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 779549a168STheodore Ts'o if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 789549a168STheodore Ts'o &EXT4_SB(sb)->s_ext4_flags)) 798f82f840SYongqiang Yang ret = -EBUSY; 808f82f840SYongqiang Yang 818f82f840SYongqiang Yang return ret; 828f82f840SYongqiang Yang } 838f82f840SYongqiang Yang 848f82f840SYongqiang Yang void ext4_resize_end(struct super_block *sb) 858f82f840SYongqiang Yang { 869549a168STheodore Ts'o clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); 874e857c58SPeter Zijlstra smp_mb__after_atomic(); 888f82f840SYongqiang Yang } 898f82f840SYongqiang Yang 9001f795f9SYongqiang Yang static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, 9101f795f9SYongqiang Yang ext4_group_t group) { 9201f795f9SYongqiang Yang return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << 9301f795f9SYongqiang Yang EXT4_DESC_PER_BLOCK_BITS(sb); 9401f795f9SYongqiang Yang } 9501f795f9SYongqiang Yang 9601f795f9SYongqiang Yang static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, 9701f795f9SYongqiang Yang ext4_group_t group) { 9801f795f9SYongqiang Yang group = ext4_meta_bg_first_group(sb, group); 9901f795f9SYongqiang Yang return ext4_group_first_block_no(sb, group); 10001f795f9SYongqiang Yang } 10101f795f9SYongqiang Yang 10201f795f9SYongqiang Yang static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, 10301f795f9SYongqiang Yang ext4_group_t group) { 10401f795f9SYongqiang Yang ext4_grpblk_t overhead; 10501f795f9SYongqiang Yang overhead = ext4_bg_num_gdb(sb, group); 10601f795f9SYongqiang Yang if (ext4_bg_has_super(sb, group)) 10701f795f9SYongqiang Yang overhead += 1 + 10801f795f9SYongqiang Yang le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 10901f795f9SYongqiang Yang return overhead; 11001f795f9SYongqiang Yang } 11101f795f9SYongqiang Yang 112ac27a0ecSDave Kleikamp #define outside(b, first, last) ((b) < (first) || (b) >= (last)) 113ac27a0ecSDave Kleikamp #define inside(b, first, last) ((b) >= (first) && (b) < (last)) 114ac27a0ecSDave Kleikamp 115ac27a0ecSDave Kleikamp static int verify_group_input(struct super_block *sb, 116617ba13bSMingming Cao struct ext4_new_group_data *input) 117ac27a0ecSDave Kleikamp { 118617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 119617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 120bd81d8eeSLaurent Vivier ext4_fsblk_t start = ext4_blocks_count(es); 121617ba13bSMingming Cao ext4_fsblk_t end = start + input->blocks_count; 122fd2d4291SAvantika Mathur ext4_group_t group = input->group; 123617ba13bSMingming Cao ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; 124b302ef2dSTheodore Ts'o unsigned overhead; 125b302ef2dSTheodore Ts'o ext4_fsblk_t metaend; 126ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1273a5b2ecdSMingming Cao ext4_grpblk_t free_blocks_count, offset; 128ac27a0ecSDave Kleikamp int err = -EINVAL; 129ac27a0ecSDave Kleikamp 130b302ef2dSTheodore Ts'o if (group != sbi->s_groups_count) { 131b302ef2dSTheodore Ts'o ext4_warning(sb, "Cannot add at group %u (only %u groups)", 132b302ef2dSTheodore Ts'o input->group, sbi->s_groups_count); 133b302ef2dSTheodore Ts'o return -EINVAL; 134b302ef2dSTheodore Ts'o } 135b302ef2dSTheodore Ts'o 136b302ef2dSTheodore Ts'o overhead = ext4_group_overhead_blocks(sb, group); 137b302ef2dSTheodore Ts'o metaend = start + overhead; 138d77147ffSharshads input->free_clusters_count = free_blocks_count = 139ac27a0ecSDave Kleikamp input->blocks_count - 2 - overhead - sbi->s_itb_per_group; 140ac27a0ecSDave Kleikamp 141ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 142617ba13bSMingming Cao printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " 143ac27a0ecSDave Kleikamp "(%d free, %u reserved)\n", 144617ba13bSMingming Cao ext4_bg_has_super(sb, input->group) ? "normal" : 145ac27a0ecSDave Kleikamp "no-super", input->group, input->blocks_count, 146ac27a0ecSDave Kleikamp free_blocks_count, input->reserved_blocks); 147ac27a0ecSDave Kleikamp 1483a5b2ecdSMingming Cao ext4_get_group_no_and_offset(sb, start, NULL, &offset); 149b302ef2dSTheodore Ts'o if (offset != 0) 15012062dddSEric Sandeen ext4_warning(sb, "Last group not full"); 151ac27a0ecSDave Kleikamp else if (input->reserved_blocks > input->blocks_count / 5) 15212062dddSEric Sandeen ext4_warning(sb, "Reserved blocks too high (%u)", 153ac27a0ecSDave Kleikamp input->reserved_blocks); 154ac27a0ecSDave Kleikamp else if (free_blocks_count < 0) 15512062dddSEric Sandeen ext4_warning(sb, "Bad blocks count %u", 156ac27a0ecSDave Kleikamp input->blocks_count); 157fb265c9cSTheodore Ts'o else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { 158fb265c9cSTheodore Ts'o err = PTR_ERR(bh); 159fb265c9cSTheodore Ts'o bh = NULL; 16012062dddSEric Sandeen ext4_warning(sb, "Cannot read last block (%llu)", 161ac27a0ecSDave Kleikamp end - 1); 162fb265c9cSTheodore Ts'o } else if (outside(input->block_bitmap, start, end)) 16312062dddSEric Sandeen ext4_warning(sb, "Block bitmap not in group (block %llu)", 1641939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 165ac27a0ecSDave Kleikamp else if (outside(input->inode_bitmap, start, end)) 16612062dddSEric Sandeen ext4_warning(sb, "Inode bitmap not in group (block %llu)", 1671939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap); 168ac27a0ecSDave Kleikamp else if (outside(input->inode_table, start, end) || 169ac27a0ecSDave Kleikamp outside(itend - 1, start, end)) 17012062dddSEric Sandeen ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", 1711939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 172ac27a0ecSDave Kleikamp else if (input->inode_bitmap == input->block_bitmap) 17312062dddSEric Sandeen ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", 1741939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 175ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, input->inode_table, itend)) 17612062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in inode table " 17712062dddSEric Sandeen "(%llu-%llu)", 1781939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1791939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 180ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, input->inode_table, itend)) 18112062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in inode table " 18212062dddSEric Sandeen "(%llu-%llu)", 1831939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1841939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 185ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, start, metaend)) 18612062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", 1871939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1881939e49aSRandy Dunlap start, metaend - 1); 189ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, start, metaend)) 19012062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", 1911939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1921939e49aSRandy Dunlap start, metaend - 1); 193ac27a0ecSDave Kleikamp else if (inside(input->inode_table, start, metaend) || 194ac27a0ecSDave Kleikamp inside(itend - 1, start, metaend)) 19512062dddSEric Sandeen ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " 19612062dddSEric Sandeen "(%llu-%llu)", 1971939e49aSRandy Dunlap (unsigned long long)input->inode_table, 1981939e49aSRandy Dunlap itend - 1, start, metaend - 1); 199ac27a0ecSDave Kleikamp else 200ac27a0ecSDave Kleikamp err = 0; 201ac27a0ecSDave Kleikamp brelse(bh); 202ac27a0ecSDave Kleikamp 203ac27a0ecSDave Kleikamp return err; 204ac27a0ecSDave Kleikamp } 205ac27a0ecSDave Kleikamp 20628c7bac0SYongqiang Yang /* 20728c7bac0SYongqiang Yang * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex 20828c7bac0SYongqiang Yang * group each time. 20928c7bac0SYongqiang Yang */ 21028c7bac0SYongqiang Yang struct ext4_new_flex_group_data { 21128c7bac0SYongqiang Yang struct ext4_new_group_data *groups; /* new_group_data for groups 21228c7bac0SYongqiang Yang in the flex group */ 21328c7bac0SYongqiang Yang __u16 *bg_flags; /* block group flags of groups 21428c7bac0SYongqiang Yang in @groups */ 21528c7bac0SYongqiang Yang ext4_group_t count; /* number of groups in @groups 21628c7bac0SYongqiang Yang */ 21728c7bac0SYongqiang Yang }; 21828c7bac0SYongqiang Yang 21928c7bac0SYongqiang Yang /* 22028c7bac0SYongqiang Yang * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of 22128c7bac0SYongqiang Yang * @flexbg_size. 22228c7bac0SYongqiang Yang * 22328c7bac0SYongqiang Yang * Returns NULL on failure otherwise address of the allocated structure. 22428c7bac0SYongqiang Yang */ 22528c7bac0SYongqiang Yang static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) 22628c7bac0SYongqiang Yang { 22728c7bac0SYongqiang Yang struct ext4_new_flex_group_data *flex_gd; 22828c7bac0SYongqiang Yang 22928c7bac0SYongqiang Yang flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); 23028c7bac0SYongqiang Yang if (flex_gd == NULL) 23128c7bac0SYongqiang Yang goto out3; 23228c7bac0SYongqiang Yang 23346901760SInsu Yun if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) 234967ac8afSHaogang Chen goto out2; 23528c7bac0SYongqiang Yang flex_gd->count = flexbg_size; 23628c7bac0SYongqiang Yang 2376da2ec56SKees Cook flex_gd->groups = kmalloc_array(flexbg_size, 2386da2ec56SKees Cook sizeof(struct ext4_new_group_data), 2396da2ec56SKees Cook GFP_NOFS); 24028c7bac0SYongqiang Yang if (flex_gd->groups == NULL) 24128c7bac0SYongqiang Yang goto out2; 24228c7bac0SYongqiang Yang 2436da2ec56SKees Cook flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), 2446da2ec56SKees Cook GFP_NOFS); 24528c7bac0SYongqiang Yang if (flex_gd->bg_flags == NULL) 24628c7bac0SYongqiang Yang goto out1; 24728c7bac0SYongqiang Yang 24828c7bac0SYongqiang Yang return flex_gd; 24928c7bac0SYongqiang Yang 25028c7bac0SYongqiang Yang out1: 25128c7bac0SYongqiang Yang kfree(flex_gd->groups); 25228c7bac0SYongqiang Yang out2: 25328c7bac0SYongqiang Yang kfree(flex_gd); 25428c7bac0SYongqiang Yang out3: 25528c7bac0SYongqiang Yang return NULL; 25628c7bac0SYongqiang Yang } 25728c7bac0SYongqiang Yang 25828c7bac0SYongqiang Yang static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) 25928c7bac0SYongqiang Yang { 26028c7bac0SYongqiang Yang kfree(flex_gd->bg_flags); 26128c7bac0SYongqiang Yang kfree(flex_gd->groups); 26228c7bac0SYongqiang Yang kfree(flex_gd); 26328c7bac0SYongqiang Yang } 26428c7bac0SYongqiang Yang 2653fbea4b3SYongqiang Yang /* 2663fbea4b3SYongqiang Yang * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps 2673fbea4b3SYongqiang Yang * and inode tables for a flex group. 2683fbea4b3SYongqiang Yang * 2693fbea4b3SYongqiang Yang * This function is used by 64bit-resize. Note that this function allocates 2703fbea4b3SYongqiang Yang * group tables from the 1st group of groups contained by @flexgd, which may 2713fbea4b3SYongqiang Yang * be a partial of a flex group. 2723fbea4b3SYongqiang Yang * 2733fbea4b3SYongqiang Yang * @sb: super block of fs to which the groups belongs 27403c1c290SYongqiang Yang * 27503c1c290SYongqiang Yang * Returns 0 on a successful allocation of the metadata blocks in the 27603c1c290SYongqiang Yang * block group. 2773fbea4b3SYongqiang Yang */ 27803c1c290SYongqiang Yang static int ext4_alloc_group_tables(struct super_block *sb, 2793fbea4b3SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 2803fbea4b3SYongqiang Yang int flexbg_size) 2813fbea4b3SYongqiang Yang { 2823fbea4b3SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 2833fbea4b3SYongqiang Yang ext4_fsblk_t start_blk; 2843fbea4b3SYongqiang Yang ext4_fsblk_t last_blk; 2853fbea4b3SYongqiang Yang ext4_group_t src_group; 2863fbea4b3SYongqiang Yang ext4_group_t bb_index = 0; 2873fbea4b3SYongqiang Yang ext4_group_t ib_index = 0; 2883fbea4b3SYongqiang Yang ext4_group_t it_index = 0; 2893fbea4b3SYongqiang Yang ext4_group_t group; 2903fbea4b3SYongqiang Yang ext4_group_t last_group; 2913fbea4b3SYongqiang Yang unsigned overhead; 292b93c9535STheodore Ts'o __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; 293d77147ffSharshads int i; 2943fbea4b3SYongqiang Yang 2953fbea4b3SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 2963fbea4b3SYongqiang Yang 2973fbea4b3SYongqiang Yang src_group = group_data[0].group; 2983fbea4b3SYongqiang Yang last_group = src_group + flex_gd->count - 1; 2993fbea4b3SYongqiang Yang 3003fbea4b3SYongqiang Yang BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != