Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/ialloc.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 1992, 1993, 1994, 1995 | |
6 | * Remy Card (card@masi.ibp.fr) | |
7 | * Laboratoire MASI - Institut Blaise Pascal | |
8 | * Universite Pierre et Marie Curie (Paris VI) | |
9 | * | |
10 | * BSD ufs-inspired inode and directory allocation by | |
11 | * Stephen Tweedie (sct@redhat.com), 1993 | |
12 | * Big-endian to little-endian byte-swapping/bitmaps by | |
13 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
14 | */ | |
15 | ||
16 | #include <linux/time.h> | |
17 | #include <linux/fs.h> | |
ac27a0ec DK |
18 | #include <linux/stat.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/quotaops.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/random.h> | |
23 | #include <linux/bitops.h> | |
3a5b2ecd | 24 | #include <linux/blkdev.h> |
5b825c3a IM |
25 | #include <linux/cred.h> |
26 | ||
ac27a0ec | 27 | #include <asm/byteorder.h> |
9bffad1e | 28 | |
3dcf5451 CH |
29 | #include "ext4.h" |
30 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
31 | #include "xattr.h" |
32 | #include "acl.h" | |
33 | ||
9bffad1e TT |
34 | #include <trace/events/ext4.h> |
35 | ||
ac27a0ec DK |
36 | /* |
37 | * ialloc.c contains the inodes allocation and deallocation routines | |
38 | */ | |
39 | ||
40 | /* | |
41 | * The free inodes are managed by bitmaps. A file system contains several | |
42 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap | |
43 | * block for inodes, N blocks for the inode table and data blocks. | |
44 | * | |
45 | * The file system contains group descriptors which are located after the | |
46 | * super block. Each descriptor contains the number of the bitmap block and | |
47 | * the free blocks count in the block. | |
48 | */ | |
49 | ||
717d50e4 AD |
50 | /* |
51 | * To avoid calling the atomic setbit hundreds or thousands of times, we only | |
52 | * need to use it within a single byte (to ensure we get endianness right). | |
53 | * We can use memset for the rest of the bitmap as there are no other users. | |
54 | */ | |
61d08673 | 55 | void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) |
717d50e4 AD |
56 | { |
57 | int i; | |
58 | ||
59 | if (start_bit >= end_bit) | |
60 | return; | |
61 | ||
62 | ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); | |
63 | for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) | |
64 | ext4_set_bit(i, bitmap); | |
65 | if (i < end_bit) | |
66 | memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); | |
67 | } | |
68 | ||
813e5727 TT |
69 | void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) |
70 | { | |
71 | if (uptodate) { | |
72 | set_buffer_uptodate(bh); | |
73 | set_bitmap_uptodate(bh); | |
74 | } | |
75 | unlock_buffer(bh); | |
76 | put_bh(bh); | |
77 | } | |
78 | ||
9008a58e DW |
79 | static int ext4_validate_inode_bitmap(struct super_block *sb, |
80 | struct ext4_group_desc *desc, | |
81 | ext4_group_t block_group, | |
82 | struct buffer_head *bh) | |
83 | { | |
84 | ext4_fsblk_t blk; | |
85 | struct ext4_group_info *grp = ext4_get_group_info(sb, block_group); | |
86 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
87 | ||
88 | if (buffer_verified(bh)) | |
89 | return 0; | |
90 | if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) | |
91 | return -EFSCORRUPTED; | |
92 | ||
93 | ext4_lock_group(sb, block_group); | |
94 | blk = ext4_inode_bitmap(sb, desc); | |
95 | if (!ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, | |
96 | EXT4_INODES_PER_GROUP(sb) / 8)) { | |
97 | ext4_unlock_group(sb, block_group); | |
98 | ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " | |
99 | "inode_bitmap = %llu", block_group, blk); | |
100 | grp = ext4_get_group_info(sb, block_group); | |
101 | if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { | |
102 | int count; | |
103 | count = ext4_free_inodes_count(sb, desc); | |
104 | percpu_counter_sub(&sbi->s_freeinodes_counter, | |
105 | count); | |
106 | } | |
107 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); | |
108 | return -EFSBADCRC; | |
109 | } | |
110 | set_buffer_verified(bh); | |
111 | ext4_unlock_group(sb, block_group); | |
112 | return 0; | |
113 | } | |
114 | ||
ac27a0ec DK |
115 | /* |
116 | * Read the inode allocation bitmap for a given block_group, reading | |
117 | * into the specified slot in the superblock's bitmap cache. | |
118 | * | |
119 | * Return buffer_head of bitmap on success or NULL. | |
120 | */ | |
121 | static struct buffer_head * | |
e29d1cde | 122 | ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) |
ac27a0ec | 123 | { |
617ba13b | 124 | struct ext4_group_desc *desc; |
7dac4a17 | 125 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec | 126 | struct buffer_head *bh = NULL; |
e29d1cde | 127 | ext4_fsblk_t bitmap_blk; |
9008a58e | 128 | int err; |
ac27a0ec | 129 | |
617ba13b | 130 | desc = ext4_get_group_desc(sb, block_group, NULL); |
ac27a0ec | 131 | if (!desc) |
9008a58e | 132 | return ERR_PTR(-EFSCORRUPTED); |
bfff6873 | 133 | |
e29d1cde | 134 | bitmap_blk = ext4_inode_bitmap(sb, desc); |
7dac4a17 TT |
135 | if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || |
136 | (bitmap_blk >= ext4_blocks_count(sbi->s_es))) { | |
137 | ext4_error(sb, "Invalid inode bitmap blk %llu in " | |
138 | "block_group %u", bitmap_blk, block_group); | |
139 | return ERR_PTR(-EFSCORRUPTED); | |
140 | } | |
e29d1cde ES |
141 | bh = sb_getblk(sb, bitmap_blk); |
142 | if (unlikely(!bh)) { | |
12062ddd | 143 | ext4_error(sb, "Cannot read inode bitmap - " |
a9df9a49 | 144 | "block_group = %u, inode_bitmap = %llu", |
e29d1cde | 145 | block_group, bitmap_blk); |
9008a58e | 146 | return ERR_PTR(-EIO); |
e29d1cde | 147 | } |
2ccb5fb9 | 148 | if (bitmap_uptodate(bh)) |
41a246d1 | 149 | goto verify; |
e29d1cde | 150 | |
c806e68f | 151 | lock_buffer(bh); |
2ccb5fb9 AK |
152 | if (bitmap_uptodate(bh)) { |
153 | unlock_buffer(bh); | |
41a246d1 | 154 | goto verify; |
2ccb5fb9 | 155 | } |
bfff6873 | 156 | |
955ce5f5 | 157 | ext4_lock_group(sb, block_group); |
717d50e4 | 158 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { |
044e6e3d TT |
159 | memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); |
160 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
161 | sb->s_blocksize * 8, bh->b_data); | |
2ccb5fb9 | 162 | set_bitmap_uptodate(bh); |
e29d1cde | 163 | set_buffer_uptodate(bh); |
41a246d1 | 164 | set_buffer_verified(bh); |
955ce5f5 | 165 | ext4_unlock_group(sb, block_group); |
3300beda | 166 | unlock_buffer(bh); |
e29d1cde | 167 | return bh; |
717d50e4 | 168 | } |
955ce5f5 | 169 | ext4_unlock_group(sb, block_group); |
bfff6873 | 170 | |
2ccb5fb9 AK |
171 | if (buffer_uptodate(bh)) { |
172 | /* | |
173 | * if not uninit if bh is uptodate, | |
174 | * bitmap is also uptodate | |
175 | */ | |
176 | set_bitmap_uptodate(bh); | |
177 | unlock_buffer(bh); | |
41a246d1 | 178 | goto verify; |
2ccb5fb9 AK |
179 | } |
180 | /* | |
813e5727 | 181 | * submit the buffer_head for reading |
2ccb5fb9 | 182 | */ |
0562e0ba | 183 | trace_ext4_load_inode_bitmap(sb, block_group); |
813e5727 TT |
184 | bh->b_end_io = ext4_end_bitmap_read; |
185 | get_bh(bh); | |
2a222ca9 | 186 | submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh); |
813e5727 TT |
