1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/ialloc.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 5ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 6ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 7ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 8ac27a0ecSDave Kleikamp * 9ac27a0ecSDave Kleikamp * BSD ufs-inspired inode and directory allocation by 10ac27a0ecSDave Kleikamp * Stephen Tweedie (sct@redhat.com), 1993 11ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 12ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 13ac27a0ecSDave Kleikamp */ 14ac27a0ecSDave Kleikamp 15ac27a0ecSDave Kleikamp #include <linux/time.h> 16ac27a0ecSDave Kleikamp #include <linux/fs.h> 17dab291afSMingming Cao #include <linux/jbd2.h> 18617ba13bSMingming Cao #include <linux/ext4_fs.h> 19dab291afSMingming Cao #include <linux/ext4_jbd2.h> 20ac27a0ecSDave Kleikamp #include <linux/stat.h> 21ac27a0ecSDave Kleikamp #include <linux/string.h> 22ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 23ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 24ac27a0ecSDave Kleikamp #include <linux/random.h> 25ac27a0ecSDave Kleikamp #include <linux/bitops.h> 263a5b2ecdSMingming Cao #include <linux/blkdev.h> 27ac27a0ecSDave Kleikamp #include <asm/byteorder.h> 28ac27a0ecSDave Kleikamp 29ac27a0ecSDave Kleikamp #include "xattr.h" 30ac27a0ecSDave Kleikamp #include "acl.h" 31717d50e4SAndreas Dilger #include "group.h" 32ac27a0ecSDave Kleikamp 33ac27a0ecSDave Kleikamp /* 34ac27a0ecSDave Kleikamp * ialloc.c contains the inodes allocation and deallocation routines 35ac27a0ecSDave Kleikamp */ 36ac27a0ecSDave Kleikamp 37ac27a0ecSDave Kleikamp /* 38ac27a0ecSDave Kleikamp * The free inodes are managed by bitmaps. A file system contains several 39ac27a0ecSDave Kleikamp * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap 40ac27a0ecSDave Kleikamp * block for inodes, N blocks for the inode table and data blocks. 41ac27a0ecSDave Kleikamp * 42ac27a0ecSDave Kleikamp * The file system contains group descriptors which are located after the 43ac27a0ecSDave Kleikamp * super block. Each descriptor contains the number of the bitmap block and 44ac27a0ecSDave Kleikamp * the free blocks count in the block. 45ac27a0ecSDave Kleikamp */ 46ac27a0ecSDave Kleikamp 47717d50e4SAndreas Dilger /* 48717d50e4SAndreas Dilger * To avoid calling the atomic setbit hundreds or thousands of times, we only 49717d50e4SAndreas Dilger * need to use it within a single byte (to ensure we get endianness right). 50717d50e4SAndreas Dilger * We can use memset for the rest of the bitmap as there are no other users. 51717d50e4SAndreas Dilger */ 52717d50e4SAndreas Dilger void mark_bitmap_end(int start_bit, int end_bit, char *bitmap) 53717d50e4SAndreas Dilger { 54717d50e4SAndreas Dilger int i; 55717d50e4SAndreas Dilger 56717d50e4SAndreas Dilger if (start_bit >= end_bit) 57717d50e4SAndreas Dilger return; 58717d50e4SAndreas Dilger 59717d50e4SAndreas Dilger ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); 60717d50e4SAndreas Dilger for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) 61717d50e4SAndreas Dilger ext4_set_bit(i, bitmap); 62717d50e4SAndreas Dilger if (i < end_bit) 63717d50e4SAndreas Dilger memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); 64717d50e4SAndreas Dilger } 65717d50e4SAndreas Dilger 66717d50e4SAndreas Dilger /* Initializes an uninitialized inode bitmap */ 67717d50e4SAndreas Dilger unsigned ext4_init_inode_bitmap(struct super_block *sb, 68717d50e4SAndreas Dilger struct buffer_head *bh, int block_group, 69717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 70717d50e4SAndreas Dilger { 71717d50e4SAndreas Dilger struct ext4_sb_info *sbi = EXT4_SB(sb); 72717d50e4SAndreas Dilger 73717d50e4SAndreas Dilger J_ASSERT_BH(bh, buffer_locked(bh)); 74717d50e4SAndreas Dilger 75717d50e4SAndreas Dilger /* If checksum is bad mark all blocks and inodes use to prevent 76717d50e4SAndreas Dilger * allocation, essentially implementing a per-group read-only flag. */ 77717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { 78717d50e4SAndreas Dilger ext4_error(sb, __FUNCTION__, "Checksum bad for group %u\n", 79717d50e4SAndreas Dilger block_group); 80717d50e4SAndreas Dilger gdp->bg_free_blocks_count = 0; 81717d50e4SAndreas Dilger gdp->bg_free_inodes_count = 0; 82717d50e4SAndreas Dilger gdp->bg_itable_unused = 0; 83717d50e4SAndreas Dilger memset(bh->b_data, 0xff, sb->s_blocksize); 84717d50e4SAndreas Dilger return 0; 85717d50e4SAndreas Dilger } 86717d50e4SAndreas Dilger 87717d50e4SAndreas Dilger memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 88717d50e4SAndreas Dilger mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), EXT4_BLOCKS_PER_GROUP(sb), 89717d50e4SAndreas Dilger bh->b_data); 90717d50e4SAndreas Dilger 91717d50e4SAndreas Dilger return EXT4_INODES_PER_GROUP(sb); 92717d50e4SAndreas Dilger } 93ac27a0ecSDave Kleikamp 94ac27a0ecSDave Kleikamp /* 95ac27a0ecSDave Kleikamp * Read the inode allocation bitmap for a given block_group, reading 96ac27a0ecSDave Kleikamp * into the specified slot in the superblock's bitmap cache. 