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 J_ASSERT_BH(bh, buffer_locked(bh)); 74717d50e4SAndreas Dilger 75717d50e4SAndreas Dilger /* If checksum is bad mark all blocks and inodes use to prevent 76717d50e4SAndreas Dilger * allocation, essentially implementing a per-group read-only flag. */ 77feb0ab32SDarrick J. Wong if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { 7812062dddSEric Sandeen ext4_error(sb, "Checksum bad for group %u", block_group); 79021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 0); 80560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, 0); 81560671a0SAneesh Kumar K.V ext4_itable_unused_set(sb, gdp, 0); 82717d50e4SAndreas Dilger memset(bh->b_data, 0xff, sb->s_blocksize); 8341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, 8441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 85717d50e4SAndreas Dilger return 0; 86717d50e4SAndreas Dilger } 87717d50e4SAndreas Dilger 88717d50e4SAndreas Dilger memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 8961d08673STheodore Ts'o ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, 90717d50e4SAndreas Dilger bh->b_data); 9141a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, 9241a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 93feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, block_group, gdp); 94717d50e4SAndreas Dilger 95717d50e4SAndreas Dilger return EXT4_INODES_PER_GROUP(sb); 96717d50e4SAndreas Dilger } 97ac27a0ecSDave Kleikamp 98813e5727STheodore Ts'o void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) 99813e5727STheodore Ts'o { 100813e5727STheodore Ts'o if (uptodate) { 101813e5727STheodore Ts'o set_buffer_uptodate(bh); 102813e5727STheodore Ts'o set_bitmap_uptodate(bh); 103813e5727STheodore Ts'o } 104813e5727STheodore Ts'o unlock_buffer(bh); 105813e5727STheodore Ts'o put_bh(bh); 106813e5727STheodore Ts'o } 107813e5727STheodore Ts'o 108ac27a0ecSDave Kleikamp /* 109ac27a0ecSDave Kleikamp * Read the inode allocation bitmap for a given block_group, reading 110ac27a0ecSDave Kleikamp * into the specified slot in the superblock's bitmap cache. 111ac27a0ecSDave Kleikamp * 112ac27a0ecSDave Kleikamp * Return buffer_head of bitmap on success or NULL. 113ac27a0ecSDave Kleikamp */ 114ac27a0ecSDave Kleikamp static struct buffer_head * 115e29d1cdeSEric Sandeen ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) 116ac27a0ecSDave Kleikamp { 117617ba13bSMingming Cao struct ext4_group_desc *desc; 118ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 119e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 12087a39389SDarrick J. Wong struct ext4_group_info *grp; 121ac27a0ecSDave Kleikamp 122617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 123ac27a0ecSDave Kleikamp if (!desc) 124e29d1cdeSEric Sandeen return NULL; 125bfff6873SLukas Czerner 126e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 127e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 128e29d1cdeSEric Sandeen if (unlikely(!bh)) { 12912062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 130a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 131e29d1cdeSEric Sandeen block_group, bitmap_blk); 132e29d1cdeSEric Sandeen return NULL; 133e29d1cdeSEric Sandeen } 1342ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) 13541a246d1SDarrick J. Wong goto verify; 136e29d1cdeSEric Sandeen 137c806e68fSFrederic Bohe lock_buffer(bh); 1382ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) { 1392ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 14041a246d1SDarrick J. Wong goto verify; 1412ccb5fb9SAneesh Kumar K.V } 142bfff6873SLukas Czerner 143955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 144e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 145e29d1cdeSEric Sandeen ext4_init_inode_bitmap(sb, bh, block_group, desc); 1462ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 147e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 14841a246d1SDarrick J. Wong set_buffer_verified(bh); 149955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 1503300bedaSAneesh Kumar K.V unlock_buffer(bh); 151e29d1cdeSEric Sandeen return bh; 152e29d1cdeSEric Sandeen } 153955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 154bfff6873SLukas Czerner 1552ccb5fb9SAneesh Kumar K.V if (buffer_uptodate(bh)) { 1562ccb5fb9SAneesh Kumar K.V /* 1572ccb5fb9SAneesh Kumar K.V * if not uninit if bh is uptodate, 1582ccb5fb9SAneesh Kumar K.V * bitmap is also uptodate 1592ccb5fb9SAneesh Kumar K.V */ 1602ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 1612ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 16241a246d1SDarrick J. Wong goto verify; 1632ccb5fb9SAneesh Kumar K.V } 1642ccb5fb9SAneesh Kumar K.V /* 165813e5727STheodore Ts'o * submit the buffer_head for reading 1662ccb5fb9SAneesh Kumar K.V */ 1670562e0baSJiaying Zhang trace_ext4_load_inode_bitmap(sb, block_group); 168813e5727STheodore Ts'o bh->b_end_io = ext4_end_bitmap_read; 169813e5727STheodore Ts'o get_bh(bh); 1709f203507STheodore Ts'o submit_bh(READ | REQ_META | REQ_PRIO, bh); 171813e5727STheodore Ts'o wait_on_buffer(bh); 172813e5727STheodore Ts'o if (!buffer_uptodate(bh)) { 173e29d1cdeSEric Sandeen put_bh(bh); 17412062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 175a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 176e29d1cdeSEric Sandeen block_group, bitmap_blk); 177e29d1cdeSEric Sandeen return NULL; 178e29d1cdeSEric Sandeen } 17941a246d1SDarrick J. Wong 18041a246d1SDarrick J. Wong verify: 18141a246d1SDarrick J. Wong ext4_lock_group(sb, block_group); 18241a246d1SDarrick J. Wong if (!buffer_verified(bh) && 18341a246d1SDarrick J. Wong !ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, 18441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8)) { 18541a246d1SDarrick J. Wong ext4_unlock_group(sb, block_group); 18641a246d1SDarrick J. Wong put_bh(bh); 18741a246d1SDarrick J. Wong ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " 18841a246d1SDarrick J. Wong "inode_bitmap = %llu", block_group, bitmap_blk); 18987a39389SDarrick J. Wong grp = ext4_get_group_info(sb, block_group); 19087a39389SDarrick J. Wong set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); 19141a246d1SDarrick J. Wong return NULL; 19241a246d1SDarrick J. Wong } 19341a246d1SDarrick J. Wong ext4_unlock_group(sb, block_group); 19441a246d1SDarrick J. Wong set_buffer_verified(bh); 195ac27a0ecSDave Kleikamp return bh; 196ac27a0ecSDave Kleikamp } 197ac27a0ecSDave Kleikamp 198ac27a0ecSDave Kleikamp /* 199ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 200ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 201ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 202ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 203ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 204ac27a0ecSDave Kleikamp * has been deleted earlier. 