 3013fbea4b3SYongqiang Yang (last_group & ~(flexbg_size - 1)))); 3023fbea4b3SYongqiang Yang next_group: 3033fbea4b3SYongqiang Yang group = group_data[0].group; 30403c1c290SYongqiang Yang if (src_group >= group_data[0].group + flex_gd->count) 30503c1c290SYongqiang Yang return -ENOSPC; 3063fbea4b3SYongqiang Yang start_blk = ext4_group_first_block_no(sb, src_group); 3073fbea4b3SYongqiang Yang last_blk = start_blk + group_data[src_group - group].blocks_count; 3083fbea4b3SYongqiang Yang 30901f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 3103fbea4b3SYongqiang Yang 3113fbea4b3SYongqiang Yang start_blk += overhead; 3123fbea4b3SYongqiang Yang 3133fbea4b3SYongqiang Yang /* We collect contiguous blocks as much as possible. */ 3143fbea4b3SYongqiang Yang src_group++; 31501f795f9SYongqiang Yang for (; src_group <= last_group; src_group++) { 31601f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, src_group); 317b93c9535STheodore Ts'o if (overhead == 0) 3183fbea4b3SYongqiang Yang last_blk += group_data[src_group - group].blocks_count; 3193fbea4b3SYongqiang Yang else 3203fbea4b3SYongqiang Yang break; 32101f795f9SYongqiang Yang } 3223fbea4b3SYongqiang Yang 3233fbea4b3SYongqiang Yang /* Allocate block bitmaps */ 3243fbea4b3SYongqiang Yang for (; bb_index < flex_gd->count; bb_index++) { 3253fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3263fbea4b3SYongqiang Yang goto next_group; 3273fbea4b3SYongqiang Yang group_data[bb_index].block_bitmap = start_blk++; 328bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3293fbea4b3SYongqiang Yang group -= group_data[0].group; 330d77147ffSharshads group_data[group].mdata_blocks++; 331b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3323fbea4b3SYongqiang Yang } 3333fbea4b3SYongqiang Yang 3343fbea4b3SYongqiang Yang /* Allocate inode bitmaps */ 3353fbea4b3SYongqiang Yang for (; ib_index < flex_gd->count; ib_index++) { 3363fbea4b3SYongqiang Yang if (start_blk >= last_blk) 3373fbea4b3SYongqiang Yang goto next_group; 3383fbea4b3SYongqiang Yang group_data[ib_index].inode_bitmap = start_blk++; 339bd86298eSLukas Czerner group = ext4_get_group_number(sb, start_blk - 1); 3403fbea4b3SYongqiang Yang group -= group_data[0].group; 341d77147ffSharshads group_data[group].mdata_blocks++; 342b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3433fbea4b3SYongqiang Yang } 3443fbea4b3SYongqiang Yang 3453fbea4b3SYongqiang Yang /* Allocate inode tables */ 3463fbea4b3SYongqiang Yang for (; it_index < flex_gd->count; it_index++) { 347b93c9535STheodore Ts'o unsigned int itb = EXT4_SB(sb)->s_itb_per_group; 348b93c9535STheodore Ts'o ext4_fsblk_t next_group_start; 349b93c9535STheodore Ts'o 350b93c9535STheodore Ts'o if (start_blk + itb > last_blk) 3513fbea4b3SYongqiang Yang goto next_group; 3523fbea4b3SYongqiang Yang group_data[it_index].inode_table = start_blk; 353b93c9535STheodore Ts'o group = ext4_get_group_number(sb, start_blk); 354b93c9535STheodore Ts'o next_group_start = ext4_group_first_block_no(sb, group + 1); 3553fbea4b3SYongqiang Yang group -= group_data[0].group; 3563fbea4b3SYongqiang Yang 357b93c9535STheodore Ts'o if (start_blk + itb > next_group_start) { 358b93c9535STheodore Ts'o flex_gd->bg_flags[group + 1] &= uninit_mask; 359b93c9535STheodore Ts'o overhead = start_blk + itb - next_group_start; 360d77147ffSharshads group_data[group + 1].mdata_blocks += overhead; 361b93c9535STheodore Ts'o itb -= overhead; 362b93c9535STheodore Ts'o } 363b93c9535STheodore Ts'o 364d77147ffSharshads group_data[group].mdata_blocks += itb; 365b93c9535STheodore Ts'o flex_gd->bg_flags[group] &= uninit_mask; 3663fbea4b3SYongqiang Yang start_blk += EXT4_SB(sb)->s_itb_per_group; 3673fbea4b3SYongqiang Yang } 3683fbea4b3SYongqiang Yang 369d77147ffSharshads /* Update free clusters count to exclude metadata blocks */ 370d77147ffSharshads for (i = 0; i < flex_gd->count; i++) { 371d77147ffSharshads group_data[i].free_clusters_count -= 372d77147ffSharshads EXT4_NUM_B2C(EXT4_SB(sb), 373d77147ffSharshads group_data[i].mdata_blocks); 374d77147ffSharshads } 375d77147ffSharshads 3763fbea4b3SYongqiang Yang if (test_opt(sb, DEBUG)) { 3773fbea4b3SYongqiang Yang int i; 3783fbea4b3SYongqiang Yang group = group_data[0].group; 3793fbea4b3SYongqiang Yang 3803fbea4b3SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: adding a flex group with " 3813fbea4b3SYongqiang Yang "%d groups, flexbg size is %d:\n", flex_gd->count, 3823fbea4b3SYongqiang Yang flexbg_size); 3833fbea4b3SYongqiang Yang 3843fbea4b3SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 385d77147ffSharshads ext4_debug( 386d77147ffSharshads "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", 3873fbea4b3SYongqiang Yang ext4_bg_has_super(sb, group + i) ? "normal" : 3883fbea4b3SYongqiang Yang "no-super", group + i, 3893fbea4b3SYongqiang Yang group_data[i].blocks_count, 390d77147ffSharshads group_data[i].free_clusters_count, 391d77147ffSharshads group_data[i].mdata_blocks); 3923fbea4b3SYongqiang Yang } 3933fbea4b3SYongqiang Yang } 39403c1c290SYongqiang Yang return 0; 3953fbea4b3SYongqiang Yang } 3963fbea4b3SYongqiang Yang 397ac27a0ecSDave Kleikamp static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, 398617ba13bSMingming Cao ext4_fsblk_t blk) 399ac27a0ecSDave Kleikamp { 400ac27a0ecSDave Kleikamp struct buffer_head *bh; 401ac27a0ecSDave Kleikamp int err; 402ac27a0ecSDave Kleikamp 403ac27a0ecSDave Kleikamp bh = sb_getblk(sb, blk); 404aebf0243SWang Shilong if (unlikely(!bh)) 405860d21e2STheodore Ts'o return ERR_PTR(-ENOMEM); 4065d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 407617ba13bSMingming Cao if ((err = ext4_journal_get_write_access(handle, bh))) { 408ac27a0ecSDave Kleikamp brelse(bh); 409ac27a0ecSDave Kleikamp bh = ERR_PTR(err); 410ac27a0ecSDave Kleikamp } else { 411ac27a0ecSDave Kleikamp memset(bh->b_data, 0, sb->s_blocksize); 412ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 413ac27a0ecSDave Kleikamp } 414ac27a0ecSDave Kleikamp 415ac27a0ecSDave Kleikamp return bh; 416ac27a0ecSDave Kleikamp } 417ac27a0ecSDave Kleikamp 41883448bdfSJan Kara static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits) 41983448bdfSJan Kara { 42083448bdfSJan Kara return ext4_journal_ensure_credits_fn(handle, credits, 42183448bdfSJan Kara EXT4_MAX_TRANS_DATA, 0, 0); 42283448bdfSJan Kara } 42383448bdfSJan Kara 424ac27a0ecSDave Kleikamp /* 425d77147ffSharshads * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. 42633afdcc5SYongqiang Yang * 42733afdcc5SYongqiang Yang * Helper function for ext4_setup_new_group_blocks() which set . 42833afdcc5SYongqiang Yang * 42933afdcc5SYongqiang Yang * @sb: super block 43033afdcc5SYongqiang Yang * @handle: journal handle 43133afdcc5SYongqiang Yang * @flex_gd: flex group data 43233afdcc5SYongqiang Yang */ 43333afdcc5SYongqiang Yang static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, 43433afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 435d77147ffSharshads ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) 43633afdcc5SYongqiang Yang { 437d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 438d77147ffSharshads ext4_group_t count = last_cluster - first_cluster + 1; 43933afdcc5SYongqiang Yang ext4_group_t count2; 44033afdcc5SYongqiang Yang 441d77147ffSharshads ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, 442d77147ffSharshads last_cluster); 443d77147ffSharshads for (count2 = count; count > 0; 444d77147ffSharshads count -= count2, first_cluster += count2) { 44533afdcc5SYongqiang Yang ext4_fsblk_t start; 44633afdcc5SYongqiang Yang struct buffer_head *bh; 44733afdcc5SYongqiang Yang ext4_group_t group; 44833afdcc5SYongqiang Yang int err; 44933afdcc5SYongqiang Yang 450d77147ffSharshads group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); 451d77147ffSharshads start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); 45233afdcc5SYongqiang Yang group -= flex_gd->groups[0].group; 45333afdcc5SYongqiang Yang 454d77147ffSharshads count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); 45533afdcc5SYongqiang Yang if (count2 > count) 45633afdcc5SYongqiang Yang count2 = count; 45733afdcc5SYongqiang Yang 45833afdcc5SYongqiang Yang if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { 45933afdcc5SYongqiang Yang BUG_ON(flex_gd->count > 1); 46033afdcc5SYongqiang Yang continue; 46133afdcc5SYongqiang Yang } 46233afdcc5SYongqiang Yang 46383448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 464a4130367SJan Kara if (err < 0) 46533afdcc5SYongqiang Yang return err; 46633afdcc5SYongqiang Yang 46733afdcc5SYongqiang Yang bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); 468aebf0243SWang Shilong if (unlikely(!bh)) 469860d21e2STheodore Ts'o return -ENOMEM; 47033afdcc5SYongqiang Yang 4715d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 47233afdcc5SYongqiang Yang err = ext4_journal_get_write_access(handle, bh); 473cea57941SVasily Averin if (err) { 474cea57941SVasily Averin brelse(bh); 47533afdcc5SYongqiang Yang return err; 476cea57941SVasily Averin } 477d77147ffSharshads ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", 478d77147ffSharshads first_cluster, first_cluster - start, count2); 479d77147ffSharshads ext4_set_bits(bh->b_data, first_cluster - start, count2); 48033afdcc5SYongqiang Yang 48133afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 482cea57941SVasily Averin brelse(bh); 48333afdcc5SYongqiang Yang if (unlikely(err)) 48433afdcc5SYongqiang Yang return err; 48533afdcc5SYongqiang Yang } 48633afdcc5SYongqiang Yang 48733afdcc5SYongqiang Yang return 0; 48833afdcc5SYongqiang Yang } 48933afdcc5SYongqiang Yang 49033afdcc5SYongqiang Yang /* 49133afdcc5SYongqiang Yang * Set up the block and inode bitmaps, and the inode table for the new groups. 49233afdcc5SYongqiang Yang * This doesn't need to be part of the main transaction, since we are only 49333afdcc5SYongqiang Yang * changing blocks outside the actual filesystem. We still do journaling to 49433afdcc5SYongqiang Yang * ensure the recovery is correct in case of a failure just after resize. 49533afdcc5SYongqiang Yang * If any part of this fails, we simply abort the resize. 49633afdcc5SYongqiang Yang * 49733afdcc5SYongqiang Yang * setup_new_flex_group_blocks handles a flex group as follow: 49833afdcc5SYongqiang Yang * 1. copy super block and GDT, and initialize group tables if necessary. 49933afdcc5SYongqiang Yang * In this step, we only set bits in blocks bitmaps for blocks taken by 50033afdcc5SYongqiang Yang * super block and GDT. 50133afdcc5SYongqiang Yang * 2. allocate group tables in block bitmaps, that is, set bits in block 50233afdcc5SYongqiang Yang * bitmap for blocks taken by group tables. 50333afdcc5SYongqiang Yang */ 50433afdcc5SYongqiang Yang static int setup_new_flex_group_blocks(struct super_block *sb, 50533afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 50633afdcc5SYongqiang Yang { 50733afdcc5SYongqiang Yang int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; 50833afdcc5SYongqiang Yang ext4_fsblk_t start; 50933afdcc5SYongqiang Yang ext4_fsblk_t block; 51033afdcc5SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 51133afdcc5SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 51233afdcc5SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 51333afdcc5SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 51433afdcc5SYongqiang Yang handle_t *handle; 51533afdcc5SYongqiang Yang ext4_group_t group, count; 51633afdcc5SYongqiang Yang struct buffer_head *bh = NULL; 51733afdcc5SYongqiang Yang int reserved_gdb, i, j, err = 0, err2; 51801f795f9SYongqiang Yang int meta_bg; 51933afdcc5SYongqiang Yang 52033afdcc5SYongqiang Yang BUG_ON(!flex_gd->count || !group_data || 52133afdcc5SYongqiang Yang group_data[0].group != sbi->s_groups_count); 52233afdcc5SYongqiang Yang 52333afdcc5SYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 524e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 52533afdcc5SYongqiang Yang 52633afdcc5SYongqiang Yang /* This transaction may be extended/restarted along the way */ 5279924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 52833afdcc5SYongqiang Yang if (IS_ERR(handle)) 52933afdcc5SYongqiang Yang return PTR_ERR(handle); 53033afdcc5SYongqiang Yang 53133afdcc5SYongqiang Yang group = group_data[0].group; 53233afdcc5SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group++) { 53333afdcc5SYongqiang Yang unsigned long gdblocks; 53401f795f9SYongqiang Yang ext4_grpblk_t overhead; 53533afdcc5SYongqiang Yang 53633afdcc5SYongqiang Yang gdblocks = ext4_bg_num_gdb(sb, group); 53733afdcc5SYongqiang Yang start = ext4_group_first_block_no(sb, group); 53833afdcc5SYongqiang Yang 53901f795f9SYongqiang Yang if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) 5406df935adSYongqiang Yang goto handle_itb; 5416df935adSYongqiang Yang 54201f795f9SYongqiang Yang if (meta_bg == 1) { 54301f795f9SYongqiang Yang ext4_group_t first_group; 54401f795f9SYongqiang Yang first_group = ext4_meta_bg_first_group(sb, group); 54501f795f9SYongqiang Yang if (first_group != group + 1 && 54601f795f9SYongqiang Yang first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) 54701f795f9SYongqiang Yang goto handle_itb; 54801f795f9SYongqiang Yang } 54901f795f9SYongqiang Yang 55001f795f9SYongqiang Yang block = start + ext4_bg_has_super(sb, group); 55133afdcc5SYongqiang Yang /* Copy all of the GDT blocks into the backup in this group */ 55201f795f9SYongqiang Yang for (j = 0; j < gdblocks; j++, block++) { 55333afdcc5SYongqiang Yang struct buffer_head *gdb; 55433afdcc5SYongqiang Yang 55533afdcc5SYongqiang Yang ext4_debug("update backup group %#04llx\n", block); 55683448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 557a4130367SJan Kara if (err < 0) 55833afdcc5SYongqiang Yang goto out; 55933afdcc5SYongqiang Yang 56033afdcc5SYongqiang Yang gdb = sb_getblk(sb, block); 561aebf0243SWang Shilong if (unlikely(!gdb)) { 562860d21e2STheodore Ts'o err = -ENOMEM; 56333afdcc5SYongqiang Yang goto out; 56433afdcc5SYongqiang Yang } 56533afdcc5SYongqiang Yang 5665d601255Sliang xie BUFFER_TRACE(gdb, "get_write_access"); 56733afdcc5SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb); 56833afdcc5SYongqiang Yang if (err) { 56933afdcc5SYongqiang Yang brelse(gdb); 57033afdcc5SYongqiang Yang goto out; 57133afdcc5SYongqiang Yang } 5721d0c3924STheodore Ts'o memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, 5731d0c3924STheodore Ts'o s_group_desc, j)->b_data, gdb->b_size); 57433afdcc5SYongqiang Yang set_buffer_uptodate(gdb); 57533afdcc5SYongqiang Yang 57633afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb); 57733afdcc5SYongqiang Yang if (unlikely(err)) { 57833afdcc5SYongqiang Yang brelse(gdb); 57933afdcc5SYongqiang Yang goto out; 58033afdcc5SYongqiang Yang } 58133afdcc5SYongqiang Yang brelse(gdb); 58233afdcc5SYongqiang Yang } 58333afdcc5SYongqiang Yang 58433afdcc5SYongqiang Yang /* Zero out all of the reserved backup group descriptor 58533afdcc5SYongqiang Yang * table blocks 58633afdcc5SYongqiang