1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/resize.c 3ac27a0ecSDave Kleikamp * 4617ba13bSMingming Cao * Support for resizing an ext4 filesystem while it is mounted. 5ac27a0ecSDave Kleikamp * 6ac27a0ecSDave Kleikamp * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> 7ac27a0ecSDave Kleikamp * 8ac27a0ecSDave Kleikamp * This could probably be made into a module, because it is not often in use. 9ac27a0ecSDave Kleikamp */ 10ac27a0ecSDave Kleikamp 11ac27a0ecSDave Kleikamp 12617ba13bSMingming Cao #define EXT4FS_DEBUG 13ac27a0ecSDave Kleikamp 14ac27a0ecSDave Kleikamp #include <linux/errno.h> 15ac27a0ecSDave Kleikamp #include <linux/slab.h> 16ac27a0ecSDave Kleikamp 173dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 18ac27a0ecSDave Kleikamp 198f82f840SYongqiang Yang int ext4_resize_begin(struct super_block *sb) 208f82f840SYongqiang Yang { 218f82f840SYongqiang Yang int ret = 0; 228f82f840SYongqiang Yang 238f82f840SYongqiang Yang if (!capable(CAP_SYS_RESOURCE)) 248f82f840SYongqiang Yang return -EPERM; 258f82f840SYongqiang Yang 26ce723c31SYongqiang Yang /* 27ce723c31SYongqiang Yang * We are not allowed to do online-resizing on a filesystem mounted 28ce723c31SYongqiang Yang * with error, because it can destroy the filesystem easily. 29ce723c31SYongqiang Yang */ 30ce723c31SYongqiang Yang if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 31ce723c31SYongqiang Yang ext4_warning(sb, "There are errors in the filesystem, " 32ce723c31SYongqiang Yang "so online resizing is not allowed\n"); 33ce723c31SYongqiang Yang return -EPERM; 34ce723c31SYongqiang Yang } 35ce723c31SYongqiang Yang 368f82f840SYongqiang Yang if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) 378f82f840SYongqiang Yang ret = -EBUSY; 388f82f840SYongqiang Yang 398f82f840SYongqiang Yang return ret; 408f82f840SYongqiang Yang } 418f82f840SYongqiang Yang 428f82f840SYongqiang Yang void ext4_resize_end(struct super_block *sb) 438f82f840SYongqiang Yang { 448f82f840SYongqiang Yang clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags); 458f82f840SYongqiang Yang smp_mb__after_clear_bit(); 468f82f840SYongqiang Yang } 478f82f840SYongqiang Yang 48ac27a0ecSDave Kleikamp #define outside(b, first, last) ((b) < (first) || (b) >= (last)) 49ac27a0ecSDave Kleikamp #define inside(b, first, last) ((b) >= (first) && (b) < (last)) 50ac27a0ecSDave Kleikamp 51ac27a0ecSDave Kleikamp static int verify_group_input(struct super_block *sb, 52617ba13bSMingming Cao struct ext4_new_group_data *input) 53ac27a0ecSDave Kleikamp { 54617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 55617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 56bd81d8eeSLaurent Vivier ext4_fsblk_t start = ext4_blocks_count(es); 57617ba13bSMingming Cao ext4_fsblk_t end = start + input->blocks_count; 58fd2d4291SAvantika Mathur ext4_group_t group = input->group; 59617ba13bSMingming Cao ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; 60617ba13bSMingming Cao unsigned overhead = ext4_bg_has_super(sb, group) ? 61617ba13bSMingming Cao (1 + ext4_bg_num_gdb(sb, group) + 62ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; 63617ba13bSMingming Cao ext4_fsblk_t metaend = start + overhead; 64ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 653a5b2ecdSMingming Cao ext4_grpblk_t free_blocks_count, offset; 66ac27a0ecSDave Kleikamp int err = -EINVAL; 67ac27a0ecSDave Kleikamp 68ac27a0ecSDave Kleikamp input->free_blocks_count = free_blocks_count = 69ac27a0ecSDave Kleikamp input->blocks_count - 2 - overhead - sbi->s_itb_per_group; 70ac27a0ecSDave Kleikamp 71ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 72617ba13bSMingming Cao printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " 73ac27a0ecSDave Kleikamp "(%d free, %u reserved)\n", 74617ba13bSMingming Cao ext4_bg_has_super(sb, input->group) ? "normal" : 75ac27a0ecSDave Kleikamp "no-super", input->group, input->blocks_count, 76ac27a0ecSDave Kleikamp free_blocks_count, input->reserved_blocks); 77ac27a0ecSDave Kleikamp 783a5b2ecdSMingming Cao ext4_get_group_no_and_offset(sb, start, NULL, &offset); 79ac27a0ecSDave Kleikamp if (group != sbi->s_groups_count) 8012062dddSEric Sandeen ext4_warning(sb, "Cannot add at group %u (only %u groups)", 81ac27a0ecSDave Kleikamp input->group, sbi->s_groups_count); 823a5b2ecdSMingming Cao else if (offset != 0) 8312062dddSEric Sandeen ext4_warning(sb, "Last group not full"); 84ac27a0ecSDave Kleikamp else if (input->reserved_blocks > input->blocks_count / 5) 8512062dddSEric Sandeen ext4_warning(sb, "Reserved blocks too high (%u)", 86ac27a0ecSDave Kleikamp input->reserved_blocks); 87ac27a0ecSDave Kleikamp else if (free_blocks_count < 0) 8812062dddSEric Sandeen ext4_warning(sb, "Bad blocks count %u", 89ac27a0ecSDave Kleikamp input->blocks_count); 90ac27a0ecSDave Kleikamp else if (!(bh = sb_bread(sb, end - 1))) 9112062dddSEric Sandeen ext4_warning(sb, "Cannot read last block (%llu)", 92ac27a0ecSDave Kleikamp end - 1); 93ac27a0ecSDave Kleikamp else if (outside(input->block_bitmap, start, end)) 9412062dddSEric Sandeen ext4_warning(sb, "Block bitmap not in group (block %llu)", 951939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 96ac27a0ecSDave Kleikamp else if (outside(input->inode_bitmap, start, end)) 9712062dddSEric Sandeen ext4_warning(sb, "Inode bitmap not in group (block %llu)", 981939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap); 99ac27a0ecSDave Kleikamp else if (outside(input->inode_table, start, end) || 100ac27a0ecSDave Kleikamp outside(itend - 1, start, end)) 10112062dddSEric Sandeen ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", 1021939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 103ac27a0ecSDave Kleikamp else if (input->inode_bitmap == input->block_bitmap) 10412062dddSEric Sandeen ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", 1051939e49aSRandy Dunlap (unsigned long long)input->block_bitmap); 106ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, input->inode_table, itend)) 10712062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in inode table " 10812062dddSEric Sandeen "(%llu-%llu)", 1091939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1101939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 111ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, input->inode_table, itend)) 11212062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in inode table " 11312062dddSEric Sandeen "(%llu-%llu)", 1141939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1151939e49aSRandy Dunlap (unsigned long long)input->inode_table, itend - 1); 116ac27a0ecSDave Kleikamp else if (inside(input->block_bitmap, start, metaend)) 11712062dddSEric Sandeen ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", 1181939e49aSRandy Dunlap (unsigned long long)input->block_bitmap, 1191939e49aSRandy Dunlap start, metaend - 1); 120ac27a0ecSDave Kleikamp else if (inside(input->inode_bitmap, start, metaend)) 12112062dddSEric Sandeen ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", 1221939e49aSRandy Dunlap (unsigned long long)input->inode_bitmap, 1231939e49aSRandy Dunlap start, metaend - 1); 124ac27a0ecSDave Kleikamp else if (inside(input->inode_table, start, metaend) || 125ac27a0ecSDave Kleikamp inside(itend - 1, start, metaend)) 12612062dddSEric Sandeen ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " 12712062dddSEric Sandeen "(%llu-%llu)", 1281939e49aSRandy Dunlap (unsigned long long)input->inode_table, 1291939e49aSRandy Dunlap itend - 1, start, metaend - 1); 130ac27a0ecSDave Kleikamp else 131ac27a0ecSDave Kleikamp err = 0; 132ac27a0ecSDave Kleikamp brelse(bh); 133ac27a0ecSDave Kleikamp 134ac27a0ecSDave Kleikamp return err; 135ac27a0ecSDave Kleikamp } 136ac27a0ecSDave Kleikamp 13728c7bac0SYongqiang Yang /* 13828c7bac0SYongqiang Yang * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex 13928c7bac0SYongqiang Yang * group each time. 14028c7bac0SYongqiang Yang */ 14128c7bac0SYongqiang Yang struct ext4_new_flex_group_data { 14228c7bac0SYongqiang Yang struct ext4_new_group_data *groups; /* new_group_data for groups 14328c7bac0SYongqiang Yang in the flex group */ 14428c7bac0SYongqiang Yang __u16 *bg_flags; /* block group flags of groups 14528c7bac0SYongqiang Yang in @groups */ 14628c7bac0SYongqiang Yang ext4_group_t count; /* number of groups in @groups 14728c7bac0SYongqiang Yang */ 14828c7bac0SYongqiang Yang }; 14928c7bac0SYongqiang Yang 15028c7bac0SYongqiang Yang /* 15128c7bac0SYongqiang Yang * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of 15228c7bac0SYongqiang Yang * @flexbg_size. 15328c7bac0SYongqiang Yang * 15428c7bac0SYongqiang Yang * Returns NULL on failure otherwise address of the allocated structure. 15528c7bac0SYongqiang Yang */ 15628c7bac0SYongqiang Yang static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) 15728c7bac0SYongqiang Yang { 15828c7bac0SYongqiang Yang struct ext4_new_flex_group_data *flex_gd; 15928c7bac0SYongqiang Yang 16028c7bac0SYongqiang Yang flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); 16128c7bac0SYongqiang Yang if (flex_gd == NULL) 16228c7bac0SYongqiang Yang goto out3; 16328c7bac0SYongqiang Yang 164967ac8afSHaogang Chen if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) 165967ac8afSHaogang Chen goto out2; 16628c7bac0SYongqiang Yang flex_gd->count = flexbg_size; 16728c7bac0SYongqiang Yang 16828c7bac0SYongqiang Yang flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * 16928c7bac0SYongqiang Yang flexbg_size, GFP_NOFS); 17028c7bac0SYongqiang Yang if (flex_gd->groups == NULL) 17128c7bac0SYongqiang Yang goto out2; 17228c7bac0SYongqiang Yang 17328c7bac0SYongqiang Yang flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); 17428c7bac0SYongqiang Yang if (flex_gd->bg_flags == NULL) 17528c7bac0SYongqiang Yang goto out1; 17628c7bac0SYongqiang Yang 17728c7bac0SYongqiang Yang return flex_gd; 17828c7bac0SYongqiang Yang 17928c7bac0SYongqiang Yang out1: 18028c7bac0SYongqiang Yang kfree(flex_gd->groups); 18128c7bac0SYongqiang Yang out2: 18228c7bac0SYongqiang Yang kfree(flex_gd); 18328c7bac0SYongqiang Yang out3: 18428c7bac0SYongqiang Yang return NULL; 18528c7bac0SYongqiang Yang } 18628c7bac0SYongqiang Yang 18728c7bac0SYongqiang Yang static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) 18828c7bac0SYongqiang Yang { 18928c7bac0SYongqiang Yang kfree(flex_gd->bg_flags); 19028c7bac0SYongqiang Yang kfree(flex_gd->groups); 19128c7bac0SYongqiang Yang kfree(flex_gd); 19228c7bac0SYongqiang Yang } 19328c7bac0SYongqiang Yang 1943fbea4b3SYongqiang Yang /* 1953fbea4b3SYongqiang Yang * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps 1963fbea4b3SYongqiang Yang * and inode tables for a flex group. 1973fbea4b3SYongqiang Yang * 1983fbea4b3SYongqiang Yang * This function is used by 64bit-resize. Note that this function allocates 1993fbea4b3SYongqiang Yang * group tables from the 1st group of groups contained by @flexgd, which may 2003fbea4b3SYongqiang Yang * be a partial of a flex group. 2013fbea4b3SYongqiang Yang * 2023fbea4b3SYongqiang Yang * @sb: super block of fs to which the groups belongs 20303c1c290SYongqiang Yang * 20403c1c290SYongqiang Yang * Returns 0 on a successful allocation of the metadata blocks in the 20503c1c290SYongqiang Yang * block group. 2063fbea4b3SYongqiang Yang */ 20703c1c290SYongqiang Yang static int ext4_alloc_group_tables(struct super_block *sb, 2083fbea4b3SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 2093fbea4b3SYongqiang Yang int flexbg_size) 2103fbea4b3SYongqiang Yang { 2113fbea4b3SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 2123fbea4b3SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 2133fbea4b3SYongqiang Yang ext4_fsblk_t start_blk; 2143fbea4b3SYongqiang Yang ext4_fsblk_t last_blk; 2153fbea4b3SYongqiang Yang ext4_group_t src_group; 2163fbea4b3SYongqiang Yang ext4_group_t bb_index = 0; 2173fbea4b3SYongqiang Yang ext4_group_t ib_index = 0; 2183fbea4b3SYongqiang Yang ext4_group_t it_index = 0; 2193fbea4b3SYongqiang Yang ext4_group_t group; 2203fbea4b3SYongqiang Yang ext4_group_t last_group; 2213fbea4b3SYongqiang Yang unsigned overhead; 2223fbea4b3SYongqiang Yang 2233fbea4b3SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 2243fbea4b3SYongqiang Yang 2253fbea4b3SYongqiang Yang src_group = group_data[0].group; 2263fbea4b3SYongqiang Yang last_group = src_group + flex_gd->count - 1; 2273fbea4b3SYongqiang Yang 2283fbea4b3SYongqiang Yang BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != