blob: d3567f27bae7071931bcc4b06470caf69d123d7b [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);
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040042 /* Locking only for convinience since we are operating on temp inode */
43 down_write(&EXT4_I(inode)->i_data_sem);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -040044 path = ext4_ext_find_extent(inode, lb->first_block, NULL, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050045
46 if (IS_ERR(path)) {
47 retval = PTR_ERR(path);
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050048 path = NULL;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050049 goto err_out;
50 }
51
52 /*
53 * Calculate the credit needed to inserting this extent
54 * Since we are doing this in loop we may accumalate extra
55 * credit. But below we try to not accumalate too much
56 * of them by restarting the journal.
57 */
Mingming Caoee12b632008-08-19 22:16:05 -040058 needed = ext4_ext_calc_credits_for_single_extent(inode,
59 lb->last_block - lb->first_block + 1, path);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050060
61 /*
62 * Make sure the credit we accumalated is not really high
63 */
Frank Mayhar03901312009-01-07 00:06:22 -050064 if (needed && ext4_handle_has_enough_credits(handle,
65 EXT4_RESERVE_TRANS_BLOCKS)) {
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040066 up_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050067 retval = ext4_journal_restart(handle, needed);
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040068 down_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050069 if (retval)
70 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050071 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050072 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050073 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050074 /*
75 * IF not able to extend the journal restart the journal
76 */
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040077 up_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050078 retval = ext4_journal_restart(handle, needed);
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040079 down_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050080 if (retval)
81 goto err_out;
82 }
83 }
Mingming Cao00314622009-09-28 15:49:08 -040084 retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050085err_out:
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040086 up_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050087 if (path) {
88 ext4_ext_drop_refs(path);
89 kfree(path);
90 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050091 lb->first_pblock = 0;
92 return retval;
93}
94
95static int update_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040096 ext4_fsblk_t pblock, struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050097{
98 int retval;
99 /*
100 * See if we can add on to the existing range (if it exists)
101 */
102 if (lb->first_pblock &&
103 (lb->last_pblock+1 == pblock) &&
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400104 (lb->last_block+1 == lb->curr_block)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500105 lb->last_pblock = pblock;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400106 lb->last_block = lb->curr_block;
107 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500108 return 0;
109 }
110 /*
111 * Start a new range.
112 */
113 retval = finish_range(handle, inode, lb);
114 lb->first_pblock = lb->last_pblock = pblock;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400115 lb->first_block = lb->last_block = lb->curr_block;
116 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500117 return retval;
118}
119
120static int update_ind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400121 ext4_fsblk_t pblock,
122 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500123{
124 struct buffer_head *bh;
125 __le32 *i_data;
126 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500127 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
128
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500129 bh = sb_bread(inode->i_sb, pblock);
130 if (!bh)
131 return -EIO;
132
133 i_data = (__le32 *)bh->b_data;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400134 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500135 if (i_data[i]) {
136 retval = update_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400137 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500138 if (retval)
139 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400140 } else {
141 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500142 }
143 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500144 put_bh(bh);
145 return retval;
146
147}
148
149static int update_dind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400150 ext4_fsblk_t pblock,
151 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500152{
153 struct buffer_head *bh;
154 __le32 *i_data;
155 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500156 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
157
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500158 bh = sb_bread(inode->i_sb, pblock);
159 if (!bh)
160 return -EIO;
161
162 i_data = (__le32 *)bh->b_data;
163 for (i = 0; i < max_entries; i++) {
164 if (i_data[i]) {
165 retval = update_ind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400166 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500167 if (retval)
168 break;
169 } else {
170 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400171 lb->curr_block += max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500172 }
173 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500174 put_bh(bh);
175 return retval;
176
177}
178
179static int update_tind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400180 ext4_fsblk_t pblock,
181 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500182{
183 struct buffer_head *bh;
184 __le32 *i_data;
185 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500186 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
187
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500188 bh = sb_bread(inode->i_sb, pblock);
189 if (!bh)
190 return -EIO;
191
192 i_data = (__le32 *)bh->b_data;
193 for (i = 0; i < max_entries; i++) {
194 if (i_data[i]) {
195 retval = update_dind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400196 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500197 if (retval)
198 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400199 } else {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500200 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400201 lb->curr_block += max_entries * max_entries;
202 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500203 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500204 put_bh(bh);
205 return retval;
206
207}
208
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500209static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
210{
211 int retval = 0, needed;
212
Frank Mayhar03901312009-01-07 00:06:22 -0500213 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500214 return 0;
215 /*
216 * We are freeing a blocks. During this we touch
217 * superblock, group descriptor and block bitmap.