97ac27a0ecSDave Kleikamp * 98ac27a0ecSDave Kleikamp * Return buffer_head of bitmap on success or NULL. 99ac27a0ecSDave Kleikamp */ 100ac27a0ecSDave Kleikamp static struct buffer_head * 101ac27a0ecSDave Kleikamp read_inode_bitmap(struct super_block * sb, unsigned long block_group) 102ac27a0ecSDave Kleikamp { 103617ba13bSMingming Cao struct ext4_group_desc *desc; 104ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 105ac27a0ecSDave Kleikamp 106617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 107ac27a0ecSDave Kleikamp if (!desc) 108ac27a0ecSDave Kleikamp goto error_out; 109717d50e4SAndreas Dilger if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 110717d50e4SAndreas Dilger bh = sb_getblk(sb, ext4_inode_bitmap(sb, desc)); 111717d50e4SAndreas Dilger if (!buffer_uptodate(bh)) { 112717d50e4SAndreas Dilger lock_buffer(bh); 113717d50e4SAndreas Dilger if (!buffer_uptodate(bh)) { 114717d50e4SAndreas Dilger ext4_init_inode_bitmap(sb, bh, block_group, 115717d50e4SAndreas Dilger desc); 116717d50e4SAndreas Dilger set_buffer_uptodate(bh); 117717d50e4SAndreas Dilger } 118717d50e4SAndreas Dilger unlock_buffer(bh); 119717d50e4SAndreas Dilger } 120717d50e4SAndreas Dilger } else { 1218fadc143SAlexandre Ratchov bh = sb_bread(sb, ext4_inode_bitmap(sb, desc)); 122717d50e4SAndreas Dilger } 123ac27a0ecSDave Kleikamp if (!bh) 124617ba13bSMingming Cao ext4_error(sb, "read_inode_bitmap", 125ac27a0ecSDave Kleikamp "Cannot read inode bitmap - " 126bd81d8eeSLaurent Vivier "block_group = %lu, inode_bitmap = %llu", 1278fadc143SAlexandre Ratchov block_group, ext4_inode_bitmap(sb, desc)); 128ac27a0ecSDave Kleikamp error_out: 129ac27a0ecSDave Kleikamp return bh; 130ac27a0ecSDave Kleikamp } 131ac27a0ecSDave Kleikamp 132ac27a0ecSDave Kleikamp /* 133ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 134ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 135ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 136ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 137ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 138ac27a0ecSDave Kleikamp * has been deleted earlier. 139ac27a0ecSDave Kleikamp * 140ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 141ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 142ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 143ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 144ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 145ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 146ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 147ac27a0ecSDave Kleikamp */ 148617ba13bSMingming Cao void ext4_free_inode (handle_t *handle, struct inode * inode) 149ac27a0ecSDave Kleikamp { 150ac27a0ecSDave Kleikamp struct super_block * sb = inode->i_sb; 151ac27a0ecSDave Kleikamp int is_directory; 152ac27a0ecSDave Kleikamp unsigned long ino; 153ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 154ac27a0ecSDave Kleikamp struct buffer_head *bh2; 155ac27a0ecSDave Kleikamp unsigned long block_group; 156ac27a0ecSDave Kleikamp unsigned long bit; 157617ba13bSMingming Cao struct ext4_group_desc * gdp; 158617ba13bSMingming Cao struct ext4_super_block * es; 159617ba13bSMingming Cao struct ext4_sb_info *sbi; 160ac27a0ecSDave Kleikamp int fatal = 0, err; 161ac27a0ecSDave Kleikamp 162ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 163617ba13bSMingming Cao printk ("ext4_free_inode: inode has count=%d\n", 164ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 165ac27a0ecSDave Kleikamp return; 166ac27a0ecSDave Kleikamp } 167ac27a0ecSDave Kleikamp if (inode->i_nlink) { 168617ba13bSMingming Cao printk ("ext4_free_inode: inode has nlink=%d\n", 169ac27a0ecSDave Kleikamp inode->i_nlink); 170ac27a0ecSDave Kleikamp return; 171ac27a0ecSDave Kleikamp } 172ac27a0ecSDave Kleikamp if (!sb) { 173617ba13bSMingming Cao printk("ext4_free_inode: inode on nonexistent device\n"); 174ac27a0ecSDave Kleikamp return; 175ac27a0ecSDave Kleikamp } 176617ba13bSMingming Cao sbi = EXT4_SB(sb); 177ac27a0ecSDave Kleikamp 178ac27a0ecSDave Kleikamp ino = inode->i_ino; 179617ba13bSMingming Cao ext4_debug ("freeing inode %lu\n", ino); 180ac27a0ecSDave Kleikamp 181ac27a0ecSDave Kleikamp /* 182ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 183ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 184ac27a0ecSDave Kleikamp */ 185ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 186617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 187ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 188ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 189ac27a0ecSDave Kleikamp 190ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 191ac27a0ecSDave Kleikamp 192ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 193ac27a0ecSDave Kleikamp clear_inode (inode); 194ac27a0ecSDave Kleikamp 195617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 196617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 197617ba13bSMingming Cao ext4_error (sb, "ext4_free_inode", 198ac27a0ecSDave Kleikamp "reserved or nonexistent inode %lu", ino); 199ac27a0ecSDave Kleikamp goto error_return; 200ac27a0ecSDave Kleikamp } 201617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 202617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 203ac27a0ecSDave Kleikamp bitmap_bh = read_inode_bitmap(sb, block_group); 204ac27a0ecSDave Kleikamp if (!bitmap_bh) 205ac27a0ecSDave Kleikamp goto error_return; 206ac27a0ecSDave Kleikamp 207ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 208617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 209ac27a0ecSDave Kleikamp if (fatal) 210ac27a0ecSDave Kleikamp goto error_return; 211ac27a0ecSDave Kleikamp 212ac27a0ecSDave Kleikamp /* Ok, now we can actually update the inode bitmaps.. */ 213617ba13bSMingming Cao if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), 214ac27a0ecSDave Kleikamp bit, bitmap_bh->b_data)) 215617ba13bSMingming Cao ext4_error (sb, "ext4_free_inode", 216ac27a0ecSDave Kleikamp "bit already cleared for inode %lu", ino); 217ac27a0ecSDave Kleikamp else { 