1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/ialloc.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 5ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 6ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 7ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 8ac27a0ecSDave Kleikamp * 9ac27a0ecSDave Kleikamp * BSD ufs-inspired inode and directory allocation by 10ac27a0ecSDave Kleikamp * Stephen Tweedie (sct@redhat.com), 1993 11ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 12ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 13ac27a0ecSDave Kleikamp */ 14ac27a0ecSDave Kleikamp 15ac27a0ecSDave Kleikamp #include <linux/time.h> 16ac27a0ecSDave Kleikamp #include <linux/fs.h> 17dab291afSMingming Cao #include <linux/jbd2.h> 18ac27a0ecSDave Kleikamp #include <linux/stat.h> 19ac27a0ecSDave Kleikamp #include <linux/string.h> 20ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 21ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 22ac27a0ecSDave Kleikamp #include <linux/random.h> 23ac27a0ecSDave Kleikamp #include <linux/bitops.h> 243a5b2ecdSMingming Cao #include <linux/blkdev.h> 25ac27a0ecSDave Kleikamp #include <asm/byteorder.h> 269bffad1eSTheodore Ts'o 273dcf5451SChristoph Hellwig #include "ext4.h" 283dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 29ac27a0ecSDave Kleikamp #include "xattr.h" 30ac27a0ecSDave Kleikamp #include "acl.h" 31ac27a0ecSDave Kleikamp 329bffad1eSTheodore Ts'o #include <trace/events/ext4.h> 339bffad1eSTheodore Ts'o 34ac27a0ecSDave Kleikamp /* 35ac27a0ecSDave Kleikamp * ialloc.c contains the inodes allocation and deallocation routines 36ac27a0ecSDave Kleikamp */ 37ac27a0ecSDave Kleikamp 38ac27a0ecSDave Kleikamp /* 39ac27a0ecSDave Kleikamp * The free inodes are managed by bitmaps. A file system contains several 40ac27a0ecSDave Kleikamp * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap 41ac27a0ecSDave Kleikamp * block for inodes, N blocks for the inode table and data blocks. 42ac27a0ecSDave Kleikamp * 43ac27a0ecSDave Kleikamp * The file system contains group descriptors which are located after the 44ac27a0ecSDave Kleikamp * super block. Each descriptor contains the number of the bitmap block and 45ac27a0ecSDave Kleikamp * the free blocks count in the block. 46ac27a0ecSDave Kleikamp */ 47ac27a0ecSDave Kleikamp 48717d50e4SAndreas Dilger /* 49717d50e4SAndreas Dilger * To avoid calling the atomic setbit hundreds or thousands of times, we only 50717d50e4SAndreas Dilger * need to use it within a single byte (to ensure we get endianness right). 51717d50e4SAndreas Dilger * We can use memset for the rest of the bitmap as there are no other users. 52717d50e4SAndreas Dilger */ 5361d08673STheodore Ts'o void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) 54717d50e4SAndreas Dilger { 55717d50e4SAndreas Dilger int i; 56717d50e4SAndreas Dilger 57717d50e4SAndreas Dilger if (start_bit >= end_bit) 58717d50e4SAndreas Dilger return; 59717d50e4SAndreas Dilger 60717d50e4SAndreas Dilger ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); 61717d50e4SAndreas Dilger for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) 62717d50e4SAndreas Dilger ext4_set_bit(i, bitmap); 63717d50e4SAndreas Dilger if (i < end_bit) 64717d50e4SAndreas Dilger memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); 65717d50e4SAndreas Dilger } 66717d50e4SAndreas Dilger 67717d50e4SAndreas Dilger /* Initializes an uninitialized inode bitmap */ 681f109d5aSTheodore Ts'o static unsigned ext4_init_inode_bitmap(struct super_block *sb, 691f109d5aSTheodore Ts'o struct buffer_head *bh, 70fd2d4291SAvantika Mathur ext4_group_t block_group, 71717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 72717d50e4SAndreas Dilger { 73717d50e4SAndreas Dilger struct ext4_sb_info *sbi = EXT4_SB(sb); 74717d50e4SAndreas Dilger 75717d50e4SAndreas Dilger J_ASSERT_BH(bh, buffer_locked(bh)); 76717d50e4SAndreas Dilger 77717d50e4SAndreas Dilger /* If checksum is bad mark all blocks and inodes use to prevent 78717d50e4SAndreas Dilger * allocation, essentially implementing a per-group read-only flag. */ 79717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { 8012062dddSEric Sandeen ext4_error(sb, "Checksum bad for group %u", block_group); 81021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 0); 82560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, 0); 83560671a0SAneesh Kumar K.V ext4_itable_unused_set(sb, gdp, 0); 84717d50e4SAndreas Dilger memset(bh->b_data, 0xff, sb->s_blocksize); 8541a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, 8641a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 87717d50e4SAndreas Dilger return 0; 88717d50e4SAndreas Dilger } 89717d50e4SAndreas Dilger 90717d50e4SAndreas Dilger memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 9161d08673STheodore Ts'o ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, 92717d50e4SAndreas Dilger bh->b_data); 9341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, 9441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 9541a246d1SDarrick J. Wong gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp); 96717d50e4SAndreas Dilger 97717d50e4SAndreas Dilger return EXT4_INODES_PER_GROUP(sb); 98717d50e4SAndreas Dilger } 99ac27a0ecSDave Kleikamp 100813e5727STheodore Ts'o void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) 101813e5727STheodore Ts'o { 102813e5727STheodore Ts'o if (uptodate) { 103813e5727STheodore Ts'o set_buffer_uptodate(bh); 104813e5727STheodore Ts'o set_bitmap_uptodate(bh); 105813e5727STheodore Ts'o } 106813e5727STheodore Ts'o unlock_buffer(bh); 107813e5727STheodore Ts'o put_bh(bh); 108813e5727STheodore Ts'o } 109813e5727STheodore Ts'o 110ac27a0ecSDave Kleikamp /* 111ac27a0ecSDave Kleikamp * Read the inode allocation bitmap for a given block_group, reading 112ac27a0ecSDave Kleikamp * into the specified slot in the superblock's bitmap cache. 113ac27a0ecSDave Kleikamp * 114ac27a0ecSDave Kleikamp * Return buffer_head of bitmap on success or NULL. 115ac27a0ecSDave Kleikamp */ 116ac27a0ecSDave Kleikamp static struct buffer_head * 117e29d1cdeSEric Sandeen ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) 118ac27a0ecSDave Kleikamp { 119617ba13bSMingming Cao struct ext4_group_desc *desc; 120ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 121e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 122ac27a0ecSDave Kleikamp 123617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 124ac27a0ecSDave Kleikamp if (!desc) 125e29d1cdeSEric Sandeen return NULL; 126bfff6873SLukas Czerner 127e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 128e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 129e29d1cdeSEric Sandeen if (unlikely(!bh)) { 13012062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 131a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 132e29d1cdeSEric Sandeen block_group, bitmap_blk); 133e29d1cdeSEric Sandeen return NULL; 134e29d1cdeSEric Sandeen } 1352ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) 13641a246d1SDarrick J. Wong goto verify; 137e29d1cdeSEric Sandeen 138c806e68fSFrederic Bohe lock_buffer(bh); 1392ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) { 1402ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 14141a246d1SDarrick J. Wong goto verify; 1422ccb5fb9SAneesh Kumar K.V } 143bfff6873SLukas Czerner 144955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 145e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 146e29d1cdeSEric Sandeen ext4_init_inode_bitmap(sb, bh, block_group, desc); 1472ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 