 1);
327 if (retval)
328 goto err_out;
329 }
330
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500331 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
332 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
333 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
334
335 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500336 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400337 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400338 * happened after we started the migrate. We need to
339 * fail the migrate
340 */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500341 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400342 retval = -EAGAIN;
343 up_write(&EXT4_I(inode)->i_data_sem);
344 goto err_out;
345 } else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500346 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400347 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500348 * We have the extent map build with the tmp inode.
349 * Now copy the i_data across
350 */
Theodore Ts'o74e4e6d2011-05-03 09:34:42 -0400351 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500352 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
353
354 /*
355 * Update i_blocks with the new blocks that got
356 * allocated while adding extents for extent index
357 * blocks.
358 *
359 * While converting to extents we need not
360 * update the orignal inode i_blocks for extent blocks
361 * via quota APIs. The quota update happened via tmp_inode already.
362 */
363 spin_lock(&inode->i_lock);
364 inode->i_blocks += tmp_inode->i_blocks;
365 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500366 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500367
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500368 /*
369 * We mark the inode dirty after, because we decrement the
370 * i_blocks when freeing the indirect meta-data blocks
371 */
372 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500373 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500374
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500375err_out:
376 return retval;
377}
378
379static int free_ext_idx(handle_t *handle, struct inode *inode,
380 struct ext4_extent_idx *ix)
381{
382 int i, retval = 0;
383 ext4_fsblk_t block;
384 struct buffer_head *bh;
385 struct ext4_extent_header *eh;
386
Theodore Ts'obf89d162010-10-27 21:30:14 -0400387 block = ext4_idx_pblock(ix);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500388 bh = sb_bread(inode->i_sb, block);
389 if (!bh)
390 return -EIO;
391
392 eh = (struct ext4_extent_header *)bh->b_data;
393 if (eh->eh_depth != 0) {
394 ix = EXT_FIRST_INDEX(eh);
395 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
396 retval = free_ext_idx(handle, inode, ix);
397 if (retval)
398 break;
399 }
400 }
401 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500402 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500403 ext4_free_blocks(handle, inode, NULL, block, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500404 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500405 return retval;
406}
407
408/*
409 * Free the extent meta data blocks only
410 */
411static int free_ext_block(handle_t *handle, struct inode *inode)
412{
413 int i, retval = 0;
414 struct ext4_inode_info *ei = EXT4_I(inode);
415 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
416 struct ext4_extent_idx *ix;
417 if (eh->eh_depth == 0)
418 /*
419 * No extra blocks allocated for extent meta data
420 */
421 return 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 return retval;
427 }
428 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500429}
430
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400431int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500432{
433 handle_t *handle;
434 int retval = 0, i;
435 __le32 *i_data;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500436 struct ext4_inode_info *ei;
437 struct inode *tmp_inode = NULL;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400438 struct migrate_struct lb;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500439 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400440 __u32 goal;
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400441 uid_t owner[2];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500442
Theodore Ts'o83982b62009-01-06 14:53:16 -0500443 /*
444 * If the filesystem does not support extents, or the inode
445 * already is extent-based, error out.
446 */
447 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
448 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400449 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500450 return -EINVAL;
451
Valerie Clementb8356c42008-02-05 10:56:37 -0500452 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
453 /*
454 * don't migrate fast symlink
455 */
456 return retval;
457
Theodore Ts'o4b217632013-02-09 12:50:27 -0500458 /*
459 * Worst case we can touch the allocation bitmaps, a bgd
460 * block, and a block to link in the orphan list. We do need
461 * need to worry about credits for modifying the quota inode.
462 */
Theodore Ts'o9924a922013-02-08 21:59:22 -0500463 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
Theodore Ts'o4b217632013-02-09 12:50:27 -0500464 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
465
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500466 if (IS_ERR(handle)) {
467 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500468 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500469 }
Andreas Dilger11013912009-06-13 11:45:35 -0400470 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
471 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Eric W. Biederman08cefc72012-02-07 15:41:49 -0800472 owner[0] = i_uid_read(inode);
473 owner[1] = i_gid_read(inode);
Theodore Ts'of157a4a2009-06-13 11:09:42 -0400474 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400475 S_IFREG, NULL, goal, owner);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500476 if (IS_ERR(tmp_inode)) {
Dan Carpentera0cc9102012-02-20 17:53:06 -0500477 retval = PTR_ERR(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500478 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500479 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500480 }
481 i_size_write(tmp_inode, i_size_read(inode));
482 /*
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500483 * Set the i_nlink to zero so it will be deleted later
484 * when we drop inode reference.
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500485 */
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200486 clear_nlink(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500487
488 ext4_ext_tree_init(handle, tmp_inode);
489 ext4_orphan_add(handle, tmp_inode);
490 ext4_journal_stop(handle);
491
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500492 /*
493 * start with one credit accounted for
494 * superblock modification.
