1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/resize.c 4ac27a0ecSDave Kleikamp * 5617ba13bSMingming Cao * Support for resizing an ext4 filesystem while it is mounted. 6ac27a0ecSDave Kleikamp * 7ac27a0ecSDave Kleikamp * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> 8ac27a0ecSDave Kleikamp * 9ac27a0ecSDave Kleikamp * This could probably be made into a module, because it is not often in use. 10ac27a0ecSDave Kleikamp */ 11ac27a0ecSDave Kleikamp 12ac27a0ecSDave Kleikamp 13617ba13bSMingming Cao #define EXT4FS_DEBUG 14ac27a0ecSDave Kleikamp 15ac27a0ecSDave Kleikamp #include <linux/errno.h> 16ac27a0ecSDave Kleikamp #include <linux/slab.h> 17a861fb9fSWang Qing #include <linux/jiffies.h> 18ac27a0ecSDave Kleikamp 193dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 20ac27a0ecSDave Kleikamp 211d0c3924STheodore Ts'o struct ext4_rcu_ptr { 221d0c3924STheodore Ts'o struct rcu_head rcu; 231d0c3924STheodore Ts'o void *ptr; 241d0c3924STheodore Ts'o }; 251d0c3924STheodore Ts'o 261d0c3924STheodore Ts'o static void ext4_rcu_ptr_callback(struct rcu_head *head) 271d0c3924STheodore Ts'o { 281d0c3924STheodore Ts'o struct ext4_rcu_ptr *ptr; 291d0c3924STheodore Ts'o 301d0c3924STheodore Ts'o ptr = container_of(head, struct ext4_rcu_ptr, rcu); 311d0c3924STheodore Ts'o kvfree(ptr->ptr); 321d0c3924STheodore Ts'o kfree(ptr); 331d0c3924STheodore Ts'o } 341d0c3924STheodore Ts'o 351d0c3924STheodore Ts'o void ext4_kvfree_array_rcu(void *to_free) 361d0c3924STheodore Ts'o { 371d0c3924STheodore Ts'o struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); 381d0c3924STheodore Ts'o 391d0c3924STheodore Ts'o if (ptr) { 401d0c3924STheodore Ts'o ptr->ptr = to_free; 411d0c3924STheodore Ts'o call_rcu(&ptr->rcu, ext4_rcu_ptr_callback); 421d0c3924STheodore Ts'o return; 431d0c3924STheodore Ts'o } 441d0c3924STheodore Ts'o synchronize_rcu(); 451d0c3924STheodore Ts'o kvfree(to_free); 461d0c3924STheodore Ts'o } 471d0c3924STheodore Ts'o 488f82f840SYongqiang Yang int ext4_resize_begin(struct super_block *sb) 498f82f840SYongqiang Yang { 505f8c1093STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 518f82f840SYongqiang Yang int ret = 0; 528f82f840SYongqiang Yang 538f82f840SYongqiang Yang if (!capable(CAP_SYS_RESOURCE)) 548f82f840SYongqiang Yang return -EPERM; 558f82f840SYongqiang Yang 56ce723c31SYongqiang Yang /* 57b55c3cd1SZhang Yi * If the reserved GDT blocks is non-zero, the resize_inode feature 58b55c3cd1SZhang Yi * should always be set. 59b55c3cd1SZhang Yi */ 60b55c3cd1SZhang Yi if (EXT4_SB(sb)->s_es->s_reserved_gdt_blocks && 61b55c3cd1SZhang Yi !ext4_has_feature_resize_inode(sb)) { 62b55c3cd1SZhang Yi ext4_error(sb, "resize_inode disabled but reserved GDT blocks non-zero"); 63b55c3cd1SZhang Yi return -EFSCORRUPTED; 64b55c3cd1SZhang Yi } 65b55c3cd1SZhang Yi 66b55c3cd1SZhang Yi /* 67011fa994STheodore Ts'o * If we are not using the primary superblock/GDT copy don't resize, 68011fa994STheodore Ts'o * because the user tools have no way of handling this. Probably a 69011fa994STheodore Ts'o * bad time to do it anyways. 70011fa994STheodore Ts'o */ 715f8c1093STheodore Ts'o if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != 72011fa994STheodore Ts'o le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { 73011fa994STheodore Ts'o ext4_warning(sb, "won't resize using backup superblock at %llu", 74011fa994STheodore Ts'o (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); 75011fa994STheodore Ts'o return -EPERM; 76011fa994STheodore Ts'o } 77011fa994STheodore Ts'o 78011fa994STheodore Ts'o /* 79ce723c31SYongqiang Yang * We are not allowed to do online-resizing on a filesystem mounted 80ce723c31SYongqiang Yang * with error, because it can destroy the filesystem easily. 81ce723c31SYongqiang Yang */ 82ce723c31SYongqiang Yang if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 83ce723c31SYongqiang Yang ext4_warning(sb, "There are errors in the filesystem, " 848d2ae1cbSJakub Wilk "so online resizing is not allowed"); 85ce723c31SYongqiang Yang return -EPERM; 86ce723c31SYongqiang Yang } 87ce723c31SYongqiang Yang 88b1489186SJosh Triplett if (ext4_has_feature_sparse_super2(sb)) { 89b1489186SJosh Triplett ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2"); 90b1489186SJosh Triplett return -EOPNOTSUPP; 91b1489186SJosh Triplett } 92e9f9f61dSJosh Triplett 939549a168STheodore Ts'o if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 949549a168STheodore Ts'o &EXT4_SB(sb)->s_ext4_flags)) 958f82f840SYongqiang Yang ret = -EBUSY; 968f82f840SYongqiang Yang 978f82f840SYongqiang Yang return ret; 988f82f840SYongqiang Yang } 998f82f840SYongqiang Yang 100827891a3STheodore Ts'o int ext4_resize_end(struct super_block *sb, bool update_backups) 1018f82f840SYongqiang Yang { 1029549a168STheodore Ts'o clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); 1034e857c58SPeter Zijlstra smp_mb__after_atomic(); 104827891a3STheodore Ts'o if (update_backups) 105827891a3STheodore Ts'o return ext4_update_overhead(sb, true); 106827891a3STheodore Ts'o return 0; 1078f82f840SYongqiang Yang } 1088f82f840SYongqiang Yang 10901f795f9SYongqiang Yang static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, 11001f795f9SYongqiang Yang ext4_group_t group) { 11101f795f9SYongqiang Yang return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << 11201f795f9SYongqiang Yang EXT4_DESC_PER_BLOCK_BITS(sb); 11301f795f9SYongqiang Yang } 11401f795f9SYongqiang Yang 11501f795f9SYongqiang Yang static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, 11601f795f9SYongqiang Yang ext4_group_t group) { 11701f795f9SYongqiang Yang group = ext4_meta_bg_first_group(sb, group); 11801f795f9SYongqiang Yang return ext4_group_first_block_no(sb, group); 11901f795f9SYongqiang Yang } 12001f795f9SYongqiang Yang 12101f795f9SYongqiang Yang static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, 12201f795f9SYongqiang Yang ext4_group_t group) { 12301f795f9SYongqiang Yang ext4_grpblk_t overhead; 12401f795f9SYongqiang Yang overhead = ext4_bg_num_gdb(sb, group); 12501f795f9SYongqiang Yang if (ext4_bg_has_super(sb, group)) 12601f795f9SYongqiang Yang overhead += 1 + 12701f795f9SYongqiang Yang le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 12801f795f9SYongqiang Yang return overhead; 12901f795f9SYongqiang Yang } 13001f795f9SYongqiang Yang 131ac27a0ecSDave Kleikamp #define outside(b, first, last) ((b) < (first) || (b) >= (last)) 132ac27a0ecSDave Kleikamp #define inside(b, first, last) ((b) >= (first) && (b) < (last)) 133ac27a0ecSDave Kleikamp 134ac27a0ecSDave Kleikamp static int verify_group_input(struct super_block *sb, 135617ba13bSMingming Cao struct ext4_new_group_data *input) 136ac27a0ecSDave Kleikamp { 137617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 138617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 139bd81d8eeSLaurent Vivier ext4_fsblk_t start = ext4_blocks_count(es); 140617ba13bSMingming Cao ext4_fsblk_t end = start + input->blocks_count; 141fd2d4291SAvantika Mathur ext4_group_t group = input->group; 142617ba13bSMingming Cao ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; 143b302ef2dSTheodore Ts'o unsigned overhead; 144b302ef2dSTheodore Ts'o ext4_fsblk_t metaend; 145ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1463a5b2ecdSMingming Cao ext4_grpblk_t free_blocks_count, offset; 147ac27a0ecSDave Kleikamp int err = -EINVAL; 148ac27a0ecSDave Kleikamp 149b302ef2dSTheodore Ts'o if (group != sbi->s_groups_count) { 150b302ef2dSTheodore Ts'o ext4_warning(sb, "Cannot add at group %u (only %u groups)", 151b302ef2dSTheodore Ts'o input->group, sbi->s_groups_count); 152b302ef2dSTheodore Ts'o return -EINVAL; 153b302ef2dSTheodore Ts'o } 154b302ef2dSTheodore Ts'o 155b302ef2dSTheodore Ts'o overhead = ext4_group_overhead_blocks(sb, group); 156b302ef2dSTheodore Ts'o metaend = start + overhead; 157d77147ffSharshads input->free_clusters_count = free_blocks_count = 158ac27a0ecSDave Kleikamp input->blocks_count - 2 - overhead - sbi->s_itb_per_group; 159ac27a0ecSDave Kleikamp 160ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 161617ba13bSMingming Cao printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " 162ac27a0ecSDave Kleikamp "(%d free, %u reserved)\n", 163617ba13bSMingming Cao ext4_bg_has_super(sb, input->group) ? "normal" : 164ac27a0ecSDave Kleikamp "no-super", input->group, input->blocks_count, 165ac27a0ecSDave Kleikamp free_blocks_count, input->reserved_blocks); 166ac27a0ecSDave Kleikamp 1673a5b2ecdSMingming Cao ext4_get_group_no_and_offset(sb, start, NULL, &offset); 168b302ef2dSTheodore Ts'o if (offset != 0) 16912062dddSEric Sandeen ext4_warning(sb, "Last group not full"); 170ac27a0ecSDave Kleikamp else if (input->reserved_blocks > input->blocks_count / 5) 17112062dddSEric Sandeen ext4_warning(sb, "Reserved blocks too high (%u)", 172ac27a0ecSDave Kleikamp input->reserved_blocks); 173ac27a0ecSDave Kleikamp else if (free_blocks_count < 0) 17412062dddSEric Sandeen ext4_warning(sb, "Bad blocks count %u", 175ac27a0ecSDave Kleikamp input->blocks_count); 176fb265c9cSTheodore Ts'o else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { 177fb265c9cSTheodore Ts'o err = PTR_ERR(bh); 178fb265c9cSTheodore Ts'o bh = NULL; 17912062dddSEric Sandeen ext4_warning(sb, "Cannot read last block (%llu)", 180ac27a0ecSDave Kleikamp end - 1); 181fb265c9cSTheodore Ts'o } else if (outside(input->block_bitmap, start, end)) 18212062dddSEric Sandeen ext4_warning(sb, "Block bitmap not in group (block %llu)", 1831939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 184ac27a0ecSDave Kleikamp else if (outside(input->inode_bitmap, start, end)) 18512062dddSEric Sandeen ext4_warning(sb, "Inode bitmap not in group (block %llu)", 1861939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap); 187ac27a0ecSDave Kleikamp else if (outside(input->inode_table, start, end) || 188ac27a0ecSDave Kleikamp outside(itend - 1, start, end)) 18912062dddSEric Sandeen ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", 1901939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 191ac27a0ecSDave Kleikamp else if (input->inode_bitmap == input->block_bitmap) 19212062dddSEric Sandeen ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", 1931939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 194ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, input->inode_table, itend)) 19512062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in inode table " 19612062dddSEric Sandeen "(%llu-%llu)", 1971939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1981939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 199ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, input->inode_table, itend)) 20012062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in inode table " 20112062dddSEric Sandeen "(%llu-%llu)", 2021939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 2031939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 204ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, start, metaend)) 20512062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", 2061939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 2071939e49aSRandy Dunlap start, metaend - 1); 208ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, start, metaend)) 20912062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", 2101939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 2111939e49aSRandy Dunlap start, metaend - 1); 212ac27a0ecSDave Kleikamp else if (inside(input->inode_table, start, metaend) || 213ac27a0ecSDave Kleikamp inside(itend - 1, start, metaend)) 21412062dddSEric Sandeen ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " 21512062dddSEric Sandeen "(%llu-%llu)", 2161939e49aSRandy Dunlap (unsigned long long)input->inode_table, 2171939e49aSRandy Dunlap itend - 1, start, metaend - 1); 218ac27a0ecSDave Kleikamp else 219ac27a0ecSDave Kleikamp err = 0; 220ac27a0ecSDave Kleikamp brelse(bh); 221ac27a0ecSDave Kleikamp 222ac27a0ecSDave Kleikamp return err; 223ac27a0ecSDave Kleikamp } 224ac27a0ecSDave Kleikamp 22528c7bac0SYongqiang Yang /* 22628c7bac0SYongqiang Yang * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex 22728c7bac0SYongqiang Yang * group each time. 22828c7bac0SYongqiang Yang */ 22928c7bac0SYongqiang Yang struct ext4_new_flex_group_data { 23028c7bac0SYongqiang Yang struct ext4_new_group_data *groups; /* new_group_data for groups 23128c7bac0SYongqiang Yang in the flex group */ 23228c7bac0SYongqiang Yang __u16 *bg_flags; /* block group flags of groups 23328c7bac0SYongqiang Yang in @groups */ 23428c7bac0SYongqiang Yang ext4_group_t count; /* number of groups in @groups 23528c7bac0SYongqiang Yang */ 23628c7bac0SYongqiang Yang }; 23728c7bac0SYongqiang Yang 23828c7bac0SYongqiang Yang /* 23928c7bac0SYongqiang Yang * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of 24028c7bac0SYongqiang Yang * @flexbg_size. 24128c7bac0SYongqiang Yang * 24228c7bac0SYongqiang Yang * Returns NULL on failure otherwise address of the allocated structure. 24328c7bac0SYongqiang Yang */ 24428c7bac0SYongqiang Yang static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) 24528c7bac0SYongqiang Yang { 24628c7bac0SYongqiang Yang struct ext4_new_flex_group_data *flex_gd; 24728c7bac0SYongqiang Yang 24828c7bac0SYongqiang Yang flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); 24928c7bac0SYongqiang Yang if (flex_gd == NULL) 25028c7bac0SYongqiang Yang goto out3; 25128c7bac0SYongqiang Yang 25246901760SInsu Yun if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) 253967ac8afSHaogang Chen goto out2; 25428c7bac0SYongqiang Yang flex_gd->count = flexbg_size; 25528c7bac0SYongqiang Yang 2566da2ec56SKees Cook flex_gd->groups = kmalloc_array(flexbg_size, 2576da2ec56SKees Cook sizeof(struct ext4_new_group_data), 2586da2ec56SKees Cook GFP_NOFS); 25928c7bac0SYongqiang Yang if (flex_gd->groups == NULL) 26028c7bac0SYongqiang Yang goto out2; 26128c7bac0SYongqiang Yang 2626da2ec56SKees Cook flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), 2636da2ec56SKees Cook GFP_NOFS); 26428c7bac0SYongqiang Yang if (flex_gd->bg_flags == NULL) 26528c7bac0SYongqiang Yang goto out1; 26628c7bac0SYongqiang Yang 26728c7bac0SYongqiang Yang return flex_gd; 26828c7bac0SYongqiang Yang 26928c7bac0SYongqiang Yang out1: 27028c7bac0SYongqiang Yang kfree(flex_gd->groups); 27128c7bac0SYongqiang Yang out2: 27228c7bac0SYongqiang Yang kfree(flex_gd); 27328c7bac0SYongqiang Yang out3: 27428c7bac0SYongqiang Yang return NULL; 27528c7bac0SYongqiang Yang } 27628c7bac0SYongqiang Yang 27728c7bac0SYongqiang Yang static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) 27828c7bac0SYongqiang Yang { 27928c7bac0SYongqiang Yang kfree(flex_gd->bg_flags); 28028c7bac0SYongqiang Yang kfree(flex_gd->groups); 28128c7bac0SYongqiang Yang kfree(flex_gd); 28228c7bac0SYongqiang Yang } 28328c7bac0SYongqiang Yang 2843fbea4b3SYongqiang Yang /* 2853fbea4b3SYongqiang Yang * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps 2863fbea4b3SYongqiang Yang * and inode tables for a flex group. 