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> 18ac27a0ecSDave Kleikamp #include <linux/stat.h> 19ac27a0ecSDave Kleikamp #include <linux/string.h> 20ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 21ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 22ac27a0ecSDave Kleikamp #include <linux/random.h> 23ac27a0ecSDave Kleikamp #include <linux/bitops.h> 243a5b2ecdSMingming Cao #include <linux/blkdev.h> 25ac27a0ecSDave Kleikamp #include <asm/byteorder.h> 269bffad1eSTheodore Ts'o 273dcf5451SChristoph Hellwig #include "ext4.h" 283dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 29ac27a0ecSDave Kleikamp #include "xattr.h" 30ac27a0ecSDave Kleikamp #include "acl.h" 31ac27a0ecSDave Kleikamp 329bffad1eSTheodore Ts'o #include <trace/events/ext4.h> 339bffad1eSTheodore Ts'o 34ac27a0ecSDave Kleikamp /* 35ac27a0ecSDave Kleikamp * ialloc.c contains the inodes allocation and deallocation routines 36ac27a0ecSDave Kleikamp */ 37ac27a0ecSDave Kleikamp 38ac27a0ecSDave Kleikamp /* 39ac27a0ecSDave Kleikamp * The free inodes are managed by bitmaps. A file system contains several 40ac27a0ecSDave Kleikamp * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap 41ac27a0ecSDave Kleikamp * block for inodes, N blocks for the inode table and data blocks. 42ac27a0ecSDave Kleikamp * 43ac27a0ecSDave Kleikamp * The file system contains group descriptors which are located after the 44ac27a0ecSDave Kleikamp * super block. Each descriptor contains the number of the bitmap block and 45ac27a0ecSDave Kleikamp * the free blocks count in the block. 46ac27a0ecSDave Kleikamp */ 47ac27a0ecSDave Kleikamp 48717d50e4SAndreas Dilger /* 49717d50e4SAndreas Dilger * To avoid calling the atomic setbit hundreds or thousands of times, we only 50717d50e4SAndreas Dilger * need to use it within a single byte (to ensure we get endianness right). 51717d50e4SAndreas Dilger * We can use memset for the rest of the bitmap as there are no other users. 52717d50e4SAndreas Dilger */ 5361d08673STheodore Ts'o void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) 54717d50e4SAndreas Dilger { 55717d50e4SAndreas Dilger int i; 56717d50e4SAndreas Dilger 57717d50e4SAndreas Dilger if (start_bit >= end_bit) 58717d50e4SAndreas Dilger return; 59717d50e4SAndreas Dilger 60717d50e4SAndreas Dilger ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); 61717d50e4SAndreas Dilger for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) 62717d50e4SAndreas Dilger ext4_set_bit(i, bitmap); 63717d50e4SAndreas Dilger if (i < end_bit) 64717d50e4SAndreas Dilger memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); 65717d50e4SAndreas Dilger } 66717d50e4SAndreas Dilger 67717d50e4SAndreas Dilger /* Initializes an uninitialized inode bitmap */ 681f109d5aSTheodore Ts'o static unsigned ext4_init_inode_bitmap(struct super_block *sb, 691f109d5aSTheodore Ts'o struct buffer_head *bh, 70fd2d4291SAvantika Mathur ext4_group_t block_group, 71717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 72717d50e4SAndreas Dilger { 73717d50e4SAndreas Dilger struct ext4_sb_info *sbi = EXT4_SB(sb); 74717d50e4SAndreas Dilger 75717d50e4SAndreas Dilger J_ASSERT_BH(bh, buffer_locked(bh)); 76717d50e4SAndreas Dilger 77717d50e4SAndreas Dilger /* If checksum is bad mark all blocks and inodes use to prevent 78717d50e4SAndreas Dilger * allocation, essentially implementing a per-group read-only flag. */ 79717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { 8012062dddSEric Sandeen ext4_error(sb, "Checksum bad for group %u", block_group); 81021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 0); 82560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, 0); 83560671a0SAneesh Kumar K.V ext4_itable_unused_set(sb, gdp, 0); 84717d50e4SAndreas Dilger memset(bh->b_data, 0xff, sb->s_blocksize); 85717d50e4SAndreas Dilger return 0; 86717d50e4SAndreas Dilger } 87717d50e4SAndreas Dilger 88717d50e4SAndreas Dilger memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 8961d08673STheodore Ts'o ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, 90717d50e4SAndreas Dilger bh->b_data); 91717d50e4SAndreas Dilger 92717d50e4SAndreas Dilger return EXT4_INODES_PER_GROUP(sb); 93717d50e4SAndreas Dilger } 94ac27a0ecSDave Kleikamp 95813e5727STheodore Ts'o void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) 96813e5727STheodore Ts'o { 97813e5727STheodore Ts'o if (uptodate) { 98813e5727STheodore Ts'o set_buffer_uptodate(bh); 99813e5727STheodore Ts'o set_bitmap_uptodate(bh); 100813e5727STheodore Ts'o } 101813e5727STheodore Ts'o unlock_buffer(bh); 102813e5727STheodore Ts'o put_bh(bh); 103813e5727STheodore Ts'o } 104813e5727STheodore Ts'o 105ac27a0ecSDave Kleikamp /* 106ac27a0ecSDave Kleikamp * Read the inode allocation bitmap for a given block_group, reading 107ac27a0ecSDave Kleikamp * into the specified slot in the superblock's bitmap cache. 108ac27a0ecSDave Kleikamp * 109ac27a0ecSDave Kleikamp * Return buffer_head of bitmap on success or NULL. 110ac27a0ecSDave Kleikamp */ 111ac27a0ecSDave Kleikamp static struct buffer_head * 112e29d1cdeSEric Sandeen ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) 113ac27a0ecSDave Kleikamp { 114617ba13bSMingming Cao struct ext4_group_desc *desc; 115ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 116e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 117ac27a0ecSDave Kleikamp 118617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 119ac27a0ecSDave Kleikamp if (!desc) 120e29d1cdeSEric Sandeen return NULL; 121bfff6873SLukas Czerner 122e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 123e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 124e29d1cdeSEric Sandeen if (unlikely(!bh)) { 12512062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 126a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 127e29d1cdeSEric Sandeen block_group, bitmap_blk); 128e29d1cdeSEric Sandeen return NULL; 129e29d1cdeSEric Sandeen } 1302ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) 131e29d1cdeSEric Sandeen return bh; 132e29d1cdeSEric Sandeen 133c806e68fSFrederic Bohe lock_buffer(bh); 1342ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) { 1352ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 1362ccb5fb9SAneesh Kumar K.V return bh; 1372ccb5fb9SAneesh Kumar K.V } 138bfff6873SLukas Czerner 139955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 140e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 141e29d1cdeSEric Sandeen ext4_init_inode_bitmap(sb, bh, block_group, desc); 1422ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 143e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 144955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 1453300bedaSAneesh Kumar K.V unlock_buffer(bh); 146e29d1cdeSEric Sandeen return bh; 147e29d1cdeSEric Sandeen } 148955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 149bfff6873SLukas Czerner 1502ccb5fb9SAneesh Kumar K.V if (buffer_uptodate(bh)) { 1512ccb5fb9SAneesh Kumar K.V /* 1522ccb5fb9SAneesh Kumar K.V * if not uninit if bh is uptodate, 1532ccb5fb9SAneesh Kumar K.V * bitmap is also uptodate 1542ccb5fb9SAneesh Kumar K.V */ 1552ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 1562ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 