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"); 412188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); 413188c299eSJan 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"); 478188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, bh, 479188c299eSJan 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"); 574188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb, 575188c299eSJan 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 */ 720*bbc605cdSLukas Czerner unsigned int ext4_list_backups(struct super_block *sb, unsigned int *three, 721*bbc605cdSLukas Czerner unsigned int *five, unsigned int *seven) 722ac27a0ecSDave Kleikamp { 723*bbc605cdSLukas Czerner struct ext4_super_block *es = EXT4_SB(sb)->s_es; 724*bbc605cdSLukas Czerner unsigned int *min = three; 725ac27a0ecSDave Kleikamp int mult = 3; 726*bbc605cdSLukas Czerner unsigned int ret; 727*bbc605cdSLukas Czerner 728*bbc605cdSLukas Czerner if (ext4_has_feature_sparse_super2(sb)) { 729*bbc605cdSLukas Czerner do { 730*bbc605cdSLukas Czerner if (*min > 2) 731*bbc605cdSLukas Czerner return UINT_MAX; 732*bbc605cdSLukas Czerner ret = le32_to_cpu(es->s_backup_bgs[*min - 1]); 733*bbc605cdSLukas Czerner *min += 1; 734*bbc605cdSLukas Czerner } while (!ret); 735*bbc605cdSLukas Czerner return ret; 736*bbc605cdSLukas Czerner } 737ac27a0ecSDave Kleikamp 738e2b911c5SDarrick J. Wong if (!ext4_has_feature_sparse_super(sb)) { 739ac27a0ecSDave Kleikamp ret = *min; 740ac27a0ecSDave Kleikamp *min += 1; 741ac27a0ecSDave Kleikamp return ret; 742ac27a0ecSDave Kleikamp } 743ac27a0ecSDave Kleikamp 744ac27a0ecSDave Kleikamp if (*five < *min) { 745ac27a0ecSDave Kleikamp min = five; 746ac27a0ecSDave Kleikamp mult = 5; 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp if (*seven < *min) { 749ac27a0ecSDave Kleikamp min = seven; 750ac27a0ecSDave Kleikamp mult = 7; 751ac27a0ecSDave Kleikamp } 752ac27a0ecSDave Kleikamp 753ac27a0ecSDave Kleikamp ret = *min; 754ac27a0ecSDave Kleikamp *min *= mult; 755ac27a0ecSDave Kleikamp 756ac27a0ecSDave Kleikamp return ret; 757ac27a0ecSDave Kleikamp } 758ac27a0ecSDave Kleikamp 759ac27a0ecSDave Kleikamp /* 760ac27a0ecSDave Kleikamp * Check that all of the backup GDT blocks are held in the primary GDT block. 761ac27a0ecSDave Kleikamp * It is assumed that they are stored in group order. Returns the number of 762ac27a0ecSDave Kleikamp * groups in current filesystem that have BACKUPS, or -ve error code. 763ac27a0ecSDave Kleikamp */ 764ac27a0ecSDave Kleikamp static int verify_reserved_gdb(struct super_block *sb, 765c72df9f9SYongqiang Yang ext4_group_t end, 766ac27a0ecSDave Kleikamp struct buffer_head *primary) 767ac27a0ecSDave Kleikamp { 768617ba13bSMingming Cao const ext4_fsblk_t blk = primary->b_blocknr; 769ac27a0ecSDave Kleikamp unsigned three = 1; 770ac27a0ecSDave Kleikamp unsigned five = 5; 771ac27a0ecSDave Kleikamp unsigned seven = 7; 772ac27a0ecSDave Kleikamp unsigned grp; 773ac27a0ecSDave Kleikamp __le32 *p = (__le32 *)primary->b_data; 774ac27a0ecSDave Kleikamp int gdbackups = 0; 775ac27a0ecSDave Kleikamp 776617ba13bSMingming Cao while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { 777bd81d8eeSLaurent Vivier if (le32_to_cpu(*p++) != 778bd81d8eeSLaurent Vivier grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ 77912062dddSEric Sandeen ext4_warning(sb, "reserved GDT %llu" 7802ae02107SMingming Cao " missing grp %d (%llu)", 781ac27a0ecSDave Kleikamp blk, grp, 782bd81d8eeSLaurent Vivier grp * 783bd81d8eeSLaurent Vivier (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 784bd81d8eeSLaurent Vivier blk); 785ac27a0ecSDave Kleikamp return -EINVAL; 786ac27a0ecSDave Kleikamp } 787617ba13bSMingming Cao if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) 788ac27a0ecSDave Kleikamp return -EFBIG; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp 791ac27a0ecSDave Kleikamp return gdbackups; 792ac27a0ecSDave Kleikamp } 793ac27a0ecSDave Kleikamp 794ac27a0ecSDave Kleikamp /* 795ac27a0ecSDave Kleikamp * Called when we need to bring a reserved group descriptor table block into 796ac27a0ecSDave Kleikamp * use from the resize inode. The primary copy of the new GDT block currently 797ac27a0ecSDave Kleikamp * is an indirect block (under the double indirect block in the resize inode). 798ac27a0ecSDave Kleikamp * The new backup GDT blocks will be stored as leaf blocks in this indirect 799ac27a0ecSDave Kleikamp * block, in group order. Even though we know all the block numbers we need, 800ac27a0ecSDave Kleikamp * we check to ensure that the resize inode has actually reserved these blocks. 801ac27a0ecSDave Kleikamp * 802ac27a0ecSDave Kleikamp * Don't need to update the block bitmaps because the blocks are still in use. 803ac27a0ecSDave Kleikamp * 804ac27a0ecSDave Kleikamp * We get all of the error cases out of the way, so that we are sure to not 805ac27a0ecSDave Kleikamp * fail once we start modifying the data on disk, because JBD has no rollback. 806ac27a0ecSDave Kleikamp */ 807ac27a0ecSDave Kleikamp static int add_new_gdb(handle_t *handle, struct inode *inode, 8082f919710SYongqiang Yang ext4_group_t group) 809ac27a0ecSDave Kleikamp { 810ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 811617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 8122f919710SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 813617ba13bSMingming Cao ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; 814fb265c9cSTheodore Ts'o struct buffer_head **o_group_desc, **n_group_desc = NULL; 815fb265c9cSTheodore Ts'o struct buffer_head *dind = NULL; 816fb265c9cSTheodore Ts'o struct buffer_head *gdb_bh = NULL; 817ac27a0ecSDave Kleikamp int gdbackups; 818fb265c9cSTheodore Ts'o struct ext4_iloc iloc = { .bh = NULL }; 819ac27a0ecSDave Kleikamp __le32 *data; 820ac27a0ecSDave Kleikamp int err; 821ac27a0ecSDave Kleikamp 822ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 823ac27a0ecSDave Kleikamp printk(KERN_DEBUG 824617ba13bSMingming Cao "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", 825ac27a0ecSDave Kleikamp gdb_num); 826ac27a0ecSDave Kleikamp 827fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 828fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 829fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 830ac27a0ecSDave Kleikamp 831c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, gdb_bh); 8322f919710SYongqiang Yang if (gdbackups < 0) { 833ac27a0ecSDave Kleikamp err = gdbackups; 834fb265c9cSTheodore Ts'o goto errout; 835ac27a0ecSDave Kleikamp } 836ac27a0ecSDave Kleikamp 837617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 838fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 839fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 840fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 841fb265c9cSTheodore Ts'o dind = NULL; 842fb265c9cSTheodore Ts'o goto errout; 843ac27a0ecSDave Kleikamp } 844ac27a0ecSDave Kleikamp 845ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 846617ba13bSMingming Cao if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { 84712062dddSEric Sandeen ext4_warning(sb, "new group %u GDT block %llu not reserved", 8482f919710SYongqiang Yang group, gdblock); 849ac27a0ecSDave Kleikamp err = -EINVAL; 850fb265c9cSTheodore Ts'o goto errout; 851ac27a0ecSDave Kleikamp } 852ac27a0ecSDave Kleikamp 8535d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 854188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 855188c299eSJan Kara EXT4_JTR_NONE); 856b4097142STheodore Ts'o if (unlikely(err)) 857fb265c9cSTheodore Ts'o goto errout; 858ac27a0ecSDave Kleikamp 8595d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 860188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 861b4097142STheodore Ts'o if (unlikely(err)) 862fb265c9cSTheodore Ts'o goto errout; 863ac27a0ecSDave Kleikamp 8645d601255Sliang xie BUFFER_TRACE(dind, "get_write_access"); 865188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, dind, EXT4_JTR_NONE); 866c9e87161SDinghao Liu if (unlikely(err)) { 867b4097142STheodore Ts'o ext4_std_error(sb, err); 868c9e87161SDinghao Liu goto errout; 869c9e87161SDinghao Liu } 870ac27a0ecSDave Kleikamp 871617ba13bSMingming Cao /* ext4_reserve_inode_write() gets a reference on the iloc */ 872b4097142STheodore Ts'o err = ext4_reserve_inode_write(handle, inode, &iloc); 873b4097142STheodore Ts'o if (unlikely(err)) 874fb265c9cSTheodore Ts'o goto errout; 875ac27a0ecSDave Kleikamp 87671b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 87771b565ceSTheodore Ts'o GFP_KERNEL); 878ac27a0ecSDave Kleikamp if (!n_group_desc) { 879ac27a0ecSDave Kleikamp err = -ENOMEM; 880f18a5f21STheodore Ts'o ext4_warning(sb, "not enough memory for %lu groups", 881f18a5f21STheodore Ts'o gdb_num + 1); 882fb265c9cSTheodore Ts'o goto errout; 883ac27a0ecSDave Kleikamp } 884ac27a0ecSDave Kleikamp 885ac27a0ecSDave Kleikamp /* 886ac27a0ecSDave Kleikamp * Finally, we have all of the possible failures behind us... 887ac27a0ecSDave Kleikamp * 888ac27a0ecSDave Kleikamp * Remove new GDT block from inode double-indirect block and clear out 889ac27a0ecSDave Kleikamp * the new GDT block for use (which also "frees" the backup GDT blocks 890ac27a0ecSDave Kleikamp * from the reserved inode). We don't need to change the bitmaps for 891ac27a0ecSDave Kleikamp * these blocks, because they are marked as in-use from being in the 892ac27a0ecSDave Kleikamp * reserved inode, and will become GDT blocks (primary and backup). 