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> 17ac27a0ecSDave Kleikamp 183dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 19ac27a0ecSDave Kleikamp 201d0c3924STheodore Ts'o struct ext4_rcu_ptr { 211d0c3924STheodore Ts'o struct rcu_head rcu; 221d0c3924STheodore Ts'o void *ptr; 231d0c3924STheodore Ts'o }; 241d0c3924STheodore Ts'o 251d0c3924STheodore Ts'o static void ext4_rcu_ptr_callback(struct rcu_head *head) 261d0c3924STheodore Ts'o { 271d0c3924STheodore Ts'o struct ext4_rcu_ptr *ptr; 281d0c3924STheodore Ts'o 291d0c3924STheodore Ts'o ptr = container_of(head, struct ext4_rcu_ptr, rcu); 301d0c3924STheodore Ts'o kvfree(ptr->ptr); 311d0c3924STheodore Ts'o kfree(ptr); 321d0c3924STheodore Ts'o } 331d0c3924STheodore Ts'o 341d0c3924STheodore Ts'o void ext4_kvfree_array_rcu(void *to_free) 351d0c3924STheodore Ts'o { 361d0c3924STheodore Ts'o struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); 371d0c3924STheodore Ts'o 381d0c3924STheodore Ts'o if (ptr) { 391d0c3924STheodore Ts'o ptr->ptr = to_free; 401d0c3924STheodore Ts'o call_rcu(&ptr->rcu, ext4_rcu_ptr_callback); 411d0c3924STheodore Ts'o return; 421d0c3924STheodore Ts'o } 431d0c3924STheodore Ts'o synchronize_rcu(); 441d0c3924STheodore Ts'o kvfree(to_free); 451d0c3924STheodore Ts'o } 461d0c3924STheodore Ts'o 478f82f840SYongqiang Yang int ext4_resize_begin(struct super_block *sb) 488f82f840SYongqiang Yang { 495f8c1093STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 508f82f840SYongqiang Yang int ret = 0; 518f82f840SYongqiang Yang 528f82f840SYongqiang Yang if (!capable(CAP_SYS_RESOURCE)) 538f82f840SYongqiang Yang return -EPERM; 548f82f840SYongqiang Yang 55ce723c31SYongqiang Yang /* 56011fa994STheodore Ts'o * If we are not using the primary superblock/GDT copy don't resize, 57011fa994STheodore Ts'o * because the user tools have no way of handling this. Probably a 58011fa994STheodore Ts'o * bad time to do it anyways. 59011fa994STheodore Ts'o */ 605f8c1093STheodore Ts'o if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != 61011fa994STheodore Ts'o le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { 62011fa994STheodore Ts'o ext4_warning(sb, "won't resize using backup superblock at %llu", 63011fa994STheodore Ts'o (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); 64011fa994STheodore Ts'o return -EPERM; 65011fa994STheodore Ts'o } 66011fa994STheodore Ts'o 67011fa994STheodore Ts'o /* 68ce723c31SYongqiang Yang * We are not allowed to do online-resizing on a filesystem mounted 69ce723c31SYongqiang Yang * with error, because it can destroy the filesystem easily. 70ce723c31SYongqiang Yang */ 71ce723c31SYongqiang Yang if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 72ce723c31SYongqiang Yang ext4_warning(sb, "There are errors in the filesystem, " 738d2ae1cbSJakub Wilk "so online resizing is not allowed"); 74ce723c31SYongqiang Yang return -EPERM; 75ce723c31SYongqiang Yang } 76ce723c31SYongqiang Yang 77b1489186SJosh Triplett if (ext4_has_feature_sparse_super2(sb)) { 78b1489186SJosh Triplett ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2"); 79b1489186SJosh Triplett return -EOPNOTSUPP; 80b1489186SJosh Triplett } 81e9f9f61dSJosh Triplett 829549a168STheodore Ts'o if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 839549a168STheodore Ts'o &EXT4_SB(sb)->s_ext4_flags)) 848f82f840SYongqiang Yang ret = -EBUSY; 858f82f840SYongqiang Yang 868f82f840SYongqiang Yang return ret; 878f82f840SYongqiang Yang } 888f82f840SYongqiang Yang 898f82f840SYongqiang Yang void ext4_resize_end(struct super_block *sb) 908f82f840SYongqiang Yang { 919549a168STheodore Ts'o clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); 924e857c58SPeter Zijlstra smp_mb__after_atomic(); 938f82f840SYongqiang Yang } 948f82f840SYongqiang Yang 9501f795f9SYongqiang Yang static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, 9601f795f9SYongqiang Yang ext4_group_t group) { 9701f795f9SYongqiang Yang return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << 9801f795f9SYongqiang Yang EXT4_DESC_PER_BLOCK_BITS(sb); 9901f795f9SYongqiang Yang } 10001f795f9SYongqiang Yang 10101f795f9SYongqiang Yang static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, 10201f795f9SYongqiang Yang ext4_group_t group) { 10301f795f9SYongqiang Yang group = ext4_meta_bg_first_group(sb, group); 10401f795f9SYongqiang Yang return ext4_group_first_block_no(sb, group); 10501f795f9SYongqiang Yang } 10601f795f9SYongqiang Yang 10701f795f9SYongqiang Yang static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, 10801f795f9SYongqiang Yang ext4_group_t group) { 10901f795f9SYongqiang Yang ext4_grpblk_t overhead; 11001f795f9SYongqiang Yang overhead = ext4_bg_num_gdb(sb, group); 11101f795f9SYongqiang Yang if (ext4_bg_has_super(sb, group)) 11201f795f9SYongqiang Yang overhead += 1 + 11301f795f9SYongqiang Yang le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 11401f795f9SYongqiang Yang return overhead; 11501f795f9SYongqiang Yang } 11601f795f9SYongqiang Yang 117ac27a0ecSDave Kleikamp #define outside(b, first, last) ((b) < (first) || (b) >= (last)) 118ac27a0ecSDave Kleikamp #define inside(b, first, last) ((b) >= (first) && (b) < (last)) 119ac27a0ecSDave Kleikamp 120ac27a0ecSDave Kleikamp static int verify_group_input(struct super_block *sb, 121617ba13bSMingming Cao struct ext4_new_group_data *input) 122ac27a0ecSDave Kleikamp { 123617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 124617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 125bd81d8eeSLaurent Vivier ext4_fsblk_t start = ext4_blocks_count(es); 126617ba13bSMingming Cao ext4_fsblk_t end = start + input->blocks_count; 127fd2d4291SAvantika Mathur ext4_group_t group = input->group; 128617ba13bSMingming Cao ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; 129b302ef2dSTheodore Ts'o unsigned overhead; 130b302ef2dSTheodore Ts'o ext4_fsblk_t metaend; 131ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1323a5b2ecdSMingming Cao ext4_grpblk_t free_blocks_count, offset; 133ac27a0ecSDave Kleikamp int err = -EINVAL; 134ac27a0ecSDave Kleikamp 135b302ef2dSTheodore Ts'o if (group != sbi->s_groups_count) { 136b302ef2dSTheodore Ts'o ext4_warning(sb, "Cannot add at group %u (only %u groups)", 137b302ef2dSTheodore Ts'o input->group, sbi->s_groups_count); 138b302ef2dSTheodore Ts'o return -EINVAL; 139b302ef2dSTheodore Ts'o } 140b302ef2dSTheodore Ts'o 141b302ef2dSTheodore Ts'o overhead = ext4_group_overhead_blocks(sb, group); 142b302ef2dSTheodore Ts'o metaend = start + overhead; 143d77147ffSharshads input->free_clusters_count = free_blocks_count = 144ac27a0ecSDave Kleikamp input->blocks_count - 2 - overhead - sbi->s_itb_per_group; 145ac27a0ecSDave Kleikamp 146ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 147617ba13bSMingming Cao printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " 148ac27a0ecSDave Kleikamp "(%d free, %u reserved)\n", 149617ba13bSMingming Cao ext4_bg_has_super(sb, input->group) ? "normal" : 150ac27a0ecSDave Kleikamp "no-super", input->group, input->blocks_count, 151ac27a0ecSDave Kleikamp free_blocks_count, input->reserved_blocks); 152ac27a0ecSDave Kleikamp 1533a5b2ecdSMingming Cao ext4_get_group_no_and_offset(sb, start, NULL, &offset); 154b302ef2dSTheodore Ts'o if (offset != 0) 15512062dddSEric Sandeen ext4_warning(sb, "Last group not full"); 156ac27a0ecSDave Kleikamp else if (input->reserved_blocks > input->blocks_count / 5) 15712062dddSEric Sandeen ext4_warning(sb, "Reserved blocks too high (%u)", 158ac27a0ecSDave Kleikamp input->reserved_blocks); 159ac27a0ecSDave Kleikamp else if (free_blocks_count < 0) 16012062dddSEric Sandeen ext4_warning(sb, "Bad blocks count %u", 161ac27a0ecSDave Kleikamp input->blocks_count); 162fb265c9cSTheodore Ts'o else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { 163fb265c9cSTheodore Ts'o err = PTR_ERR(bh); 164fb265c9cSTheodore Ts'o bh = NULL; 16512062dddSEric Sandeen ext4_warning(sb, "Cannot read last block (%llu)", 166ac27a0ecSDave Kleikamp end - 1); 167fb265c9cSTheodore Ts'o } else if (outside(input->block_bitmap, start, end)) 16812062dddSEric Sandeen ext4_warning(sb, "Block bitmap not in group (block %llu)", 1691939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 170ac27a0ecSDave Kleikamp else if (outside(input->inode_bitmap, start, end)) 17112062dddSEric Sandeen ext4_warning(sb, "Inode bitmap not in group (block %llu)", 1721939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap); 173ac27a0ecSDave Kleikamp else if (outside(input->inode_table, start, end) || 174ac27a0ecSDave Kleikamp outside(itend - 1, start, end)) 17512062dddSEric Sandeen ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", 1761939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 177ac27a0ecSDave Kleikamp else if (input->inode_bitmap == input->block_bitmap) 17812062dddSEric Sandeen ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", 1791939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 180ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, input->inode_table, itend)) 18112062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in inode table " 18212062dddSEric Sandeen "(%llu-%llu)", 1831939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1841939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 185ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, input->inode_table, itend)) 18612062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in inode table " 18712062dddSEric Sandeen "(%llu-%llu)", 1881939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1891939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 190ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, start, metaend)) 19112062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", 1921939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1931939e49aSRandy Dunlap start, metaend - 1); 194ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, start, metaend)) 19512062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", 1961939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1971939e49aSRandy Dunlap start, metaend - 1); 198ac27a0ecSDave Kleikamp else if (inside(input->inode_table, start, metaend) || 199ac27a0ecSDave Kleikamp inside(itend - 1, start, metaend)) 20012062dddSEric Sandeen ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " 20112062dddSEric Sandeen "(%llu-%llu)", 2021939e49aSRandy Dunlap (unsigned long long)input->inode_table, 2031939e49aSRandy Dunlap itend - 1, start, metaend - 1); 204ac27a0ecSDave Kleikamp else 205ac27a0ecSDave Kleikamp err = 0; 206ac27a0ecSDave Kleikamp brelse(bh); 207ac27a0ecSDave Kleikamp 208ac27a0ecSDave Kleikamp return err; 209ac27a0ecSDave Kleikamp } 210ac27a0ecSDave Kleikamp 21128c7bac0SYongqiang Yang /* 21228c7bac0SYongqiang Yang * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex 21328c7bac0SYongqiang Yang * group each time. 21428c7bac0SYongqiang Yang */ 21528c7bac0SYongqiang Yang struct ext4_new_flex_group_data { 21628c7bac0SYongqiang Yang struct ext4_new_group_data *groups; /* new_group_data for groups 21728c7bac0SYongqiang Yang in the flex group */ 21828c7bac0SYongqiang Yang __u16 *bg_flags; /* block group flags of groups 21928c7bac0SYongqiang Yang in @groups */ 22028c7bac0SYongqiang Yang ext4_group_t count; /* number of groups in @groups 22128c7bac0SYongqiang Yang */ 22228c7bac0SYongqiang Yang }; 22328c7bac0SYongqiang Yang 22428c7bac0SYongqiang Yang /* 22528c7bac0SYongqiang Yang * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of 22628c7bac0SYongqiang Yang * @flexbg_size. 22728c7bac0SYongqiang Yang * 22828c7bac0SYongqiang Yang * Returns NULL on failure otherwise address of the allocated structure. 22928c7bac0SYongqiang Yang */ 23028c7bac0SYongqiang Yang static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) 23128c7bac0SYongqiang Yang { 23228c7bac0SYongqiang Yang struct ext4_new_flex_group_data *flex_gd; 23328c7bac0SYongqiang Yang 23428c7bac0SYongqiang Yang flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); 23528c7bac0SYongqiang Yang if (flex_gd == NULL) 23628c7bac0SYongqiang Yang goto out3; 23728c7bac0SYongqiang Yang 23846901760SInsu Yun if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) 239967ac8afSHaogang Chen goto out2; 24028c7bac0SYongqiang Yang flex_gd->count = flexbg_size; 24128c7bac0SYongqiang Yang 2426da2ec56SKees Cook flex_gd->groups = kmalloc_array(flexbg_size, 2436da2ec56SKees Cook sizeof(struct ext4_new_group_data), 2446da2ec56SKees Cook GFP_NOFS); 24528c7bac0SYongqiang Yang if (flex_gd->groups == NULL) 24628c7bac0SYongqiang Yang goto out2; 24728c7bac0SYongqiang Yang 2486da2ec56SKees Cook flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), 2496da2ec56SKees Cook GFP_NOFS); 25028c7bac0SYongqiang Yang if (flex_gd->bg_flags == NULL) 25128c7bac0SYongqiang Yang goto out1; 25228c7bac0SYongqiang Yang 25328c7bac0SYongqiang Yang return flex_gd; 25428c7bac0SYongqiang Yang 25528c7bac0SYongqiang Yang out1: 25628c7bac0SYongqiang Yang kfree(flex_gd->groups); 25728c7bac0SYongqiang Yang out2: 25828c7bac0SYongqiang Yang kfree(flex_gd); 25928c7bac0SYongqiang Yang out3: 26028c7bac0SYongqiang Yang return NULL; 26128c7bac0SYongqiang Yang } 26228c7bac0SYongqiang Yang 26328c7bac0SYongqiang Yang static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) 26428c7bac0SYongqiang Yang { 26528c7bac0SYongqiang Yang kfree(flex_gd->bg_flags); 26628c7bac0SYongqiang Yang kfree(flex_gd->groups); 26728c7bac0SYongqiang Yang kfree(flex_gd); 26828c7bac0SYongqiang Yang } 26928c7bac0SYongqiang Yang 2703fbea4b3SYongqiang Yang /* 2713fbea4b3SYongqiang Yang * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps 2723fbea4b3SYongqiang Yang * and inode tables for a flex group. 2733fbea4b3SYongqiang Yang * 2743fbea4b3SYongqiang Yang * This function is used by 64bit-resize. Note that this function allocates 2753fbea4b3SYongqiang Yang * group tables from the 1st group of groups contained by @flexgd, which may 2763fbea4b3SYongqiang Yang * be a partial of a flex group. 