148e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 14941a246d1SDarrick J. Wong set_buffer_verified(bh); 150955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 1513300bedaSAneesh Kumar K.V unlock_buffer(bh); 152e29d1cdeSEric Sandeen return bh; 153e29d1cdeSEric Sandeen } 154955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 155bfff6873SLukas Czerner 1562ccb5fb9SAneesh Kumar K.V if (buffer_uptodate(bh)) { 1572ccb5fb9SAneesh Kumar K.V /* 1582ccb5fb9SAneesh Kumar K.V * if not uninit if bh is uptodate, 1592ccb5fb9SAneesh Kumar K.V * bitmap is also uptodate 1602ccb5fb9SAneesh Kumar K.V */ 1612ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 1622ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 16341a246d1SDarrick J. Wong goto verify; 1642ccb5fb9SAneesh Kumar K.V } 1652ccb5fb9SAneesh Kumar K.V /* 166813e5727STheodore Ts'o * submit the buffer_head for reading 1672ccb5fb9SAneesh Kumar K.V */ 1680562e0baSJiaying Zhang trace_ext4_load_inode_bitmap(sb, block_group); 169813e5727STheodore Ts'o bh->b_end_io = ext4_end_bitmap_read; 170813e5727STheodore Ts'o get_bh(bh); 171813e5727STheodore Ts'o submit_bh(READ, bh); 172813e5727STheodore Ts'o wait_on_buffer(bh); 173813e5727STheodore Ts'o if (!buffer_uptodate(bh)) { 174e29d1cdeSEric Sandeen put_bh(bh); 17512062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 176a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 177e29d1cdeSEric Sandeen block_group, bitmap_blk); 178e29d1cdeSEric Sandeen return NULL; 179e29d1cdeSEric Sandeen } 18041a246d1SDarrick J. Wong 18141a246d1SDarrick J. Wong verify: 18241a246d1SDarrick J. Wong ext4_lock_group(sb, block_group); 18341a246d1SDarrick J. Wong if (!buffer_verified(bh) && 18441a246d1SDarrick J. Wong !ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, 18541a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8)) { 18641a246d1SDarrick J. Wong ext4_unlock_group(sb, block_group); 18741a246d1SDarrick J. Wong put_bh(bh); 18841a246d1SDarrick J. Wong ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " 18941a246d1SDarrick J. Wong "inode_bitmap = %llu", block_group, bitmap_blk); 19041a246d1SDarrick J. Wong return NULL; 19141a246d1SDarrick J. Wong } 19241a246d1SDarrick J. Wong ext4_unlock_group(sb, block_group); 19341a246d1SDarrick J. Wong set_buffer_verified(bh); 194ac27a0ecSDave Kleikamp return bh; 195ac27a0ecSDave Kleikamp } 196ac27a0ecSDave Kleikamp 197ac27a0ecSDave Kleikamp /* 198ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 199ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 200ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 201ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 202ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 203ac27a0ecSDave Kleikamp * has been deleted earlier. 204ac27a0ecSDave Kleikamp * 205ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 206ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 207ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 208ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 209ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 210ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 211ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 212ac27a0ecSDave Kleikamp */ 213617ba13bSMingming Cao void ext4_free_inode(handle_t *handle, struct inode *inode) 214ac27a0ecSDave Kleikamp { 215ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 216ac27a0ecSDave Kleikamp int is_directory; 217ac27a0ecSDave Kleikamp unsigned long ino; 218ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 219ac27a0ecSDave Kleikamp struct buffer_head *bh2; 220fd2d4291SAvantika Mathur ext4_group_t block_group; 221ac27a0ecSDave Kleikamp unsigned long bit; 222617ba13bSMingming Cao struct ext4_group_desc *gdp; 223617ba13bSMingming Cao struct ext4_super_block *es; 224617ba13bSMingming Cao struct ext4_sb_info *sbi; 2257ce9d5d1SEric Sandeen int fatal = 0, err, count, cleared; 226ac27a0ecSDave Kleikamp 22792b97816STheodore Ts'o if (!sb) { 22892b97816STheodore Ts'o printk(KERN_ERR "EXT4-fs: %s:%d: inode on " 22992b97816STheodore Ts'o "nonexistent device\n", __func__, __LINE__); 23092b97816STheodore Ts'o return; 23192b97816STheodore Ts'o } 232ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 23392b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", 23492b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, 235ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 236ac27a0ecSDave Kleikamp return; 237ac27a0ecSDave Kleikamp } 238ac27a0ecSDave Kleikamp if (inode->i_nlink) { 23992b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", 24092b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, inode->i_nlink); 241ac27a0ecSDave Kleikamp return; 242ac27a0ecSDave Kleikamp } 243617ba13bSMingming Cao sbi = EXT4_SB(sb); 244ac27a0ecSDave Kleikamp 245ac27a0ecSDave Kleikamp ino = inode->i_ino; 246617ba13bSMingming Cao ext4_debug("freeing inode %lu\n", ino); 2479bffad1eSTheodore Ts'o trace_ext4_free_inode(inode); 248ac27a0ecSDave Kleikamp 249ac27a0ecSDave Kleikamp /* 250ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 251ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 252ac27a0ecSDave Kleikamp */ 253871a2931SChristoph Hellwig dquot_initialize(inode); 254617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 25563936ddaSChristoph Hellwig dquot_free_inode(inode); 2569f754758SChristoph Hellwig dquot_drop(inode); 257ac27a0ecSDave Kleikamp 258ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 259ac27a0ecSDave Kleikamp 260ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 2610930fcc1SAl Viro ext4_clear_inode(inode); 262ac27a0ecSDave Kleikamp 263617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 264617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 26512062dddSEric Sandeen ext4_error(sb, "reserved or nonexistent inode %lu", ino); 266ac27a0ecSDave Kleikamp goto error_return; 267ac27a0ecSDave Kleikamp } 268617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 269617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 270e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 271ac27a0ecSDave Kleikamp if (!bitmap_bh) 272ac27a0ecSDave Kleikamp goto error_return; 273ac27a0ecSDave Kleikamp 274ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 275617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 276ac27a0ecSDave Kleikamp if (fatal) 277ac27a0ecSDave Kleikamp goto error_return; 278ac27a0ecSDave Kleikamp 279d17413c0SDmitry Monakhov fatal = -ESRCH; 280617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, block_group, &bh2); 281d17413c0SDmitry Monakhov if (gdp) { 282ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 283617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 284d17413c0SDmitry Monakhov } 285955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 286597d508cSAkinobu Mita cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); 287d17413c0SDmitry Monakhov if (fatal || !cleared) { 288d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 289d17413c0SDmitry Monakhov goto out; 290d17413c0SDmitry Monakhov } 291d17413c0SDmitry Monakhov 292560671a0SAneesh Kumar K.V count = ext4_free_inodes_count(sb, gdp) + 1; 293560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, count); 294560671a0SAneesh Kumar K.V if (is_directory) { 295560671a0SAneesh Kumar K.V count = ext4_used_dirs_count(sb, gdp) - 1; 296560671a0SAneesh Kumar K.V ext4_used_dirs_set(sb, gdp, count); 297d17413c0SDmitry Monakhov percpu_counter_dec(&sbi->s_dirs_counter); 298d17413c0SDmitry Monakhov } 