2873fbea4b3SYongqiang Yang * 2883fbea4b3SYongqiang Yang * This function is used by 64bit-resize. Note that this function allocates 2893fbea4b3SYongqiang Yang * group tables from the 1st group of groups contained by @flexgd, which may 2903fbea4b3SYongqiang Yang * be a partial of a flex group. 2913fbea4b3SYongqiang Yang * 2923fbea4b3SYongqiang Yang * @sb: super block of fs to which the groups belongs 29303c1c290SYongqiang Yang * 29403c1c290SYongqiang Yang * Returns 0 on a successful allocation of the metadata blocks in the 29503c1c290SYongqiang Yang * block group. 2963fbea4b3SYongqiang Yang */ 29703c1c290SYongqiang Yang static int ext4_alloc_group_tables(struct super_block *sb, 2983fbea4b3SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 2993fbea4b3SYongqiang Yang int flexbg_size) 3003fbea4b3SYongqiang Yang { 3013fbea4b3SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 3023fbea4b3SYongqiang Yang ext4_fsblk_t start_blk; 3033fbea4b3SYongqiang Yang ext4_fsblk_t last_blk; 3043fbea4b3SYongqiang Yang ext4_group_t src_group; 3053fbea4b3SYongqiang Yang ext4_group_t bb_index = 0; 3063fbea4b3SYongqiang Yang ext4_group_t ib_index = 0; 3073fbea4b3SYongqiang Yang ext4_group_t it_index = 0; 3083fbea4b3SYongqiang Yang ext4_group_t group; 3093fbea4b3SYongqiang Yang ext4_group_t last_group; 3103fbea4b3SYongqiang Yang unsigned overhead; 311b93c9535STheodore Ts'o __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; 312d77147ffSharshads int i; 3133fbea4b3SYongqiang Yang 3143fbea4b3SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 3153fbea4b3SYongqiang Yang 3163fbea4b3SYongqiang Yang src_group = group_data[0].group; 3173fbea4b3SYongqiang Yang last_group = src_group + flex_gd->count - 1; 3183fbea4b3SYongqiang Yang 3193fbea4b3SYongqiang Yang BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != 3203fbea4b3SYongqiang Yang (last_group & ~(flexbg_size - 1)))); 3213fbea4b3SYongqiang Yang next_group: 3223fbea4b3SYongqiang Yang group = group_data[0].group; 32303c1c290SYongqiang Yang if (src_group >= group_data[0].group + flex_gd->count) 32403c1c290SYongqiang Yang return -ENOSPC; 3253fbea4b3SYongqiang Yang start_blk = ext4_group_first_block_no(sb, src_group); 3263fbea4b3SYongqiang Yang last_blk = start_blk + group_data[src_group - group].blocks_count; 3273fbea4b3SYongqiang Yang 32801f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 3293fbea4b3SYongqiang Yang 3303fbea4b3SYongqiang Yang start_blk += overhead; 3313fbea4b3SYongqiang Yang 3323fbea4b3SYongqiang Yang /* We collect contiguous blocks as much as possible. */ 3333fbea4b3SYongqiang Yang src_group++; 33401f795f9SYongqiang Yang for (; src_group <= last_group; src_group++) { 33501f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 336b93c9535STheodore Ts'o if (overhead == 0) 3373fbea4b3SYongqiang Yang last_blk += group_data[src_group - group].blocks_count; 3383fbea4b3SYongqiang Yang else 3393fbea4b3SYongqiang Yang break; 34001f795f9SYongqiang Yang } 3413fbea4b3SYongqiang Yang 3423fbea4b3SYongqiang Yang /* Allocate block bitmaps */ 3433fbea4b3SYongqiang Yang for (; bb_index < flex_gd->count; bb_index++) { 3443fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3453fbea4b3SYongqiang Yang goto next_group; 3463fbea4b3SYongqiang Yang group_data[bb_index].block_bitmap = start_blk++; 347bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3483fbea4b3SYongqiang Yang group -= group_data[0].group; 349d77147ffSharshads group_data[group].mdata_blocks++; 350b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3513fbea4b3SYongqiang Yang } 3523fbea4b3SYongqiang Yang 3533fbea4b3SYongqiang Yang /* Allocate inode bitmaps */ 3543fbea4b3SYongqiang Yang for (; ib_index < flex_gd->count; ib_index++) { 3553fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3563fbea4b3SYongqiang Yang goto next_group; 3573fbea4b3SYongqiang Yang group_data[ib_index].inode_bitmap = start_blk++; 358bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3593fbea4b3SYongqiang Yang group -= group_data[0].group; 360d77147ffSharshads group_data[group].mdata_blocks++; 361b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3623fbea4b3SYongqiang Yang } 3633fbea4b3SYongqiang Yang 3643fbea4b3SYongqiang Yang /* Allocate inode tables */ 3653fbea4b3SYongqiang Yang for (; it_index < flex_gd->count; it_index++) { 366b93c9535STheodore Ts'o unsigned int itb = EXT4_SB(sb)->s_itb_per_group; 367b93c9535STheodore Ts'o ext4_fsblk_t next_group_start; 368b93c9535STheodore Ts'o 369b93c9535STheodore Ts'o if (start_blk + itb > last_blk) 3703fbea4b3SYongqiang Yang goto next_group; 3713fbea4b3SYongqiang Yang group_data[it_index].inode_table = start_blk; 372b93c9535STheodore Ts'o group = ext4_get_group_number(sb, start_blk); 373b93c9535STheodore Ts'o next_group_start = ext4_group_first_block_no(sb, group + 1); 3743fbea4b3SYongqiang Yang group -= group_data[0].group; 3753fbea4b3SYongqiang Yang 376b93c9535STheodore Ts'o if (start_blk + itb > next_group_start) { 377b93c9535STheodore Ts'o flex_gd->bg_flags[group + 1] &= uninit_mask; 378b93c9535STheodore Ts'o overhead = start_blk + itb - next_group_start; 379d77147ffSharshads group_data[group + 1].mdata_blocks += overhead; 380b93c9535STheodore Ts'o itb -= overhead; 381b93c9535STheodore Ts'o } 382b93c9535STheodore Ts'o 383d77147ffSharshads group_data[group].mdata_blocks += itb; 384b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3853fbea4b3SYongqiang Yang start_blk += EXT4_SB(sb)->s_itb_per_group; 3863fbea4b3SYongqiang Yang } 3873fbea4b3SYongqiang Yang 388d77147ffSharshads /* Update free clusters count to exclude metadata blocks */ 389d77147ffSharshads for (i = 0; i < flex_gd->count; i++) { 390d77147ffSharshads group_data[i].free_clusters_count -= 391d77147ffSharshads EXT4_NUM_B2C(EXT4_SB(sb), 392d77147ffSharshads group_data[i].mdata_blocks); 393d77147ffSharshads } 394d77147ffSharshads 3953fbea4b3SYongqiang Yang if (test_opt(sb, DEBUG)) { 3963fbea4b3SYongqiang Yang int i; 3973fbea4b3SYongqiang Yang group = group_data[0].group; 3983fbea4b3SYongqiang Yang 3993fbea4b3SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: adding a flex group with " 4003fbea4b3SYongqiang Yang "%d groups, flexbg size is %d:\n", flex_gd->count, 4013fbea4b3SYongqiang Yang flexbg_size); 4023fbea4b3SYongqiang Yang 4033fbea4b3SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 404d77147ffSharshads ext4_debug( 405d77147ffSharshads "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", 4063fbea4b3SYongqiang Yang ext4_bg_has_super(sb, group + i) ? "normal" : 4073fbea4b3SYongqiang Yang "no-super", group + i, 4083fbea4b3SYongqiang Yang group_data[i].blocks_count, 409d77147ffSharshads group_data[i].free_clusters_count, 410d77147ffSharshads group_data[i].mdata_blocks); 4113fbea4b3SYongqiang Yang } 4123fbea4b3SYongqiang Yang } 41303c1c290SYongqiang Yang return 0; 4143fbea4b3SYongqiang Yang } 4153fbea4b3SYongqiang Yang 416ac27a0ecSDave Kleikamp static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, 417617ba13bSMingming Cao ext4_fsblk_t blk) 418ac27a0ecSDave Kleikamp { 419ac27a0ecSDave Kleikamp struct buffer_head *bh; 420ac27a0ecSDave Kleikamp int err; 421ac27a0ecSDave Kleikamp 422ac27a0ecSDave Kleikamp bh = sb_getblk(sb, blk); 423aebf0243SWang Shilong if (unlikely(!bh)) 424860d21e2STheodore Ts'o return ERR_PTR(-ENOMEM); 4255d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 426188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); 427188c299eSJan Kara if (err) { 428ac27a0ecSDave Kleikamp brelse(bh); 429ac27a0ecSDave Kleikamp bh = ERR_PTR(err); 430ac27a0ecSDave Kleikamp } else { 431ac27a0ecSDave Kleikamp memset(bh->b_data, 0, sb->s_blocksize); 432ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 433ac27a0ecSDave Kleikamp } 434ac27a0ecSDave Kleikamp 435ac27a0ecSDave Kleikamp return bh; 436ac27a0ecSDave Kleikamp } 437ac27a0ecSDave Kleikamp 43883448bdfSJan Kara static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits) 43983448bdfSJan Kara { 44083448bdfSJan Kara return ext4_journal_ensure_credits_fn(handle, credits, 44183448bdfSJan Kara EXT4_MAX_TRANS_DATA, 0, 0); 44283448bdfSJan Kara } 44383448bdfSJan Kara 444ac27a0ecSDave Kleikamp /* 445d77147ffSharshads * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. 44633afdcc5SYongqiang Yang * 44733afdcc5SYongqiang Yang * Helper function for ext4_setup_new_group_blocks() which set . 44833afdcc5SYongqiang Yang * 44933afdcc5SYongqiang Yang * @sb: super block 45033afdcc5SYongqiang Yang * @handle: journal handle 45133afdcc5SYongqiang Yang * @flex_gd: flex group data 45233afdcc5SYongqiang Yang */ 45333afdcc5SYongqiang Yang static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, 45433afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 455d77147ffSharshads ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) 45633afdcc5SYongqiang Yang { 457d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 458d77147ffSharshads ext4_group_t count = last_cluster - first_cluster + 1; 45933afdcc5SYongqiang Yang ext4_group_t count2; 46033afdcc5SYongqiang Yang 461d77147ffSharshads ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, 462d77147ffSharshads last_cluster); 463d77147ffSharshads for (count2 = count; count > 0; 464d77147ffSharshads count -= count2, first_cluster += count2) { 46533afdcc5SYongqiang Yang ext4_fsblk_t start; 46633afdcc5SYongqiang Yang struct buffer_head *bh; 46733afdcc5SYongqiang Yang ext4_group_t group; 46833afdcc5SYongqiang Yang int err; 46933afdcc5SYongqiang Yang 470d77147ffSharshads group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); 471d77147ffSharshads start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); 47233afdcc5SYongqiang Yang group -= flex_gd->groups[0].group; 47333afdcc5SYongqiang Yang 474d77147ffSharshads count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); 47533afdcc5SYongqiang Yang if (count2 > count) 47633afdcc5SYongqiang Yang count2 = count; 47733afdcc5SYongqiang Yang 47833afdcc5SYongqiang Yang if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { 47933afdcc5SYongqiang Yang BUG_ON(flex_gd->count > 1); 48033afdcc5SYongqiang Yang continue; 48133afdcc5SYongqiang Yang } 48233afdcc5SYongqiang Yang 48383448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 484a4130367SJan Kara if (err < 0) 48533afdcc5SYongqiang Yang return err; 48633afdcc5SYongqiang Yang 48733afdcc5SYongqiang Yang bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); 488aebf0243SWang Shilong if (unlikely(!bh)) 489860d21e2STheodore Ts'o return -ENOMEM; 49033afdcc5SYongqiang Yang 4915d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 492188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, 493188c299eSJan Kara EXT4_JTR_NONE); 494cea57941SVasily Averin if (err) { 495cea57941SVasily Averin brelse(bh); 49633afdcc5SYongqiang Yang return err; 497cea57941SVasily Averin } 498d77147ffSharshads ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", 499d77147ffSharshads first_cluster, first_cluster - start, count2); 500123e3016SRitesh Harjani mb_set_bits(bh->b_data, first_cluster - start, count2); 50133afdcc5SYongqiang Yang 50233afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 503cea57941SVasily Averin brelse(bh); 50433afdcc5SYongqiang Yang if (unlikely(err)) 50533afdcc5SYongqiang Yang return err; 50633afdcc5SYongqiang Yang } 50733afdcc5SYongqiang Yang 50833afdcc5SYongqiang Yang return 0; 50933afdcc5SYongqiang Yang } 51033afdcc5SYongqiang Yang 51133afdcc5SYongqiang Yang /* 51233afdcc5SYongqiang Yang * Set up the block and inode bitmaps, and the inode table for the new groups. 51333afdcc5SYongqiang Yang * This doesn't need to be part of the main transaction, since we are only 51433afdcc5SYongqiang Yang * changing blocks outside the actual filesystem. We still do journaling to 51533afdcc5SYongqiang Yang * ensure the recovery is correct in case of a failure just after resize. 51633afdcc5SYongqiang Yang * If any part of this fails, we simply abort the resize. 51733afdcc5SYongqiang Yang * 51833afdcc5SYongqiang Yang * setup_new_flex_group_blocks handles a flex group as follow: 51933afdcc5SYongqiang Yang * 1. copy super block and GDT, and initialize group tables if necessary. 52033afdcc5SYongqiang Yang * In this step, we only set bits in blocks bitmaps for blocks taken by 52133afdcc5SYongqiang Yang * super block and GDT. 52233afdcc5SYongqiang Yang * 2. allocate group tables in block bitmaps, that is, set bits in block 52333afdcc5SYongqiang Yang * bitmap for blocks taken by group tables. 