blob: da18a74b966a91da09ae9710ba8976a111f3946f [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/ialloc.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
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>
Mingming Caodab291a2006-10-11 01:21:01 -070017#include <linux/jbd2.h>
Mingming Cao617ba132006-10-11 01:20:53 -070018#include <linux/ext4_fs.h>
Mingming Caodab291a2006-10-11 01:21:01 -070019#include <linux/ext4_jbd2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070020#include <linux/stat.h>
21#include <linux/string.h>
22#include <linux/quotaops.h>
23#include <linux/buffer_head.h>
24#include <linux/random.h>
25#include <linux/bitops.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070026#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070027#include <asm/byteorder.h>
28
29#include "xattr.h"
30#include "acl.h"
Andreas Dilger717d50e2007-10-16 18:38:25 -040031#include "group.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070032
33/*
34 * ialloc.c contains the inodes allocation and deallocation routines
35 */
36
37/*
38 * The free inodes are managed by bitmaps. A file system contains several
39 * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
40 * block for inodes, N blocks for the inode table and data blocks.
41 *
42 * The file system contains group descriptors which are located after the
43 * super block. Each descriptor contains the number of the bitmap block and
44 * the free blocks count in the block.
45 */
46
Andreas Dilger717d50e2007-10-16 18:38:25 -040047/*
48 * To avoid calling the atomic setbit hundreds or thousands of times, we only
49 * need to use it within a single byte (to ensure we get endianness right).
50 * We can use memset for the rest of the bitmap as there are no other users.
51 */
52void mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
53{
54 int i;
55
56 if (start_bit >= end_bit)
57 return;
58
59 ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
60 for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
61 ext4_set_bit(i, bitmap);
62 if (i < end_bit)
63 memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
64}
65
66/* Initializes an uninitialized inode bitmap */
Avantika Mathurfd2d4292008-01-28 23:58:27 -050067unsigned ext4_init_inode_bitmap(struct super_block *sb, struct buffer_head *bh,
68 ext4_group_t block_group,
Andreas Dilger717d50e2007-10-16 18:38:25 -040069 struct ext4_group_desc *gdp)
70{
71 struct ext4_sb_info *sbi = EXT4_SB(sb);
72
73 J_ASSERT_BH(bh, buffer_locked(bh));
74
75 /* If checksum is bad mark all blocks and inodes use to prevent
76 * allocation, essentially implementing a per-group read-only flag. */
77 if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) {
Avantika Mathurfd2d4292008-01-28 23:58:27 -050078 ext4_error(sb, __FUNCTION__, "Checksum bad for group %lu\n",
Andreas Dilger717d50e2007-10-16 18:38:25 -040079 block_group);
80 gdp->bg_free_blocks_count = 0;
81 gdp->bg_free_inodes_count = 0;
82 gdp->bg_itable_unused = 0;
83 memset(bh->b_data, 0xff, sb->s_blocksize);
84 return 0;
85 }
86
87 memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
88 mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), EXT4_BLOCKS_PER_GROUP(sb),
89 bh->b_data);
90
91 return EXT4_INODES_PER_GROUP(sb);
92}
Dave Kleikampac27a0e2006-10-11 01:20:50 -070093
94/*
95 * Read the inode allocation bitmap for a given block_group, reading
96 * into the specified slot in the superblock's bitmap cache.
97 *
98 * Return buffer_head of bitmap on success or NULL.
99 */
100static struct buffer_head *
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500101read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700102{
Mingming Cao617ba132006-10-11 01:20:53 -0700103 struct ext4_group_desc *desc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700104 struct buffer_head *bh = NULL;
105
Mingming Cao617ba132006-10-11 01:20:53 -0700106 desc = ext4_get_group_desc(sb, block_group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700107 if (!desc)
108 goto error_out;
Andreas Dilger717d50e2007-10-16 18:38:25 -0400109 if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
110 bh = sb_getblk(sb, ext4_inode_bitmap(sb, desc));
111 if (!buffer_uptodate(bh)) {
112 lock_buffer(bh);
113 if (!buffer_uptodate(bh)) {
114 ext4_init_inode_bitmap(sb, bh, block_group,
115 desc);
116 set_buffer_uptodate(bh);
117 }
118 unlock_buffer(bh);
119 }
120 } else {
121 bh = sb_bread(sb, ext4_inode_bitmap(sb, desc));
122 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700123 if (!bh)
Mingming Cao617ba132006-10-11 01:20:53 -0700124 ext4_error(sb, "read_inode_bitmap",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700125 "Cannot read inode bitmap - "
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700126 "block_group = %lu, inode_bitmap = %llu",
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700127 block_group, ext4_inode_bitmap(sb, desc));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700128error_out:
129 return bh;
130}
131
132/*
133 * NOTE! When we get the inode, we're the only people
134 * that have access to it, and as such there are no
135 * race conditions we have to worry about. The inode
136 * is not on the hash-lists, and it cannot be reached
137 * through the filesystem because the directory entry
138 * has been deleted earlier.