29941a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, 30041a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 301d17413c0SDmitry Monakhov gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp); 302d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 3037d39db14STheodore Ts'o 304d17413c0SDmitry Monakhov percpu_counter_inc(&sbi->s_freeinodes_counter); 305d17413c0SDmitry Monakhov if (sbi->s_log_groups_per_flex) { 306d17413c0SDmitry Monakhov ext4_group_t f = ext4_flex_group(sbi, block_group); 307d17413c0SDmitry Monakhov 308d17413c0SDmitry Monakhov atomic_inc(&sbi->s_flex_groups[f].free_inodes); 309d17413c0SDmitry Monakhov if (is_directory) 310c4caae25SEric Sandeen atomic_dec(&sbi->s_flex_groups[f].used_dirs); 3117d39db14STheodore Ts'o } 3120390131bSFrank Mayhar BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); 313d17413c0SDmitry Monakhov fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); 314d17413c0SDmitry Monakhov out: 315d17413c0SDmitry Monakhov if (cleared) { 3160390131bSFrank Mayhar BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); 3170390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 318ac27a0ecSDave Kleikamp if (!fatal) 319ac27a0ecSDave Kleikamp fatal = err; 320a0375156STheodore Ts'o ext4_mark_super_dirty(sb); 321d17413c0SDmitry Monakhov } else 322d17413c0SDmitry Monakhov ext4_error(sb, "bit already cleared for inode %lu", ino); 323d17413c0SDmitry Monakhov 324ac27a0ecSDave Kleikamp error_return: 325ac27a0ecSDave Kleikamp brelse(bitmap_bh); 326617ba13bSMingming Cao ext4_std_error(sb, fatal); 327ac27a0ecSDave Kleikamp } 328ac27a0ecSDave Kleikamp 329a4912123STheodore Ts'o struct orlov_stats { 330a4912123STheodore Ts'o __u32 free_inodes; 33124aaa8efSTheodore Ts'o __u32 free_clusters; 332a4912123STheodore Ts'o __u32 used_dirs; 333a4912123STheodore Ts'o }; 334a4912123STheodore Ts'o 335a4912123STheodore Ts'o /* 336a4912123STheodore Ts'o * Helper function for Orlov's allocator; returns critical information 337a4912123STheodore Ts'o * for a particular block group or flex_bg. If flex_size is 1, then g 338a4912123STheodore Ts'o * is a block group number; otherwise it is flex_bg number. 339a4912123STheodore Ts'o */ 3401f109d5aSTheodore Ts'o static void get_orlov_stats(struct super_block *sb, ext4_group_t g, 341a4912123STheodore Ts'o int flex_size, struct orlov_stats *stats) 342a4912123STheodore Ts'o { 343a4912123STheodore Ts'o struct ext4_group_desc *desc; 3447d39db14STheodore Ts'o struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; 345a4912123STheodore Ts'o 3467d39db14STheodore Ts'o if (flex_size > 1) { 3477d39db14STheodore Ts'o stats->free_inodes = atomic_read(&flex_group[g].free_inodes); 34824aaa8efSTheodore Ts'o stats->free_clusters = atomic_read(&flex_group[g].free_clusters); 3497d39db14STheodore Ts'o stats->used_dirs = atomic_read(&flex_group[g].used_dirs); 3507d39db14STheodore Ts'o return; 3517d39db14STheodore Ts'o } 3527d39db14STheodore Ts'o 3537d39db14STheodore Ts'o desc = ext4_get_group_desc(sb, g, NULL); 3547d39db14STheodore Ts'o if (desc) { 3557d39db14STheodore Ts'o stats->free_inodes = ext4_free_inodes_count(sb, desc); 356021b65bbSTheodore Ts'o stats->free_clusters = ext4_free_group_clusters(sb, desc); 3577d39db14STheodore Ts'o stats->used_dirs = ext4_used_dirs_count(sb, desc); 3587d39db14STheodore Ts'o } else { 359a4912123STheodore Ts'o stats->free_inodes = 0; 36024aaa8efSTheodore Ts'o stats->free_clusters = 0; 361a4912123STheodore Ts'o stats->used_dirs = 0; 362a4912123STheodore Ts'o } 363a4912123STheodore Ts'o } 364a4912123STheodore Ts'o 365ac27a0ecSDave Kleikamp /* 366ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 367ac27a0ecSDave Kleikamp * 368ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 369ac27a0ecSDave Kleikamp * 370ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 371ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 372ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 373ac27a0ecSDave Kleikamp * 374ac27a0ecSDave Kleikamp * For the rest rules look so: 375ac27a0ecSDave Kleikamp * 376ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 377ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 378ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 379ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 3801cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 381ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 382ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 383ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 384ac27a0ecSDave Kleikamp */ 385ac27a0ecSDave Kleikamp 3862aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 387dcca3fecSAl Viro ext4_group_t *group, umode_t mode, 388f157a4aaSTheodore Ts'o const struct qstr *qstr) 389ac27a0ecSDave Kleikamp { 390fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 391617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3928df9675fSTheodore Ts'o ext4_group_t real_ngroups = ext4_get_groups_count(sb); 393617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 39414c83c9fSTheodore Ts'o unsigned int freei, avefreei, grp_free; 39524aaa8efSTheodore Ts'o ext4_fsblk_t freeb, avefreec; 396ac27a0ecSDave Kleikamp unsigned int ndirs; 397a4912123STheodore Ts'o int max_dirs, min_inodes; 39824aaa8efSTheodore Ts'o ext4_grpblk_t min_clusters; 3998df9675fSTheodore Ts'o ext4_group_t i, grp, g, ngroups; 400617ba13bSMingming Cao struct ext4_group_desc *desc; 401a4912123STheodore Ts'o struct orlov_stats stats; 402a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(sbi); 403f157a4aaSTheodore Ts'o struct dx_hash_info hinfo; 404a4912123STheodore Ts'o 4058df9675fSTheodore Ts'o ngroups = real_ngroups; 406a4912123STheodore Ts'o if (flex_size > 1) { 4078df9675fSTheodore Ts'o ngroups = (real_ngroups + flex_size - 1) >> 408a4912123STheodore Ts'o sbi->s_log_groups_per_flex; 409a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 410a4912123STheodore Ts'o } 411ac27a0ecSDave Kleikamp 412ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 413ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 41457042651STheodore Ts'o freeb = EXT4_C2B(sbi, 41557042651STheodore Ts'o percpu_counter_read_positive(&sbi->s_freeclusters_counter)); 41624aaa8efSTheodore Ts'o avefreec = freeb; 41724aaa8efSTheodore Ts'o do_div(avefreec, ngroups); 418ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 419ac27a0ecSDave Kleikamp 420a4912123STheodore Ts'o if (S_ISDIR(mode) && 421a4912123STheodore Ts'o ((parent == sb->s_root->d_inode) || 42212e9b892SDmitry Monakhov (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { 423ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4242aa9fc4cSAvantika Mathur int ret = -1; 425ac27a0ecSDave Kleikamp 426f157a4aaSTheodore Ts'o if (qstr) { 427f157a4aaSTheodore Ts'o hinfo.hash_version = DX_HASH_HALF_MD4; 428f157a4aaSTheodore Ts'o hinfo.seed = sbi->s_hash_seed; 429f157a4aaSTheodore Ts'o ext4fs_dirhash(qstr->name, qstr->len, &hinfo); 430f157a4aaSTheodore Ts'o grp = hinfo.hash; 431f157a4aaSTheodore Ts'o } else 4322aa9fc4cSAvantika Mathur get_random_bytes(&grp, sizeof(grp)); 4332aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 434ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 435a4912123STheodore Ts'o g = (parent_group + i) % ngroups; 436a4912123STheodore Ts'o get_orlov_stats(sb, g, flex_size, &stats); 437a4912123STheodore Ts'o if (!stats.free_inodes) 438ac27a0ecSDave Kleikamp continue; 439a4912123STheodore Ts'o if (stats.used_dirs >= best_ndir) 440ac27a0ecSDave Kleikamp continue; 441a4912123STheodore Ts'o if (stats.free_inodes < avefreei) 442ac27a0ecSDave Kleikamp continue; 44324aaa8efSTheodore Ts'o if (stats.free_clusters < avefreec) 444ac27a0ecSDave Kleikamp continue; 445a4912123STheodore Ts'o grp = g; 4462aa9fc4cSAvantika Mathur ret = 0; 447a4912123STheodore Ts'o best_ndir = stats.used_dirs; 448ac27a0ecSDave Kleikamp } 449a4912123STheodore Ts'o if (ret) 450a4912123STheodore Ts'o goto fallback; 451a4912123STheodore Ts'o found_flex_bg: 452a4912123STheodore Ts'o if (flex_size == 1) { 453a4912123STheodore Ts'o *group = grp; 454a4912123STheodore Ts'o return 0; 455a4912123STheodore Ts'o } 456a4912123STheodore Ts'o 457a4912123STheodore Ts'o /* 458a4912123STheodore Ts'o * We pack inodes at the beginning of the flexgroup's 459a4912123STheodore Ts'o * inode tables. Block allocation decisions will do 460a4912123STheodore Ts'o * something similar, although regular files will 461a4912123STheodore Ts'o * start at 2nd block group of the flexgroup. See 462a4912123STheodore Ts'o * ext4_ext_find_goal() and ext4_find_near(). 