205ac27a0ecSDave Kleikamp * 206ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 207ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 208ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 209ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 210ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 211ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 212ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 213ac27a0ecSDave Kleikamp */ 214617ba13bSMingming Cao void ext4_free_inode(handle_t *handle, struct inode *inode) 215ac27a0ecSDave Kleikamp { 216ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 217ac27a0ecSDave Kleikamp int is_directory; 218ac27a0ecSDave Kleikamp unsigned long ino; 219ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 220ac27a0ecSDave Kleikamp struct buffer_head *bh2; 221fd2d4291SAvantika Mathur ext4_group_t block_group; 222ac27a0ecSDave Kleikamp unsigned long bit; 223617ba13bSMingming Cao struct ext4_group_desc *gdp; 224617ba13bSMingming Cao struct ext4_super_block *es; 225617ba13bSMingming Cao struct ext4_sb_info *sbi; 2267ce9d5d1SEric Sandeen int fatal = 0, err, count, cleared; 22787a39389SDarrick J. Wong struct ext4_group_info *grp; 228ac27a0ecSDave Kleikamp 22992b97816STheodore Ts'o if (!sb) { 23092b97816STheodore Ts'o printk(KERN_ERR "EXT4-fs: %s:%d: inode on " 23192b97816STheodore Ts'o "nonexistent device\n", __func__, __LINE__); 23292b97816STheodore Ts'o return; 23392b97816STheodore Ts'o } 234ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 23592b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", 23692b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, 237ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 238ac27a0ecSDave Kleikamp return; 239ac27a0ecSDave Kleikamp } 240ac27a0ecSDave Kleikamp if (inode->i_nlink) { 24192b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", 24292b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, inode->i_nlink); 243ac27a0ecSDave Kleikamp return; 244ac27a0ecSDave Kleikamp } 245617ba13bSMingming Cao sbi = EXT4_SB(sb); 246ac27a0ecSDave Kleikamp 247ac27a0ecSDave Kleikamp ino = inode->i_ino; 248617ba13bSMingming Cao ext4_debug("freeing inode %lu\n", ino); 2499bffad1eSTheodore Ts'o trace_ext4_free_inode(inode); 250ac27a0ecSDave Kleikamp 251ac27a0ecSDave Kleikamp /* 252ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 253ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 254ac27a0ecSDave Kleikamp */ 255871a2931SChristoph Hellwig dquot_initialize(inode); 256617ba13bSMingming Cao ext4_xattr_delete_inode(handle, inode); 25763936ddaSChristoph Hellwig dquot_free_inode(inode); 2589f754758SChristoph Hellwig dquot_drop(inode); 259ac27a0ecSDave Kleikamp 260ac27a0ecSDave Kleikamp is_directory = S_ISDIR(inode->i_mode); 261ac27a0ecSDave Kleikamp 262ac27a0ecSDave Kleikamp /* Do this BEFORE marking the inode not in use or returning an error */ 2630930fcc1SAl Viro ext4_clear_inode(inode); 264ac27a0ecSDave Kleikamp 265617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 266617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { 26712062dddSEric Sandeen ext4_error(sb, "reserved or nonexistent inode %lu", ino); 268ac27a0ecSDave Kleikamp goto error_return; 269ac27a0ecSDave Kleikamp } 270617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 271617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 272e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 27387a39389SDarrick J. Wong /* Don't bother if the inode bitmap is corrupt. */ 27487a39389SDarrick J. Wong grp = ext4_get_group_info(sb, block_group); 27587a39389SDarrick J. Wong if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) || !bitmap_bh) 276ac27a0ecSDave Kleikamp goto error_return; 277ac27a0ecSDave Kleikamp 278ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 279617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 280ac27a0ecSDave Kleikamp if (fatal) 281ac27a0ecSDave Kleikamp goto error_return; 282ac27a0ecSDave Kleikamp 283d17413c0SDmitry Monakhov fatal = -ESRCH; 284617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, block_group, &bh2); 285d17413c0SDmitry Monakhov if (gdp) { 286ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 287617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 288d17413c0SDmitry Monakhov } 289955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 290597d508cSAkinobu Mita cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); 291d17413c0SDmitry Monakhov if (fatal || !cleared) { 292d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 293d17413c0SDmitry Monakhov goto out; 294d17413c0SDmitry Monakhov } 295d17413c0SDmitry Monakhov 296560671a0SAneesh Kumar K.V count = ext4_free_inodes_count(sb, gdp) + 1; 297560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, count); 298560671a0SAneesh Kumar K.V if (is_directory) { 299560671a0SAneesh Kumar K.V count = ext4_used_dirs_count(sb, gdp) - 1; 300560671a0SAneesh Kumar K.V ext4_used_dirs_set(sb, gdp, count); 301d17413c0SDmitry Monakhov percpu_counter_dec(&sbi->s_dirs_counter); 302d17413c0SDmitry Monakhov } 30341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, 30441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 305feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, block_group, gdp); 306d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 3077d39db14STheodore Ts'o 308d17413c0SDmitry Monakhov percpu_counter_inc(&sbi->s_freeinodes_counter); 309d17413c0SDmitry Monakhov if (sbi->s_log_groups_per_flex) { 310d17413c0SDmitry Monakhov ext4_group_t f = ext4_flex_group(sbi, block_group); 311d17413c0SDmitry Monakhov 312d17413c0SDmitry Monakhov atomic_inc(&sbi->s_flex_groups[f].free_inodes); 313d17413c0SDmitry Monakhov if (is_directory) 314c4caae25SEric Sandeen atomic_dec(&sbi->s_flex_groups[f].used_dirs); 3157d39db14STheodore Ts'o } 3160390131bSFrank Mayhar BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); 317d17413c0SDmitry Monakhov fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); 318d17413c0SDmitry Monakhov out: 319d17413c0SDmitry Monakhov if (cleared) { 3200390131bSFrank Mayhar BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); 3210390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 322ac27a0ecSDave Kleikamp if (!fatal) 323ac27a0ecSDave Kleikamp fatal = err; 32487a39389SDarrick J. Wong } else { 325d17413c0SDmitry Monakhov ext4_error(sb, "bit already cleared for inode %lu", ino); 32687a39389SDarrick J. Wong set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); 32787a39389SDarrick J. Wong } 328d17413c0SDmitry Monakhov 329ac27a0ecSDave Kleikamp error_return: 330ac27a0ecSDave Kleikamp brelse(bitmap_bh); 331617ba13bSMingming Cao ext4_std_error(sb, fatal); 332ac27a0ecSDave Kleikamp } 333ac27a0ecSDave Kleikamp 334a4912123STheodore Ts'o struct orlov_stats { 33590ba983fSTheodore Ts'o __u64 free_clusters; 336a4912123STheodore Ts'o __u32 free_inodes; 337a4912123STheodore Ts'o __u32 used_dirs; 338a4912123STheodore Ts'o }; 339a4912123STheodore Ts'o 340a4912123STheodore Ts'o /* 341a4912123STheodore Ts'o * Helper function for Orlov's allocator; returns critical information 342a4912123STheodore Ts'o * for a particular block group or flex_bg. If flex_size is 1, then g 343a4912123STheodore Ts'o * is a block group number; otherwise it is flex_bg number. 344a4912123STheodore Ts'o */ 3451f109d5aSTheodore Ts'o static void get_orlov_stats(struct super_block *sb, ext4_group_t g, 346a4912123STheodore Ts'o int flex_size, struct orlov_stats *stats) 347a4912123STheodore Ts'o { 348a4912123STheodore Ts'o struct ext4_group_desc *desc; 3497d39db14STheodore Ts'o struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; 350a4912123STheodore Ts'o 3517d39db14STheodore Ts'o if (flex_size > 1) { 3527d39db14STheodore Ts'o stats->free_inodes = atomic_read(&flex_group[g].free_inodes); 35390ba983fSTheodore Ts'o stats->free_clusters = atomic64_read(&flex_group[g].free_clusters); 3547d39db14STheodore Ts'o stats->used_dirs = atomic_read(&flex_group[g].used_dirs); 3557d39db14STheodore Ts'o return; 3567d39db14STheodore Ts'o } 3577d39db14STheodore Ts'o 3587d39db14STheodore Ts'o desc = ext4_get_group_desc(sb, g, NULL); 3597d39db14STheodore Ts'o if (desc) { 3607d39db14STheodore Ts'o stats->free_inodes = ext4_free_inodes_count(sb, desc); 361021b65bbSTheodore Ts'o stats->free_clusters = ext4_free_group_clusters(sb, desc); 3627d39db14STheodore Ts'o stats->used_dirs = ext4_used_dirs_count(sb, desc); 3637d39db14STheodore Ts'o } else { 364a4912123STheodore Ts'o stats->free_inodes = 0; 36524aaa8efSTheodore Ts'o stats->free_clusters = 0; 366a4912123STheodore Ts'o stats->used_dirs = 0; 367a4912123STheodore Ts'o } 368a4912123STheodore Ts'o } 369a4912123STheodore Ts'o 370ac27a0ecSDave Kleikamp /* 371ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 372ac27a0ecSDave