 2293fbea4b3SYongqiang Yang (last_group & ~(flexbg_size - 1)))); 2303fbea4b3SYongqiang Yang next_group: 2313fbea4b3SYongqiang Yang group = group_data[0].group; 23203c1c290SYongqiang Yang if (src_group >= group_data[0].group + flex_gd->count) 23303c1c290SYongqiang Yang return -ENOSPC; 2343fbea4b3SYongqiang Yang start_blk = ext4_group_first_block_no(sb, src_group); 2353fbea4b3SYongqiang Yang last_blk = start_blk + group_data[src_group - group].blocks_count; 2363fbea4b3SYongqiang Yang 2373fbea4b3SYongqiang Yang overhead = ext4_bg_has_super(sb, src_group) ? 2383fbea4b3SYongqiang Yang (1 + ext4_bg_num_gdb(sb, src_group) + 2393fbea4b3SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; 2403fbea4b3SYongqiang Yang 2413fbea4b3SYongqiang Yang start_blk += overhead; 2423fbea4b3SYongqiang Yang 2433fbea4b3SYongqiang Yang /* We collect contiguous blocks as much as possible. */ 2443fbea4b3SYongqiang Yang src_group++; 2453fbea4b3SYongqiang Yang for (; src_group <= last_group; src_group++) 2463fbea4b3SYongqiang Yang if (!ext4_bg_has_super(sb, src_group)) 2473fbea4b3SYongqiang Yang last_blk += group_data[src_group - group].blocks_count; 2483fbea4b3SYongqiang Yang else 2493fbea4b3SYongqiang Yang break; 2503fbea4b3SYongqiang Yang 2513fbea4b3SYongqiang Yang /* Allocate block bitmaps */ 2523fbea4b3SYongqiang Yang for (; bb_index < flex_gd->count; bb_index++) { 2533fbea4b3SYongqiang Yang if (start_blk >= last_blk) 2543fbea4b3SYongqiang Yang goto next_group; 2553fbea4b3SYongqiang Yang group_data[bb_index].block_bitmap = start_blk++; 2563fbea4b3SYongqiang Yang ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); 2573fbea4b3SYongqiang Yang group -= group_data[0].group; 2583fbea4b3SYongqiang Yang group_data[group].free_blocks_count--; 2593fbea4b3SYongqiang Yang if (flexbg_size > 1) 2603fbea4b3SYongqiang Yang flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; 2613fbea4b3SYongqiang Yang } 2623fbea4b3SYongqiang Yang 2633fbea4b3SYongqiang Yang /* Allocate inode bitmaps */ 2643fbea4b3SYongqiang Yang for (; ib_index < flex_gd->count; ib_index++) { 2653fbea4b3SYongqiang Yang if (start_blk >= last_blk) 2663fbea4b3SYongqiang Yang goto next_group; 2673fbea4b3SYongqiang Yang group_data[ib_index].inode_bitmap = start_blk++; 2683fbea4b3SYongqiang Yang ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); 2693fbea4b3SYongqiang Yang group -= group_data[0].group; 2703fbea4b3SYongqiang Yang group_data[group].free_blocks_count--; 2713fbea4b3SYongqiang Yang if (flexbg_size > 1) 2723fbea4b3SYongqiang Yang flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; 2733fbea4b3SYongqiang Yang } 2743fbea4b3SYongqiang Yang 2753fbea4b3SYongqiang Yang /* Allocate inode tables */ 2763fbea4b3SYongqiang Yang for (; it_index < flex_gd->count; it_index++) { 2773fbea4b3SYongqiang Yang if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) 2783fbea4b3SYongqiang Yang goto next_group; 2793fbea4b3SYongqiang Yang group_data[it_index].inode_table = start_blk; 2803fbea4b3SYongqiang Yang ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); 2813fbea4b3SYongqiang Yang group -= group_data[0].group; 2823fbea4b3SYongqiang Yang group_data[group].free_blocks_count -= 2833fbea4b3SYongqiang Yang EXT4_SB(sb)->s_itb_per_group; 2843fbea4b3SYongqiang Yang if (flexbg_size > 1) 2853fbea4b3SYongqiang Yang flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; 2863fbea4b3SYongqiang Yang 2873fbea4b3SYongqiang Yang start_blk += EXT4_SB(sb)->s_itb_per_group; 2883fbea4b3SYongqiang Yang } 2893fbea4b3SYongqiang Yang 2903fbea4b3SYongqiang Yang if (test_opt(sb, DEBUG)) { 2913fbea4b3SYongqiang Yang int i; 2923fbea4b3SYongqiang Yang group = group_data[0].group; 2933fbea4b3SYongqiang Yang 2943fbea4b3SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: adding a flex group with " 2953fbea4b3SYongqiang Yang "%d groups, flexbg size is %d:\n", flex_gd->count, 2963fbea4b3SYongqiang Yang flexbg_size); 2973fbea4b3SYongqiang Yang 2983fbea4b3SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 2993fbea4b3SYongqiang Yang printk(KERN_DEBUG "adding %s group %u: %u " 3003fbea4b3SYongqiang Yang "blocks (%d free)\n", 3013fbea4b3SYongqiang Yang ext4_bg_has_super(sb, group + i) ? "normal" : 3023fbea4b3SYongqiang Yang "no-super", group + i, 3033fbea4b3SYongqiang Yang group_data[i].blocks_count, 3043fbea4b3SYongqiang Yang group_data[i].free_blocks_count); 3053fbea4b3SYongqiang Yang } 3063fbea4b3SYongqiang Yang } 30703c1c290SYongqiang Yang return 0; 3083fbea4b3SYongqiang Yang } 3093fbea4b3SYongqiang Yang 310ac27a0ecSDave Kleikamp static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, 311617ba13bSMingming Cao ext4_fsblk_t blk) 312ac27a0ecSDave Kleikamp { 313ac27a0ecSDave Kleikamp struct buffer_head *bh; 314ac27a0ecSDave Kleikamp int err; 315ac27a0ecSDave Kleikamp 316ac27a0ecSDave Kleikamp bh = sb_getblk(sb, blk); 317ac27a0ecSDave Kleikamp if (!bh) 318ac27a0ecSDave Kleikamp return ERR_PTR(-EIO); 319617ba13bSMingming Cao if ((err = ext4_journal_get_write_access(handle, bh))) { 320ac27a0ecSDave Kleikamp brelse(bh); 321ac27a0ecSDave Kleikamp bh = ERR_PTR(err); 322ac27a0ecSDave Kleikamp } else { 323ac27a0ecSDave Kleikamp memset(bh->b_data, 0, sb->s_blocksize); 324ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 325ac27a0ecSDave Kleikamp } 326ac27a0ecSDave Kleikamp 327ac27a0ecSDave Kleikamp return bh; 328ac27a0ecSDave Kleikamp } 329ac27a0ecSDave Kleikamp 330ac27a0ecSDave Kleikamp /* 33114904107SEric Sandeen * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. 33214904107SEric Sandeen * If that fails, restart the transaction & regain write access for the 33314904107SEric Sandeen * buffer head which is used for block_bitmap modifications. 33414904107SEric Sandeen */ 3356d40bc5aSYongqiang Yang static int extend_or_restart_transaction(handle_t *handle, int thresh) 33614904107SEric Sandeen { 33714904107SEric Sandeen int err; 33814904107SEric Sandeen 3390390131bSFrank Mayhar if (ext4_handle_has_enough_credits(handle, thresh)) 34014904107SEric Sandeen return 0; 34114904107SEric Sandeen 34214904107SEric Sandeen err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); 34314904107SEric Sandeen if (err < 0) 34414904107SEric Sandeen return err; 34514904107SEric Sandeen if (err) { 3466d40bc5aSYongqiang Yang err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); 3476d40bc5aSYongqiang Yang if (err) 34814904107SEric Sandeen return err; 34914904107SEric Sandeen } 35014904107SEric Sandeen 35114904107SEric Sandeen return 0; 35214904107SEric Sandeen } 35314904107SEric Sandeen 35414904107SEric Sandeen /* 35533afdcc5SYongqiang Yang * set_flexbg_block_bitmap() mark @count blocks starting from @block used. 35633afdcc5SYongqiang Yang * 35733afdcc5SYongqiang Yang * Helper function for ext4_setup_new_group_blocks() which set . 35833afdcc5SYongqiang Yang * 35933afdcc5SYongqiang Yang * @sb: super block 36033afdcc5SYongqiang Yang * @handle: journal handle 36133afdcc5SYongqiang Yang * @flex_gd: flex group data 36233afdcc5SYongqiang Yang */ 36333afdcc5SYongqiang Yang static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, 36433afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 36533afdcc5SYongqiang Yang ext4_fsblk_t block, ext4_group_t count) 36633afdcc5SYongqiang Yang { 36733afdcc5SYongqiang Yang ext4_group_t count2; 36833afdcc5SYongqiang Yang 36933afdcc5SYongqiang Yang ext4_debug("mark blocks [%llu/%u] used\n", block, count); 37033afdcc5SYongqiang Yang for (count2 = count; count > 0; count -= count2, block += count2) { 37133afdcc5SYongqiang Yang ext4_fsblk_t start; 37233afdcc5SYongqiang Yang struct buffer_head *bh; 37333afdcc5SYongqiang Yang ext4_group_t group; 37433afdcc5SYongqiang Yang int err; 37533afdcc5SYongqiang Yang 37633afdcc5SYongqiang Yang ext4_get_group_no_and_offset(sb, block, &group, NULL); 37733afdcc5SYongqiang Yang start = ext4_group_first_block_no(sb, group); 37833afdcc5SYongqiang Yang group -= flex_gd->groups[0].group; 37933afdcc5SYongqiang Yang 38033afdcc5SYongqiang Yang count2 = sb->s_blocksize * 8 - (block - start); 38133afdcc5SYongqiang Yang if (count2 > count) 38233afdcc5SYongqiang Yang count2 = count; 38333afdcc5SYongqiang Yang 38433afdcc5SYongqiang Yang if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { 38533afdcc5SYongqiang Yang BUG_ON(flex_gd->count > 1); 38633afdcc5SYongqiang Yang continue; 38733afdcc5SYongqiang Yang } 38833afdcc5SYongqiang Yang 38933afdcc5SYongqiang Yang err = extend_or_restart_transaction(handle, 1); 39033afdcc5SYongqiang Yang if (err) 39133afdcc5SYongqiang Yang return err; 39233afdcc5SYongqiang Yang 39333afdcc5SYongqiang Yang bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); 39433afdcc5SYongqiang Yang if (!bh) 39533afdcc5SYongqiang Yang return -EIO; 39633afdcc5SYongqiang Yang 39733afdcc5SYongqiang Yang err = ext4_journal_get_write_access(handle, bh); 39833afdcc5SYongqiang Yang if (err) 39933afdcc5SYongqiang Yang return err; 40033afdcc5SYongqiang Yang ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, 40133afdcc5SYongqiang Yang block - start, count2); 40233afdcc5SYongqiang Yang ext4_set_bits(bh->b_data, block - start, count2); 40333afdcc5SYongqiang Yang 40433afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 40533afdcc5SYongqiang Yang if (unlikely(err)) 40633afdcc5SYongqiang Yang return err; 40733afdcc5SYongqiang Yang brelse(bh); 40833afdcc5SYongqiang Yang } 40933afdcc5SYongqiang Yang 41033afdcc5SYongqiang Yang return 0; 41133afdcc5SYongqiang Yang } 41233afdcc5SYongqiang Yang 41333afdcc5SYongqiang Yang /* 41433afdcc5SYongqiang Yang * Set up the block and inode bitmaps, and the inode table for the new groups. 41533afdcc5SYongqiang Yang * This doesn't need to be part of the main transaction, since we are only 41633afdcc5SYongqiang Yang * changing blocks outside the actual filesystem. We still do journaling to 41733afdcc5SYongqiang Yang * ensure the recovery is correct in case of a failure just after resize. 41833afdcc5SYongqiang Yang * If any part of this fails, we simply abort the resize. 41933afdcc5SYongqiang Yang * 42033afdcc5SYongqiang Yang * setup_new_flex_group_blocks handles a flex group as follow: 42133afdcc5SYongqiang Yang * 1. copy super block and GDT, and initialize group tables if necessary. 42233afdcc5SYongqiang Yang * In this step, we only set bits in blocks bitmaps for blocks taken by 42333afdcc5SYongqiang Yang * super block and GDT. 42433afdcc5SYongqiang Yang * 2. allocate group tables in block bitmaps, that is, set bits in block 42533afdcc5SYongqiang Yang * bitmap for blocks taken by group tables. 