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> 263dcf5451SChristoph Hellwig #include "ext4.h" 273dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 28ac27a0ecSDave Kleikamp #include "xattr.h" 29ac27a0ecSDave Kleikamp #include "acl.h" 30717d50e4SAndreas Dilger #include "group.h" 31ac27a0ecSDave Kleikamp 32ac27a0ecSDave Kleikamp /* 33ac27a0ecSDave Kleikamp * ialloc.c contains the inodes allocation and deallocation routines 34ac27a0ecSDave Kleikamp */ 35ac27a0ecSDave Kleikamp 36ac27a0ecSDave Kleikamp /* 37ac27a0ecSDave Kleikamp * The free inodes are managed by bitmaps. A file system contains several 38ac27a0ecSDave Kleikamp * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap 39ac27a0ecSDave Kleikamp * block for inodes, N blocks for the inode table and data blocks. 40ac27a0ecSDave Kleikamp * 41ac27a0ecSDave Kleikamp * The file system contains group descriptors which are located after the 42ac27a0ecSDave Kleikamp * super block. Each descriptor contains the number of the bitmap block and 43ac27a0ecSDave Kleikamp * the free blocks count in the block. 44ac27a0ecSDave Kleikamp */ 45ac27a0ecSDave Kleikamp 46717d50e4SAndreas Dilger /* 47717d50e4SAndreas Dilger * To avoid calling the atomic setbit hundreds or thousands of times, we only 48717d50e4SAndreas Dilger * need to use it within a single byte (to ensure we get endianness right). 49717d50e4SAndreas Dilger * We can use memset for the rest of the bitmap as there are no other users. 50717d50e4SAndreas Dilger */ 51717d50e4SAndreas Dilger void mark_bitmap_end(int start_bit, int end_bit, char *bitmap) 52717d50e4SAndreas Dilger { 53717d50e4SAndreas Dilger int i; 54717d50e4SAndreas Dilger 55717d50e4SAndreas Dilger if (start_bit >= end_bit) 56717d50e4SAndreas Dilger return; 57717d50e4SAndreas Dilger 58717d50e4SAndreas Dilger ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); 59717d50e4SAndreas Dilger for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) 60717d50e4SAndreas Dilger ext4_set_bit(i, bitmap); 61717d50e4SAndreas Dilger if (i < end_bit) 62717d50e4SAndreas Dilger memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); 63717d50e4SAndreas Dilger } 64717d50e4SAndreas Dilger 65717d50e4SAndreas Dilger /* Initializes an uninitialized inode bitmap */ 66fd2d4291SAvantika Mathur unsigned ext4_init_inode_bitmap(struct super_block *sb, struct buffer_head *bh, 67fd2d4291SAvantika Mathur ext4_group_t block_group, 68717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 69717d50e4SAndreas Dilger { 70717d50e4SAndreas Dilger struct ext4_sb_info *sbi = EXT4_SB(sb); 71717d50e4SAndreas Dilger 72717d50e4SAndreas Dilger J_ASSERT_BH(bh, buffer_locked(bh)); 73717d50e4SAndreas Dilger 74717d50e4SAndreas Dilger /* If checksum is bad mark all blocks and inodes use to prevent 75717d50e4SAndreas Dilger * allocation, essentially implementing a per-group read-only flag. */ 76717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { 7746e665e9SHarvey Harrison ext4_error(sb, __func__, "Checksum bad for group %lu\n", 78717d50e4SAndreas Dilger block_group); 79717d50e4SAndreas Dilger gdp->bg_free_blocks_count = 0; 80717d50e4SAndreas Dilger gdp->bg_free_inodes_count = 0; 81717d50e4SAndreas Dilger gdp->bg_itable_unused = 0; 82717d50e4SAndreas Dilger memset(bh->b_data, 0xff, sb->s_blocksize); 83717d50e4SAndreas Dilger return 0; 84717d50e4SAndreas Dilger } 85717d50e4SAndreas Dilger 86717d50e4SAndreas Dilger memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 87717d50e4SAndreas Dilger mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), EXT4_BLOCKS_PER_GROUP(sb), 88717d50e4SAndreas Dilger bh->b_data); 89717d50e4SAndreas Dilger 90717d50e4SAndreas Dilger return EXT4_INODES_PER_GROUP(sb); 91717d50e4SAndreas Dilger } 92ac27a0ecSDave Kleikamp 93ac27a0ecSDave Kleikamp /* 94ac27a0ecSDave Kleikamp * Read the inode allocation bitmap for a given block_group, reading 95ac27a0ecSDave Kleikamp * into the specified slot in the superblock's bitmap cache. 96ac27a0ecSDave Kleikamp * 97ac27a0ecSDave Kleikamp * Return buffer_head of bitmap on success or NULL. 98ac27a0ecSDave Kleikamp */ 99ac27a0ecSDave Kleikamp static struct buffer_head * 100e29d1cdeSEric Sandeen ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) 101ac27a0ecSDave Kleikamp { 102617ba13bSMingming Cao struct ext4_group_desc *desc; 103ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 104e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 105ac27a0ecSDave Kleikamp 106617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 107ac27a0ecSDave Kleikamp if (!desc) 108e29d1cdeSEric Sandeen return NULL; 109e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 110e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 111e29d1cdeSEric Sandeen if (unlikely(!bh)) { 112e29d1cdeSEric Sandeen ext4_error(sb, __func__, 113ac27a0ecSDave Kleikamp "Cannot read inode bitmap - " 114bd81d8eeSLaurent Vivier "block_group = %lu, inode_bitmap = %llu", 115e29d1cdeSEric Sandeen block_group, bitmap_blk); 116e29d1cdeSEric Sandeen return NULL; 117e29d1cdeSEric Sandeen } 118c806e68fSFrederic Bohe if (buffer_uptodate(bh) && 119c806e68fSFrederic Bohe !(desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) 120e29d1cdeSEric Sandeen return bh; 121e29d1cdeSEric Sandeen 122c806e68fSFrederic Bohe lock_buffer(bh); 123b5f10eedSEric Sandeen spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group)); 124e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 125e29d1cdeSEric Sandeen ext4_init_inode_bitmap(sb, bh, block_group, desc); 126e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 127e29d1cdeSEric Sandeen unlock_buffer(bh); 128b5f10eedSEric Sandeen spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group)); 129e29d1cdeSEric Sandeen return bh; 130e29d1cdeSEric Sandeen } 131b5f10eedSEric Sandeen spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group)); 132e29d1cdeSEric Sandeen if (bh_submit_read(bh) < 0) { 133e29d1cdeSEric Sandeen put_bh(bh); 134e29d1cdeSEric Sandeen ext4_error(sb, __func__, 135e29d1cdeSEric Sandeen "Cannot read inode bitmap - " 136e29d1cdeSEric Sandeen "block_group = %lu, inode_bitmap = %llu", 137e29d1cdeSEric Sandeen block_group, bitmap_blk); 138e29d1cdeSEric Sandeen return NULL; 139e29d1cdeSEric Sandeen } 140ac27a0ecSDave Kleikamp return bh; 141ac27a0ecSDave Kleikamp } 142ac27a0ecSDave Kleikamp 143ac27a0ecSDave Kleikamp /* 144ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 145ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 146ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 147ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 148ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 149ac27a0ecSDave Kleikamp * has been deleted earlier. 