893ac27a0ecSDave Kleikamp */ 894617ba13bSMingming Cao data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; 895b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, dind); 896b4097142STheodore Ts'o if (unlikely(err)) { 897b4097142STheodore Ts'o ext4_std_error(sb, err); 898fb265c9cSTheodore Ts'o goto errout; 899b4097142STheodore Ts'o } 900d77147ffSharshads inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 901d77147ffSharshads (9 - EXT4_SB(sb)->s_cluster_bits); 902617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 9032f919710SYongqiang Yang memset(gdb_bh->b_data, 0, sb->s_blocksize); 9042f919710SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 905b4097142STheodore Ts'o if (unlikely(err)) { 906b4097142STheodore Ts'o ext4_std_error(sb, err); 9078c380ab4SPan Bian iloc.bh = NULL; 908fb265c9cSTheodore Ts'o goto errout; 909b4097142STheodore Ts'o } 910b4097142STheodore Ts'o brelse(dind); 911ac27a0ecSDave Kleikamp 9121d0c3924STheodore Ts'o rcu_read_lock(); 9131d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 914ac27a0ecSDave Kleikamp memcpy(n_group_desc, o_group_desc, 915617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9161d0c3924STheodore Ts'o rcu_read_unlock(); 9172f919710SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 9181d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 919617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count++; 9201d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 921ac27a0ecSDave Kleikamp 92205c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 923e8546d06SMarcin Slusarz le16_add_cpu(&es->s_reserved_gdt_blocks, -1); 92405c2c00fSJan Kara ext4_superblock_csum_set(sb); 92505c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 926a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 927b4097142STheodore Ts'o if (err) 928b4097142STheodore Ts'o ext4_std_error(sb, err); 929b4097142STheodore Ts'o return err; 930fb265c9cSTheodore Ts'o errout: 931b93b41d4SAl Viro kvfree(n_group_desc); 932ac27a0ecSDave Kleikamp brelse(iloc.bh); 933ac27a0ecSDave Kleikamp brelse(dind); 9342f919710SYongqiang Yang brelse(gdb_bh); 935ac27a0ecSDave Kleikamp 936617ba13bSMingming Cao ext4_debug("leaving with error %d\n", err); 937ac27a0ecSDave Kleikamp return err; 938ac27a0ecSDave Kleikamp } 939ac27a0ecSDave Kleikamp 940ac27a0ecSDave Kleikamp /* 94101f795f9SYongqiang Yang * add_new_gdb_meta_bg is the sister of add_new_gdb. 94201f795f9SYongqiang Yang */ 94301f795f9SYongqiang Yang static int add_new_gdb_meta_bg(struct super_block *sb, 94401f795f9SYongqiang Yang handle_t *handle, ext4_group_t group) { 94501f795f9SYongqiang Yang ext4_fsblk_t gdblock; 94601f795f9SYongqiang Yang struct buffer_head *gdb_bh; 94701f795f9SYongqiang Yang struct buffer_head **o_group_desc, **n_group_desc; 94801f795f9SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 94901f795f9SYongqiang Yang int err; 95001f795f9SYongqiang Yang 95101f795f9SYongqiang Yang gdblock = ext4_meta_bg_first_block_no(sb, group) + 95201f795f9SYongqiang Yang ext4_bg_has_super(sb, group); 953fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 954fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 955fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 95671b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 95771b565ceSTheodore Ts'o GFP_KERNEL); 95801f795f9SYongqiang Yang if (!n_group_desc) { 95961a9c11eSVasily Averin brelse(gdb_bh); 96001f795f9SYongqiang Yang err = -ENOMEM; 96101f795f9SYongqiang Yang ext4_warning(sb, "not enough memory for %lu groups", 96201f795f9SYongqiang Yang gdb_num + 1); 96301f795f9SYongqiang Yang return err; 96401f795f9SYongqiang Yang } 96501f795f9SYongqiang Yang 9661d0c3924STheodore Ts'o rcu_read_lock(); 9671d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 96801f795f9SYongqiang Yang memcpy(n_group_desc, o_group_desc, 96901f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9701d0c3924STheodore Ts'o rcu_read_unlock(); 97101f795f9SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 972d64264d6SLukas Czerner 973d64264d6SLukas Czerner BUFFER_TRACE(gdb_bh, "get_write_access"); 974188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE); 975d64264d6SLukas Czerner if (err) { 976d64264d6SLukas Czerner kvfree(n_group_desc); 977d64264d6SLukas Czerner brelse(gdb_bh); 978d64264d6SLukas Czerner return err; 979d64264d6SLukas Czerner } 980d64264d6SLukas Czerner 9811d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 98201f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count++; 9831d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 98401f795f9SYongqiang Yang return err; 98501f795f9SYongqiang Yang } 98601f795f9SYongqiang Yang 98701f795f9SYongqiang Yang /* 988ac27a0ecSDave Kleikamp * Called when we are adding a new group which has a backup copy of each of 989ac27a0ecSDave Kleikamp * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. 990ac27a0ecSDave Kleikamp * We need to add these reserved backup GDT blocks to the resize inode, so 991ac27a0ecSDave Kleikamp * that they are kept for future resizing and not allocated to files. 992ac27a0ecSDave Kleikamp * 993ac27a0ecSDave Kleikamp * Each reserved backup GDT block will go into a different indirect block. 994ac27a0ecSDave Kleikamp * The indirect blocks are actually the primary reserved GDT blocks, 995ac27a0ecSDave Kleikamp * so we know in advance what their block numbers are. We only get the 996ac27a0ecSDave Kleikamp * double-indirect block to verify it is pointing to the primary reserved 997ac27a0ecSDave Kleikamp * GDT blocks so we don't overwrite a data block by accident. The reserved 998ac27a0ecSDave Kleikamp * backup GDT blocks are stored in their reserved primary GDT block. 999ac27a0ecSDave Kleikamp */ 1000ac27a0ecSDave Kleikamp static int reserve_backup_gdb(handle_t *handle, struct inode *inode, 1001668f4dc5SYongqiang Yang ext4_group_t group) 1002ac27a0ecSDave Kleikamp { 1003ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1004617ba13bSMingming Cao int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 1005d77147ffSharshads int cluster_bits = EXT4_SB(sb)->s_cluster_bits; 1006ac27a0ecSDave Kleikamp struct buffer_head **primary; 1007ac27a0ecSDave Kleikamp struct buffer_head *dind; 1008617ba13bSMingming Cao struct ext4_iloc iloc; 1009617ba13bSMingming Cao ext4_fsblk_t blk; 1010ac27a0ecSDave Kleikamp __le32 *data, *end; 1011ac27a0ecSDave Kleikamp int gdbackups = 0; 1012ac27a0ecSDave Kleikamp int res, i; 1013ac27a0ecSDave Kleikamp int err; 1014ac27a0ecSDave Kleikamp 10156da2ec56SKees Cook primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); 1016ac27a0ecSDave Kleikamp if (!primary) 1017ac27a0ecSDave Kleikamp return -ENOMEM; 1018ac27a0ecSDave Kleikamp 1019617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 1020fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 1021fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 1022fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 1023fb265c9cSTheodore Ts'o dind = NULL; 1024ac27a0ecSDave Kleikamp goto exit_free; 1025ac27a0ecSDave Kleikamp } 1026ac27a0ecSDave Kleikamp 1027617ba13bSMingming Cao blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; 102894460093SJosef Bacik data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % 102994460093SJosef Bacik EXT4_ADDR_PER_BLOCK(sb)); 1030617ba13bSMingming Cao end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); 1031ac27a0ecSDave Kleikamp 1032ac27a0ecSDave Kleikamp /* Get each reserved primary GDT block and verify it holds backups */ 1033ac27a0ecSDave Kleikamp for (res = 0; res < reserved_gdb; res++, blk++) { 1034ac27a0ecSDave Kleikamp if (le32_to_cpu(*data) != blk) { 103512062dddSEric Sandeen ext4_warning(sb, "reserved block %llu" 1036ac27a0ecSDave Kleikamp " not at offset %ld", 1037ac27a0ecSDave Kleikamp blk, 1038ac27a0ecSDave Kleikamp (long)(data - (__le32 *)dind->b_data)); 1039ac27a0ecSDave Kleikamp err = -EINVAL; 1040ac27a0ecSDave Kleikamp goto exit_bh; 1041ac27a0ecSDave Kleikamp } 1042fb265c9cSTheodore Ts'o primary[res] = ext4_sb_bread(sb, blk, 0); 1043fb265c9cSTheodore Ts'o if (IS_ERR(primary[res])) { 1044fb265c9cSTheodore Ts'o err = PTR_ERR(primary[res]); 1045fb265c9cSTheodore Ts'o primary[res] = NULL; 1046ac27a0ecSDave Kleikamp goto exit_bh; 1047ac27a0ecSDave Kleikamp } 1048c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, primary[res]); 1049c72df9f9SYongqiang Yang if (gdbackups < 0) { 1050ac27a0ecSDave Kleikamp brelse(primary[res]); 1051ac27a0ecSDave Kleikamp err = gdbackups; 1052ac27a0ecSDave Kleikamp goto exit_bh; 1053ac27a0ecSDave Kleikamp } 1054ac27a0ecSDave Kleikamp if (++data >= end) 1055ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 1056ac27a0ecSDave Kleikamp } 1057ac27a0ecSDave Kleikamp 1058ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 10595d601255Sliang xie BUFFER_TRACE(primary[i], "get_write_access"); 1060188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, primary[i], 1061188c299eSJan Kara EXT4_JTR_NONE))) 1062ac27a0ecSDave Kleikamp goto exit_bh; 1063ac27a0ecSDave Kleikamp } 1064ac27a0ecSDave Kleikamp 1065617ba13bSMingming Cao if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) 1066ac27a0ecSDave Kleikamp goto exit_bh; 1067ac27a0ecSDave Kleikamp 1068ac27a0ecSDave Kleikamp /* 1069ac27a0ecSDave Kleikamp * Finally we can add each of the reserved backup GDT blocks from 1070ac27a0ecSDave Kleikamp * the new group to its reserved primary GDT block. 