218617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, block_group, &bh2); 219ac27a0ecSDave Kleikamp 220ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 221617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 222ac27a0ecSDave Kleikamp if (fatal) goto error_return; 223ac27a0ecSDave Kleikamp 224ac27a0ecSDave Kleikamp if (gdp) { 225ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, block_group)); 226ac27a0ecSDave Kleikamp gdp->bg_free_inodes_count = cpu_to_le16( 227ac27a0ecSDave Kleikamp le16_to_cpu(gdp->bg_free_inodes_count) + 1); 228ac27a0ecSDave Kleikamp if (is_directory) 229ac27a0ecSDave Kleikamp gdp->bg_used_dirs_count = cpu_to_le16( 230ac27a0ecSDave Kleikamp le16_to_cpu(gdp->bg_used_dirs_count) - 1); 231717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, 232717d50e4SAndreas Dilger block_group, gdp); 233ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, block_group)); 234ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_freeinodes_counter); 235ac27a0ecSDave Kleikamp if (is_directory) 236ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_dirs_counter); 237ac27a0ecSDave Kleikamp 238ac27a0ecSDave Kleikamp } 239617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 240617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 241ac27a0ecSDave Kleikamp if (!fatal) fatal = err; 242ac27a0ecSDave Kleikamp } 243617ba13bSMingming Cao BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata"); 244617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bitmap_bh); 245ac27a0ecSDave Kleikamp if (!fatal) 246ac27a0ecSDave Kleikamp fatal = err; 247ac27a0ecSDave Kleikamp sb->s_dirt = 1; 248ac27a0ecSDave Kleikamp error_return: 249ac27a0ecSDave Kleikamp brelse(bitmap_bh); 250617ba13bSMingming Cao ext4_std_error(sb, fatal); 251ac27a0ecSDave Kleikamp } 252ac27a0ecSDave Kleikamp 253ac27a0ecSDave Kleikamp /* 254ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 255ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 256ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 257ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 258ac27a0ecSDave Kleikamp * directories already is chosen. 259ac27a0ecSDave Kleikamp * 260ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory\'s block 261ac27a0ecSDave Kleikamp * group to find a free inode. 262ac27a0ecSDave Kleikamp */ 263ac27a0ecSDave Kleikamp static int find_group_dir(struct super_block *sb, struct inode *parent) 264ac27a0ecSDave Kleikamp { 265617ba13bSMingming Cao int ngroups = EXT4_SB(sb)->s_groups_count; 266ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 267617ba13bSMingming Cao struct ext4_group_desc *desc, *best_desc = NULL; 268ac27a0ecSDave Kleikamp int group, best_group = -1; 269ac27a0ecSDave Kleikamp 270617ba13bSMingming Cao freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter); 271ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 272ac27a0ecSDave Kleikamp 273ac27a0ecSDave Kleikamp for (group = 0; group < ngroups; group++) { 274ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 275ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 276ac27a0ecSDave Kleikamp continue; 277ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 278ac27a0ecSDave Kleikamp continue; 279ac27a0ecSDave Kleikamp if (!best_desc || 280ac27a0ecSDave Kleikamp (le16_to_cpu(desc->bg_free_blocks_count) > 281ac27a0ecSDave Kleikamp le16_to_cpu(best_desc->bg_free_blocks_count))) { 282ac27a0ecSDave Kleikamp best_group = group; 283ac27a0ecSDave Kleikamp best_desc = desc; 284ac27a0ecSDave Kleikamp } 285ac27a0ecSDave Kleikamp } 286ac27a0ecSDave Kleikamp return best_group; 287ac27a0ecSDave Kleikamp } 288ac27a0ecSDave Kleikamp 289ac27a0ecSDave Kleikamp /* 290ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 291ac27a0ecSDave Kleikamp * 292ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 293ac27a0ecSDave Kleikamp * 294ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 295ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 296ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 297ac27a0ecSDave Kleikamp * 298ac27a0ecSDave Kleikamp * For the rest rules look so: 299ac27a0ecSDave Kleikamp * 300ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 301ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 302ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 303ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 304ac27a0ecSDave Kleikamp * it's already running too large debt (max_debt). 305ac27a0ecSDave Kleikamp * Parent's group is prefered, if it doesn't satisfy these 306ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 307ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 308ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 309ac27a0ecSDave Kleikamp * 310ac27a0ecSDave Kleikamp * Debt is incremented each time we allocate a directory and decremented 311ac27a0ecSDave Kleikamp * when we allocate an inode, within 0--255. 