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Commit | Line | Data |
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1da177e4 LT |
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 | #include <linux/config.h> | |
12 | ||
13 | #define EXT3FS_DEBUG | |
14 | ||
15 | #include <linux/sched.h> | |
16 | #include <linux/smp_lock.h> | |
17 | #include <linux/ext3_jbd.h> | |
18 | ||
19 | #include <linux/errno.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | ||
23 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) | |
24 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
25 | ||
26 | static int verify_group_input(struct super_block *sb, | |
27 | struct ext3_new_group_data *input) | |
28 | { | |
29 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
30 | struct ext3_super_block *es = sbi->s_es; | |
1c2bf374 MC |
31 | ext3_fsblk_t start = le32_to_cpu(es->s_blocks_count); |
32 | ext3_fsblk_t end = start + input->blocks_count; | |
1da177e4 | 33 | unsigned group = input->group; |
1c2bf374 | 34 | ext3_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
1da177e4 LT |
35 | unsigned overhead = ext3_bg_has_super(sb, group) ? |
36 | (1 + ext3_bg_num_gdb(sb, group) + | |
37 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
1c2bf374 | 38 | ext3_fsblk_t metaend = start + overhead; |
1da177e4 | 39 | struct buffer_head *bh = NULL; |
1c2bf374 | 40 | ext3_grpblk_t free_blocks_count; |
1da177e4 LT |
41 | int err = -EINVAL; |
42 | ||
43 | input->free_blocks_count = free_blocks_count = | |
44 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; | |
45 | ||
46 | if (test_opt(sb, DEBUG)) | |
47 | printk(KERN_DEBUG "EXT3-fs: adding %s group %u: %u blocks " | |
48 | "(%d free, %u reserved)\n", | |
49 | ext3_bg_has_super(sb, input->group) ? "normal" : | |
50 | "no-super", input->group, input->blocks_count, | |
51 | free_blocks_count, input->reserved_blocks); | |
52 | ||
53 | if (group != sbi->s_groups_count) | |
54 | ext3_warning(sb, __FUNCTION__, | |
55 | "Cannot add at group %u (only %lu groups)", | |
56 | input->group, sbi->s_groups_count); | |
57 | else if ((start - le32_to_cpu(es->s_first_data_block)) % | |
58 | EXT3_BLOCKS_PER_GROUP(sb)) | |
59 | ext3_warning(sb, __FUNCTION__, "Last group not full"); | |
60 | else if (input->reserved_blocks > input->blocks_count / 5) | |
61 | ext3_warning(sb, __FUNCTION__, "Reserved blocks too high (%u)", | |
62 | input->reserved_blocks); | |
63 | else if (free_blocks_count < 0) | |
64 | ext3_warning(sb, __FUNCTION__, "Bad blocks count %u", | |
65 | input->blocks_count); | |
66 | else if (!(bh = sb_bread(sb, end - 1))) | |
1c2bf374 MC |
67 | ext3_warning(sb, __FUNCTION__, |
68 | "Cannot read last block ("E3FSBLK")", | |
1da177e4 LT |
69 | end - 1); |
70 | else if (outside(input->block_bitmap, start, end)) | |
71 | ext3_warning(sb, __FUNCTION__, | |
72 | "Block bitmap not in group (block %u)", | |
73 | input->block_bitmap); | |
74 | else if (outside(input->inode_bitmap, start, end)) | |
75 | ext3_warning(sb, __FUNCTION__, | |
76 | "Inode bitmap not in group (block %u)", | |
77 | input->inode_bitmap); | |
78 | else if (outside(input->inode_table, start, end) || | |
79 | outside(itend - 1, start, end)) | |
80 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 | 81 | "Inode table not in group (blocks %u-"E3FSBLK")", |
1da177e4 LT |
82 | input->inode_table, itend - 1); |
83 | else if (input->inode_bitmap == input->block_bitmap) | |
84 | ext3_warning(sb, __FUNCTION__, | |
85 | "Block bitmap same as inode bitmap (%u)", | |
86 | input->block_bitmap); | |
87 | else if (inside(input->block_bitmap, input->inode_table, itend)) | |
88 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 | 89 | "Block bitmap (%u) in inode table (%u-"E3FSBLK")", |
1da177e4 LT |
90 | input->block_bitmap, input->inode_table, itend-1); |
91 | else if (inside(input->inode_bitmap, input->inode_table, itend)) | |
92 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 | 93 | "Inode bitmap (%u) in inode table (%u-"E3FSBLK")", |
1da177e4 LT |
94 | input->inode_bitmap, input->inode_table, itend-1); |
95 | else if (inside(input->block_bitmap, start, metaend)) | |
96 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 MC |
97 | "Block bitmap (%u) in GDT table" |
98 | " ("E3FSBLK"-"E3FSBLK")", | |
1da177e4 LT |
99 | input->block_bitmap, start, metaend - 1); |
100 | else if (inside(input->inode_bitmap, start, metaend)) | |
101 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 MC |
102 | "Inode bitmap (%u) in GDT table" |
103 | " ("E3FSBLK"-"E3FSBLK")", | |
1da177e4 LT |
104 | input->inode_bitmap, start, metaend - 1); |
105 | else if (inside(input->inode_table, start, metaend) || | |
106 | inside(itend - 1, start, metaend)) | |
107 | ext3_warning(sb, __FUNCTION__, | |
1c2bf374 MC |
108 | "Inode table (%u-"E3FSBLK") overlaps" |
109 | "GDT table ("E3FSBLK"-"E3FSBLK")", | |
1da177e4 LT |
110 | input->inode_table, itend - 1, start, metaend - 1); |
111 | else | |
112 | err = 0; | |
113 | brelse(bh); | |
114 | ||
115 | return err; | |
116 | } | |
117 | ||
118 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, | |
43d23f90 | 119 | ext3_fsblk_t blk) |
1da177e4 LT |
120 | { |