2773fbea4b3SYongqiang Yang * 2783fbea4b3SYongqiang Yang * @sb: super block of fs to which the groups belongs 27903c1c290SYongqiang Yang * 28003c1c290SYongqiang Yang * Returns 0 on a successful allocation of the metadata blocks in the 28103c1c290SYongqiang Yang * block group. 2823fbea4b3SYongqiang Yang */ 28303c1c290SYongqiang Yang static int ext4_alloc_group_tables(struct super_block *sb, 2843fbea4b3SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 2853fbea4b3SYongqiang Yang int flexbg_size) 2863fbea4b3SYongqiang Yang { 2873fbea4b3SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 2883fbea4b3SYongqiang Yang ext4_fsblk_t start_blk; 2893fbea4b3SYongqiang Yang ext4_fsblk_t last_blk; 2903fbea4b3SYongqiang Yang ext4_group_t src_group; 2913fbea4b3SYongqiang Yang ext4_group_t bb_index = 0; 2923fbea4b3SYongqiang Yang ext4_group_t ib_index = 0; 2933fbea4b3SYongqiang Yang ext4_group_t it_index = 0; 2943fbea4b3SYongqiang Yang ext4_group_t group; 2953fbea4b3SYongqiang Yang ext4_group_t last_group; 2963fbea4b3SYongqiang Yang unsigned overhead; 297b93c9535STheodore Ts'o __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; 298d77147ffSharshads int i; 2993fbea4b3SYongqiang Yang 3003fbea4b3SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 3013fbea4b3SYongqiang Yang 3023fbea4b3SYongqiang Yang src_group = group_data[0].group; 3033fbea4b3SYongqiang Yang last_group = src_group + flex_gd->count - 1; 3043fbea4b3SYongqiang Yang 3053fbea4b3SYongqiang Yang BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != 3063fbea4b3SYongqiang Yang (last_group & ~(flexbg_size - 1)))); 3073fbea4b3SYongqiang Yang next_group: 3083fbea4b3SYongqiang Yang group = group_data[0].group; 30903c1c290SYongqiang Yang if (src_group >= group_data[0].group + flex_gd->count) 31003c1c290SYongqiang Yang return -ENOSPC; 3113fbea4b3SYongqiang Yang start_blk = ext4_group_first_block_no(sb, src_group); 3123fbea4b3SYongqiang Yang last_blk = start_blk + group_data[src_group - group].blocks_count; 3133fbea4b3SYongqiang Yang 31401f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 3153fbea4b3SYongqiang Yang 3163fbea4b3SYongqiang Yang start_blk += overhead; 3173fbea4b3SYongqiang Yang 3183fbea4b3SYongqiang Yang /* We collect contiguous blocks as much as possible. */ 3193fbea4b3SYongqiang Yang src_group++; 32001f795f9SYongqiang Yang for (; src_group <= last_group; src_group++) { 32101f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 322b93c9535STheodore Ts'o if (overhead == 0) 3233fbea4b3SYongqiang Yang last_blk += group_data[src_group - group].blocks_count; 3243fbea4b3SYongqiang Yang else 3253fbea4b3SYongqiang Yang break; 32601f795f9SYongqiang Yang } 3273fbea4b3SYongqiang Yang 3283fbea4b3SYongqiang Yang /* Allocate block bitmaps */ 3293fbea4b3SYongqiang Yang for (; bb_index < flex_gd->count; bb_index++) { 3303fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3313fbea4b3SYongqiang Yang goto next_group; 3323fbea4b3SYongqiang Yang group_data[bb_index].block_bitmap = start_blk++; 333bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3343fbea4b3SYongqiang Yang group -= group_data[0].group; 335d77147ffSharshads group_data[group].mdata_blocks++; 336b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3373fbea4b3SYongqiang Yang } 3383fbea4b3SYongqiang Yang 3393fbea4b3SYongqiang Yang /* Allocate inode bitmaps */ 3403fbea4b3SYongqiang Yang for (; ib_index < flex_gd->count; ib_index++) { 3413fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3423fbea4b3SYongqiang Yang goto next_group; 3433fbea4b3SYongqiang Yang group_data[ib_index].inode_bitmap = start_blk++; 344bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3453fbea4b3SYongqiang Yang group -= group_data[0].group; 346d77147ffSharshads group_data[group].mdata_blocks++; 347b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3483fbea4b3SYongqiang Yang } 3493fbea4b3SYongqiang Yang 3503fbea4b3SYongqiang Yang /* Allocate inode tables */ 3513fbea4b3SYongqiang Yang for (; it_index < flex_gd->count; it_index++) { 352b93c9535STheodore Ts'o unsigned int itb = EXT4_SB(sb)->s_itb_per_group; 353b93c9535STheodore Ts'o ext4_fsblk_t next_group_start; 354b93c9535STheodore Ts'o 355b93c9535STheodore Ts'o if (start_blk + itb > last_blk) 3563fbea4b3SYongqiang Yang goto next_group; 3573fbea4b3SYongqiang Yang group_data[it_index].inode_table = start_blk; 358b93c9535STheodore Ts'o group = ext4_get_group_number(sb, start_blk); 359b93c9535STheodore Ts'o next_group_start = ext4_group_first_block_no(sb, group + 1); 3603fbea4b3SYongqiang Yang group -= group_data[0].group; 3613fbea4b3SYongqiang Yang 362b93c9535STheodore Ts'o if (start_blk + itb > next_group_start) { 363b93c9535STheodore Ts'o flex_gd->bg_flags[group + 1] &= uninit_mask; 364b93c9535STheodore Ts'o overhead = start_blk + itb - next_group_start; 365d77147ffSharshads group_data[group + 1].mdata_blocks += overhead; 366b93c9535STheodore Ts'o itb -= overhead; 367b93c9535STheodore Ts'o } 368b93c9535STheodore Ts'o 369d77147ffSharshads group_data[group].mdata_blocks += itb; 370b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3713fbea4b3SYongqiang Yang start_blk += EXT4_SB(sb)->s_itb_per_group; 3723fbea4b3SYongqiang Yang } 3733fbea4b3SYongqiang Yang 374d77147ffSharshads /* Update free clusters count to exclude metadata blocks */ 375d77147ffSharshads for (i = 0; i < flex_gd->count; i++) { 376d77147ffSharshads group_data[i].free_clusters_count -= 377d77147ffSharshads EXT4_NUM_B2C(EXT4_SB(sb), 378d77147ffSharshads group_data[i].mdata_blocks); 379d77147ffSharshads } 380d77147ffSharshads 3813fbea4b3SYongqiang Yang if (test_opt(sb, DEBUG)) { 3823fbea4b3SYongqiang Yang int i; 3833fbea4b3SYongqiang Yang group = group_data[0].group; 3843fbea4b3SYongqiang Yang 3853fbea4b3SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: adding a flex group with " 3863fbea4b3SYongqiang Yang "%d groups, flexbg size is %d:\n", flex_gd->count, 3873fbea4b3SYongqiang Yang flexbg_size); 3883fbea4b3SYongqiang Yang 3893fbea4b3SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 390d77147ffSharshads ext4_debug( 391d77147ffSharshads "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", 3923fbea4b3SYongqiang Yang ext4_bg_has_super(sb, group + i) ? "normal" : 3933fbea4b3SYongqiang Yang "no-super", group + i, 3943fbea4b3SYongqiang Yang group_data[i].blocks_count, 395d77147ffSharshads group_data[i].free_clusters_count, 396d77147ffSharshads group_data[i].mdata_blocks); 3973fbea4b3SYongqiang Yang } 3983fbea4b3SYongqiang Yang } 39903c1c290SYongqiang Yang return 0; 4003fbea4b3SYongqiang Yang } 4013fbea4b3SYongqiang Yang 402ac27a0ecSDave Kleikamp static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, 403617ba13bSMingming Cao ext4_fsblk_t blk) 404ac27a0ecSDave Kleikamp { 405ac27a0ecSDave Kleikamp struct buffer_head *bh; 406ac27a0ecSDave Kleikamp int err; 407ac27a0ecSDave Kleikamp 408ac27a0ecSDave Kleikamp bh = sb_getblk(sb, blk); 409aebf0243SWang Shilong if (unlikely(!bh)) 410860d21e2STheodore Ts'o return ERR_PTR(-ENOMEM); 4115d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 412*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); 413*188c299eSJan Kara if (err) { 414ac27a0ecSDave Kleikamp brelse(bh); 415ac27a0ecSDave Kleikamp bh = ERR_PTR(err); 416ac27a0ecSDave Kleikamp } else { 417ac27a0ecSDave Kleikamp memset(bh->b_data, 0, sb->s_blocksize); 418ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 419ac27a0ecSDave Kleikamp } 420ac27a0ecSDave Kleikamp 421ac27a0ecSDave Kleikamp return bh; 422ac27a0ecSDave Kleikamp } 423ac27a0ecSDave Kleikamp 42483448bdfSJan Kara static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits) 42583448bdfSJan Kara { 42683448bdfSJan Kara return ext4_journal_ensure_credits_fn(handle, credits, 42783448bdfSJan Kara EXT4_MAX_TRANS_DATA, 0, 0); 42883448bdfSJan Kara } 42983448bdfSJan Kara 430ac27a0ecSDave Kleikamp /* 431d77147ffSharshads * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. 43233afdcc5SYongqiang Yang * 43333afdcc5SYongqiang Yang * Helper function for ext4_setup_new_group_blocks() which set . 43433afdcc5SYongqiang Yang * 43533afdcc5SYongqiang Yang * @sb: super block 43633afdcc5SYongqiang Yang * @handle: journal handle 43733afdcc5SYongqiang Yang * @flex_gd: flex group data 43833afdcc5SYongqiang Yang */ 43933afdcc5SYongqiang Yang static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, 44033afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 441d77147ffSharshads ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) 44233afdcc5SYongqiang Yang { 443d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 444d77147ffSharshads ext4_group_t count = last_cluster - first_cluster + 1; 44533afdcc5SYongqiang Yang ext4_group_t count2; 44633afdcc5SYongqiang Yang 447d77147ffSharshads ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, 448d77147ffSharshads last_cluster); 449d77147ffSharshads for (count2 = count; count > 0; 450d77147ffSharshads count -= count2, first_cluster += count2) { 45133afdcc5SYongqiang Yang ext4_fsblk_t start; 45233afdcc5SYongqiang Yang struct buffer_head *bh; 45333afdcc5SYongqiang Yang ext4_group_t group; 45433afdcc5SYongqiang Yang int err; 45533afdcc5SYongqiang Yang 456d77147ffSharshads group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); 457d77147ffSharshads start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); 45833afdcc5SYongqiang Yang group -= flex_gd->groups[0].group; 45933afdcc5SYongqiang Yang 460d77147ffSharshads count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); 46133afdcc5SYongqiang Yang if (count2 > count) 46233afdcc5SYongqiang Yang count2 = count; 46333afdcc5SYongqiang Yang 46433afdcc5SYongqiang Yang if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { 46533afdcc5SYongqiang Yang BUG_ON(flex_gd->count > 1); 46633afdcc5SYongqiang Yang continue; 46733afdcc5SYongqiang Yang } 46833afdcc5SYongqiang Yang 46983448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 470a4130367SJan Kara if (err < 0) 47133afdcc5SYongqiang Yang return err; 47233afdcc5SYongqiang Yang 47333afdcc5SYongqiang Yang bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); 474aebf0243SWang Shilong if (unlikely(!bh)) 475860d21e2STheodore Ts'o return -ENOMEM; 47633afdcc5SYongqiang Yang 4775d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 478*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, 479*188c299eSJan Kara EXT4_JTR_NONE); 480cea57941SVasily Averin if (err) { 481cea57941SVasily Averin brelse(bh); 48233afdcc5SYongqiang Yang return err; 483cea57941SVasily Averin } 484d77147ffSharshads ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", 485d77147ffSharshads first_cluster, first_cluster - start, count2); 486d77147ffSharshads ext4_set_bits(bh->b_data, first_cluster - start, count2); 48733afdcc5SYongqiang Yang 48833afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 489cea57941SVasily Averin brelse(bh); 49033afdcc5SYongqiang Yang if (unlikely(err)) 49133afdcc5SYongqiang Yang return err; 49233afdcc5SYongqiang Yang } 49333afdcc5SYongqiang Yang 49433afdcc5SYongqiang Yang return 0; 49533afdcc5SYongqiang Yang } 49633afdcc5SYongqiang Yang 49733afdcc5SYongqiang Yang /* 49833afdcc5SYongqiang Yang * Set up the block and inode bitmaps, and the inode table for the new groups. 49933afdcc5SYongqiang Yang * This doesn't need to be part of the main transaction, since we are only 50033afdcc5SYongqiang Yang * changing blocks outside the actual filesystem. We still do journaling to 50133afdcc5SYongqiang Yang * ensure the recovery is correct in case of a failure just after resize. 50233afdcc5SYongqiang Yang * If any part of this fails, we simply abort the resize. 50333afdcc5SYongqiang Yang * 50433afdcc5SYongqiang Yang * setup_new_flex_group_blocks handles a flex group as follow: 50533afdcc5SYongqiang Yang * 1. copy super block and GDT, and initialize group tables if necessary. 50633afdcc5SYongqiang Yang * In this step, we only set bits in blocks bitmaps for blocks taken by 50733afdcc5SYongqiang Yang * super block and GDT. 50833afdcc5SYongqiang Yang * 2. allocate group tables in block bitmaps, that is, set bits in block 50933afdcc5SYongqiang Yang * bitmap for blocks taken by group tables. 