Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/resize.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 4 | * Support for resizing an ext4 filesystem while it is mounted. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> |
| 7 | * |
| 8 | * This could probably be made into a module, because it is not often in use. |
| 9 | */ |
| 10 | |
| 11 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 12 | #define EXT4FS_DEBUG |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 13 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 14 | #include <linux/errno.h> |
| 15 | #include <linux/slab.h> |
| 16 | |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 17 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 18 | |
Yongqiang Yang | 8f82f84 | 2011-07-26 21:35:44 -0400 | [diff] [blame] | 19 | int ext4_resize_begin(struct super_block *sb) |
| 20 | { |
| 21 | int ret = 0; |
| 22 | |
| 23 | if (!capable(CAP_SYS_RESOURCE)) |
| 24 | return -EPERM; |
| 25 | |
Yongqiang Yang | ce723c3 | 2011-07-26 21:39:09 -0400 | [diff] [blame] | 26 | /* |
| 27 | * We are not allowed to do online-resizing on a filesystem mounted |
| 28 | * with error, because it can destroy the filesystem easily. |
| 29 | */ |
| 30 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
| 31 | ext4_warning(sb, "There are errors in the filesystem, " |
| 32 | "so online resizing is not allowed\n"); |
| 33 | return -EPERM; |
| 34 | } |
| 35 | |
Yongqiang Yang | 8f82f84 | 2011-07-26 21:35:44 -0400 | [diff] [blame] | 36 | if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) |
| 37 | ret = -EBUSY; |
| 38 | |
| 39 | return ret; |
| 40 | } |
| 41 | |
| 42 | void ext4_resize_end(struct super_block *sb) |
| 43 | { |
| 44 | clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags); |
| 45 | smp_mb__after_clear_bit(); |
| 46 | } |
| 47 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 48 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
| 49 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) |
| 50 | |
| 51 | static int verify_group_input(struct super_block *sb, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 52 | struct ext4_new_group_data *input) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 53 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 54 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 55 | struct ext4_super_block *es = sbi->s_es; |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 56 | ext4_fsblk_t start = ext4_blocks_count(es); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 57 | ext4_fsblk_t end = start + input->blocks_count; |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 58 | ext4_group_t group = input->group; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 59 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
| 60 | unsigned overhead = ext4_bg_has_super(sb, group) ? |
| 61 | (1 + ext4_bg_num_gdb(sb, group) + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 62 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 63 | ext4_fsblk_t metaend = start + overhead; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 64 | struct buffer_head *bh = NULL; |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 65 | ext4_grpblk_t free_blocks_count, offset; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 66 | int err = -EINVAL; |
| 67 | |
| 68 | input->free_blocks_count = free_blocks_count = |
| 69 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
| 70 | |
| 71 | if (test_opt(sb, DEBUG)) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 72 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 73 | "(%d free, %u reserved)\n", |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 74 | ext4_bg_has_super(sb, input->group) ? "normal" : |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 75 | "no-super", input->group, input->blocks_count, |
| 76 | free_blocks_count, input->reserved_blocks); |
| 77 | |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 78 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 79 | if (group != sbi->s_groups_count) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 80 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 81 | input->group, sbi->s_groups_count); |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 82 | else if (offset != 0) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 83 | ext4_warning(sb, "Last group not full"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 84 | else if (input->reserved_blocks > input->blocks_count / 5) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 85 | ext4_warning(sb, "Reserved blocks too high (%u)", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 86 | input->reserved_blocks); |
| 87 | else if (free_blocks_count < 0) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 88 | ext4_warning(sb, "Bad blocks count %u", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 89 | input->blocks_count); |