139 *
140 * HOWEVER: we must make sure that we get no aliases,
141 * which means that we have to call "clear_inode()"
142 * _before_ we mark the inode not in use in the inode
143 * bitmaps. Otherwise a newly created file might use
144 * the same inode number (not actually the same pointer
145 * though), and then we'd have two inodes sharing the
146 * same inode number and space on the harddisk.
147 */
Mingming Cao617ba132006-10-11 01:20:53 -0700148void ext4_free_inode (handle_t *handle, struct inode * inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700149{
150 struct super_block * sb = inode->i_sb;
151 int is_directory;
152 unsigned long ino;
153 struct buffer_head *bitmap_bh = NULL;
154 struct buffer_head *bh2;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500155 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700156 unsigned long bit;
Mingming Cao617ba132006-10-11 01:20:53 -0700157 struct ext4_group_desc * gdp;
158 struct ext4_super_block * es;
159 struct ext4_sb_info *sbi;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700160 int fatal = 0, err;
161
162 if (atomic_read(&inode->i_count) > 1) {
Mingming Cao617ba132006-10-11 01:20:53 -0700163 printk ("ext4_free_inode: inode has count=%d\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164 atomic_read(&inode->i_count));
165 return;
166 }
167 if (inode->i_nlink) {
Mingming Cao617ba132006-10-11 01:20:53 -0700168 printk ("ext4_free_inode: inode has nlink=%d\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700169 inode->i_nlink);
170 return;
171 }
172 if (!sb) {
Mingming Cao617ba132006-10-11 01:20:53 -0700173 printk("ext4_free_inode: inode on nonexistent device\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700174 return;
175 }
Mingming Cao617ba132006-10-11 01:20:53 -0700176 sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700177
178 ino = inode->i_ino;
Mingming Cao617ba132006-10-11 01:20:53 -0700179 ext4_debug ("freeing inode %lu\n", ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700180
181 /*
182 * Note: we must free any quota before locking the superblock,
183 * as writing the quota to disk may need the lock as well.
184 */
185 DQUOT_INIT(inode);
Mingming Cao617ba132006-10-11 01:20:53 -0700186 ext4_xattr_delete_inode(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700187 DQUOT_FREE_INODE(inode);
188 DQUOT_DROP(inode);
189
190 is_directory = S_ISDIR(inode->i_mode);
191
192 /* Do this BEFORE marking the inode not in use or returning an error */
193 clear_inode (inode);
194
Mingming Cao617ba132006-10-11 01:20:53 -0700195 es = EXT4_SB(sb)->s_es;
196 if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
197 ext4_error (sb, "ext4_free_inode",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700198 "reserved or nonexistent inode %lu", ino);
199 goto error_return;
200 }
Mingming Cao617ba132006-10-11 01:20:53 -0700201 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
202 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700203 bitmap_bh = read_inode_bitmap(sb, block_group);
204 if (!bitmap_bh)
205 goto error_return;
206
207 BUFFER_TRACE(bitmap_bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -0700208 fatal = ext4_journal_get_write_access(handle, bitmap_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700209 if (fatal)
210 goto error_return;
211
212 /* Ok, now we can actually update the inode bitmaps.. */
Mingming Cao617ba132006-10-11 01:20:53 -0700213 if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214 bit, bitmap_bh->b_data))
Mingming Cao617ba132006-10-11 01:20:53 -0700215 ext4_error (sb, "ext4_free_inode",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700216 "bit already cleared for inode %lu", ino);
217 else {
Mingming Cao617ba132006-10-11 01:20:53 -0700218 gdp = ext4_get_group_desc (sb, block_group, &bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219
220 BUFFER_TRACE(bh2, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -0700221 fatal = ext4_journal_get_write_access(handle, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700222 if (fatal) goto error_return;
223
224 if (gdp) {
225 spin_lock(sb_bgl_lock(sbi, block_group));
226 gdp->bg_free_inodes_count = cpu_to_le16(
227 le16_to_cpu(gdp->bg_free_inodes_count) + 1);
