1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/ialloc.c 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 6ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 7ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 8ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 9ac27a0ecSDave Kleikamp * 10ac27a0ecSDave Kleikamp * BSD ufs-inspired inode and directory allocation by 11ac27a0ecSDave Kleikamp * Stephen Tweedie (sct@redhat.com), 1993 12ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 13ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 14ac27a0ecSDave Kleikamp */ 15ac27a0ecSDave Kleikamp 16ac27a0ecSDave Kleikamp #include <linux/time.h> 17ac27a0ecSDave Kleikamp #include <linux/fs.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> 255b825c3aSIngo Molnar #include <linux/cred.h> 265b825c3aSIngo Molnar 27ac27a0ecSDave Kleikamp #include <asm/byteorder.h> 289bffad1eSTheodore Ts'o 293dcf5451SChristoph Hellwig #include "ext4.h" 303dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 31ac27a0ecSDave Kleikamp #include "xattr.h" 32ac27a0ecSDave Kleikamp #include "acl.h" 33ac27a0ecSDave Kleikamp 349bffad1eSTheodore Ts'o #include <trace/events/ext4.h> 359bffad1eSTheodore Ts'o 36ac27a0ecSDave Kleikamp /* 37ac27a0ecSDave Kleikamp * ialloc.c contains the inodes allocation and deallocation routines 38ac27a0ecSDave Kleikamp */ 39ac27a0ecSDave Kleikamp 40ac27a0ecSDave Kleikamp /* 41ac27a0ecSDave Kleikamp * The free inodes are managed by bitmaps. A file system contains several 42ac27a0ecSDave Kleikamp * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap 43ac27a0ecSDave Kleikamp * block for inodes, N blocks for the inode table and data blocks. 44ac27a0ecSDave Kleikamp * 45ac27a0ecSDave Kleikamp * The file system contains group descriptors which are located after the 46ac27a0ecSDave Kleikamp * super block. Each descriptor contains the number of the bitmap block and 47ac27a0ecSDave Kleikamp * the free blocks count in the block. 48ac27a0ecSDave Kleikamp */ 49ac27a0ecSDave Kleikamp 50717d50e4SAndreas Dilger /* 51717d50e4SAndreas Dilger * To avoid calling the atomic setbit hundreds or thousands of times, we only 52717d50e4SAndreas Dilger * need to use it within a single byte (to ensure we get endianness right). 53717d50e4SAndreas Dilger * We can use memset for the rest of the bitmap as there are no other users. 54717d50e4SAndreas Dilger */ 5561d08673STheodore Ts'o void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) 56717d50e4SAndreas Dilger { 57717d50e4SAndreas Dilger int i; 58717d50e4SAndreas Dilger 59717d50e4SAndreas Dilger if (start_bit >= end_bit) 60717d50e4SAndreas Dilger return; 61717d50e4SAndreas Dilger 62717d50e4SAndreas Dilger ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); 63717d50e4SAndreas Dilger for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) 64717d50e4SAndreas Dilger ext4_set_bit(i, bitmap); 65717d50e4SAndreas Dilger if (i < end_bit) 66717d50e4SAndreas Dilger memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); 67717d50e4SAndreas Dilger } 68717d50e4SAndreas Dilger 69813e5727STheodore Ts'o void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) 70813e5727STheodore Ts'o { 71813e5727STheodore Ts'o if (uptodate) { 72813e5727STheodore Ts'o set_buffer_uptodate(bh); 73813e5727STheodore Ts'o set_bitmap_uptodate(bh); 74813e5727STheodore Ts'o } 75813e5727STheodore Ts'o unlock_buffer(bh); 76813e5727STheodore Ts'o put_bh(bh); 77813e5727STheodore Ts'o } 78813e5727STheodore Ts'o 799008a58eSDarrick J. Wong static int ext4_validate_inode_bitmap(struct super_block *sb, 809008a58eSDarrick J. Wong struct ext4_group_desc *desc, 819008a58eSDarrick J. Wong ext4_group_t block_group, 829008a58eSDarrick J. Wong struct buffer_head *bh) 839008a58eSDarrick J. Wong { 849008a58eSDarrick J. Wong ext4_fsblk_t blk; 859008a58eSDarrick J. Wong struct ext4_group_info *grp = ext4_get_group_info(sb, block_group); 869008a58eSDarrick J. Wong 879008a58eSDarrick J. Wong if (buffer_verified(bh)) 889008a58eSDarrick J. Wong return 0; 899008a58eSDarrick J. Wong if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) 909008a58eSDarrick J. Wong return -EFSCORRUPTED; 919008a58eSDarrick J. Wong 929008a58eSDarrick J. Wong ext4_lock_group(sb, block_group); 939008a58eSDarrick J. Wong blk = ext4_inode_bitmap(sb, desc); 949008a58eSDarrick J. Wong if (!ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, 959008a58eSDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8)) { 969008a58eSDarrick J. Wong ext4_unlock_group(sb, block_group); 979008a58eSDarrick J. Wong ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " 989008a58eSDarrick J. Wong "inode_bitmap = %llu", block_group, blk); 99db79e6d1SWang Shilong ext4_mark_group_bitmap_corrupted(sb, block_group, 100db79e6d1SWang Shilong EXT4_GROUP_INFO_IBITMAP_CORRUPT); 1019008a58eSDarrick J. Wong return -EFSBADCRC; 1029008a58eSDarrick J. Wong } 1039008a58eSDarrick J. Wong set_buffer_verified(bh); 1049008a58eSDarrick J. Wong ext4_unlock_group(sb, block_group); 1059008a58eSDarrick J. Wong return 0; 1069008a58eSDarrick J. Wong } 1079008a58eSDarrick J. Wong 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; 1187dac4a17STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 119ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 120e29d1cdeSEric Sandeen ext4_fsblk_t bitmap_blk; 1219008a58eSDarrick J. Wong int err; 122ac27a0ecSDave Kleikamp 123617ba13bSMingming Cao desc = ext4_get_group_desc(sb, block_group, NULL); 124ac27a0ecSDave Kleikamp if (!desc) 1259008a58eSDarrick J. Wong return ERR_PTR(-EFSCORRUPTED); 126bfff6873SLukas Czerner 127e29d1cdeSEric Sandeen bitmap_blk = ext4_inode_bitmap(sb, desc); 1287dac4a17STheodore Ts'o if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || 1297dac4a17STheodore Ts'o (bitmap_blk >= ext4_blocks_count(sbi->s_es))) { 1307dac4a17STheodore Ts'o ext4_error(sb, "Invalid inode bitmap blk %llu in " 1317dac4a17STheodore Ts'o "block_group %u", bitmap_blk, block_group); 1327dac4a17STheodore Ts'o return ERR_PTR(-EFSCORRUPTED); 1337dac4a17STheodore Ts'o } 134e29d1cdeSEric Sandeen bh = sb_getblk(sb, bitmap_blk); 135e29d1cdeSEric Sandeen if (unlikely(!bh)) { 13612062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 137a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 138e29d1cdeSEric Sandeen block_group, bitmap_blk); 1390db9fdebSWang Shilong return ERR_PTR(-ENOMEM); 140e29d1cdeSEric Sandeen } 1412ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) 14241a246d1SDarrick J. Wong goto verify; 143e29d1cdeSEric Sandeen 144c806e68fSFrederic Bohe lock_buffer(bh); 1452ccb5fb9SAneesh Kumar K.V if (bitmap_uptodate(bh)) { 1462ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 14741a246d1SDarrick J. Wong goto verify; 1482ccb5fb9SAneesh Kumar K.V } 149bfff6873SLukas Czerner 150955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 151e29d1cdeSEric Sandeen if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 152044e6e3dSTheodore Ts'o memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); 153044e6e3dSTheodore Ts'o ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), 154044e6e3dSTheodore Ts'o sb->s_blocksize * 8, bh->b_data); 1552ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 156e29d1cdeSEric Sandeen set_buffer_uptodate(bh); 15741a246d1SDarrick J. Wong set_buffer_verified(bh); 158955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 1593300bedaSAneesh Kumar K.V unlock_buffer(bh); 160e29d1cdeSEric Sandeen return bh; 161e29d1cdeSEric Sandeen } 162955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 163bfff6873SLukas Czerner 1642ccb5fb9SAneesh Kumar K.V if (buffer_uptodate(bh)) { 1652ccb5fb9SAneesh Kumar K.V /* 1662ccb5fb9SAneesh Kumar K.V * if not uninit if bh is uptodate, 1672ccb5fb9SAneesh Kumar K.V * bitmap is also uptodate 1682ccb5fb9SAneesh Kumar K.V */ 1692ccb5fb9SAneesh Kumar K.V set_bitmap_uptodate(bh); 1702ccb5fb9SAneesh Kumar K.V unlock_buffer(bh); 17141a246d1SDarrick J. Wong goto verify; 1722ccb5fb9SAneesh Kumar K.V } 1732ccb5fb9SAneesh Kumar K.V /* 174813e5727STheodore Ts'o * submit the buffer_head for reading 1752ccb5fb9SAneesh Kumar K.V */ 1760562e0baSJiaying Zhang trace_ext4_load_inode_bitmap(sb, block_group); 177813e5727STheodore Ts'o bh->b_end_io = ext4_end_bitmap_read; 178813e5727STheodore Ts'o get_bh(bh); 1792a222ca9SMike Christie submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh); 180813e5727STheodore Ts'o wait_on_buffer(bh); 181813e5727STheodore Ts'o if (!buffer_uptodate(bh)) { 182e29d1cdeSEric Sandeen put_bh(bh); 18312062dddSEric Sandeen ext4_error(sb, "Cannot read inode bitmap - " 184a9df9a49STheodore Ts'o "block_group = %u, inode_bitmap = %llu", 185e29d1cdeSEric Sandeen block_group, bitmap_blk); 1869008a58eSDarrick J. Wong return ERR_PTR(-EIO); 187e29d1cdeSEric Sandeen } 18841a246d1SDarrick J. Wong 18941a246d1SDarrick J. Wong verify: 1909008a58eSDarrick J. Wong err = ext4_validate_inode_bitmap(sb, desc, block_group, bh); 1919008a58eSDarrick J. Wong if (err) 1929008a58eSDarrick J. Wong goto out; 193ac27a0ecSDave Kleikamp return bh; 1949008a58eSDarrick J. Wong out: 1959008a58eSDarrick J. Wong put_bh(bh); 1969008a58eSDarrick J. Wong return ERR_PTR(err); 197ac27a0ecSDave Kleikamp } 198ac27a0ecSDave Kleikamp 199ac27a0ecSDave Kleikamp /* 200ac27a0ecSDave Kleikamp * NOTE! When we get the inode, we're the only people 201ac27a0ecSDave Kleikamp * that have access to it, and as such there are no 202ac27a0ecSDave Kleikamp * race conditions we have to worry about. The inode 203ac27a0ecSDave Kleikamp * is not on the hash-lists, and it cannot be reached 204ac27a0ecSDave Kleikamp * through the filesystem because the directory entry 205ac27a0ecSDave Kleikamp * has been deleted earlier. 