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 * 100*e29d1cdeSEric 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; 104*e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 105ac27a0ecSDave Kleikamp 106617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 107ac27a0ecSDave Kleikamp if (!desc) 108*e29d1cdeSEric Sandeen return NULL; 109*e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 110*e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 111*e29d1cdeSEric Sandeen if (unlikely(!bh)) { 112*e29d1cdeSEric Sandeen ext4_error(sb, __func__, 113ac27a0ecSDave Kleikamp "Cannot read inode bitmap - " 114bd81d8eeSLaurent Vivier "block_group = %lu, inode_bitmap = %llu", 115*e29d1cdeSEric Sandeen block_group, bitmap_blk); 116*e29d1cdeSEric Sandeen return NULL; 117*e29d1cdeSEric Sandeen } 118*e29d1cdeSEric Sandeen if (bh_uptodate_or_lock(bh)) 119*e29d1cdeSEric Sandeen return bh; 120*e29d1cdeSEric Sandeen 121*e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 122*e29d1cdeSEric Sandeen ext4_init_inode_bitmap(sb, bh, block_group, desc); 123*e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 124*e29d1cdeSEric Sandeen unlock_buffer(bh); 125*e29d1cdeSEric Sandeen return bh; 126*e29d1cdeSEric Sandeen } 127*e29d1cdeSEric Sandeen if (bh_submit_read(bh) < 0) { 128*e29d1cdeSEric Sandeen put_bh(bh); 129*e29d1cdeSEric Sandeen ext4_error(sb, __func__, 130*e29d1cdeSEric Sandeen "Cannot read inode bitmap - " 131*e29d1cdeSEric Sandeen "block_group = %lu, inode_bitmap = %llu", 132*e29d1cdeSEric Sandeen block_group, bitmap_blk); 133*e29d1cdeSEric Sandeen return NULL; 134*e29d1cdeSEric Sandeen } 135ac27a0ecSDave Kleikamp return bh; 136ac27a0ecSDave Kleikamp } 137ac27a0ecSDave Kleikamp 138ac27a0ecSDave Kleikamp /* 139ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 140ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 141ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 142ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 143ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 144ac27a0ecSDave Kleikamp * has been deleted earlier. 145ac27a0ecSDave Kleikamp * 146ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 147ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 148ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 149ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 150ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 151ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 152ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 153ac27a0ecSDave Kleikamp */ 154617ba13bSMingming Cao void ext4_free_inode (handle_t *handle, struct inode * inode) 155ac27a0ecSDave Kleikamp { 156ac27a0ecSDave Kleikamp struct super_block * sb = inode->i_sb; 157ac27a0ecSDave Kleikamp int is_directory; 158ac27a0ecSDave Kleikamp unsigned long ino; 159ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 160ac27a0ecSDave Kleikamp struct buffer_head *bh2; 161fd2d4291SAvantika Mathur ext4_group_t block_group; 162ac27a0ecSDave Kleikamp unsigned long bit; 163617ba13bSMingming Cao struct ext4_group_desc * gdp; 164617ba13bSMingming Cao struct ext4_super_block * es; 165617ba13bSMingming Cao struct ext4_sb_info *sbi; 166ac27a0ecSDave Kleikamp int fatal = 0, err; 167772cb7c8SJose R. Santos ext4_group_t flex_group; 168ac27a0ecSDave Kleikamp 169ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 170617ba13bSMingming Cao printk ("ext4_free_inode: inode has count=%d\n", 171ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 172ac27a0ecSDave Kleikamp return; 173ac27a0ecSDave Kleikamp } 174ac27a0ecSDave Kleikamp if (inode->i_nlink) { 175617ba13bSMingming Cao printk ("ext4_free_inode: inode has nlink=%d\n", 176ac27a0ecSDave Kleikamp inode->i_nlink); 177ac27a0ecSDave Kleikamp return; 178ac27a0ecSDave Kleikamp } 179ac27a0ecSDave Kleikamp if (!sb) { 180617ba13bSMingming Cao printk("ext4_free_inode: inode on nonexistent device\n"); 181ac27a0ecSDave Kleikamp return; 182ac27a0ecSDave Kleikamp } 183617ba13bSMingming Cao sbi = EXT4_SB(sb); 184ac27a0ecSDave Kleikamp 185ac27a0ecSDave Kleikamp ino = inode->i_ino; 186617ba13bSMingming Cao ext4_debug ("freeing inode %lu\n", ino); 187ac27a0ecSDave Kleikamp 188ac27a0ecSDave Kleikamp /* 189ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 190ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 191ac27a0ecSDave Kleikamp */ 192ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 193617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 194ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 195ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 196ac27a0ecSDave Kleikamp 197ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 198ac27a0ecSDave Kleikamp 199ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 200ac27a0ecSDave Kleikamp clear_inode (inode); 201ac27a0ecSDave Kleikamp 202617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 203617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 204617ba13bSMingming Cao ext4_error (sb, "ext4_free_inode", 205ac27a0ecSDave Kleikamp "reserved or nonexistent inode %lu", ino); 206ac27a0ecSDave Kleikamp goto error_return; 207ac27a0ecSDave Kleikamp } 208617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 209617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 210*e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 211ac27a0ecSDave Kleikamp if (!bitmap_bh) 212ac27a0ecSDave Kleikamp goto error_return; 213ac27a0ecSDave Kleikamp 214ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 215617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 216ac27a0ecSDave Kleikamp if (fatal) 217ac27a0ecSDave Kleikamp goto error_return; 218ac27a0ecSDave Kleikamp 219ac27a0ecSDave Kleikamp /* Ok, now