1071ac27a0ecSDave Kleikamp */ 1072668f4dc5SYongqiang Yang blk = group * EXT4_BLOCKS_PER_GROUP(sb); 1073ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 1074ac27a0ecSDave Kleikamp int err2; 1075ac27a0ecSDave Kleikamp data = (__le32 *)primary[i]->b_data; 1076ac27a0ecSDave Kleikamp /* printk("reserving backup %lu[%u] = %lu\n", 1077ac27a0ecSDave Kleikamp primary[i]->b_blocknr, gdbackups, 1078ac27a0ecSDave Kleikamp blk + primary[i]->b_blocknr); */ 1079ac27a0ecSDave Kleikamp data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); 10800390131bSFrank Mayhar err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); 1081ac27a0ecSDave Kleikamp if (!err) 1082ac27a0ecSDave Kleikamp err = err2; 1083ac27a0ecSDave Kleikamp } 1084d77147ffSharshads 1085d77147ffSharshads inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); 1086617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 1087ac27a0ecSDave Kleikamp 1088ac27a0ecSDave Kleikamp exit_bh: 1089ac27a0ecSDave Kleikamp while (--res >= 0) 1090ac27a0ecSDave Kleikamp brelse(primary[res]); 1091ac27a0ecSDave Kleikamp brelse(dind); 1092ac27a0ecSDave Kleikamp 1093ac27a0ecSDave Kleikamp exit_free: 1094ac27a0ecSDave Kleikamp kfree(primary); 1095ac27a0ecSDave Kleikamp 1096ac27a0ecSDave Kleikamp return err; 1097ac27a0ecSDave Kleikamp } 1098ac27a0ecSDave Kleikamp 1099ac27a0ecSDave Kleikamp /* 1100617ba13bSMingming Cao * Update the backup copies of the ext4 metadata. These don't need to be part 1101ac27a0ecSDave Kleikamp * of the main resize transaction, because e2fsck will re-write them if there 1102ac27a0ecSDave Kleikamp * is a problem (basically only OOM will cause a problem). However, we 1103ac27a0ecSDave Kleikamp * _should_ update the backups if possible, in case the primary gets trashed 1104ac27a0ecSDave Kleikamp * for some reason and we need to run e2fsck from a backup superblock. The 1105ac27a0ecSDave Kleikamp * important part is that the new block and inode counts are in the backup 1106ac27a0ecSDave Kleikamp * superblocks, and the location of the new group metadata in the GDT backups. 1107ac27a0ecSDave Kleikamp * 110832ed5058STheodore Ts'o * We do not need take the s_resize_lock for this, because these 110932ed5058STheodore Ts'o * blocks are not otherwise touched by the filesystem code when it is 111032ed5058STheodore Ts'o * mounted. We don't need to worry about last changing from 111132ed5058STheodore Ts'o * sbi->s_groups_count, because the worst that can happen is that we 111232ed5058STheodore Ts'o * do not copy the full number of backups at this time. The resize 111332ed5058STheodore Ts'o * which changed s_groups_count will backup again. 1114ac27a0ecSDave Kleikamp */ 1115904dad47SAndy Leiserson static void update_backups(struct super_block *sb, sector_t blk_off, char *data, 111601f795f9SYongqiang Yang int size, int meta_bg) 1117ac27a0ecSDave Kleikamp { 1118617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 111901f795f9SYongqiang Yang ext4_group_t last; 1120617ba13bSMingming Cao const int bpg = EXT4_BLOCKS_PER_GROUP(sb); 1121ac27a0ecSDave Kleikamp unsigned three = 1; 1122ac27a0ecSDave Kleikamp unsigned five = 5; 1123ac27a0ecSDave Kleikamp unsigned seven = 7; 112401f795f9SYongqiang Yang ext4_group_t group = 0; 1125ac27a0ecSDave Kleikamp int rest = sb->s_blocksize - size; 1126ac27a0ecSDave Kleikamp handle_t *handle; 1127ac27a0ecSDave Kleikamp int err = 0, err2; 1128ac27a0ecSDave Kleikamp 11299924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 1130ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1131ac27a0ecSDave Kleikamp group = 1; 1132ac27a0ecSDave Kleikamp err = PTR_ERR(handle); 1133ac27a0ecSDave Kleikamp goto exit_err; 1134ac27a0ecSDave Kleikamp } 1135ac27a0ecSDave Kleikamp 113601f795f9SYongqiang Yang if (meta_bg == 0) { 113701f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 113801f795f9SYongqiang Yang last = sbi->s_groups_count; 113901f795f9SYongqiang Yang } else { 1140904dad47SAndy Leiserson group = ext4_get_group_number(sb, blk_off) + 1; 114101f795f9SYongqiang Yang last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); 114201f795f9SYongqiang Yang } 114301f795f9SYongqiang Yang 114401f795f9SYongqiang Yang while (group < sbi->s_groups_count) { 1145ac27a0ecSDave Kleikamp struct buffer_head *bh; 114601f795f9SYongqiang Yang ext4_fsblk_t backup_block; 1147ac27a0ecSDave Kleikamp 1148ac27a0ecSDave Kleikamp /* Out of journal space, and can't get more - abort - so sad */ 114983448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 1150a4130367SJan Kara if (err < 0) 1151ac27a0ecSDave Kleikamp break; 1152ac27a0ecSDave Kleikamp 115301f795f9SYongqiang Yang if (meta_bg == 0) 11549378c676SJan Kara backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; 115501f795f9SYongqiang Yang else 115601f795f9SYongqiang Yang backup_block = (ext4_group_first_block_no(sb, group) + 115701f795f9SYongqiang Yang ext4_bg_has_super(sb, group)); 115801f795f9SYongqiang Yang 115901f795f9SYongqiang Yang bh = sb_getblk(sb, backup_block); 1160aebf0243SWang Shilong if (unlikely(!bh)) { 1161860d21e2STheodore Ts'o err = -ENOMEM; 1162ac27a0ecSDave Kleikamp break; 1163ac27a0ecSDave Kleikamp } 116401f795f9SYongqiang Yang ext4_debug("update metadata backup %llu(+%llu)\n", 116501f795f9SYongqiang Yang backup_block, backup_block - 116601f795f9SYongqiang Yang ext4_group_first_block_no(sb, group)); 11675d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1168188c299eSJan Kara if ((err = ext4_journal_get_write_access(handle, sb, bh, 1169188c299eSJan Kara EXT4_JTR_NONE))) 1170ac27a0ecSDave Kleikamp break; 1171ac27a0ecSDave Kleikamp lock_buffer(bh); 1172ac27a0ecSDave Kleikamp memcpy(bh->b_data, data, size); 1173ac27a0ecSDave Kleikamp if (rest) 1174ac27a0ecSDave Kleikamp memset(bh->b_data + size, 0, rest); 1175ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 1176ac27a0ecSDave Kleikamp unlock_buffer(bh); 1177b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, bh); 1178b4097142STheodore Ts'o if (unlikely(err)) 1179b4097142STheodore Ts'o ext4_std_error(sb, err); 1180ac27a0ecSDave Kleikamp brelse(bh); 118101f795f9SYongqiang Yang 118201f795f9SYongqiang Yang if (meta_bg == 0) 118301f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 118401f795f9SYongqiang Yang else if (group == last) 118501f795f9SYongqiang Yang break; 118601f795f9SYongqiang Yang else 118701f795f9SYongqiang Yang group = last; 1188ac27a0ecSDave Kleikamp } 1189617ba13bSMingming Cao if ((err2 = ext4_journal_stop(handle)) && !err) 1190ac27a0ecSDave Kleikamp err = err2; 1191ac27a0ecSDave Kleikamp 1192ac27a0ecSDave Kleikamp /* 1193ac27a0ecSDave Kleikamp * Ugh! Need to have e2fsck write the backup copies. It is too 1194ac27a0ecSDave Kleikamp * late to revert the resize, we shouldn't fail just because of 1195ac27a0ecSDave Kleikamp * the backup copies (they are only needed in case of corruption). 1196ac27a0ecSDave Kleikamp * 1197ac27a0ecSDave Kleikamp * However, if we got here we have a journal problem too, so we 1198ac27a0ecSDave Kleikamp * can't really start a transaction to mark the superblock. 1199ac27a0ecSDave Kleikamp * Chicken out and just set the flag on the hope it will be written 1200ac27a0ecSDave Kleikamp * to disk, and if not - we will simply wait until next fsck. 1201ac27a0ecSDave Kleikamp */ 1202ac27a0ecSDave Kleikamp exit_err: 1203ac27a0ecSDave Kleikamp if (err) { 120412062dddSEric Sandeen ext4_warning(sb, "can't update backup for group %u (err %d), " 1205ac27a0ecSDave Kleikamp "forcing fsck on next reboot", group, err); 1206617ba13bSMingming Cao sbi->s_mount_state &= ~EXT4_VALID_FS; 1207617ba13bSMingming Cao sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1208ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 1209ac27a0ecSDave Kleikamp } 1210ac27a0ecSDave Kleikamp } 1211ac27a0ecSDave Kleikamp 1212bb08c1e7SYongqiang Yang /* 1213bb08c1e7SYongqiang Yang * ext4_add_new_descs() adds @count group descriptor of groups 1214bb08c1e7SYongqiang Yang * starting at @group 1215bb08c1e7SYongqiang Yang * 1216bb08c1e7SYongqiang Yang * @handle: journal handle 1217bb08c1e7SYongqiang Yang * @sb: super block 1218bb08c1e7SYongqiang Yang * @group: the group no. of the first group desc to be added 1219bb08c1e7SYongqiang Yang * @resize_inode: the resize inode 1220bb08c1e7SYongqiang Yang * @count: number of group descriptors to be added 1221bb08c1e7SYongqiang Yang */ 1222bb08c1e7SYongqiang Yang static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, 1223bb08c1e7SYongqiang Yang ext4_group_t group, struct inode *resize_inode, 1224bb08c1e7SYongqiang Yang ext4_group_t count) 1225bb08c1e7SYongqiang Yang { 1226bb08c1e7SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1227bb08c1e7SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 1228bb08c1e7SYongqiang Yang struct buffer_head *gdb_bh; 1229bb08c1e7SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 123001f795f9SYongqiang Yang int meta_bg; 1231bb08c1e7SYongqiang Yang 1232e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 1233bb08c1e7SYongqiang Yang for (i = 0; i < count; i++, group++) { 1234bb08c1e7SYongqiang Yang int reserved_gdb = ext4_bg_has_super(sb, group) ? 1235bb08c1e7SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1236bb08c1e7SYongqiang Yang 1237bb08c1e7SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1238bb08c1e7SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1239bb08c1e7SYongqiang Yang 1240bb08c1e7SYongqiang Yang /* 1241bb08c1e7SYongqiang Yang * We will only either add reserved group blocks to a backup group 1242bb08c1e7SYongqiang Yang * or remove reserved blocks for the first group in a new group block. 1243bb08c1e7SYongqiang Yang * Doing both would be mean more complex code, and sane people don't 1244bb08c1e7SYongqiang Yang * use non-sparse filesystems anymore. This is already checked above. 