Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/ialloc.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * BSD ufs-inspired inode and directory allocation by | |
10 | * Stephen Tweedie (sct@redhat.com), 1993 | |
11 | * Big-endian to little-endian byte-swapping/bitmaps by | |
12 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
13 | */ | |
14 | ||
15 | #include <linux/time.h> | |
16 | #include <linux/fs.h> | |
dab291af | 17 | #include <linux/jbd2.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> |
ac27a0ec | 25 | #include <asm/byteorder.h> |
9bffad1e | 26 | |
3dcf5451 CH |
27 | #include "ext4.h" |
28 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
29 | #include "xattr.h" |
30 | #include "acl.h" | |
31 | ||
9bffad1e TT |
32 | #include <trace/events/ext4.h> |
33 | ||
ac27a0ec DK |
34 | /* |
35 | * ialloc.c contains the inodes allocation and deallocation routines | |
36 | */ | |
37 | ||
38 | /* | |
39 | * The free inodes are managed by bitmaps. A file system contains several | |
40 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap | |
41 | * block for inodes, N blocks for the inode table and data blocks. | |
42 | * | |
43 | * The file system contains group descriptors which are located after the | |
44 | * super block. Each descriptor contains the number of the bitmap block and | |
45 | * the free blocks count in the block. | |
46 | */ | |
47 | ||
717d50e4 AD |
48 | /* |
49 | * To avoid calling the atomic setbit hundreds or thousands of times, we only | |
50 | * need to use it within a single byte (to ensure we get endianness right). | |
51 | * We can use memset for the rest of the bitmap as there are no other users. | |
52 | */ | |
61d08673 | 53 | void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) |
717d50e4 AD |
54 | { |
55 | int i; | |
56 | ||
57 | if (start_bit >= end_bit) | |
58 | return; | |
59 | ||
60 | ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); | |
61 | for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) | |
62 | ext4_set_bit(i, bitmap); | |
63 | if (i < end_bit) | |
64 | memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); | |
65 | } | |
66 | ||
67 | /* Initializes an uninitialized inode bitmap */ | |
1f109d5a TT |
68 | static unsigned ext4_init_inode_bitmap(struct super_block *sb, |
69 | struct buffer_head *bh, | |
70 | ext4_group_t block_group, | |
71 | struct ext4_group_desc *gdp) | |
717d50e4 | 72 | { |
bdfb6ff4 | 73 | struct ext4_group_info *grp; |
717d50e4 AD |
74 | J_ASSERT_BH(bh, buffer_locked(bh)); |
75 | ||
76 | /* If checksum is bad mark all blocks and inodes use to prevent | |
77 | * allocation, essentially implementing a per-group read-only flag. */ | |
feb0ab32 | 78 | if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { |
12062ddd | 79 | ext4_error(sb, "Checksum bad for group %u", block_group); |
bdfb6ff4 DW |
80 | grp = ext4_get_group_info(sb, block_group); |
81 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); | |
82 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); | |
717d50e4 AD |
83 | return 0; |
84 | } | |
85 | ||
86 | memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); | |
61d08673 | 87 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, |
717d50e4 | 88 | bh->b_data); |
41a246d1 DW |
89 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, |
90 | EXT4_INODES_PER_GROUP(sb) / 8); | |
feb0ab32 | 91 | ext4_group_desc_csum_set(sb, block_group, gdp); |
717d50e4 AD |
92 | |
93 | return EXT4_INODES_PER_GROUP(sb); | |
94 | } | |
ac27a0ec | 95 | |
813e5727 TT |
96 | void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) |
97 | { | |
98 | if (uptodate) { | |
99 | set_buffer_uptodate(bh); | |
100 | set_bitmap_uptodate(bh); | |
101 | } | |
102 | unlock_buffer(bh); | |
103 | put_bh(bh); | |
104 | } | |
105 | ||
ac27a0ec DK |
106 | /* |
107 | * Read the inode allocation bitmap for a given block_group, reading | |
108 | * into the specified slot in the superblock's bitmap cache. | |
109 | * | |
110 | * Return buffer_head of bitmap on success or NULL. | |
111 | */ | |
112 | static struct buffer_head * | |
e29d1cde | 113 | ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) |
ac27a0ec | 114 | { |
617ba13b | 115 | struct ext4_group_desc *desc; |
ac27a0ec | 116 | struct buffer_head *bh = NULL; |
e29d1cde | 117 | ext4_fsblk_t bitmap_blk; |
87a39389 | 118 | struct ext4_group_info *grp; |
ac27a0ec | 119 | |
617ba13b | 120 | desc = ext4_get_group_desc(sb, block_group, NULL); |
ac27a0ec | 121 | if (!desc) |
e29d1cde | 122 | return NULL; |
bfff6873 | 123 | |
e29d1cde ES |
124 | bitmap_blk = ext4_inode_bitmap(sb, desc); |
125 | bh = sb_getblk(sb, bitmap_blk); | |
126 | if (unlikely(!bh)) { | |
12062ddd | 127 | ext4_error(sb, "Cannot read inode bitmap - " |
a9df9a49 | 128 | "block_group = %u, inode_bitmap = %llu", |
e29d1cde ES |
129 | block_group, bitmap_blk); |
130 | return NULL; | |
131 | } | |
2ccb5fb9 | 132 | if (bitmap_uptodate(bh)) |
41a246d1 | 133 | goto verify; |
e29d1cde | 134 | |
c806e68f | 135 | lock_buffer(bh); |
2ccb5fb9 AK |
136 | if (bitmap_uptodate(bh)) { |
137 | unlock_buffer(bh); | |
41a246d1 | 138 | goto verify; |
2ccb5fb9 | 139 | } |
bfff6873 | 140 | |
955ce5f5 | 141 | ext4_lock_group(sb, block_group); |
717d50e4 | 142 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { |
e29d1cde | 143 | ext4_init_inode_bitmap(sb, bh, block_group, desc); |
2ccb5fb9 | 144 | set_bitmap_uptodate(bh); |
e29d1cde | 145 | set_buffer_uptodate(bh); |
41a246d1 | 146 | set_buffer_verified(bh); |
955ce5f5 | 147 | ext4_unlock_group(sb, block_group); |
3300beda | 148 | unlock_buffer(bh); |
e29d1cde | 149 | return bh; |
717d50e4 | 150 | } |
955ce5f5 | 151 | ext4_unlock_group(sb, block_group); |
bfff6873 | 152 | |
2ccb5fb9 AK |
153 | if (buffer_uptodate(bh)) { |
154 | /* | |
155 | * if not uninit if bh is uptodate, | |
156 | * bitmap is also uptodate | |
157 | */ | |
158 | set_bitmap_uptodate(bh); | |
159 | unlock_buffer(bh); | |
41a246d1 | 160 | goto verify; |
2ccb5fb9 AK |
161 | } |
162 | /* | |
813e5727 | 163 | * submit the buffer_head for reading |
2ccb5fb9 | 164 | */ |
0562e0ba | 165 | trace_ext4_load_inode_bitmap(sb, block_group); |
813e5727 TT |
166 | bh->b_end_io = ext4_end_bitmap_read; |
167 | get_bh(bh); | |
9f203507 | 168 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
813e5727 TT |
169 | wait_on_buffer(bh); |
170 | if (!buffer_uptodate(bh)) { | |
e29d1cde | 171 | put_bh(bh); |
12062ddd | 172 | ext4_error(sb, "Cannot read inode bitmap - " |
813e5727 TT |
173 | "block_group = %u, inode_bitmap = %llu", |
174 | block_group, bitmap_blk); | |
e29d1cde ES |