312ac27a0ecSDave Kleikamp */ 313ac27a0ecSDave Kleikamp 314ac27a0ecSDave Kleikamp #define INODE_COST 64 315ac27a0ecSDave Kleikamp #define BLOCK_COST 256 316ac27a0ecSDave Kleikamp 317ac27a0ecSDave Kleikamp static int find_group_orlov(struct super_block *sb, struct inode *parent) 318ac27a0ecSDave Kleikamp { 319617ba13bSMingming Cao int parent_group = EXT4_I(parent)->i_block_group; 320617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 321617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 322ac27a0ecSDave Kleikamp int ngroups = sbi->s_groups_count; 323617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 324ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 325617ba13bSMingming Cao ext4_fsblk_t freeb, avefreeb; 326617ba13bSMingming Cao ext4_fsblk_t blocks_per_dir; 327ac27a0ecSDave Kleikamp unsigned int ndirs; 328ac27a0ecSDave Kleikamp int max_debt, max_dirs, min_inodes; 329617ba13bSMingming Cao ext4_grpblk_t min_blocks; 330ac27a0ecSDave Kleikamp int group = -1, i; 331617ba13bSMingming Cao struct ext4_group_desc *desc; 332ac27a0ecSDave Kleikamp 333ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 334ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 335ac27a0ecSDave Kleikamp freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); 3363a5b2ecdSMingming Cao avefreeb = freeb; 337f4e5bc24SAndrew Morton do_div(avefreeb, ngroups); 338ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 339ac27a0ecSDave Kleikamp 340ac27a0ecSDave Kleikamp if ((parent == sb->s_root->d_inode) || 341617ba13bSMingming Cao (EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) { 342ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 343ac27a0ecSDave Kleikamp int best_group = -1; 344ac27a0ecSDave Kleikamp 345ac27a0ecSDave Kleikamp get_random_bytes(&group, sizeof(group)); 346ac27a0ecSDave Kleikamp parent_group = (unsigned)group % ngroups; 347ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 348ac27a0ecSDave Kleikamp group = (parent_group + i) % ngroups; 349ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 350ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 351ac27a0ecSDave Kleikamp continue; 352ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) 353ac27a0ecSDave Kleikamp continue; 354ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 355ac27a0ecSDave Kleikamp continue; 356ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) 357ac27a0ecSDave Kleikamp continue; 358ac27a0ecSDave Kleikamp best_group = group; 359ac27a0ecSDave Kleikamp best_ndir = le16_to_cpu(desc->bg_used_dirs_count); 360ac27a0ecSDave Kleikamp } 361ac27a0ecSDave Kleikamp if (best_group >= 0) 362ac27a0ecSDave Kleikamp return best_group; 363ac27a0ecSDave Kleikamp goto fallback; 364ac27a0ecSDave Kleikamp } 365ac27a0ecSDave Kleikamp 366bd81d8eeSLaurent Vivier blocks_per_dir = ext4_blocks_count(es) - freeb; 367f4e5bc24SAndrew Morton do_div(blocks_per_dir, ndirs); 368ac27a0ecSDave Kleikamp 369ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 370ac27a0ecSDave Kleikamp min_inodes = avefreei - inodes_per_group / 4; 371617ba13bSMingming Cao min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4; 372ac27a0ecSDave Kleikamp 3733a5b2ecdSMingming Cao max_debt = EXT4_BLOCKS_PER_GROUP(sb); 374f4e5bc24SAndrew Morton max_debt /= max_t(int, blocks_per_dir, BLOCK_COST); 375ac27a0ecSDave Kleikamp if (max_debt * INODE_COST > inodes_per_group) 376ac27a0ecSDave Kleikamp max_debt = inodes_per_group / INODE_COST; 377ac27a0ecSDave Kleikamp if (max_debt > 255) 378ac27a0ecSDave Kleikamp max_debt = 255; 379ac27a0ecSDave Kleikamp if (max_debt == 0) 380ac27a0ecSDave Kleikamp max_debt = 1; 381ac27a0ecSDave Kleikamp 382ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 383ac27a0ecSDave Kleikamp group = (parent_group + i) % ngroups; 384ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 385ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 386ac27a0ecSDave Kleikamp continue; 387ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) 388ac27a0ecSDave Kleikamp continue; 389ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) 390ac27a0ecSDave Kleikamp continue; 391ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) 392ac27a0ecSDave Kleikamp continue; 393ac27a0ecSDave Kleikamp return group; 394ac27a0ecSDave Kleikamp } 395ac27a0ecSDave Kleikamp 396ac27a0ecSDave Kleikamp fallback: 397ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 398ac27a0ecSDave Kleikamp group = (parent_group + i) % ngroups; 399ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 400ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 401ac27a0ecSDave Kleikamp continue; 402ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) 403ac27a0ecSDave Kleikamp return group; 404ac27a0ecSDave Kleikamp } 405ac27a0ecSDave Kleikamp 406ac27a0ecSDave Kleikamp if (avefreei) { 407ac27a0ecSDave Kleikamp /* 408ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 409ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 410ac27a0ecSDave Kleikamp */ 411ac27a0ecSDave Kleikamp avefreei = 0; 412ac27a0ecSDave Kleikamp goto fallback; 413ac27a0ecSDave Kleikamp } 414ac27a0ecSDave Kleikamp 415ac27a0ecSDave Kleikamp return -1; 416ac27a0ecSDave Kleikamp } 417ac27a0ecSDave Kleikamp 418ac27a0ecSDave Kleikamp static int find_group_other(struct super_block *sb, struct inode *parent) 419ac27a0ecSDave Kleikamp { 420617ba13bSMingming Cao int parent_group = EXT4_I(parent)->i_block_group; 421617ba13bSMingming Cao int ngroups = EXT4_SB(sb)->s_groups_count; 422617ba13bSMingming Cao struct ext4_group_desc *desc; 423ac27a0ecSDave Kleikamp int group, i; 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp /* 426ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 427ac27a0ecSDave Kleikamp */ 428ac27a0ecSDave Kleikamp group = parent_group; 429ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 430ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 431ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 432ac27a0ecSDave Kleikamp return group; 433ac27a0ecSDave Kleikamp 434ac27a0ecSDave Kleikamp /* 435ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 436ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 437ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 438ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 439ac27a0ecSDave Kleikamp * different blockgroup. 