Yang */ 58733afdcc5SYongqiang Yang if (ext4_bg_has_super(sb, group)) { 58833afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, gdblocks + start + 1, 58933afdcc5SYongqiang Yang reserved_gdb, GFP_NOFS); 59033afdcc5SYongqiang Yang if (err) 59133afdcc5SYongqiang Yang goto out; 59233afdcc5SYongqiang Yang } 59333afdcc5SYongqiang Yang 5946df935adSYongqiang Yang handle_itb: 59533afdcc5SYongqiang Yang /* Initialize group tables of the grop @group */ 59633afdcc5SYongqiang Yang if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) 59733afdcc5SYongqiang Yang goto handle_bb; 59833afdcc5SYongqiang Yang 59933afdcc5SYongqiang Yang /* Zero out all of the inode table blocks */ 60033afdcc5SYongqiang Yang block = group_data[i].inode_table; 60133afdcc5SYongqiang Yang ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", 60233afdcc5SYongqiang Yang block, sbi->s_itb_per_group); 60333afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, 60433afdcc5SYongqiang Yang GFP_NOFS); 60533afdcc5SYongqiang Yang if (err) 60633afdcc5SYongqiang Yang goto out; 60733afdcc5SYongqiang Yang 60833afdcc5SYongqiang Yang handle_bb: 60933afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) 61033afdcc5SYongqiang Yang goto handle_ib; 61133afdcc5SYongqiang Yang 61233afdcc5SYongqiang Yang /* Initialize block bitmap of the @group */ 61333afdcc5SYongqiang Yang block = group_data[i].block_bitmap; 61483448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 615a4130367SJan Kara if (err < 0) 61633afdcc5SYongqiang Yang goto out; 61733afdcc5SYongqiang Yang 61833afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 61933afdcc5SYongqiang Yang if (IS_ERR(bh)) { 62033afdcc5SYongqiang Yang err = PTR_ERR(bh); 62133afdcc5SYongqiang Yang goto out; 62233afdcc5SYongqiang Yang } 62301f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group); 62401f795f9SYongqiang Yang if (overhead != 0) { 62533afdcc5SYongqiang Yang ext4_debug("mark backup superblock %#04llx (+0)\n", 62633afdcc5SYongqiang Yang start); 627d77147ffSharshads ext4_set_bits(bh->b_data, 0, 628d77147ffSharshads EXT4_NUM_B2C(sbi, overhead)); 62933afdcc5SYongqiang Yang } 630d77147ffSharshads ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), 63133afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 63233afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6339e402893SVasily Averin brelse(bh); 63433afdcc5SYongqiang Yang if (err) 63533afdcc5SYongqiang Yang goto out; 63633afdcc5SYongqiang Yang 63733afdcc5SYongqiang Yang handle_ib: 63833afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_INODE_UNINIT) 63933afdcc5SYongqiang Yang continue; 64033afdcc5SYongqiang Yang 64133afdcc5SYongqiang Yang /* Initialize inode bitmap of the @group */ 64233afdcc5SYongqiang Yang block = group_data[i].inode_bitmap; 64383448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 644a4130367SJan Kara if (err < 0) 64533afdcc5SYongqiang Yang goto out; 64633afdcc5SYongqiang Yang /* Mark unused entries in inode bitmap used */ 64733afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 64833afdcc5SYongqiang Yang if (IS_ERR(bh)) { 64933afdcc5SYongqiang Yang err = PTR_ERR(bh); 65033afdcc5SYongqiang Yang goto out; 65133afdcc5SYongqiang Yang } 65233afdcc5SYongqiang Yang 65333afdcc5SYongqiang Yang ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), 65433afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 65533afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 6569e402893SVasily Averin brelse(bh); 65733afdcc5SYongqiang Yang if (err) 65833afdcc5SYongqiang Yang goto out; 65933afdcc5SYongqiang Yang } 66033afdcc5SYongqiang Yang 66133afdcc5SYongqiang Yang /* Mark group tables in block bitmap */ 66233afdcc5SYongqiang Yang for (j = 0; j < GROUP_TABLE_COUNT; j++) { 66333afdcc5SYongqiang Yang count = group_table_count[j]; 66433afdcc5SYongqiang Yang start = (&group_data[0].block_bitmap)[j]; 66533afdcc5SYongqiang Yang block = start; 66633afdcc5SYongqiang Yang for (i = 1; i < flex_gd->count; i++) { 66733afdcc5SYongqiang Yang block += group_table_count[j]; 66833afdcc5SYongqiang Yang if (block == (&group_data[i].block_bitmap)[j]) { 66933afdcc5SYongqiang Yang count += group_table_count[j]; 67033afdcc5SYongqiang Yang continue; 67133afdcc5SYongqiang Yang } 67233afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 673d77147ffSharshads flex_gd, 674d77147ffSharshads EXT4_B2C(sbi, start), 675d77147ffSharshads EXT4_B2C(sbi, 676d77147ffSharshads start + count 677d77147ffSharshads - 1)); 67833afdcc5SYongqiang Yang if (err) 67933afdcc5SYongqiang Yang goto out; 68033afdcc5SYongqiang Yang count = group_table_count[j]; 681b93c9535STheodore Ts'o start = (&group_data[i].block_bitmap)[j]; 68233afdcc5SYongqiang Yang block = start; 68333afdcc5SYongqiang Yang } 68433afdcc5SYongqiang Yang 68533afdcc5SYongqiang Yang if (count) { 68633afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 687d77147ffSharshads flex_gd, 688d77147ffSharshads EXT4_B2C(sbi, start), 689d77147ffSharshads EXT4_B2C(sbi, 690d77147ffSharshads start + count 691d77147ffSharshads - 1)); 69233afdcc5SYongqiang Yang if (err) 69333afdcc5SYongqiang Yang goto out; 69433afdcc5SYongqiang Yang } 69533afdcc5SYongqiang Yang } 69633afdcc5SYongqiang Yang 69733afdcc5SYongqiang Yang out: 69833afdcc5SYongqiang Yang err2 = ext4_journal_stop(handle); 69933afdcc5SYongqiang Yang if (err2 && !err) 70033afdcc5SYongqiang Yang err = err2; 70133afdcc5SYongqiang Yang 70233afdcc5SYongqiang Yang return err; 70333afdcc5SYongqiang Yang } 70433afdcc5SYongqiang Yang 70533afdcc5SYongqiang Yang /* 706ac27a0ecSDave Kleikamp * Iterate through the groups which hold BACKUP superblock/GDT copies in an 707617ba13bSMingming Cao * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before 708ac27a0ecSDave Kleikamp * calling this for the first time. In a sparse filesystem it will be the 709ac27a0ecSDave Kleikamp * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... 710ac27a0ecSDave Kleikamp * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... 711ac27a0ecSDave Kleikamp */ 712617ba13bSMingming Cao static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, 713ac27a0ecSDave Kleikamp unsigned *five, unsigned *seven) 714ac27a0ecSDave Kleikamp { 715ac27a0ecSDave Kleikamp unsigned *min = three; 716ac27a0ecSDave Kleikamp int mult = 3; 717ac27a0ecSDave Kleikamp unsigned ret; 718ac27a0ecSDave Kleikamp 719e2b911c5SDarrick J. Wong if (!ext4_has_feature_sparse_super(sb)) { 720ac27a0ecSDave Kleikamp ret = *min; 721ac27a0ecSDave Kleikamp *min += 1; 722ac27a0ecSDave Kleikamp return ret; 723ac27a0ecSDave Kleikamp } 724ac27a0ecSDave Kleikamp 725ac27a0ecSDave Kleikamp if (*five < *min) { 726ac27a0ecSDave Kleikamp min = five; 727ac27a0ecSDave Kleikamp mult = 5; 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp if (*seven < *min) { 730ac27a0ecSDave Kleikamp min = seven; 731ac27a0ecSDave Kleikamp mult = 7; 732ac27a0ecSDave Kleikamp } 733ac27a0ecSDave Kleikamp 734ac27a0ecSDave Kleikamp ret = *min; 735ac27a0ecSDave Kleikamp *min *= mult; 736ac27a0ecSDave Kleikamp 737ac27a0ecSDave Kleikamp return ret; 738ac27a0ecSDave Kleikamp } 739ac27a0ecSDave Kleikamp 740ac27a0ecSDave Kleikamp /* 741ac27a0ecSDave Kleikamp * Check that all of the backup GDT blocks are held in the primary GDT block. 742ac27a0ecSDave Kleikamp * It is assumed that they are stored in group order. Returns the number of 743ac27a0ecSDave Kleikamp * groups in current filesystem that have BACKUPS, or -ve error code. 744ac27a0ecSDave Kleikamp */ 745ac27a0ecSDave Kleikamp static int verify_reserved_gdb(struct super_block *sb, 746c72df9f9SYongqiang Yang ext4_group_t end, 747ac27a0ecSDave Kleikamp struct buffer_head *primary) 748ac27a0ecSDave Kleikamp { 749617ba13bSMingming Cao const ext4_fsblk_t blk = primary->b_blocknr; 750ac27a0ecSDave Kleikamp unsigned three = 1; 751ac27a0ecSDave Kleikamp unsigned five = 5; 752ac27a0ecSDave Kleikamp unsigned seven = 7; 753ac27a0ecSDave Kleikamp unsigned grp; 754ac27a0ecSDave Kleikamp __le32 *p = (__le32 *)primary->b_data; 755ac27a0ecSDave Kleikamp int gdbackups = 0; 756ac27a0ecSDave Kleikamp 757617ba13bSMingming Cao while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { 758bd81d8eeSLaurent Vivier if (le32_to_cpu(*p++) != 759bd81d8eeSLaurent Vivier grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ 76012062dddSEric Sandeen ext4_warning(sb, "reserved GDT %llu" 7612ae02107SMingming Cao " missing grp %d (%llu)", 762ac27a0ecSDave Kleikamp blk, grp, 763bd81d8eeSLaurent Vivier grp * 764bd81d8eeSLaurent Vivier (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 765bd81d8eeSLaurent Vivier blk); 766ac27a0ecSDave Kleikamp return -EINVAL; 767ac27a0ecSDave Kleikamp } 768617ba13bSMingming Cao if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) 769ac27a0ecSDave Kleikamp return -EFBIG; 770ac27a0ecSDave Kleikamp } 771ac27a0ecSDave Kleikamp 772ac27a0ecSDave Kleikamp return gdbackups; 773ac27a0ecSDave Kleikamp } 774ac27a0ecSDave Kleikamp 775ac27a0ecSDave Kleikamp /* 776ac27a0ecSDave Kleikamp * Called when we need to bring a reserved group descriptor table block into 777ac27a0ecSDave Kleikamp * use from the resize inode. The primary copy of the new GDT block currently 778ac27a0ecSDave Kleikamp * is an indirect block (under the double indirect block in the resize inode). 779ac27a0ecSDave Kleikamp * The new backup GDT blocks will be stored as leaf blocks in this indirect 780ac27a0ecSDave Kleikamp * block, in group order. Even though we know all the block numbers we need, 781ac27a0ecSDave Kleikamp * we check to ensure that the resize inode has actually reserved these blocks. 782ac27a0ecSDave Kleikamp * 783ac27a0ecSDave Kleikamp * Don't need to update the block bitmaps because the blocks are still in use. 784ac27a0ecSDave Kleikamp * 785ac27a0ecSDave Kleikamp * We get all of the error cases out of the way, so that we are sure to not 786ac27a0ecSDave Kleikamp * fail once we start modifying the data on disk, because JBD has no rollback. 787ac27a0ecSDave Kleikamp */ 788ac27a0ecSDave Kleikamp static int add_new_gdb(handle_t *handle, struct inode *inode, 7892f919710SYongqiang Yang ext4_group_t group) 790ac27a0ecSDave Kleikamp { 791ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 792617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 7932f919710SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 794617ba13bSMingming Cao ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; 795fb265c9cSTheodore Ts'o struct buffer_head **o_group_desc, **n_group_desc = NULL; 796fb265c9cSTheodore Ts'o struct buffer_head *dind = NULL; 797fb265c9cSTheodore Ts'o struct buffer_head *gdb_bh = NULL; 798ac27a0ecSDave Kleikamp int gdbackups; 799fb265c9cSTheodore Ts'o struct ext4_iloc iloc = { .bh = NULL }; 800ac27a0ecSDave Kleikamp __le32 *data; 801ac27a0ecSDave Kleikamp int err; 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 804ac27a0ecSDave Kleikamp printk(KERN_DEBUG 805617ba13bSMingming Cao "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", 806ac27a0ecSDave Kleikamp gdb_num); 807ac27a0ecSDave Kleikamp 808fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 809fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 810fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 811ac27a0ecSDave Kleikamp 812c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, gdb_bh); 8132f919710SYongqiang Yang if (gdbackups < 0) { 814ac27a0ecSDave Kleikamp err = gdbackups; 815fb265c9cSTheodore Ts'o goto errout; 816ac27a0ecSDave Kleikamp } 817ac27a0ecSDave Kleikamp 818617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 819fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 820fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 821fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 822fb265c9cSTheodore Ts'o dind = NULL; 823fb265c9cSTheodore Ts'o goto errout; 824ac27a0ecSDave Kleikamp } 825ac27a0ecSDave Kleikamp 826ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 827617ba13bSMingming Cao if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { 82812062dddSEric Sandeen ext4_warning(sb, "new group %u GDT block %llu not reserved", 8292f919710SYongqiang Yang group, gdblock); 830ac27a0ecSDave Kleikamp err = -EINVAL; 831fb265c9cSTheodore Ts'o goto errout; 832ac27a0ecSDave Kleikamp } 833ac27a0ecSDave Kleikamp 8345d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 835b4097142STheodore Ts'o err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); 836b4097142STheodore Ts'o if (unlikely(err)) 837fb265c9cSTheodore Ts'o goto errout; 838ac27a0ecSDave Kleikamp 8395d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 8402f919710SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb_bh); 841b4097142STheodore Ts'o if (unlikely(err)) 842fb265c9cSTheodore Ts'o goto errout; 843ac27a0ecSDave Kleikamp 8445d601255Sliang xie BUFFER_TRACE(dind, "get_write_access"); 845b4097142STheodore Ts'o err = ext4_journal_get_write_access(handle, dind); 846c9e87161SDinghao Liu if (unlikely(err)) { 847b4097142STheodore Ts'o ext4_std_error(sb, err); 848c9e87161SDinghao Liu goto errout; 849c9e87161SDinghao Liu } 850ac27a0ecSDave Kleikamp 851617ba13bSMingming Cao /* ext4_reserve_inode_write() gets a reference on the iloc */ 852b4097142STheodore Ts'o err = ext4_reserve_inode_write(handle, inode, &iloc); 853b4097142STheodore Ts'o if (unlikely(err)) 854fb265c9cSTheodore Ts'o goto errout; 855ac27a0ecSDave Kleikamp 85671b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 85771b565ceSTheodore Ts'o GFP_KERNEL); 858ac27a0ecSDave Kleikamp if (!n_group_desc) { 859ac27a0ecSDave Kleikamp err = -ENOMEM; 860f18a5f21STheodore Ts'o ext4_warning(sb, "not enough memory for %lu groups", 861f18a5f21STheodore Ts'o gdb_num + 1); 862fb265c9cSTheodore Ts'o goto errout; 863ac27a0ecSDave Kleikamp } 864ac27a0ecSDave Kleikamp 865ac27a0ecSDave Kleikamp /* 866ac27a0ecSDave Kleikamp * Finally, we have all of the possible failures behind us... 867ac27a0ecSDave Kleikamp * 868ac27a0ecSDave Kleikamp * Remove new GDT block from inode double-indirect block and clear out 869ac27a0ecSDave Kleikamp * the new GDT block for use (which also "frees" the backup GDT blocks 870ac27a0ecSDave Kleikamp * from the reserved inode). We don't need to change the bitmaps for 871ac27a0ecSDave Kleikamp * these blocks, because they are marked as in-use from being in the 872ac27a0ecSDave Kleikamp * reserved inode, and will become GDT blocks (primary and backup). 