42633afdcc5SYongqiang Yang */ 42733afdcc5SYongqiang Yang static int setup_new_flex_group_blocks(struct super_block *sb, 42833afdcc5SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 42933afdcc5SYongqiang Yang { 43033afdcc5SYongqiang Yang int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; 43133afdcc5SYongqiang Yang ext4_fsblk_t start; 43233afdcc5SYongqiang Yang ext4_fsblk_t block; 43333afdcc5SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 43433afdcc5SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 43533afdcc5SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 43633afdcc5SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 43733afdcc5SYongqiang Yang handle_t *handle; 43833afdcc5SYongqiang Yang ext4_group_t group, count; 43933afdcc5SYongqiang Yang struct buffer_head *bh = NULL; 44033afdcc5SYongqiang Yang int reserved_gdb, i, j, err = 0, err2; 44133afdcc5SYongqiang Yang 44233afdcc5SYongqiang Yang BUG_ON(!flex_gd->count || !group_data || 44333afdcc5SYongqiang Yang group_data[0].group != sbi->s_groups_count); 44433afdcc5SYongqiang Yang 44533afdcc5SYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 44633afdcc5SYongqiang Yang 44733afdcc5SYongqiang Yang /* This transaction may be extended/restarted along the way */ 44833afdcc5SYongqiang Yang handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); 44933afdcc5SYongqiang Yang if (IS_ERR(handle)) 45033afdcc5SYongqiang Yang return PTR_ERR(handle); 45133afdcc5SYongqiang Yang 45233afdcc5SYongqiang Yang group = group_data[0].group; 45333afdcc5SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group++) { 45433afdcc5SYongqiang Yang unsigned long gdblocks; 45533afdcc5SYongqiang Yang 45633afdcc5SYongqiang Yang gdblocks = ext4_bg_num_gdb(sb, group); 45733afdcc5SYongqiang Yang start = ext4_group_first_block_no(sb, group); 45833afdcc5SYongqiang Yang 45933afdcc5SYongqiang Yang /* Copy all of the GDT blocks into the backup in this group */ 46033afdcc5SYongqiang Yang for (j = 0, block = start + 1; j < gdblocks; j++, block++) { 46133afdcc5SYongqiang Yang struct buffer_head *gdb; 46233afdcc5SYongqiang Yang 46333afdcc5SYongqiang Yang ext4_debug("update backup group %#04llx\n", block); 46433afdcc5SYongqiang Yang err = extend_or_restart_transaction(handle, 1); 46533afdcc5SYongqiang Yang if (err) 46633afdcc5SYongqiang Yang goto out; 46733afdcc5SYongqiang Yang 46833afdcc5SYongqiang Yang gdb = sb_getblk(sb, block); 46933afdcc5SYongqiang Yang if (!gdb) { 47033afdcc5SYongqiang Yang err = -EIO; 47133afdcc5SYongqiang Yang goto out; 47233afdcc5SYongqiang Yang } 47333afdcc5SYongqiang Yang 47433afdcc5SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb); 47533afdcc5SYongqiang Yang if (err) { 47633afdcc5SYongqiang Yang brelse(gdb); 47733afdcc5SYongqiang Yang goto out; 47833afdcc5SYongqiang Yang } 47933afdcc5SYongqiang Yang memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, 48033afdcc5SYongqiang Yang gdb->b_size); 48133afdcc5SYongqiang Yang set_buffer_uptodate(gdb); 48233afdcc5SYongqiang Yang 48333afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb); 48433afdcc5SYongqiang Yang if (unlikely(err)) { 48533afdcc5SYongqiang Yang brelse(gdb); 48633afdcc5SYongqiang Yang goto out; 48733afdcc5SYongqiang Yang } 48833afdcc5SYongqiang Yang brelse(gdb); 48933afdcc5SYongqiang Yang } 49033afdcc5SYongqiang Yang 49133afdcc5SYongqiang Yang /* Zero out all of the reserved backup group descriptor 49233afdcc5SYongqiang Yang * table blocks 49333afdcc5SYongqiang Yang */ 49433afdcc5SYongqiang Yang if (ext4_bg_has_super(sb, group)) { 49533afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, gdblocks + start + 1, 49633afdcc5SYongqiang Yang reserved_gdb, GFP_NOFS); 49733afdcc5SYongqiang Yang if (err) 49833afdcc5SYongqiang Yang goto out; 49933afdcc5SYongqiang Yang } 50033afdcc5SYongqiang Yang 50133afdcc5SYongqiang Yang /* Initialize group tables of the grop @group */ 50233afdcc5SYongqiang Yang if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) 50333afdcc5SYongqiang Yang goto handle_bb; 50433afdcc5SYongqiang Yang 50533afdcc5SYongqiang Yang /* Zero out all of the inode table blocks */ 50633afdcc5SYongqiang Yang block = group_data[i].inode_table; 50733afdcc5SYongqiang Yang ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", 50833afdcc5SYongqiang Yang block, sbi->s_itb_per_group); 50933afdcc5SYongqiang Yang err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, 51033afdcc5SYongqiang Yang GFP_NOFS); 51133afdcc5SYongqiang Yang if (err) 51233afdcc5SYongqiang Yang goto out; 51333afdcc5SYongqiang Yang 51433afdcc5SYongqiang Yang handle_bb: 51533afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) 51633afdcc5SYongqiang Yang goto handle_ib; 51733afdcc5SYongqiang Yang 51833afdcc5SYongqiang Yang /* Initialize block bitmap of the @group */ 51933afdcc5SYongqiang Yang block = group_data[i].block_bitmap; 52033afdcc5SYongqiang Yang err = extend_or_restart_transaction(handle, 1); 52133afdcc5SYongqiang Yang if (err) 52233afdcc5SYongqiang Yang goto out; 52333afdcc5SYongqiang Yang 52433afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 52533afdcc5SYongqiang Yang if (IS_ERR(bh)) { 52633afdcc5SYongqiang Yang err = PTR_ERR(bh); 52733afdcc5SYongqiang Yang goto out; 52833afdcc5SYongqiang Yang } 52933afdcc5SYongqiang Yang if (ext4_bg_has_super(sb, group)) { 53033afdcc5SYongqiang Yang ext4_debug("mark backup superblock %#04llx (+0)\n", 53133afdcc5SYongqiang Yang start); 53233afdcc5SYongqiang Yang ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + 53333afdcc5SYongqiang Yang 1); 53433afdcc5SYongqiang Yang } 53533afdcc5SYongqiang Yang ext4_mark_bitmap_end(group_data[i].blocks_count, 53633afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 53733afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 53833afdcc5SYongqiang Yang if (err) 53933afdcc5SYongqiang Yang goto out; 54033afdcc5SYongqiang Yang brelse(bh); 54133afdcc5SYongqiang Yang 54233afdcc5SYongqiang Yang handle_ib: 54333afdcc5SYongqiang Yang if (bg_flags[i] & EXT4_BG_INODE_UNINIT) 54433afdcc5SYongqiang Yang continue; 54533afdcc5SYongqiang Yang 54633afdcc5SYongqiang Yang /* Initialize inode bitmap of the @group */ 54733afdcc5SYongqiang Yang block = group_data[i].inode_bitmap; 54833afdcc5SYongqiang Yang err = extend_or_restart_transaction(handle, 1); 54933afdcc5SYongqiang Yang if (err) 55033afdcc5SYongqiang Yang goto out; 55133afdcc5SYongqiang Yang /* Mark unused entries in inode bitmap used */ 55233afdcc5SYongqiang Yang bh = bclean(handle, sb, block); 55333afdcc5SYongqiang Yang if (IS_ERR(bh)) { 55433afdcc5SYongqiang Yang err = PTR_ERR(bh); 55533afdcc5SYongqiang Yang goto out; 55633afdcc5SYongqiang Yang } 55733afdcc5SYongqiang Yang 55833afdcc5SYongqiang Yang ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), 55933afdcc5SYongqiang Yang sb->s_blocksize * 8, bh->b_data); 56033afdcc5SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, bh); 56133afdcc5SYongqiang Yang if (err) 56233afdcc5SYongqiang Yang goto out; 56333afdcc5SYongqiang Yang brelse(bh); 56433afdcc5SYongqiang Yang } 56533afdcc5SYongqiang Yang bh = NULL; 56633afdcc5SYongqiang Yang 56733afdcc5SYongqiang Yang /* Mark group tables in block bitmap */ 56833afdcc5SYongqiang Yang for (j = 0; j < GROUP_TABLE_COUNT; j++) { 56933afdcc5SYongqiang Yang count = group_table_count[j]; 57033afdcc5SYongqiang Yang start = (&group_data[0].block_bitmap)[j]; 57133afdcc5SYongqiang Yang block = start; 57233afdcc5SYongqiang Yang for (i = 1; i < flex_gd->count; i++) { 57333afdcc5SYongqiang Yang block += group_table_count[j]; 57433afdcc5SYongqiang Yang if (block == (&group_data[i].block_bitmap)[j]) { 57533afdcc5SYongqiang Yang count += group_table_count[j]; 57633afdcc5SYongqiang Yang continue; 57733afdcc5SYongqiang Yang } 57833afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 57933afdcc5SYongqiang Yang flex_gd, start, count); 58033afdcc5SYongqiang Yang if (err) 58133afdcc5SYongqiang Yang goto out; 58233afdcc5SYongqiang Yang count = group_table_count[j]; 58333afdcc5SYongqiang Yang start = group_data[i].block_bitmap; 58433afdcc5SYongqiang Yang block = start; 58533afdcc5SYongqiang Yang } 58633afdcc5SYongqiang Yang 58733afdcc5SYongqiang Yang if (count) { 58833afdcc5SYongqiang Yang err = set_flexbg_block_bitmap(sb, handle, 58933afdcc5SYongqiang Yang flex_gd, start, count); 59033afdcc5SYongqiang Yang if (err) 59133afdcc5SYongqiang Yang goto out; 59233afdcc5SYongqiang Yang } 59333afdcc5SYongqiang Yang } 59433afdcc5SYongqiang Yang 59533afdcc5SYongqiang Yang out: 59633afdcc5SYongqiang Yang brelse(bh); 59733afdcc5SYongqiang Yang err2 = ext4_journal_stop(handle); 59833afdcc5SYongqiang Yang if (err2 && !err) 59933afdcc5SYongqiang Yang err = err2; 60033afdcc5SYongqiang Yang 60133afdcc5SYongqiang Yang return err; 60233afdcc5SYongqiang Yang } 60333afdcc5SYongqiang Yang 60433afdcc5SYongqiang Yang /* 605ac27a0ecSDave Kleikamp * Iterate through the groups which hold BACKUP superblock/GDT copies in an 606617ba13bSMingming Cao * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before 607ac27a0ecSDave Kleikamp * calling this for the first time. In a sparse filesystem it will be the 608ac27a0ecSDave Kleikamp * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... 609ac27a0ecSDave Kleikamp * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... 610ac27a0ecSDave Kleikamp */ 611617ba13bSMingming Cao static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, 612ac27a0ecSDave Kleikamp unsigned *five, unsigned *seven) 613ac27a0ecSDave Kleikamp { 614ac27a0ecSDave Kleikamp unsigned *min = three; 615ac27a0ecSDave Kleikamp int mult = 3; 616ac27a0ecSDave Kleikamp unsigned ret; 617ac27a0ecSDave Kleikamp 618617ba13bSMingming Cao if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 619617ba13bSMingming Cao EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { 620ac27a0ecSDave Kleikamp ret = *min; 621ac27a0ecSDave Kleikamp *min += 1; 622ac27a0ecSDave Kleikamp return ret; 623ac27a0ecSDave Kleikamp } 624ac27a0ecSDave Kleikamp 625ac27a0ecSDave Kleikamp if (*five < *min) { 626ac27a0ecSDave Kleikamp min = five; 627ac27a0ecSDave Kleikamp mult = 5; 628ac27a0ecSDave Kleikamp } 629ac27a0ecSDave Kleikamp if (*seven < *min) { 630ac27a0ecSDave Kleikamp min = seven; 631ac27a0ecSDave Kleikamp mult = 7; 632ac27a0ecSDave Kleikamp } 633ac27a0ecSDave Kleikamp 634ac27a0ecSDave Kleikamp ret = *min; 635ac27a0ecSDave Kleikamp *min *= mult; 636ac27a0ecSDave Kleikamp 637ac27a0ecSDave Kleikamp return ret; 638ac27a0ecSDave Kleikamp } 639ac27a0ecSDave Kleikamp 640ac27a0ecSDave Kleikamp /* 641ac27a0ecSDave Kleikamp * Check that all of the backup GDT blocks are held in the primary GDT block. 642ac27a0ecSDave Kleikamp * It is assumed that they are stored in group order. Returns the number of 643ac27a0ecSDave Kleikamp * groups in current filesystem that have BACKUPS, or -ve error code. 644ac27a0ecSDave Kleikamp */ 645ac27a0ecSDave Kleikamp static int verify_reserved_gdb(struct super_block *sb, 646c72df9f9SYongqiang Yang ext4_group_t end, 647ac27a0ecSDave Kleikamp struct buffer_head *primary) 648ac27a0ecSDave Kleikamp { 649617ba13bSMingming Cao const ext4_fsblk_t blk = primary->b_blocknr; 650ac27a0ecSDave Kleikamp unsigned three = 1; 651ac27a0ecSDave Kleikamp unsigned five = 5; 652ac27a0ecSDave Kleikamp unsigned seven = 7; 653ac27a0ecSDave Kleikamp unsigned grp; 654ac27a0ecSDave Kleikamp __le32 *p = (__le32 *)primary->b_data; 655ac27a0ecSDave Kleikamp int gdbackups = 0; 656ac27a0ecSDave Kleikamp 657617ba13bSMingming Cao while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { 658bd81d8eeSLaurent Vivier if (le32_to_cpu(*p++) != 659bd81d8eeSLaurent Vivier grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ 66012062dddSEric Sandeen ext4_warning(sb, "reserved GDT %llu" 6612ae02107SMingming Cao " missing grp %d (%llu)", 662ac27a0ecSDave Kleikamp blk, grp, 663bd81d8eeSLaurent Vivier grp * 664bd81d8eeSLaurent Vivier (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 665bd81d8eeSLaurent Vivier blk); 666ac27a0ecSDave Kleikamp return -EINVAL; 667ac27a0ecSDave Kleikamp } 668617ba13bSMingming Cao if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) 669ac27a0ecSDave Kleikamp return -EFBIG; 670ac27a0ecSDave Kleikamp } 671ac27a0ecSDave Kleikamp 672ac27a0ecSDave Kleikamp return gdbackups; 673ac27a0ecSDave Kleikamp } 674ac27a0ecSDave Kleikamp 675ac27a0ecSDave Kleikamp /* 676ac27a0ecSDave Kleikamp * Called when we need to bring a reserved group descriptor table block into 677ac27a0ecSDave Kleikamp * use from the resize inode. The primary copy of the new GDT block currently 678ac27a0ecSDave Kleikamp * is an indirect block (under the double indirect block in the resize inode). 