Kleikamp * 373ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 374ac27a0ecSDave Kleikamp * 375ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 376ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 377ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 378ac27a0ecSDave Kleikamp * 379ac27a0ecSDave Kleikamp * For the rest rules look so: 380ac27a0ecSDave Kleikamp * 381ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 382ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 383ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 384ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 3851cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 386ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 387ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 388ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 389ac27a0ecSDave Kleikamp */ 390ac27a0ecSDave Kleikamp 3912aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 392dcca3fecSAl Viro ext4_group_t *group, umode_t mode, 393f157a4aaSTheodore Ts'o const struct qstr *qstr) 394ac27a0ecSDave Kleikamp { 395fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 396617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3978df9675fSTheodore Ts'o ext4_group_t real_ngroups = ext4_get_groups_count(sb); 398617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 39914c83c9fSTheodore Ts'o unsigned int freei, avefreei, grp_free; 40024aaa8efSTheodore Ts'o ext4_fsblk_t freeb, avefreec; 401ac27a0ecSDave Kleikamp unsigned int ndirs; 402a4912123STheodore Ts'o int max_dirs, min_inodes; 40324aaa8efSTheodore Ts'o ext4_grpblk_t min_clusters; 4048df9675fSTheodore Ts'o ext4_group_t i, grp, g, ngroups; 405617ba13bSMingming Cao struct ext4_group_desc *desc; 406a4912123STheodore Ts'o struct orlov_stats stats; 407a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(sbi); 408f157a4aaSTheodore Ts'o struct dx_hash_info hinfo; 409a4912123STheodore Ts'o 4108df9675fSTheodore Ts'o ngroups = real_ngroups; 411a4912123STheodore Ts'o if (flex_size > 1) { 4128df9675fSTheodore Ts'o ngroups = (real_ngroups + flex_size - 1) >> 413a4912123STheodore Ts'o sbi->s_log_groups_per_flex; 414a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 415a4912123STheodore Ts'o } 416ac27a0ecSDave Kleikamp 417ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 418ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 41957042651STheodore Ts'o freeb = EXT4_C2B(sbi, 42057042651STheodore Ts'o percpu_counter_read_positive(&sbi->s_freeclusters_counter)); 42124aaa8efSTheodore Ts'o avefreec = freeb; 42224aaa8efSTheodore Ts'o do_div(avefreec, ngroups); 423ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 424ac27a0ecSDave Kleikamp 425a4912123STheodore Ts'o if (S_ISDIR(mode) && 426a4912123STheodore Ts'o ((parent == sb->s_root->d_inode) || 42712e9b892SDmitry Monakhov (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { 428ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4292aa9fc4cSAvantika Mathur int ret = -1; 430ac27a0ecSDave Kleikamp 431f157a4aaSTheodore Ts'o if (qstr) { 432f157a4aaSTheodore Ts'o hinfo.hash_version = DX_HASH_HALF_MD4; 433f157a4aaSTheodore Ts'o hinfo.seed = sbi->s_hash_seed; 434f157a4aaSTheodore Ts'o ext4fs_dirhash(qstr->name, qstr->len, &hinfo); 435f157a4aaSTheodore Ts'o grp = hinfo.hash; 436f157a4aaSTheodore Ts'o } else 4372aa9fc4cSAvantika Mathur get_random_bytes(&grp, sizeof(grp)); 4382aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 439ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 440a4912123STheodore Ts'o g = (parent_group + i) % ngroups; 441a4912123STheodore Ts'o get_orlov_stats(sb, g, flex_size, &stats); 442a4912123STheodore Ts'o if (!stats.free_inodes) 443ac27a0ecSDave Kleikamp continue; 444a4912123STheodore Ts'o if (stats.used_dirs >= best_ndir) 445ac27a0ecSDave Kleikamp continue; 446a4912123STheodore Ts'o if (stats.free_inodes < avefreei) 447ac27a0ecSDave Kleikamp continue; 44824aaa8efSTheodore Ts'o if (stats.free_clusters < avefreec) 449ac27a0ecSDave Kleikamp continue; 450a4912123STheodore Ts'o grp = g; 4512aa9fc4cSAvantika Mathur ret = 0; 452a4912123STheodore Ts'o best_ndir = stats.used_dirs; 453ac27a0ecSDave Kleikamp } 454a4912123STheodore Ts'o if (ret) 455a4912123STheodore Ts'o goto fallback; 456a4912123STheodore Ts'o found_flex_bg: 457a4912123STheodore Ts'o if (flex_size == 1) { 458a4912123STheodore Ts'o *group = grp; 459a4912123STheodore Ts'o return 0; 460a4912123STheodore Ts'o } 461a4912123STheodore Ts'o 462a4912123STheodore Ts'o /* 463a4912123STheodore Ts'o * We pack inodes at the beginning of the flexgroup's 464a4912123STheodore Ts'o * inode tables. Block allocation decisions will do 465a4912123STheodore Ts'o * something similar, although regular files will 466a4912123STheodore Ts'o * start at 2nd block group of the flexgroup. See 467a4912123STheodore Ts'o * ext4_ext_find_goal() and ext4_find_near(). 468a4912123STheodore Ts'o */ 469a4912123STheodore Ts'o grp *= flex_size; 470a4912123STheodore Ts'o for (i = 0; i < flex_size; i++) { 4718df9675fSTheodore Ts'o if (grp+i >= real_ngroups) 472a4912123STheodore Ts'o break; 473a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp+i, NULL); 474a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 475a4912123STheodore Ts'o *group = grp+i; 476a4912123STheodore Ts'o return 0; 477a4912123STheodore Ts'o } 478a4912123STheodore Ts'o } 479ac27a0ecSDave Kleikamp goto fallback; 480ac27a0ecSDave Kleikamp } 481ac27a0ecSDave Kleikamp 482ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 483a4912123STheodore Ts'o min_inodes = avefreei - inodes_per_group*flex_size / 4; 484a4912123STheodore Ts'o if (min_inodes < 1) 485a4912123STheodore Ts'o min_inodes = 1; 48624aaa8efSTheodore Ts'o min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; 487ac27a0ecSDave Kleikamp 488a4912123STheodore Ts'o /* 489a4912123STheodore Ts'o * Start looking in the flex group where we last allocated an 490a4912123STheodore Ts'o * inode for this parent directory 491a4912123STheodore Ts'o */ 492a4912123STheodore Ts'o if (EXT4_I(parent)->i_last_alloc_group != ~0) { 493a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 494a4912123STheodore Ts'o if (flex_size > 1) 495a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 496a4912123STheodore Ts'o } 497ac27a0ecSDave Kleikamp 498ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 499a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 500a4912123STheodore Ts'o get_orlov_stats(sb, grp, flex_size, &stats); 501a4912123STheodore Ts'o if (stats.used_dirs >= max_dirs) 502ac27a0ecSDave Kleikamp continue; 503a4912123STheodore Ts'o if (stats.free_inodes < min_inodes) 504ac27a0ecSDave Kleikamp continue; 50524aaa8efSTheodore Ts'o if (stats.free_clusters < min_clusters) 506ac27a0ecSDave Kleikamp continue; 507a4912123STheodore Ts'o goto found_flex_bg; 508ac27a0ecSDave Kleikamp } 509ac27a0ecSDave Kleikamp 510ac27a0ecSDave Kleikamp fallback: 5118df9675fSTheodore Ts'o ngroups = real_ngroups; 512a4912123STheodore Ts'o avefreei = freei / ngroups; 513b5451f7bSTheodore Ts'o fallback_retry: 514a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_block_group; 515ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 516a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 517a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp, NULL); 518bb3d132aSDan Carpenter if (desc) { 51914c83c9fSTheodore Ts'o grp_free = ext4_free_inodes_count(sb, desc); 520bb3d132aSDan Carpenter if (grp_free && grp_free >= avefreei) { 521a4912123STheodore Ts'o *group = grp; 5222aa9fc4cSAvantika Mathur return 0; 523ac27a0ecSDave Kleikamp } 524a4912123STheodore Ts'o } 525bb3d132aSDan Carpenter } 526ac27a0ecSDave Kleikamp 527ac27a0ecSDave Kleikamp if (avefreei) { 528ac27a0ecSDave Kleikamp /* 529ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 530ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 531ac27a0ecSDave Kleikamp */ 532ac27a0ecSDave Kleikamp avefreei = 0; 533b5451f7bSTheodore Ts'o goto fallback_retry; 534ac27a0ecSDave Kleikamp } 535ac27a0ecSDave Kleikamp 536ac27a0ecSDave Kleikamp return -1; 537ac27a0ecSDave Kleikamp } 538ac27a0ecSDave Kleikamp 5392aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 540dcca3fecSAl Viro ext4_group_t *group, umode_t mode) 541ac27a0ecSDave Kleikamp { 542fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 5438df9675fSTheodore Ts'o ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); 544617ba13bSMingming Cao struct ext4_group_desc *desc; 545a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); 546a4912123STheodore Ts'o 547a4912123STheodore Ts'o /* 548a4912123STheodore Ts'o * Try to place the inode is the same flex group as its 549a4912123STheodore Ts'o * parent. If we can't find space, use the Orlov algorithm to 550a4912123STheodore Ts'o * find another flex group, and store that information in the 551a4912123STheodore Ts'o * parent directory's inode information so that use that flex 552a4912123STheodore Ts'o * group for future allocations. 