175 | return NULL; |
176 | } | |
41a246d1 DW |
177 | |
178 | verify: | |
179 | ext4_lock_group(sb, block_group); | |
180 | if (!buffer_verified(bh) && | |
181 | !ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, | |
182 | EXT4_INODES_PER_GROUP(sb) / 8)) { | |
183 | ext4_unlock_group(sb, block_group); | |
184 | put_bh(bh); | |
185 | ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " | |
186 | "inode_bitmap = %llu", block_group, bitmap_blk); | |
87a39389 DW |
187 | grp = ext4_get_group_info(sb, block_group); |
188 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); | |
41a246d1 DW |
189 | return NULL; |
190 | } | |
191 | ext4_unlock_group(sb, block_group); | |
192 | set_buffer_verified(bh); | |
ac27a0ec DK |
193 | return bh; |
194 | } | |
195 | ||
196 | /* | |
197 | * NOTE! When we get the inode, we're the only people | |
198 | * that have access to it, and as such there are no | |
199 | * race conditions we have to worry about. The inode | |
200 | * is not on the hash-lists, and it cannot be reached | |
201 | * through the filesystem because the directory entry | |
202 | * has been deleted earlier. | |
203 | * | |
204 | * HOWEVER: we must make sure that we get no aliases, | |
205 | * which means that we have to call "clear_inode()" | |
206 | * _before_ we mark the inode not in use in the inode | |
207 | * bitmaps. Otherwise a newly created file might use | |
208 | * the same inode number (not actually the same pointer | |
209 | * though), and then we'd have two inodes sharing the | |
210 | * same inode number and space on the harddisk. | |
211 | */ | |
af5bc92d | 212 | void ext4_free_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 213 | { |
af5bc92d | 214 | struct super_block *sb = inode->i_sb; |
ac27a0ec DK |
215 | int is_directory; |
216 | unsigned long ino; | |
217 | struct buffer_head *bitmap_bh = NULL; | |
218 | struct buffer_head *bh2; | |
fd2d4291 | 219 | ext4_group_t block_group; |
ac27a0ec | 220 | unsigned long bit; |
af5bc92d TT |
221 | struct ext4_group_desc *gdp; |
222 | struct ext4_super_block *es; | |
617ba13b | 223 | struct ext4_sb_info *sbi; |
7ce9d5d1 | 224 | int fatal = 0, err, count, cleared; |
87a39389 | 225 | struct ext4_group_info *grp; |
ac27a0ec | 226 | |
92b97816 TT |
227 | if (!sb) { |
228 | printk(KERN_ERR "EXT4-fs: %s:%d: inode on " | |
229 | "nonexistent device\n", __func__, __LINE__); | |
ac27a0ec DK |
230 | return; |
231 | } | |
92b97816 TT |
232 | if (atomic_read(&inode->i_count) > 1) { |
233 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", | |
234 | __func__, __LINE__, inode->i_ino, | |
235 | atomic_read(&inode->i_count)); | |
ac27a0ec DK |
236 | return; |
237 | } | |
92b97816 TT |
238 | if (inode->i_nlink) { |
239 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", | |
240 | __func__, __LINE__, inode->i_ino, inode->i_nlink); | |
ac27a0ec DK |
241 | return; |
242 | } | |
617ba13b | 243 | sbi = EXT4_SB(sb); |
ac27a0ec DK |
244 | |
245 | ino = inode->i_ino; | |
af5bc92d | 246 | ext4_debug("freeing inode %lu\n", ino); |
9bffad1e | 247 | trace_ext4_free_inode(inode); |
ac27a0ec DK |
248 | |
249 | /* | |
250 | * Note: we must free any quota before locking the superblock, | |
251 | * as writing the quota to disk may need the lock as well. | |
252 | */ | |
871a2931 | 253 | dquot_initialize(inode); |
617ba13b | 254 | ext4_xattr_delete_inode(handle, inode); |
63936dda | 255 | dquot_free_inode(inode); |
9f754758 | 256 | dquot_drop(inode); |
ac27a0ec DK |
257 | |
258 | is_directory = S_ISDIR(inode->i_mode); | |
259 | ||
260 | /* Do this BEFORE marking the inode not in use or returning an error */ | |
0930fcc1 | 261 | ext4_clear_inode(inode); |
ac27a0ec | 262 | |
617ba13b MC |
263 | es = EXT4_SB(sb)->s_es; |
264 | if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { | |
12062ddd | 265 | ext4_error(sb, "reserved or nonexistent inode %lu", ino); |
ac27a0ec DK |
266 | goto error_return; |
267 | } | |
617ba13b MC |
268 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
269 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); | |
e29d1cde | 270 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
87a39389 DW |
271 | /* Don't bother if the inode bitmap is corrupt. */ |
272 | grp = ext4_get_group_info(sb, block_group); | |
273 | if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) || !bitmap_bh) | |
ac27a0ec DK |
274 | goto error_return; |
275 | ||
276 | BUFFER_TRACE(bitmap_bh, "get_write_access"); | |
617ba13b | 277 | fatal = ext4_journal_get_write_access(handle, bitmap_bh); |
ac27a0ec DK |
278 | if (fatal) |
279 | goto error_return; | |
280 | ||
d17413c0 DM |
281 | fatal = -ESRCH; |
282 | gdp = ext4_get_group_desc(sb, block_group, &bh2); | |
283 | if (gdp) { | |
ac27a0ec | 284 | BUFFER_TRACE(bh2, "get_write_access"); |
617ba13b | 285 | fatal = ext4_journal_get_write_access(handle, bh2); |
d17413c0 DM |
286 | } |
287 | ext4_lock_group(sb, block_group); | |
597d508c | 288 | cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); |
d17413c0 DM |
289 | if (fatal || !cleared) { |
290 | ext4_unlock_group(sb, block_group); | |
291 | goto out; | |
292 | } | |
7d39db14 | 293 | |
d17413c0 DM |
294 | count = ext4_free_inodes_count(sb, gdp) + 1; |
295 | ext4_free_inodes_set(sb, gdp, count); | |
296 | if (is_directory) { | |
297 | count = ext4_used_dirs_count(sb, gdp) - 1; | |
298 | ext4_used_dirs_set(sb, gdp, count); | |
299 | percpu_counter_dec(&sbi->s_dirs_counter); | |
ac27a0ec | 300 | } |
41a246d1 DW |
301 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, |
302 | EXT4_INODES_PER_GROUP(sb) / 8); | |
feb0ab32 | 303 | ext4_group_desc_csum_set(sb, block_group, gdp); |
d17413c0 | 304 | ext4_unlock_group(sb, block_group); |
ac27a0ec | 305 | |
d17413c0 DM |
306 | percpu_counter_inc(&sbi->s_freeinodes_counter); |
307 | if (sbi->s_log_groups_per_flex) { | |
308 | ext4_group_t f = ext4_flex_group(sbi, block_group); | |
9f24e420 | 309 | |
d17413c0 DM |
310 | atomic_inc(&sbi->s_flex_groups[f].free_inodes); |
311 | if (is_directory) | |
312 | atomic_dec(&sbi->s_flex_groups[f].used_dirs); | |
ac27a0ec | 313 | } |
d17413c0 DM |
314 | BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); |
315 | fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); | |
316 | out: | |
317 | if (cleared) { | |
318 | BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); | |
319 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); | |
320 | if (!fatal) | |
321 | fatal = err; | |
87a39389 | 322 | } else { |
d17413c0 | 323 | ext4_error(sb, "bit already cleared for inode %lu", ino); |
87a39389 DW |
324 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); |