679ac27a0ecSDave Kleikamp * The new backup GDT blocks will be stored as leaf blocks in this indirect 680ac27a0ecSDave Kleikamp * block, in group order. Even though we know all the block numbers we need, 681ac27a0ecSDave Kleikamp * we check to ensure that the resize inode has actually reserved these blocks. 682ac27a0ecSDave Kleikamp * 683ac27a0ecSDave Kleikamp * Don't need to update the block bitmaps because the blocks are still in use. 684ac27a0ecSDave Kleikamp * 685ac27a0ecSDave Kleikamp * We get all of the error cases out of the way, so that we are sure to not 686ac27a0ecSDave Kleikamp * fail once we start modifying the data on disk, because JBD has no rollback. 687ac27a0ecSDave Kleikamp */ 688ac27a0ecSDave Kleikamp static int add_new_gdb(handle_t *handle, struct inode *inode, 6892f919710SYongqiang Yang ext4_group_t group) 690ac27a0ecSDave Kleikamp { 691ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 692617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 6932f919710SYongqiang Yang unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 694617ba13bSMingming Cao ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; 695ac27a0ecSDave Kleikamp struct buffer_head **o_group_desc, **n_group_desc; 696ac27a0ecSDave Kleikamp struct buffer_head *dind; 6972f919710SYongqiang Yang struct buffer_head *gdb_bh; 698ac27a0ecSDave Kleikamp int gdbackups; 699617ba13bSMingming Cao struct ext4_iloc iloc; 700ac27a0ecSDave Kleikamp __le32 *data; 701ac27a0ecSDave Kleikamp int err; 702ac27a0ecSDave Kleikamp 703ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 704ac27a0ecSDave Kleikamp printk(KERN_DEBUG 705617ba13bSMingming Cao "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", 706ac27a0ecSDave Kleikamp gdb_num); 707ac27a0ecSDave Kleikamp 708ac27a0ecSDave Kleikamp /* 709ac27a0ecSDave Kleikamp * If we are not using the primary superblock/GDT copy don't resize, 710ac27a0ecSDave Kleikamp * because the user tools have no way of handling this. Probably a 711ac27a0ecSDave Kleikamp * bad time to do it anyways. 712ac27a0ecSDave Kleikamp */ 713617ba13bSMingming Cao if (EXT4_SB(sb)->s_sbh->b_blocknr != 714617ba13bSMingming Cao le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { 71512062dddSEric Sandeen ext4_warning(sb, "won't resize using backup superblock at %llu", 716617ba13bSMingming Cao (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); 717ac27a0ecSDave Kleikamp return -EPERM; 718ac27a0ecSDave Kleikamp } 719ac27a0ecSDave Kleikamp 7202f919710SYongqiang Yang gdb_bh = sb_bread(sb, gdblock); 7212f919710SYongqiang Yang if (!gdb_bh) 722ac27a0ecSDave Kleikamp return -EIO; 723ac27a0ecSDave Kleikamp 724c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, gdb_bh); 7252f919710SYongqiang Yang if (gdbackups < 0) { 726ac27a0ecSDave Kleikamp err = gdbackups; 727ac27a0ecSDave Kleikamp goto exit_bh; 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp 730617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 731ac27a0ecSDave Kleikamp dind = sb_bread(sb, le32_to_cpu(*data)); 732ac27a0ecSDave Kleikamp if (!dind) { 733ac27a0ecSDave Kleikamp err = -EIO; 734ac27a0ecSDave Kleikamp goto exit_bh; 735ac27a0ecSDave Kleikamp } 736ac27a0ecSDave Kleikamp 737ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 738617ba13bSMingming Cao if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { 73912062dddSEric Sandeen ext4_warning(sb, "new group %u GDT block %llu not reserved", 7402f919710SYongqiang Yang group, gdblock); 741ac27a0ecSDave Kleikamp err = -EINVAL; 742ac27a0ecSDave Kleikamp goto exit_dind; 743ac27a0ecSDave Kleikamp } 744ac27a0ecSDave Kleikamp 745b4097142STheodore Ts'o err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); 746b4097142STheodore Ts'o if (unlikely(err)) 747ac27a0ecSDave Kleikamp goto exit_dind; 748ac27a0ecSDave Kleikamp 7492f919710SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb_bh); 750b4097142STheodore Ts'o if (unlikely(err)) 751ac27a0ecSDave Kleikamp goto exit_sbh; 752ac27a0ecSDave Kleikamp 753b4097142STheodore Ts'o err = ext4_journal_get_write_access(handle, dind); 754b4097142STheodore Ts'o if (unlikely(err)) 755b4097142STheodore Ts'o ext4_std_error(sb, err); 756ac27a0ecSDave Kleikamp 757617ba13bSMingming Cao /* ext4_reserve_inode_write() gets a reference on the iloc */ 758b4097142STheodore Ts'o err = ext4_reserve_inode_write(handle, inode, &iloc); 759b4097142STheodore Ts'o if (unlikely(err)) 760ac27a0ecSDave Kleikamp goto exit_dindj; 761ac27a0ecSDave Kleikamp 762f18a5f21STheodore Ts'o n_group_desc = ext4_kvmalloc((gdb_num + 1) * 763f18a5f21STheodore Ts'o sizeof(struct buffer_head *), 764216553c4SJosef Bacik GFP_NOFS); 765ac27a0ecSDave Kleikamp if (!n_group_desc) { 766ac27a0ecSDave Kleikamp err = -ENOMEM; 767f18a5f21STheodore Ts'o ext4_warning(sb, "not enough memory for %lu groups", 768f18a5f21STheodore Ts'o gdb_num + 1); 769ac27a0ecSDave Kleikamp goto exit_inode; 770ac27a0ecSDave Kleikamp } 771ac27a0ecSDave Kleikamp 772ac27a0ecSDave Kleikamp /* 773ac27a0ecSDave Kleikamp * Finally, we have all of the possible failures behind us... 774ac27a0ecSDave Kleikamp * 775ac27a0ecSDave Kleikamp * Remove new GDT block from inode double-indirect block and clear out 776ac27a0ecSDave Kleikamp * the new GDT block for use (which also "frees" the backup GDT blocks 777ac27a0ecSDave Kleikamp * from the reserved inode). We don't need to change the bitmaps for 778ac27a0ecSDave Kleikamp * these blocks, because they are marked as in-use from being in the 779ac27a0ecSDave Kleikamp * reserved inode, and will become GDT blocks (primary and backup). 780ac27a0ecSDave Kleikamp */ 781617ba13bSMingming Cao data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; 782b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, dind); 783b4097142STheodore Ts'o if (unlikely(err)) { 784b4097142STheodore Ts'o ext4_std_error(sb, err); 785b4097142STheodore Ts'o goto exit_inode; 786b4097142STheodore Ts'o } 787ac27a0ecSDave Kleikamp inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; 788617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 7892f919710SYongqiang Yang memset(gdb_bh->b_data, 0, sb->s_blocksize); 7902f919710SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 791b4097142STheodore Ts'o if (unlikely(err)) { 792b4097142STheodore Ts'o ext4_std_error(sb, err); 793b4097142STheodore Ts'o goto exit_inode; 794b4097142STheodore Ts'o } 795b4097142STheodore Ts'o brelse(dind); 796ac27a0ecSDave Kleikamp 797617ba13bSMingming Cao o_group_desc = EXT4_SB(sb)->s_group_desc; 798ac27a0ecSDave Kleikamp memcpy(n_group_desc, o_group_desc, 799617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); 8002f919710SYongqiang Yang n_group_desc[gdb_num] = gdb_bh; 801617ba13bSMingming Cao EXT4_SB(sb)->s_group_desc = n_group_desc; 802617ba13bSMingming Cao EXT4_SB(sb)->s_gdb_count++; 803f18a5f21STheodore Ts'o ext4_kvfree(o_group_desc); 804ac27a0ecSDave Kleikamp 805e8546d06SMarcin Slusarz le16_add_cpu(&es->s_reserved_gdt_blocks, -1); 806b50924c2SArtem Bityutskiy err = ext4_handle_dirty_super(handle, sb); 807b4097142STheodore Ts'o if (err) 808b4097142STheodore Ts'o ext4_std_error(sb, err); 809ac27a0ecSDave Kleikamp 810b4097142STheodore Ts'o return err; 811ac27a0ecSDave Kleikamp 812ac27a0ecSDave Kleikamp exit_inode: 813f18a5f21STheodore Ts'o ext4_kvfree(n_group_desc); 814537a0310SAmir Goldstein /* ext4_handle_release_buffer(handle, iloc.bh); */ 815ac27a0ecSDave Kleikamp brelse(iloc.bh); 816ac27a0ecSDave Kleikamp exit_dindj: 817537a0310SAmir Goldstein /* ext4_handle_release_buffer(handle, dind); */ 818ac27a0ecSDave Kleikamp exit_sbh: 819537a0310SAmir Goldstein /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ 820ac27a0ecSDave Kleikamp exit_dind: 821ac27a0ecSDave Kleikamp brelse(dind); 822ac27a0ecSDave Kleikamp exit_bh: 8232f919710SYongqiang Yang brelse(gdb_bh); 824ac27a0ecSDave Kleikamp 825617ba13bSMingming Cao ext4_debug("leaving with error %d\n", err); 826ac27a0ecSDave Kleikamp return err; 827ac27a0ecSDave Kleikamp } 828ac27a0ecSDave Kleikamp 829ac27a0ecSDave Kleikamp /* 830ac27a0ecSDave Kleikamp * Called when we are adding a new group which has a backup copy of each of 831ac27a0ecSDave Kleikamp * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. 832ac27a0ecSDave Kleikamp * We need to add these reserved backup GDT blocks to the resize inode, so 833ac27a0ecSDave Kleikamp * that they are kept for future resizing and not allocated to files. 834ac27a0ecSDave Kleikamp * 835ac27a0ecSDave Kleikamp * Each reserved backup GDT block will go into a different indirect block. 836ac27a0ecSDave Kleikamp * The indirect blocks are actually the primary reserved GDT blocks, 837ac27a0ecSDave Kleikamp * so we know in advance what their block numbers are. We only get the 838ac27a0ecSDave Kleikamp * double-indirect block to verify it is pointing to the primary reserved 839ac27a0ecSDave Kleikamp * GDT blocks so we don't overwrite a data block by accident. The reserved 840ac27a0ecSDave Kleikamp * backup GDT blocks are stored in their reserved primary GDT block. 841ac27a0ecSDave Kleikamp */ 842ac27a0ecSDave Kleikamp static int reserve_backup_gdb(handle_t *handle, struct inode *inode, 843668f4dc5SYongqiang Yang ext4_group_t group) 844ac27a0ecSDave Kleikamp { 845ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 846617ba13bSMingming Cao int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); 847ac27a0ecSDave Kleikamp struct buffer_head **primary; 848ac27a0ecSDave Kleikamp struct buffer_head *dind; 849617ba13bSMingming Cao struct ext4_iloc iloc; 850617ba13bSMingming Cao ext4_fsblk_t blk; 851ac27a0ecSDave Kleikamp __le32 *data, *end; 852ac27a0ecSDave Kleikamp int gdbackups = 0; 853ac27a0ecSDave Kleikamp int res, i; 854ac27a0ecSDave Kleikamp int err; 855ac27a0ecSDave Kleikamp 856216553c4SJosef Bacik primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); 857ac27a0ecSDave Kleikamp if (!primary) 858ac27a0ecSDave Kleikamp return -ENOMEM; 859ac27a0ecSDave Kleikamp 860617ba13bSMingming Cao data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; 861ac27a0ecSDave Kleikamp dind = sb_bread(sb, le32_to_cpu(*data)); 862ac27a0ecSDave Kleikamp if (!dind) { 863ac27a0ecSDave Kleikamp err = -EIO; 864ac27a0ecSDave Kleikamp goto exit_free; 865ac27a0ecSDave Kleikamp } 866ac27a0ecSDave Kleikamp 867617ba13bSMingming Cao blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; 86894460093SJosef Bacik data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % 86994460093SJosef Bacik EXT4_ADDR_PER_BLOCK(sb)); 870617ba13bSMingming Cao end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); 871ac27a0ecSDave Kleikamp 872ac27a0ecSDave Kleikamp /* Get each reserved primary GDT block and verify it holds backups */ 873ac27a0ecSDave Kleikamp for (res = 0; res < reserved_gdb; res++, blk++) { 874ac27a0ecSDave Kleikamp if (le32_to_cpu(*data) != blk) { 87512062dddSEric Sandeen ext4_warning(sb, "reserved block %llu" 876ac27a0ecSDave Kleikamp " not at offset %ld", 877ac27a0ecSDave Kleikamp blk, 878ac27a0ecSDave Kleikamp (long)(data - (__le32 *)dind->b_data)); 879ac27a0ecSDave Kleikamp err = -EINVAL; 880ac27a0ecSDave Kleikamp goto exit_bh; 881ac27a0ecSDave Kleikamp } 882ac27a0ecSDave Kleikamp primary[res] = sb_bread(sb, blk); 883ac27a0ecSDave Kleikamp if (!primary[res]) { 884ac27a0ecSDave Kleikamp err = -EIO; 885ac27a0ecSDave Kleikamp goto exit_bh; 886ac27a0ecSDave Kleikamp } 887c72df9f9SYongqiang Yang gdbackups = verify_reserved_gdb(sb, group, primary[res]); 888c72df9f9SYongqiang Yang if (gdbackups < 0) { 889ac27a0ecSDave Kleikamp brelse(primary[res]); 890ac27a0ecSDave Kleikamp err = gdbackups; 891ac27a0ecSDave Kleikamp goto exit_bh; 892ac27a0ecSDave Kleikamp } 893ac27a0ecSDave Kleikamp if (++data >= end) 894ac27a0ecSDave Kleikamp data = (__le32 *)dind->b_data; 895ac27a0ecSDave Kleikamp } 896ac27a0ecSDave Kleikamp 897ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 898617ba13bSMingming Cao if ((err = ext4_journal_get_write_access(handle, primary[i]))) { 899ac27a0ecSDave Kleikamp /* 900ac27a0ecSDave Kleikamp int j; 901ac27a0ecSDave Kleikamp for (j = 0; j < i; j++) 902537a0310SAmir Goldstein ext4_handle_release_buffer(handle, primary[j]); 903ac27a0ecSDave Kleikamp */ 904ac27a0ecSDave Kleikamp goto exit_bh; 905ac27a0ecSDave Kleikamp } 906ac27a0ecSDave Kleikamp } 907ac27a0ecSDave Kleikamp 908617ba13bSMingming Cao if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) 909ac27a0ecSDave Kleikamp goto exit_bh; 910ac27a0ecSDave Kleikamp 911ac27a0ecSDave Kleikamp /* 912ac27a0ecSDave Kleikamp * Finally we can add each of the reserved backup GDT blocks from 913ac27a0ecSDave Kleikamp * the new group to its reserved primary GDT block. 