121 | struct buffer_head *bh; | |
122 | int err; | |
123 | ||
124 | bh = sb_getblk(sb, blk); | |
2973dfdb GOC |
125 | if (!bh) |
126 | return ERR_PTR(-EIO); | |
1da177e4 LT |
127 | if ((err = ext3_journal_get_write_access(handle, bh))) { |
128 | brelse(bh); | |
129 | bh = ERR_PTR(err); | |
130 | } else { | |
131 | lock_buffer(bh); | |
132 | memset(bh->b_data, 0, sb->s_blocksize); | |
133 | set_buffer_uptodate(bh); | |
134 | unlock_buffer(bh); | |
135 | } | |
136 | ||
137 | return bh; | |
138 | } | |
139 | ||
140 | /* | |
141 | * To avoid calling the atomic setbit hundreds or thousands of times, we only | |
142 | * need to use it within a single byte (to ensure we get endianness right). | |
143 | * We can use memset for the rest of the bitmap as there are no other users. | |
144 | */ | |
145 | static void mark_bitmap_end(int start_bit, int end_bit, char *bitmap) | |
146 | { | |
147 | int i; | |
148 | ||
149 | if (start_bit >= end_bit) | |
150 | return; | |
151 | ||
152 | ext3_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); | |
153 | for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) | |
154 | ext3_set_bit(i, bitmap); | |
155 | if (i < end_bit) | |
156 | memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); | |
157 | } | |
158 | ||
159 | /* | |
160 | * Set up the block and inode bitmaps, and the inode table for the new group. | |
161 | * This doesn't need to be part of the main transaction, since we are only | |
162 | * changing blocks outside the actual filesystem. We still do journaling to | |
163 | * ensure the recovery is correct in case of a failure just after resize. | |
164 | * If any part of this fails, we simply abort the resize. | |
165 | */ | |
166 | static int setup_new_group_blocks(struct super_block *sb, | |
167 | struct ext3_new_group_data *input) | |
168 | { | |
169 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
43d23f90 | 170 | ext3_fsblk_t start = ext3_group_first_block_no(sb, input->group); |
1da177e4 LT |
171 | int reserved_gdb = ext3_bg_has_super(sb, input->group) ? |
172 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0; | |
173 | unsigned long gdblocks = ext3_bg_num_gdb(sb, input->group); | |
174 | struct buffer_head *bh; | |
175 | handle_t *handle; | |
43d23f90 | 176 | ext3_fsblk_t block; |
1c2bf374 | 177 | ext3_grpblk_t bit; |
1da177e4 LT |
178 | int i; |
179 | int err = 0, err2; | |
180 | ||
181 | handle = ext3_journal_start_sb(sb, reserved_gdb + gdblocks + | |
182 | 2 + sbi->s_itb_per_group); | |
183 | if (IS_ERR(handle)) | |
184 | return PTR_ERR(handle); | |
185 | ||
186 | lock_super(sb); | |
187 | if (input->group != sbi->s_groups_count) { | |
188 | err = -EBUSY; | |
189 | goto exit_journal; | |
190 | } | |
191 | ||
192 | if (IS_ERR(bh = bclean(handle, sb, input->block_bitmap))) { | |
193 | err = PTR_ERR(bh); | |
194 | goto exit_journal; | |
195 | } | |
196 | ||
197 | if (ext3_bg_has_super(sb, input->group)) { | |
198 | ext3_debug("mark backup superblock %#04lx (+0)\n", start); | |
199 | ext3_set_bit(0, bh->b_data); | |
200 | } | |
201 | ||
202 | /* Copy all of the GDT blocks into the backup in this group */ | |
203 | for (i = 0, bit = 1, block = start + 1; | |
204 | i < gdblocks; i++, block++, bit++) { | |
205 | struct buffer_head *gdb; | |
206 | ||
207 | ext3_debug("update backup group %#04lx (+%d)\n", block, bit); | |
208 | ||
209 | gdb = sb_getblk(sb, block); | |
2973dfdb GOC |
210 | if (!gdb) { |
211 | err = -EIO; | |
212 | goto exit_bh; | |
213 | } | |
1da177e4 LT |
214 | if ((err = ext3_journal_get_write_access(handle, gdb))) { |
215 | brelse(gdb); | |
216 | goto exit_bh; | |
217 | } | |
218 | lock_buffer(bh); | |
de0bb97a | 219 | memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, bh->b_size); |
1da177e4 LT |
220 | set_buffer_uptodate(gdb); |
221 | unlock_buffer(bh); | |
222 | ext3_journal_dirty_metadata(handle, gdb); | |
223 | ext3_set_bit(bit, bh->b_data); | |
224 | brelse(gdb); | |
225 | } | |
226 | ||
227 | /* Zero out all of the reserved backup group descriptor table blocks */ | |
228 | for (i = 0, bit = gdblocks + 1, block = start + bit; | |
229 | i < reserved_gdb; i++, block++, bit++) { | |
230 | struct buffer_head *gdb; | |
231 | ||
232 | ext3_debug("clear reserved block %#04lx (+%d)\n", block, bit); | |
233 | ||
234 | if (IS_ERR(gdb = bclean(handle, sb, block))) { | |
235 | err = PTR_ERR(bh); | |
236 | goto exit_bh; | |
237 | } | |
238 | ext3_journal_dirty_metadata(handle, gdb); | |
239 | ext3_set_bit(bit, bh->b_data); | |
240 | brelse(gdb); | |
241 | } | |
242 | ext3_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap, | |
243 | input->block_bitmap - start); | |
244 | ext3_set_bit(input->block_bitmap - start, bh->b_data); | |
245 | ext3_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap, | |
246 | input->inode_bitmap - start); | |
247 | ext3_set_bit(input->inode_bitmap - start, bh->b_data); | |
248 | ||
249 | /* Zero out all of the inode table blocks */ | |
250 | for (i = 0, block = input->inode_table, bit = block - start; | |
251 | i < sbi->s_itb_per_group; i++, bit++, block++) { | |
252 | struct buffer_head *it; | |
253 | ||
8bdac5d1 | 254 | ext3_debug("clear inode block %#04lx (+%d)\n", block, bit); |