| 90 | else if (!(bh = sb_bread(sb, end - 1))) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 91 | ext4_warning(sb, "Cannot read last block (%llu)", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 92 | end - 1); |
| 93 | else if (outside(input->block_bitmap, start, end)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 94 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 95 | (unsigned long long)input->block_bitmap); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 96 | else if (outside(input->inode_bitmap, start, end)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 97 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 98 | (unsigned long long)input->inode_bitmap); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 99 | else if (outside(input->inode_table, start, end) || |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 100 | outside(itend - 1, start, end)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 101 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 102 | (unsigned long long)input->inode_table, itend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 103 | else if (input->inode_bitmap == input->block_bitmap) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 104 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 105 | (unsigned long long)input->block_bitmap); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 106 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 107 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
| 108 | "(%llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 109 | (unsigned long long)input->block_bitmap, |
| 110 | (unsigned long long)input->inode_table, itend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 111 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 112 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
| 113 | "(%llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 114 | (unsigned long long)input->inode_bitmap, |
| 115 | (unsigned long long)input->inode_table, itend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 116 | else if (inside(input->block_bitmap, start, metaend)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 117 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 118 | (unsigned long long)input->block_bitmap, |
| 119 | start, metaend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 120 | else if (inside(input->inode_bitmap, start, metaend)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 121 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 122 | (unsigned long long)input->inode_bitmap, |
| 123 | start, metaend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 124 | else if (inside(input->inode_table, start, metaend) || |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 125 | inside(itend - 1, start, metaend)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 126 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
| 127 | "(%llu-%llu)", |
Randy Dunlap | 1939e49 | 2006-10-28 10:38:26 -0700 | [diff] [blame] | 128 | (unsigned long long)input->inode_table, |
| 129 | itend - 1, start, metaend - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 130 | else |
| 131 | err = 0; |
| 132 | brelse(bh); |
| 133 | |
| 134 | return err; |
| 135 | } |
| 136 | |
Yongqiang Yang | 28c7bac | 2012-01-03 23:22:50 -0500 | [diff] [blame] | 137 | /* |
| 138 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex |
| 139 | * group each time. |
| 140 | */ |
| 141 | struct ext4_new_flex_group_data { |
| 142 | struct ext4_new_group_data *groups; /* new_group_data for groups |
| 143 | in the flex group */ |
| 144 | __u16 *bg_flags; /* block group flags of groups |
| 145 | in @groups */ |
| 146 | ext4_group_t count; /* number of groups in @groups |
| 147 | */ |
| 148 | }; |
| 149 | |
| 150 | /* |
| 151 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of |
| 152 | * @flexbg_size. |
| 153 | * |
| 154 | * Returns NULL on failure otherwise address of the allocated structure. |
| 155 | */ |
| 156 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) |
| 157 | { |
| 158 | struct ext4_new_flex_group_data *flex_gd; |
| 159 | |
| 160 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); |
| 161 | if (flex_gd == NULL) |
| 162 | goto out3; |
| 163 | |
Haogang Chen | 967ac8a | 2012-05-28 14:21:55 -0400 | [diff] [blame] | 164 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) |
| 165 | goto out2; |
Yongqiang Yang | 28c7bac | 2012-01-03 23:22:50 -0500 | [diff] [blame] | 166 | flex_gd->count = flexbg_size; |
| 167 | |
| 168 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * |
| 169 | flexbg_size, GFP_NOFS); |
| 170 | if (flex_gd->groups == NULL) |
| 171 | goto out2; |
| 172 | |
| 173 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); |
| 174 | if (flex_gd->bg_flags == NULL) |
| 175 | goto out1; |
| 176 | |
| 177 | return flex_gd; |
| 178 | |
| 179 | out1: |
| 180 | kfree(flex_gd->groups); |
| 181 | out2: |
| 182 | kfree(flex_gd); |
| 183 | out3: |
| 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) |