914ac27a0ecSDave Kleikamp */ 915668f4dc5SYongqiang Yang blk = group * EXT4_BLOCKS_PER_GROUP(sb); 916ac27a0ecSDave Kleikamp for (i = 0; i < reserved_gdb; i++) { 917ac27a0ecSDave Kleikamp int err2; 918ac27a0ecSDave Kleikamp data = (__le32 *)primary[i]->b_data; 919ac27a0ecSDave Kleikamp /* printk("reserving backup %lu[%u] = %lu\n", 920ac27a0ecSDave Kleikamp primary[i]->b_blocknr, gdbackups, 921ac27a0ecSDave Kleikamp blk + primary[i]->b_blocknr); */ 922ac27a0ecSDave Kleikamp data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); 9230390131bSFrank Mayhar err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); 924ac27a0ecSDave Kleikamp if (!err) 925ac27a0ecSDave Kleikamp err = err2; 926ac27a0ecSDave Kleikamp } 927ac27a0ecSDave Kleikamp inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; 928617ba13bSMingming Cao ext4_mark_iloc_dirty(handle, inode, &iloc); 929ac27a0ecSDave Kleikamp 930ac27a0ecSDave Kleikamp exit_bh: 931ac27a0ecSDave Kleikamp while (--res >= 0) 932ac27a0ecSDave Kleikamp brelse(primary[res]); 933ac27a0ecSDave Kleikamp brelse(dind); 934ac27a0ecSDave Kleikamp 935ac27a0ecSDave Kleikamp exit_free: 936ac27a0ecSDave Kleikamp kfree(primary); 937ac27a0ecSDave Kleikamp 938ac27a0ecSDave Kleikamp return err; 939ac27a0ecSDave Kleikamp } 940ac27a0ecSDave Kleikamp 941ac27a0ecSDave Kleikamp /* 942617ba13bSMingming Cao * Update the backup copies of the ext4 metadata. These don't need to be part 943ac27a0ecSDave Kleikamp * of the main resize transaction, because e2fsck will re-write them if there 944ac27a0ecSDave Kleikamp * is a problem (basically only OOM will cause a problem). However, we 945ac27a0ecSDave Kleikamp * _should_ update the backups if possible, in case the primary gets trashed 946ac27a0ecSDave Kleikamp * for some reason and we need to run e2fsck from a backup superblock. The 947ac27a0ecSDave Kleikamp * important part is that the new block and inode counts are in the backup 948ac27a0ecSDave Kleikamp * superblocks, and the location of the new group metadata in the GDT backups. 949ac27a0ecSDave Kleikamp * 95032ed5058STheodore Ts'o * We do not need take the s_resize_lock for this, because these 95132ed5058STheodore Ts'o * blocks are not otherwise touched by the filesystem code when it is 95232ed5058STheodore Ts'o * mounted. We don't need to worry about last changing from 95332ed5058STheodore Ts'o * sbi->s_groups_count, because the worst that can happen is that we 95432ed5058STheodore Ts'o * do not copy the full number of backups at this time. The resize 95532ed5058STheodore Ts'o * which changed s_groups_count will backup again. 956ac27a0ecSDave Kleikamp */ 957ac27a0ecSDave Kleikamp static void update_backups(struct super_block *sb, 958ac27a0ecSDave Kleikamp int blk_off, char *data, int size) 959ac27a0ecSDave Kleikamp { 960617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 961fd2d4291SAvantika Mathur const ext4_group_t last = sbi->s_groups_count; 962617ba13bSMingming Cao const int bpg = EXT4_BLOCKS_PER_GROUP(sb); 963ac27a0ecSDave Kleikamp unsigned three = 1; 964ac27a0ecSDave Kleikamp unsigned five = 5; 965ac27a0ecSDave Kleikamp unsigned seven = 7; 966fd2d4291SAvantika Mathur ext4_group_t group; 967ac27a0ecSDave Kleikamp int rest = sb->s_blocksize - size; 968ac27a0ecSDave Kleikamp handle_t *handle; 969ac27a0ecSDave Kleikamp int err = 0, err2; 970ac27a0ecSDave Kleikamp 971617ba13bSMingming Cao handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); 972ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 973ac27a0ecSDave Kleikamp group = 1; 974ac27a0ecSDave Kleikamp err = PTR_ERR(handle); 975ac27a0ecSDave Kleikamp goto exit_err; 976ac27a0ecSDave Kleikamp } 977ac27a0ecSDave Kleikamp 978a9c47317SDarrick J. Wong ext4_superblock_csum_set(sb, (struct ext4_super_block *)data); 979a9c47317SDarrick J. Wong 980617ba13bSMingming Cao while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { 981ac27a0ecSDave Kleikamp struct buffer_head *bh; 982ac27a0ecSDave Kleikamp 983ac27a0ecSDave Kleikamp /* Out of journal space, and can't get more - abort - so sad */ 9840390131bSFrank Mayhar if (ext4_handle_valid(handle) && 9850390131bSFrank Mayhar handle->h_buffer_credits == 0 && 986617ba13bSMingming Cao ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && 987617ba13bSMingming Cao (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) 988ac27a0ecSDave Kleikamp break; 989ac27a0ecSDave Kleikamp 990ac27a0ecSDave Kleikamp bh = sb_getblk(sb, group * bpg + blk_off); 991ac27a0ecSDave Kleikamp if (!bh) { 992ac27a0ecSDave Kleikamp err = -EIO; 993ac27a0ecSDave Kleikamp break; 994ac27a0ecSDave Kleikamp } 995617ba13bSMingming Cao ext4_debug("update metadata backup %#04lx\n", 996ac27a0ecSDave Kleikamp (unsigned long)bh->b_blocknr); 997617ba13bSMingming Cao if ((err = ext4_journal_get_write_access(handle, bh))) 998ac27a0ecSDave Kleikamp break; 999ac27a0ecSDave Kleikamp lock_buffer(bh); 1000ac27a0ecSDave Kleikamp memcpy(bh->b_data, data, size); 1001ac27a0ecSDave Kleikamp if (rest) 1002ac27a0ecSDave Kleikamp memset(bh->b_data + size, 0, rest); 1003ac27a0ecSDave Kleikamp set_buffer_uptodate(bh); 1004ac27a0ecSDave Kleikamp unlock_buffer(bh); 1005b4097142STheodore Ts'o err = ext4_handle_dirty_metadata(handle, NULL, bh); 1006b4097142STheodore Ts'o if (unlikely(err)) 1007b4097142STheodore Ts'o ext4_std_error(sb, err); 1008ac27a0ecSDave Kleikamp brelse(bh); 1009ac27a0ecSDave Kleikamp } 1010617ba13bSMingming Cao if ((err2 = ext4_journal_stop(handle)) && !err) 1011ac27a0ecSDave Kleikamp err = err2; 1012ac27a0ecSDave Kleikamp 1013ac27a0ecSDave Kleikamp /* 1014ac27a0ecSDave Kleikamp * Ugh! Need to have e2fsck write the backup copies. It is too 1015ac27a0ecSDave Kleikamp * late to revert the resize, we shouldn't fail just because of 1016ac27a0ecSDave Kleikamp * the backup copies (they are only needed in case of corruption). 1017ac27a0ecSDave Kleikamp * 1018ac27a0ecSDave Kleikamp * However, if we got here we have a journal problem too, so we 1019ac27a0ecSDave Kleikamp * can't really start a transaction to mark the superblock. 1020ac27a0ecSDave Kleikamp * Chicken out and just set the flag on the hope it will be written 1021ac27a0ecSDave Kleikamp * to disk, and if not - we will simply wait until next fsck. 1022ac27a0ecSDave Kleikamp */ 1023ac27a0ecSDave Kleikamp exit_err: 1024ac27a0ecSDave Kleikamp if (err) { 102512062dddSEric Sandeen ext4_warning(sb, "can't update backup for group %u (err %d), " 1026ac27a0ecSDave Kleikamp "forcing fsck on next reboot", group, err); 1027617ba13bSMingming Cao sbi->s_mount_state &= ~EXT4_VALID_FS; 1028617ba13bSMingming Cao sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1029ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 1030ac27a0ecSDave Kleikamp } 1031ac27a0ecSDave Kleikamp } 1032ac27a0ecSDave Kleikamp 1033bb08c1e7SYongqiang Yang /* 1034bb08c1e7SYongqiang Yang * ext4_add_new_descs() adds @count group descriptor of groups 1035bb08c1e7SYongqiang Yang * starting at @group 1036bb08c1e7SYongqiang Yang * 1037bb08c1e7SYongqiang Yang * @handle: journal handle 1038bb08c1e7SYongqiang Yang * @sb: super block 1039bb08c1e7SYongqiang Yang * @group: the group no. of the first group desc to be added 1040bb08c1e7SYongqiang Yang * @resize_inode: the resize inode 1041bb08c1e7SYongqiang Yang * @count: number of group descriptors to be added 1042bb08c1e7SYongqiang Yang */ 1043bb08c1e7SYongqiang Yang static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, 1044bb08c1e7SYongqiang Yang ext4_group_t group, struct inode *resize_inode, 1045bb08c1e7SYongqiang Yang ext4_group_t count) 1046bb08c1e7SYongqiang Yang { 1047bb08c1e7SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1048bb08c1e7SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 1049bb08c1e7SYongqiang Yang struct buffer_head *gdb_bh; 1050bb08c1e7SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1051bb08c1e7SYongqiang Yang 1052bb08c1e7SYongqiang Yang for (i = 0; i < count; i++, group++) { 1053bb08c1e7SYongqiang Yang int reserved_gdb = ext4_bg_has_super(sb, group) ? 1054bb08c1e7SYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1055bb08c1e7SYongqiang Yang 1056bb08c1e7SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1057bb08c1e7SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1058bb08c1e7SYongqiang Yang 1059bb08c1e7SYongqiang Yang /* 1060bb08c1e7SYongqiang Yang * We will only either add reserved group blocks to a backup group 1061bb08c1e7SYongqiang Yang * or remove reserved blocks for the first group in a new group block. 1062bb08c1e7SYongqiang Yang * Doing both would be mean more complex code, and sane people don't 1063bb08c1e7SYongqiang Yang * use non-sparse filesystems anymore. This is already checked above. 1064bb08c1e7SYongqiang Yang */ 1065bb08c1e7SYongqiang Yang if (gdb_off) { 1066bb08c1e7SYongqiang Yang gdb_bh = sbi->s_group_desc[gdb_num]; 1067bb08c1e7SYongqiang Yang err = ext4_journal_get_write_access(handle, gdb_bh); 1068bb08c1e7SYongqiang Yang 1069bb08c1e7SYongqiang Yang if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) 1070bb08c1e7SYongqiang Yang err = reserve_backup_gdb(handle, resize_inode, group); 1071bb08c1e7SYongqiang Yang } else 1072bb08c1e7SYongqiang Yang err = add_new_gdb(handle, resize_inode, group); 1073bb08c1e7SYongqiang Yang if (err) 1074bb08c1e7SYongqiang Yang break; 1075bb08c1e7SYongqiang Yang } 1076bb08c1e7SYongqiang Yang return err; 1077bb08c1e7SYongqiang Yang } 1078bb08c1e7SYongqiang Yang 107941a246d1SDarrick J. Wong static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 108041a246d1SDarrick J. Wong { 108141a246d1SDarrick J. Wong struct buffer_head *bh = sb_getblk(sb, block); 108241a246d1SDarrick J. Wong if (!bh) 108341a246d1SDarrick J. Wong return NULL; 108441a246d1SDarrick J. Wong 108541a246d1SDarrick J. Wong if (bitmap_uptodate(bh)) 108641a246d1SDarrick J. Wong return bh; 108741a246d1SDarrick J. Wong 108841a246d1SDarrick J. Wong lock_buffer(bh); 108941a246d1SDarrick J. Wong if (bh_submit_read(bh) < 0) { 109041a246d1SDarrick J. Wong unlock_buffer(bh); 109141a246d1SDarrick J. Wong brelse(bh); 109241a246d1SDarrick J. Wong return NULL; 109341a246d1SDarrick J. Wong } 109441a246d1SDarrick J. Wong unlock_buffer(bh); 109541a246d1SDarrick J. Wong 109641a246d1SDarrick J. Wong return bh; 109741a246d1SDarrick J. Wong } 109841a246d1SDarrick J. Wong 109941a246d1SDarrick J. Wong static int ext4_set_bitmap_checksums(struct super_block *sb, 110041a246d1SDarrick J. Wong ext4_group_t group, 110141a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 110241a246d1SDarrick J. Wong struct ext4_new_group_data *group_data) 110341a246d1SDarrick J. Wong { 110441a246d1SDarrick J. Wong struct buffer_head *bh; 110541a246d1SDarrick J. Wong 110641a246d1SDarrick J. Wong if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 110741a246d1SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 110841a246d1SDarrick J. Wong return 0; 110941a246d1SDarrick J. Wong 111041a246d1SDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->inode_bitmap); 111141a246d1SDarrick J. Wong if (!bh) 111241a246d1SDarrick J. Wong return -EIO; 111341a246d1SDarrick