325 | } | |
d17413c0 | 326 | |
ac27a0ec DK |
327 | error_return: |
328 | brelse(bitmap_bh); | |
617ba13b | 329 | ext4_std_error(sb, fatal); |
ac27a0ec DK |
330 | } |
331 | ||
a4912123 | 332 | struct orlov_stats { |
90ba983f | 333 | __u64 free_clusters; |
a4912123 | 334 | __u32 free_inodes; |
a4912123 TT |
335 | __u32 used_dirs; |
336 | }; | |
337 | ||
338 | /* | |
339 | * Helper function for Orlov's allocator; returns critical information | |
340 | * for a particular block group or flex_bg. If flex_size is 1, then g | |
341 | * is a block group number; otherwise it is flex_bg number. | |
342 | */ | |
1f109d5a TT |
343 | static void get_orlov_stats(struct super_block *sb, ext4_group_t g, |
344 | int flex_size, struct orlov_stats *stats) | |
a4912123 TT |
345 | { |
346 | struct ext4_group_desc *desc; | |
7d39db14 | 347 | struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; |
a4912123 | 348 | |
7d39db14 TT |
349 | if (flex_size > 1) { |
350 | stats->free_inodes = atomic_read(&flex_group[g].free_inodes); | |
90ba983f | 351 | stats->free_clusters = atomic64_read(&flex_group[g].free_clusters); |
7d39db14 TT |
352 | stats->used_dirs = atomic_read(&flex_group[g].used_dirs); |
353 | return; | |
354 | } | |
a4912123 | 355 | |
7d39db14 TT |
356 | desc = ext4_get_group_desc(sb, g, NULL); |
357 | if (desc) { | |
358 | stats->free_inodes = ext4_free_inodes_count(sb, desc); | |
021b65bb | 359 | stats->free_clusters = ext4_free_group_clusters(sb, desc); |
7d39db14 TT |
360 | stats->used_dirs = ext4_used_dirs_count(sb, desc); |
361 | } else { | |
362 | stats->free_inodes = 0; | |
24aaa8ef | 363 | stats->free_clusters = 0; |
7d39db14 | 364 | stats->used_dirs = 0; |
a4912123 TT |
365 | } |
366 | } | |
367 | ||
ac27a0ec DK |
368 | /* |
369 | * Orlov's allocator for directories. | |
370 | * | |
371 | * We always try to spread first-level directories. | |
372 | * | |
373 | * If there are blockgroups with both free inodes and free blocks counts | |
374 | * not worse than average we return one with smallest directory count. | |
375 | * Otherwise we simply return a random group. | |
376 | * | |
377 | * For the rest rules look so: | |
378 | * | |
379 | * It's OK to put directory into a group unless | |
380 | * it has too many directories already (max_dirs) or | |
381 | * it has too few free inodes left (min_inodes) or | |
382 | * it has too few free blocks left (min_blocks) or | |
1cc8dcf5 | 383 | * Parent's group is preferred, if it doesn't satisfy these |
ac27a0ec DK |
384 | * conditions we search cyclically through the rest. If none |
385 | * of the groups look good we just look for a group with more | |
386 | * free inodes than average (starting at parent's group). | |
ac27a0ec DK |
387 | */ |
388 | ||
2aa9fc4c | 389 | static int find_group_orlov(struct super_block *sb, struct inode *parent, |
dcca3fec | 390 | ext4_group_t *group, umode_t mode, |
f157a4aa | 391 | const struct qstr *qstr) |
ac27a0ec | 392 | { |
fd2d4291 | 393 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
617ba13b | 394 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
8df9675f | 395 | ext4_group_t real_ngroups = ext4_get_groups_count(sb); |
617ba13b | 396 | int inodes_per_group = EXT4_INODES_PER_GROUP(sb); |
14c83c9f | 397 | unsigned int freei, avefreei, grp_free; |
24aaa8ef | 398 | ext4_fsblk_t freeb, avefreec; |
ac27a0ec | 399 | unsigned int ndirs; |
a4912123 | 400 | int max_dirs, min_inodes; |
24aaa8ef | 401 | ext4_grpblk_t min_clusters; |
8df9675f | 402 | ext4_group_t i, grp, g, ngroups; |
617ba13b | 403 | struct ext4_group_desc *desc; |
a4912123 TT |
404 | struct orlov_stats stats; |
405 | int flex_size = ext4_flex_bg_size(sbi); | |
f157a4aa | 406 | struct dx_hash_info hinfo; |
a4912123 | 407 | |
8df9675f | 408 | ngroups = real_ngroups; |
a4912123 | 409 | if (flex_size > 1) { |
8df9675f | 410 | ngroups = (real_ngroups + flex_size - 1) >> |
a4912123 TT |
411 | sbi->s_log_groups_per_flex; |
412 | parent_group >>= sbi->s_log_groups_per_flex; | |
413 | } | |
ac27a0ec DK |
414 | |
415 | freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); | |
416 | avefreei = freei / ngroups; | |
57042651 TT |
417 | freeb = EXT4_C2B(sbi, |
418 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); | |
24aaa8ef TT |
419 | avefreec = freeb; |
420 | do_div(avefreec, ngroups); | |
ac27a0ec DK |
421 | ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); |
422 | ||
a4912123 TT |
423 | if (S_ISDIR(mode) && |
424 | ((parent == sb->s_root->d_inode) || | |
12e9b892 | 425 | (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { |
ac27a0ec | 426 | int best_ndir = inodes_per_group; |
2aa9fc4c | 427 | int ret = -1; |
ac27a0ec | 428 | |
f157a4aa TT |
429 | if (qstr) { |
430 | hinfo.hash_version = DX_HASH_HALF_MD4; | |
431 | hinfo.seed = sbi->s_hash_seed; | |
432 | ext4fs_dirhash(qstr->name, qstr->len, &hinfo); | |
433 | grp = hinfo.hash; | |
434 | } else | |
dd1f723b | 435 | grp = prandom_u32(); |
2aa9fc4c | 436 | parent_group = (unsigned)grp % ngroups; |
ac27a0ec | 437 | for (i = 0; i < ngroups; i++) { |
a4912123 TT |
438 | g = (parent_group + i) % ngroups; |
439 | get_orlov_stats(sb, g, flex_size, &stats); | |
440 | if (!stats.free_inodes) | |
ac27a0ec | 441 | continue; |
a4912123 | 442 | if (stats.used_dirs >= best_ndir) |
ac27a0ec | 443 | continue; |
a4912123 | 444 | if (stats.free_inodes < avefreei) |
ac27a0ec | 445 | continue; |
24aaa8ef | 446 | if (stats.free_clusters < avefreec) |
ac27a0ec | 447 | continue; |
a4912123 | 448 | grp = g; |
2aa9fc4c | 449 | ret = 0; |
a4912123 TT |
450 | best_ndir = stats.used_dirs; |
451 | } | |
452 | if (ret) | |
453 | goto fallback; | |
454 | found_flex_bg: | |
455 | if (flex_size == 1) { | |
456 | *group = grp; | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /* | |
461 | * We pack inodes at the beginning of the flexgroup's | |
462 | * inode tables. Block allocation decisions will do | |
463 | * something similar, although regular files will | |
464 | * start at 2nd block group of the flexgroup. See | |
465 | * ext4_ext_find_goal() and ext4_find_near(). | |
466 | */ | |
467 | grp *= flex_size; | |
468 | for (i = 0; i < flex_size; i++) { | |
8df9675f | 469 | if (grp+i >= real_ngroups) |
a4912123 TT |
470 | break; |
471 | desc = ext4_get_group_desc(sb, grp+i, NULL); | |
472 | if (desc && ext4_free_inodes_count(sb, desc)) { | |
473 | *group = grp+i; | |
474 | return 0; | |
475 | } | |
ac27a0ec | 476 | } |
ac27a0ec DK |
477 | goto fallback; |
478 | } | |
479 | ||
ac27a0ec | 480 | max_dirs = ndirs / ngroups + inodes_per_group / 16; |
a4912123 TT |