440ac27a0ecSDave Kleikamp * 441ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 442ac27a0ecSDave Kleikamp */ 443ac27a0ecSDave Kleikamp group = (group + parent->i_ino) % ngroups; 444ac27a0ecSDave Kleikamp 445ac27a0ecSDave Kleikamp /* 446ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 447ac27a0ecSDave Kleikamp * blocks. 448ac27a0ecSDave Kleikamp */ 449ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 450ac27a0ecSDave Kleikamp group += i; 451ac27a0ecSDave Kleikamp if (group >= ngroups) 452ac27a0ecSDave Kleikamp group -= ngroups; 453ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 454ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 455ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 456ac27a0ecSDave Kleikamp return group; 457ac27a0ecSDave Kleikamp } 458ac27a0ecSDave Kleikamp 459ac27a0ecSDave Kleikamp /* 460ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 461ac27a0ecSDave Kleikamp * has no free blocks. 462ac27a0ecSDave Kleikamp */ 463ac27a0ecSDave Kleikamp group = parent_group; 464ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 465ac27a0ecSDave Kleikamp if (++group >= ngroups) 466ac27a0ecSDave Kleikamp group = 0; 467ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 468ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count)) 469ac27a0ecSDave Kleikamp return group; 470ac27a0ecSDave Kleikamp } 471ac27a0ecSDave Kleikamp 472ac27a0ecSDave Kleikamp return -1; 473ac27a0ecSDave Kleikamp } 474ac27a0ecSDave Kleikamp 475ac27a0ecSDave Kleikamp /* 476ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 477ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 478ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 479ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 480ac27a0ecSDave Kleikamp * directories already is chosen. 481ac27a0ecSDave Kleikamp * 482ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 483ac27a0ecSDave Kleikamp * group to find a free inode. 484ac27a0ecSDave Kleikamp */ 485617ba13bSMingming Cao struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode) 486ac27a0ecSDave Kleikamp { 487ac27a0ecSDave Kleikamp struct super_block *sb; 488ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 489ac27a0ecSDave Kleikamp struct buffer_head *bh2; 490ac27a0ecSDave Kleikamp int group; 491ac27a0ecSDave Kleikamp unsigned long ino = 0; 492ac27a0ecSDave Kleikamp struct inode * inode; 493617ba13bSMingming Cao struct ext4_group_desc * gdp = NULL; 494617ba13bSMingming Cao struct ext4_super_block * es; 495617ba13bSMingming Cao struct ext4_inode_info *ei; 496617ba13bSMingming Cao struct ext4_sb_info *sbi; 497ac27a0ecSDave Kleikamp int err = 0; 498ac27a0ecSDave Kleikamp struct inode *ret; 499717d50e4SAndreas Dilger int i, free = 0; 500ac27a0ecSDave Kleikamp 501ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 502ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 503ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 504ac27a0ecSDave Kleikamp 505ac27a0ecSDave Kleikamp sb = dir->i_sb; 506ac27a0ecSDave Kleikamp inode = new_inode(sb); 507ac27a0ecSDave Kleikamp if (!inode) 508ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 509617ba13bSMingming Cao ei = EXT4_I(inode); 510ac27a0ecSDave Kleikamp 511617ba13bSMingming Cao sbi = EXT4_SB(sb); 512ac27a0ecSDave Kleikamp es = sbi->s_es; 513ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 514ac27a0ecSDave Kleikamp if (test_opt (sb, OLDALLOC)) 515ac27a0ecSDave Kleikamp group = find_group_dir(sb, dir); 516ac27a0ecSDave Kleikamp else 517ac27a0ecSDave Kleikamp group = find_group_orlov(sb, dir); 518ac27a0ecSDave Kleikamp } else 519ac27a0ecSDave Kleikamp group = find_group_other(sb, dir); 520ac27a0ecSDave Kleikamp 521ac27a0ecSDave Kleikamp err = -ENOSPC; 522ac27a0ecSDave Kleikamp if (group == -1) 523ac27a0ecSDave Kleikamp goto out; 524ac27a0ecSDave Kleikamp 525ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_groups_count; i++) { 526ac27a0ecSDave Kleikamp err = -EIO; 527ac27a0ecSDave Kleikamp 528617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, group, &bh2); 529ac27a0ecSDave Kleikamp if (!gdp) 530ac27a0ecSDave Kleikamp goto fail; 531ac27a0ecSDave Kleikamp 532ac27a0ecSDave Kleikamp brelse(bitmap_bh); 533ac27a0ecSDave Kleikamp bitmap_bh = read_inode_bitmap(sb, group); 534ac27a0ecSDave Kleikamp if (!bitmap_bh) 535ac27a0ecSDave Kleikamp goto fail; 536ac27a0ecSDave Kleikamp 537ac27a0ecSDave Kleikamp ino = 0; 538ac27a0ecSDave Kleikamp 539ac27a0ecSDave Kleikamp repeat_in_this_group: 540617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 541617ba13bSMingming Cao bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino); 542617ba13bSMingming Cao if (ino < EXT4_INODES_PER_GROUP(sb)) { 543ac27a0ecSDave Kleikamp 544ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 545617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bitmap_bh); 546ac27a0ecSDave Kleikamp if (err) 547ac27a0ecSDave Kleikamp goto fail; 548ac27a0ecSDave Kleikamp 549617ba13bSMingming Cao if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group), 550ac27a0ecSDave Kleikamp ino, bitmap_bh->b_data)) { 551ac27a0ecSDave Kleikamp /* we won it */ 552ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, 553617ba13bSMingming Cao "call ext4_journal_dirty_metadata"); 554617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, 555ac27a0ecSDave Kleikamp bitmap_bh); 556ac27a0ecSDave Kleikamp if (err) 557ac27a0ecSDave Kleikamp goto fail; 558ac27a0ecSDave Kleikamp goto got; 559ac27a0ecSDave Kleikamp } 560ac27a0ecSDave Kleikamp /* we lost it */ 561dab291afSMingming Cao jbd2_journal_release_buffer(handle, bitmap_bh); 562ac27a0ecSDave Kleikamp 563617ba13bSMingming Cao if (++ino < EXT4_INODES_PER_GROUP(sb)) 564ac27a0ecSDave Kleikamp goto repeat_in_this_group; 565ac27a0ecSDave Kleikamp } 566ac27a0ecSDave Kleikamp 567ac27a0ecSDave Kleikamp /* 568ac27a0ecSDave Kleikamp * This case is possible in concurrent environment. It is very 569ac27a0ecSDave Kleikamp * rare. We cannot repeat the find_group_xxx() call because 570ac27a0ecSDave Kleikamp * that will simply return the same blockgroup, because the 571ac27a0ecSDave Kleikamp * group descriptor metadata has not yet been updated. 