218 * So allocate a credit of 3. We may update
219 * quota (user and group).
220 */
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500221 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500222
223 if (ext4_journal_extend(handle, needed) != 0)
224 retval = ext4_journal_restart(handle, needed);
225
226 return retval;
227}
228
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500229static int free_dind_blocks(handle_t *handle,
230 struct inode *inode, __le32 i_data)
231{
232 int i;
233 __le32 *tmp_idata;
234 struct buffer_head *bh;
235 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
236
237 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
238 if (!bh)
239 return -EIO;
240
241 tmp_idata = (__le32 *)bh->b_data;
242 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500243 if (tmp_idata[i]) {
244 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500245 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500246 le32_to_cpu(tmp_idata[i]), 1,
247 EXT4_FREE_BLOCKS_METADATA |
248 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500249 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500250 }
251 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500252 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500253 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500254 EXT4_FREE_BLOCKS_METADATA |
255 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500256 return 0;
257}
258
259static int free_tind_blocks(handle_t *handle,
260 struct inode *inode, __le32 i_data)
261{
262 int i, retval = 0;
263 __le32 *tmp_idata;
264 struct buffer_head *bh;
265 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
266
267 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
268 if (!bh)
269 return -EIO;
270
271 tmp_idata = (__le32 *)bh->b_data;
272 for (i = 0; i < max_entries; i++) {
273 if (tmp_idata[i]) {
274 retval = free_dind_blocks(handle,
275 inode, tmp_idata[i]);
276 if (retval) {
277 put_bh(bh);
278 return retval;
279 }
280 }
281 }
282 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500283 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500284 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500285 EXT4_FREE_BLOCKS_METADATA |
286 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500287 return 0;
288}
289
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500290static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500291{
292 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500293
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500294 /* ei->i_data[EXT4_IND_BLOCK] */
295 if (i_data[0]) {
296 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500297 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500298 le32_to_cpu(i_data[0]), 1,
299 EXT4_FREE_BLOCKS_METADATA |
300 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500301 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500302
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500303 /* ei->i_data[EXT4_DIND_BLOCK] */
304 if (i_data[1]) {
305 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500306 if (retval)
307 return retval;
308 }
309
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500310 /* ei->i_data[EXT4_TIND_BLOCK] */
311 if (i_data[2]) {
312 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500313 if (retval)
314 return retval;
315 }
316 return 0;
317}
318
319static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400320 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500321{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500322 int retval;
323 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500324 struct ext4_inode_info *ei = EXT4_I(inode);
325 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
326
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500327 /*
328 * One credit accounted for writing the
329 * i_data field of the original inode
330 */
331 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400332 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500333 retval = ext4_journal_restart(handle, 1);
334 if (retval)
335 goto err_out;
336 }
337
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500338 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
339 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
340 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
341
342 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500343 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400344 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400345 * happened after we started the migrate. We need to
346 * fail the migrate
347 */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500348 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400349 retval = -EAGAIN;
350 up_write(&EXT4_I(inode)->i_data_sem);
351 goto err_out;
352 } else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500353 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400354 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500355 * We have the extent map build with the tmp inode.
356 * Now copy the i_data across
357 */
Theodore Ts'o74e4e6d2011-05-03 09:34:42 -0400358 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500359 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
360
361 /*
362 * Update i_blocks with the new blocks that got
363 * allocated while adding extents for extent index
364 * blocks.
365 *
366 * While converting to extents we need not
367 * update the orignal inode i_blocks for extent blocks
368 * via quota APIs. The quota update happened via tmp_inode already.
