Root/
1 | /* |
2 | * linux/fs/ext3/resize.c |
3 | * |
4 | * Support for resizing an ext3 filesystem while it is mounted. |
5 | * |
6 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> |
7 | * |
8 | * This could probably be made into a module, because it is not often in use. |
9 | */ |
10 | |
11 | |
12 | #define EXT3FS_DEBUG |
13 | |
14 | #include <linux/ext3_jbd.h> |
15 | |
16 | #include <linux/errno.h> |
17 | #include <linux/slab.h> |
18 | |
19 | |
20 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
21 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) |
22 | |
23 | static int verify_group_input(struct super_block *sb, |
24 | struct ext3_new_group_data *input) |
25 | { |
26 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
27 | struct ext3_super_block *es = sbi->s_es; |
28 | ext3_fsblk_t start = le32_to_cpu(es->s_blocks_count); |
29 | ext3_fsblk_t end = start + input->blocks_count; |
30 | unsigned group = input->group; |
31 | ext3_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
32 | unsigned overhead = ext3_bg_has_super(sb, group) ? |
33 | (1 + ext3_bg_num_gdb(sb, group) + |
34 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
35 | ext3_fsblk_t metaend = start + overhead; |
36 | struct buffer_head *bh = NULL; |
37 | ext3_grpblk_t free_blocks_count; |
38 | int err = -EINVAL; |
39 | |
40 | input->free_blocks_count = free_blocks_count = |
41 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
42 | |
43 | if (test_opt(sb, DEBUG)) |
44 | printk(KERN_DEBUG "EXT3-fs: adding %s group %u: %u blocks " |
45 | "(%d free, %u reserved)\n", |
46 | ext3_bg_has_super(sb, input->group) ? "normal" : |
47 | "no-super", input->group, input->blocks_count, |
48 | free_blocks_count, input->reserved_blocks); |
49 | |
50 | if (group != sbi->s_groups_count) |
51 | ext3_warning(sb, __func__, |
52 | "Cannot add at group %u (only %lu groups)", |
53 | input->group, sbi->s_groups_count); |
54 | else if ((start - le32_to_cpu(es->s_first_data_block)) % |
55 | EXT3_BLOCKS_PER_GROUP(sb)) |
56 | ext3_warning(sb, __func__, "Last group not full"); |
57 | else if (input->reserved_blocks > input->blocks_count / 5) |
58 | ext3_warning(sb, __func__, "Reserved blocks too high (%u)", |
59 | input->reserved_blocks); |
60 | else if (free_blocks_count < 0) |
61 | ext3_warning(sb, __func__, "Bad blocks count %u", |
62 | input->blocks_count); |
63 | else if (!(bh = sb_bread(sb, end - 1))) |
64 | ext3_warning(sb, __func__, |
65 | "Cannot read last block ("E3FSBLK")", |
66 | end - 1); |
67 | else if (outside(input->block_bitmap, start, end)) |
68 | ext3_warning(sb, __func__, |
69 | "Block bitmap not in group (block %u)", |
70 | input->block_bitmap); |
71 | else if (outside(input->inode_bitmap, start, end)) |
72 | ext3_warning(sb, __func__, |
73 | "Inode bitmap not in group (block %u)", |
74 | input->inode_bitmap); |
75 | else if (outside(input->inode_table, start, end) || |
76 | outside(itend - 1, start, end)) |
77 | ext3_warning(sb, __func__, |
78 | "Inode table not in group (blocks %u-"E3FSBLK")", |
79 | input->inode_table, itend - 1); |
80 | else if (input->inode_bitmap == input->block_bitmap) |
81 | ext3_warning(sb, __func__, |
82 | "Block bitmap same as inode bitmap (%u)", |
83 | input->block_bitmap); |
84 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
85 | ext3_warning(sb, __func__, |
86 | "Block bitmap (%u) in inode table (%u-"E3FSBLK")", |
87 | input->block_bitmap, input->inode_table, itend-1); |
88 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
89 | ext3_warning(sb, __func__, |
90 | "Inode bitmap (%u) in inode table (%u-"E3FSBLK")", |
91 | input->inode_bitmap, input->inode_table, itend-1); |
92 | else if (inside(input->block_bitmap, start, metaend)) |
93 | ext3_warning(sb, __func__, |
94 | "Block bitmap (%u) in GDT table" |
95 | " ("E3FSBLK"-"E3FSBLK")", |
96 | input->block_bitmap, start, metaend - 1); |
97 | else if (inside(input->inode_bitmap, start, metaend)) |
98 | ext3_warning(sb, __func__, |
99 | "Inode bitmap (%u) in GDT table" |
100 | " ("E3FSBLK"-"E3FSBLK")", |
101 | input->inode_bitmap, start, metaend - 1); |
102 | else if (inside(input->inode_table, start, metaend) || |
103 | inside(itend - 1, start, metaend)) |
104 | ext3_warning(sb, __func__, |
105 | "Inode table (%u-"E3FSBLK") overlaps" |
106 | "GDT table ("E3FSBLK"-"E3FSBLK")", |
107 | input->inode_table, itend - 1, start, metaend - 1); |
108 | else |
109 | err = 0; |
110 | brelse(bh); |
111 | |
112 | return err; |
113 | } |
114 | |
115 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
116 | ext3_fsblk_t blk) |
117 | { |
118 | struct buffer_head *bh; |
119 | int err; |
120 | |
121 | bh = sb_getblk(sb, blk); |
122 | if (!bh) |
123 | return ERR_PTR(-EIO); |
124 | if ((err = ext3_journal_get_write_access(handle, bh))) { |
125 | brelse(bh); |
126 | bh = ERR_PTR(err); |
127 | } else { |
128 | lock_buffer(bh); |
129 | memset(bh->b_data, 0, sb->s_blocksize); |
130 | set_buffer_uptodate(bh); |
131 | unlock_buffer(bh); |
132 | } |
133 | |
134 | return bh; |
135 | } |
136 | |
137 | /* |