| 188 | { |
| 189 | kfree(flex_gd->bg_flags); |
| 190 | kfree(flex_gd->groups); |
| 191 | kfree(flex_gd); |
| 192 | } |
| 193 | |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 194 | /* |
| 195 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps |
| 196 | * and inode tables for a flex group. |
| 197 | * |
| 198 | * This function is used by 64bit-resize. Note that this function allocates |
| 199 | * group tables from the 1st group of groups contained by @flexgd, which may |
| 200 | * be a partial of a flex group. |
| 201 | * |
| 202 | * @sb: super block of fs to which the groups belongs |
Yongqiang Yang | 03c1c29 | 2012-09-05 01:21:50 -0400 | [diff] [blame] | 203 | * |
| 204 | * Returns 0 on a successful allocation of the metadata blocks in the |
| 205 | * block group. |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 206 | */ |
Yongqiang Yang | 03c1c29 | 2012-09-05 01:21:50 -0400 | [diff] [blame] | 207 | static int ext4_alloc_group_tables(struct super_block *sb, |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 208 | struct ext4_new_flex_group_data *flex_gd, |
| 209 | int flexbg_size) |
| 210 | { |
| 211 | struct ext4_new_group_data *group_data = flex_gd->groups; |
| 212 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| 213 | ext4_fsblk_t start_blk; |
| 214 | ext4_fsblk_t last_blk; |
| 215 | ext4_group_t src_group; |
| 216 | ext4_group_t bb_index = 0; |
| 217 | ext4_group_t ib_index = 0; |
| 218 | ext4_group_t it_index = 0; |
| 219 | ext4_group_t group; |
| 220 | ext4_group_t last_group; |
| 221 | unsigned overhead; |
| 222 | |
| 223 | BUG_ON(flex_gd->count == 0 || group_data == NULL); |
| 224 | |
| 225 | src_group = group_data[0].group; |
| 226 | last_group = src_group + flex_gd->count - 1; |
| 227 | |
| 228 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != |
| 229 | (last_group & ~(flexbg_size - 1)))); |
| 230 | next_group: |
| 231 | group = group_data[0].group; |
Yongqiang Yang | 03c1c29 | 2012-09-05 01:21:50 -0400 | [diff] [blame] | 232 | if (src_group >= group_data[0].group + flex_gd->count) |
| 233 | return -ENOSPC; |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 234 | start_blk = ext4_group_first_block_no(sb, src_group); |
| 235 | last_blk = start_blk + group_data[src_group - group].blocks_count; |
| 236 | |
| 237 | overhead = ext4_bg_has_super(sb, src_group) ? |
| 238 | (1 + ext4_bg_num_gdb(sb, src_group) + |
| 239 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
| 240 | |
| 241 | start_blk += overhead; |
| 242 | |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 243 | /* We collect contiguous blocks as much as possible. */ |
| 244 | src_group++; |
| 245 | for (; src_group <= last_group; src_group++) |
| 246 | if (!ext4_bg_has_super(sb, src_group)) |
| 247 | last_blk += group_data[src_group - group].blocks_count; |
| 248 | else |
| 249 | break; |
| 250 | |
| 251 | /* Allocate block bitmaps */ |
| 252 | for (; bb_index < flex_gd->count; bb_index++) { |
| 253 | if (start_blk >= last_blk) |
| 254 | goto next_group; |
| 255 | group_data[bb_index].block_bitmap = start_blk++; |
| 256 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); |
| 257 | group -= group_data[0].group; |
| 258 | group_data[group].free_blocks_count--; |
| 259 | if (flexbg_size > 1) |
| 260 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; |
| 261 | } |
| 262 | |
| 263 | /* Allocate inode bitmaps */ |
| 264 | for (; ib_index < flex_gd->count; ib_index++) { |
| 265 | if (start_blk >= last_blk) |
| 266 | goto next_group; |
| 267 | group_data[ib_index].inode_bitmap = start_blk++; |
| 268 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); |
| 269 | group -= group_data[0].group; |
| 270 | group_data[group].free_blocks_count--; |
| 271 | if (flexbg_size > 1) |
| 272 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; |
| 273 | } |
| 274 | |
| 275 | /* Allocate inode tables */ |
| 276 | for (; it_index < flex_gd->count; it_index++) { |
| 277 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) |
| 278 | goto next_group; |
| 279 | group_data[it_index].inode_table = start_blk; |
| 280 | ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); |
| 281 | group -= group_data[0].group; |
| 282 | group_data[group].free_blocks_count -= |
| 283 | EXT4_SB(sb)->s_itb_per_group; |
| 284 | if (flexbg_size > 1) |
| 285 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; |
| 286 | |
| 287 | start_blk += EXT4_SB(sb)->s_itb_per_group; |
| 288 | } |
| 289 | |
| 290 | if (test_opt(sb, DEBUG)) { |
| 291 | int i; |
| 292 | group = group_data[0].group; |
| 293 | |
| 294 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " |
| 295 | "%d groups, flexbg size is %d:\n", flex_gd->count, |
| 296 | flexbg_size); |
| 297 | |
| 298 | for (i = 0; i < flex_gd->count; i++) { |
| 299 | printk(KERN_DEBUG "adding %s group %u: %u " |
| 300 | "blocks (%d free)\n", |
| 301 | ext4_bg_has_super(sb, group + i) ? "normal" : |
| 302 | "no-super", group + i, |
| 303 | group_data[i].blocks_count, |