51033afdcc5SYongqiang Yang */ 51133afdcc5SYongqiang Yang static int setup_new_flex_group_blocks(struct super_block *sb, 51233afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 51333afdcc5SYongqiang Yang { 51433afdcc5SYongqiang Yang int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; 51533afdcc5SYongqiang Yang ext4_fsblk_t start; 51633afdcc5SYongqiang Yang ext4_fsblk_t block; 51733afdcc5SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 51833afdcc5SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 51933afdcc5SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 52033afdcc5SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 52133afdcc5SYongqiang Yang handle_t *handle; 52233afdcc5SYongqiang Yang ext4_group_t group, count; 52333afdcc5SYongqiang Yang struct buffer_head *bh = NULL; 52433afdcc5SYongqiang Yang int reserved_gdb, i, j, err = 0, err2; 52501f795f9SYongqiang Yang int meta_bg; 52633afdcc5SYongqiang Yang 52733afdcc5SYongqiang Yang BUG_ON(!flex_gd->count || !group_data || 52833afdcc5SYongqiang Yang group_data[0].group != sbi->s_groups_count); 52933afdcc5SYongqiang Yang 53033afdcc5SYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 531e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 53233afdcc5SYongqiang Yang 53333afdcc5SYongqiang Yang /* This transaction may be extended/restarted along the way */ 5349924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 53533afdcc5SYongqiang Yang if (IS_ERR(handle)) 53633afdcc5SYongqiang Yang return PTR_ERR(handle); 53733afdcc5SYongqiang Yang 53833afdcc5SYongqiang Yang group = group_data[0].group; 53933afdcc5SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group++) { 54033afdcc5SYongqiang Yang unsigned long gdblocks; 54101f795f9SYongqiang Yang ext4_grpblk_t overhead; 54233afdcc5SYongqiang Yang 54333afdcc5SYongqiang Yang gdblocks = ext4_bg_num_gdb(sb, group); 54433afdcc5SYongqiang Yang start = ext4_group_first_block_no(sb, group); 54533afdcc5SYongqiang Yang 54601f795f9SYongqiang Yang if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) 5476df935adSYongqiang Yang goto handle_itb; 5486df935adSYongqiang Yang 54901f795f9SYongqiang Yang if (meta_bg == 1) { 55001f795f9SYongqiang Yang ext4_group_t first_group; 55101f795f9SYongqiang Yang first_group = ext4_meta_bg_first_group(sb, group); 55201f795f9SYongqiang Yang if (first_group != group + 1 && 55301f795f9SYongqiang Yang first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) 55401f795f9SYongqiang Yang goto handle_itb; 55501f795f9SYongqiang Yang } 55601f795f9SYongqiang Yang 55701f795f9SYongqiang Yang block = start + ext4_bg_has_super(sb, group); 55833afdcc5SYongqiang Yang /* Copy all of the GDT blocks into the backup in this group */ 55901f795f9SYongqiang Yang for (j = 0; j < gdblocks; j++, block++) { 56033afdcc5SYongqiang Yang struct buffer_head *gdb; 56133afdcc5SYongqiang Yang 56233afdcc5SYongqiang Yang ext4_debug("update backup group %#04llx\n", block); 56383448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 564a4130367SJan Kara if (err < 0) 56533afdcc5SYongqiang Yang goto out; 56633afdcc5SYongqiang Yang 56733afdcc5SYongqiang Yang gdb = sb_getblk(sb, block); 568aebf0243SWang Shilong if (unlikely(!gdb)) { 569860d21e2STheodore Ts'o err = -ENOMEM; 57033afdcc5SYongqiang Yang goto out; 57133afdcc5SYongqiang Yang } 57233afdcc5SYongqiang Yang 5735d601255Sliang xie BUFFER_TRACE(gdb, "get_write_access"); 574*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb, 575*188c299eSJan Kara EXT4_JTR_NONE); 57633afdcc5SYongqiang Yang if (err) { 57733afdcc5SYongqiang Yang brelse(gdb); 57833afdcc5SYongqiang Yang goto out; 57933afdcc5SYongqiang Yang } 5801d0c3924STheodore Ts'o memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, 5811d0c3924STheodore Ts'o s_group_desc, j)->b_data, gdb->b_size); 58233afdcc5SYongqiang Yang set_buffer_uptodate(gdb); 58333afdcc5SYongqiang Yang 58433afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb); 58533afdcc5SYongqiang Yang if (unlikely(err)) { 58633afdcc5SYongqiang Yang brelse(gdb); 58733afdcc5SYongqiang Yang goto out; 58833afdcc5SYongqiang Yang } 58933afdcc5SYongqiang Yang brelse(gdb); 59033afdcc5SYongqiang Yang } 59133afdcc5SYongqiang Yang 59233afdcc5SYongqiang Yang /* Zero out all of the reserved backup group descriptor 59333afdcc5SYongqiang Yang * table blocks 59433afdcc5SYongqiang Yang */ 59533afdcc5SYongqiang Yang if (ext4_bg_has_super(sb, group)) { 59633afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, gdblocks + start + 1, 59733afdcc5SYongqiang Yang reserved_gdb, GFP_NOFS); 59833afdcc5SYongqiang Yang if (err) 59933afdcc5SYongqiang Yang goto out; 60033afdcc5SYongqiang Yang } 60133afdcc5SYongqiang Yang 6026df935adSYongqiang Yang handle_itb: 60333afdcc5SYongqiang Yang /* Initialize group tables of the grop @group */ 60433afdcc5SYongqiang Yang if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) 60533afdcc5SYongqiang Yang goto handle_bb; 60633afdcc5SYongqiang Yang 60733afdcc5SYongqiang Yang /* Zero out all of the inode table blocks */ 60833afdcc5SYongqiang Yang block = group_data[i].inode_table; 60933afdcc5SYongqiang Yang ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", 61033afdcc5SYongqiang Yang block, sbi->s_itb_per_group); 61133afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, 61233afdcc5SYongqiang Yang GFP_NOFS); 61333afdcc5SYongqiang Yang if (err) 61433afdcc5SYongqiang Yang goto out; 61533afdcc5SYongqiang Yang 61633afdcc5SYongqiang Yang handle_bb: 61733afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) 61833afdcc5SYongqiang Yang goto handle_ib; 61933afdcc5SYongqiang Yang 62033afdcc5SYongqiang Yang /* Initialize block bitmap of the @group */ 62133afdcc5SYongqiang Yang block = group_data[i].block_bitmap; 62283448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 623a4130367SJan Kara if (err < 0) 62433afdcc5SYongqiang Yang goto out; 62533afdcc5SYongqiang Yang 62633afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 62733afdcc5SYongqiang Yang if (IS_ERR(bh)) { 62833afdcc5SYongqiang Yang err = PTR_ERR(bh); 62933afdcc5SYongqiang Yang goto out; 63033afdcc5SYongqiang Yang } 63101f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group); 63201f795f9SYongqiang Yang if (overhead != 0) { 63333afdcc5SYongqiang Yang ext4_debug("mark backup superblock %#04llx (+0)\n", 63433afdcc5SYongqiang Yang start); 635d77147ffSharshads ext4_set_bits(bh->b_data, 0, 636d77147ffSharshads EXT4_NUM_B2C(sbi, overhead)); 63733afdcc5SYongqiang Yang } 638d77147ffSharshads ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), 63933afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 64033afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6419e402893SVasily Averin brelse(bh); 64233afdcc5SYongqiang Yang if (err) 64333afdcc5SYongqiang Yang goto out; 64433afdcc5SYongqiang Yang 64533afdcc5SYongqiang Yang handle_ib: 64633afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_INODE_UNINIT) 64733afdcc5SYongqiang Yang continue; 64833afdcc5SYongqiang Yang 64933afdcc5SYongqiang Yang /* Initialize inode bitmap of the @group */ 65033afdcc5SYongqiang Yang block = group_data[i].inode_bitmap; 65183448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 652a4130367SJan Kara if (err < 0) 65333afdcc5SYongqiang Yang goto out; 65433afdcc5SYongqiang Yang /* Mark unused entries in inode bitmap used */ 65533afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 65633afdcc5SYongqiang Yang if (IS_ERR(bh)) { 65733afdcc5SYongqiang Yang err = PTR_ERR(bh); 65833afdcc5SYongqiang Yang goto out; 65933afdcc5SYongqiang Yang } 66033afdcc5SYongqiang Yang 66133afdcc5SYongqiang Yang ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), 66233afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 66333afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6649e402893SVasily Averin brelse(bh); 66533afdcc5SYongqiang Yang if (err) 66633afdcc5SYongqiang Yang goto out; 66733afdcc5SYongqiang Yang } 66833afdcc5SYongqiang Yang 66933afdcc5SYongqiang Yang /* Mark group tables in block bitmap */ 67033afdcc5SYongqiang Yang for (j = 0; j < GROUP_TABLE_COUNT; j++) { 67133afdcc5SYongqiang Yang count = group_table_count[j]; 67233afdcc5SYongqiang Yang start = (&group_data[0].block_bitmap)[j]; 67333afdcc5SYongqiang Yang block = start; 67433afdcc5SYongqiang Yang for (i = 1; i < flex_gd->count; i++) { 67533afdcc5SYongqiang Yang block += group_table_count[j]; 67633afdcc5SYongqiang Yang if (block == (&group_data[i].block_bitmap)[j]) { 67733afdcc5SYongqiang Yang count += group_table_count[j]; 67833afdcc5SYongqiang Yang continue; 67933afdcc5SYongqiang Yang } 68033afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 681d77147ffSharshads flex_gd, 682d77147ffSharshads EXT4_B2C(sbi, start), 683d77147ffSharshads EXT4_B2C(sbi, 684d77147ffSharshads start + count 685d77147ffSharshads - 1)); 68633afdcc5SYongqiang Yang if (err) 68733afdcc5SYongqiang Yang goto out; 68833afdcc5SYongqiang Yang count = group_table_count[j]; 689b93c9535STheodore Ts'o start = (&group_data[i].block_bitmap)[j]; 69033afdcc5SYongqiang Yang block = start; 69133afdcc5SYongqiang Yang } 69233afdcc5SYongqiang Yang 69333afdcc5SYongqiang Yang if (count) { 69433afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 695d77147ffSharshads flex_gd, 696d77147ffSharshads EXT4_B2C(sbi, start), 697d77147ffSharshads EXT4_B2C(sbi, 698d77147ffSharshads start + count 699d77147ffSharshads - 1)); 70033afdcc5SYongqiang Yang if (err) 70133afdcc5SYongqiang Yang goto out; 70233afdcc5SYongqiang Yang } 70333afdcc5SYongqiang Yang } 70433afdcc5SYongqiang Yang 70533afdcc5SYongqiang Yang out: 70633afdcc5SYongqiang Yang err2 = ext4_journal_stop(handle); 70733afdcc5SYongqiang Yang if (err2 && !err) 70833afdcc5SYongqiang Yang err = err2; 70933afdcc5SYongqiang Yang 71033afdcc5SYongqiang Yang return err; 71133afdcc5SYongqiang Yang } 71233afdcc5SYongqiang Yang 71333afdcc5SYongqiang Yang /* 714ac27a0ecSDave Kleikamp * Iterate through the groups which hold BACKUP superblock/GDT copies in an 715617ba13bSMingming Cao * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before 716ac27a0ecSDave Kleikamp * calling this for the first time. In a sparse filesystem it will be the 717ac27a0ecSDave Kleikamp * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... 718ac27a0ecSDave Kleikamp * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... 719ac27a0ecSDave Kleikamp */ 720617ba13bSMingming Cao static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, 721ac27a0ecSDave Kleikamp unsigned *five, unsigned *seven) 722ac27a0ecSDave Kleikamp { 723ac27a0ecSDave Kleikamp unsigned *min = three; 724ac27a0ecSDave Kleikamp int mult = 3; 725ac27a0ecSDave Kleikamp unsigned ret; 726ac27a0ecSDave Kleikamp 727e2b911c5SDarrick J. Wong if (!ext4_has_feature_sparse_super(sb)) { 728ac27a0ecSDave Kleikamp ret = *min; 729ac27a0ecSDave Kleikamp *min += 1; 730ac27a0ecSDave Kleikamp return ret; 731ac27a0ecSDave Kleikamp } 732ac27a0ecSDave Kleikamp 733ac27a0ecSDave Kleikamp if (*five < *min) { 734ac27a0ecSDave Kleikamp min = five; 735ac27a0ecSDave Kleikamp mult = 5; 736ac27a0ecSDave Kleikamp } 737ac27a0ecSDave Kleikamp if (*seven < *min) { 738ac27a0ecSDave Kleikamp min = seven; 739ac27a0ecSDave Kleikamp mult = 7; 740ac27a0ecSDave Kleikamp } 741ac27a0ecSDave Kleikamp 742ac27a0ecSDave Kleikamp ret = *min; 743ac27a0ecSDave Kleikamp *min *= mult; 744ac27a0ecSDave Kleikamp 745ac27a0ecSDave Kleikamp return ret; 746ac27a0ecSDave Kleikamp } 747ac27a0ecSDave Kleikamp 748ac27a0ecSDave Kleikamp /* 749ac27a0ecSDave Kleikamp * Check that all of the backup GDT blocks are held in the primary GDT block. 750ac27a0ecSDave Kleikamp * It is assumed that they are stored in group order. Returns the number of 751ac27a0ecSDave Kleikamp * groups in current filesystem that have BACKUPS, or -ve error code. 752ac27a0ecSDave Kleikamp */ 753ac27a0ecSDave Kleikamp static int verify_reserved_gdb(struct super_block *sb, 754c72df9f9SYongqiang Yang ext4_group_t end, 755ac27a0ecSDave Kleikamp struct buffer_head *primary) 756ac27a0ecSDave Kleikamp { 757617ba13bSMingming Cao const ext4_fsblk_t blk = primary->b_blocknr; 758ac27a0ecSDave Kleikamp unsigned three = 1; 759ac27a0ecSDave Kleikamp unsigned five = 5; 760ac27a0ecSDave Kleikamp unsigned seven = 7; 761ac27a0ecSDave Kleikamp unsigned grp; 762ac27a0ecSDave Kleikamp __le32 *p = (__le32 *)primary->b_data; 763ac27a0ecSDave Kleikamp int gdbackups = 0; 764ac27a0ecSDave Kleikamp 765617ba13bSMingming Cao while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { 766bd81d8eeSLaurent Vivier if (le32_to_cpu(*p++) != 767bd81d8eeSLaurent Vivier grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ 76812062dddSEric Sandeen ext4_warning(sb, "reserved GDT %llu" 7692ae02107SMingming Cao " missing grp %d (%llu)", 770ac27a0ecSDave Kleikamp blk, grp, 771bd81d8eeSLaurent Vivier grp * 772bd81d8eeSLaurent Vivier (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 773bd81d8eeSLaurent Vivier blk); 774ac27a0ecSDave Kleikamp return -EINVAL; 775ac27a0ecSDave Kleikamp } 776617ba13bSMingming Cao if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) 777ac27a0ecSDave Kleikamp return -EFBIG; 778ac27a0ecSDave Kleikamp } 779ac27a0ecSDave Kleikamp 780ac27a0ecSDave Kleikamp return gdbackups; 781ac27a0ecSDave Kleikamp } 782ac27a0ecSDave Kleikamp 783ac27a0ecSDave Kleikamp /* 784ac27a0ecSDave Kleikamp * Called when we need to bring a reserved group descriptor table block into 785ac27a0ecSDave Kleikamp * use from the resize inode. The primary copy of the new GDT block currently 786ac27a0ecSDave Kleikamp * is an indirect block (under the double indirect block in the resize inode). 787ac27a0ecSDave Kleikamp * The new backup GDT blocks will be stored as leaf blocks in this indirect 788ac27a0ecSDave Kleikamp * block, in group order. Even though we know all the block numbers we need, 789ac27a0ecSDave Kleikamp * we check to ensure that the resize inode has actually reserved these blocks. 790ac27a0ecSDave Kleikamp * 791ac27a0ecSDave Kleikamp * Don't need to update the block bitmaps because the blocks are still in use. 792ac27a0ecSDave Kleikamp * 793ac27a0ecSDave Kleikamp * We get all of the error cases out of the way, so that we are sure to not 794ac27a0ecSDave Kleikamp * fail once we start modifying the data on disk, because JBD has no rollback. 