1da177e4 LT |
255 | if (IS_ERR(it = bclean(handle, sb, block))) { |
256 | err = PTR_ERR(it); | |
257 | goto exit_bh; | |
258 | } | |
259 | ext3_journal_dirty_metadata(handle, it); | |
260 | brelse(it); | |
261 | ext3_set_bit(bit, bh->b_data); | |
262 | } | |
263 | mark_bitmap_end(input->blocks_count, EXT3_BLOCKS_PER_GROUP(sb), | |
264 | bh->b_data); | |
265 | ext3_journal_dirty_metadata(handle, bh); | |
266 | brelse(bh); | |
267 | ||
268 | /* Mark unused entries in inode bitmap used */ | |
269 | ext3_debug("clear inode bitmap %#04x (+%ld)\n", | |
270 | input->inode_bitmap, input->inode_bitmap - start); | |
271 | if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) { | |
272 | err = PTR_ERR(bh); | |
273 | goto exit_journal; | |
274 | } | |
275 | ||
276 | mark_bitmap_end(EXT3_INODES_PER_GROUP(sb), EXT3_BLOCKS_PER_GROUP(sb), | |
277 | bh->b_data); | |
278 | ext3_journal_dirty_metadata(handle, bh); | |
279 | exit_bh: | |
280 | brelse(bh); | |
281 | ||
282 | exit_journal: | |
283 | unlock_super(sb); | |
284 | if ((err2 = ext3_journal_stop(handle)) && !err) | |
285 | err = err2; | |
286 | ||
287 | return err; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
292 | * ext3 filesystem. The counters should be initialized to 1, 5, and 7 before | |
293 | * calling this for the first time. In a sparse filesystem it will be the | |
294 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
295 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
296 | */ | |
297 | static unsigned ext3_list_backups(struct super_block *sb, unsigned *three, | |
298 | unsigned *five, unsigned *seven) | |
299 | { | |
300 | unsigned *min = three; | |
301 | int mult = 3; | |
302 | unsigned ret; | |
303 | ||
304 | if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, | |
305 | EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
306 | ret = *min; | |
307 | *min += 1; | |
308 | return ret; | |
309 | } | |
310 | ||
311 | if (*five < *min) { | |
312 | min = five; | |
313 | mult = 5; | |
314 | } | |
315 | if (*seven < *min) { | |
316 | min = seven; | |
317 | mult = 7; | |
318 | } | |
319 | ||
320 | ret = *min; | |
321 | *min *= mult; | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
328 | * It is assumed that they are stored in group order. Returns the number of | |
329 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
330 | */ | |
331 | static int verify_reserved_gdb(struct super_block *sb, | |
332 | struct buffer_head *primary) | |
333 | { | |
43d23f90 | 334 | const ext3_fsblk_t blk = primary->b_blocknr; |
1da177e4 LT |
335 | const unsigned long end = EXT3_SB(sb)->s_groups_count; |
336 | unsigned three = 1; | |
337 | unsigned five = 5; | |
338 | unsigned seven = 7; | |
339 | unsigned grp; | |
340 | __u32 *p = (__u32 *)primary->b_data; | |
341 | int gdbackups = 0; | |
342 | ||
343 | while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) { | |
344 | if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){ | |
345 | ext3_warning(sb, __FUNCTION__, | |
43d23f90 MC |
346 | "reserved GDT "E3FSBLK |
347 | " missing grp %d ("E3FSBLK")", | |
1da177e4 LT |
348 | blk, grp, |
349 | grp * EXT3_BLOCKS_PER_GROUP(sb) + blk); | |
350 | return -EINVAL; | |
351 | } | |
352 | if (++gdbackups > EXT3_ADDR_PER_BLOCK(sb)) | |
353 | return -EFBIG; | |
354 | } | |
355 | ||
356 | return gdbackups; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Called when we need to bring a reserved group descriptor table block into | |
361 | * use from the resize inode. The primary copy of the new GDT block currently | |
362 | * is an indirect block (under the double indirect block in the resize inode). | |
363 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
364 | * block, in group order. Even though we know all the block numbers we need, | |
365 | * we check to ensure that the resize inode has actually reserved these blocks. | |
366 | * | |
367 | * Don't need to update the block bitmaps because the blocks are still in use. | |
368 | * | |
369 | * We get all of the error cases out of the way, so that we are sure to not | |
370 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
371 | */ | |
372 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
373 | struct ext3_new_group_data *input, | |
374 | struct buffer_head **primary) | |
375 | { | |
376 | struct super_block *sb = inode->i_sb; | |
377 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
378 | unsigned long gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); | |
43d23f90 | 379 | ext3_fsblk_t gdblock = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
1da177e4 LT |
380 | struct buffer_head **o_group_desc, **n_group_desc; |
381 | struct buffer_head *dind; | |
382 | int gdbackups; | |
383 | struct ext3_iloc iloc; | |
384 | __u32 *data; | |
385 | int err; | |
386 | ||
387 | if (test_opt(sb, DEBUG)) | |
388 | printk(KERN_DEBUG | |
389 | "EXT3-fs: ext3_add_new_gdb: adding group block %lu\n", | |
390 | gdb_num); | |
391 | ||
392 | /* | |
393 | * If we are not using the primary superblock/GDT copy don't resize, | |
394 | * because the user tools have no way of handling this. Probably a | |
395 | * bad time to do it anyways. | |