150ac27a0ecSDave Kleikamp * 151ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 152ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 153ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 154ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 155ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 156ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 157ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 158ac27a0ecSDave Kleikamp */ 159617ba13bSMingming Cao void ext4_free_inode(handle_t *handle, struct inode *inode) 160ac27a0ecSDave Kleikamp { 161ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 162ac27a0ecSDave Kleikamp int is_directory; 163ac27a0ecSDave Kleikamp unsigned long ino; 164ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 165ac27a0ecSDave Kleikamp struct buffer_head *bh2; 166fd2d4291SAvantika Mathur ext4_group_t block_group; 167ac27a0ecSDave Kleikamp unsigned long bit; 168617ba13bSMingming Cao struct ext4_group_desc *gdp; 169617ba13bSMingming Cao struct ext4_super_block *es; 170617ba13bSMingming Cao struct ext4_sb_info *sbi; 171ac27a0ecSDave Kleikamp int fatal = 0, err; 172772cb7c8SJose R. Santos ext4_group_t flex_group; 173ac27a0ecSDave Kleikamp 174ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 1754776004fSTheodore Ts'o printk(KERN_ERR "ext4_free_inode: inode has count=%d\n", 176ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 177ac27a0ecSDave Kleikamp return; 178ac27a0ecSDave Kleikamp } 179ac27a0ecSDave Kleikamp if (inode->i_nlink) { 1804776004fSTheodore Ts'o printk(KERN_ERR "ext4_free_inode: inode has nlink=%d\n", 181ac27a0ecSDave Kleikamp inode->i_nlink); 182ac27a0ecSDave Kleikamp return; 183ac27a0ecSDave Kleikamp } 184ac27a0ecSDave Kleikamp if (!sb) { 1854776004fSTheodore Ts'o printk(KERN_ERR "ext4_free_inode: inode on " 1864776004fSTheodore Ts'o "nonexistent device\n"); 187ac27a0ecSDave Kleikamp return; 188ac27a0ecSDave Kleikamp } 189617ba13bSMingming Cao sbi = EXT4_SB(sb); 190ac27a0ecSDave Kleikamp 191ac27a0ecSDave Kleikamp ino = inode->i_ino; 192617ba13bSMingming Cao ext4_debug("freeing inode %lu\n", ino); 193ac27a0ecSDave Kleikamp 194ac27a0ecSDave Kleikamp /* 195ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 196ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 197ac27a0ecSDave Kleikamp */ 198ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 199617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 200ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 201ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 202ac27a0ecSDave Kleikamp 203ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 204ac27a0ecSDave Kleikamp 205ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 206ac27a0ecSDave Kleikamp clear_inode(inode); 207ac27a0ecSDave Kleikamp 208617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 209617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 210617ba13bSMingming Cao ext4_error(sb, "ext4_free_inode", 211ac27a0ecSDave Kleikamp "reserved or nonexistent inode %lu", ino); 212ac27a0ecSDave Kleikamp goto error_return; 213ac27a0ecSDave Kleikamp } 214617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 215617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 216e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 217ac27a0ecSDave Kleikamp if (!bitmap_bh) 218ac27a0ecSDave Kleikamp goto error_return; 219ac27a0ecSDave Kleikamp 220ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 221617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 222ac27a0ecSDave Kleikamp if (fatal) 223ac27a0ecSDave Kleikamp goto error_return; 224ac27a0ecSDave Kleikamp 225ac27a0ecSDave Kleikamp /* Ok, now we can actually update the inode bitmaps.. */ 226617ba13bSMingming Cao if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), 227ac27a0ecSDave Kleikamp bit, bitmap_bh->b_data)) 228617ba13bSMingming Cao ext4_error(sb, "ext4_free_inode", 229ac27a0ecSDave Kleikamp "bit already cleared for inode %lu", ino); 230ac27a0ecSDave Kleikamp else { 231617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, block_group, &bh2); 232ac27a0ecSDave Kleikamp 233ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 234617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 235ac27a0ecSDave Kleikamp if (fatal) goto error_return; 236ac27a0ecSDave Kleikamp 237ac27a0ecSDave Kleikamp if (gdp) { 238ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, block_group)); 239e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_free_inodes_count, 1); 240ac27a0ecSDave Kleikamp if (is_directory) 241e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_used_dirs_count, -1); 242717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, 243717d50e4SAndreas Dilger block_group, gdp); 244ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, block_group)); 245ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_freeinodes_counter); 246ac27a0ecSDave Kleikamp if (is_directory) 247ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_dirs_counter); 248ac27a0ecSDave Kleikamp 249772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 250772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, block_group); 251772cb7c8SJose R. Santos spin_lock(sb_bgl_lock(sbi, flex_group)); 252772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes++; 253772cb7c8SJose R. Santos spin_unlock(sb_bgl_lock(sbi, flex_group)); 254772cb7c8SJose R. Santos } 255ac27a0ecSDave Kleikamp } 256617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 257617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 258ac27a0ecSDave Kleikamp if (!fatal) fatal = err; 259ac27a0ecSDave Kleikamp } 260617ba13bSMingming Cao BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata"); 261617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bitmap_bh); 262ac27a0ecSDave Kleikamp if (!fatal) 263ac27a0ecSDave Kleikamp fatal = err; 264ac27a0ecSDave Kleikamp sb->s_dirt = 1; 265ac27a0ecSDave Kleikamp error_return: 266ac27a0ecSDave Kleikamp brelse(bitmap_bh); 267617ba13bSMingming Cao ext4_std_error(sb, fatal); 268ac27a0ecSDave Kleikamp } 269ac27a0ecSDave Kleikamp 270ac27a0ecSDave Kleikamp /* 271ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 272ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 273ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 274ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 275ac27a0ecSDave Kleikamp * directories already is chosen. 