187 | wait_on_buffer(bh); |
188 | if (!buffer_uptodate(bh)) { | |
e29d1cde | 189 | put_bh(bh); |
12062ddd | 190 | ext4_error(sb, "Cannot read inode bitmap - " |
813e5727 TT |
191 | "block_group = %u, inode_bitmap = %llu", |
192 | block_group, bitmap_blk); | |
9008a58e | 193 | return ERR_PTR(-EIO); |
e29d1cde | 194 | } |
41a246d1 DW |
195 | |
196 | verify: | |
9008a58e DW |
197 | err = ext4_validate_inode_bitmap(sb, desc, block_group, bh); |
198 | if (err) | |
199 | goto out; | |
ac27a0ec | 200 | return bh; |
9008a58e DW |
201 | out: |
202 | put_bh(bh); | |
203 | return ERR_PTR(err); | |
ac27a0ec DK |
204 | } |
205 | ||
206 | /* | |
207 | * NOTE! When we get the inode, we're the only people | |
208 | * that have access to it, and as such there are no | |
209 | * race conditions we have to worry about. The inode | |
210 | * is not on the hash-lists, and it cannot be reached | |
211 | * through the filesystem because the directory entry | |
212 | * has been deleted earlier. | |
213 | * | |
214 | * HOWEVER: we must make sure that we get no aliases, | |
215 | * which means that we have to call "clear_inode()" | |
216 | * _before_ we mark the inode not in use in the inode | |
217 | * bitmaps. Otherwise a newly created file might use | |
218 | * the same inode number (not actually the same pointer | |
219 | * though), and then we'd have two inodes sharing the | |
220 | * same inode number and space on the harddisk. | |
221 | */ | |
af5bc92d | 222 | void ext4_free_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 223 | { |
af5bc92d | 224 | struct super_block *sb = inode->i_sb; |
ac27a0ec DK |
225 | int is_directory; |
226 | unsigned long ino; | |
227 | struct buffer_head *bitmap_bh = NULL; | |
228 | struct buffer_head *bh2; | |
fd2d4291 | 229 | ext4_group_t block_group; |
ac27a0ec | 230 | unsigned long bit; |
af5bc92d TT |
231 | struct ext4_group_desc *gdp; |
232 | struct ext4_super_block *es; | |
617ba13b | 233 | struct ext4_sb_info *sbi; |
7ce9d5d1 | 234 | int fatal = 0, err, count, cleared; |
87a39389 | 235 | struct ext4_group_info *grp; |
ac27a0ec | 236 | |
92b97816 TT |
237 | if (!sb) { |
238 | printk(KERN_ERR "EXT4-fs: %s:%d: inode on " | |
239 | "nonexistent device\n", __func__, __LINE__); | |
ac27a0ec DK |
240 | return; |
241 | } | |
92b97816 TT |
242 | if (atomic_read(&inode->i_count) > 1) { |
243 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", | |
244 | __func__, __LINE__, inode->i_ino, | |
245 | atomic_read(&inode->i_count)); | |
ac27a0ec DK |
246 | return; |
247 | } | |
92b97816 TT |
248 | if (inode->i_nlink) { |
249 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", | |
250 | __func__, __LINE__, inode->i_ino, inode->i_nlink); | |
ac27a0ec DK |
251 | return; |
252 | } | |
617ba13b | 253 | sbi = EXT4_SB(sb); |
ac27a0ec DK |
254 | |
255 | ino = inode->i_ino; | |
af5bc92d | 256 | ext4_debug("freeing inode %lu\n", ino); |
9bffad1e | 257 | trace_ext4_free_inode(inode); |
ac27a0ec DK |
258 | |
259 | /* | |
260 | * Note: we must free any quota before locking the superblock, | |
261 | * as writing the quota to disk may need the lock as well. | |
262 | */ | |
871a2931 | 263 | dquot_initialize(inode); |
63936dda | 264 | dquot_free_inode(inode); |
9f754758 | 265 | dquot_drop(inode); |
ac27a0ec DK |
266 | |
267 | is_directory = S_ISDIR(inode->i_mode); | |
268 | ||
269 | /* Do this BEFORE marking the inode not in use or returning an error */ | |
0930fcc1 | 270 | ext4_clear_inode(inode); |
ac27a0ec | 271 | |
49598e04 | 272 | es = sbi->s_es; |
617ba13b | 273 | if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 274 | ext4_error(sb, "reserved or nonexistent inode %lu", ino); |
ac27a0ec DK |
275 | goto error_return; |
276 | } | |
617ba13b MC |
277 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
278 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); | |
e29d1cde | 279 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
87a39389 DW |
280 | /* Don't bother if the inode bitmap is corrupt. */ |
281 | grp = ext4_get_group_info(sb, block_group); | |
9008a58e DW |
282 | if (IS_ERR(bitmap_bh)) { |
283 | fatal = PTR_ERR(bitmap_bh); | |
284 | bitmap_bh = NULL; | |
285 | goto error_return; | |
286 | } | |
287 | if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp))) { | |
288 | fatal = -EFSCORRUPTED; | |
ac27a0ec | 289 | goto error_return; |
9008a58e | 290 | } |
ac27a0ec DK |
291 | |
292 | BUFFER_TRACE(bitmap_bh, "get_write_access"); | |
617ba13b | 293 | fatal = ext4_journal_get_write_access(handle, bitmap_bh); |
ac27a0ec DK |
294 | if (fatal) |
295 | goto error_return; | |
296 | ||
d17413c0 DM |
297 | fatal = -ESRCH; |
298 | gdp = ext4_get_group_desc(sb, block_group, &bh2); | |
299 | if (gdp) { | |
ac27a0ec | 300 | BUFFER_TRACE(bh2, "get_write_access"); |
617ba13b | 301 | fatal = ext4_journal_get_write_access(handle, bh2); |
d17413c0 DM |
302 | } |
303 | ext4_lock_group(sb, block_group); | |
597d508c | 304 | cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); |
d17413c0 DM |
305 | if (fatal || !cleared) { |
306 | ext4_unlock_group(sb, block_group); | |
307 | goto out; | |
308 | } | |
7d39db14 | 309 | |
d17413c0 DM |
310 | count = ext4_free_inodes_count(sb, gdp) + 1; |
311 | ext4_free_inodes_set(sb, gdp, count); | |
312 | if (is_directory) { | |
313 | count = ext4_used_dirs_count(sb, gdp) - 1; | |
314 | ext4_used_dirs_set(sb, gdp, count); | |
315 | percpu_counter_dec(&sbi->s_dirs_counter); | |
ac27a0ec | 316 | } |
41a246d1 DW |
317 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, |
318 | EXT4_INODES_PER_GROUP(sb) / 8); | |
feb0ab32 | 319 | ext4_group_desc_csum_set(sb, block_group, gdp); |
d17413c0 | 320 | ext4_unlock_group(sb, block_group); |
ac27a0ec | 321 | |
d17413c0 DM |
322 | percpu_counter_inc(&sbi->s_freeinodes_counter); |
323 | if (sbi->s_log_groups_per_flex) { | |
324 | ext4_group_t f = ext4_flex_group(sbi, block_group); | |
9f24e420 | 325 | |
d17413c0 DM |
326 | atomic_inc(&sbi->s_flex_groups[f].free_inodes); |
327 | if (is_directory) | |
328 | atomic_dec(&sbi->s_flex_groups[f].used_dirs); | |
ac27a0ec | 329 | } |
d17413c0 DM |
330 | BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); |
331 | fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); | |
332 | out: | |
333 | if (cleared) { | |
334 | BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); | |
335 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); | |
336 | if (!fatal) | |
337 | fatal = err; | |
87a39389 | 338 | } else { |
d17413c0 | 339 | ext4_error(sb, "bit already cleared for inode %lu", ino); |
bf40c926 | 340 | if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { |
e43bb4e6 NJ |
341 | int count; |
342 | count = ext4_free_inodes_count(sb, gdp); | |
343 | percpu_counter_sub(&sbi->s_freeinodes_counter, | |
344 | count); | |
345 | } | |
87a39389 DW |
346 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); |
347 | } | |
d17413c0 | 348 | |
ac27a0ec DK |
349 | error_return: |
350 | brelse(bitmap_bh); | |
617ba13b | 351 | ext4_std_error(sb, fatal); |
ac27a0ec DK |
352 | } |
353 | ||
a4912123 | 354 | struct orlov_stats { |
90ba983f | 355 | __u64 free_clusters; |
a4912123 | 356 | __u32 free_inodes; |
a4912123 TT |
357 | __u32 used_dirs; |
358 | }; | |
359 | ||
360 | /* | |