we can actually update the inode bitmaps.. */ 220617ba13bSMingming Cao if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), 221ac27a0ecSDave Kleikamp bit, bitmap_bh->b_data)) 222617ba13bSMingming Cao ext4_error (sb, "ext4_free_inode", 223ac27a0ecSDave Kleikamp "bit already cleared for inode %lu", ino); 224ac27a0ecSDave Kleikamp else { 225617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, block_group, &bh2); 226ac27a0ecSDave Kleikamp 227ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 228617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 229ac27a0ecSDave Kleikamp if (fatal) goto error_return; 230ac27a0ecSDave Kleikamp 231ac27a0ecSDave Kleikamp if (gdp) { 232ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, block_group)); 233e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_free_inodes_count, 1); 234ac27a0ecSDave Kleikamp if (is_directory) 235e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_used_dirs_count, -1); 236717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, 237717d50e4SAndreas Dilger block_group, gdp); 238ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, block_group)); 239ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_freeinodes_counter); 240ac27a0ecSDave Kleikamp if (is_directory) 241ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_dirs_counter); 242ac27a0ecSDave Kleikamp 243772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 244772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, block_group); 245772cb7c8SJose R. Santos spin_lock(sb_bgl_lock(sbi, flex_group)); 246772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes++; 247772cb7c8SJose R. Santos spin_unlock(sb_bgl_lock(sbi, flex_group)); 248772cb7c8SJose R. Santos } 249ac27a0ecSDave Kleikamp } 250617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 251617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 252ac27a0ecSDave Kleikamp if (!fatal) fatal = err; 253ac27a0ecSDave Kleikamp } 254617ba13bSMingming Cao BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata"); 255617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bitmap_bh); 256ac27a0ecSDave Kleikamp if (!fatal) 257ac27a0ecSDave Kleikamp fatal = err; 258ac27a0ecSDave Kleikamp sb->s_dirt = 1; 259ac27a0ecSDave Kleikamp error_return: 260ac27a0ecSDave Kleikamp brelse(bitmap_bh); 261617ba13bSMingming Cao ext4_std_error(sb, fatal); 262ac27a0ecSDave Kleikamp } 263ac27a0ecSDave Kleikamp 264ac27a0ecSDave Kleikamp /* 265ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 266ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 267ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 268ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 269ac27a0ecSDave Kleikamp * directories already is chosen. 270ac27a0ecSDave Kleikamp * 271ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory\'s block 272ac27a0ecSDave Kleikamp * group to find a free inode. 273ac27a0ecSDave Kleikamp */ 2742aa9fc4cSAvantika Mathur static int find_group_dir(struct super_block *sb, struct inode *parent, 2752aa9fc4cSAvantika Mathur ext4_group_t *best_group) 276ac27a0ecSDave Kleikamp { 277fd2d4291SAvantika Mathur ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 278ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 279617ba13bSMingming Cao struct ext4_group_desc *desc, *best_desc = NULL; 2802aa9fc4cSAvantika Mathur ext4_group_t group; 2812aa9fc4cSAvantika Mathur int ret = -1; 282ac27a0ecSDave Kleikamp 283617ba13bSMingming Cao freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter); 284ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 285ac27a0ecSDave Kleikamp 286ac27a0ecSDave Kleikamp for (group = 0; group < ngroups; group++) { 287ef2fb679SEric Sandeen desc = ext4_get_group_desc (sb, group, NULL); 288ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 289ac27a0ecSDave Kleikamp continue; 290ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 291ac27a0ecSDave Kleikamp continue; 292ac27a0ecSDave Kleikamp if (!best_desc || 293ac27a0ecSDave Kleikamp (le16_to_cpu(desc->bg_free_blocks_count) > 294ac27a0ecSDave Kleikamp le16_to_cpu(best_desc->bg_free_blocks_count))) { 2952aa9fc4cSAvantika Mathur *best_group = group; 296ac27a0ecSDave Kleikamp best_desc = desc; 2972aa9fc4cSAvantika Mathur ret = 0; 298ac27a0ecSDave Kleikamp } 299ac27a0ecSDave Kleikamp } 3002aa9fc4cSAvantika Mathur return ret; 301ac27a0ecSDave Kleikamp } 302ac27a0ecSDave Kleikamp 303772cb7c8SJose R. Santos #define free_block_ratio 10 304772cb7c8SJose R. Santos 305772cb7c8SJose R. Santos static int find_group_flex(struct super_block *sb, struct inode *parent, 306772cb7c8SJose R. Santos ext4_group_t *best_group) 307772cb7c8SJose R. Santos { 308772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 309772cb7c8SJose R. Santos struct ext4_group_desc *desc; 310772cb7c8SJose R. Santos struct buffer_head *bh; 311772cb7c8SJose R. Santos struct flex_groups *flex_group = sbi->s_flex_groups; 312772cb7c8SJose R. Santos ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 313772cb7c8SJose R. Santos ext4_group_t parent_fbg_group = ext4_flex_group(sbi, parent_group); 314772cb7c8SJose R. Santos ext4_group_t ngroups = sbi->s_groups_count; 315772cb7c8SJose R. Santos int flex_size = ext4_flex_bg_size(sbi); 316772cb7c8SJose R. Santos ext4_group_t best_flex = parent_fbg_group; 317772cb7c8SJose R. Santos int blocks_per_flex = sbi->s_blocks_per_group * flex_size; 318772cb7c8SJose R. Santos int flexbg_free_blocks; 319772cb7c8SJose R. Santos int flex_freeb_ratio; 320772cb7c8SJose R. Santos ext4_group_t n_fbg_groups; 321772cb7c8SJose R. Santos ext4_group_t i; 322772cb7c8SJose R. Santos 323772cb7c8SJose R. Santos n_fbg_groups = (sbi->s_groups_count + flex_size - 1) >> 324772cb7c8SJose R. Santos sbi->s_log_groups_per_flex; 325772cb7c8SJose R. Santos 326772cb7c8SJose R. Santos find_close_to_parent: 327772cb7c8SJose R. Santos flexbg_free_blocks = flex_group[best_flex].free_blocks; 328772cb7c8SJose R. Santos flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex; 329772cb7c8SJose R. Santos if (flex_group[best_flex].free_inodes && 330772cb7c8SJose R. Santos flex_freeb_ratio > free_block_ratio) 331772cb7c8SJose R. Santos goto found_flexbg; 332772cb7c8SJose R. Santos 333772cb7c8SJose R. Santos if (best_flex && best_flex == parent_fbg_group) { 334772cb7c8SJose R. Santos best_flex--; 335772cb7c8SJose R. Santos goto find_close_to_parent; 336772cb7c8SJose R. Santos } 337772cb7c8SJose R. Santos 338772cb7c8SJose R. Santos for (i = 0; i < n_fbg_groups; i++) { 339772cb7c8SJose R. Santos if (i == parent_fbg_group || i == parent_fbg_group - 1) 340772cb7c8SJose R. Santos continue; 341772cb7c8SJose R. Santos 342772cb7c8SJose R. Santos flexbg_free_blocks = flex_group[i].free_blocks; 343772cb7c8SJose R. Santos flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex; 344772cb7c8SJose R. Santos 345772cb7c8SJose R. Santos if (flex_freeb_ratio > free_block_ratio && 346772cb7c8SJose R. Santos flex_group[i].free_inodes) { 347772cb7c8SJose R. Santos best_flex = i; 348772cb7c8SJose R. Santos goto found_flexbg; 349772cb7c8SJose R. Santos } 350772cb7c8SJose R. Santos 351772cb7c8SJose R. Santos if (best_flex < 0 || 352772cb7c8SJose R. Santos (flex_group[i].free_blocks > 353772cb7c8SJose R. Santos flex_group[best_flex].free_blocks && 354772cb7c8SJose R. Santos flex_group[i].free_inodes)) 355772cb7c8SJose R. Santos best_flex = i; 356772cb7c8SJose R. Santos } 357772cb7c8SJose R. Santos 358772cb7c8SJose R. Santos if (!flex_group[best_flex].free_inodes || 359772cb7c8SJose R. Santos !flex_group[best_flex].free_blocks) 360772cb7c8SJose R. Santos return -1; 361772cb7c8SJose R. Santos 362772cb7c8SJose R. Santos found_flexbg: 363772cb7c8SJose R. Santos for (i = best_flex * flex_size; i < ngroups && 364772cb7c8SJose R. Santos i < (best_flex + 1) * flex_size; i++) { 365772cb7c8SJose R. Santos desc = ext4_get_group_desc(sb, i, &bh); 366772cb7c8SJose R. Santos if (le16_to_cpu(desc->bg_free_inodes_count)) { 367772cb7c8SJose R. Santos *best_group = i; 368772cb7c8SJose R. Santos goto out; 369772cb7c8SJose R. Santos } 370772cb7c8SJose R. Santos } 371772cb7c8SJose R. Santos 372772cb7c8SJose R. Santos return -1; 373772cb7c8SJose R. Santos out: 374772cb7c8SJose R. Santos return 0; 375772cb7c8SJose R. Santos } 376772cb7c8SJose R. Santos 377ac27a0ecSDave Kleikamp /* 378ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 379ac27a0ecSDave Kleikamp * 380ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 381ac27a0ecSDave Kleikamp * 382ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 383ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 384ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 385ac27a0ecSDave Kleikamp * 386ac27a0ecSDave Kleikamp * For the rest rules look so: 387ac27a0ecSDave Kleikamp * 388ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 389ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 390ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 391ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 392ac27a0ecSDave Kleikamp * it's already running too large debt (max_debt). 3931cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 394ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 395ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 396ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 397ac27a0ecSDave Kleikamp * 398ac27a0ecSDave Kleikamp * Debt is incremented each time we allocate a directory and decremented 399ac27a0ecSDave Kleikamp * when we allocate an inode, within 0--255. 400ac27a0ecSDave Kleikamp */ 401ac27a0ecSDave Kleikamp 402ac27a0ecSDave Kleikamp #define INODE_COST 64 403ac27a0ecSDave Kleikamp #define BLOCK_COST 256 404ac27a0ecSDave Kleikamp 4052aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 4062aa9fc4cSAvantika Mathur ext4_group_t *group) 407ac27a0ecSDave Kleikamp { 408fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 409617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 410617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 411fd2d4291SAvantika Mathur ext4_group_t ngroups = sbi->s_groups_count; 412617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 413ac27a0ecSDave Kleikamp unsigned int freei, avefreei; 414617ba13bSMingming Cao ext4_fsblk_t freeb, avefreeb; 415617ba13bSMingming Cao ext4_fsblk_t blocks_per_dir; 416ac27a0ecSDave Kleikamp unsigned int ndirs; 417ac27a0ecSDave Kleikamp int max_debt, max_dirs, min_inodes; 418617ba13bSMingming Cao ext4_grpblk_t min_blocks; 4192aa9fc4cSAvantika Mathur ext4_group_t i; 420617ba13bSMingming Cao struct ext4_group_desc *desc; 421ac27a0ecSDave Kleikamp 422ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 423ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 424ac27a0ecSDave Kleikamp freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); 4253a5b2ecdSMingming Cao avefreeb = freeb; 426f4e5bc24SAndrew Morton do_div(avefreeb, ngroups); 427ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 428ac27a0ecSDave Kleikamp 429ac27a0ecSDave Kleikamp if ((parent == sb->s_root->d_inode) || 430617ba13bSMingming Cao (EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) { 431ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4322aa9fc4cSAvantika Mathur ext4_group_t grp; 4332aa9fc4cSAvantika Mathur int ret = -1; 434ac27a0ecSDave Kleikamp 4352aa9fc4cSAvantika Mathur get_random_bytes(&grp, sizeof(grp)); 4362aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 437ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4382aa9fc4cSAvantika Mathur grp = (parent_group + i) % ngroups; 4392aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, grp, NULL); 440ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 441ac27a0ecSDave Kleikamp continue; 442ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) 443ac27a0ecSDave Kleikamp continue; 444ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) 445ac27a0ecSDave Kleikamp continue; 446ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) 447ac27a0ecSDave Kleikamp continue; 4482aa9fc4cSAvantika Mathur *group = grp; 4492aa9fc4cSAvantika Mathur ret = 0; 450ac27a0ecSDave Kleikamp best_ndir = le16_to_cpu(desc->bg_used_dirs_count); 451ac27a0ecSDave Kleikamp } 4522aa9fc4cSAvantika Mathur if (ret == 0) 4532aa9fc4cSAvantika Mathur return ret; 454ac27a0ecSDave Kleikamp goto fallback; 455ac27a0ecSDave Kleikamp } 456ac27a0ecSDave Kleikamp 457bd81d8eeSLaurent Vivier blocks_per_dir = ext4_blocks_count(es) - freeb; 458f4e5bc24SAndrew Morton do_div(blocks_per_dir, ndirs); 459ac27a0ecSDave Kleikamp 460ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 461ac27a0ecSDave Kleikamp min_inodes = avefreei - inodes_per_group / 4; 462617ba13bSMingming Cao min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4; 463ac27a0ecSDave Kleikamp 4643a5b2ecdSMingming Cao max_debt = EXT4_BLOCKS_PER_GROUP(sb); 465f4e5bc24SAndrew Morton max_debt /= max_t(int, blocks_per_dir, BLOCK_COST); 466ac27a0ecSDave Kleikamp if (max_debt * INODE_COST > inodes_per_group) 467ac27a0ecSDave Kleikamp max_debt = inodes_per_group / INODE_COST; 468ac27a0ecSDave Kleikamp if (max_debt > 255) 469ac27a0ecSDave Kleikamp max_debt = 255; 470ac27a0ecSDave Kleikamp if (max_debt == 0) 471ac27a0ecSDave Kleikamp max_debt = 1; 472ac27a0ecSDave Kleikamp 473ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4742aa9fc4cSAvantika Mathur *group = (parent_group + i) % ngroups; 4752aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 476ac27a0ecSDave Kleikamp if (!desc || !desc->bg_free_inodes_count) 477ac27a0ecSDave Kleikamp continue; 478ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) 479ac27a0ecSDave Kleikamp continue; 480ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) 481ac27a0ecSDave Kleikamp continue; 482ac27a0ecSDave Kleikamp if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) 483ac27a0ecSDave Kleikamp continue; 4842aa9fc4cSAvantika Mathur return 0; 485ac27a0ecSDave Kleikamp } 486ac27a0ecSDave Kleikamp 487ac27a0ecSDave Kleikamp fallback: 488ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4892aa9fc4cSAvantika Mathur *group = (parent_group + i) % ngroups; 4902aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 4912aa9fc4cSAvantika Mathur if (desc && desc->bg_free_inodes_count && 4922aa9fc4cSAvantika Mathur le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) 4932aa9fc4cSAvantika Mathur return 0; 494ac27a0ecSDave Kleikamp } 495ac27a0ecSDave Kleikamp 496ac27a0ecSDave Kleikamp if (avefreei) { 497ac27a0ecSDave Kleikamp /* 498ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 499ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 500ac27a0ecSDave Kleikamp */ 501ac27a0ecSDave Kleikamp avefreei = 0; 502ac27a0ecSDave Kleikamp goto fallback; 503ac27a0ecSDave Kleikamp } 504ac27a0ecSDave Kleikamp 505ac27a0ecSDave Kleikamp return -1; 506ac27a0ecSDave Kleikamp } 507ac27a0ecSDave Kleikamp 5082aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 5092aa9fc4cSAvantika Mathur ext4_group_t *group) 510ac27a0ecSDave Kleikamp { 511fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 512fd2d4291SAvantika Mathur ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 513617ba13bSMingming Cao struct ext4_group_desc *desc; 5142aa9fc4cSAvantika Mathur ext4_group_t i; 515ac27a0ecSDave Kleikamp 516ac27a0ecSDave Kleikamp /* 517ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 518ac27a0ecSDave Kleikamp */ 5192aa9fc4cSAvantika Mathur *group = parent_group; 5202aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 521ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 522ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 5232aa9fc4cSAvantika Mathur return 0; 524ac27a0ecSDave Kleikamp 525ac27a0ecSDave Kleikamp /* 526ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 527ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 528ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 529ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 530ac27a0ecSDave Kleikamp * different blockgroup. 531ac27a0ecSDave Kleikamp * 532ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 533ac27a0ecSDave Kleikamp */ 5342aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 535ac27a0ecSDave Kleikamp 536ac27a0ecSDave Kleikamp /* 537ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 538ac27a0ecSDave Kleikamp * blocks. 539ac27a0ecSDave Kleikamp */ 540ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 5412aa9fc4cSAvantika Mathur *group += i; 5422aa9fc4cSAvantika Mathur if (*group >= ngroups) 5432aa9fc4cSAvantika Mathur *group -= ngroups; 5442aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 545ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count) && 546ac27a0ecSDave Kleikamp le16_to_cpu(desc->bg_free_blocks_count)) 5472aa9fc4cSAvantika Mathur return 0; 548ac27a0ecSDave Kleikamp } 549ac27a0ecSDave Kleikamp 550ac27a0ecSDave Kleikamp /* 551ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 552ac27a0ecSDave Kleikamp * has no free blocks. 