52433afdcc5SYongqiang Yang */ 52533afdcc5SYongqiang Yang static int setup_new_flex_group_blocks(struct super_block *sb, 52633afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 52733afdcc5SYongqiang Yang { 52833afdcc5SYongqiang Yang int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; 52933afdcc5SYongqiang Yang ext4_fsblk_t start; 53033afdcc5SYongqiang Yang ext4_fsblk_t block; 53133afdcc5SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 53233afdcc5SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 53333afdcc5SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 53433afdcc5SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 53533afdcc5SYongqiang Yang handle_t *handle; 53633afdcc5SYongqiang Yang ext4_group_t group, count; 53733afdcc5SYongqiang Yang struct buffer_head *bh = NULL; 53833afdcc5SYongqiang Yang int reserved_gdb, i, j, err = 0, err2; 53901f795f9SYongqiang Yang int meta_bg; 54033afdcc5SYongqiang Yang 54133afdcc5SYongqiang Yang BUG_ON(!flex_gd->count || !group_data || 54233afdcc5SYongqiang Yang group_data[0].group != sbi->s_groups_count); 54333afdcc5SYongqiang Yang 54433afdcc5SYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 545e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 54633afdcc5SYongqiang Yang 54733afdcc5SYongqiang Yang /* This transaction may be extended/restarted along the way */ 5489924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 54933afdcc5SYongqiang Yang if (IS_ERR(handle)) 55033afdcc5SYongqiang Yang return PTR_ERR(handle); 55133afdcc5SYongqiang Yang 55233afdcc5SYongqiang Yang group = group_data[0].group; 55333afdcc5SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group++) { 55433afdcc5SYongqiang Yang unsigned long gdblocks; 55501f795f9SYongqiang Yang ext4_grpblk_t overhead; 55633afdcc5SYongqiang Yang 55733afdcc5SYongqiang Yang gdblocks = ext4_bg_num_gdb(sb, group); 55833afdcc5SYongqiang Yang start = ext4_group_first_block_no(sb, group); 55933afdcc5SYongqiang Yang 56001f795f9SYongqiang Yang if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) 5616df935adSYongqiang Yang goto handle_itb; 5626df935adSYongqiang Yang 563*b88c91b2SKemeng Shi if (meta_bg == 1) 56401f795f9SYongqiang Yang goto handle_itb; 56501f795f9SYongqiang Yang 56601f795f9SYongqiang Yang block = start + ext4_bg_has_super(sb, group); 56733afdcc5SYongqiang Yang /* Copy all of the GDT blocks into the backup in this group */ 56801f795f9SYongqiang Yang for (j = 0; j < gdblocks; j++, block++) { 56933afdcc5SYongqiang Yang struct buffer_head *gdb; 57033afdcc5SYongqiang Yang 57133afdcc5SYongqiang Yang ext4_debug("update backup group %#04llx\n", block); 57283448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 573a4130367SJan Kara if (err < 0) 57433afdcc5SYongqiang Yang goto out; 57533afdcc5SYongqiang Yang 57633afdcc5SYongqiang Yang gdb = sb_getblk(sb, block); 577aebf0243SWang Shilong if (unlikely(!gdb)) { 578860d21e2STheodore Ts'o err = -ENOMEM; 57933afdcc5SYongqiang Yang goto out; 58033afdcc5SYongqiang Yang } 58133afdcc5SYongqiang Yang 5825d601255Sliang xie BUFFER_TRACE(gdb, "get_write_access"); 583188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb, 584188c299eSJan Kara EXT4_JTR_NONE); 58533afdcc5SYongqiang Yang if (err) { 58633afdcc5SYongqiang Yang brelse(gdb); 58733afdcc5SYongqiang Yang goto out; 58833afdcc5SYongqiang Yang } 5891d0c3924STheodore Ts'o memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, 5901d0c3924STheodore Ts'o s_group_desc, j)->b_data, gdb->b_size); 59133afdcc5SYongqiang Yang set_buffer_uptodate(gdb); 59233afdcc5SYongqiang Yang 59333afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb); 59433afdcc5SYongqiang Yang if (unlikely(err)) { 59533afdcc5SYongqiang Yang brelse(gdb); 59633afdcc5SYongqiang Yang goto out; 59733afdcc5SYongqiang Yang } 59833afdcc5SYongqiang Yang brelse(gdb); 59933afdcc5SYongqiang Yang } 60033afdcc5SYongqiang Yang 60133afdcc5SYongqiang Yang /* Zero out all of the reserved backup group descriptor 60233afdcc5SYongqiang Yang * table blocks 60333afdcc5SYongqiang Yang */ 60433afdcc5SYongqiang Yang if (ext4_bg_has_super(sb, group)) { 60533afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, gdblocks + start + 1, 60633afdcc5SYongqiang Yang reserved_gdb, GFP_NOFS); 60733afdcc5SYongqiang Yang if (err) 60833afdcc5SYongqiang Yang goto out; 60933afdcc5SYongqiang Yang } 61033afdcc5SYongqiang Yang 6116df935adSYongqiang Yang handle_itb: 61233afdcc5SYongqiang Yang /* Initialize group tables of the grop @group */ 61333afdcc5SYongqiang Yang if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) 61433afdcc5SYongqiang Yang goto handle_bb; 61533afdcc5SYongqiang Yang 61633afdcc5SYongqiang Yang /* Zero out all of the inode table blocks */ 61733afdcc5SYongqiang Yang block = group_data[i].inode_table; 61833afdcc5SYongqiang Yang ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", 61933afdcc5SYongqiang Yang block, sbi->s_itb_per_group); 62033afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, 62133afdcc5SYongqiang Yang GFP_NOFS); 62233afdcc5SYongqiang Yang if (err) 62333afdcc5SYongqiang Yang goto out; 62433afdcc5SYongqiang Yang 62533afdcc5SYongqiang Yang handle_bb: 62633afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) 62733afdcc5SYongqiang Yang goto handle_ib; 62833afdcc5SYongqiang Yang 62933afdcc5SYongqiang Yang /* Initialize block bitmap of the @group */ 63033afdcc5SYongqiang Yang block = group_data[i].block_bitmap; 63183448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 632a4130367SJan Kara if (err < 0) 63333afdcc5SYongqiang Yang goto out; 63433afdcc5SYongqiang Yang 63533afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 63633afdcc5SYongqiang Yang if (IS_ERR(bh)) { 63733afdcc5SYongqiang Yang err = PTR_ERR(bh); 63833afdcc5SYongqiang Yang goto out; 63933afdcc5SYongqiang Yang } 64001f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group); 64101f795f9SYongqiang Yang if (overhead != 0) { 64233afdcc5SYongqiang Yang ext4_debug("mark backup superblock %#04llx (+0)\n", 64333afdcc5SYongqiang Yang start); 644123e3016SRitesh Harjani mb_set_bits(bh->b_data, 0, 645d77147ffSharshads EXT4_NUM_B2C(sbi, overhead)); 64633afdcc5SYongqiang Yang } 647d77147ffSharshads ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), 64833afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 64933afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6509e402893SVasily Averin brelse(bh); 65133afdcc5SYongqiang Yang if (err) 65233afdcc5SYongqiang Yang goto out; 65333afdcc5SYongqiang Yang 65433afdcc5SYongqiang Yang handle_ib: 65533afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_INODE_UNINIT) 65633afdcc5SYongqiang Yang continue; 65733afdcc5SYongqiang Yang 65833afdcc5SYongqiang Yang /* Initialize inode bitmap of the @group */ 65933afdcc5SYongqiang Yang block = group_data[i].inode_bitmap; 66083448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 661a4130367SJan Kara if (err < 0) 66233afdcc5SYongqiang Yang goto out; 66333afdcc5SYongqiang Yang /* Mark unused entries in inode bitmap used */ 66433afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 66533afdcc5SYongqiang Yang if (IS_ERR(bh)) { 66633afdcc5SYongqiang Yang err = PTR_ERR(bh); 66733afdcc5SYongqiang Yang goto out; 66833afdcc5SYongqiang Yang } 66933afdcc5SYongqiang Yang 67033afdcc5SYongqiang Yang ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), 67133afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 67233afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6739e402893SVasily Averin brelse(bh); 67433afdcc5SYongqiang Yang if (err) 67533afdcc5SYongqiang Yang goto out; 67633afdcc5SYongqiang Yang } 67733afdcc5SYongqiang Yang 67833afdcc5SYongqiang Yang /* Mark group tables in block bitmap */ 67933afdcc5SYongqiang Yang for (j = 0; j < GROUP_TABLE_COUNT; j++) { 68033afdcc5SYongqiang Yang count = group_table_count[j]; 68133afdcc5SYongqiang Yang start = (&group_data[0].block_bitmap)[j]; 68233afdcc5SYongqiang Yang block = start; 68333afdcc5SYongqiang Yang for (i = 1; i < flex_gd->count; i++) { 68433afdcc5SYongqiang Yang block += group_table_count[j]; 68533afdcc5SYongqiang Yang if (block == (&group_data[i].block_bitmap)[j]) { 68633afdcc5SYongqiang Yang count += group_table_count[j]; 68733afdcc5SYongqiang Yang continue; 68833afdcc5SYongqiang Yang } 68933afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 690d77147ffSharshads flex_gd, 691d77147ffSharshads EXT4_B2C(sbi, start), 692d77147ffSharshads EXT4_B2C(sbi, 693d77147ffSharshads start + count 694d77147ffSharshads - 1)); 69533afdcc5SYongqiang Yang if (err) 69633afdcc5SYongqiang Yang goto out; 69733afdcc5SYongqiang Yang count = group_table_count[j]; 698b93c9535STheodore Ts'o start = (&group_data[i].block_bitmap)[j]; 69933afdcc5SYongqiang Yang block = start; 70033afdcc5SYongqiang Yang } 70133afdcc5SYongqiang Yang 70233afdcc5SYongqiang Yang if (count) { 70333afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 704d77147ffSharshads flex_gd, 705d77147ffSharshads EXT4_B2C(sbi, start), 706d77147ffSharshads EXT4_B2C(sbi, 707d77147ffSharshads start + count 708d77147ffSharshads - 1)); 70933afdcc5SYongqiang Yang if (err) 71033afdcc5SYongqiang Yang goto out; 71133afdcc5SYongqiang Yang } 71233afdcc5SYongqiang Yang } 71333afdcc5SYongqiang Yang 71433afdcc5SYongqiang Yang out: 71533afdcc5SYongqiang Yang err2 = ext4_journal_stop(handle); 71633afdcc5SYongqiang Yang if (err2 && !err) 71733afdcc5SYongqiang Yang err = err2; 71833afdcc5SYongqiang Yang 71933afdcc5SYongqiang Yang return err; 72033afdcc5SYongqiang Yang } 72133afdcc5SYongqiang Yang 72233afdcc5SYongqiang Yang /* 723ac27a0ecSDave Kleikamp * Iterate through the groups which hold BACKUP superblock/GDT copies in an 724617ba13bSMingming Cao * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before 725ac27a0ecSDave Kleikamp * calling this for the first time. In a sparse filesystem it will be the 726ac27a0ecSDave Kleikamp * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... 727ac27a0ecSDave Kleikamp * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... 728ac27a0ecSDave Kleikamp */ 729bbc605cdSLukas Czerner unsigned int ext4_list_backups(struct super_block *sb, unsigned int *three, 730bbc605cdSLukas Czerner unsigned int *five, unsigned int *seven) 731ac27a0ecSDave Kleikamp { 732bbc605cdSLukas Czerner struct ext4_super_block *es = EXT4_SB(sb)->s_es; 733bbc605cdSLukas Czerner unsigned int *min = three; 734ac27a0ecSDave Kleikamp int mult = 3; 735bbc605cdSLukas Czerner unsigned int ret; 736bbc605cdSLukas Czerner 737bbc605cdSLukas Czerner if (ext4_has_feature_sparse_super2(sb)) { 738bbc605cdSLukas Czerner do { 739bbc605cdSLukas Czerner if (*min > 2) 740bbc605cdSLukas Czerner return UINT_MAX; 741bbc605cdSLukas Czerner ret = le32_to_cpu(es->s_backup_bgs[*min - 1]); 742bbc605cdSLukas Czerner *min += 1; 743bbc605cdSLukas Czerner } while (!ret); 744bbc605cdSLukas Czerner return ret; 745bbc605cdSLukas Czerner } 746ac27a0ecSDave Kleikamp 747e2b911c5SDarrick J. Wong if (!ext4_has_feature_sparse_super(sb)) { 748ac27a0ecSDave Kleikamp ret = *min; 749ac27a0ecSDave Kleikamp *min += 1; 750ac27a0ecSDave Kleikamp return ret; 751ac27a0ecSDave Kleikamp } 752ac27a0ecSDave Kleikamp 753ac27a0ecSDave Kleikamp if (*five < *min) { 754ac27a0ecSDave Kleikamp min = five; 755ac27a0ecSDave Kleikamp mult = 5; 756ac27a0ecSDave Kleikamp } 757ac27a0ecSDave Kleikamp if (*seven < *min) { 758ac27a0ecSDave Kleikamp min = seven; 759ac27a0ecSDave Kleikamp mult = 7; 760ac27a0ecSDave Kleikamp } 761ac27a0ecSDave Kleikamp 762ac27a0ecSDave Kleikamp ret = *min; 763ac27a0ecSDave Kleikamp *min *= mult; 764ac27a0ecSDave Kleikamp 765ac27a0ecSDave Kleikamp return ret; 766ac27a0ecSDave Kleikamp } 767ac27a0ecSDave Kleikamp 768ac27a0ecSDave Kleikamp /* 769ac27a0ecSDave Kleikamp * Check that all of the backup GDT blocks are held in the primary GDT block. 770ac27a0ecSDave Kleikamp * It is assumed that they are stored in group order. Returns the number of 771ac27a0ecSDave Kleikamp * groups in current filesystem that have BACKUPS, or -ve error code. 772ac27a0ecSDave Kleikamp */ 773ac27a0ecSDave Kleikamp static int verify_reserved_gdb(struct super_block *sb, 774c72df9f9SYongqiang Yang ext4_group_t end, 775ac27a0ecSDave Kleikamp struct buffer_head *primary) 776ac27a0ecSDave Kleikamp { 777617ba13bSMingming Cao const ext4_fsblk_t blk = primary->b_blocknr; 778ac27a0ecSDave Kleikamp unsigned three = 1; 779ac27a0ecSDave Kleikamp unsigned five = 5; 780ac27a0ecSDave Kleikamp unsigned seven = 7; 781ac27a0ecSDave Kleikamp unsigned grp; 782ac27a0ecSDave Kleikamp __le32 *p = (__le32 *)primary->b_data; 783ac27a0ecSDave Kleikamp int gdbackups = 0; 784ac27a0ecSDave Kleikamp 785617ba13bSMingming Cao while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { 786bd81d8eeSLaurent Vivier if (le32_to_cpu(*p++) != 787bd81d8eeSLaurent Vivier grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ 78812062dddSEric Sandeen ext4_warning(sb, "reserved GDT %llu" 7892ae02107SMingming Cao " missing grp %d (%llu)", 790ac27a0ecSDave Kleikamp blk, grp, 791bd81d8eeSLaurent Vivier grp * 792bd81d8eeSLaurent Vivier (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 793bd81d8eeSLaurent Vivier blk); 794ac27a0ecSDave Kleikamp return -EINVAL; 795ac27a0ecSDave Kleikamp } 796617ba13bSMingming Cao if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) 797ac27a0ecSDave Kleikamp return -EFBIG; 798ac27a0ecSDave Kleikamp } 799ac27a0ecSDave Kleikamp 800ac27a0ecSDave Kleikamp return gdbackups; 801ac27a0ecSDave Kleikamp } 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp /* 804ac27a0ecSDave Kleikamp * Called when we need to bring a reserved group descriptor table block into 805ac27a0ecSDave Kleikamp * use from the resize inode. The primary copy of the new GDT block currently 806ac27a0ecSDave Kleikamp * is an indirect block (under the double indirect block in the resize inode). 807ac27a0ecSDave Kleikamp * The new backup GDT blocks will be stored as leaf blocks in this indirect 808ac27a0ecSDave Kleikamp * block, in group order. Even though we know all the block numbers we need, 809ac27a0ecSDave Kleikamp * we check to ensure that the resize inode has actually reserved these blocks. 810ac27a0ecSDave Kleikamp * 811ac27a0ecSDave Kleikamp * Don't need to update the block bitmaps because the blocks are still in use. 812ac27a0ecSDave Kleikamp * 813ac27a0ecSDave Kleikamp * We get all of the error cases out of the way, so that we are sure to not 814ac27a0ecSDave Kleikamp * fail once we start modifying the data on disk, because JBD has no rollback. 