138 | * To avoid calling the atomic setbit hundreds or thousands of times, we only |
139 | * need to use it within a single byte (to ensure we get endianness right). |
140 | * We can use memset for the rest of the bitmap as there are no other users. |
141 | */ |
142 | static void mark_bitmap_end(int start_bit, int end_bit, char *bitmap) |
143 | { |
144 | int i; |
145 | |
146 | if (start_bit >= end_bit) |
147 | return; |
148 | |
149 | ext3_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); |
150 | for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) |
151 | ext3_set_bit(i, bitmap); |
152 | if (i < end_bit) |
153 | memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); |
154 | } |
155 | |
156 | /* |
157 | * If we have fewer than thresh credits, extend by EXT3_MAX_TRANS_DATA. |
158 | * If that fails, restart the transaction & regain write access for the |
159 | * buffer head which is used for block_bitmap modifications. |
160 | */ |
161 | static int extend_or_restart_transaction(handle_t *handle, int thresh, |
162 | struct buffer_head *bh) |
163 | { |
164 | int err; |
165 | |
166 | if (handle->h_buffer_credits >= thresh) |
167 | return 0; |
168 | |
169 | err = ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA); |
170 | if (err < 0) |
171 | return err; |
172 | if (err) { |
173 | err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA); |
174 | if (err) |
175 | return err; |
176 | err = ext3_journal_get_write_access(handle, bh); |
177 | if (err) |
178 | return err; |
179 | } |
180 | |
181 | return 0; |
182 | } |
183 | |
184 | /* |
185 | * Set up the block and inode bitmaps, and the inode table for the new group. |
186 | * This doesn't need to be part of the main transaction, since we are only |
187 | * changing blocks outside the actual filesystem. We still do journaling to |
188 | * ensure the recovery is correct in case of a failure just after resize. |
189 | * If any part of this fails, we simply abort the resize. |
190 | */ |
191 | static int setup_new_group_blocks(struct super_block *sb, |
192 | struct ext3_new_group_data *input) |
193 | { |
194 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
195 | ext3_fsblk_t start = ext3_group_first_block_no(sb, input->group); |
196 | int reserved_gdb = ext3_bg_has_super(sb, input->group) ? |
197 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0; |
198 | unsigned long gdblocks = ext3_bg_num_gdb(sb, input->group); |
199 | struct buffer_head *bh; |
200 | handle_t *handle; |
201 | ext3_fsblk_t block; |
202 | ext3_grpblk_t bit; |
203 | int i; |
204 | int err = 0, err2; |
205 | |
206 | /* This transaction may be extended/restarted along the way */ |
207 | handle = ext3_journal_start_sb(sb, EXT3_MAX_TRANS_DATA); |
208 | |
209 | if (IS_ERR(handle)) |
210 | return PTR_ERR(handle); |
211 | |
212 | lock_super(sb); |
213 | if (input->group != sbi->s_groups_count) { |
214 | err = -EBUSY; |
215 | goto exit_journal; |
216 | } |
217 | |
218 | if (IS_ERR(bh = bclean(handle, sb, input->block_bitmap))) { |
219 | err = PTR_ERR(bh); |
220 | goto exit_journal; |
221 | } |
222 | |
223 | if (ext3_bg_has_super(sb, input->group)) { |
224 | ext3_debug("mark backup superblock %#04lx (+0)\n", start); |
225 | ext3_set_bit(0, bh->b_data); |
226 | } |
227 | |
228 | /* Copy all of the GDT blocks into the backup in this group */ |
229 | for (i = 0, bit = 1, block = start + 1; |
230 | i < gdblocks; i++, block++, bit++) { |
231 | struct buffer_head *gdb; |
232 | |
233 | ext3_debug("update backup group %#04lx (+%d)\n", block, bit); |
234 | |
235 | err = extend_or_restart_transaction(handle, 1, bh); |
236 | if (err) |
237 | goto exit_bh; |
238 | |
239 | gdb = sb_getblk(sb, block); |
240 | if (!gdb) { |
241 | err = -EIO; |
242 | goto exit_bh; |
243 | } |
244 | if ((err = ext3_journal_get_write_access(handle, gdb))) { |
245 | brelse(gdb); |
246 | goto exit_bh; |
247 | } |
248 | lock_buffer(gdb); |
249 | memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size); |
250 | set_buffer_uptodate(gdb); |
251 | unlock_buffer(gdb); |
252 | ext3_journal_dirty_metadata(handle, gdb); |
253 | ext3_set_bit(bit, bh->b_data); |
254 | brelse(gdb); |
255 | } |
256 | |
257 | /* Zero out all of the reserved backup group descriptor table blocks */ |
258 | for (i = 0, bit = gdblocks + 1, block = start + bit; |
259 | i < reserved_gdb; i++, block++, bit++) { |
260 | struct buffer_head *gdb; |
261 | |
262 | ext3_debug("clear reserved block %#04lx (+%d)\n", block, bit); |
263 | |
264 | err = extend_or_restart_transaction(handle, 1, bh); |
265 | if (err) |
266 | goto exit_bh; |
267 | |
268 | if (IS_ERR(gdb = bclean(handle, sb, block))) { |
269 | err = PTR_ERR(bh); |
270 | goto exit_bh; |
271 | } |
272 | ext3_journal_dirty_metadata(handle, gdb); |
273 | ext3_set_bit(bit, bh->b_data); |
274 | brelse(gdb); |
275 | } |
276 | ext3_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap, |
277 | input->block_bitmap - start); |
278 | ext3_set_bit(input->block_bitmap - start, bh->b_data); |
279 | ext3_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap, |
280 | input->inode_bitmap - start); |