481 | min_inodes = avefreei - inodes_per_group*flex_size / 4; |
482 | if (min_inodes < 1) | |
483 | min_inodes = 1; | |
24aaa8ef | 484 | min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; |
a4912123 TT |
485 | |
486 | /* | |
487 | * Start looking in the flex group where we last allocated an | |
488 | * inode for this parent directory | |
489 | */ | |
490 | if (EXT4_I(parent)->i_last_alloc_group != ~0) { | |
491 | parent_group = EXT4_I(parent)->i_last_alloc_group; | |
492 | if (flex_size > 1) | |
493 | parent_group >>= sbi->s_log_groups_per_flex; | |
494 | } | |
ac27a0ec DK |
495 | |
496 | for (i = 0; i < ngroups; i++) { | |
a4912123 TT |
497 | grp = (parent_group + i) % ngroups; |
498 | get_orlov_stats(sb, grp, flex_size, &stats); | |
499 | if (stats.used_dirs >= max_dirs) | |
ac27a0ec | 500 | continue; |
a4912123 | 501 | if (stats.free_inodes < min_inodes) |
ac27a0ec | 502 | continue; |
24aaa8ef | 503 | if (stats.free_clusters < min_clusters) |
ac27a0ec | 504 | continue; |
a4912123 | 505 | goto found_flex_bg; |
ac27a0ec DK |
506 | } |
507 | ||
508 | fallback: | |
8df9675f | 509 | ngroups = real_ngroups; |
a4912123 | 510 | avefreei = freei / ngroups; |
b5451f7b | 511 | fallback_retry: |
a4912123 | 512 | parent_group = EXT4_I(parent)->i_block_group; |
ac27a0ec | 513 | for (i = 0; i < ngroups; i++) { |
a4912123 TT |
514 | grp = (parent_group + i) % ngroups; |
515 | desc = ext4_get_group_desc(sb, grp, NULL); | |
bb3d132a DC |
516 | if (desc) { |
517 | grp_free = ext4_free_inodes_count(sb, desc); | |
518 | if (grp_free && grp_free >= avefreei) { | |
519 | *group = grp; | |
520 | return 0; | |
521 | } | |
a4912123 | 522 | } |
ac27a0ec DK |
523 | } |
524 | ||
525 | if (avefreei) { | |
526 | /* | |
527 | * The free-inodes counter is approximate, and for really small | |
528 | * filesystems the above test can fail to find any blockgroups | |
529 | */ | |
530 | avefreei = 0; | |
b5451f7b | 531 | goto fallback_retry; |
ac27a0ec DK |
532 | } |
533 | ||
534 | return -1; | |
535 | } | |
536 | ||
2aa9fc4c | 537 | static int find_group_other(struct super_block *sb, struct inode *parent, |
dcca3fec | 538 | ext4_group_t *group, umode_t mode) |
ac27a0ec | 539 | { |
fd2d4291 | 540 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
8df9675f | 541 | ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); |
617ba13b | 542 | struct ext4_group_desc *desc; |
a4912123 TT |
543 | int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); |
544 | ||
545 | /* | |
546 | * Try to place the inode is the same flex group as its | |
547 | * parent. If we can't find space, use the Orlov algorithm to | |
548 | * find another flex group, and store that information in the | |
549 | * parent directory's inode information so that use that flex | |
550 | * group for future allocations. | |
551 | */ | |
552 | if (flex_size > 1) { | |
553 | int retry = 0; | |
554 | ||
555 | try_again: | |
556 | parent_group &= ~(flex_size-1); | |
557 | last = parent_group + flex_size; | |
558 | if (last > ngroups) | |
559 | last = ngroups; | |
560 | for (i = parent_group; i < last; i++) { | |
561 | desc = ext4_get_group_desc(sb, i, NULL); | |
562 | if (desc && ext4_free_inodes_count(sb, desc)) { | |
563 | *group = i; | |
564 | return 0; | |
565 | } | |
566 | } | |
567 | if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { | |
568 | retry = 1; | |
569 | parent_group = EXT4_I(parent)->i_last_alloc_group; | |
570 | goto try_again; | |
571 | } | |
572 | /* | |
573 | * If this didn't work, use the Orlov search algorithm | |
574 | * to find a new flex group; we pass in the mode to | |
575 | * avoid the topdir algorithms. | |
576 | */ | |
577 | *group = parent_group + flex_size; | |
578 | if (*group > ngroups) | |
579 | *group = 0; | |
7dc57615 | 580 | return find_group_orlov(sb, parent, group, mode, NULL); |
a4912123 | 581 | } |
ac27a0ec DK |
582 | |
583 | /* | |
584 | * Try to place the inode in its parent directory | |
585 | */ | |
2aa9fc4c AM |
586 | *group = parent_group; |
587 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 588 | if (desc && ext4_free_inodes_count(sb, desc) && |
021b65bb | 589 | ext4_free_group_clusters(sb, desc)) |
2aa9fc4c | 590 | return 0; |
ac27a0ec DK |
591 | |
592 | /* | |
593 | * We're going to place this inode in a different blockgroup from its | |
594 | * parent. We want to cause files in a common directory to all land in | |
595 | * the same blockgroup. But we want files which are in a different | |
596 | * directory which shares a blockgroup with our parent to land in a | |
597 | * different blockgroup. | |
598 | * | |
599 | * So add our directory's i_ino into the starting point for the hash. | |
600 | */ | |
2aa9fc4c | 601 | *group = (*group + parent->i_ino) % ngroups; |
ac27a0ec DK |
602 | |
603 | /* | |
604 | * Use a quadratic hash to find a group with a free inode and some free | |
605 | * blocks. | |
606 | */ | |
607 | for (i = 1; i < ngroups; i <<= 1) { | |
2aa9fc4c AM |
608 | *group += i; |
609 | if (*group >= ngroups) | |
610 | *group -= ngroups; | |
611 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 612 | if (desc && ext4_free_inodes_count(sb, desc) && |
021b65bb | 613 | ext4_free_group_clusters(sb, desc)) |
2aa9fc4c | 614 | return 0; |
ac27a0ec DK |
615 | } |
616 | ||
617 | /* | |
618 | * That failed: try linear search for a free inode, even if that group | |
619 | * has no free blocks. | |
620 | */ | |
2aa9fc4c | 621 | *group = parent_group; |
ac27a0ec | 622 | for (i = 0; i < ngroups; i++) { |
2aa9fc4c AM |
623 | if (++*group >= ngroups) |
624 | *group = 0; | |
625 | desc = ext4_get_group_desc(sb, *group, NULL); | |
560671a0 | 626 | if (desc && ext4_free_inodes_count(sb, desc)) |
2aa9fc4c | 627 | return 0; |
ac27a0ec DK |
628 | } |
629 | ||
630 | return -1; | |
631 | } | |
632 | ||
19883bd9 TT |
633 | /* |
634 | * In no journal mode, if an inode has recently been deleted, we want | |
635 | * to avoid reusing it until we're reasonably sure the inode table | |
636 | * block has been written back to disk. (Yes, these values are | |
637 | * somewhat arbitrary...) | |
638 | */ | |
639 | #define RECENTCY_MIN 5 | |
640 | #define RECENTCY_DIRTY 30 | |
641 | ||
642 | static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino) | |
643 | { | |
644 | struct ext4_group_desc *gdp; | |
645 | struct ext4_inode *raw_inode; | |
646 | struct buffer_head *bh; | |
647 | unsigned long dtime, now; | |
648 | int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; | |
649 | int offset, ret = 0, recentcy = RECENTCY_MIN; | |
650 | ||
651 | gdp = ext4_get_group_desc(sb, group, NULL); | |