J. Wong ext4_inode_bitmap_csum_set(sb, group, gdp, bh, 111441a246d1SDarrick J. Wong EXT4_INODES_PER_GROUP(sb) / 8); 111541a246d1SDarrick J. Wong brelse(bh); 111641a246d1SDarrick J. Wong 1117fa77dcfaSDarrick J. Wong bh = ext4_get_bitmap(sb, group_data->block_bitmap); 1118fa77dcfaSDarrick J. Wong if (!bh) 1119fa77dcfaSDarrick J. Wong return -EIO; 1120fa77dcfaSDarrick J. Wong ext4_block_bitmap_csum_set(sb, group, gdp, bh, 1121fa77dcfaSDarrick J. Wong EXT4_BLOCKS_PER_GROUP(sb) / 8); 1122fa77dcfaSDarrick J. Wong brelse(bh); 1123fa77dcfaSDarrick J. Wong 112441a246d1SDarrick J. Wong return 0; 112541a246d1SDarrick J. Wong } 112641a246d1SDarrick J. Wong 1127083f5b24SYongqiang Yang /* 1128083f5b24SYongqiang Yang * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg 1129083f5b24SYongqiang Yang */ 1130083f5b24SYongqiang Yang static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, 1131083f5b24SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 1132083f5b24SYongqiang Yang { 1133083f5b24SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 1134083f5b24SYongqiang Yang struct ext4_group_desc *gdp; 1135083f5b24SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 1136083f5b24SYongqiang Yang struct buffer_head *gdb_bh; 1137083f5b24SYongqiang Yang ext4_group_t group; 1138083f5b24SYongqiang Yang __u16 *bg_flags = flex_gd->bg_flags; 1139083f5b24SYongqiang Yang int i, gdb_off, gdb_num, err = 0; 1140083f5b24SYongqiang Yang 1141083f5b24SYongqiang Yang 1142083f5b24SYongqiang Yang for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { 1143083f5b24SYongqiang Yang group = group_data->group; 1144083f5b24SYongqiang Yang 1145083f5b24SYongqiang Yang gdb_off = group % EXT4_DESC_PER_BLOCK(sb); 1146083f5b24SYongqiang Yang gdb_num = group / EXT4_DESC_PER_BLOCK(sb); 1147083f5b24SYongqiang Yang 1148083f5b24SYongqiang Yang /* 1149083f5b24SYongqiang Yang * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). 1150083f5b24SYongqiang Yang */ 1151083f5b24SYongqiang Yang gdb_bh = sbi->s_group_desc[gdb_num]; 1152083f5b24SYongqiang Yang /* Update group descriptor block for new group */ 11532716b802STheodore Ts'o gdp = (struct ext4_group_desc *)(gdb_bh->b_data + 1154083f5b24SYongqiang Yang gdb_off * EXT4_DESC_SIZE(sb)); 1155083f5b24SYongqiang Yang 1156083f5b24SYongqiang Yang memset(gdp, 0, EXT4_DESC_SIZE(sb)); 1157083f5b24SYongqiang Yang ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); 1158083f5b24SYongqiang Yang ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); 115941a246d1SDarrick J. Wong err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); 116041a246d1SDarrick J. Wong if (err) { 116141a246d1SDarrick J. Wong ext4_std_error(sb, err); 116241a246d1SDarrick J. Wong break; 116341a246d1SDarrick J. Wong } 116441a246d1SDarrick J. Wong 1165083f5b24SYongqiang Yang ext4_inode_table_set(sb, gdp, group_data->inode_table); 1166083f5b24SYongqiang Yang ext4_free_group_clusters_set(sb, gdp, 1167083f5b24SYongqiang Yang EXT4_B2C(sbi, group_data->free_blocks_count)); 1168083f5b24SYongqiang Yang ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); 1169083f5b24SYongqiang Yang gdp->bg_flags = cpu_to_le16(*bg_flags); 1170feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, group, gdp); 1171083f5b24SYongqiang Yang 1172083f5b24SYongqiang Yang err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); 1173083f5b24SYongqiang Yang if (unlikely(err)) { 1174083f5b24SYongqiang Yang ext4_std_error(sb, err); 1175083f5b24SYongqiang Yang break; 1176083f5b24SYongqiang Yang } 1177083f5b24SYongqiang Yang 1178083f5b24SYongqiang Yang /* 1179083f5b24SYongqiang Yang * We can allocate memory for mb_alloc based on the new group 1180083f5b24SYongqiang Yang * descriptor 1181083f5b24SYongqiang Yang */ 1182083f5b24SYongqiang Yang err = ext4_mb_add_groupinfo(sb, group, gdp); 1183083f5b24SYongqiang Yang if (err) 1184083f5b24SYongqiang Yang break; 1185083f5b24SYongqiang Yang } 1186083f5b24SYongqiang Yang return err; 1187083f5b24SYongqiang Yang } 1188083f5b24SYongqiang Yang 11892e10e2f2SYongqiang Yang /* 11902e10e2f2SYongqiang Yang * ext4_update_super() updates the super block so that the newly added 11912e10e2f2SYongqiang Yang * groups can be seen by the filesystem. 11922e10e2f2SYongqiang Yang * 11932e10e2f2SYongqiang Yang * @sb: super block 11942e10e2f2SYongqiang Yang * @flex_gd: new added groups 11952e10e2f2SYongqiang Yang */ 11962e10e2f2SYongqiang Yang static void ext4_update_super(struct super_block *sb, 11972e10e2f2SYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 11982e10e2f2SYongqiang Yang { 11992e10e2f2SYongqiang Yang ext4_fsblk_t blocks_count = 0; 12002e10e2f2SYongqiang Yang ext4_fsblk_t free_blocks = 0; 12012e10e2f2SYongqiang Yang ext4_fsblk_t reserved_blocks = 0; 12022e10e2f2SYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 12032e10e2f2SYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 12042e10e2f2SYongqiang Yang struct ext4_super_block *es = sbi->s_es; 12058a991849STheodore Ts'o int i; 12062e10e2f2SYongqiang Yang 12072e10e2f2SYongqiang Yang BUG_ON(flex_gd->count == 0 || group_data == NULL); 12082e10e2f2SYongqiang Yang /* 12092e10e2f2SYongqiang Yang * Make the new blocks and inodes valid next. We do this before 12102e10e2f2SYongqiang Yang * increasing the group count so that once the group is enabled, 12112e10e2f2SYongqiang Yang * all of its blocks and inodes are already valid. 12122e10e2f2SYongqiang Yang * 12132e10e2f2SYongqiang Yang * We always allocate group-by-group, then block-by-block or 12142e10e2f2SYongqiang Yang * inode-by-inode within a group, so enabling these 12152e10e2f2SYongqiang Yang * blocks/inodes before the group is live won't actually let us 12162e10e2f2SYongqiang Yang * allocate the new space yet. 12172e10e2f2SYongqiang Yang */ 12182e10e2f2SYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 12192e10e2f2SYongqiang Yang blocks_count += group_data[i].blocks_count; 12202e10e2f2SYongqiang Yang free_blocks += group_data[i].free_blocks_count; 12212e10e2f2SYongqiang Yang } 12222e10e2f2SYongqiang Yang 12232e10e2f2SYongqiang Yang reserved_blocks = ext4_r_blocks_count(es) * 100; 12242e10e2f2SYongqiang Yang do_div(reserved_blocks, ext4_blocks_count(es)); 12252e10e2f2SYongqiang Yang reserved_blocks *= blocks_count; 12262e10e2f2SYongqiang Yang do_div(reserved_blocks, 100); 12272e10e2f2SYongqiang Yang 12282e10e2f2SYongqiang Yang ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); 1229636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); 12302e10e2f2SYongqiang Yang le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * 12312e10e2f2SYongqiang Yang flex_gd->count); 1232636d7e2eSDarrick J. Wong le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * 1233636d7e2eSDarrick J. Wong flex_gd->count); 12342e10e2f2SYongqiang Yang 12352e10e2f2SYongqiang Yang /* 12362e10e2f2SYongqiang Yang * We need to protect s_groups_count against other CPUs seeing 12372e10e2f2SYongqiang Yang * inconsistent state in the superblock. 12382e10e2f2SYongqiang Yang * 12392e10e2f2SYongqiang Yang * The precise rules we use are: 12402e10e2f2SYongqiang Yang * 12412e10e2f2SYongqiang Yang * * Writers must perform a smp_wmb() after updating all 12422e10e2f2SYongqiang Yang * dependent data and before modifying the groups count 12432e10e2f2SYongqiang Yang * 12442e10e2f2SYongqiang Yang * * Readers must perform an smp_rmb() after reading the groups 12452e10e2f2SYongqiang Yang * count and before reading any dependent data. 12462e10e2f2SYongqiang Yang * 12472e10e2f2SYongqiang Yang * NB. These rules can be relaxed when checking the group count 12482e10e2f2SYongqiang Yang * while freeing data, as we can only allocate from a block 12492e10e2f2SYongqiang Yang * group after serialising against the group count, and we can 12502e10e2f2SYongqiang Yang * only then free after serialising in turn against that 12512e10e2f2SYongqiang Yang * allocation. 12522e10e2f2SYongqiang Yang */ 12532e10e2f2SYongqiang Yang smp_wmb(); 12542e10e2f2SYongqiang Yang 12552e10e2f2SYongqiang Yang /* Update the global fs size fields */ 12562e10e2f2SYongqiang Yang sbi->s_groups_count += flex_gd->count; 12572e10e2f2SYongqiang Yang 12582e10e2f2SYongqiang Yang /* Update the reserved block counts only once the new group is 12592e10e2f2SYongqiang Yang * active. */ 12602e10e2f2SYongqiang Yang ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + 12612e10e2f2SYongqiang Yang reserved_blocks); 12622e10e2f2SYongqiang Yang 12632e10e2f2SYongqiang Yang /* Update the free space counts */ 12642e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeclusters_counter, 12652e10e2f2SYongqiang Yang EXT4_B2C(sbi, free_blocks)); 12662e10e2f2SYongqiang Yang percpu_counter_add(&sbi->s_freeinodes_counter, 12672e10e2f2SYongqiang Yang EXT4_INODES_PER_GROUP(sb) * flex_gd->count); 12682e10e2f2SYongqiang Yang 12692e10e2f2SYongqiang Yang if (EXT4_HAS_INCOMPAT_FEATURE(sb, 12702e10e2f2SYongqiang Yang EXT4_FEATURE_INCOMPAT_FLEX_BG) && 12712e10e2f2SYongqiang Yang sbi->s_log_groups_per_flex) { 12722e10e2f2SYongqiang Yang ext4_group_t flex_group; 12732e10e2f2SYongqiang Yang flex_group = ext4_flex_group(sbi, group_data[0].group); 12742e10e2f2SYongqiang Yang atomic_add(EXT4_B2C(sbi, free_blocks), 12752e10e2f2SYongqiang Yang &sbi->s_flex_groups[flex_group].free_clusters); 12762e10e2f2SYongqiang Yang atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, 12772e10e2f2SYongqiang Yang &sbi->s_flex_groups[flex_group].free_inodes); 12782e10e2f2SYongqiang Yang } 12792e10e2f2SYongqiang Yang 1280952fc18eSTheodore Ts'o /* 1281952fc18eSTheodore Ts'o * Update the fs overhead information 1282952fc18eSTheodore Ts'o */ 1283952fc18eSTheodore Ts'o ext4_calculate_overhead(sb); 1284952fc18eSTheodore Ts'o 12852e10e2f2SYongqiang Yang if (test_opt(sb, DEBUG)) 12862e10e2f2SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: added group %u:" 12872e10e2f2SYongqiang Yang "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, 12882e10e2f2SYongqiang Yang blocks_count, free_blocks, reserved_blocks); 12892e10e2f2SYongqiang Yang } 12902e10e2f2SYongqiang Yang 12914bac1f8cSYongqiang Yang /* Add a flex group to an fs. Ensure we handle all possible error conditions 12924bac1f8cSYongqiang Yang * _before_ we start modifying the filesystem, because we cannot abort the 12934bac1f8cSYongqiang Yang * transaction and not have it write the data to disk. 12944bac1f8cSYongqiang Yang */ 12954bac1f8cSYongqiang Yang static int ext4_flex_group_add(struct super_block *sb, 12964bac1f8cSYongqiang Yang struct inode *resize_inode, 12974bac1f8cSYongqiang Yang struct ext4_new_flex_group_data *flex_gd) 12984bac1f8cSYongqiang Yang { 12994bac1f8cSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 13004bac1f8cSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 13014bac1f8cSYongqiang Yang ext4_fsblk_t o_blocks_count; 13024bac1f8cSYongqiang Yang ext4_grpblk_t last; 13034bac1f8cSYongqiang Yang ext4_group_t group; 13044bac1f8cSYongqiang Yang handle_t *handle; 13054bac1f8cSYongqiang Yang unsigned reserved_gdb; 13064bac1f8cSYongqiang Yang int err = 0, err2 = 0, credit; 13074bac1f8cSYongqiang Yang 13084bac1f8cSYongqiang Yang BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); 13094bac1f8cSYongqiang Yang 13104bac1f8cSYongqiang Yang reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); 13114bac1f8cSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 13124bac1f8cSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 13134bac1f8cSYongqiang Yang BUG_ON(last); 13144bac1f8cSYongqiang Yang 13154bac1f8cSYongqiang Yang err = setup_new_flex_group_blocks(sb, flex_gd); 13164bac1f8cSYongqiang Yang if (err) 13174bac1f8cSYongqiang Yang goto exit; 13184bac1f8cSYongqiang Yang /* 13194bac1f8cSYongqiang Yang * We will always be modifying at least the superblock and GDT 13204bac1f8cSYongqiang Yang * block. If we are adding a group past the last current GDT block, 13214bac1f8cSYongqiang Yang * we will also modify the inode and the dindirect block. If we 13224bac1f8cSYongqiang Yang * are adding a group with superblock/GDT backups we will also 13234bac1f8cSYongqiang Yang * modify each of the reserved GDT dindirect blocks. 