553ac27a0ecSDave Kleikamp */ 5542aa9fc4cSAvantika Mathur *group = parent_group; 555ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 5562aa9fc4cSAvantika Mathur if (++*group >= ngroups) 5572aa9fc4cSAvantika Mathur *group = 0; 5582aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 559ac27a0ecSDave Kleikamp if (desc && le16_to_cpu(desc->bg_free_inodes_count)) 5602aa9fc4cSAvantika Mathur return 0; 561ac27a0ecSDave Kleikamp } 562ac27a0ecSDave Kleikamp 563ac27a0ecSDave Kleikamp return -1; 564ac27a0ecSDave Kleikamp } 565ac27a0ecSDave Kleikamp 566ac27a0ecSDave Kleikamp /* 567ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 568ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 569ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 570ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 571ac27a0ecSDave Kleikamp * directories already is chosen. 572ac27a0ecSDave Kleikamp * 573ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 574ac27a0ecSDave Kleikamp * group to find a free inode. 575ac27a0ecSDave Kleikamp */ 576617ba13bSMingming Cao struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode) 577ac27a0ecSDave Kleikamp { 578ac27a0ecSDave Kleikamp struct super_block *sb; 579ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 580ac27a0ecSDave Kleikamp struct buffer_head *bh2; 5812aa9fc4cSAvantika Mathur ext4_group_t group = 0; 582ac27a0ecSDave Kleikamp unsigned long ino = 0; 583ac27a0ecSDave Kleikamp struct inode * inode; 584617ba13bSMingming Cao struct ext4_group_desc * gdp = NULL; 585617ba13bSMingming Cao struct ext4_super_block * es; 586617ba13bSMingming Cao struct ext4_inode_info *ei; 587617ba13bSMingming Cao struct ext4_sb_info *sbi; 5882aa9fc4cSAvantika Mathur int ret2, err = 0; 589ac27a0ecSDave Kleikamp struct inode *ret; 5902aa9fc4cSAvantika Mathur ext4_group_t i; 5912aa9fc4cSAvantika Mathur int free = 0; 592772cb7c8SJose R. Santos ext4_group_t flex_group; 593ac27a0ecSDave Kleikamp 594ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 595ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 596ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 597ac27a0ecSDave Kleikamp 598ac27a0ecSDave Kleikamp sb = dir->i_sb; 599ac27a0ecSDave Kleikamp inode = new_inode(sb); 600ac27a0ecSDave Kleikamp if (!inode) 601ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 602617ba13bSMingming Cao ei = EXT4_I(inode); 603ac27a0ecSDave Kleikamp 604617ba13bSMingming Cao sbi = EXT4_SB(sb); 605ac27a0ecSDave Kleikamp es = sbi->s_es; 606772cb7c8SJose R. Santos 607772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 608772cb7c8SJose R. Santos ret2 = find_group_flex(sb, dir, &group); 609772cb7c8SJose R. Santos goto got_group; 610772cb7c8SJose R. Santos } 611772cb7c8SJose R. Santos 612ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 613ac27a0ecSDave Kleikamp if (test_opt (sb, OLDALLOC)) 6142aa9fc4cSAvantika Mathur ret2 = find_group_dir(sb, dir, &group); 615ac27a0ecSDave Kleikamp else 6162aa9fc4cSAvantika Mathur ret2 = find_group_orlov(sb, dir, &group); 617ac27a0ecSDave Kleikamp } else 6182aa9fc4cSAvantika Mathur ret2 = find_group_other(sb, dir, &group); 619ac27a0ecSDave Kleikamp 620772cb7c8SJose R. Santos got_group: 621ac27a0ecSDave Kleikamp err = -ENOSPC; 6222aa9fc4cSAvantika Mathur if (ret2 == -1) 623ac27a0ecSDave Kleikamp goto out; 624ac27a0ecSDave Kleikamp 625ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_groups_count; i++) { 626ac27a0ecSDave Kleikamp err = -EIO; 627ac27a0ecSDave Kleikamp 628617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, group, &bh2); 629ac27a0ecSDave Kleikamp if (!gdp) 630ac27a0ecSDave Kleikamp goto fail; 631ac27a0ecSDave Kleikamp 632ac27a0ecSDave Kleikamp brelse(bitmap_bh); 633*e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, group); 634ac27a0ecSDave Kleikamp if (!bitmap_bh) 635ac27a0ecSDave Kleikamp goto fail; 636ac27a0ecSDave Kleikamp 637ac27a0ecSDave Kleikamp ino = 0; 638ac27a0ecSDave Kleikamp 639ac27a0ecSDave Kleikamp repeat_in_this_group: 640617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 641617ba13bSMingming Cao bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino); 642617ba13bSMingming Cao if (ino < EXT4_INODES_PER_GROUP(sb)) { 643ac27a0ecSDave Kleikamp 644ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 645617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bitmap_bh); 646ac27a0ecSDave Kleikamp if (err) 647ac27a0ecSDave Kleikamp goto fail; 648ac27a0ecSDave Kleikamp 649617ba13bSMingming Cao if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group), 650ac27a0ecSDave Kleikamp ino, bitmap_bh->b_data)) { 651ac27a0ecSDave Kleikamp /* we won it */ 652ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, 653617ba13bSMingming Cao "call ext4_journal_dirty_metadata"); 654617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, 655ac27a0ecSDave Kleikamp bitmap_bh); 656ac27a0ecSDave Kleikamp if (err) 657ac27a0ecSDave Kleikamp goto fail; 658ac27a0ecSDave Kleikamp goto got; 659ac27a0ecSDave Kleikamp } 660ac27a0ecSDave Kleikamp /* we lost it */ 661dab291afSMingming Cao jbd2_journal_release_buffer(handle, bitmap_bh); 662ac27a0ecSDave Kleikamp 663617ba13bSMingming Cao if (++ino < EXT4_INODES_PER_GROUP(sb)) 664ac27a0ecSDave Kleikamp goto repeat_in_this_group; 665ac27a0ecSDave Kleikamp } 666ac27a0ecSDave Kleikamp 667ac27a0ecSDave Kleikamp /* 668ac27a0ecSDave Kleikamp * This case is possible in concurrent environment. It is very 669ac27a0ecSDave Kleikamp * rare. We cannot repeat the find_group_xxx() call because 670ac27a0ecSDave Kleikamp * that will simply return the same blockgroup, because the 671ac27a0ecSDave Kleikamp * group descriptor metadata has not yet been updated. 672ac27a0ecSDave Kleikamp * So we just go onto the next blockgroup. 