652 | if (unlikely(!gdp)) | |
653 | return 0; | |
654 | ||
655 | bh = sb_getblk(sb, ext4_inode_table(sb, gdp) + | |
656 | (ino / inodes_per_block)); | |
657 | if (unlikely(!bh) || !buffer_uptodate(bh)) | |
658 | /* | |
659 | * If the block is not in the buffer cache, then it | |
660 | * must have been written out. | |
661 | */ | |
662 | goto out; | |
663 | ||
664 | offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
665 | raw_inode = (struct ext4_inode *) (bh->b_data + offset); | |
666 | dtime = le32_to_cpu(raw_inode->i_dtime); | |
667 | now = get_seconds(); | |
668 | if (buffer_dirty(bh)) | |
669 | recentcy += RECENTCY_DIRTY; | |
670 | ||
671 | if (dtime && (dtime < now) && (now < dtime + recentcy)) | |
672 | ret = 1; | |
673 | out: | |
674 | brelse(bh); | |
675 | return ret; | |
676 | } | |
677 | ||
ac27a0ec DK |
678 | /* |
679 | * There are two policies for allocating an inode. If the new inode is | |
680 | * a directory, then a forward search is made for a block group with both | |
681 | * free space and a low directory-to-inode ratio; if that fails, then of | |
682 | * the groups with above-average free space, that group with the fewest | |
683 | * directories already is chosen. | |
684 | * | |
685 | * For other inodes, search forward from the parent directory's block | |
686 | * group to find a free inode. | |
687 | */ | |
1139575a TT |
688 | struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, |
689 | umode_t mode, const struct qstr *qstr, | |
690 | __u32 goal, uid_t *owner, int handle_type, | |
691 | unsigned int line_no, int nblocks) | |
ac27a0ec DK |
692 | { |
693 | struct super_block *sb; | |
3300beda AK |
694 | struct buffer_head *inode_bitmap_bh = NULL; |
695 | struct buffer_head *group_desc_bh; | |
8df9675f | 696 | ext4_group_t ngroups, group = 0; |
ac27a0ec | 697 | unsigned long ino = 0; |
af5bc92d TT |
698 | struct inode *inode; |
699 | struct ext4_group_desc *gdp = NULL; | |
617ba13b MC |
700 | struct ext4_inode_info *ei; |
701 | struct ext4_sb_info *sbi; | |
39341867 | 702 | int ret2, err = 0; |
ac27a0ec | 703 | struct inode *ret; |
2aa9fc4c | 704 | ext4_group_t i; |
772cb7c8 | 705 | ext4_group_t flex_group; |
87a39389 | 706 | struct ext4_group_info *grp; |
ac27a0ec DK |
707 | |
708 | /* Cannot create files in a deleted directory */ | |
709 | if (!dir || !dir->i_nlink) | |
710 | return ERR_PTR(-EPERM); | |
711 | ||
712 | sb = dir->i_sb; | |
8df9675f | 713 | ngroups = ext4_get_groups_count(sb); |
9bffad1e | 714 | trace_ext4_request_inode(dir, mode); |
ac27a0ec DK |
715 | inode = new_inode(sb); |
716 | if (!inode) | |
717 | return ERR_PTR(-ENOMEM); | |
617ba13b | 718 | ei = EXT4_I(inode); |
617ba13b | 719 | sbi = EXT4_SB(sb); |
772cb7c8 | 720 | |
eb9cc7e1 JK |
721 | /* |
722 | * Initalize owners and quota early so that we don't have to account | |
723 | * for quota initialization worst case in standard inode creating | |
724 | * transaction | |
725 | */ | |
726 | if (owner) { | |
727 | inode->i_mode = mode; | |
728 | i_uid_write(inode, owner[0]); | |
729 | i_gid_write(inode, owner[1]); | |
730 | } else if (test_opt(sb, GRPID)) { | |
731 | inode->i_mode = mode; | |
732 | inode->i_uid = current_fsuid(); | |
733 | inode->i_gid = dir->i_gid; | |
734 | } else | |
735 | inode_init_owner(inode, dir, mode); | |
736 | dquot_initialize(inode); | |
737 | ||
11013911 AD |
738 | if (!goal) |
739 | goal = sbi->s_inode_goal; | |
740 | ||
e6462869 | 741 | if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { |
11013911 AD |
742 | group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); |
743 | ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); | |
744 | ret2 = 0; | |
745 | goto got_group; | |
746 | } | |
747 | ||
4113c4ca LC |
748 | if (S_ISDIR(mode)) |
749 | ret2 = find_group_orlov(sb, dir, &group, mode, qstr); | |
750 | else | |
a4912123 | 751 | ret2 = find_group_other(sb, dir, &group, mode); |
ac27a0ec | 752 | |
772cb7c8 | 753 | got_group: |
a4912123 | 754 | EXT4_I(dir)->i_last_alloc_group = group; |
ac27a0ec | 755 | err = -ENOSPC; |
2aa9fc4c | 756 | if (ret2 == -1) |
ac27a0ec DK |
757 | goto out; |
758 | ||
119c0d44 TT |
759 | /* |
760 | * Normally we will only go through one pass of this loop, | |
761 | * unless we get unlucky and it turns out the group we selected | |
762 | * had its last inode grabbed by someone else. | |
763 | */ | |
11013911 | 764 | for (i = 0; i < ngroups; i++, ino = 0) { |
ac27a0ec DK |
765 | err = -EIO; |
766 | ||
3300beda | 767 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); |
ac27a0ec | 768 | if (!gdp) |
eb9cc7e1 | 769 | goto out; |
ac27a0ec | 770 | |
f2a09af6 YY |
771 | /* |
772 | * Check free inodes count before loading bitmap. | |
773 | */ | |
774 | if (ext4_free_inodes_count(sb, gdp) == 0) { | |
775 | if (++group == ngroups) | |
776 | group = 0; | |
777 | continue; | |
778 | } | |
779 | ||
87a39389 DW |
780 | grp = ext4_get_group_info(sb, group); |
781 | /* Skip groups with already-known suspicious inode tables */ | |
782 | if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { | |
783 | if (++group == ngroups) | |
784 | group = 0; | |
785 | continue; | |
786 | } | |
787 | ||
3300beda AK |
788 | brelse(inode_bitmap_bh); |
789 | inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); | |
87a39389 DW |
790 | /* Skip groups with suspicious inode tables */ |
791 | if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) || !inode_bitmap_bh) { | |
792 | if (++group == ngroups) | |
793 | group = 0; | |
794 | continue; | |
795 | } | |
ac27a0ec | 796 | |
ac27a0ec | 797 | repeat_in_this_group: |
617ba13b | 798 | ino = ext4_find_next_zero_bit((unsigned long *) |
3300beda AK |
799 | inode_bitmap_bh->b_data, |
800 | EXT4_INODES_PER_GROUP(sb), ino); | |
a34eb503 TT |
801 | if (ino >= EXT4_INODES_PER_GROUP(sb)) |
802 | goto next_group; | |
119c0d44 TT |
803 | if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) { |
804 | ext4_error(sb, "reserved inode found cleared - " | |
805 | "inode=%lu", ino + 1); | |
806 | continue; | |
807 | } | |
19883bd9 TT |
808 | if ((EXT4_SB(sb)->s_journal == NULL) && |
809 | recently_deleted(sb, group, ino)) { | |
810 | ino++; | |
811 | goto next_inode; | |
812 | } | |
1139575a TT |
813 | if (!handle) { |
814 | BUG_ON(nblocks <= 0); | |
815 | handle = __ext4_journal_start_sb(dir->i_sb, line_no, | |
5fe2fe89 JK |
816 | handle_type, nblocks, |
817 | 0); | |
1139575a TT |
818 | if (IS_ERR(handle)) { |
819 | err = PTR_ERR(handle); | |
eb9cc7e1 JK |
820 | ext4_std_error(sb, err); |
821 | goto out; | |
1139575a TT |
822 | } |
823 | } | |
ffb5387e ES |