369 */
370 spin_lock(&inode->i_lock);
371 inode->i_blocks += tmp_inode->i_blocks;
372 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500373 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500374
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500375 /*
376 * We mark the inode dirty after, because we decrement the
377 * i_blocks when freeing the indirect meta-data blocks
378 */
379 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500380 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500381
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500382err_out:
383 return retval;
384}
385
386static int free_ext_idx(handle_t *handle, struct inode *inode,
387 struct ext4_extent_idx *ix)
388{
389 int i, retval = 0;
390 ext4_fsblk_t block;
391 struct buffer_head *bh;
392 struct ext4_extent_header *eh;
393
Theodore Ts'obf89d162010-10-27 21:30:14 -0400394 block = ext4_idx_pblock(ix);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500395 bh = sb_bread(inode->i_sb, block);
396 if (!bh)
397 return -EIO;
398
399 eh = (struct ext4_extent_header *)bh->b_data;
400 if (eh->eh_depth != 0) {
401 ix = EXT_FIRST_INDEX(eh);
402 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
403 retval = free_ext_idx(handle, inode, ix);
404 if (retval)
405 break;
406 }
407 }
408 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500409 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500410 ext4_free_blocks(handle, inode, NULL, block, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500411 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500412 return retval;
413}
414
415/*
416 * Free the extent meta data blocks only
417 */
418static int free_ext_block(handle_t *handle, struct inode *inode)
419{
420 int i, retval = 0;
421 struct ext4_inode_info *ei = EXT4_I(inode);
422 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
423 struct ext4_extent_idx *ix;
424 if (eh->eh_depth == 0)
425 /*
426 * No extra blocks allocated for extent meta data
427 */
428 return 0;
429 ix = EXT_FIRST_INDEX(eh);
430 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
431 retval = free_ext_idx(handle, inode, ix);
432 if (retval)
433 return retval;
434 }
435 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500436}
437
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400438int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500439{
440 handle_t *handle;
441 int retval = 0, i;
442 __le32 *i_data;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500443 struct ext4_inode_info *ei;
444 struct inode *tmp_inode = NULL;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400445 struct migrate_struct lb;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500446 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400447 __u32 goal;
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400448 uid_t owner[2];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500449
Theodore Ts'o83982b62009-01-06 14:53:16 -0500450 /*
451 * If the filesystem does not support extents, or the inode
452 * already is extent-based, error out.
453 */
454 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
455 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400456 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500457 return -EINVAL;
458
Valerie Clementb8356c42008-02-05 10:56:37 -0500459 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
460 /*
461 * don't migrate fast symlink
462 */
463 return retval;
464
Theodore Ts'o4b217632013-02-09 12:50:27 -0500465 /*
466 * Worst case we can touch the allocation bitmaps, a bgd
467 * block, and a block to link in the orphan list. We do need
468 * need to worry about credits for modifying the quota inode.
469 */
Theodore Ts'o9924a922013-02-08 21:59:22 -0500470 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
Theodore Ts'o4b217632013-02-09 12:50:27 -0500471 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
472
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500473 if (IS_ERR(handle)) {
474 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500475 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500476 }
Andreas Dilger11013912009-06-13 11:45:35 -0400477 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
478 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Eric W. Biederman08cefc72012-02-07 15:41:49 -0800479 owner[0] = i_uid_read(inode);
480 owner[1] = i_gid_read(inode);
Theodore Ts'of157a4a2009-06-13 11:09:42 -0400481 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400482 S_IFREG, NULL, goal, owner);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500483 if (IS_ERR(tmp_inode)) {
Dan Carpentera0cc9102012-02-20 17:53:06 -0500484 retval = PTR_ERR(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500485 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500486 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500487 }
488 i_size_write(tmp_inode, i_size_read(inode));
489 /*
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500490 * Set the i_nlink to zero so it will be deleted later
491 * when we drop inode reference.
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500492 */
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200493 clear_nlink(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500494
495 ext4_ext_tree_init(handle, tmp_inode);
496 ext4_orphan_add(handle, tmp_inode);
497 ext4_journal_stop(handle);
498
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500499 /*
500 * start with one credit accounted for
501 * superblock modification.