276ac27a0ecSDave Kleikamp * 277ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory\'s block 278ac27a0ecSDave Kleikamp * group to find a free inode. 279ac27a0ecSDave Kleikamp */ 2802aa9fc4cSAvantika Mathur static int find_group_dir(struct super_block *sb, struct inode *parent, 2812aa9fc4cSAvantika Mathur ext4_group_t *best_group) 282ac27a0ecSDave Kleikamp { 283fd2d4291SAvantika Mathur ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 284ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 285617ba13bSMingming Cao struct ext4_group_desc *desc, *best_desc = NULL; 2862aa9fc4cSAvantika Mathur ext4_group_t group; 2872aa9fc4cSAvantika Mathur int ret = -1; 288ac27a0ecSDave Kleikamp 289617ba13bSMingming Cao freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter); 290ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 291ac27a0ecSDave Kleikamp 292ac27a0ecSDave Kleikamp for (group = 0; group < ngroups; group++) { 293ef2fb679SEric Sandeen desc = ext4_get_group_desc(sb, group, NULL); 294ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 295ac27a0ecSDave Kleikamp continue; 296ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 297ac27a0ecSDave Kleikamp continue; 298ac27a0ecSDave Kleikamp if (!best_desc || 299ac27a0ecSDave Kleikamp (le16_to_cpu(desc->bg_free_blocks_count) > 300ac27a0ecSDave Kleikamp le16_to_cpu(best_desc->bg_free_blocks_count))) { 3012aa9fc4cSAvantika Mathur *best_group = group; 302ac27a0ecSDave Kleikamp best_desc = desc; 3032aa9fc4cSAvantika Mathur ret = 0; 304ac27a0ecSDave Kleikamp } 305ac27a0ecSDave Kleikamp } 3062aa9fc4cSAvantika Mathur return ret; 307ac27a0ecSDave Kleikamp } 308ac27a0ecSDave Kleikamp 309772cb7c8SJose R. Santos #define free_block_ratio 10 310772cb7c8SJose R. Santos 311772cb7c8SJose R. Santos static int find_group_flex(struct super_block *sb, struct inode *parent, 312772cb7c8SJose R. Santos ext4_group_t *best_group) 313772cb7c8SJose R. Santos { 314772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 315772cb7c8SJose R. Santos struct ext4_group_desc *desc; 316772cb7c8SJose R. Santos struct buffer_head *bh; 317772cb7c8SJose R. Santos struct flex_groups *flex_group = sbi->s_flex_groups; 318772cb7c8SJose R. Santos ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 319772cb7c8SJose R. Santos ext4_group_t parent_fbg_group = ext4_flex_group(sbi, parent_group); 320772cb7c8SJose R. Santos ext4_group_t ngroups = sbi->s_groups_count; 321772cb7c8SJose R. Santos int flex_size = ext4_flex_bg_size(sbi); 322772cb7c8SJose R. Santos ext4_group_t best_flex = parent_fbg_group; 323772cb7c8SJose R. Santos int blocks_per_flex = sbi->s_blocks_per_group * flex_size; 324772cb7c8SJose R. Santos int flexbg_free_blocks; 325772cb7c8SJose R. Santos int flex_freeb_ratio; 326772cb7c8SJose R. Santos ext4_group_t n_fbg_groups; 327772cb7c8SJose R. Santos ext4_group_t i; 328772cb7c8SJose R. Santos 329772cb7c8SJose R. Santos n_fbg_groups = (sbi->s_groups_count + flex_size - 1) >> 330772cb7c8SJose R. Santos sbi->s_log_groups_per_flex; 331772cb7c8SJose R. Santos 332772cb7c8SJose R. Santos find_close_to_parent: 333772cb7c8SJose R. Santos flexbg_free_blocks = flex_group[best_flex].free_blocks; 334772cb7c8SJose R. Santos flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex; 335772cb7c8SJose R. Santos if (flex_group[best_flex].free_inodes && 336772cb7c8SJose R. Santos flex_freeb_ratio > free_block_ratio) 337772cb7c8SJose R. Santos goto found_flexbg; 338772cb7c8SJose R. Santos 339772cb7c8SJose R. Santos if (best_flex && best_flex == parent_fbg_group) { 340772cb7c8SJose R. Santos best_flex--; 341772cb7c8SJose R. Santos goto find_close_to_parent; 342772cb7c8SJose R. Santos } 343772cb7c8SJose R. Santos 344772cb7c8SJose R. Santos for (i = 0; i < n_fbg_groups; i++) { 345772cb7c8SJose R. Santos if (i == parent_fbg_group || i == parent_fbg_group - 1) 346772cb7c8SJose R. Santos continue; 347772cb7c8SJose R. Santos 348772cb7c8SJose R. Santos flexbg_free_blocks = flex_group[i].free_blocks; 349772cb7c8SJose R. Santos flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex; 350772cb7c8SJose R. Santos 351772cb7c8SJose R. Santos if (flex_freeb_ratio > free_block_ratio && 352772cb7c8SJose R. Santos flex_group[i].free_inodes) { 353772cb7c8SJose R. Santos best_flex = i; 354772cb7c8SJose R. Santos goto found_flexbg; 355772cb7c8SJose R. Santos } 356772cb7c8SJose R. Santos 357c001077fSEric Sandeen if (flex_group[best_flex].free_inodes == 0 || 358772cb7c8SJose R. Santos (flex_group[i].free_blocks > 359772cb7c8SJose R. Santos flex_group[best_flex].free_blocks && 360772cb7c8SJose R. Santos flex_group[i].free_inodes)) 361772cb7c8SJose R. Santos best_flex = i; 362772cb7c8SJose R. Santos } 363772cb7c8SJose R. Santos 364772cb7c8SJose R. Santos if (!flex_group[best_flex].free_inodes || 365772cb7c8SJose R. Santos !flex_group[best_flex].free_blocks) 366772cb7c8SJose R. Santos return -1; 367772cb7c8SJose R. Santos 368772cb7c8SJose R. Santos found_flexbg: 369772cb7c8SJose R. Santos for (i = best_flex * flex_size; i < ngroups && 370772cb7c8SJose R. Santos i < (best_flex + 1) * flex_size; i++) { 371772cb7c8SJose R. Santos desc = ext4_get_group_desc(sb, i, &bh); 372772cb7c8SJose R. Santos if (le16_to_cpu(desc->bg_free_inodes_count)) { 373772cb7c8SJose R. Santos *best_group = i; 374772cb7c8SJose R. Santos goto out; 375772cb7c8SJose R. Santos } 376772cb7c8SJose R. Santos } 377772cb7c8SJose R. Santos 378772cb7c8SJose R. Santos return -1; 379772cb7c8SJose R. Santos out: 380772cb7c8SJose R. Santos return 0; 381772cb7c8SJose R. Santos } 382772cb7c8SJose R. Santos 383ac27a0ecSDave Kleikamp /* 384ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 385ac27a0ecSDave Kleikamp * 386ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 387ac27a0ecSDave Kleikamp * 388ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 389ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 390ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 391ac27a0ecSDave Kleikamp * 392ac27a0ecSDave Kleikamp * For the rest rules look so: 393ac27a0ecSDave Kleikamp * 394ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 395ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 396ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 397ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 398ac27a0ecSDave Kleikamp * it's already running too large debt (max_debt). 