824 | BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); |
825 | err = ext4_journal_get_write_access(handle, inode_bitmap_bh); | |
eb9cc7e1 JK |
826 | if (err) { |
827 | ext4_std_error(sb, err); | |
828 | goto out; | |
829 | } | |
119c0d44 TT |
830 | ext4_lock_group(sb, group); |
831 | ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); | |
832 | ext4_unlock_group(sb, group); | |
833 | ino++; /* the inode bitmap is zero-based */ | |
834 | if (!ret2) | |
835 | goto got; /* we grabbed the inode! */ | |
19883bd9 | 836 | next_inode: |
119c0d44 TT |
837 | if (ino < EXT4_INODES_PER_GROUP(sb)) |
838 | goto repeat_in_this_group; | |
a34eb503 TT |
839 | next_group: |
840 | if (++group == ngroups) | |
841 | group = 0; | |
ac27a0ec DK |
842 | } |
843 | err = -ENOSPC; | |
844 | goto out; | |
845 | ||
846 | got: | |
ffb5387e ES |
847 | BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); |
848 | err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); | |
eb9cc7e1 JK |
849 | if (err) { |
850 | ext4_std_error(sb, err); | |
851 | goto out; | |
852 | } | |
ffb5387e | 853 | |
717d50e4 | 854 | /* We may have to initialize the block bitmap if it isn't already */ |
feb0ab32 | 855 | if (ext4_has_group_desc_csum(sb) && |
717d50e4 | 856 | gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
3300beda | 857 | struct buffer_head *block_bitmap_bh; |
717d50e4 | 858 | |
3300beda AK |
859 | block_bitmap_bh = ext4_read_block_bitmap(sb, group); |
860 | BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); | |
861 | err = ext4_journal_get_write_access(handle, block_bitmap_bh); | |
717d50e4 | 862 | if (err) { |
3300beda | 863 | brelse(block_bitmap_bh); |
eb9cc7e1 JK |
864 | ext4_std_error(sb, err); |
865 | goto out; | |
717d50e4 AD |
866 | } |
867 | ||
fd034a84 TT |
868 | BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); |
869 | err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); | |
fd034a84 | 870 | |
717d50e4 | 871 | /* recheck and clear flag under lock if we still need to */ |
fd034a84 | 872 | ext4_lock_group(sb, group); |
717d50e4 | 873 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
3300beda | 874 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); |
021b65bb | 875 | ext4_free_group_clusters_set(sb, gdp, |
cff1dfd7 | 876 | ext4_free_clusters_after_init(sb, group, gdp)); |
fa77dcfa | 877 | ext4_block_bitmap_csum_set(sb, group, gdp, |
79f1ba49 | 878 | block_bitmap_bh); |
feb0ab32 | 879 | ext4_group_desc_csum_set(sb, group, gdp); |
717d50e4 | 880 | } |
955ce5f5 | 881 | ext4_unlock_group(sb, group); |
aeb1e5d6 | 882 | brelse(block_bitmap_bh); |
717d50e4 | 883 | |
eb9cc7e1 JK |
884 | if (err) { |
885 | ext4_std_error(sb, err); | |
886 | goto out; | |
887 | } | |
717d50e4 | 888 | } |
119c0d44 | 889 | |
119c0d44 TT |
890 | BUFFER_TRACE(group_desc_bh, "get_write_access"); |
891 | err = ext4_journal_get_write_access(handle, group_desc_bh); | |
eb9cc7e1 JK |
892 | if (err) { |
893 | ext4_std_error(sb, err); | |
894 | goto out; | |
895 | } | |
119c0d44 TT |
896 | |
897 | /* Update the relevant bg descriptor fields */ | |
41a246d1 | 898 | if (ext4_has_group_desc_csum(sb)) { |
119c0d44 TT |
899 | int free; |
900 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
901 | ||
902 | down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ | |
903 | ext4_lock_group(sb, group); /* while we modify the bg desc */ | |
904 | free = EXT4_INODES_PER_GROUP(sb) - | |
905 | ext4_itable_unused_count(sb, gdp); | |
906 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { | |
907 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); | |
908 | free = 0; | |
909 | } | |
910 | /* | |
911 | * Check the relative inode number against the last used | |
912 | * relative inode number in this group. if it is greater | |
913 | * we need to update the bg_itable_unused count | |
914 | */ | |
915 | if (ino > free) | |
916 | ext4_itable_unused_set(sb, gdp, | |
917 | (EXT4_INODES_PER_GROUP(sb) - ino)); | |
918 | up_read(&grp->alloc_sem); | |
6f2e9f0e TM |
919 | } else { |
920 | ext4_lock_group(sb, group); | |
119c0d44 | 921 | } |
6f2e9f0e | 922 | |
119c0d44 TT |
923 | ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); |
924 | if (S_ISDIR(mode)) { | |
925 | ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); | |
926 | if (sbi->s_log_groups_per_flex) { | |
927 | ext4_group_t f = ext4_flex_group(sbi, group); | |
928 | ||
929 | atomic_inc(&sbi->s_flex_groups[f].used_dirs); | |
930 | } | |
931 | } | |
41a246d1 DW |
932 | if (ext4_has_group_desc_csum(sb)) { |
933 | ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, | |
934 | EXT4_INODES_PER_GROUP(sb) / 8); | |
feb0ab32 | 935 | ext4_group_desc_csum_set(sb, group, gdp); |
119c0d44 | 936 | } |
6f2e9f0e | 937 | ext4_unlock_group(sb, group); |
119c0d44 | 938 | |
3300beda AK |
939 | BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); |
940 | err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); | |
eb9cc7e1 JK |
941 | if (err) { |
942 | ext4_std_error(sb, err); | |
943 | goto out; | |
944 | } | |
ac27a0ec DK |
945 | |
946 | percpu_counter_dec(&sbi->s_freeinodes_counter); | |
947 | if (S_ISDIR(mode)) | |
948 | percpu_counter_inc(&sbi->s_dirs_counter); | |
ac27a0ec | 949 | |
772cb7c8 JS |
950 | if (sbi->s_log_groups_per_flex) { |
951 | flex_group = ext4_flex_group(sbi, group); | |
9f24e420 | 952 | atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); |
772cb7c8 | 953 | } |
ac27a0ec | 954 | |
717d50e4 | 955 | inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); |
ac27a0ec DK |
956 | /* This is the optimal IO size (for stat), not the fs block size */ |
957 | inode->i_blocks = 0; | |
ef7f3835 KS |
958 | inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = |
959 | ext4_current_time(inode); | |
ac27a0ec DK |
960 | |
961 | memset(ei->i_data, 0, sizeof(ei->i_data)); | |
962 | ei->i_dir_start_lookup = 0; | |
963 | ei->i_disksize = 0; | |
964 | ||
4af83508 | 965 | /* Don't inherit extent flag from directory, amongst others. */ |
2dc6b0d4 DG |
966 | ei->i_flags = |
967 | ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); | |
ac27a0ec | 968 | ei->i_file_acl = 0; |
ac27a0ec | 969 | ei->i_dtime = 0; |
ac27a0ec | 970 | ei->i_block_group = group; |
a4912123 | 971 | ei->i_last_alloc_group = ~0; |
ac27a0ec | 972 | |
617ba13b | 973 | ext4_set_inode_flags(inode); |
ac27a0ec | 974 | if (IS_DIRSYNC(inode)) |
0390131b | 975 | ext4_handle_sync(handle); |
6b38e842 | 976 | if (insert_inode_locked(inode) < 0) { |
acd6ad83 JK |
977 | /* |
978 | * Likely a bitmap corruption causing inode to be allocated | |
979 | * twice. | |
980 | */ | |
981 | err = -EIO; | |