815ac27a0ecSDave Kleikamp */ 816ac27a0ecSDave Kleikamp static int add_new_gdb(handle_t *handle, struct inode *inode, 8172f919710SYongqiang Yang ext4_group_t group) 818ac27a0ecSDave Kleikamp { 819ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 820617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 8212f919710SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 822617ba13bSMingming Cao ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; 823fb265c9cSTheodore Ts'o struct buffer_head **o_group_desc, **n_group_desc = NULL; 824fb265c9cSTheodore Ts'o struct buffer_head *dind = NULL; 825fb265c9cSTheodore Ts'o struct buffer_head *gdb_bh = NULL; 826ac27a0ecSDave Kleikamp int gdbackups; 827fb265c9cSTheodore Ts'o struct ext4_iloc iloc = { .bh = NULL }; 828ac27a0ecSDave Kleikamp __le32 *data; 829ac27a0ecSDave Kleikamp int err; 830ac27a0ecSDave Kleikamp 831ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 832ac27a0ecSDave Kleikamp printk(KERN_DEBUG 833617ba13bSMingming Cao "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", 834ac27a0ecSDave Kleikamp gdb_num); 835ac27a0ecSDave Kleikamp 836fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 837fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 838fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 839ac27a0ecSDave Kleikamp 840c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, gdb_bh); 8412f919710SYongqiang Yang if (gdbackups < 0) { 842ac27a0ecSDave Kleikamp err = gdbackups; 843fb265c9cSTheodore Ts'o goto errout; 844ac27a0ecSDave Kleikamp } 845ac27a0ecSDave Kleikamp 846617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 847fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 848fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 849fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 850fb265c9cSTheodore Ts'o dind = NULL; 851fb265c9cSTheodore Ts'o goto errout; 852ac27a0ecSDave Kleikamp } 853ac27a0ecSDave Kleikamp 854ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 855617ba13bSMingming Cao if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { 85612062dddSEric Sandeen ext4_warning(sb, "new group %u GDT block %llu not reserved", 8572f919710SYongqiang Yang group, gdblock); 858ac27a0ecSDave Kleikamp err = -EINVAL; 859fb265c9cSTheodore Ts'o goto errout; 860ac27a0ecSDave Kleikamp } 861ac27a0ecSDave Kleikamp 8625d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 863188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 864188c299eSJan Kara EXT4_JTR_NONE); 865b4097142STheodore Ts'o if (unlikely(err)) 866fb265c9cSTheodore Ts'o goto errout; 867ac27a0ecSDave Kleikamp 8685d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 869188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 870b4097142STheodore Ts'o if (unlikely(err)) 871fb265c9cSTheodore Ts'o goto errout; 872ac27a0ecSDave Kleikamp 8735d601255Sliang xie BUFFER_TRACE(dind, "get_write_access"); 874188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, dind, EXT4_JTR_NONE); 875c9e87161SDinghao Liu if (unlikely(err)) { 876b4097142STheodore Ts'o ext4_std_error(sb, err); 877c9e87161SDinghao Liu goto errout; 878c9e87161SDinghao Liu } 879ac27a0ecSDave Kleikamp 880617ba13bSMingming Cao /* ext4_reserve_inode_write() gets a reference on the iloc */ 881b4097142STheodore Ts'o err = ext4_reserve_inode_write(handle, inode, &iloc); 882b4097142STheodore Ts'o if (unlikely(err)) 883fb265c9cSTheodore Ts'o goto errout; 884ac27a0ecSDave Kleikamp 88571b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 88671b565ceSTheodore Ts'o GFP_KERNEL); 887ac27a0ecSDave Kleikamp if (!n_group_desc) { 888ac27a0ecSDave Kleikamp err = -ENOMEM; 889f18a5f21STheodore Ts'o ext4_warning(sb, "not enough memory for %lu groups", 890f18a5f21STheodore Ts'o gdb_num + 1); 891fb265c9cSTheodore Ts'o goto errout; 892ac27a0ecSDave Kleikamp } 893ac27a0ecSDave Kleikamp 894ac27a0ecSDave Kleikamp /* 895ac27a0ecSDave Kleikamp * Finally, we have all of the possible failures behind us... 896ac27a0ecSDave Kleikamp * 897ac27a0ecSDave Kleikamp * Remove new GDT block from inode double-indirect block and clear out 898ac27a0ecSDave Kleikamp * the new GDT block for use (which also "frees" the backup GDT blocks 899ac27a0ecSDave Kleikamp * from the reserved inode). We don't need to change the bitmaps for 900ac27a0ecSDave Kleikamp * these blocks, because they are marked as in-use from being in the 901ac27a0ecSDave Kleikamp * reserved inode, and will become GDT blocks (primary and backup). 902ac27a0ecSDave Kleikamp */ 903617ba13bSMingming Cao data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; 904b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, dind); 905b4097142STheodore Ts'o if (unlikely(err)) { 906b4097142STheodore Ts'o ext4_std_error(sb, err); 907fb265c9cSTheodore Ts'o goto errout; 908b4097142STheodore Ts'o } 909d77147ffSharshads inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 910d77147ffSharshads (9 - EXT4_SB(sb)->s_cluster_bits); 911617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 9122f919710SYongqiang Yang memset(gdb_bh->b_data, 0, sb->s_blocksize); 9132f919710SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 914b4097142STheodore Ts'o if (unlikely(err)) { 915b4097142STheodore Ts'o ext4_std_error(sb, err); 9168c380ab4SPan Bian iloc.bh = NULL; 917fb265c9cSTheodore Ts'o goto errout; 918b4097142STheodore Ts'o } 919b4097142STheodore Ts'o brelse(dind); 920ac27a0ecSDave Kleikamp 9211d0c3924STheodore Ts'o rcu_read_lock(); 9221d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 923ac27a0ecSDave Kleikamp memcpy(n_group_desc, o_group_desc, 924617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9251d0c3924STheodore Ts'o rcu_read_unlock(); 9262f919710SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 9271d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 928617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count++; 9291d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 930ac27a0ecSDave Kleikamp 93105c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 932e8546d06SMarcin Slusarz le16_add_cpu(&es->s_reserved_gdt_blocks, -1); 93305c2c00fSJan Kara ext4_superblock_csum_set(sb); 93405c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 935a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 936b4097142STheodore Ts'o if (err) 937b4097142STheodore Ts'o ext4_std_error(sb, err); 938b4097142STheodore Ts'o return err; 939fb265c9cSTheodore Ts'o errout: 940b93b41d4SAl Viro kvfree(n_group_desc); 941ac27a0ecSDave Kleikamp brelse(iloc.bh); 942ac27a0ecSDave Kleikamp brelse(dind); 9432f919710SYongqiang Yang brelse(gdb_bh); 944ac27a0ecSDave Kleikamp 945617ba13bSMingming Cao ext4_debug("leaving with error %d\n", err); 946ac27a0ecSDave Kleikamp return err; 947ac27a0ecSDave Kleikamp } 948ac27a0ecSDave Kleikamp 949ac27a0ecSDave Kleikamp /* 95001f795f9SYongqiang Yang * add_new_gdb_meta_bg is the sister of add_new_gdb. 95101f795f9SYongqiang Yang */ 95201f795f9SYongqiang Yang static int add_new_gdb_meta_bg(struct super_block *sb, 95301f795f9SYongqiang Yang handle_t *handle, ext4_group_t group) { 95401f795f9SYongqiang Yang ext4_fsblk_t gdblock; 95501f795f9SYongqiang Yang struct buffer_head *gdb_bh; 95601f795f9SYongqiang Yang struct buffer_head **o_group_desc, **n_group_desc; 95701f795f9SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 95801f795f9SYongqiang Yang int err; 95901f795f9SYongqiang Yang 96001f795f9SYongqiang Yang gdblock = ext4_meta_bg_first_block_no(sb, group) + 96101f795f9SYongqiang Yang ext4_bg_has_super(sb, group); 962fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 963fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 964fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 96571b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 96671b565ceSTheodore Ts'o GFP_KERNEL); 96701f795f9SYongqiang Yang if (!n_group_desc) { 96861a9c11eSVasily Averin brelse(gdb_bh); 96901f795f9SYongqiang Yang err = -ENOMEM; 97001f795f9SYongqiang Yang ext4_warning(sb, "not enough memory for %lu groups", 97101f795f9SYongqiang Yang gdb_num + 1); 97201f795f9SYongqiang Yang return err; 97301f795f9SYongqiang Yang } 97401f795f9SYongqiang Yang 9751d0c3924STheodore Ts'o rcu_read_lock(); 9761d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 97701f795f9SYongqiang Yang memcpy(n_group_desc, o_group_desc, 97801f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9791d0c3924STheodore Ts'o rcu_read_unlock(); 98001f795f9SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 981d64264d6SLukas Czerner 982d64264d6SLukas Czerner BUFFER_TRACE(gdb_bh, "get_write_access"); 983188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 984d64264d6SLukas Czerner if (err) { 985d64264d6SLukas Czerner kvfree(n_group_desc); 986d64264d6SLukas Czerner brelse(gdb_bh); 987d64264d6SLukas Czerner return err; 988d64264d6SLukas Czerner } 989d64264d6SLukas Czerner 9901d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 99101f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count++; 9921d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 99301f795f9SYongqiang Yang return err; 99401f795f9SYongqiang Yang } 99501f795f9SYongqiang Yang 99601f795f9SYongqiang Yang /* 997ac27a0ecSDave Kleikamp * Called when we are adding a new group which has a backup copy of each of 998ac27a0ecSDave Kleikamp * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. 999ac27a0ecSDave Kleikamp * We need to add these reserved backup GDT blocks to the resize inode, so 1000ac27a0ecSDave Kleikamp * that they are kept for future resizing and not allocated to files. 1001ac27a0ecSDave Kleikamp * 1002ac27a0ecSDave Kleikamp * Each reserved backup GDT block will go into a different indirect block. 1003ac27a0ecSDave Kleikamp * The indirect blocks are actually the primary reserved GDT blocks, 1004ac27a0ecSDave Kleikamp * so we know in advance what their block numbers are. We only get the 1005ac27a0ecSDave Kleikamp * double-indirect block to verify it is pointing to the primary reserved 1006ac27a0ecSDave Kleikamp * GDT blocks so we don't overwrite a data block by accident. The reserved 1007ac27a0ecSDave Kleikamp * backup GDT blocks are stored in their reserved primary GDT block. 1008ac27a0ecSDave Kleikamp */ 1009ac27a0ecSDave Kleikamp static int reserve_backup_gdb(handle_t *handle, struct inode *inode, 1010668f4dc5SYongqiang Yang ext4_group_t group) 1011ac27a0ecSDave Kleikamp { 1012ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1013617ba13bSMingming Cao int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 1014d77147ffSharshads int cluster_bits = EXT4_SB(sb)->s_cluster_bits; 1015ac27a0ecSDave Kleikamp struct buffer_head **primary; 1016ac27a0ecSDave Kleikamp struct buffer_head *dind; 1017617ba13bSMingming Cao struct ext4_iloc iloc; 1018617ba13bSMingming Cao ext4_fsblk_t blk; 1019ac27a0ecSDave Kleikamp __le32 *data, *end; 1020ac27a0ecSDave Kleikamp int gdbackups = 0; 1021ac27a0ecSDave Kleikamp int res, i; 1022ac27a0ecSDave Kleikamp int err; 1023ac27a0ecSDave Kleikamp 10246da2ec56SKees Cook primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); 1025ac27a0ecSDave Kleikamp if (!primary) 1026ac27a0ecSDave Kleikamp return -ENOMEM; 1027ac27a0ecSDave Kleikamp 1028617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 1029fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 1030fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 1031fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 1032fb265c9cSTheodore Ts'o dind = NULL; 1033ac27a0ecSDave Kleikamp goto exit_free; 1034ac27a0ecSDave Kleikamp } 1035ac27a0ecSDave Kleikamp 1036617ba13bSMingming Cao blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; 103794460093SJosef Bacik data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % 103894460093SJosef Bacik EXT4_ADDR_PER_BLOCK(sb)); 1039617ba13bSMingming Cao end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); 1040ac27a0ecSDave Kleikamp 1041ac27a0ecSDave Kleikamp /* Get each reserved primary GDT block and verify it holds backups */ 1042ac27a0ecSDave Kleikamp for (res = 0; res < reserved_gdb; res++, blk++) { 1043ac27a0ecSDave Kleikamp if (le32_to_cpu(*data) != blk) { 104412062dddSEric Sandeen ext4_warning(sb, "reserved block %llu" 1045ac27a0ecSDave Kleikamp " not at offset %ld", 1046ac27a0ecSDave Kleikamp blk, 1047ac27a0ecSDave Kleikamp (long)(data - (__le32 *)dind->b_data)); 1048ac27a0ecSDave Kleikamp err = -EINVAL; 1049ac27a0ecSDave Kleikamp goto exit_bh; 1050ac27a0ecSDave Kleikamp } 1051fb265c9cSTheodore Ts'o primary[res] = ext4_sb_bread(sb, blk, 0); 1052fb265c9cSTheodore Ts'o if (IS_ERR(primary[res])) { 1053fb265c9cSTheodore Ts'o err = PTR_ERR(primary[res]); 1054fb265c9cSTheodore Ts'o primary[res] = NULL; 1055ac27a0ecSDave Kleikamp goto exit_bh; 1056ac27a0ecSDave Kleikamp } 1057c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, primary[res]); 1058c72df9f9SYongqiang Yang if (gdbackups < 0) { 1059ac27a0ecSDave Kleikamp brelse(primary[res]); 1060ac27a0ecSDave Kleikamp err = gdbackups; 1061ac27a0ecSDave Kleikamp goto exit_bh; 1062ac27a0ecSDave Kleikamp } 1063ac27a0ecSDave Kleikamp if (++data >= end) 1064ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 1065ac27a0ecSDave Kleikamp } 1066ac27a0ecSDave Kleikamp 1067ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 10685d601255Sliang xie BUFFER_TRACE(primary[i], "get_write_access"); 1069188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, primary[i], 1070188c299eSJan Kara EXT4_JTR_NONE))) 1071ac27a0ecSDave Kleikamp goto exit_bh; 1072ac27a0ecSDave Kleikamp } 1073ac27a0ecSDave Kleikamp 1074617ba13bSMingming Cao if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) 1075ac27a0ecSDave Kleikamp goto exit_bh; 1076ac27a0ecSDave Kleikamp 1077ac27a0ecSDave Kleikamp /* 1078ac27a0ecSDave Kleikamp * Finally we can add each of the reserved backup GDT blocks from 1079ac27a0ecSDave Kleikamp * the new group to its reserved primary GDT block. 1080ac27a0ecSDave Kleikamp */ 1081668f4dc5SYongqiang Yang blk = group * EXT4_BLOCKS_PER_GROUP(sb); 1082ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 1083ac27a0ecSDave Kleikamp int err2; 1084ac27a0ecSDave Kleikamp data = (__le32 *)primary[i]->b_data; 1085ac27a0ecSDave Kleikamp /* printk("reserving backup %lu[%u] = %lu\n", 1086ac27a0ecSDave Kleikamp primary[i]->b_blocknr, gdbackups, 1087ac27a0ecSDave Kleikamp blk + primary[i]->b_blocknr); */ 1088ac27a0ecSDave Kleikamp data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); 10890390131bSFrank Mayhar err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); 1090ac27a0ecSDave Kleikamp if (!err) 1091ac27a0ecSDave Kleikamp err = err2; 1092ac27a0ecSDave Kleikamp } 1093d77147ffSharshads 1094d77147ffSharshads inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); 1095617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 1096ac27a0ecSDave Kleikamp 1097ac27a0ecSDave Kleikamp exit_bh: 1098ac27a0ecSDave Kleikamp while (--res >= 0) 1099ac27a0ecSDave Kleikamp brelse(primary[res]); 1100ac27a0ecSDave Kleikamp brelse(dind); 1101ac27a0ecSDave Kleikamp 1102ac27a0ecSDave Kleikamp exit_free: 1103ac27a0ecSDave Kleikamp kfree(primary); 1104ac27a0ecSDave Kleikamp 1105ac27a0ecSDave Kleikamp return err; 1106ac27a0ecSDave Kleikamp } 1107ac27a0ecSDave Kleikamp 11088f49ec60SBaokun Li static inline void ext4_set_block_group_nr(struct super_block *sb, char *data, 11098f49ec60SBaokun Li ext4_group_t group) 11108f49ec60SBaokun Li { 11118f49ec60SBaokun Li struct ext4_super_block *es = (struct ext4_super_block *) data; 11128f49ec60SBaokun Li 11138f49ec60SBaokun Li es->s_block_group_nr = cpu_to_le16(group); 11148f49ec60SBaokun Li if (ext4_has_metadata_csum(sb)) 11158f49ec60SBaokun Li es->s_checksum = ext4_superblock_csum(sb, es); 11168f49ec60SBaokun Li } 11178f49ec60SBaokun Li 1118ac27a0ecSDave Kleikamp /* 1119617ba13bSMingming Cao * Update the backup copies of the ext4 metadata. These don't need to be part 1120ac27a0ecSDave Kleikamp * of the main resize transaction, because e2fsck will re-write them if there 1121ac27a0ecSDave Kleikamp * is a problem (basically only OOM will cause a problem). However, we 1122ac27a0ecSDave Kleikamp * _should_ update the backups if possible, in case the primary gets trashed 1123ac27a0ecSDave Kleikamp * for some reason and we need to run e2fsck from a backup superblock. The 1124ac27a0ecSDave Kleikamp * important part is that the new block and inode counts are in the backup 1125ac27a0ecSDave Kleikamp * superblocks, and the location of the new group metadata in the GDT backups. 