281 | ext3_set_bit(input->inode_bitmap - start, bh->b_data); |
282 | |
283 | /* Zero out all of the inode table blocks */ |
284 | for (i = 0, block = input->inode_table, bit = block - start; |
285 | i < sbi->s_itb_per_group; i++, bit++, block++) { |
286 | struct buffer_head *it; |
287 | |
288 | ext3_debug("clear inode block %#04lx (+%d)\n", block, bit); |
289 | |
290 | err = extend_or_restart_transaction(handle, 1, bh); |
291 | if (err) |
292 | goto exit_bh; |
293 | |
294 | if (IS_ERR(it = bclean(handle, sb, block))) { |
295 | err = PTR_ERR(it); |
296 | goto exit_bh; |
297 | } |
298 | ext3_journal_dirty_metadata(handle, it); |
299 | brelse(it); |
300 | ext3_set_bit(bit, bh->b_data); |
301 | } |
302 | |
303 | err = extend_or_restart_transaction(handle, 2, bh); |
304 | if (err) |
305 | goto exit_bh; |
306 | |
307 | mark_bitmap_end(input->blocks_count, EXT3_BLOCKS_PER_GROUP(sb), |
308 | bh->b_data); |
309 | ext3_journal_dirty_metadata(handle, bh); |
310 | brelse(bh); |
311 | |
312 | /* Mark unused entries in inode bitmap used */ |
313 | ext3_debug("clear inode bitmap %#04x (+%ld)\n", |
314 | input->inode_bitmap, input->inode_bitmap - start); |
315 | if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) { |
316 | err = PTR_ERR(bh); |
317 | goto exit_journal; |
318 | } |
319 | |
320 | mark_bitmap_end(EXT3_INODES_PER_GROUP(sb), EXT3_BLOCKS_PER_GROUP(sb), |
321 | bh->b_data); |
322 | ext3_journal_dirty_metadata(handle, bh); |
323 | exit_bh: |
324 | brelse(bh); |
325 | |
326 | exit_journal: |
327 | unlock_super(sb); |
328 | if ((err2 = ext3_journal_stop(handle)) && !err) |
329 | err = err2; |
330 | |
331 | return err; |
332 | } |
333 | |
334 | /* |
335 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an |
336 | * ext3 filesystem. The counters should be initialized to 1, 5, and 7 before |
337 | * calling this for the first time. In a sparse filesystem it will be the |
338 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... |
339 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... |
340 | */ |
341 | static unsigned ext3_list_backups(struct super_block *sb, unsigned *three, |
342 | unsigned *five, unsigned *seven) |
343 | { |
344 | unsigned *min = three; |
345 | int mult = 3; |
346 | unsigned ret; |
347 | |
348 | if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, |
349 | EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { |
350 | ret = *min; |
351 | *min += 1; |
352 | return ret; |
353 | } |
354 | |
355 | if (*five < *min) { |
356 | min = five; |
357 | mult = 5; |
358 | } |
359 | if (*seven < *min) { |
360 | min = seven; |
361 | mult = 7; |
362 | } |
363 | |
364 | ret = *min; |
365 | *min *= mult; |
366 | |
367 | return ret; |
368 | } |
369 | |
370 | /* |
371 | * Check that all of the backup GDT blocks are held in the primary GDT block. |
372 | * It is assumed that they are stored in group order. Returns the number of |
373 | * groups in current filesystem that have BACKUPS, or -ve error code. |
374 | */ |
375 | static int verify_reserved_gdb(struct super_block *sb, |
376 | struct buffer_head *primary) |
377 | { |
378 | const ext3_fsblk_t blk = primary->b_blocknr; |
379 | const unsigned long end = EXT3_SB(sb)->s_groups_count; |
380 | unsigned three = 1; |
381 | unsigned five = 5; |
382 | unsigned seven = 7; |
383 | unsigned grp; |
384 | __le32 *p = (__le32 *)primary->b_data; |
385 | int gdbackups = 0; |
386 | |
387 | while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) { |
388 | if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){ |
389 | ext3_warning(sb, __func__, |
390 | "reserved GDT "E3FSBLK |
391 | " missing grp %d ("E3FSBLK")", |
392 | blk, grp, |
393 | grp * EXT3_BLOCKS_PER_GROUP(sb) + blk); |
394 | return -EINVAL; |
395 | } |
396 | if (++gdbackups > EXT3_ADDR_PER_BLOCK(sb)) |
397 | return -EFBIG; |
398 | } |
399 | |
400 | return gdbackups; |
401 | } |
402 | |
403 | /* |
404 | * Called when we need to bring a reserved group descriptor table block into |
405 | * use from the resize inode. The primary copy of the new GDT block currently |
406 | * is an indirect block (under the double indirect block in the resize inode). |
407 | * The new backup GDT blocks will be stored as leaf blocks in this indirect |
408 | * block, in group order. Even though we know all the block numbers we need, |
409 | * we check to ensure that the resize inode has actually reserved these blocks. |
410 | * |
411 | * Don't need to update the block bitmaps because the blocks are still in use. |
412 | * |
413 | * We get all of the error cases out of the way, so that we are sure to not |
414 | * fail once we start modifying the data on disk, because JBD has no rollback. |
415 | */ |
416 | static int add_new_gdb(handle_t *handle, struct inode *inode, |
417 | struct ext3_new_group_data *input, |
418 | struct buffer_head **primary) |
419 | { |
420 | struct super_block *sb = inode->i_sb; |
421 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; |
422 | unsigned long gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); |