| 304 | group_data[i].free_blocks_count); |
| 305 | } |
| 306 | } |
Yongqiang Yang | 03c1c29 | 2012-09-05 01:21:50 -0400 | [diff] [blame] | 307 | return 0; |
Yongqiang Yang | 3fbea4b | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 308 | } |
| 309 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 310 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 311 | ext4_fsblk_t blk) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 312 | { |
| 313 | struct buffer_head *bh; |
| 314 | int err; |
| 315 | |
| 316 | bh = sb_getblk(sb, blk); |
| 317 | if (!bh) |
| 318 | return ERR_PTR(-EIO); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 319 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 320 | brelse(bh); |
| 321 | bh = ERR_PTR(err); |
| 322 | } else { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 323 | memset(bh->b_data, 0, sb->s_blocksize); |
| 324 | set_buffer_uptodate(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | return bh; |
| 328 | } |
| 329 | |
| 330 | /* |
Eric Sandeen | 1490410 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 331 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. |
| 332 | * If that fails, restart the transaction & regain write access for the |
| 333 | * buffer head which is used for block_bitmap modifications. |
| 334 | */ |
Yongqiang Yang | 6d40bc5 | 2011-07-26 22:24:41 -0400 | [diff] [blame] | 335 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
Eric Sandeen | 1490410 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 336 | { |
| 337 | int err; |
| 338 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 339 | if (ext4_handle_has_enough_credits(handle, thresh)) |
Eric Sandeen | 1490410 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 340 | return 0; |
| 341 | |
| 342 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); |
| 343 | if (err < 0) |
| 344 | return err; |
| 345 | if (err) { |
Yongqiang Yang | 6d40bc5 | 2011-07-26 22:24:41 -0400 | [diff] [blame] | 346 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
| 347 | if (err) |
Eric Sandeen | 1490410 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 348 | return err; |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 349 | } |
Eric Sandeen | 1490410 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | /* |
Yongqiang Yang | 33afdcc | 2012-01-03 23:32:52 -0500 | [diff] [blame] | 355 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. |
| 356 | * |
| 357 | * Helper function for ext4_setup_new_group_blocks() which set . |
| 358 | * |
| 359 | * @sb: super block |
| 360 | * @handle: journal handle |
| 361 | * @flex_gd: flex group data |
| 362 | */ |
| 363 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, |
| 364 | struct ext4_new_flex_group_data *flex_gd, |
| 365 | ext4_fsblk_t block, ext4_group_t count) |
| 366 | { |
| 367 | ext4_group_t count2; |
| 368 | |
| 369 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); |
| 370 | for (count2 = count; count > 0; count -= count2, block += count2) { |
| 371 | ext4_fsblk_t start; |
| 372 | struct buffer_head *bh; |
| 373 | ext4_group_t group; |
| 374 | int err; |
| 375 | |
| 376 | ext4_get_group_no_and_offset(sb, block, &group, NULL); |
| 377 | start = ext4_group_first_block_no(sb, group); |
| 378 | group -= flex_gd->groups[0].group; |
| 379 | |
| 380 | count2 = sb->s_blocksize * 8 - (block - start); |
| 381 | if (count2 > count) |
| 382 | count2 = count; |
| 383 | |
| 384 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { |
| 385 | BUG_ON(flex_gd->count > 1); |
| 386 | continue; |
| 387 | } |
| 388 | |
| 389 | err = extend_or_restart_transaction(handle, 1); |
| 390 | if (err) |
| 391 | return err; |
| 392 | |
| 393 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); |
| 394 | if (!bh) |
| 395 | return -EIO; |
| 396 | |
| 397 | err = ext4_journal_get_write_access(handle, bh); |
| 398 | if (err) |
| 399 | return err; |
| 400 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, |
| 401 | block - start, count2); |
| 402 | ext4_set_bits(bh->b_data, block - start, count2); |
| 403 | |
| 404 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| 405 | if (unlikely(err)) |
| 406 | return err; |
| 407 | brelse(bh); |
| 408 | } |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Set up the block and inode bitmaps, and the inode table for the new groups. |
| 415 | * This doesn't need to be part of the main transaction, since we are only |
| 416 | * changing blocks outside the actual filesystem. We still do journaling to |
| 417 | * ensure the recovery is correct in case of a failure just after resize. |
| 418 | * If any part of this fails, we simply abort the resize. |
| 419 | * |
| 420 | * setup_new_flex_group_blocks handles a flex group as follow: |
| 421 | * 1. copy super block and GDT, and initialize group tables if necessary. |
| 422 | * In this step, we only set bits in blocks bitmaps for blocks taken by |
| 423 | * super block and GDT. |
| 424 | * 2. allocate group tables in block bitmaps, that is, set bits in block |