463a4912123STheodore Ts'o */ 464a4912123STheodore Ts'o grp *= flex_size; 465a4912123STheodore Ts'o for (i = 0; i < flex_size; i++) { 4668df9675fSTheodore Ts'o if (grp+i >= real_ngroups) 467a4912123STheodore Ts'o break; 468a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp+i, NULL); 469a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 470a4912123STheodore Ts'o *group = grp+i; 471a4912123STheodore Ts'o return 0; 472a4912123STheodore Ts'o } 473a4912123STheodore Ts'o } 474ac27a0ecSDave Kleikamp goto fallback; 475ac27a0ecSDave Kleikamp } 476ac27a0ecSDave Kleikamp 477ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 478a4912123STheodore Ts'o min_inodes = avefreei - inodes_per_group*flex_size / 4; 479a4912123STheodore Ts'o if (min_inodes < 1) 480a4912123STheodore Ts'o min_inodes = 1; 48124aaa8efSTheodore Ts'o min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; 482ac27a0ecSDave Kleikamp 483a4912123STheodore Ts'o /* 484a4912123STheodore Ts'o * Start looking in the flex group where we last allocated an 485a4912123STheodore Ts'o * inode for this parent directory 486a4912123STheodore Ts'o */ 487a4912123STheodore Ts'o if (EXT4_I(parent)->i_last_alloc_group != ~0) { 488a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 489a4912123STheodore Ts'o if (flex_size > 1) 490a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 491a4912123STheodore Ts'o } 492ac27a0ecSDave Kleikamp 493ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 494a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 495a4912123STheodore Ts'o get_orlov_stats(sb, grp, flex_size, &stats); 496a4912123STheodore Ts'o if (stats.used_dirs >= max_dirs) 497ac27a0ecSDave Kleikamp continue; 498a4912123STheodore Ts'o if (stats.free_inodes < min_inodes) 499ac27a0ecSDave Kleikamp continue; 50024aaa8efSTheodore Ts'o if (stats.free_clusters < min_clusters) 501ac27a0ecSDave Kleikamp continue; 502a4912123STheodore Ts'o goto found_flex_bg; 503ac27a0ecSDave Kleikamp } 504ac27a0ecSDave Kleikamp 505ac27a0ecSDave Kleikamp fallback: 5068df9675fSTheodore Ts'o ngroups = real_ngroups; 507a4912123STheodore Ts'o avefreei = freei / ngroups; 508b5451f7bSTheodore Ts'o fallback_retry: 509a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_block_group; 510ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 511a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 512a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp, NULL); 51314c83c9fSTheodore Ts'o grp_free = ext4_free_inodes_count(sb, desc); 51414c83c9fSTheodore Ts'o if (desc && grp_free && grp_free >= avefreei) { 515a4912123STheodore Ts'o *group = grp; 5162aa9fc4cSAvantika Mathur return 0; 517ac27a0ecSDave Kleikamp } 518a4912123STheodore Ts'o } 519ac27a0ecSDave Kleikamp 520ac27a0ecSDave Kleikamp if (avefreei) { 521ac27a0ecSDave Kleikamp /* 522ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 523ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 524ac27a0ecSDave Kleikamp */ 525ac27a0ecSDave Kleikamp avefreei = 0; 526b5451f7bSTheodore Ts'o goto fallback_retry; 527ac27a0ecSDave Kleikamp } 528ac27a0ecSDave Kleikamp 529ac27a0ecSDave Kleikamp return -1; 530ac27a0ecSDave Kleikamp } 531ac27a0ecSDave Kleikamp 5322aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 533dcca3fecSAl Viro ext4_group_t *group, umode_t mode) 534ac27a0ecSDave Kleikamp { 535fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 5368df9675fSTheodore Ts'o ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); 537617ba13bSMingming Cao struct ext4_group_desc *desc; 538a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); 539a4912123STheodore Ts'o 540a4912123STheodore Ts'o /* 541a4912123STheodore Ts'o * Try to place the inode is the same flex group as its 542a4912123STheodore Ts'o * parent. If we can't find space, use the Orlov algorithm to 543a4912123STheodore Ts'o * find another flex group, and store that information in the 544a4912123STheodore Ts'o * parent directory's inode information so that use that flex 545a4912123STheodore Ts'o * group for future allocations. 546a4912123STheodore Ts'o */ 547a4912123STheodore Ts'o if (flex_size > 1) { 548a4912123STheodore Ts'o int retry = 0; 549a4912123STheodore Ts'o 550a4912123STheodore Ts'o try_again: 551a4912123STheodore Ts'o parent_group &= ~(flex_size-1); 552a4912123STheodore Ts'o last = parent_group + flex_size; 553a4912123STheodore Ts'o if (last > ngroups) 554a4912123STheodore Ts'o last = ngroups; 555a4912123STheodore Ts'o for (i = parent_group; i < last; i++) { 556a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, i, NULL); 557a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 558a4912123STheodore Ts'o *group = i; 559a4912123STheodore Ts'o return 0; 560a4912123STheodore Ts'o } 561a4912123STheodore Ts'o } 562a4912123STheodore Ts'o if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { 563a4912123STheodore Ts'o retry = 1; 564a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 565a4912123STheodore Ts'o goto try_again; 566a4912123STheodore Ts'o } 567a4912123STheodore Ts'o /* 568a4912123STheodore Ts'o * If this didn't work, use the Orlov search algorithm 569a4912123STheodore Ts'o * to find a new flex group; we pass in the mode to 570a4912123STheodore Ts'o * avoid the topdir algorithms. 571a4912123STheodore Ts'o */ 572a4912123STheodore Ts'o *group = parent_group + flex_size; 573a4912123STheodore Ts'o if (*group > ngroups) 574a4912123STheodore Ts'o *group = 0; 5757dc57615SPeter Huewe return find_group_orlov(sb, parent, group, mode, NULL); 576a4912123STheodore Ts'o } 577ac27a0ecSDave Kleikamp 578ac27a0ecSDave Kleikamp /* 579ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 580ac27a0ecSDave Kleikamp */ 5812aa9fc4cSAvantika Mathur *group = parent_group; 5822aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 583560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 584021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 5852aa9fc4cSAvantika Mathur return 0; 586ac27a0ecSDave Kleikamp 587ac27a0ecSDave Kleikamp /* 588ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 589ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 590ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 591ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 592ac27a0ecSDave Kleikamp * different blockgroup. 593ac27a0ecSDave Kleikamp * 594ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 595ac27a0ecSDave Kleikamp */ 5962aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 597ac27a0ecSDave Kleikamp 598ac27a0ecSDave Kleikamp /* 599ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 600ac27a0ecSDave Kleikamp * blocks. 