423 | ext3_fsblk_t gdblock = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
424 | struct buffer_head **o_group_desc, **n_group_desc; |
425 | struct buffer_head *dind; |
426 | int gdbackups; |
427 | struct ext3_iloc iloc; |
428 | __le32 *data; |
429 | int err; |
430 | |
431 | if (test_opt(sb, DEBUG)) |
432 | printk(KERN_DEBUG |
433 | "EXT3-fs: ext3_add_new_gdb: adding group block %lu\n", |
434 | gdb_num); |
435 | |
436 | /* |
437 | * If we are not using the primary superblock/GDT copy don't resize, |
438 | * because the user tools have no way of handling this. Probably a |
439 | * bad time to do it anyways. |
440 | */ |
441 | if (EXT3_SB(sb)->s_sbh->b_blocknr != |
442 | le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block)) { |
443 | ext3_warning(sb, __func__, |
444 | "won't resize using backup superblock at %llu", |
445 | (unsigned long long)EXT3_SB(sb)->s_sbh->b_blocknr); |
446 | return -EPERM; |
447 | } |
448 | |
449 | *primary = sb_bread(sb, gdblock); |
450 | if (!*primary) |
451 | return -EIO; |
452 | |
453 | if ((gdbackups = verify_reserved_gdb(sb, *primary)) < 0) { |
454 | err = gdbackups; |
455 | goto exit_bh; |
456 | } |
457 | |
458 | data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; |
459 | dind = sb_bread(sb, le32_to_cpu(*data)); |
460 | if (!dind) { |
461 | err = -EIO; |
462 | goto exit_bh; |
463 | } |
464 | |
465 | data = (__le32 *)dind->b_data; |
466 | if (le32_to_cpu(data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)]) != gdblock) { |
467 | ext3_warning(sb, __func__, |
468 | "new group %u GDT block "E3FSBLK" not reserved", |
469 | input->group, gdblock); |
470 | err = -EINVAL; |
471 | goto exit_dind; |
472 | } |
473 | |
474 | if ((err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh))) |
475 | goto exit_dind; |
476 | |
477 | if ((err = ext3_journal_get_write_access(handle, *primary))) |
478 | goto exit_sbh; |
479 | |
480 | if ((err = ext3_journal_get_write_access(handle, dind))) |
481 | goto exit_primary; |
482 | |
483 | /* ext3_reserve_inode_write() gets a reference on the iloc */ |
484 | if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) |
485 | goto exit_dindj; |
486 | |
487 | n_group_desc = kmalloc((gdb_num + 1) * sizeof(struct buffer_head *), |
488 | GFP_NOFS); |
489 | if (!n_group_desc) { |
490 | err = -ENOMEM; |
491 | ext3_warning (sb, __func__, |
492 | "not enough memory for %lu groups", gdb_num + 1); |
493 | goto exit_inode; |
494 | } |
495 | |
496 | /* |
497 | * Finally, we have all of the possible failures behind us... |
498 | * |
499 | * Remove new GDT block from inode double-indirect block and clear out |
500 | * the new GDT block for use (which also "frees" the backup GDT blocks |
501 | * from the reserved inode). We don't need to change the bitmaps for |
502 | * these blocks, because they are marked as in-use from being in the |
503 | * reserved inode, and will become GDT blocks (primary and backup). |
504 | */ |
505 | data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)] = 0; |
506 | ext3_journal_dirty_metadata(handle, dind); |
507 | brelse(dind); |
508 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
509 | ext3_mark_iloc_dirty(handle, inode, &iloc); |
510 | memset((*primary)->b_data, 0, sb->s_blocksize); |
511 | ext3_journal_dirty_metadata(handle, *primary); |
512 | |
513 | o_group_desc = EXT3_SB(sb)->s_group_desc; |
514 | memcpy(n_group_desc, o_group_desc, |
515 | EXT3_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
516 | n_group_desc[gdb_num] = *primary; |
517 | EXT3_SB(sb)->s_group_desc = n_group_desc; |
518 | EXT3_SB(sb)->s_gdb_count++; |
519 | kfree(o_group_desc); |
520 | |
521 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
522 | ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); |
523 | |
524 | return 0; |
525 | |
526 | exit_inode: |
527 | //ext3_journal_release_buffer(handle, iloc.bh); |
528 | brelse(iloc.bh); |
529 | exit_dindj: |
530 | //ext3_journal_release_buffer(handle, dind); |
531 | exit_primary: |
532 | //ext3_journal_release_buffer(handle, *primary); |
533 | exit_sbh: |
534 | //ext3_journal_release_buffer(handle, *primary); |
535 | exit_dind: |
536 | brelse(dind); |
537 | exit_bh: |
538 | brelse(*primary); |
539 | |
540 | ext3_debug("leaving with error %d\n", err); |
541 | return err; |
542 | } |
543 | |
544 | /* |
545 | * Called when we are adding a new group which has a backup copy of each of |
546 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. |
547 | * We need to add these reserved backup GDT blocks to the resize inode, so |
548 | * that they are kept for future resizing and not allocated to files. |
549 | * |
550 | * Each reserved backup GDT block will go into a different indirect block. |
551 | * The indirect blocks are actually the primary reserved GDT blocks, |
552 | * so we know in advance what their block numbers are. We only get the |
553 | * double-indirect block to verify it is pointing to the primary reserved |
554 | * GDT blocks so we don't overwrite a data block by accident. The reserved |
555 | * backup GDT blocks are stored in their reserved primary GDT block. |