396 | */ | |
397 | if (EXT3_SB(sb)->s_sbh->b_blocknr != | |
398 | le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block)) { | |
399 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 400 | "won't resize using backup superblock at %llu", |
1da177e4 LT |
401 | (unsigned long long)EXT3_SB(sb)->s_sbh->b_blocknr); |
402 | return -EPERM; | |
403 | } | |
404 | ||
405 | *primary = sb_bread(sb, gdblock); | |
406 | if (!*primary) | |
407 | return -EIO; | |
408 | ||
409 | if ((gdbackups = verify_reserved_gdb(sb, *primary)) < 0) { | |
410 | err = gdbackups; | |
411 | goto exit_bh; | |
412 | } | |
413 | ||
414 | data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; | |
415 | dind = sb_bread(sb, le32_to_cpu(*data)); | |
416 | if (!dind) { | |
417 | err = -EIO; | |
418 | goto exit_bh; | |
419 | } | |
420 | ||
421 | data = (__u32 *)dind->b_data; | |
422 | if (le32_to_cpu(data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)]) != gdblock) { | |
423 | ext3_warning(sb, __FUNCTION__, | |
43d23f90 | 424 | "new group %u GDT block "E3FSBLK" not reserved", |
1da177e4 LT |
425 | input->group, gdblock); |
426 | err = -EINVAL; | |
427 | goto exit_dind; | |
428 | } | |
429 | ||
430 | if ((err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh))) | |
431 | goto exit_dind; | |
432 | ||
433 | if ((err = ext3_journal_get_write_access(handle, *primary))) | |
434 | goto exit_sbh; | |
435 | ||
436 | if ((err = ext3_journal_get_write_access(handle, dind))) | |
437 | goto exit_primary; | |
438 | ||
439 | /* ext3_reserve_inode_write() gets a reference on the iloc */ | |
440 | if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) | |
441 | goto exit_dindj; | |
442 | ||
443 | n_group_desc = (struct buffer_head **)kmalloc((gdb_num + 1) * | |
444 | sizeof(struct buffer_head *), GFP_KERNEL); | |
445 | if (!n_group_desc) { | |
446 | err = -ENOMEM; | |
447 | ext3_warning (sb, __FUNCTION__, | |
448 | "not enough memory for %lu groups", gdb_num + 1); | |
449 | goto exit_inode; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Finally, we have all of the possible failures behind us... | |
454 | * | |
455 | * Remove new GDT block from inode double-indirect block and clear out | |
456 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
457 | * from the reserved inode). We don't need to change the bitmaps for | |
458 | * these blocks, because they are marked as in-use from being in the | |
459 | * reserved inode, and will become GDT blocks (primary and backup). | |
460 | */ | |
461 | data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)] = 0; | |
462 | ext3_journal_dirty_metadata(handle, dind); | |
463 | brelse(dind); | |
464 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; | |
465 | ext3_mark_iloc_dirty(handle, inode, &iloc); | |
466 | memset((*primary)->b_data, 0, sb->s_blocksize); | |
467 | ext3_journal_dirty_metadata(handle, *primary); | |
468 | ||
469 | o_group_desc = EXT3_SB(sb)->s_group_desc; | |
470 | memcpy(n_group_desc, o_group_desc, | |
471 | EXT3_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
472 | n_group_desc[gdb_num] = *primary; | |
473 | EXT3_SB(sb)->s_group_desc = n_group_desc; | |
474 | EXT3_SB(sb)->s_gdb_count++; | |
475 | kfree(o_group_desc); | |
476 | ||
477 | es->s_reserved_gdt_blocks = | |
478 | cpu_to_le16(le16_to_cpu(es->s_reserved_gdt_blocks) - 1); | |
479 | ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); | |
480 | ||
481 | return 0; | |
482 | ||
483 | exit_inode: | |
484 | //ext3_journal_release_buffer(handle, iloc.bh); | |
485 | brelse(iloc.bh); | |
486 | exit_dindj: | |
487 | //ext3_journal_release_buffer(handle, dind); | |
488 | exit_primary: | |
489 | //ext3_journal_release_buffer(handle, *primary); | |
490 | exit_sbh: | |
491 | //ext3_journal_release_buffer(handle, *primary); | |
492 | exit_dind: | |
493 | brelse(dind); | |
494 | exit_bh: | |
495 | brelse(*primary); | |
496 | ||
497 | ext3_debug("leaving with error %d\n", err); | |
498 | return err; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Called when we are adding a new group which has a backup copy of each of | |
503 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
504 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
505 | * that they are kept for future resizing and not allocated to files. | |
506 | * | |
507 | * Each reserved backup GDT block will go into a different indirect block. | |
508 | * The indirect blocks are actually the primary reserved GDT blocks, | |
509 | * so we know in advance what their block numbers are. We only get the | |
510 | * double-indirect block to verify it is pointing to the primary reserved | |
511 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
512 | * backup GDT blocks are stored in their reserved primary GDT block. | |
513 | */ | |
514 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
515 | struct ext3_new_group_data *input) | |
516 | { | |
517 | struct super_block *sb = inode->i_sb; | |
518 | int reserved_gdb =le16_to_cpu(EXT3_SB(sb)->s_es->s_reserved_gdt_blocks); | |
519 | struct buffer_head **primary; | |
520 | struct buffer_head *dind; | |
521 | struct ext3_iloc iloc; | |
43d23f90 | 522 | ext3_fsblk_t blk; |
1da177e4 LT |