1126ac27a0ecSDave Kleikamp * 112732ed5058STheodore Ts'o * We do not need take the s_resize_lock for this, because these 112832ed5058STheodore Ts'o * blocks are not otherwise touched by the filesystem code when it is 112932ed5058STheodore Ts'o * mounted. We don't need to worry about last changing from 113032ed5058STheodore Ts'o * sbi->s_groups_count, because the worst that can happen is that we 113132ed5058STheodore Ts'o * do not copy the full number of backups at this time. The resize 113232ed5058STheodore Ts'o * which changed s_groups_count will backup again. 1133ac27a0ecSDave Kleikamp */ 1134904dad47SAndy Leiserson static void update_backups(struct super_block *sb, sector_t blk_off, char *data, 113501f795f9SYongqiang Yang int size, int meta_bg) 1136ac27a0ecSDave Kleikamp { 1137617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 113801f795f9SYongqiang Yang ext4_group_t last; 1139617ba13bSMingming Cao const int bpg = EXT4_BLOCKS_PER_GROUP(sb); 1140ac27a0ecSDave Kleikamp unsigned three = 1; 1141ac27a0ecSDave Kleikamp unsigned five = 5; 1142ac27a0ecSDave Kleikamp unsigned seven = 7; 114301f795f9SYongqiang Yang ext4_group_t group = 0; 1144ac27a0ecSDave Kleikamp int rest = sb->s_blocksize - size; 1145ac27a0ecSDave Kleikamp handle_t *handle; 1146ac27a0ecSDave Kleikamp int err = 0, err2; 1147ac27a0ecSDave Kleikamp 11489924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 1149ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1150ac27a0ecSDave Kleikamp group = 1; 1151ac27a0ecSDave Kleikamp err = PTR_ERR(handle); 1152ac27a0ecSDave Kleikamp goto exit_err; 1153ac27a0ecSDave Kleikamp } 1154ac27a0ecSDave Kleikamp 115501f795f9SYongqiang Yang if (meta_bg == 0) { 115601f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 115701f795f9SYongqiang Yang last = sbi->s_groups_count; 115801f795f9SYongqiang Yang } else { 1159904dad47SAndy Leiserson group = ext4_get_group_number(sb, blk_off) + 1; 116001f795f9SYongqiang Yang last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); 116101f795f9SYongqiang Yang } 116201f795f9SYongqiang Yang 116301f795f9SYongqiang Yang while (group < sbi->s_groups_count) { 1164ac27a0ecSDave Kleikamp struct buffer_head *bh; 116501f795f9SYongqiang Yang ext4_fsblk_t backup_block; 11668f49ec60SBaokun Li int has_super = ext4_bg_has_super(sb, group); 11678f49ec60SBaokun Li ext4_fsblk_t first_block = ext4_group_first_block_no(sb, group); 1168ac27a0ecSDave Kleikamp 1169ac27a0ecSDave Kleikamp /* Out of journal space, and can't get more - abort - so sad */ 117083448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 1171a4130367SJan Kara if (err < 0) 1172ac27a0ecSDave Kleikamp break; 1173ac27a0ecSDave Kleikamp 117401f795f9SYongqiang Yang if (meta_bg == 0) 11759378c676SJan Kara backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; 117601f795f9SYongqiang Yang else 11778f49ec60SBaokun Li backup_block = first_block + has_super; 117801f795f9SYongqiang Yang 117901f795f9SYongqiang Yang bh = sb_getblk(sb, backup_block); 1180aebf0243SWang Shilong if (unlikely(!bh)) { 1181860d21e2STheodore Ts'o err = -ENOMEM; 1182ac27a0ecSDave Kleikamp break; 1183ac27a0ecSDave Kleikamp } 118401f795f9SYongqiang Yang ext4_debug("update metadata backup %llu(+%llu)\n", 118501f795f9SYongqiang Yang backup_block, backup_block - 118601f795f9SYongqiang Yang ext4_group_first_block_no(sb, group)); 11875d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1188188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, bh, 1189188c299eSJan Kara EXT4_JTR_NONE))) 1190ac27a0ecSDave Kleikamp break; 1191ac27a0ecSDave Kleikamp lock_buffer(bh); 1192ac27a0ecSDave Kleikamp memcpy(bh->b_data, data, size); 1193ac27a0ecSDave Kleikamp if (rest) 1194ac27a0ecSDave Kleikamp memset(bh->b_data + size, 0, rest); 11958f49ec60SBaokun Li if (has_super && (backup_block == first_block)) 11968f49ec60SBaokun Li ext4_set_block_group_nr(sb, bh->b_data, group); 1197ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 1198ac27a0ecSDave Kleikamp unlock_buffer(bh); 1199b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, bh); 1200b4097142STheodore Ts'o if (unlikely(err)) 1201b4097142STheodore Ts'o ext4_std_error(sb, err); 1202ac27a0ecSDave Kleikamp brelse(bh); 120301f795f9SYongqiang Yang 120401f795f9SYongqiang Yang if (meta_bg == 0) 120501f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 120601f795f9SYongqiang Yang else if (group == last) 120701f795f9SYongqiang Yang break; 120801f795f9SYongqiang Yang else 120901f795f9SYongqiang Yang group = last; 1210ac27a0ecSDave Kleikamp } 1211617ba13bSMingming Cao if ((err2 = ext4_journal_stop(handle)) && !err) 1212ac27a0ecSDave Kleikamp err = err2; 1213ac27a0ecSDave Kleikamp 1214ac27a0ecSDave Kleikamp /* 1215ac27a0ecSDave Kleikamp * Ugh! Need to have e2fsck write the backup copies. It is too 1216ac27a0ecSDave Kleikamp * late to revert the resize, we shouldn't fail just because of 1217ac27a0ecSDave Kleikamp * the backup copies (they are only needed in case of corruption). 1218ac27a0ecSDave Kleikamp * 1219ac27a0ecSDave Kleikamp * However, if we got here we have a journal problem too, so we 1220ac27a0ecSDave Kleikamp * can't really start a transaction to mark the superblock. 1221ac27a0ecSDave Kleikamp * Chicken out and just set the flag on the hope it will be written 1222ac27a0ecSDave Kleikamp * to disk, and if not - we will simply wait until next fsck. 1223ac27a0ecSDave Kleikamp */ 1224ac27a0ecSDave Kleikamp exit_err: 1225ac27a0ecSDave Kleikamp if (err) { 122612062dddSEric Sandeen ext4_warning(sb, "can't update backup for group %u (err %d), " 1227ac27a0ecSDave Kleikamp "forcing fsck on next reboot", group, err); 1228617ba13bSMingming Cao sbi->s_mount_state &= ~EXT4_VALID_FS; 1229617ba13bSMingming Cao sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1230ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 1231ac27a0ecSDave Kleikamp } 1232ac27a0ecSDave Kleikamp } 1233ac27a0ecSDave Kleikamp 1234bb08c1e7SYongqiang Yang /* 1235bb08c1e7SYongqiang Yang * ext4_add_new_descs() adds @count group descriptor of groups 1236bb08c1e7SYongqiang Yang * starting at @group 1237bb08c1e7SYongqiang Yang * 1238bb08c1e7SYongqiang Yang * @handle: journal handle 1239bb08c1e7SYongqiang Yang * @sb: super block 1240bb08c1e7SYongqiang Yang * @group: the group no. of the first group desc to be added 1241bb08c1e7SYongqiang Yang * @resize_inode: the resize inode 1242bb08c1e7SYongqiang Yang * @count: number of group descriptors to be added 1243bb08c1e7SYongqiang Yang */ 1244bb08c1e7SYongqiang Yang static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, 1245bb08c1e7SYongqiang Yang ext4_group_t group, struct inode *resize_inode, 1246bb08c1e7SYongqiang Yang ext4_group_t count) 1247bb08c1e7SYongqiang Yang { 1248bb08c1e7SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1249bb08c1e7SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 1250bb08c1e7SYongqiang Yang struct buffer_head *gdb_bh; 1251bb08c1e7SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 125201f795f9SYongqiang Yang int meta_bg; 1253bb08c1e7SYongqiang Yang 1254e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 1255bb08c1e7SYongqiang Yang for (i = 0; i < count; i++, group++) { 1256bb08c1e7SYongqiang Yang int reserved_gdb = ext4_bg_has_super(sb, group) ? 1257bb08c1e7SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1258bb08c1e7SYongqiang Yang 1259bb08c1e7SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1260bb08c1e7SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1261bb08c1e7SYongqiang Yang 1262bb08c1e7SYongqiang Yang /* 1263bb08c1e7SYongqiang Yang * We will only either add reserved group blocks to a backup group 1264bb08c1e7SYongqiang Yang * or remove reserved blocks for the first group in a new group block. 1265bb08c1e7SYongqiang Yang * Doing both would be mean more complex code, and sane people don't 1266bb08c1e7SYongqiang Yang * use non-sparse filesystems anymore. This is already checked above. 1267bb08c1e7SYongqiang Yang */ 1268bb08c1e7SYongqiang Yang if (gdb_off) { 12691d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 12701d0c3924STheodore Ts'o gdb_num); 12715d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 1272188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, 1273188c299eSJan Kara EXT4_JTR_NONE); 1274bb08c1e7SYongqiang Yang 1275bb08c1e7SYongqiang Yang if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) 1276bb08c1e7SYongqiang Yang err = reserve_backup_gdb(handle, resize_inode, group); 127701f795f9SYongqiang Yang } else if (meta_bg != 0) { 127801f795f9SYongqiang Yang err = add_new_gdb_meta_bg(sb, handle, group); 127901f795f9SYongqiang Yang } else { 1280bb08c1e7SYongqiang Yang err = add_new_gdb(handle, resize_inode, group); 128101f795f9SYongqiang Yang } 1282bb08c1e7SYongqiang Yang if (err) 1283bb08c1e7SYongqiang Yang break; 1284bb08c1e7SYongqiang Yang } 1285bb08c1e7SYongqiang Yang return err; 1286bb08c1e7SYongqiang Yang } 1287bb08c1e7SYongqiang Yang 128841a246d1SDarrick J. Wong static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 128941a246d1SDarrick J. Wong { 129041a246d1SDarrick J. Wong struct buffer_head *bh = sb_getblk(sb, block); 1291aebf0243SWang Shilong if (unlikely(!bh)) 129241a246d1SDarrick J. Wong return NULL; 12937f1468d1SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 12942d069c08Szhangyi (F) if (ext4_read_bh(bh, 0, NULL) < 0) { 129541a246d1SDarrick J. Wong brelse(bh); 129641a246d1SDarrick J. Wong return NULL; 129741a246d1SDarrick J. Wong } 12987f1468d1SDmitry Monakhov } 129941a246d1SDarrick J. Wong 130041a246d1SDarrick J. Wong return bh; 130141a246d1SDarrick J. Wong } 130241a246d1SDarrick J. Wong 130341a246d1SDarrick J. Wong static int ext4_set_bitmap_checksums(struct super_block *sb, 130441a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 130541a246d1SDarrick J. Wong struct ext4_new_group_data *group_data) 130641a246d1SDarrick J. Wong { 130741a246d1SDarrick J. Wong struct buffer_head *bh; 130841a246d1SDarrick J. Wong 13099aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(sb)) 131041a246d1SDarrick J. Wong return 0; 131141a246d1SDarrick J. Wong 131241a246d1SDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->inode_bitmap); 131341a246d1SDarrick J. Wong if (!bh) 131441a246d1SDarrick J. Wong return -EIO; 13154fd873c8SKemeng Shi ext4_inode_bitmap_csum_set(sb, gdp, bh, 131641a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 131741a246d1SDarrick J. Wong brelse(bh); 131841a246d1SDarrick J. Wong 1319fa77dcfaSDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->block_bitmap); 1320fa77dcfaSDarrick J. Wong if (!bh) 1321fa77dcfaSDarrick J. Wong return -EIO; 13221df9bde4SKemeng Shi ext4_block_bitmap_csum_set(sb, gdp, bh); 1323fa77dcfaSDarrick J. Wong brelse(bh); 1324fa77dcfaSDarrick J. Wong 132541a246d1SDarrick J. Wong return 0; 132641a246d1SDarrick J. Wong } 132741a246d1SDarrick J. Wong 1328083f5b24SYongqiang Yang /* 1329083f5b24SYongqiang Yang * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg 1330083f5b24SYongqiang Yang */ 1331083f5b24SYongqiang Yang static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, 1332083f5b24SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 1333083f5b24SYongqiang Yang { 1334083f5b24SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 1335083f5b24SYongqiang Yang struct ext4_group_desc *gdp; 1336083f5b24SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1337083f5b24SYongqiang Yang struct buffer_head *gdb_bh; 1338083f5b24SYongqiang Yang ext4_group_t group; 1339083f5b24SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 1340083f5b24SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1341083f5b24SYongqiang Yang 1342083f5b24SYongqiang Yang 1343083f5b24SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { 1344083f5b24SYongqiang Yang group = group_data->group; 1345083f5b24SYongqiang Yang 1346083f5b24SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1347083f5b24SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1348083f5b24SYongqiang Yang 1349083f5b24SYongqiang Yang /* 1350083f5b24SYongqiang Yang * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). 1351083f5b24SYongqiang Yang */ 13521d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); 1353083f5b24SYongqiang Yang /* Update group descriptor block for new group */ 13542716b802STheodore Ts'o gdp = (struct ext4_group_desc *)(gdb_bh->b_data + 1355083f5b24SYongqiang Yang gdb_off * EXT4_DESC_SIZE(sb)); 1356083f5b24SYongqiang Yang 1357083f5b24SYongqiang Yang memset(gdp, 0, EXT4_DESC_SIZE(sb)); 1358083f5b24SYongqiang Yang ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); 1359083f5b24SYongqiang Yang ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); 13601df9bde4SKemeng Shi err = ext4_set_bitmap_checksums(sb, gdp, group_data); 136141a246d1SDarrick J. Wong if (err) { 136241a246d1SDarrick J. Wong ext4_std_error(sb, err); 136341a246d1SDarrick J. Wong break; 136441a246d1SDarrick J. Wong } 136541a246d1SDarrick J. Wong 1366083f5b24SYongqiang Yang ext4_inode_table_set(sb, gdp, group_data->inode_table); 1367083f5b24SYongqiang Yang ext4_free_group_clusters_set(sb, gdp, 1368d77147ffSharshads group_data->free_clusters_count); 1369083f5b24SYongqiang Yang ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); 137093f90526STheodore Ts'o if (ext4_has_group_desc_csum(sb)) 137193f90526STheodore Ts'o ext4_itable_unused_set(sb, gdp, 137293f90526STheodore Ts'o EXT4_INODES_PER_GROUP(sb)); 1373083f5b24SYongqiang Yang gdp->bg_flags = cpu_to_le16(*bg_flags); 1374feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1375083f5b24SYongqiang Yang 1376083f5b24SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 1377083f5b24SYongqiang Yang if (unlikely(err)) { 1378083f5b24SYongqiang Yang ext4_std_error(sb, err); 1379083f5b24SYongqiang Yang break; 1380083f5b24SYongqiang Yang } 1381083f5b24SYongqiang Yang 1382083f5b24SYongqiang Yang /* 1383083f5b24SYongqiang Yang * We can allocate memory for mb_alloc based on the new group 1384083f5b24SYongqiang Yang * descriptor 1385083f5b24SYongqiang Yang */ 1386083f5b24SYongqiang Yang err = ext4_mb_add_groupinfo(sb, group, gdp); 1387083f5b24SYongqiang Yang if (err) 1388083f5b24SYongqiang Yang break; 1389083f5b24SYongqiang Yang } 1390083f5b24SYongqiang Yang return err; 1391083f5b24SYongqiang Yang } 1392083f5b24SYongqiang Yang 1393026d0d27SKiselev, Oleg static void ext4_add_overhead(struct super_block *sb, 1394026d0d27SKiselev, Oleg const ext4_fsblk_t overhead) 1395026d0d27SKiselev, Oleg { 1396026d0d27SKiselev, Oleg struct ext4_sb_info *sbi = EXT4_SB(sb); 1397026d0d27SKiselev, Oleg struct ext4_super_block *es = sbi->s_es; 1398026d0d27SKiselev, Oleg 1399026d0d27SKiselev, Oleg sbi->s_overhead += overhead; 1400026d0d27SKiselev, Oleg es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead); 1401026d0d27SKiselev, Oleg smp_wmb(); 1402026d0d27SKiselev, Oleg } 1403026d0d27SKiselev, Oleg 14042e10e2f2SYongqiang Yang /* 14052e10e2f2SYongqiang Yang * ext4_update_super() updates the super block so that the newly added 14062e10e2f2SYongqiang Yang * groups can be seen by the filesystem. 