| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * linux/fs/ext4/resize.c |
| * |
| * Support for resizing an ext4 filesystem while it is mounted. |
| * |
| * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> |
| * |
| * This could probably be made into a module, because it is not often in use. |
| */ |
| |
| |
| #define EXT4FS_DEBUG |
| |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| |
| #include "ext4_jbd2.h" |
| |
| struct ext4_rcu_ptr { |
| struct rcu_head rcu; |
| void *ptr; |
| }; |
| |
| static void ext4_rcu_ptr_callback(struct rcu_head *head) |
| { |
| struct ext4_rcu_ptr *ptr; |
| |
| ptr = container_of(head, struct ext4_rcu_ptr, rcu); |
| kvfree(ptr->ptr); |
| kfree(ptr); |
| } |
| |
| void ext4_kvfree_array_rcu(void *to_free) |
| { |
| struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); |
| |
| if (ptr) { |
| ptr->ptr = to_free; |
| call_rcu(&ptr->rcu, ext4_rcu_ptr_callback); |
| return; |
| } |
| synchronize_rcu(); |
| kvfree(to_free); |
| } |
| |
| int ext4_resize_begin(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int ret = 0; |
| |
| if (!capable(CAP_SYS_RESOURCE)) |
| return -EPERM; |
| |
| /* |
| * If we are not using the primary superblock/GDT copy don't resize, |
| * because the user tools have no way of handling this. Probably a |
| * bad time to do it anyways. |
| */ |
| if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { |
| ext4_warning(sb, "won't resize using backup superblock at %llu", |
| (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
| return -EPERM; |
| } |
| |
| /* |
| * We are not allowed to do online-resizing on a filesystem mounted |
| * with error, because it can destroy the filesystem easily. |
| */ |
| if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
| ext4_warning(sb, "There are errors in the filesystem, " |
| "so online resizing is not allowed"); |
| return -EPERM; |
| } |
| |
| if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, |
| &EXT4_SB(sb)->s_ext4_flags)) |
| ret = -EBUSY; |
| |
| return ret; |
| } |
| |
| void ext4_resize_end(struct super_block *sb) |
| { |
| clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); |
| smp_mb__after_atomic(); |
| } |
| |
| static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
| ext4_group_t group) { |
| return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << |
| EXT4_DESC_PER_BLOCK_BITS(sb); |
| } |
| |
| static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, |
| ext4_group_t group) { |
| group = ext4_meta_bg_first_group(sb, group); |
| return ext4_group_first_block_no(sb, group); |
| } |
| |
| static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, |
| ext4_group_t group) { |
| ext4_grpblk_t overhead; |
| overhead = ext4_bg_num_gdb(sb, group); |
| if (ext4_bg_has_super(sb, group)) |
| overhead += 1 + |
| le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
| return overhead; |
| } |
| |
| #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
| #define inside(b, first, last) ((b) >= (first) && (b) < (last)) |
| |
| static int verify_group_input(struct super_block *sb, |
| struct ext4_new_group_data *input) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| ext4_fsblk_t start = ext4_blocks_count(es); |
| ext4_fsblk_t end = start + input->blocks_count; |
| ext4_group_t group = input->group; |
| ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
| unsigned overhead; |
| ext4_fsblk_t metaend; |
| struct buffer_head *bh = NULL; |
| ext4_grpblk_t free_blocks_count, offset; |
| int err = -EINVAL; |
| |
| if (group != sbi->s_groups_count) { |
| ext4_warning(sb, "Cannot add at group %u (only %u groups)", |
| input->group, sbi->s_groups_count); |
| return -EINVAL; |
| } |
| |
| overhead = ext4_group_overhead_blocks(sb, group); |
| metaend = start + overhead; |
| input->free_clusters_count = free_blocks_count = |
| input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
| |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
| "(%d free, %u reserved)\n", |
| ext4_bg_has_super(sb, input->group) ? "normal" : |
| "no-super", input->group, input->blocks_count, |
| free_blocks_count, input->reserved_blocks); |
| |
| ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
| if (offset != 0) |
| ext4_warning(sb, "Last group not full"); |
| else if (input->reserved_blocks > input->blocks_count / 5) |
| ext4_warning(sb, "Reserved blocks too high (%u)", |
| input->reserved_blocks); |
| else if (free_blocks_count < 0) |
| ext4_warning(sb, "Bad blocks count %u", |
| input->blocks_count); |
| else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { |
| err = PTR_ERR(bh); |
| bh = NULL; |
| ext4_warning(sb, "Cannot read last block (%llu)", |
| end - 1); |
| } else if (outside(input->block_bitmap, start, end)) |
| ext4_warning(sb, "Block bitmap not in group (block %llu)", |
| (unsigned long long)input->block_bitmap); |
| else if (outside(input->inode_bitmap, start, end)) |
| ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
| (unsigned long long)input->inode_bitmap); |
| else if (outside(input->inode_table, start, end) || |
| outside(itend - 1, start, end)) |
| ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
| (unsigned long long)input->inode_table, itend - 1); |
| else if (input->inode_bitmap == input->block_bitmap) |
| ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
| (unsigned long long)input->block_bitmap); |
| else if (inside(input->block_bitmap, input->inode_table, itend)) |
| ext4_warning(sb, "Block bitmap (%llu) in inode table " |
| "(%llu-%llu)", |
| (unsigned long long)input->block_bitmap, |
| (unsigned long long)input->inode_table, itend - 1); |
| else if (inside(input->inode_bitmap, input->inode_table, itend)) |
| ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
| "(%llu-%llu)", |
| (unsigned long long)input->inode_bitmap, |
| (unsigned long long)input->inode_table, itend - 1); |
| else if (inside(input->block_bitmap, start, metaend)) |
| ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
| (unsigned long long)input->block_bitmap, |
| start, metaend - 1); |
| else if (inside(input->inode_bitmap, start, metaend)) |
| ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
| (unsigned long long)input->inode_bitmap, |
| start, metaend - 1); |
| else if (inside(input->inode_table, start, metaend) || |
| inside(itend - 1, start, metaend)) |
| ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
| "(%llu-%llu)", |
| (unsigned long long)input->inode_table, |
| itend - 1, start, metaend - 1); |
| else |
| err = 0; |
| brelse(bh); |
| |
| return err; |
| } |
| |
| /* |
| * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex |
| * group each time. |
| */ |
| struct ext4_new_flex_group_data { |
| struct ext4_new_group_data *groups; /* new_group_data for groups |
| in the flex group */ |
| __u16 *bg_flags; /* block group flags of groups |
| in @groups */ |
| ext4_group_t count; /* number of groups in @groups |
| */ |
| }; |
| |
| /* |
| * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of |
| * @flexbg_size. |
| * |
| * Returns NULL on failure otherwise address of the allocated structure. |
| */ |
| static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) |
| { |
| struct ext4_new_flex_group_data *flex_gd; |
| |
| flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); |
| if (flex_gd == NULL) |
| goto out3; |
| |
| if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) |
| goto out2; |
| flex_gd->count = flexbg_size; |
| |
| flex_gd->groups = kmalloc_array(flexbg_size, |
| sizeof(struct ext4_new_group_data), |
| GFP_NOFS); |
| if (flex_gd->groups == NULL) |
| goto out2; |
| |
| flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), |
| GFP_NOFS); |
| if (flex_gd->bg_flags == NULL) |
| goto out1; |
| |
| return flex_gd; |
| |
| out1: |
| kfree(flex_gd->groups); |
| out2: |
| kfree(flex_gd); |
| out3: |
| return NULL; |
| } |
| |
| static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) |
| { |
| kfree(flex_gd->bg_flags); |
| kfree(flex_gd->groups); |
| kfree(flex_gd); |
| } |
| |
| /* |
| * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps |
| * and inode tables for a flex group. |
| * |
| * This function is used by 64bit-resize. Note that this function allocates |
| * group tables from the 1st group of groups contained by @flexgd, which may |
| * be a partial of a flex group. |
| * |
| * @sb: super block of fs to which the groups belongs |
| * |
| * Returns 0 on a successful allocation of the metadata blocks in the |
| * block group. |
| */ |
| static int ext4_alloc_group_tables(struct super_block *sb, |
| struct ext4_new_flex_group_data *flex_gd, |
| int flexbg_size) |
| { |
| struct ext4_new_group_data *group_data = flex_gd->groups; |
| ext4_fsblk_t start_blk; |
| ext4_fsblk_t last_blk; |
| ext4_group_t src_group; |
| ext4_group_t bb_index = 0; |
| ext4_group_t ib_index = 0; |
| ext4_group_t it_index = 0; |
| ext4_group_t group; |
| ext4_group_t last_group; |
| unsigned overhead; |
| __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; |
| int i; |
| |
| BUG_ON(flex_gd->count == 0 || group_data == NULL); |
| |
| src_group = group_data[0].group; |
| last_group = src_group + flex_gd->count - 1; |
| |
| BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != |
| (last_group & ~(flexbg_size - 1)))); |
| next_group: |
| group = group_data[0].group; |
| if (src_group >= group_data[0].group + flex_gd->count) |
| return -ENOSPC; |
| start_blk = ext4_group_first_block_no(sb, src_group); |
| last_blk = start_blk + group_data[src_group - group].blocks_count; |
| |
| overhead = ext4_group_overhead_blocks(sb, src_group); |
| |
| start_blk += overhead; |
| |
| /* We collect contiguous blocks as much as possible. */ |
| src_group++; |
| for (; src_group <= last_group; src_group++) { |
| overhead = ext4_group_overhead_blocks(sb, src_group); |
| if (overhead == 0) |
| last_blk += group_data[src_group - group].blocks_count; |
| else |
| break; |
| } |
| |
| /* Allocate block bitmaps */ |
| for (; bb_index < flex_gd->count; bb_index++) { |
| if (start_blk >= last_blk) |
| goto next_group; |
| group_data[bb_index].block_bitmap = start_blk++; |
| group = ext4_get_group_number(sb, start_blk - 1); |
| group -= group_data[0].group; |
| group_data[group].mdata_blocks++; |
| flex_gd->bg_flags[group] &= uninit_mask; |
| } |
| |
| /* Allocate inode bitmaps */ |
| for (; ib_index < flex_gd->count; ib_index++) { |
| if (start_blk >= last_blk) |
| goto next_group; |
| group_data[ib_index].inode_bitmap = start_blk++; |
| group = ext4_get_group_number(sb, start_blk - 1); |
| group -= group_data[0].group; |
| group_data[group].mdata_blocks++; |
| flex_gd->bg_flags[group] &= uninit_mask; |
| } |
| |
| /* Allocate inode tables */ |
| for (; it_index < flex_gd->count; it_index++) { |
| unsigned int itb = EXT4_SB(sb)->s_itb_per_group; |
| ext4_fsblk_t next_group_start; |
| |
| if (start_blk + itb > last_blk) |
| goto next_group; |
| group_data[it_index].inode_table = start_blk; |
| group = ext4_get_group_number(sb, start_blk); |
| next_group_start = ext4_group_first_block_no(sb, group + 1); |
| group -= group_data[0].group; |
| |
| if (start_blk + itb > next_group_start) { |
| flex_gd->bg_flags[group + 1] &= uninit_mask; |
| overhead = start_blk + itb - next_group_start; |
| group_data[group + 1].mdata_blocks += overhead; |
| itb -= overhead; |
| } |
| |
| group_data[group].mdata_blocks += itb; |
| flex_gd->bg_flags[group] &= uninit_mask; |
| start_blk += EXT4_SB(sb)->s_itb_per_group; |
| } |
| |
| /* Update free clusters count to exclude metadata blocks */ |
| for (i = 0; i < flex_gd->count; i++) { |
| group_data[i].free_clusters_count -= |
| EXT4_NUM_B2C(EXT4_SB(sb), |
| group_data[i].mdata_blocks); |
| } |
| |
| if (test_opt(sb, DEBUG)) { |
| int i; |
| group = group_data[0].group; |
| |
| printk(KERN_DEBUG "EXT4-fs: adding a flex group with " |
| "%d groups, flexbg size is %d:\n", flex_gd->count, |
| flexbg_size); |
| |
| for (i = 0; i < flex_gd->count; i++) { |
| ext4_debug( |
| "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", |
| ext4_bg_has_super(sb, group + i) ? "normal" : |
| "no-super", group + i, |
| group_data[i].blocks_count, |
| group_data[i].free_clusters_count, |
| group_data[i].mdata_blocks); |
| } |
| } |
| return 0; |
| } |
| |
| static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
| ext4_fsblk_t blk) |
| { |
| struct buffer_head *bh; |
| int err; |
| |
| bh = sb_getblk(sb, blk); |
| if (unlikely(!bh)) |
| return ERR_PTR(-ENOMEM); |
| BUFFER_TRACE(bh, "get_write_access"); |
| if ((err = ext4_journal_get_write_access(handle, bh))) { |
| brelse(bh); |
| bh = ERR_PTR(err); |
| } else { |
| memset(bh->b_data, 0, sb->s_blocksize); |
| set_buffer_uptodate(bh); |
| } |
| |
| return bh; |
| } |
| |
| /* |
| * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. |
| * If that fails, restart the transaction & regain write access for the |
| * buffer head which is used for block_bitmap modifications. |
| */ |
| static int extend_or_restart_transaction(handle_t *handle, int thresh) |
| { |
| int err; |
| |
| if (ext4_handle_has_enough_credits(handle, thresh)) |
| return 0; |
| |
| err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); |
| if (err < 0) |
| return err; |
| if (err) { |
| err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. |
| * |
| * Helper function for ext4_setup_new_group_blocks() which set . |
| * |
| * @sb: super block |
| * @handle: journal handle |
| * @flex_gd: flex group data |
| */ |
| static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, |
| struct ext4_new_flex_group_data *flex_gd, |
| ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_group_t count = last_cluster - first_cluster + 1; |
| ext4_group_t count2; |
| |
| ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, |
| last_cluster); |
| for (count2 = count; count > 0; |
| count -= count2, first_cluster += count2) { |
| ext4_fsblk_t start; |
| struct buffer_head *bh; |
| ext4_group_t group; |
| int err; |
| |
| group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); |
| start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); |
| group -= flex_gd->groups[0].group; |
| |
| count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); |
| if (count2 > count) |
| count2 = count; |
| |
| if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { |
| BUG_ON(flex_gd->count > 1); |
| continue; |
| } |
| |
| err = extend_or_restart_transaction(handle, 1); |
| if (err) |
| return err; |
| |
| bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); |
| if (unlikely(!bh)) |
| return -ENOMEM; |
| |
| BUFFER_TRACE(bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, bh); |
| if (err) { |
| brelse(bh); |
| return err; |
| } |
| ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", |
| first_cluster, first_cluster - start, count2); |
| ext4_set_bits(bh->b_data, first_cluster - start, count2); |
| |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| brelse(bh); |
| if (unlikely(err)) |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Set up the block and inode bitmaps, and the inode table for the new groups. |
| * This doesn't need to be part of the main transaction, since we are only |
| * changing blocks outside the actual filesystem. We still do journaling to |
| * ensure the recovery is correct in case of a failure just after resize. |
| * If any part of this fails, we simply abort the resize. |
| * |
| * setup_new_flex_group_blocks handles a flex group as follow: |
| * 1. copy super block and GDT, and initialize group tables if necessary. |
| * In this step, we only set bits in blocks bitmaps for blocks taken by |
| * super block and GDT. |
| * 2. allocate group tables in block bitmaps, that is, set bits in block |
| * bitmap for blocks taken by group tables. |
| */ |
| static int setup_new_flex_group_blocks(struct super_block *sb, |
| struct ext4_new_flex_group_data *flex_gd) |
| { |
| int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; |
| ext4_fsblk_t start; |
| ext4_fsblk_t block; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| struct ext4_new_group_data *group_data = flex_gd->groups; |