556 | */ |
557 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, |
558 | struct ext3_new_group_data *input) |
559 | { |
560 | struct super_block *sb = inode->i_sb; |
561 | int reserved_gdb =le16_to_cpu(EXT3_SB(sb)->s_es->s_reserved_gdt_blocks); |
562 | struct buffer_head **primary; |
563 | struct buffer_head *dind; |
564 | struct ext3_iloc iloc; |
565 | ext3_fsblk_t blk; |
566 | __le32 *data, *end; |
567 | int gdbackups = 0; |
568 | int res, i; |
569 | int err; |
570 | |
571 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
572 | if (!primary) |
573 | return -ENOMEM; |
574 | |
575 | data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; |
576 | dind = sb_bread(sb, le32_to_cpu(*data)); |
577 | if (!dind) { |
578 | err = -EIO; |
579 | goto exit_free; |
580 | } |
581 | |
582 | blk = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + EXT3_SB(sb)->s_gdb_count; |
583 | data = (__le32 *)dind->b_data + (EXT3_SB(sb)->s_gdb_count % |
584 | EXT3_ADDR_PER_BLOCK(sb)); |
585 | end = (__le32 *)dind->b_data + EXT3_ADDR_PER_BLOCK(sb); |
586 | |
587 | /* Get each reserved primary GDT block and verify it holds backups */ |
588 | for (res = 0; res < reserved_gdb; res++, blk++) { |
589 | if (le32_to_cpu(*data) != blk) { |
590 | ext3_warning(sb, __func__, |
591 | "reserved block "E3FSBLK |
592 | " not at offset %ld", |
593 | blk, |
594 | (long)(data - (__le32 *)dind->b_data)); |
595 | err = -EINVAL; |
596 | goto exit_bh; |
597 | } |
598 | primary[res] = sb_bread(sb, blk); |
599 | if (!primary[res]) { |
600 | err = -EIO; |
601 | goto exit_bh; |
602 | } |
603 | if ((gdbackups = verify_reserved_gdb(sb, primary[res])) < 0) { |
604 | brelse(primary[res]); |
605 | err = gdbackups; |
606 | goto exit_bh; |
607 | } |
608 | if (++data >= end) |
609 | data = (__le32 *)dind->b_data; |
610 | } |
611 | |
612 | for (i = 0; i < reserved_gdb; i++) { |
613 | if ((err = ext3_journal_get_write_access(handle, primary[i]))) { |
614 | /* |
615 | int j; |
616 | for (j = 0; j < i; j++) |
617 | ext3_journal_release_buffer(handle, primary[j]); |
618 | */ |
619 | goto exit_bh; |
620 | } |
621 | } |
622 | |
623 | if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) |
624 | goto exit_bh; |
625 | |
626 | /* |
627 | * Finally we can add each of the reserved backup GDT blocks from |
628 | * the new group to its reserved primary GDT block. |
629 | */ |
630 | blk = input->group * EXT3_BLOCKS_PER_GROUP(sb); |
631 | for (i = 0; i < reserved_gdb; i++) { |
632 | int err2; |
633 | data = (__le32 *)primary[i]->b_data; |
634 | /* printk("reserving backup %lu[%u] = %lu\n", |
635 | primary[i]->b_blocknr, gdbackups, |
636 | blk + primary[i]->b_blocknr); */ |
637 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); |
638 | err2 = ext3_journal_dirty_metadata(handle, primary[i]); |
639 | if (!err) |
640 | err = err2; |
641 | } |
642 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; |
643 | ext3_mark_iloc_dirty(handle, inode, &iloc); |
644 | |
645 | exit_bh: |
646 | while (--res >= 0) |
647 | brelse(primary[res]); |
648 | brelse(dind); |
649 | |
650 | exit_free: |
651 | kfree(primary); |
652 | |
653 | return err; |
654 | } |
655 | |
656 | /* |
657 | * Update the backup copies of the ext3 metadata. These don't need to be part |
658 | * of the main resize transaction, because e2fsck will re-write them if there |
659 | * is a problem (basically only OOM will cause a problem). However, we |
660 | * _should_ update the backups if possible, in case the primary gets trashed |
661 | * for some reason and we need to run e2fsck from a backup superblock. The |
662 | * important part is that the new block and inode counts are in the backup |
663 | * superblocks, and the location of the new group metadata in the GDT backups. |
664 | * |
665 | * We do not need lock_super() for this, because these blocks are not |
666 | * otherwise touched by the filesystem code when it is mounted. We don't |
667 | * need to worry about last changing from sbi->s_groups_count, because the |
668 | * worst that can happen is that we do not copy the full number of backups |
669 | * at this time. The resize which changed s_groups_count will backup again. |
670 | */ |
671 | static void update_backups(struct super_block *sb, |
672 | int blk_off, char *data, int size) |
673 | { |
674 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
675 | const unsigned long last = sbi->s_groups_count; |
676 | const int bpg = EXT3_BLOCKS_PER_GROUP(sb); |
677 | unsigned three = 1; |
678 | unsigned five = 5; |
679 | unsigned seven = 7; |
680 | unsigned group; |
681 | int rest = sb->s_blocksize - size; |
682 | handle_t *handle; |
683 | int err = 0, err2; |
684 | |
685 | handle = ext3_journal_start_sb(sb, EXT3_MAX_TRANS_DATA); |
686 | if (IS_ERR(handle)) { |
687 | group = 1; |
688 | err = PTR_ERR(handle); |
689 | goto exit_err; |
690 | } |
691 | |
692 | while ((group = ext3_list_backups(sb, &three, &five, &seven)) < last) { |
693 | struct buffer_head *bh; |
694 | |
695 | /* Out of journal space, and can't get more - abort - so sad */ |