14072e10e2f2SYongqiang Yang * 14082e10e2f2SYongqiang Yang * @sb: super block 14092e10e2f2SYongqiang Yang * @flex_gd: new added groups 14102e10e2f2SYongqiang Yang */ 14112e10e2f2SYongqiang Yang static void ext4_update_super(struct super_block *sb, 14122e10e2f2SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 14132e10e2f2SYongqiang Yang { 14142e10e2f2SYongqiang Yang ext4_fsblk_t blocks_count = 0; 14152e10e2f2SYongqiang Yang ext4_fsblk_t free_blocks = 0; 14162e10e2f2SYongqiang Yang ext4_fsblk_t reserved_blocks = 0; 14172e10e2f2SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 14182e10e2f2SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 14192e10e2f2SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 14208a991849STheodore Ts'o int i; 14212e10e2f2SYongqiang Yang 14222e10e2f2SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 14232e10e2f2SYongqiang Yang /* 14242e10e2f2SYongqiang Yang * Make the new blocks and inodes valid next. We do this before 14252e10e2f2SYongqiang Yang * increasing the group count so that once the group is enabled, 14262e10e2f2SYongqiang Yang * all of its blocks and inodes are already valid. 14272e10e2f2SYongqiang Yang * 14282e10e2f2SYongqiang Yang * We always allocate group-by-group, then block-by-block or 14292e10e2f2SYongqiang Yang * inode-by-inode within a group, so enabling these 14302e10e2f2SYongqiang Yang * blocks/inodes before the group is live won't actually let us 14312e10e2f2SYongqiang Yang * allocate the new space yet. 14322e10e2f2SYongqiang Yang */ 14332e10e2f2SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 14342e10e2f2SYongqiang Yang blocks_count += group_data[i].blocks_count; 1435d77147ffSharshads free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); 14362e10e2f2SYongqiang Yang } 14372e10e2f2SYongqiang Yang 14382e10e2f2SYongqiang Yang reserved_blocks = ext4_r_blocks_count(es) * 100; 143901f795f9SYongqiang Yang reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); 14402e10e2f2SYongqiang Yang reserved_blocks *= blocks_count; 14412e10e2f2SYongqiang Yang do_div(reserved_blocks, 100); 14422e10e2f2SYongqiang Yang 144305c2c00fSJan Kara lock_buffer(sbi->s_sbh); 14442e10e2f2SYongqiang Yang ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); 1445636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); 14462e10e2f2SYongqiang Yang le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * 14472e10e2f2SYongqiang Yang flex_gd->count); 1448636d7e2eSDarrick J. Wong le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * 1449636d7e2eSDarrick J. Wong flex_gd->count); 14502e10e2f2SYongqiang Yang 145101f795f9SYongqiang Yang ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); 14522e10e2f2SYongqiang Yang /* 14532e10e2f2SYongqiang Yang * We need to protect s_groups_count against other CPUs seeing 14542e10e2f2SYongqiang Yang * inconsistent state in the superblock. 14552e10e2f2SYongqiang Yang * 14562e10e2f2SYongqiang Yang * The precise rules we use are: 14572e10e2f2SYongqiang Yang * 14582e10e2f2SYongqiang Yang * * Writers must perform a smp_wmb() after updating all 14592e10e2f2SYongqiang Yang * dependent data and before modifying the groups count 14602e10e2f2SYongqiang Yang * 14612e10e2f2SYongqiang Yang * * Readers must perform an smp_rmb() after reading the groups 14622e10e2f2SYongqiang Yang * count and before reading any dependent data. 14632e10e2f2SYongqiang Yang * 14642e10e2f2SYongqiang Yang * NB. These rules can be relaxed when checking the group count 14652e10e2f2SYongqiang Yang * while freeing data, as we can only allocate from a block 14662e10e2f2SYongqiang Yang * group after serialising against the group count, and we can 14672e10e2f2SYongqiang Yang * only then free after serialising in turn against that 14682e10e2f2SYongqiang Yang * allocation. 14692e10e2f2SYongqiang Yang */ 14702e10e2f2SYongqiang Yang smp_wmb(); 14712e10e2f2SYongqiang Yang 14722e10e2f2SYongqiang Yang /* Update the global fs size fields */ 14732e10e2f2SYongqiang Yang sbi->s_groups_count += flex_gd->count; 1474c5c72d81STheodore Ts'o sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 1475c5c72d81STheodore Ts'o (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 14762e10e2f2SYongqiang Yang 14772e10e2f2SYongqiang Yang /* Update the reserved block counts only once the new group is 14782e10e2f2SYongqiang Yang * active. */ 14792e10e2f2SYongqiang Yang ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + 14802e10e2f2SYongqiang Yang reserved_blocks); 14812e10e2f2SYongqiang Yang 14822e10e2f2SYongqiang Yang /* Update the free space counts */ 14832e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeclusters_counter, 1484810da240SLukas Czerner EXT4_NUM_B2C(sbi, free_blocks)); 14852e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeinodes_counter, 14862e10e2f2SYongqiang Yang EXT4_INODES_PER_GROUP(sb) * flex_gd->count); 14872e10e2f2SYongqiang Yang 148801f795f9SYongqiang Yang ext4_debug("free blocks count %llu", 148901f795f9SYongqiang Yang percpu_counter_read(&sbi->s_freeclusters_counter)); 1490e2b911c5SDarrick J. Wong if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { 14912e10e2f2SYongqiang Yang ext4_group_t flex_group; 14927c990728SSuraj Jitindar Singh struct flex_groups *fg; 14937c990728SSuraj Jitindar Singh 14942e10e2f2SYongqiang Yang flex_group = ext4_flex_group(sbi, group_data[0].group); 14957c990728SSuraj Jitindar Singh fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); 149690ba983fSTheodore Ts'o atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), 14977c990728SSuraj Jitindar Singh &fg->free_clusters); 14982e10e2f2SYongqiang Yang atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, 14997c990728SSuraj Jitindar Singh &fg->free_inodes); 15002e10e2f2SYongqiang Yang } 15012e10e2f2SYongqiang Yang 1502952fc18eSTheodore Ts'o /* 1503026d0d27SKiselev, Oleg * Update the fs overhead information. 1504026d0d27SKiselev, Oleg * 1505026d0d27SKiselev, Oleg * For bigalloc, if the superblock already has a properly calculated 1506026d0d27SKiselev, Oleg * overhead, update it with a value based on numbers already computed 1507026d0d27SKiselev, Oleg * above for the newly allocated capacity. 1508952fc18eSTheodore Ts'o */ 1509026d0d27SKiselev, Oleg if (ext4_has_feature_bigalloc(sb) && (sbi->s_overhead != 0)) 1510026d0d27SKiselev, Oleg ext4_add_overhead(sb, 1511026d0d27SKiselev, Oleg EXT4_NUM_B2C(sbi, blocks_count - free_blocks)); 1512026d0d27SKiselev, Oleg else 1513952fc18eSTheodore Ts'o ext4_calculate_overhead(sb); 1514de394a86STheodore Ts'o es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead); 1515952fc18eSTheodore Ts'o 1516a408f33eSBaokun Li ext4_superblock_csum_set(sb); 1517a408f33eSBaokun Li unlock_buffer(sbi->s_sbh); 15182e10e2f2SYongqiang Yang if (test_opt(sb, DEBUG)) 15192e10e2f2SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: added group %u:" 15202e10e2f2SYongqiang Yang "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, 15212e10e2f2SYongqiang Yang blocks_count, free_blocks, reserved_blocks); 15222e10e2f2SYongqiang Yang } 15232e10e2f2SYongqiang Yang 15244bac1f8cSYongqiang Yang /* Add a flex group to an fs. Ensure we handle all possible error conditions 15254bac1f8cSYongqiang Yang * _before_ we start modifying the filesystem, because we cannot abort the 15264bac1f8cSYongqiang Yang * transaction and not have it write the data to disk. 15274bac1f8cSYongqiang Yang */ 15284bac1f8cSYongqiang Yang static int ext4_flex_group_add(struct super_block *sb, 15294bac1f8cSYongqiang Yang struct inode *resize_inode, 15304bac1f8cSYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 15314bac1f8cSYongqiang Yang { 15324bac1f8cSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 15334bac1f8cSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 15344bac1f8cSYongqiang Yang ext4_fsblk_t o_blocks_count; 15354bac1f8cSYongqiang Yang ext4_grpblk_t last; 15364bac1f8cSYongqiang Yang ext4_group_t group; 15374bac1f8cSYongqiang Yang handle_t *handle; 15384bac1f8cSYongqiang Yang unsigned reserved_gdb; 15394bac1f8cSYongqiang Yang int err = 0, err2 = 0, credit; 15404bac1f8cSYongqiang Yang 15414bac1f8cSYongqiang Yang BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); 15424bac1f8cSYongqiang Yang 15434bac1f8cSYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 15444bac1f8cSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 15454bac1f8cSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 15464bac1f8cSYongqiang Yang BUG_ON(last); 15474bac1f8cSYongqiang Yang 15484bac1f8cSYongqiang Yang err = setup_new_flex_group_blocks(sb, flex_gd); 15494bac1f8cSYongqiang Yang if (err) 15504bac1f8cSYongqiang Yang goto exit; 15514bac1f8cSYongqiang Yang /* 15524bac1f8cSYongqiang Yang * We will always be modifying at least the superblock and GDT 15532c869b26SJan Kara * blocks. If we are adding a group past the last current GDT block, 15544bac1f8cSYongqiang Yang * we will also modify the inode and the dindirect block. If we 15554bac1f8cSYongqiang Yang * are adding a group with superblock/GDT backups we will also 15564bac1f8cSYongqiang Yang * modify each of the reserved GDT dindirect blocks. 15574bac1f8cSYongqiang Yang */ 15582c869b26SJan Kara credit = 3; /* sb, resize inode, resize inode dindirect */ 15592c869b26SJan Kara /* GDT blocks */ 15602c869b26SJan Kara credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); 15612c869b26SJan Kara credit += reserved_gdb; /* Reserved GDT dindirect blocks */ 15629924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); 15634bac1f8cSYongqiang Yang if (IS_ERR(handle)) { 15644bac1f8cSYongqiang Yang err = PTR_ERR(handle); 15654bac1f8cSYongqiang Yang goto exit; 15664bac1f8cSYongqiang Yang } 15674bac1f8cSYongqiang Yang 15685d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1569188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1570188c299eSJan Kara EXT4_JTR_NONE); 15714bac1f8cSYongqiang Yang if (err) 15724bac1f8cSYongqiang Yang goto exit_journal; 15734bac1f8cSYongqiang Yang 15744bac1f8cSYongqiang Yang group = flex_gd->groups[0].group; 157549598e04SJun Piao BUG_ON(group != sbi->s_groups_count); 15764bac1f8cSYongqiang Yang err = ext4_add_new_descs(handle, sb, group, 15774bac1f8cSYongqiang Yang resize_inode, flex_gd->count); 15784bac1f8cSYongqiang Yang if (err) 15794bac1f8cSYongqiang Yang goto exit_journal; 15804bac1f8cSYongqiang Yang 15814bac1f8cSYongqiang Yang err = ext4_setup_new_descs(handle, sb, flex_gd); 15824bac1f8cSYongqiang Yang if (err) 15834bac1f8cSYongqiang Yang goto exit_journal; 15844bac1f8cSYongqiang Yang 15854bac1f8cSYongqiang Yang ext4_update_super(sb, flex_gd); 15864bac1f8cSYongqiang Yang 1587a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 15884bac1f8cSYongqiang Yang 15894bac1f8cSYongqiang Yang exit_journal: 15904bac1f8cSYongqiang Yang err2 = ext4_journal_stop(handle); 15914bac1f8cSYongqiang Yang if (!err) 15924bac1f8cSYongqiang Yang err = err2; 15934bac1f8cSYongqiang Yang 15944bac1f8cSYongqiang Yang if (!err) { 15952ebd1704SYongqiang Yang int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 15962ebd1704SYongqiang Yang int gdb_num_end = ((group + flex_gd->count - 1) / 15972ebd1704SYongqiang Yang EXT4_DESC_PER_BLOCK(sb)); 1598e2b911c5SDarrick J. Wong int meta_bg = ext4_has_feature_meta_bg(sb); 1599a5ab5da0SKemeng Shi sector_t padding_blocks = meta_bg ? 0 : sbi->s_sbh->b_blocknr - 1600a5ab5da0SKemeng Shi ext4_group_first_block_no(sb, 0); 16010acdb887STao Ma sector_t old_gdb = 0; 16022ebd1704SYongqiang Yang 16030aeaa255SBaokun Li update_backups(sb, ext4_group_first_block_no(sb, 0), 16040aeaa255SBaokun Li (char *)es, sizeof(struct ext4_super_block), 0); 16052ebd1704SYongqiang Yang for (; gdb_num <= gdb_num_end; gdb_num++) { 16064bac1f8cSYongqiang Yang struct buffer_head *gdb_bh; 16072ebd1704SYongqiang Yang 16081d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 16091d0c3924STheodore Ts'o gdb_num); 16100acdb887STao Ma if (old_gdb == gdb_bh->b_blocknr) 16110acdb887STao Ma continue; 1612a5ab5da0SKemeng Shi update_backups(sb, gdb_bh->b_blocknr - padding_blocks, 1613a5ab5da0SKemeng Shi gdb_bh->b_data, gdb_bh->b_size, meta_bg); 16140acdb887STao Ma old_gdb = gdb_bh->b_blocknr; 16154bac1f8cSYongqiang Yang } 16164bac1f8cSYongqiang Yang } 16174bac1f8cSYongqiang Yang exit: 16184bac1f8cSYongqiang Yang return err; 16194bac1f8cSYongqiang Yang } 16204bac1f8cSYongqiang Yang 162119c5246dSYongqiang Yang static int ext4_setup_next_flex_gd(struct super_block *sb, 162219c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 162319c5246dSYongqiang Yang ext4_fsblk_t n_blocks_count, 162419c5246dSYongqiang Yang unsigned long flexbg_size) 162519c5246dSYongqiang Yang { 1626d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 1627d77147ffSharshads struct ext4_super_block *es = sbi->s_es; 162819c5246dSYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 162919c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 163019c5246dSYongqiang Yang ext4_group_t n_group; 163119c5246dSYongqiang Yang ext4_group_t group; 163219c5246dSYongqiang Yang ext4_group_t last_group; 163319c5246dSYongqiang Yang ext4_grpblk_t last; 1634d77147ffSharshads ext4_grpblk_t clusters_per_group; 163519c5246dSYongqiang Yang unsigned long i; 163619c5246dSYongqiang Yang 1637d77147ffSharshads clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); 163819c5246dSYongqiang Yang 163919c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 164019c5246dSYongqiang Yang 164119c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 164219c5246dSYongqiang Yang return 0; 164319c5246dSYongqiang Yang 164419c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 164519c5246dSYongqiang Yang BUG_ON(last); 164619c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); 164719c5246dSYongqiang Yang 164819c5246dSYongqiang Yang last_group = group | (flexbg_size - 1); 164919c5246dSYongqiang Yang if (last_group > n_group) 165019c5246dSYongqiang Yang last_group = n_group; 165119c5246dSYongqiang Yang 165219c5246dSYongqiang Yang flex_gd->count = last_group - group + 1; 165319c5246dSYongqiang Yang 165419c5246dSYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 165519c5246dSYongqiang Yang int overhead; 165619c5246dSYongqiang Yang 165719c5246dSYongqiang Yang group_data[i].group = group + i; 1658d77147ffSharshads group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); 165901f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group + i); 1660d77147ffSharshads group_data[i].mdata_blocks = overhead; 1661d77147ffSharshads group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); 16627f511862STheodore Ts'o if (ext4_has_group_desc_csum(sb)) { 166319c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | 166419c5246dSYongqiang Yang EXT4_BG_INODE_UNINIT; 16657f511862STheodore Ts'o if (!test_opt(sb, INIT_INODE_TABLE)) 16667f511862STheodore Ts'o flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; 16677f511862STheodore Ts'o } else 166819c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; 166919c5246dSYongqiang Yang } 167019c5246dSYongqiang Yang 1671feb0ab32SDarrick J. Wong if (last_group == n_group && ext4_has_group_desc_csum(sb)) 167219c5246dSYongqiang Yang /* We need to initialize block bitmap of last group. */ 167319c5246dSYongqiang Yang flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; 167419c5246dSYongqiang Yang 1675d77147ffSharshads if ((last_group == n_group) && (last != clusters_per_group - 1)) { 1676d77147ffSharshads group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); 1677d77147ffSharshads group_data[i - 1].free_clusters_count -= clusters_per_group - 167819c5246dSYongqiang Yang last - 1; 167919c5246dSYongqiang Yang } 168019c5246dSYongqiang Yang 168119c5246dSYongqiang Yang return 1; 168219c5246dSYongqiang Yang } 168319c5246dSYongqiang Yang 1684ac27a0ecSDave Kleikamp /* Add group descriptor data to an existing or new group descriptor block. 