| __u16 *bg_flags = flex_gd->bg_flags; |
| handle_t *handle; |
| ext4_group_t group, count; |
| struct buffer_head *bh = NULL; |
| int reserved_gdb, i, j, err = 0, err2; |
| int meta_bg; |
| |
| BUG_ON(!flex_gd->count || !group_data || |
| group_data[0].group != sbi->s_groups_count); |
| |
| reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); |
| meta_bg = ext4_has_feature_meta_bg(sb); |
| |
| /* This transaction may be extended/restarted along the way */ |
| handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| |
| group = group_data[0].group; |
| for (i = 0; i < flex_gd->count; i++, group++) { |
| unsigned long gdblocks; |
| ext4_grpblk_t overhead; |
| |
| gdblocks = ext4_bg_num_gdb(sb, group); |
| start = ext4_group_first_block_no(sb, group); |
| |
| if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
| goto handle_itb; |
| |
| if (meta_bg == 1) { |
| ext4_group_t first_group; |
| first_group = ext4_meta_bg_first_group(sb, group); |
| if (first_group != group + 1 && |
| first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) |
| goto handle_itb; |
| } |
| |
| block = start + ext4_bg_has_super(sb, group); |
| /* Copy all of the GDT blocks into the backup in this group */ |
| for (j = 0; j < gdblocks; j++, block++) { |
| struct buffer_head *gdb; |
| |
| ext4_debug("update backup group %#04llx\n", block); |
| err = extend_or_restart_transaction(handle, 1); |
| if (err) |
| goto out; |
| |
| gdb = sb_getblk(sb, block); |
| if (unlikely(!gdb)) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| BUFFER_TRACE(gdb, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, gdb); |
| if (err) { |
| brelse(gdb); |
| goto out; |
| } |
| memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, |
| s_group_desc, j)->b_data, gdb->b_size); |
| set_buffer_uptodate(gdb); |
| |
| err = ext4_handle_dirty_metadata(handle, NULL, gdb); |
| if (unlikely(err)) { |
| brelse(gdb); |
| goto out; |
| } |
| brelse(gdb); |
| } |
| |
| /* Zero out all of the reserved backup group descriptor |
| * table blocks |
| */ |
| if (ext4_bg_has_super(sb, group)) { |
| err = sb_issue_zeroout(sb, gdblocks + start + 1, |
| reserved_gdb, GFP_NOFS); |
| if (err) |
| goto out; |
| } |
| |
| handle_itb: |
| /* Initialize group tables of the grop @group */ |
| if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) |
| goto handle_bb; |
| |
| /* Zero out all of the inode table blocks */ |
| block = group_data[i].inode_table; |
| ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
| block, sbi->s_itb_per_group); |
| err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, |
| GFP_NOFS); |
| if (err) |
| goto out; |
| |
| handle_bb: |
| if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) |
| goto handle_ib; |
| |
| /* Initialize block bitmap of the @group */ |
| block = group_data[i].block_bitmap; |
| err = extend_or_restart_transaction(handle, 1); |
| if (err) |
| goto out; |
| |
| bh = bclean(handle, sb, block); |
| if (IS_ERR(bh)) { |
| err = PTR_ERR(bh); |
| goto out; |
| } |
| overhead = ext4_group_overhead_blocks(sb, group); |
| if (overhead != 0) { |
| ext4_debug("mark backup superblock %#04llx (+0)\n", |
| start); |
| ext4_set_bits(bh->b_data, 0, |
| EXT4_NUM_B2C(sbi, overhead)); |
| } |
| ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), |
| sb->s_blocksize * 8, bh->b_data); |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| brelse(bh); |
| if (err) |
| goto out; |
| |
| handle_ib: |
| if (bg_flags[i] & EXT4_BG_INODE_UNINIT) |
| continue; |
| |
| /* Initialize inode bitmap of the @group */ |
| block = group_data[i].inode_bitmap; |
| err = extend_or_restart_transaction(handle, 1); |
| if (err) |
| goto out; |
| /* Mark unused entries in inode bitmap used */ |
| bh = bclean(handle, sb, block); |
| if (IS_ERR(bh)) { |
| err = PTR_ERR(bh); |
| goto out; |
| } |
| |
| ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), |
| sb->s_blocksize * 8, bh->b_data); |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| brelse(bh); |
| if (err) |
| goto out; |
| } |
| |
| /* Mark group tables in block bitmap */ |
| for (j = 0; j < GROUP_TABLE_COUNT; j++) { |
| count = group_table_count[j]; |
| start = (&group_data[0].block_bitmap)[j]; |
| block = start; |
| for (i = 1; i < flex_gd->count; i++) { |
| block += group_table_count[j]; |
| if (block == (&group_data[i].block_bitmap)[j]) { |
| count += group_table_count[j]; |
| continue; |
| } |
| err = set_flexbg_block_bitmap(sb, handle, |
| flex_gd, |
| EXT4_B2C(sbi, start), |
| EXT4_B2C(sbi, |
| start + count |
| - 1)); |
| if (err) |
| goto out; |
| count = group_table_count[j]; |
| start = (&group_data[i].block_bitmap)[j]; |
| block = start; |
| } |
| |
| if (count) { |
| err = set_flexbg_block_bitmap(sb, handle, |
| flex_gd, |
| EXT4_B2C(sbi, start), |
| EXT4_B2C(sbi, |
| start + count |
| - 1)); |
| if (err) |
| goto out; |
| } |
| } |
| |
| out: |
| err2 = ext4_journal_stop(handle); |
| if (err2 && !err) |
| err = err2; |
| |
| return err; |
| } |
| |
| /* |
| * Iterate through the groups which hold BACKUP superblock/GDT copies in an |
| * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
| * calling this for the first time. In a sparse filesystem it will be the |
| * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... |
| * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... |
| */ |
| static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
| unsigned *five, unsigned *seven) |
| { |
| unsigned *min = three; |
| int mult = 3; |
| unsigned ret; |
| |
| if (!ext4_has_feature_sparse_super(sb)) { |
| ret = *min; |
| *min += 1; |
| return ret; |
| } |
| |
| if (*five < *min) { |
| min = five; |
| mult = 5; |
| } |
| if (*seven < *min) { |
| min = seven; |
| mult = 7; |
| } |
| |
| ret = *min; |
| *min *= mult; |
| |
| return ret; |
| } |
| |
| /* |
| * Check that all of the backup GDT blocks are held in the primary GDT block. |
| * It is assumed that they are stored in group order. Returns the number of |
| * groups in current filesystem that have BACKUPS, or -ve error code. |
| */ |
| static int verify_reserved_gdb(struct super_block *sb, |
| ext4_group_t end, |
| struct buffer_head *primary) |
| { |
| const ext4_fsblk_t blk = primary->b_blocknr; |
| unsigned three = 1; |
| unsigned five = 5; |
| unsigned seven = 7; |
| unsigned grp; |
| __le32 *p = (__le32 *)primary->b_data; |
| int gdbackups = 0; |
| |
| while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
| if (le32_to_cpu(*p++) != |
| grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ |
| ext4_warning(sb, "reserved GDT %llu" |
| " missing grp %d (%llu)", |
| blk, grp, |
| grp * |
| (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
| blk); |
| return -EINVAL; |
| } |
| if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
| return -EFBIG; |
| } |
| |
| return gdbackups; |
| } |
| |
| /* |
| * Called when we need to bring a reserved group descriptor table block into |
| * use from the resize inode. The primary copy of the new GDT block currently |
| * is an indirect block (under the double indirect block in the resize inode). |
| * The new backup GDT blocks will be stored as leaf blocks in this indirect |
| * block, in group order. Even though we know all the block numbers we need, |
| * we check to ensure that the resize inode has actually reserved these blocks. |
| * |
| * Don't need to update the block bitmaps because the blocks are still in use. |
| * |
| * We get all of the error cases out of the way, so that we are sure to not |
| * fail once we start modifying the data on disk, because JBD has no rollback. |
| */ |
| static int add_new_gdb(handle_t *handle, struct inode *inode, |
| ext4_group_t group) |
| { |
| struct super_block *sb = inode->i_sb; |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
| struct buffer_head **o_group_desc, **n_group_desc = NULL; |
| struct buffer_head *dind = NULL; |
| struct buffer_head *gdb_bh = NULL; |
| int gdbackups; |
| struct ext4_iloc iloc = { .bh = NULL }; |
| __le32 *data; |