eb9cc7e1 JK |
982 | ext4_error(sb, "failed to insert inode %lu: doubly allocated?", |
983 | inode->i_ino); | |
984 | goto out; | |
6b38e842 | 985 | } |
ac27a0ec DK |
986 | spin_lock(&sbi->s_next_gen_lock); |
987 | inode->i_generation = sbi->s_next_generation++; | |
988 | spin_unlock(&sbi->s_next_gen_lock); | |
989 | ||
814525f4 DW |
990 | /* Precompute checksum seed for inode metadata */ |
991 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
992 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { | |
993 | __u32 csum; | |
814525f4 DW |
994 | __le32 inum = cpu_to_le32(inode->i_ino); |
995 | __le32 gen = cpu_to_le32(inode->i_generation); | |
996 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, | |
997 | sizeof(inum)); | |
998 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, | |
999 | sizeof(gen)); | |
1000 | } | |
1001 | ||
353eb83c | 1002 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
19f5fb7a | 1003 | ext4_set_inode_state(inode, EXT4_STATE_NEW); |
ef7f3835 KS |
1004 | |
1005 | ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; | |
ac27a0ec | 1006 | |
f08225d1 TM |
1007 | ei->i_inline_off = 0; |
1008 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_INLINE_DATA)) | |
1009 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1010 | ||
ac27a0ec | 1011 | ret = inode; |
63936dda CH |
1012 | err = dquot_alloc_inode(inode); |
1013 | if (err) | |
ac27a0ec | 1014 | goto fail_drop; |
ac27a0ec | 1015 | |
617ba13b | 1016 | err = ext4_init_acl(handle, inode, dir); |
ac27a0ec DK |
1017 | if (err) |
1018 | goto fail_free_drop; | |
1019 | ||
2a7dba39 | 1020 | err = ext4_init_security(handle, inode, dir, qstr); |
ac27a0ec DK |
1021 | if (err) |
1022 | goto fail_free_drop; | |
1023 | ||
83982b6f | 1024 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
e4079a11 | 1025 | /* set extent flag only for directory, file and normal symlink*/ |
e65187e6 | 1026 | if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { |
12e9b892 | 1027 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
42bf0383 | 1028 | ext4_ext_tree_init(handle, inode); |
42bf0383 | 1029 | } |
a86c6181 | 1030 | } |
ac27a0ec | 1031 | |
688f869c TT |
1032 | if (ext4_handle_valid(handle)) { |
1033 | ei->i_sync_tid = handle->h_transaction->t_tid; | |
1034 | ei->i_datasync_tid = handle->h_transaction->t_tid; | |
1035 | } | |
1036 | ||
8753e88f AK |
1037 | err = ext4_mark_inode_dirty(handle, inode); |
1038 | if (err) { | |
1039 | ext4_std_error(sb, err); | |
1040 | goto fail_free_drop; | |
1041 | } | |
1042 | ||
617ba13b | 1043 | ext4_debug("allocating inode %lu\n", inode->i_ino); |
9bffad1e | 1044 | trace_ext4_allocate_inode(inode, dir, mode); |
3300beda | 1045 | brelse(inode_bitmap_bh); |
ac27a0ec DK |
1046 | return ret; |
1047 | ||
1048 | fail_free_drop: | |
63936dda | 1049 | dquot_free_inode(inode); |
ac27a0ec | 1050 | fail_drop: |
6d6b77f1 | 1051 | clear_nlink(inode); |
6b38e842 | 1052 | unlock_new_inode(inode); |
eb9cc7e1 JK |
1053 | out: |
1054 | dquot_drop(inode); | |
1055 | inode->i_flags |= S_NOQUOTA; | |
ac27a0ec | 1056 | iput(inode); |
3300beda | 1057 | brelse(inode_bitmap_bh); |
ac27a0ec DK |
1058 | return ERR_PTR(err); |
1059 | } | |
1060 | ||
1061 | /* Verify that we are loading a valid orphan from disk */ | |
617ba13b | 1062 | struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) |
ac27a0ec | 1063 | { |
617ba13b | 1064 | unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); |
fd2d4291 | 1065 | ext4_group_t block_group; |
ac27a0ec | 1066 | int bit; |
1d1fe1ee | 1067 | struct buffer_head *bitmap_bh; |
ac27a0ec | 1068 | struct inode *inode = NULL; |
1d1fe1ee | 1069 | long err = -EIO; |
ac27a0ec DK |
1070 | |
1071 | /* Error cases - e2fsck has already cleaned up for us */ | |
1072 | if (ino > max_ino) { | |
12062ddd | 1073 | ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino); |
1d1fe1ee | 1074 | goto error; |
ac27a0ec DK |
1075 | } |
1076 | ||
617ba13b MC |
1077 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
1078 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); | |
e29d1cde | 1079 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
ac27a0ec | 1080 | if (!bitmap_bh) { |
12062ddd | 1081 | ext4_warning(sb, "inode bitmap error for orphan %lu", ino); |
1d1fe1ee | 1082 | goto error; |
ac27a0ec DK |
1083 | } |
1084 | ||
1085 | /* Having the inode bit set should be a 100% indicator that this | |
1086 | * is a valid orphan (no e2fsck run on fs). Orphans also include | |
1087 | * inodes that were being truncated, so we can't check i_nlink==0. | |
1088 | */ | |
1d1fe1ee DH |
1089 | if (!ext4_test_bit(bit, bitmap_bh->b_data)) |
1090 | goto bad_orphan; | |
1091 | ||
1092 | inode = ext4_iget(sb, ino); | |
1093 | if (IS_ERR(inode)) | |
1094 | goto iget_failed; | |
1095 | ||
91ef4caf DG |
1096 | /* |
1097 | * If the orphans has i_nlinks > 0 then it should be able to be | |
1098 | * truncated, otherwise it won't be removed from the orphan list | |
1099 | * during processing and an infinite loop will result. | |
1100 | */ | |
1101 | if (inode->i_nlink && !ext4_can_truncate(inode)) | |
1102 | goto bad_orphan; | |
1103 | ||
1d1fe1ee DH |
1104 | if (NEXT_ORPHAN(inode) > max_ino) |
1105 | goto bad_orphan; | |
1106 | brelse(bitmap_bh); | |
1107 | return inode; | |
1108 | ||
1109 | iget_failed: | |
1110 | err = PTR_ERR(inode); | |
1111 | inode = NULL; | |
1112 | bad_orphan: | |
12062ddd | 1113 | ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino); |
8de5c325 | 1114 | printk(KERN_WARNING "ext4_test_bit(bit=%d, block=%llu) = %d\n", |
1d1fe1ee DH |
1115 | bit, (unsigned long long)bitmap_bh->b_blocknr, |
1116 | ext4_test_bit(bit, bitmap_bh->b_data)); | |
8de5c325 | 1117 | printk(KERN_WARNING "inode=%p\n", inode); |
1d1fe1ee | 1118 | if (inode) { |
8de5c325 | 1119 | printk(KERN_WARNING "is_bad_inode(inode)=%d\n", |
1d1fe1ee | 1120 | is_bad_inode(inode)); |
8de5c325 | 1121 | printk(KERN_WARNING "NEXT_ORPHAN(inode)=%u\n", |
1d1fe1ee | 1122 | NEXT_ORPHAN(inode)); |
8de5c325 TT |
1123 | printk(KERN_WARNING "max_ino=%lu\n", max_ino); |
1124 | printk(KERN_WARNING "i_nlink=%u\n", inode->i_nlink); | |
ac27a0ec | 1125 | /* Avoid freeing blocks if we got a bad deleted inode */ |
1d1fe1ee | 1126 | if (inode->i_nlink == 0) |
ac27a0ec DK |
1127 | inode->i_blocks = 0; |
1128 | iput(inode); | |
ac27a0ec | 1129 | } |
ac27a0ec | 1130 | brelse(bitmap_bh); |
1d1fe1ee DH |
1131 | error: |
1132 | return ERR_PTR(err); | |
ac27a0ec DK |
1133 | } |
1134 | ||
af5bc92d | 1135 | unsigned long ext4_count_free_inodes(struct super_block *sb) |
ac27a0ec DK |
1136 | { |