1572ccb5fb9SAneesh Kumar K.V return bh; 1582ccb5fb9SAneesh Kumar K.V } 1592ccb5fb9SAneesh Kumar K.V /* 160813e5727STheodore Ts'o * submit the buffer_head for reading 1612ccb5fb9SAneesh Kumar K.V */ 1620562e0baSJiaying Zhang trace_ext4_load_inode_bitmap(sb, block_group); 163813e5727STheodore Ts'o bh->b_end_io = ext4_end_bitmap_read; 164813e5727STheodore Ts'o get_bh(bh); 165813e5727STheodore Ts'o submit_bh(READ, bh); 166813e5727STheodore Ts'o wait_on_buffer(bh); 167813e5727STheodore Ts'o if (!buffer_uptodate(bh)) { 168e29d1cdeSEric Sandeen put_bh(bh); 16912062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 170a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 171e29d1cdeSEric Sandeen block_group, bitmap_blk); 172e29d1cdeSEric Sandeen return NULL; 173e29d1cdeSEric Sandeen } 174ac27a0ecSDave Kleikamp return bh; 175ac27a0ecSDave Kleikamp } 176ac27a0ecSDave Kleikamp 177ac27a0ecSDave Kleikamp /* 178ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 179ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 180ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 181ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 182ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 183ac27a0ecSDave Kleikamp * has been deleted earlier. 184ac27a0ecSDave Kleikamp * 185ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 186ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 187ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 188ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 189ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 190ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 191ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 192ac27a0ecSDave Kleikamp */ 193617ba13bSMingming Cao void ext4_free_inode(handle_t *handle, struct inode *inode) 194ac27a0ecSDave Kleikamp { 195ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 196ac27a0ecSDave Kleikamp int is_directory; 197ac27a0ecSDave Kleikamp unsigned long ino; 198ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 199ac27a0ecSDave Kleikamp struct buffer_head *bh2; 200fd2d4291SAvantika Mathur ext4_group_t block_group; 201ac27a0ecSDave Kleikamp unsigned long bit; 202617ba13bSMingming Cao struct ext4_group_desc *gdp; 203617ba13bSMingming Cao struct ext4_super_block *es; 204617ba13bSMingming Cao struct ext4_sb_info *sbi; 2057ce9d5d1SEric Sandeen int fatal = 0, err, count, cleared; 206ac27a0ecSDave Kleikamp 20792b97816STheodore Ts'o if (!sb) { 20892b97816STheodore Ts'o printk(KERN_ERR "EXT4-fs: %s:%d: inode on " 20992b97816STheodore Ts'o "nonexistent device\n", __func__, __LINE__); 21092b97816STheodore Ts'o return; 21192b97816STheodore Ts'o } 212ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 21392b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", 21492b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, 215ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 216ac27a0ecSDave Kleikamp return; 217ac27a0ecSDave Kleikamp } 218ac27a0ecSDave Kleikamp if (inode->i_nlink) { 21992b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", 22092b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, inode->i_nlink); 221ac27a0ecSDave Kleikamp return; 222ac27a0ecSDave Kleikamp } 223617ba13bSMingming Cao sbi = EXT4_SB(sb); 224ac27a0ecSDave Kleikamp 225ac27a0ecSDave Kleikamp ino = inode->i_ino; 226617ba13bSMingming Cao ext4_debug("freeing inode %lu\n", ino); 2279bffad1eSTheodore Ts'o trace_ext4_free_inode(inode); 228ac27a0ecSDave Kleikamp 229ac27a0ecSDave Kleikamp /* 230ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 231ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 232ac27a0ecSDave Kleikamp */ 233871a2931SChristoph Hellwig dquot_initialize(inode); 234617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 23563936ddaSChristoph Hellwig dquot_free_inode(inode); 2369f754758SChristoph Hellwig dquot_drop(inode); 237ac27a0ecSDave Kleikamp 238ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 239ac27a0ecSDave Kleikamp 240ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 2410930fcc1SAl Viro ext4_clear_inode(inode); 242ac27a0ecSDave Kleikamp 243617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 244617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 24512062dddSEric Sandeen ext4_error(sb, "reserved or nonexistent inode %lu", ino); 246ac27a0ecSDave Kleikamp goto error_return; 247ac27a0ecSDave Kleikamp } 248617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 249617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 250e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 251ac27a0ecSDave Kleikamp if (!bitmap_bh) 252ac27a0ecSDave Kleikamp goto error_return; 253ac27a0ecSDave Kleikamp 254ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 255617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 256ac27a0ecSDave Kleikamp if (fatal) 257ac27a0ecSDave Kleikamp goto error_return; 258ac27a0ecSDave Kleikamp 259d17413c0SDmitry Monakhov fatal = -ESRCH; 260617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, block_group, &bh2); 261d17413c0SDmitry Monakhov if (gdp) { 262ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 263617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 264d17413c0SDmitry Monakhov } 265955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 266597d508cSAkinobu Mita cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); 267d17413c0SDmitry Monakhov if (fatal || !cleared) { 268d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 269d17413c0SDmitry Monakhov goto out; 270d17413c0SDmitry Monakhov } 271d17413c0SDmitry Monakhov 272560671a0SAneesh Kumar K.V count = ext4_free_inodes_count(sb, gdp) + 1; 273560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, count); 274560671a0SAneesh Kumar K.V if (is_directory) { 275560671a0SAneesh Kumar K.V count = ext4_used_dirs_count(sb, gdp) - 1; 276560671a0SAneesh Kumar K.V ext4_used_dirs_set(sb, gdp, count); 277d17413c0SDmitry Monakhov percpu_counter_dec(&sbi->s_dirs_counter); 278d17413c0SDmitry Monakhov } 279d17413c0SDmitry Monakhov gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp); 280d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 2817d39db14STheodore Ts'o 282d17413c0SDmitry Monakhov percpu_counter_inc(&sbi->s_freeinodes_counter); 283d17413c0SDmitry Monakhov if (sbi->s_log_groups_per_flex) { 284d17413c0SDmitry Monakhov ext4_group_t f = ext4_flex_group(sbi, block_group); 285d17413c0SDmitry Monakhov 286d17413c0SDmitry Monakhov atomic_inc(&sbi->s_flex_groups[f].free_inodes); 287d17413c0SDmitry Monakhov if (is_directory) 288c4caae25SEric Sandeen atomic_dec(&sbi->s_flex_groups[f].used_dirs); 2897d39db14STheodore Ts'o } 2900390131bSFrank Mayhar BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); 291d17413c0SDmitry Monakhov fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); 292d17413c0SDmitry Monakhov out: 293d17413c0SDmitry Monakhov if (cleared) { 2940390131bSFrank Mayhar BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); 2950390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 296ac27a0ecSDave Kleikamp if (!fatal) 297ac27a0ecSDave Kleikamp fatal = err; 298a0375156STheodore Ts'o ext4_mark_super_dirty(sb); 299d17413c0SDmitry Monakhov } else 300d17413c0SDmitry Monakhov ext4_error(sb, "bit already cleared for inode %lu", ino); 301d17413c0SDmitry Monakhov 302ac27a0ecSDave Kleikamp error_return: 303ac27a0ecSDave Kleikamp brelse(bitmap_bh); 304617ba13bSMingming Cao ext4_std_error(sb, fatal); 305ac27a0ecSDave Kleikamp } 306ac27a0ecSDave Kleikamp 307a4912123STheodore Ts'o struct orlov_stats { 308a4912123STheodore Ts'o __u32 free_inodes; 30924aaa8efSTheodore Ts'o __u32 free_clusters; 310a4912123STheodore Ts'o __u32 used_dirs; 311a4912123STheodore Ts'o }; 312a4912123STheodore Ts'o 313a4912123STheodore Ts'o /* 314a4912123STheodore Ts'o * Helper function for Orlov's allocator; returns critical information 315a4912123STheodore Ts'o * for a particular block group or flex_bg. If flex_size is 1, then g 316a4912123STheodore Ts'o * is a block group number; otherwise it is flex_bg number. 