502 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300503 * For the tmp_inode we already have committed the
Anatol Pomozov70261f52013-08-28 14:40:12 -0400504 * transaction that created the inode. Later as and
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500505 * when we add extents we extent the journal
506 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500507 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400508 * Even though we take i_mutex we can still cause block
509 * allocation via mmap write to holes. If we have allocated
510 * new blocks we fail migrate. New block allocation will
511 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
512 * with i_data_sem held to prevent racing with block
513 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400514 */
Lukas Czernerc8b459f2014-05-12 12:55:07 -0400515 down_read(&EXT4_I(inode)->i_data_sem);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500516 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400517 up_read((&EXT4_I(inode)->i_data_sem));
518
Theodore Ts'o9924a922013-02-08 21:59:22 -0500519 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500520 if (IS_ERR(handle)) {
521 /*
522 * It is impossible to update on-disk structures without
523 * a handle, so just rollback in-core changes and live other
524 * work to orphan_list_cleanup()
525 */
526 ext4_orphan_del(NULL, tmp_inode);
527 retval = PTR_ERR(handle);
528 goto out;
529 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500530
531 ei = EXT4_I(inode);
532 i_data = ei->i_data;
533 memset(&lb, 0, sizeof(lb));
534
535 /* 32 bit block address 4 bytes */
536 max_entries = inode->i_sb->s_blocksize >> 2;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400537 for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500538 if (i_data[i]) {
539 retval = update_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400540 le32_to_cpu(i_data[i]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500541 if (retval)
542 goto err_out;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400543 } else
544 lb.curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500545 }
546 if (i_data[EXT4_IND_BLOCK]) {
547 retval = update_ind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400548 le32_to_cpu(i_data[EXT4_IND_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;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500553 if (i_data[EXT4_DIND_BLOCK]) {
554 retval = update_dind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400555 le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500556 if (retval)
557 goto err_out;
558 } else
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400559 lb.curr_block += max_entries * max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500560 if (i_data[EXT4_TIND_BLOCK]) {
561 retval = update_tind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400562 le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500563 if (retval)
564 goto err_out;
565 }
566 /*
567 * Build the last extent
568 */
569 retval = finish_range(handle, tmp_inode, &lb);
570err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500571 if (retval)
572 /*
573 * Failure case delete the extent information with the
574 * tmp_inode
575 */
576 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400577 else {
578 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
579 if (retval)
580 /*
581 * if we fail to swap inode data free the extent
582 * details of the tmp inode
583 */
584 free_ext_block(handle, tmp_inode);
585 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500586
587 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
588 if (ext4_journal_extend(handle, 1) != 0)
589 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500590
591 /*
592 * Mark the tmp_inode as of size zero
593 */
594 i_size_write(tmp_inode, 0);
595
596 /*
597 * set the i_blocks count to zero
598 * so that the ext4_delete_inode does the
599 * right job
600 *
601 * We don't need to take the i_lock because
602 * the inode is not visible to user space.
603 */
604 tmp_inode->i_blocks = 0;
605
606 /* Reset the extent details */
607 ext4_ext_tree_init(handle, tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500608 ext4_journal_stop(handle);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500609out:
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400610 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500611 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500612
613 return retval;
614}
Lukas Czerner0d14b092013-04-10 23:32:52 -0400615
616/*
617 * Migrate a simple extent-based inode to use the i_blocks[] array
618 */
619int ext4_ind_migrate(struct inode *inode)
620{
621 struct ext4_extent_header *eh;
622 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
623 struct ext4_inode_info *ei = EXT4_I(inode);
624 struct ext4_extent *ex;
625 unsigned int i, len;
626 ext4_fsblk_t blk;
627 handle_t *handle;
628 int ret;
629
630 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
631 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
632 (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
633 return -EINVAL;
634
Lukas Czerner43e50f52013-04-11 10:54:46 -0400635 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
636 EXT4_FEATURE_RO_COMPAT_BIGALLOC))
637 return -EOPNOTSUPP;
638
Lukas Czerner0d14b092013-04-10 23:32:52 -0400639 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
640 if (IS_ERR(handle))
641 return PTR_ERR(handle);
642
643 down_write(&EXT4_I(inode)->i_data_sem);
644 ret = ext4_ext_check_inode(inode);
645 if (ret)
646 goto errout;
647
648 eh = ext_inode_hdr(inode);
649 ex = EXT_FIRST_EXTENT(eh);
650 if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
651 eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
652 ret = -EOPNOTSUPP;
653 goto errout;
654 }
655 if (eh->eh_entries == 0)
656 blk = len = 0;
657 else {
658 len = le16_to_cpu(ex->ee_len);
659 blk = ext4_ext_pblock(ex);
660 if (len > EXT4_NDIR_BLOCKS) {
661 ret = -EOPNOTSUPP;
662 goto errout;
663 }
664 }
665
666 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
667 memset(ei->i_data, 0, sizeof(ei->i_data));
668 for (i=0; i < len; i++)
669 ei->i_data[i] = cpu_to_le32(blk++);
670 ext4_mark_inode_dirty(handle, inode);
671errout:
672 ext4_journal_stop(handle);
673 up_write(&EXT4_I(inode)->i_data_sem);
674 return ret;
675}