3991cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 400ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 401ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 402ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 403ac27a0ecSDave Kleikamp * 404ac27a0ecSDave Kleikamp * Debt is incremented each time we allocate a directory and decremented 405ac27a0ecSDave Kleikamp * when we allocate an inode, within 0--255. 406ac27a0ecSDave Kleikamp */ 407ac27a0ecSDave Kleikamp 408ac27a0ecSDave Kleikamp #define INODE_COST 64 409ac27a0ecSDave Kleikamp #define BLOCK_COST 256 410ac27a0ecSDave Kleikamp 4112aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 4122aa9fc4cSAvantika Mathur ext4_group_t *group) 413ac27a0ecSDave Kleikamp { 414fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 415617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 416617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 417fd2d4291SAvantika Mathur ext4_group_t ngroups = sbi->s_groups_count; 418617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 419ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 420617ba13bSMingming Cao ext4_fsblk_t freeb, avefreeb; 421617ba13bSMingming Cao ext4_fsblk_t blocks_per_dir; 422ac27a0ecSDave Kleikamp unsigned int ndirs; 423ac27a0ecSDave Kleikamp int max_debt, max_dirs, min_inodes; 424617ba13bSMingming Cao ext4_grpblk_t min_blocks; 4252aa9fc4cSAvantika Mathur ext4_group_t i; 426617ba13bSMingming Cao struct ext4_group_desc *desc; 427ac27a0ecSDave Kleikamp 428ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 429ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 430ac27a0ecSDave Kleikamp freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); 4313a5b2ecdSMingming Cao avefreeb = freeb; 432f4e5bc24SAndrew Morton do_div(avefreeb, ngroups); 433ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 434ac27a0ecSDave Kleikamp 435ac27a0ecSDave Kleikamp if ((parent == sb->s_root->d_inode) || 436617ba13bSMingming Cao (EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) { 437ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4382aa9fc4cSAvantika Mathur ext4_group_t grp; 4392aa9fc4cSAvantika Mathur int ret = -1; 440ac27a0ecSDave Kleikamp 4412aa9fc4cSAvantika Mathur get_random_bytes(&grp, sizeof(grp)); 4422aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 443ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4442aa9fc4cSAvantika Mathur grp = (parent_group + i) % ngroups; 4452aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, grp, NULL); 446ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 447ac27a0ecSDave Kleikamp continue; 448ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) 449ac27a0ecSDave Kleikamp continue; 450ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 451ac27a0ecSDave Kleikamp continue; 452ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) 453ac27a0ecSDave Kleikamp continue; 4542aa9fc4cSAvantika Mathur *group = grp; 4552aa9fc4cSAvantika Mathur ret = 0; 456ac27a0ecSDave Kleikamp best_ndir = le16_to_cpu(desc->bg_used_dirs_count); 457ac27a0ecSDave Kleikamp } 4582aa9fc4cSAvantika Mathur if (ret == 0) 4592aa9fc4cSAvantika Mathur return ret; 460ac27a0ecSDave Kleikamp goto fallback; 461ac27a0ecSDave Kleikamp } 462ac27a0ecSDave Kleikamp 463bd81d8eeSLaurent Vivier blocks_per_dir = ext4_blocks_count(es) - freeb; 464f4e5bc24SAndrew Morton do_div(blocks_per_dir, ndirs); 465ac27a0ecSDave Kleikamp 466ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 467ac27a0ecSDave Kleikamp min_inodes = avefreei - inodes_per_group / 4; 468617ba13bSMingming Cao min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4; 469ac27a0ecSDave Kleikamp 4703a5b2ecdSMingming Cao max_debt = EXT4_BLOCKS_PER_GROUP(sb); 471f4e5bc24SAndrew Morton max_debt /= max_t(int, blocks_per_dir, BLOCK_COST); 472ac27a0ecSDave Kleikamp if (max_debt * INODE_COST > inodes_per_group) 473ac27a0ecSDave Kleikamp max_debt = inodes_per_group / INODE_COST; 474ac27a0ecSDave Kleikamp if (max_debt > 255) 475ac27a0ecSDave Kleikamp max_debt = 255; 476ac27a0ecSDave Kleikamp if (max_debt == 0) 477ac27a0ecSDave Kleikamp max_debt = 1; 478ac27a0ecSDave Kleikamp 479ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4802aa9fc4cSAvantika Mathur *group = (parent_group + i) % ngroups; 4812aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 482ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 483ac27a0ecSDave Kleikamp continue; 484ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) 485ac27a0ecSDave Kleikamp continue; 486ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) 487ac27a0ecSDave Kleikamp continue; 488ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) 489ac27a0ecSDave Kleikamp continue; 4902aa9fc4cSAvantika Mathur return 0; 491ac27a0ecSDave Kleikamp } 492ac27a0ecSDave Kleikamp 493ac27a0ecSDave Kleikamp fallback: 494ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4952aa9fc4cSAvantika Mathur *group = (parent_group + i) % ngroups; 4962aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 4972aa9fc4cSAvantika Mathur if (desc && desc->bg_free_inodes_count && 4982aa9fc4cSAvantika Mathur le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) 4992aa9fc4cSAvantika Mathur return 0; 500ac27a0ecSDave Kleikamp } 501ac27a0ecSDave Kleikamp 502ac27a0ecSDave Kleikamp if (avefreei) { 503ac27a0ecSDave Kleikamp /* 504ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 505ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 506ac27a0ecSDave Kleikamp */ 507ac27a0ecSDave Kleikamp avefreei = 0; 508ac27a0ecSDave Kleikamp goto fallback; 509ac27a0ecSDave Kleikamp } 510ac27a0ecSDave