523 | __u32 *data, *end; |
524 | int gdbackups = 0; | |
525 | int res, i; | |
526 | int err; | |
527 | ||
528 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_KERNEL); | |
529 | if (!primary) | |
530 | return -ENOMEM; | |
531 | ||
532 | data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK; | |
533 | dind = sb_bread(sb, le32_to_cpu(*data)); | |
534 | if (!dind) { | |
535 | err = -EIO; | |
536 | goto exit_free; | |
537 | } | |
538 | ||
539 | blk = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + EXT3_SB(sb)->s_gdb_count; | |
540 | data = (__u32 *)dind->b_data + EXT3_SB(sb)->s_gdb_count; | |
541 | end = (__u32 *)dind->b_data + EXT3_ADDR_PER_BLOCK(sb); | |
542 | ||
543 | /* Get each reserved primary GDT block and verify it holds backups */ | |
544 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
545 | if (le32_to_cpu(*data) != blk) { | |
546 | ext3_warning(sb, __FUNCTION__, | |
43d23f90 MC |
547 | "reserved block "E3FSBLK |
548 | " not at offset %ld", | |
1da177e4 LT |
549 | blk, (long)(data - (__u32 *)dind->b_data)); |
550 | err = -EINVAL; | |
551 | goto exit_bh; | |
552 | } | |
553 | primary[res] = sb_bread(sb, blk); | |
554 | if (!primary[res]) { | |
555 | err = -EIO; | |
556 | goto exit_bh; | |
557 | } | |
558 | if ((gdbackups = verify_reserved_gdb(sb, primary[res])) < 0) { | |
559 | brelse(primary[res]); | |
560 | err = gdbackups; | |
561 | goto exit_bh; | |
562 | } | |
563 | if (++data >= end) | |
564 | data = (__u32 *)dind->b_data; | |
565 | } | |
566 | ||
567 | for (i = 0; i < reserved_gdb; i++) { | |
568 | if ((err = ext3_journal_get_write_access(handle, primary[i]))) { | |
569 | /* | |
570 | int j; | |
571 | for (j = 0; j < i; j++) | |
572 | ext3_journal_release_buffer(handle, primary[j]); | |
573 | */ | |
574 | goto exit_bh; | |
575 | } | |
576 | } | |
577 | ||
578 | if ((err = ext3_reserve_inode_write(handle, inode, &iloc))) | |
579 | goto exit_bh; | |
580 | ||
581 | /* | |
582 | * Finally we can add each of the reserved backup GDT blocks from | |
583 | * the new group to its reserved primary GDT block. | |
584 | */ | |
585 | blk = input->group * EXT3_BLOCKS_PER_GROUP(sb); | |
586 | for (i = 0; i < reserved_gdb; i++) { | |
587 | int err2; | |
588 | data = (__u32 *)primary[i]->b_data; | |
589 | /* printk("reserving backup %lu[%u] = %lu\n", | |
590 | primary[i]->b_blocknr, gdbackups, | |
591 | blk + primary[i]->b_blocknr); */ | |
592 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
593 | err2 = ext3_journal_dirty_metadata(handle, primary[i]); | |
594 | if (!err) | |
595 | err = err2; | |
596 | } | |
597 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
598 | ext3_mark_iloc_dirty(handle, inode, &iloc); | |
599 | ||
600 | exit_bh: | |
601 | while (--res >= 0) | |
602 | brelse(primary[res]); | |
603 | brelse(dind); | |
604 | ||
605 | exit_free: | |
606 | kfree(primary); | |
607 | ||
608 | return err; | |
609 | } | |
610 | ||
611 | /* | |
612 | * Update the backup copies of the ext3 metadata. These don't need to be part | |
613 | * of the main resize transaction, because e2fsck will re-write them if there | |
614 | * is a problem (basically only OOM will cause a problem). However, we | |
615 | * _should_ update the backups if possible, in case the primary gets trashed | |
616 | * for some reason and we need to run e2fsck from a backup superblock. The | |
617 | * important part is that the new block and inode counts are in the backup | |
618 | * superblocks, and the location of the new group metadata in the GDT backups. | |
619 | * | |
620 | * We do not need lock_super() for this, because these blocks are not | |
621 | * otherwise touched by the filesystem code when it is mounted. We don't | |
622 | * need to worry about last changing from sbi->s_groups_count, because the | |
623 | * worst that can happen is that we do not copy the full number of backups | |
624 | * at this time. The resize which changed s_groups_count will backup again. | |
625 | */ | |
626 | static void update_backups(struct super_block *sb, | |
627 | int blk_off, char *data, int size) | |
628 | { | |
629 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
630 | const unsigned long last = sbi->s_groups_count; | |
631 | const int bpg = EXT3_BLOCKS_PER_GROUP(sb); | |
632 | unsigned three = 1; | |
633 | unsigned five = 5; | |
634 | unsigned seven = 7; | |
635 | unsigned group; | |
636 | int rest = sb->s_blocksize - size; | |
637 | handle_t *handle; | |
638 | int err = 0, err2; | |
639 | ||
640 | handle = ext3_journal_start_sb(sb, EXT3_MAX_TRANS_DATA); | |
641 | if (IS_ERR(handle)) { | |
642 | group = 1; | |
643 | err = PTR_ERR(handle); | |
644 | goto exit_err; | |
645 | } | |
646 | ||
647 | while ((group = ext3_list_backups(sb, &three, &five, &seven)) < last) { | |
648 | struct buffer_head *bh; | |
649 | ||
650 | /* Out of journal space, and can't get more - abort - so sad */ | |
651 | if (handle->h_buffer_credits == 0 && | |
652 | ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA) && | |
653 | (err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA))) | |
654 | break; | |
655 | ||
656 | bh = sb_getblk(sb, group * bpg + blk_off); | |
2973dfdb GOC |
657 | if (!bh) { |