873ac27a0ecSDave Kleikamp */ 874617ba13bSMingming Cao data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; 875b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, dind); 876b4097142STheodore Ts'o if (unlikely(err)) { 877b4097142STheodore Ts'o ext4_std_error(sb, err); 878fb265c9cSTheodore Ts'o goto errout; 879b4097142STheodore Ts'o } 880d77147ffSharshads inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 881d77147ffSharshads (9 - EXT4_SB(sb)->s_cluster_bits); 882617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 8832f919710SYongqiang Yang memset(gdb_bh->b_data, 0, sb->s_blocksize); 8842f919710SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 885b4097142STheodore Ts'o if (unlikely(err)) { 886b4097142STheodore Ts'o ext4_std_error(sb, err); 8878c380ab4SPan Bian iloc.bh = NULL; 888fb265c9cSTheodore Ts'o goto errout; 889b4097142STheodore Ts'o } 890b4097142STheodore Ts'o brelse(dind); 891ac27a0ecSDave Kleikamp 8921d0c3924STheodore Ts'o rcu_read_lock(); 8931d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 894ac27a0ecSDave Kleikamp memcpy(n_group_desc, o_group_desc, 895617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 8961d0c3924STheodore Ts'o rcu_read_unlock(); 8972f919710SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 8981d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 899617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count++; 9001d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 901ac27a0ecSDave Kleikamp 902*05c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 903e8546d06SMarcin Slusarz le16_add_cpu(&es->s_reserved_gdt_blocks, -1); 904*05c2c00fSJan Kara ext4_superblock_csum_set(sb); 905*05c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 906b50924c2SArtem Bityutskiy err = ext4_handle_dirty_super(handle, sb); 907b4097142STheodore Ts'o if (err) 908b4097142STheodore Ts'o ext4_std_error(sb, err); 909b4097142STheodore Ts'o return err; 910fb265c9cSTheodore Ts'o errout: 911b93b41d4SAl Viro kvfree(n_group_desc); 912ac27a0ecSDave Kleikamp brelse(iloc.bh); 913ac27a0ecSDave Kleikamp brelse(dind); 9142f919710SYongqiang Yang brelse(gdb_bh); 915ac27a0ecSDave Kleikamp 916617ba13bSMingming Cao ext4_debug("leaving with error %d\n", err); 917ac27a0ecSDave Kleikamp return err; 918ac27a0ecSDave Kleikamp } 919ac27a0ecSDave Kleikamp 920ac27a0ecSDave Kleikamp /* 92101f795f9SYongqiang Yang * add_new_gdb_meta_bg is the sister of add_new_gdb. 92201f795f9SYongqiang Yang */ 92301f795f9SYongqiang Yang static int add_new_gdb_meta_bg(struct super_block *sb, 92401f795f9SYongqiang Yang handle_t *handle, ext4_group_t group) { 92501f795f9SYongqiang Yang ext4_fsblk_t gdblock; 92601f795f9SYongqiang Yang struct buffer_head *gdb_bh; 92701f795f9SYongqiang Yang struct buffer_head **o_group_desc, **n_group_desc; 92801f795f9SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 92901f795f9SYongqiang Yang int err; 93001f795f9SYongqiang Yang 93101f795f9SYongqiang Yang gdblock = ext4_meta_bg_first_block_no(sb, group) + 93201f795f9SYongqiang Yang ext4_bg_has_super(sb, group); 933fb265c9cSTheodore Ts'o gdb_bh = ext4_sb_bread(sb, gdblock, 0); 934fb265c9cSTheodore Ts'o if (IS_ERR(gdb_bh)) 935fb265c9cSTheodore Ts'o return PTR_ERR(gdb_bh); 93671b565ceSTheodore Ts'o n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), 93771b565ceSTheodore Ts'o GFP_KERNEL); 93801f795f9SYongqiang Yang if (!n_group_desc) { 93961a9c11eSVasily Averin brelse(gdb_bh); 94001f795f9SYongqiang Yang err = -ENOMEM; 94101f795f9SYongqiang Yang ext4_warning(sb, "not enough memory for %lu groups", 94201f795f9SYongqiang Yang gdb_num + 1); 94301f795f9SYongqiang Yang return err; 94401f795f9SYongqiang Yang } 94501f795f9SYongqiang Yang 9461d0c3924STheodore Ts'o rcu_read_lock(); 9471d0c3924STheodore Ts'o o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); 94801f795f9SYongqiang Yang memcpy(n_group_desc, o_group_desc, 94901f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 9501d0c3924STheodore Ts'o rcu_read_unlock(); 95101f795f9SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 952d64264d6SLukas Czerner 953d64264d6SLukas Czerner BUFFER_TRACE(gdb_bh, "get_write_access"); 954d64264d6SLukas Czerner err = ext4_journal_get_write_access(handle, gdb_bh); 955d64264d6SLukas Czerner if (err) { 956d64264d6SLukas Czerner kvfree(n_group_desc); 957d64264d6SLukas Czerner brelse(gdb_bh); 958d64264d6SLukas Czerner return err; 959d64264d6SLukas Czerner } 960d64264d6SLukas Czerner 9611d0c3924STheodore Ts'o rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); 96201f795f9SYongqiang Yang EXT4_SB(sb)->s_gdb_count++; 9631d0c3924STheodore Ts'o ext4_kvfree_array_rcu(o_group_desc); 96401f795f9SYongqiang Yang return err; 96501f795f9SYongqiang Yang } 96601f795f9SYongqiang Yang 96701f795f9SYongqiang Yang /* 968ac27a0ecSDave Kleikamp * Called when we are adding a new group which has a backup copy of each of 969ac27a0ecSDave Kleikamp * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. 970ac27a0ecSDave Kleikamp * We need to add these reserved backup GDT blocks to the resize inode, so 971ac27a0ecSDave Kleikamp * that they are kept for future resizing and not allocated to files. 972ac27a0ecSDave Kleikamp * 973ac27a0ecSDave Kleikamp * Each reserved backup GDT block will go into a different indirect block. 974ac27a0ecSDave Kleikamp * The indirect blocks are actually the primary reserved GDT blocks, 975ac27a0ecSDave Kleikamp * so we know in advance what their block numbers are. We only get the 976ac27a0ecSDave Kleikamp * double-indirect block to verify it is pointing to the primary reserved 977ac27a0ecSDave Kleikamp * GDT blocks so we don't overwrite a data block by accident. The reserved 978ac27a0ecSDave Kleikamp * backup GDT blocks are stored in their reserved primary GDT block. 979ac27a0ecSDave Kleikamp */ 980ac27a0ecSDave Kleikamp static int reserve_backup_gdb(handle_t *handle, struct inode *inode, 981668f4dc5SYongqiang Yang ext4_group_t group) 982ac27a0ecSDave Kleikamp { 983ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 984617ba13bSMingming Cao int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 985d77147ffSharshads int cluster_bits = EXT4_SB(sb)->s_cluster_bits; 986ac27a0ecSDave Kleikamp struct buffer_head **primary; 987ac27a0ecSDave Kleikamp struct buffer_head *dind; 988617ba13bSMingming Cao struct ext4_iloc iloc; 989617ba13bSMingming Cao ext4_fsblk_t blk; 990ac27a0ecSDave Kleikamp __le32 *data, *end; 991ac27a0ecSDave Kleikamp int gdbackups = 0; 992ac27a0ecSDave Kleikamp int res, i; 993ac27a0ecSDave Kleikamp int err; 994ac27a0ecSDave Kleikamp 9956da2ec56SKees Cook primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); 996ac27a0ecSDave Kleikamp if (!primary) 997ac27a0ecSDave Kleikamp return -ENOMEM; 998ac27a0ecSDave Kleikamp 999617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 1000fb265c9cSTheodore Ts'o dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); 1001fb265c9cSTheodore Ts'o if (IS_ERR(dind)) { 1002fb265c9cSTheodore Ts'o err = PTR_ERR(dind); 1003fb265c9cSTheodore Ts'o dind = NULL; 1004ac27a0ecSDave Kleikamp goto exit_free; 1005ac27a0ecSDave Kleikamp } 1006ac27a0ecSDave Kleikamp 1007617ba13bSMingming Cao blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; 100894460093SJosef Bacik data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % 100994460093SJosef Bacik EXT4_ADDR_PER_BLOCK(sb)); 1010617ba13bSMingming Cao end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); 1011ac27a0ecSDave Kleikamp 1012ac27a0ecSDave Kleikamp /* Get each reserved primary GDT block and verify it holds backups */ 1013ac27a0ecSDave Kleikamp for (res = 0; res < reserved_gdb; res++, blk++) { 1014ac27a0ecSDave Kleikamp if (le32_to_cpu(*data) != blk) { 101512062dddSEric Sandeen ext4_warning(sb, "reserved block %llu" 1016ac27a0ecSDave Kleikamp " not at offset %ld", 1017ac27a0ecSDave Kleikamp blk, 1018ac27a0ecSDave Kleikamp (long)(data - (__le32 *)dind->b_data)); 1019ac27a0ecSDave Kleikamp err = -EINVAL; 1020ac27a0ecSDave Kleikamp goto exit_bh; 1021ac27a0ecSDave Kleikamp } 1022fb265c9cSTheodore Ts'o primary[res] = ext4_sb_bread(sb, blk, 0); 1023fb265c9cSTheodore Ts'o if (IS_ERR(primary[res])) { 1024fb265c9cSTheodore Ts'o err = PTR_ERR(primary[res]); 1025fb265c9cSTheodore Ts'o primary[res] = NULL; 1026ac27a0ecSDave Kleikamp goto exit_bh; 1027ac27a0ecSDave Kleikamp } 1028c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, primary[res]); 1029c72df9f9SYongqiang Yang if (gdbackups < 0) { 1030ac27a0ecSDave Kleikamp brelse(primary[res]); 1031ac27a0ecSDave Kleikamp err = gdbackups; 1032ac27a0ecSDave Kleikamp goto exit_bh; 1033ac27a0ecSDave Kleikamp } 1034ac27a0ecSDave Kleikamp if (++data >= end) 1035ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 1036ac27a0ecSDave Kleikamp } 1037ac27a0ecSDave Kleikamp 1038ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 10395d601255Sliang xie BUFFER_TRACE(primary[i], "get_write_access"); 104037be2f59SEric Sandeen if ((err = ext4_journal_get_write_access(handle, primary[i]))) 1041ac27a0ecSDave Kleikamp goto exit_bh; 1042ac27a0ecSDave Kleikamp } 1043ac27a0ecSDave Kleikamp 1044617ba13bSMingming Cao if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) 1045ac27a0ecSDave Kleikamp goto exit_bh; 1046ac27a0ecSDave Kleikamp 1047ac27a0ecSDave Kleikamp /* 1048ac27a0ecSDave Kleikamp * Finally we can add each of the reserved backup GDT blocks from 1049ac27a0ecSDave Kleikamp * the new group to its reserved primary GDT block. 1050ac27a0ecSDave Kleikamp */ 1051668f4dc5SYongqiang Yang blk = group * EXT4_BLOCKS_PER_GROUP(sb); 1052ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 1053ac27a0ecSDave Kleikamp int err2; 1054ac27a0ecSDave Kleikamp data = (__le32 *)primary[i]->b_data; 1055ac27a0ecSDave Kleikamp /* printk("reserving backup %lu[%u] = %lu\n", 1056ac27a0ecSDave Kleikamp primary[i]->b_blocknr, gdbackups, 1057ac27a0ecSDave Kleikamp blk + primary[i]->b_blocknr); */ 1058ac27a0ecSDave Kleikamp data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); 10590390131bSFrank Mayhar err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); 1060ac27a0ecSDave Kleikamp if (!err) 1061ac27a0ecSDave Kleikamp err = err2; 1062ac27a0ecSDave Kleikamp } 1063d77147ffSharshads 1064d77147ffSharshads inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); 1065617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 1066ac27a0ecSDave Kleikamp 1067ac27a0ecSDave Kleikamp exit_bh: 1068ac27a0ecSDave Kleikamp while (--res >= 0) 1069ac27a0ecSDave Kleikamp brelse(primary[res]); 1070ac27a0ecSDave Kleikamp brelse(dind); 1071ac27a0ecSDave Kleikamp 1072ac27a0ecSDave Kleikamp exit_free: 1073ac27a0ecSDave Kleikamp kfree(primary); 1074ac27a0ecSDave Kleikamp 1075ac27a0ecSDave Kleikamp return err; 1076ac27a0ecSDave Kleikamp } 1077ac27a0ecSDave Kleikamp 1078ac27a0ecSDave Kleikamp /* 1079617ba13bSMingming Cao * Update the backup copies of the ext4 metadata. These don't need to be part 1080ac27a0ecSDave Kleikamp * of the main resize transaction, because e2fsck will re-write them if there 1081ac27a0ecSDave Kleikamp * is a problem (basically only OOM will cause a problem). However, we 1082ac27a0ecSDave Kleikamp * _should_ update the backups if possible, in case the primary gets trashed 1083ac27a0ecSDave Kleikamp * for some reason and we need to run e2fsck from a backup superblock. The 1084ac27a0ecSDave Kleikamp * important part is that the new block and inode counts are in the backup 1085ac27a0ecSDave Kleikamp * superblocks, and the location of the new group metadata in the GDT backups. 1086ac27a0ecSDave Kleikamp * 108732ed5058STheodore Ts'o * We do not need take the s_resize_lock for this, because these 108832ed5058STheodore Ts'o * blocks are not otherwise touched by the filesystem code when it is 108932ed5058STheodore Ts'o * mounted. We don't need to worry about last changing from 109032ed5058STheodore Ts'o * sbi->s_groups_count, because the worst that can happen is that we 109132ed5058STheodore Ts'o * do not copy the full number of backups at this time. The resize 109232ed5058STheodore Ts'o * which changed s_groups_count will backup again. 