13244bac1f8cSYongqiang Yang */ 13254bac1f8cSYongqiang Yang credit = flex_gd->count * 4 + reserved_gdb; 13264bac1f8cSYongqiang Yang handle = ext4_journal_start_sb(sb, credit); 13274bac1f8cSYongqiang Yang if (IS_ERR(handle)) { 13284bac1f8cSYongqiang Yang err = PTR_ERR(handle); 13294bac1f8cSYongqiang Yang goto exit; 13304bac1f8cSYongqiang Yang } 13314bac1f8cSYongqiang Yang 13324bac1f8cSYongqiang Yang err = ext4_journal_get_write_access(handle, sbi->s_sbh); 13334bac1f8cSYongqiang Yang if (err) 13344bac1f8cSYongqiang Yang goto exit_journal; 13354bac1f8cSYongqiang Yang 13364bac1f8cSYongqiang Yang group = flex_gd->groups[0].group; 13374bac1f8cSYongqiang Yang BUG_ON(group != EXT4_SB(sb)->s_groups_count); 13384bac1f8cSYongqiang Yang err = ext4_add_new_descs(handle, sb, group, 13394bac1f8cSYongqiang Yang resize_inode, flex_gd->count); 13404bac1f8cSYongqiang Yang if (err) 13414bac1f8cSYongqiang Yang goto exit_journal; 13424bac1f8cSYongqiang Yang 13434bac1f8cSYongqiang Yang err = ext4_setup_new_descs(handle, sb, flex_gd); 13444bac1f8cSYongqiang Yang if (err) 13454bac1f8cSYongqiang Yang goto exit_journal; 13464bac1f8cSYongqiang Yang 13474bac1f8cSYongqiang Yang ext4_update_super(sb, flex_gd); 13484bac1f8cSYongqiang Yang 13494bac1f8cSYongqiang Yang err = ext4_handle_dirty_super(handle, sb); 13504bac1f8cSYongqiang Yang 13514bac1f8cSYongqiang Yang exit_journal: 13524bac1f8cSYongqiang Yang err2 = ext4_journal_stop(handle); 13534bac1f8cSYongqiang Yang if (!err) 13544bac1f8cSYongqiang Yang err = err2; 13554bac1f8cSYongqiang Yang 13564bac1f8cSYongqiang Yang if (!err) { 13574bac1f8cSYongqiang Yang int i; 13584bac1f8cSYongqiang Yang update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, 13594bac1f8cSYongqiang Yang sizeof(struct ext4_super_block)); 13604bac1f8cSYongqiang Yang for (i = 0; i < flex_gd->count; i++, group++) { 13614bac1f8cSYongqiang Yang struct buffer_head *gdb_bh; 13624bac1f8cSYongqiang Yang int gdb_num; 13634bac1f8cSYongqiang Yang gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb); 13644bac1f8cSYongqiang Yang gdb_bh = sbi->s_group_desc[gdb_num]; 13654bac1f8cSYongqiang Yang update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, 13664bac1f8cSYongqiang Yang gdb_bh->b_size); 13674bac1f8cSYongqiang Yang } 13684bac1f8cSYongqiang Yang } 13694bac1f8cSYongqiang Yang exit: 13704bac1f8cSYongqiang Yang return err; 13714bac1f8cSYongqiang Yang } 13724bac1f8cSYongqiang Yang 137319c5246dSYongqiang Yang static int ext4_setup_next_flex_gd(struct super_block *sb, 137419c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd, 137519c5246dSYongqiang Yang ext4_fsblk_t n_blocks_count, 137619c5246dSYongqiang Yang unsigned long flexbg_size) 137719c5246dSYongqiang Yang { 137819c5246dSYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 137919c5246dSYongqiang Yang struct ext4_new_group_data *group_data = flex_gd->groups; 138019c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 138119c5246dSYongqiang Yang ext4_group_t n_group; 138219c5246dSYongqiang Yang ext4_group_t group; 138319c5246dSYongqiang Yang ext4_group_t last_group; 138419c5246dSYongqiang Yang ext4_grpblk_t last; 138519c5246dSYongqiang Yang ext4_grpblk_t blocks_per_group; 138619c5246dSYongqiang Yang unsigned long i; 138719c5246dSYongqiang Yang 138819c5246dSYongqiang Yang blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); 138919c5246dSYongqiang Yang 139019c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 139119c5246dSYongqiang Yang 139219c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 139319c5246dSYongqiang Yang return 0; 139419c5246dSYongqiang Yang 139519c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 139619c5246dSYongqiang Yang BUG_ON(last); 139719c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); 139819c5246dSYongqiang Yang 139919c5246dSYongqiang Yang last_group = group | (flexbg_size - 1); 140019c5246dSYongqiang Yang if (last_group > n_group) 140119c5246dSYongqiang Yang last_group = n_group; 140219c5246dSYongqiang Yang 140319c5246dSYongqiang Yang flex_gd->count = last_group - group + 1; 140419c5246dSYongqiang Yang 140519c5246dSYongqiang Yang for (i = 0; i < flex_gd->count; i++) { 140619c5246dSYongqiang Yang int overhead; 140719c5246dSYongqiang Yang 140819c5246dSYongqiang Yang group_data[i].group = group + i; 140919c5246dSYongqiang Yang group_data[i].blocks_count = blocks_per_group; 141019c5246dSYongqiang Yang overhead = ext4_bg_has_super(sb, group + i) ? 141119c5246dSYongqiang Yang (1 + ext4_bg_num_gdb(sb, group + i) + 141219c5246dSYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; 141319c5246dSYongqiang Yang group_data[i].free_blocks_count = blocks_per_group - overhead; 1414feb0ab32SDarrick J. Wong if (ext4_has_group_desc_csum(sb)) 141519c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | 141619c5246dSYongqiang Yang EXT4_BG_INODE_UNINIT; 141719c5246dSYongqiang Yang else 141819c5246dSYongqiang Yang flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; 141919c5246dSYongqiang Yang } 142019c5246dSYongqiang Yang 1421feb0ab32SDarrick J. Wong if (last_group == n_group && ext4_has_group_desc_csum(sb)) 142219c5246dSYongqiang Yang /* We need to initialize block bitmap of last group. */ 142319c5246dSYongqiang Yang flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; 142419c5246dSYongqiang Yang 142519c5246dSYongqiang Yang if ((last_group == n_group) && (last != blocks_per_group - 1)) { 142619c5246dSYongqiang Yang group_data[i - 1].blocks_count = last + 1; 142719c5246dSYongqiang Yang group_data[i - 1].free_blocks_count -= blocks_per_group- 142819c5246dSYongqiang Yang last - 1; 142919c5246dSYongqiang Yang } 143019c5246dSYongqiang Yang 143119c5246dSYongqiang Yang return 1; 143219c5246dSYongqiang Yang } 143319c5246dSYongqiang Yang 1434ac27a0ecSDave Kleikamp /* Add group descriptor data to an existing or new group descriptor block. 1435ac27a0ecSDave Kleikamp * Ensure we handle all possible error conditions _before_ we start modifying 1436ac27a0ecSDave Kleikamp * the filesystem, because we cannot abort the transaction and not have it 1437ac27a0ecSDave Kleikamp * write the data to disk. 1438ac27a0ecSDave Kleikamp * 1439ac27a0ecSDave Kleikamp * If we are on a GDT block boundary, we need to get the reserved GDT block. 1440ac27a0ecSDave Kleikamp * Otherwise, we may need to add backup GDT blocks for a sparse group. 1441ac27a0ecSDave Kleikamp * 1442ac27a0ecSDave Kleikamp * We only need to hold the superblock lock while we are actually adding 1443ac27a0ecSDave Kleikamp * in the new group's counts to the superblock. Prior to that we have 1444ac27a0ecSDave Kleikamp * not really "added" the group at all. We re-check that we are still 1445ac27a0ecSDave Kleikamp * adding in the last group in case things have changed since verifying. 1446ac27a0ecSDave Kleikamp */ 1447617ba13bSMingming Cao int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 1448ac27a0ecSDave Kleikamp { 144961f296ccSYongqiang Yang struct ext4_new_flex_group_data flex_gd; 1450617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1451617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 1452617ba13bSMingming Cao int reserved_gdb = ext4_bg_has_super(sb, input->group) ? 1453ac27a0ecSDave Kleikamp le16_to_cpu(es->s_reserved_gdt_blocks) : 0; 1454ac27a0ecSDave Kleikamp struct inode *inode = NULL; 1455ac27a0ecSDave Kleikamp int gdb_off, gdb_num; 145661f296ccSYongqiang Yang int err; 145761f296ccSYongqiang Yang __u16 bg_flags = 0; 1458ac27a0ecSDave Kleikamp 1459617ba13bSMingming Cao gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); 1460617ba13bSMingming Cao gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); 1461ac27a0ecSDave Kleikamp 1462617ba13bSMingming Cao if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, 1463617ba13bSMingming Cao EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { 146412062dddSEric Sandeen ext4_warning(sb, "Can't resize non-sparse filesystem further"); 1465ac27a0ecSDave Kleikamp return -EPERM; 1466ac27a0ecSDave Kleikamp } 1467ac27a0ecSDave Kleikamp 1468bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) + input->blocks_count < 1469bd81d8eeSLaurent Vivier ext4_blocks_count(es)) { 147012062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1471ac27a0ecSDave Kleikamp return -EINVAL; 1472ac27a0ecSDave Kleikamp } 1473ac27a0ecSDave Kleikamp 1474617ba13bSMingming Cao if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < 1475ac27a0ecSDave Kleikamp le32_to_cpu(es->s_inodes_count)) { 147612062dddSEric Sandeen ext4_warning(sb, "inodes_count overflow"); 1477ac27a0ecSDave Kleikamp return -EINVAL; 1478ac27a0ecSDave Kleikamp } 1479ac27a0ecSDave Kleikamp 1480ac27a0ecSDave Kleikamp if (reserved_gdb || gdb_off == 0) { 1481617ba13bSMingming Cao if (!EXT4_HAS_COMPAT_FEATURE(sb, 148237609fd5SJosef Bacik EXT4_FEATURE_COMPAT_RESIZE_INODE) 148337609fd5SJosef Bacik || !le16_to_cpu(es->s_reserved_gdt_blocks)) { 148412062dddSEric Sandeen ext4_warning(sb, 1485ac27a0ecSDave Kleikamp "No reserved GDT blocks, can't resize"); 1486ac27a0ecSDave Kleikamp return -EPERM; 1487ac27a0ecSDave Kleikamp } 14881d1fe1eeSDavid Howells inode = ext4_iget(sb, EXT4_RESIZE_INO); 14891d1fe1eeSDavid Howells if (IS_ERR(inode)) { 149012062dddSEric Sandeen ext4_warning(sb, "Error opening resize inode"); 14911d1fe1eeSDavid Howells return PTR_ERR(inode); 1492ac27a0ecSDave Kleikamp } 1493ac27a0ecSDave Kleikamp } 1494ac27a0ecSDave Kleikamp 1495920313a7SAneesh Kumar K.V 149661f296ccSYongqiang Yang err = verify_group_input(sb, input); 1497668f4dc5SYongqiang Yang if (err) 149861f296ccSYongqiang Yang goto out; 1499ac27a0ecSDave Kleikamp 150061f296ccSYongqiang Yang flex_gd.count = 1; 150161f296ccSYongqiang Yang flex_gd.groups = input; 150261f296ccSYongqiang Yang flex_gd.bg_flags = &bg_flags; 150361f296ccSYongqiang Yang err = ext4_flex_group_add(sb, inode, &flex_gd); 150461f296ccSYongqiang Yang out: 1505ac27a0ecSDave Kleikamp iput(inode); 1506ac27a0ecSDave Kleikamp return err; 1507617ba13bSMingming Cao } /* ext4_group_add */ 1508ac27a0ecSDave Kleikamp 15092b2d6d01STheodore Ts'o /* 151018e31438SYongqiang Yang * extend a group without checking assuming that checking has been done. 151118e31438SYongqiang Yang */ 151218e31438SYongqiang Yang static int ext4_group_extend_no_check(struct super_block *sb, 151318e31438SYongqiang Yang ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) 151418e31438SYongqiang Yang { 151518e31438SYongqiang Yang struct ext4_super_block *es = EXT4_SB(sb)->s_es; 151618e31438SYongqiang Yang handle_t *handle; 151718e31438SYongqiang Yang int err = 0, err2; 151818e31438SYongqiang Yang 151918e31438SYongqiang Yang /* We will update the superblock, one block bitmap, and 152018e31438SYongqiang Yang * one group descriptor via ext4_group_add_blocks(). 