| int err; |
| |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_DEBUG |
| "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
| gdb_num); |
| |
| gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
| if (IS_ERR(gdb_bh)) |
| return PTR_ERR(gdb_bh); |
| |
| gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
| if (gdbackups < 0) { |
| err = gdbackups; |
| goto errout; |
| } |
| |
| data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
| dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
| if (IS_ERR(dind)) { |
| err = PTR_ERR(dind); |
| dind = NULL; |
| goto errout; |
| } |
| |
| data = (__le32 *)dind->b_data; |
| if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
| ext4_warning(sb, "new group %u GDT block %llu not reserved", |
| group, gdblock); |
| err = -EINVAL; |
| goto errout; |
| } |
| |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
| if (unlikely(err)) |
| goto errout; |
| |
| BUFFER_TRACE(gdb_bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, gdb_bh); |
| if (unlikely(err)) |
| goto errout; |
| |
| BUFFER_TRACE(dind, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, dind); |
| if (unlikely(err)) { |
| ext4_std_error(sb, err); |
| goto errout; |
| } |
| |
| /* ext4_reserve_inode_write() gets a reference on the iloc */ |
| err = ext4_reserve_inode_write(handle, inode, &iloc); |
| if (unlikely(err)) |
| goto errout; |
| |
| n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
| sizeof(struct buffer_head *), |
| GFP_NOFS); |
| if (!n_group_desc) { |
| err = -ENOMEM; |
| ext4_warning(sb, "not enough memory for %lu groups", |
| gdb_num + 1); |
| goto errout; |
| } |
| |
| /* |
| * Finally, we have all of the possible failures behind us... |
| * |
| * Remove new GDT block from inode double-indirect block and clear out |
| * the new GDT block for use (which also "frees" the backup GDT blocks |
| * from the reserved inode). We don't need to change the bitmaps for |
| * these blocks, because they are marked as in-use from being in the |
| * reserved inode, and will become GDT blocks (primary and backup). |
| */ |
| data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
| err = ext4_handle_dirty_metadata(handle, NULL, dind); |
| if (unlikely(err)) { |
| ext4_std_error(sb, err); |
| goto errout; |
| } |
| inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> |
| (9 - EXT4_SB(sb)->s_cluster_bits); |
| ext4_mark_iloc_dirty(handle, inode, &iloc); |
| memset(gdb_bh->b_data, 0, sb->s_blocksize); |
| err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); |
| if (unlikely(err)) { |
| ext4_std_error(sb, err); |
| iloc.bh = NULL; |
| goto errout; |
| } |
| brelse(dind); |
| |
| rcu_read_lock(); |
| o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); |
| memcpy(n_group_desc, o_group_desc, |
| EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
| rcu_read_unlock(); |
| n_group_desc[gdb_num] = gdb_bh; |
| rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); |
| EXT4_SB(sb)->s_gdb_count++; |
| ext4_kvfree_array_rcu(o_group_desc); |
| |
| le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
| err = ext4_handle_dirty_super(handle, sb); |
| if (err) |
| ext4_std_error(sb, err); |
| return err; |
| errout: |
| kvfree(n_group_desc); |
| brelse(iloc.bh); |
| brelse(dind); |
| brelse(gdb_bh); |
| |
| ext4_debug("leaving with error %d\n", err); |
| return err; |
| } |
| |
| /* |
| * add_new_gdb_meta_bg is the sister of add_new_gdb. |
| */ |
| static int add_new_gdb_meta_bg(struct super_block *sb, |
| handle_t *handle, ext4_group_t group) { |
| ext4_fsblk_t gdblock; |
| struct buffer_head *gdb_bh; |
| struct buffer_head **o_group_desc, **n_group_desc; |
| unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| int err; |
| |
| gdblock = ext4_meta_bg_first_block_no(sb, group) + |
| ext4_bg_has_super(sb, group); |
| gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
| if (IS_ERR(gdb_bh)) |
| return PTR_ERR(gdb_bh); |
| n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
| sizeof(struct buffer_head *), |
| GFP_NOFS); |
| if (!n_group_desc) { |
| brelse(gdb_bh); |
| err = -ENOMEM; |
| ext4_warning(sb, "not enough memory for %lu groups", |
| gdb_num + 1); |
| return err; |
| } |
| |
| rcu_read_lock(); |
| o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); |
| memcpy(n_group_desc, o_group_desc, |
| EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
| rcu_read_unlock(); |
| n_group_desc[gdb_num] = gdb_bh; |
| |
| BUFFER_TRACE(gdb_bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, gdb_bh); |
| if (err) { |
| kvfree(n_group_desc); |
| brelse(gdb_bh); |
| return err; |
| } |
| |
| rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); |
| EXT4_SB(sb)->s_gdb_count++; |
| ext4_kvfree_array_rcu(o_group_desc); |
| return err; |
| } |
| |
| /* |
| * Called when we are adding a new group which has a backup copy of each of |
| * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. |
| * We need to add these reserved backup GDT blocks to the resize inode, so |
| * that they are kept for future resizing and not allocated to files. |
| * |
| * Each reserved backup GDT block will go into a different indirect block. |
| * The indirect blocks are actually the primary reserved GDT blocks, |
| * so we know in advance what their block numbers are. We only get the |
| * double-indirect block to verify it is pointing to the primary reserved |
| * GDT blocks so we don't overwrite a data block by accident. The reserved |
| * backup GDT blocks are stored in their reserved primary GDT block. |
| */ |
| static int reserve_backup_gdb(handle_t *handle, struct inode *inode, |
| ext4_group_t group) |
| { |
| struct super_block *sb = inode->i_sb; |
| int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
| int cluster_bits = EXT4_SB(sb)->s_cluster_bits; |
| struct buffer_head **primary; |
| struct buffer_head *dind; |
| struct ext4_iloc iloc; |
| ext4_fsblk_t blk; |
| __le32 *data, *end; |
| int gdbackups = 0; |
| int res, i; |
| int err; |
| |
| primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); |
| if (!primary) |
| return -ENOMEM; |
| |
| data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
| dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
| if (IS_ERR(dind)) { |
| err = PTR_ERR(dind); |
| dind = NULL; |
| goto exit_free; |
| } |
| |
| blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
| data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
| EXT4_ADDR_PER_BLOCK(sb)); |
| end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
| |
| /* Get each reserved primary GDT block and verify it holds backups */ |
| for (res = 0; res < reserved_gdb; res++, blk++) { |
| if (le32_to_cpu(*data) != blk) { |
| ext4_warning(sb, "reserved block %llu" |
| " not at offset %ld", |
| blk, |
| (long)(data - (__le32 *)dind->b_data)); |
| err = -EINVAL; |
| goto exit_bh; |
| } |
| primary[res] = ext4_sb_bread(sb, blk, 0); |
| if (IS_ERR(primary[res])) { |
| err = PTR_ERR(primary[res]); |
| primary[res] = NULL; |
| goto exit_bh; |
| } |
| gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
| if (gdbackups < 0) { |
| brelse(primary[res]); |
| err = gdbackups; |
| goto exit_bh; |
| } |
| if (++data >= end) |
| data = (__le32 *)dind->b_data; |
| } |
| |
| for (i = 0; i < reserved_gdb; i++) { |
| BUFFER_TRACE(primary[i], "get_write_access"); |
| if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
| goto exit_bh; |
| } |
| |
| if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
| goto exit_bh; |
| |
| /* |
| * Finally we can add each of the reserved backup GDT blocks from |
| * the new group to its reserved primary GDT block. |
| */ |
| blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
| for (i = 0; i < reserved_gdb; i++) { |
| int err2; |
| data = (__le32 *)primary[i]->b_data; |
| /* printk("reserving backup %lu[%u] = %lu\n", |
| primary[i]->b_blocknr, gdbackups, |
| blk + primary[i]->b_blocknr); */ |
| data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); |
| err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