553a4912123STheodore Ts'o */ 554a4912123STheodore Ts'o if (flex_size > 1) { 555a4912123STheodore Ts'o int retry = 0; 556a4912123STheodore Ts'o 557a4912123STheodore Ts'o try_again: 558a4912123STheodore Ts'o parent_group &= ~(flex_size-1); 559a4912123STheodore Ts'o last = parent_group + flex_size; 560a4912123STheodore Ts'o if (last > ngroups) 561a4912123STheodore Ts'o last = ngroups; 562a4912123STheodore Ts'o for (i = parent_group; i < last; i++) { 563a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, i, NULL); 564a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 565a4912123STheodore Ts'o *group = i; 566a4912123STheodore Ts'o return 0; 567a4912123STheodore Ts'o } 568a4912123STheodore Ts'o } 569a4912123STheodore Ts'o if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { 570a4912123STheodore Ts'o retry = 1; 571a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 572a4912123STheodore Ts'o goto try_again; 573a4912123STheodore Ts'o } 574a4912123STheodore Ts'o /* 575a4912123STheodore Ts'o * If this didn't work, use the Orlov search algorithm 576a4912123STheodore Ts'o * to find a new flex group; we pass in the mode to 577a4912123STheodore Ts'o * avoid the topdir algorithms. 578a4912123STheodore Ts'o */ 579a4912123STheodore Ts'o *group = parent_group + flex_size; 580a4912123STheodore Ts'o if (*group > ngroups) 581a4912123STheodore Ts'o *group = 0; 5827dc57615SPeter Huewe return find_group_orlov(sb, parent, group, mode, NULL); 583a4912123STheodore Ts'o } 584ac27a0ecSDave Kleikamp 585ac27a0ecSDave Kleikamp /* 586ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 587ac27a0ecSDave Kleikamp */ 5882aa9fc4cSAvantika Mathur *group = parent_group; 5892aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 590560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 591021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 5922aa9fc4cSAvantika Mathur return 0; 593ac27a0ecSDave Kleikamp 594ac27a0ecSDave Kleikamp /* 595ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 596ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 597ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 598ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 599ac27a0ecSDave Kleikamp * different blockgroup. 600ac27a0ecSDave Kleikamp * 601ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 602ac27a0ecSDave Kleikamp */ 6032aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 604ac27a0ecSDave Kleikamp 605ac27a0ecSDave Kleikamp /* 606ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 607ac27a0ecSDave Kleikamp * blocks. 608ac27a0ecSDave Kleikamp */ 609ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 6102aa9fc4cSAvantika Mathur *group += i; 6112aa9fc4cSAvantika Mathur if (*group >= ngroups) 6122aa9fc4cSAvantika Mathur *group -= ngroups; 6132aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 614560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 615021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 6162aa9fc4cSAvantika Mathur return 0; 617ac27a0ecSDave Kleikamp } 618ac27a0ecSDave Kleikamp 619ac27a0ecSDave Kleikamp /* 620ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 621ac27a0ecSDave Kleikamp * has no free blocks. 622ac27a0ecSDave Kleikamp */ 6232aa9fc4cSAvantika Mathur *group = parent_group; 624ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 6252aa9fc4cSAvantika Mathur if (++*group >= ngroups) 6262aa9fc4cSAvantika Mathur *group = 0; 6272aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 628560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc)) 6292aa9fc4cSAvantika Mathur return 0; 630ac27a0ecSDave Kleikamp } 631ac27a0ecSDave Kleikamp 632ac27a0ecSDave Kleikamp return -1; 633ac27a0ecSDave Kleikamp } 634ac27a0ecSDave Kleikamp 635ac27a0ecSDave Kleikamp /* 63619883bd9STheodore Ts'o * In no journal mode, if an inode has recently been deleted, we want 63719883bd9STheodore Ts'o * to avoid reusing it until we're reasonably sure the inode table 63819883bd9STheodore Ts'o * block has been written back to disk. (Yes, these values are 63919883bd9STheodore Ts'o * somewhat arbitrary...) 64019883bd9STheodore Ts'o */ 64119883bd9STheodore Ts'o #define RECENTCY_MIN 5 64219883bd9STheodore Ts'o #define RECENTCY_DIRTY 30 64319883bd9STheodore Ts'o 64419883bd9STheodore Ts'o static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino) 64519883bd9STheodore Ts'o { 64619883bd9STheodore Ts'o struct ext4_group_desc *gdp; 64719883bd9STheodore Ts'o struct ext4_inode *raw_inode; 64819883bd9STheodore Ts'o struct buffer_head *bh; 64919883bd9STheodore Ts'o unsigned long dtime, now; 65019883bd9STheodore Ts'o int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; 65119883bd9STheodore Ts'o int offset, ret = 0, recentcy = RECENTCY_MIN; 65219883bd9STheodore Ts'o 65319883bd9STheodore Ts'o gdp = ext4_get_group_desc(sb, group, NULL); 65419883bd9STheodore Ts'o if (unlikely(!gdp)) 65519883bd9STheodore Ts'o return 0; 65619883bd9STheodore Ts'o 65719883bd9STheodore Ts'o bh = sb_getblk(sb, ext4_inode_table(sb, gdp) + 65819883bd9STheodore Ts'o (ino / inodes_per_block)); 65919883bd9STheodore Ts'o if (unlikely(!bh) || !buffer_uptodate(bh)) 66019883bd9STheodore Ts'o /* 66119883bd9STheodore Ts'o * If the block is not in the buffer cache, then it 66219883bd9STheodore Ts'o * must have been written out. 66319883bd9STheodore Ts'o */ 66419883bd9STheodore Ts'o goto out; 66519883bd9STheodore Ts'o 66619883bd9STheodore Ts'o offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb); 66719883bd9STheodore Ts'o raw_inode = (struct ext4_inode *) (bh->b_data + offset); 66819883bd9STheodore Ts'o dtime = le32_to_cpu(raw_inode->i_dtime); 66919883bd9STheodore Ts'o now = get_seconds(); 67019883bd9STheodore Ts'o if (buffer_dirty(bh)) 67119883bd9STheodore Ts'o recentcy += RECENTCY_DIRTY; 67219883bd9STheodore Ts'o 67319883bd9STheodore Ts'o if (dtime && (dtime < now) && (now < dtime + recentcy)) 67419883bd9STheodore Ts'o ret = 1; 67519883bd9STheodore Ts'o out: 67619883bd9STheodore Ts'o brelse(bh); 67719883bd9STheodore Ts'o return ret; 67819883bd9STheodore Ts'o } 67919883bd9STheodore Ts'o 68019883bd9STheodore Ts'o /* 681ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 682ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 683ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 684ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 685ac27a0ecSDave Kleikamp * directories already is chosen. 686ac27a0ecSDave Kleikamp * 687ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 688ac27a0ecSDave Kleikamp * group to find a free inode. 