blob: b52374e4210221bc02c9cb3ad23f8027f21e77ad [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'oed8a1a72014-09-01 14:43:09 -040044 path = ext4_find_extent(inode, lb->first_block, NULL, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050045 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)) {
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040065 up_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050066 retval = ext4_journal_restart(handle, needed);
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040067 down_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050068 if (retval)
69 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050070 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050071 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050072 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050073 /*
74 * IF not able to extend the journal restart the journal
75 */
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040076 up_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050077 retval = ext4_journal_restart(handle, needed);
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040078 down_write((&EXT4_I(inode)->i_data_sem));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050079 if (retval)
80 goto err_out;
81 }
82 }
Theodore Ts'odfe50802014-09-01 14:37:09 -040083 retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050084err_out:
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -040085 up_write((&EXT4_I(inode)->i_data_sem));
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -040086 ext4_ext_drop_refs(path);
87 kfree(path);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050088 lb->first_pblock = 0;
89 return retval;
90}
91
92static int update_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -040093 ext4_fsblk_t pblock, struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050094{
95 int retval;
96 /*
97 * See if we can add on to the existing range (if it exists)
98 */
99 if (lb->first_pblock &&
100 (lb->last_pblock+1 == pblock) &&
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400101 (lb->last_block+1 == lb->curr_block)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500102 lb->last_pblock = pblock;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400103 lb->last_block = lb->curr_block;
104 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500105 return 0;
106 }
107 /*
108 * Start a new range.
109 */
110 retval = finish_range(handle, inode, lb);
111 lb->first_pblock = lb->last_pblock = pblock;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400112 lb->first_block = lb->last_block = lb->curr_block;
113 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500114 return retval;
115}
116
117static int update_ind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400118 ext4_fsblk_t pblock,
119 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500120{
121 struct buffer_head *bh;
122 __le32 *i_data;
123 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500124 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
125
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500126 bh = sb_bread(inode->i_sb, pblock);
127 if (!bh)
128 return -EIO;
129
130 i_data = (__le32 *)bh->b_data;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400131 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500132 if (i_data[i]) {
133 retval = update_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400134 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500135 if (retval)
136 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400137 } else {
138 lb->curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500139 }
140 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500141 put_bh(bh);
142 return retval;
143
144}
145
146static int update_dind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400147 ext4_fsblk_t pblock,
148 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500149{
150 struct buffer_head *bh;
151 __le32 *i_data;
152 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500153 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
154
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500155 bh = sb_bread(inode->i_sb, pblock);
156 if (!bh)
157 return -EIO;
158
159 i_data = (__le32 *)bh->b_data;
160 for (i = 0; i < max_entries; i++) {
161 if (i_data[i]) {
162 retval = update_ind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400163 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500164 if (retval)
165 break;
166 } else {
167 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400168 lb->curr_block += max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500169 }
170 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500171 put_bh(bh);
172 return retval;
173
174}
175
176static int update_tind_extent_range(handle_t *handle, struct inode *inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400177 ext4_fsblk_t pblock,
178 struct migrate_struct *lb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500179{
180 struct buffer_head *bh;
181 __le32 *i_data;
182 int i, retval = 0;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500183 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
184
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500185 bh = sb_bread(inode->i_sb, pblock);
186 if (!bh)
187 return -EIO;
188
189 i_data = (__le32 *)bh->b_data;
190 for (i = 0; i < max_entries; i++) {
191 if (i_data[i]) {
192 retval = update_dind_extent_range(handle, inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400193 le32_to_cpu(i_data[i]), lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500194 if (retval)
195 break;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400196 } else {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500197 /* Only update the file block number */
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400198 lb->curr_block += max_entries * max_entries;
199 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500200 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500201 put_bh(bh);
202 return retval;
203
204}
205
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500206static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
207{
208 int retval = 0, needed;
209
Frank Mayhar03901312009-01-07 00:06:22 -0500210 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500211 return 0;
212 /*
213 * We are freeing a blocks. During this we touch
214 * superblock, group descriptor and block bitmap.
215 * So allocate a credit of 3. We may update
216 * quota (user and group).