152118e31438SYongqiang Yang */ 152218e31438SYongqiang Yang handle = ext4_journal_start_sb(sb, 3); 152318e31438SYongqiang Yang if (IS_ERR(handle)) { 152418e31438SYongqiang Yang err = PTR_ERR(handle); 152518e31438SYongqiang Yang ext4_warning(sb, "error %d on journal start", err); 152618e31438SYongqiang Yang return err; 152718e31438SYongqiang Yang } 152818e31438SYongqiang Yang 152918e31438SYongqiang Yang err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); 153018e31438SYongqiang Yang if (err) { 153118e31438SYongqiang Yang ext4_warning(sb, "error %d on journal write access", err); 153218e31438SYongqiang Yang goto errout; 153318e31438SYongqiang Yang } 153418e31438SYongqiang Yang 153518e31438SYongqiang Yang ext4_blocks_count_set(es, o_blocks_count + add); 1536636d7e2eSDarrick J. Wong ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); 153718e31438SYongqiang Yang ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, 153818e31438SYongqiang Yang o_blocks_count + add); 153918e31438SYongqiang Yang /* We add the blocks to the bitmap and set the group need init bit */ 154018e31438SYongqiang Yang err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); 154118e31438SYongqiang Yang if (err) 154218e31438SYongqiang Yang goto errout; 154318e31438SYongqiang Yang ext4_handle_dirty_super(handle, sb); 154418e31438SYongqiang Yang ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, 154518e31438SYongqiang Yang o_blocks_count + add); 154618e31438SYongqiang Yang errout: 154718e31438SYongqiang Yang err2 = ext4_journal_stop(handle); 154818e31438SYongqiang Yang if (err2 && !err) 154918e31438SYongqiang Yang err = err2; 155018e31438SYongqiang Yang 155118e31438SYongqiang Yang if (!err) { 155218e31438SYongqiang Yang if (test_opt(sb, DEBUG)) 155318e31438SYongqiang Yang printk(KERN_DEBUG "EXT4-fs: extended group to %llu " 155418e31438SYongqiang Yang "blocks\n", ext4_blocks_count(es)); 155518e31438SYongqiang Yang update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, 155618e31438SYongqiang Yang sizeof(struct ext4_super_block)); 155718e31438SYongqiang Yang } 155818e31438SYongqiang Yang return err; 155918e31438SYongqiang Yang } 156018e31438SYongqiang Yang 156118e31438SYongqiang Yang /* 15622b2d6d01STheodore Ts'o * Extend the filesystem to the new number of blocks specified. This entry 1563ac27a0ecSDave Kleikamp * point is only used to extend the current filesystem to the end of the last 1564ac27a0ecSDave Kleikamp * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" 1565ac27a0ecSDave Kleikamp * for emergencies (because it has no dependencies on reserved blocks). 1566ac27a0ecSDave Kleikamp * 1567617ba13bSMingming Cao * If we _really_ wanted, we could use default values to call ext4_group_add() 1568ac27a0ecSDave Kleikamp * allow the "remount" trick to work for arbitrary resizing, assuming enough 1569ac27a0ecSDave Kleikamp * GDT blocks are reserved to grow to the desired size. 1570ac27a0ecSDave Kleikamp */ 1571617ba13bSMingming Cao int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, 1572617ba13bSMingming Cao ext4_fsblk_t n_blocks_count) 1573ac27a0ecSDave Kleikamp { 1574617ba13bSMingming Cao ext4_fsblk_t o_blocks_count; 1575617ba13bSMingming Cao ext4_grpblk_t last; 1576617ba13bSMingming Cao ext4_grpblk_t add; 1577ac27a0ecSDave Kleikamp struct buffer_head *bh; 1578d89651c8SYongqiang Yang int err; 15795f21b0e6SFrederic Bohe ext4_group_t group; 1580ac27a0ecSDave Kleikamp 1581bd81d8eeSLaurent Vivier o_blocks_count = ext4_blocks_count(es); 1582ac27a0ecSDave Kleikamp 1583ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 158492b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, 158592b97816STheodore Ts'o "extending last group from %llu to %llu blocks", 1586ac27a0ecSDave Kleikamp o_blocks_count, n_blocks_count); 1587ac27a0ecSDave Kleikamp 1588ac27a0ecSDave Kleikamp if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) 1589ac27a0ecSDave Kleikamp return 0; 1590ac27a0ecSDave Kleikamp 1591ac27a0ecSDave Kleikamp if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 159292b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, 159392b97816STheodore Ts'o "filesystem too large to resize to %llu blocks safely", 159492b97816STheodore Ts'o n_blocks_count); 1595ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 159612062dddSEric Sandeen ext4_warning(sb, "CONFIG_LBDAF not enabled"); 1597ac27a0ecSDave Kleikamp return -EINVAL; 1598ac27a0ecSDave Kleikamp } 1599ac27a0ecSDave Kleikamp 1600ac27a0ecSDave Kleikamp if (n_blocks_count < o_blocks_count) { 160112062dddSEric Sandeen ext4_warning(sb, "can't shrink FS - resize aborted"); 16028f82f840SYongqiang Yang return -EINVAL; 1603ac27a0ecSDave Kleikamp } 1604ac27a0ecSDave Kleikamp 1605ac27a0ecSDave Kleikamp /* Handle the remaining blocks in the last group only. */ 16065f21b0e6SFrederic Bohe ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); 1607ac27a0ecSDave Kleikamp 1608ac27a0ecSDave Kleikamp if (last == 0) { 160912062dddSEric Sandeen ext4_warning(sb, "need to use ext2online to resize further"); 1610ac27a0ecSDave Kleikamp return -EPERM; 1611ac27a0ecSDave Kleikamp } 1612ac27a0ecSDave Kleikamp 1613617ba13bSMingming Cao add = EXT4_BLOCKS_PER_GROUP(sb) - last; 1614ac27a0ecSDave Kleikamp 1615ac27a0ecSDave Kleikamp if (o_blocks_count + add < o_blocks_count) { 161612062dddSEric Sandeen ext4_warning(sb, "blocks_count overflow"); 1617ac27a0ecSDave Kleikamp return -EINVAL; 1618ac27a0ecSDave Kleikamp } 1619ac27a0ecSDave Kleikamp 1620ac27a0ecSDave Kleikamp if (o_blocks_count + add > n_blocks_count) 1621ac27a0ecSDave Kleikamp add = n_blocks_count - o_blocks_count; 1622ac27a0ecSDave Kleikamp 1623ac27a0ecSDave Kleikamp if (o_blocks_count + add < n_blocks_count) 162412062dddSEric Sandeen ext4_warning(sb, "will only finish group (%llu blocks, %u new)", 1625ac27a0ecSDave Kleikamp o_blocks_count + add, add); 1626ac27a0ecSDave Kleikamp 1627ac27a0ecSDave Kleikamp /* See if the device is actually as big as what was requested */ 1628ac27a0ecSDave Kleikamp bh = sb_bread(sb, o_blocks_count + add - 1); 1629ac27a0ecSDave Kleikamp if (!bh) { 163012062dddSEric Sandeen ext4_warning(sb, "can't read last block, resize aborted"); 1631ac27a0ecSDave Kleikamp return -ENOSPC; 1632ac27a0ecSDave Kleikamp } 1633ac27a0ecSDave Kleikamp brelse(bh); 1634ac27a0ecSDave Kleikamp 1635d89651c8SYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 1636ac27a0ecSDave Kleikamp return err; 1637617ba13bSMingming Cao } /* ext4_group_extend */ 163819c5246dSYongqiang Yang 163919c5246dSYongqiang Yang /* 164019c5246dSYongqiang Yang * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count 164119c5246dSYongqiang Yang * 164219c5246dSYongqiang Yang * @sb: super block of the fs to be resized 164319c5246dSYongqiang Yang * @n_blocks_count: the number of blocks resides in the resized fs 164419c5246dSYongqiang Yang */ 164519c5246dSYongqiang Yang int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 164619c5246dSYongqiang Yang { 164719c5246dSYongqiang Yang struct ext4_new_flex_group_data *flex_gd = NULL; 164819c5246dSYongqiang Yang struct ext4_sb_info *sbi = EXT4_SB(sb); 164919c5246dSYongqiang Yang struct ext4_super_block *es = sbi->s_es; 165019c5246dSYongqiang Yang struct buffer_head *bh; 165119c5246dSYongqiang Yang struct inode *resize_inode; 165219c5246dSYongqiang Yang ext4_fsblk_t o_blocks_count; 165319c5246dSYongqiang Yang ext4_group_t o_group; 165419c5246dSYongqiang Yang ext4_group_t n_group; 1655a0ade1deSLukas Czerner ext4_grpblk_t offset, add; 165619c5246dSYongqiang Yang unsigned long n_desc_blocks; 165719c5246dSYongqiang Yang unsigned long o_desc_blocks; 165819c5246dSYongqiang Yang unsigned long desc_blocks; 165919c5246dSYongqiang Yang int err = 0, flexbg_size = 1; 166019c5246dSYongqiang Yang 166119c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 166219c5246dSYongqiang Yang 166319c5246dSYongqiang Yang if (test_opt(sb, DEBUG)) 166492b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, "resizing filesystem from %llu " 166592b97816STheodore Ts'o "to %llu blocks", o_blocks_count, n_blocks_count); 166619c5246dSYongqiang Yang 166719c5246dSYongqiang Yang if (n_blocks_count < o_blocks_count) { 166819c5246dSYongqiang Yang /* On-line shrinking not supported */ 166919c5246dSYongqiang Yang ext4_warning(sb, "can't shrink FS - resize aborted"); 167019c5246dSYongqiang Yang return -EINVAL; 167119c5246dSYongqiang Yang } 167219c5246dSYongqiang Yang 167319c5246dSYongqiang Yang if (n_blocks_count == o_blocks_count) 167419c5246dSYongqiang Yang /* Nothing need to do */ 167519c5246dSYongqiang Yang return 0; 167619c5246dSYongqiang Yang 167719c5246dSYongqiang Yang ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); 1678a0ade1deSLukas Czerner ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); 167919c5246dSYongqiang Yang 168019c5246dSYongqiang Yang n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) / 168119c5246dSYongqiang Yang EXT4_DESC_PER_BLOCK(sb); 168219c5246dSYongqiang Yang o_desc_blocks = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 168319c5246dSYongqiang Yang EXT4_DESC_PER_BLOCK(sb); 168419c5246dSYongqiang Yang desc_blocks = n_desc_blocks - o_desc_blocks; 168519c5246dSYongqiang Yang 168619c5246dSYongqiang Yang if (desc_blocks && 168719c5246dSYongqiang Yang (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE) || 168819c5246dSYongqiang Yang le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks)) { 168919c5246dSYongqiang Yang ext4_warning(sb, "No reserved GDT blocks, can't resize"); 169019c5246dSYongqiang Yang return -EPERM; 169119c5246dSYongqiang Yang } 169219c5246dSYongqiang Yang 169319c5246dSYongqiang Yang resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); 169419c5246dSYongqiang Yang if (IS_ERR(resize_inode)) { 169519c5246dSYongqiang Yang ext4_warning(sb, "Error opening resize inode"); 169619c5246dSYongqiang Yang return PTR_ERR(resize_inode); 169719c5246dSYongqiang Yang } 169819c5246dSYongqiang Yang 169919c5246dSYongqiang Yang /* See if the device is actually as big as what was requested */ 170019c5246dSYongqiang Yang bh = sb_bread(sb, n_blocks_count - 1); 170119c5246dSYongqiang Yang if (!bh) { 170219c5246dSYongqiang Yang ext4_warning(sb, "can't read last block, resize aborted"); 170319c5246dSYongqiang Yang return -ENOSPC; 170419c5246dSYongqiang Yang } 170519c5246dSYongqiang Yang brelse(bh); 170619c5246dSYongqiang Yang 170719c5246dSYongqiang Yang /* extend the last group */ 1708a0ade1deSLukas Czerner if (n_group == o_group) 1709a0ade1deSLukas Czerner add = n_blocks_count - o_blocks_count; 1710a0ade1deSLukas Czerner else 1711a0ade1deSLukas Czerner add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); 1712a0ade1deSLukas Czerner if (add > 0) { 171319c5246dSYongqiang Yang err = ext4_group_extend_no_check(sb, o_blocks_count, add); 171419c5246dSYongqiang Yang if (err) 171519c5246dSYongqiang Yang goto out; 171619c5246dSYongqiang Yang } 171719c5246dSYongqiang Yang 171819c5246dSYongqiang Yang if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && 171919c5246dSYongqiang Yang es->s_log_groups_per_flex) 172019c5246dSYongqiang Yang flexbg_size = 1 << es->s_log_groups_per_flex; 172119c5246dSYongqiang Yang 172219c5246dSYongqiang Yang o_blocks_count = ext4_blocks_count(es); 172319c5246dSYongqiang Yang if (o_blocks_count == n_blocks_count) 172419c5246dSYongqiang Yang goto out; 172519c5246dSYongqiang Yang 172619c5246dSYongqiang Yang flex_gd = alloc_flex_gd(flexbg_size); 172719c5246dSYongqiang Yang if (flex_gd == NULL) { 172819c5246dSYongqiang Yang err = -ENOMEM; 172919c5246dSYongqiang Yang goto out; 173019c5246dSYongqiang Yang } 173119c5246dSYongqiang Yang 173219c5246dSYongqiang Yang /* Add flex groups. Note that a regular group is a 173319c5246dSYongqiang Yang * flex group with 1 group. 173419c5246dSYongqiang Yang */ 173519c5246dSYongqiang Yang while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, 173619c5246dSYongqiang Yang flexbg_size)) { 173703c1c290SYongqiang Yang if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) 173803c1c290SYongqiang Yang break; 173919c5246dSYongqiang Yang err = ext4_flex_group_add(sb, resize_inode, flex_gd); 174019c5246dSYongqiang Yang if (unlikely(err)) 174119c5246dSYongqiang Yang break; 174219c5246dSYongqiang Yang } 174319c5246dSYongqiang Yang 174419c5246dSYongqiang Yang out: 174519c5246dSYongqiang Yang if (flex_gd) 174619c5246dSYongqiang Yang free_flex_gd(flex_gd); 174719c5246dSYongqiang Yang 174819c5246dSYongqiang Yang iput(resize_inode); 174919c5246dSYongqiang Yang if (test_opt(sb, DEBUG)) 175092b97816STheodore Ts'o ext4_msg(sb, KERN_DEBUG, "resized filesystem from %llu " 175192b97816STheodore Ts'o "upto %llu blocks", o_blocks_count, n_blocks_count); 175219c5246dSYongqiang Yang return err; 175319c5246dSYongqiang Yang } 1754