658 | err = -EIO; | |
659 | break; | |
660 | } | |
8bdac5d1 GOC |
661 | ext3_debug("update metadata backup %#04lx\n", |
662 | (unsigned long)bh->b_blocknr); | |
1da177e4 LT |
663 | if ((err = ext3_journal_get_write_access(handle, bh))) |
664 | break; | |
665 | lock_buffer(bh); | |
666 | memcpy(bh->b_data, data, size); | |
667 | if (rest) | |
668 | memset(bh->b_data + size, 0, rest); | |
669 | set_buffer_uptodate(bh); | |
670 | unlock_buffer(bh); | |
671 | ext3_journal_dirty_metadata(handle, bh); | |
672 | brelse(bh); | |
673 | } | |
674 | if ((err2 = ext3_journal_stop(handle)) && !err) | |
675 | err = err2; | |
676 | ||
677 | /* | |
678 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
679 | * late to revert the resize, we shouldn't fail just because of | |
680 | * the backup copies (they are only needed in case of corruption). | |
681 | * | |
682 | * However, if we got here we have a journal problem too, so we | |
683 | * can't really start a transaction to mark the superblock. | |
684 | * Chicken out and just set the flag on the hope it will be written | |
685 | * to disk, and if not - we will simply wait until next fsck. | |
686 | */ | |
687 | exit_err: | |
688 | if (err) { | |
689 | ext3_warning(sb, __FUNCTION__, | |
690 | "can't update backup for group %d (err %d), " | |
9f40668d | 691 | "forcing fsck on next reboot", group, err); |
1da177e4 LT |
692 | sbi->s_mount_state &= ~EXT3_VALID_FS; |
693 | sbi->s_es->s_state &= ~cpu_to_le16(EXT3_VALID_FS); | |
694 | mark_buffer_dirty(sbi->s_sbh); | |
695 | } | |
696 | } | |
697 | ||
698 | /* Add group descriptor data to an existing or new group descriptor block. | |
699 | * Ensure we handle all possible error conditions _before_ we start modifying | |
700 | * the filesystem, because we cannot abort the transaction and not have it | |
701 | * write the data to disk. | |
702 | * | |
703 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
704 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
705 | * | |
706 | * We only need to hold the superblock lock while we are actually adding | |
707 | * in the new group's counts to the superblock. Prior to that we have | |
708 | * not really "added" the group at all. We re-check that we are still | |
709 | * adding in the last group in case things have changed since verifying. | |
710 | */ | |
711 | int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input) | |
712 | { | |
713 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
714 | struct ext3_super_block *es = sbi->s_es; | |
715 | int reserved_gdb = ext3_bg_has_super(sb, input->group) ? | |
716 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
717 | struct buffer_head *primary = NULL; | |
718 | struct ext3_group_desc *gdp; | |
719 | struct inode *inode = NULL; | |
720 | handle_t *handle; | |
721 | int gdb_off, gdb_num; | |
722 | int err, err2; | |
723 | ||
724 | gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb); | |
725 | gdb_off = input->group % EXT3_DESC_PER_BLOCK(sb); | |
726 | ||
727 | if (gdb_off == 0 && !EXT3_HAS_RO_COMPAT_FEATURE(sb, | |
728 | EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
729 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 730 | "Can't resize non-sparse filesystem further"); |
1da177e4 LT |
731 | return -EPERM; |
732 | } | |
733 | ||
734 | if (reserved_gdb || gdb_off == 0) { | |
735 | if (!EXT3_HAS_COMPAT_FEATURE(sb, | |
736 | EXT3_FEATURE_COMPAT_RESIZE_INODE)){ | |
737 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 738 | "No reserved GDT blocks, can't resize"); |
1da177e4 LT |
739 | return -EPERM; |
740 | } | |
741 | inode = iget(sb, EXT3_RESIZE_INO); | |
742 | if (!inode || is_bad_inode(inode)) { | |
743 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 744 | "Error opening resize inode"); |
1da177e4 LT |
745 | iput(inode); |
746 | return -ENOENT; | |
747 | } | |
748 | } | |
749 | ||
750 | if ((err = verify_group_input(sb, input))) | |
751 | goto exit_put; | |
752 | ||
753 | if ((err = setup_new_group_blocks(sb, input))) | |
754 | goto exit_put; | |
755 | ||
756 | /* | |
757 | * We will always be modifying at least the superblock and a GDT | |
758 | * block. If we are adding a group past the last current GDT block, | |
759 | * we will also modify the inode and the dindirect block. If we | |
760 | * are adding a group with superblock/GDT backups we will also | |
761 | * modify each of the reserved GDT dindirect blocks. | |
762 | */ | |
763 | handle = ext3_journal_start_sb(sb, | |
764 | ext3_bg_has_super(sb, input->group) ? | |
765 | 3 + reserved_gdb : 4); | |
766 | if (IS_ERR(handle)) { | |
767 | err = PTR_ERR(handle); | |
768 | goto exit_put; | |
769 | } | |
770 | ||
771 | lock_super(sb); | |
29ba1723 | 772 | if (input->group != sbi->s_groups_count) { |
1da177e4 | 773 | ext3_warning(sb, __FUNCTION__, |
9f40668d | 774 | "multiple resizers run on filesystem!"); |
aa877b3d | 775 | err = -EBUSY; |
1da177e4 LT |
776 | goto exit_journal; |
777 | } | |
778 | ||
779 | if ((err = ext3_journal_get_write_access(handle, sbi->s_sbh))) | |
780 | goto exit_journal; | |
781 | ||
782 | /* | |
783 | * We will only either add reserved group blocks to a backup group | |