228 if (is_directory)
229 gdp->bg_used_dirs_count = cpu_to_le16(
230 le16_to_cpu(gdp->bg_used_dirs_count) - 1);
Andreas Dilger717d50e2007-10-16 18:38:25 -0400231 gdp->bg_checksum = ext4_group_desc_csum(sbi,
232 block_group, gdp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700233 spin_unlock(sb_bgl_lock(sbi, block_group));
234 percpu_counter_inc(&sbi->s_freeinodes_counter);
235 if (is_directory)
236 percpu_counter_dec(&sbi->s_dirs_counter);
237
238 }
Mingming Cao617ba132006-10-11 01:20:53 -0700239 BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata");
240 err = ext4_journal_dirty_metadata(handle, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700241 if (!fatal) fatal = err;
242 }
Mingming Cao617ba132006-10-11 01:20:53 -0700243 BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata");
244 err = ext4_journal_dirty_metadata(handle, bitmap_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245 if (!fatal)
246 fatal = err;
247 sb->s_dirt = 1;
248error_return:
249 brelse(bitmap_bh);
Mingming Cao617ba132006-10-11 01:20:53 -0700250 ext4_std_error(sb, fatal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700251}
252
253/*
254 * There are two policies for allocating an inode. If the new inode is
255 * a directory, then a forward search is made for a block group with both
256 * free space and a low directory-to-inode ratio; if that fails, then of
257 * the groups with above-average free space, that group with the fewest
258 * directories already is chosen.
259 *
260 * For other inodes, search forward from the parent directory\'s block
261 * group to find a free inode.
262 */
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500263static int find_group_dir(struct super_block *sb, struct inode *parent,
264 ext4_group_t *best_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700265{
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500266 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700267 unsigned int freei, avefreei;
Mingming Cao617ba132006-10-11 01:20:53 -0700268 struct ext4_group_desc *desc, *best_desc = NULL;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500269 ext4_group_t group;
270 int ret = -1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700271
Mingming Cao617ba132006-10-11 01:20:53 -0700272 freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700273 avefreei = freei / ngroups;
274
275 for (group = 0; group < ngroups; group++) {
Eric Sandeenef2fb672007-10-16 23:26:30 -0700276 desc = ext4_get_group_desc (sb, group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700277 if (!desc || !desc->bg_free_inodes_count)
278 continue;
279 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
280 continue;
281 if (!best_desc ||
282 (le16_to_cpu(desc->bg_free_blocks_count) >
283 le16_to_cpu(best_desc->bg_free_blocks_count))) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500284 *best_group = group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285 best_desc = desc;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500286 ret = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700287 }
288 }
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500289 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700290}
291
292/*
293 * Orlov's allocator for directories.
294 *
295 * We always try to spread first-level directories.
296 *
297 * If there are blockgroups with both free inodes and free blocks counts
298 * not worse than average we return one with smallest directory count.
299 * Otherwise we simply return a random group.
300 *
301 * For the rest rules look so:
302 *
303 * It's OK to put directory into a group unless
304 * it has too many directories already (max_dirs) or
305 * it has too few free inodes left (min_inodes) or
306 * it has too few free blocks left (min_blocks) or
307 * it's already running too large debt (max_debt).
308 * Parent's group is prefered, if it doesn't satisfy these
309 * conditions we search cyclically through the rest. If none
310 * of the groups look good we just look for a group with more
311 * free inodes than average (starting at parent's group).
312 *
313 * Debt is incremented each time we allocate a directory and decremented
314 * when we allocate an inode, within 0--255.