206ac27a0ecSDave Kleikamp * 207ac27a0ecSDave Kleikamp * HOWEVER: we must make sure that we get no aliases, 208ac27a0ecSDave Kleikamp * which means that we have to call "clear_inode()" 209ac27a0ecSDave Kleikamp * _before_ we mark the inode not in use in the inode 210ac27a0ecSDave Kleikamp * bitmaps. Otherwise a newly created file might use 211ac27a0ecSDave Kleikamp * the same inode number (not actually the same pointer 212ac27a0ecSDave Kleikamp * though), and then we'd have two inodes sharing the 213ac27a0ecSDave Kleikamp * same inode number and space on the harddisk. 214ac27a0ecSDave Kleikamp */ 215617ba13bSMingming Cao void ext4_free_inode(handle_t *handle, struct inode *inode) 216ac27a0ecSDave Kleikamp { 217ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 218ac27a0ecSDave Kleikamp int is_directory; 219ac27a0ecSDave Kleikamp unsigned long ino; 220ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 221ac27a0ecSDave Kleikamp struct buffer_head *bh2; 222fd2d4291SAvantika Mathur ext4_group_t block_group; 223ac27a0ecSDave Kleikamp unsigned long bit; 224617ba13bSMingming Cao struct ext4_group_desc *gdp; 225617ba13bSMingming Cao struct ext4_super_block *es; 226617ba13bSMingming Cao struct ext4_sb_info *sbi; 2277ce9d5d1SEric Sandeen int fatal = 0, err, count, cleared; 22887a39389SDarrick J. Wong struct ext4_group_info *grp; 229ac27a0ecSDave Kleikamp 23092b97816STheodore Ts'o if (!sb) { 23192b97816STheodore Ts'o printk(KERN_ERR "EXT4-fs: %s:%d: inode on " 23292b97816STheodore Ts'o "nonexistent device\n", __func__, __LINE__); 23392b97816STheodore Ts'o return; 23492b97816STheodore Ts'o } 235ac27a0ecSDave Kleikamp if (atomic_read(&inode->i_count) > 1) { 23692b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", 23792b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, 238ac27a0ecSDave Kleikamp atomic_read(&inode->i_count)); 239ac27a0ecSDave Kleikamp return; 240ac27a0ecSDave Kleikamp } 241ac27a0ecSDave Kleikamp if (inode->i_nlink) { 24292b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", 24392b97816STheodore Ts'o __func__, __LINE__, inode->i_ino, inode->i_nlink); 244ac27a0ecSDave Kleikamp return; 245ac27a0ecSDave Kleikamp } 246617ba13bSMingming Cao sbi = EXT4_SB(sb); 247ac27a0ecSDave Kleikamp 248ac27a0ecSDave Kleikamp ino = inode->i_ino; 249617ba13bSMingming Cao ext4_debug("freeing inode %lu\n", ino); 2509bffad1eSTheodore Ts'o trace_ext4_free_inode(inode); 251ac27a0ecSDave Kleikamp 252ac27a0ecSDave Kleikamp /* 253ac27a0ecSDave Kleikamp * Note: we must free any quota before locking the superblock, 254ac27a0ecSDave Kleikamp * as writing the quota to disk may need the lock as well. 255ac27a0ecSDave Kleikamp */ 256871a2931SChristoph Hellwig dquot_initialize(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 26549598e04SJun Piao es = sbi->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); 2759008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 2769008a58eSDarrick J. Wong fatal = PTR_ERR(bitmap_bh); 2779008a58eSDarrick J. Wong bitmap_bh = NULL; 278ac27a0ecSDave Kleikamp goto error_return; 2799008a58eSDarrick J. Wong } 2809008a58eSDarrick J. Wong if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp))) { 2819008a58eSDarrick J. Wong fatal = -EFSCORRUPTED; 2829008a58eSDarrick J. Wong goto error_return; 2839008a58eSDarrick J. Wong } 284ac27a0ecSDave Kleikamp 285ac27a0ecSDave Kleikamp BUFFER_TRACE(bitmap_bh, "get_write_access"); 286617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bitmap_bh); 287ac27a0ecSDave Kleikamp if (fatal) 288ac27a0ecSDave Kleikamp goto error_return; 289ac27a0ecSDave Kleikamp 290d17413c0SDmitry Monakhov fatal = -ESRCH; 291617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, block_group, &bh2); 292d17413c0SDmitry Monakhov if (gdp) { 293ac27a0ecSDave Kleikamp BUFFER_TRACE(bh2, "get_write_access"); 294617ba13bSMingming Cao fatal = ext4_journal_get_write_access(handle, bh2); 295d17413c0SDmitry Monakhov } 296955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 297597d508cSAkinobu Mita cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); 298d17413c0SDmitry Monakhov if (fatal || !cleared) { 299d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 300d17413c0SDmitry Monakhov goto out; 301d17413c0SDmitry Monakhov } 302d17413c0SDmitry Monakhov 303560671a0SAneesh Kumar K.V count = ext4_free_inodes_count(sb, gdp) + 1; 304560671a0SAneesh Kumar K.V ext4_free_inodes_set(sb, gdp, count); 305560671a0SAneesh Kumar K.V if (is_directory) { 306560671a0SAneesh Kumar K.V count = ext4_used_dirs_count(sb, gdp) - 1; 307560671a0SAneesh Kumar K.V ext4_used_dirs_set(sb, gdp, count); 308d17413c0SDmitry Monakhov percpu_counter_dec(&sbi->s_dirs_counter); 309d17413c0SDmitry Monakhov } 31041a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, 31141a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 312feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, block_group, gdp); 313d17413c0SDmitry Monakhov ext4_unlock_group(sb, block_group); 3147d39db14STheodore Ts'o 315d17413c0SDmitry Monakhov percpu_counter_inc(&sbi->s_freeinodes_counter); 316d17413c0SDmitry Monakhov if (sbi->s_log_groups_per_flex) { 317d17413c0SDmitry Monakhov ext4_group_t f = ext4_flex_group(sbi, block_group); 318d17413c0SDmitry Monakhov 319d17413c0SDmitry Monakhov atomic_inc(&sbi->s_flex_groups[f].free_inodes); 320d17413c0SDmitry Monakhov if (is_directory) 321c4caae25SEric Sandeen atomic_dec(&sbi->s_flex_groups[f].used_dirs); 3227d39db14STheodore Ts'o } 3230390131bSFrank Mayhar BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); 324d17413c0SDmitry Monakhov fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); 325d17413c0SDmitry Monakhov out: 326d17413c0SDmitry Monakhov if (cleared) { 3270390131bSFrank Mayhar BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); 3280390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 329ac27a0ecSDave Kleikamp if (!fatal) 330ac27a0ecSDave Kleikamp fatal = err; 33187a39389SDarrick J. Wong } else { 332d17413c0SDmitry Monakhov ext4_error(sb, "bit already cleared for inode %lu", ino); 333db79e6d1SWang Shilong ext4_mark_group_bitmap_corrupted(sb, block_group, 334db79e6d1SWang Shilong EXT4_GROUP_INFO_IBITMAP_CORRUPT); 33587a39389SDarrick J. Wong } 336d17413c0SDmitry Monakhov 337ac27a0ecSDave Kleikamp error_return: 338ac27a0ecSDave Kleikamp brelse(bitmap_bh); 339617ba13bSMingming Cao ext4_std_error(sb, fatal); 340ac27a0ecSDave Kleikamp } 341ac27a0ecSDave Kleikamp 342a4912123STheodore Ts'o struct orlov_stats { 34390ba983fSTheodore Ts'o __u64 free_clusters; 344a4912123STheodore Ts'o __u32 free_inodes; 345a4912123STheodore Ts'o __u32 used_dirs; 346a4912123STheodore Ts'o }; 347a4912123STheodore Ts'o 348a4912123STheodore Ts'o /* 349a4912123STheodore Ts'o * Helper function for Orlov's allocator; returns critical information 350a4912123STheodore Ts'o * for a particular block group or flex_bg. If flex_size is 1, then g 351a4912123STheodore Ts'o * is a block group number; otherwise it is flex_bg number. 352a4912123STheodore Ts'o */ 3531f109d5aSTheodore Ts'o static void get_orlov_stats(struct super_block *sb, ext4_group_t g, 354a4912123STheodore Ts'o int flex_size, struct orlov_stats *stats) 355a4912123STheodore Ts'o { 356a4912123STheodore Ts'o struct ext4_group_desc *desc; 3577d39db14STheodore Ts'o struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; 358a4912123STheodore Ts'o 3597d39db14STheodore Ts'o if (flex_size > 1) { 3607d39db14STheodore Ts'o stats->free_inodes = atomic_read(&flex_group[g].free_inodes); 36190ba983fSTheodore Ts'o stats->free_clusters = atomic64_read(&flex_group[g].free_clusters); 3627d39db14STheodore Ts'o stats->used_dirs = atomic_read(&flex_group[g].used_dirs); 3637d39db14STheodore Ts'o return; 3647d39db14STheodore Ts'o } 3657d39db14STheodore Ts'o 3667d39db14STheodore Ts'o desc = ext4_get_group_desc(sb, g, NULL); 3677d39db14STheodore Ts'o if (desc) { 3687d39db14STheodore Ts'o stats->free_inodes = ext4_free_inodes_count(sb, desc); 369021b65bbSTheodore Ts'o stats->free_clusters = ext4_free_group_clusters(sb, desc); 3707d39db14STheodore Ts'o stats->used_dirs = ext4_used_dirs_count(sb, desc); 3717d39db14STheodore Ts'o } else { 372a4912123STheodore Ts'o stats->free_inodes = 0; 37324aaa8efSTheodore Ts'o stats->free_clusters = 0; 374a4912123STheodore Ts'o stats->used_dirs = 0; 375a4912123STheodore Ts'o } 376a4912123STheodore Ts'o } 377a4912123STheodore Ts'o 378ac27a0ecSDave Kleikamp /* 379ac27a0ecSDave Kleikamp * Orlov's allocator for directories. 