1685ac27a0ecSDave Kleikamp * Ensure we handle all possible error conditions _before_ we start modifying 1686ac27a0ecSDave Kleikamp * the filesystem, because we cannot abort the transaction and not have it 1687ac27a0ecSDave Kleikamp * write the data to disk. 1688ac27a0ecSDave Kleikamp * 1689ac27a0ecSDave Kleikamp * If we are on a GDT block boundary, we need to get the reserved GDT block. 1690ac27a0ecSDave Kleikamp * Otherwise, we may need to add backup GDT blocks for a sparse group. 1691ac27a0ecSDave Kleikamp * 1692ac27a0ecSDave Kleikamp * We only need to hold the superblock lock while we are actually adding 1693ac27a0ecSDave Kleikamp * in the new group's counts to the superblock. Prior to that we have 1694ac27a0ecSDave Kleikamp * not really "added" the group at all. We re-check that we are still 1695ac27a0ecSDave Kleikamp * adding in the last group in case things have changed since verifying. 1696ac27a0ecSDave Kleikamp */ 1697617ba13bSMingming Cao int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 1698ac27a0ecSDave Kleikamp { 169961f296ccSYongqiang Yang struct ext4_new_flex_group_data flex_gd; 1700617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1701617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 1702617ba13bSMingming Cao int reserved_gdb = ext4_bg_has_super(sb, input->group) ? 1703ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1704ac27a0ecSDave Kleikamp struct inode *inode = NULL; 170503b40e34SJon Ernst int gdb_off; 170661f296ccSYongqiang Yang int err; 170761f296ccSYongqiang Yang __u16 bg_flags = 0; 1708ac27a0ecSDave Kleikamp 1709617ba13bSMingming Cao gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); 1710ac27a0ecSDave Kleikamp 1711e2b911c5SDarrick J. Wong if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { 171212062dddSEric Sandeen ext4_warning(sb, "Can't resize non-sparse filesystem further"); 1713ac27a0ecSDave Kleikamp return -EPERM; 1714ac27a0ecSDave Kleikamp } 1715ac27a0ecSDave Kleikamp 1716bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) + input->blocks_count < 1717bd81d8eeSLaurent Vivier ext4_blocks_count(es)) { 171812062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1719ac27a0ecSDave Kleikamp return -EINVAL; 1720ac27a0ecSDave Kleikamp } 1721ac27a0ecSDave Kleikamp 1722617ba13bSMingming Cao if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < 1723ac27a0ecSDave Kleikamp le32_to_cpu(es->s_inodes_count)) { 172412062dddSEric Sandeen ext4_warning(sb, "inodes_count overflow"); 1725ac27a0ecSDave Kleikamp return -EINVAL; 1726ac27a0ecSDave Kleikamp } 1727ac27a0ecSDave Kleikamp 1728ac27a0ecSDave Kleikamp if (reserved_gdb || gdb_off == 0) { 1729e647e291Sruippan (潘睿) if (!ext4_has_feature_resize_inode(sb) || 1730e2b911c5SDarrick J. Wong !le16_to_cpu(es->s_reserved_gdt_blocks)) { 173112062dddSEric Sandeen ext4_warning(sb, 1732ac27a0ecSDave Kleikamp "No reserved GDT blocks, can't resize"); 1733ac27a0ecSDave Kleikamp return -EPERM; 1734ac27a0ecSDave Kleikamp } 17358a363970STheodore Ts'o inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); 17361d1fe1eeSDavid Howells if (IS_ERR(inode)) { 173712062dddSEric Sandeen ext4_warning(sb, "Error opening resize inode"); 17381d1fe1eeSDavid Howells return PTR_ERR(inode); 1739ac27a0ecSDave Kleikamp } 1740ac27a0ecSDave Kleikamp } 1741ac27a0ecSDave Kleikamp 1742920313a7SAneesh Kumar K.V 174361f296ccSYongqiang Yang err = verify_group_input(sb, input); 1744668f4dc5SYongqiang Yang if (err) 174561f296ccSYongqiang Yang goto out; 1746ac27a0ecSDave Kleikamp 1747117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, input->group + 1); 1748117fff10STheodore Ts'o if (err) 17497f511862STheodore Ts'o goto out; 1750117fff10STheodore Ts'o 175128623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, input->group + 1); 175228623c2fSTheodore Ts'o if (err) 175328623c2fSTheodore Ts'o goto out; 175428623c2fSTheodore Ts'o 175561f296ccSYongqiang Yang flex_gd.count = 1; 175661f296ccSYongqiang Yang flex_gd.groups = input; 175761f296ccSYongqiang Yang flex_gd.bg_flags = &bg_flags; 175861f296ccSYongqiang Yang err = ext4_flex_group_add(sb, inode, &flex_gd); 175961f296ccSYongqiang Yang out: 1760ac27a0ecSDave Kleikamp iput(inode); 1761ac27a0ecSDave Kleikamp return err; 1762617ba13bSMingming Cao } /* ext4_group_add */ 1763ac27a0ecSDave Kleikamp 17642b2d6d01STheodore Ts'o /* 176518e31438SYongqiang Yang * extend a group without checking assuming that checking has been done. 176618e31438SYongqiang Yang */ 176718e31438SYongqiang Yang static int ext4_group_extend_no_check(struct super_block *sb, 176818e31438SYongqiang Yang ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) 176918e31438SYongqiang Yang { 177018e31438SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 177118e31438SYongqiang Yang handle_t *handle; 177218e31438SYongqiang Yang int err = 0, err2; 177318e31438SYongqiang Yang 177418e31438SYongqiang Yang /* We will update the superblock, one block bitmap, and 177518e31438SYongqiang Yang * one group descriptor via ext4_group_add_blocks(). 177618e31438SYongqiang Yang */ 17779924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); 177818e31438SYongqiang Yang if (IS_ERR(handle)) { 177918e31438SYongqiang Yang err = PTR_ERR(handle); 178018e31438SYongqiang Yang ext4_warning(sb, "error %d on journal start", err); 178118e31438SYongqiang Yang return err; 178218e31438SYongqiang Yang } 178318e31438SYongqiang Yang 17845d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 1785188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 1786188c299eSJan Kara EXT4_JTR_NONE); 178718e31438SYongqiang Yang if (err) { 178818e31438SYongqiang Yang ext4_warning(sb, "error %d on journal write access", err); 178918e31438SYongqiang Yang goto errout; 179018e31438SYongqiang Yang } 179118e31438SYongqiang Yang 179205c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 179318e31438SYongqiang Yang ext4_blocks_count_set(es, o_blocks_count + add); 1794636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); 179505c2c00fSJan Kara ext4_superblock_csum_set(sb); 179605c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 179718e31438SYongqiang Yang ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, 179818e31438SYongqiang Yang o_blocks_count + add); 179918e31438SYongqiang Yang /* We add the blocks to the bitmap and set the group need init bit */ 180018e31438SYongqiang Yang err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); 180118e31438SYongqiang Yang if (err) 180218e31438SYongqiang Yang goto errout; 1803a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 180418e31438SYongqiang Yang ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, 180518e31438SYongqiang Yang o_blocks_count + add); 180618e31438SYongqiang Yang errout: 180718e31438SYongqiang Yang err2 = ext4_journal_stop(handle); 180818e31438SYongqiang Yang if (err2 && !err) 180918e31438SYongqiang Yang err = err2; 181018e31438SYongqiang Yang 181118e31438SYongqiang Yang if (!err) { 181218e31438SYongqiang Yang if (test_opt(sb, DEBUG)) 181318e31438SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: extended group to %llu " 181418e31438SYongqiang Yang "blocks\n", ext4_blocks_count(es)); 18150aeaa255SBaokun Li update_backups(sb, ext4_group_first_block_no(sb, 0), 181601f795f9SYongqiang Yang (char *)es, sizeof(struct ext4_super_block), 0); 181718e31438SYongqiang Yang } 181818e31438SYongqiang Yang return err; 181918e31438SYongqiang Yang } 182018e31438SYongqiang Yang 182118e31438SYongqiang Yang /* 18222b2d6d01STheodore Ts'o * Extend the filesystem to the new number of blocks specified. This entry 1823ac27a0ecSDave Kleikamp * point is only used to extend the current filesystem to the end of the last 1824ac27a0ecSDave Kleikamp * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" 1825ac27a0ecSDave Kleikamp * for emergencies (because it has no dependencies on reserved blocks). 1826ac27a0ecSDave Kleikamp * 1827617ba13bSMingming Cao * If we _really_ wanted, we could use default values to call ext4_group_add() 1828ac27a0ecSDave Kleikamp * allow the "remount" trick to work for arbitrary resizing, assuming enough 1829ac27a0ecSDave Kleikamp * GDT blocks are reserved to grow to the desired size. 1830ac27a0ecSDave Kleikamp */ 1831617ba13bSMingming Cao int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, 1832617ba13bSMingming Cao ext4_fsblk_t n_blocks_count) 1833ac27a0ecSDave Kleikamp { 1834617ba13bSMingming Cao ext4_fsblk_t o_blocks_count; 1835617ba13bSMingming Cao ext4_grpblk_t last; 1836617ba13bSMingming Cao ext4_grpblk_t add; 1837ac27a0ecSDave Kleikamp struct buffer_head *bh; 18385f21b0e6SFrederic Bohe ext4_group_t group; 1839ac27a0ecSDave Kleikamp 1840bd81d8eeSLaurent Vivier o_blocks_count = ext4_blocks_count(es); 1841ac27a0ecSDave Kleikamp 1842ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 184392b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, 184492b97816STheodore Ts'o "extending last group from %llu to %llu blocks", 1845ac27a0ecSDave Kleikamp o_blocks_count, n_blocks_count); 1846ac27a0ecSDave Kleikamp 1847ac27a0ecSDave Kleikamp if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) 1848ac27a0ecSDave Kleikamp return 0; 1849ac27a0ecSDave Kleikamp 1850ac27a0ecSDave Kleikamp if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 185192b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, 185292b97816STheodore Ts'o "filesystem too large to resize to %llu blocks safely", 185392b97816STheodore Ts'o n_blocks_count); 1854ac27a0ecSDave Kleikamp return -EINVAL; 1855ac27a0ecSDave Kleikamp } 1856ac27a0ecSDave Kleikamp 1857ac27a0ecSDave Kleikamp if (n_blocks_count < o_blocks_count) { 185812062dddSEric Sandeen ext4_warning(sb, "can't shrink FS - resize aborted"); 18598f82f840SYongqiang Yang return -EINVAL; 1860ac27a0ecSDave Kleikamp } 1861ac27a0ecSDave Kleikamp 1862ac27a0ecSDave Kleikamp /* Handle the remaining blocks in the last group only. */ 18635f21b0e6SFrederic Bohe ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 1864ac27a0ecSDave Kleikamp 1865ac27a0ecSDave Kleikamp if (last == 0) { 186612062dddSEric Sandeen ext4_warning(sb, "need to use ext2online to resize further"); 1867ac27a0ecSDave Kleikamp return -EPERM; 1868ac27a0ecSDave Kleikamp } 1869ac27a0ecSDave Kleikamp 1870617ba13bSMingming Cao add = EXT4_BLOCKS_PER_GROUP(sb) - last; 1871ac27a0ecSDave Kleikamp 1872ac27a0ecSDave Kleikamp if (o_blocks_count + add < o_blocks_count) { 187312062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1874ac27a0ecSDave Kleikamp return -EINVAL; 1875ac27a0ecSDave Kleikamp } 1876ac27a0ecSDave Kleikamp 1877ac27a0ecSDave Kleikamp if (o_blocks_count + add > n_blocks_count) 1878ac27a0ecSDave Kleikamp add = n_blocks_count - o_blocks_count; 1879ac27a0ecSDave Kleikamp 1880ac27a0ecSDave Kleikamp if (o_blocks_count + add < n_blocks_count) 188112062dddSEric Sandeen ext4_warning(sb, "will only finish group (%llu blocks, %u new)", 1882ac27a0ecSDave Kleikamp o_blocks_count + add, add); 1883ac27a0ecSDave Kleikamp 1884ac27a0ecSDave Kleikamp /* See if the device is actually as big as what was requested */ 18850a846f49Szhangyi (F) bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); 18860a846f49Szhangyi (F) if (IS_ERR(bh)) { 188712062dddSEric Sandeen ext4_warning(sb, "can't read last block, resize aborted"); 1888ac27a0ecSDave Kleikamp return -ENOSPC; 1889ac27a0ecSDave Kleikamp } 1890ac27a0ecSDave Kleikamp brelse(bh); 1891ac27a0ecSDave Kleikamp 189271df9683SJinpeng Cui return ext4_group_extend_no_check(sb, o_blocks_count, add); 1893617ba13bSMingming Cao } /* ext4_group_extend */ 189419c5246dSYongqiang Yang 18951c6bd717STheodore Ts'o 18961c6bd717STheodore Ts'o static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) 18971c6bd717STheodore Ts'o { 18981c6bd717STheodore Ts'o return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); 18991c6bd717STheodore Ts'o } 19001c6bd717STheodore Ts'o 19011c6bd717STheodore Ts'o /* 19021c6bd717STheodore Ts'o * Release the resize inode and drop the resize_inode feature if there 19031c6bd717STheodore Ts'o * are no more reserved gdt blocks, and then convert the file system 19041c6bd717STheodore Ts'o * to enable meta_bg 19051c6bd717STheodore Ts'o */ 19061c6bd717STheodore Ts'o static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) 19071c6bd717STheodore Ts'o { 19081c6bd717STheodore Ts'o handle_t *handle; 19091c6bd717STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 19101c6bd717STheodore Ts'o struct