315 */
316
317#define INODE_COST 64
318#define BLOCK_COST 256
319
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500320static int find_group_orlov(struct super_block *sb, struct inode *parent,
321 ext4_group_t *group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700322{
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500323 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
Mingming Cao617ba132006-10-11 01:20:53 -0700324 struct ext4_sb_info *sbi = EXT4_SB(sb);
325 struct ext4_super_block *es = sbi->s_es;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500326 ext4_group_t ngroups = sbi->s_groups_count;
Mingming Cao617ba132006-10-11 01:20:53 -0700327 int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700328 unsigned int freei, avefreei;
Mingming Cao617ba132006-10-11 01:20:53 -0700329 ext4_fsblk_t freeb, avefreeb;
330 ext4_fsblk_t blocks_per_dir;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700331 unsigned int ndirs;
332 int max_debt, max_dirs, min_inodes;
Mingming Cao617ba132006-10-11 01:20:53 -0700333 ext4_grpblk_t min_blocks;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500334 ext4_group_t i;
Mingming Cao617ba132006-10-11 01:20:53 -0700335 struct ext4_group_desc *desc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700336
337 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
338 avefreei = freei / ngroups;
339 freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700340 avefreeb = freeb;
Andrew Mortonf4e5bc22006-10-11 01:21:19 -0700341 do_div(avefreeb, ngroups);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700342 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
343
344 if ((parent == sb->s_root->d_inode) ||
Mingming Cao617ba132006-10-11 01:20:53 -0700345 (EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346 int best_ndir = inodes_per_group;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500347 ext4_group_t grp;
348 int ret = -1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700349
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500350 get_random_bytes(&grp, sizeof(grp));
351 parent_group = (unsigned)grp % ngroups;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352 for (i = 0; i < ngroups; i++) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500353 grp = (parent_group + i) % ngroups;
354 desc = ext4_get_group_desc(sb, grp, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700355 if (!desc || !desc->bg_free_inodes_count)
356 continue;
357 if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
358 continue;
359 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
360 continue;
361 if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
362 continue;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500363 *group = grp;
364 ret = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700365 best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
366 }
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500367 if (ret == 0)
368 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700369 goto fallback;
370 }
371
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700372 blocks_per_dir = ext4_blocks_count(es) - freeb;
Andrew Mortonf4e5bc22006-10-11 01:21:19 -0700373 do_div(blocks_per_dir, ndirs);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700374
375 max_dirs = ndirs / ngroups + inodes_per_group / 16;
376 min_inodes = avefreei - inodes_per_group / 4;
Mingming Cao617ba132006-10-11 01:20:53 -0700377 min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700379 max_debt = EXT4_BLOCKS_PER_GROUP(sb);
Andrew Mortonf4e5bc22006-10-11 01:21:19 -0700380 max_debt /= max_t(int, blocks_per_dir, BLOCK_COST);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700381 if (max_debt * INODE_COST > inodes_per_group)
382 max_debt = inodes_per_group / INODE_COST;
383 if (max_debt > 255)
384 max_debt = 255;
385 if (max_debt == 0)
386 max_debt = 1;
387
388 for (i = 0; i < ngroups; i++) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500389 *group = (parent_group + i) % ngroups;
390 desc = ext4_get_group_desc(sb, *group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700391 if (!desc || !desc->bg_free_inodes_count)
392 continue;
393 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
394 continue;
395 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
396 continue;
397 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
398 continue;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500399 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700400 }
401
402fallback:
403 for (i = 0; i < ngroups; i++) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500404 *group = (parent_group + i) % ngroups;
405 desc = ext4_get_group_desc(sb, *group, NULL);
406 if (desc && desc->bg_free_inodes_count &&
407 le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
408 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700409 }
410
411 if (avefreei) {
412 /*
413 * The free-inodes counter is approximate, and for really small
414 * filesystems the above test can fail to find any blockgroups
415 */
416 avefreei = 0;
417 goto fallback;
418 }
419
420 return -1;
421}
422
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500423static int find_group_other(struct super_block *sb, struct inode *parent,
424 ext4_group_t *group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700425{
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500426 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
427 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
Mingming Cao617ba132006-10-11 01:20:53 -0700428 struct ext4_group_desc *desc;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500429 ext4_group_t i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700430
431 /*
432 * Try to place the inode in its parent directory
433 */
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500434 *group = parent_group;
435 desc = ext4_get_group_desc(sb, *group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700436 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
437 le16_to_cpu(desc->bg_free_blocks_count))
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500438 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700439
440 /*
441 * We're going to place this inode in a different blockgroup from its
442 * parent. We want to cause files in a common directory to all land in
443 * the same blockgroup. But we want files which are in a different
444 * directory which shares a blockgroup with our parent to land in a
445 * different blockgroup.
446 *
447 * So add our directory's i_ino into the starting point for the hash.
448 */
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500449 *group = (*group + parent->i_ino) % ngroups;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700450
451 /*
452 * Use a quadratic hash to find a group with a free inode and some free
453 * blocks.