Kleikamp 511ac27a0ecSDave Kleikamp return -1; 512ac27a0ecSDave Kleikamp } 513ac27a0ecSDave Kleikamp 5142aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 5152aa9fc4cSAvantika Mathur ext4_group_t *group) 516ac27a0ecSDave Kleikamp { 517fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 518fd2d4291SAvantika Mathur ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 519617ba13bSMingming Cao struct ext4_group_desc *desc; 5202aa9fc4cSAvantika Mathur ext4_group_t i; 521ac27a0ecSDave Kleikamp 522ac27a0ecSDave Kleikamp /* 523ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 524ac27a0ecSDave Kleikamp */ 5252aa9fc4cSAvantika Mathur *group = parent_group; 5262aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 527ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 528ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 5292aa9fc4cSAvantika Mathur return 0; 530ac27a0ecSDave Kleikamp 531ac27a0ecSDave Kleikamp /* 532ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 533ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 534ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 535ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 536ac27a0ecSDave Kleikamp * different blockgroup. 537ac27a0ecSDave Kleikamp * 538ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 539ac27a0ecSDave Kleikamp */ 5402aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 541ac27a0ecSDave Kleikamp 542ac27a0ecSDave Kleikamp /* 543ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 544ac27a0ecSDave Kleikamp * blocks. 545ac27a0ecSDave Kleikamp */ 546ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 5472aa9fc4cSAvantika Mathur *group += i; 5482aa9fc4cSAvantika Mathur if (*group >= ngroups) 5492aa9fc4cSAvantika Mathur *group -= ngroups; 5502aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 551ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 552ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 5532aa9fc4cSAvantika Mathur return 0; 554ac27a0ecSDave Kleikamp } 555ac27a0ecSDave Kleikamp 556ac27a0ecSDave Kleikamp /* 557ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 558ac27a0ecSDave Kleikamp * has no free blocks. 559ac27a0ecSDave Kleikamp */ 5602aa9fc4cSAvantika Mathur *group = parent_group; 561ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 5622aa9fc4cSAvantika Mathur if (++*group >= ngroups) 5632aa9fc4cSAvantika Mathur *group = 0; 5642aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 565ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count)) 5662aa9fc4cSAvantika Mathur return 0; 567ac27a0ecSDave Kleikamp } 568ac27a0ecSDave Kleikamp 569ac27a0ecSDave Kleikamp return -1; 570ac27a0ecSDave Kleikamp } 571ac27a0ecSDave Kleikamp 572ac27a0ecSDave Kleikamp /* 573ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 574ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 575ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 576ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 577ac27a0ecSDave Kleikamp * directories already is chosen. 578ac27a0ecSDave Kleikamp * 579ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 580ac27a0ecSDave Kleikamp * group to find a free inode. 581ac27a0ecSDave Kleikamp */ 582617ba13bSMingming Cao struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode) 583ac27a0ecSDave Kleikamp { 584ac27a0ecSDave Kleikamp struct super_block *sb; 585ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 586ac27a0ecSDave Kleikamp struct buffer_head *bh2; 5872aa9fc4cSAvantika Mathur ext4_group_t group = 0; 588ac27a0ecSDave Kleikamp unsigned long ino = 0; 589ac27a0ecSDave Kleikamp struct inode *inode; 590617ba13bSMingming Cao struct ext4_group_desc *gdp = NULL; 591617ba13bSMingming Cao struct ext4_super_block *es; 592617ba13bSMingming Cao struct ext4_inode_info *ei; 593617ba13bSMingming Cao struct ext4_sb_info *sbi; 5942aa9fc4cSAvantika Mathur int ret2, err = 0; 595ac27a0ecSDave Kleikamp struct inode *ret; 5962aa9fc4cSAvantika Mathur ext4_group_t i; 5972aa9fc4cSAvantika Mathur int free = 0; 598772cb7c8SJose R. Santos ext4_group_t flex_group; 599ac27a0ecSDave Kleikamp 600ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 601ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 602ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 603ac27a0ecSDave Kleikamp 604ac27a0ecSDave Kleikamp sb = dir->i_sb; 605ac27a0ecSDave Kleikamp inode = new_inode(sb); 606ac27a0ecSDave Kleikamp if (!inode) 607ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 608617ba13bSMingming Cao ei = EXT4_I(inode); 609ac27a0ecSDave Kleikamp 610617ba13bSMingming Cao sbi = EXT4_SB(sb); 611ac27a0ecSDave Kleikamp es = sbi->s_es; 612772cb7c8SJose R. Santos 613772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 614772cb7c8SJose R. Santos ret2 = find_group_flex(sb, dir, &group); 615772cb7c8SJose R. Santos goto got_group; 616772cb7c8SJose R. Santos } 617772cb7c8SJose R. Santos 618ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 619ac27a0ecSDave Kleikamp if (test_opt(sb, OLDALLOC)) 6202aa9fc4cSAvantika Mathur ret2 = find_group_dir(sb, dir, &group); 621ac27a0ecSDave Kleikamp else 6222aa9fc4cSAvantika Mathur ret2 = find_group_orlov(sb, dir, &group); 623ac27a0ecSDave Kleikamp } else 6242aa9fc4cSAvantika Mathur ret2 = find_group_other(sb, dir, &group); 625ac27a0ecSDave Kleikamp 626772cb7c8SJose R. Santos got_group: 627ac27a0ecSDave Kleikamp err = -ENOSPC; 6282aa9fc4cSAvantika Mathur if (ret2 == -1) 629ac27a0ecSDave Kleikamp goto out; 630ac27a0ecSDave Kleikamp 631ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_groups_count; i++) { 632ac27a0ecSDave Kleikamp err = -EIO; 633ac27a0ecSDave Kleikamp 634617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, group, &bh2); 635ac27a0ecSDave Kleikamp if (!gdp) 636ac27a0ecSDave Kleikamp goto fail; 637ac27a0ecSDave Kleikamp 638ac27a0ecSDave Kleikamp brelse(bitmap_bh); 639e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, group); 640ac27a0ecSDave Kleikamp if (!bitmap_bh) 641ac27a0ecSDave Kleikamp goto fail; 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp ino = 0; 644ac27a0ecSDave Kleikamp 645ac27a0ecSDave Kleikamp repeat_in_this_group: 646617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 647617ba13bSMingming Cao bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino); 