317a4912123STheodore Ts'o */ 3181f109d5aSTheodore Ts'o static void get_orlov_stats(struct super_block *sb, ext4_group_t g, 319a4912123STheodore Ts'o int flex_size, struct orlov_stats *stats) 320a4912123STheodore Ts'o { 321a4912123STheodore Ts'o struct ext4_group_desc *desc; 3227d39db14STheodore Ts'o struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; 323a4912123STheodore Ts'o 3247d39db14STheodore Ts'o if (flex_size > 1) { 3257d39db14STheodore Ts'o stats->free_inodes = atomic_read(&flex_group[g].free_inodes); 32624aaa8efSTheodore Ts'o stats->free_clusters = atomic_read(&flex_group[g].free_clusters); 3277d39db14STheodore Ts'o stats->used_dirs = atomic_read(&flex_group[g].used_dirs); 3287d39db14STheodore Ts'o return; 3297d39db14STheodore Ts'o } 3307d39db14STheodore Ts'o 3317d39db14STheodore Ts'o desc = ext4_get_group_desc(sb, g, NULL); 3327d39db14STheodore Ts'o if (desc) { 3337d39db14STheodore Ts'o stats->free_inodes = ext4_free_inodes_count(sb, desc); 334021b65bbSTheodore Ts'o stats->free_clusters = ext4_free_group_clusters(sb, desc); 3357d39db14STheodore Ts'o stats->used_dirs = ext4_used_dirs_count(sb, desc); 3367d39db14STheodore Ts'o } else { 337a4912123STheodore Ts'o stats->free_inodes = 0; 33824aaa8efSTheodore Ts'o stats->free_clusters = 0; 339a4912123STheodore Ts'o stats->used_dirs = 0; 340a4912123STheodore Ts'o } 341a4912123STheodore Ts'o } 342a4912123STheodore Ts'o 343ac27a0ecSDave Kleikamp /* 344ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 345ac27a0ecSDave Kleikamp * 346ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 347ac27a0ecSDave Kleikamp * 348ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 349ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 350ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 351ac27a0ecSDave Kleikamp * 352ac27a0ecSDave Kleikamp * For the rest rules look so: 353ac27a0ecSDave Kleikamp * 354ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 355ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 356ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 357ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 3581cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 359ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 360ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 361ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 362ac27a0ecSDave Kleikamp */ 363ac27a0ecSDave Kleikamp 3642aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 365dcca3fecSAl Viro ext4_group_t *group, umode_t mode, 366f157a4aaSTheodore Ts'o const struct qstr *qstr) 367ac27a0ecSDave Kleikamp { 368fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 369617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3708df9675fSTheodore Ts'o ext4_group_t real_ngroups = ext4_get_groups_count(sb); 371617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 37214c83c9fSTheodore Ts'o unsigned int freei, avefreei, grp_free; 37324aaa8efSTheodore Ts'o ext4_fsblk_t freeb, avefreec; 374ac27a0ecSDave Kleikamp unsigned int ndirs; 375a4912123STheodore Ts'o int max_dirs, min_inodes; 37624aaa8efSTheodore Ts'o ext4_grpblk_t min_clusters; 3778df9675fSTheodore Ts'o ext4_group_t i, grp, g, ngroups; 378617ba13bSMingming Cao struct ext4_group_desc *desc; 379a4912123STheodore Ts'o struct orlov_stats stats; 380a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(sbi); 381f157a4aaSTheodore Ts'o struct dx_hash_info hinfo; 382a4912123STheodore Ts'o 3838df9675fSTheodore Ts'o ngroups = real_ngroups; 384a4912123STheodore Ts'o if (flex_size > 1) { 3858df9675fSTheodore Ts'o ngroups = (real_ngroups + flex_size - 1) >> 386a4912123STheodore Ts'o sbi->s_log_groups_per_flex; 387a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 388a4912123STheodore Ts'o } 389ac27a0ecSDave Kleikamp 390ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 391ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 39257042651STheodore Ts'o freeb = EXT4_C2B(sbi, 39357042651STheodore Ts'o percpu_counter_read_positive(&sbi->s_freeclusters_counter)); 39424aaa8efSTheodore Ts'o avefreec = freeb; 39524aaa8efSTheodore Ts'o do_div(avefreec, ngroups); 396ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 397ac27a0ecSDave Kleikamp 398a4912123STheodore Ts'o if (S_ISDIR(mode) && 399a4912123STheodore Ts'o ((parent == sb->s_root->d_inode) || 40012e9b892SDmitry Monakhov (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { 401ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4022aa9fc4cSAvantika Mathur int ret = -1; 403ac27a0ecSDave Kleikamp 404f157a4aaSTheodore Ts'o if (qstr) { 405f157a4aaSTheodore Ts'o hinfo.hash_version = DX_HASH_HALF_MD4; 406f157a4aaSTheodore Ts'o hinfo.seed = sbi->s_hash_seed; 407f157a4aaSTheodore Ts'o ext4fs_dirhash(qstr->name, qstr->len, &hinfo); 408f157a4aaSTheodore Ts'o grp = hinfo.hash; 409f157a4aaSTheodore Ts'o } else 4102aa9fc4cSAvantika Mathur get_random_bytes(&grp, sizeof(grp)); 4112aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 412ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 413a4912123STheodore Ts'o g = (parent_group + i) % ngroups; 414a4912123STheodore Ts'o get_orlov_stats(sb, g, flex_size, &stats); 415a4912123STheodore Ts'o if (!stats.free_inodes) 416ac27a0ecSDave Kleikamp continue; 417a4912123STheodore Ts'o if (stats.used_dirs >= best_ndir) 418ac27a0ecSDave Kleikamp continue; 419a4912123STheodore Ts'o if (stats.free_inodes < avefreei) 420ac27a0ecSDave Kleikamp continue; 42124aaa8efSTheodore Ts'o if (stats.free_clusters < avefreec) 422ac27a0ecSDave Kleikamp continue; 423a4912123STheodore Ts'o grp = g; 4242aa9fc4cSAvantika Mathur ret = 0; 425a4912123STheodore Ts'o best_ndir = stats.used_dirs; 426ac27a0ecSDave Kleikamp } 427a4912123STheodore Ts'o if (ret) 428a4912123STheodore Ts'o goto fallback; 429a4912123STheodore Ts'o found_flex_bg: 430a4912123STheodore Ts'o if (flex_size == 1) { 431a4912123STheodore Ts'o *group = grp; 432a4912123STheodore Ts'o return 0; 433a4912123STheodore Ts'o } 434a4912123STheodore Ts'o 435a4912123STheodore Ts'o /* 436a4912123STheodore Ts'o * We pack inodes at the beginning of the flexgroup's 437a4912123STheodore Ts'o * inode tables. Block allocation decisions will do 438a4912123STheodore Ts'o * something similar, although regular files will 439a4912123STheodore Ts'o * start at 2nd block group of the flexgroup. See 440a4912123STheodore Ts'o * ext4_ext_find_goal() and ext4_find_near(). 