ext4_super_block *es = sbi->s_es; 191159e31c15STheodore Ts'o struct ext4_inode_info *ei = EXT4_I(inode); 19121c6bd717STheodore Ts'o ext4_fsblk_t nr; 19131c6bd717STheodore Ts'o int i, ret, err = 0; 19141c6bd717STheodore Ts'o int credits = 1; 19151c6bd717STheodore Ts'o 19161c6bd717STheodore Ts'o ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); 191759e31c15STheodore Ts'o if (inode) { 19181c6bd717STheodore Ts'o if (es->s_reserved_gdt_blocks) { 19191c6bd717STheodore Ts'o ext4_error(sb, "Unexpected non-zero " 19201c6bd717STheodore Ts'o "s_reserved_gdt_blocks"); 19211c6bd717STheodore Ts'o return -EPERM; 19221c6bd717STheodore Ts'o } 19231c6bd717STheodore Ts'o 19241c6bd717STheodore Ts'o /* Do a quick sanity check of the resize inode */ 1925d77147ffSharshads if (inode->i_blocks != 1 << (inode->i_blkbits - 1926d77147ffSharshads (9 - sbi->s_cluster_bits))) 19271c6bd717STheodore Ts'o goto invalid_resize_inode; 19281c6bd717STheodore Ts'o for (i = 0; i < EXT4_N_BLOCKS; i++) { 19291c6bd717STheodore Ts'o if (i == EXT4_DIND_BLOCK) { 19301c6bd717STheodore Ts'o if (ei->i_data[i]) 19311c6bd717STheodore Ts'o continue; 19321c6bd717STheodore Ts'o else 19331c6bd717STheodore Ts'o goto invalid_resize_inode; 19341c6bd717STheodore Ts'o } 19351c6bd717STheodore Ts'o if (ei->i_data[i]) 19361c6bd717STheodore Ts'o goto invalid_resize_inode; 19371c6bd717STheodore Ts'o } 19381c6bd717STheodore Ts'o credits += 3; /* block bitmap, bg descriptor, resize inode */ 19391c6bd717STheodore Ts'o } 19401c6bd717STheodore Ts'o 19419924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); 19421c6bd717STheodore Ts'o if (IS_ERR(handle)) 19431c6bd717STheodore Ts'o return PTR_ERR(handle); 19441c6bd717STheodore Ts'o 19455d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1946188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1947188c299eSJan Kara EXT4_JTR_NONE); 19481c6bd717STheodore Ts'o if (err) 19491c6bd717STheodore Ts'o goto errout; 19501c6bd717STheodore Ts'o 195105c2c00fSJan Kara lock_buffer(sbi->s_sbh); 1952e2b911c5SDarrick J. Wong ext4_clear_feature_resize_inode(sb); 1953e2b911c5SDarrick J. Wong ext4_set_feature_meta_bg(sb); 19541c6bd717STheodore Ts'o sbi->s_es->s_first_meta_bg = 19551c6bd717STheodore Ts'o cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); 195605c2c00fSJan Kara ext4_superblock_csum_set(sb); 195705c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 19581c6bd717STheodore Ts'o 1959a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 19601c6bd717STheodore Ts'o if (err) { 19611c6bd717STheodore Ts'o ext4_std_error(sb, err); 19621c6bd717STheodore Ts'o goto errout; 19631c6bd717STheodore Ts'o } 19641c6bd717STheodore Ts'o 19651c6bd717STheodore Ts'o if (inode) { 19661c6bd717STheodore Ts'o nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); 19671c6bd717STheodore Ts'o ext4_free_blocks(handle, inode, NULL, nr, 1, 19681c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 19691c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 19701c6bd717STheodore Ts'o ei->i_data[EXT4_DIND_BLOCK] = 0; 19711c6bd717STheodore Ts'o inode->i_blocks = 0; 19721c6bd717STheodore Ts'o 19731c6bd717STheodore Ts'o err = ext4_mark_inode_dirty(handle, inode); 19741c6bd717STheodore Ts'o if (err) 19751c6bd717STheodore Ts'o ext4_std_error(sb, err); 19761c6bd717STheodore Ts'o } 19771c6bd717STheodore Ts'o 19781c6bd717STheodore Ts'o errout: 19791c6bd717STheodore Ts'o ret = ext4_journal_stop(handle); 1980409e2d00SKemeng Shi return err ? err : ret; 19811c6bd717STheodore Ts'o 19821c6bd717STheodore Ts'o invalid_resize_inode: 19831c6bd717STheodore Ts'o ext4_error(sb, "corrupted/inconsistent resize inode"); 19841c6bd717STheodore Ts'o return -EINVAL; 19851c6bd717STheodore Ts'o } 19861c6bd717STheodore Ts'o 198719c5246dSYongqiang Yang /* 198819c5246dSYongqiang Yang * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count 198919c5246dSYongqiang Yang * 199019c5246dSYongqiang Yang * @sb: super block of the fs to be resized 199119c5246dSYongqiang Yang * @n_blocks_count: the number of blocks resides in the resized fs 199219c5246dSYongqiang Yang */ 199319c5246dSYongqiang Yang int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 199419c5246dSYongqiang Yang { 199519c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd = NULL; 199619c5246dSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 199719c5246dSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 199819c5246dSYongqiang Yang struct buffer_head *bh; 199901f795f9SYongqiang Yang struct inode *resize_inode = NULL; 200001f795f9SYongqiang Yang ext4_grpblk_t add, offset; 200119c5246dSYongqiang Yang unsigned long n_desc_blocks; 200219c5246dSYongqiang Yang unsigned long o_desc_blocks; 200301f795f9SYongqiang Yang ext4_group_t o_group; 200401f795f9SYongqiang Yang ext4_group_t n_group; 200501f795f9SYongqiang Yang ext4_fsblk_t o_blocks_count; 20061c6bd717STheodore Ts'o ext4_fsblk_t n_blocks_count_retry = 0; 20074da4a56eSTheodore Ts'o unsigned long last_update_time = 0; 2008117fff10STheodore Ts'o int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; 200901f795f9SYongqiang Yang int meta_bg; 201019c5246dSYongqiang Yang 201159e31c15STheodore Ts'o /* See if the device is actually as big as what was requested */ 20120a846f49Szhangyi (F) bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); 20130a846f49Szhangyi (F) if (IS_ERR(bh)) { 201459e31c15STheodore Ts'o ext4_warning(sb, "can't read last block, resize aborted"); 201559e31c15STheodore Ts'o return -ENOSPC; 201659e31c15STheodore Ts'o } 201759e31c15STheodore Ts'o brelse(bh); 201859e31c15STheodore Ts'o 201969cb8e9dSKiselev, Oleg /* 202069cb8e9dSKiselev, Oleg * For bigalloc, trim the requested size to the nearest cluster 202169cb8e9dSKiselev, Oleg * boundary to avoid creating an unusable filesystem. We do this 202269cb8e9dSKiselev, Oleg * silently, instead of returning an error, to avoid breaking 202369cb8e9dSKiselev, Oleg * callers that blindly resize the filesystem to the full size of 202469cb8e9dSKiselev, Oleg * the underlying block device. 202569cb8e9dSKiselev, Oleg */ 202669cb8e9dSKiselev, Oleg if (ext4_has_feature_bigalloc(sb)) 202769cb8e9dSKiselev, Oleg n_blocks_count &= ~((1 << EXT4_CLUSTER_BITS(sb)) - 1); 202869cb8e9dSKiselev, Oleg 20291c6bd717STheodore Ts'o retry: 203019c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 203119c5246dSYongqiang Yang 203259e31c15STheodore Ts'o ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " 203392b97816STheodore Ts'o "to %llu blocks", o_blocks_count, n_blocks_count); 203419c5246dSYongqiang Yang 203519c5246dSYongqiang Yang if (n_blocks_count < o_blocks_count) { 203619c5246dSYongqiang Yang /* On-line shrinking not supported */ 203719c5246dSYongqiang Yang ext4_warning(sb, "can't shrink FS - resize aborted"); 203819c5246dSYongqiang Yang return -EINVAL; 203919c5246dSYongqiang Yang } 204019c5246dSYongqiang Yang 204119c5246dSYongqiang Yang if (n_blocks_count == o_blocks_count) 204219c5246dSYongqiang Yang /* Nothing need to do */ 204319c5246dSYongqiang Yang return 0; 204419c5246dSYongqiang Yang 2045bd86298eSLukas Czerner n_group = ext4_get_group_number(sb, n_blocks_count - 1); 20464f2f76f7SJan Kara if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { 20473f8a6411STheodore Ts'o ext4_warning(sb, "resize would cause inodes_count overflow"); 20483f8a6411STheodore Ts'o return -EINVAL; 20493f8a6411STheodore Ts'o } 2050a0ade1deSLukas Czerner ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); 205119c5246dSYongqiang Yang 20521c6bd717STheodore Ts'o n_desc_blocks = num_desc_blocks(sb, n_group + 1); 20531c6bd717STheodore Ts'o o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); 205419c5246dSYongqiang Yang 2055e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 205601f795f9SYongqiang Yang 2057e2b911c5SDarrick J. Wong if (ext4_has_feature_resize_inode(sb)) { 205801f795f9SYongqiang Yang if (meta_bg) { 205901f795f9SYongqiang Yang ext4_error(sb, "resize_inode and meta_bg enabled " 206001f795f9SYongqiang Yang "simultaneously"); 206101f795f9SYongqiang Yang return -EINVAL; 206201f795f9SYongqiang Yang } 20631c6bd717STheodore Ts'o if (n_desc_blocks > o_desc_blocks + 20641c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks)) { 20651c6bd717STheodore Ts'o n_blocks_count_retry = n_blocks_count; 20661c6bd717STheodore Ts'o n_desc_blocks = o_desc_blocks + 20671c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks); 20681c6bd717STheodore Ts'o n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); 2069aec51758SJerry Lee n_blocks_count = (ext4_fsblk_t)n_group * 2070f96c3ac8SJan Kara EXT4_BLOCKS_PER_GROUP(sb) + 2071f96c3ac8SJan Kara le32_to_cpu(es->s_first_data_block); 20721c6bd717STheodore Ts'o n_group--; /* set to last group number */ 207319c5246dSYongqiang Yang } 20741c6bd717STheodore Ts'o 20751c6bd717STheodore Ts'o if (!resize_inode) 20768a363970STheodore Ts'o resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, 20778a363970STheodore Ts'o EXT4_IGET_SPECIAL); 207819c5246dSYongqiang Yang if (IS_ERR(resize_inode)) { 207919c5246dSYongqiang Yang ext4_warning(sb, "Error opening resize inode"); 208019c5246dSYongqiang Yang return PTR_ERR(resize_inode); 208119c5246dSYongqiang Yang } 20821c6bd717STheodore Ts'o } 20831c6bd717STheodore Ts'o 208459e31c15STheodore Ts'o if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { 20851c6bd717STheodore Ts'o err = ext4_convert_meta_bg(sb, resize_inode); 20861c6bd717STheodore Ts'o if (err) 20871c6bd717STheodore Ts'o goto out; 20881c6bd717STheodore Ts'o if (resize_inode) { 20891c6bd717STheodore Ts'o iput(resize_inode); 20901c6bd717STheodore Ts'o resize_inode = NULL; 20911c6bd717STheodore Ts'o } 20921c6bd717STheodore Ts'o if (n_blocks_count_retry) { 20931c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 20941c6bd717STheodore Ts'o n_blocks_count_retry = 0; 20951c6bd717STheodore Ts'o goto retry; 20961c6bd717STheodore Ts'o } 209701f795f9SYongqiang Yang } 209819c5246dSYongqiang Yang 2099f0a459deSTheodore Ts'o /* 2100f0a459deSTheodore Ts'o * Make sure the last group has enough space so that it's 2101f0a459deSTheodore Ts'o * guaranteed to have enough space for all metadata blocks 2102f0a459deSTheodore Ts'o * that it might need to hold. (We might not need to store 2103f0a459deSTheodore Ts'o * the inode table blocks in the last block group, but there 2104f0a459deSTheodore Ts'o * will be cases where this might be needed.) 2105f0a459deSTheodore Ts'o */ 2106f0a459deSTheodore Ts'o if ((ext4_group_first_block_no(sb, n_group) + 2107f0a459deSTheodore Ts'o ext4_group_overhead_blocks(sb, n_group) + 2 + 2108f0a459deSTheodore Ts'o sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { 2109f0a459deSTheodore Ts'o n_blocks_count = ext4_group_first_block_no(sb, n_group); 2110f0a459deSTheodore Ts'o n_group--; 2111f0a459deSTheodore Ts'o n_blocks_count_retry = 0; 2112f0a459deSTheodore Ts'o if (resize_inode) { 2113f0a459deSTheodore Ts'o iput(resize_inode); 2114f0a459deSTheodore Ts'o resize_inode = NULL; 2115f0a459deSTheodore Ts'o } 2116f0a459deSTheodore Ts'o goto retry; 2117f0a459deSTheodore Ts'o } 2118f0a459deSTheodore Ts'o 211919c5246dSYongqiang Yang /* extend the last group */ 2120a0ade1deSLukas Czerner if (n_group == o_group) 2121a0ade1deSLukas Czerner add = n_blocks_count - o_blocks_count; 2122a0ade1deSLukas Czerner else 2123d77147ffSharshads add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); 2124a0ade1deSLukas Czerner if (add > 0) { 212519c5246dSYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 212619c5246dSYongqiang Yang if (err) 212719c5246dSYongqiang Yang goto out; 212819c5246dSYongqiang Yang } 212919c5246dSYongqiang Yang 2130df3cb754SJerry Lee 李修賢 if (ext4_blocks_count(es) == n_blocks_count && n_blocks_count_retry == 0) 213119c5246dSYongqiang Yang goto out; 213219c5246dSYongqiang Yang 2133117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, n_group + 1); 2134117fff10STheodore Ts'o if (err) 2135f348e224SVasily Averin goto out; 2136117fff10STheodore Ts'o 213728623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, n_group + 1); 213828623c2fSTheodore Ts'o if (err) 213928623c2fSTheodore Ts'o goto out; 214028623c2fSTheodore Ts'o 214119c5246dSYongqiang Yang flex_gd = alloc_flex_gd(flexbg_size); 214219c5246dSYongqiang Yang if (flex_gd == NULL) { 214319c5246dSYongqiang Yang err = -ENOMEM; 214419c5246dSYongqiang Yang goto out; 214519c5246dSYongqiang Yang } 214619c5246dSYongqiang Yang 214719c5246dSYongqiang Yang /* Add flex groups. Note that a regular group is a 214819c5246dSYongqiang Yang * flex group with 1 group. 214919c5246dSYongqiang Yang */ 215019c5246dSYongqiang Yang while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, 215119c5246dSYongqiang Yang flexbg_size)) { 2152a861fb9fSWang Qing if (time_is_before_jiffies(last_update_time + HZ * 10)) { 21534da4a56eSTheodore Ts'o if (last_update_time) 21544da4a56eSTheodore Ts'o ext4_msg(sb, KERN_INFO, 21554da4a56eSTheodore Ts'o "resized to %llu blocks", 21564da4a56eSTheodore Ts'o ext4_blocks_count(es)); 21574da4a56eSTheodore Ts'o last_update_time = jiffies; 21584da4a56eSTheodore Ts'o } 215903c1c290SYongqiang Yang if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) 216003c1c290SYongqiang Yang break; 216119c5246dSYongqiang Yang err = ext4_flex_group_add(sb, resize_inode, flex_gd); 216219c5246dSYongqiang Yang if (unlikely(err)) 216319c5246dSYongqiang Yang break; 216419c5246dSYongqiang Yang } 216519c5246dSYongqiang Yang 21661c6bd717STheodore Ts'o if (!err && n_blocks_count_retry) { 21671c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 21681c6bd717STheodore Ts'o n_blocks_count_retry = 0; 21691c6bd717STheodore Ts'o free_flex_gd(flex_gd); 21701c6bd717STheodore Ts'o flex_gd = NULL; 2171db6aee62SVasily Averin if (resize_inode) { 2172db6aee62SVasily Averin iput(resize_inode); 2173db6aee62SVasily Averin resize_inode = NULL; 2174db6aee62SVasily Averin } 21751c6bd717STheodore Ts'o goto retry; 21761c6bd717STheodore Ts'o } 21771c6bd717STheodore Ts'o 217819c5246dSYongqiang Yang out: 217919c5246dSYongqiang Yang if (flex_gd) 218019c5246dSYongqiang Yang free_flex_gd(flex_gd); 218101f795f9SYongqiang Yang if (resize_inode != NULL) 218219c5246dSYongqiang Yang iput(resize_inode); 21836c732840SLukas Czerner if (err) 21846c732840SLukas Czerner ext4_warning(sb, "error (%d) occurred during " 21856c732840SLukas Czerner "file system resize", err); 21866c732840SLukas Czerner ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", 21876c732840SLukas Czerner ext4_blocks_count(es)); 218819c5246dSYongqiang Yang return err; 218919c5246dSYongqiang Yang } 2190