601ac27a0ecSDave Kleikamp */ 602ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 6032aa9fc4cSAvantika Mathur *group += i; 6042aa9fc4cSAvantika Mathur if (*group >= ngroups) 6052aa9fc4cSAvantika Mathur *group -= ngroups; 6062aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 607560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 608021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 6092aa9fc4cSAvantika Mathur return 0; 610ac27a0ecSDave Kleikamp } 611ac27a0ecSDave Kleikamp 612ac27a0ecSDave Kleikamp /* 613ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 614ac27a0ecSDave Kleikamp * has no free blocks. 615ac27a0ecSDave Kleikamp */ 6162aa9fc4cSAvantika Mathur *group = parent_group; 617ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 6182aa9fc4cSAvantika Mathur if (++*group >= ngroups) 6192aa9fc4cSAvantika Mathur *group = 0; 6202aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 621560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc)) 6222aa9fc4cSAvantika Mathur return 0; 623ac27a0ecSDave Kleikamp } 624ac27a0ecSDave Kleikamp 625ac27a0ecSDave Kleikamp return -1; 626ac27a0ecSDave Kleikamp } 627ac27a0ecSDave Kleikamp 628ac27a0ecSDave Kleikamp /* 629ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 630ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 631ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 632ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 633ac27a0ecSDave Kleikamp * directories already is chosen. 634ac27a0ecSDave Kleikamp * 635ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 636ac27a0ecSDave Kleikamp * group to find a free inode. 637ac27a0ecSDave Kleikamp */ 638dcca3fecSAl Viro struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, umode_t mode, 6395cb81dabSDmitry Monakhov const struct qstr *qstr, __u32 goal, uid_t *owner) 640ac27a0ecSDave Kleikamp { 641ac27a0ecSDave Kleikamp struct super_block *sb; 6423300bedaSAneesh Kumar K.V struct buffer_head *inode_bitmap_bh = NULL; 6433300bedaSAneesh Kumar K.V struct buffer_head *group_desc_bh; 6448df9675fSTheodore Ts'o ext4_group_t ngroups, group = 0; 645ac27a0ecSDave Kleikamp unsigned long ino = 0; 646ac27a0ecSDave Kleikamp struct inode *inode; 647617ba13bSMingming Cao struct ext4_group_desc *gdp = NULL; 648617ba13bSMingming Cao struct ext4_inode_info *ei; 649617ba13bSMingming Cao struct ext4_sb_info *sbi; 65039341867SAneesh Kumar K.V int ret2, err = 0; 651ac27a0ecSDave Kleikamp struct inode *ret; 6522aa9fc4cSAvantika Mathur ext4_group_t i; 653772cb7c8SJose R. Santos ext4_group_t flex_group; 654ac27a0ecSDave Kleikamp 655ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 656ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 657ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 658ac27a0ecSDave Kleikamp 659ac27a0ecSDave Kleikamp sb = dir->i_sb; 6608df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 6619bffad1eSTheodore Ts'o trace_ext4_request_inode(dir, mode); 662ac27a0ecSDave Kleikamp inode = new_inode(sb); 663ac27a0ecSDave Kleikamp if (!inode) 664ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 665617ba13bSMingming Cao ei = EXT4_I(inode); 666617ba13bSMingming Cao sbi = EXT4_SB(sb); 667772cb7c8SJose R. Santos 66811013911SAndreas Dilger if (!goal) 66911013911SAndreas Dilger goal = sbi->s_inode_goal; 67011013911SAndreas Dilger 671e6462869SJohann Lombardi if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { 67211013911SAndreas Dilger group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); 67311013911SAndreas Dilger ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); 67411013911SAndreas Dilger ret2 = 0; 67511013911SAndreas Dilger goto got_group; 67611013911SAndreas Dilger } 67711013911SAndreas Dilger 6784113c4caSLukas Czerner if (S_ISDIR(mode)) 679f157a4aaSTheodore Ts'o ret2 = find_group_orlov(sb, dir, &group, mode, qstr); 6804113c4caSLukas Czerner else 681a4912123STheodore Ts'o ret2 = find_group_other(sb, dir, &group, mode); 682ac27a0ecSDave Kleikamp 683772cb7c8SJose R. Santos got_group: 684a4912123STheodore Ts'o EXT4_I(dir)->i_last_alloc_group = group; 685ac27a0ecSDave Kleikamp err = -ENOSPC; 6862aa9fc4cSAvantika Mathur if (ret2 == -1) 687ac27a0ecSDave Kleikamp goto out; 688ac27a0ecSDave Kleikamp 689119c0d44STheodore Ts'o /* 690119c0d44STheodore Ts'o * Normally we will only go through one pass of this loop, 691119c0d44STheodore Ts'o * unless we get unlucky and it turns out the group we selected 692119c0d44STheodore Ts'o * had its last inode grabbed by someone else. 693119c0d44STheodore Ts'o */ 69411013911SAndreas Dilger for (i = 0; i < ngroups; i++, ino = 0) { 695ac27a0ecSDave Kleikamp err = -EIO; 696ac27a0ecSDave Kleikamp 6973300bedaSAneesh Kumar K.V gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 698ac27a0ecSDave Kleikamp if (!gdp) 699ac27a0ecSDave Kleikamp goto fail; 700ac27a0ecSDave Kleikamp 7013300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 7023300bedaSAneesh Kumar K.V inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); 7033300bedaSAneesh Kumar K.V if (!inode_bitmap_bh) 704ac27a0ecSDave Kleikamp goto fail; 705ac27a0ecSDave Kleikamp 706ac27a0ecSDave Kleikamp repeat_in_this_group: 707617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 7083300bedaSAneesh Kumar K.V inode_bitmap_bh->b_data, 7093300bedaSAneesh Kumar K.V EXT4_INODES_PER_GROUP(sb), ino); 710119c0d44STheodore Ts'o if (ino >= EXT4_INODES_PER_GROUP(sb)) { 7118df9675fSTheodore Ts'o if (++group == ngroups) 712ac27a0ecSDave Kleikamp group = 0; 713119c0d44STheodore Ts'o continue; 714119c0d44STheodore Ts'o } 715119c0d44STheodore Ts'o if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) { 716119c0d44STheodore Ts'o ext4_error(sb, "reserved inode found cleared - " 717119c0d44STheodore Ts'o "inode=%lu", ino + 1); 718119c0d44STheodore Ts'o continue; 719119c0d44STheodore Ts'o } 720119c0d44STheodore Ts'o ext4_lock_group(sb, group); 721119c0d44STheodore Ts'o ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); 722119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 723119c0d44STheodore Ts'o ino++; /* the inode bitmap is zero-based */ 724119c0d44STheodore Ts'o if (!ret2) 725119c0d44STheodore Ts'o goto got; /* we grabbed the inode! */ 726119c0d44STheodore Ts'o if (ino < EXT4_INODES_PER_GROUP(sb)) 727119c0d44STheodore Ts'o goto repeat_in_this_group; 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp err = -ENOSPC; 730ac27a0ecSDave Kleikamp goto out; 731ac27a0ecSDave Kleikamp 732ac27a0ecSDave Kleikamp got: 733717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 734717d50e4SAndreas Dilger if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) && 735717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 7363300bedaSAneesh Kumar K.V struct buffer_head *block_bitmap_bh; 737717d50e4SAndreas Dilger 7383300bedaSAneesh Kumar K.V block_bitmap_bh = ext4_read_block_bitmap(sb, group); 7393300bedaSAneesh Kumar K.V BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); 7403300bedaSAneesh Kumar K.V err = ext4_journal_get_write_access(handle, block_bitmap_bh); 741717d50e4SAndreas Dilger if (err) { 7423300bedaSAneesh Kumar K.V brelse(block_bitmap_bh); 743717d50e4SAndreas Dilger goto fail; 744717d50e4SAndreas Dilger } 745717d50e4SAndreas Dilger 746fd034a84STheodore Ts'o BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); 747fd034a84STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); 748fd034a84STheodore Ts'o brelse(block_bitmap_bh); 749fd034a84STheodore Ts'o 750717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 751fd034a84STheodore Ts'o ext4_lock_group(sb, group); 