441a4912123STheodore Ts'o */ 442a4912123STheodore Ts'o grp *= flex_size; 443a4912123STheodore Ts'o for (i = 0; i < flex_size; i++) { 4448df9675fSTheodore Ts'o if (grp+i >= real_ngroups) 445a4912123STheodore Ts'o break; 446a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp+i, NULL); 447a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 448a4912123STheodore Ts'o *group = grp+i; 449a4912123STheodore Ts'o return 0; 450a4912123STheodore Ts'o } 451a4912123STheodore Ts'o } 452ac27a0ecSDave Kleikamp goto fallback; 453ac27a0ecSDave Kleikamp } 454ac27a0ecSDave Kleikamp 455ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 456a4912123STheodore Ts'o min_inodes = avefreei - inodes_per_group*flex_size / 4; 457a4912123STheodore Ts'o if (min_inodes < 1) 458a4912123STheodore Ts'o min_inodes = 1; 45924aaa8efSTheodore Ts'o min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; 460ac27a0ecSDave Kleikamp 461a4912123STheodore Ts'o /* 462a4912123STheodore Ts'o * Start looking in the flex group where we last allocated an 463a4912123STheodore Ts'o * inode for this parent directory 464a4912123STheodore Ts'o */ 465a4912123STheodore Ts'o if (EXT4_I(parent)->i_last_alloc_group != ~0) { 466a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 467a4912123STheodore Ts'o if (flex_size > 1) 468a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 469a4912123STheodore Ts'o } 470ac27a0ecSDave Kleikamp 471ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 472a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 473a4912123STheodore Ts'o get_orlov_stats(sb, grp, flex_size, &stats); 474a4912123STheodore Ts'o if (stats.used_dirs >= max_dirs) 475ac27a0ecSDave Kleikamp continue; 476a4912123STheodore Ts'o if (stats.free_inodes < min_inodes) 477ac27a0ecSDave Kleikamp continue; 47824aaa8efSTheodore Ts'o if (stats.free_clusters < min_clusters) 479ac27a0ecSDave Kleikamp continue; 480a4912123STheodore Ts'o goto found_flex_bg; 481ac27a0ecSDave Kleikamp } 482ac27a0ecSDave Kleikamp 483ac27a0ecSDave Kleikamp fallback: 4848df9675fSTheodore Ts'o ngroups = real_ngroups; 485a4912123STheodore Ts'o avefreei = freei / ngroups; 486b5451f7bSTheodore Ts'o fallback_retry: 487a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_block_group; 488ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 489a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 490a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp, NULL); 49114c83c9fSTheodore Ts'o grp_free = ext4_free_inodes_count(sb, desc); 49214c83c9fSTheodore Ts'o if (desc && grp_free && grp_free >= avefreei) { 493a4912123STheodore Ts'o *group = grp; 4942aa9fc4cSAvantika Mathur return 0; 495ac27a0ecSDave Kleikamp } 496a4912123STheodore Ts'o } 497ac27a0ecSDave Kleikamp 498ac27a0ecSDave Kleikamp if (avefreei) { 499ac27a0ecSDave Kleikamp /* 500ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 501ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 502ac27a0ecSDave Kleikamp */ 503ac27a0ecSDave Kleikamp avefreei = 0; 504b5451f7bSTheodore Ts'o goto fallback_retry; 505ac27a0ecSDave Kleikamp } 506ac27a0ecSDave Kleikamp 507ac27a0ecSDave Kleikamp return -1; 508ac27a0ecSDave Kleikamp } 509ac27a0ecSDave Kleikamp 5102aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 511dcca3fecSAl Viro ext4_group_t *group, umode_t mode) 512ac27a0ecSDave Kleikamp { 513fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 5148df9675fSTheodore Ts'o ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); 515617ba13bSMingming Cao struct ext4_group_desc *desc; 516a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); 517a4912123STheodore Ts'o 518a4912123STheodore Ts'o /* 519a4912123STheodore Ts'o * Try to place the inode is the same flex group as its 520a4912123STheodore Ts'o * parent. If we can't find space, use the Orlov algorithm to 521a4912123STheodore Ts'o * find another flex group, and store that information in the 522a4912123STheodore Ts'o * parent directory's inode information so that use that flex 523a4912123STheodore Ts'o * group for future allocations. 524a4912123STheodore Ts'o */ 525a4912123STheodore Ts'o if (flex_size > 1) { 526a4912123STheodore Ts'o int retry = 0; 527a4912123STheodore Ts'o 528a4912123STheodore Ts'o try_again: 529a4912123STheodore Ts'o parent_group &= ~(flex_size-1); 530a4912123STheodore Ts'o last = parent_group + flex_size; 531a4912123STheodore Ts'o if (last > ngroups) 532a4912123STheodore Ts'o last = ngroups; 533a4912123STheodore Ts'o for (i = parent_group; i < last; i++) { 534a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, i, NULL); 535a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 536a4912123STheodore Ts'o *group = i; 537a4912123STheodore Ts'o return 0; 538a4912123STheodore Ts'o } 539a4912123STheodore Ts'o } 540a4912123STheodore Ts'o if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { 541a4912123STheodore Ts'o retry = 1; 542a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 543a4912123STheodore Ts'o goto try_again; 544a4912123STheodore Ts'o } 545a4912123STheodore Ts'o /* 546a4912123STheodore Ts'o * If this didn't work, use the Orlov search algorithm 547a4912123STheodore Ts'o * to find a new flex group; we pass in the mode to 548a4912123STheodore Ts'o * avoid the topdir algorithms. 549a4912123STheodore Ts'o */ 550a4912123STheodore Ts'o *group = parent_group + flex_size; 551a4912123STheodore Ts'o if (*group > ngroups) 552a4912123STheodore Ts'o *group = 0; 5537dc57615SPeter Huewe return find_group_orlov(sb, parent, group, mode, NULL); 554a4912123STheodore Ts'o } 555ac27a0ecSDave Kleikamp 556ac27a0ecSDave Kleikamp /* 557ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 558ac27a0ecSDave Kleikamp */ 5592aa9fc4cSAvantika Mathur *group = parent_group; 5602aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 561560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 562021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 5632aa9fc4cSAvantika Mathur return 0; 564ac27a0ecSDave Kleikamp 565ac27a0ecSDave Kleikamp /* 566ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 567ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 568ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 569ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 570ac27a0ecSDave Kleikamp * different blockgroup. 571ac27a0ecSDave Kleikamp * 572ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 573ac27a0ecSDave Kleikamp */ 5742aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 575ac27a0ecSDave Kleikamp 576ac27a0ecSDave Kleikamp /* 577ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 578ac27a0ecSDave Kleikamp * blocks. 579ac27a0ecSDave Kleikamp */ 580ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 5812aa9fc4cSAvantika Mathur *group += i; 5822aa9fc4cSAvantika Mathur if (*group >= ngroups) 5832aa9fc4cSAvantika Mathur *group -= ngroups; 5842aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 585560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 586021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 5872aa9fc4cSAvantika Mathur return 0; 588ac27a0ecSDave Kleikamp } 589ac27a0ecSDave Kleikamp 590ac27a0ecSDave Kleikamp /* 591ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 592ac27a0ecSDave Kleikamp * has no free blocks. 