689ac27a0ecSDave Kleikamp */ 6901139575aSTheodore Ts'o struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, 6911139575aSTheodore Ts'o umode_t mode, const struct qstr *qstr, 6921139575aSTheodore Ts'o __u32 goal, uid_t *owner, int handle_type, 6931139575aSTheodore Ts'o unsigned int line_no, int nblocks) 694ac27a0ecSDave Kleikamp { 695ac27a0ecSDave Kleikamp struct super_block *sb; 6963300bedaSAneesh Kumar K.V struct buffer_head *inode_bitmap_bh = NULL; 6973300bedaSAneesh Kumar K.V struct buffer_head *group_desc_bh; 6988df9675fSTheodore Ts'o ext4_group_t ngroups, group = 0; 699ac27a0ecSDave Kleikamp unsigned long ino = 0; 700ac27a0ecSDave Kleikamp struct inode *inode; 701617ba13bSMingming Cao struct ext4_group_desc *gdp = NULL; 702617ba13bSMingming Cao struct ext4_inode_info *ei; 703617ba13bSMingming Cao struct ext4_sb_info *sbi; 70439341867SAneesh Kumar K.V int ret2, err = 0; 705ac27a0ecSDave Kleikamp struct inode *ret; 7062aa9fc4cSAvantika Mathur ext4_group_t i; 707772cb7c8SJose R. Santos ext4_group_t flex_group; 70887a39389SDarrick J. Wong struct ext4_group_info *grp; 709ac27a0ecSDave Kleikamp 710ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 711ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 712ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 713ac27a0ecSDave Kleikamp 714ac27a0ecSDave Kleikamp sb = dir->i_sb; 7158df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 7169bffad1eSTheodore Ts'o trace_ext4_request_inode(dir, mode); 717ac27a0ecSDave Kleikamp inode = new_inode(sb); 718ac27a0ecSDave Kleikamp if (!inode) 719ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 720617ba13bSMingming Cao ei = EXT4_I(inode); 721617ba13bSMingming Cao sbi = EXT4_SB(sb); 722772cb7c8SJose R. Santos 723eb9cc7e1SJan Kara /* 724eb9cc7e1SJan Kara * Initalize owners and quota early so that we don't have to account 725eb9cc7e1SJan Kara * for quota initialization worst case in standard inode creating 726eb9cc7e1SJan Kara * transaction 727eb9cc7e1SJan Kara */ 728eb9cc7e1SJan Kara if (owner) { 729eb9cc7e1SJan Kara inode->i_mode = mode; 730eb9cc7e1SJan Kara i_uid_write(inode, owner[0]); 731eb9cc7e1SJan Kara i_gid_write(inode, owner[1]); 732eb9cc7e1SJan Kara } else if (test_opt(sb, GRPID)) { 733eb9cc7e1SJan Kara inode->i_mode = mode; 734eb9cc7e1SJan Kara inode->i_uid = current_fsuid(); 735eb9cc7e1SJan Kara inode->i_gid = dir->i_gid; 736eb9cc7e1SJan Kara } else 737eb9cc7e1SJan Kara inode_init_owner(inode, dir, mode); 738eb9cc7e1SJan Kara dquot_initialize(inode); 739eb9cc7e1SJan Kara 74011013911SAndreas Dilger if (!goal) 74111013911SAndreas Dilger goal = sbi->s_inode_goal; 74211013911SAndreas Dilger 743e6462869SJohann Lombardi if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { 74411013911SAndreas Dilger group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); 74511013911SAndreas Dilger ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); 74611013911SAndreas Dilger ret2 = 0; 74711013911SAndreas Dilger goto got_group; 74811013911SAndreas Dilger } 74911013911SAndreas Dilger 7504113c4caSLukas Czerner if (S_ISDIR(mode)) 751f157a4aaSTheodore Ts'o ret2 = find_group_orlov(sb, dir, &group, mode, qstr); 7524113c4caSLukas Czerner else 753a4912123STheodore Ts'o ret2 = find_group_other(sb, dir, &group, mode); 754ac27a0ecSDave Kleikamp 755772cb7c8SJose R. Santos got_group: 756a4912123STheodore Ts'o EXT4_I(dir)->i_last_alloc_group = group; 757ac27a0ecSDave Kleikamp err = -ENOSPC; 7582aa9fc4cSAvantika Mathur if (ret2 == -1) 759ac27a0ecSDave Kleikamp goto out; 760ac27a0ecSDave Kleikamp 761119c0d44STheodore Ts'o /* 762119c0d44STheodore Ts'o * Normally we will only go through one pass of this loop, 763119c0d44STheodore Ts'o * unless we get unlucky and it turns out the group we selected 764119c0d44STheodore Ts'o * had its last inode grabbed by someone else. 765119c0d44STheodore Ts'o */ 76611013911SAndreas Dilger for (i = 0; i < ngroups; i++, ino = 0) { 767ac27a0ecSDave Kleikamp err = -EIO; 768ac27a0ecSDave Kleikamp 7693300bedaSAneesh Kumar K.V gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 770ac27a0ecSDave Kleikamp if (!gdp) 771eb9cc7e1SJan Kara goto out; 772ac27a0ecSDave Kleikamp 773f2a09af6SYongqiang Yang /* 774f2a09af6SYongqiang Yang * Check free inodes count before loading bitmap. 775f2a09af6SYongqiang Yang */ 776f2a09af6SYongqiang Yang if (ext4_free_inodes_count(sb, gdp) == 0) { 777f2a09af6SYongqiang Yang if (++group == ngroups) 778f2a09af6SYongqiang Yang group = 0; 779f2a09af6SYongqiang Yang continue; 780f2a09af6SYongqiang Yang } 781f2a09af6SYongqiang Yang 78287a39389SDarrick J. Wong grp = ext4_get_group_info(sb, group); 78387a39389SDarrick J. Wong /* Skip groups with already-known suspicious inode tables */ 78487a39389SDarrick J. Wong if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { 78587a39389SDarrick J. Wong if (++group == ngroups) 78687a39389SDarrick J. Wong group = 0; 78787a39389SDarrick J. Wong continue; 78887a39389SDarrick J. Wong } 78987a39389SDarrick J. Wong 7903300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 7913300bedaSAneesh Kumar K.V inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); 79287a39389SDarrick J. Wong /* Skip groups with suspicious inode tables */ 79387a39389SDarrick J. Wong if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) || !inode_bitmap_bh) { 79487a39389SDarrick J. Wong if (++group == ngroups) 79587a39389SDarrick J. Wong group = 0; 79687a39389SDarrick J. Wong continue; 79787a39389SDarrick J. Wong } 798ac27a0ecSDave Kleikamp 799ac27a0ecSDave Kleikamp repeat_in_this_group: 800617ba13bSMingming Cao ino = ext4_find_next_zero_bit((unsigned long *) 8013300bedaSAneesh Kumar K.V inode_bitmap_bh->b_data, 8023300bedaSAneesh Kumar K.V EXT4_INODES_PER_GROUP(sb), ino); 803a34eb503STheodore Ts'o if (ino >= EXT4_INODES_PER_GROUP(sb)) 804a34eb503STheodore Ts'o goto next_group; 805119c0d44STheodore Ts'o if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) { 806119c0d44STheodore Ts'o ext4_error(sb, "reserved inode found cleared - " 807119c0d44STheodore Ts'o "inode=%lu", ino + 1); 808119c0d44STheodore Ts'o continue; 809119c0d44STheodore Ts'o } 81019883bd9STheodore Ts'o if ((EXT4_SB(sb)->s_journal == NULL) && 81119883bd9STheodore Ts'o recently_deleted(sb, group, ino)) { 81219883bd9STheodore Ts'o ino++; 81319883bd9STheodore Ts'o goto next_inode; 81419883bd9STheodore Ts'o } 8151139575aSTheodore Ts'o if (!handle) { 8161139575aSTheodore Ts'o BUG_ON(nblocks <= 0); 8171139575aSTheodore Ts'o handle = __ext4_journal_start_sb(dir->i_sb, line_no, 8185fe2fe89SJan Kara handle_type, nblocks, 8195fe2fe89SJan Kara 0); 8201139575aSTheodore Ts'o if (IS_ERR(handle)) { 8211139575aSTheodore Ts'o err = PTR_ERR(handle); 822eb9cc7e1SJan Kara ext4_std_error(sb, err); 823eb9cc7e1SJan Kara goto out; 8241139575aSTheodore Ts'o } 8251139575aSTheodore Ts'o } 826ffb5387eSEric Sandeen BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); 827ffb5387eSEric Sandeen err = ext4_journal_get_write_access(handle, inode_bitmap_bh); 828eb9cc7e1SJan Kara if (err) { 829eb9cc7e1SJan Kara ext4_std_error(sb, err); 830eb9cc7e1SJan Kara goto out; 831eb9cc7e1SJan Kara } 832119c0d44STheodore Ts'o ext4_lock_group(sb, group); 833119c0d44STheodore Ts'o ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); 834119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 835119c0d44STheodore Ts'o ino++; /* the inode bitmap is zero-based */ 836119c0d44STheodore Ts'o if (!ret2) 837119c0d44STheodore Ts'o goto got; /* we grabbed the inode! */ 83819883bd9STheodore Ts'o next_inode: 839119c0d44STheodore Ts'o if (ino < EXT4_INODES_PER_GROUP(sb)) 840119c0d44STheodore Ts'o goto repeat_in_this_group; 841a34eb503STheodore Ts'o next_group: 842a34eb503STheodore Ts'o if (++group == ngroups) 843a34eb503STheodore Ts'o group = 0; 844ac27a0ecSDave Kleikamp } 845ac27a0ecSDave Kleikamp err = -ENOSPC; 846ac27a0ecSDave Kleikamp goto out; 847ac27a0ecSDave Kleikamp 