217 */
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500218 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500219
220 if (ext4_journal_extend(handle, needed) != 0)
221 retval = ext4_journal_restart(handle, needed);
222
223 return retval;
224}
225
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500226static int free_dind_blocks(handle_t *handle,
227 struct inode *inode, __le32 i_data)
228{
229 int i;
230 __le32 *tmp_idata;
231 struct buffer_head *bh;
232 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
233
234 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
235 if (!bh)
236 return -EIO;
237
238 tmp_idata = (__le32 *)bh->b_data;
239 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500240 if (tmp_idata[i]) {
241 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500242 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500243 le32_to_cpu(tmp_idata[i]), 1,
244 EXT4_FREE_BLOCKS_METADATA |
245 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500246 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500247 }
248 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500249 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500250 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500251 EXT4_FREE_BLOCKS_METADATA |
252 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500253 return 0;
254}
255
256static int free_tind_blocks(handle_t *handle,
257 struct inode *inode, __le32 i_data)
258{
259 int i, retval = 0;
260 __le32 *tmp_idata;
261 struct buffer_head *bh;
262 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
263
264 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
265 if (!bh)
266 return -EIO;
267
268 tmp_idata = (__le32 *)bh->b_data;
269 for (i = 0; i < max_entries; i++) {
270 if (tmp_idata[i]) {
271 retval = free_dind_blocks(handle,
272 inode, tmp_idata[i]);
273 if (retval) {
274 put_bh(bh);
275 return retval;
276 }
277 }
278 }
279 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500280 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500281 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500282 EXT4_FREE_BLOCKS_METADATA |
283 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500284 return 0;
285}
286
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500287static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500288{
289 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500290
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500291 /* ei->i_data[EXT4_IND_BLOCK] */
292 if (i_data[0]) {
293 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500294 ext4_free_blocks(handle, inode, NULL,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500295 le32_to_cpu(i_data[0]), 1,
296 EXT4_FREE_BLOCKS_METADATA |
297 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500298 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500299
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500300 /* ei->i_data[EXT4_DIND_BLOCK] */
301 if (i_data[1]) {
302 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500303 if (retval)
304 return retval;
305 }
306
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500307 /* ei->i_data[EXT4_TIND_BLOCK] */
308 if (i_data[2]) {
309 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500310 if (retval)
311 return retval;
312 }
313 return 0;
314}
315
316static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400317 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500318{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500319 int retval;
320 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500321 struct ext4_inode_info *ei = EXT4_I(inode);
322 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
323
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500324 /*
325 * One credit accounted for writing the
326 * i_data field of the original inode
327 */
328 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400329 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500330 retval = ext4_journal_restart(handle, 1);
331 if (retval)
332 goto err_out;
333 }
334
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500335 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
336 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
337 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
338
339 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500340 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400341 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400342 * happened after we started the migrate. We need to
343 * fail the migrate
344 */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500345 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400346 retval = -EAGAIN;
347 up_write(&EXT4_I(inode)->i_data_sem);
348 goto err_out;
349 } else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500350 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400351 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500352 * We have the extent map build with the tmp inode.
353 * Now copy the i_data across
354 */
Theodore Ts'o74e4e6d2011-05-03 09:34:42 -0400355 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500356 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
357
358 /*
359 * Update i_blocks with the new blocks that got
360 * allocated while adding extents for extent index
361 * blocks.
362 *
363 * While converting to extents we need not
364 * update the orignal inode i_blocks for extent blocks
365 * via quota APIs. The quota update happened via tmp_inode already.