784 | * or remove reserved blocks for the first group in a new group block. | |
785 | * Doing both would be mean more complex code, and sane people don't | |
786 | * use non-sparse filesystems anymore. This is already checked above. | |
787 | */ | |
788 | if (gdb_off) { | |
789 | primary = sbi->s_group_desc[gdb_num]; | |
790 | if ((err = ext3_journal_get_write_access(handle, primary))) | |
791 | goto exit_journal; | |
792 | ||
793 | if (reserved_gdb && ext3_bg_num_gdb(sb, input->group) && | |
794 | (err = reserve_backup_gdb(handle, inode, input))) | |
795 | goto exit_journal; | |
796 | } else if ((err = add_new_gdb(handle, inode, input, &primary))) | |
797 | goto exit_journal; | |
798 | ||
799 | /* | |
800 | * OK, now we've set up the new group. Time to make it active. | |
801 | * | |
802 | * Current kernels don't lock all allocations via lock_super(), | |
803 | * so we have to be safe wrt. concurrent accesses the group | |
804 | * data. So we need to be careful to set all of the relevant | |
805 | * group descriptor data etc. *before* we enable the group. | |
806 | * | |
29ba1723 | 807 | * The key field here is sbi->s_groups_count: as long as |
1da177e4 LT |
808 | * that retains its old value, nobody is going to access the new |
809 | * group. | |
810 | * | |
811 | * So first we update all the descriptor metadata for the new | |
812 | * group; then we update the total disk blocks count; then we | |
813 | * update the groups count to enable the group; then finally we | |
814 | * update the free space counts so that the system can start | |
815 | * using the new disk blocks. | |
816 | */ | |
817 | ||
818 | /* Update group descriptor block for new group */ | |
819 | gdp = (struct ext3_group_desc *)primary->b_data + gdb_off; | |
820 | ||
821 | gdp->bg_block_bitmap = cpu_to_le32(input->block_bitmap); | |
822 | gdp->bg_inode_bitmap = cpu_to_le32(input->inode_bitmap); | |
823 | gdp->bg_inode_table = cpu_to_le32(input->inode_table); | |
824 | gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count); | |
825 | gdp->bg_free_inodes_count = cpu_to_le16(EXT3_INODES_PER_GROUP(sb)); | |
826 | ||
827 | /* | |
828 | * Make the new blocks and inodes valid next. We do this before | |
829 | * increasing the group count so that once the group is enabled, | |
830 | * all of its blocks and inodes are already valid. | |
831 | * | |
832 | * We always allocate group-by-group, then block-by-block or | |
833 | * inode-by-inode within a group, so enabling these | |
834 | * blocks/inodes before the group is live won't actually let us | |
835 | * allocate the new space yet. | |
836 | */ | |
837 | es->s_blocks_count = cpu_to_le32(le32_to_cpu(es->s_blocks_count) + | |
838 | input->blocks_count); | |
839 | es->s_inodes_count = cpu_to_le32(le32_to_cpu(es->s_inodes_count) + | |
840 | EXT3_INODES_PER_GROUP(sb)); | |
841 | ||
842 | /* | |
843 | * We need to protect s_groups_count against other CPUs seeing | |
844 | * inconsistent state in the superblock. | |
845 | * | |
846 | * The precise rules we use are: | |
847 | * | |
848 | * * Writers of s_groups_count *must* hold lock_super | |
849 | * AND | |
850 | * * Writers must perform a smp_wmb() after updating all dependent | |
851 | * data and before modifying the groups count | |
852 | * | |
853 | * * Readers must hold lock_super() over the access | |
854 | * OR | |
855 | * * Readers must perform an smp_rmb() after reading the groups count | |
856 | * and before reading any dependent data. | |
857 | * | |
858 | * NB. These rules can be relaxed when checking the group count | |
859 | * while freeing data, as we can only allocate from a block | |
860 | * group after serialising against the group count, and we can | |
861 | * only then free after serialising in turn against that | |
862 | * allocation. | |
863 | */ | |
864 | smp_wmb(); | |
865 | ||
866 | /* Update the global fs size fields */ | |
29ba1723 | 867 | sbi->s_groups_count++; |
1da177e4 LT |
868 | |
869 | ext3_journal_dirty_metadata(handle, primary); | |
870 | ||
871 | /* Update the reserved block counts only once the new group is | |
872 | * active. */ | |
873 | es->s_r_blocks_count = cpu_to_le32(le32_to_cpu(es->s_r_blocks_count) + | |
874 | input->reserved_blocks); | |
875 | ||
876 | /* Update the free space counts */ | |
877 | percpu_counter_mod(&sbi->s_freeblocks_counter, | |
878 | input->free_blocks_count); | |
879 | percpu_counter_mod(&sbi->s_freeinodes_counter, | |
880 | EXT3_INODES_PER_GROUP(sb)); | |
881 | ||
29ba1723 | 882 | ext3_journal_dirty_metadata(handle, sbi->s_sbh); |
1da177e4 LT |
883 | sb->s_dirt = 1; |
884 | ||
885 | exit_journal: | |
886 | unlock_super(sb); | |
887 | if ((err2 = ext3_journal_stop(handle)) && !err) | |
888 | err = err2; | |
889 | if (!err) { | |
890 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, | |
891 | sizeof(struct ext3_super_block)); | |
892 | update_backups(sb, primary->b_blocknr, primary->b_data, | |
893 | primary->b_size); | |
894 | } | |
895 | exit_put: | |
896 | iput(inode); | |
897 | return err; | |
898 | } /* ext3_group_add */ | |
899 | ||
900 | /* Extend the filesystem to the new number of blocks specified. This entry | |