454 */
455 for (i = 1; i < ngroups; i <<= 1) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500456 *group += i;
457 if (*group >= ngroups)
458 *group -= ngroups;
459 desc = ext4_get_group_desc(sb, *group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700460 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
461 le16_to_cpu(desc->bg_free_blocks_count))
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500462 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700463 }
464
465 /*
466 * That failed: try linear search for a free inode, even if that group
467 * has no free blocks.
468 */
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500469 *group = parent_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700470 for (i = 0; i < ngroups; i++) {
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500471 if (++*group >= ngroups)
472 *group = 0;
473 desc = ext4_get_group_desc(sb, *group, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700474 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500475 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700476 }
477
478 return -1;
479}
480
481/*
482 * There are two policies for allocating an inode. If the new inode is
483 * a directory, then a forward search is made for a block group with both
484 * free space and a low directory-to-inode ratio; if that fails, then of
485 * the groups with above-average free space, that group with the fewest
486 * directories already is chosen.
487 *
488 * For other inodes, search forward from the parent directory's block
489 * group to find a free inode.
490 */
Mingming Cao617ba132006-10-11 01:20:53 -0700491struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700492{
493 struct super_block *sb;
494 struct buffer_head *bitmap_bh = NULL;
495 struct buffer_head *bh2;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500496 ext4_group_t group = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700497 unsigned long ino = 0;
498 struct inode * inode;
Mingming Cao617ba132006-10-11 01:20:53 -0700499 struct ext4_group_desc * gdp = NULL;
500 struct ext4_super_block * es;
501 struct ext4_inode_info *ei;
502 struct ext4_sb_info *sbi;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500503 int ret2, err = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700504 struct inode *ret;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500505 ext4_group_t i;
506 int free = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700507
508 /* Cannot create files in a deleted directory */
509 if (!dir || !dir->i_nlink)
510 return ERR_PTR(-EPERM);
511
512 sb = dir->i_sb;
513 inode = new_inode(sb);
514 if (!inode)
515 return ERR_PTR(-ENOMEM);
Mingming Cao617ba132006-10-11 01:20:53 -0700516 ei = EXT4_I(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517
Mingming Cao617ba132006-10-11 01:20:53 -0700518 sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700519 es = sbi->s_es;
520 if (S_ISDIR(mode)) {
521 if (test_opt (sb, OLDALLOC))
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500522 ret2 = find_group_dir(sb, dir, &group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523 else
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500524 ret2 = find_group_orlov(sb, dir, &group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700525 } else
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500526 ret2 = find_group_other(sb, dir, &group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700527
528 err = -ENOSPC;
Avantika Mathur2aa9fc42008-01-28 23:58:27 -0500529 if (ret2 == -1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530 goto out;
531
532 for (i = 0; i < sbi->s_groups_count; i++) {
533 err = -EIO;
534
Mingming Cao617ba132006-10-11 01:20:53 -0700535 gdp = ext4_get_group_desc(sb, group, &bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700536 if (!gdp)
537 goto fail;
538
539 brelse(bitmap_bh);
540 bitmap_bh = read_inode_bitmap(sb, group);
541 if (!bitmap_bh)
542 goto fail;
543
544 ino = 0;
545
546repeat_in_this_group:
Mingming Cao617ba132006-10-11 01:20:53 -0700547 ino = ext4_find_next_zero_bit((unsigned long *)
548 bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino);
549 if (ino < EXT4_INODES_PER_GROUP(sb)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700550
551 BUFFER_TRACE(bitmap_bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -0700552 err = ext4_journal_get_write_access(handle, bitmap_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700553 if (err)
554 goto fail;
555
Mingming Cao617ba132006-10-11 01:20:53 -0700556 if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700557 ino, bitmap_bh->b_data)) {
558 /* we won it */
559 BUFFER_TRACE(bitmap_bh,
Mingming Cao617ba132006-10-11 01:20:53 -0700560 "call ext4_journal_dirty_metadata");
561 err = ext4_journal_dirty_metadata(handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562 bitmap_bh);
563 if (err)
564 goto fail;
565 goto got;
566 }
567 /* we lost it */
Mingming Caodab291a2006-10-11 01:21:01 -0700568 jbd2_journal_release_buffer(handle, bitmap_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700569
Mingming Cao617ba132006-10-11 01:20:53 -0700570 if (++ino < EXT4_INODES_PER_GROUP(sb))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700571 goto repeat_in_this_group;
572 }
573
574 /*
575 * This case is possible in concurrent environment. It is very
576 * rare. We cannot repeat the find_group_xxx() call because
577 * that will simply return the same blockgroup, because the
578 * group descriptor metadata has not yet been updated.