593ac27a0ecSDave Kleikamp */ 5942aa9fc4cSAvantika Mathur *group = parent_group; 595ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 5962aa9fc4cSAvantika Mathur if (++*group >= ngroups) 5972aa9fc4cSAvantika Mathur *group = 0; 5982aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 599560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc)) 6002aa9fc4cSAvantika Mathur return 0; 601ac27a0ecSDave Kleikamp } 602ac27a0ecSDave Kleikamp 603ac27a0ecSDave Kleikamp return -1; 604ac27a0ecSDave Kleikamp } 605ac27a0ecSDave Kleikamp 606ac27a0ecSDave Kleikamp /* 607ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 608ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 609ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 610ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 611ac27a0ecSDave Kleikamp * directories already is chosen. 612ac27a0ecSDave Kleikamp * 613ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 614ac27a0ecSDave Kleikamp * group to find a free inode. 615ac27a0ecSDave Kleikamp */ 616dcca3fecSAl Viro struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, umode_t mode, 6175cb81dabSDmitry Monakhov const struct qstr *qstr, __u32 goal, uid_t *owner) 618ac27a0ecSDave Kleikamp { 619ac27a0ecSDave Kleikamp struct super_block *sb; 6203300bedaSAneesh Kumar K.V struct buffer_head *inode_bitmap_bh = NULL; 6213300bedaSAneesh Kumar K.V struct buffer_head *group_desc_bh; 6228df9675fSTheodore Ts'o ext4_group_t ngroups, group = 0; 623ac27a0ecSDave Kleikamp unsigned long ino = 0; 624ac27a0ecSDave Kleikamp struct inode *inode; 625617ba13bSMingming Cao struct ext4_group_desc *gdp = NULL; 626617ba13bSMingming Cao struct ext4_inode_info *ei; 627617ba13bSMingming Cao struct ext4_sb_info *sbi; 62839341867SAneesh Kumar K.V int ret2, err = 0; 629ac27a0ecSDave Kleikamp struct inode *ret; 6302aa9fc4cSAvantika Mathur ext4_group_t i; 631772cb7c8SJose R. Santos ext4_group_t flex_group; 632ac27a0ecSDave Kleikamp 633ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 634ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 635ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 636ac27a0ecSDave Kleikamp 637ac27a0ecSDave Kleikamp sb = dir->i_sb; 6388df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 6399bffad1eSTheodore Ts'o trace_ext4_request_inode(dir, mode); 640ac27a0ecSDave Kleikamp inode = new_inode(sb); 641ac27a0ecSDave Kleikamp if (!inode) 642ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 643617ba13bSMingming Cao ei = EXT4_I(inode); 644617ba13bSMingming Cao sbi = EXT4_SB(sb); 645772cb7c8SJose R. Santos 64611013911SAndreas Dilger if (!goal) 64711013911SAndreas Dilger goal = sbi->s_inode_goal; 64811013911SAndreas Dilger 649e6462869SJohann Lombardi if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { 65011013911SAndreas Dilger group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); 65111013911SAndreas Dilger ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); 65211013911SAndreas Dilger ret2 = 0; 65311013911SAndreas Dilger goto got_group; 65411013911SAndreas Dilger } 65511013911SAndreas Dilger 6564113c4caSLukas Czerner if (S_ISDIR(mode)) 657f157a4aaSTheodore Ts'o ret2 = find_group_orlov(sb, dir, &group, mode, qstr); 6584113c4caSLukas Czerner else 659a4912123STheodore Ts'o ret2 = find_group_other(sb, dir, &group, mode); 660ac27a0ecSDave Kleikamp 661772cb7c8SJose R. Santos got_group: 662a4912123STheodore Ts'o EXT4_I(dir)->i_last_alloc_group = group; 663ac27a0ecSDave Kleikamp err = -ENOSPC; 6642aa9fc4cSAvantika Mathur if (ret2 == -1) 665ac27a0ecSDave Kleikamp goto out; 666ac27a0ecSDave Kleikamp 667119c0d44STheodore Ts'o /* 668119c0d44STheodore Ts'o * Normally we will only go through one pass of this loop, 669119c0d44STheodore Ts'o * unless we get unlucky and it turns out the group we selected 670119c0d44STheodore Ts'o * had its last inode grabbed by someone else. 671119c0d44STheodore Ts'o */ 67211013911SAndreas Dilger for (i = 0; i < ngroups; i++, ino = 0) { 673ac27a0ecSDave Kleikamp err = -EIO; 674ac27a0ecSDave Kleikamp 6753300bedaSAneesh Kumar K.V gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 676ac27a0ecSDave Kleikamp if (!gdp) 677ac27a0ecSDave Kleikamp goto fail; 678ac27a0ecSDave Kleikamp 6793300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 6803300bedaSAneesh Kumar K.V inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); 6813300bedaSAneesh Kumar K.V if (!inode_bitmap_bh) 682ac27a0ecSDave Kleikamp goto fail; 683ac27a0ecSDave Kleikamp 684ac27a0ecSDave Kleikamp repeat_in_this_group: 685617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 6863300bedaSAneesh Kumar K.V inode_bitmap_bh->b_data, 6873300bedaSAneesh Kumar K.V EXT4_INODES_PER_GROUP(sb), ino); 688119c0d44STheodore Ts'o if (ino >= EXT4_INODES_PER_GROUP(sb)) { 6898df9675fSTheodore Ts'o if (++group == ngroups) 690ac27a0ecSDave Kleikamp group = 0; 691119c0d44STheodore Ts'o continue; 692119c0d44STheodore Ts'o } 693119c0d44STheodore Ts'o if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) { 694119c0d44STheodore Ts'o ext4_error(sb, "reserved inode found cleared - " 695119c0d44STheodore Ts'o "inode=%lu", ino + 1); 696119c0d44STheodore Ts'o continue; 697119c0d44STheodore Ts'o } 698119c0d44STheodore Ts'o ext4_lock_group(sb, group); 699119c0d44STheodore Ts'o ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); 700119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 701119c0d44STheodore Ts'o ino++; /* the inode bitmap is zero-based */ 702119c0d44STheodore Ts'o if (!ret2) 703119c0d44STheodore Ts'o goto got; /* we grabbed the inode! */ 704119c0d44STheodore Ts'o if (ino < EXT4_INODES_PER_GROUP(sb)) 705119c0d44STheodore Ts'o goto repeat_in_this_group; 706ac27a0ecSDave Kleikamp } 707ac27a0ecSDave Kleikamp err = -ENOSPC; 708ac27a0ecSDave Kleikamp goto out; 709ac27a0ecSDave Kleikamp 710ac27a0ecSDave Kleikamp got: 711717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 712717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 713717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 7143300bedaSAneesh Kumar K.V struct buffer_head *block_bitmap_bh; 715717d50e4SAndreas Dilger 7163300bedaSAneesh Kumar K.V block_bitmap_bh = ext4_read_block_bitmap(sb, group); 7173300bedaSAneesh Kumar K.V BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); 7183300bedaSAneesh Kumar K.V err = ext4_journal_get_write_access(handle, block_bitmap_bh); 719717d50e4SAndreas Dilger if (err) { 7203300bedaSAneesh Kumar K.V brelse(block_bitmap_bh); 721717d50e4SAndreas Dilger goto fail; 722717d50e4SAndreas Dilger } 723717d50e4SAndreas Dilger 724fd034a84STheodore Ts'o BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); 725fd034a84STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); 726fd034a84STheodore Ts'o brelse(block_bitmap_bh); 727fd034a84STheodore Ts'o 728717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 729fd034a84STheodore Ts'o ext4_lock_group(sb, group); 730717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 7313300bedaSAneesh Kumar K.V gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 732021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 733cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, group, gdp)); 73423712a9cSFrederic Bohe gdp->bg_checksum = ext4_group_desc_csum(sbi, group, 73523712a9cSFrederic Bohe gdp); 736717d50e4SAndreas Dilger } 737955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, group); 738717d50e4SAndreas Dilger 739717d50e4SAndreas Dilger if (err) 740717d50e4SAndreas Dilger goto fail; 741717d50e4SAndreas Dilger } 742119c0d44STheodore Ts'o 743119c0d44STheodore Ts'o BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); 744119c0d44STheodore Ts'o err = ext4_journal_get_write_access(handle, inode_bitmap_bh); 745119c0d44STheodore Ts'o if (err) 746119c0d44STheodore Ts'o goto fail; 747119c0d44STheodore Ts'o 748119c0d44STheodore Ts'o BUFFER_TRACE(group_desc_bh, "get_write_access"); 749119c0d44STheodore Ts'o err = ext4_journal_get_write_access(handle, group_desc_bh); 750119c0d44STheodore Ts'o if (err) 751119c0d44STheodore Ts'o goto fail; 752119c0d44STheodore Ts'o 753119c0d44STheodore Ts'o /* Update the relevant bg descriptor fields */ 754119c0d44STheodore Ts'o if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 755119c0d44STheodore Ts'o int free; 756119c0d44STheodore Ts'o struct ext4_group_info *grp = ext4_get_group_info(sb, group); 757119c0d44STheodore Ts'o 758119c0d44STheodore Ts'o down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ 759119c0d44STheodore Ts'o ext4_lock_group(sb, group); /* while we modify the bg desc */ 760119c0d44STheodore Ts'o free = EXT4_INODES_PER_GROUP(sb) - 761119c0d44STheodore Ts'o ext4_itable_unused_count(sb, gdp); 762119c0d44STheodore Ts'o if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 763119c0d44STheodore Ts'o gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 764119c0d44STheodore Ts'o free = 0; 765119c0d44STheodore Ts'o } 766119c0d44STheodore Ts'o /* 767119c0d44STheodore Ts'o * Check the relative inode number against the last used 768119c0d44STheodore Ts'o * relative inode number in this group. if it is greater 769119c0d44STheodore Ts'o * we need to update the bg_itable_unused count 770119c0d44STheodore Ts'o */ 771119c0d44STheodore Ts'o if (ino > free) 772119c0d44STheodore Ts'o ext4_itable_unused_set(sb, gdp, 773119c0d44STheodore Ts'o (EXT4_INODES_PER_GROUP(sb) - ino)); 774119c0d44STheodore Ts'o up_read(&grp->alloc_sem); 775119c0d44STheodore Ts'o } 776119c0d44STheodore Ts'o ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); 777119c0d44STheodore Ts'o if (S_ISDIR(mode)) { 778119c0d44STheodore Ts'o ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); 779119c0d44STheodore Ts'o if (sbi->s_log_groups_per_flex) { 780119c0d44STheodore Ts'o ext4_group_t f = ext4_flex_group(sbi, group); 781119c0d44STheodore Ts'o 782119c0d44STheodore Ts'o atomic_inc(&sbi->s_flex_groups[f].used_dirs); 783119c0d44STheodore Ts'o } 784119c0d44STheodore Ts'o } 785119c0d44STheodore Ts'o if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 786119c0d44STheodore Ts'o gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 787119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 788119c0d44STheodore Ts'o } 789119c0d44STheodore Ts'o 790119c0d44STheodore Ts'o BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); 791119c0d44STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); 792119c0d44STheodore Ts'o if (err) 793119c0d44STheodore Ts'o goto fail; 794119c0d44STheodore Ts'o 7953300bedaSAneesh Kumar K.V BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); 7963300bedaSAneesh Kumar K.V err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); 79739341867SAneesh Kumar K.V if (err) 79839341867SAneesh Kumar K.V goto fail; 799ac27a0ecSDave Kleikamp 800ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 801ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 802ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 803a0375156STheodore Ts'o ext4_mark_super_dirty(sb); 804ac27a0ecSDave Kleikamp 805772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 806772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 8079f24e420STheodore Ts'o atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); 808772cb7c8SJose R. Santos } 8095cb81dabSDmitry Monakhov if (owner) { 8105cb81dabSDmitry Monakhov inode->i_mode = mode; 8115cb81dabSDmitry Monakhov inode->i_uid = owner[0]; 8125cb81dabSDmitry Monakhov inode->i_gid = owner[1]; 8135cb81dabSDmitry Monakhov } else if (test_opt(sb, GRPID)) { 814ac27a0ecSDave Kleikamp inode->i_mode = mode; 815b10b8520SDmitry Monakhov inode->i_uid = current_fsuid(); 816b10b8520SDmitry Monakhov inode->i_gid = dir->i_gid; 817b10b8520SDmitry Monakhov } else 818b10b8520SDmitry Monakhov inode_init_owner(inode, dir, mode); 819ac27a0ecSDave Kleikamp 820717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 821ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 822ac27a0ecSDave Kleikamp inode->i_blocks = 0; 823ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 824ef7f3835SKalpak Shah ext4_current_time(inode); 825ac27a0ecSDave Kleikamp 826ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 827ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 828ac27a0ecSDave Kleikamp ei->i_disksize = 0; 829ac27a0ecSDave Kleikamp 8304af83508SEryu Guan /* Don't inherit extent flag from directory, amongst others. */ 8312dc6b0d4SDuane Griffin ei->i_flags = 8322dc6b0d4SDuane Griffin ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); 833ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 834ac27a0ecSDave Kleikamp ei->i_dtime = 0; 835ac27a0ecSDave Kleikamp ei->i_block_group = group; 836a4912123STheodore Ts'o ei->i_last_alloc_group = ~0; 837ac27a0ecSDave Kleikamp 838617ba13bSMingming Cao ext4_set_inode_flags(inode); 839ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 8400390131bSFrank Mayhar ext4_handle_sync(handle); 8416b38e842SAl Viro if (insert_inode_locked(inode) < 0) { 842acd6ad83SJan Kara /* 843acd6ad83SJan Kara * Likely a bitmap corruption causing inode to be allocated 844acd6ad83SJan Kara * twice. 845acd6ad83SJan Kara */ 846acd6ad83SJan Kara err = -EIO; 847acd6ad83SJan Kara goto fail; 8486b38e842SAl Viro } 849ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 850ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 851ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 852ac27a0ecSDave Kleikamp 853353eb83cSTheodore Ts'o ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ 85419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NEW); 855ef7f3835SKalpak Shah 856ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 857ac27a0ecSDave Kleikamp 858ac27a0ecSDave Kleikamp ret = inode; 859871a2931SChristoph Hellwig dquot_initialize(inode); 86063936ddaSChristoph Hellwig err = dquot_alloc_inode(inode); 86163936ddaSChristoph Hellwig if (err) 862ac27a0ecSDave Kleikamp goto fail_drop; 863ac27a0ecSDave Kleikamp 864617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 865ac27a0ecSDave Kleikamp if (err) 866ac27a0ecSDave Kleikamp goto fail_free_drop; 867ac27a0ecSDave Kleikamp 8682a7dba39SEric Paris err = ext4_init_security(handle, inode, dir, qstr); 869ac27a0ecSDave Kleikamp if (err) 870ac27a0ecSDave Kleikamp goto fail_free_drop; 871ac27a0ecSDave Kleikamp 87283982b6fSTheodore Ts'o