| 425 | * bitmap for blocks taken by group tables. |
| 426 | */ |
| 427 | static int setup_new_flex_group_blocks(struct super_block *sb, |
| 428 | struct ext4_new_flex_group_data *flex_gd) |
| 429 | { |
| 430 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; |
| 431 | ext4_fsblk_t start; |
| 432 | ext4_fsblk_t block; |
| 433 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 434 | struct ext4_super_block *es = sbi->s_es; |
| 435 | struct ext4_new_group_data *group_data = flex_gd->groups; |
| 436 | __u16 *bg_flags = flex_gd->bg_flags; |
| 437 | handle_t *handle; |
| 438 | ext4_group_t group, count; |
| 439 | struct buffer_head *bh = NULL; |
| 440 | int reserved_gdb, i, j, err = 0, err2; |
| 441 | |
| 442 | BUG_ON(!flex_gd->count || !group_data || |
| 443 | group_data[0].group != sbi->s_groups_count); |
| 444 | |
| 445 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); |
| 446 | |
| 447 | /* This transaction may be extended/restarted along the way */ |
| 448 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
| 449 | if (IS_ERR(handle)) |
| 450 | return PTR_ERR(handle); |
| 451 | |
| 452 | group = group_data[0].group; |
| 453 | for (i = 0; i < flex_gd->count; i++, group++) { |
| 454 | unsigned long gdblocks; |
| 455 | |
| 456 | gdblocks = ext4_bg_num_gdb(sb, group); |
| 457 | start = ext4_group_first_block_no(sb, group); |
| 458 | |
| 459 | /* Copy all of the GDT blocks into the backup in this group */ |
| 460 | for (j = 0, block = start + 1; j < gdblocks; j++, block++) { |
| 461 | struct buffer_head *gdb; |
| 462 | |
| 463 | ext4_debug("update backup group %#04llx\n", block); |
| 464 | err = extend_or_restart_transaction(handle, 1); |
| 465 | if (err) |
| 466 | goto out; |
| 467 | |
| 468 | gdb = sb_getblk(sb, block); |
| 469 | if (!gdb) { |
| 470 | err = -EIO; |
| 471 | goto out; |
| 472 | } |
| 473 | |
| 474 | err = ext4_journal_get_write_access(handle, gdb); |
| 475 | if (err) { |
| 476 | brelse(gdb); |
| 477 | goto out; |
| 478 | } |
| 479 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, |
| 480 | gdb->b_size); |
| 481 | set_buffer_uptodate(gdb); |
| 482 | |
| 483 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); |
| 484 | if (unlikely(err)) { |
| 485 | brelse(gdb); |
| 486 | goto out; |
| 487 | } |
| 488 | brelse(gdb); |
| 489 | } |
| 490 | |
| 491 | /* Zero out all of the reserved backup group descriptor |
| 492 | * table blocks |
| 493 | */ |
| 494 | if (ext4_bg_has_super(sb, group)) { |
| 495 | err = sb_issue_zeroout(sb, gdblocks + start + 1, |
| 496 | reserved_gdb, GFP_NOFS); |
| 497 | if (err) |
| 498 | goto out; |
| 499 | } |
| 500 | |
| 501 | /* Initialize group tables of the grop @group */ |
| 502 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) |
| 503 | goto handle_bb; |
| 504 | |
| 505 | /* Zero out all of the inode table blocks */ |
| 506 | block = group_data[i].inode_table; |
| 507 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
| 508 | block, sbi->s_itb_per_group); |
| 509 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, |
| 510 | GFP_NOFS); |
| 511 | if (err) |
| 512 | goto out; |
| 513 | |
| 514 | handle_bb: |
| 515 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) |
| 516 | goto handle_ib; |
| 517 | |
| 518 | /* Initialize block bitmap of the @group */ |
| 519 | block = group_data[i].block_bitmap; |
| 520 | err = extend_or_restart_transaction(handle, 1); |
| 521 | if (err) |
| 522 | goto out; |
| 523 | |
| 524 | bh = bclean(handle, sb, block); |
| 525 | if (IS_ERR(bh)) { |
| 526 | err = PTR_ERR(bh); |
| 527 | goto out; |
| 528 | } |
| 529 | if (ext4_bg_has_super(sb, group)) { |
| 530 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
| 531 | start); |
| 532 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + |
| 533 | 1); |
| 534 | } |
| 535 | ext4_mark_bitmap_end(group_data[i].blocks_count, |
| 536 | sb->s_blocksize * 8, bh->b_data); |
| 537 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| 538 | if (err) |
| 539 | goto out; |
| 540 | brelse(bh); |
| 541 | |
| 542 | handle_ib: |
| 543 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) |
| 544 | continue; |
| 545 | |
| 546 | /* Initialize inode bitmap of the @group */ |
| 547 | block = group_data[i].inode_bitmap; |
| 548 | err = extend_or_restart_transaction(handle, 1); |
| 549 | if (err) |
| 550 | goto out; |
| 551 | /* Mark unused entries in inode bitmap used */ |
| 552 | bh = bclean(handle, sb, block); |
| 553 | if (IS_ERR(bh)) { |
| 554 | err = PTR_ERR(bh); |
| 555 | goto out; |
| 556 | } |
| 557 | |
| 558 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), |
| 559 | sb->s_blocksize * 8, bh->b_data); |
| 560 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| 561 | if (err) |
| 562 | goto out; |
| 563 | brelse(bh); |
| 564 | } |
| 565 | bh = NULL; |
| 566 | |
| 567 | /* Mark group tables in block bitmap */ |
| 568 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { |
| 569 | count = group_table_count[j]; |