696 | if (handle->h_buffer_credits == 0 && |
697 | ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA) && |
698 | (err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA))) |
699 | break; |
700 | |
701 | bh = sb_getblk(sb, group * bpg + blk_off); |
702 | if (!bh) { |
703 | err = -EIO; |
704 | break; |
705 | } |
706 | ext3_debug("update metadata backup %#04lx\n", |
707 | (unsigned long)bh->b_blocknr); |
708 | if ((err = ext3_journal_get_write_access(handle, bh))) |
709 | break; |
710 | lock_buffer(bh); |
711 | memcpy(bh->b_data, data, size); |
712 | if (rest) |
713 | memset(bh->b_data + size, 0, rest); |
714 | set_buffer_uptodate(bh); |
715 | unlock_buffer(bh); |
716 | ext3_journal_dirty_metadata(handle, bh); |
717 | brelse(bh); |
718 | } |
719 | if ((err2 = ext3_journal_stop(handle)) && !err) |
720 | err = err2; |
721 | |
722 | /* |
723 | * Ugh! Need to have e2fsck write the backup copies. It is too |
724 | * late to revert the resize, we shouldn't fail just because of |
725 | * the backup copies (they are only needed in case of corruption). |
726 | * |
727 | * However, if we got here we have a journal problem too, so we |
728 | * can't really start a transaction to mark the superblock. |
729 | * Chicken out and just set the flag on the hope it will be written |
730 | * to disk, and if not - we will simply wait until next fsck. |
731 | */ |
732 | exit_err: |
733 | if (err) { |
734 | ext3_warning(sb, __func__, |
735 | "can't update backup for group %d (err %d), " |
736 | "forcing fsck on next reboot", group, err); |
737 | sbi->s_mount_state &= ~EXT3_VALID_FS; |
738 | sbi->s_es->s_state &= cpu_to_le16(~EXT3_VALID_FS); |
739 | mark_buffer_dirty(sbi->s_sbh); |
740 | } |
741 | } |
742 | |
743 | /* Add group descriptor data to an existing or new group descriptor block. |
744 | * Ensure we handle all possible error conditions _before_ we start modifying |
745 | * the filesystem, because we cannot abort the transaction and not have it |
746 | * write the data to disk. |
747 | * |
748 | * If we are on a GDT block boundary, we need to get the reserved GDT block. |
749 | * Otherwise, we may need to add backup GDT blocks for a sparse group. |
750 | * |
751 | * We only need to hold the superblock lock while we are actually adding |
752 | * in the new group's counts to the superblock. Prior to that we have |
753 | * not really "added" the group at all. We re-check that we are still |
754 | * adding in the last group in case things have changed since verifying. |
755 | */ |
756 | int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input) |
757 | { |
758 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
759 | struct ext3_super_block *es = sbi->s_es; |
760 | int reserved_gdb = ext3_bg_has_super(sb, input->group) ? |
761 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
762 | struct buffer_head *primary = NULL; |
763 | struct ext3_group_desc *gdp; |
764 | struct inode *inode = NULL; |
765 | handle_t *handle; |
766 | int gdb_off, gdb_num; |
767 | int err, err2; |
768 | |
769 | gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); |
770 | gdb_off = input->group % EXT3_DESC_PER_BLOCK(sb); |
771 | |
772 | if (gdb_off == 0 && !EXT3_HAS_RO_COMPAT_FEATURE(sb, |
773 | EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { |
774 | ext3_warning(sb, __func__, |
775 | "Can't resize non-sparse filesystem further"); |
776 | return -EPERM; |
777 | } |
778 | |
779 | if (le32_to_cpu(es->s_blocks_count) + input->blocks_count < |
780 | le32_to_cpu(es->s_blocks_count)) { |
781 | ext3_warning(sb, __func__, "blocks_count overflow\n"); |
782 | return -EINVAL; |
783 | } |
784 | |
785 | if (le32_to_cpu(es->s_inodes_count) + EXT3_INODES_PER_GROUP(sb) < |
786 | le32_to_cpu(es->s_inodes_count)) { |
787 | ext3_warning(sb, __func__, "inodes_count overflow\n"); |
788 | return -EINVAL; |
789 | } |
790 | |
791 | if (reserved_gdb || gdb_off == 0) { |
792 | if (!EXT3_HAS_COMPAT_FEATURE(sb, |
793 | EXT3_FEATURE_COMPAT_RESIZE_INODE) |
794 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { |
795 | ext3_warning(sb, __func__, |
796 | "No reserved GDT blocks, can't resize"); |
797 | return -EPERM; |
798 | } |
799 | inode = ext3_iget(sb, EXT3_RESIZE_INO); |
800 | if (IS_ERR(inode)) { |
801 | ext3_warning(sb, __func__, |
802 | "Error opening resize inode"); |
803 | return PTR_ERR(inode); |
804 | } |
805 | } |
806 | |
807 | if ((err = verify_group_input(sb, input))) |
808 | goto exit_put; |
809 | |
810 | if ((err = setup_new_group_blocks(sb, input))) |
811 | goto exit_put; |
812 | |
813 | /* |
814 | * We will always be modifying at least the superblock and a GDT |
815 | * block. If we are adding a group past the last current GDT block, |
816 | * we will also modify the inode and the dindirect block. If we |
817 | * are adding a group with superblock/GDT backups we will also |
818 | * modify each of the reserved GDT dindirect blocks. |
819 | */ |
820 | handle = ext3_journal_start_sb(sb, |
821 | ext3_bg_has_super(sb, input->group) ? |
822 | 3 + reserved_gdb : 4); |
823 | if (IS_ERR(handle)) { |
824 | err = PTR_ERR(handle); |