901 | * point is only used to extend the current filesystem to the end of the last | |
902 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
903 | * for emergencies (because it has no dependencies on reserved blocks). | |
904 | * | |
905 | * If we _really_ wanted, we could use default values to call ext3_group_add() | |
906 | * allow the "remount" trick to work for arbitrary resizing, assuming enough | |
907 | * GDT blocks are reserved to grow to the desired size. | |
908 | */ | |
909 | int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es, | |
43d23f90 | 910 | ext3_fsblk_t n_blocks_count) |
1da177e4 | 911 | { |
43d23f90 | 912 | ext3_fsblk_t o_blocks_count; |
1da177e4 | 913 | unsigned long o_groups_count; |
1c2bf374 MC |
914 | ext3_grpblk_t last; |
915 | ext3_grpblk_t add; | |
1da177e4 LT |
916 | struct buffer_head * bh; |
917 | handle_t *handle; | |
1c2bf374 MC |
918 | int err; |
919 | unsigned long freed_blocks; | |
1da177e4 LT |
920 | |
921 | /* We don't need to worry about locking wrt other resizers just | |
922 | * yet: we're going to revalidate es->s_blocks_count after | |
923 | * taking lock_super() below. */ | |
924 | o_blocks_count = le32_to_cpu(es->s_blocks_count); | |
925 | o_groups_count = EXT3_SB(sb)->s_groups_count; | |
926 | ||
927 | if (test_opt(sb, DEBUG)) | |
43d23f90 | 928 | printk(KERN_DEBUG "EXT3-fs: extending last group from "E3FSBLK" uto "E3FSBLK" blocks\n", |
1da177e4 LT |
929 | o_blocks_count, n_blocks_count); |
930 | ||
931 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
932 | return 0; | |
933 | ||
fcd5df35 MC |
934 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
935 | printk(KERN_ERR "EXT3-fs: filesystem on %s:" | |
936 | " too large to resize to %lu blocks safely\n", | |
937 | sb->s_id, n_blocks_count); | |
938 | if (sizeof(sector_t) < 8) | |
939 | ext3_warning(sb, __FUNCTION__, | |
940 | "CONFIG_LBD not enabled\n"); | |
941 | return -EINVAL; | |
942 | } | |
943 | ||
1da177e4 LT |
944 | if (n_blocks_count < o_blocks_count) { |
945 | ext3_warning(sb, __FUNCTION__, | |
946 | "can't shrink FS - resize aborted"); | |
947 | return -EBUSY; | |
948 | } | |
949 | ||
950 | /* Handle the remaining blocks in the last group only. */ | |
951 | last = (o_blocks_count - le32_to_cpu(es->s_first_data_block)) % | |
952 | EXT3_BLOCKS_PER_GROUP(sb); | |
953 | ||
954 | if (last == 0) { | |
955 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 956 | "need to use ext2online to resize further"); |
1da177e4 LT |
957 | return -EPERM; |
958 | } | |
959 | ||
960 | add = EXT3_BLOCKS_PER_GROUP(sb) - last; | |
961 | ||
962 | if (o_blocks_count + add > n_blocks_count) | |
963 | add = n_blocks_count - o_blocks_count; | |
964 | ||
965 | if (o_blocks_count + add < n_blocks_count) | |
966 | ext3_warning(sb, __FUNCTION__, | |
43d23f90 MC |
967 | "will only finish group ("E3FSBLK |
968 | " blocks, %u new)", | |
1da177e4 LT |
969 | o_blocks_count + add, add); |
970 | ||
971 | /* See if the device is actually as big as what was requested */ | |
972 | bh = sb_bread(sb, o_blocks_count + add -1); | |
973 | if (!bh) { | |
974 | ext3_warning(sb, __FUNCTION__, | |
975 | "can't read last block, resize aborted"); | |
976 | return -ENOSPC; | |
977 | } | |
978 | brelse(bh); | |
979 | ||
980 | /* We will update the superblock, one block bitmap, and | |
981 | * one group descriptor via ext3_free_blocks(). | |
982 | */ | |
983 | handle = ext3_journal_start_sb(sb, 3); | |
984 | if (IS_ERR(handle)) { | |
985 | err = PTR_ERR(handle); | |
986 | ext3_warning(sb, __FUNCTION__, "error %d on journal start",err); | |
987 | goto exit_put; | |
988 | } | |
989 | ||
990 | lock_super(sb); | |
991 | if (o_blocks_count != le32_to_cpu(es->s_blocks_count)) { | |
992 | ext3_warning(sb, __FUNCTION__, | |
9f40668d | 993 | "multiple resizers run on filesystem!"); |
389ed39b | 994 | unlock_super(sb); |
1da177e4 LT |
995 | err = -EBUSY; |
996 | goto exit_put; | |
997 | } | |
998 | ||
999 | if ((err = ext3_journal_get_write_access(handle, | |
1000 | EXT3_SB(sb)->s_sbh))) { | |
1001 | ext3_warning(sb, __FUNCTION__, | |
1002 | "error %d on journal write access", err); | |
1003 | unlock_super(sb); | |
1004 | ext3_journal_stop(handle); | |
1005 | goto exit_put; | |
1006 | } | |
1007 | es->s_blocks_count = cpu_to_le32(o_blocks_count + add); | |
1008 | ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh); | |
1009 | sb->s_dirt = 1; | |
1010 | unlock_super(sb); | |
43d23f90 | 1011 | ext3_debug("freeing blocks %lu through "E3FSBLK"\n", o_blocks_count, |
1da177e4 LT |
1012 | o_blocks_count + add); |
1013 | ext3_free_blocks_sb(handle, sb, o_blocks_count, add, &freed_blocks); | |
43d23f90 | 1014 | ext3_debug("freed blocks "E3FSBLK" through "E3FSBLK"\n", o_blocks_count, |
1da177e4 LT |
1015 | o_blocks_count + add); |
1016 | if ((err = ext3_journal_stop(handle))) | |
1017 | goto exit_put; | |
1018 | if (test_opt(sb, DEBUG)) | |
1019 | printk(KERN_DEBUG "EXT3-fs: extended group to %u blocks\n", | |
1020 | le32_to_cpu(es->s_blocks_count)); | |
1021 | update_backups(sb, EXT3_SB(sb)->s_sbh->b_blocknr, (char *)es, | |
1022 | sizeof(struct ext3_super_block)); | |
1023 | exit_put: | |
1024 | return err; | |
1025 | } /* ext3_group_extend */ |