if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 873e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 874e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 87512e9b892SDmitry Monakhov ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); 876a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 877a86c6181SAlex Tomas } 87842bf0383SAneesh Kumar K.V } 879ac27a0ecSDave Kleikamp 880688f869cSTheodore Ts'o if (ext4_handle_valid(handle)) { 881688f869cSTheodore Ts'o ei->i_sync_tid = handle->h_transaction->t_tid; 882688f869cSTheodore Ts'o ei->i_datasync_tid = handle->h_transaction->t_tid; 883688f869cSTheodore Ts'o } 884688f869cSTheodore Ts'o 8858753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 8868753e88fSAneesh Kumar K.V if (err) { 8878753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 8888753e88fSAneesh Kumar K.V goto fail_free_drop; 8898753e88fSAneesh Kumar K.V } 8908753e88fSAneesh Kumar K.V 891617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 8929bffad1eSTheodore Ts'o trace_ext4_allocate_inode(inode, dir, mode); 893ac27a0ecSDave Kleikamp goto really_out; 894ac27a0ecSDave Kleikamp fail: 895617ba13bSMingming Cao ext4_std_error(sb, err); 896ac27a0ecSDave Kleikamp out: 897ac27a0ecSDave Kleikamp iput(inode); 898ac27a0ecSDave Kleikamp ret = ERR_PTR(err); 899ac27a0ecSDave Kleikamp really_out: 9003300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 901ac27a0ecSDave Kleikamp return ret; 902ac27a0ecSDave Kleikamp 903ac27a0ecSDave Kleikamp fail_free_drop: 90463936ddaSChristoph Hellwig dquot_free_inode(inode); 905ac27a0ecSDave Kleikamp 906ac27a0ecSDave Kleikamp fail_drop: 9079f754758SChristoph Hellwig dquot_drop(inode); 908ac27a0ecSDave Kleikamp inode->i_flags |= S_NOQUOTA; 9096d6b77f1SMiklos Szeredi clear_nlink(inode); 9106b38e842SAl Viro unlock_new_inode(inode); 911ac27a0ecSDave Kleikamp iput(inode); 9123300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 913ac27a0ecSDave Kleikamp return ERR_PTR(err); 914ac27a0ecSDave Kleikamp } 915ac27a0ecSDave Kleikamp 916ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 917617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 918ac27a0ecSDave Kleikamp { 919617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 920fd2d4291SAvantika Mathur ext4_group_t block_group; 921ac27a0ecSDave Kleikamp int bit; 9221d1fe1eeSDavid Howells struct buffer_head *bitmap_bh; 923ac27a0ecSDave Kleikamp struct inode *inode = NULL; 9241d1fe1eeSDavid Howells long err = -EIO; 925ac27a0ecSDave Kleikamp 926ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 927ac27a0ecSDave Kleikamp if (ino > max_ino) { 92812062dddSEric Sandeen ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino); 9291d1fe1eeSDavid Howells goto error; 930ac27a0ecSDave Kleikamp } 931ac27a0ecSDave Kleikamp 932617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 933617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 934e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 935ac27a0ecSDave Kleikamp if (!bitmap_bh) { 93612062dddSEric Sandeen ext4_warning(sb, "inode bitmap error for orphan %lu", ino); 9371d1fe1eeSDavid Howells goto error; 938ac27a0ecSDave Kleikamp } 939ac27a0ecSDave Kleikamp 940ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 941ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 942ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 943ac27a0ecSDave Kleikamp */ 9441d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 9451d1fe1eeSDavid Howells goto bad_orphan; 9461d1fe1eeSDavid Howells 9471d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 9481d1fe1eeSDavid Howells if (IS_ERR(inode)) 9491d1fe1eeSDavid Howells goto iget_failed; 9501d1fe1eeSDavid Howells 95191ef4cafSDuane Griffin /* 95291ef4cafSDuane Griffin * If the orphans has i_nlinks > 0 then it should be able to be 95391ef4cafSDuane Griffin * truncated, otherwise it won't be removed from the orphan list 95491ef4cafSDuane Griffin * during processing and an infinite loop will result. 95591ef4cafSDuane Griffin */ 95691ef4cafSDuane Griffin if (inode->i_nlink && !ext4_can_truncate(inode)) 95791ef4cafSDuane Griffin goto bad_orphan; 95891ef4cafSDuane Griffin 9591d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 9601d1fe1eeSDavid Howells goto bad_orphan; 9611d1fe1eeSDavid Howells brelse(bitmap_bh); 9621d1fe1eeSDavid Howells return inode; 9631d1fe1eeSDavid Howells 9641d1fe1eeSDavid Howells iget_failed: 9651d1fe1eeSDavid Howells err = PTR_ERR(inode); 9661d1fe1eeSDavid Howells inode = NULL; 9671d1fe1eeSDavid Howells bad_orphan: 96812062dddSEric Sandeen ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino); 969617ba13bSMingming Cao printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n", 970ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 971617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 972ac27a0ecSDave Kleikamp printk(KERN_NOTICE "inode=%p\n", inode); 973ac27a0ecSDave Kleikamp if (inode) { 974ac27a0ecSDave Kleikamp printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", 975ac27a0ecSDave Kleikamp is_bad_inode(inode)); 976ac27a0ecSDave Kleikamp printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", 977ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 978ac27a0ecSDave Kleikamp printk(KERN_NOTICE "max_ino=%lu\n", max_ino); 97991ef4cafSDuane Griffin printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); 980ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 9811d1fe1eeSDavid Howells if (inode->i_nlink == 0) 982ac27a0ecSDave Kleikamp inode->i_blocks = 0; 983ac27a0ecSDave Kleikamp iput(inode); 984ac27a0ecSDave Kleikamp } 985ac27a0ecSDave Kleikamp brelse(bitmap_bh); 9861d1fe1eeSDavid Howells error: 9871d1fe1eeSDavid Howells return ERR_PTR(err); 988ac27a0ecSDave Kleikamp } 989ac27a0ecSDave Kleikamp 990617ba13bSMingming Cao unsigned long ext4_count_free_inodes(struct super_block *sb) 991ac27a0ecSDave Kleikamp { 992ac27a0ecSDave Kleikamp unsigned long desc_count; 993617ba13bSMingming Cao struct ext4_group_desc *gdp; 9948df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 995617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 996617ba13bSMingming Cao struct ext4_super_block *es; 997ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 998ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 999ac27a0ecSDave Kleikamp 1000617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 1001ac27a0ecSDave Kleikamp desc_count = 0; 1002ac27a0ecSDave Kleikamp bitmap_count = 0; 1003ac27a0ecSDave Kleikamp gdp = NULL; 10048df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1005617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1006ac27a0ecSDave Kleikamp if (!gdp) 1007ac27a0ecSDave Kleikamp continue; 1008560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1009ac27a0ecSDave Kleikamp brelse(bitmap_bh); 1010e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 1011ac27a0ecSDave Kleikamp if (!bitmap_bh) 1012ac27a0ecSDave Kleikamp continue; 1013ac27a0ecSDave Kleikamp 1014617ba13bSMingming Cao x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8); 1015c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 1016785b4b3aSPeng Tao (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); 1017ac27a0ecSDave