1245bb08c1e7SYongqiang Yang */ 1246bb08c1e7SYongqiang Yang if (gdb_off) { 12471d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 12481d0c3924STheodore Ts'o gdb_num); 12495d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 1250188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, gdb_bh, 1251188c299eSJan Kara EXT4_JTR_NONE); 1252bb08c1e7SYongqiang Yang 1253bb08c1e7SYongqiang Yang if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) 1254bb08c1e7SYongqiang Yang err = reserve_backup_gdb(handle, resize_inode, group); 125501f795f9SYongqiang Yang } else if (meta_bg != 0) { 125601f795f9SYongqiang Yang err = add_new_gdb_meta_bg(sb, handle, group); 125701f795f9SYongqiang Yang } else { 1258bb08c1e7SYongqiang Yang err = add_new_gdb(handle, resize_inode, group); 125901f795f9SYongqiang Yang } 1260bb08c1e7SYongqiang Yang if (err) 1261bb08c1e7SYongqiang Yang break; 1262bb08c1e7SYongqiang Yang } 1263bb08c1e7SYongqiang Yang return err; 1264bb08c1e7SYongqiang Yang } 1265bb08c1e7SYongqiang Yang 126641a246d1SDarrick J. Wong static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 126741a246d1SDarrick J. Wong { 126841a246d1SDarrick J. Wong struct buffer_head *bh = sb_getblk(sb, block); 1269aebf0243SWang Shilong if (unlikely(!bh)) 127041a246d1SDarrick J. Wong return NULL; 12717f1468d1SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 12722d069c08Szhangyi (F) if (ext4_read_bh(bh, 0, NULL) < 0) { 127341a246d1SDarrick J. Wong brelse(bh); 127441a246d1SDarrick J. Wong return NULL; 127541a246d1SDarrick J. Wong } 12767f1468d1SDmitry Monakhov } 127741a246d1SDarrick J. Wong 127841a246d1SDarrick J. Wong return bh; 127941a246d1SDarrick J. Wong } 128041a246d1SDarrick J. Wong 128141a246d1SDarrick J. Wong static int ext4_set_bitmap_checksums(struct super_block *sb, 128241a246d1SDarrick J. Wong ext4_group_t group, 128341a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 128441a246d1SDarrick J. Wong struct ext4_new_group_data *group_data) 128541a246d1SDarrick J. Wong { 128641a246d1SDarrick J. Wong struct buffer_head *bh; 128741a246d1SDarrick J. Wong 12889aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(sb)) 128941a246d1SDarrick J. Wong return 0; 129041a246d1SDarrick J. Wong 129141a246d1SDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->inode_bitmap); 129241a246d1SDarrick J. Wong if (!bh) 129341a246d1SDarrick J. Wong return -EIO; 129441a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, bh, 129541a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 129641a246d1SDarrick J. Wong brelse(bh); 129741a246d1SDarrick J. Wong 1298fa77dcfaSDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->block_bitmap); 1299fa77dcfaSDarrick J. Wong if (!bh) 1300fa77dcfaSDarrick J. Wong return -EIO; 130179f1ba49STao Ma ext4_block_bitmap_csum_set(sb, group, gdp, bh); 1302fa77dcfaSDarrick J. Wong brelse(bh); 1303fa77dcfaSDarrick J. Wong 130441a246d1SDarrick J. Wong return 0; 130541a246d1SDarrick J. Wong } 130641a246d1SDarrick J. Wong 1307083f5b24SYongqiang Yang /* 1308083f5b24SYongqiang Yang * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg 1309083f5b24SYongqiang Yang */ 1310083f5b24SYongqiang Yang static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, 1311083f5b24SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 1312083f5b24SYongqiang Yang { 1313083f5b24SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 1314083f5b24SYongqiang Yang struct ext4_group_desc *gdp; 1315083f5b24SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1316083f5b24SYongqiang Yang struct buffer_head *gdb_bh; 1317083f5b24SYongqiang Yang ext4_group_t group; 1318083f5b24SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 1319083f5b24SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1320083f5b24SYongqiang Yang 1321083f5b24SYongqiang Yang 1322083f5b24SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { 1323083f5b24SYongqiang Yang group = group_data->group; 1324083f5b24SYongqiang Yang 1325083f5b24SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1326083f5b24SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1327083f5b24SYongqiang Yang 1328083f5b24SYongqiang Yang /* 1329083f5b24SYongqiang Yang * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). 1330083f5b24SYongqiang Yang */ 13311d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); 1332083f5b24SYongqiang Yang /* Update group descriptor block for new group */ 13332716b802STheodore Ts'o gdp = (struct ext4_group_desc *)(gdb_bh->b_data + 1334083f5b24SYongqiang Yang gdb_off * EXT4_DESC_SIZE(sb)); 1335083f5b24SYongqiang Yang 1336083f5b24SYongqiang Yang memset(gdp, 0, EXT4_DESC_SIZE(sb)); 1337083f5b24SYongqiang Yang ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); 1338083f5b24SYongqiang Yang ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); 133941a246d1SDarrick J. Wong err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); 134041a246d1SDarrick J. Wong if (err) { 134141a246d1SDarrick J. Wong ext4_std_error(sb, err); 134241a246d1SDarrick J. Wong break; 134341a246d1SDarrick J. Wong } 134441a246d1SDarrick J. Wong 1345083f5b24SYongqiang Yang ext4_inode_table_set(sb, gdp, group_data->inode_table); 1346083f5b24SYongqiang Yang ext4_free_group_clusters_set(sb, gdp, 1347d77147ffSharshads group_data->free_clusters_count); 1348083f5b24SYongqiang Yang ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); 134993f90526STheodore Ts'o if (ext4_has_group_desc_csum(sb)) 135093f90526STheodore Ts'o ext4_itable_unused_set(sb, gdp, 135193f90526STheodore Ts'o EXT4_INODES_PER_GROUP(sb)); 1352083f5b24SYongqiang Yang gdp->bg_flags = cpu_to_le16(*bg_flags); 1353feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1354083f5b24SYongqiang Yang 1355083f5b24SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 1356083f5b24SYongqiang Yang if (unlikely(err)) { 1357083f5b24SYongqiang Yang ext4_std_error(sb, err); 1358083f5b24SYongqiang Yang break; 1359083f5b24SYongqiang Yang } 1360083f5b24SYongqiang Yang 1361083f5b24SYongqiang Yang /* 1362083f5b24SYongqiang Yang * We can allocate memory for mb_alloc based on the new group 1363083f5b24SYongqiang Yang * descriptor 1364083f5b24SYongqiang Yang */ 1365083f5b24SYongqiang Yang err = ext4_mb_add_groupinfo(sb, group, gdp); 1366083f5b24SYongqiang Yang if (err) 1367083f5b24SYongqiang Yang break; 1368083f5b24SYongqiang Yang } 1369083f5b24SYongqiang Yang return err; 1370083f5b24SYongqiang Yang } 1371083f5b24SYongqiang Yang 13722e10e2f2SYongqiang Yang /* 13732e10e2f2SYongqiang Yang * ext4_update_super() updates the super block so that the newly added 13742e10e2f2SYongqiang Yang * groups can be seen by the filesystem. 13752e10e2f2SYongqiang Yang * 13762e10e2f2SYongqiang Yang * @sb: super block 13772e10e2f2SYongqiang Yang * @flex_gd: new added groups 13782e10e2f2SYongqiang Yang */ 13792e10e2f2SYongqiang Yang static void ext4_update_super(struct super_block *sb, 13802e10e2f2SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 13812e10e2f2SYongqiang Yang { 13822e10e2f2SYongqiang Yang ext4_fsblk_t blocks_count = 0; 13832e10e2f2SYongqiang Yang ext4_fsblk_t free_blocks = 0; 13842e10e2f2SYongqiang Yang ext4_fsblk_t reserved_blocks = 0; 13852e10e2f2SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 13862e10e2f2SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 13872e10e2f2SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 13888a991849STheodore Ts'o int i; 13892e10e2f2SYongqiang Yang 13902e10e2f2SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 13912e10e2f2SYongqiang Yang /* 13922e10e2f2SYongqiang Yang * Make the new blocks and inodes valid next. We do this before 13932e10e2f2SYongqiang Yang * increasing the group count so that once the group is enabled, 13942e10e2f2SYongqiang Yang * all of its blocks and inodes are already valid. 13952e10e2f2SYongqiang Yang * 13962e10e2f2SYongqiang Yang * We always allocate group-by-group, then block-by-block or 13972e10e2f2SYongqiang Yang * inode-by-inode within a group, so enabling these 13982e10e2f2SYongqiang Yang * blocks/inodes before the group is live won't actually let us 13992e10e2f2SYongqiang Yang * allocate the new space yet. 14002e10e2f2SYongqiang Yang */ 14012e10e2f2SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 14022e10e2f2SYongqiang Yang blocks_count += group_data[i].blocks_count; 1403d77147ffSharshads free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); 14042e10e2f2SYongqiang Yang } 14052e10e2f2SYongqiang Yang 14062e10e2f2SYongqiang Yang reserved_blocks = ext4_r_blocks_count(es) * 100; 140701f795f9SYongqiang Yang reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); 14082e10e2f2SYongqiang Yang reserved_blocks *= blocks_count; 14092e10e2f2SYongqiang Yang do_div(reserved_blocks, 100); 14102e10e2f2SYongqiang Yang 141105c2c00fSJan Kara lock_buffer(sbi->s_sbh); 14122e10e2f2SYongqiang Yang ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); 1413636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); 14142e10e2f2SYongqiang Yang le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * 14152e10e2f2SYongqiang Yang flex_gd->count); 1416636d7e2eSDarrick J. Wong le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * 1417636d7e2eSDarrick J. Wong flex_gd->count); 14182e10e2f2SYongqiang Yang 141901f795f9SYongqiang Yang ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); 14202e10e2f2SYongqiang Yang /* 14212e10e2f2SYongqiang Yang * We need to protect s_groups_count against other CPUs seeing 14222e10e2f2SYongqiang Yang * inconsistent state in the superblock. 