380ac27a0ecSDave Kleikamp * 381ac27a0ecSDave Kleikamp * We always try to spread first-level directories. 382ac27a0ecSDave Kleikamp * 383ac27a0ecSDave Kleikamp * If there are blockgroups with both free inodes and free blocks counts 384ac27a0ecSDave Kleikamp * not worse than average we return one with smallest directory count. 385ac27a0ecSDave Kleikamp * Otherwise we simply return a random group. 386ac27a0ecSDave Kleikamp * 387ac27a0ecSDave Kleikamp * For the rest rules look so: 388ac27a0ecSDave Kleikamp * 389ac27a0ecSDave Kleikamp * It's OK to put directory into a group unless 390ac27a0ecSDave Kleikamp * it has too many directories already (max_dirs) or 391ac27a0ecSDave Kleikamp * it has too few free inodes left (min_inodes) or 392ac27a0ecSDave Kleikamp * it has too few free blocks left (min_blocks) or 3931cc8dcf5SBenoit Boissinot * Parent's group is preferred, if it doesn't satisfy these 394ac27a0ecSDave Kleikamp * conditions we search cyclically through the rest. If none 395ac27a0ecSDave Kleikamp * of the groups look good we just look for a group with more 396ac27a0ecSDave Kleikamp * free inodes than average (starting at parent's group). 397ac27a0ecSDave Kleikamp */ 398ac27a0ecSDave Kleikamp 3992aa9fc4cSAvantika Mathur static int find_group_orlov(struct super_block *sb, struct inode *parent, 400dcca3fecSAl Viro ext4_group_t *group, umode_t mode, 401f157a4aaSTheodore Ts'o const struct qstr *qstr) 402ac27a0ecSDave Kleikamp { 403fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 404617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 4058df9675fSTheodore Ts'o ext4_group_t real_ngroups = ext4_get_groups_count(sb); 406617ba13bSMingming Cao int inodes_per_group = EXT4_INODES_PER_GROUP(sb); 40714c83c9fSTheodore Ts'o unsigned int freei, avefreei, grp_free; 40824aaa8efSTheodore Ts'o ext4_fsblk_t freeb, avefreec; 409ac27a0ecSDave Kleikamp unsigned int ndirs; 410a4912123STheodore Ts'o int max_dirs, min_inodes; 41124aaa8efSTheodore Ts'o ext4_grpblk_t min_clusters; 4128df9675fSTheodore Ts'o ext4_group_t i, grp, g, ngroups; 413617ba13bSMingming Cao struct ext4_group_desc *desc; 414a4912123STheodore Ts'o struct orlov_stats stats; 415a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(sbi); 416f157a4aaSTheodore Ts'o struct dx_hash_info hinfo; 417a4912123STheodore Ts'o 4188df9675fSTheodore Ts'o ngroups = real_ngroups; 419a4912123STheodore Ts'o if (flex_size > 1) { 4208df9675fSTheodore Ts'o ngroups = (real_ngroups + flex_size - 1) >> 421a4912123STheodore Ts'o sbi->s_log_groups_per_flex; 422a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 423a4912123STheodore Ts'o } 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); 426ac27a0ecSDave Kleikamp avefreei = freei / ngroups; 42757042651STheodore Ts'o freeb = EXT4_C2B(sbi, 42857042651STheodore Ts'o percpu_counter_read_positive(&sbi->s_freeclusters_counter)); 42924aaa8efSTheodore Ts'o avefreec = freeb; 43024aaa8efSTheodore Ts'o do_div(avefreec, ngroups); 431ac27a0ecSDave Kleikamp ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); 432ac27a0ecSDave Kleikamp 433a4912123STheodore Ts'o if (S_ISDIR(mode) && 4342b0143b5SDavid Howells ((parent == d_inode(sb->s_root)) || 43512e9b892SDmitry Monakhov (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { 436ac27a0ecSDave Kleikamp int best_ndir = inodes_per_group; 4372aa9fc4cSAvantika Mathur int ret = -1; 438ac27a0ecSDave Kleikamp 439f157a4aaSTheodore Ts'o if (qstr) { 440f157a4aaSTheodore Ts'o hinfo.hash_version = DX_HASH_HALF_MD4; 441f157a4aaSTheodore Ts'o hinfo.seed = sbi->s_hash_seed; 442f157a4aaSTheodore Ts'o ext4fs_dirhash(qstr->name, qstr->len, &hinfo); 443f157a4aaSTheodore Ts'o grp = hinfo.hash; 444f157a4aaSTheodore Ts'o } else 445dd1f723bSTheodore Ts'o grp = prandom_u32(); 4462aa9fc4cSAvantika Mathur parent_group = (unsigned)grp % ngroups; 447ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 448a4912123STheodore Ts'o g = (parent_group + i) % ngroups; 449a4912123STheodore Ts'o get_orlov_stats(sb, g, flex_size, &stats); 450a4912123STheodore Ts'o if (!stats.free_inodes) 451ac27a0ecSDave Kleikamp continue; 452a4912123STheodore Ts'o if (stats.used_dirs >= best_ndir) 453ac27a0ecSDave Kleikamp continue; 454a4912123STheodore Ts'o if (stats.free_inodes < avefreei) 455ac27a0ecSDave Kleikamp continue; 45624aaa8efSTheodore Ts'o if (stats.free_clusters < avefreec) 457ac27a0ecSDave Kleikamp continue; 458a4912123STheodore Ts'o grp = g; 4592aa9fc4cSAvantika Mathur ret = 0; 460a4912123STheodore Ts'o best_ndir = stats.used_dirs; 461ac27a0ecSDave Kleikamp } 462a4912123STheodore Ts'o if (ret) 463a4912123STheodore Ts'o goto fallback; 464a4912123STheodore Ts'o found_flex_bg: 465a4912123STheodore Ts'o if (flex_size == 1) { 466a4912123STheodore Ts'o *group = grp; 467a4912123STheodore Ts'o return 0; 468a4912123STheodore Ts'o } 469a4912123STheodore Ts'o 470a4912123STheodore Ts'o /* 471a4912123STheodore Ts'o * We pack inodes at the beginning of the flexgroup's 472a4912123STheodore Ts'o * inode tables. Block allocation decisions will do 473a4912123STheodore Ts'o * something similar, although regular files will 474a4912123STheodore Ts'o * start at 2nd block group of the flexgroup. See 475a4912123STheodore Ts'o * ext4_ext_find_goal() and ext4_find_near(). 476a4912123STheodore Ts'o */ 477a4912123STheodore Ts'o grp *= flex_size; 478a4912123STheodore Ts'o for (i = 0; i < flex_size; i++) { 4798df9675fSTheodore Ts'o if (grp+i >= real_ngroups) 480a4912123STheodore Ts'o break; 481a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp+i, NULL); 482a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 483a4912123STheodore Ts'o *group = grp+i; 484a4912123STheodore Ts'o return 0; 485a4912123STheodore Ts'o } 486a4912123STheodore Ts'o } 487ac27a0ecSDave Kleikamp goto fallback; 488ac27a0ecSDave Kleikamp } 489ac27a0ecSDave Kleikamp 490ac27a0ecSDave Kleikamp max_dirs = ndirs / ngroups + inodes_per_group / 16; 491a4912123STheodore Ts'o min_inodes = avefreei - inodes_per_group*flex_size / 4; 492a4912123STheodore Ts'o if (min_inodes < 1) 493a4912123STheodore Ts'o min_inodes = 1; 49424aaa8efSTheodore Ts'o min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; 495ac27a0ecSDave Kleikamp 496a4912123STheodore Ts'o /* 497a4912123STheodore Ts'o * Start looking in the flex group where we last allocated an 498a4912123STheodore Ts'o * inode for this parent directory 499a4912123STheodore Ts'o */ 500a4912123STheodore Ts'o if (EXT4_I(parent)->i_last_alloc_group != ~0) { 501a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 502a4912123STheodore Ts'o if (flex_size > 1) 503a4912123STheodore Ts'o parent_group >>= sbi->s_log_groups_per_flex; 504a4912123STheodore Ts'o } 505ac27a0ecSDave Kleikamp 506ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 507a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 508a4912123STheodore Ts'o get_orlov_stats(sb, grp, flex_size, &stats); 509a4912123STheodore Ts'o if (stats.used_dirs >= max_dirs) 510ac27a0ecSDave Kleikamp continue; 511a4912123STheodore Ts'o if (stats.free_inodes < min_inodes) 512ac27a0ecSDave Kleikamp continue; 51324aaa8efSTheodore Ts'o if (stats.free_clusters < min_clusters) 514ac27a0ecSDave Kleikamp continue; 515a4912123STheodore Ts'o goto found_flex_bg; 516ac27a0ecSDave Kleikamp } 517ac27a0ecSDave Kleikamp 518ac27a0ecSDave Kleikamp fallback: 5198df9675fSTheodore Ts'o ngroups = real_ngroups; 520a4912123STheodore Ts'o avefreei = freei / ngroups; 521b5451f7bSTheodore Ts'o fallback_retry: 522a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_block_group; 523ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 524a4912123STheodore Ts'o grp = (parent_group + i) % ngroups; 525a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, grp, NULL); 526bb3d132aSDan Carpenter if (desc) { 52714c83c9fSTheodore Ts'o grp_free = ext4_free_inodes_count(sb, desc); 528bb3d132aSDan Carpenter if (grp_free && grp_free >= avefreei) { 529a4912123STheodore Ts'o *group = grp; 5302aa9fc4cSAvantika Mathur return 0; 531ac27a0ecSDave Kleikamp } 532a4912123STheodore Ts'o } 533bb3d132aSDan Carpenter } 534ac27a0ecSDave Kleikamp 535ac27a0ecSDave Kleikamp if (avefreei) { 536ac27a0ecSDave Kleikamp /* 537ac27a0ecSDave Kleikamp * The free-inodes counter is approximate, and for really small 538ac27a0ecSDave Kleikamp * filesystems the above test can fail to find any blockgroups 539ac27a0ecSDave Kleikamp */ 540ac27a0ecSDave Kleikamp avefreei = 0; 541b5451f7bSTheodore Ts'o goto fallback_retry; 542ac27a0ecSDave Kleikamp } 543ac27a0ecSDave Kleikamp 544ac27a0ecSDave Kleikamp return -1; 545ac27a0ecSDave Kleikamp } 546ac27a0ecSDave Kleikamp 5472aa9fc4cSAvantika Mathur static int find_group_other(struct super_block *sb, struct inode *parent, 548dcca3fecSAl Viro ext4_group_t *group, umode_t mode) 549ac27a0ecSDave Kleikamp { 550fd2d4291SAvantika Mathur ext4_group_t parent_group = EXT4_I(parent)->i_block_group; 5518df9675fSTheodore Ts'o ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); 552617ba13bSMingming Cao struct ext4_group_desc *desc; 553a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); 554a4912123STheodore Ts'o 555a4912123STheodore Ts'o /* 556a4912123STheodore Ts'o * Try to place the inode is the same flex group as its 557a4912123STheodore Ts'o * parent. If we can't find space, use the Orlov algorithm to 558a4912123STheodore Ts'o * find another flex group, and store that information in the 559a4912123STheodore Ts'o * parent directory's inode information so that use that flex 560a4912123STheodore Ts'o * group for future allocations. 