848ac27a0ecSDave Kleikamp got: 849ffb5387eSEric Sandeen BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); 850ffb5387eSEric Sandeen err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); 851eb9cc7e1SJan Kara if (err) { 852eb9cc7e1SJan Kara ext4_std_error(sb, err); 853eb9cc7e1SJan Kara goto out; 854eb9cc7e1SJan Kara } 855ffb5387eSEric Sandeen 856717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 857feb0ab32SDarrick J. Wong if (ext4_has_group_desc_csum(sb) && 858717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 8593300bedaSAneesh Kumar K.V struct buffer_head *block_bitmap_bh; 860717d50e4SAndreas Dilger 8613300bedaSAneesh Kumar K.V block_bitmap_bh = ext4_read_block_bitmap(sb, group); 8623300bedaSAneesh Kumar K.V BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); 8633300bedaSAneesh Kumar K.V err = ext4_journal_get_write_access(handle, block_bitmap_bh); 864717d50e4SAndreas Dilger if (err) { 8653300bedaSAneesh Kumar K.V brelse(block_bitmap_bh); 866eb9cc7e1SJan Kara ext4_std_error(sb, err); 867eb9cc7e1SJan Kara goto out; 868717d50e4SAndreas Dilger } 869717d50e4SAndreas Dilger 870fd034a84STheodore Ts'o BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); 871fd034a84STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); 872fd034a84STheodore Ts'o 873717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 874fd034a84STheodore Ts'o ext4_lock_group(sb, group); 875717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 8763300bedaSAneesh Kumar K.V gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 877021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 878cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, group, gdp)); 879fa77dcfaSDarrick J. Wong ext4_block_bitmap_csum_set(sb, group, gdp, 88079f1ba49STao Ma block_bitmap_bh); 881feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 882717d50e4SAndreas Dilger } 883955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, group); 884aeb1e5d6STheodore Ts'o brelse(block_bitmap_bh); 885717d50e4SAndreas Dilger 886eb9cc7e1SJan Kara if (err) { 887eb9cc7e1SJan Kara ext4_std_error(sb, err); 888eb9cc7e1SJan Kara goto out; 889eb9cc7e1SJan Kara } 890717d50e4SAndreas Dilger } 891119c0d44STheodore Ts'o 892119c0d44STheodore Ts'o BUFFER_TRACE(group_desc_bh, "get_write_access"); 893119c0d44STheodore Ts'o err = ext4_journal_get_write_access(handle, group_desc_bh); 894eb9cc7e1SJan Kara if (err) { 895eb9cc7e1SJan Kara ext4_std_error(sb, err); 896eb9cc7e1SJan Kara goto out; 897eb9cc7e1SJan Kara } 898119c0d44STheodore Ts'o 899119c0d44STheodore Ts'o /* Update the relevant bg descriptor fields */ 90041a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 901119c0d44STheodore Ts'o int free; 902119c0d44STheodore Ts'o struct ext4_group_info *grp = ext4_get_group_info(sb, group); 903119c0d44STheodore Ts'o 904119c0d44STheodore Ts'o down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ 905119c0d44STheodore Ts'o ext4_lock_group(sb, group); /* while we modify the bg desc */ 906119c0d44STheodore Ts'o free = EXT4_INODES_PER_GROUP(sb) - 907119c0d44STheodore Ts'o ext4_itable_unused_count(sb, gdp); 908119c0d44STheodore Ts'o if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 909119c0d44STheodore Ts'o gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 910119c0d44STheodore Ts'o free = 0; 911119c0d44STheodore Ts'o } 912119c0d44STheodore Ts'o /* 913119c0d44STheodore Ts'o * Check the relative inode number against the last used 914119c0d44STheodore Ts'o * relative inode number in this group. if it is greater 915119c0d44STheodore Ts'o * we need to update the bg_itable_unused count 916119c0d44STheodore Ts'o */ 917119c0d44STheodore Ts'o if (ino > free) 918119c0d44STheodore Ts'o ext4_itable_unused_set(sb, gdp, 919119c0d44STheodore Ts'o (EXT4_INODES_PER_GROUP(sb) - ino)); 920119c0d44STheodore Ts'o up_read(&grp->alloc_sem); 9216f2e9f0eSTao Ma } else { 9226f2e9f0eSTao Ma ext4_lock_group(sb, group); 923119c0d44STheodore Ts'o } 9246f2e9f0eSTao Ma 925119c0d44STheodore Ts'o ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); 926119c0d44STheodore Ts'o if (S_ISDIR(mode)) { 927119c0d44STheodore Ts'o ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); 928119c0d44STheodore Ts'o if (sbi->s_log_groups_per_flex) { 929119c0d44STheodore Ts'o ext4_group_t f = ext4_flex_group(sbi, group); 930119c0d44STheodore Ts'o 931119c0d44STheodore Ts'o atomic_inc(&sbi->s_flex_groups[f].used_dirs); 932119c0d44STheodore Ts'o } 933119c0d44STheodore Ts'o } 93441a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 93541a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, 93641a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 937feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 938119c0d44STheodore Ts'o } 9396f2e9f0eSTao Ma ext4_unlock_group(sb, group); 940119c0d44STheodore Ts'o 9413300bedaSAneesh Kumar K.V BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); 9423300bedaSAneesh Kumar K.V err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); 943eb9cc7e1SJan Kara if (err) { 944eb9cc7e1SJan Kara ext4_std_error(sb, err); 945eb9cc7e1SJan Kara goto out; 946eb9cc7e1SJan Kara } 947ac27a0ecSDave Kleikamp 948ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 949ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 950ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 951ac27a0ecSDave Kleikamp 952772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 953772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 9549f24e420STheodore Ts'o atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); 955772cb7c8SJose R. Santos } 956ac27a0ecSDave Kleikamp 957717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 958ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 959ac27a0ecSDave Kleikamp inode->i_blocks = 0; 960ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 961ef7f3835SKalpak Shah ext4_current_time(inode); 962ac27a0ecSDave Kleikamp 963ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 964ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 965ac27a0ecSDave Kleikamp ei->i_disksize = 0; 966ac27a0ecSDave Kleikamp 9674af83508SEryu Guan /* Don't inherit extent flag from directory, amongst others. */ 9682dc6b0d4SDuane Griffin ei->i_flags = 9692dc6b0d4SDuane Griffin ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); 970ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 971ac27a0ecSDave Kleikamp ei->i_dtime = 0; 972ac27a0ecSDave Kleikamp ei->i_block_group = group; 973a4912123STheodore Ts'o ei->i_last_alloc_group = ~0; 974ac27a0ecSDave Kleikamp 975617ba13bSMingming Cao ext4_set_inode_flags(inode); 976ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 9770390131bSFrank Mayhar ext4_handle_sync(handle); 9786b38e842SAl Viro if (insert_inode_locked(inode) < 0) { 979acd6ad83SJan Kara /* 980acd6ad83SJan Kara * Likely a bitmap corruption causing inode to be allocated 981acd6ad83SJan Kara * twice. 