1093ac27a0ecSDave Kleikamp */ 1094904dad47SAndy Leiserson static void update_backups(struct super_block *sb, sector_t blk_off, char *data, 109501f795f9SYongqiang Yang int size, int meta_bg) 1096ac27a0ecSDave Kleikamp { 1097617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 109801f795f9SYongqiang Yang ext4_group_t last; 1099617ba13bSMingming Cao const int bpg = EXT4_BLOCKS_PER_GROUP(sb); 1100ac27a0ecSDave Kleikamp unsigned three = 1; 1101ac27a0ecSDave Kleikamp unsigned five = 5; 1102ac27a0ecSDave Kleikamp unsigned seven = 7; 110301f795f9SYongqiang Yang ext4_group_t group = 0; 1104ac27a0ecSDave Kleikamp int rest = sb->s_blocksize - size; 1105ac27a0ecSDave Kleikamp handle_t *handle; 1106ac27a0ecSDave Kleikamp int err = 0, err2; 1107ac27a0ecSDave Kleikamp 11089924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); 1109ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1110ac27a0ecSDave Kleikamp group = 1; 1111ac27a0ecSDave Kleikamp err = PTR_ERR(handle); 1112ac27a0ecSDave Kleikamp goto exit_err; 1113ac27a0ecSDave Kleikamp } 1114ac27a0ecSDave Kleikamp 111501f795f9SYongqiang Yang if (meta_bg == 0) { 111601f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 111701f795f9SYongqiang Yang last = sbi->s_groups_count; 111801f795f9SYongqiang Yang } else { 1119904dad47SAndy Leiserson group = ext4_get_group_number(sb, blk_off) + 1; 112001f795f9SYongqiang Yang last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); 112101f795f9SYongqiang Yang } 112201f795f9SYongqiang Yang 112301f795f9SYongqiang Yang while (group < sbi->s_groups_count) { 1124ac27a0ecSDave Kleikamp struct buffer_head *bh; 112501f795f9SYongqiang Yang ext4_fsblk_t backup_block; 1126ac27a0ecSDave Kleikamp 1127ac27a0ecSDave Kleikamp /* Out of journal space, and can't get more - abort - so sad */ 112883448bdfSJan Kara err = ext4_resize_ensure_credits_batch(handle, 1); 1129a4130367SJan Kara if (err < 0) 1130ac27a0ecSDave Kleikamp break; 1131ac27a0ecSDave Kleikamp 113201f795f9SYongqiang Yang if (meta_bg == 0) 11339378c676SJan Kara backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; 113401f795f9SYongqiang Yang else 113501f795f9SYongqiang Yang backup_block = (ext4_group_first_block_no(sb, group) + 113601f795f9SYongqiang Yang ext4_bg_has_super(sb, group)); 113701f795f9SYongqiang Yang 113801f795f9SYongqiang Yang bh = sb_getblk(sb, backup_block); 1139aebf0243SWang Shilong if (unlikely(!bh)) { 1140860d21e2STheodore Ts'o err = -ENOMEM; 1141ac27a0ecSDave Kleikamp break; 1142ac27a0ecSDave Kleikamp } 114301f795f9SYongqiang Yang ext4_debug("update metadata backup %llu(+%llu)\n", 114401f795f9SYongqiang Yang backup_block, backup_block - 114501f795f9SYongqiang Yang ext4_group_first_block_no(sb, group)); 11465d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1147ea0abbb6SVasily Averin if ((err = ext4_journal_get_write_access(handle, bh))) { 1148ea0abbb6SVasily Averin brelse(bh); 1149ac27a0ecSDave Kleikamp break; 1150ea0abbb6SVasily Averin } 1151ac27a0ecSDave Kleikamp lock_buffer(bh); 1152ac27a0ecSDave Kleikamp memcpy(bh->b_data, data, size); 1153ac27a0ecSDave Kleikamp if (rest) 1154ac27a0ecSDave Kleikamp memset(bh->b_data + size, 0, rest); 1155ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 1156ac27a0ecSDave Kleikamp unlock_buffer(bh); 1157b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, bh); 1158b4097142STheodore Ts'o if (unlikely(err)) 1159b4097142STheodore Ts'o ext4_std_error(sb, err); 1160ac27a0ecSDave Kleikamp brelse(bh); 116101f795f9SYongqiang Yang 116201f795f9SYongqiang Yang if (meta_bg == 0) 116301f795f9SYongqiang Yang group = ext4_list_backups(sb, &three, &five, &seven); 116401f795f9SYongqiang Yang else if (group == last) 116501f795f9SYongqiang Yang break; 116601f795f9SYongqiang Yang else 116701f795f9SYongqiang Yang group = last; 1168ac27a0ecSDave Kleikamp } 1169617ba13bSMingming Cao if ((err2 = ext4_journal_stop(handle)) && !err) 1170ac27a0ecSDave Kleikamp err = err2; 1171ac27a0ecSDave Kleikamp 1172ac27a0ecSDave Kleikamp /* 1173ac27a0ecSDave Kleikamp * Ugh! Need to have e2fsck write the backup copies. It is too 1174ac27a0ecSDave Kleikamp * late to revert the resize, we shouldn't fail just because of 1175ac27a0ecSDave Kleikamp * the backup copies (they are only needed in case of corruption). 1176ac27a0ecSDave Kleikamp * 1177ac27a0ecSDave Kleikamp * However, if we got here we have a journal problem too, so we 1178ac27a0ecSDave Kleikamp * can't really start a transaction to mark the superblock. 1179ac27a0ecSDave Kleikamp * Chicken out and just set the flag on the hope it will be written 1180ac27a0ecSDave Kleikamp * to disk, and if not - we will simply wait until next fsck. 1181ac27a0ecSDave Kleikamp */ 1182ac27a0ecSDave Kleikamp exit_err: 1183ac27a0ecSDave Kleikamp if (err) { 118412062dddSEric Sandeen ext4_warning(sb, "can't update backup for group %u (err %d), " 1185ac27a0ecSDave Kleikamp "forcing fsck on next reboot", group, err); 1186617ba13bSMingming Cao sbi->s_mount_state &= ~EXT4_VALID_FS; 1187617ba13bSMingming Cao sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1188ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 1189ac27a0ecSDave Kleikamp } 1190ac27a0ecSDave Kleikamp } 1191ac27a0ecSDave Kleikamp 1192bb08c1e7SYongqiang Yang /* 1193bb08c1e7SYongqiang Yang * ext4_add_new_descs() adds @count group descriptor of groups 1194bb08c1e7SYongqiang Yang * starting at @group 1195bb08c1e7SYongqiang Yang * 1196bb08c1e7SYongqiang Yang * @handle: journal handle 1197bb08c1e7SYongqiang Yang * @sb: super block 1198bb08c1e7SYongqiang Yang * @group: the group no. of the first group desc to be added 1199bb08c1e7SYongqiang Yang * @resize_inode: the resize inode 1200bb08c1e7SYongqiang Yang * @count: number of group descriptors to be added 1201bb08c1e7SYongqiang Yang */ 1202bb08c1e7SYongqiang Yang static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, 1203bb08c1e7SYongqiang Yang ext4_group_t group, struct inode *resize_inode, 1204bb08c1e7SYongqiang Yang ext4_group_t count) 1205bb08c1e7SYongqiang Yang { 1206bb08c1e7SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1207bb08c1e7SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 1208bb08c1e7SYongqiang Yang struct buffer_head *gdb_bh; 1209bb08c1e7SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 121001f795f9SYongqiang Yang int meta_bg; 1211bb08c1e7SYongqiang Yang 1212e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 1213bb08c1e7SYongqiang Yang for (i = 0; i < count; i++, group++) { 1214bb08c1e7SYongqiang Yang int reserved_gdb = ext4_bg_has_super(sb, group) ? 1215bb08c1e7SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1216bb08c1e7SYongqiang Yang 1217bb08c1e7SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1218bb08c1e7SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1219bb08c1e7SYongqiang Yang 1220bb08c1e7SYongqiang Yang /* 1221bb08c1e7SYongqiang Yang * We will only either add reserved group blocks to a backup group 1222bb08c1e7SYongqiang Yang * or remove reserved blocks for the first group in a new group block. 1223bb08c1e7SYongqiang Yang * Doing both would be mean more complex code, and sane people don't 1224bb08c1e7SYongqiang Yang * use non-sparse filesystems anymore. This is already checked above. 1225bb08c1e7SYongqiang Yang */ 1226bb08c1e7SYongqiang Yang if (gdb_off) { 12271d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 12281d0c3924STheodore Ts'o gdb_num); 12295d601255Sliang xie BUFFER_TRACE(gdb_bh, "get_write_access"); 1230bb08c1e7SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb_bh); 1231bb08c1e7SYongqiang Yang 1232bb08c1e7SYongqiang Yang if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) 1233bb08c1e7SYongqiang Yang err = reserve_backup_gdb(handle, resize_inode, group); 123401f795f9SYongqiang Yang } else if (meta_bg != 0) { 123501f795f9SYongqiang Yang err = add_new_gdb_meta_bg(sb, handle, group); 123601f795f9SYongqiang Yang } else { 1237bb08c1e7SYongqiang Yang err = add_new_gdb(handle, resize_inode, group); 123801f795f9SYongqiang Yang } 1239bb08c1e7SYongqiang Yang if (err) 1240bb08c1e7SYongqiang Yang break; 1241bb08c1e7SYongqiang Yang } 1242bb08c1e7SYongqiang Yang return err; 1243bb08c1e7SYongqiang Yang } 1244bb08c1e7SYongqiang Yang 124541a246d1SDarrick J. Wong static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 124641a246d1SDarrick J. Wong { 124741a246d1SDarrick J. Wong struct buffer_head *bh = sb_getblk(sb, block); 1248aebf0243SWang Shilong if (unlikely(!bh)) 124941a246d1SDarrick J. Wong return NULL; 12507f1468d1SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 12512d069c08Szhangyi (F) if (ext4_read_bh(bh, 0, NULL) < 0) { 125241a246d1SDarrick J. Wong brelse(bh); 125341a246d1SDarrick J. Wong return NULL; 125441a246d1SDarrick J. Wong } 12557f1468d1SDmitry Monakhov } 125641a246d1SDarrick J. Wong 125741a246d1SDarrick J. Wong return bh; 125841a246d1SDarrick J. Wong } 125941a246d1SDarrick J. Wong 126041a246d1SDarrick J. Wong static int ext4_set_bitmap_checksums(struct super_block *sb, 126141a246d1SDarrick J. Wong ext4_group_t group, 126241a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 126341a246d1SDarrick J. Wong struct ext4_new_group_data *group_data) 126441a246d1SDarrick J. Wong { 126541a246d1SDarrick J. Wong struct buffer_head *bh; 126641a246d1SDarrick J. Wong 12679aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(sb)) 126841a246d1SDarrick J. Wong return 0; 126941a246d1SDarrick J. Wong 127041a246d1SDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->inode_bitmap); 127141a246d1SDarrick J. Wong if (!bh) 127241a246d1SDarrick J. Wong return -EIO; 127341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, bh, 127441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 127541a246d1SDarrick J. Wong brelse(bh); 127641a246d1SDarrick J. Wong 1277fa77dcfaSDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->block_bitmap); 1278fa77dcfaSDarrick J. Wong if (!bh) 1279fa77dcfaSDarrick J. Wong return -EIO; 128079f1ba49STao Ma ext4_block_bitmap_csum_set(sb, group, gdp, bh); 1281fa77dcfaSDarrick J. Wong brelse(bh); 1282fa77dcfaSDarrick J. Wong 128341a246d1SDarrick J. Wong return 0; 128441a246d1SDarrick J. Wong } 128541a246d1SDarrick J. Wong 1286083f5b24SYongqiang Yang /* 1287083f5b24SYongqiang Yang * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg 1288083f5b24SYongqiang Yang */ 1289083f5b24SYongqiang Yang static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, 1290083f5b24SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 1291083f5b24SYongqiang Yang { 1292083f5b24SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 1293083f5b24SYongqiang Yang struct ext4_group_desc *gdp; 1294083f5b24SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1295083f5b24SYongqiang Yang struct buffer_head *gdb_bh; 1296083f5b24SYongqiang Yang ext4_group_t group; 1297083f5b24SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 1298083f5b24SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1299083f5b24SYongqiang Yang 1300083f5b24SYongqiang Yang 1301083f5b24SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { 1302083f5b24SYongqiang Yang group = group_data->group; 1303083f5b24SYongqiang Yang 1304083f5b24SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1305083f5b24SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1306083f5b24SYongqiang Yang 1307083f5b24SYongqiang Yang /* 1308083f5b24SYongqiang Yang * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). 1309083f5b24SYongqiang Yang */ 13101d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); 1311083f5b24SYongqiang Yang /* Update group descriptor block for new group */ 13122716b802STheodore Ts'o gdp = (struct ext4_group_desc *)(gdb_bh->b_data + 1313083f5b24SYongqiang Yang gdb_off * EXT4_DESC_SIZE(sb)); 1314083f5b24SYongqiang Yang 1315083f5b24SYongqiang Yang memset(gdp, 0, EXT4_DESC_SIZE(sb)); 1316083f5b24SYongqiang Yang ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); 1317083f5b24SYongqiang Yang ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); 131841a246d1SDarrick J. Wong err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); 131941a246d1SDarrick J. Wong if (err) { 132041a246d1SDarrick J. Wong ext4_std_error(sb, err); 132141a246d1SDarrick J. Wong break; 132241a246d1SDarrick J. Wong } 132341a246d1SDarrick J. Wong 1324083f5b24SYongqiang Yang ext4_inode_table_set(sb, gdp, group_data->inode_table); 1325083f5b24SYongqiang Yang ext4_free_group_clusters_set(sb, gdp, 1326d77147ffSharshads group_data->free_clusters_count); 1327083f5b24SYongqiang Yang ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); 132893f90526STheodore Ts'o if (ext4_has_group_desc_csum(sb)) 132993f90526STheodore Ts'o ext4_itable_unused_set(sb, gdp, 133093f90526STheodore Ts'o EXT4_INODES_PER_GROUP(sb)); 1331083f5b24SYongqiang Yang gdp->bg_flags = cpu_to_le16(*bg_flags); 1332feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1333083f5b24SYongqiang Yang 1334083f5b24SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 1335083f5b24SYongqiang Yang if (unlikely(err)) { 1336083f5b24SYongqiang Yang ext4_std_error(sb, err); 1337083f5b24SYongqiang Yang break; 1338083f5b24SYongqiang Yang } 1339083f5b24SYongqiang Yang 1340083f5b24SYongqiang Yang /* 1341083f5b24SYongqiang Yang * We can allocate memory for mb_alloc based on the new group 1342083f5b24SYongqiang Yang * descriptor 1343083f5b24SYongqiang Yang */ 1344083f5b24SYongqiang Yang err = ext4_mb_add_groupinfo(sb, group, gdp); 1345083f5b24SYongqiang Yang if (err) 1346083f5b24SYongqiang Yang break; 1347083f5b24SYongqiang Yang } 1348083f5b24SYongqiang Yang return err; 1349083f5b24SYongqiang Yang } 1350083f5b24SYongqiang Yang 13512e10e2f2SYongqiang Yang /* 13522e10e2f2SYongqiang Yang * ext4_update_super() updates the super block so that the newly added 13532e10e2f2SYongqiang Yang * groups can be seen by the filesystem. 13542e10e2f2SYongqiang Yang * 13552e10e2f2SYongqiang Yang * @sb: super block 13562e10e2f2SYongqiang Yang * @flex_gd: new added groups 13572e10e2f2SYongqiang Yang */ 13582e10e2f2SYongqiang Yang static void ext4_update_super(struct super_block *sb, 13592e10e2f2SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 13602e10e2f2SYongqiang Yang { 13612e10e2f2SYongqiang Yang ext4_fsblk_t blocks_count = 0; 13622e10e2f2SYongqiang Yang ext4_fsblk_t free_blocks = 0; 13632e10e2f2SYongqiang Yang ext4_fsblk_t reserved_blocks = 0; 13642e10e2f2SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 13652e10e2f2SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 13662e10e2f2SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 13678a991849STheodore Ts'o int i; 13682e10e2f2SYongqiang Yang 13692e10e2f2SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 13702e10e2f2SYongqiang Yang /* 13712e10e2f2SYongqiang Yang * Make the new blocks and inodes valid next. We do this before 13722e10e2f2SYongqiang Yang * increasing the group count so that once the group is enabled, 13732e10e2f2SYongqiang Yang * all of its blocks and inodes are already valid. 