| if (!err) |
| err = err2; |
| } |
| |
| inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); |
| ext4_mark_iloc_dirty(handle, inode, &iloc); |
| |
| exit_bh: |
| while (--res >= 0) |
| brelse(primary[res]); |
| brelse(dind); |
| |
| exit_free: |
| kfree(primary); |
| |
| return err; |
| } |
| |
| /* |
| * Update the backup copies of the ext4 metadata. These don't need to be part |
| * of the main resize transaction, because e2fsck will re-write them if there |
| * is a problem (basically only OOM will cause a problem). However, we |
| * _should_ update the backups if possible, in case the primary gets trashed |
| * for some reason and we need to run e2fsck from a backup superblock. The |
| * important part is that the new block and inode counts are in the backup |
| * superblocks, and the location of the new group metadata in the GDT backups. |
| * |
| * We do not need take the s_resize_lock for this, because these |
| * blocks are not otherwise touched by the filesystem code when it is |
| * mounted. We don't need to worry about last changing from |
| * sbi->s_groups_count, because the worst that can happen is that we |
| * do not copy the full number of backups at this time. The resize |
| * which changed s_groups_count will backup again. |
| */ |
| static void update_backups(struct super_block *sb, sector_t blk_off, char *data, |
| int size, int meta_bg) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_group_t last; |
| const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
| unsigned three = 1; |
| unsigned five = 5; |
| unsigned seven = 7; |
| ext4_group_t group = 0; |
| int rest = sb->s_blocksize - size; |
| handle_t *handle; |
| int err = 0, err2; |
| |
| handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
| if (IS_ERR(handle)) { |
| group = 1; |
| err = PTR_ERR(handle); |
| goto exit_err; |
| } |
| |
| if (meta_bg == 0) { |
| group = ext4_list_backups(sb, &three, &five, &seven); |
| last = sbi->s_groups_count; |
| } else { |
| group = ext4_get_group_number(sb, blk_off) + 1; |
| last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); |
| } |
| |
| while (group < sbi->s_groups_count) { |
| struct buffer_head *bh; |
| ext4_fsblk_t backup_block; |
| |
| /* Out of journal space, and can't get more - abort - so sad */ |
| if (ext4_handle_valid(handle) && |
| handle->h_buffer_credits == 0 && |
| ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
| (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) |
| break; |
| |
| if (meta_bg == 0) |
| backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; |
| else |
| backup_block = (ext4_group_first_block_no(sb, group) + |
| ext4_bg_has_super(sb, group)); |
| |
| bh = sb_getblk(sb, backup_block); |
| if (unlikely(!bh)) { |
| err = -ENOMEM; |
| break; |
| } |
| ext4_debug("update metadata backup %llu(+%llu)\n", |
| backup_block, backup_block - |
| ext4_group_first_block_no(sb, group)); |
| BUFFER_TRACE(bh, "get_write_access"); |
| if ((err = ext4_journal_get_write_access(handle, bh))) { |
| brelse(bh); |
| break; |
| } |
| lock_buffer(bh); |
| memcpy(bh->b_data, data, size); |
| if (rest) |
| memset(bh->b_data + size, 0, rest); |
| set_buffer_uptodate(bh); |
| unlock_buffer(bh); |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| if (unlikely(err)) |
| ext4_std_error(sb, err); |
| brelse(bh); |
| |
| if (meta_bg == 0) |
| group = ext4_list_backups(sb, &three, &five, &seven); |
| else if (group == last) |
| break; |
| else |
| group = last; |
| } |
| if ((err2 = ext4_journal_stop(handle)) && !err) |
| err = err2; |
| |
| /* |
| * Ugh! Need to have e2fsck write the backup copies. It is too |
| * late to revert the resize, we shouldn't fail just because of |
| * the backup copies (they are only needed in case of corruption). |
| * |
| * However, if we got here we have a journal problem too, so we |
| * can't really start a transaction to mark the superblock. |
| * Chicken out and just set the flag on the hope it will be written |
| * to disk, and if not - we will simply wait until next fsck. |
| */ |
| exit_err: |
| if (err) { |
| ext4_warning(sb, "can't update backup for group %u (err %d), " |
| "forcing fsck on next reboot", group, err); |
| sbi->s_mount_state &= ~EXT4_VALID_FS; |
| sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); |
| mark_buffer_dirty(sbi->s_sbh); |
| } |
| } |
| |
| /* |
| * ext4_add_new_descs() adds @count group descriptor of groups |
| * starting at @group |
| * |
| * @handle: journal handle |
| * @sb: super block |
| * @group: the group no. of the first group desc to be added |
| * @resize_inode: the resize inode |
| * @count: number of group descriptors to be added |
| */ |
| static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, |
| ext4_group_t group, struct inode *resize_inode, |
| ext4_group_t count) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| struct buffer_head *gdb_bh; |
| int i, gdb_off, gdb_num, err = 0; |
| int meta_bg; |
| |
| meta_bg = ext4_has_feature_meta_bg(sb); |
| for (i = 0; i < count; i++, group++) { |
| int reserved_gdb = ext4_bg_has_super(sb, group) ? |
| le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
| |
| gdb_off = group % EXT4_DESC_PER_BLOCK(sb); |
| gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| |
| /* |
| * We will only either add reserved group blocks to a backup group |
| * or remove reserved blocks for the first group in a new group block. |
| * Doing both would be mean more complex code, and sane people don't |
| * use non-sparse filesystems anymore. This is already checked above. |
| */ |
| if (gdb_off) { |
| gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, |
| gdb_num); |
| BUFFER_TRACE(gdb_bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, gdb_bh); |
| |
| if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) |
| err = reserve_backup_gdb(handle, resize_inode, group); |
| } else if (meta_bg != 0) { |
| err = add_new_gdb_meta_bg(sb, handle, group); |
| } else { |
| err = add_new_gdb(handle, resize_inode, group); |
| } |
| if (err) |
| break; |
| } |
| return err; |
| } |
| |
| static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
| { |
| struct buffer_head *bh = sb_getblk(sb, block); |
| if (unlikely(!bh)) |
| return NULL; |
| if (!bh_uptodate_or_lock(bh)) { |
| if (bh_submit_read(bh) < 0) { |
| brelse(bh); |
| return NULL; |
| } |
| } |
| |
| return bh; |
| } |
| |
| static int ext4_set_bitmap_checksums(struct super_block *sb, |
| ext4_group_t group, |
| struct ext4_group_desc *gdp, |
| struct ext4_new_group_data *group_data) |
| { |
| struct buffer_head *bh; |
| |
| if (!ext4_has_metadata_csum(sb)) |
| return 0; |
| |
| bh = ext4_get_bitmap(sb, group_data->inode_bitmap); |
| if (!bh) |
| return -EIO; |
| ext4_inode_bitmap_csum_set(sb, group, gdp, bh, |
| EXT4_INODES_PER_GROUP(sb) / 8); |
| brelse(bh); |
| |
| bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
| if (!bh) |
| return -EIO; |
| ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
| brelse(bh); |
| |
| return 0; |
| } |
| |
| /* |
| * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg |
| */ |
| static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, |
| struct ext4_new_flex_group_data *flex_gd) |
| { |
| struct ext4_new_group_data *group_data = flex_gd->groups; |
| struct ext4_group_desc *gdp; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct buffer_head *gdb_bh; |
| ext4_group_t group; |
| __u16 *bg_flags = flex_gd->bg_flags; |
| int i, gdb_off, gdb_num, err = 0; |
| |
| |
| for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { |
| group = group_data->group; |
| |
| gdb_off = group % EXT4_DESC_PER_BLOCK(sb); |
| gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| |
| /* |
| * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). |
| */ |
| gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); |
| /* Update group descriptor block for new group */ |
| gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
| gdb_off * EXT4_DESC_SIZE(sb)); |
| |
| memset(gdp, 0, EXT4_DESC_SIZE(sb)); |
| ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); |
| ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); |
| err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
| if (err) { |
| ext4_std_error(sb, err); |
| break; |
| } |
| |
| ext4_inode_table_set(sb, gdp, group_data->inode_table); |
| ext4_free_group_clusters_set(sb, gdp, |
| group_data->free_clusters_count); |
| ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
| if (ext4_has_group_desc_csum(sb)) |
| ext4_itable_unused_set(sb, gdp, |
| EXT4_INODES_PER_GROUP(sb)); |
| gdp->bg_flags = cpu_to_le16(*bg_flags); |
| ext4_group_desc_csum_set(sb, group, gdp); |
| |
| err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); |
| if (unlikely(err)) { |
| ext4_std_error(sb, err); |
| break; |
| } |
| |
| /* |
| * We can allocate memory for mb_alloc based on the new group |
| * descriptor |
| */ |
| err = ext4_mb_add_groupinfo(sb, group, gdp); |
| if (err) |
| break; |
| } |
| return err; |
| } |
| |
| /* |
| * ext4_update_super() updates the super block so that the newly added |
| * groups can be seen by the filesystem. |
| * |
| * @sb: super block |
| * @flex_gd: new added groups |
| */ |
| static void ext4_update_super(struct super_block *sb, |
| struct ext4_new_flex_group_data *flex_gd) |
| { |
| ext4_fsblk_t blocks_count = 0; |
| ext4_fsblk_t free_blocks = 0; |
| ext4_fsblk_t reserved_blocks = 0; |
| struct ext4_new_group_data *group_data = flex_gd->groups; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int i; |
| |
| BUG_ON(flex_gd->count == 0 || group_data == NULL); |
| /* |
| * Make the new blocks and inodes valid next. We do this before |
| * increasing the group count so that once the group is enabled, |
| * all of its blocks and inodes are already valid. |
| * |
| * We always allocate group-by-group, then block-by-block or |
| * inode-by-inode within a group, so enabling these |
| * blocks/inodes before the group is live won't actually let us |
| * allocate the new space yet. |
| */ |
| for (i = 0; i < flex_gd->count; i++) { |
| blocks_count += group_data[i].blocks_count; |
| free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); |
| } |
| |
| reserved_blocks = ext4_r_blocks_count(es) * 100; |
| reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
| reserved_blocks *= blocks_count; |
| do_div(reserved_blocks, 100); |
| |
| ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); |
| ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
| le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
| flex_gd->count); |
| le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
| flex_gd->count); |
| |
| ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
| /* |
| * We need to protect s_groups_count against other CPUs seeing |
| * inconsistent state in the superblock. |
| * |
| * The precise rules we use are: |
| * |
| * * Writers must perform a smp_wmb() after updating all |
| * dependent data and before modifying the groups count |
| * |
| * * Readers must perform an smp_rmb() after reading the groups |
| * count and before reading any dependent data. |
| * |
| * NB. These rules can be relaxed when checking the group count |
| * while freeing data, as we can only allocate from a block |
| * group after serialising against the group count, and we can |
| * only then free after serialising in turn against that |
| * allocation. |
| */ |
| smp_wmb(); |
| |
| /* Update the global fs size fields */ |
| sbi->s_groups_count += flex_gd->count; |
| sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
| (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); |
| |
| /* Update the reserved block counts only once the new group is |
| * active. */ |
| ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + |
| reserved_blocks); |
| |
| /* Update the free space counts */ |
| percpu_counter_add(&sbi->s_freeclusters_counter, |
| EXT4_NUM_B2C(sbi, free_blocks)); |
| percpu_counter_add(&sbi->s_freeinodes_counter, |
| EXT4_INODES_PER_GROUP(sb) * flex_gd->count); |
| |
| ext4_debug("free blocks count %llu", |
| percpu_counter_read(&sbi->s_freeclusters_counter)); |
| if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { |
| ext4_group_t flex_group; |
| struct flex_groups *fg; |
| |
| flex_group = ext4_flex_group(sbi, group_data[0].group); |
| fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); |
| atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
| &fg->free_clusters); |
| atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
| &fg->free_inodes); |
| } |
| |
| /* |
| * Update the fs overhead information |
| */ |
| ext4_calculate_overhead(sb); |
| |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_DEBUG "EXT4-fs: added group %u:" |
| "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, |
| blocks_count, free_blocks, reserved_blocks); |
| } |
| |
| /* Add a flex group to an fs. Ensure we handle all possible error conditions |
| * _before_ we start modifying the filesystem, because we cannot abort the |
| * transaction and not have it write the data to disk. |
| */ |
| static int ext4_flex_group_add(struct super_block *sb, |
| struct inode *resize_inode, |
| struct ext4_new_flex_group_data *flex_gd) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| ext4_fsblk_t o_blocks_count; |
| ext4_grpblk_t last; |
| ext4_group_t group; |
| handle_t *handle; |
| unsigned reserved_gdb; |
| int err = 0, err2 = 0, credit; |
| |
| BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); |
| |
| reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); |
| o_blocks_count = ext4_blocks_count(es); |
| ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
| BUG_ON(last); |
| |
| err = setup_new_flex_group_blocks(sb, flex_gd); |
| if (err) |
| goto exit; |
| /* |
| * We will always be modifying at least the superblock and GDT |
| * blocks. If we are adding a group past the last current GDT block, |
| * we will also modify the inode and the dindirect block. If we |
| * are adding a group with superblock/GDT backups we will also |
| * modify each of the reserved GDT dindirect blocks. |
| */ |
| credit = 3; /* sb, resize inode, resize inode dindirect */ |
| /* GDT blocks */ |
| credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); |
| credit += reserved_gdb; /* Reserved GDT dindirect blocks */ |
| handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
| if (IS_ERR(handle)) { |
| err = PTR_ERR(handle); |
| goto exit; |
| } |
| |
| BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
| if (err) |
| goto exit_journal; |
| |
| group = flex_gd->groups[0].group; |
| BUG_ON(group != sbi->s_groups_count); |
| err = ext4_add_new_descs(handle, sb, group, |
| resize_inode, flex_gd->count); |
| if (err) |
| goto exit_journal; |
| |
| err = ext4_setup_new_descs(handle, sb, flex_gd); |
| if (err) |
| goto exit_journal; |
| |
| ext4_update_super(sb, flex_gd); |
| |
| err = ext4_handle_dirty_super(handle, sb); |
| |
| exit_journal: |
| err2 = ext4_journal_stop(handle); |
| if (!err) |
| err = err2; |
| |
| if (!err) { |
| int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| int gdb_num_end = ((group + flex_gd->count - 1) / |
| EXT4_DESC_PER_BLOCK(sb)); |
| int meta_bg = ext4_has_feature_meta_bg(sb); |
| sector_t old_gdb = 0; |
| |
| update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
| sizeof(struct ext4_super_block), 0); |
| for (; gdb_num <= gdb_num_end; gdb_num++) { |
| struct buffer_head *gdb_bh; |
| |
| gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, |
| gdb_num); |
| if (old_gdb == gdb_bh->b_blocknr) |
| continue; |
| update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
| gdb_bh->b_size, meta_bg); |
| old_gdb = gdb_bh->b_blocknr; |
| } |
| } |
| exit: |
| return err; |
| } |
| |
| static int ext4_setup_next_flex_gd(struct super_block *sb, |
| struct ext4_new_flex_group_data *flex_gd, |
| ext4_fsblk_t n_blocks_count, |
| unsigned long flexbg_size) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| struct ext4_new_group_data *group_data = flex_gd->groups; |
| ext4_fsblk_t o_blocks_count; |