361 | * Helper function for Orlov's allocator; returns critical information | |
362 | * for a particular block group or flex_bg. If flex_size is 1, then g | |
363 | * is a block group number; otherwise it is flex_bg number. | |
364 | */ | |
1f109d5a TT |
365 | static void get_orlov_stats(struct super_block *sb, ext4_group_t g, |
366 | int flex_size, struct orlov_stats *stats) | |
a4912123 TT |
367 | { |
368 | struct ext4_group_desc *desc; | |
7d39db14 | 369 | struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; |
a4912123 | 370 | |
7d39db14 TT |
371 | if (flex_size > 1) { |
372 | stats->free_inodes = atomic_read(&flex_group[g].free_inodes); | |
90ba983f | 373 | stats->free_clusters = atomic64_read(&flex_group[g].free_clusters); |
7d39db14 TT |
374 | stats->used_dirs = atomic_read(&flex_group[g].used_dirs); |
375 | return; | |
376 | } | |
a4912123 | 377 | |
7d39db14 TT |
378 | desc = ext4_get_group_desc(sb, g, NULL); |
379 | if (desc) { | |
380 | stats->free_inodes = ext4_free_inodes_count(sb, desc); | |
021b65bb | 381 | stats->free_clusters = ext4_free_group_clusters(sb, desc); |
7d39db14 TT |
382 | stats->used_dirs = ext4_used_dirs_count(sb, desc); |
383 | } else { | |
384 | stats->free_inodes = 0; | |
24aaa8ef | 385 | stats->free_clusters = 0; |
7d39db14 | 386 | stats->used_dirs = 0; |
a4912123 TT |
387 | } |
388 | } | |
389 | ||
ac27a0ec DK |
390 | /* |
391 | * Orlov's allocator for directories. | |
392 | * | |
393 | * We always try to spread first-level directories. | |
394 | * | |
395 | * If there are blockgroups with both free inodes and free blocks counts | |
396 | * not worse than average we return one with smallest directory count. | |
397 | * Otherwise we simply return a random group. | |
398 | * | |
399 | * For the rest rules look so: | |
400 | * | |
401 | * It's OK to put directory into a group unless | |
402 | * it has too many directories already (max_dirs) or | |
403 | * it has too few free inodes left (min_inodes) or | |
404 | * it has too few free blocks left (min_blocks) or | |
1cc8dcf5 | 405 | * Parent's group is preferred, if it doesn't satisfy these |
ac27a0ec DK |
406 | * conditions we search cyclically through the rest. If none |
407 | * of the groups look good we just look for a group with more | |
408 | * free inodes than average (starting at parent's group). | |
ac27a0ec DK |
409 | */ |
410 | ||
2aa9fc4c | 411 | static int find_group_orlov(struct super_block *sb, struct inode *parent, |
dcca3fec | 412 | ext4_group_t *group, umode_t mode, |
f157a4aa | 413 | const struct qstr *qstr) |
ac27a0ec | 414 | { |
fd2d4291 | 415 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
617ba13b | 416 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
8df9675f | 417 | ext4_group_t real_ngroups = ext4_get_groups_count(sb); |
617ba13b | 418 | int inodes_per_group = EXT4_INODES_PER_GROUP(sb); |
14c83c9f | 419 | unsigned int freei, avefreei, grp_free; |
24aaa8ef | 420 | ext4_fsblk_t freeb, avefreec; |
ac27a0ec | 421 | unsigned int ndirs; |
a4912123 | 422 | int max_dirs, min_inodes; |
24aaa8ef | 423 | ext4_grpblk_t min_clusters; |
8df9675f | 424 | ext4_group_t i, grp, g, ngroups; |
617ba13b | 425 | struct ext4_group_desc *desc; |
a4912123 TT |
426 | struct orlov_stats stats; |
427 | int flex_size = ext4_flex_bg_size(sbi); | |
f157a4aa | 428 | struct dx_hash_info hinfo; |
a4912123 | 429 | |
8df9675f | 430 | ngroups = real_ngroups; |
a4912123 | 431 | if (flex_size > 1) { |
8df9675f | 432 | ngroups = (real_ngroups + flex_size - 1) >> |
a4912123 TT |
433 | sbi->s_log_groups_per_flex; |
434 | parent_group >>= sbi->s_log_groups_per_flex; | |
435 | } | |
ac27a0ec DK |
436 | |
437 | freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); | |
438 | avefreei = freei / ngroups; | |
57042651 TT |
439 | freeb = EXT4_C2B(sbi, |
440 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); | |
24aaa8ef TT |
441 | avefreec = freeb; |
442 | do_div(avefreec, ngroups); | |
ac27a0ec DK |
443 | ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); |
444 | ||
a4912123 | 445 | if (S_ISDIR(mode) && |
2b0143b5 | 446 | ((parent == d_inode(sb->s_root)) || |
12e9b892 | 447 | (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { |
ac27a0ec | 448 | int best_ndir = inodes_per_group; |
2aa9fc4c | 449 | int ret = -1; |
ac27a0ec | 450 | |
f157a4aa TT |
451 | if (qstr) { |
452 | hinfo.hash_version = DX_HASH_HALF_MD4; | |
453 | hinfo.seed = sbi->s_hash_seed; | |
454 | ext4fs_dirhash(qstr->name, qstr->len, &hinfo); | |
455 | grp = hinfo.hash; | |
456 | } else | |
dd1f723b | 457 | grp = prandom_u32(); |
2aa9fc4c | 458 | parent_group = (unsigned)grp % ngroups; |
ac27a0ec | 459 | for (i = 0; i < ngroups; i++) { |
a4912123 TT |
460 | g = (parent_group + i) % ngroups; |
461 | get_orlov_stats(sb, g, flex_size, &stats); | |
462 | if (!stats.free_inodes) | |
ac27a0ec | 463 | continue; |
a4912123 | 464 | if (stats.used_dirs >= best_ndir) |
ac27a0ec | 465 | continue; |
a4912123 | 466 | if (stats.free_inodes < avefreei) |
ac27a0ec | 467 | continue; |
24aaa8ef | 468 | if (stats.free_clusters < avefreec) |
ac27a0ec | 469 | continue; |
a4912123 | 470 | grp = g; |
2aa9fc4c | 471 | ret = 0; |
a4912123 TT |
472 | best_ndir = stats.used_dirs; |
473 | } | |
474 | if (ret) | |
475 | goto fallback; | |
476 | found_flex_bg: | |
477 | if (flex_size == 1) { | |
478 | *group = grp; | |
479 | return 0; | |
480 | } | |
481 | ||
482 | /* | |
483 | * We pack inodes at the beginning of the flexgroup's | |
484 | * inode tables. Block allocation decisions will do | |
485 | * something similar, although regular files will | |
486 | * start at 2nd block group of the flexgroup. See | |
487 | * ext4_ext_find_goal() and ext4_find_near(). | |
488 | */ | |
489 | grp *= flex_size; | |
490 | for (i = 0; i < flex_size; i++) { | |
8df9675f | 491 | if (grp+i >= real_ngroups) |
a4912123 TT |
492 | break; |
493 | desc = ext4_get_group_desc(sb, grp+i, NULL); | |
494 | if (desc && ext4_free_inodes_count(sb, desc)) { | |
495 | *group = grp+i; | |
496 | return 0; | |
497 | } | |
ac27a0ec | 498 | } |
ac27a0ec DK |
499 | goto fallback; |
500 | } | |
501 | ||
ac27a0ec | 502 | max_dirs = ndirs / ngroups + inodes_per_group / 16; |
a4912123 TT |
503 | min_inodes = avefreei - inodes_per_group*flex_size / 4; |
504 | if (min_inodes < 1) | |
505 | min_inodes = 1; | |
24aaa8ef | 506 | min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; |
a4912123 TT |
507 | |
508 | /* | |
509 | * Start looking in the flex group where we last allocated an | |
510 | * inode for this parent directory | |
511 | */ | |
512 | if (EXT4_I(parent)->i_last_alloc_group != ~0) { | |
513 | parent_group = EXT4_I(parent)->i_last_alloc_group; | |
514 | if (flex_size > 1) | |
515 | parent_group >>= sbi->s_log_groups_per_flex; | |
516 | } | |
ac27a0ec DK |
517 | |
518 | for (i = 0; i < ngroups; i++) { | |
a4912123 TT |
519 | grp = (parent_group + i) % ngroups; |
520 | get_orlov_stats(sb, grp, flex_size, &stats); | |
521 | if (stats.used_dirs >= max_dirs) | |
ac27a0ec | 522 | continue; |
a4912123 | 523 | if (stats.free_inodes < min_inodes) |
ac27a0ec | 524 | continue; |
24aaa8ef | 525 | if (stats.free_clusters < min_clusters) |
ac27a0ec | 526 | continue; |
a4912123 | 527 | goto found_flex_bg; |
ac27a0ec DK |
528 | } |
529 | ||
530 | fallback: | |