13742e10e2f2SYongqiang Yang * 13752e10e2f2SYongqiang Yang * We always allocate group-by-group, then block-by-block or 13762e10e2f2SYongqiang Yang * inode-by-inode within a group, so enabling these 13772e10e2f2SYongqiang Yang * blocks/inodes before the group is live won't actually let us 13782e10e2f2SYongqiang Yang * allocate the new space yet. 13792e10e2f2SYongqiang Yang */ 13802e10e2f2SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 13812e10e2f2SYongqiang Yang blocks_count += group_data[i].blocks_count; 1382d77147ffSharshads free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); 13832e10e2f2SYongqiang Yang } 13842e10e2f2SYongqiang Yang 13852e10e2f2SYongqiang Yang reserved_blocks = ext4_r_blocks_count(es) * 100; 138601f795f9SYongqiang Yang reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); 13872e10e2f2SYongqiang Yang reserved_blocks *= blocks_count; 13882e10e2f2SYongqiang Yang do_div(reserved_blocks, 100); 13892e10e2f2SYongqiang Yang 1390*05c2c00fSJan Kara lock_buffer(sbi->s_sbh); 13912e10e2f2SYongqiang Yang ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); 1392636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); 13932e10e2f2SYongqiang Yang le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * 13942e10e2f2SYongqiang Yang flex_gd->count); 1395636d7e2eSDarrick J. Wong le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * 1396636d7e2eSDarrick J. Wong flex_gd->count); 13972e10e2f2SYongqiang Yang 139801f795f9SYongqiang Yang ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); 13992e10e2f2SYongqiang Yang /* 14002e10e2f2SYongqiang Yang * We need to protect s_groups_count against other CPUs seeing 14012e10e2f2SYongqiang Yang * inconsistent state in the superblock. 14022e10e2f2SYongqiang Yang * 14032e10e2f2SYongqiang Yang * The precise rules we use are: 14042e10e2f2SYongqiang Yang * 14052e10e2f2SYongqiang Yang * * Writers must perform a smp_wmb() after updating all 14062e10e2f2SYongqiang Yang * dependent data and before modifying the groups count 14072e10e2f2SYongqiang Yang * 14082e10e2f2SYongqiang Yang * * Readers must perform an smp_rmb() after reading the groups 14092e10e2f2SYongqiang Yang * count and before reading any dependent data. 14102e10e2f2SYongqiang Yang * 14112e10e2f2SYongqiang Yang * NB. These rules can be relaxed when checking the group count 14122e10e2f2SYongqiang Yang * while freeing data, as we can only allocate from a block 14132e10e2f2SYongqiang Yang * group after serialising against the group count, and we can 14142e10e2f2SYongqiang Yang * only then free after serialising in turn against that 14152e10e2f2SYongqiang Yang * allocation. 14162e10e2f2SYongqiang Yang */ 14172e10e2f2SYongqiang Yang smp_wmb(); 14182e10e2f2SYongqiang Yang 14192e10e2f2SYongqiang Yang /* Update the global fs size fields */ 14202e10e2f2SYongqiang Yang sbi->s_groups_count += flex_gd->count; 1421c5c72d81STheodore Ts'o sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 1422c5c72d81STheodore Ts'o (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 14232e10e2f2SYongqiang Yang 14242e10e2f2SYongqiang Yang /* Update the reserved block counts only once the new group is 14252e10e2f2SYongqiang Yang * active. */ 14262e10e2f2SYongqiang Yang ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + 14272e10e2f2SYongqiang Yang reserved_blocks); 1428*05c2c00fSJan Kara ext4_superblock_csum_set(sb); 1429*05c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 14302e10e2f2SYongqiang Yang 14312e10e2f2SYongqiang Yang /* Update the free space counts */ 14322e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeclusters_counter, 1433810da240SLukas Czerner EXT4_NUM_B2C(sbi, free_blocks)); 14342e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeinodes_counter, 14352e10e2f2SYongqiang Yang EXT4_INODES_PER_GROUP(sb) * flex_gd->count); 14362e10e2f2SYongqiang Yang 143701f795f9SYongqiang Yang ext4_debug("free blocks count %llu", 143801f795f9SYongqiang Yang percpu_counter_read(&sbi->s_freeclusters_counter)); 1439e2b911c5SDarrick J. Wong if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { 14402e10e2f2SYongqiang Yang ext4_group_t flex_group; 14417c990728SSuraj Jitindar Singh struct flex_groups *fg; 14427c990728SSuraj Jitindar Singh 14432e10e2f2SYongqiang Yang flex_group = ext4_flex_group(sbi, group_data[0].group); 14447c990728SSuraj Jitindar Singh fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); 144590ba983fSTheodore Ts'o atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), 14467c990728SSuraj Jitindar Singh &fg->free_clusters); 14472e10e2f2SYongqiang Yang atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, 14487c990728SSuraj Jitindar Singh &fg->free_inodes); 14492e10e2f2SYongqiang Yang } 14502e10e2f2SYongqiang Yang 1451952fc18eSTheodore Ts'o /* 1452952fc18eSTheodore Ts'o * Update the fs overhead information 1453952fc18eSTheodore Ts'o */ 1454952fc18eSTheodore Ts'o ext4_calculate_overhead(sb); 1455952fc18eSTheodore Ts'o 14562e10e2f2SYongqiang Yang if (test_opt(sb, DEBUG)) 14572e10e2f2SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: added group %u:" 14582e10e2f2SYongqiang Yang "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, 14592e10e2f2SYongqiang Yang blocks_count, free_blocks, reserved_blocks); 14602e10e2f2SYongqiang Yang } 14612e10e2f2SYongqiang Yang 14624bac1f8cSYongqiang Yang /* Add a flex group to an fs. Ensure we handle all possible error conditions 14634bac1f8cSYongqiang Yang * _before_ we start modifying the filesystem, because we cannot abort the 14644bac1f8cSYongqiang Yang * transaction and not have it write the data to disk. 14654bac1f8cSYongqiang Yang */ 14664bac1f8cSYongqiang Yang static int ext4_flex_group_add(struct super_block *sb, 14674bac1f8cSYongqiang Yang struct inode *resize_inode, 14684bac1f8cSYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 14694bac1f8cSYongqiang Yang { 14704bac1f8cSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 14714bac1f8cSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 14724bac1f8cSYongqiang Yang ext4_fsblk_t o_blocks_count; 14734bac1f8cSYongqiang Yang ext4_grpblk_t last; 14744bac1f8cSYongqiang Yang ext4_group_t group; 14754bac1f8cSYongqiang Yang handle_t *handle; 14764bac1f8cSYongqiang Yang unsigned reserved_gdb; 14774bac1f8cSYongqiang Yang int err = 0, err2 = 0, credit; 14784bac1f8cSYongqiang Yang 14794bac1f8cSYongqiang Yang BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); 14804bac1f8cSYongqiang Yang 14814bac1f8cSYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 14824bac1f8cSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 14834bac1f8cSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 14844bac1f8cSYongqiang Yang BUG_ON(last); 14854bac1f8cSYongqiang Yang 14864bac1f8cSYongqiang Yang err = setup_new_flex_group_blocks(sb, flex_gd); 14874bac1f8cSYongqiang Yang if (err) 14884bac1f8cSYongqiang Yang goto exit; 14894bac1f8cSYongqiang Yang /* 14904bac1f8cSYongqiang Yang * We will always be modifying at least the superblock and GDT 14912c869b26SJan Kara * blocks. If we are adding a group past the last current GDT block, 14924bac1f8cSYongqiang Yang * we will also modify the inode and the dindirect block. If we 14934bac1f8cSYongqiang Yang * are adding a group with superblock/GDT backups we will also 14944bac1f8cSYongqiang Yang * modify each of the reserved GDT dindirect blocks. 14954bac1f8cSYongqiang Yang */ 14962c869b26SJan Kara credit = 3; /* sb, resize inode, resize inode dindirect */ 14972c869b26SJan Kara /* GDT blocks */ 14982c869b26SJan Kara credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); 14992c869b26SJan Kara credit += reserved_gdb; /* Reserved GDT dindirect blocks */ 15009924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); 15014bac1f8cSYongqiang Yang if (IS_ERR(handle)) { 15024bac1f8cSYongqiang Yang err = PTR_ERR(handle); 15034bac1f8cSYongqiang Yang goto exit; 15044bac1f8cSYongqiang Yang } 15054bac1f8cSYongqiang Yang 15065d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 15074bac1f8cSYongqiang Yang err = ext4_journal_get_write_access(handle, sbi->s_sbh); 15084bac1f8cSYongqiang Yang if (err) 15094bac1f8cSYongqiang Yang goto exit_journal; 15104bac1f8cSYongqiang Yang 15114bac1f8cSYongqiang Yang group = flex_gd->groups[0].group; 151249598e04SJun Piao BUG_ON(group != sbi->s_groups_count); 15134bac1f8cSYongqiang Yang err = ext4_add_new_descs(handle, sb, group, 15144bac1f8cSYongqiang Yang resize_inode, flex_gd->count); 15154bac1f8cSYongqiang Yang if (err) 15164bac1f8cSYongqiang Yang goto exit_journal; 15174bac1f8cSYongqiang Yang 15184bac1f8cSYongqiang Yang err = ext4_setup_new_descs(handle, sb, flex_gd); 15194bac1f8cSYongqiang Yang if (err) 15204bac1f8cSYongqiang Yang goto exit_journal; 15214bac1f8cSYongqiang Yang 15224bac1f8cSYongqiang Yang ext4_update_super(sb, flex_gd); 15234bac1f8cSYongqiang Yang 15244bac1f8cSYongqiang Yang err = ext4_handle_dirty_super(handle, sb); 15254bac1f8cSYongqiang Yang 15264bac1f8cSYongqiang Yang exit_journal: 15274bac1f8cSYongqiang Yang err2 = ext4_journal_stop(handle); 15284bac1f8cSYongqiang Yang if (!err) 15294bac1f8cSYongqiang Yang err = err2; 15304bac1f8cSYongqiang Yang 15314bac1f8cSYongqiang Yang if (!err) { 15322ebd1704SYongqiang Yang int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 15332ebd1704SYongqiang Yang int gdb_num_end = ((group + flex_gd->count - 1) / 15342ebd1704SYongqiang Yang EXT4_DESC_PER_BLOCK(sb)); 1535e2b911c5SDarrick J. Wong int meta_bg = ext4_has_feature_meta_bg(sb); 15360acdb887STao Ma sector_t old_gdb = 0; 15372ebd1704SYongqiang Yang 15384bac1f8cSYongqiang Yang update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, 153901f795f9SYongqiang Yang sizeof(struct ext4_super_block), 0); 15402ebd1704SYongqiang Yang for (; gdb_num <= gdb_num_end; gdb_num++) { 15414bac1f8cSYongqiang Yang struct buffer_head *gdb_bh; 15422ebd1704SYongqiang Yang 15431d0c3924STheodore Ts'o gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, 15441d0c3924STheodore Ts'o gdb_num); 15450acdb887STao Ma if (old_gdb == gdb_bh->b_blocknr) 15460acdb887STao Ma continue; 15474bac1f8cSYongqiang Yang update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, 154801f795f9SYongqiang Yang gdb_bh->b_size, meta_bg); 15490acdb887STao Ma old_gdb = gdb_bh->b_blocknr; 15504bac1f8cSYongqiang Yang } 15514bac1f8cSYongqiang Yang } 15524bac1f8cSYongqiang Yang exit: 15534bac1f8cSYongqiang Yang return err; 15544bac1f8cSYongqiang Yang } 15554bac1f8cSYongqiang Yang 155619c5246dSYongqiang Yang static int ext4_setup_next_flex_gd(struct super_block *sb, 155719c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 155819c5246dSYongqiang Yang ext4_fsblk_t n_blocks_count, 155919c5246dSYongqiang Yang unsigned long flexbg_size) 156019c5246dSYongqiang Yang { 1561d77147ffSharshads struct ext4_sb_info *sbi = EXT4_SB(sb); 1562d77147ffSharshads struct ext4_super_block *es = sbi->s_es; 156319c5246dSYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 156419c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 156519c5246dSYongqiang Yang ext4_group_t n_group; 156619c5246dSYongqiang Yang ext4_group_t group; 156719c5246dSYongqiang Yang ext4_group_t last_group; 156819c5246dSYongqiang Yang ext4_grpblk_t last; 1569d77147ffSharshads ext4_grpblk_t clusters_per_group; 157019c5246dSYongqiang Yang unsigned long i; 157119c5246dSYongqiang Yang 1572d77147ffSharshads clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); 157319c5246dSYongqiang Yang 157419c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 157519c5246dSYongqiang Yang 157619c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 157719c5246dSYongqiang Yang return 0; 157819c5246dSYongqiang Yang 157919c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 158019c5246dSYongqiang Yang BUG_ON(last); 158119c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); 158219c5246dSYongqiang Yang 158319c5246dSYongqiang Yang last_group = group | (flexbg_size - 1); 158419c5246dSYongqiang Yang if (last_group > n_group) 158519c5246dSYongqiang Yang last_group = n_group; 158619c5246dSYongqiang Yang 158719c5246dSYongqiang Yang flex_gd->count = last_group - group + 1; 158819c5246dSYongqiang Yang 158919c5246dSYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 159019c5246dSYongqiang Yang int overhead; 159119c5246dSYongqiang Yang 159219c5246dSYongqiang Yang group_data[i].group = group + i; 1593d77147ffSharshads group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); 159401f795f9SYongqiang Yang overhead = ext4_group_overhead_blocks(sb, group + i); 1595d77147ffSharshads group_data[i].mdata_blocks = overhead; 1596d77147ffSharshads group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); 15977f511862STheodore Ts'o if (ext4_has_group_desc_csum(sb)) { 159819c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | 159919c5246dSYongqiang Yang EXT4_BG_INODE_UNINIT; 16007f511862STheodore Ts'o if (!test_opt(sb, INIT_INODE_TABLE)) 16017f511862STheodore Ts'o flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; 16027f511862STheodore Ts'o } else 160319c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; 160419c5246dSYongqiang Yang } 160519c5246dSYongqiang Yang 1606feb0ab32SDarrick J. Wong if (last_group == n_group && ext4_has_group_desc_csum(sb)) 160719c5246dSYongqiang Yang /* We need to initialize block bitmap of last group. */ 160819c5246dSYongqiang Yang flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; 160919c5246dSYongqiang Yang 1610d77147ffSharshads if ((last_group == n_group) && (last != clusters_per_group - 1)) { 1611d77147ffSharshads group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); 1612d77147ffSharshads group_data[i - 1].free_clusters_count -= clusters_per_group - 161319c5246dSYongqiang Yang last - 1; 161419c5246dSYongqiang Yang } 161519c5246dSYongqiang Yang 161619c5246dSYongqiang Yang return 1; 161719c5246dSYongqiang Yang } 161819c5246dSYongqiang Yang 1619ac27a0ecSDave Kleikamp /* Add group descriptor data to an existing or new group descriptor block. 