752717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 7533300bedaSAneesh Kumar K.V gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 754021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 755cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, group, gdp)); 75623712a9cSFrederic Bohe gdp->bg_checksum = ext4_group_desc_csum(sbi, group, 75723712a9cSFrederic Bohe gdp); 758717d50e4SAndreas Dilger } 759955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, group); 760717d50e4SAndreas Dilger 761717d50e4SAndreas Dilger if (err) 762717d50e4SAndreas Dilger goto fail; 763717d50e4SAndreas Dilger } 764119c0d44STheodore Ts'o 765119c0d44STheodore Ts'o BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); 766119c0d44STheodore Ts'o err = ext4_journal_get_write_access(handle, inode_bitmap_bh); 767119c0d44STheodore Ts'o if (err) 768119c0d44STheodore Ts'o goto fail; 769119c0d44STheodore Ts'o 770119c0d44STheodore Ts'o BUFFER_TRACE(group_desc_bh, "get_write_access"); 771119c0d44STheodore Ts'o err = ext4_journal_get_write_access(handle, group_desc_bh); 772119c0d44STheodore Ts'o if (err) 773119c0d44STheodore Ts'o goto fail; 774119c0d44STheodore Ts'o 775119c0d44STheodore Ts'o /* Update the relevant bg descriptor fields */ 77641a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 777119c0d44STheodore Ts'o int free; 778119c0d44STheodore Ts'o struct ext4_group_info *grp = ext4_get_group_info(sb, group); 779119c0d44STheodore Ts'o 780119c0d44STheodore Ts'o down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ 781119c0d44STheodore Ts'o ext4_lock_group(sb, group); /* while we modify the bg desc */ 782119c0d44STheodore Ts'o free = EXT4_INODES_PER_GROUP(sb) - 783119c0d44STheodore Ts'o ext4_itable_unused_count(sb, gdp); 784119c0d44STheodore Ts'o if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 785119c0d44STheodore Ts'o gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 786119c0d44STheodore Ts'o free = 0; 787119c0d44STheodore Ts'o } 788119c0d44STheodore Ts'o /* 789119c0d44STheodore Ts'o * Check the relative inode number against the last used 790119c0d44STheodore Ts'o * relative inode number in this group. if it is greater 791119c0d44STheodore Ts'o * we need to update the bg_itable_unused count 792119c0d44STheodore Ts'o */ 793119c0d44STheodore Ts'o if (ino > free) 794119c0d44STheodore Ts'o ext4_itable_unused_set(sb, gdp, 795119c0d44STheodore Ts'o (EXT4_INODES_PER_GROUP(sb) - ino)); 796119c0d44STheodore Ts'o up_read(&grp->alloc_sem); 797119c0d44STheodore Ts'o } 798119c0d44STheodore Ts'o ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); 799119c0d44STheodore Ts'o if (S_ISDIR(mode)) { 800119c0d44STheodore Ts'o ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); 801119c0d44STheodore Ts'o if (sbi->s_log_groups_per_flex) { 802119c0d44STheodore Ts'o ext4_group_t f = ext4_flex_group(sbi, group); 803119c0d44STheodore Ts'o 804119c0d44STheodore Ts'o atomic_inc(&sbi->s_flex_groups[f].used_dirs); 805119c0d44STheodore Ts'o } 806119c0d44STheodore Ts'o } 80741a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 80841a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, 80941a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 810119c0d44STheodore Ts'o gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 811119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 812119c0d44STheodore Ts'o } 813119c0d44STheodore Ts'o 814119c0d44STheodore Ts'o BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); 815119c0d44STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); 816119c0d44STheodore Ts'o if (err) 817119c0d44STheodore Ts'o goto fail; 818119c0d44STheodore Ts'o 8193300bedaSAneesh Kumar K.V BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); 8203300bedaSAneesh Kumar K.V err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); 82139341867SAneesh Kumar K.V if (err) 82239341867SAneesh Kumar K.V goto fail; 823ac27a0ecSDave Kleikamp 824ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 825ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 826ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 827a0375156STheodore Ts'o ext4_mark_super_dirty(sb); 828ac27a0ecSDave Kleikamp 829772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 830772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 8319f24e420STheodore Ts'o atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); 832772cb7c8SJose R. Santos } 8335cb81dabSDmitry Monakhov if (owner) { 8345cb81dabSDmitry Monakhov inode->i_mode = mode; 8355cb81dabSDmitry Monakhov inode->i_uid = owner[0]; 8365cb81dabSDmitry Monakhov inode->i_gid = owner[1]; 8375cb81dabSDmitry Monakhov } else if (test_opt(sb, GRPID)) { 838ac27a0ecSDave Kleikamp inode->i_mode = mode; 839b10b8520SDmitry Monakhov inode->i_uid = current_fsuid(); 840b10b8520SDmitry Monakhov inode->i_gid = dir->i_gid; 841b10b8520SDmitry Monakhov } else 842b10b8520SDmitry Monakhov inode_init_owner(inode, dir, mode); 843ac27a0ecSDave Kleikamp 844717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 845ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 846ac27a0ecSDave Kleikamp inode->i_blocks = 0; 847ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 848ef7f3835SKalpak Shah ext4_current_time(inode); 849ac27a0ecSDave Kleikamp 850ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 851ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 852ac27a0ecSDave Kleikamp ei->i_disksize = 0; 853ac27a0ecSDave Kleikamp 8544af83508SEryu Guan /* Don't inherit extent flag from directory, amongst others. */ 8552dc6b0d4SDuane Griffin ei->i_flags = 8562dc6b0d4SDuane Griffin ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); 857ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 858ac27a0ecSDave Kleikamp ei->i_dtime = 0; 859ac27a0ecSDave Kleikamp ei->i_block_group = group; 860a4912123STheodore Ts'o ei->i_last_alloc_group = ~0; 861ac27a0ecSDave Kleikamp 862617ba13bSMingming Cao ext4_set_inode_flags(inode); 863ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 8640390131bSFrank Mayhar ext4_handle_sync(handle); 8656b38e842SAl Viro if (insert_inode_locked(inode) < 0) { 866acd6ad83SJan Kara /* 867acd6ad83SJan Kara * Likely a bitmap corruption causing inode to be allocated 868acd6ad83SJan Kara * twice. 869acd6ad83SJan Kara */ 870acd6ad83SJan Kara err = -EIO; 871acd6ad83SJan Kara goto fail; 8726b38e842SAl Viro } 873ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 874ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 875ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 876ac27a0ecSDave Kleikamp 877814525f4SDarrick J. Wong /* Precompute checksum seed for inode metadata */ 878814525f4SDarrick J. Wong if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 879814525f4SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 880814525f4SDarrick J. Wong __u32 csum; 881814525f4SDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 882814525f4SDarrick J. Wong __le32 inum = cpu_to_le32(inode->i_ino); 883814525f4SDarrick J. Wong __le32 gen = cpu_to_le32(inode->i_generation); 884814525f4SDarrick J. Wong csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, 885814525f4SDarrick J. Wong sizeof(inum)); 886814525f4SDarrick J. Wong ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, 887814525f4SDarrick J. Wong sizeof(gen)); 888814525f4SDarrick J. Wong } 889814525f4SDarrick J. Wong 890353eb83cSTheodore Ts'o ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ 89119f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NEW); 892ef7f3835SKalpak Shah 893ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 