| 570 | start = (&group_data[0].block_bitmap)[j]; |
| 571 | block = start; |
| 572 | for (i = 1; i < flex_gd->count; i++) { |
| 573 | block += group_table_count[j]; |
| 574 | if (block == (&group_data[i].block_bitmap)[j]) { |
| 575 | count += group_table_count[j]; |
| 576 | continue; |
| 577 | } |
| 578 | err = set_flexbg_block_bitmap(sb, handle, |
| 579 | flex_gd, start, count); |
| 580 | if (err) |
| 581 | goto out; |
| 582 | count = group_table_count[j]; |
| 583 | start = group_data[i].block_bitmap; |
| 584 | block = start; |
| 585 | } |
| 586 | |
| 587 | if (count) { |
| 588 | err = set_flexbg_block_bitmap(sb, handle, |
| 589 | flex_gd, start, count); |
| 590 | if (err) |
| 591 | goto out; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | out: |
| 596 | brelse(bh); |
| 597 | err2 = ext4_journal_stop(handle); |
| 598 | if (err2 && !err) |
| 599 | err = err2; |
| 600 | |
| 601 | return err; |
| 602 | } |
| 603 | |
| 604 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 605 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 606 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 607 | * calling this for the first time. In a sparse filesystem it will be the |
| 608 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... |
| 609 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... |
| 610 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 611 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 612 | unsigned *five, unsigned *seven) |
| 613 | { |
| 614 | unsigned *min = three; |
| 615 | int mult = 3; |
| 616 | unsigned ret; |
| 617 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 618 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 619 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 620 | ret = *min; |
| 621 | *min += 1; |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | if (*five < *min) { |
| 626 | min = five; |
| 627 | mult = 5; |
| 628 | } |
| 629 | if (*seven < *min) { |
| 630 | min = seven; |
| 631 | mult = 7; |
| 632 | } |
| 633 | |
| 634 | ret = *min; |
| 635 | *min *= mult; |
| 636 | |
| 637 | return ret; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Check that all of the backup GDT blocks are held in the primary GDT block. |
| 642 | * It is assumed that they are stored in group order. Returns the number of |
| 643 | * groups in current filesystem that have BACKUPS, or -ve error code. |
| 644 | */ |
| 645 | static int verify_reserved_gdb(struct super_block *sb, |
Yongqiang Yang | c72df9f | 2012-01-03 23:43:39 -0500 | [diff] [blame] | 646 | ext4_group_t end, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 647 | struct buffer_head *primary) |
| 648 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 649 | const ext4_fsblk_t blk = primary->b_blocknr; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 650 | unsigned three = 1; |
| 651 | unsigned five = 5; |
| 652 | unsigned seven = 7; |
| 653 | unsigned grp; |
| 654 | __le32 *p = (__le32 *)primary->b_data; |
| 655 | int gdbackups = 0; |
| 656 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 657 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 658 | if (le32_to_cpu(*p++) != |
| 659 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 660 | ext4_warning(sb, "reserved GDT %llu" |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 661 | " missing grp %d (%llu)", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 662 | blk, grp, |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 663 | grp * |
| 664 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
| 665 | blk); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 666 | return -EINVAL; |
| 667 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 668 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 669 | return -EFBIG; |
| 670 | } |
| 671 | |
| 672 | return gdbackups; |
| 673 | } |
| 674 | |
| 675 | /* |
| 676 | * Called when we need to bring a reserved group descriptor table block into |
| 677 | * use from the resize inode. The primary copy of the new GDT block currently |
| 678 | * is an indirect block (under the double indirect block in the resize inode). |
| 679 | * The new backup GDT blocks will be stored as leaf blocks in this indirect |
| 680 | * block, in group order. Even though we know all the block numbers we need, |
| 681 | * we check to ensure that the resize inode has actually reserved these blocks. |
| 682 | * |
| 683 | * Don't need to update the block bitmaps because the blocks are still in use. |
| 684 | * |
| 685 | * We get all of the error cases out of the way, so that we are sure to not |
| 686 | * fail once we start modifying the data on disk, because JBD has no rollback. |
| 687 | */ |
| 688 | static int add_new_gdb(handle_t *handle, struct inode *inode, |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 689 | ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 690 | { |