825 | goto exit_put; |
826 | } |
827 | |
828 | lock_super(sb); |
829 | if (input->group != sbi->s_groups_count) { |
830 | ext3_warning(sb, __func__, |
831 | "multiple resizers run on filesystem!"); |
832 | err = -EBUSY; |
833 | goto exit_journal; |
834 | } |
835 | |
836 | if ((err = ext3_journal_get_write_access(handle, sbi->s_sbh))) |
837 | goto exit_journal; |
838 | |
839 | /* |
840 | * We will only either add reserved group blocks to a backup group |
841 | * or remove reserved blocks for the first group in a new group block. |
842 | * Doing both would be mean more complex code, and sane people don't |
843 | * use non-sparse filesystems anymore. This is already checked above. |
844 | */ |
845 | if (gdb_off) { |
846 | primary = sbi->s_group_desc[gdb_num]; |
847 | if ((err = ext3_journal_get_write_access(handle, primary))) |
848 | goto exit_journal; |
849 | |
850 | if (reserved_gdb && ext3_bg_num_gdb(sb, input->group) && |
851 | (err = reserve_backup_gdb(handle, inode, input))) |
852 | goto exit_journal; |
853 | } else if ((err = add_new_gdb(handle, inode, input, &primary))) |
854 | goto exit_journal; |
855 | |
856 | /* |
857 | * OK, now we've set up the new group. Time to make it active. |
858 | * |
859 | * Current kernels don't lock all allocations via lock_super(), |
860 | * so we have to be safe wrt. concurrent accesses the group |
861 | * data. So we need to be careful to set all of the relevant |
862 | * group descriptor data etc. *before* we enable the group. |
863 | * |
864 | * The key field here is sbi->s_groups_count: as long as |
865 | * that retains its old value, nobody is going to access the new |
866 | * group. |
867 | * |
868 | * So first we update all the descriptor metadata for the new |
869 | * group; then we update the total disk blocks count; then we |
870 | * update the groups count to enable the group; then finally we |
871 | * update the free space counts so that the system can start |
872 | * using the new disk blocks. |
873 | */ |
874 | |
875 | /* Update group descriptor block for new group */ |
876 | gdp = (struct ext3_group_desc *)primary->b_data + gdb_off; |
877 | |
878 | gdp->bg_block_bitmap = cpu_to_le32(input->block_bitmap); |
879 | gdp->bg_inode_bitmap = cpu_to_le32(input->inode_bitmap); |
880 | gdp->bg_inode_table = cpu_to_le32(input->inode_table); |
881 | gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count); |
882 | gdp->bg_free_inodes_count = cpu_to_le16(EXT3_INODES_PER_GROUP(sb)); |
883 | |
884 | /* |
885 | * Make the new blocks and inodes valid next. We do this before |
886 | * increasing the group count so that once the group is enabled, |
887 | * all of its blocks and inodes are already valid. |
888 | * |
889 | * We always allocate group-by-group, then block-by-block or |
890 | * inode-by-inode within a group, so enabling these |
891 | * blocks/inodes before the group is live won't actually let us |
892 | * allocate the new space yet. |
893 | */ |
894 | le32_add_cpu(&es->s_blocks_count, input->blocks_count); |
895 | le32_add_cpu(&es->s_inodes_count, EXT3_INODES_PER_GROUP(sb)); |
896 | |
897 | /* |
898 | * We need to protect s_groups_count against other CPUs seeing |
899 | * inconsistent state in the superblock. |
900 | * |
901 | * The precise rules we use are: |
902 | * |
903 | * * Writers of s_groups_count *must* hold lock_super |
904 | * AND |
905 | * * Writers must perform a smp_wmb() after updating all dependent |
906 | * data and before modifying the groups count |
907 | * |
908 | * * Readers must hold lock_super() over the access |
909 | * OR |
910 | * * Readers must perform an smp_rmb() after reading the groups count |
911 | * and before reading any dependent data. |
912 | * |
913 | * NB. These rules can be relaxed when checking the group count |
914 | * while freeing data, as we can only allocate from a block |
915 | * group after serialising against the group count, and we can |
916 | * only then free after serialising in turn against that |
917 | * allocation. |
918 | */ |
919 | smp_wmb(); |
920 | |
921 | /* Update the global fs size fields */ |
922 | sbi->s_groups_count++; |
923 | |
924 | ext3_journal_dirty_metadata(handle, primary); |
925 | |
926 | /* Update the reserved block counts only once the new group is |
927 | * active. */ |
928 | le32_add_cpu(&es->s_r_blocks_count, input->reserved_blocks); |
929 | |
930 | /* Update the free space counts */ |
931 | percpu_counter_add(&sbi->s_freeblocks_counter, |
932 | input->free_blocks_count); |
933 | percpu_counter_add(&sbi->s_freeinodes_counter, |
934 | EXT3_INODES_PER_GROUP(sb)); |
935 | |
936 | ext3_journal_dirty_metadata(handle, sbi->s_sbh); |
937 | |
938 | exit_journal: |
939 | unlock_super(sb); |
940 | if ((err2 = ext3_journal_stop(handle)) && !err) |
941 | err = err2; |
942 | if (!err) { |
943 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
944 | sizeof(struct ext3_super_block)); |
945 | update_backups(sb, primary->b_blocknr, primary->b_data, |
946 | primary->b_size); |
947 | } |
948 | exit_put: |
949 | iput(inode); |
950 | return err; |