8df9675f | 531 | ngroups = real_ngroups; |
a4912123 | 532 | avefreei = freei / ngroups; |
b5451f7b | 533 | fallback_retry: |
a4912123 | 534 | parent_group = EXT4_I(parent)->i_block_group; |
ac27a0ec | 535 | for (i = 0; i < ngroups; i++) { |
a4912123 TT |
536 | grp = (parent_group + i) % ngroups; |
537 | desc = ext4_get_group_desc(sb, grp, NULL); | |
bb3d132a DC |
538 | if (desc) { |
539 | grp_free = ext4_free_inodes_count(sb, desc); | |
540 | if (grp_free && grp_free >= avefreei) { | |
541 | *group = grp; | |
542 | return 0; | |
543 | } | |
a4912123 | 544 | } |
ac27a0ec DK |
545 | } |
546 | ||
547 | if (avefreei) { | |
548 | /* | |
549 | * The free-inodes counter is approximate, and for really small | |
550 | * filesystems the above test can fail to find any blockgroups | |
551 | */ | |
552 | avefreei = 0; | |
b5451f7b | 553 | goto fallback_retry; |
ac27a0ec DK |
554 | } |
555 | ||
556 | return -1; | |
557 | } | |
558 | ||
2aa9fc4c | 559 | static int find_group_other(struct super_block *sb, struct inode *parent, |
dcca3fec | 560 | ext4_group_t *group, umode_t mode) |
ac27a0ec | 561 | { |
fd2d4291 | 562 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
8df9675f | 563 | ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); |
617ba13b | 564 | struct ext4_group_desc *desc; |
a4912123 TT |
565 | int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); |
566 | ||
567 | /* | |
568 | * Try to place the inode is the same flex group as its | |
569 | * parent. If we can't find space, use the Orlov algorithm to | |
570 | * find another flex group, and store that information in the | |
571 | * parent directory's inode information so that use that flex | |
572 | * group for future allocations. | |
573 | */ | |
574 | if (flex_size > 1) { | |
575 | int retry = 0; | |
576 | ||
577 | try_again: | |
578 | parent_group &= ~(flex_size-1); | |
579 | last = parent_group + flex_size; | |
580 | if (last > ngroups) | |
581 | last = ngroups; | |
582 | for (i = parent_group; i < last; i++) { | |
583 | desc = ext4_get_group_desc(sb, i, NULL); | |
584 | if (desc && ext4_free_inodes_count(sb, desc)) { | |
585 | *group = i; | |
586 | return 0; | |
587 | } | |
588 | } | |
589 | if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { | |
590 | retry = 1; | |
591 | parent_group = EXT4_I(parent)->i_last_alloc_group; | |
592 | goto try_again; | |
593 | } | |
594 | /* | |
595 | * If this didn't work, use the Orlov search algorithm | |
596 | * to find a new flex group; we pass in the mode to | |
597 | * avoid the topdir algorithms. | |
598 | */ | |
599 | *group = parent_group + flex_size; | |
600 | if (*group > ngroups) | |
601 | *group = 0; | |
7dc57615 | 602 | return find_group_orlov(sb, parent, group, mode, NULL); |
a4912123 | 603 | } |
ac27a0ec DK |
604 | |
605 | /* | |
606 | * Try to place the inode in its parent directory | |
607 | */ | |
2aa9fc4c AM |
608 | *group = parent_group; |
609 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 610 | if (desc && ext4_free_inodes_count(sb, desc) && |
021b65bb | 611 | ext4_free_group_clusters(sb, desc)) |
2aa9fc4c | 612 | return 0; |
ac27a0ec DK |
613 | |
614 | /* | |
615 | * We're going to place this inode in a different blockgroup from its | |
616 | * parent. We want to cause files in a common directory to all land in | |
617 | * the same blockgroup. But we want files which are in a different | |
618 | * directory which shares a blockgroup with our parent to land in a | |
619 | * different blockgroup. | |
620 | * | |
621 | * So add our directory's i_ino into the starting point for the hash. | |
622 | */ | |
2aa9fc4c | 623 | *group = (*group + parent->i_ino) % ngroups; |
ac27a0ec DK |
624 | |
625 | /* | |
626 | * Use a quadratic hash to find a group with a free inode and some free | |
627 | * blocks. | |
628 | */ | |
629 | for (i = 1; i < ngroups; i <<= 1) { | |
2aa9fc4c AM |
630 | *group += i; |
631 | if (*group >= ngroups) | |
632 | *group -= ngroups; | |
633 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 634 | if (desc && ext4_free_inodes_count(sb, desc) && |
021b65bb | 635 | ext4_free_group_clusters(sb, desc)) |
2aa9fc4c | 636 | return 0; |
ac27a0ec DK |
637 | } |
638 | ||
639 | /* | |
640 | * That failed: try linear search for a free inode, even if that group | |
641 | * has no free blocks. | |
642 | */ | |
2aa9fc4c | 643 | *group = parent_group; |
ac27a0ec | 644 | for (i = 0; i < ngroups; i++) { |
2aa9fc4c AM |
645 | if (++*group >= ngroups) |
646 | *group = 0; | |
647 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 648 | if (desc && ext4_free_inodes_count(sb, desc)) |
2aa9fc4c | 649 | return 0; |
ac27a0ec DK |
650 | } |
651 | ||
652 | return -1; | |
653 | } | |
654 | ||
19883bd9 TT |
655 | /* |
656 | * In no journal mode, if an inode has recently been deleted, we want | |
657 | * to avoid reusing it until we're reasonably sure the inode table | |
658 | * block has been written back to disk. (Yes, these values are | |
659 | * somewhat arbitrary...) | |
660 | */ | |
661 | #define RECENTCY_MIN 5 | |
b5f51573 | 662 | #define RECENTCY_DIRTY 300 |
19883bd9 TT |
663 | |
664 | static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino) | |
665 | { | |
666 | struct ext4_group_desc *gdp; | |
667 | struct ext4_inode *raw_inode; | |
668 | struct buffer_head *bh; | |
b5f51573 AD |
669 | int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; |
670 | int offset, ret = 0; | |
671 | int recentcy = RECENTCY_MIN; | |
672 | u32 dtime, now; | |
19883bd9 TT |
673 | |
674 | gdp = ext4_get_group_desc(sb, group, NULL); | |
675 | if (unlikely(!gdp)) | |
676 | return 0; | |
677 | ||
4f9d956d | 678 | bh = sb_find_get_block(sb, ext4_inode_table(sb, gdp) + |
19883bd9 | 679 | (ino / inodes_per_block)); |
4f9d956d | 680 | if (!bh || !buffer_uptodate(bh)) |
19883bd9 TT |
681 | /* |
682 | * If the block is not in the buffer cache, then it | |
683 | * must have been written out. | |
684 | */ | |
685 | goto out; | |
686 | ||
687 | offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
688 | raw_inode = (struct ext4_inode *) (bh->b_data + offset); | |
b5f51573 AD |
689 | |
690 | /* i_dtime is only 32 bits on disk, but we only care about relative | |
691 | * times in the range of a few minutes (i.e. long enough to sync a | |
692 | * recently-deleted inode to disk), so using the low 32 bits of the | |
693 | * clock (a 68 year range) is enough, see time_before32() */ | |
19883bd9 | 694 | dtime = le32_to_cpu(raw_inode->i_dtime); |
b5f51573 | 695 | now = ktime_get_real_seconds(); |
19883bd9 TT |
696 | if (buffer_dirty(bh)) |
697 | recentcy += RECENTCY_DIRTY; | |
698 | ||
b5f51573 AD |
699 | if (dtime && time_before32(dtime, now) && |
700 | time_before32(now, dtime + recentcy)) | |
19883bd9 TT |
701 | ret = 1; |
702 | out: | |
703 | brelse(bh); | |
704 | return ret; | |
705 | } | |
706 | ||
901ed070 WS |
707 | static int find_inode_bit(struct super_block *sb, ext4_group_t group, |
708 | struct buffer_head *bitmap, unsigned long *ino) | |
709 | { | |
710 | next: | |
711 | *ino = ext4_find_next_zero_bit((unsigned long *) | |
712 | bitmap->b_data, | |
713 | EXT4_INODES_PER_GROUP(sb), *ino); | |
714 | if (*ino >= EXT4_INODES_PER_GROUP(sb)) | |
715 | return 0; | |
716 | ||
717 | if ((EXT4_SB(sb)->s_journal == NULL) && | |