673ac27a0ecSDave Kleikamp */ 674ac27a0ecSDave Kleikamp if (++group == sbi->s_groups_count) 675ac27a0ecSDave Kleikamp group = 0; 676ac27a0ecSDave Kleikamp } 677ac27a0ecSDave Kleikamp err = -ENOSPC; 678ac27a0ecSDave Kleikamp goto out; 679ac27a0ecSDave Kleikamp 680ac27a0ecSDave Kleikamp got: 681717d50e4SAndreas Dilger ino++; 682717d50e4SAndreas Dilger if ((group == 0 && ino < EXT4_FIRST_INO(sb)) || 683717d50e4SAndreas Dilger ino > EXT4_INODES_PER_GROUP(sb)) { 68446e665e9SHarvey Harrison ext4_error(sb, __func__, 685ac27a0ecSDave Kleikamp "reserved inode or inode > inodes count - " 686fd2d4291SAvantika Mathur "block_group = %lu, inode=%lu", group, 687717d50e4SAndreas Dilger ino + group * EXT4_INODES_PER_GROUP(sb)); 688ac27a0ecSDave Kleikamp err = -EIO; 689ac27a0ecSDave Kleikamp goto fail; 690ac27a0ecSDave Kleikamp } 691ac27a0ecSDave Kleikamp 692ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 693617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh2); 694ac27a0ecSDave Kleikamp if (err) goto fail; 695717d50e4SAndreas Dilger 696717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 697717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 698717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 699574ca174STheodore Ts'o struct buffer_head *block_bh = ext4_read_block_bitmap(sb, group); 700717d50e4SAndreas Dilger 701717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "get block bitmap access"); 702717d50e4SAndreas Dilger err = ext4_journal_get_write_access(handle, block_bh); 703717d50e4SAndreas Dilger if (err) { 704717d50e4SAndreas Dilger brelse(block_bh); 705717d50e4SAndreas Dilger goto fail; 706717d50e4SAndreas Dilger } 707717d50e4SAndreas Dilger 708717d50e4SAndreas Dilger free = 0; 709ac27a0ecSDave Kleikamp spin_lock(sb_bgl_lock(sbi, group)); 710717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 711717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 712717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 713717d50e4SAndreas Dilger free = ext4_free_blocks_after_init(sb, group, gdp); 714717d50e4SAndreas Dilger gdp->bg_free_blocks_count = cpu_to_le16(free); 715717d50e4SAndreas Dilger } 716717d50e4SAndreas Dilger spin_unlock(sb_bgl_lock(sbi, group)); 717717d50e4SAndreas Dilger 718717d50e4SAndreas Dilger /* Don't need to dirty bitmap block if we didn't change it */ 719717d50e4SAndreas Dilger if (free) { 720717d50e4SAndreas Dilger BUFFER_TRACE(block_bh, "dirty block bitmap"); 721717d50e4SAndreas Dilger err = ext4_journal_dirty_metadata(handle, block_bh); 722717d50e4SAndreas Dilger } 723717d50e4SAndreas Dilger 724717d50e4SAndreas Dilger brelse(block_bh); 725717d50e4SAndreas Dilger if (err) 726717d50e4SAndreas Dilger goto fail; 727717d50e4SAndreas Dilger } 728717d50e4SAndreas Dilger 729717d50e4SAndreas Dilger spin_lock(sb_bgl_lock(sbi, group)); 730717d50e4SAndreas Dilger /* If we didn't allocate from within the initialized part of the inode 731717d50e4SAndreas Dilger * table then we need to initialize up to this inode. */ 732717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 733717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 734717d50e4SAndreas Dilger gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 735717d50e4SAndreas Dilger 736717d50e4SAndreas Dilger /* When marking the block group with 737717d50e4SAndreas Dilger * ~EXT4_BG_INODE_UNINIT we don't want to depend 738717d50e4SAndreas Dilger * on the value of bg_itable_unsed even though 739717d50e4SAndreas Dilger * mke2fs could have initialized the same for us. 740717d50e4SAndreas Dilger * Instead we calculated the value below 741717d50e4SAndreas Dilger */ 742717d50e4SAndreas Dilger 743717d50e4SAndreas Dilger free = 0; 744717d50e4SAndreas Dilger } else { 745717d50e4SAndreas Dilger free = EXT4_INODES_PER_GROUP(sb) - 746717d50e4SAndreas Dilger le16_to_cpu(gdp->bg_itable_unused); 747717d50e4SAndreas Dilger } 748717d50e4SAndreas Dilger 749717d50e4SAndreas Dilger /* 750717d50e4SAndreas Dilger * Check the relative inode number against the last used 751717d50e4SAndreas Dilger * relative inode number in this group. if it is greater 752717d50e4SAndreas Dilger * we need to update the bg_itable_unused count 753717d50e4SAndreas Dilger * 754717d50e4SAndreas Dilger */ 755717d50e4SAndreas Dilger if (ino > free) 756717d50e4SAndreas Dilger gdp->bg_itable_unused = 757717d50e4SAndreas Dilger cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino); 758717d50e4SAndreas Dilger } 759717d50e4SAndreas Dilger 760e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_free_inodes_count, -1); 761ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) { 762e8546d06SMarcin Slusarz le16_add_cpu(&gdp->bg_used_dirs_count, 1); 763ac27a0ecSDave Kleikamp } 764717d50e4SAndreas Dilger gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 765ac27a0ecSDave Kleikamp spin_unlock(sb_bgl_lock(sbi, group)); 766617ba13bSMingming Cao BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); 767617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh2); 768ac27a0ecSDave Kleikamp if (err) goto fail; 769ac27a0ecSDave Kleikamp 770ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 771ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 772ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 773ac27a0ecSDave Kleikamp sb->s_dirt = 1; 774ac27a0ecSDave Kleikamp 775772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 776772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 777772cb7c8SJose R. Santos spin_lock(sb_bgl_lock(sbi, flex_group)); 778772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes--; 779772cb7c8SJose R. Santos spin_unlock(sb_bgl_lock(sbi, flex_group)); 780772cb7c8SJose R. Santos } 781772cb7c8SJose R. Santos 782ac27a0ecSDave Kleikamp inode->i_uid = current->fsuid; 783ac27a0ecSDave Kleikamp if (test_opt (sb, GRPID)) 784ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 