14232e10e2f2SYongqiang Yang * 14242e10e2f2SYongqiang Yang * The precise rules we use are: 14252e10e2f2SYongqiang Yang * 14262e10e2f2SYongqiang Yang * * Writers must perform a smp_wmb() after updating all 14272e10e2f2SYongqiang Yang * dependent data and before modifying the groups count 14282e10e2f2SYongqiang Yang * 14292e10e2f2SYongqiang Yang * * Readers must perform an smp_rmb() after reading the groups 14302e10e2f2SYongqiang Yang * count and before reading any dependent data. 14312e10e2f2SYongqiang Yang * 14322e10e2f2SYongqiang Yang * NB. These rules can be relaxed when checking the group count 14332e10e2f2SYongqiang Yang * while freeing data, as we can only allocate from a block 14342e10e2f2SYongqiang Yang * group after serialising against the group count, and we can 14352e10e2f2SYongqiang Yang * only then free after serialising in turn against that 14362e10e2f2SYongqiang Yang * allocation. 14372e10e2f2SYongqiang Yang */ 14382e10e2f2SYongqiang Yang smp_wmb(); 14392e10e2f2SYongqiang Yang 14402e10e2f2SYongqiang Yang /* Update the global fs size fields */ 14412e10e2f2SYongqiang Yang sbi->s_groups_count += flex_gd->count; 1442c5c72d81STheodore Ts'o sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 1443c5c72d81STheodore Ts'o (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 14442e10e2f2SYongqiang Yang 14452e10e2f2SYongqiang Yang /* Update the reserved block counts only once the new group is 14462e10e2f2SYongqiang Yang * active. */ 14472e10e2f2SYongqiang Yang ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + 14482e10e2f2SYongqiang Yang reserved_blocks); 144905c2c00fSJan Kara ext4_superblock_csum_set(sb); 145005c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 14512e10e2f2SYongqiang Yang 14522e10e2f2SYongqiang Yang /* Update the free space counts */ 14532e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeclusters_counter, 1454810da240SLukas Czerner EXT4_NUM_B2C(sbi, free_blocks)); 14552e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeinodes_counter, 14562e10e2f2SYongqiang Yang EXT4_INODES_PER_GROUP(sb) * flex_gd->count); 14572e10e2f2SYongqiang Yang 145801f795f9SYongqiang Yang ext4_debug("free blocks count %llu", 145901f795f9SYongqiang Yang percpu_counter_read(&sbi->s_freeclusters_counter)); 1460e2b911c5SDarrick J. Wong if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { 14612e10e2f2SYongqiang Yang ext4_group_t flex_group; 14627c990728SSuraj Jitindar Singh struct flex_groups *fg; 14637c990728SSuraj Jitindar Singh 14642e10e2f2SYongqiang Yang flex_group = ext4_flex_group(sbi, group_data[0].group); 14657c990728SSuraj Jitindar Singh fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); 146690ba983fSTheodore Ts'o atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), 14677c990728SSuraj Jitindar Singh &fg->free_clusters); 14682e10e2f2SYongqiang Yang atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, 14697c990728SSuraj Jitindar Singh &fg->free_inodes); 14702e10e2f2SYongqiang Yang } 14712e10e2f2SYongqiang Yang 1472952fc18eSTheodore Ts'o /* 1473952fc18eSTheodore Ts'o * Update the fs overhead information 1474952fc18eSTheodore Ts'o */ 1475952fc18eSTheodore Ts'o ext4_calculate_overhead(sb); 1476952fc18eSTheodore Ts'o 14772e10e2f2SYongqiang Yang if (test_opt(sb, DEBUG)) 14782e10e2f2SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: added group %u:" 14792e10e2f2SYongqiang Yang "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, 14802e10e2f2SYongqiang Yang blocks_count, free_blocks, reserved_blocks); 14812e10e2f2SYongqiang Yang } 14822e10e2f2SYongqiang Yang 14834bac1f8cSYongqiang Yang /* Add a flex group to an fs. Ensure we handle all possible error conditions 14844bac1f8cSYongqiang Yang * _before_ we start modifying the filesystem, because we cannot abort the 14854bac1f8cSYongqiang Yang * transaction and not have it write the data to disk. 14864bac1f8cSYongqiang Yang */ 14874bac1f8cSYongqiang Yang static int ext4_flex_group_add(struct super_block *sb, 14884bac1f8cSYongqiang Yang struct inode *resize_inode, 14894bac1f8cSYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 14904bac1f8cSYongqiang Yang { 14914bac1f8cSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 14924bac1f8cSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 14934bac1f8cSYongqiang Yang ext4_fsblk_t o_blocks_count; 14944bac1f8cSYongqiang Yang ext4_grpblk_t last; 14954bac1f8cSYongqiang Yang ext4_group_t group; 14964bac1f8cSYongqiang Yang handle_t *handle; 14974bac1f8cSYongqiang Yang unsigned reserved_gdb; 14984bac1f8cSYongqiang Yang int err = 0, err2 = 0, credit; 14994bac1f8cSYongqiang Yang 15004bac1f8cSYongqiang Yang BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); 15014bac1f8cSYongqiang Yang 15024bac1f8cSYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 15034bac1f8cSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 15044bac1f8cSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 15054bac1f8cSYongqiang Yang BUG_ON(last); 15064bac1f8cSYongqiang Yang 15074bac1f8cSYongqiang Yang err = setup_new_flex_group_blocks(sb, flex_gd); 15084bac1f8cSYongqiang Yang if (err) 15094bac1f8cSYongqiang Yang goto exit; 15104bac1f8cSYongqiang Yang /* 15114bac1f8cSYongqiang Yang * We will always be modifying at least the superblock and GDT 15122c869b26SJan Kara * blocks. If we are adding a group past the last current GDT block, 15134bac1f8cSYongqiang Yang * we will also modify the inode and the dindirect block. If we 15144bac1f8cSYongqiang Yang * are adding a group with superblock/GDT backups we will also 15154bac1f8cSYongqiang Yang * modify each of the reserved GDT dindirect blocks. 15164bac1f8cSYongqiang Yang */ 15172c869b26SJan Kara credit = 3; /* sb, resize inode, resize inode dindirect */ 15182c869b26SJan Kara /* GDT blocks */ 15192c869b26SJan Kara credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); 15202c869b26SJan Kara credit += reserved_gdb; /* Reserved GDT dindirect blocks */ 15219924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); 15224bac1f8cSYongqiang Yang if (IS_ERR(handle)) { 15234bac1f8cSYongqiang Yang err = PTR_ERR(handle); 15244bac1f8cSYongqiang Yang goto exit; 15254bac1f8cSYongqiang Yang } 15264bac1f8cSYongqiang Yang 15275d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1528188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1529188c299eSJan Kara EXT4_JTR_NONE); 15304bac1f8cSYongqiang Yang if (err) 15314bac1f8cSYongqiang Yang goto exit_journal; 15324bac1f8cSYongqiang Yang 15334bac1f8cSYongqiang Yang group = flex_gd->groups[0].group; 153449598e04SJun Piao BUG_ON(group != sbi->s_groups_count); 15354bac1f8cSYongqiang Yang err = ext4_add_new_descs(handle, sb, group, 15364bac1f8cSYongqiang Yang resize_inode, flex_gd->count); 15374bac1f8cSYongqiang Yang if (err) 15384bac1f8cSYongqiang Yang goto exit_journal; 15394bac1f8cSYongqiang Yang 15404bac1f8cSYongqiang Yang err = ext4_setup_new_descs(handle, sb, flex_gd); 15414bac1f8cSYongqiang Yang if (err) 15424bac1f8cSYongqiang Yang goto exit_journal; 15434bac1f8cSYongqiang Yang 15444bac1f8cSYongqiang Yang ext4_update_super(sb, flex_gd); 15454bac1f8cSYongqiang Yang 1546a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 15474bac1f8cSYongqiang Yang 15484bac1f8cSYongqiang Yang exit_journal: 15494bac1f8cSYongqiang Yang err2 = ext4_journal_stop(handle); 15504bac1f8cSYongqiang Yang if (!err) 15514bac1f8cSYongqiang Yang err = err2; 15524bac1f8cSYongqiang Yang 15534bac1f8cSYongqiang Yang if (!err) { 15542ebd1704SYongqiang Yang int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 15552ebd1704SYongqiang Yang int gdb_num_end = ((group + flex_gd->count - 1) / 15562ebd1704SYongqiang Yang EXT4_DESC_PER_BLOCK(sb)); 1557e2b911c5SDarrick J. Wong int meta_bg = ext4_has_feature_meta_bg(sb); 15580acdb887STao Ma sector_t old_gdb = 0; 15592ebd1704SYongqiang Yang 15604bac1f8cSYongqiang Yang update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, 156101f795f9SYongqiang Yang sizeof(struct ext4_super_block), 0); 15622ebd1704SYongqiang Yang for (; gdb_num <= gdb_num_end; gdb_num++) { 15634bac1f8cSYongqiang Yang struct buffer_head *gdb_bh; 15642ebd1704SYongqiang Yang 15651d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 15661d0c3924STheodore Ts'o gdb_num); 15670acdb887STao Ma if (old_gdb == gdb_bh->b_blocknr) 15680acdb887STao Ma continue; 15694bac1f8cSYongqiang Yang update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, 157001f795f9SYongqiang Yang gdb_bh->b_size, meta_bg); 15710acdb887STao Ma old_gdb = gdb_bh->b_blocknr; 15724bac1f8cSYongqiang Yang } 15734bac1f8cSYongqiang Yang } 15744bac1f8cSYongqiang Yang exit: 15754bac1f8cSYongqiang Yang return err; 15764bac1f8cSYongqiang Yang } 15774bac1f8cSYongqiang Yang 157819c5246dSYongqiang Yang static int ext4_setup_next_flex_gd(struct super_block *sb, 157919c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 158019c5246dSYongqiang Yang ext4_fsblk_t n_blocks_count, 158119c5246dSYongqiang Yang unsigned long flexbg_size) 158219c5246dSYongqiang Yang { 1583d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 1584d77147ffSharshads struct ext4_super_block *es = sbi->s_es; 158519c5246dSYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 158619c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 158719c5246dSYongqiang Yang ext4_group_t n_group; 158819c5246dSYongqiang Yang ext4_group_t group; 158919c5246dSYongqiang Yang ext4_group_t last_group; 159019c5246dSYongqiang Yang ext4_grpblk_t last; 1591d77147ffSharshads ext4_grpblk_t clusters_per_group; 159219c5246dSYongqiang Yang unsigned long i; 159319c5246dSYongqiang Yang 1594d77147ffSharshads clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); 159519c5246dSYongqiang Yang 159619c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 159719c5246dSYongqiang Yang 159819c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 159919c5246dSYongqiang Yang return 0; 