366 */
367 spin_lock(&inode->i_lock);
368 inode->i_blocks += tmp_inode->i_blocks;
369 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500370 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500371
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500372 /*
373 * We mark the inode dirty after, because we decrement the
374 * i_blocks when freeing the indirect meta-data blocks
375 */
376 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500377 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500378
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500379err_out:
380 return retval;
381}
382
383static int free_ext_idx(handle_t *handle, struct inode *inode,
384 struct ext4_extent_idx *ix)
385{
386 int i, retval = 0;
387 ext4_fsblk_t block;
388 struct buffer_head *bh;
389 struct ext4_extent_header *eh;
390
Theodore Ts'obf89d162010-10-27 21:30:14 -0400391 block = ext4_idx_pblock(ix);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500392 bh = sb_bread(inode->i_sb, block);
393 if (!bh)
394 return -EIO;
395
396 eh = (struct ext4_extent_header *)bh->b_data;
397 if (eh->eh_depth != 0) {
398 ix = EXT_FIRST_INDEX(eh);
399 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
400 retval = free_ext_idx(handle, inode, ix);
401 if (retval)
402 break;
403 }
404 }
405 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500406 extend_credit_for_blkdel(handle, inode);
Peter Huewe7dc57612011-02-21 21:01:42 -0500407 ext4_free_blocks(handle, inode, NULL, block, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -0500408 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500409 return retval;
410}
411
412/*
413 * Free the extent meta data blocks only
414 */
415static int free_ext_block(handle_t *handle, struct inode *inode)
416{
417 int i, retval = 0;
418 struct ext4_inode_info *ei = EXT4_I(inode);
419 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
420 struct ext4_extent_idx *ix;
421 if (eh->eh_depth == 0)
422 /*
423 * No extra blocks allocated for extent meta data
424 */
425 return 0;
426 ix = EXT_FIRST_INDEX(eh);
427 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
428 retval = free_ext_idx(handle, inode, ix);
429 if (retval)
430 return retval;
431 }
432 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500433}
434
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400435int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500436{
437 handle_t *handle;
438 int retval = 0, i;
439 __le32 *i_data;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500440 struct ext4_inode_info *ei;
441 struct inode *tmp_inode = NULL;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400442 struct migrate_struct lb;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500443 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400444 __u32 goal;
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400445 uid_t owner[2];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500446
Theodore Ts'o83982b62009-01-06 14:53:16 -0500447 /*
448 * If the filesystem does not support extents, or the inode
449 * already is extent-based, error out.
450 */
451 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
452 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400453 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500454 return -EINVAL;
455
Valerie Clementb8356c42008-02-05 10:56:37 -0500456 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
457 /*
458 * don't migrate fast symlink
459 */
460 return retval;
461
Theodore Ts'o4b217632013-02-09 12:50:27 -0500462 /*
463 * Worst case we can touch the allocation bitmaps, a bgd
464 * block, and a block to link in the orphan list. We do need
465 * need to worry about credits for modifying the quota inode.
466 */
Theodore Ts'o9924a922013-02-08 21:59:22 -0500467 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
Theodore Ts'o4b217632013-02-09 12:50:27 -0500468 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
469
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500470 if (IS_ERR(handle)) {
471 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500472 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500473 }
Andreas Dilger11013912009-06-13 11:45:35 -0400474 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
475 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Eric W. Biederman08cefc72012-02-07 15:41:49 -0800476 owner[0] = i_uid_read(inode);
477 owner[1] = i_gid_read(inode);
David Howells2b0143b2015-03-17 22:25:59 +0000478 tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root),
Dmitry Monakhov5cb81da2011-10-29 09:05:00 -0400479 S_IFREG, NULL, goal, owner);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500480 if (IS_ERR(tmp_inode)) {
Dan Carpentera0cc9102012-02-20 17:53:06 -0500481 retval = PTR_ERR(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500482 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500483 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500484 }
485 i_size_write(tmp_inode, i_size_read(inode));
486 /*
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500487 * Set the i_nlink to zero so it will be deleted later
488 * when we drop inode reference.
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500489 */
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200490 clear_nlink(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500491
492 ext4_ext_tree_init(handle, tmp_inode);
493 ext4_orphan_add(handle, tmp_inode);
494 ext4_journal_stop(handle);
495
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500496 /*
497 * start with one credit accounted for
498 * superblock modification.