894ac27a0ecSDave Kleikamp 895ac27a0ecSDave Kleikamp ret = inode; 896871a2931SChristoph Hellwig dquot_initialize(inode); 89763936ddaSChristoph Hellwig err = dquot_alloc_inode(inode); 89863936ddaSChristoph Hellwig if (err) 899ac27a0ecSDave Kleikamp goto fail_drop; 900ac27a0ecSDave Kleikamp 901617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 902ac27a0ecSDave Kleikamp if (err) 903ac27a0ecSDave Kleikamp goto fail_free_drop; 904ac27a0ecSDave Kleikamp 9052a7dba39SEric Paris err = ext4_init_security(handle, inode, dir, qstr); 906ac27a0ecSDave Kleikamp if (err) 907ac27a0ecSDave Kleikamp goto fail_free_drop; 908ac27a0ecSDave Kleikamp 90983982b6fSTheodore Ts'o if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 910e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 911e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 91212e9b892SDmitry Monakhov ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); 913a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 914a86c6181SAlex Tomas } 91542bf0383SAneesh Kumar K.V } 916ac27a0ecSDave Kleikamp 917688f869cSTheodore Ts'o if (ext4_handle_valid(handle)) { 918688f869cSTheodore Ts'o ei->i_sync_tid = handle->h_transaction->t_tid; 919688f869cSTheodore Ts'o ei->i_datasync_tid = handle->h_transaction->t_tid; 920688f869cSTheodore Ts'o } 921688f869cSTheodore Ts'o 9228753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 9238753e88fSAneesh Kumar K.V if (err) { 9248753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 9258753e88fSAneesh Kumar K.V goto fail_free_drop; 9268753e88fSAneesh Kumar K.V } 9278753e88fSAneesh Kumar K.V 928617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 9299bffad1eSTheodore Ts'o trace_ext4_allocate_inode(inode, dir, mode); 930ac27a0ecSDave Kleikamp goto really_out; 931ac27a0ecSDave Kleikamp fail: 932617ba13bSMingming Cao ext4_std_error(sb, err); 933ac27a0ecSDave Kleikamp out: 934ac27a0ecSDave Kleikamp iput(inode); 935ac27a0ecSDave Kleikamp ret = ERR_PTR(err); 936ac27a0ecSDave Kleikamp really_out: 9373300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 938ac27a0ecSDave Kleikamp return ret; 939ac27a0ecSDave Kleikamp 940ac27a0ecSDave Kleikamp fail_free_drop: 94163936ddaSChristoph Hellwig dquot_free_inode(inode); 942ac27a0ecSDave Kleikamp 943ac27a0ecSDave Kleikamp fail_drop: 9449f754758SChristoph Hellwig dquot_drop(inode); 945ac27a0ecSDave Kleikamp inode->i_flags |= S_NOQUOTA; 9466d6b77f1SMiklos Szeredi clear_nlink(inode); 9476b38e842SAl Viro unlock_new_inode(inode); 948ac27a0ecSDave Kleikamp iput(inode); 9493300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 950ac27a0ecSDave Kleikamp return ERR_PTR(err); 951ac27a0ecSDave Kleikamp } 952ac27a0ecSDave Kleikamp 953ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 954617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 955ac27a0ecSDave Kleikamp { 956617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 957fd2d4291SAvantika Mathur ext4_group_t block_group; 958ac27a0ecSDave Kleikamp int bit; 9591d1fe1eeSDavid Howells struct buffer_head *bitmap_bh; 960ac27a0ecSDave Kleikamp struct inode *inode = NULL; 9611d1fe1eeSDavid Howells long err = -EIO; 962ac27a0ecSDave Kleikamp 963ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 964ac27a0ecSDave Kleikamp if (ino > max_ino) { 96512062dddSEric Sandeen ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino); 9661d1fe1eeSDavid Howells goto error; 967ac27a0ecSDave Kleikamp } 968ac27a0ecSDave Kleikamp 969617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 970617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 971e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 972ac27a0ecSDave Kleikamp if (!bitmap_bh) { 97312062dddSEric Sandeen ext4_warning(sb, "inode bitmap error for orphan %lu", ino); 9741d1fe1eeSDavid Howells goto error; 975ac27a0ecSDave Kleikamp } 976ac27a0ecSDave Kleikamp 977ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 978ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 979ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 980ac27a0ecSDave Kleikamp */ 9811d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 9821d1fe1eeSDavid Howells goto bad_orphan; 9831d1fe1eeSDavid Howells 9841d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 9851d1fe1eeSDavid Howells if (IS_ERR(inode)) 9861d1fe1eeSDavid Howells goto iget_failed; 9871d1fe1eeSDavid Howells 98891ef4cafSDuane Griffin /* 98991ef4cafSDuane Griffin * If the orphans has i_nlinks > 0 then it should be able to be 99091ef4cafSDuane Griffin * truncated, otherwise it won't be removed from the orphan list 99191ef4cafSDuane Griffin * during processing and an infinite loop will result. 99291ef4cafSDuane Griffin */ 99391ef4cafSDuane Griffin if (inode->i_nlink && !ext4_can_truncate(inode)) 99491ef4cafSDuane Griffin goto bad_orphan; 99591ef4cafSDuane Griffin 9961d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 9971d1fe1eeSDavid Howells goto bad_orphan; 9981d1fe1eeSDavid Howells brelse(bitmap_bh); 9991d1fe1eeSDavid Howells return inode; 10001d1fe1eeSDavid Howells 10011d1fe1eeSDavid Howells iget_failed: 10021d1fe1eeSDavid Howells err = PTR_ERR(inode); 10031d1fe1eeSDavid Howells inode = NULL; 10041d1fe1eeSDavid Howells bad_orphan: 100512062dddSEric Sandeen ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino); 1006617ba13bSMingming Cao printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n", 1007ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 1008617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 1009ac27a0ecSDave Kleikamp printk(KERN_NOTICE "inode=%p\n", inode); 1010ac27a0ecSDave Kleikamp if (inode) { 1011ac27a0ecSDave Kleikamp printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", 1012ac27a0ecSDave Kleikamp is_bad_inode(inode)); 1013ac27a0ecSDave Kleikamp printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", 1014ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 1015ac27a0ecSDave Kleikamp printk(KERN_NOTICE "max_ino=%lu\n", max_ino); 101691ef4cafSDuane Griffin printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); 1017ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 10181d1fe1eeSDavid Howells if (inode->i_nlink == 0) 1019ac27a0ecSDave Kleikamp inode->i_blocks = 0; 1020ac27a0ecSDave Kleikamp iput(inode); 1021ac27a0ecSDave Kleikamp } 1022ac27a0ecSDave Kleikamp brelse(bitmap_bh); 10231d1fe1eeSDavid Howells error: 10241d1fe1eeSDavid Howells return ERR_PTR(err); 1025ac27a0ecSDave Kleikamp } 1026ac27a0ecSDave Kleikamp 1027617ba13bSMingming Cao unsigned long ext4_count_free_inodes(struct super_block *sb) 1028ac27a0ecSDave Kleikamp { 1029ac27a0ecSDave Kleikamp unsigned long desc_count; 1030617ba13bSMingming Cao struct ext4_group_desc *gdp; 10318df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1032617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 1033617ba13bSMingming Cao struct ext4_super_block *es; 1034ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 1035ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 1036ac27a0ecSDave Kleikamp 1037617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 1038ac27a0ecSDave Kleikamp desc_count = 0; 1039ac27a0ecSDave Kleikamp bitmap_count = 0; 1040ac27a0ecSDave Kleikamp gdp = NULL; 10418df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1042617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1043ac27a0ecSDave Kleikamp if (!gdp) 1044ac27a0ecSDave Kleikamp continue; 1045560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1046ac27a0ecSDave Kleikamp brelse(bitmap_bh); 1047e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 