718 | recently_deleted(sb, group, *ino)) { | |
719 | *ino = *ino + 1; | |
720 | if (*ino < EXT4_INODES_PER_GROUP(sb)) | |
721 | goto next; | |
722 | return 0; | |
723 | } | |
724 | ||
725 | return 1; | |
726 | } | |
727 | ||
ac27a0ec DK |
728 | /* |
729 | * There are two policies for allocating an inode. If the new inode is | |
730 | * a directory, then a forward search is made for a block group with both | |
731 | * free space and a low directory-to-inode ratio; if that fails, then of | |
732 | * the groups with above-average free space, that group with the fewest | |
733 | * directories already is chosen. | |
734 | * | |
735 | * For other inodes, search forward from the parent directory's block | |
736 | * group to find a free inode. | |
737 | */ | |
1139575a TT |
738 | struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, |
739 | umode_t mode, const struct qstr *qstr, | |
1b917ed8 TE |
740 | __u32 goal, uid_t *owner, __u32 i_flags, |
741 | int handle_type, unsigned int line_no, | |
742 | int nblocks) | |
ac27a0ec DK |
743 | { |
744 | struct super_block *sb; | |
3300beda AK |
745 | struct buffer_head *inode_bitmap_bh = NULL; |
746 | struct buffer_head *group_desc_bh; | |
8df9675f | 747 | ext4_group_t ngroups, group = 0; |
ac27a0ec | 748 | unsigned long ino = 0; |
af5bc92d TT |
749 | struct inode *inode; |
750 | struct ext4_group_desc *gdp = NULL; | |
617ba13b MC |
751 | struct ext4_inode_info *ei; |
752 | struct ext4_sb_info *sbi; | |
a7cdadee | 753 | int ret2, err; |
ac27a0ec | 754 | struct inode *ret; |
2aa9fc4c | 755 | ext4_group_t i; |
772cb7c8 | 756 | ext4_group_t flex_group; |
87a39389 | 757 | struct ext4_group_info *grp; |
e709e9df | 758 | int encrypt = 0; |
ac27a0ec DK |
759 | |
760 | /* Cannot create files in a deleted directory */ | |
761 | if (!dir || !dir->i_nlink) | |
762 | return ERR_PTR(-EPERM); | |
763 | ||
af65207c TE |
764 | sb = dir->i_sb; |
765 | sbi = EXT4_SB(sb); | |
766 | ||
767 | if (unlikely(ext4_forced_shutdown(sbi))) | |
0db1ff22 TT |
768 | return ERR_PTR(-EIO); |
769 | ||
af65207c | 770 | if ((ext4_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) && |
ad47f953 TE |
771 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) && |
772 | !(i_flags & EXT4_EA_INODE_FL)) { | |
a7550b30 | 773 | err = fscrypt_get_encryption_info(dir); |
e709e9df TT |
774 | if (err) |
775 | return ERR_PTR(err); | |
a7550b30 | 776 | if (!fscrypt_has_encryption_key(dir)) |
54475f53 | 777 | return ERR_PTR(-ENOKEY); |
e709e9df TT |
778 | encrypt = 1; |
779 | } | |
780 | ||
af65207c TE |
781 | if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) { |
782 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
783 | struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT); | |
784 | ||
996fc447 TT |
785 | if (IS_ERR(p)) |
786 | return ERR_CAST(p); | |
af65207c TE |
787 | if (p) { |
788 | int acl_size = p->a_count * sizeof(ext4_acl_entry); | |
789 | ||
790 | nblocks += (S_ISDIR(mode) ? 2 : 1) * | |
791 | __ext4_xattr_set_credits(sb, NULL /* inode */, | |
792 | NULL /* block_bh */, acl_size, | |
793 | true /* is_create */); | |
794 | posix_acl_release(p); | |
795 | } | |
796 | #endif | |
797 | ||
798 | #ifdef CONFIG_SECURITY | |
799 | { | |
800 | int num_security_xattrs = 1; | |
801 | ||
802 | #ifdef CONFIG_INTEGRITY | |
803 | num_security_xattrs++; | |
804 | #endif | |
805 | /* | |
806 | * We assume that security xattrs are never | |
807 | * more than 1k. In practice they are under | |
808 | * 128 bytes. | |
809 | */ | |
810 | nblocks += num_security_xattrs * | |
811 | __ext4_xattr_set_credits(sb, NULL /* inode */, | |
812 | NULL /* block_bh */, 1024, | |
813 | true /* is_create */); | |
814 | } | |
815 | #endif | |
816 | if (encrypt) | |
817 | nblocks += __ext4_xattr_set_credits(sb, | |
818 | NULL /* inode */, NULL /* block_bh */, | |
819 | FSCRYPT_SET_CONTEXT_MAX_SIZE, | |
820 | true /* is_create */); | |
821 | } | |
822 | ||
8df9675f | 823 | ngroups = ext4_get_groups_count(sb); |
9bffad1e | 824 | trace_ext4_request_inode(dir, mode); |
ac27a0ec DK |
825 | inode = new_inode(sb); |
826 | if (!inode) | |
827 | return ERR_PTR(-ENOMEM); | |
617ba13b | 828 | ei = EXT4_I(inode); |
772cb7c8 | 829 | |
eb9cc7e1 | 830 | /* |
b8a07463 | 831 | * Initialize owners and quota early so that we don't have to account |
eb9cc7e1 JK |
832 | * for quota initialization worst case in standard inode creating |
833 | * transaction | |
834 | */ | |
835 | if (owner) { | |
836 | inode->i_mode = mode; | |
837 | i_uid_write(inode, owner[0]); | |
838 | i_gid_write(inode, owner[1]); | |
839 | } else if (test_opt(sb, GRPID)) { | |
840 | inode->i_mode = mode; | |
841 | inode->i_uid = current_fsuid(); | |
842 | inode->i_gid = dir->i_gid; | |
843 | } else | |
844 | inode_init_owner(inode, dir, mode); | |
040cb378 | 845 | |
0b7b7779 | 846 | if (ext4_has_feature_project(sb) && |
040cb378 LX |
847 | ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) |
848 | ei->i_projid = EXT4_I(dir)->i_projid; | |
849 | else | |
850 | ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID); | |
851 | ||
a7cdadee JK |
852 | err = dquot_initialize(inode); |
853 | if (err) | |
854 | goto out; | |
eb9cc7e1 | 855 | |
11013911 AD |
856 | if (!goal) |
857 | goal = sbi->s_inode_goal; | |
858 | ||
e6462869 | 859 | if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { |
11013911 AD |
860 | group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); |
861 | ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); | |
862 | ret2 = 0; | |
863 | goto got_group; | |
864 | } | |
865 | ||
4113c4ca LC |
866 | if (S_ISDIR(mode)) |
867 | ret2 = find_group_orlov(sb, dir, &group, mode, qstr); | |
868 | else | |
a4912123 | 869 | ret2 = find_group_other(sb, dir, &group, mode); |
ac27a0ec | 870 | |
772cb7c8 | 871 | got_group: |
a4912123 | 872 | EXT4_I(dir)->i_last_alloc_group = group; |
ac27a0ec | 873 | err = -ENOSPC; |
2aa9fc4c | 874 | if (ret2 == -1) |
ac27a0ec DK |
875 | goto out; |
876 | ||
119c0d44 TT |
877 | /* |
878 | * Normally we will only go through one pass of this loop, | |
879 | * unless we get unlucky and it turns out the group we selected | |
880 | * had its last inode grabbed by someone else. | |
881 | */ | |
11013911 | 882 | for (i = 0; i < ngroups; i++, ino = 0) { |
ac27a0ec DK |
883 | err = -EIO; |
884 | ||
3300beda | 885 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); |
ac27a0ec | 886 | if (!gdp) |
eb9cc7e1 | 887 | goto out; |
ac27a0ec | 888 | |
f2a09af6 YY |
889 | /* |
890 | * Check free inodes count before loading bitmap. | |
891 | */ | |
2fe435d8 WS |
892 | if (ext4_free_inodes_count(sb, gdp) == 0) |
893 | goto next_group; | |
f2a09af6 | 894 | |
87a39389 DW |
895 | grp = ext4_get_group_info(sb, group); |
896 | /* Skip groups with already-known suspicious inode tables */ | |
2fe435d8 WS |
897 | if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) |
898 | goto next_group; | |
87a39389 | 899 | |
3300beda AK |
900 | brelse(inode_bitmap_bh); |
901 | inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); | |
87a39389 | 902 | /* Skip groups with suspicious inode tables */ |
9008a58e DW |
903 | if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) || |
904 | IS_ERR(inode_bitmap_bh)) { | |
905 | inode_bitmap_bh = NULL; | |