160019c5246dSYongqiang Yang 160119c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 160219c5246dSYongqiang Yang BUG_ON(last); 160319c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); 160419c5246dSYongqiang Yang 160519c5246dSYongqiang Yang last_group = group | (flexbg_size - 1); 160619c5246dSYongqiang Yang if (last_group > n_group) 160719c5246dSYongqiang Yang last_group = n_group; 160819c5246dSYongqiang Yang 160919c5246dSYongqiang Yang flex_gd->count = last_group - group + 1; 161019c5246dSYongqiang Yang 161119c5246dSYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 161219c5246dSYongqiang Yang int overhead; 161319c5246dSYongqiang Yang 161419c5246dSYongqiang Yang group_data[i].group = group + i; 1615d77147ffSharshads group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); 161601f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group + i); 1617d77147ffSharshads group_data[i].mdata_blocks = overhead; 1618d77147ffSharshads group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); 16197f511862STheodore Ts'o if (ext4_has_group_desc_csum(sb)) { 162019c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | 162119c5246dSYongqiang Yang EXT4_BG_INODE_UNINIT; 16227f511862STheodore Ts'o if (!test_opt(sb, INIT_INODE_TABLE)) 16237f511862STheodore Ts'o flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; 16247f511862STheodore Ts'o } else 162519c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; 162619c5246dSYongqiang Yang } 162719c5246dSYongqiang Yang 1628feb0ab32SDarrick J. Wong if (last_group == n_group && ext4_has_group_desc_csum(sb)) 162919c5246dSYongqiang Yang /* We need to initialize block bitmap of last group. */ 163019c5246dSYongqiang Yang flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; 163119c5246dSYongqiang Yang 1632d77147ffSharshads if ((last_group == n_group) && (last != clusters_per_group - 1)) { 1633d77147ffSharshads group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); 1634d77147ffSharshads group_data[i - 1].free_clusters_count -= clusters_per_group - 163519c5246dSYongqiang Yang last - 1; 163619c5246dSYongqiang Yang } 163719c5246dSYongqiang Yang 163819c5246dSYongqiang Yang return 1; 163919c5246dSYongqiang Yang } 164019c5246dSYongqiang Yang 1641ac27a0ecSDave Kleikamp /* Add group descriptor data to an existing or new group descriptor block. 1642ac27a0ecSDave Kleikamp * Ensure we handle all possible error conditions _before_ we start modifying 1643ac27a0ecSDave Kleikamp * the filesystem, because we cannot abort the transaction and not have it 1644ac27a0ecSDave Kleikamp * write the data to disk. 1645ac27a0ecSDave Kleikamp * 1646ac27a0ecSDave Kleikamp * If we are on a GDT block boundary, we need to get the reserved GDT block. 1647ac27a0ecSDave Kleikamp * Otherwise, we may need to add backup GDT blocks for a sparse group. 1648ac27a0ecSDave Kleikamp * 1649ac27a0ecSDave Kleikamp * We only need to hold the superblock lock while we are actually adding 1650ac27a0ecSDave Kleikamp * in the new group's counts to the superblock. Prior to that we have 1651ac27a0ecSDave Kleikamp * not really "added" the group at all. We re-check that we are still 1652ac27a0ecSDave Kleikamp * adding in the last group in case things have changed since verifying. 1653ac27a0ecSDave Kleikamp */ 1654617ba13bSMingming Cao int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 1655ac27a0ecSDave Kleikamp { 165661f296ccSYongqiang Yang struct ext4_new_flex_group_data flex_gd; 1657617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1658617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 1659617ba13bSMingming Cao int reserved_gdb = ext4_bg_has_super(sb, input->group) ? 1660ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1661ac27a0ecSDave Kleikamp struct inode *inode = NULL; 166203b40e34SJon Ernst int gdb_off; 166361f296ccSYongqiang Yang int err; 166461f296ccSYongqiang Yang __u16 bg_flags = 0; 1665ac27a0ecSDave Kleikamp 1666617ba13bSMingming Cao gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); 1667ac27a0ecSDave Kleikamp 1668e2b911c5SDarrick J. Wong if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { 166912062dddSEric Sandeen ext4_warning(sb, "Can't resize non-sparse filesystem further"); 1670ac27a0ecSDave Kleikamp return -EPERM; 1671ac27a0ecSDave Kleikamp } 1672ac27a0ecSDave Kleikamp 1673bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) + input->blocks_count < 1674bd81d8eeSLaurent Vivier ext4_blocks_count(es)) { 167512062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1676ac27a0ecSDave Kleikamp return -EINVAL; 1677ac27a0ecSDave Kleikamp } 1678ac27a0ecSDave Kleikamp 1679617ba13bSMingming Cao if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < 1680ac27a0ecSDave Kleikamp le32_to_cpu(es->s_inodes_count)) { 168112062dddSEric Sandeen ext4_warning(sb, "inodes_count overflow"); 1682ac27a0ecSDave Kleikamp return -EINVAL; 1683ac27a0ecSDave Kleikamp } 1684ac27a0ecSDave Kleikamp 1685ac27a0ecSDave Kleikamp if (reserved_gdb || gdb_off == 0) { 1686e647e291Sruippan (潘睿) if (!ext4_has_feature_resize_inode(sb) || 1687e2b911c5SDarrick J. Wong !le16_to_cpu(es->s_reserved_gdt_blocks)) { 168812062dddSEric Sandeen ext4_warning(sb, 1689ac27a0ecSDave Kleikamp "No reserved GDT blocks, can't resize"); 1690ac27a0ecSDave Kleikamp return -EPERM; 1691ac27a0ecSDave Kleikamp } 16928a363970STheodore Ts'o inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); 16931d1fe1eeSDavid Howells if (IS_ERR(inode)) { 169412062dddSEric Sandeen ext4_warning(sb, "Error opening resize inode"); 16951d1fe1eeSDavid Howells return PTR_ERR(inode); 1696ac27a0ecSDave Kleikamp } 1697ac27a0ecSDave Kleikamp } 1698ac27a0ecSDave Kleikamp 1699920313a7SAneesh Kumar K.V 170061f296ccSYongqiang Yang err = verify_group_input(sb, input); 1701668f4dc5SYongqiang Yang if (err) 170261f296ccSYongqiang Yang goto out; 1703ac27a0ecSDave Kleikamp 1704117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, input->group + 1); 1705117fff10STheodore Ts'o if (err) 17067f511862STheodore Ts'o goto out; 1707117fff10STheodore Ts'o 170828623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, input->group + 1); 170928623c2fSTheodore Ts'o if (err) 171028623c2fSTheodore Ts'o goto out; 171128623c2fSTheodore Ts'o 171261f296ccSYongqiang Yang flex_gd.count = 1; 171361f296ccSYongqiang Yang flex_gd.groups = input; 171461f296ccSYongqiang Yang flex_gd.bg_flags = &bg_flags; 171561f296ccSYongqiang Yang err = ext4_flex_group_add(sb, inode, &flex_gd); 171661f296ccSYongqiang Yang out: 1717ac27a0ecSDave Kleikamp iput(inode); 1718ac27a0ecSDave Kleikamp return err; 1719617ba13bSMingming Cao } /* ext4_group_add */ 1720ac27a0ecSDave Kleikamp 17212b2d6d01STheodore Ts'o /* 172218e31438SYongqiang Yang * extend a group without checking assuming that checking has been done. 172318e31438SYongqiang Yang */ 172418e31438SYongqiang Yang static int ext4_group_extend_no_check(struct super_block *sb, 172518e31438SYongqiang Yang ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) 172618e31438SYongqiang Yang { 172718e31438SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 172818e31438SYongqiang Yang handle_t *handle; 172918e31438SYongqiang Yang int err = 0, err2; 173018e31438SYongqiang Yang 173118e31438SYongqiang Yang /* We will update the superblock, one block bitmap, and 173218e31438SYongqiang Yang * one group descriptor via ext4_group_add_blocks(). 173318e31438SYongqiang Yang */ 17349924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); 173518e31438SYongqiang Yang if (IS_ERR(handle)) { 173618e31438SYongqiang Yang err = PTR_ERR(handle); 173718e31438SYongqiang Yang ext4_warning(sb, "error %d on journal start", err); 173818e31438SYongqiang Yang return err; 173918e31438SYongqiang Yang } 174018e31438SYongqiang Yang 17415d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 1742188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 1743188c299eSJan Kara EXT4_JTR_NONE); 174418e31438SYongqiang Yang if (err) { 174518e31438SYongqiang Yang ext4_warning(sb, "error %d on journal write access", err); 174618e31438SYongqiang Yang goto errout; 174718e31438SYongqiang Yang } 174818e31438SYongqiang Yang 174905c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 175018e31438SYongqiang Yang ext4_blocks_count_set(es, o_blocks_count + add); 1751636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); 175205c2c00fSJan Kara ext4_superblock_csum_set(sb); 175305c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 175418e31438SYongqiang Yang ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, 175518e31438SYongqiang Yang o_blocks_count + add); 175618e31438SYongqiang Yang /* We add the blocks to the bitmap and set the group need init bit */ 175718e31438SYongqiang Yang err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); 175818e31438SYongqiang Yang if (err) 175918e31438SYongqiang Yang goto errout; 1760a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 176118e31438SYongqiang Yang ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, 176218e31438SYongqiang Yang o_blocks_count + add); 176318e31438SYongqiang Yang errout: 176418e31438SYongqiang Yang err2 = ext4_journal_stop(handle); 176518e31438SYongqiang Yang if (err2 && !err) 176618e31438SYongqiang Yang err = err2; 176718e31438SYongqiang Yang 176818e31438SYongqiang Yang if (!err) { 176918e31438SYongqiang Yang if (test_opt(sb, DEBUG)) 177018e31438SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: extended group to %llu " 177118e31438SYongqiang Yang "blocks\n", ext4_blocks_count(es)); 17726ca792edSMaarten ter Huurne update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, 177301f795f9SYongqiang Yang (char *)es, sizeof(struct ext4_super_block), 0); 177418e31438SYongqiang Yang } 177518e31438SYongqiang Yang return err; 177618e31438SYongqiang Yang } 177718e31438SYongqiang Yang 177818e31438SYongqiang Yang /* 17792b2d6d01STheodore Ts'o * Extend the filesystem to the new number of blocks specified. This entry 1780ac27a0ecSDave Kleikamp * point is only used to extend the current filesystem to the end of the last 1781ac27a0ecSDave Kleikamp * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" 1782ac27a0ecSDave Kleikamp * for emergencies (because it has no dependencies on reserved blocks). 