561a4912123STheodore Ts'o */ 562a4912123STheodore Ts'o if (flex_size > 1) { 563a4912123STheodore Ts'o int retry = 0; 564a4912123STheodore Ts'o 565a4912123STheodore Ts'o try_again: 566a4912123STheodore Ts'o parent_group &= ~(flex_size-1); 567a4912123STheodore Ts'o last = parent_group + flex_size; 568a4912123STheodore Ts'o if (last > ngroups) 569a4912123STheodore Ts'o last = ngroups; 570a4912123STheodore Ts'o for (i = parent_group; i < last; i++) { 571a4912123STheodore Ts'o desc = ext4_get_group_desc(sb, i, NULL); 572a4912123STheodore Ts'o if (desc && ext4_free_inodes_count(sb, desc)) { 573a4912123STheodore Ts'o *group = i; 574a4912123STheodore Ts'o return 0; 575a4912123STheodore Ts'o } 576a4912123STheodore Ts'o } 577a4912123STheodore Ts'o if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { 578a4912123STheodore Ts'o retry = 1; 579a4912123STheodore Ts'o parent_group = EXT4_I(parent)->i_last_alloc_group; 580a4912123STheodore Ts'o goto try_again; 581a4912123STheodore Ts'o } 582a4912123STheodore Ts'o /* 583a4912123STheodore Ts'o * If this didn't work, use the Orlov search algorithm 584a4912123STheodore Ts'o * to find a new flex group; we pass in the mode to 585a4912123STheodore Ts'o * avoid the topdir algorithms. 586a4912123STheodore Ts'o */ 587a4912123STheodore Ts'o *group = parent_group + flex_size; 588a4912123STheodore Ts'o if (*group > ngroups) 589a4912123STheodore Ts'o *group = 0; 5907dc57615SPeter Huewe return find_group_orlov(sb, parent, group, mode, NULL); 591a4912123STheodore Ts'o } 592ac27a0ecSDave Kleikamp 593ac27a0ecSDave Kleikamp /* 594ac27a0ecSDave Kleikamp * Try to place the inode in its parent directory 595ac27a0ecSDave Kleikamp */ 5962aa9fc4cSAvantika Mathur *group = parent_group; 5972aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 598560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 599021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 6002aa9fc4cSAvantika Mathur return 0; 601ac27a0ecSDave Kleikamp 602ac27a0ecSDave Kleikamp /* 603ac27a0ecSDave Kleikamp * We're going to place this inode in a different blockgroup from its 604ac27a0ecSDave Kleikamp * parent. We want to cause files in a common directory to all land in 605ac27a0ecSDave Kleikamp * the same blockgroup. But we want files which are in a different 606ac27a0ecSDave Kleikamp * directory which shares a blockgroup with our parent to land in a 607ac27a0ecSDave Kleikamp * different blockgroup. 608ac27a0ecSDave Kleikamp * 609ac27a0ecSDave Kleikamp * So add our directory's i_ino into the starting point for the hash. 610ac27a0ecSDave Kleikamp */ 6112aa9fc4cSAvantika Mathur *group = (*group + parent->i_ino) % ngroups; 612ac27a0ecSDave Kleikamp 613ac27a0ecSDave Kleikamp /* 614ac27a0ecSDave Kleikamp * Use a quadratic hash to find a group with a free inode and some free 615ac27a0ecSDave Kleikamp * blocks. 616ac27a0ecSDave Kleikamp */ 617ac27a0ecSDave Kleikamp for (i = 1; i < ngroups; i <<= 1) { 6182aa9fc4cSAvantika Mathur *group += i; 6192aa9fc4cSAvantika Mathur if (*group >= ngroups) 6202aa9fc4cSAvantika Mathur *group -= ngroups; 6212aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 622560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc) && 623021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc)) 6242aa9fc4cSAvantika Mathur return 0; 625ac27a0ecSDave Kleikamp } 626ac27a0ecSDave Kleikamp 627ac27a0ecSDave Kleikamp /* 628ac27a0ecSDave Kleikamp * That failed: try linear search for a free inode, even if that group 629ac27a0ecSDave Kleikamp * has no free blocks. 630ac27a0ecSDave Kleikamp */ 6312aa9fc4cSAvantika Mathur *group = parent_group; 632ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 6332aa9fc4cSAvantika Mathur if (++*group >= ngroups) 6342aa9fc4cSAvantika Mathur *group = 0; 6352aa9fc4cSAvantika Mathur desc = ext4_get_group_desc(sb, *group, NULL); 636560671a0SAneesh Kumar K.V if (desc && ext4_free_inodes_count(sb, desc)) 6372aa9fc4cSAvantika Mathur return 0; 638ac27a0ecSDave Kleikamp } 639ac27a0ecSDave Kleikamp 640ac27a0ecSDave Kleikamp return -1; 641ac27a0ecSDave Kleikamp } 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp /* 64419883bd9STheodore Ts'o * In no journal mode, if an inode has recently been deleted, we want 64519883bd9STheodore Ts'o * to avoid reusing it until we're reasonably sure the inode table 64619883bd9STheodore Ts'o * block has been written back to disk. (Yes, these values are 64719883bd9STheodore Ts'o * somewhat arbitrary...) 64819883bd9STheodore Ts'o */ 64919883bd9STheodore Ts'o #define RECENTCY_MIN 5 650b5f51573SAndreas Dilger #define RECENTCY_DIRTY 300 65119883bd9STheodore Ts'o 65219883bd9STheodore Ts'o static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino) 65319883bd9STheodore Ts'o { 65419883bd9STheodore Ts'o struct ext4_group_desc *gdp; 65519883bd9STheodore Ts'o struct ext4_inode *raw_inode; 65619883bd9STheodore Ts'o struct buffer_head *bh; 65719883bd9STheodore Ts'o int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; 658b5f51573SAndreas Dilger int offset, ret = 0; 659b5f51573SAndreas Dilger int recentcy = RECENTCY_MIN; 660b5f51573SAndreas Dilger u32 dtime, now; 66119883bd9STheodore Ts'o 66219883bd9STheodore Ts'o gdp = ext4_get_group_desc(sb, group, NULL); 66319883bd9STheodore Ts'o if (unlikely(!gdp)) 66419883bd9STheodore Ts'o return 0; 66519883bd9STheodore Ts'o 6664f9d956dSJan Kara bh = sb_find_get_block(sb, ext4_inode_table(sb, gdp) + 66719883bd9STheodore Ts'o (ino / inodes_per_block)); 6684f9d956dSJan Kara if (!bh || !buffer_uptodate(bh)) 66919883bd9STheodore Ts'o /* 67019883bd9STheodore Ts'o * If the block is not in the buffer cache, then it 67119883bd9STheodore Ts'o * must have been written out. 67219883bd9STheodore Ts'o */ 67319883bd9STheodore Ts'o goto out; 67419883bd9STheodore Ts'o 67519883bd9STheodore Ts'o offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb); 67619883bd9STheodore Ts'o raw_inode = (struct ext4_inode *) (bh->b_data + offset); 677b5f51573SAndreas Dilger 678b5f51573SAndreas Dilger /* i_dtime is only 32 bits on disk, but we only care about relative 679b5f51573SAndreas Dilger * times in the range of a few minutes (i.e. long enough to sync a 680b5f51573SAndreas Dilger * recently-deleted inode to disk), so using the low 32 bits of the 681b5f51573SAndreas Dilger * clock (a 68 year range) is enough, see time_before32() */ 68219883bd9STheodore Ts'o dtime = le32_to_cpu(raw_inode->i_dtime); 683b5f51573SAndreas Dilger now = ktime_get_real_seconds(); 68419883bd9STheodore Ts'o if (buffer_dirty(bh)) 68519883bd9STheodore Ts'o recentcy += RECENTCY_DIRTY; 68619883bd9STheodore Ts'o 687b5f51573SAndreas Dilger if (dtime && time_before32(dtime, now) && 688b5f51573SAndreas Dilger time_before32(now, dtime + recentcy)) 68919883bd9STheodore Ts'o ret = 1; 69019883bd9STheodore Ts'o out: 69119883bd9STheodore Ts'o brelse(bh); 69219883bd9STheodore Ts'o return ret; 69319883bd9STheodore Ts'o } 69419883bd9STheodore Ts'o 695901ed070SWang Shilong static int find_inode_bit(struct super_block *sb, ext4_group_t group, 696901ed070SWang Shilong struct buffer_head *bitmap, unsigned long *ino) 697901ed070SWang Shilong { 698901ed070SWang Shilong next: 699901ed070SWang Shilong *ino = ext4_find_next_zero_bit((unsigned long *) 700901ed070SWang Shilong bitmap->b_data, 701901ed070SWang Shilong EXT4_INODES_PER_GROUP(sb), *ino); 702901ed070SWang Shilong if (*ino >= EXT4_INODES_PER_GROUP(sb)) 703901ed070SWang Shilong return 0; 704901ed070SWang Shilong 705901ed070SWang Shilong if ((EXT4_SB(sb)->s_journal == NULL) && 706901ed070SWang Shilong recently_deleted(sb, group, *ino)) { 707901ed070SWang Shilong *ino = *ino + 1; 708901ed070SWang Shilong if (*ino < EXT4_INODES_PER_GROUP(sb)) 709901ed070SWang Shilong goto next; 710901ed070SWang Shilong return 0; 711901ed070SWang Shilong } 712901ed070SWang Shilong 713901ed070SWang Shilong return 1; 714901ed070SWang Shilong } 715901ed070SWang Shilong 71619883bd9STheodore Ts'o /* 717ac27a0ecSDave Kleikamp * There are two policies for allocating an inode. If the new inode is 718ac27a0ecSDave Kleikamp * a directory, then a forward search is made for a block group with both 719ac27a0ecSDave Kleikamp * free space and a low directory-to-inode ratio; if that fails, then of 720ac27a0ecSDave Kleikamp * the groups with above-average free space, that group with the fewest 721ac27a0ecSDave Kleikamp * directories already is chosen. 722ac27a0ecSDave Kleikamp * 723ac27a0ecSDave Kleikamp * For other inodes, search forward from the parent directory's block 724ac27a0ecSDave Kleikamp * group to find a free inode. 