2fe435d8 | 906 | goto next_group; |
87a39389 | 907 | } |
ac27a0ec | 908 | |
ac27a0ec | 909 | repeat_in_this_group: |
901ed070 WS |
910 | ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino); |
911 | if (!ret2) | |
a34eb503 | 912 | goto next_group; |
901ed070 WS |
913 | |
914 | if (group == 0 && (ino + 1) < EXT4_FIRST_INO(sb)) { | |
119c0d44 TT |
915 | ext4_error(sb, "reserved inode found cleared - " |
916 | "inode=%lu", ino + 1); | |
2fe435d8 | 917 | goto next_group; |
119c0d44 | 918 | } |
901ed070 | 919 | |
1139575a TT |
920 | if (!handle) { |
921 | BUG_ON(nblocks <= 0); | |
922 | handle = __ext4_journal_start_sb(dir->i_sb, line_no, | |
5fe2fe89 JK |
923 | handle_type, nblocks, |
924 | 0); | |
1139575a TT |
925 | if (IS_ERR(handle)) { |
926 | err = PTR_ERR(handle); | |
eb9cc7e1 JK |
927 | ext4_std_error(sb, err); |
928 | goto out; | |
1139575a TT |
929 | } |
930 | } | |
ffb5387e ES |
931 | BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); |
932 | err = ext4_journal_get_write_access(handle, inode_bitmap_bh); | |
eb9cc7e1 JK |
933 | if (err) { |
934 | ext4_std_error(sb, err); | |
935 | goto out; | |
936 | } | |
119c0d44 TT |
937 | ext4_lock_group(sb, group); |
938 | ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); | |
901ed070 WS |
939 | if (ret2) { |
940 | /* Someone already took the bit. Repeat the search | |
941 | * with lock held. | |
942 | */ | |
943 | ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino); | |
944 | if (ret2) { | |
945 | ext4_set_bit(ino, inode_bitmap_bh->b_data); | |
946 | ret2 = 0; | |
947 | } else { | |
948 | ret2 = 1; /* we didn't grab the inode */ | |
949 | } | |
950 | } | |
119c0d44 TT |
951 | ext4_unlock_group(sb, group); |
952 | ino++; /* the inode bitmap is zero-based */ | |
953 | if (!ret2) | |
954 | goto got; /* we grabbed the inode! */ | |
901ed070 | 955 | |
119c0d44 TT |
956 | if (ino < EXT4_INODES_PER_GROUP(sb)) |
957 | goto repeat_in_this_group; | |
a34eb503 TT |
958 | next_group: |
959 | if (++group == ngroups) | |
960 | group = 0; | |
ac27a0ec DK |
961 | } |
962 | err = -ENOSPC; | |
963 | goto out; | |
964 | ||
965 | got: | |
ffb5387e ES |
966 | BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); |
967 | err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); | |
eb9cc7e1 JK |
968 | if (err) { |
969 | ext4_std_error(sb, err); | |
970 | goto out; | |
971 | } | |
ffb5387e | 972 | |
61c219f5 TT |
973 | BUFFER_TRACE(group_desc_bh, "get_write_access"); |
974 | err = ext4_journal_get_write_access(handle, group_desc_bh); | |
975 | if (err) { | |
976 | ext4_std_error(sb, err); | |
977 | goto out; | |
978 | } | |
979 | ||
717d50e4 | 980 | /* We may have to initialize the block bitmap if it isn't already */ |
feb0ab32 | 981 | if (ext4_has_group_desc_csum(sb) && |
717d50e4 | 982 | gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
3300beda | 983 | struct buffer_head *block_bitmap_bh; |
717d50e4 | 984 | |
3300beda | 985 | block_bitmap_bh = ext4_read_block_bitmap(sb, group); |
9008a58e DW |
986 | if (IS_ERR(block_bitmap_bh)) { |
987 | err = PTR_ERR(block_bitmap_bh); | |
599a9b77 JK |
988 | goto out; |
989 | } | |
3300beda AK |
990 | BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); |
991 | err = ext4_journal_get_write_access(handle, block_bitmap_bh); | |
717d50e4 | 992 | if (err) { |
3300beda | 993 | brelse(block_bitmap_bh); |
eb9cc7e1 JK |
994 | ext4_std_error(sb, err); |
995 | goto out; | |
717d50e4 AD |
996 | } |
997 | ||
fd034a84 TT |
998 | BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); |
999 | err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); | |
fd034a84 | 1000 | |
717d50e4 | 1001 | /* recheck and clear flag under lock if we still need to */ |
fd034a84 | 1002 | ext4_lock_group(sb, group); |
717d50e4 | 1003 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
3300beda | 1004 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); |
021b65bb | 1005 | ext4_free_group_clusters_set(sb, gdp, |
cff1dfd7 | 1006 | ext4_free_clusters_after_init(sb, group, gdp)); |
fa77dcfa | 1007 | ext4_block_bitmap_csum_set(sb, group, gdp, |
79f1ba49 | 1008 | block_bitmap_bh); |
feb0ab32 | 1009 | ext4_group_desc_csum_set(sb, group, gdp); |
717d50e4 | 1010 | } |
955ce5f5 | 1011 | ext4_unlock_group(sb, group); |
aeb1e5d6 | 1012 | brelse(block_bitmap_bh); |
717d50e4 | 1013 | |
eb9cc7e1 JK |
1014 | if (err) { |
1015 | ext4_std_error(sb, err); | |
1016 | goto out; | |
1017 | } | |
717d50e4 | 1018 | } |
119c0d44 | 1019 | |
119c0d44 | 1020 | /* Update the relevant bg descriptor fields */ |
41a246d1 | 1021 | if (ext4_has_group_desc_csum(sb)) { |
119c0d44 TT |
1022 | int free; |
1023 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
1024 | ||
1025 | down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ | |
1026 | ext4_lock_group(sb, group); /* while we modify the bg desc */ | |
1027 | free = EXT4_INODES_PER_GROUP(sb) - | |
1028 | ext4_itable_unused_count(sb, gdp); | |
1029 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { | |
1030 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); | |
1031 | free = 0; | |
1032 | } | |
1033 | /* | |
1034 | * Check the relative inode number against the last used | |
1035 | * relative inode number in this group. if it is greater | |
1036 | * we need to update the bg_itable_unused count | |
1037 | */ | |
1038 | if (ino > free) | |
1039 | ext4_itable_unused_set(sb, gdp, | |
1040 | (EXT4_INODES_PER_GROUP(sb) - ino)); | |
1041 | up_read(&grp->alloc_sem); | |
6f2e9f0e TM |
1042 | } else { |
1043 | ext4_lock_group(sb, group); | |
119c0d44 | 1044 | } |
6f2e9f0e | 1045 | |
119c0d44 TT |
1046 | ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); |
1047 | if (S_ISDIR(mode)) { | |
1048 | ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); | |
1049 | if (sbi->s_log_groups_per_flex) { | |
1050 | ext4_group_t f = ext4_flex_group(sbi, group); | |
1051 | ||
1052 | atomic_inc(&sbi->s_flex_groups[f].used_dirs); | |
1053 | } | |
1054 | } | |
41a246d1 DW |
1055 | if (ext4_has_group_desc_csum(sb)) { |
1056 | ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, | |
1057 | EXT4_INODES_PER_GROUP(sb) / 8); | |
feb0ab32 | 1058 | ext4_group_desc_csum_set(sb, group, gdp); |
119c0d44 | 1059 | } |
6f2e9f0e | 1060 | ext4_unlock_group(sb, group); |
119c0d44 | 1061 | |
3300beda AK |
1062 | BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); |
1063 | err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); | |
eb9cc7e1 JK |
1064 | if (err) { |
1065 | ext4_std_error(sb, err); | |
1066 | goto out; | |
1067 | } | |
ac27a0ec DK |
1068 | |
1069 | percpu_counter_dec(&sbi->s_freeinodes_counter); | |
1070 | if (S_ISDIR(mode)) | |
1071 | percpu_counter_inc(&sbi->s_dirs_counter); | |
ac27a0ec | 1072 | |
772cb7c8 JS |
1073 | if (sbi->s_log_groups_per_flex) { |
1074 | flex_group = ext4_flex_group(sbi, group); | |
9f24e420 | 1075 | atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); |
772cb7c8 | 1076 | } |
ac27a0ec | 1077 | |
717d50e4 | 1078 | inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); |
ac27a0ec DK |
1079 | /* This is the optimal IO size (for stat), not the fs block size */ |
1080 | inode->i_blocks = 0; | |
ef7f3835 | 1081 | inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = |
eeca7ea1 | 1082 | current_time(inode); |