572ac27a0ecSDave Kleikamp * So we just go onto the next blockgroup. 573ac27a0ecSDave Kleikamp */ 574ac27a0ecSDave Kleikamp if (++group == sbi->s_groups_count) 575ac27a0ecSDave Kleikamp group = 0; 576ac27a0ecSDave Kleikamp } 577ac27a0ecSDave Kleikamp err = -ENOSPC; 578ac27a0ecSDave Kleikamp goto out; 579ac27a0ecSDave Kleikamp 580ac27a0ecSDave Kleikamp got: 581717d50e4SAndreas Dilger ino++; 582717d50e4SAndreas Dilger if ((group == 0 && ino < EXT4_FIRST_INO(sb)) || 583717d50e4SAndreas Dilger ino > EXT4_INODES_PER_GROUP(sb)) { 584717d50e4SAndreas Dilger ext4_error(sb, __FUNCTION__, 585ac27a0ecSDave Kleikamp "reserved inode or inode > inodes count - " 586717d50e4SAndreas Dilger "block_group = %d, inode=%lu", group, 587717d50e4SAndreas Dilger ino + group * EXT4_INODES_PER_GROUP(sb)); 588ac27a0ecSDave Kleikamp err = -EIO; 589ac27a0ecSDave Kleikamp goto fail; 590ac27a0ecSDave Kleikamp } 591ac27a0ecSDave Kleikamp 592ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 593617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh2); 594ac27a0ecSDave Kleikamp if (err) goto fail; 595717d50e4SAndreas Dilger 596717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 597717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 598717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 599717d50e4SAndreas Dilger struct buffer_head *block_bh = read_block_bitmap(sb, group); 600717d50e4SAndreas Dilger 601717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "get block bitmap access"); 602717d50e4SAndreas Dilger err = ext4_journal_get_write_access(handle, block_bh); 603717d50e4SAndreas Dilger if (err) { 604717d50e4SAndreas Dilger brelse(block_bh); 605717d50e4SAndreas Dilger goto fail; 606717d50e4SAndreas Dilger } 607717d50e4SAndreas Dilger 608717d50e4SAndreas Dilger free = 0; 609ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, group)); 610717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 611717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 612717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 613717d50e4SAndreas Dilger free = ext4_free_blocks_after_init(sb, group, gdp); 614717d50e4SAndreas Dilger gdp->bg_free_blocks_count = cpu_to_le16(free); 615717d50e4SAndreas Dilger } 616717d50e4SAndreas Dilger spin_unlock(sb_bgl_lock(sbi, group)); 617717d50e4SAndreas Dilger 618717d50e4SAndreas Dilger /* Don't need to dirty bitmap block if we didn't change it */ 619717d50e4SAndreas Dilger if (free) { 620717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "dirty block bitmap"); 621717d50e4SAndreas Dilger err = ext4_journal_dirty_metadata(handle, block_bh); 622717d50e4SAndreas Dilger } 623717d50e4SAndreas Dilger 624717d50e4SAndreas Dilger brelse(block_bh); 625717d50e4SAndreas Dilger if (err) 626717d50e4SAndreas Dilger goto fail; 627717d50e4SAndreas Dilger } 628717d50e4SAndreas Dilger 629717d50e4SAndreas Dilger spin_lock(sb_bgl_lock(sbi, group)); 630717d50e4SAndreas Dilger /* If we didn't allocate from within the initialized part of the inode 631717d50e4SAndreas Dilger * table then we need to initialize up to this inode. */ 632717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 633717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 634717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 635717d50e4SAndreas Dilger 636717d50e4SAndreas Dilger /* When marking the block group with 637717d50e4SAndreas Dilger * ~EXT4_BG_INODE_UNINIT we don't want to depend 638717d50e4SAndreas Dilger * on the value of bg_itable_unsed even though 639717d50e4SAndreas Dilger * mke2fs could have initialized the same for us. 640717d50e4SAndreas Dilger * Instead we calculated the value below 641717d50e4SAndreas Dilger */ 642717d50e4SAndreas Dilger 643717d50e4SAndreas Dilger free = 0; 644717d50e4SAndreas Dilger } else { 645717d50e4SAndreas Dilger free = EXT4_INODES_PER_GROUP(sb) - 646717d50e4SAndreas Dilger le16_to_cpu(gdp->bg_itable_unused); 647717d50e4SAndreas Dilger } 648717d50e4SAndreas Dilger 649717d50e4SAndreas Dilger /* 650717d50e4SAndreas Dilger * Check the relative inode number against the last used 651717d50e4SAndreas Dilger * relative inode number in this group. if it is greater 652717d50e4SAndreas Dilger * we need to update the bg_itable_unused count 653717d50e4SAndreas Dilger * 654717d50e4SAndreas Dilger */ 655717d50e4SAndreas Dilger if (ino > free) 656717d50e4SAndreas Dilger gdp->bg_itable_unused = 657717d50e4SAndreas Dilger cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino); 658717d50e4SAndreas Dilger } 659717d50e4SAndreas Dilger 660ac27a0ecSDave Kleikamp gdp->bg_free_inodes_count = 661ac27a0ecSDave Kleikamp cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1); 662ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 663ac27a0ecSDave Kleikamp gdp->bg_used_dirs_count = 664ac27a0ecSDave Kleikamp cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1); 665ac27a0ecSDave Kleikamp } 