982acd6ad83SJan Kara */ 983acd6ad83SJan Kara err = -EIO; 984eb9cc7e1SJan Kara ext4_error(sb, "failed to insert inode %lu: doubly allocated?", 985eb9cc7e1SJan Kara inode->i_ino); 986eb9cc7e1SJan Kara goto out; 9876b38e842SAl Viro } 988ac27a0ecSDave Kleikamp spin_lock(&sbi->s_next_gen_lock); 989ac27a0ecSDave Kleikamp inode->i_generation = sbi->s_next_generation++; 990ac27a0ecSDave Kleikamp spin_unlock(&sbi->s_next_gen_lock); 991ac27a0ecSDave Kleikamp 992814525f4SDarrick J. Wong /* Precompute checksum seed for inode metadata */ 993814525f4SDarrick J. Wong if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 994814525f4SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { 995814525f4SDarrick J. Wong __u32 csum; 996814525f4SDarrick J. Wong __le32 inum = cpu_to_le32(inode->i_ino); 997814525f4SDarrick J. Wong __le32 gen = cpu_to_le32(inode->i_generation); 998814525f4SDarrick J. Wong csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, 999814525f4SDarrick J. Wong sizeof(inum)); 1000814525f4SDarrick J. Wong ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, 1001814525f4SDarrick J. Wong sizeof(gen)); 1002814525f4SDarrick J. Wong } 1003814525f4SDarrick J. Wong 1004353eb83cSTheodore Ts'o ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ 100519f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NEW); 1006ef7f3835SKalpak Shah 1007ef7f3835SKalpak Shah ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; 1008ac27a0ecSDave Kleikamp 1009f08225d1STao Ma ei->i_inline_off = 0; 1010f08225d1STao Ma if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_INLINE_DATA)) 1011f08225d1STao Ma ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); 1012f08225d1STao Ma 1013ac27a0ecSDave Kleikamp ret = inode; 101463936ddaSChristoph Hellwig err = dquot_alloc_inode(inode); 101563936ddaSChristoph Hellwig if (err) 1016ac27a0ecSDave Kleikamp goto fail_drop; 1017ac27a0ecSDave Kleikamp 1018617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 1019ac27a0ecSDave Kleikamp if (err) 1020ac27a0ecSDave Kleikamp goto fail_free_drop; 1021ac27a0ecSDave Kleikamp 10222a7dba39SEric Paris err = ext4_init_security(handle, inode, dir, qstr); 1023ac27a0ecSDave Kleikamp if (err) 1024ac27a0ecSDave Kleikamp goto fail_free_drop; 1025ac27a0ecSDave Kleikamp 102683982b6fSTheodore Ts'o if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 1027e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 1028e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 102912e9b892SDmitry Monakhov ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); 1030a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 1031a86c6181SAlex Tomas } 103242bf0383SAneesh Kumar K.V } 1033ac27a0ecSDave Kleikamp 1034688f869cSTheodore Ts'o if (ext4_handle_valid(handle)) { 1035688f869cSTheodore Ts'o ei->i_sync_tid = handle->h_transaction->t_tid; 1036688f869cSTheodore Ts'o ei->i_datasync_tid = handle->h_transaction->t_tid; 1037688f869cSTheodore Ts'o } 1038688f869cSTheodore Ts'o 10398753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 10408753e88fSAneesh Kumar K.V if (err) { 10418753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 10428753e88fSAneesh Kumar K.V goto fail_free_drop; 10438753e88fSAneesh Kumar K.V } 10448753e88fSAneesh Kumar K.V 1045617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 10469bffad1eSTheodore Ts'o trace_ext4_allocate_inode(inode, dir, mode); 10473300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 1048ac27a0ecSDave Kleikamp return ret; 1049ac27a0ecSDave Kleikamp 1050ac27a0ecSDave Kleikamp fail_free_drop: 105163936ddaSChristoph Hellwig dquot_free_inode(inode); 1052ac27a0ecSDave Kleikamp fail_drop: 10536d6b77f1SMiklos Szeredi clear_nlink(inode); 10546b38e842SAl Viro unlock_new_inode(inode); 1055eb9cc7e1SJan Kara out: 1056eb9cc7e1SJan Kara dquot_drop(inode); 1057eb9cc7e1SJan Kara inode->i_flags |= S_NOQUOTA; 1058ac27a0ecSDave Kleikamp iput(inode); 10593300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 1060ac27a0ecSDave Kleikamp return ERR_PTR(err); 1061ac27a0ecSDave Kleikamp } 1062ac27a0ecSDave Kleikamp 1063ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 1064617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 1065ac27a0ecSDave Kleikamp { 1066617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 1067fd2d4291SAvantika Mathur ext4_group_t block_group; 1068ac27a0ecSDave Kleikamp int bit; 10691d1fe1eeSDavid Howells struct buffer_head *bitmap_bh; 1070ac27a0ecSDave Kleikamp struct inode *inode = NULL; 10711d1fe1eeSDavid Howells long err = -EIO; 1072ac27a0ecSDave Kleikamp 1073ac27a0ecSDave Kleikamp /* Error cases - e2fsck has already cleaned up for us */ 1074ac27a0ecSDave Kleikamp if (ino > max_ino) { 107512062dddSEric Sandeen ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino); 10761d1fe1eeSDavid Howells goto error; 1077ac27a0ecSDave Kleikamp } 1078ac27a0ecSDave Kleikamp 1079617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 1080617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 1081e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 1082ac27a0ecSDave Kleikamp if (!bitmap_bh) { 108312062dddSEric Sandeen ext4_warning(sb, "inode bitmap error for orphan %lu", ino); 10841d1fe1eeSDavid Howells goto error; 1085ac27a0ecSDave Kleikamp } 1086ac27a0ecSDave Kleikamp 1087ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 1088ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 1089ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 1090ac27a0ecSDave Kleikamp */ 10911d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 10921d1fe1eeSDavid Howells goto bad_orphan; 10931d1fe1eeSDavid Howells 10941d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 10951d1fe1eeSDavid Howells if (IS_ERR(inode)) 10961d1fe1eeSDavid Howells goto iget_failed; 10971d1fe1eeSDavid Howells 109891ef4cafSDuane Griffin /* 109991ef4cafSDuane Griffin * If the orphans has i_nlinks > 0 then it should be able to be 110091ef4cafSDuane Griffin * truncated, otherwise it won't be removed from the orphan list 110191ef4cafSDuane Griffin * during processing and an infinite loop will result. 110291ef4cafSDuane Griffin */ 110391ef4cafSDuane Griffin if (inode->i_nlink && !ext4_can_truncate(inode)) 110491ef4cafSDuane Griffin goto bad_orphan; 110591ef4cafSDuane Griffin 11061d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 11071d1fe1eeSDavid Howells goto bad_orphan; 11081d1fe1eeSDavid Howells brelse(bitmap_bh); 11091d1fe1eeSDavid Howells return inode; 11101d1fe1eeSDavid Howells 11111d1fe1eeSDavid Howells iget_failed: 11121d1fe1eeSDavid Howells err = PTR_ERR(inode); 11131d1fe1eeSDavid Howells inode = NULL; 11141d1fe1eeSDavid Howells bad_orphan: 111512062dddSEric Sandeen ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino); 11168de5c325STheodore Ts'o printk(KERN_WARNING "ext4_test_bit(bit=%d, block=%llu) = %d\n", 1117ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 1118617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 11198de5c325STheodore Ts'o printk(KERN_WARNING "inode=%p\n", inode); 1120ac27a0ecSDave Kleikamp if (inode) { 11218de5c325STheodore Ts'o printk(KERN_WARNING "is_bad_inode(inode)=%d\n", 1122ac27a0ecSDave Kleikamp is_bad_inode(inode)); 11238de5c325STheodore Ts'o printk(KERN_WARNING "NEXT_ORPHAN(inode)=%u\n", 1124ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 11258de5c325STheodore Ts'o printk(KERN_WARNING "max_ino=%lu\n", max_ino); 11268de5c325STheodore Ts'o printk(KERN_WARNING "i_nlink=%u\n", inode->i_nlink); 1127ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 11281d1fe1eeSDavid Howells if (inode->i_nlink == 0) 1129ac27a0ecSDave Kleikamp inode->i_blocks = 0; 1130ac27a0ecSDave Kleikamp iput(inode); 1131ac27a0ecSDave Kleikamp } 1132ac27a0ecSDave Kleikamp brelse(bitmap_bh); 11331d1fe1eeSDavid Howells error: 11341d1fe1eeSDavid Howells return ERR_PTR(err); 1135ac27a0ecSDave Kleikamp } 1136ac27a0ecSDave Kleikamp 1137617ba13bSMingming Cao unsigned long ext4_count_free_inodes(struct super_block *sb) 1138ac27a0ecSDave Kleikamp { 1139ac27a0ecSDave Kleikamp unsigned long desc_count; 1140617ba13bSMingming Cao struct ext4_group_desc *gdp; 11418df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1142617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 1143617ba13bSMingming Cao struct ext4_super_block *es; 1144ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 1145ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 1146ac27a0ecSDave Kleikamp 1147617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 1148ac27a0ecSDave Kleikamp desc_count = 0; 1149ac27a0ecSDave Kleikamp bitmap_count = 0; 1150ac27a0ecSDave Kleikamp gdp = NULL; 11518df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1152617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1153ac27a0ecSDave