1048ac27a0ecSDave Kleikamp if (!bitmap_bh) 1049ac27a0ecSDave Kleikamp continue; 1050ac27a0ecSDave Kleikamp 1051617ba13bSMingming Cao x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8); 1052c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 1053785b4b3aSPeng Tao (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); 1054ac27a0ecSDave Kleikamp bitmap_count += x; 1055ac27a0ecSDave Kleikamp } 1056ac27a0ecSDave Kleikamp brelse(bitmap_bh); 10574776004fSTheodore Ts'o printk(KERN_DEBUG "ext4_count_free_inodes: " 10584776004fSTheodore Ts'o "stored = %u, computed = %lu, %lu\n", 1059ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 1060ac27a0ecSDave Kleikamp return desc_count; 1061ac27a0ecSDave Kleikamp #else 1062ac27a0ecSDave Kleikamp desc_count = 0; 10638df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1064617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1065ac27a0ecSDave Kleikamp if (!gdp) 1066ac27a0ecSDave Kleikamp continue; 1067560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1068ac27a0ecSDave Kleikamp cond_resched(); 1069ac27a0ecSDave Kleikamp } 1070ac27a0ecSDave Kleikamp return desc_count; 1071ac27a0ecSDave Kleikamp #endif 1072ac27a0ecSDave Kleikamp } 1073ac27a0ecSDave Kleikamp 1074ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1075617ba13bSMingming Cao unsigned long ext4_count_dirs(struct super_block * sb) 1076ac27a0ecSDave Kleikamp { 1077ac27a0ecSDave Kleikamp unsigned long count = 0; 10788df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1079ac27a0ecSDave Kleikamp 10808df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1081617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1082ac27a0ecSDave Kleikamp if (!gdp) 1083ac27a0ecSDave Kleikamp continue; 1084560671a0SAneesh Kumar K.V count += ext4_used_dirs_count(sb, gdp); 1085ac27a0ecSDave Kleikamp } 1086ac27a0ecSDave Kleikamp return count; 1087ac27a0ecSDave Kleikamp } 1088bfff6873SLukas Czerner 1089bfff6873SLukas Czerner /* 1090bfff6873SLukas Czerner * Zeroes not yet zeroed inode table - just write zeroes through the whole 1091bfff6873SLukas Czerner * inode table. Must be called without any spinlock held. The only place 1092bfff6873SLukas Czerner * where it is called from on active part of filesystem is ext4lazyinit 1093bfff6873SLukas Czerner * thread, so we do not need any special locks, however we have to prevent 1094bfff6873SLukas Czerner * inode allocation from the current group, so we take alloc_sem lock, to 1095119c0d44STheodore Ts'o * block ext4_new_inode() until we are finished. 1096bfff6873SLukas Czerner */ 1097e0cbee3eSH Hartley Sweeten int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, 1098bfff6873SLukas Czerner int barrier) 1099bfff6873SLukas Czerner { 1100bfff6873SLukas Czerner struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1101bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 1102bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 1103bfff6873SLukas Czerner struct buffer_head *group_desc_bh; 1104bfff6873SLukas Czerner handle_t *handle; 1105bfff6873SLukas Czerner ext4_fsblk_t blk; 1106bfff6873SLukas Czerner int num, ret = 0, used_blks = 0; 1107bfff6873SLukas Czerner 1108bfff6873SLukas Czerner /* This should not happen, but just to be sure check this */ 1109bfff6873SLukas Czerner if (sb->s_flags & MS_RDONLY) { 1110bfff6873SLukas Czerner ret = 1; 1111bfff6873SLukas Czerner goto out; 1112bfff6873SLukas Czerner } 1113bfff6873SLukas Czerner 1114bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 1115bfff6873SLukas Czerner if (!gdp) 1116bfff6873SLukas Czerner goto out; 1117bfff6873SLukas Czerner 1118bfff6873SLukas Czerner /* 1119bfff6873SLukas Czerner * We do not need to lock this, because we are the only one 1120bfff6873SLukas Czerner * handling this flag. 1121bfff6873SLukas Czerner */ 1122bfff6873SLukas Czerner if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) 1123bfff6873SLukas Czerner goto out; 1124bfff6873SLukas Czerner 1125bfff6873SLukas Czerner handle = ext4_journal_start_sb(sb, 1); 1126bfff6873SLukas Czerner if (IS_ERR(handle)) { 1127bfff6873SLukas Czerner ret = PTR_ERR(handle); 1128bfff6873SLukas Czerner goto out; 1129bfff6873SLukas Czerner } 1130bfff6873SLukas Czerner 1131bfff6873SLukas Czerner down_write(&grp->alloc_sem); 1132bfff6873SLukas Czerner /* 1133bfff6873SLukas Czerner * If inode bitmap was already initialized there may be some 1134bfff6873SLukas Czerner * used inodes so we need to skip blocks with used inodes in 1135bfff6873SLukas Czerner * inode table. 1136bfff6873SLukas Czerner */ 1137bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) 1138bfff6873SLukas Czerner used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - 1139bfff6873SLukas Czerner ext4_itable_unused_count(sb, gdp)), 1140bfff6873SLukas Czerner sbi->s_inodes_per_block); 1141bfff6873SLukas Czerner 1142857ac889SLukas Czerner if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { 11431084f252STheodore Ts'o ext4_error(sb, "Something is wrong with group %u: " 11441084f252STheodore Ts'o "used itable blocks: %d; " 11451084f252STheodore Ts'o "itable unused count: %u", 1146857ac889SLukas Czerner group, used_blks, 1147857ac889SLukas Czerner ext4_itable_unused_count(sb, gdp)); 1148857ac889SLukas Czerner ret = 1; 114933853a0dSYongqiang Yang goto err_out; 1150857ac889SLukas Czerner } 1151857ac889SLukas Czerner 1152bfff6873SLukas Czerner blk = ext4_inode_table(sb, gdp) + used_blks; 1153bfff6873SLukas Czerner num = sbi->s_itb_per_group - used_blks; 1154bfff6873SLukas Czerner 1155bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, "get_write_access"); 1156bfff6873SLukas Czerner ret = ext4_journal_get_write_access(handle, 1157bfff6873SLukas Czerner group_desc_bh); 1158bfff6873SLukas Czerner if (ret) 1159bfff6873SLukas Czerner goto err_out; 1160bfff6873SLukas Czerner 1161bfff6873SLukas Czerner /* 1162bfff6873SLukas Czerner * Skip zeroout if the inode table is full. But we set the ZEROED 1163bfff6873SLukas Czerner * flag anyway, because obviously, when it is full it does not need 1164bfff6873SLukas Czerner * further zeroing. 1165bfff6873SLukas Czerner */ 1166bfff6873SLukas Czerner if (unlikely(num == 0)) 1167bfff6873SLukas Czerner goto skip_zeroout; 1168bfff6873SLukas Czerner 1169bfff6873SLukas Czerner ext4_debug("going to zero out inode table in group %d\n", 1170bfff6873SLukas Czerner group); 1171a107e5a3STheodore Ts'o ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); 1172bfff6873SLukas Czerner if (ret < 0) 1173bfff6873SLukas Czerner goto err_out; 1174a107e5a3STheodore Ts'o if (barrier) 1175a107e5a3STheodore Ts'o blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); 1176bfff6873SLukas Czerner 1177bfff6873SLukas Czerner skip_zeroout: 1178bfff6873SLukas Czerner ext4_lock_group(sb, group); 1179bfff6873SLukas Czerner gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); 1180bfff6873SLukas Czerner gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); 1181bfff6873SLukas Czerner ext4_unlock_group(sb, group); 1182bfff6873SLukas Czerner 1183bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, 1184bfff6873SLukas Czerner "call ext4_handle_dirty_metadata"); 1185bfff6873SLukas Czerner ret = ext4_handle_dirty_metadata(handle, NULL, 1186bfff6873SLukas Czerner group_desc_bh); 1187bfff6873SLukas Czerner 1188bfff6873SLukas Czerner err_out: 1189bfff6873SLukas Czerner up_write(&grp->alloc_sem); 1190bfff6873SLukas Czerner ext4_journal_stop(handle); 1191bfff6873SLukas Czerner out: 1192bfff6873SLukas Czerner return ret; 1193bfff6873SLukas Czerner } 1194