ac27a0ec DK |
1083 | |
1084 | memset(ei->i_data, 0, sizeof(ei->i_data)); | |
1085 | ei->i_dir_start_lookup = 0; | |
1086 | ei->i_disksize = 0; | |
1087 | ||
4af83508 | 1088 | /* Don't inherit extent flag from directory, amongst others. */ |
2dc6b0d4 DG |
1089 | ei->i_flags = |
1090 | ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); | |
1b917ed8 | 1091 | ei->i_flags |= i_flags; |
ac27a0ec | 1092 | ei->i_file_acl = 0; |
ac27a0ec | 1093 | ei->i_dtime = 0; |
ac27a0ec | 1094 | ei->i_block_group = group; |
a4912123 | 1095 | ei->i_last_alloc_group = ~0; |
ac27a0ec | 1096 | |
617ba13b | 1097 | ext4_set_inode_flags(inode); |
ac27a0ec | 1098 | if (IS_DIRSYNC(inode)) |
0390131b | 1099 | ext4_handle_sync(handle); |
6b38e842 | 1100 | if (insert_inode_locked(inode) < 0) { |
acd6ad83 JK |
1101 | /* |
1102 | * Likely a bitmap corruption causing inode to be allocated | |
1103 | * twice. | |
1104 | */ | |
1105 | err = -EIO; | |
eb9cc7e1 JK |
1106 | ext4_error(sb, "failed to insert inode %lu: doubly allocated?", |
1107 | inode->i_ino); | |
1108 | goto out; | |
6b38e842 | 1109 | } |
23253068 | 1110 | inode->i_generation = prandom_u32(); |
ac27a0ec | 1111 | |
814525f4 | 1112 | /* Precompute checksum seed for inode metadata */ |
9aa5d32b | 1113 | if (ext4_has_metadata_csum(sb)) { |
814525f4 | 1114 | __u32 csum; |
814525f4 DW |
1115 | __le32 inum = cpu_to_le32(inode->i_ino); |
1116 | __le32 gen = cpu_to_le32(inode->i_generation); | |
1117 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, | |
1118 | sizeof(inum)); | |
1119 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, | |
1120 | sizeof(gen)); | |
1121 | } | |
1122 | ||
353eb83c | 1123 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
19f5fb7a | 1124 | ext4_set_inode_state(inode, EXT4_STATE_NEW); |
ef7f3835 | 1125 | |
49598e04 | 1126 | ei->i_extra_isize = sbi->s_want_extra_isize; |
f08225d1 | 1127 | ei->i_inline_off = 0; |
e2b911c5 | 1128 | if (ext4_has_feature_inline_data(sb)) |
f08225d1 | 1129 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
ac27a0ec | 1130 | ret = inode; |
63936dda CH |
1131 | err = dquot_alloc_inode(inode); |
1132 | if (err) | |
ac27a0ec | 1133 | goto fail_drop; |
ac27a0ec | 1134 | |
aa1dca3b EB |
1135 | /* |
1136 | * Since the encryption xattr will always be unique, create it first so | |
1137 | * that it's less likely to end up in an external xattr block and | |
1138 | * prevent its deduplication. | |
1139 | */ | |
1140 | if (encrypt) { | |
1141 | err = fscrypt_inherit_context(dir, inode, handle, true); | |
1142 | if (err) | |
1143 | goto fail_free_drop; | |
1144 | } | |
1145 | ||
1b917ed8 TE |
1146 | if (!(ei->i_flags & EXT4_EA_INODE_FL)) { |
1147 | err = ext4_init_acl(handle, inode, dir); | |
1148 | if (err) | |
1149 | goto fail_free_drop; | |
ac27a0ec | 1150 | |
ad47f953 TE |
1151 | err = ext4_init_security(handle, inode, dir, qstr); |
1152 | if (err) | |
1153 | goto fail_free_drop; | |
1154 | } | |
ac27a0ec | 1155 | |
e2b911c5 | 1156 | if (ext4_has_feature_extents(sb)) { |
e4079a11 | 1157 | /* set extent flag only for directory, file and normal symlink*/ |
e65187e6 | 1158 | if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { |
12e9b892 | 1159 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
42bf0383 | 1160 | ext4_ext_tree_init(handle, inode); |
42bf0383 | 1161 | } |
a86c6181 | 1162 | } |
ac27a0ec | 1163 | |
688f869c TT |
1164 | if (ext4_handle_valid(handle)) { |
1165 | ei->i_sync_tid = handle->h_transaction->t_tid; | |
1166 | ei->i_datasync_tid = handle->h_transaction->t_tid; | |
1167 | } | |
1168 | ||
8753e88f AK |
1169 | err = ext4_mark_inode_dirty(handle, inode); |
1170 | if (err) { | |
1171 | ext4_std_error(sb, err); | |
1172 | goto fail_free_drop; | |
1173 | } | |
1174 | ||
617ba13b | 1175 | ext4_debug("allocating inode %lu\n", inode->i_ino); |
9bffad1e | 1176 | trace_ext4_allocate_inode(inode, dir, mode); |
3300beda | 1177 | brelse(inode_bitmap_bh); |
ac27a0ec DK |
1178 | return ret; |
1179 | ||
1180 | fail_free_drop: | |
63936dda | 1181 | dquot_free_inode(inode); |
ac27a0ec | 1182 | fail_drop: |
6d6b77f1 | 1183 | clear_nlink(inode); |
6b38e842 | 1184 | unlock_new_inode(inode); |
eb9cc7e1 JK |
1185 | out: |
1186 | dquot_drop(inode); | |
1187 | inode->i_flags |= S_NOQUOTA; | |
ac27a0ec | 1188 | iput(inode); |
3300beda | 1189 | brelse(inode_bitmap_bh); |
ac27a0ec DK |
1190 | return ERR_PTR(err); |
1191 | } | |
1192 | ||
1193 | /* Verify that we are loading a valid orphan from disk */ | |
617ba13b | 1194 | struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1195 | { |
617ba13b | 1196 | unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); |
fd2d4291 | 1197 | ext4_group_t block_group; |
ac27a0ec | 1198 | int bit; |
7827a7f6 | 1199 | struct buffer_head *bitmap_bh = NULL; |
ac27a0ec | 1200 | struct inode *inode = NULL; |
7827a7f6 | 1201 | int err = -EFSCORRUPTED; |
ac27a0ec | 1202 | |
7827a7f6 TT |
1203 | if (ino < EXT4_FIRST_INO(sb) || ino > max_ino) |
1204 | goto bad_orphan; | |
ac27a0ec | 1205 | |
617ba13b MC |
1206 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
1207 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); | |
e29d1cde | 1208 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
9008a58e | 1209 | if (IS_ERR(bitmap_bh)) { |
7827a7f6 TT |
1210 | ext4_error(sb, "inode bitmap error %ld for orphan %lu", |
1211 | ino, PTR_ERR(bitmap_bh)); | |
1212 | return (struct inode *) bitmap_bh; | |
ac27a0ec DK |
1213 | } |
1214 | ||
1215 | /* Having the inode bit set should be a 100% indicator that this | |
1216 | * is a valid orphan (no e2fsck run on fs). Orphans also include | |
1217 | * inodes that were being truncated, so we can't check i_nlink==0. | |
1218 | */ | |
1d1fe1ee DH |
1219 | if (!ext4_test_bit(bit, bitmap_bh->b_data)) |
1220 | goto bad_orphan; | |
1221 | ||
1222 | inode = ext4_iget(sb, ino); | |
7827a7f6 TT |
1223 | if (IS_ERR(inode)) { |
1224 | err = PTR_ERR(inode); | |
1225 | ext4_error(sb, "couldn't read orphan inode %lu (err %d)", | |
1226 | ino, err); | |
1227 | return inode; | |
1228 | } | |
1d1fe1ee | 1229 | |
91ef4caf | 1230 | /* |
c9eb13a9 TT |
1231 | * If the orphans has i_nlinks > 0 then it should be able to |
1232 | * be truncated, otherwise it won't be removed from the orphan | |
1233 | * list during processing and an infinite loop will result. | |
1234 | * Similarly, it must not be a bad inode. | |
91ef4caf | 1235 | */ |
c9eb13a9 TT |
1236 | if ((inode->i_nlink && !ext4_can_truncate(inode)) || |
1237 | is_bad_inode(inode)) | |
91ef4caf DG |
1238 | goto bad_orphan; |
1239 | ||
1d1fe1ee DH |
1240 | if (NEXT_ORPHAN(inode) > max_ino) |
1241 | goto bad_orphan; | |
1242 | brelse(bitmap_bh); | |
1243 | return inode; | |
1244 | ||
1d1fe1ee | 1245 | bad_orphan: |
7827a7f6 TT |
1246 | ext4_error(sb, "bad orphan inode %lu", ino); |
1247 | if (bitmap_bh) | |
1248 | printk(KERN_ERR "ext4_test_bit(bit=%d, block=%llu) = %d\n", | |
1249 | bit, (unsigned long long)bitmap_bh->b_blocknr, | |
1250 | ext4_test_bit(bit, bitmap_bh->b_data)); | |
1d1fe1ee | 1251 | if (inode) { |
7827a7f6 | 1252 | printk(KERN_ERR "is_bad_inode(inode)=%d\n", |
1d1fe1ee | 1253 | is_bad_inode(inode)); |
7827a7f6 | 1254 | printk(KERN_ERR "NEXT_ORPHAN(inode)=%u\n", |
1d1fe1ee | 1255 | NEXT_ORPHAN(inode)); |