Kleikamp bitmap_count += x; 1018ac27a0ecSDave Kleikamp } 1019ac27a0ecSDave Kleikamp brelse(bitmap_bh); 10204776004fSTheodore Ts'o printk(KERN_DEBUG "ext4_count_free_inodes: " 10214776004fSTheodore Ts'o "stored = %u, computed = %lu, %lu\n", 1022ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 1023ac27a0ecSDave Kleikamp return desc_count; 1024ac27a0ecSDave Kleikamp #else 1025ac27a0ecSDave Kleikamp desc_count = 0; 10268df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1027617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1028ac27a0ecSDave Kleikamp if (!gdp) 1029ac27a0ecSDave Kleikamp continue; 1030560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1031ac27a0ecSDave Kleikamp cond_resched(); 1032ac27a0ecSDave Kleikamp } 1033ac27a0ecSDave Kleikamp return desc_count; 1034ac27a0ecSDave Kleikamp #endif 1035ac27a0ecSDave Kleikamp } 1036ac27a0ecSDave Kleikamp 1037ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1038617ba13bSMingming Cao unsigned long ext4_count_dirs(struct super_block * sb) 1039ac27a0ecSDave Kleikamp { 1040ac27a0ecSDave Kleikamp unsigned long count = 0; 10418df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1042ac27a0ecSDave Kleikamp 10438df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1044617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1045ac27a0ecSDave Kleikamp if (!gdp) 1046ac27a0ecSDave Kleikamp continue; 1047560671a0SAneesh Kumar K.V count += ext4_used_dirs_count(sb, gdp); 1048ac27a0ecSDave Kleikamp } 1049ac27a0ecSDave Kleikamp return count; 1050ac27a0ecSDave Kleikamp } 1051bfff6873SLukas Czerner 1052bfff6873SLukas Czerner /* 1053bfff6873SLukas Czerner * Zeroes not yet zeroed inode table - just write zeroes through the whole 1054bfff6873SLukas Czerner * inode table. Must be called without any spinlock held. The only place 1055bfff6873SLukas Czerner * where it is called from on active part of filesystem is ext4lazyinit 1056bfff6873SLukas Czerner * thread, so we do not need any special locks, however we have to prevent 1057bfff6873SLukas Czerner * inode allocation from the current group, so we take alloc_sem lock, to 1058119c0d44STheodore Ts'o * block ext4_new_inode() until we are finished. 1059bfff6873SLukas Czerner */ 1060e0cbee3eSH Hartley Sweeten int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, 1061bfff6873SLukas Czerner int barrier) 1062bfff6873SLukas Czerner { 1063bfff6873SLukas Czerner struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1064bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 1065bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 1066bfff6873SLukas Czerner struct buffer_head *group_desc_bh; 1067bfff6873SLukas Czerner handle_t *handle; 1068bfff6873SLukas Czerner ext4_fsblk_t blk; 1069bfff6873SLukas Czerner int num, ret = 0, used_blks = 0; 1070bfff6873SLukas Czerner 1071bfff6873SLukas Czerner /* This should not happen, but just to be sure check this */ 1072bfff6873SLukas Czerner if (sb->s_flags & MS_RDONLY) { 1073bfff6873SLukas Czerner ret = 1; 1074bfff6873SLukas Czerner goto out; 1075bfff6873SLukas Czerner } 1076bfff6873SLukas Czerner 1077bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 1078bfff6873SLukas Czerner if (!gdp) 1079bfff6873SLukas Czerner goto out; 1080bfff6873SLukas Czerner 1081bfff6873SLukas Czerner /* 1082bfff6873SLukas Czerner * We do not need to lock this, because we are the only one 1083bfff6873SLukas Czerner * handling this flag. 1084bfff6873SLukas Czerner */ 1085bfff6873SLukas Czerner if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) 1086bfff6873SLukas Czerner goto out; 1087bfff6873SLukas Czerner 1088bfff6873SLukas Czerner handle = ext4_journal_start_sb(sb, 1); 1089bfff6873SLukas Czerner if (IS_ERR(handle)) { 1090bfff6873SLukas Czerner ret = PTR_ERR(handle); 1091bfff6873SLukas Czerner goto out; 1092bfff6873SLukas Czerner } 1093bfff6873SLukas Czerner 1094bfff6873SLukas Czerner down_write(&grp->alloc_sem); 1095bfff6873SLukas Czerner /* 1096bfff6873SLukas Czerner * If inode bitmap was already initialized there may be some 1097bfff6873SLukas Czerner * used inodes so we need to skip blocks with used inodes in 1098bfff6873SLukas Czerner * inode table. 1099bfff6873SLukas Czerner */ 1100bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) 1101bfff6873SLukas Czerner used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - 1102bfff6873SLukas Czerner ext4_itable_unused_count(sb, gdp)), 1103bfff6873SLukas Czerner sbi->s_inodes_per_block); 1104bfff6873SLukas Czerner 1105857ac889SLukas Czerner if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { 11061084f252STheodore Ts'o ext4_error(sb, "Something is wrong with group %u: " 11071084f252STheodore Ts'o "used itable blocks: %d; " 11081084f252STheodore Ts'o "itable unused count: %u", 1109857ac889SLukas Czerner group, used_blks, 1110857ac889SLukas Czerner ext4_itable_unused_count(sb, gdp)); 1111857ac889SLukas Czerner ret = 1; 111233853a0dSYongqiang Yang goto err_out; 1113857ac889SLukas Czerner } 1114857ac889SLukas Czerner 1115bfff6873SLukas Czerner blk = ext4_inode_table(sb, gdp) + used_blks; 1116bfff6873SLukas Czerner num = sbi->s_itb_per_group - used_blks; 1117bfff6873SLukas Czerner 1118bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, "get_write_access"); 1119bfff6873SLukas Czerner ret = ext4_journal_get_write_access(handle, 1120bfff6873SLukas Czerner group_desc_bh); 1121bfff6873SLukas Czerner if (ret) 1122bfff6873SLukas Czerner goto err_out; 1123bfff6873SLukas Czerner 1124bfff6873SLukas Czerner /* 1125bfff6873SLukas Czerner * Skip zeroout if the inode table is full. But we set the ZEROED 1126bfff6873SLukas Czerner * flag anyway, because obviously, when it is full it does not need 1127bfff6873SLukas Czerner * further zeroing. 1128bfff6873SLukas Czerner */ 1129bfff6873SLukas Czerner if (unlikely(num == 0)) 1130bfff6873SLukas Czerner goto skip_zeroout; 1131bfff6873SLukas Czerner 1132bfff6873SLukas Czerner ext4_debug("going to zero out inode table in group %d\n", 1133bfff6873SLukas Czerner group); 1134a107e5a3STheodore Ts'o ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); 1135bfff6873SLukas Czerner if (ret < 0) 1136bfff6873SLukas Czerner goto err_out; 1137a107e5a3STheodore Ts'o if (barrier) 1138a107e5a3STheodore Ts'o blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); 1139bfff6873SLukas Czerner 1140bfff6873SLukas Czerner skip_zeroout: 1141bfff6873SLukas Czerner ext4_lock_group(sb, group); 1142bfff6873SLukas Czerner gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); 1143bfff6873SLukas Czerner gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 1144bfff6873SLukas Czerner ext4_unlock_group(sb, group); 1145bfff6873SLukas Czerner 1146bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, 1147bfff6873SLukas Czerner "call ext4_handle_dirty_metadata"); 1148bfff6873SLukas Czerner ret = ext4_handle_dirty_metadata(handle, NULL, 1149bfff6873SLukas Czerner group_desc_bh); 1150bfff6873SLukas Czerner 1151bfff6873SLukas Czerner err_out: 1152bfff6873SLukas Czerner up_write(&grp->alloc_sem); 1153bfff6873SLukas Czerner ext4_journal_stop(handle); 1154bfff6873SLukas Czerner out: 1155bfff6873SLukas Czerner return ret; 1156bfff6873SLukas Czerner } 1157