| 691 | struct super_block *sb = inode->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 692 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 693 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 694 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 695 | struct buffer_head **o_group_desc, **n_group_desc; |
| 696 | struct buffer_head *dind; |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 697 | struct buffer_head *gdb_bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 698 | int gdbackups; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 699 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 700 | __le32 *data; |
| 701 | int err; |
| 702 | |
| 703 | if (test_opt(sb, DEBUG)) |
| 704 | printk(KERN_DEBUG |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 705 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 706 | gdb_num); |
| 707 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 708 | /* |
| 709 | * If we are not using the primary superblock/GDT copy don't resize, |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 710 | * because the user tools have no way of handling this. Probably a |
| 711 | * bad time to do it anyways. |
| 712 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 713 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
| 714 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 715 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 716 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 717 | return -EPERM; |
| 718 | } |
| 719 | |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 720 | gdb_bh = sb_bread(sb, gdblock); |
| 721 | if (!gdb_bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 722 | return -EIO; |
| 723 | |
Yongqiang Yang | c72df9f | 2012-01-03 23:43:39 -0500 | [diff] [blame] | 724 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 725 | if (gdbackups < 0) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 726 | err = gdbackups; |
| 727 | goto exit_bh; |
| 728 | } |
| 729 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 730 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 731 | dind = sb_bread(sb, le32_to_cpu(*data)); |
| 732 | if (!dind) { |
| 733 | err = -EIO; |
| 734 | goto exit_bh; |
| 735 | } |
| 736 | |
| 737 | data = (__le32 *)dind->b_data; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 738 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 739 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 740 | group, gdblock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 741 | err = -EINVAL; |
| 742 | goto exit_dind; |
| 743 | } |
| 744 | |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 745 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
| 746 | if (unlikely(err)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 747 | goto exit_dind; |
| 748 | |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 749 | err = ext4_journal_get_write_access(handle, gdb_bh); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 750 | if (unlikely(err)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 751 | goto exit_sbh; |
| 752 | |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 753 | err = ext4_journal_get_write_access(handle, dind); |
| 754 | if (unlikely(err)) |
| 755 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 756 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 757 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 758 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
| 759 | if (unlikely(err)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 760 | goto exit_dindj; |
| 761 | |
Theodore Ts'o | f18a5f2 | 2011-08-01 08:45:38 -0400 | [diff] [blame] | 762 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
| 763 | sizeof(struct buffer_head *), |
| 764 | GFP_NOFS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 765 | if (!n_group_desc) { |
| 766 | err = -ENOMEM; |
Theodore Ts'o | f18a5f2 | 2011-08-01 08:45:38 -0400 | [diff] [blame] | 767 | ext4_warning(sb, "not enough memory for %lu groups", |
| 768 | gdb_num + 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 769 | goto exit_inode; |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * Finally, we have all of the possible failures behind us... |
| 774 | * |
| 775 | * Remove new GDT block from inode double-indirect block and clear out |
| 776 | * the new GDT block for use (which also "frees" the backup GDT blocks |
| 777 | * from the reserved inode). We don't need to change the bitmaps for |
| 778 | * these blocks, because they are marked as in-use from being in the |
| 779 | * reserved inode, and will become GDT blocks (primary and backup). |
| 780 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 781 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 782 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
| 783 | if (unlikely(err)) { |
| 784 | ext4_std_error(sb, err); |
| 785 | goto exit_inode; |
| 786 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 787 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 788 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 789 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