| ext4_group_t n_group; |
| ext4_group_t group; |
| ext4_group_t last_group; |
| ext4_grpblk_t last; |
| ext4_grpblk_t clusters_per_group; |
| unsigned long i; |
| |
| clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); |
| |
| o_blocks_count = ext4_blocks_count(es); |
| |
| if (o_blocks_count == n_blocks_count) |
| return 0; |
| |
| ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
| BUG_ON(last); |
| ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); |
| |
| last_group = group | (flexbg_size - 1); |
| if (last_group > n_group) |
| last_group = n_group; |
| |
| flex_gd->count = last_group - group + 1; |
| |
| for (i = 0; i < flex_gd->count; i++) { |
| int overhead; |
| |
| group_data[i].group = group + i; |
| group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); |
| overhead = ext4_group_overhead_blocks(sb, group + i); |
| group_data[i].mdata_blocks = overhead; |
| group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); |
| if (ext4_has_group_desc_csum(sb)) { |
| flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
| EXT4_BG_INODE_UNINIT; |
| if (!test_opt(sb, INIT_INODE_TABLE)) |
| flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; |
| } else |
| flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
| } |
| |
| if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
| /* We need to initialize block bitmap of last group. */ |
| flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; |
| |
| if ((last_group == n_group) && (last != clusters_per_group - 1)) { |
| group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); |
| group_data[i - 1].free_clusters_count -= clusters_per_group - |
| last - 1; |
| } |
| |
| return 1; |
| } |
| |
| /* Add group descriptor data to an existing or new group descriptor block. |
| * Ensure we handle all possible error conditions _before_ we start modifying |
| * the filesystem, because we cannot abort the transaction and not have it |
| * write the data to disk. |
| * |
| * If we are on a GDT block boundary, we need to get the reserved GDT block. |
| * Otherwise, we may need to add backup GDT blocks for a sparse group. |
| * |
| * We only need to hold the superblock lock while we are actually adding |
| * in the new group's counts to the superblock. Prior to that we have |
| * not really "added" the group at all. We re-check that we are still |
| * adding in the last group in case things have changed since verifying. |
| */ |
| int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
| { |
| struct ext4_new_flex_group_data flex_gd; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int reserved_gdb = ext4_bg_has_super(sb, input->group) ? |
| le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
| struct inode *inode = NULL; |
| int gdb_off; |
| int err; |
| __u16 bg_flags = 0; |
| |
| gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
| |
| if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { |
| ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
| return -EPERM; |
| } |
| |
| if (ext4_blocks_count(es) + input->blocks_count < |
| ext4_blocks_count(es)) { |
| ext4_warning(sb, "blocks_count overflow"); |
| return -EINVAL; |
| } |
| |
| if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
| le32_to_cpu(es->s_inodes_count)) { |
| ext4_warning(sb, "inodes_count overflow"); |
| return -EINVAL; |
| } |
| |
| if (reserved_gdb || gdb_off == 0) { |
| if (!ext4_has_feature_resize_inode(sb) || |
| !le16_to_cpu(es->s_reserved_gdt_blocks)) { |
| ext4_warning(sb, |
| "No reserved GDT blocks, can't resize"); |
| return -EPERM; |
| } |
| inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); |
| if (IS_ERR(inode)) { |
| ext4_warning(sb, "Error opening resize inode"); |
| return PTR_ERR(inode); |
| } |
| } |
| |
| |
| err = verify_group_input(sb, input); |
| if (err) |
| goto out; |
| |
| err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
| if (err) |
| goto out; |
| |
| err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
| if (err) |
| goto out; |
| |
| flex_gd.count = 1; |
| flex_gd.groups = input; |
| flex_gd.bg_flags = &bg_flags; |
| err = ext4_flex_group_add(sb, inode, &flex_gd); |
| out: |
| iput(inode); |
| return err; |
| } /* ext4_group_add */ |
| |
| /* |
| * extend a group without checking assuming that checking has been done. |
| */ |
| static int ext4_group_extend_no_check(struct super_block *sb, |
| ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| handle_t *handle; |
| int err = 0, err2; |
| |
| /* We will update the superblock, one block bitmap, and |
| * one group descriptor via ext4_group_add_blocks(). |
| */ |
| handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
| if (IS_ERR(handle)) { |
| err = PTR_ERR(handle); |
| ext4_warning(sb, "error %d on journal start", err); |
| return err; |
| } |
| |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
| if (err) { |
| ext4_warning(sb, "error %d on journal write access", err); |
| goto errout; |
| } |
| |
| ext4_blocks_count_set(es, o_blocks_count + add); |
| ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
| ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
| o_blocks_count + add); |
| /* We add the blocks to the bitmap and set the group need init bit */ |
| err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); |
| if (err) |
| goto errout; |
| ext4_handle_dirty_super(handle, sb); |
| ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, |
| o_blocks_count + add); |
| errout: |
| err2 = ext4_journal_stop(handle); |
| if (err2 && !err) |
| err = err2; |
| |
| if (!err) { |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_DEBUG "EXT4-fs: extended group to %llu " |
| "blocks\n", ext4_blocks_count(es)); |
| update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
| (char *)es, sizeof(struct ext4_super_block), 0); |
| } |
| return err; |
| } |
| |
| /* |
| * Extend the filesystem to the new number of blocks specified. This entry |
| * point is only used to extend the current filesystem to the end of the last |
| * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" |
| * for emergencies (because it has no dependencies on reserved blocks). |
| * |
| * If we _really_ wanted, we could use default values to call ext4_group_add() |
| * allow the "remount" trick to work for arbitrary resizing, assuming enough |
| * GDT blocks are reserved to grow to the desired size. |
| */ |
| int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
| ext4_fsblk_t n_blocks_count) |
| { |
| ext4_fsblk_t o_blocks_count; |
| ext4_grpblk_t last; |
| ext4_grpblk_t add; |
| struct buffer_head *bh; |
| int err; |
| ext4_group_t group; |
| |
| o_blocks_count = ext4_blocks_count(es); |
| |
| if (test_opt(sb, DEBUG)) |
| ext4_msg(sb, KERN_DEBUG, |
| "extending last group from %llu to %llu blocks", |
| o_blocks_count, n_blocks_count); |
| |
| if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) |
| return 0; |
| |
| if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
| ext4_msg(sb, KERN_ERR, |
| "filesystem too large to resize to %llu blocks safely", |
| n_blocks_count); |
| return -EINVAL; |
| } |
| |
| if (n_blocks_count < o_blocks_count) { |
| ext4_warning(sb, "can't shrink FS - resize aborted"); |
| return -EINVAL; |
| } |
| |
| /* Handle the remaining blocks in the last group only. */ |
| ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
| |
| if (last == 0) { |
| ext4_warning(sb, "need to use ext2online to resize further"); |
| return -EPERM; |
| } |
| |
| add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
| |
| if (o_blocks_count + add < o_blocks_count) { |
| ext4_warning(sb, "blocks_count overflow"); |
| return -EINVAL; |
| } |
| |
| if (o_blocks_count + add > n_blocks_count) |
| add = n_blocks_count - o_blocks_count; |
| |
| if (o_blocks_count + add < n_blocks_count) |
| ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
| o_blocks_count + add, add); |
| |
| /* See if the device is actually as big as what was requested */ |
| bh = sb_bread(sb, o_blocks_count + add - 1); |
| if (!bh) { |