666717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 667ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, group)); 668617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 669617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 670ac27a0ecSDave Kleikamp if (err) goto fail; 671ac27a0ecSDave Kleikamp 672ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 673ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 674ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 675ac27a0ecSDave Kleikamp sb->s_dirt = 1; 676ac27a0ecSDave Kleikamp 677ac27a0ecSDave Kleikamp inode->i_uid = current->fsuid; 678ac27a0ecSDave Kleikamp if (test_opt (sb, GRPID)) 679ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 680ac27a0ecSDave Kleikamp else if (dir->i_mode & S_ISGID) { 681ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 682ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 683ac27a0ecSDave Kleikamp mode |= S_ISGID; 684ac27a0ecSDave Kleikamp } else 685ac27a0ecSDave Kleikamp inode->i_gid = current->fsgid; 686ac27a0ecSDave Kleikamp inode->i_mode = mode; 687ac27a0ecSDave Kleikamp 688717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 689ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 690ac27a0ecSDave Kleikamp inode->i_blocks = 0; 691ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 692ef7f3835SKalpak Shah ext4_current_time(inode); 693ac27a0ecSDave Kleikamp 694ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 695ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 696ac27a0ecSDave Kleikamp ei->i_disksize = 0; 697ac27a0ecSDave Kleikamp 698617ba13bSMingming Cao ei->i_flags = EXT4_I(dir)->i_flags & ~EXT4_INDEX_FL; 699ac27a0ecSDave Kleikamp if (S_ISLNK(mode)) 700617ba13bSMingming Cao ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL); 701ac27a0ecSDave Kleikamp /* dirsync only applies to directories */ 702ac27a0ecSDave Kleikamp if (!S_ISDIR(mode)) 703617ba13bSMingming Cao ei->i_flags &= ~EXT4_DIRSYNC_FL; 704ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 705ac27a0ecSDave Kleikamp ei->i_dir_acl = 0; 706ac27a0ecSDave Kleikamp ei->i_dtime = 0; 707ac27a0ecSDave Kleikamp ei->i_block_alloc_info = NULL; 708ac27a0ecSDave Kleikamp ei->i_block_group = group; 709ac27a0ecSDave Kleikamp 710617ba13bSMingming Cao ext4_set_inode_flags(inode); 711ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 712ac27a0ecSDave Kleikamp handle->h_sync = 1; 713ac27a0ecSDave Kleikamp insert_inode_hash(inode); 714ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 715ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 716ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 717ac27a0ecSDave Kleikamp 718617ba13bSMingming Cao ei->i_state = EXT4_STATE_NEW; 719ef7f3835SKalpak Shah 720ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 721ac27a0ecSDave Kleikamp 722ac27a0ecSDave Kleikamp ret = inode; 723ac27a0ecSDave Kleikamp if(DQUOT_ALLOC_INODE(inode)) { 724ac27a0ecSDave Kleikamp err = -EDQUOT; 725ac27a0ecSDave Kleikamp goto fail_drop; 726ac27a0ecSDave Kleikamp } 727ac27a0ecSDave Kleikamp 728617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 729ac27a0ecSDave Kleikamp if (err) 730ac27a0ecSDave Kleikamp goto fail_free_drop; 731ac27a0ecSDave Kleikamp 732617ba13bSMingming Cao err = ext4_init_security(handle,inode, dir); 733ac27a0ecSDave Kleikamp if (err) 734ac27a0ecSDave Kleikamp goto fail_free_drop; 735ac27a0ecSDave Kleikamp 736617ba13bSMingming Cao err = ext4_mark_inode_dirty(handle, inode); 737ac27a0ecSDave Kleikamp if (err) { 738617ba13bSMingming Cao ext4_std_error(sb, err); 739ac27a0ecSDave Kleikamp goto fail_free_drop; 740ac27a0ecSDave Kleikamp } 741a86c6181SAlex Tomas if (test_opt(sb, EXTENTS)) { 742a86c6181SAlex Tomas EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL; 743a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 744a86c6181SAlex Tomas if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 745a86c6181SAlex Tomas err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); 746a86c6181SAlex Tomas if (err) goto fail; 747a86c6181SAlex Tomas EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS); 748a86c6181SAlex Tomas BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata"); 749a86c6181SAlex Tomas err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh); 750a86c6181SAlex Tomas } 751a86c6181SAlex Tomas } 752ac27a0ecSDave Kleikamp 753617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 754ac27a0ecSDave Kleikamp goto really_out; 755ac27a0ecSDave Kleikamp fail: 756617ba13bSMingming Cao ext4_std_error(sb, err); 757ac27a0ecSDave Kleikamp out: 758ac27a0ecSDave Kleikamp iput(inode); 759ac27a0ecSDave Kleikamp ret = ERR_PTR(err); 760ac27a0ecSDave Kleikamp really_out: 761ac27a0ecSDave Kleikamp brelse(bitmap_bh); 762ac27a0ecSDave Kleikamp return ret; 763ac27a0ecSDave Kleikamp 764ac27a0ecSDave Kleikamp fail_free_drop: 765ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 766ac27a0ecSDave Kleikamp 767ac27a0ecSDave Kleikamp fail_drop: 768ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 769ac27a0ecSDave Kleikamp inode->i_flags |= S_NOQUOTA; 770ac27a0ecSDave Kleikamp inode->i_nlink = 0; 771ac27a0ecSDave Kleikamp iput(inode); 772ac27a0ecSDave Kleikamp brelse(bitmap_bh); 773ac27a0ecSDave Kleikamp return ERR_PTR(err); 774ac27a0ecSDave Kleikamp } 775ac27a0ecSDave Kleikamp 776ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 777617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 778ac27a0ecSDave Kleikamp { 779617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 780ac27a0ecSDave Kleikamp unsigned long block_group; 781ac27a0ecSDave