Kleikamp if (!gdp) 1154ac27a0ecSDave Kleikamp continue; 1155560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1156ac27a0ecSDave Kleikamp brelse(bitmap_bh); 1157e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 1158ac27a0ecSDave Kleikamp if (!bitmap_bh) 1159ac27a0ecSDave Kleikamp continue; 1160ac27a0ecSDave Kleikamp 1161f6fb99caSTheodore Ts'o x = ext4_count_free(bitmap_bh->b_data, 1162f6fb99caSTheodore Ts'o EXT4_INODES_PER_GROUP(sb) / 8); 1163c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 1164785b4b3aSPeng Tao (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); 1165ac27a0ecSDave Kleikamp bitmap_count += x; 1166ac27a0ecSDave Kleikamp } 1167ac27a0ecSDave Kleikamp brelse(bitmap_bh); 11684776004fSTheodore Ts'o printk(KERN_DEBUG "ext4_count_free_inodes: " 11694776004fSTheodore Ts'o "stored = %u, computed = %lu, %lu\n", 1170ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 1171ac27a0ecSDave Kleikamp return desc_count; 1172ac27a0ecSDave Kleikamp #else 1173ac27a0ecSDave Kleikamp desc_count = 0; 11748df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1175617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1176ac27a0ecSDave Kleikamp if (!gdp) 1177ac27a0ecSDave Kleikamp continue; 1178560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1179ac27a0ecSDave Kleikamp cond_resched(); 1180ac27a0ecSDave Kleikamp } 1181ac27a0ecSDave Kleikamp return desc_count; 1182ac27a0ecSDave Kleikamp #endif 1183ac27a0ecSDave Kleikamp } 1184ac27a0ecSDave Kleikamp 1185ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1186617ba13bSMingming Cao unsigned long ext4_count_dirs(struct super_block * sb) 1187ac27a0ecSDave Kleikamp { 1188ac27a0ecSDave Kleikamp unsigned long count = 0; 11898df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1190ac27a0ecSDave Kleikamp 11918df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1192617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1193ac27a0ecSDave Kleikamp if (!gdp) 1194ac27a0ecSDave Kleikamp continue; 1195560671a0SAneesh Kumar K.V count += ext4_used_dirs_count(sb, gdp); 1196ac27a0ecSDave Kleikamp } 1197ac27a0ecSDave Kleikamp return count; 1198ac27a0ecSDave Kleikamp } 1199bfff6873SLukas Czerner 1200bfff6873SLukas Czerner /* 1201bfff6873SLukas Czerner * Zeroes not yet zeroed inode table - just write zeroes through the whole 1202bfff6873SLukas Czerner * inode table. Must be called without any spinlock held. The only place 1203bfff6873SLukas Czerner * where it is called from on active part of filesystem is ext4lazyinit 1204bfff6873SLukas Czerner * thread, so we do not need any special locks, however we have to prevent 1205bfff6873SLukas Czerner * inode allocation from the current group, so we take alloc_sem lock, to 1206119c0d44STheodore Ts'o * block ext4_new_inode() until we are finished. 1207bfff6873SLukas Czerner */ 1208e0cbee3eSH Hartley Sweeten int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, 1209bfff6873SLukas Czerner int barrier) 1210bfff6873SLukas Czerner { 1211bfff6873SLukas Czerner struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1212bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 1213bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 1214bfff6873SLukas Czerner struct buffer_head *group_desc_bh; 1215bfff6873SLukas Czerner handle_t *handle; 1216bfff6873SLukas Czerner ext4_fsblk_t blk; 1217bfff6873SLukas Czerner int num, ret = 0, used_blks = 0; 1218bfff6873SLukas Czerner 1219bfff6873SLukas Czerner /* This should not happen, but just to be sure check this */ 1220bfff6873SLukas Czerner if (sb->s_flags & MS_RDONLY) { 1221bfff6873SLukas Czerner ret = 1; 1222bfff6873SLukas Czerner goto out; 1223bfff6873SLukas Czerner } 1224bfff6873SLukas Czerner 1225bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 1226bfff6873SLukas Czerner if (!gdp) 1227bfff6873SLukas Czerner goto out; 1228bfff6873SLukas Czerner 1229bfff6873SLukas Czerner /* 1230bfff6873SLukas Czerner * We do not need to lock this, because we are the only one 1231bfff6873SLukas Czerner * handling this flag. 1232bfff6873SLukas Czerner */ 1233bfff6873SLukas Czerner if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) 1234bfff6873SLukas Czerner goto out; 1235bfff6873SLukas Czerner 12369924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); 1237bfff6873SLukas Czerner if (IS_ERR(handle)) { 1238bfff6873SLukas Czerner ret = PTR_ERR(handle); 1239bfff6873SLukas Czerner goto out; 1240bfff6873SLukas Czerner } 1241bfff6873SLukas Czerner 1242bfff6873SLukas Czerner down_write(&grp->alloc_sem); 1243bfff6873SLukas Czerner /* 1244bfff6873SLukas Czerner * If inode bitmap was already initialized there may be some 1245bfff6873SLukas Czerner * used inodes so we need to skip blocks with used inodes in 1246bfff6873SLukas Czerner * inode table. 1247bfff6873SLukas Czerner */ 1248bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) 1249bfff6873SLukas Czerner used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - 1250bfff6873SLukas Czerner ext4_itable_unused_count(sb, gdp)), 1251bfff6873SLukas Czerner sbi->s_inodes_per_block); 1252bfff6873SLukas Czerner 1253857ac889SLukas Czerner if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { 12541084f252STheodore Ts'o ext4_error(sb, "Something is wrong with group %u: " 12551084f252STheodore Ts'o "used itable blocks: %d; " 12561084f252STheodore Ts'o "itable unused count: %u", 1257857ac889SLukas Czerner group, used_blks, 1258857ac889SLukas Czerner ext4_itable_unused_count(sb, gdp)); 1259857ac889SLukas Czerner ret = 1; 126033853a0dSYongqiang Yang goto err_out; 1261857ac889SLukas Czerner } 1262857ac889SLukas Czerner 1263bfff6873SLukas Czerner blk = ext4_inode_table(sb, gdp) + used_blks; 1264bfff6873SLukas Czerner num = sbi->s_itb_per_group - used_blks; 1265bfff6873SLukas Czerner 1266bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, "get_write_access"); 1267bfff6873SLukas Czerner ret = ext4_journal_get_write_access(handle, 1268bfff6873SLukas Czerner group_desc_bh); 1269bfff6873SLukas Czerner if (ret) 1270bfff6873SLukas Czerner goto err_out; 1271bfff6873SLukas Czerner 1272bfff6873SLukas Czerner /* 1273bfff6873SLukas Czerner * Skip zeroout if the inode table is full. But we set the ZEROED 1274bfff6873SLukas Czerner * flag anyway, because obviously, when it is full it does not need 1275bfff6873SLukas Czerner * further zeroing. 1276bfff6873SLukas Czerner */ 1277bfff6873SLukas Czerner if (unlikely(num == 0)) 1278bfff6873SLukas Czerner goto skip_zeroout; 1279bfff6873SLukas Czerner 1280bfff6873SLukas Czerner ext4_debug("going to zero out inode table in group %d\n", 1281bfff6873SLukas Czerner group); 1282a107e5a3STheodore Ts'o ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); 1283bfff6873SLukas Czerner if (ret < 0) 1284bfff6873SLukas Czerner goto err_out; 1285a107e5a3STheodore Ts'o if (barrier) 1286a107e5a3STheodore Ts'o blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); 1287bfff6873SLukas Czerner 1288bfff6873SLukas Czerner skip_zeroout: 1289bfff6873SLukas Czerner ext4_lock_group(sb, group); 1290bfff6873SLukas Czerner gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); 1291feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1292bfff6873SLukas Czerner ext4_unlock_group(sb, group); 1293bfff6873SLukas Czerner 1294bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, 1295bfff6873SLukas Czerner "call ext4_handle_dirty_metadata"); 1296bfff6873SLukas Czerner ret = ext4_handle_dirty_metadata(handle, NULL, 1297bfff6873SLukas Czerner group_desc_bh); 1298bfff6873SLukas Czerner 1299bfff6873SLukas Czerner err_out: 1300bfff6873SLukas Czerner up_write(&grp->alloc_sem); 1301bfff6873SLukas Czerner ext4_journal_stop(handle); 1302bfff6873SLukas Czerner out: 1303bfff6873SLukas Czerner return ret; 1304bfff6873SLukas Czerner } 1305