579 * So we just go onto the next blockgroup.
580 */
581 if (++group == sbi->s_groups_count)
582 group = 0;
583 }
584 err = -ENOSPC;
585 goto out;
586
587got:
Andreas Dilger717d50e2007-10-16 18:38:25 -0400588 ino++;
589 if ((group == 0 && ino < EXT4_FIRST_INO(sb)) ||
590 ino > EXT4_INODES_PER_GROUP(sb)) {
591 ext4_error(sb, __FUNCTION__,
592 "reserved inode or inode > inodes count - "
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500593 "block_group = %lu, inode=%lu", group,
Andreas Dilger717d50e2007-10-16 18:38:25 -0400594 ino + group * EXT4_INODES_PER_GROUP(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595 err = -EIO;
596 goto fail;
597 }
598
599 BUFFER_TRACE(bh2, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -0700600 err = ext4_journal_get_write_access(handle, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700601 if (err) goto fail;
Andreas Dilger717d50e2007-10-16 18:38:25 -0400602
603 /* We may have to initialize the block bitmap if it isn't already */
604 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
605 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
606 struct buffer_head *block_bh = read_block_bitmap(sb, group);
607
608 BUFFER_TRACE(block_bh, "get block bitmap access");
609 err = ext4_journal_get_write_access(handle, block_bh);
610 if (err) {
611 brelse(block_bh);
612 goto fail;
613 }
614
615 free = 0;
616 spin_lock(sb_bgl_lock(sbi, group));
617 /* recheck and clear flag under lock if we still need to */
618 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
619 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
620 free = ext4_free_blocks_after_init(sb, group, gdp);
621 gdp->bg_free_blocks_count = cpu_to_le16(free);
622 }
623 spin_unlock(sb_bgl_lock(sbi, group));
624
625 /* Don't need to dirty bitmap block if we didn't change it */
626 if (free) {
627 BUFFER_TRACE(block_bh, "dirty block bitmap");
628 err = ext4_journal_dirty_metadata(handle, block_bh);
629 }
630
631 brelse(block_bh);
632 if (err)
633 goto fail;
634 }
635
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700636 spin_lock(sb_bgl_lock(sbi, group));
Andreas Dilger717d50e2007-10-16 18:38:25 -0400637 /* If we didn't allocate from within the initialized part of the inode
638 * table then we need to initialize up to this inode. */
639 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
640 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
641 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
642
643 /* When marking the block group with
644 * ~EXT4_BG_INODE_UNINIT we don't want to depend
645 * on the value of bg_itable_unsed even though
646 * mke2fs could have initialized the same for us.
647 * Instead we calculated the value below
648 */
649
650 free = 0;
651 } else {
652 free = EXT4_INODES_PER_GROUP(sb) -
653 le16_to_cpu(gdp->bg_itable_unused);
654 }
655
656 /*
657 * Check the relative inode number against the last used
658 * relative inode number in this group. if it is greater
659 * we need to update the bg_itable_unused count
660 *
661 */
662 if (ino > free)
663 gdp->bg_itable_unused =
664 cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino);
665 }
666
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700667 gdp->bg_free_inodes_count =
668 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
669 if (S_ISDIR(mode)) {
670 gdp->bg_used_dirs_count =
671 cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
672 }
Andreas Dilger717d50e2007-10-16 18:38:25 -0400673 gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700674 spin_unlock(sb_bgl_lock(sbi, group));
Mingming Cao617ba132006-10-11 01:20:53 -0700675 BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata");
676 err = ext4_journal_dirty_metadata(handle, bh2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677 if (err) goto fail;
678
679 percpu_counter_dec(&sbi->s_freeinodes_counter);
680 if (S_ISDIR(mode))
681 percpu_counter_inc(&sbi->s_dirs_counter);
682 sb->s_dirt = 1;
683
684 inode->i_uid = current->fsuid;
685 if (test_opt (sb, GRPID))
686 inode->i_gid = dir->i_gid;
687 else if (dir->i_mode & S_ISGID) {
688 inode->i_gid = dir->i_gid;
689 if (S_ISDIR(mode))
690 mode |= S_ISGID;
691 } else
692 inode->i_gid = current->fsgid;
693 inode->i_mode = mode;
694
Andreas Dilger717d50e2007-10-16 18:38:25 -0400695 inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700696 /* This is the optimal IO size (for stat), not the fs block size */
697 inode->i_blocks = 0;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400698 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
699 ext4_current_time(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700700
701 memset(ei->i_data, 0, sizeof(ei->i_data));
702 ei->i_dir_start_lookup = 0;
703 ei->i_disksize = 0;
704