725ac27a0ecSDave Kleikamp */ 7261139575aSTheodore Ts'o struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, 7271139575aSTheodore Ts'o umode_t mode, const struct qstr *qstr, 7281b917ed8STahsin Erdogan __u32 goal, uid_t *owner, __u32 i_flags, 7291b917ed8STahsin Erdogan int handle_type, unsigned int line_no, 7301b917ed8STahsin Erdogan int nblocks) 731ac27a0ecSDave Kleikamp { 732ac27a0ecSDave Kleikamp struct super_block *sb; 7333300bedaSAneesh Kumar K.V struct buffer_head *inode_bitmap_bh = NULL; 7343300bedaSAneesh Kumar K.V struct buffer_head *group_desc_bh; 7358df9675fSTheodore Ts'o ext4_group_t ngroups, group = 0; 736ac27a0ecSDave Kleikamp unsigned long ino = 0; 737ac27a0ecSDave Kleikamp struct inode *inode; 738617ba13bSMingming Cao struct ext4_group_desc *gdp = NULL; 739617ba13bSMingming Cao struct ext4_inode_info *ei; 740617ba13bSMingming Cao struct ext4_sb_info *sbi; 741a7cdadeeSJan Kara int ret2, err; 742ac27a0ecSDave Kleikamp struct inode *ret; 7432aa9fc4cSAvantika Mathur ext4_group_t i; 744772cb7c8SJose R. Santos ext4_group_t flex_group; 74587a39389SDarrick J. Wong struct ext4_group_info *grp; 746e709e9dfSTheodore Ts'o int encrypt = 0; 747ac27a0ecSDave Kleikamp 748ac27a0ecSDave Kleikamp /* Cannot create files in a deleted directory */ 749ac27a0ecSDave Kleikamp if (!dir || !dir->i_nlink) 750ac27a0ecSDave Kleikamp return ERR_PTR(-EPERM); 751ac27a0ecSDave Kleikamp 752af65207cSTahsin Erdogan sb = dir->i_sb; 753af65207cSTahsin Erdogan sbi = EXT4_SB(sb); 754af65207cSTahsin Erdogan 755af65207cSTahsin Erdogan if (unlikely(ext4_forced_shutdown(sbi))) 7560db1ff22STheodore Ts'o return ERR_PTR(-EIO); 7570db1ff22STheodore Ts'o 758af65207cSTahsin Erdogan if ((ext4_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) && 759ad47f953STahsin Erdogan (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) && 760ad47f953STahsin Erdogan !(i_flags & EXT4_EA_INODE_FL)) { 761a7550b30SJaegeuk Kim err = fscrypt_get_encryption_info(dir); 762e709e9dfSTheodore Ts'o if (err) 763e709e9dfSTheodore Ts'o return ERR_PTR(err); 764a7550b30SJaegeuk Kim if (!fscrypt_has_encryption_key(dir)) 76554475f53SEric Biggers return ERR_PTR(-ENOKEY); 766e709e9dfSTheodore Ts'o encrypt = 1; 767e709e9dfSTheodore Ts'o } 768e709e9dfSTheodore Ts'o 769af65207cSTahsin Erdogan if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) { 770af65207cSTahsin Erdogan #ifdef CONFIG_EXT4_FS_POSIX_ACL 771af65207cSTahsin Erdogan struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT); 772af65207cSTahsin Erdogan 773996fc447STheodore Ts'o if (IS_ERR(p)) 774996fc447STheodore Ts'o return ERR_CAST(p); 775af65207cSTahsin Erdogan if (p) { 776af65207cSTahsin Erdogan int acl_size = p->a_count * sizeof(ext4_acl_entry); 777af65207cSTahsin Erdogan 778af65207cSTahsin Erdogan nblocks += (S_ISDIR(mode) ? 2 : 1) * 779af65207cSTahsin Erdogan __ext4_xattr_set_credits(sb, NULL /* inode */, 780af65207cSTahsin Erdogan NULL /* block_bh */, acl_size, 781af65207cSTahsin Erdogan true /* is_create */); 782af65207cSTahsin Erdogan posix_acl_release(p); 783af65207cSTahsin Erdogan } 784af65207cSTahsin Erdogan #endif 785af65207cSTahsin Erdogan 786af65207cSTahsin Erdogan #ifdef CONFIG_SECURITY 787af65207cSTahsin Erdogan { 788af65207cSTahsin Erdogan int num_security_xattrs = 1; 789af65207cSTahsin Erdogan 790af65207cSTahsin Erdogan #ifdef CONFIG_INTEGRITY 791af65207cSTahsin Erdogan num_security_xattrs++; 792af65207cSTahsin Erdogan #endif 793af65207cSTahsin Erdogan /* 794af65207cSTahsin Erdogan * We assume that security xattrs are never 795af65207cSTahsin Erdogan * more than 1k. In practice they are under 796af65207cSTahsin Erdogan * 128 bytes. 797af65207cSTahsin Erdogan */ 798af65207cSTahsin Erdogan nblocks += num_security_xattrs * 799af65207cSTahsin Erdogan __ext4_xattr_set_credits(sb, NULL /* inode */, 800af65207cSTahsin Erdogan NULL /* block_bh */, 1024, 801af65207cSTahsin Erdogan true /* is_create */); 802af65207cSTahsin Erdogan } 803af65207cSTahsin Erdogan #endif 804af65207cSTahsin Erdogan if (encrypt) 805af65207cSTahsin Erdogan nblocks += __ext4_xattr_set_credits(sb, 806af65207cSTahsin Erdogan NULL /* inode */, NULL /* block_bh */, 807af65207cSTahsin Erdogan FSCRYPT_SET_CONTEXT_MAX_SIZE, 808af65207cSTahsin Erdogan true /* is_create */); 809af65207cSTahsin Erdogan } 810af65207cSTahsin Erdogan 8118df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 8129bffad1eSTheodore Ts'o trace_ext4_request_inode(dir, mode); 813ac27a0ecSDave Kleikamp inode = new_inode(sb); 814ac27a0ecSDave Kleikamp if (!inode) 815ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 816617ba13bSMingming Cao ei = EXT4_I(inode); 817772cb7c8SJose R. Santos 818eb9cc7e1SJan Kara /* 819b8a07463SAdam Buchbinder * Initialize owners and quota early so that we don't have to account 820eb9cc7e1SJan Kara * for quota initialization worst case in standard inode creating 821eb9cc7e1SJan Kara * transaction 822eb9cc7e1SJan Kara */ 823eb9cc7e1SJan Kara if (owner) { 824eb9cc7e1SJan Kara inode->i_mode = mode; 825eb9cc7e1SJan Kara i_uid_write(inode, owner[0]); 826eb9cc7e1SJan Kara i_gid_write(inode, owner[1]); 827eb9cc7e1SJan Kara } else if (test_opt(sb, GRPID)) { 828eb9cc7e1SJan Kara inode->i_mode = mode; 829eb9cc7e1SJan Kara inode->i_uid = current_fsuid(); 830eb9cc7e1SJan Kara inode->i_gid = dir->i_gid; 831eb9cc7e1SJan Kara } else 832eb9cc7e1SJan Kara inode_init_owner(inode, dir, mode); 833040cb378SLi Xi 8340b7b7779SKaho Ng if (ext4_has_feature_project(sb) && 835040cb378SLi Xi ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) 836040cb378SLi Xi ei->i_projid = EXT4_I(dir)->i_projid; 837040cb378SLi Xi else 838040cb378SLi Xi ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID); 839040cb378SLi Xi 840a7cdadeeSJan Kara err = dquot_initialize(inode); 841a7cdadeeSJan Kara if (err) 842a7cdadeeSJan Kara goto out; 843eb9cc7e1SJan Kara 84411013911SAndreas Dilger if (!goal) 84511013911SAndreas Dilger goal = sbi->s_inode_goal; 84611013911SAndreas Dilger 847e6462869SJohann Lombardi if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { 84811013911SAndreas Dilger group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); 84911013911SAndreas Dilger ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); 85011013911SAndreas Dilger ret2 = 0; 85111013911SAndreas Dilger goto got_group; 85211013911SAndreas Dilger } 85311013911SAndreas Dilger 8544113c4caSLukas Czerner if (S_ISDIR(mode)) 855f157a4aaSTheodore Ts'o ret2 = find_group_orlov(sb, dir, &group, mode, qstr); 8564113c4caSLukas Czerner else 857a4912123STheodore Ts'o ret2 = find_group_other(sb, dir, &group, mode); 858ac27a0ecSDave Kleikamp 859772cb7c8SJose R. Santos got_group: 860a4912123STheodore Ts'o EXT4_I(dir)->i_last_alloc_group = group; 861ac27a0ecSDave Kleikamp err = -ENOSPC; 8622aa9fc4cSAvantika Mathur if (ret2 == -1) 863ac27a0ecSDave Kleikamp goto out; 864ac27a0ecSDave Kleikamp 865119c0d44STheodore Ts'o /* 866119c0d44STheodore Ts'o * Normally we will only go through one pass of this loop, 867119c0d44STheodore Ts'o * unless we get unlucky and it turns out the group we selected 868119c0d44STheodore Ts'o * had its last inode grabbed by someone else. 869119c0d44STheodore Ts'o */ 87011013911SAndreas Dilger for (i = 0; i < ngroups; i++, ino = 0) { 871ac27a0ecSDave Kleikamp err = -EIO; 872ac27a0ecSDave Kleikamp 8733300bedaSAneesh Kumar K.V gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 874ac27a0ecSDave Kleikamp if (!gdp) 875eb9cc7e1SJan Kara goto out; 876ac27a0ecSDave Kleikamp 877f2a09af6SYongqiang Yang /* 878f2a09af6SYongqiang Yang * Check free inodes count before loading bitmap. 879f2a09af6SYongqiang Yang */ 8802fe435d8SWang Shilong if (ext4_free_inodes_count(sb, gdp) == 0) 8812fe435d8SWang Shilong goto next_group; 882f2a09af6SYongqiang Yang 88387a39389SDarrick J. Wong grp = ext4_get_group_info(sb, group); 88487a39389SDarrick J. Wong /* Skip groups with already-known suspicious inode tables */ 8852fe435d8SWang Shilong if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) 8862fe435d8SWang Shilong goto next_group; 88787a39389SDarrick J. Wong 8883300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 8893300bedaSAneesh Kumar K.V inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); 89087a39389SDarrick J. Wong /* Skip groups with suspicious inode tables */ 8919008a58eSDarrick J. Wong if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) || 8929008a58eSDarrick J. Wong IS_ERR(inode_bitmap_bh)) { 8939008a58eSDarrick J. Wong inode_bitmap_bh = NULL; 8942fe435d8SWang Shilong goto next_group; 89587a39389SDarrick J. Wong } 896ac27a0ecSDave Kleikamp 897ac27a0ecSDave Kleikamp repeat_in_this_group: 898901ed070SWang Shilong ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino); 899901ed070SWang Shilong if (!ret2) 900a34eb503STheodore Ts'o goto next_group; 901901ed070SWang Shilong 902119c0d44STheodore Ts'o if (group == 0 && (ino + 1) < EXT4_FIRST_INO(sb)) { 903119c0d44STheodore Ts'o ext4_error(sb, "reserved inode found cleared - " 904119c0d44STheodore Ts'o "inode=%lu", ino + 1); 9052fe435d8SWang Shilong goto next_group; 906119c0d44STheodore Ts'o } 907901ed070SWang Shilong 9081139575aSTheodore Ts'o if (!handle) { 9091139575aSTheodore Ts'o BUG_ON(nblocks <= 0); 9101139575aSTheodore Ts'o handle = __ext4_journal_start_sb(dir->i_sb, line_no, 9115fe2fe89SJan Kara handle_type, nblocks, 9125fe2fe89SJan Kara 0); 9131139575aSTheodore Ts'o if (IS_ERR(handle)) { 9141139575aSTheodore Ts'o err = PTR_ERR(handle); 915eb9cc7e1SJan Kara ext4_std_error(sb, err); 916eb9cc7e1SJan Kara goto out; 9171139575aSTheodore Ts'o } 9181139575aSTheodore Ts'o } 919ffb5387eSEric Sandeen BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); 920ffb5387eSEric Sandeen err = ext4_journal_get_write_access(handle, inode_bitmap_bh); 921eb9cc7e1SJan Kara if (err) { 922eb9cc7e1SJan Kara ext4_std_error(sb, err); 923eb9cc7e1SJan Kara goto out; 924eb9cc7e1SJan Kara } 925119c0d44STheodore Ts'o ext4_lock_group(sb, group); 926119c0d44STheodore Ts'o ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); 927901ed070SWang Shilong if (ret2) { 928901ed070SWang Shilong /* Someone already took the bit. Repeat the search 929901ed070SWang Shilong * with lock held. 930901ed070SWang Shilong */ 931901ed070SWang Shilong ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino); 932901ed070SWang Shilong if (ret2) { 933901ed070SWang Shilong ext4_set_bit(ino, inode_bitmap_bh->b_data); 934901ed070SWang Shilong ret2 = 0; 935901ed070SWang Shilong } else { 936901ed070SWang Shilong ret2 = 1; /* we didn't grab the inode */ 937901ed070SWang Shilong } 938901ed070SWang Shilong } 939119c0d44STheodore Ts'o ext4_unlock_group(sb, group); 940119c0d44STheodore Ts'o ino++; /* the inode bitmap is zero-based */ 941119c0d44STheodore Ts'o if (!ret2) 942119c0d44STheodore Ts'o goto got; /* we grabbed the inode! */ 943901ed070SWang Shilong 944119c0d44STheodore Ts'o if (ino < EXT4_INODES_PER_GROUP(sb)) 945119c0d44STheodore Ts'o goto repeat_in_this_group; 946a34eb503STheodore Ts'o next_group: 947a34eb503STheodore Ts'o if (++group == ngroups) 948a34eb503STheodore Ts'o group = 0; 949ac27a0ecSDave Kleikamp } 950ac27a0ecSDave Kleikamp err = -ENOSPC; 951ac27a0ecSDave Kleikamp goto out; 952ac27a0ecSDave Kleikamp 953ac27a0ecSDave Kleikamp got: 954ffb5387eSEric Sandeen BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); 955ffb5387eSEric Sandeen err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); 956eb9cc7e1SJan Kara if (err) { 957eb9cc7e1SJan Kara ext4_std_error(sb, err); 958eb9cc7e1SJan Kara goto out; 959eb9cc7e1SJan Kara } 960ffb5387eSEric Sandeen 96161c219f5STheodore Ts'o BUFFER_TRACE(group_desc_bh, "get_write_access"); 96261c219f5STheodore Ts'o err = ext4_journal_get_write_access(handle, group_desc_bh); 96361c219f5STheodore Ts'o if (err) { 96461c219f5STheodore Ts'o ext4_std_error(sb, err); 96561c219f5STheodore Ts'o goto out; 96661c219f5STheodore Ts'o } 96761c219f5STheodore Ts'o 968717d50e4SAndreas Dilger /* We may have to initialize the block bitmap if it isn't already */ 969feb0ab32SDarrick J. Wong if (ext4_has_group_desc_csum(sb) && 970717d50e4SAndreas Dilger gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 9713300bedaSAneesh Kumar K.V struct buffer_head *block_bitmap_bh; 972717d50e4SAndreas Dilger 9733300bedaSAneesh Kumar K.V block_bitmap_bh = ext4_read_block_bitmap(sb, group); 9749008a58eSDarrick J. Wong if (IS_ERR(block_bitmap_bh)) { 9759008a58eSDarrick J. Wong err = PTR_ERR(block_bitmap_bh); 976599a9b77SJan Kara goto out; 977599a9b77SJan Kara } 9783300bedaSAneesh Kumar K.V BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); 9793300bedaSAneesh Kumar K.V err = ext4_journal_get_write_access(handle, block_bitmap_bh); 980717d50e4SAndreas Dilger if (err) { 9813300bedaSAneesh Kumar K.V brelse(block_bitmap_bh); 982eb9cc7e1SJan Kara ext4_std_error(sb, err); 983eb9cc7e1SJan Kara goto out; 984717d50e4SAndreas Dilger } 985717d50e4SAndreas Dilger 986fd034a84STheodore Ts'o BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); 987fd034a84STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); 988fd034a84STheodore Ts'o 989717d50e4SAndreas Dilger /* recheck and clear flag under lock if we still need to */ 990fd034a84STheodore Ts'o ext4_lock_group(sb, group); 991717d50e4SAndreas Dilger if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 9923300bedaSAneesh Kumar K.V gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 993021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 994cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, group, gdp)); 995fa77dcfaSDarrick J. Wong ext4_block_bitmap_csum_set(sb, group, gdp, 99679f1ba49STao Ma block_bitmap_bh); 997feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 998717d50e4SAndreas Dilger } 999955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, group); 1000aeb1e5d6STheodore Ts'o brelse(block_bitmap_bh); 1001717d50e4SAndreas Dilger 1002eb9cc7e1SJan Kara if (err) { 1003eb9cc7e1SJan Kara ext4_std_error(sb, err); 1004eb9cc7e1SJan Kara goto out; 1005eb9cc7e1SJan Kara } 1006717d50e4SAndreas Dilger } 1007119c0d44STheodore Ts'o 1008119c0d44STheodore Ts'o /* Update the relevant bg descriptor fields */ 100941a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 1010119c0d44STheodore Ts'o int free; 1011119c0d44STheodore Ts'o struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1012119c0d44STheodore Ts'o 1013119c0d44STheodore Ts'o down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ 1014119c0d44STheodore Ts'o ext4_lock_group(sb, group); /* while we modify the bg desc */ 1015119c0d44STheodore Ts'o free = EXT4_INODES_PER_GROUP(sb) - 1016119c0d44STheodore Ts'o ext4_itable_unused_count(sb, gdp); 1017119c0d44STheodore Ts'o if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { 1018119c0d44STheodore Ts'o gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); 1019119c0d44STheodore Ts'o free = 0; 1020119c0d44STheodore Ts'o } 1021119c0d44STheodore Ts'o /* 1022119c0d44STheodore Ts'o * Check the relative inode number against the last used 1023119c0d44STheodore Ts'o * relative inode number in this group. if it is greater 1024119c0d44STheodore Ts'o * we need to update the bg_itable_unused count 1025119c0d44STheodore Ts'o */ 1026119c0d44STheodore Ts'o if (ino > free) 1027119c0d44STheodore Ts'o ext4_itable_unused_set(sb, gdp, 1028119c0d44STheodore Ts'o (EXT4_INODES_PER_GROUP(sb) - ino)); 1029119c0d44STheodore Ts'o up_read(&grp->alloc_sem); 10306f2e9f0eSTao Ma } else { 10316f2e9f0eSTao Ma ext4_lock_group(sb, group); 1032119c0d44STheodore Ts'o } 10336f2e9f0eSTao Ma 1034119c0d44STheodore Ts'o ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); 1035119c0d44STheodore Ts'o if (S_ISDIR(mode)) { 1036119c0d44STheodore Ts'o ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); 1037119c0d44STheodore Ts'o if (sbi->s_log_groups_per_flex) { 1038119c0d44STheodore Ts'o ext4_group_t f = ext4_flex_group(sbi, group); 1039119c0d44STheodore Ts'o 1040119c0d44STheodore Ts'o atomic_inc(&sbi->s_flex_groups[f].used_dirs); 1041119c0d44STheodore Ts'o } 1042119c0d44STheodore Ts'o } 104341a246d1SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) { 104441a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, 104541a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 1046feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1047119c0d44STheodore Ts'o } 10486f2e9f0eSTao Ma ext4_unlock_group(sb, group); 1049119c0d44STheodore Ts'o 10503300bedaSAneesh Kumar K.V BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); 10513300bedaSAneesh Kumar K.V err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); 1052eb9cc7e1SJan Kara if (err) { 1053eb9cc7e1SJan Kara ext4_std_error(sb, err); 1054eb9cc7e1SJan Kara goto out; 1055eb9cc7e1SJan Kara } 1056ac27a0ecSDave Kleikamp 1057ac27a0ecSDave Kleikamp percpu_counter_dec(&sbi->s_freeinodes_counter); 1058ac27a0ecSDave Kleikamp if (S_ISDIR(mode)) 1059ac27a0ecSDave Kleikamp percpu_counter_inc(&sbi->s_dirs_counter); 1060ac27a0ecSDave Kleikamp 1061772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 1062772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, group); 10639f24e420STheodore Ts'o atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); 1064772cb7c8SJose R. Santos } 1065ac27a0ecSDave Kleikamp 1066717d50e4SAndreas Dilger inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); 1067ac27a0ecSDave Kleikamp /* This is the optimal IO size (for stat), not the fs block size */ 1068ac27a0ecSDave Kleikamp inode->i_blocks = 0; 1069ef7f3835SKalpak Shah inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 1070eeca7ea1SDeepa Dinamani current_time(inode); 1071ac27a0ecSDave Kleikamp 1072ac27a0ecSDave Kleikamp memset(ei->i_data, 0, sizeof(ei->i_data)); 1073ac27a0ecSDave Kleikamp ei->i_dir_start_lookup = 0; 1074ac27a0ecSDave Kleikamp ei->i_disksize = 0; 1075ac27a0ecSDave Kleikamp 10764af83508SEryu Guan /* Don't inherit extent flag from directory, amongst others. */ 10772dc6b0d4SDuane Griffin ei->i_flags = 10782dc6b0d4SDuane Griffin ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); 10791b917ed8STahsin Erdogan ei->i_flags |= i_flags; 1080ac27a0ecSDave Kleikamp ei->i_file_acl = 0; 1081ac27a0ecSDave Kleikamp ei->i_dtime = 0; 1082ac27a0ecSDave Kleikamp ei->i_block_group = group; 1083a4912123STheodore Ts'o ei->i_last_alloc_group = ~0; 1084ac27a0ecSDave Kleikamp 1085617ba13bSMingming Cao ext4_set_inode_flags(inode); 1086ac27a0ecSDave Kleikamp if (IS_DIRSYNC(inode)) 10870390131bSFrank Mayhar ext4_handle_sync(handle); 10886b38e842SAl Viro if (insert_inode_locked(inode) < 0) { 1089acd6ad83SJan Kara /* 1090acd6ad83SJan Kara * Likely a bitmap corruption causing inode to be allocated 1091acd6ad83SJan Kara * twice. 