1620ac27a0ecSDave Kleikamp * Ensure we handle all possible error conditions _before_ we start modifying 1621ac27a0ecSDave Kleikamp * the filesystem, because we cannot abort the transaction and not have it 1622ac27a0ecSDave Kleikamp * write the data to disk. 1623ac27a0ecSDave Kleikamp * 1624ac27a0ecSDave Kleikamp * If we are on a GDT block boundary, we need to get the reserved GDT block. 1625ac27a0ecSDave Kleikamp * Otherwise, we may need to add backup GDT blocks for a sparse group. 1626ac27a0ecSDave Kleikamp * 1627ac27a0ecSDave Kleikamp * We only need to hold the superblock lock while we are actually adding 1628ac27a0ecSDave Kleikamp * in the new group's counts to the superblock. Prior to that we have 1629ac27a0ecSDave Kleikamp * not really "added" the group at all. We re-check that we are still 1630ac27a0ecSDave Kleikamp * adding in the last group in case things have changed since verifying. 1631ac27a0ecSDave Kleikamp */ 1632617ba13bSMingming Cao int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 1633ac27a0ecSDave Kleikamp { 163461f296ccSYongqiang Yang struct ext4_new_flex_group_data flex_gd; 1635617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1636617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 1637617ba13bSMingming Cao int reserved_gdb = ext4_bg_has_super(sb, input->group) ? 1638ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1639ac27a0ecSDave Kleikamp struct inode *inode = NULL; 164003b40e34SJon Ernst int gdb_off; 164161f296ccSYongqiang Yang int err; 164261f296ccSYongqiang Yang __u16 bg_flags = 0; 1643ac27a0ecSDave Kleikamp 1644617ba13bSMingming Cao gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); 1645ac27a0ecSDave Kleikamp 1646e2b911c5SDarrick J. Wong if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { 164712062dddSEric Sandeen ext4_warning(sb, "Can't resize non-sparse filesystem further"); 1648ac27a0ecSDave Kleikamp return -EPERM; 1649ac27a0ecSDave Kleikamp } 1650ac27a0ecSDave Kleikamp 1651bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) + input->blocks_count < 1652bd81d8eeSLaurent Vivier ext4_blocks_count(es)) { 165312062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1654ac27a0ecSDave Kleikamp return -EINVAL; 1655ac27a0ecSDave Kleikamp } 1656ac27a0ecSDave Kleikamp 1657617ba13bSMingming Cao if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < 1658ac27a0ecSDave Kleikamp le32_to_cpu(es->s_inodes_count)) { 165912062dddSEric Sandeen ext4_warning(sb, "inodes_count overflow"); 1660ac27a0ecSDave Kleikamp return -EINVAL; 1661ac27a0ecSDave Kleikamp } 1662ac27a0ecSDave Kleikamp 1663ac27a0ecSDave Kleikamp if (reserved_gdb || gdb_off == 0) { 1664e647e291Sruippan (潘睿) if (!ext4_has_feature_resize_inode(sb) || 1665e2b911c5SDarrick J. Wong !le16_to_cpu(es->s_reserved_gdt_blocks)) { 166612062dddSEric Sandeen ext4_warning(sb, 1667ac27a0ecSDave Kleikamp "No reserved GDT blocks, can't resize"); 1668ac27a0ecSDave Kleikamp return -EPERM; 1669ac27a0ecSDave Kleikamp } 16708a363970STheodore Ts'o inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); 16711d1fe1eeSDavid Howells if (IS_ERR(inode)) { 167212062dddSEric Sandeen ext4_warning(sb, "Error opening resize inode"); 16731d1fe1eeSDavid Howells return PTR_ERR(inode); 1674ac27a0ecSDave Kleikamp } 1675ac27a0ecSDave Kleikamp } 1676ac27a0ecSDave Kleikamp 1677920313a7SAneesh Kumar K.V 167861f296ccSYongqiang Yang err = verify_group_input(sb, input); 1679668f4dc5SYongqiang Yang if (err) 168061f296ccSYongqiang Yang goto out; 1681ac27a0ecSDave Kleikamp 1682117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, input->group + 1); 1683117fff10STheodore Ts'o if (err) 16847f511862STheodore Ts'o goto out; 1685117fff10STheodore Ts'o 168628623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, input->group + 1); 168728623c2fSTheodore Ts'o if (err) 168828623c2fSTheodore Ts'o goto out; 168928623c2fSTheodore Ts'o 169061f296ccSYongqiang Yang flex_gd.count = 1; 169161f296ccSYongqiang Yang flex_gd.groups = input; 169261f296ccSYongqiang Yang flex_gd.bg_flags = &bg_flags; 169361f296ccSYongqiang Yang err = ext4_flex_group_add(sb, inode, &flex_gd); 169461f296ccSYongqiang Yang out: 1695ac27a0ecSDave Kleikamp iput(inode); 1696ac27a0ecSDave Kleikamp return err; 1697617ba13bSMingming Cao } /* ext4_group_add */ 1698ac27a0ecSDave Kleikamp 16992b2d6d01STheodore Ts'o /* 170018e31438SYongqiang Yang * extend a group without checking assuming that checking has been done. 170118e31438SYongqiang Yang */ 170218e31438SYongqiang Yang static int ext4_group_extend_no_check(struct super_block *sb, 170318e31438SYongqiang Yang ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) 170418e31438SYongqiang Yang { 170518e31438SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 170618e31438SYongqiang Yang handle_t *handle; 170718e31438SYongqiang Yang int err = 0, err2; 170818e31438SYongqiang Yang 170918e31438SYongqiang Yang /* We will update the superblock, one block bitmap, and 171018e31438SYongqiang Yang * one group descriptor via ext4_group_add_blocks(). 171118e31438SYongqiang Yang */ 17129924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); 171318e31438SYongqiang Yang if (IS_ERR(handle)) { 171418e31438SYongqiang Yang err = PTR_ERR(handle); 171518e31438SYongqiang Yang ext4_warning(sb, "error %d on journal start", err); 171618e31438SYongqiang Yang return err; 171718e31438SYongqiang Yang } 171818e31438SYongqiang Yang 17195d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 172018e31438SYongqiang Yang err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); 172118e31438SYongqiang Yang if (err) { 172218e31438SYongqiang Yang ext4_warning(sb, "error %d on journal write access", err); 172318e31438SYongqiang Yang goto errout; 172418e31438SYongqiang Yang } 172518e31438SYongqiang Yang 1726*05c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 172718e31438SYongqiang Yang ext4_blocks_count_set(es, o_blocks_count + add); 1728636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); 1729*05c2c00fSJan Kara ext4_superblock_csum_set(sb); 1730*05c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 173118e31438SYongqiang Yang ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, 173218e31438SYongqiang Yang o_blocks_count + add); 173318e31438SYongqiang Yang /* We add the blocks to the bitmap and set the group need init bit */ 173418e31438SYongqiang Yang err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); 173518e31438SYongqiang Yang if (err) 173618e31438SYongqiang Yang goto errout; 173718e31438SYongqiang Yang ext4_handle_dirty_super(handle, sb); 173818e31438SYongqiang Yang ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, 173918e31438SYongqiang Yang o_blocks_count + add); 174018e31438SYongqiang Yang errout: 174118e31438SYongqiang Yang err2 = ext4_journal_stop(handle); 174218e31438SYongqiang Yang if (err2 && !err) 174318e31438SYongqiang Yang err = err2; 174418e31438SYongqiang Yang 174518e31438SYongqiang Yang if (!err) { 174618e31438SYongqiang Yang if (test_opt(sb, DEBUG)) 174718e31438SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: extended group to %llu " 174818e31438SYongqiang Yang "blocks\n", ext4_blocks_count(es)); 17496ca792edSMaarten ter Huurne update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, 175001f795f9SYongqiang Yang (char *)es, sizeof(struct ext4_super_block), 0); 175118e31438SYongqiang Yang } 175218e31438SYongqiang Yang return err; 175318e31438SYongqiang Yang } 175418e31438SYongqiang Yang 175518e31438SYongqiang Yang /* 17562b2d6d01STheodore Ts'o * Extend the filesystem to the new number of blocks specified. This entry 1757ac27a0ecSDave Kleikamp * point is only used to extend the current filesystem to the end of the last 1758ac27a0ecSDave Kleikamp * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" 1759ac27a0ecSDave Kleikamp * for emergencies (because it has no dependencies on reserved blocks). 1760ac27a0ecSDave Kleikamp * 1761617ba13bSMingming Cao * If we _really_ wanted, we could use default values to call ext4_group_add() 1762ac27a0ecSDave Kleikamp * allow the "remount" trick to work for arbitrary resizing, assuming enough 1763ac27a0ecSDave Kleikamp * GDT blocks are reserved to grow to the desired size. 1764ac27a0ecSDave Kleikamp */ 1765617ba13bSMingming Cao int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, 1766617ba13bSMingming Cao ext4_fsblk_t n_blocks_count) 1767ac27a0ecSDave Kleikamp { 1768617ba13bSMingming Cao ext4_fsblk_t o_blocks_count; 1769617ba13bSMingming Cao ext4_grpblk_t last; 1770617ba13bSMingming Cao ext4_grpblk_t add; 1771ac27a0ecSDave Kleikamp struct buffer_head *bh; 1772d89651c8SYongqiang Yang int err; 17735f21b0e6SFrederic Bohe ext4_group_t group; 1774ac27a0ecSDave Kleikamp 1775bd81d8eeSLaurent Vivier o_blocks_count = ext4_blocks_count(es); 1776ac27a0ecSDave Kleikamp 1777ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 177892b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, 177992b97816STheodore Ts'o "extending last group from %llu to %llu blocks", 1780ac27a0ecSDave Kleikamp o_blocks_count, n_blocks_count); 1781ac27a0ecSDave Kleikamp 1782ac27a0ecSDave Kleikamp if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) 1783ac27a0ecSDave Kleikamp return 0; 1784ac27a0ecSDave Kleikamp 1785ac27a0ecSDave Kleikamp if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 178692b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, 178792b97816STheodore Ts'o "filesystem too large to resize to %llu blocks safely", 178892b97816STheodore Ts'o n_blocks_count); 1789ac27a0ecSDave Kleikamp return -EINVAL; 1790ac27a0ecSDave Kleikamp } 1791ac27a0ecSDave Kleikamp 1792ac27a0ecSDave Kleikamp if (n_blocks_count < o_blocks_count) { 179312062dddSEric Sandeen ext4_warning(sb, "can't shrink FS - resize aborted"); 17948f82f840SYongqiang Yang return -EINVAL; 1795ac27a0ecSDave Kleikamp } 1796ac27a0ecSDave Kleikamp 1797ac27a0ecSDave Kleikamp /* Handle the remaining blocks in the last group only. */ 17985f21b0e6SFrederic Bohe ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 1799ac27a0ecSDave Kleikamp 1800ac27a0ecSDave Kleikamp if (last == 0) { 180112062dddSEric Sandeen ext4_warning(sb, "need to use ext2online to resize further"); 1802ac27a0ecSDave Kleikamp return -EPERM; 1803ac27a0ecSDave Kleikamp } 1804ac27a0ecSDave Kleikamp 1805617ba13bSMingming Cao add = EXT4_BLOCKS_PER_GROUP(sb) - last; 1806ac27a0ecSDave Kleikamp 1807ac27a0ecSDave Kleikamp if (o_blocks_count + add < o_blocks_count) { 180812062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1809ac27a0ecSDave Kleikamp return -EINVAL; 1810ac27a0ecSDave Kleikamp } 1811ac27a0ecSDave Kleikamp 1812ac27a0ecSDave Kleikamp if (o_blocks_count + add > n_blocks_count) 1813ac27a0ecSDave Kleikamp add = n_blocks_count - o_blocks_count; 1814ac27a0ecSDave Kleikamp 1815ac27a0ecSDave Kleikamp if (o_blocks_count + add < n_blocks_count) 181612062dddSEric Sandeen ext4_warning(sb, "will only finish group (%llu blocks, %u new)", 1817ac27a0ecSDave Kleikamp o_blocks_count + add, add); 1818ac27a0ecSDave Kleikamp 1819ac27a0ecSDave Kleikamp /* See if the device is actually as big as what was requested */ 18200a846f49Szhangyi (F) bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); 18210a846f49Szhangyi (F) if (IS_ERR(bh)) { 182212062dddSEric Sandeen ext4_warning(sb, "can't read last block, resize aborted"); 1823ac27a0ecSDave Kleikamp return -ENOSPC; 1824ac27a0ecSDave Kleikamp } 1825ac27a0ecSDave Kleikamp brelse(bh); 1826ac27a0ecSDave Kleikamp 1827d89651c8SYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 1828ac27a0ecSDave Kleikamp return err; 1829617ba13bSMingming Cao } /* ext4_group_extend */ 183019c5246dSYongqiang Yang 18311c6bd717STheodore Ts'o 18321c6bd717STheodore Ts'o static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) 18331c6bd717STheodore Ts'o { 18341c6bd717STheodore Ts'o return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); 18351c6bd717STheodore Ts'o } 18361c6bd717STheodore Ts'o 18371c6bd717STheodore Ts'o /* 18381c6bd717STheodore Ts'o * Release the resize inode and drop the resize_inode feature if there 18391c6bd717STheodore Ts'o * are no more reserved gdt blocks, and then convert the file system 18401c6bd717STheodore Ts'o * to enable meta_bg 18411c6bd717STheodore Ts'o */ 18421c6bd717STheodore Ts'o static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) 18431c6bd717STheodore Ts'o { 18441c6bd717STheodore Ts'o handle_t *handle; 18451c6bd717STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 18461c6bd717STheodore Ts'o struct ext4_super_block *es = sbi->s_es; 184759e31c15STheodore Ts'o struct ext4_inode_info *ei = EXT4_I(inode); 18481c6bd717STheodore Ts'o ext4_fsblk_t nr; 18491c6bd717STheodore Ts'o int i, ret, err = 0; 18501c6bd717STheodore Ts'o int credits = 1; 18511c6bd717STheodore Ts'o 18521c6bd717STheodore Ts'o ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); 185359e31c15STheodore Ts'o if (inode) { 18541c6bd717STheodore Ts'o if (es->s_reserved_gdt_blocks) { 18551c6bd717STheodore Ts'o ext4_error(sb, "Unexpected non-zero " 18561c6bd717STheodore Ts'o "s_reserved_gdt_blocks"); 18571c6bd717STheodore Ts'o return -EPERM; 18581c6bd717STheodore Ts'o } 18591c6bd717STheodore Ts'o 18601c6bd717STheodore Ts'o /* Do a quick sanity check of the resize inode */ 1861d77147ffSharshads if (inode->i_blocks != 1 << (inode->i_blkbits - 1862d77147ffSharshads (9 - sbi->s_cluster_bits))) 18631c6bd717STheodore Ts'o goto invalid_resize_inode; 18641c6bd717STheodore Ts'o for (i = 0; i < EXT4_N_BLOCKS; i++) { 18651c6bd717STheodore Ts'o if (i == EXT4_DIND_BLOCK) { 18661c6bd717STheodore Ts'o if (ei->i_data[i]) 18671c6bd717STheodore Ts'o continue; 18681c6bd717STheodore Ts'o else 18691c6bd717STheodore Ts'o goto invalid_resize_inode; 18701c6bd717STheodore Ts'o } 18711c6bd717STheodore Ts'o if (ei->i_data[i]) 18721c6bd717STheodore Ts'o goto invalid_resize_inode; 18731c6bd717STheodore Ts'o } 18741c6bd717STheodore Ts'o credits += 3; /* block bitmap, bg descriptor, resize inode */ 18751c6bd717STheodore Ts'o } 18761c6bd717STheodore Ts'o 18779924a92aSTheodore Ts'o handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); 18781c6bd717STheodore Ts'o if (IS_ERR(handle)) 18791c6bd717STheodore Ts'o return PTR_ERR(handle); 18801c6bd717STheodore Ts'o 18815d601255Sliang xie BUFFER_TRACE(sbi->s_sbh, "get_write_access"); 18821c6bd717STheodore Ts'o err = ext4_journal_get_write_access(handle, sbi->s_sbh); 18831c6bd717STheodore Ts'o if (err) 18841c6bd717STheodore Ts'o goto errout; 18851c6bd717STheodore Ts'o 1886*05c2c00fSJan Kara lock_buffer(sbi->s_sbh); 1887e2b911c5SDarrick J. Wong ext4_clear_feature_resize_inode(sb); 1888e2b911c5SDarrick J. Wong ext4_set_feature_meta_bg(sb); 18891c6bd717STheodore Ts'o sbi->s_es->s_first_meta_bg = 18901c6bd717STheodore Ts'o cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); 1891*05c2c00fSJan Kara ext4_superblock_csum_set(sb); 1892*05c2c00fSJan Kara unlock_buffer(sbi->s_sbh); 18931c6bd717STheodore Ts'o 18941c6bd717STheodore Ts'o err = ext4_handle_dirty_super(handle, sb); 18951c6bd717STheodore Ts'o if (err) { 18961c6bd717STheodore Ts'o ext4_std_error(sb, err); 18971c6bd717STheodore Ts'o goto errout; 18981c6bd717STheodore Ts'o } 18991c6bd717STheodore Ts'o 19001c6bd717STheodore Ts'o if (inode) { 19011c6bd717STheodore Ts'o nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); 19021c6bd717STheodore Ts'o ext4_free_blocks(handle, inode, NULL, nr, 1, 19031c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 19041c6bd717STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 19051c6bd717STheodore Ts'o ei->i_data[EXT4_DIND_BLOCK] = 0; 19061c6bd717STheodore Ts'o inode->i_blocks = 0; 19071c6bd717STheodore Ts'o 19081c6bd717STheodore Ts'o err = ext4_mark_inode_dirty(handle, inode); 19091c6bd717STheodore Ts'o if (err) 19101c6bd717STheodore Ts'o ext4_std_error(sb, err); 19111c6bd717STheodore Ts'o } 19121c6bd717STheodore Ts'o 19131c6bd717STheodore Ts'o errout: 19141c6bd717STheodore Ts'o ret = ext4_journal_stop(handle); 19151c6bd717STheodore Ts'o if (!err) 19161c6bd717STheodore Ts'o err = ret; 19171c6bd717STheodore Ts'o return ret; 19181c6bd717STheodore Ts'o 19191c6bd717STheodore Ts'o invalid_resize_inode: 19201c6bd717STheodore Ts'o ext4_error(sb, "corrupted/inconsistent resize inode"); 19211c6bd717STheodore Ts'o return -EINVAL; 19221c6bd717STheodore Ts'o } 19231c6bd717STheodore Ts'o 192419c5246dSYongqiang Yang /* 192519c5246dSYongqiang Yang * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count 192619c5246dSYongqiang Yang * 192719c5246dSYongqiang Yang * @sb: super block of the fs to be resized 192819c5246dSYongqiang Yang * @n_blocks_count: the number of blocks resides in the resized fs 192919c5246dSYongqiang Yang */ 193019c5246dSYongqiang Yang int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 193119c5246dSYongqiang Yang { 193219c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd = NULL; 193319c5246dSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 193419c5246dSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 193519c5246dSYongqiang Yang struct buffer_head *bh; 193601f795f9SYongqiang Yang struct inode *resize_inode = NULL; 193701f795f9SYongqiang Yang ext4_grpblk_t add, offset; 193819c5246dSYongqiang Yang unsigned long n_desc_blocks; 193919c5246dSYongqiang Yang unsigned long o_desc_blocks; 194001f795f9SYongqiang Yang ext4_group_t o_group; 194101f795f9SYongqiang Yang ext4_group_t n_group; 194201f795f9SYongqiang Yang ext4_fsblk_t o_blocks_count; 19431c6bd717STheodore Ts'o ext4_fsblk_t n_blocks_count_retry = 0; 19444da4a56eSTheodore Ts'o unsigned long last_update_time = 0; 1945117fff10STheodore Ts'o int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; 194601f795f9SYongqiang Yang int meta_bg; 194719c5246dSYongqiang Yang 194859e31c15STheodore Ts'o /* See if the device is actually as big as what was requested */ 19490a846f49Szhangyi (F) bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); 19500a846f49Szhangyi (F) if (IS_ERR(bh)) { 195159e31c15STheodore Ts'o ext4_warning(sb, "can't read last block, resize aborted"); 195259e31c15STheodore Ts'o return -ENOSPC; 195359e31c15STheodore Ts'o } 195459e31c15STheodore Ts'o brelse(bh); 195559e31c15STheodore Ts'o 19561c6bd717STheodore Ts'o retry: 195719c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 195819c5246dSYongqiang Yang 195959e31c15STheodore Ts'o ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " 196092b97816STheodore Ts'o "to %llu blocks", o_blocks_count, n_blocks_count); 196119c5246dSYongqiang Yang 196219c5246dSYongqiang Yang if (n_blocks_count < o_blocks_count) { 196319c5246dSYongqiang Yang /* On-line shrinking not supported */ 196419c5246dSYongqiang Yang ext4_warning(sb, "can't shrink FS - resize aborted"); 196519c5246dSYongqiang Yang return -EINVAL; 196619c5246dSYongqiang Yang } 196719c5246dSYongqiang Yang 196819c5246dSYongqiang Yang if (n_blocks_count == o_blocks_count) 196919c5246dSYongqiang Yang /* Nothing need to do */ 197019c5246dSYongqiang Yang return 0; 197119c5246dSYongqiang Yang 1972bd86298eSLukas Czerner n_group = ext4_get_group_number(sb, n_blocks_count - 1); 19734f2f76f7SJan Kara if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { 19743f8a6411STheodore Ts'o ext4_warning(sb, "resize would cause inodes_count overflow"); 19753f8a6411STheodore Ts'o return -EINVAL; 19763f8a6411STheodore Ts'o } 1977a0ade1deSLukas Czerner ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); 197819c5246dSYongqiang Yang 19791c6bd717STheodore Ts'o n_desc_blocks = num_desc_blocks(sb, n_group + 1); 19801c6bd717STheodore Ts'o o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); 198119c5246dSYongqiang Yang 1982e2b911c5SDarrick J. Wong meta_bg = ext4_has_feature_meta_bg(sb); 198301f795f9SYongqiang Yang 1984e2b911c5SDarrick J. Wong if (ext4_has_feature_resize_inode(sb)) { 198501f795f9SYongqiang Yang if (meta_bg) { 198601f795f9SYongqiang Yang ext4_error(sb, "resize_inode and meta_bg enabled " 198701f795f9SYongqiang Yang "simultaneously"); 198801f795f9SYongqiang Yang return -EINVAL; 198901f795f9SYongqiang Yang } 19901c6bd717STheodore Ts'o if (n_desc_blocks > o_desc_blocks + 19911c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks)) { 19921c6bd717STheodore Ts'o n_blocks_count_retry = n_blocks_count; 19931c6bd717STheodore Ts'o n_desc_blocks = o_desc_blocks + 19941c6bd717STheodore Ts'o le16_to_cpu(es->s_reserved_gdt_blocks); 19951c6bd717STheodore Ts'o n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); 1996aec51758SJerry Lee n_blocks_count = (ext4_fsblk_t)n_group * 1997f96c3ac8SJan Kara EXT4_BLOCKS_PER_GROUP(sb) + 1998f96c3ac8SJan Kara le32_to_cpu(es->s_first_data_block); 19991c6bd717STheodore Ts'o n_group--; /* set to last group number */ 200019c5246dSYongqiang Yang } 20011c6bd717STheodore Ts'o 20021c6bd717STheodore Ts'o if (!resize_inode) 20038a363970STheodore Ts'o resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, 20048a363970STheodore Ts'o EXT4_IGET_SPECIAL); 200519c5246dSYongqiang Yang if (IS_ERR(resize_inode)) { 200619c5246dSYongqiang Yang ext4_warning(sb, "Error opening resize inode"); 200719c5246dSYongqiang Yang return PTR_ERR(resize_inode); 200819c5246dSYongqiang Yang } 20091c6bd717STheodore Ts'o } 20101c6bd717STheodore Ts'o 201159e31c15STheodore Ts'o if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { 20121c6bd717STheodore Ts'o err = ext4_convert_meta_bg(sb, resize_inode); 20131c6bd717STheodore Ts'o if (err) 20141c6bd717STheodore Ts'o goto out; 20151c6bd717STheodore Ts'o if (resize_inode) { 20161c6bd717STheodore Ts'o iput(resize_inode); 20171c6bd717STheodore Ts'o resize_inode = NULL; 20181c6bd717STheodore Ts'o } 20191c6bd717STheodore Ts'o if (n_blocks_count_retry) { 20201c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 20211c6bd717STheodore Ts'o n_blocks_count_retry = 0; 20221c6bd717STheodore Ts'o goto retry; 20231c6bd717STheodore Ts'o } 202401f795f9SYongqiang Yang } 202519c5246dSYongqiang Yang 2026f0a459deSTheodore Ts'o /* 2027f0a459deSTheodore Ts'o * Make sure the last group has enough space so that it's 2028f0a459deSTheodore Ts'o * guaranteed to have enough space for all metadata blocks 2029f0a459deSTheodore Ts'o * that it might need to hold. (We might not need to store 2030f0a459deSTheodore Ts'o * the inode table blocks in the last block group, but there 2031f0a459deSTheodore Ts'o * will be cases where this might be needed.) 2032f0a459deSTheodore Ts'o */ 2033f0a459deSTheodore Ts'o if ((ext4_group_first_block_no(sb, n_group) + 2034f0a459deSTheodore Ts'o ext4_group_overhead_blocks(sb, n_group) + 2 + 2035f0a459deSTheodore Ts'o sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { 2036f0a459deSTheodore Ts'o n_blocks_count = ext4_group_first_block_no(sb, n_group); 2037f0a459deSTheodore Ts'o n_group--; 2038f0a459deSTheodore Ts'o n_blocks_count_retry = 0; 2039f0a459deSTheodore Ts'o if (resize_inode) { 2040f0a459deSTheodore Ts'o iput(resize_inode); 2041f0a459deSTheodore Ts'o resize_inode = NULL; 2042f0a459deSTheodore Ts'o } 2043f0a459deSTheodore Ts'o goto retry; 2044f0a459deSTheodore Ts'o } 2045f0a459deSTheodore Ts'o 204619c5246dSYongqiang Yang /* extend the last group */ 2047a0ade1deSLukas Czerner if (n_group == o_group) 2048a0ade1deSLukas Czerner add = n_blocks_count - o_blocks_count; 2049a0ade1deSLukas Czerner else 2050d77147ffSharshads add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); 2051a0ade1deSLukas Czerner if (add > 0) { 205219c5246dSYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 205319c5246dSYongqiang Yang if (err) 205419c5246dSYongqiang Yang goto out; 205519c5246dSYongqiang Yang } 205619c5246dSYongqiang Yang 2057d7574ad0SYongqiang Yang if (ext4_blocks_count(es) == n_blocks_count) 205819c5246dSYongqiang Yang goto out; 205919c5246dSYongqiang Yang 2060117fff10STheodore Ts'o err = ext4_alloc_flex_bg_array(sb, n_group + 1); 2061117fff10STheodore Ts'o if (err) 2062f348e224SVasily Averin goto out; 2063117fff10STheodore Ts'o 206428623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, n_group + 1); 206528623c2fSTheodore Ts'o if (err) 206628623c2fSTheodore Ts'o goto out; 206728623c2fSTheodore Ts'o 206819c5246dSYongqiang Yang flex_gd = alloc_flex_gd(flexbg_size); 206919c5246dSYongqiang Yang if (flex_gd == NULL) { 207019c5246dSYongqiang Yang err = -ENOMEM; 207119c5246dSYongqiang Yang goto out; 207219c5246dSYongqiang Yang } 207319c5246dSYongqiang Yang 207419c5246dSYongqiang Yang /* Add flex groups. Note that a regular group is a 207519c5246dSYongqiang Yang * flex group with 1 group. 207619c5246dSYongqiang Yang */ 207719c5246dSYongqiang Yang while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, 207819c5246dSYongqiang Yang flexbg_size)) { 20794da4a56eSTheodore Ts'o if (jiffies - last_update_time > HZ * 10) { 20804da4a56eSTheodore Ts'o if (last_update_time) 20814da4a56eSTheodore Ts'o ext4_msg(sb, KERN_INFO, 20824da4a56eSTheodore Ts'o "resized to %llu blocks", 20834da4a56eSTheodore Ts'o ext4_blocks_count(es)); 20844da4a56eSTheodore Ts'o last_update_time = jiffies; 20854da4a56eSTheodore Ts'o } 208603c1c290SYongqiang Yang if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) 208703c1c290SYongqiang Yang break; 208819c5246dSYongqiang Yang err = ext4_flex_group_add(sb, resize_inode, flex_gd); 208919c5246dSYongqiang Yang if (unlikely(err)) 209019c5246dSYongqiang Yang break; 209119c5246dSYongqiang Yang } 209219c5246dSYongqiang Yang 20931c6bd717STheodore Ts'o if (!err && n_blocks_count_retry) { 20941c6bd717STheodore Ts'o n_blocks_count = n_blocks_count_retry; 20951c6bd717STheodore Ts'o n_blocks_count_retry = 0; 20961c6bd717STheodore Ts'o free_flex_gd(flex_gd); 20971c6bd717STheodore Ts'o flex_gd = NULL; 2098db6aee62SVasily Averin if (resize_inode) { 2099db6aee62SVasily Averin iput(resize_inode); 2100db6aee62SVasily Averin resize_inode = NULL; 2101db6aee62SVasily Averin } 21021c6bd717STheodore Ts'o goto retry; 21031c6bd717STheodore Ts'o } 21041c6bd717STheodore Ts'o 210519c5246dSYongqiang Yang out: 210619c5246dSYongqiang Yang if (flex_gd) 210719c5246dSYongqiang Yang free_flex_gd(flex_gd); 210801f795f9SYongqiang Yang if (resize_inode != NULL) 210919c5246dSYongqiang Yang iput(resize_inode); 21106c732840SLukas Czerner if (err) 21116c732840SLukas Czerner ext4_warning(sb, "error (%d) occurred during " 21126c732840SLukas Czerner "file system resize", err); 21136c732840SLukas Czerner ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", 21146c732840SLukas Czerner ext4_blocks_count(es)); 211519c5246dSYongqiang Yang return err; 211619c5246dSYongqiang Yang } 2117