1137 | unsigned long desc_count; | |
617ba13b | 1138 | struct ext4_group_desc *gdp; |
8df9675f | 1139 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
617ba13b MC |
1140 | #ifdef EXT4FS_DEBUG |
1141 | struct ext4_super_block *es; | |
ac27a0ec DK |
1142 | unsigned long bitmap_count, x; |
1143 | struct buffer_head *bitmap_bh = NULL; | |
1144 | ||
617ba13b | 1145 | es = EXT4_SB(sb)->s_es; |
ac27a0ec DK |
1146 | desc_count = 0; |
1147 | bitmap_count = 0; | |
1148 | gdp = NULL; | |
8df9675f | 1149 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1150 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1151 | if (!gdp) |
1152 | continue; | |
560671a0 | 1153 | desc_count += ext4_free_inodes_count(sb, gdp); |
ac27a0ec | 1154 | brelse(bitmap_bh); |
e29d1cde | 1155 | bitmap_bh = ext4_read_inode_bitmap(sb, i); |
ac27a0ec DK |
1156 | if (!bitmap_bh) |
1157 | continue; | |
1158 | ||
f6fb99ca TT |
1159 | x = ext4_count_free(bitmap_bh->b_data, |
1160 | EXT4_INODES_PER_GROUP(sb) / 8); | |
c549a95d | 1161 | printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", |
785b4b3a | 1162 | (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); |
ac27a0ec DK |
1163 | bitmap_count += x; |
1164 | } | |
1165 | brelse(bitmap_bh); | |
4776004f TT |
1166 | printk(KERN_DEBUG "ext4_count_free_inodes: " |
1167 | "stored = %u, computed = %lu, %lu\n", | |
1168 | le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); | |
ac27a0ec DK |
1169 | return desc_count; |
1170 | #else | |
1171 | desc_count = 0; | |
8df9675f | 1172 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1173 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1174 | if (!gdp) |
1175 | continue; | |
560671a0 | 1176 | desc_count += ext4_free_inodes_count(sb, gdp); |
ac27a0ec DK |
1177 | cond_resched(); |
1178 | } | |
1179 | return desc_count; | |
1180 | #endif | |
1181 | } | |
1182 | ||
1183 | /* Called at mount-time, super-block is locked */ | |
af5bc92d | 1184 | unsigned long ext4_count_dirs(struct super_block * sb) |
ac27a0ec DK |
1185 | { |
1186 | unsigned long count = 0; | |
8df9675f | 1187 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
ac27a0ec | 1188 | |
8df9675f | 1189 | for (i = 0; i < ngroups; i++) { |
af5bc92d | 1190 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
1191 | if (!gdp) |
1192 | continue; | |
560671a0 | 1193 | count += ext4_used_dirs_count(sb, gdp); |
ac27a0ec DK |
1194 | } |
1195 | return count; | |
1196 | } | |
bfff6873 LC |
1197 | |
1198 | /* | |
1199 | * Zeroes not yet zeroed inode table - just write zeroes through the whole | |
1200 | * inode table. Must be called without any spinlock held. The only place | |
1201 | * where it is called from on active part of filesystem is ext4lazyinit | |
1202 | * thread, so we do not need any special locks, however we have to prevent | |
1203 | * inode allocation from the current group, so we take alloc_sem lock, to | |
119c0d44 | 1204 | * block ext4_new_inode() until we are finished. |
bfff6873 | 1205 | */ |
e0cbee3e | 1206 | int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, |
bfff6873 LC |
1207 | int barrier) |
1208 | { | |
1209 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
1210 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1211 | struct ext4_group_desc *gdp = NULL; | |
1212 | struct buffer_head *group_desc_bh; | |
1213 | handle_t *handle; | |
1214 | ext4_fsblk_t blk; | |
1215 | int num, ret = 0, used_blks = 0; | |
bfff6873 LC |
1216 | |
1217 | /* This should not happen, but just to be sure check this */ | |
1218 | if (sb->s_flags & MS_RDONLY) { | |
1219 | ret = 1; | |
1220 | goto out; | |
1221 | } | |
1222 | ||
1223 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); | |
1224 | if (!gdp) | |
1225 | goto out; | |
1226 | ||
1227 | /* | |
1228 | * We do not need to lock this, because we are the only one | |
1229 | * handling this flag. | |
1230 | */ | |
1231 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) | |
1232 | goto out; | |
1233 | ||
9924a92a | 1234 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
bfff6873 LC |
1235 | if (IS_ERR(handle)) { |
1236 | ret = PTR_ERR(handle); | |
1237 | goto out; | |
1238 | } | |
1239 | ||
1240 | down_write(&grp->alloc_sem); | |
1241 | /* | |
1242 | * If inode bitmap was already initialized there may be some | |
1243 | * used inodes so we need to skip blocks with used inodes in | |
1244 | * inode table. | |
1245 | */ | |
1246 | if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) | |
1247 | used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - | |
1248 | ext4_itable_unused_count(sb, gdp)), | |
1249 | sbi->s_inodes_per_block); | |
1250 | ||
857ac889 | 1251 | if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { |
1084f252 TT |
1252 | ext4_error(sb, "Something is wrong with group %u: " |
1253 | "used itable blocks: %d; " | |
1254 | "itable unused count: %u", | |
857ac889 LC |
1255 | group, used_blks, |
1256 | ext4_itable_unused_count(sb, gdp)); | |
1257 | ret = 1; | |
33853a0d | 1258 | goto err_out; |
857ac889 LC |
1259 | } |
1260 | ||
bfff6873 LC |
1261 | blk = ext4_inode_table(sb, gdp) + used_blks; |
1262 | num = sbi->s_itb_per_group - used_blks; | |
1263 | ||
1264 | BUFFER_TRACE(group_desc_bh, "get_write_access"); | |
1265 | ret = ext4_journal_get_write_access(handle, | |
1266 | group_desc_bh); | |
1267 | if (ret) | |
1268 | goto err_out; | |
1269 | ||
bfff6873 LC |
1270 | /* |
1271 | * Skip zeroout if the inode table is full. But we set the ZEROED | |
1272 | * flag anyway, because obviously, when it is full it does not need | |
1273 | * further zeroing. | |
1274 | */ | |
1275 | if (unlikely(num == 0)) | |
1276 | goto skip_zeroout; | |
1277 | ||
1278 | ext4_debug("going to zero out inode table in group %d\n", | |
1279 | group); | |
a107e5a3 | 1280 | ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); |
bfff6873 LC |
1281 | if (ret < 0) |
1282 | goto err_out; | |
a107e5a3 TT |
1283 | if (barrier) |
1284 | blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); | |
bfff6873 LC |
1285 | |
1286 | skip_zeroout: | |
1287 | ext4_lock_group(sb, group); | |
1288 | gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); | |
feb0ab32 | 1289 | ext4_group_desc_csum_set(sb, group, gdp); |
bfff6873 LC |
1290 | ext4_unlock_group(sb, group); |
1291 | ||
1292 | BUFFER_TRACE(group_desc_bh, | |
1293 | "call ext4_handle_dirty_metadata"); | |
1294 | ret = ext4_handle_dirty_metadata(handle, NULL, | |
1295 | group_desc_bh); | |
1296 | ||
1297 | err_out: | |
1298 | up_write(&grp->alloc_sem); | |
1299 | ext4_journal_stop(handle); | |
1300 | out: | |
1301 | return ret; | |
1302 | } |