648617ba13bSMingming Cao if (ino < EXT4_INODES_PER_GROUP(sb)) { 649ac27a0ecSDave Kleikamp 650ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 651617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bitmap_bh); 652ac27a0ecSDave Kleikamp if (err) 653ac27a0ecSDave Kleikamp goto fail; 654ac27a0ecSDave Kleikamp 655617ba13bSMingming Cao if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group), 656ac27a0ecSDave Kleikamp ino, bitmap_bh->b_data)) { 657ac27a0ecSDave Kleikamp /* we won it */ 658ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, 659617ba13bSMingming Cao "call ext4_journal_dirty_metadata"); 660617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, 661ac27a0ecSDave Kleikamp bitmap_bh); 662ac27a0ecSDave Kleikamp if (err) 663ac27a0ecSDave Kleikamp goto fail; 664ac27a0ecSDave Kleikamp goto got; 665ac27a0ecSDave Kleikamp } 666ac27a0ecSDave Kleikamp /* we lost it */ 667dab291afSMingming Cao jbd2_journal_release_buffer(handle, bitmap_bh); 668ac27a0ecSDave Kleikamp 669617ba13bSMingming Cao if (++ino < EXT4_INODES_PER_GROUP(sb)) 670ac27a0ecSDave Kleikamp goto repeat_in_this_group; 671ac27a0ecSDave Kleikamp } 672ac27a0ecSDave Kleikamp 673ac27a0ecSDave Kleikamp /* 674ac27a0ecSDave Kleikamp * This case is possible in concurrent environment. It is very 675ac27a0ecSDave Kleikamp * rare. We cannot repeat the find_group_xxx() call because 676ac27a0ecSDave Kleikamp * that will simply return the same blockgroup, because the 677ac27a0ecSDave Kleikamp * group descriptor metadata has not yet been updated. 678ac27a0ecSDave Kleikamp * So we just go onto the next blockgroup. 679ac27a0ecSDave Kleikamp */ 680ac27a0ecSDave Kleikamp if (++group == sbi->s_groups_count) 681ac27a0ecSDave Kleikamp group = 0; 682ac27a0ecSDave Kleikamp } 683ac27a0ecSDave Kleikamp err = -ENOSPC; 684ac27a0ecSDave Kleikamp goto out; 685ac27a0ecSDave Kleikamp 686ac27a0ecSDave Kleikamp got: 687717d50e4SAndreas Dilger ino++; 688717d50e4SAndreas Dilger if ((group == 0 && ino < EXT4_FIRST_INO(sb)) || 689717d50e4SAndreas Dilger ino > EXT4_INODES_PER_GROUP(sb)) { 69046e665e9SHarvey Harrison ext4_error(sb, __func__, 691ac27a0ecSDave Kleikamp "reserved inode or inode > inodes count - " 692fd2d4291SAvantika Mathur "block_group = %lu, inode=%lu", group, 693717d50e4SAndreas Dilger ino + group * EXT4_INODES_PER_GROUP(sb)); 694ac27a0ecSDave Kleikamp err = -EIO; 695ac27a0ecSDave Kleikamp goto fail; 696ac27a0ecSDave Kleikamp } 697ac27a0ecSDave Kleikamp 698ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 699617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh2); 700ac27a0ecSDave Kleikamp if (err) goto fail; 701717d50e4SAndreas Dilger 702717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 703717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 704717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 705574ca174STheodore Ts'o struct buffer_head *block_bh = ext4_read_block_bitmap(sb, group); 706717d50e4SAndreas Dilger 707717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "get block bitmap access"); 708717d50e4SAndreas Dilger err = ext4_journal_get_write_access(handle, block_bh); 709717d50e4SAndreas Dilger if (err) { 710717d50e4SAndreas Dilger brelse(block_bh); 711717d50e4SAndreas Dilger goto fail; 712717d50e4SAndreas Dilger } 713717d50e4SAndreas Dilger 714717d50e4SAndreas Dilger free = 0; 715ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, group)); 716717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 717717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 718717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 719717d50e4SAndreas Dilger free = ext4_free_blocks_after_init(sb, group, gdp); 720717d50e4SAndreas Dilger gdp->bg_free_blocks_count = cpu_to_le16(free); 721717d50e4SAndreas Dilger } 722717d50e4SAndreas Dilger spin_unlock(sb_bgl_lock(sbi, group)); 723717d50e4SAndreas Dilger 724717d50e4SAndreas Dilger /* Don't need to dirty bitmap block if we didn't change it */ 725717d50e4SAndreas Dilger if (free) { 726717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "dirty block bitmap"); 727717d50e4SAndreas Dilger err = ext4_journal_dirty_metadata(handle, block_bh); 728717d50e4SAndreas Dilger } 729717d50e4SAndreas Dilger 730717d50e4SAndreas Dilger brelse(block_bh); 731717d50e4SAndreas Dilger if (err) 732717d50e4SAndreas Dilger goto fail; 733717d50e4SAndreas Dilger } 734717d50e4SAndreas Dilger 735717d50e4SAndreas Dilger spin_lock(sb_bgl_lock(sbi, group)); 736717d50e4SAndreas Dilger /* If we didn't allocate from within the initialized part of the inode 737717d50e4SAndreas Dilger * table then we need to initialize up to this inode. */ 738717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 739717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 740717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 741717d50e4SAndreas Dilger 742717d50e4SAndreas Dilger /* When marking the block group with 743717d50e4SAndreas Dilger * ~EXT4_BG_INODE_UNINIT we don't want to depend 744b5f10eedSEric Sandeen * on the value of bg_itable_unused even though 745717d50e4SAndreas Dilger * mke2fs could have initialized the same for us. 746717d50e4SAndreas Dilger * Instead we calculated the value below 747717d50e4SAndreas Dilger */ 748717d50e4SAndreas Dilger 749717d50e4SAndreas Dilger free = 0; 750717d50e4SAndreas Dilger } else { 751717d50e4SAndreas Dilger free = EXT4_INODES_PER_GROUP(sb) - 752717d50e4SAndreas Dilger le16_to_cpu(gdp->bg_itable_unused); 753717d50e4SAndreas Dilger } 754717d50e4SAndreas Dilger 755717d50e4SAndreas Dilger /* 756717d50e4SAndreas Dilger * Check the relative inode number against the last used 757717d50e4SAndreas Dilger * relative inode number in this group. if it is greater 758717d50e4SAndreas Dilger * we need to update the bg_itable_unused count 759717d50e4SAndreas Dilger * 760717d50e4SAndreas Dilger */ 761717d50e4SAndreas Dilger if (ino > free) 762717d50e4SAndreas Dilger gdp->bg_itable_unused = 763717d50e4SAndreas Dilger cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino); 764717d50e4SAndreas Dilger } 765717d50e4SAndreas Dilger 766e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_free_inodes_count, -1); 767ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 