795ac27a0ecSDave Kleikamp */ 796ac27a0ecSDave Kleikamp static int add_new_gdb(handle_t *handle, struct inode *inode, 7972f919710SYongqiang Yang ext4_group_t group) 798ac27a0ecSDave Kleikamp { 799ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 800617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 8012f919710SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 802617ba13bSMingming Cao ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; 803fb265c9cSTheodore Ts'o struct buffer_head **o_group_desc, **n_group_desc = NULL; 804fb265c9cSTheodore Ts'o struct buffer_head *dind = NULL; 805fb265c9cSTheodore Ts'o struct buffer_head *gdb_bh = NULL; 806ac27a0ecSDave Kleikamp int gdbackups; 807fb265c9cSTheodore Ts'o struct ext4_iloc iloc = { .bh = NULL }; 808ac27a0ecSDave Kleikamp __le32 *data; 809ac27a0ecSDave Kleikamp int err; 810ac27a0ecSDave Kleikamp 811ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 812ac27a0ecSDave Kleikamp printk(KERN_DEBUG 813617ba13bSMingming Cao "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", 814ac27a0ecSDave Kleikamp gdb_num); 815ac27a0ecSDave Kleikamp 816fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 817fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 818fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 819ac27a0ecSDave Kleikamp 820c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, gdb_bh); 8212f919710SYongqiang Yang if (gdbackups < 0) { 822ac27a0ecSDave Kleikamp err = gdbackups; 823fb265c9cSTheodore Ts'o goto errout; 824ac27a0ecSDave Kleikamp } 825ac27a0ecSDave Kleikamp 826617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 827fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 828fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 829fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 830fb265c9cSTheodore Ts'o dind = NULL; 831fb265c9cSTheodore Ts'o goto errout; 832ac27a0ecSDave Kleikamp } 833ac27a0ecSDave Kleikamp 834ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 835617ba13bSMingming Cao if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { 83612062dddSEric Sandeen ext4_warning(sb, "new group %u GDT block %llu not reserved", 8372f919710SYongqiang Yang group, gdblock); 838ac27a0ecSDave Kleikamp err = -EINVAL; 839fb265c9cSTheodore Ts'o goto errout; 840ac27a0ecSDave Kleikamp } 841ac27a0ecSDave Kleikamp 8425d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 843*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 844*188c299eSJan Kara EXT4_JTR_NONE); 845b4097142STheodore Ts'o if (unlikely(err)) 846fb265c9cSTheodore Ts'o goto errout; 847ac27a0ecSDave Kleikamp 8485d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 849*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 850b4097142STheodore Ts'o if (unlikely(err)) 851fb265c9cSTheodore Ts'o goto errout; 852ac27a0ecSDave Kleikamp 8535d601255Sliang xie BUFFER_TRACE(dind, "get_write_access"); 854*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, dind, EXT4_JTR_NONE); 855c9e87161SDinghao Liu if (unlikely(err)) { 856b4097142STheodore Ts'o ext4_std_error(sb, err); 857c9e87161SDinghao Liu goto errout; 858c9e87161SDinghao Liu } 859ac27a0ecSDave Kleikamp 860617ba13bSMingming Cao /* ext4_reserve_inode_write() gets a reference on the iloc */ 861b4097142STheodore Ts'o err = ext4_reserve_inode_write(handle, inode, &iloc); 862b4097142STheodore Ts'o if (unlikely(err)) 863fb265c9cSTheodore Ts'o goto errout; 864ac27a0ecSDave Kleikamp 86571b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 86671b565ceSTheodore Ts'o GFP_KERNEL); 867ac27a0ecSDave Kleikamp if (!n_group_desc) { 868ac27a0ecSDave Kleikamp err = -ENOMEM; 869f18a5f21STheodore Ts'o ext4_warning(sb, "not enough memory for %lu groups", 870f18a5f21STheodore Ts'o gdb_num + 1); 871fb265c9cSTheodore Ts'o goto errout; 872ac27a0ecSDave Kleikamp } 873ac27a0ecSDave Kleikamp 874ac27a0ecSDave Kleikamp /* 875ac27a0ecSDave Kleikamp * Finally, we have all of the possible failures behind us... 876ac27a0ecSDave Kleikamp * 877ac27a0ecSDave Kleikamp * Remove new GDT block from inode double-indirect block and clear out 878ac27a0ecSDave Kleikamp * the new GDT block for use (which also "frees" the backup GDT blocks 879ac27a0ecSDave Kleikamp * from the reserved inode). We don't need to change the bitmaps for 880ac27a0ecSDave Kleikamp * these blocks, because they are marked as in-use from being in the 881ac27a0ecSDave Kleikamp * reserved inode, and will become GDT blocks (primary and backup). 882ac27a0ecSDave Kleikamp */ 883617ba13bSMingming Cao data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; 884b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, dind); 885b4097142STheodore Ts'o if (unlikely(err)) { 886b4097142STheodore Ts'o ext4_std_error(sb, err); 887fb265c9cSTheodore Ts'o goto errout; 888b4097142STheodore Ts'o } 889d77147ffSharshads inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 890d77147ffSharshads (9 - EXT4_SB(sb)->s_cluster_bits); 891617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 8922f919710SYongqiang Yang memset(gdb_bh->b_data, 0, sb->s_blocksize); 8932f919710SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 894b4097142STheodore Ts'o if (unlikely(err)) { 895b4097142STheodore Ts'o ext4_std_error(sb, err); 8968c380ab4SPan Bian iloc.bh = NULL; 897fb265c9cSTheodore Ts'o goto errout; 898b4097142STheodore Ts'o } 899b4097142STheodore Ts'o brelse(dind); 900ac27a0ecSDave Kleikamp 9011d0c3924STheodore Ts'o rcu_read_lock(); 9021d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 903ac27a0ecSDave Kleikamp memcpy(n_group_desc, o_group_desc, 904617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9051d0c3924STheodore Ts'o rcu_read_unlock(); 9062f919710SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 9071d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 908617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count++; 9091d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 910ac27a0ecSDave Kleikamp 91105c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 912e8546d06SMarcin Slusarz le16_add_cpu(&es->s_reserved_gdt_blocks, -1); 91305c2c00fSJan Kara ext4_superblock_csum_set(sb); 91405c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 915a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 916b4097142STheodore Ts'o if (err) 917b4097142STheodore Ts'o ext4_std_error(sb, err); 918b4097142STheodore Ts'o return err; 919fb265c9cSTheodore Ts'o errout: 920b93b41d4SAl Viro kvfree(n_group_desc); 921ac27a0ecSDave Kleikamp brelse(iloc.bh); 922ac27a0ecSDave Kleikamp brelse(dind); 9232f919710SYongqiang Yang brelse(gdb_bh); 924ac27a0ecSDave Kleikamp 925617ba13bSMingming Cao ext4_debug("leaving with error %d\n", err); 926ac27a0ecSDave Kleikamp return err; 927ac27a0ecSDave Kleikamp } 928ac27a0ecSDave Kleikamp 929ac27a0ecSDave Kleikamp /* 93001f795f9SYongqiang Yang * add_new_gdb_meta_bg is the sister of add_new_gdb. 93101f795f9SYongqiang Yang */ 93201f795f9SYongqiang Yang static int add_new_gdb_meta_bg(struct super_block *sb, 93301f795f9SYongqiang Yang handle_t *handle, ext4_group_t group) { 93401f795f9SYongqiang Yang ext4_fsblk_t gdblock; 93501f795f9SYongqiang Yang struct buffer_head *gdb_bh; 93601f795f9SYongqiang Yang struct buffer_head **o_group_desc, **n_group_desc; 93701f795f9SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 93801f795f9SYongqiang Yang int err; 93901f795f9SYongqiang Yang 94001f795f9SYongqiang Yang gdblock = ext4_meta_bg_first_block_no(sb, group) + 94101f795f9SYongqiang Yang ext4_bg_has_super(sb, group); 942fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 943fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 944fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 94571b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 94671b565ceSTheodore Ts'o GFP_KERNEL); 94701f795f9SYongqiang Yang if (!n_group_desc) { 94861a9c11eSVasily Averin brelse(gdb_bh); 94901f795f9SYongqiang Yang err = -ENOMEM; 95001f795f9SYongqiang Yang ext4_warning(sb, "not enough memory for %lu groups", 95101f795f9SYongqiang Yang gdb_num + 1); 95201f795f9SYongqiang Yang return err; 95301f795f9SYongqiang Yang } 95401f795f9SYongqiang Yang 9551d0c3924STheodore Ts'o rcu_read_lock(); 9561d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 95701f795f9SYongqiang Yang memcpy(n_group_desc, o_group_desc, 95801f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9591d0c3924STheodore Ts'o rcu_read_unlock(); 96001f795f9SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 961d64264d6SLukas Czerner 962d64264d6SLukas Czerner BUFFER_TRACE(gdb_bh, "get_write_access"); 963*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 964d64264d6SLukas Czerner if (err) { 965d64264d6SLukas Czerner kvfree(n_group_desc); 966d64264d6SLukas Czerner brelse(gdb_bh); 967d64264d6SLukas Czerner return err; 968d64264d6SLukas Czerner } 969d64264d6SLukas Czerner 9701d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 97101f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count++; 9721d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 97301f795f9SYongqiang Yang return err; 97401f795f9SYongqiang Yang } 97501f795f9SYongqiang Yang 97601f795f9SYongqiang Yang /* 977ac27a0ecSDave Kleikamp * Called when we are adding a new group which has a backup copy of each of 978ac27a0ecSDave Kleikamp * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. 979ac27a0ecSDave Kleikamp * We need to add these reserved backup GDT blocks to the resize inode, so 980ac27a0ecSDave Kleikamp * that they are kept for future resizing and not allocated to files. 981ac27a0ecSDave Kleikamp * 982ac27a0ecSDave Kleikamp * Each reserved backup GDT block will go into a different indirect block. 983ac27a0ecSDave Kleikamp * The indirect blocks are actually the primary reserved GDT blocks, 984ac27a0ecSDave Kleikamp * so we know in advance what their block numbers are. We only get the 985ac27a0ecSDave Kleikamp * double-indirect block to verify it is pointing to the primary reserved 986ac27a0ecSDave Kleikamp * GDT blocks so we don't overwrite a data block by accident. The reserved 987ac27a0ecSDave Kleikamp * backup GDT blocks are stored in their reserved primary GDT block. 988ac27a0ecSDave Kleikamp */ 989ac27a0ecSDave Kleikamp static int reserve_backup_gdb(handle_t *handle, struct inode *inode, 990668f4dc5SYongqiang Yang ext4_group_t group) 991ac27a0ecSDave Kleikamp { 992ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 993617ba13bSMingming Cao int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 994d77147ffSharshads int cluster_bits = EXT4_SB(sb)->s_cluster_bits; 995ac27a0ecSDave Kleikamp struct buffer_head **primary; 996ac27a0ecSDave Kleikamp struct buffer_head *dind; 997617ba13bSMingming Cao struct ext4_iloc iloc; 998617ba13bSMingming Cao ext4_fsblk_t blk; 999ac27a0ecSDave Kleikamp __le32 *data, *end; 1000ac27a0ecSDave Kleikamp int gdbackups = 0; 1001ac27a0ecSDave Kleikamp int res, i; 1002ac27a0ecSDave Kleikamp int err; 1003ac27a0ecSDave Kleikamp 10046da2ec56SKees Cook primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); 1005ac27a0ecSDave Kleikamp if (!primary) 1006ac27a0ecSDave Kleikamp return -ENOMEM; 1007ac27a0ecSDave Kleikamp 1008617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 1009fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 1010fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 1011fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 1012fb265c9cSTheodore Ts'o dind = NULL; 1013ac27a0ecSDave Kleikamp goto exit_free; 1014ac27a0ecSDave Kleikamp } 1015ac27a0ecSDave Kleikamp 1016617ba13bSMingming Cao blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; 101794460093SJosef Bacik data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % 101894460093SJosef Bacik EXT4_ADDR_PER_BLOCK(sb)); 1019617ba13bSMingming Cao end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); 1020ac27a0ecSDave Kleikamp 1021ac27a0ecSDave Kleikamp /* Get each reserved primary GDT block and verify it holds backups */ 1022ac27a0ecSDave Kleikamp for (res = 0; res < reserved_gdb; res++, blk++) { 1023ac27a0ecSDave Kleikamp if (le32_to_cpu(*data) != blk) { 102412062dddSEric Sandeen ext4_warning(sb, "reserved block %llu" 1025ac27a0ecSDave Kleikamp " not at offset %ld", 1026ac27a0ecSDave Kleikamp blk, 1027ac27a0ecSDave Kleikamp (long)(data - (__le32 *)dind->b_data)); 1028ac27a0ecSDave Kleikamp err = -EINVAL; 1029ac27a0ecSDave Kleikamp goto exit_bh; 1030ac27a0ecSDave Kleikamp } 1031fb265c9cSTheodore Ts'o primary[res] = ext4_sb_bread(sb, blk, 0); 1032fb265c9cSTheodore Ts'o if (IS_ERR(primary[res])) { 1033fb265c9cSTheodore Ts'o err = PTR_ERR(primary[res]); 1034fb265c9cSTheodore Ts'o primary[res] = NULL; 1035ac27a0ecSDave Kleikamp goto exit_bh; 1036ac27a0ecSDave Kleikamp } 1037c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, primary[res]); 1038c72df9f9SYongqiang Yang if (gdbackups < 0) { 1039ac27a0ecSDave Kleikamp brelse(primary[res]); 1040ac27a0ecSDave Kleikamp err = gdbackups; 1041ac27a0ecSDave Kleikamp goto exit_bh; 1042ac27a0ecSDave Kleikamp } 1043ac27a0ecSDave Kleikamp if (++data >= end) 1044ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 1045ac27a0ecSDave Kleikamp } 1046ac27a0ecSDave Kleikamp 1047ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 10485d601255Sliang xie BUFFER_TRACE(primary[i], "get_write_access"); 1049*188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, primary[i], 1050*188c299eSJan Kara EXT4_JTR_NONE))) 1051ac27a0ecSDave Kleikamp goto exit_bh; 1052ac27a0ecSDave Kleikamp } 1053ac27a0ecSDave Kleikamp 1054617ba13bSMingming Cao if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) 1055ac27a0ecSDave Kleikamp goto exit_bh; 1056ac27a0ecSDave Kleikamp 1057ac27a0ecSDave Kleikamp /* 1058ac27a0ecSDave Kleikamp * Finally we can add each of the reserved backup GDT blocks from 1059ac27a0ecSDave Kleikamp * the new group to its reserved primary GDT block. 1060ac27a0ecSDave Kleikamp */ 1061668f4dc5SYongqiang Yang blk = group * EXT4_BLOCKS_PER_GROUP(sb); 1062ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 1063ac27a0ecSDave Kleikamp int err2; 1064ac27a0ecSDave Kleikamp data = (__le32 *)primary[i]->b_data; 1065ac27a0ecSDave Kleikamp /* printk("reserving backup %lu[%u] = %lu\n", 1066ac27a0ecSDave Kleikamp primary[i]->b_blocknr, gdbackups, 1067ac27a0ecSDave Kleikamp blk + primary[i]->b_blocknr); */ 1068ac27a0ecSDave Kleikamp data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); 10690390131bSFrank Mayhar err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); 1070ac27a0ecSDave Kleikamp if (!err) 1071ac27a0ecSDave Kleikamp err = err2; 1072ac27a0ecSDave Kleikamp } 1073d77147ffSharshads 1074d77147ffSharshads inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); 1075617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 1076ac27a0ecSDave Kleikamp 1077ac27a0ecSDave Kleikamp exit_bh: 1078ac27a0ecSDave Kleikamp while (--res >= 0) 1079ac27a0ecSDave Kleikamp brelse(primary[res]); 1080ac27a0ecSDave Kleikamp brelse(dind); 1081ac27a0ecSDave Kleikamp 1082ac27a0ecSDave Kleikamp exit_free: 1083ac27a0ecSDave Kleikamp kfree(primary); 1084ac27a0ecSDave Kleikamp 1085ac27a0ecSDave Kleikamp return err; 1086ac27a0ecSDave Kleikamp } 1087ac27a0ecSDave Kleikamp 1088ac27a0ecSDave Kleikamp /* 1089617ba13bSMingming Cao * Update the backup copies of the ext4 metadata. These don't need to be part 1090ac27a0ecSDave Kleikamp * of the main resize transaction, because e2fsck will re-write them if there 1091ac27a0ecSDave Kleikamp * is a problem (basically only OOM will cause a problem). However, we 1092ac27a0ecSDave Kleikamp * _should_ update the backups if possible, in case the primary gets trashed 1093ac27a0ecSDave Kleikamp * for some reason and we need to run e2fsck from a backup superblock. The 1094ac27a0ecSDave Kleikamp * important part is that the new block and inode counts are in the backup 1095ac27a0ecSDave Kleikamp * superblocks, and the location of the new group metadata in the GDT backups. 