Mingming Cao617ba132006-10-11 01:20:53 -0700705 ei->i_flags = EXT4_I(dir)->i_flags & ~EXT4_INDEX_FL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700706 if (S_ISLNK(mode))
Mingming Cao617ba132006-10-11 01:20:53 -0700707 ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700708 /* dirsync only applies to directories */
709 if (!S_ISDIR(mode))
Mingming Cao617ba132006-10-11 01:20:53 -0700710 ei->i_flags &= ~EXT4_DIRSYNC_FL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700711 ei->i_file_acl = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700712 ei->i_dtime = 0;
713 ei->i_block_alloc_info = NULL;
714 ei->i_block_group = group;
715
Mingming Cao617ba132006-10-11 01:20:53 -0700716 ext4_set_inode_flags(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700717 if (IS_DIRSYNC(inode))
718 handle->h_sync = 1;
719 insert_inode_hash(inode);
720 spin_lock(&sbi->s_next_gen_lock);
721 inode->i_generation = sbi->s_next_generation++;
722 spin_unlock(&sbi->s_next_gen_lock);
723
Mingming Cao617ba132006-10-11 01:20:53 -0700724 ei->i_state = EXT4_STATE_NEW;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400725
726 ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700727
728 ret = inode;
729 if(DQUOT_ALLOC_INODE(inode)) {
730 err = -EDQUOT;
731 goto fail_drop;
732 }
733
Mingming Cao617ba132006-10-11 01:20:53 -0700734 err = ext4_init_acl(handle, inode, dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700735 if (err)
736 goto fail_free_drop;
737
Mingming Cao617ba132006-10-11 01:20:53 -0700738 err = ext4_init_security(handle,inode, dir);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739 if (err)
740 goto fail_free_drop;
741
Mingming Cao617ba132006-10-11 01:20:53 -0700742 err = ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700743 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -0700744 ext4_std_error(sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700745 goto fail_free_drop;
746 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700747 if (test_opt(sb, EXTENTS)) {
748 EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
749 ext4_ext_tree_init(handle, inode);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -0500750 err = ext4_update_incompat_feature(handle, sb,
751 EXT4_FEATURE_INCOMPAT_EXTENTS);
752 if (err)
753 goto fail;
Alex Tomasa86c6182006-10-11 01:21:03 -0700754 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700755
Mingming Cao617ba132006-10-11 01:20:53 -0700756 ext4_debug("allocating inode %lu\n", inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700757 goto really_out;
758fail:
Mingming Cao617ba132006-10-11 01:20:53 -0700759 ext4_std_error(sb, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700760out:
761 iput(inode);
762 ret = ERR_PTR(err);
763really_out:
764 brelse(bitmap_bh);
765 return ret;
766
767fail_free_drop:
768 DQUOT_FREE_INODE(inode);
769
770fail_drop:
771 DQUOT_DROP(inode);
772 inode->i_flags |= S_NOQUOTA;
773 inode->i_nlink = 0;
774 iput(inode);
775 brelse(bitmap_bh);
776 return ERR_PTR(err);
777}
778
779/* Verify that we are loading a valid orphan from disk */
Mingming Cao617ba132006-10-11 01:20:53 -0700780struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700781{
Mingming Cao617ba132006-10-11 01:20:53 -0700782 unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500783 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700784 int bit;
David Howells1d1fe1e2008-02-07 00:15:37 -0800785 struct buffer_head *bitmap_bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700786 struct inode *inode = NULL;
David Howells1d1fe1e2008-02-07 00:15:37 -0800787 long err = -EIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700788
789 /* Error cases - e2fsck has already cleaned up for us */
790 if (ino > max_ino) {
Mingming Cao617ba132006-10-11 01:20:53 -0700791 ext4_warning(sb, __FUNCTION__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700792 "bad orphan ino %lu! e2fsck was run?", ino);
David Howells1d1fe1e2008-02-07 00:15:37 -0800793 goto error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700794 }
795
Mingming Cao617ba132006-10-11 01:20:53 -0700796 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
797 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700798 bitmap_bh = read_inode_bitmap(sb, block_group);
799 if (!bitmap_bh) {
Mingming Cao617ba132006-10-11 01:20:53 -0700800 ext4_warning(sb, __FUNCTION__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700801 "inode bitmap error for orphan %lu", ino);
David Howells1d1fe1e2008-02-07 00:15:37 -0800802 goto error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 }
804
805 /* Having the inode bit set should be a 100% indicator that this
806 * is a valid orphan (no e2fsck run on fs). Orphans also include
807 * inodes that were being truncated, so we can't check i_nlink==0.