1092acd6ad83SJan Kara */ 1093acd6ad83SJan Kara err = -EIO; 1094eb9cc7e1SJan Kara ext4_error(sb, "failed to insert inode %lu: doubly allocated?", 1095eb9cc7e1SJan Kara inode->i_ino); 1096eb9cc7e1SJan Kara goto out; 10976b38e842SAl Viro } 109823253068STheodore Ts'o inode->i_generation = prandom_u32(); 1099ac27a0ecSDave Kleikamp 1100814525f4SDarrick J. Wong /* Precompute checksum seed for inode metadata */ 11019aa5d32bSDmitry Monakhov if (ext4_has_metadata_csum(sb)) { 1102814525f4SDarrick J. Wong __u32 csum; 1103814525f4SDarrick J. Wong __le32 inum = cpu_to_le32(inode->i_ino); 1104814525f4SDarrick J. Wong __le32 gen = cpu_to_le32(inode->i_generation); 1105814525f4SDarrick J. Wong csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, 1106814525f4SDarrick J. Wong sizeof(inum)); 1107814525f4SDarrick J. Wong ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, 1108814525f4SDarrick J. Wong sizeof(gen)); 1109814525f4SDarrick J. Wong } 1110814525f4SDarrick J. Wong 1111353eb83cSTheodore Ts'o ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ 111219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NEW); 1113ef7f3835SKalpak Shah 111449598e04SJun Piao ei->i_extra_isize = sbi->s_want_extra_isize; 1115f08225d1STao Ma ei->i_inline_off = 0; 1116e2b911c5SDarrick J. Wong if (ext4_has_feature_inline_data(sb)) 1117f08225d1STao Ma ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); 1118ac27a0ecSDave Kleikamp ret = inode; 111963936ddaSChristoph Hellwig err = dquot_alloc_inode(inode); 112063936ddaSChristoph Hellwig if (err) 1121ac27a0ecSDave Kleikamp goto fail_drop; 1122ac27a0ecSDave Kleikamp 1123aa1dca3bSEric Biggers /* 1124aa1dca3bSEric Biggers * Since the encryption xattr will always be unique, create it first so 1125aa1dca3bSEric Biggers * that it's less likely to end up in an external xattr block and 1126aa1dca3bSEric Biggers * prevent its deduplication. 1127aa1dca3bSEric Biggers */ 1128aa1dca3bSEric Biggers if (encrypt) { 1129aa1dca3bSEric Biggers err = fscrypt_inherit_context(dir, inode, handle, true); 1130aa1dca3bSEric Biggers if (err) 1131aa1dca3bSEric Biggers goto fail_free_drop; 1132aa1dca3bSEric Biggers } 1133aa1dca3bSEric Biggers 11341b917ed8STahsin Erdogan if (!(ei->i_flags & EXT4_EA_INODE_FL)) { 1135617ba13bSMingming Cao err = ext4_init_acl(handle, inode, dir); 1136ac27a0ecSDave Kleikamp if (err) 1137ac27a0ecSDave Kleikamp goto fail_free_drop; 1138ac27a0ecSDave Kleikamp 11392a7dba39SEric Paris err = ext4_init_security(handle, inode, dir, qstr); 1140ac27a0ecSDave Kleikamp if (err) 1141ac27a0ecSDave Kleikamp goto fail_free_drop; 1142ad47f953STahsin Erdogan } 1143ac27a0ecSDave Kleikamp 1144e2b911c5SDarrick J. Wong if (ext4_has_feature_extents(sb)) { 1145e4079a11SEric Sandeen /* set extent flag only for directory, file and normal symlink*/ 1146e65187e6SAneesh Kumar K.V if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { 114712e9b892SDmitry Monakhov ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); 1148a86c6181SAlex Tomas ext4_ext_tree_init(handle, inode); 1149a86c6181SAlex Tomas } 115042bf0383SAneesh Kumar K.V } 1151ac27a0ecSDave Kleikamp 1152688f869cSTheodore Ts'o if (ext4_handle_valid(handle)) { 1153688f869cSTheodore Ts'o ei->i_sync_tid = handle->h_transaction->t_tid; 1154688f869cSTheodore Ts'o ei->i_datasync_tid = handle->h_transaction->t_tid; 1155688f869cSTheodore Ts'o } 1156688f869cSTheodore Ts'o 11578753e88fSAneesh Kumar K.V err = ext4_mark_inode_dirty(handle, inode); 11588753e88fSAneesh Kumar K.V if (err) { 11598753e88fSAneesh Kumar K.V ext4_std_error(sb, err); 11608753e88fSAneesh Kumar K.V goto fail_free_drop; 11618753e88fSAneesh Kumar K.V } 11628753e88fSAneesh Kumar K.V 1163617ba13bSMingming Cao ext4_debug("allocating inode %lu\n", inode->i_ino); 11649bffad1eSTheodore Ts'o trace_ext4_allocate_inode(inode, dir, mode); 11653300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 1166ac27a0ecSDave Kleikamp return ret; 1167ac27a0ecSDave Kleikamp 1168ac27a0ecSDave Kleikamp fail_free_drop: 116963936ddaSChristoph Hellwig dquot_free_inode(inode); 1170ac27a0ecSDave Kleikamp fail_drop: 11716d6b77f1SMiklos Szeredi clear_nlink(inode); 11726b38e842SAl Viro unlock_new_inode(inode); 1173eb9cc7e1SJan Kara out: 1174eb9cc7e1SJan Kara dquot_drop(inode); 1175eb9cc7e1SJan Kara inode->i_flags |= S_NOQUOTA; 1176ac27a0ecSDave Kleikamp iput(inode); 11773300bedaSAneesh Kumar K.V brelse(inode_bitmap_bh); 1178ac27a0ecSDave Kleikamp return ERR_PTR(err); 1179ac27a0ecSDave Kleikamp } 1180ac27a0ecSDave Kleikamp 1181ac27a0ecSDave Kleikamp /* Verify that we are loading a valid orphan from disk */ 1182617ba13bSMingming Cao struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) 1183ac27a0ecSDave Kleikamp { 1184617ba13bSMingming Cao unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); 1185fd2d4291SAvantika Mathur ext4_group_t block_group; 1186ac27a0ecSDave Kleikamp int bit; 11877827a7f6STheodore Ts'o struct buffer_head *bitmap_bh = NULL; 1188ac27a0ecSDave Kleikamp struct inode *inode = NULL; 11897827a7f6STheodore Ts'o int err = -EFSCORRUPTED; 1190ac27a0ecSDave Kleikamp 11917827a7f6STheodore Ts'o if (ino < EXT4_FIRST_INO(sb) || ino > max_ino) 11927827a7f6STheodore Ts'o goto bad_orphan; 1193ac27a0ecSDave Kleikamp 1194617ba13bSMingming Cao block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); 1195617ba13bSMingming Cao bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); 1196e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, block_group); 11979008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 11987827a7f6STheodore Ts'o ext4_error(sb, "inode bitmap error %ld for orphan %lu", 11997827a7f6STheodore Ts'o ino, PTR_ERR(bitmap_bh)); 12007827a7f6STheodore Ts'o return (struct inode *) bitmap_bh; 1201ac27a0ecSDave Kleikamp } 1202ac27a0ecSDave Kleikamp 1203ac27a0ecSDave Kleikamp /* Having the inode bit set should be a 100% indicator that this 1204ac27a0ecSDave Kleikamp * is a valid orphan (no e2fsck run on fs). Orphans also include 1205ac27a0ecSDave Kleikamp * inodes that were being truncated, so we can't check i_nlink==0. 1206ac27a0ecSDave Kleikamp */ 12071d1fe1eeSDavid Howells if (!ext4_test_bit(bit, bitmap_bh->b_data)) 12081d1fe1eeSDavid Howells goto bad_orphan; 12091d1fe1eeSDavid Howells 12101d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 12117827a7f6STheodore Ts'o if (IS_ERR(inode)) { 12127827a7f6STheodore Ts'o err = PTR_ERR(inode); 12137827a7f6STheodore Ts'o ext4_error(sb, "couldn't read orphan inode %lu (err %d)", 12147827a7f6STheodore Ts'o ino, err); 12157827a7f6STheodore Ts'o return inode; 12167827a7f6STheodore Ts'o } 12171d1fe1eeSDavid Howells 121891ef4cafSDuane Griffin /* 1219c9eb13a9STheodore Ts'o * If the orphans has i_nlinks > 0 then it should be able to 1220c9eb13a9STheodore Ts'o * be truncated, otherwise it won't be removed from the orphan 1221c9eb13a9STheodore Ts'o * list during processing and an infinite loop will result. 1222c9eb13a9STheodore Ts'o * Similarly, it must not be a bad inode. 122391ef4cafSDuane Griffin */ 1224c9eb13a9STheodore Ts'o if ((inode->i_nlink && !ext4_can_truncate(inode)) || 1225c9eb13a9STheodore Ts'o is_bad_inode(inode)) 122691ef4cafSDuane Griffin goto bad_orphan; 122791ef4cafSDuane Griffin 12281d1fe1eeSDavid Howells if (NEXT_ORPHAN(inode) > max_ino) 12291d1fe1eeSDavid Howells goto bad_orphan; 12301d1fe1eeSDavid Howells brelse(bitmap_bh); 12311d1fe1eeSDavid Howells return inode; 12321d1fe1eeSDavid Howells 12331d1fe1eeSDavid Howells bad_orphan: 12347827a7f6STheodore Ts'o ext4_error(sb, "bad orphan inode %lu", ino); 12357827a7f6STheodore Ts'o if (bitmap_bh) 12367827a7f6STheodore Ts'o printk(KERN_ERR "ext4_test_bit(bit=%d, block=%llu) = %d\n", 1237ac27a0ecSDave Kleikamp bit, (unsigned long long)bitmap_bh->b_blocknr, 1238617ba13bSMingming Cao ext4_test_bit(bit, bitmap_bh->b_data)); 1239ac27a0ecSDave Kleikamp if (inode) { 12407827a7f6STheodore Ts'o printk(KERN_ERR "is_bad_inode(inode)=%d\n", 1241ac27a0ecSDave Kleikamp is_bad_inode(inode)); 12427827a7f6STheodore Ts'o printk(KERN_ERR "NEXT_ORPHAN(inode)=%u\n", 1243ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 12447827a7f6STheodore Ts'o printk(KERN_ERR "max_ino=%lu\n", max_ino); 12457827a7f6STheodore Ts'o printk(KERN_ERR "i_nlink=%u\n", inode->i_nlink); 1246ac27a0ecSDave Kleikamp /* Avoid freeing blocks if we got a bad deleted inode */ 12471d1fe1eeSDavid Howells if (inode->i_nlink == 0) 1248ac27a0ecSDave Kleikamp inode->i_blocks = 0; 1249ac27a0ecSDave