951 | } /* ext3_group_add */ |
952 | |
953 | /* Extend the filesystem to the new number of blocks specified. This entry |
954 | * point is only used to extend the current filesystem to the end of the last |
955 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" |
956 | * for emergencies (because it has no dependencies on reserved blocks). |
957 | * |
958 | * If we _really_ wanted, we could use default values to call ext3_group_add() |
959 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
960 | * GDT blocks are reserved to grow to the desired size. |
961 | */ |
962 | int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es, |
963 | ext3_fsblk_t n_blocks_count) |
964 | { |
965 | ext3_fsblk_t o_blocks_count; |
966 | unsigned long o_groups_count; |
967 | ext3_grpblk_t last; |
968 | ext3_grpblk_t add; |
969 | struct buffer_head * bh; |
970 | handle_t *handle; |
971 | int err; |
972 | unsigned long freed_blocks; |
973 | |
974 | /* We don't need to worry about locking wrt other resizers just |
975 | * yet: we're going to revalidate es->s_blocks_count after |
976 | * taking lock_super() below. */ |
977 | o_blocks_count = le32_to_cpu(es->s_blocks_count); |
978 | o_groups_count = EXT3_SB(sb)->s_groups_count; |
979 | |
980 | if (test_opt(sb, DEBUG)) |
981 | printk(KERN_DEBUG "EXT3-fs: extending last group from "E3FSBLK" uto "E3FSBLK" blocks\n", |
982 | o_blocks_count, n_blocks_count); |
983 | |
984 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) |
985 | return 0; |
986 | |
987 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
988 | printk(KERN_ERR "EXT3-fs: filesystem on %s:" |
989 | " too large to resize to %lu blocks safely\n", |
990 | sb->s_id, n_blocks_count); |
991 | if (sizeof(sector_t) < 8) |
992 | ext3_warning(sb, __func__, |
993 | "CONFIG_LBDAF not enabled\n"); |
994 | return -EINVAL; |
995 | } |
996 | |
997 | if (n_blocks_count < o_blocks_count) { |
998 | ext3_warning(sb, __func__, |
999 | "can't shrink FS - resize aborted"); |
1000 | return -EBUSY; |
1001 | } |
1002 | |
1003 | /* Handle the remaining blocks in the last group only. */ |
1004 | last = (o_blocks_count - le32_to_cpu(es->s_first_data_block)) % |
1005 | EXT3_BLOCKS_PER_GROUP(sb); |
1006 | |
1007 | if (last == 0) { |
1008 | ext3_warning(sb, __func__, |
1009 | "need to use ext2online to resize further"); |
1010 | return -EPERM; |
1011 | } |
1012 | |
1013 | add = EXT3_BLOCKS_PER_GROUP(sb) - last; |
1014 | |
1015 | if (o_blocks_count + add < o_blocks_count) { |
1016 | ext3_warning(sb, __func__, "blocks_count overflow"); |
1017 | return -EINVAL; |
1018 | } |
1019 | |
1020 | if (o_blocks_count + add > n_blocks_count) |
1021 | add = n_blocks_count - o_blocks_count; |
1022 | |
1023 | if (o_blocks_count + add < n_blocks_count) |
1024 | ext3_warning(sb, __func__, |
1025 | "will only finish group ("E3FSBLK |
1026 | " blocks, %u new)", |
1027 | o_blocks_count + add, add); |
1028 | |
1029 | /* See if the device is actually as big as what was requested */ |
1030 | bh = sb_bread(sb, o_blocks_count + add -1); |
1031 | if (!bh) { |
1032 | ext3_warning(sb, __func__, |
1033 | "can't read last block, resize aborted"); |
1034 | return -ENOSPC; |
1035 | } |
1036 | brelse(bh); |
1037 | |
1038 | /* We will update the superblock, one block bitmap, and |
1039 | * one group descriptor via ext3_free_blocks(). |
1040 | */ |
1041 | handle = ext3_journal_start_sb(sb, 3); |
1042 | if (IS_ERR(handle)) { |
1043 | err = PTR_ERR(handle); |
1044 | ext3_warning(sb, __func__, "error %d on journal start",err); |
1045 | goto exit_put; |
1046 | } |
1047 | |
1048 | lock_super(sb); |
1049 | if (o_blocks_count != le32_to_cpu(es->s_blocks_count)) { |
1050 | ext3_warning(sb, __func__, |
1051 | "multiple resizers run on filesystem!"); |
1052 | unlock_super(sb); |
1053 | ext3_journal_stop(handle); |
1054 | err = -EBUSY; |
1055 | goto exit_put; |
1056 | } |
1057 | |
1058 | if ((err = ext3_journal_get_write_access(handle, |
1059 | EXT3_SB(sb)->s_sbh))) { |
1060 | ext3_warning(sb, __func__, |
1061 | "error %d on journal write access", err); |
1062 | unlock_super(sb); |
1063 | ext3_journal_stop(handle); |
1064 | goto exit_put; |
1065 | } |
1066 | es->s_blocks_count = cpu_to_le32(o_blocks_count + add); |
1067 | ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); |
1068 | unlock_super(sb); |
1069 | ext3_debug("freeing blocks %lu through "E3FSBLK"\n", o_blocks_count, |
1070 | o_blocks_count + add); |
1071 | ext3_free_blocks_sb(handle, sb, o_blocks_count, add, &freed_blocks); |
1072 | ext3_debug("freed blocks "E3FSBLK" through "E3FSBLK"\n", o_blocks_count, |
1073 | o_blocks_count + add); |
1074 | if ((err = ext3_journal_stop(handle))) |
1075 | goto exit_put; |
1076 | if (test_opt(sb, DEBUG)) |
1077 | printk(KERN_DEBUG "EXT3-fs: extended group to %u blocks\n", |
1078 | le32_to_cpu(es->s_blocks_count)); |
1079 | update_backups(sb, EXT3_SB(sb)->s_sbh->b_blocknr, (char *)es, |
1080 | sizeof(struct ext3_super_block)); |
1081 | exit_put: |
1082 | return err; |
1083 | } /* ext3_group_extend */ |
1084 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9