768e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_used_dirs_count, 1); 769ac27a0ecSDave Kleikamp } 770717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 771ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, group)); 772617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 773617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 774ac27a0ecSDave Kleikamp if (err) goto fail; 775ac27a0ecSDave Kleikamp 776ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 777ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 778ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 779ac27a0ecSDave Kleikamp sb->s_dirt = 1; 780ac27a0ecSDave Kleikamp 781772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 782772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 783772cb7c8SJose R. Santos spin_lock(sb_bgl_lock(sbi, flex_group)); 784772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes--; 785772cb7c8SJose R. Santos spin_unlock(sb_bgl_lock(sbi, flex_group)); 786772cb7c8SJose R. Santos } 787772cb7c8SJose R. Santos 788*4c9c544eSDavid Howells inode->i_uid = current_fsuid(); 789ac27a0ecSDave Kleikamp if (test_opt(sb, GRPID)) 790ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 791ac27a0ecSDave Kleikamp else if (dir->i_mode & S_ISGID) { 792ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 793ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 794ac27a0ecSDave Kleikamp mode |= S_ISGID; 795ac27a0ecSDave Kleikamp } else 796*4c9c544eSDavid Howells inode->i_gid = current_fsgid(); 797ac27a0ecSDave Kleikamp inode->i_mode = mode; 798ac27a0ecSDave Kleikamp 799717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 800ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 801ac27a0ecSDave Kleikamp inode->i_blocks = 0; 802ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 803ef7f3835SKalpak Shah ext4_current_time(inode); 804ac27a0ecSDave Kleikamp 805ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 806ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 807ac27a0ecSDave Kleikamp ei->i_disksize = 0; 808ac27a0ecSDave Kleikamp 80942bf0383SAneesh Kumar K.V /* 81042bf0383SAneesh Kumar K.V * Don't inherit extent flag from directory. We set extent flag on 81142bf0383SAneesh Kumar K.V * newly created directory and file only if -o extent mount option is 81242bf0383SAneesh Kumar K.V * specified 81342bf0383SAneesh Kumar K.V */ 81442bf0383SAneesh Kumar K.V ei->i_flags = EXT4_I(dir)->i_flags & ~(EXT4_INDEX_FL|EXT4_EXTENTS_FL); 815ac27a0ecSDave Kleikamp if (S_ISLNK(mode)) 816617ba13bSMingming Cao ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL); 817ac27a0ecSDave Kleikamp /* dirsync only applies to directories */ 818ac27a0ecSDave Kleikamp if (!S_ISDIR(mode)) 819617ba13bSMingming Cao ei->i_flags &= ~EXT4_DIRSYNC_FL; 820ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 821ac27a0ecSDave Kleikamp ei->i_dtime = 0; 822ac27a0ecSDave Kleikamp ei->i_block_group = group; 823ac27a0ecSDave Kleikamp 824617ba13bSMingming Cao ext4_set_inode_flags(inode); 825ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 826ac27a0ecSDave Kleikamp handle->h_sync = 1; 827ac27a0ecSDave Kleikamp insert_inode_hash(inode); 828ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 829ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 830ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 831ac27a0ecSDave Kleikamp 832617ba13bSMingming Cao ei->i_state = EXT4_STATE_NEW; 833ef7f3835SKalpak Shah 834ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 835ac27a0ecSDave Kleikamp 836ac27a0ecSDave Kleikamp ret = inode; 837ac27a0ecSDave Kleikamp if (DQUOT_ALLOC_INODE(inode)) { 838ac27a0ecSDave Kleikamp err = -EDQUOT; 839ac27a0ecSDave Kleikamp goto fail_drop; 840ac27a0ecSDave Kleikamp } 841ac27a0ecSDave Kleikamp 842617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 843ac27a0ecSDave Kleikamp if (err) 844ac27a0ecSDave Kleikamp goto fail_free_drop; 845ac27a0ecSDave Kleikamp 846617ba13bSMingming Cao err = ext4_init_security(handle, inode, dir); 847ac27a0ecSDave Kleikamp if (err) 848ac27a0ecSDave Kleikamp goto fail_free_drop; 849ac27a0ecSDave Kleikamp 850a86c6181SAlex Tomas if (test_opt(sb, EXTENTS)) { 851e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 852e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 853a86c6181SAlex Tomas EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL; 854a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 855a86c6181SAlex Tomas } 85642bf0383SAneesh Kumar K.V } 857ac27a0ecSDave Kleikamp 8588753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 8598753e88fSAneesh Kumar K.V if (err) { 8608753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 8618753e88fSAneesh Kumar K.V goto fail_free_drop; 8628753e88fSAneesh Kumar K.V } 8638753e88fSAneesh Kumar K.V 864617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 865ac27a0ecSDave Kleikamp goto really_out; 866ac27a0ecSDave Kleikamp fail: 867617ba13bSMingming Cao ext4_std_error(sb, err); 868ac27a0ecSDave Kleikamp out: 869ac27a0ecSDave Kleikamp iput(inode); 870ac27a0ecSDave Kleikamp ret = ERR_PTR(err); 871ac27a0ecSDave Kleikamp really_out: 872ac27a0ecSDave Kleikamp brelse(bitmap_bh); 873ac27a0ecSDave Kleikamp return ret; 874ac27a0ecSDave Kleikamp 875ac27a0ecSDave Kleikamp fail_free_drop: 876ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 877ac27a0ecSDave Kleikamp 878ac27a0ecSDave Kleikamp fail_drop: 879ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 880ac27a0ecSDave Kleikamp inode->i_flags |= S_NOQUOTA; 881ac27a0ecSDave Kleikamp inode->i_nlink = 0; 882ac27a0ecSDave Kleikamp iput(inode); 883ac27a0ecSDave Kleikamp brelse(bitmap_bh); 884ac27a0ecSDave Kleikamp return ERR_PTR(err); 885ac27a0ecSDave Kleikamp } 886ac27a0ecSDave Kleikamp 887ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 888617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 889ac27a0ecSDave Kleikamp { 890617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 891fd2d4291SAvantika Mathur ext4_group_t block_group; 892ac27a0ecSDave Kleikamp int bit; 8931d1fe1eeSDavid Howells struct buffer_head *bitmap_bh; 894ac27a0ecSDave Kleikamp struct inode *inode = NULL; 8951d1fe1eeSDavid Howells long err = -EIO; 896ac27a0ecSDave Kleikamp 897ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 898ac27a0ecSDave Kleikamp if (ino > max_ino) { 89946e665e9SHarvey Harrison ext4_warning(sb, __func__, 900ac27a0ecSDave Kleikamp "bad orphan ino %lu! e2fsck was run?", ino); 9011d1fe1eeSDavid Howells goto error; 902ac27a0ecSDave Kleikamp } 903ac27a0ecSDave Kleikamp 904617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 905617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 906e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 907ac27a0ecSDave Kleikamp if (!bitmap_bh) { 90846e665e9SHarvey Harrison ext4_warning(sb, __func__, 909ac27a0ecSDave Kleikamp "inode bitmap error for orphan %lu", ino); 9101d1fe1eeSDavid Howells goto error; 911ac27a0ecSDave Kleikamp } 912ac27a0ecSDave Kleikamp 913ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 914ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 915ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 916ac27a0ecSDave Kleikamp */ 9171d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 9181d1fe1eeSDavid Howells goto bad_orphan; 9191d1fe1eeSDavid Howells 9201d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 9211d1fe1eeSDavid Howells if (IS_ERR(inode)) 9221d1fe1eeSDavid Howells goto iget_failed; 9231d1fe1eeSDavid Howells 92491ef4cafSDuane Griffin /* 92591ef4cafSDuane Griffin * If the orphans has i_nlinks > 0 then it should be able to be 92691ef4cafSDuane Griffin * truncated, otherwise it won't be removed from the orphan list 92791ef4cafSDuane Griffin * during processing and an infinite loop will result. 92891ef4cafSDuane Griffin */ 92991ef4cafSDuane Griffin if (inode->i_nlink && !ext4_can_truncate(inode)) 93091ef4cafSDuane Griffin goto bad_orphan; 93191ef4cafSDuane Griffin 9321d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 9331d1fe1eeSDavid Howells goto bad_orphan; 9341d1fe1eeSDavid Howells brelse(bitmap_bh); 9351d1fe1eeSDavid Howells return inode; 9361d1fe1eeSDavid Howells 9371d1fe1eeSDavid Howells iget_failed: 9381d1fe1eeSDavid Howells err = PTR_ERR(inode); 9391d1fe1eeSDavid Howells inode = NULL; 9401d1fe1eeSDavid Howells bad_orphan: 94146e665e9SHarvey Harrison ext4_warning(sb, __func__, 942ac27a0ecSDave Kleikamp "bad orphan inode %lu! e2fsck was run?", ino); 943617ba13bSMingming Cao printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n", 944ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 945617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 946ac27a0ecSDave Kleikamp printk(KERN_NOTICE "inode=%p\n", inode); 947ac27a0ecSDave Kleikamp if (inode) { 948ac27a0ecSDave Kleikamp printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", 949ac27a0ecSDave Kleikamp is_bad_inode(inode)); 950ac27a0ecSDave Kleikamp printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", 951ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 952ac27a0ecSDave Kleikamp printk(KERN_NOTICE "max_ino=%lu\n", max_ino); 95391ef4cafSDuane Griffin printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); 954ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 9551d1fe1eeSDavid Howells if (inode->i_nlink == 0) 956ac27a0ecSDave Kleikamp inode->i_blocks = 0; 957ac27a0ecSDave Kleikamp iput(inode); 958ac27a0ecSDave Kleikamp } 959ac27a0ecSDave Kleikamp brelse(bitmap_bh); 9601d1fe1eeSDavid Howells error: 9611d1fe1eeSDavid Howells return ERR_PTR(err); 962ac27a0ecSDave Kleikamp } 963ac27a0ecSDave Kleikamp 964617ba13bSMingming Cao unsigned long ext4_count_free_inodes(struct super_block *sb) 965ac27a0ecSDave Kleikamp { 966ac27a0ecSDave Kleikamp unsigned long desc_count; 967617ba13bSMingming Cao struct ext4_group_desc *gdp; 968fd2d4291SAvantika Mathur ext4_group_t i; 969617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 970617ba13bSMingming Cao struct ext4_super_block *es; 971ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 972ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 973ac27a0ecSDave Kleikamp 974617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 975ac27a0ecSDave Kleikamp desc_count = 0; 976ac27a0ecSDave Kleikamp bitmap_count = 0; 977ac27a0ecSDave Kleikamp gdp = NULL; 978617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 979617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 980ac27a0ecSDave Kleikamp if (!gdp) 981ac27a0ecSDave Kleikamp continue; 982ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 983ac27a0ecSDave Kleikamp brelse(bitmap_bh); 984e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 985ac27a0ecSDave Kleikamp if (!bitmap_bh) 986ac27a0ecSDave Kleikamp continue; 987ac27a0ecSDave Kleikamp 988617ba13bSMingming Cao x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8); 989c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 990ac27a0ecSDave Kleikamp i, le16_to_cpu(gdp->bg_free_inodes_count), x); 991ac27a0ecSDave Kleikamp bitmap_count += x; 992ac27a0ecSDave Kleikamp } 993ac27a0ecSDave Kleikamp brelse(bitmap_bh); 9944776004fSTheodore Ts'o printk(KERN_DEBUG "ext4_count_free_inodes: " 9954776004fSTheodore Ts'o "stored = %u, computed = %lu, %lu\n", 996ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 997ac27a0ecSDave Kleikamp return desc_count; 998ac27a0ecSDave Kleikamp #else 999ac27a0ecSDave Kleikamp desc_count = 0; 1000617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 1001617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1002ac27a0ecSDave Kleikamp if (!gdp) 1003ac27a0ecSDave Kleikamp continue; 1004ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 1005ac27a0ecSDave Kleikamp cond_resched(); 1006ac27a0ecSDave Kleikamp } 1007ac27a0ecSDave Kleikamp return desc_count; 1008ac27a0ecSDave Kleikamp #endif 1009ac27a0ecSDave Kleikamp } 1010ac27a0ecSDave Kleikamp 1011ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1012617ba13bSMingming Cao unsigned long ext4_count_dirs(struct super_block * sb) 1013ac27a0ecSDave Kleikamp { 1014ac27a0ecSDave Kleikamp unsigned long count = 0; 1015fd2d4291SAvantika Mathur ext4_group_t i; 1016ac27a0ecSDave Kleikamp 1017617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 1018617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1019ac27a0ecSDave Kleikamp if (!gdp) 1020ac27a0ecSDave Kleikamp continue; 1021ac27a0ecSDave Kleikamp count += le16_to_cpu(gdp->bg_used_dirs_count); 1022ac27a0ecSDave Kleikamp } 1023ac27a0ecSDave Kleikamp return count; 1024ac27a0ecSDave Kleikamp } 1025ac27a0ecSDave Kleikamp 1026