Kleikamp iput(inode); 1250ac27a0ecSDave Kleikamp } 1251ac27a0ecSDave Kleikamp brelse(bitmap_bh); 12521d1fe1eeSDavid Howells return ERR_PTR(err); 1253ac27a0ecSDave Kleikamp } 1254ac27a0ecSDave Kleikamp 1255617ba13bSMingming Cao unsigned long ext4_count_free_inodes(struct super_block *sb) 1256ac27a0ecSDave Kleikamp { 1257ac27a0ecSDave Kleikamp unsigned long desc_count; 1258617ba13bSMingming Cao struct ext4_group_desc *gdp; 12598df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1260617ba13bSMingming Cao #ifdef EXT4FS_DEBUG 1261617ba13bSMingming Cao struct ext4_super_block *es; 1262ac27a0ecSDave Kleikamp unsigned long bitmap_count, x; 1263ac27a0ecSDave Kleikamp struct buffer_head *bitmap_bh = NULL; 1264ac27a0ecSDave Kleikamp 1265617ba13bSMingming Cao es = EXT4_SB(sb)->s_es; 1266ac27a0ecSDave Kleikamp desc_count = 0; 1267ac27a0ecSDave Kleikamp bitmap_count = 0; 1268ac27a0ecSDave Kleikamp gdp = NULL; 12698df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1270617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1271ac27a0ecSDave Kleikamp if (!gdp) 1272ac27a0ecSDave Kleikamp continue; 1273560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1274ac27a0ecSDave Kleikamp brelse(bitmap_bh); 1275e29d1cdeSEric Sandeen bitmap_bh = ext4_read_inode_bitmap(sb, i); 12769008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 12779008a58eSDarrick J. Wong bitmap_bh = NULL; 1278ac27a0ecSDave Kleikamp continue; 12799008a58eSDarrick J. Wong } 1280ac27a0ecSDave Kleikamp 1281f6fb99caSTheodore Ts'o x = ext4_count_free(bitmap_bh->b_data, 1282f6fb99caSTheodore Ts'o EXT4_INODES_PER_GROUP(sb) / 8); 1283c549a95dSEric Sandeen printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", 1284785b4b3aSPeng Tao (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); 1285ac27a0ecSDave Kleikamp bitmap_count += x; 1286ac27a0ecSDave Kleikamp } 1287ac27a0ecSDave Kleikamp brelse(bitmap_bh); 12884776004fSTheodore Ts'o printk(KERN_DEBUG "ext4_count_free_inodes: " 12894776004fSTheodore Ts'o "stored = %u, computed = %lu, %lu\n", 1290ac27a0ecSDave Kleikamp le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); 1291ac27a0ecSDave Kleikamp return desc_count; 1292ac27a0ecSDave Kleikamp #else 1293ac27a0ecSDave Kleikamp desc_count = 0; 12948df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1295617ba13bSMingming Cao gdp = ext4_get_group_desc(sb, i, NULL); 1296ac27a0ecSDave Kleikamp if (!gdp) 1297ac27a0ecSDave Kleikamp continue; 1298560671a0SAneesh Kumar K.V desc_count += ext4_free_inodes_count(sb, gdp); 1299ac27a0ecSDave Kleikamp cond_resched(); 1300ac27a0ecSDave Kleikamp } 1301ac27a0ecSDave Kleikamp return desc_count; 1302ac27a0ecSDave Kleikamp #endif 1303ac27a0ecSDave Kleikamp } 1304ac27a0ecSDave Kleikamp 1305ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1306617ba13bSMingming Cao unsigned long ext4_count_dirs(struct super_block * sb) 1307ac27a0ecSDave Kleikamp { 1308ac27a0ecSDave Kleikamp unsigned long count = 0; 13098df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 1310ac27a0ecSDave Kleikamp 13118df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 1312617ba13bSMingming Cao struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1313ac27a0ecSDave Kleikamp if (!gdp) 1314ac27a0ecSDave Kleikamp continue; 1315560671a0SAneesh Kumar K.V count += ext4_used_dirs_count(sb, gdp); 1316ac27a0ecSDave Kleikamp } 1317ac27a0ecSDave Kleikamp return count; 1318ac27a0ecSDave Kleikamp } 1319bfff6873SLukas Czerner 1320bfff6873SLukas Czerner /* 1321bfff6873SLukas Czerner * Zeroes not yet zeroed inode table - just write zeroes through the whole 1322bfff6873SLukas Czerner * inode table. Must be called without any spinlock held. The only place 1323bfff6873SLukas Czerner * where it is called from on active part of filesystem is ext4lazyinit 1324bfff6873SLukas Czerner * thread, so we do not need any special locks, however we have to prevent 1325bfff6873SLukas Czerner * inode allocation from the current group, so we take alloc_sem lock, to 1326119c0d44STheodore Ts'o * block ext4_new_inode() until we are finished. 1327bfff6873SLukas Czerner */ 1328e0cbee3eSH Hartley Sweeten int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, 1329bfff6873SLukas Czerner int barrier) 1330bfff6873SLukas Czerner { 1331bfff6873SLukas Czerner struct ext4_group_info *grp = ext4_get_group_info(sb, group); 1332bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 1333bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 1334bfff6873SLukas Czerner struct buffer_head *group_desc_bh; 1335bfff6873SLukas Czerner handle_t *handle; 1336bfff6873SLukas Czerner ext4_fsblk_t blk; 1337bfff6873SLukas Czerner int num, ret = 0, used_blks = 0; 1338bfff6873SLukas Czerner 1339bfff6873SLukas Czerner /* This should not happen, but just to be sure check this */ 1340bc98a42cSDavid Howells if (sb_rdonly(sb)) { 1341bfff6873SLukas Czerner ret = 1; 1342bfff6873SLukas Czerner goto out; 1343bfff6873SLukas Czerner } 1344bfff6873SLukas Czerner 1345bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, &group_desc_bh); 1346bfff6873SLukas Czerner if (!gdp) 1347bfff6873SLukas Czerner goto out; 1348bfff6873SLukas Czerner 1349bfff6873SLukas Czerner /* 1350bfff6873SLukas Czerner * We do not need to lock this, because we are the only one 1351bfff6873SLukas Czerner * handling this flag. 1352bfff6873SLukas Czerner */ 1353bfff6873SLukas Czerner if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) 1354bfff6873SLukas Czerner goto out; 1355bfff6873SLukas Czerner 13569924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); 1357bfff6873SLukas Czerner if (IS_ERR(handle)) { 1358bfff6873SLukas Czerner ret = PTR_ERR(handle); 1359bfff6873SLukas Czerner goto out; 1360bfff6873SLukas Czerner } 1361bfff6873SLukas Czerner 1362bfff6873SLukas Czerner down_write(&grp->alloc_sem); 1363bfff6873SLukas Czerner /* 1364bfff6873SLukas Czerner * If inode bitmap was already initialized there may be some 1365bfff6873SLukas Czerner * used inodes so we need to skip blocks with used inodes in 1366bfff6873SLukas Czerner * inode table. 1367bfff6873SLukas Czerner */ 1368bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) 1369bfff6873SLukas Czerner used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - 1370bfff6873SLukas Czerner ext4_itable_unused_count(sb, gdp)), 1371bfff6873SLukas Czerner sbi->s_inodes_per_block); 1372bfff6873SLukas Czerner 1373857ac889SLukas Czerner if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { 13741084f252STheodore Ts'o ext4_error(sb, "Something is wrong with group %u: " 13751084f252STheodore Ts'o "used itable blocks: %d; " 13761084f252STheodore Ts'o "itable unused count: %u", 1377857ac889SLukas Czerner group, used_blks, 1378857ac889SLukas Czerner ext4_itable_unused_count(sb, gdp)); 1379857ac889SLukas Czerner ret = 1; 138033853a0dSYongqiang Yang goto err_out; 1381857ac889SLukas Czerner } 1382857ac889SLukas Czerner 1383bfff6873SLukas Czerner blk = ext4_inode_table(sb, gdp) + used_blks; 1384bfff6873SLukas Czerner num = sbi->s_itb_per_group - used_blks; 1385bfff6873SLukas Czerner 1386bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, "get_write_access"); 1387bfff6873SLukas Czerner ret = ext4_journal_get_write_access(handle, 1388bfff6873SLukas Czerner group_desc_bh); 1389bfff6873SLukas Czerner if (ret) 1390bfff6873SLukas Czerner goto err_out; 1391bfff6873SLukas Czerner 1392bfff6873SLukas Czerner /* 1393bfff6873SLukas Czerner * Skip zeroout if the inode table is full. But we set the ZEROED 1394bfff6873SLukas Czerner * flag anyway, because obviously, when it is full it does not need 1395bfff6873SLukas Czerner * further zeroing. 1396bfff6873SLukas Czerner */ 1397bfff6873SLukas Czerner if (unlikely(num == 0)) 1398bfff6873SLukas Czerner goto skip_zeroout; 1399bfff6873SLukas Czerner 1400bfff6873SLukas Czerner ext4_debug("going to zero out inode table in group %d\n", 1401bfff6873SLukas Czerner group); 1402a107e5a3STheodore Ts'o ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); 1403bfff6873SLukas Czerner if (ret < 0) 1404bfff6873SLukas Czerner goto err_out; 1405a107e5a3STheodore Ts'o if (barrier) 1406a107e5a3STheodore Ts'o blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); 1407bfff6873SLukas Czerner 1408bfff6873SLukas Czerner skip_zeroout: 1409bfff6873SLukas Czerner ext4_lock_group(sb, group); 1410bfff6873SLukas Czerner gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); 1411feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1412bfff6873SLukas Czerner ext4_unlock_group(sb, group); 1413bfff6873SLukas Czerner 1414bfff6873SLukas Czerner BUFFER_TRACE(group_desc_bh, 1415bfff6873SLukas Czerner "call ext4_handle_dirty_metadata"); 1416bfff6873SLukas Czerner ret = ext4_handle_dirty_metadata(handle, NULL, 1417bfff6873SLukas Czerner group_desc_bh); 1418bfff6873SLukas Czerner 1419bfff6873SLukas Czerner err_out: 1420bfff6873SLukas Czerner up_write(&grp->alloc_sem); 1421bfff6873SLukas Czerner ext4_journal_stop(handle); 1422bfff6873SLukas Czerner out: 1423bfff6873SLukas Czerner return ret; 1424bfff6873SLukas Czerner } 1425