785ac27a0ecSDave Kleikamp else if (dir->i_mode & S_ISGID) { 786ac27a0ecSDave Kleikamp inode->i_gid = dir->i_gid; 787ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 788ac27a0ecSDave Kleikamp mode |= S_ISGID; 789ac27a0ecSDave Kleikamp } else 790ac27a0ecSDave Kleikamp inode->i_gid = current->fsgid; 791ac27a0ecSDave Kleikamp inode->i_mode = mode; 792ac27a0ecSDave Kleikamp 793717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 794ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 795ac27a0ecSDave Kleikamp inode->i_blocks = 0; 796ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 797ef7f3835SKalpak Shah ext4_current_time(inode); 798ac27a0ecSDave Kleikamp 799ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 800ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 801ac27a0ecSDave Kleikamp ei->i_disksize = 0; 802ac27a0ecSDave Kleikamp 80342bf0383SAneesh Kumar K.V /* 80442bf0383SAneesh Kumar K.V * Don't inherit extent flag from directory. We set extent flag on 80542bf0383SAneesh Kumar K.V * newly created directory and file only if -o extent mount option is 80642bf0383SAneesh Kumar K.V * specified 80742bf0383SAneesh Kumar K.V */ 80842bf0383SAneesh Kumar K.V ei->i_flags = EXT4_I(dir)->i_flags & ~(EXT4_INDEX_FL|EXT4_EXTENTS_FL); 809ac27a0ecSDave Kleikamp if (S_ISLNK(mode)) 810617ba13bSMingming Cao ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL); 811ac27a0ecSDave Kleikamp /* dirsync only applies to directories */ 812ac27a0ecSDave Kleikamp if (!S_ISDIR(mode)) 813617ba13bSMingming Cao ei->i_flags &= ~EXT4_DIRSYNC_FL; 814ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 815ac27a0ecSDave Kleikamp ei->i_dtime = 0; 816ac27a0ecSDave Kleikamp ei->i_block_alloc_info = NULL; 817ac27a0ecSDave Kleikamp ei->i_block_group = group; 818ac27a0ecSDave Kleikamp 819617ba13bSMingming Cao ext4_set_inode_flags(inode); 820ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 821ac27a0ecSDave Kleikamp handle->h_sync = 1; 822ac27a0ecSDave Kleikamp insert_inode_hash(inode); 823ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 824ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 825ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 826ac27a0ecSDave Kleikamp 827617ba13bSMingming Cao ei->i_state = EXT4_STATE_NEW; 828ef7f3835SKalpak Shah 829ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 830ac27a0ecSDave Kleikamp 831ac27a0ecSDave Kleikamp ret = inode; 832ac27a0ecSDave Kleikamp if(DQUOT_ALLOC_INODE(inode)) { 833ac27a0ecSDave Kleikamp err = -EDQUOT; 834ac27a0ecSDave Kleikamp goto fail_drop; 835ac27a0ecSDave Kleikamp } 836ac27a0ecSDave Kleikamp 837617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 838ac27a0ecSDave Kleikamp if (err) 839ac27a0ecSDave Kleikamp goto fail_free_drop; 840ac27a0ecSDave Kleikamp 841617ba13bSMingming Cao err = ext4_init_security(handle,inode, dir); 842ac27a0ecSDave Kleikamp if (err) 843ac27a0ecSDave Kleikamp goto fail_free_drop; 844ac27a0ecSDave Kleikamp 845a86c6181SAlex Tomas if (test_opt(sb, EXTENTS)) { 846e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 847e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 848a86c6181SAlex Tomas EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL; 849a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 850a86c6181SAlex Tomas } 85142bf0383SAneesh Kumar K.V } 852ac27a0ecSDave Kleikamp 8538753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 8548753e88fSAneesh Kumar K.V if (err) { 8558753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 8568753e88fSAneesh Kumar K.V goto fail_free_drop; 8578753e88fSAneesh Kumar K.V } 8588753e88fSAneesh Kumar K.V 859617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 860ac27a0ecSDave Kleikamp goto really_out; 861ac27a0ecSDave Kleikamp fail: 862617ba13bSMingming Cao ext4_std_error(sb, err); 863ac27a0ecSDave Kleikamp out: 864ac27a0ecSDave Kleikamp iput(inode); 865ac27a0ecSDave Kleikamp ret = ERR_PTR(err); 866ac27a0ecSDave Kleikamp really_out: 867ac27a0ecSDave Kleikamp brelse(bitmap_bh); 868ac27a0ecSDave Kleikamp return ret; 869ac27a0ecSDave Kleikamp 870ac27a0ecSDave Kleikamp fail_free_drop: 871ac27a0ecSDave Kleikamp DQUOT_FREE_INODE(inode); 872ac27a0ecSDave Kleikamp 873ac27a0ecSDave Kleikamp fail_drop: 874ac27a0ecSDave Kleikamp DQUOT_DROP(inode); 875ac27a0ecSDave Kleikamp inode->i_flags |= S_NOQUOTA; 876ac27a0ecSDave Kleikamp inode->i_nlink = 0; 877ac27a0ecSDave Kleikamp iput(inode); 878ac27a0ecSDave Kleikamp brelse(bitmap_bh); 879ac27a0ecSDave Kleikamp return ERR_PTR(err); 880ac27a0ecSDave Kleikamp } 881ac27a0ecSDave Kleikamp 882ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 883617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 884ac27a0ecSDave Kleikamp { 885617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 886fd2d4291SAvantika Mathur ext4_group_t block_group; 887ac27a0ecSDave Kleikamp int bit; 8881d1fe1eeSDavid Howells struct buffer_head *bitmap_bh; 889ac27a0ecSDave Kleikamp struct inode *inode = NULL; 8901d1fe1eeSDavid Howells long err = -EIO; 891ac27a0ecSDave Kleikamp 892ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 893ac27a0ecSDave Kleikamp if (ino > max_ino) { 89446e665e9SHarvey Harrison ext4_warning(sb, __func__, 895ac27a0ecSDave Kleikamp "bad orphan ino %lu! e2fsck was run?", ino); 8961d1fe1eeSDavid Howells goto error; 897ac27a0ecSDave Kleikamp } 898ac27a0ecSDave Kleikamp 899617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 900617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 901*e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 902ac27a0ecSDave Kleikamp if (!bitmap_bh) { 90346e665e9SHarvey Harrison ext4_warning(sb, __func__, 904ac27a0ecSDave Kleikamp "inode bitmap error for orphan %lu", ino); 