1096ac27a0ecSDave Kleikamp * 109732ed5058STheodore Ts'o * We do not need take the s_resize_lock for this, because these 109832ed5058STheodore Ts'o * blocks are not otherwise touched by the filesystem code when it is 109932ed5058STheodore Ts'o * mounted. We don't need to worry about last changing from 110032ed5058STheodore Ts'o * sbi->s_groups_count, because the worst that can happen is that we 110132ed5058STheodore Ts'o * do not copy the full number of backups at this time. The resize 110232ed5058STheodore Ts'o * which changed s_groups_count will backup again. 1103ac27a0ecSDave Kleikamp */ 1104904dad47SAndy Leiserson static void update_backups(struct super_block *sb, sector_t blk_off, char *data, 110501f795f9SYongqiang Yang int size, int meta_bg) 1106ac27a0ecSDave Kleikamp { 1107617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 110801f795f9SYongqiang Yang ext4_group_t last; 1109617ba13bSMingming Cao const int bpg = EXT4_BLOCKS_PER_GROUP(sb); 1110ac27a0ecSDave Kleikamp unsigned three = 1; 1111ac27a0ecSDave Kleikamp unsigned five = 5; 1112ac27a0ecSDave Kleikamp unsigned seven = 7; 111301f795f9SYongqiang Yang ext4_group_t group = 0; 1114ac27a0ecSDave Kleikamp int rest = sb->s_blocksize - size; 1115ac27a0ecSDave Kleikamp handle_t *handle; 1116ac27a0ecSDave Kleikamp int err = 0, err2; 1117ac27a0ecSDave Kleikamp 11189924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 1119ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1120ac27a0ecSDave Kleikamp group = 1; 1121ac27a0ecSDave Kleikamp err = PTR_ERR(handle); 1122ac27a0ecSDave Kleikamp goto exit_err; 1123ac27a0ecSDave Kleikamp } 1124ac27a0ecSDave Kleikamp 112501f795f9SYongqiang Yang if (meta_bg == 0) { 112601f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 112701f795f9SYongqiang Yang last = sbi->s_groups_count; 112801f795f9SYongqiang Yang } else { 1129904dad47SAndy Leiserson group = ext4_get_group_number(sb, blk_off) + 1; 113001f795f9SYongqiang Yang last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); 113101f795f9SYongqiang Yang } 113201f795f9SYongqiang Yang 113301f795f9SYongqiang Yang while (group < sbi->s_groups_count) { 1134ac27a0ecSDave Kleikamp struct buffer_head *bh; 113501f795f9SYongqiang Yang ext4_fsblk_t backup_block; 1136ac27a0ecSDave Kleikamp 1137ac27a0ecSDave Kleikamp /* Out of journal space, and can't get more - abort - so sad */ 113883448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 1139a4130367SJan Kara if (err < 0) 1140ac27a0ecSDave Kleikamp break; 1141ac27a0ecSDave Kleikamp 114201f795f9SYongqiang Yang if (meta_bg == 0) 11439378c676SJan Kara backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; 114401f795f9SYongqiang Yang else 114501f795f9SYongqiang Yang backup_block = (ext4_group_first_block_no(sb, group) + 114601f795f9SYongqiang Yang ext4_bg_has_super(sb, group)); 114701f795f9SYongqiang Yang 114801f795f9SYongqiang Yang bh = sb_getblk(sb, backup_block); 1149aebf0243SWang Shilong if (unlikely(!bh)) { 1150860d21e2STheodore Ts'o err = -ENOMEM; 1151ac27a0ecSDave Kleikamp break; 1152ac27a0ecSDave Kleikamp } 115301f795f9SYongqiang Yang ext4_debug("update metadata backup %llu(+%llu)\n", 115401f795f9SYongqiang Yang backup_block, backup_block - 115501f795f9SYongqiang Yang ext4_group_first_block_no(sb, group)); 11565d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1157*188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, bh, 1158*188c299eSJan Kara EXT4_JTR_NONE))) 1159ac27a0ecSDave Kleikamp break; 1160ac27a0ecSDave Kleikamp lock_buffer(bh); 1161ac27a0ecSDave Kleikamp memcpy(bh->b_data, data, size); 1162ac27a0ecSDave Kleikamp if (rest) 1163ac27a0ecSDave Kleikamp memset(bh->b_data + size, 0, rest); 1164ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 1165ac27a0ecSDave Kleikamp unlock_buffer(bh); 1166b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, bh); 1167b4097142STheodore Ts'o if (unlikely(err)) 1168b4097142STheodore Ts'o ext4_std_error(sb, err); 1169ac27a0ecSDave Kleikamp brelse(bh); 117001f795f9SYongqiang Yang 117101f795f9SYongqiang Yang if (meta_bg == 0) 117201f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 117301f795f9SYongqiang Yang else if (group == last) 117401f795f9SYongqiang Yang break; 117501f795f9SYongqiang Yang else 117601f795f9SYongqiang Yang group = last; 1177ac27a0ecSDave Kleikamp } 1178617ba13bSMingming Cao if ((err2 = ext4_journal_stop(handle)) && !err) 1179ac27a0ecSDave Kleikamp err = err2; 1180ac27a0ecSDave Kleikamp 1181ac27a0ecSDave Kleikamp /* 1182ac27a0ecSDave Kleikamp * Ugh! Need to have e2fsck write the backup copies. It is too 1183ac27a0ecSDave Kleikamp * late to revert the resize, we shouldn't fail just because of 1184ac27a0ecSDave Kleikamp * the backup copies (they are only needed in case of corruption). 1185ac27a0ecSDave Kleikamp * 1186ac27a0ecSDave Kleikamp * However, if we got here we have a journal problem too, so we 1187ac27a0ecSDave Kleikamp * can't really start a transaction to mark the superblock. 1188ac27a0ecSDave Kleikamp * Chicken out and just set the flag on the hope it will be written 1189ac27a0ecSDave Kleikamp * to disk, and if not - we will simply wait until next fsck. 1190ac27a0ecSDave Kleikamp */ 1191ac27a0ecSDave Kleikamp exit_err: 1192ac27a0ecSDave Kleikamp if (err) { 119312062dddSEric Sandeen ext4_warning(sb, "can't update backup for group %u (err %d), " 1194ac27a0ecSDave Kleikamp "forcing fsck on next reboot", group, err); 1195617ba13bSMingming Cao sbi->s_mount_state &= ~EXT4_VALID_FS; 1196617ba13bSMingming Cao sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1197ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 1198ac27a0ecSDave Kleikamp } 1199ac27a0ecSDave Kleikamp } 1200ac27a0ecSDave Kleikamp 1201bb08c1e7SYongqiang Yang /* 1202bb08c1e7SYongqiang Yang * ext4_add_new_descs() adds @count group descriptor of groups 1203bb08c1e7SYongqiang Yang * starting at @group 1204bb08c1e7SYongqiang Yang * 1205bb08c1e7SYongqiang Yang * @handle: journal handle 1206bb08c1e7SYongqiang Yang * @sb: super block 1207bb08c1e7SYongqiang Yang * @group: the group no. of the first group desc to be added 1208bb08c1e7SYongqiang Yang * @resize_inode: the resize inode 1209bb08c1e7SYongqiang Yang * @count: number of group descriptors to be added 1210bb08c1e7SYongqiang Yang */ 1211bb08c1e7SYongqiang Yang static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, 1212bb08c1e7SYongqiang Yang ext4_group_t group, struct inode *resize_inode, 1213bb08c1e7SYongqiang Yang ext4_group_t count) 1214bb08c1e7SYongqiang Yang { 1215bb08c1e7SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1216bb08c1e7SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 1217bb08c1e7SYongqiang Yang struct buffer_head *gdb_bh; 1218bb08c1e7SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 121901f795f9SYongqiang Yang int meta_bg; 1220bb08c1e7SYongqiang Yang 1221e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 1222bb08c1e7SYongqiang Yang for (i = 0; i < count; i++, group++) { 1223bb08c1e7SYongqiang Yang int reserved_gdb = ext4_bg_has_super(sb, group) ? 1224bb08c1e7SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1225bb08c1e7SYongqiang Yang 1226bb08c1e7SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1227bb08c1e7SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1228bb08c1e7SYongqiang Yang 1229bb08c1e7SYongqiang Yang /* 1230bb08c1e7SYongqiang Yang * We will only either add reserved group blocks to a backup group 1231bb08c1e7SYongqiang Yang * or remove reserved blocks for the first group in a new group block. 1232bb08c1e7SYongqiang Yang * Doing both would be mean more complex code, and sane people don't 1233bb08c1e7SYongqiang Yang * use non-sparse filesystems anymore. This is already checked above. 1234bb08c1e7SYongqiang Yang */ 1235bb08c1e7SYongqiang Yang if (gdb_off) { 12361d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 12371d0c3924STheodore Ts'o gdb_num); 12385d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 1239*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, 1240*188c299eSJan Kara EXT4_JTR_NONE); 1241bb08c1e7SYongqiang Yang 1242bb08c1e7SYongqiang Yang if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) 1243bb08c1e7SYongqiang Yang err = reserve_backup_gdb(handle, resize_inode, group); 124401f795f9SYongqiang Yang } else if (meta_bg != 0) { 124501f795f9SYongqiang Yang err = add_new_gdb_meta_bg(sb, handle, group); 124601f795f9SYongqiang Yang } else { 1247bb08c1e7SYongqiang Yang err = add_new_gdb(handle, resize_inode, group); 124801f795f9SYongqiang Yang } 1249bb08c1e7SYongqiang Yang if (err) 1250bb08c1e7SYongqiang Yang break; 1251bb08c1e7SYongqiang Yang } 1252bb08c1e7SYongqiang Yang return err; 1253bb08c1e7SYongqiang Yang } 1254bb08c1e7SYongqiang Yang 125541a246d1SDarrick J. Wong static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 125641a246d1SDarrick J. Wong { 125741a246d1SDarrick J. Wong struct buffer_head *bh = sb_getblk(sb, block); 1258aebf0243SWang Shilong if (unlikely(!bh)) 125941a246d1SDarrick J. Wong return NULL; 12607f1468d1SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 12612d069c08Szhangyi (F) if (ext4_read_bh(bh, 0, NULL) < 0) { 126241a246d1SDarrick J. Wong brelse(bh); 126341a246d1SDarrick J. Wong return NULL; 126441a246d1SDarrick J. Wong } 12657f1468d1SDmitry Monakhov } 126641a246d1SDarrick J. Wong 126741a246d1SDarrick J. Wong return bh; 126841a246d1SDarrick J. Wong } 126941a246d1SDarrick J. Wong 127041a246d1SDarrick J. Wong static int ext4_set_bitmap_checksums(struct super_block *sb, 127141a246d1SDarrick J. Wong ext4_group_t group, 127241a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 127341a246d1SDarrick J. Wong struct ext4_new_group_data *group_data) 127441a246d1SDarrick J. Wong { 127541a246d1SDarrick J. Wong struct buffer_head *bh; 127641a246d1SDarrick J. Wong 12779aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(sb)) 127841a246d1SDarrick J. Wong return 0; 127941a246d1SDarrick J. Wong 128041a246d1SDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->inode_bitmap); 128141a246d1SDarrick J. Wong if (!bh) 128241a246d1SDarrick J. Wong return -EIO; 128341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, bh, 128441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 128541a246d1SDarrick J. Wong brelse(bh); 128641a246d1SDarrick J. Wong 1287fa77dcfaSDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->block_bitmap); 1288fa77dcfaSDarrick J. Wong if (!bh) 1289fa77dcfaSDarrick J. Wong return -EIO; 129079f1ba49STao Ma ext4_block_bitmap_csum_set(sb, group, gdp, bh); 1291fa77dcfaSDarrick J. Wong brelse(bh); 1292fa77dcfaSDarrick J. Wong 129341a246d1SDarrick J. Wong return 0; 129441a246d1SDarrick J. Wong } 129541a246d1SDarrick J. Wong 1296083f5b24SYongqiang Yang /* 1297083f5b24SYongqiang Yang * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg 1298083f5b24SYongqiang Yang */ 1299083f5b24SYongqiang Yang static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, 1300083f5b24SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 1301083f5b24SYongqiang Yang { 1302083f5b24SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 1303083f5b24SYongqiang Yang struct ext4_group_desc *gdp; 1304083f5b24SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1305083f5b24SYongqiang Yang struct buffer_head *gdb_bh; 1306083f5b24SYongqiang Yang ext4_group_t group; 1307083f5b24SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 1308083f5b24SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1309083f5b24SYongqiang Yang 1310083f5b24SYongqiang Yang 1311083f5b24SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { 1312083f5b24SYongqiang Yang group = group_data->group; 1313083f5b24SYongqiang Yang 1314083f5b24SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1315083f5b24SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1316083f5b24SYongqiang Yang 1317083f5b24SYongqiang Yang /* 1318083f5b24SYongqiang Yang * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). 1319083f5b24SYongqiang Yang */ 13201d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); 1321083f5b24SYongqiang Yang /* Update group descriptor block for new group */ 13222716b802STheodore Ts'o gdp = (struct ext4_group_desc *)(gdb_bh->b_data + 1323083f5b24SYongqiang Yang gdb_off * EXT4_DESC_SIZE(sb)); 1324083f5b24SYongqiang Yang 1325083f5b24SYongqiang Yang memset(gdp, 0, EXT4_DESC_SIZE(sb)); 1326083f5b24SYongqiang Yang ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); 1327083f5b24SYongqiang Yang ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); 132841a246d1SDarrick J. Wong err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); 132941a246d1SDarrick J. Wong if (err) { 133041a246d1SDarrick J. Wong ext4_std_error(sb, err); 133141a246d1SDarrick J. Wong break; 133241a246d1SDarrick J. Wong } 133341a246d1SDarrick J. Wong 1334083f5b24SYongqiang Yang ext4_inode_table_set(sb, gdp, group_data->inode_table); 1335083f5b24SYongqiang Yang ext4_free_group_clusters_set(sb, gdp, 1336d77147ffSharshads group_data->free_clusters_count); 1337083f5b24SYongqiang Yang ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); 133893f90526STheodore Ts'o if (ext4_has_group_desc_csum(sb)) 133993f90526STheodore Ts'o ext4_itable_unused_set(sb, gdp, 134093f90526STheodore Ts'o EXT4_INODES_PER_GROUP(sb)); 1341083f5b24SYongqiang Yang gdp->bg_flags = cpu_to_le16(*bg_flags); 1342feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1343083f5b24SYongqiang Yang 1344083f5b24SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 1345083f5b24SYongqiang Yang if (unlikely(err)) { 1346083f5b24SYongqiang Yang ext4_std_error(sb, err); 1347083f5b24SYongqiang Yang break; 1348083f5b24SYongqiang Yang } 1349083f5b24SYongqiang Yang 1350083f5b24SYongqiang Yang /* 1351083f5b24SYongqiang Yang * We can allocate memory for mb_alloc based on the new group 1352083f5b24SYongqiang Yang * descriptor 1353083f5b24SYongqiang Yang */ 1354083f5b24SYongqiang Yang err = ext4_mb_add_groupinfo(sb, group, gdp); 1355083f5b24SYongqiang Yang if (err) 1356083f5b24SYongqiang Yang break; 1357083f5b24SYongqiang Yang } 1358083f5b24SYongqiang Yang return err; 1359083f5b24SYongqiang Yang } 1360083f5b24SYongqiang Yang 13612e10e2f2SYongqiang Yang /* 13622e10e2f2SYongqiang Yang * ext4_update_super() updates the super block so that the newly added 13632e10e2f2SYongqiang Yang * groups can be seen by the filesystem. 