499 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300500 * For the tmp_inode we already have committed the
Anatol Pomozov70261f52013-08-28 14:40:12 -0400501 * transaction that created the inode. Later as and
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500502 * when we add extents we extent the journal
503 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500504 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400505 * Even though we take i_mutex we can still cause block
506 * allocation via mmap write to holes. If we have allocated
507 * new blocks we fail migrate. New block allocation will
508 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
509 * with i_data_sem held to prevent racing with block
510 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400511 */
Lukas Czernerc8b459f2014-05-12 12:55:07 -0400512 down_read(&EXT4_I(inode)->i_data_sem);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500513 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400514 up_read((&EXT4_I(inode)->i_data_sem));
515
Theodore Ts'o9924a922013-02-08 21:59:22 -0500516 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500517 if (IS_ERR(handle)) {
518 /*
519 * It is impossible to update on-disk structures without
520 * a handle, so just rollback in-core changes and live other
521 * work to orphan_list_cleanup()
522 */
523 ext4_orphan_del(NULL, tmp_inode);
524 retval = PTR_ERR(handle);
525 goto out;
526 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500527
528 ei = EXT4_I(inode);
529 i_data = ei->i_data;
530 memset(&lb, 0, sizeof(lb));
531
532 /* 32 bit block address 4 bytes */
533 max_entries = inode->i_sb->s_blocksize >> 2;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400534 for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500535 if (i_data[i]) {
536 retval = update_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400537 le32_to_cpu(i_data[i]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500538 if (retval)
539 goto err_out;
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400540 } else
541 lb.curr_block++;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500542 }
543 if (i_data[EXT4_IND_BLOCK]) {
544 retval = update_ind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400545 le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500546 if (retval)
547 goto err_out;
548 } else
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400549 lb.curr_block += max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500550 if (i_data[EXT4_DIND_BLOCK]) {
551 retval = update_dind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400552 le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500553 if (retval)
554 goto err_out;
555 } else
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400556 lb.curr_block += max_entries * max_entries;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500557 if (i_data[EXT4_TIND_BLOCK]) {
558 retval = update_tind_extent_range(handle, tmp_inode,
Dmitry Monakhovfba90ff2011-10-29 09:03:00 -0400559 le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500560 if (retval)
561 goto err_out;
562 }
563 /*
564 * Build the last extent
565 */
566 retval = finish_range(handle, tmp_inode, &lb);
567err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500568 if (retval)
569 /*
570 * Failure case delete the extent information with the
571 * tmp_inode
572 */
573 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400574 else {
575 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
576 if (retval)
577 /*
578 * if we fail to swap inode data free the extent
579 * details of the tmp inode
580 */
581 free_ext_block(handle, tmp_inode);
582 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500583
584 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
585 if (ext4_journal_extend(handle, 1) != 0)
586 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500587
588 /*
589 * Mark the tmp_inode as of size zero
590 */
591 i_size_write(tmp_inode, 0);
592
593 /*
594 * set the i_blocks count to zero
Wang Shilong58d86a52014-11-25 16:17:29 -0500595 * so that the ext4_evict_inode() does the
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500596 * right job
597 *
598 * We don't need to take the i_lock because
599 * the inode is not visible to user space.
600 */
601 tmp_inode->i_blocks = 0;
602
603 /* Reset the extent details */
604 ext4_ext_tree_init(handle, tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500605 ext4_journal_stop(handle);
Dmitry Monakhovf39490b2010-03-01 23:14:36 -0500606out:
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400607 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500608 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500609
610 return retval;
611}
Lukas Czerner0d14b092013-04-10 23:32:52 -0400612
613/*
614 * Migrate a simple extent-based inode to use the i_blocks[] array
615 */
616int ext4_ind_migrate(struct inode *inode)
617{
618 struct ext4_extent_header *eh;
619 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
620 struct ext4_inode_info *ei = EXT4_I(inode);
621 struct ext4_extent *ex;
622 unsigned int i, len;
623 ext4_fsblk_t blk;
624 handle_t *handle;
625 int ret;
626
627 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
628 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
629 (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
630 return -EINVAL;
631
Lukas Czerner43e50f52013-04-11 10:54:46 -0400632 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
633 EXT4_FEATURE_RO_COMPAT_BIGALLOC))
634 return -EOPNOTSUPP;
635
Lukas Czerner0d14b092013-04-10 23:32:52 -0400636 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
637 if (IS_ERR(handle))
638 return PTR_ERR(handle);
639
640 down_write(&EXT4_I(inode)->i_data_sem);
641 ret = ext4_ext_check_inode(inode);
642 if (ret)
643 goto errout;
644
645 eh = ext_inode_hdr(inode);
646 ex = EXT_FIRST_EXTENT(eh);
647 if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
648 eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
649 ret = -EOPNOTSUPP;
650 goto errout;
651 }
652 if (eh->eh_entries == 0)
653 blk = len = 0;
654 else {
655 len = le16_to_cpu(ex->ee_len);
656 blk = ext4_ext_pblock(ex);
657 if (len > EXT4_NDIR_BLOCKS) {
658 ret = -EOPNOTSUPP;
659 goto errout;
660 }
661 }
662
663 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
664 memset(ei->i_data, 0, sizeof(ei->i_data));
665 for (i=0; i < len; i++)
666 ei->i_data[i] = cpu_to_le32(blk++);
667 ext4_mark_inode_dirty(handle, inode);
668errout:
669 ext4_journal_stop(handle);
670 up_write(&EXT4_I(inode)->i_data_sem);
671 return ret;
672}