7827a7f6 TT |
1256 | printk(KERN_ERR "max_ino=%lu\n", max_ino); |
1257 | printk(KERN_ERR "i_nlink=%u\n", inode->i_nlink); | |
ac27a0ec | 1258 | /* Avoid freeing blocks if we got a bad deleted inode */ |
1d1fe1ee | 1259 | if (inode->i_nlink == 0) |
ac27a0ec DK |
1260 | inode->i_blocks = 0; |
1261 | iput(inode); | |
ac27a0ec | 1262 | } |
ac27a0ec | 1263 | brelse(bitmap_bh); |
1d1fe1ee | 1264 | return ERR_PTR(err); |
ac27a0ec DK |
1265 | } |
1266 | ||
af5bc92d | 1267 | unsigned long ext4_count_free_inodes(struct super_block *sb) |
ac27a0ec DK |
1268 | { |
1269 | unsigned long desc_count; | |
617ba13b | 1270 | struct ext4_group_desc *gdp; |
8df9675f | 1271 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
617ba13b MC |
1272 | #ifdef EXT4FS_DEBUG |
1273 | struct ext4_super_block *es; | |
ac27a0ec DK |
1274 | unsigned long bitmap_count, x; |
1275 | struct buffer_head *bitmap_bh = NULL; | |
1276 | ||
617ba13b | 1277 | es = EXT4_SB(sb)->s_es; |
ac27a0ec DK |
1278 | desc_count = 0; |
1279 | bitmap_count = 0; | |
1280 | gdp = NULL; | |
8df9675f | 1281 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1282 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1283 | if (!gdp) |
1284 | continue; | |
560671a0 | 1285 | desc_count += ext4_free_inodes_count(sb, gdp); |
ac27a0ec | 1286 | brelse(bitmap_bh); |
e29d1cde | 1287 | bitmap_bh = ext4_read_inode_bitmap(sb, i); |
9008a58e DW |
1288 | if (IS_ERR(bitmap_bh)) { |
1289 | bitmap_bh = NULL; | |
ac27a0ec | 1290 | continue; |
9008a58e | 1291 | } |
ac27a0ec | 1292 | |
f6fb99ca TT |
1293 | x = ext4_count_free(bitmap_bh->b_data, |
1294 | EXT4_INODES_PER_GROUP(sb) / 8); | |
c549a95d | 1295 | printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", |
785b4b3a | 1296 | (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); |
ac27a0ec DK |
1297 | bitmap_count += x; |
1298 | } | |
1299 | brelse(bitmap_bh); | |
4776004f TT |
1300 | printk(KERN_DEBUG "ext4_count_free_inodes: " |
1301 | "stored = %u, computed = %lu, %lu\n", | |
1302 | le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); | |
ac27a0ec DK |
1303 | return desc_count; |
1304 | #else | |
1305 | desc_count = 0; | |
8df9675f | 1306 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1307 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1308 | if (!gdp) |
1309 | continue; | |
560671a0 | 1310 | desc_count += ext4_free_inodes_count(sb, gdp); |
ac27a0ec DK |
1311 | cond_resched(); |
1312 | } | |
1313 | return desc_count; | |
1314 | #endif | |
1315 | } | |
1316 | ||
1317 | /* Called at mount-time, super-block is locked */ | |
af5bc92d | 1318 | unsigned long ext4_count_dirs(struct super_block * sb) |
ac27a0ec DK |
1319 | { |
1320 | unsigned long count = 0; | |
8df9675f | 1321 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
ac27a0ec | 1322 | |
8df9675f | 1323 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1324 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1325 | if (!gdp) |
1326 | continue; | |
560671a0 | 1327 | count += ext4_used_dirs_count(sb, gdp); |
ac27a0ec DK |
1328 | } |
1329 | return count; | |
1330 | } | |
bfff6873 LC |
1331 | |
1332 | /* | |
1333 | * Zeroes not yet zeroed inode table - just write zeroes through the whole | |
1334 | * inode table. Must be called without any spinlock held. The only place | |
1335 | * where it is called from on active part of filesystem is ext4lazyinit | |
1336 | * thread, so we do not need any special locks, however we have to prevent | |
1337 | * inode allocation from the current group, so we take alloc_sem lock, to | |
119c0d44 | 1338 | * block ext4_new_inode() until we are finished. |
bfff6873 | 1339 | */ |
e0cbee3e | 1340 | int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, |
bfff6873 LC |
1341 | int barrier) |
1342 | { | |
1343 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
1344 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1345 | struct ext4_group_desc *gdp = NULL; | |
1346 | struct buffer_head *group_desc_bh; | |
1347 | handle_t *handle; | |
1348 | ext4_fsblk_t blk; | |
1349 | int num, ret = 0, used_blks = 0; | |
bfff6873 LC |
1350 | |
1351 | /* This should not happen, but just to be sure check this */ | |
bc98a42c | 1352 | if (sb_rdonly(sb)) { |
bfff6873 LC |
1353 | ret = 1; |
1354 | goto out; | |
1355 | } | |
1356 | ||
1357 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); | |
1358 | if (!gdp) | |
1359 | goto out; | |
1360 | ||
1361 | /* | |
1362 | * We do not need to lock this, because we are the only one | |
1363 | * handling this flag. | |
1364 | */ | |
1365 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) | |
1366 | goto out; | |
1367 | ||
9924a92a | 1368 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
bfff6873 LC |
1369 | if (IS_ERR(handle)) { |
1370 | ret = PTR_ERR(handle); | |
1371 | goto out; | |
1372 | } | |
1373 | ||
1374 | down_write(&grp->alloc_sem); | |
1375 | /* | |
1376 | * If inode bitmap was already initialized there may be some | |
1377 | * used inodes so we need to skip blocks with used inodes in | |
1378 | * inode table. | |
1379 | */ | |
1380 | if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) | |
1381 | used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - | |
1382 | ext4_itable_unused_count(sb, gdp)), | |
1383 | sbi->s_inodes_per_block); | |
1384 | ||
857ac889 | 1385 | if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { |
1084f252 TT |
1386 | ext4_error(sb, "Something is wrong with group %u: " |
1387 | "used itable blocks: %d; " | |
1388 | "itable unused count: %u", | |
857ac889 LC |
1389 | group, used_blks, |
1390 | ext4_itable_unused_count(sb, gdp)); | |
1391 | ret = 1; | |
33853a0d | 1392 | goto err_out; |
857ac889 LC |
1393 | } |
1394 | ||
bfff6873 LC |
1395 | blk = ext4_inode_table(sb, gdp) + used_blks; |
1396 | num = sbi->s_itb_per_group - used_blks; | |
1397 | ||
1398 | BUFFER_TRACE(group_desc_bh, "get_write_access"); | |
1399 | ret = ext4_journal_get_write_access(handle, | |
1400 | group_desc_bh); | |
1401 | if (ret) | |
1402 | goto err_out; | |
1403 | ||
bfff6873 LC |
1404 | /* |
1405 | * Skip zeroout if the inode table is full. But we set the ZEROED | |
1406 | * flag anyway, because obviously, when it is full it does not need | |
1407 | * further zeroing. | |
1408 | */ | |
1409 | if (unlikely(num == 0)) | |
1410 | goto skip_zeroout; | |
1411 | ||
1412 | ext4_debug("going to zero out inode table in group %d\n", | |
1413 | group); | |
a107e5a3 | 1414 | ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); |
bfff6873 LC |
1415 | if (ret < 0) |
1416 | goto err_out; | |
a107e5a3 TT |
1417 | if (barrier) |
1418 | blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); | |
bfff6873 LC |
1419 | |
1420 | skip_zeroout: | |
1421 | ext4_lock_group(sb, group); | |
1422 | gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); | |
feb0ab32 | 1423 | ext4_group_desc_csum_set(sb, group, gdp); |
bfff6873 LC |
1424 | ext4_unlock_group(sb, group); |
1425 | ||
1426 | BUFFER_TRACE(group_desc_bh, | |
1427 | "call ext4_handle_dirty_metadata"); | |
1428 | ret = ext4_handle_dirty_metadata(handle, NULL, | |
1429 | group_desc_bh); | |
1430 | ||
1431 | err_out: | |
1432 | up_write(&grp->alloc_sem); | |
1433 | ext4_journal_stop(handle); | |
1434 | out: | |
1435 | return ret; | |
1436 | } |