Kleikamp int bit; 782ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 783ac27a0ecSDave Kleikamp struct inode *inode = NULL; 784ac27a0ecSDave Kleikamp 785ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 786ac27a0ecSDave Kleikamp if (ino > max_ino) { 787617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, 788ac27a0ecSDave Kleikamp "bad orphan ino %lu! e2fsck was run?", ino); 789ac27a0ecSDave Kleikamp goto out; 790ac27a0ecSDave Kleikamp } 791ac27a0ecSDave Kleikamp 792617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 793617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 794ac27a0ecSDave Kleikamp bitmap_bh = read_inode_bitmap(sb, block_group); 795ac27a0ecSDave Kleikamp if (!bitmap_bh) { 796617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, 797ac27a0ecSDave Kleikamp "inode bitmap error for orphan %lu", ino); 798ac27a0ecSDave Kleikamp goto out; 799ac27a0ecSDave Kleikamp } 800ac27a0ecSDave Kleikamp 801ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 802ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 803ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 804ac27a0ecSDave Kleikamp */ 805617ba13bSMingming Cao if (!ext4_test_bit(bit, bitmap_bh->b_data) || 806ac27a0ecSDave Kleikamp !(inode = iget(sb, ino)) || is_bad_inode(inode) || 807ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode) > max_ino) { 808617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, 809ac27a0ecSDave Kleikamp "bad orphan inode %lu! e2fsck was run?", ino); 810617ba13bSMingming Cao printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n", 811ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 812617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 813ac27a0ecSDave Kleikamp printk(KERN_NOTICE "inode=%p\n", inode); 814ac27a0ecSDave Kleikamp if (inode) { 815ac27a0ecSDave Kleikamp printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", 816ac27a0ecSDave Kleikamp is_bad_inode(inode)); 817ac27a0ecSDave Kleikamp printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", 818ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 819ac27a0ecSDave Kleikamp printk(KERN_NOTICE "max_ino=%lu\n", max_ino); 820ac27a0ecSDave Kleikamp } 821ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 822ac27a0ecSDave Kleikamp if (inode && inode->i_nlink == 0) 823ac27a0ecSDave Kleikamp inode->i_blocks = 0; 824ac27a0ecSDave Kleikamp iput(inode); 825ac27a0ecSDave Kleikamp inode = NULL; 826ac27a0ecSDave Kleikamp } 827ac27a0ecSDave Kleikamp out: 828ac27a0ecSDave Kleikamp brelse(bitmap_bh); 829ac27a0ecSDave Kleikamp return inode; 830ac27a0ecSDave Kleikamp } 831ac27a0ecSDave Kleikamp 832617ba13bSMingming Cao unsigned long ext4_count_free_inodes (struct super_block * sb) 833ac27a0ecSDave Kleikamp { 834ac27a0ecSDave Kleikamp unsigned long desc_count; 835617ba13bSMingming Cao struct ext4_group_desc *gdp; 836ac27a0ecSDave Kleikamp int i; 837617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 838617ba13bSMingming Cao struct ext4_super_block *es; 839ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 840ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 841ac27a0ecSDave Kleikamp 842617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 843ac27a0ecSDave Kleikamp desc_count = 0; 844ac27a0ecSDave Kleikamp bitmap_count = 0; 845ac27a0ecSDave Kleikamp gdp = NULL; 846617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 847617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, i, NULL); 848ac27a0ecSDave Kleikamp if (!gdp) 849ac27a0ecSDave Kleikamp continue; 850ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 851ac27a0ecSDave Kleikamp brelse(bitmap_bh); 852ac27a0ecSDave Kleikamp bitmap_bh = read_inode_bitmap(sb, i); 853ac27a0ecSDave Kleikamp if (!bitmap_bh) 854ac27a0ecSDave Kleikamp continue; 855ac27a0ecSDave Kleikamp 856617ba13bSMingming Cao x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8); 857ac27a0ecSDave Kleikamp printk("group %d: stored = %d, counted = %lu\n", 858ac27a0ecSDave Kleikamp i, le16_to_cpu(gdp->bg_free_inodes_count), x); 859ac27a0ecSDave Kleikamp bitmap_count += x; 860ac27a0ecSDave Kleikamp } 861ac27a0ecSDave Kleikamp brelse(bitmap_bh); 862617ba13bSMingming Cao printk("ext4_count_free_inodes: stored = %u, computed = %lu, %lu\n", 863ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 864ac27a0ecSDave Kleikamp return desc_count; 865ac27a0ecSDave Kleikamp #else 866ac27a0ecSDave Kleikamp desc_count = 0; 867617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 868617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, i, NULL); 869ac27a0ecSDave Kleikamp if (!gdp) 870ac27a0ecSDave Kleikamp continue; 871ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 872ac27a0ecSDave Kleikamp cond_resched(); 873ac27a0ecSDave Kleikamp } 874ac27a0ecSDave Kleikamp return desc_count; 875ac27a0ecSDave Kleikamp #endif 876ac27a0ecSDave Kleikamp } 877ac27a0ecSDave Kleikamp 878ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 879617ba13bSMingming Cao unsigned long ext4_count_dirs (struct super_block * sb) 880ac27a0ecSDave Kleikamp { 881ac27a0ecSDave Kleikamp unsigned long count = 0; 882ac27a0ecSDave Kleikamp int i; 883ac27a0ecSDave Kleikamp 884617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 885617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL); 886ac27a0ecSDave Kleikamp if (!gdp) 887ac27a0ecSDave Kleikamp continue; 888ac27a0ecSDave Kleikamp count += le16_to_cpu(gdp->bg_used_dirs_count); 889ac27a0ecSDave Kleikamp } 890ac27a0ecSDave Kleikamp return count; 891ac27a0ecSDave Kleikamp } 892ac27a0ecSDave Kleikamp 893