| ext4_warning(sb, "can't read last block, resize aborted"); |
| return -ENOSPC; |
| } |
| brelse(bh); |
| |
| err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
| return err; |
| } /* ext4_group_extend */ |
| |
| |
| static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) |
| { |
| return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); |
| } |
| |
| /* |
| * Release the resize inode and drop the resize_inode feature if there |
| * are no more reserved gdt blocks, and then convert the file system |
| * to enable meta_bg |
| */ |
| static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) |
| { |
| handle_t *handle; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| struct ext4_inode_info *ei = EXT4_I(inode); |
| ext4_fsblk_t nr; |
| int i, ret, err = 0; |
| int credits = 1; |
| |
| ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); |
| if (inode) { |
| if (es->s_reserved_gdt_blocks) { |
| ext4_error(sb, "Unexpected non-zero " |
| "s_reserved_gdt_blocks"); |
| return -EPERM; |
| } |
| |
| /* Do a quick sanity check of the resize inode */ |
| if (inode->i_blocks != 1 << (inode->i_blkbits - |
| (9 - sbi->s_cluster_bits))) |
| goto invalid_resize_inode; |
| for (i = 0; i < EXT4_N_BLOCKS; i++) { |
| if (i == EXT4_DIND_BLOCK) { |
| if (ei->i_data[i]) |
| continue; |
| else |
| goto invalid_resize_inode; |
| } |
| if (ei->i_data[i]) |
| goto invalid_resize_inode; |
| } |
| credits += 3; /* block bitmap, bg descriptor, resize inode */ |
| } |
| |
| handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| |
| BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
| if (err) |
| goto errout; |
| |
| ext4_clear_feature_resize_inode(sb); |
| ext4_set_feature_meta_bg(sb); |
| sbi->s_es->s_first_meta_bg = |
| cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); |
| |
| err = ext4_handle_dirty_super(handle, sb); |
| if (err) { |
| ext4_std_error(sb, err); |
| goto errout; |
| } |
| |
| if (inode) { |
| nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); |
| ext4_free_blocks(handle, inode, NULL, nr, 1, |
| EXT4_FREE_BLOCKS_METADATA | |
| EXT4_FREE_BLOCKS_FORGET); |
| ei->i_data[EXT4_DIND_BLOCK] = 0; |
| inode->i_blocks = 0; |
| |
| err = ext4_mark_inode_dirty(handle, inode); |
| if (err) |
| ext4_std_error(sb, err); |
| } |
| |
| errout: |
| ret = ext4_journal_stop(handle); |
| if (!err) |
| err = ret; |
| return ret; |
| |
| invalid_resize_inode: |
| ext4_error(sb, "corrupted/inconsistent resize inode"); |
| return -EINVAL; |
| } |
| |
| /* |
| * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count |
| * |
| * @sb: super block of the fs to be resized |
| * @n_blocks_count: the number of blocks resides in the resized fs |
| */ |
| int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) |
| { |
| struct ext4_new_flex_group_data *flex_gd = NULL; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| struct buffer_head *bh; |
| struct inode *resize_inode = NULL; |
| ext4_grpblk_t add, offset; |
| unsigned long n_desc_blocks; |
| unsigned long o_desc_blocks; |
| ext4_group_t o_group; |
| ext4_group_t n_group; |
| ext4_fsblk_t o_blocks_count; |
| ext4_fsblk_t n_blocks_count_retry = 0; |
| unsigned long last_update_time = 0; |
| int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
| int meta_bg; |
| |
| /* See if the device is actually as big as what was requested */ |
| bh = sb_bread(sb, n_blocks_count - 1); |
| if (!bh) { |
| ext4_warning(sb, "can't read last block, resize aborted"); |
| return -ENOSPC; |
| } |
| brelse(bh); |
| |
| retry: |
| o_blocks_count = ext4_blocks_count(es); |
| |
| ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
| "to %llu blocks", o_blocks_count, n_blocks_count); |
| |
| if (n_blocks_count < o_blocks_count) { |
| /* On-line shrinking not supported */ |
| ext4_warning(sb, "can't shrink FS - resize aborted"); |
| return -EINVAL; |
| } |
| |
| if (n_blocks_count == o_blocks_count) |
| /* Nothing need to do */ |
| return 0; |
| |
| n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
| if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
| ext4_warning(sb, "resize would cause inodes_count overflow"); |
| return -EINVAL; |
| } |
| ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
| |
| n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
| o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); |
| |
| meta_bg = ext4_has_feature_meta_bg(sb); |
| |
| if (ext4_has_feature_resize_inode(sb)) { |
| if (meta_bg) { |
| ext4_error(sb, "resize_inode and meta_bg enabled " |
| "simultaneously"); |
| return -EINVAL; |
| } |
| if (n_desc_blocks > o_desc_blocks + |
| le16_to_cpu(es->s_reserved_gdt_blocks)) { |
| n_blocks_count_retry = n_blocks_count; |
| n_desc_blocks = o_desc_blocks + |
| le16_to_cpu(es->s_reserved_gdt_blocks); |
| n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); |
| n_blocks_count = (ext4_fsblk_t)n_group * |
| EXT4_BLOCKS_PER_GROUP(sb) + |
| le32_to_cpu(es->s_first_data_block); |
| n_group--; /* set to last group number */ |
| } |
| |
| if (!resize_inode) |
| resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, |
| EXT4_IGET_SPECIAL); |
| if (IS_ERR(resize_inode)) { |
| ext4_warning(sb, "Error opening resize inode"); |
| return PTR_ERR(resize_inode); |
| } |
| } |
| |
| if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
| err = ext4_convert_meta_bg(sb, resize_inode); |
| if (err) |
| goto out; |
| if (resize_inode) { |
| iput(resize_inode); |
| resize_inode = NULL; |
| } |
| if (n_blocks_count_retry) { |
| n_blocks_count = n_blocks_count_retry; |
| n_blocks_count_retry = 0; |
| goto retry; |
| } |
| } |
| |
| /* |
| * Make sure the last group has enough space so that it's |
| * guaranteed to have enough space for all metadata blocks |
| * that it might need to hold. (We might not need to store |
| * the inode table blocks in the last block group, but there |
| * will be cases where this might be needed.) |
| */ |
| if ((ext4_group_first_block_no(sb, n_group) + |
| ext4_group_overhead_blocks(sb, n_group) + 2 + |
| sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { |
| n_blocks_count = ext4_group_first_block_no(sb, n_group); |
| n_group--; |
| n_blocks_count_retry = 0; |
| if (resize_inode) { |
| iput(resize_inode); |
| resize_inode = NULL; |
| } |
| goto retry; |
| } |
| |
| /* extend the last group */ |
| if (n_group == o_group) |
| add = n_blocks_count - o_blocks_count; |
| else |
| add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); |
| if (add > 0) { |
| err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
| if (err) |
| goto out; |
| } |
| |
| if (ext4_blocks_count(es) == n_blocks_count) |
| goto out; |
| |
| err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
| if (err) |
| goto out; |
| |
| err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
| if (err) |
| goto out; |
| |
| flex_gd = alloc_flex_gd(flexbg_size); |
| if (flex_gd == NULL) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| /* Add flex groups. Note that a regular group is a |
| * flex group with 1 group. |
| */ |
| while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, |
| flexbg_size)) { |
| if (jiffies - last_update_time > HZ * 10) { |
| if (last_update_time) |
| ext4_msg(sb, KERN_INFO, |
| "resized to %llu blocks", |
| ext4_blocks_count(es)); |
| last_update_time = jiffies; |
| } |
| if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
| break; |
| err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
| if (unlikely(err)) |
| break; |
| } |
| |
| if (!err && n_blocks_count_retry) { |
| n_blocks_count = n_blocks_count_retry; |
| n_blocks_count_retry = 0; |
| free_flex_gd(flex_gd); |
| flex_gd = NULL; |
| if (resize_inode) { |
| iput(resize_inode); |
| resize_inode = NULL; |
| } |
| goto retry; |
| } |
| |
| out: |
| if (flex_gd) |
| free_flex_gd(flex_gd); |
| if (resize_inode != NULL) |
| iput(resize_inode); |
| if (err) |
| ext4_warning(sb, "error (%d) occurred during " |
| "file system resize", err); |
| ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", |
| ext4_blocks_count(es)); |
| return err; |
| } |