495 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300496 * For the tmp_inode we already have committed the
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500497 * trascation that created the inode. Later as and
498 * when we add extents we extent the journal
499 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500500 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400501 * Even though we take i_mutex we can still cause block
502 * allocation via mmap write to holes. If we have allocated
503 * new blocks we fail migrate. New block allocation will
504 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
505 * with i_data_sem held to prevent racing with block
506 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400507 */
508 down_read((&EXT4_I(inode)->i_data_sem));
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500509 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400510 up_read((&EXT4_I(inode)->i_data_sem));
511
Theodore Ts'o9924a922013-02-08 21:59:22 -0500512 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500513 if (IS_ERR(handle)) {
514 /*
515 * It is impossible to update on-disk structures without
516 * a handle, so just rollback in-core changes and live other
517 * work to orphan_list_cleanup()
518 */
519 ext4_orphan_del(NULL, tmp_inode);
520 retval = PTR_ERR(handle);
521 goto out;
522 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500523
524 ei = EXT4_I(inode);
525 i_data = ei->i_data;
526 memset(&lb, 0, sizeof(lb));
527
528 /* 32 bit block address 4 bytes */
529 max_entries = inode->i_sb->s_blocksize >> 2;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400530 for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500531 if (i_data[i]) {
532 retval = update_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400533 le32_to_cpu(i_data[i]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500534 if (retval)
535 goto err_out;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400536 } else
537 lb.curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500538 }
539 if (i_data[EXT4_IND_BLOCK]) {
540 retval = update_ind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400541 le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500542 if (retval)
543 goto err_out;
544 } else
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400545 lb.curr_block += max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500546 if (i_data[EXT4_DIND_BLOCK]) {
547 retval = update_dind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400548 le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500549 if (retval)
550 goto err_out;
551 } else
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400552 lb.curr_block += max_entries * max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500553 if (i_data[EXT4_TIND_BLOCK]) {
554 retval = update_tind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400555 le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500556 if (retval)
557 goto err_out;
558 }
559 /*
560 * Build the last extent
561 */
562 retval = finish_range(handle, tmp_inode, &lb);
563err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500564 if (retval)
565 /*
566 * Failure case delete the extent information with the
567 * tmp_inode
568 */
569 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400570 else {
571 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
572 if (retval)
573 /*
574 * if we fail to swap inode data free the extent
575 * details of the tmp inode
576 */
577 free_ext_block(handle, tmp_inode);
578 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500579
580 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
581 if (ext4_journal_extend(handle, 1) != 0)
582 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500583
584 /*
585 * Mark the tmp_inode as of size zero
586 */
587 i_size_write(tmp_inode, 0);
588
589 /*
590 * set the i_blocks count to zero
591 * so that the ext4_delete_inode does the
592 * right job
593 *
594 * We don't need to take the i_lock because
595 * the inode is not visible to user space.
596 */
597 tmp_inode->i_blocks = 0;
598
599 /* Reset the extent details */
600 ext4_ext_tree_init(handle, tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500601 ext4_journal_stop(handle);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500602out:
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400603 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500604 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500605
606 return retval;
607}
Lukas Czerner0d14b092013-04-10 23:32:52 -0400608
609/*
610 * Migrate a simple extent-based inode to use the i_blocks[] array
611 */
612int ext4_ind_migrate(struct inode *inode)
613{
614 struct ext4_extent_header *eh;
615 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
616 struct ext4_inode_info *ei = EXT4_I(inode);
617 struct ext4_extent *ex;
618 unsigned int i, len;
619 ext4_fsblk_t blk;
620 handle_t *handle;
621 int ret;
622
623 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
624 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
625 (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
626 return -EINVAL;
627
628 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
629 if (IS_ERR(handle))
630 return PTR_ERR(handle);
631
632 down_write(&EXT4_I(inode)->i_data_sem);
633 ret = ext4_ext_check_inode(inode);
634 if (ret)
635 goto errout;
636
637 eh = ext_inode_hdr(inode);
638 ex = EXT_FIRST_EXTENT(eh);
639 if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
640 eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
641 ret = -EOPNOTSUPP;
642 goto errout;
643 }
644 if (eh->eh_entries == 0)
645 blk = len = 0;
646 else {
647 len = le16_to_cpu(ex->ee_len);
648 blk = ext4_ext_pblock(ex);
649 if (len > EXT4_NDIR_BLOCKS) {
650 ret = -EOPNOTSUPP;
651 goto errout;
652 }
653 }
654
655 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
656 memset(ei->i_data, 0, sizeof(ei->i_data));
657 for (i=0; i < len; i++)
658 ei->i_data[i] = cpu_to_le32(blk++);
659 ext4_mark_inode_dirty(handle, inode);
660errout:
661 ext4_journal_stop(handle);
662 up_write(&EXT4_I(inode)->i_data_sem);
663 return ret;
664}