13642e10e2f2SYongqiang Yang * 13652e10e2f2SYongqiang Yang * @sb: super block 13662e10e2f2SYongqiang Yang * @flex_gd: new added groups 13672e10e2f2SYongqiang Yang */ 13682e10e2f2SYongqiang Yang static void ext4_update_super(struct super_block *sb, 13692e10e2f2SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 13702e10e2f2SYongqiang Yang { 13712e10e2f2SYongqiang Yang ext4_fsblk_t blocks_count = 0; 13722e10e2f2SYongqiang Yang ext4_fsblk_t free_blocks = 0; 13732e10e2f2SYongqiang Yang ext4_fsblk_t reserved_blocks = 0; 13742e10e2f2SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 13752e10e2f2SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 13762e10e2f2SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 13778a991849STheodore Ts'o int i; 13782e10e2f2SYongqiang Yang 13792e10e2f2SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 13802e10e2f2SYongqiang Yang /* 13812e10e2f2SYongqiang Yang * Make the new blocks and inodes valid next. We do this before 13822e10e2f2SYongqiang Yang * increasing the group count so that once the group is enabled, 13832e10e2f2SYongqiang Yang * all of its blocks and inodes are already valid. 13842e10e2f2SYongqiang Yang * 13852e10e2f2SYongqiang Yang * We always allocate group-by-group, then block-by-block or 13862e10e2f2SYongqiang Yang * inode-by-inode within a group, so enabling these 13872e10e2f2SYongqiang Yang * blocks/inodes before the group is live won't actually let us 13882e10e2f2SYongqiang Yang * allocate the new space yet. 13892e10e2f2SYongqiang Yang */ 13902e10e2f2SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 13912e10e2f2SYongqiang Yang blocks_count += group_data[i].blocks_count; 1392d77147ffSharshads free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); 13932e10e2f2SYongqiang Yang } 13942e10e2f2SYongqiang Yang 13952e10e2f2SYongqiang Yang reserved_blocks = ext4_r_blocks_count(es) * 100; 139601f795f9SYongqiang Yang reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); 13972e10e2f2SYongqiang Yang reserved_blocks *= blocks_count; 13982e10e2f2SYongqiang Yang do_div(reserved_blocks, 100); 13992e10e2f2SYongqiang Yang 140005c2c00fSJan Kara lock_buffer(sbi->s_sbh); 14012e10e2f2SYongqiang Yang ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); 1402636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); 14032e10e2f2SYongqiang Yang le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * 14042e10e2f2SYongqiang Yang flex_gd->count); 1405636d7e2eSDarrick J. Wong le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * 1406636d7e2eSDarrick J. Wong flex_gd->count); 14072e10e2f2SYongqiang Yang 140801f795f9SYongqiang Yang ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); 14092e10e2f2SYongqiang Yang /* 14102e10e2f2SYongqiang Yang * We need to protect s_groups_count against other CPUs seeing 14112e10e2f2SYongqiang Yang * inconsistent state in the superblock. 14122e10e2f2SYongqiang Yang * 14132e10e2f2SYongqiang Yang * The precise rules we use are: 14142e10e2f2SYongqiang Yang * 14152e10e2f2SYongqiang Yang * * Writers must perform a smp_wmb() after updating all 14162e10e2f2SYongqiang Yang * dependent data and before modifying the groups count 14172e10e2f2SYongqiang Yang * 14182e10e2f2SYongqiang Yang * * Readers must perform an smp_rmb() after reading the groups 14192e10e2f2SYongqiang Yang * count and before reading any dependent data. 14202e10e2f2SYongqiang Yang * 14212e10e2f2SYongqiang Yang * NB. These rules can be relaxed when checking the group count 14222e10e2f2SYongqiang Yang * while freeing data, as we can only allocate from a block 14232e10e2f2SYongqiang Yang * group after serialising against the group count, and we can 14242e10e2f2SYongqiang Yang * only then free after serialising in turn against that 14252e10e2f2SYongqiang Yang * allocation. 14262e10e2f2SYongqiang Yang */ 14272e10e2f2SYongqiang Yang smp_wmb(); 14282e10e2f2SYongqiang Yang 14292e10e2f2SYongqiang Yang /* Update the global fs size fields */ 14302e10e2f2SYongqiang Yang sbi->s_groups_count += flex_gd->count; 1431c5c72d81STheodore Ts'o sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 1432c5c72d81STheodore Ts'o (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 14332e10e2f2SYongqiang Yang 14342e10e2f2SYongqiang Yang /* Update the reserved block counts only once the new group is 14352e10e2f2SYongqiang Yang * active. */ 14362e10e2f2SYongqiang Yang ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + 14372e10e2f2SYongqiang Yang reserved_blocks); 143805c2c00fSJan Kara ext4_superblock_csum_set(sb); 143905c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 14402e10e2f2SYongqiang Yang 14412e10e2f2SYongqiang Yang /* Update the free space counts */ 14422e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeclusters_counter, 1443810da240SLukas Czerner EXT4_NUM_B2C(sbi, free_blocks)); 14442e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeinodes_counter, 14452e10e2f2SYongqiang Yang EXT4_INODES_PER_GROUP(sb) * flex_gd->count); 14462e10e2f2SYongqiang Yang 144701f795f9SYongqiang Yang ext4_debug("free blocks count %llu", 144801f795f9SYongqiang Yang percpu_counter_read(&sbi->s_freeclusters_counter)); 1449e2b911c5SDarrick J. Wong if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { 14502e10e2f2SYongqiang Yang ext4_group_t flex_group; 14517c990728SSuraj Jitindar Singh struct flex_groups *fg; 14527c990728SSuraj Jitindar Singh 14532e10e2f2SYongqiang Yang flex_group = ext4_flex_group(sbi, group_data[0].group); 14547c990728SSuraj Jitindar Singh fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); 145590ba983fSTheodore Ts'o atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), 14567c990728SSuraj Jitindar Singh &fg->free_clusters); 14572e10e2f2SYongqiang Yang atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, 14587c990728SSuraj Jitindar Singh &fg->free_inodes); 14592e10e2f2SYongqiang Yang } 14602e10e2f2SYongqiang Yang 1461952fc18eSTheodore Ts'o /* 1462952fc18eSTheodore Ts'o * Update the fs overhead information 1463952fc18eSTheodore Ts'o */ 1464952fc18eSTheodore Ts'o ext4_calculate_overhead(sb); 1465952fc18eSTheodore Ts'o 14662e10e2f2SYongqiang Yang if (test_opt(sb, DEBUG)) 14672e10e2f2SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: added group %u:" 14682e10e2f2SYongqiang Yang "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, 14692e10e2f2SYongqiang Yang blocks_count, free_blocks, reserved_blocks); 14702e10e2f2SYongqiang Yang } 14712e10e2f2SYongqiang Yang 14724bac1f8cSYongqiang Yang /* Add a flex group to an fs. Ensure we handle all possible error conditions 14734bac1f8cSYongqiang Yang * _before_ we start modifying the filesystem, because we cannot abort the 14744bac1f8cSYongqiang Yang * transaction and not have it write the data to disk. 14754bac1f8cSYongqiang Yang */ 14764bac1f8cSYongqiang Yang static int ext4_flex_group_add(struct super_block *sb, 14774bac1f8cSYongqiang Yang struct inode *resize_inode, 14784bac1f8cSYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 14794bac1f8cSYongqiang Yang { 14804bac1f8cSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 14814bac1f8cSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 14824bac1f8cSYongqiang Yang ext4_fsblk_t o_blocks_count; 14834bac1f8cSYongqiang Yang ext4_grpblk_t last; 14844bac1f8cSYongqiang Yang ext4_group_t group; 14854bac1f8cSYongqiang Yang handle_t *handle; 14864bac1f8cSYongqiang Yang unsigned reserved_gdb; 14874bac1f8cSYongqiang Yang int err = 0, err2 = 0, credit; 14884bac1f8cSYongqiang Yang 14894bac1f8cSYongqiang Yang BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); 14904bac1f8cSYongqiang Yang 14914bac1f8cSYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 14924bac1f8cSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 14934bac1f8cSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 14944bac1f8cSYongqiang Yang BUG_ON(last); 14954bac1f8cSYongqiang Yang 14964bac1f8cSYongqiang Yang err = setup_new_flex_group_blocks(sb, flex_gd); 14974bac1f8cSYongqiang Yang if (err) 14984bac1f8cSYongqiang Yang goto exit; 14994bac1f8cSYongqiang Yang /* 15004bac1f8cSYongqiang Yang * We will always be modifying at least the superblock and GDT 15012c869b26SJan Kara * blocks. If we are adding a group past the last current GDT block, 15024bac1f8cSYongqiang Yang * we will also modify the inode and the dindirect block. If we 15034bac1f8cSYongqiang Yang * are adding a group with superblock/GDT backups we will also 15044bac1f8cSYongqiang Yang * modify each of the reserved GDT dindirect blocks. 15054bac1f8cSYongqiang Yang */ 15062c869b26SJan Kara credit = 3; /* sb, resize inode, resize inode dindirect */ 15072c869b26SJan Kara /* GDT blocks */ 15082c869b26SJan Kara credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); 15092c869b26SJan Kara credit += reserved_gdb; /* Reserved GDT dindirect blocks */ 15109924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); 15114bac1f8cSYongqiang Yang if (IS_ERR(handle)) { 15124bac1f8cSYongqiang Yang err = PTR_ERR(handle); 15134bac1f8cSYongqiang Yang goto exit; 15144bac1f8cSYongqiang Yang } 15154bac1f8cSYongqiang Yang 15165d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1517*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1518*188c299eSJan Kara EXT4_JTR_NONE); 15194bac1f8cSYongqiang Yang if (err) 15204bac1f8cSYongqiang Yang goto exit_journal; 15214bac1f8cSYongqiang Yang 15224bac1f8cSYongqiang Yang group = flex_gd->groups[0].group; 152349598e04SJun Piao BUG_ON(group != sbi->s_groups_count); 15244bac1f8cSYongqiang Yang err = ext4_add_new_descs(handle, sb, group, 15254bac1f8cSYongqiang Yang resize_inode, flex_gd->count); 15264bac1f8cSYongqiang Yang if (err) 15274bac1f8cSYongqiang Yang goto exit_journal; 15284bac1f8cSYongqiang Yang 15294bac1f8cSYongqiang Yang err = ext4_setup_new_descs(handle, sb, flex_gd); 15304bac1f8cSYongqiang Yang if (err) 15314bac1f8cSYongqiang Yang goto exit_journal; 15324bac1f8cSYongqiang Yang 15334bac1f8cSYongqiang Yang ext4_update_super(sb, flex_gd); 15344bac1f8cSYongqiang Yang 1535a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 15364bac1f8cSYongqiang Yang 15374bac1f8cSYongqiang Yang exit_journal: 15384bac1f8cSYongqiang Yang err2 = ext4_journal_stop(handle); 15394bac1f8cSYongqiang Yang if (!err) 15404bac1f8cSYongqiang Yang err = err2; 15414bac1f8cSYongqiang Yang 15424bac1f8cSYongqiang Yang if (!err) { 15432ebd1704SYongqiang Yang int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 15442ebd1704SYongqiang Yang int gdb_num_end = ((group + flex_gd->count - 1) / 15452ebd1704SYongqiang Yang EXT4_DESC_PER_BLOCK(sb)); 1546e2b911c5SDarrick J. Wong int meta_bg = ext4_has_feature_meta_bg(sb); 15470acdb887STao Ma sector_t old_gdb = 0; 15482ebd1704SYongqiang Yang 15494bac1f8cSYongqiang Yang update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, 155001f795f9SYongqiang Yang sizeof(struct ext4_super_block), 0); 15512ebd1704SYongqiang Yang for (; gdb_num <= gdb_num_end; gdb_num++) { 15524bac1f8cSYongqiang Yang struct buffer_head *gdb_bh; 15532ebd1704SYongqiang Yang 15541d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 15551d0c3924STheodore Ts'o gdb_num); 15560acdb887STao Ma if (old_gdb == gdb_bh->b_blocknr) 15570acdb887STao Ma continue; 15584bac1f8cSYongqiang Yang update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, 155901f795f9SYongqiang Yang gdb_bh->b_size, meta_bg); 15600acdb887STao Ma old_gdb = gdb_bh->b_blocknr; 15614bac1f8cSYongqiang Yang } 15624bac1f8cSYongqiang Yang } 15634bac1f8cSYongqiang Yang exit: 15644bac1f8cSYongqiang Yang return err; 15654bac1f8cSYongqiang Yang } 15664bac1f8cSYongqiang Yang 156719c5246dSYongqiang Yang static int ext4_setup_next_flex_gd(struct super_block *sb, 156819c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 156919c5246dSYongqiang Yang ext4_fsblk_t n_blocks_count, 157019c5246dSYongqiang Yang unsigned long flexbg_size) 157119c5246dSYongqiang Yang { 1572d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 1573d77147ffSharshads struct ext4_super_block *es = sbi->s_es; 157419c5246dSYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 157519c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 157619c5246dSYongqiang Yang ext4_group_t n_group; 157719c5246dSYongqiang Yang ext4_group_t group; 157819c5246dSYongqiang Yang ext4_group_t last_group; 157919c5246dSYongqiang Yang ext4_grpblk_t last; 1580d77147ffSharshads ext4_grpblk_t clusters_per_group; 158119c5246dSYongqiang Yang unsigned long i; 158219c5246dSYongqiang Yang 1583d77147ffSharshads clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); 158419c5246dSYongqiang Yang 158519c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 158619c5246dSYongqiang Yang 158719c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 158819c5246dSYongqiang Yang return 0; 158919c5246dSYongqiang Yang 159019c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 159119c5246dSYongqiang Yang BUG_ON(last); 159219c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); 159319c5246dSYongqiang Yang 159419c5246dSYongqiang Yang last_group = group | (flexbg_size - 1); 159519c5246dSYongqiang Yang if (last_group > n_group) 159619c5246dSYongqiang Yang last_group = n_group; 159719c5246dSYongqiang Yang 159819c5246dSYongqiang Yang flex_gd->count = last_group - group + 1; 159919c5246dSYongqiang Yang 160019c5246dSYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 160119c5246dSYongqiang Yang int overhead; 160219c5246dSYongqiang Yang 160319c5246dSYongqiang Yang group_data[i].group = group + i; 1604d77147ffSharshads group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); 160501f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group + i); 1606d77147ffSharshads group_data[i].mdata_blocks = overhead; 1607d77147ffSharshads group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); 16087f511862STheodore Ts'o if (ext4_has_group_desc_csum(sb)) { 160919c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | 161019c5246dSYongqiang Yang EXT4_BG_INODE_UNINIT; 16117f511862STheodore Ts'o if (!test_opt(sb, INIT_INODE_TABLE)) 16127f511862STheodore Ts'o flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; 16137f511862STheodore Ts'o } else 161419c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; 161519c5246dSYongqiang Yang } 161619c5246dSYongqiang Yang 1617feb0ab32SDarrick J. Wong if (last_group == n_group && ext4_has_group_desc_csum(sb)) 161819c5246dSYongqiang Yang /* We need to initialize block bitmap of last group. */ 161919c5246dSYongqiang Yang flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; 162019c5246dSYongqiang Yang 1621d77147ffSharshads if ((last_group == n_group) && (last != clusters_per_group - 1)) { 1622d77147ffSharshads group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); 1623d77147ffSharshads group_data[i - 1].free_clusters_count -= clusters_per_group - 162419c5246dSYongqiang Yang last - 1; 162519c5246dSYongqiang Yang } 162619c5246dSYongqiang Yang 162719c5246dSYongqiang Yang return 1; 162819c5246dSYongqiang Yang } 162919c5246dSYongqiang Yang 1630ac27a0ecSDave Kleikamp /* Add group descriptor data to an existing or new group descriptor block. 