9051d1fe1eeSDavid Howells goto error; 906ac27a0ecSDave Kleikamp } 907ac27a0ecSDave Kleikamp 908ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 909ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 910ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 911ac27a0ecSDave Kleikamp */ 9121d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 9131d1fe1eeSDavid Howells goto bad_orphan; 9141d1fe1eeSDavid Howells 9151d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 9161d1fe1eeSDavid Howells if (IS_ERR(inode)) 9171d1fe1eeSDavid Howells goto iget_failed; 9181d1fe1eeSDavid Howells 91991ef4cafSDuane Griffin /* 92091ef4cafSDuane Griffin * If the orphans has i_nlinks > 0 then it should be able to be 92191ef4cafSDuane Griffin * truncated, otherwise it won't be removed from the orphan list 92291ef4cafSDuane Griffin * during processing and an infinite loop will result. 92391ef4cafSDuane Griffin */ 92491ef4cafSDuane Griffin if (inode->i_nlink && !ext4_can_truncate(inode)) 92591ef4cafSDuane Griffin goto bad_orphan; 92691ef4cafSDuane Griffin 9271d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 9281d1fe1eeSDavid Howells goto bad_orphan; 9291d1fe1eeSDavid Howells brelse(bitmap_bh); 9301d1fe1eeSDavid Howells return inode; 9311d1fe1eeSDavid Howells 9321d1fe1eeSDavid Howells iget_failed: 9331d1fe1eeSDavid Howells err = PTR_ERR(inode); 9341d1fe1eeSDavid Howells inode = NULL; 9351d1fe1eeSDavid Howells bad_orphan: 93646e665e9SHarvey Harrison ext4_warning(sb, __func__, 937ac27a0ecSDave Kleikamp "bad orphan inode %lu! e2fsck was run?", ino); 938617ba13bSMingming Cao printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n", 939ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 940617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 941ac27a0ecSDave Kleikamp printk(KERN_NOTICE "inode=%p\n", inode); 942ac27a0ecSDave Kleikamp if (inode) { 943ac27a0ecSDave Kleikamp printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", 944ac27a0ecSDave Kleikamp is_bad_inode(inode)); 945ac27a0ecSDave Kleikamp printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", 946ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 947ac27a0ecSDave Kleikamp printk(KERN_NOTICE "max_ino=%lu\n", max_ino); 94891ef4cafSDuane Griffin printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); 949ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 9501d1fe1eeSDavid Howells if (inode->i_nlink == 0) 951ac27a0ecSDave Kleikamp inode->i_blocks = 0; 952ac27a0ecSDave Kleikamp iput(inode); 953ac27a0ecSDave Kleikamp } 954ac27a0ecSDave Kleikamp brelse(bitmap_bh); 9551d1fe1eeSDavid Howells error: 9561d1fe1eeSDavid Howells return ERR_PTR(err); 957ac27a0ecSDave Kleikamp } 958ac27a0ecSDave Kleikamp 959617ba13bSMingming Cao unsigned long ext4_count_free_inodes (struct super_block * sb) 960ac27a0ecSDave Kleikamp { 961ac27a0ecSDave Kleikamp unsigned long desc_count; 962617ba13bSMingming Cao struct ext4_group_desc *gdp; 963fd2d4291SAvantika Mathur ext4_group_t i; 964617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 965617ba13bSMingming Cao struct ext4_super_block *es; 966ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 967ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 968ac27a0ecSDave Kleikamp 969617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 970ac27a0ecSDave Kleikamp desc_count = 0; 971ac27a0ecSDave Kleikamp bitmap_count = 0; 972ac27a0ecSDave Kleikamp gdp = NULL; 973617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 974617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, i, NULL); 975ac27a0ecSDave Kleikamp if (!gdp) 976ac27a0ecSDave Kleikamp continue; 977ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 978ac27a0ecSDave Kleikamp brelse(bitmap_bh); 979*e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 980ac27a0ecSDave Kleikamp if (!bitmap_bh) 981ac27a0ecSDave Kleikamp continue; 982ac27a0ecSDave Kleikamp 983617ba13bSMingming Cao x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8); 984c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 985ac27a0ecSDave Kleikamp i, le16_to_cpu(gdp->bg_free_inodes_count), x); 986ac27a0ecSDave Kleikamp bitmap_count += x; 987ac27a0ecSDave Kleikamp } 988ac27a0ecSDave Kleikamp brelse(bitmap_bh); 989617ba13bSMingming Cao printk("ext4_count_free_inodes: stored = %u, computed = %lu, %lu\n", 990ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 991ac27a0ecSDave Kleikamp return desc_count; 992ac27a0ecSDave Kleikamp #else 993ac27a0ecSDave Kleikamp desc_count = 0; 994617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 995617ba13bSMingming Cao gdp = ext4_get_group_desc (sb, i, NULL); 996ac27a0ecSDave Kleikamp if (!gdp) 997ac27a0ecSDave Kleikamp continue; 998ac27a0ecSDave Kleikamp desc_count += le16_to_cpu(gdp->bg_free_inodes_count); 999ac27a0ecSDave Kleikamp cond_resched(); 1000ac27a0ecSDave Kleikamp } 1001ac27a0ecSDave Kleikamp return desc_count; 1002ac27a0ecSDave Kleikamp #endif 1003ac27a0ecSDave Kleikamp } 1004ac27a0ecSDave Kleikamp 1005ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1006617ba13bSMingming Cao unsigned long ext4_count_dirs (struct super_block * sb) 1007ac27a0ecSDave Kleikamp { 1008ac27a0ecSDave Kleikamp unsigned long count = 0; 1009fd2d4291SAvantika Mathur ext4_group_t i; 1010ac27a0ecSDave Kleikamp 1011617ba13bSMingming Cao for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) { 1012617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL); 1013ac27a0ecSDave Kleikamp if (!gdp) 1014ac27a0ecSDave Kleikamp continue; 1015ac27a0ecSDave Kleikamp count += le16_to_cpu(gdp->bg_used_dirs_count); 1016ac27a0ecSDave Kleikamp } 1017ac27a0ecSDave Kleikamp return count; 1018ac27a0ecSDave Kleikamp } 1019ac27a0ecSDave Kleikamp 1020