1783ac27a0ecSDave Kleikamp * 1784617ba13bSMingming Cao * If we _really_ wanted, we could use default values to call ext4_group_add() 1785ac27a0ecSDave Kleikamp * allow the "remount" trick to work for arbitrary resizing, assuming enough 1786ac27a0ecSDave Kleikamp * GDT blocks are reserved to grow to the desired size. 1787ac27a0ecSDave Kleikamp */ 1788617ba13bSMingming Cao int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, 1789617ba13bSMingming Cao ext4_fsblk_t n_blocks_count) 1790ac27a0ecSDave Kleikamp { 1791617ba13bSMingming Cao ext4_fsblk_t o_blocks_count; 1792617ba13bSMingming Cao ext4_grpblk_t last; 1793617ba13bSMingming Cao ext4_grpblk_t add; 1794ac27a0ecSDave Kleikamp struct buffer_head *bh; 1795d89651c8SYongqiang Yang int err; 17965f21b0e6SFrederic Bohe ext4_group_t group; 1797ac27a0ecSDave Kleikamp 1798bd81d8eeSLaurent Vivier o_blocks_count = ext4_blocks_count(es); 1799ac27a0ecSDave Kleikamp 1800ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 180192b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, 180292b97816STheodore Ts'o "extending last group from %llu to %llu blocks", 1803ac27a0ecSDave Kleikamp o_blocks_count, n_blocks_count); 1804ac27a0ecSDave Kleikamp 1805ac27a0ecSDave Kleikamp if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) 1806ac27a0ecSDave Kleikamp return 0; 1807ac27a0ecSDave Kleikamp 1808ac27a0ecSDave Kleikamp if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 180992b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, 181092b97816STheodore Ts'o "filesystem too large to resize to %llu blocks safely", 181192b97816STheodore Ts'o n_blocks_count); 1812ac27a0ecSDave Kleikamp return -EINVAL; 1813ac27a0ecSDave Kleikamp } 1814ac27a0ecSDave Kleikamp 1815ac27a0ecSDave Kleikamp if (n_blocks_count < o_blocks_count) { 181612062dddSEric Sandeen ext4_warning(sb, "can't shrink FS - resize aborted"); 18178f82f840SYongqiang Yang return -EINVAL; 1818ac27a0ecSDave Kleikamp } 1819ac27a0ecSDave Kleikamp 1820ac27a0ecSDave Kleikamp /* Handle the remaining blocks in the last group only. */ 18215f21b0e6SFrederic Bohe ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 1822ac27a0ecSDave Kleikamp 1823ac27a0ecSDave Kleikamp if (last == 0) { 182412062dddSEric Sandeen ext4_warning(sb, "need to use ext2online to resize further"); 1825ac27a0ecSDave Kleikamp return -EPERM; 1826ac27a0ecSDave Kleikamp } 1827ac27a0ecSDave Kleikamp 1828617ba13bSMingming Cao add = EXT4_BLOCKS_PER_GROUP(sb) - last; 1829ac27a0ecSDave Kleikamp 1830ac27a0ecSDave Kleikamp if (o_blocks_count + add < o_blocks_count) { 183112062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1832ac27a0ecSDave Kleikamp return -EINVAL; 1833ac27a0ecSDave Kleikamp } 1834ac27a0ecSDave Kleikamp 1835ac27a0ecSDave Kleikamp if (o_blocks_count + add > n_blocks_count) 1836ac27a0ecSDave Kleikamp add = n_blocks_count - o_blocks_count; 1837ac27a0ecSDave Kleikamp 1838ac27a0ecSDave Kleikamp if (o_blocks_count + add < n_blocks_count) 183912062dddSEric Sandeen ext4_warning(sb, "will only finish group (%llu blocks, %u new)", 1840ac27a0ecSDave Kleikamp o_blocks_count + add, add); 1841ac27a0ecSDave Kleikamp 1842ac27a0ecSDave Kleikamp /* See if the device is actually as big as what was requested */ 18430a846f49Szhangyi (F) bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); 18440a846f49Szhangyi (F) if (IS_ERR(bh)) { 184512062dddSEric Sandeen ext4_warning(sb, "can't read last block, resize aborted"); 1846ac27a0ecSDave Kleikamp return -ENOSPC; 1847ac27a0ecSDave Kleikamp } 1848ac27a0ecSDave Kleikamp brelse(bh); 1849ac27a0ecSDave Kleikamp 1850d89651c8SYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 1851ac27a0ecSDave Kleikamp return err; 1852617ba13bSMingming Cao } /* ext4_group_extend */ 185319c5246dSYongqiang Yang 18541c6bd717STheodore Ts'o 18551c6bd717STheodore Ts'o static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) 18561c6bd717STheodore Ts'o { 18571c6bd717STheodore Ts'o return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); 18581c6bd717STheodore Ts'o } 18591c6bd717STheodore Ts'o 18601c6bd717STheodore Ts'o /* 18611c6bd717STheodore Ts'o * Release the resize inode and drop the resize_inode feature if there 18621c6bd717STheodore Ts'o * are no more reserved gdt blocks, and then convert the file system 18631c6bd717STheodore Ts'o * to enable meta_bg 18641c6bd717STheodore Ts'o */ 18651c6bd717STheodore Ts'o static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) 18661c6bd717STheodore Ts'o { 18671c6bd717STheodore Ts'o handle_t *handle; 18681c6bd717STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 18691c6bd717STheodore Ts'o struct ext4_super_block *es = sbi->s_es; 187059e31c15STheodore Ts'o struct ext4_inode_info *ei = EXT4_I(inode); 18711c6bd717STheodore Ts'o ext4_fsblk_t nr; 18721c6bd717STheodore Ts'o int i, ret, err = 0; 18731c6bd717STheodore Ts'o int credits = 1; 18741c6bd717STheodore Ts'o 18751c6bd717STheodore Ts'o ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); 187659e31c15STheodore Ts'o if (inode) { 18771c6bd717STheodore Ts'o if (es->s_reserved_gdt_blocks) { 18781c6bd717STheodore Ts'o ext4_error(sb, "Unexpected non-zero " 18791c6bd717STheodore Ts'o "s_reserved_gdt_blocks"); 18801c6bd717STheodore Ts'o return -EPERM; 18811c6bd717STheodore Ts'o } 18821c6bd717STheodore Ts'o 18831c6bd717STheodore Ts'o /* Do a quick sanity check of the resize inode */ 1884d77147ffSharshads if (inode->i_blocks != 1 << (inode->i_blkbits - 1885d77147ffSharshads (9 - sbi->s_cluster_bits))) 18861c6bd717STheodore Ts'o goto invalid_resize_inode; 18871c6bd717STheodore Ts'o for (i = 0; i < EXT4_N_BLOCKS; i++) { 18881c6bd717STheodore Ts'o if (i == EXT4_DIND_BLOCK) { 18891c6bd717STheodore Ts'o if (ei->i_data[i]) 18901c6bd717STheodore Ts'o continue; 18911c6bd717STheodore Ts'o else 18921c6bd717STheodore Ts'o goto invalid_resize_inode; 18931c6bd717STheodore Ts'o } 18941c6bd717STheodore Ts'o if (ei->i_data[i]) 18951c6bd717STheodore Ts'o goto invalid_resize_inode; 18961c6bd717STheodore Ts'o } 18971c6bd717STheodore Ts'o credits += 3; /* block bitmap, bg descriptor, resize inode */ 18981c6bd717STheodore Ts'o } 18991c6bd717STheodore Ts'o 19009924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); 19011c6bd717STheodore Ts'o if (IS_ERR(handle)) 19021c6bd717STheodore Ts'o return PTR_ERR(handle); 19031c6bd717STheodore Ts'o 19045d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 1905188c299eSJan Kara err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh, 1906188c299eSJan Kara EXT4_JTR_NONE); 19071c6bd717STheodore Ts'o if (err) 19081c6bd717STheodore Ts'o goto errout; 19091c6bd717STheodore Ts'o 191005c2c00fSJan Kara lock_buffer(sbi->s_sbh); 1911e2b911c5SDarrick J. Wong ext4_clear_feature_resize_inode(sb); 1912e2b911c5SDarrick J. Wong ext4_set_feature_meta_bg(sb); 19131c6bd717STheodore Ts'o sbi->s_es->s_first_meta_bg = 19141c6bd717STheodore Ts'o cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); 191505c2c00fSJan Kara ext4_superblock_csum_set(sb); 191605c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 19171c6bd717STheodore Ts'o 1918a3f5cf14SJan Kara err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); 19191c6bd717STheodore Ts'o if (err) { 19201c6bd717STheodore Ts'o ext4_std_error(sb, err); 19211c6bd717STheodore Ts'o goto errout; 19221c6bd717STheodore Ts'o } 19231c6bd717STheodore Ts'o 19241c6bd717STheodore Ts'o if (inode) { 19251c6bd717STheodore Ts'o nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); 19261c6bd717STheodore Ts'o ext4_free_blocks(handle, inode, NULL, nr, 1, 19271c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 19281c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 19291c6bd717STheodore Ts'o ei->i_data[EXT4_DIND_BLOCK] = 0; 19301c6bd717STheodore Ts'o inode->i_blocks = 0; 19311c6bd717STheodore Ts'o 19321c6bd717STheodore Ts'o err = ext4_mark_inode_dirty(handle, inode); 19331c6bd717STheodore Ts'o if (err) 19341c6bd717STheodore Ts'o ext4_std_error(sb, err); 19351c6bd717STheodore Ts'o } 19361c6bd717STheodore Ts'o 19371c6bd717STheodore Ts'o errout: 19381c6bd717STheodore Ts'o ret = ext4_journal_stop(handle); 19391c6bd717STheodore Ts'o if (!err) 19401c6bd717STheodore Ts'o err = ret; 19411c6bd717STheodore Ts'o return ret; 19421c6bd717STheodore Ts'o 19431c6bd717STheodore Ts'o invalid_resize_inode: 19441c6bd717STheodore Ts'o ext4_error(sb, "corrupted/inconsistent resize inode"); 19451c6bd717STheodore Ts'o return -EINVAL; 19461c6bd717STheodore Ts'o } 19471c6bd717STheodore Ts'o 194819c5246dSYongqiang Yang /* 194919c5246dSYongqiang Yang * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count 195019c5246dSYongqiang Yang * 195119c5246dSYongqiang Yang * @sb: super block of the fs to be resized 195219c5246dSYongqiang Yang * @n_blocks_count: the number of blocks resides in the resized fs 195319c5246dSYongqiang Yang */ 195419c5246dSYongqiang Yang int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 195519c5246dSYongqiang Yang { 195619c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd = NULL; 195719c5246dSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 195819c5246dSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 195919c5246dSYongqiang Yang struct buffer_head *bh; 196001f795f9SYongqiang Yang struct inode *resize_inode = NULL; 196101f795f9SYongqiang Yang ext4_grpblk_t add, offset; 196219c5246dSYongqiang Yang unsigned long n_desc_blocks; 196319c5246dSYongqiang Yang unsigned long o_desc_blocks; 196401f795f9SYongqiang Yang ext4_group_t o_group; 196501f795f9SYongqiang Yang ext4_group_t n_group; 196601f795f9SYongqiang Yang ext4_fsblk_t o_blocks_count; 19671c6bd717STheodore Ts'o ext4_fsblk_t n_blocks_count_retry = 0; 19684da4a56eSTheodore Ts'o unsigned long last_update_time = 0; 1969117fff10STheodore Ts'o int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; 197001f795f9SYongqiang Yang int meta_bg; 197119c5246dSYongqiang Yang 197259e31c15STheodore Ts'o /* See if the device is actually as big as what was requested */ 19730a846f49Szhangyi (F) bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); 19740a846f49Szhangyi (F) if (IS_ERR(bh)) { 197559e31c15STheodore Ts'o ext4_warning(sb, "can't read last block, resize aborted"); 197659e31c15STheodore Ts'o return -ENOSPC; 197759e31c15STheodore Ts'o } 197859e31c15STheodore Ts'o brelse(bh); 197959e31c15STheodore Ts'o 19801c6bd717STheodore Ts'o retry: 198119c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 198219c5246dSYongqiang Yang 198359e31c15STheodore Ts'o ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " 198492b97816STheodore Ts'o "to %llu blocks", o_blocks_count, n_blocks_count); 198519c5246dSYongqiang Yang 198619c5246dSYongqiang Yang if (n_blocks_count < o_blocks_count) { 198719c5246dSYongqiang Yang /* On-line shrinking not supported */ 198819c5246dSYongqiang Yang ext4_warning(sb, "can't shrink FS - resize aborted"); 198919c5246dSYongqiang Yang return -EINVAL; 199019c5246dSYongqiang Yang } 199119c5246dSYongqiang Yang 199219c5246dSYongqiang Yang if (n_blocks_count == o_blocks_count) 199319c5246dSYongqiang Yang /* Nothing need to do */ 199419c5246dSYongqiang Yang return 0; 199519c5246dSYongqiang Yang 1996bd86298eSLukas Czerner n_group = ext4_get_group_number(sb, n_blocks_count - 1); 19974f2f76f7SJan Kara if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { 19983f8a6411STheodore Ts'o ext4_warning(sb, "resize would cause inodes_count overflow"); 19993f8a6411STheodore Ts'o return -EINVAL; 20003f8a6411STheodore Ts'o } 2001a0ade1deSLukas Czerner ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); 200219c5246dSYongqiang Yang 20031c6bd717STheodore Ts'o n_desc_blocks = num_desc_blocks(sb, n_group + 1); 20041c6bd717STheodore Ts'o o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); 200519c5246dSYongqiang Yang 2006e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 200701f795f9SYongqiang Yang 2008e2b911c5SDarrick J. Wong if (ext4_has_feature_resize_inode(sb)) { 200901f795f9SYongqiang Yang if (meta_bg) { 201001f795f9SYongqiang Yang ext4_error(sb, "resize_inode and meta_bg enabled " 201101f795f9SYongqiang Yang "simultaneously"); 201201f795f9SYongqiang Yang return -EINVAL; 201301f795f9SYongqiang Yang } 20141c6bd717STheodore Ts'o if (n_desc_blocks > o_desc_blocks + 20151c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks)) { 20161c6bd717STheodore Ts'o n_blocks_count_retry = n_blocks_count; 20171c6bd717STheodore Ts'o n_desc_blocks = o_desc_blocks + 20181c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks); 20191c6bd717STheodore Ts'o n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); 2020aec51758SJerry Lee n_blocks_count = (ext4_fsblk_t)n_group * 2021f96c3ac8SJan Kara EXT4_BLOCKS_PER_GROUP(sb) + 2022f96c3ac8SJan Kara le32_to_cpu(es->s_first_data_block); 20231c6bd717STheodore Ts'o n_group--; /* set to last group number */ 202419c5246dSYongqiang Yang } 20251c6bd717STheodore Ts'o 20261c6bd717STheodore Ts'o if (!resize_inode) 20278a363970STheodore Ts'o resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, 20288a363970STheodore Ts'o EXT4_IGET_SPECIAL); 202919c5246dSYongqiang Yang if (IS_ERR(resize_inode)) { 203019c5246dSYongqiang Yang ext4_warning(sb, "Error opening resize inode"); 203119c5246dSYongqiang Yang return PTR_ERR(resize_inode); 203219c5246dSYongqiang Yang } 20331c6bd717STheodore Ts'o } 20341c6bd717STheodore Ts'o 203559e31c15STheodore Ts'o if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { 20361c6bd717STheodore Ts'o err = ext4_convert_meta_bg(sb, resize_inode); 20371c6bd717STheodore Ts'o if (err) 20381c6bd717STheodore Ts'o goto out; 20391c6bd717STheodore Ts'o if (resize_inode) { 20401c6bd717STheodore Ts'o iput(resize_inode); 20411c6bd717STheodore Ts'o resize_inode = NULL; 20421c6bd717STheodore Ts'o } 20431c6bd717STheodore Ts'o if (n_blocks_count_retry) { 20441c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 20451c6bd717STheodore Ts'o n_blocks_count_retry = 0; 20461c6bd717STheodore Ts'o goto retry; 20471c6bd717STheodore Ts'o } 204801f795f9SYongqiang Yang } 204919c5246dSYongqiang Yang 2050f0a459deSTheodore Ts'o /* 2051f0a459deSTheodore Ts'o * Make sure the last group has enough space so that it's 2052f0a459deSTheodore Ts'o * guaranteed to have enough space for all metadata blocks 2053f0a459deSTheodore Ts'o * that it might need to hold. (We might not need to store 2054f0a459deSTheodore Ts'o * the inode table blocks in the last block group, but there 2055f0a459deSTheodore Ts'o * will be cases where this might be needed.) 2056f0a459deSTheodore Ts'o */ 2057f0a459deSTheodore Ts'o if ((ext4_group_first_block_no(sb, n_group) + 2058f0a459deSTheodore Ts'o ext4_group_overhead_blocks(sb, n_group) + 2 + 2059f0a459deSTheodore Ts'o sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { 2060f0a459deSTheodore Ts'o n_blocks_count = ext4_group_first_block_no(sb, n_group); 2061f0a459deSTheodore Ts'o n_group--; 2062f0a459deSTheodore Ts'o n_blocks_count_retry = 0; 2063f0a459deSTheodore Ts'o if (resize_inode) { 2064f0a459deSTheodore Ts'o iput(resize_inode); 2065f0a459deSTheodore Ts'o resize_inode = NULL; 2066f0a459deSTheodore Ts'o } 2067f0a459deSTheodore Ts'o goto retry; 2068f0a459deSTheodore Ts'o } 2069f0a459deSTheodore Ts'o 207019c5246dSYongqiang Yang /* extend the last group */ 2071a0ade1deSLukas Czerner if (n_group == o_group) 2072a0ade1deSLukas Czerner add = n_blocks_count - o_blocks_count; 2073a0ade1deSLukas Czerner else 2074d77147ffSharshads add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); 2075a0ade1deSLukas Czerner if (add > 0) { 207619c5246dSYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 207719c5246dSYongqiang Yang if (err) 207819c5246dSYongqiang Yang goto out; 207919c5246dSYongqiang Yang } 208019c5246dSYongqiang Yang 2081d7574ad0SYongqiang Yang if (ext4_blocks_count(es) == n_blocks_count) 208219c5246dSYongqiang Yang goto out; 208319c5246dSYongqiang Yang 2084117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, n_group + 1); 2085117fff10STheodore Ts'o if (err) 2086f348e224SVasily Averin goto out; 2087117fff10STheodore Ts'o 208828623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, n_group + 1); 208928623c2fSTheodore Ts'o if (err) 209028623c2fSTheodore Ts'o goto out; 209128623c2fSTheodore Ts'o 209219c5246dSYongqiang Yang flex_gd = alloc_flex_gd(flexbg_size); 209319c5246dSYongqiang Yang if (flex_gd == NULL) { 209419c5246dSYongqiang Yang err = -ENOMEM; 209519c5246dSYongqiang Yang goto out; 209619c5246dSYongqiang Yang } 209719c5246dSYongqiang Yang 209819c5246dSYongqiang Yang /* Add flex groups. Note that a regular group is a 209919c5246dSYongqiang Yang * flex group with 1 group. 210019c5246dSYongqiang Yang */ 210119c5246dSYongqiang Yang while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, 210219c5246dSYongqiang Yang flexbg_size)) { 21034da4a56eSTheodore Ts'o if (jiffies - last_update_time > HZ * 10) { 21044da4a56eSTheodore Ts'o if (last_update_time) 21054da4a56eSTheodore Ts'o ext4_msg(sb, KERN_INFO, 21064da4a56eSTheodore Ts'o "resized to %llu blocks", 21074da4a56eSTheodore Ts'o ext4_blocks_count(es)); 21084da4a56eSTheodore Ts'o last_update_time = jiffies; 21094da4a56eSTheodore Ts'o } 211003c1c290SYongqiang Yang if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) 211103c1c290SYongqiang Yang break; 211219c5246dSYongqiang Yang err = ext4_flex_group_add(sb, resize_inode, flex_gd); 211319c5246dSYongqiang Yang if (unlikely(err)) 211419c5246dSYongqiang Yang break; 211519c5246dSYongqiang Yang } 211619c5246dSYongqiang Yang 21171c6bd717STheodore Ts'o if (!err && n_blocks_count_retry) { 21181c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 21191c6bd717STheodore Ts'o n_blocks_count_retry = 0; 21201c6bd717STheodore Ts'o free_flex_gd(flex_gd); 21211c6bd717STheodore Ts'o flex_gd = NULL; 2122db6aee62SVasily Averin if (resize_inode) { 2123db6aee62SVasily Averin iput(resize_inode); 2124db6aee62SVasily Averin resize_inode = NULL; 2125db6aee62SVasily Averin } 21261c6bd717STheodore Ts'o goto retry; 21271c6bd717STheodore Ts'o } 21281c6bd717STheodore Ts'o 212919c5246dSYongqiang Yang out: 213019c5246dSYongqiang Yang if (flex_gd) 213119c5246dSYongqiang Yang free_flex_gd(flex_gd); 213201f795f9SYongqiang Yang if (resize_inode != NULL) 213319c5246dSYongqiang Yang iput(resize_inode); 21346c732840SLukas Czerner if (err) 21356c732840SLukas Czerner ext4_warning(sb, "error (%d) occurred during " 21366c732840SLukas Czerner "file system resize", err); 21376c732840SLukas Czerner ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", 21386c732840SLukas Czerner ext4_blocks_count(es)); 213919c5246dSYongqiang Yang return err; 214019c5246dSYongqiang Yang } 2141