1631ac27a0ecSDave Kleikamp * Ensure we handle all possible error conditions _before_ we start modifying 1632ac27a0ecSDave Kleikamp * the filesystem, because we cannot abort the transaction and not have it 1633ac27a0ecSDave Kleikamp * write the data to disk. 1634ac27a0ecSDave Kleikamp * 1635ac27a0ecSDave Kleikamp * If we are on a GDT block boundary, we need to get the reserved GDT block. 1636ac27a0ecSDave Kleikamp * Otherwise, we may need to add backup GDT blocks for a sparse group. 1637ac27a0ecSDave Kleikamp * 1638ac27a0ecSDave Kleikamp * We only need to hold the superblock lock while we are actually adding 1639ac27a0ecSDave Kleikamp * in the new group's counts to the superblock. Prior to that we have 1640ac27a0ecSDave Kleikamp * not really "added" the group at all. We re-check that we are still 1641ac27a0ecSDave Kleikamp * adding in the last group in case things have changed since verifying. 1642ac27a0ecSDave Kleikamp */ 1643617ba13bSMingming Cao int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 1644ac27a0ecSDave Kleikamp { 164561f296ccSYongqiang Yang struct ext4_new_flex_group_data flex_gd; 1646617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1647617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 1648617ba13bSMingming Cao int reserved_gdb = ext4_bg_has_super(sb, input->group) ? 1649ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1650ac27a0ecSDave Kleikamp struct inode *inode = NULL; 165103b40e34SJon Ernst int gdb_off; 165261f296ccSYongqiang Yang int err; 165361f296ccSYongqiang Yang __u16 bg_flags = 0; 1654ac27a0ecSDave Kleikamp 1655617ba13bSMingming Cao gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); 1656ac27a0ecSDave Kleikamp 1657e2b911c5SDarrick J. Wong if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { 165812062dddSEric Sandeen ext4_warning(sb, "Can't resize non-sparse filesystem further"); 1659ac27a0ecSDave Kleikamp return -EPERM; 1660ac27a0ecSDave Kleikamp } 1661ac27a0ecSDave Kleikamp 1662bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) + input->blocks_count < 1663bd81d8eeSLaurent Vivier ext4_blocks_count(es)) { 166412062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1665ac27a0ecSDave Kleikamp return -EINVAL; 1666ac27a0ecSDave Kleikamp } 1667ac27a0ecSDave Kleikamp 1668617ba13bSMingming Cao if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < 1669ac27a0ecSDave Kleikamp le32_to_cpu(es->s_inodes_count)) { 167012062dddSEric Sandeen ext4_warning(sb, "inodes_count overflow"); 1671ac27a0ecSDave Kleikamp return -EINVAL; 1672ac27a0ecSDave Kleikamp } 1673ac27a0ecSDave Kleikamp 1674ac27a0ecSDave Kleikamp if (reserved_gdb || gdb_off == 0) { 1675e647e291Sruippan (潘睿) if (!ext4_has_feature_resize_inode(sb) || 1676e2b911c5SDarrick J. Wong !le16_to_cpu(es->s_reserved_gdt_blocks)) { 167712062dddSEric Sandeen ext4_warning(sb, 1678ac27a0ecSDave Kleikamp "No reserved GDT blocks, can't resize"); 1679ac27a0ecSDave Kleikamp return -EPERM; 1680ac27a0ecSDave Kleikamp } 16818a363970STheodore Ts'o inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); 16821d1fe1eeSDavid Howells if (IS_ERR(inode)) { 168312062dddSEric Sandeen ext4_warning(sb, "Error opening resize inode"); 16841d1fe1eeSDavid Howells return PTR_ERR(inode); 1685ac27a0ecSDave Kleikamp } 1686ac27a0ecSDave Kleikamp } 1687ac27a0ecSDave Kleikamp 1688920313a7SAneesh Kumar K.V 168961f296ccSYongqiang Yang err = verify_group_input(sb, input); 1690668f4dc5SYongqiang Yang if (err) 169161f296ccSYongqiang Yang goto out; 1692ac27a0ecSDave Kleikamp 1693117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, input->group + 1); 1694117fff10STheodore Ts'o if (err) 16957f511862STheodore Ts'o goto out; 1696117fff10STheodore Ts'o 169728623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, input->group + 1); 169828623c2fSTheodore Ts'o if (err) 169928623c2fSTheodore Ts'o goto out; 170028623c2fSTheodore Ts'o 170161f296ccSYongqiang Yang flex_gd.count = 1; 170261f296ccSYongqiang Yang flex_gd.groups = input; 170361f296ccSYongqiang Yang flex_gd.bg_flags = &bg_flags; 170461f296ccSYongqiang Yang err = ext4_flex_group_add(sb, inode, &flex_gd); 170561f296ccSYongqiang Yang out: 1706ac27a0ecSDave Kleikamp iput(inode); 1707ac27a0ecSDave Kleikamp return err; 1708617ba13bSMingming Cao } /* ext4_group_add */ 1709ac27a0ecSDave Kleikamp 17102b2d6d01STheodore Ts'o /* 171118e31438SYongqiang Yang * extend a group without checking assuming that checking has been done. 171218e31438SYongqiang Yang */ 171318e31438SYongqiang Yang static int ext4_group_extend_no_check(struct super_block *sb, 171418e31438SYongqiang Yang ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) 171518e31438SYongqiang Yang { 171618e31438SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 171718e31438SYongqiang Yang handle_t *handle; 171818e31438SYongqiang Yang int err = 0, err2; 171918e31438SYongqiang Yang 172018e31438SYongqiang Yang /* We will update the superblock, one block bitmap, and 172118e31438SYongqiang Yang * one group descriptor via ext4_group_add_blocks(). 172218e31438SYongqiang Yang */ 17239924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); 172418e31438SYongqiang Yang if (IS_ERR(handle)) { 172518e31438SYongqiang Yang err = PTR_ERR(handle); 172618e31438SYongqiang Yang ext4_warning(sb, "error %d on journal start", err); 172718e31438SYongqiang Yang return err; 172818e31438SYongqiang Yang } 172918e31438SYongqiang Yang 17305d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 1731*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 1732*188c299eSJan Kara EXT4_JTR_NONE); 173318e31438SYongqiang Yang if (err) { 173418e31438SYongqiang Yang ext4_warning(sb, "error %d on journal write access", err); 173518e31438SYongqiang Yang goto errout; 173618e31438SYongqiang Yang } 173718e31438SYongqiang Yang 173805c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 173918e31438SYongqiang Yang ext4_blocks_count_set(es, o_blocks_count + add); 1740636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); 174105c2c00fSJan Kara ext4_superblock_csum_set(sb); 174205c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 174318e31438SYongqiang Yang ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, 174418e31438SYongqiang Yang o_blocks_count + add); 174518e31438SYongqiang Yang /* We add the blocks to the bitmap and set the group need init bit */ 174618e31438SYongqiang Yang err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); 174718e31438SYongqiang Yang if (err) 174818e31438SYongqiang Yang goto errout; 1749a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 175018e31438SYongqiang Yang ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, 175118e31438SYongqiang Yang o_blocks_count + add); 175218e31438SYongqiang Yang errout: 175318e31438SYongqiang Yang err2 = ext4_journal_stop(handle); 175418e31438SYongqiang Yang if (err2 && !err) 175518e31438SYongqiang Yang err = err2; 175618e31438SYongqiang Yang 175718e31438SYongqiang Yang if (!err) { 175818e31438SYongqiang Yang if (test_opt(sb, DEBUG)) 175918e31438SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: extended group to %llu " 176018e31438SYongqiang Yang "blocks\n", ext4_blocks_count(es)); 17616ca792edSMaarten ter Huurne update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, 176201f795f9SYongqiang Yang (char *)es, sizeof(struct ext4_super_block), 0); 176318e31438SYongqiang Yang } 176418e31438SYongqiang Yang return err; 176518e31438SYongqiang Yang } 176618e31438SYongqiang Yang 176718e31438SYongqiang Yang /* 17682b2d6d01STheodore Ts'o * Extend the filesystem to the new number of blocks specified. This entry 1769ac27a0ecSDave Kleikamp * point is only used to extend the current filesystem to the end of the last 1770ac27a0ecSDave Kleikamp * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" 1771ac27a0ecSDave Kleikamp * for emergencies (because it has no dependencies on reserved blocks). 1772ac27a0ecSDave Kleikamp * 1773617ba13bSMingming Cao * If we _really_ wanted, we could use default values to call ext4_group_add() 1774ac27a0ecSDave Kleikamp * allow the "remount" trick to work for arbitrary resizing, assuming enough 1775ac27a0ecSDave Kleikamp * GDT blocks are reserved to grow to the desired size. 1776ac27a0ecSDave Kleikamp */ 1777617ba13bSMingming Cao int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, 1778617ba13bSMingming Cao ext4_fsblk_t n_blocks_count) 1779ac27a0ecSDave Kleikamp { 1780617ba13bSMingming Cao ext4_fsblk_t o_blocks_count; 1781617ba13bSMingming Cao ext4_grpblk_t last; 1782617ba13bSMingming Cao ext4_grpblk_t add; 1783ac27a0ecSDave Kleikamp struct buffer_head *bh; 1784d89651c8SYongqiang Yang int err; 17855f21b0e6SFrederic Bohe ext4_group_t group; 1786ac27a0ecSDave Kleikamp 1787bd81d8eeSLaurent Vivier o_blocks_count = ext4_blocks_count(es); 1788ac27a0ecSDave Kleikamp 1789ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 179092b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, 179192b97816STheodore Ts'o "extending last group from %llu to %llu blocks", 1792ac27a0ecSDave Kleikamp o_blocks_count, n_blocks_count); 1793ac27a0ecSDave Kleikamp 1794ac27a0ecSDave Kleikamp if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) 1795ac27a0ecSDave Kleikamp return 0; 1796ac27a0ecSDave Kleikamp 1797ac27a0ecSDave Kleikamp if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 179892b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, 179992b97816STheodore Ts'o "filesystem too large to resize to %llu blocks safely", 180092b97816STheodore Ts'o n_blocks_count); 1801ac27a0ecSDave Kleikamp return -EINVAL; 1802ac27a0ecSDave Kleikamp } 1803ac27a0ecSDave Kleikamp 1804ac27a0ecSDave Kleikamp if (n_blocks_count < o_blocks_count) { 180512062dddSEric Sandeen ext4_warning(sb, "can't shrink FS - resize aborted"); 18068f82f840SYongqiang Yang return -EINVAL; 1807ac27a0ecSDave Kleikamp } 1808ac27a0ecSDave Kleikamp 1809ac27a0ecSDave Kleikamp /* Handle the remaining blocks in the last group only. */ 18105f21b0e6SFrederic Bohe ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 1811ac27a0ecSDave Kleikamp 1812ac27a0ecSDave Kleikamp if (last == 0) { 181312062dddSEric Sandeen ext4_warning(sb, "need to use ext2online to resize further"); 1814ac27a0ecSDave Kleikamp return -EPERM; 1815ac27a0ecSDave Kleikamp } 1816ac27a0ecSDave Kleikamp 1817617ba13bSMingming Cao add = EXT4_BLOCKS_PER_GROUP(sb) - last; 1818ac27a0ecSDave Kleikamp 1819ac27a0ecSDave Kleikamp if (o_blocks_count + add < o_blocks_count) { 182012062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1821ac27a0ecSDave Kleikamp return -EINVAL; 1822ac27a0ecSDave Kleikamp } 1823ac27a0ecSDave Kleikamp 1824ac27a0ecSDave Kleikamp if (o_blocks_count + add > n_blocks_count) 1825ac27a0ecSDave Kleikamp add = n_blocks_count - o_blocks_count; 1826ac27a0ecSDave Kleikamp 1827ac27a0ecSDave Kleikamp if (o_blocks_count + add < n_blocks_count) 182812062dddSEric Sandeen ext4_warning(sb, "will only finish group (%llu blocks, %u new)", 1829ac27a0ecSDave Kleikamp o_blocks_count + add, add); 1830ac27a0ecSDave Kleikamp 1831ac27a0ecSDave Kleikamp /* See if the device is actually as big as what was requested */ 18320a846f49Szhangyi (F) bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); 18330a846f49Szhangyi (F) if (IS_ERR(bh)) { 183412062dddSEric Sandeen ext4_warning(sb, "can't read last block, resize aborted"); 1835ac27a0ecSDave Kleikamp return -ENOSPC; 1836ac27a0ecSDave Kleikamp } 1837ac27a0ecSDave Kleikamp brelse(bh); 1838ac27a0ecSDave Kleikamp 1839d89651c8SYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 1840ac27a0ecSDave Kleikamp return err; 1841617ba13bSMingming Cao } /* ext4_group_extend */ 184219c5246dSYongqiang Yang 18431c6bd717STheodore Ts'o 18441c6bd717STheodore Ts'o static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) 18451c6bd717STheodore Ts'o { 18461c6bd717STheodore Ts'o return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); 18471c6bd717STheodore Ts'o } 18481c6bd717STheodore Ts'o 18491c6bd717STheodore Ts'o /* 18501c6bd717STheodore Ts'o * Release the resize inode and drop the resize_inode feature if there 18511c6bd717STheodore Ts'o * are no more reserved gdt blocks, and then convert the file system 18521c6bd717STheodore Ts'o * to enable meta_bg 18531c6bd717STheodore Ts'o */ 18541c6bd717STheodore Ts'o static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) 18551c6bd717STheodore Ts'o { 18561c6bd717STheodore Ts'o handle_t *handle; 