808 */
David Howells1d1fe1e2008-02-07 00:15:37 -0800809 if (!ext4_test_bit(bit, bitmap_bh->b_data))
810 goto bad_orphan;
811
812 inode = ext4_iget(sb, ino);
813 if (IS_ERR(inode))
814 goto iget_failed;
815
816 if (NEXT_ORPHAN(inode) > max_ino)
817 goto bad_orphan;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700818 brelse(bitmap_bh);
819 return inode;
David Howells1d1fe1e2008-02-07 00:15:37 -0800820
821iget_failed:
822 err = PTR_ERR(inode);
823 inode = NULL;
824bad_orphan:
825 ext4_warning(sb, __FUNCTION__,
826 "bad orphan inode %lu! e2fsck was run?", ino);
827 printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
828 bit, (unsigned long long)bitmap_bh->b_blocknr,
829 ext4_test_bit(bit, bitmap_bh->b_data));
830 printk(KERN_NOTICE "inode=%p\n", inode);
831 if (inode) {
832 printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
833 is_bad_inode(inode));
834 printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
835 NEXT_ORPHAN(inode));
836 printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
837 /* Avoid freeing blocks if we got a bad deleted inode */
838 if (inode->i_nlink == 0)
839 inode->i_blocks = 0;
840 iput(inode);
841 }
842 brelse(bitmap_bh);
843error:
844 return ERR_PTR(err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845}
846
Mingming Cao617ba132006-10-11 01:20:53 -0700847unsigned long ext4_count_free_inodes (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700848{
849 unsigned long desc_count;
Mingming Cao617ba132006-10-11 01:20:53 -0700850 struct ext4_group_desc *gdp;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500851 ext4_group_t i;
Mingming Cao617ba132006-10-11 01:20:53 -0700852#ifdef EXT4FS_DEBUG
853 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700854 unsigned long bitmap_count, x;
855 struct buffer_head *bitmap_bh = NULL;
856
Mingming Cao617ba132006-10-11 01:20:53 -0700857 es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700858 desc_count = 0;
859 bitmap_count = 0;
860 gdp = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -0700861 for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
862 gdp = ext4_get_group_desc (sb, i, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700863 if (!gdp)
864 continue;
865 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
866 brelse(bitmap_bh);
867 bitmap_bh = read_inode_bitmap(sb, i);
868 if (!bitmap_bh)
869 continue;
870
Mingming Cao617ba132006-10-11 01:20:53 -0700871 x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8);
Eric Sandeenc549a952008-01-28 23:58:27 -0500872 printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700873 i, le16_to_cpu(gdp->bg_free_inodes_count), x);
874 bitmap_count += x;
875 }
876 brelse(bitmap_bh);
Mingming Cao617ba132006-10-11 01:20:53 -0700877 printk("ext4_count_free_inodes: stored = %u, computed = %lu, %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700878 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
879 return desc_count;
880#else
881 desc_count = 0;
Mingming Cao617ba132006-10-11 01:20:53 -0700882 for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
883 gdp = ext4_get_group_desc (sb, i, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700884 if (!gdp)
885 continue;
886 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
887 cond_resched();
888 }
889 return desc_count;
890#endif
891}
892
893/* Called at mount-time, super-block is locked */
Mingming Cao617ba132006-10-11 01:20:53 -0700894unsigned long ext4_count_dirs (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700895{
896 unsigned long count = 0;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500897 ext4_group_t i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700898
Mingming Cao617ba132006-10-11 01:20:53 -0700899 for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
900 struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700901 if (!gdp)
902 continue;
903 count += le16_to_cpu(gdp->bg_used_dirs_count);
904 }
905 return count;
906}
907