18571c6bd717STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 18581c6bd717STheodore Ts'o struct ext4_super_block *es = sbi->s_es; 185959e31c15STheodore Ts'o struct ext4_inode_info *ei = EXT4_I(inode); 18601c6bd717STheodore Ts'o ext4_fsblk_t nr; 18611c6bd717STheodore Ts'o int i, ret, err = 0; 18621c6bd717STheodore Ts'o int credits = 1; 18631c6bd717STheodore Ts'o 18641c6bd717STheodore Ts'o ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); 186559e31c15STheodore Ts'o if (inode) { 18661c6bd717STheodore Ts'o if (es->s_reserved_gdt_blocks) { 18671c6bd717STheodore Ts'o ext4_error(sb, "Unexpected non-zero " 18681c6bd717STheodore Ts'o "s_reserved_gdt_blocks"); 18691c6bd717STheodore Ts'o return -EPERM; 18701c6bd717STheodore Ts'o } 18711c6bd717STheodore Ts'o 18721c6bd717STheodore Ts'o /* Do a quick sanity check of the resize inode */ 1873d77147ffSharshads if (inode->i_blocks != 1 << (inode->i_blkbits - 1874d77147ffSharshads (9 - sbi->s_cluster_bits))) 18751c6bd717STheodore Ts'o goto invalid_resize_inode; 18761c6bd717STheodore Ts'o for (i = 0; i < EXT4_N_BLOCKS; i++) { 18771c6bd717STheodore Ts'o if (i == EXT4_DIND_BLOCK) { 18781c6bd717STheodore Ts'o if (ei->i_data[i]) 18791c6bd717STheodore Ts'o continue; 18801c6bd717STheodore Ts'o else 18811c6bd717STheodore Ts'o goto invalid_resize_inode; 18821c6bd717STheodore Ts'o } 18831c6bd717STheodore Ts'o if (ei->i_data[i]) 18841c6bd717STheodore Ts'o goto invalid_resize_inode; 18851c6bd717STheodore Ts'o } 18861c6bd717STheodore Ts'o credits += 3; /* block bitmap, bg descriptor, resize inode */ 18871c6bd717STheodore Ts'o } 18881c6bd717STheodore Ts'o 18899924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); 18901c6bd717STheodore Ts'o if (IS_ERR(handle)) 18911c6bd717STheodore Ts'o return PTR_ERR(handle); 18921c6bd717STheodore Ts'o 18935d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1894*188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1895*188c299eSJan Kara EXT4_JTR_NONE); 18961c6bd717STheodore Ts'o if (err) 18971c6bd717STheodore Ts'o goto errout; 18981c6bd717STheodore Ts'o 189905c2c00fSJan Kara lock_buffer(sbi->s_sbh); 1900e2b911c5SDarrick J. Wong ext4_clear_feature_resize_inode(sb); 1901e2b911c5SDarrick J. Wong ext4_set_feature_meta_bg(sb); 19021c6bd717STheodore Ts'o sbi->s_es->s_first_meta_bg = 19031c6bd717STheodore Ts'o cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); 190405c2c00fSJan Kara ext4_superblock_csum_set(sb); 190505c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 19061c6bd717STheodore Ts'o 1907a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 19081c6bd717STheodore Ts'o if (err) { 19091c6bd717STheodore Ts'o ext4_std_error(sb, err); 19101c6bd717STheodore Ts'o goto errout; 19111c6bd717STheodore Ts'o } 19121c6bd717STheodore Ts'o 19131c6bd717STheodore Ts'o if (inode) { 19141c6bd717STheodore Ts'o nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); 19151c6bd717STheodore Ts'o ext4_free_blocks(handle, inode, NULL, nr, 1, 19161c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 19171c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 19181c6bd717STheodore Ts'o ei->i_data[EXT4_DIND_BLOCK] = 0; 19191c6bd717STheodore Ts'o inode->i_blocks = 0; 19201c6bd717STheodore Ts'o 19211c6bd717STheodore Ts'o err = ext4_mark_inode_dirty(handle, inode); 19221c6bd717STheodore Ts'o if (err) 19231c6bd717STheodore Ts'o ext4_std_error(sb, err); 19241c6bd717STheodore Ts'o } 19251c6bd717STheodore Ts'o 19261c6bd717STheodore Ts'o errout: 19271c6bd717STheodore Ts'o ret = ext4_journal_stop(handle); 19281c6bd717STheodore Ts'o if (!err) 19291c6bd717STheodore Ts'o err = ret; 19301c6bd717STheodore Ts'o return ret; 19311c6bd717STheodore Ts'o 19321c6bd717STheodore Ts'o invalid_resize_inode: 19331c6bd717STheodore Ts'o ext4_error(sb, "corrupted/inconsistent resize inode"); 19341c6bd717STheodore Ts'o return -EINVAL; 19351c6bd717STheodore Ts'o } 19361c6bd717STheodore Ts'o 193719c5246dSYongqiang Yang /* 193819c5246dSYongqiang Yang * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count 193919c5246dSYongqiang Yang * 194019c5246dSYongqiang Yang * @sb: super block of the fs to be resized 194119c5246dSYongqiang Yang * @n_blocks_count: the number of blocks resides in the resized fs 194219c5246dSYongqiang Yang */ 194319c5246dSYongqiang Yang int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 194419c5246dSYongqiang Yang { 194519c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd = NULL; 194619c5246dSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 194719c5246dSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 194819c5246dSYongqiang Yang struct buffer_head *bh; 194901f795f9SYongqiang Yang struct inode *resize_inode = NULL; 195001f795f9SYongqiang Yang ext4_grpblk_t add, offset; 195119c5246dSYongqiang Yang unsigned long n_desc_blocks; 195219c5246dSYongqiang Yang unsigned long o_desc_blocks; 195301f795f9SYongqiang Yang ext4_group_t o_group; 195401f795f9SYongqiang Yang ext4_group_t n_group; 195501f795f9SYongqiang Yang ext4_fsblk_t o_blocks_count; 19561c6bd717STheodore Ts'o ext4_fsblk_t n_blocks_count_retry = 0; 19574da4a56eSTheodore Ts'o unsigned long last_update_time = 0; 1958117fff10STheodore Ts'o int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; 195901f795f9SYongqiang Yang int meta_bg; 196019c5246dSYongqiang Yang 196159e31c15STheodore Ts'o /* See if the device is actually as big as what was requested */ 19620a846f49Szhangyi (F) bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); 19630a846f49Szhangyi (F) if (IS_ERR(bh)) { 196459e31c15STheodore Ts'o ext4_warning(sb, "can't read last block, resize aborted"); 196559e31c15STheodore Ts'o return -ENOSPC; 196659e31c15STheodore Ts'o } 196759e31c15STheodore Ts'o brelse(bh); 196859e31c15STheodore Ts'o 19691c6bd717STheodore Ts'o retry: 197019c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 197119c5246dSYongqiang Yang 197259e31c15STheodore Ts'o ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " 197392b97816STheodore Ts'o "to %llu blocks", o_blocks_count, n_blocks_count); 197419c5246dSYongqiang Yang 197519c5246dSYongqiang Yang if (n_blocks_count < o_blocks_count) { 197619c5246dSYongqiang Yang /* On-line shrinking not supported */ 197719c5246dSYongqiang Yang ext4_warning(sb, "can't shrink FS - resize aborted"); 197819c5246dSYongqiang Yang return -EINVAL; 197919c5246dSYongqiang Yang } 198019c5246dSYongqiang Yang 198119c5246dSYongqiang Yang if (n_blocks_count == o_blocks_count) 198219c5246dSYongqiang Yang /* Nothing need to do */ 198319c5246dSYongqiang Yang return 0; 198419c5246dSYongqiang Yang 1985bd86298eSLukas Czerner n_group = ext4_get_group_number(sb, n_blocks_count - 1); 19864f2f76f7SJan Kara if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { 19873f8a6411STheodore Ts'o ext4_warning(sb, "resize would cause inodes_count overflow"); 19883f8a6411STheodore Ts'o return -EINVAL; 19893f8a6411STheodore Ts'o } 1990a0ade1deSLukas Czerner ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); 199119c5246dSYongqiang Yang 19921c6bd717STheodore Ts'o n_desc_blocks = num_desc_blocks(sb, n_group + 1); 19931c6bd717STheodore Ts'o o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); 199419c5246dSYongqiang Yang 1995e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 199601f795f9SYongqiang Yang 1997e2b911c5SDarrick J. Wong if (ext4_has_feature_resize_inode(sb)) { 199801f795f9SYongqiang Yang if (meta_bg) { 199901f795f9SYongqiang Yang ext4_error(sb, "resize_inode and meta_bg enabled " 200001f795f9SYongqiang Yang "simultaneously"); 200101f795f9SYongqiang Yang return -EINVAL; 200201f795f9SYongqiang Yang } 20031c6bd717STheodore Ts'o if (n_desc_blocks > o_desc_blocks + 20041c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks)) { 20051c6bd717STheodore Ts'o n_blocks_count_retry = n_blocks_count; 20061c6bd717STheodore Ts'o n_desc_blocks = o_desc_blocks + 20071c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks); 20081c6bd717STheodore Ts'o n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); 2009aec51758SJerry Lee n_blocks_count = (ext4_fsblk_t)n_group * 2010f96c3ac8SJan Kara EXT4_BLOCKS_PER_GROUP(sb) + 2011f96c3ac8SJan Kara le32_to_cpu(es->s_first_data_block); 20121c6bd717STheodore Ts'o n_group--; /* set to last group number */ 201319c5246dSYongqiang Yang } 20141c6bd717STheodore Ts'o 20151c6bd717STheodore Ts'o if (!resize_inode) 20168a363970STheodore Ts'o resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, 20178a363970STheodore Ts'o EXT4_IGET_SPECIAL); 201819c5246dSYongqiang Yang if (IS_ERR(resize_inode)) { 201919c5246dSYongqiang Yang ext4_warning(sb, "Error opening resize inode"); 202019c5246dSYongqiang Yang return PTR_ERR(resize_inode); 202119c5246dSYongqiang Yang } 20221c6bd717STheodore Ts'o } 20231c6bd717STheodore Ts'o 202459e31c15STheodore Ts'o if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { 20251c6bd717STheodore Ts'o err = ext4_convert_meta_bg(sb, resize_inode); 20261c6bd717STheodore Ts'o if (err) 20271c6bd717STheodore Ts'o goto out; 20281c6bd717STheodore Ts'o if (resize_inode) { 20291c6bd717STheodore Ts'o iput(resize_inode); 20301c6bd717STheodore Ts'o resize_inode = NULL; 20311c6bd717STheodore Ts'o } 20321c6bd717STheodore Ts'o if (n_blocks_count_retry) { 20331c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 20341c6bd717STheodore Ts'o n_blocks_count_retry = 0; 20351c6bd717STheodore Ts'o goto retry; 20361c6bd717STheodore Ts'o } 203701f795f9SYongqiang Yang } 203819c5246dSYongqiang Yang 2039f0a459deSTheodore Ts'o /* 2040f0a459deSTheodore Ts'o * Make sure the last group has enough space so that it's 2041f0a459deSTheodore Ts'o * guaranteed to have enough space for all metadata blocks 2042f0a459deSTheodore Ts'o * that it might need to hold. (We might not need to store 2043f0a459deSTheodore Ts'o * the inode table blocks in the last block group, but there 2044f0a459deSTheodore Ts'o * will be cases where this might be needed.) 2045f0a459deSTheodore Ts'o */ 2046f0a459deSTheodore Ts'o if ((ext4_group_first_block_no(sb, n_group) + 2047f0a459deSTheodore Ts'o ext4_group_overhead_blocks(sb, n_group) + 2 + 2048f0a459deSTheodore Ts'o sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { 2049f0a459deSTheodore Ts'o n_blocks_count = ext4_group_first_block_no(sb, n_group); 2050f0a459deSTheodore Ts'o n_group--; 2051f0a459deSTheodore Ts'o n_blocks_count_retry = 0; 2052f0a459deSTheodore Ts'o if (resize_inode) { 2053f0a459deSTheodore Ts'o iput(resize_inode); 2054f0a459deSTheodore Ts'o resize_inode = NULL; 2055f0a459deSTheodore Ts'o } 2056f0a459deSTheodore Ts'o goto retry; 2057f0a459deSTheodore Ts'o } 2058f0a459deSTheodore Ts'o 205919c5246dSYongqiang Yang /* extend the last group */ 2060a0ade1deSLukas Czerner if (n_group == o_group) 2061a0ade1deSLukas Czerner add = n_blocks_count - o_blocks_count; 2062a0ade1deSLukas Czerner else 2063d77147ffSharshads add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); 2064a0ade1deSLukas Czerner if (add > 0) { 206519c5246dSYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 206619c5246dSYongqiang Yang if (err) 206719c5246dSYongqiang Yang goto out; 206819c5246dSYongqiang Yang } 206919c5246dSYongqiang Yang 2070d7574ad0SYongqiang Yang if (ext4_blocks_count(es) == n_blocks_count) 207119c5246dSYongqiang Yang goto out; 207219c5246dSYongqiang Yang 2073117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, n_group + 1); 2074117fff10STheodore Ts'o if (err) 2075f348e224SVasily Averin goto out; 2076117fff10STheodore Ts'o 207728623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, n_group + 1); 207828623c2fSTheodore Ts'o if (err) 207928623c2fSTheodore Ts'o goto out; 208028623c2fSTheodore Ts'o 208119c5246dSYongqiang Yang flex_gd = alloc_flex_gd(flexbg_size); 208219c5246dSYongqiang Yang if (flex_gd == NULL) { 208319c5246dSYongqiang Yang err = -ENOMEM; 208419c5246dSYongqiang Yang goto out; 208519c5246dSYongqiang Yang } 208619c5246dSYongqiang Yang 208719c5246dSYongqiang Yang /* Add flex groups. Note that a regular group is a 208819c5246dSYongqiang Yang * flex group with 1 group. 208919c5246dSYongqiang Yang */ 209019c5246dSYongqiang Yang while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, 209119c5246dSYongqiang Yang flexbg_size)) { 20924da4a56eSTheodore Ts'o if (jiffies - last_update_time > HZ * 10) { 20934da4a56eSTheodore Ts'o if (last_update_time) 20944da4a56eSTheodore Ts'o ext4_msg(sb, KERN_INFO, 20954da4a56eSTheodore Ts'o "resized to %llu blocks", 20964da4a56eSTheodore Ts'o ext4_blocks_count(es)); 20974da4a56eSTheodore Ts'o last_update_time = jiffies; 20984da4a56eSTheodore Ts'o } 209903c1c290SYongqiang Yang if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) 210003c1c290SYongqiang Yang break; 210119c5246dSYongqiang Yang err = ext4_flex_group_add(sb, resize_inode, flex_gd); 210219c5246dSYongqiang Yang if (unlikely(err)) 210319c5246dSYongqiang Yang break; 210419c5246dSYongqiang Yang } 210519c5246dSYongqiang Yang 21061c6bd717STheodore Ts'o if (!err && n_blocks_count_retry) { 21071c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 21081c6bd717STheodore Ts'o n_blocks_count_retry = 0; 21091c6bd717STheodore Ts'o free_flex_gd(flex_gd); 21101c6bd717STheodore Ts'o flex_gd = NULL; 2111db6aee62SVasily Averin if (resize_inode) { 2112db6aee62SVasily Averin iput(resize_inode); 2113db6aee62SVasily Averin resize_inode = NULL; 2114db6aee62SVasily Averin } 21151c6bd717STheodore Ts'o goto retry; 21161c6bd717STheodore Ts'o } 21171c6bd717STheodore Ts'o 211819c5246dSYongqiang Yang out: 211919c5246dSYongqiang Yang if (flex_gd) 212019c5246dSYongqiang Yang free_flex_gd(flex_gd); 212101f795f9SYongqiang Yang if (resize_inode != NULL) 212219c5246dSYongqiang Yang iput(resize_inode); 21236c732840SLukas Czerner if (err) 21246c732840SLukas Czerner ext4_warning(sb, "error (%d) occurred during " 21256c732840SLukas Czerner "file system resize", err); 21266c732840SLukas Czerner ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", 21276c732840SLukas Czerner ext4_blocks_count(es)); 212819c5246dSYongqiang Yang return err; 212919c5246dSYongqiang Yang } 2130