| 790 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 791 | if (unlikely(err)) { |
| 792 | ext4_std_error(sb, err); |
| 793 | goto exit_inode; |
| 794 | } |
| 795 | brelse(dind); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 796 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 797 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 798 | memcpy(n_group_desc, o_group_desc, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 799 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 800 | n_group_desc[gdb_num] = gdb_bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 801 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
| 802 | EXT4_SB(sb)->s_gdb_count++; |
Theodore Ts'o | f18a5f2 | 2011-08-01 08:45:38 -0400 | [diff] [blame] | 803 | ext4_kvfree(o_group_desc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 804 | |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 805 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
Artem Bityutskiy | b50924c | 2012-07-22 20:37:31 -0400 | [diff] [blame] | 806 | err = ext4_handle_dirty_super(handle, sb); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 807 | if (err) |
| 808 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 809 | |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 810 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 811 | |
| 812 | exit_inode: |
Theodore Ts'o | f18a5f2 | 2011-08-01 08:45:38 -0400 | [diff] [blame] | 813 | ext4_kvfree(n_group_desc); |
Amir Goldstein | 537a031 | 2011-03-20 22:57:02 -0400 | [diff] [blame] | 814 | /* ext4_handle_release_buffer(handle, iloc.bh); */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 815 | brelse(iloc.bh); |
| 816 | exit_dindj: |
Amir Goldstein | 537a031 | 2011-03-20 22:57:02 -0400 | [diff] [blame] | 817 | /* ext4_handle_release_buffer(handle, dind); */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 818 | exit_sbh: |
Amir Goldstein | 537a031 | 2011-03-20 22:57:02 -0400 | [diff] [blame] | 819 | /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 820 | exit_dind: |
| 821 | brelse(dind); |
| 822 | exit_bh: |
Yongqiang Yang | 2f91971 | 2011-07-27 21:16:33 -0400 | [diff] [blame] | 823 | brelse(gdb_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 824 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 825 | ext4_debug("leaving with error %d\n", err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 826 | return err; |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Called when we are adding a new group which has a backup copy of each of |
| 831 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. |
| 832 | * We need to add these reserved backup GDT blocks to the resize inode, so |
| 833 | * that they are kept for future resizing and not allocated to files. |
| 834 | * |
| 835 | * Each reserved backup GDT block will go into a different indirect block. |
| 836 | * The indirect blocks are actually the primary reserved GDT blocks, |
| 837 | * so we know in advance what their block numbers are. We only get the |
| 838 | * double-indirect block to verify it is pointing to the primary reserved |
| 839 | * GDT blocks so we don't overwrite a data block by accident. The reserved |
| 840 | * backup GDT blocks are stored in their reserved primary GDT block. |
| 841 | */ |
| 842 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, |
Yongqiang Yang | 668f4dc | 2011-07-27 21:23:13 -0400 | [diff] [blame] | 843 | ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 844 | { |
| 845 | struct super_block *sb = inode->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 846 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 847 | struct buffer_head **primary; |
| 848 | struct buffer_head *dind; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 849 | struct ext4_iloc iloc; |
| 850 | ext4_fsblk_t blk; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 851 | __le32 *data, *end; |
| 852 | int gdbackups = 0; |
| 853 | int res, i; |
| 854 | int err; |
| 855 | |
Josef Bacik | 216553c | 2008-04-29 22:02:02 -0400 | [diff] [blame] | 856 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 857 | if (!primary) |
| 858 | return -ENOMEM; |
| 859 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 860 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 861 | dind = sb_bread(sb, le32_to_cpu(*data)); |
| 862 | if (!dind) { |
| 863 | err = -EIO; |
| 864 | goto exit_free; |
| 865 | } |
| 866 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 867 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
Josef Bacik | 9446009 | 2008-06-06 18:05:52 -0400 | [diff] [blame] | 868 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
| 869 | EXT4_ADDR_PER_BLOCK(sb)); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 870 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 871 | |
| 872 | /* Get each reserved primary GDT block and verify it holds backups */ |
| 873 | for (res = 0; res < reserved_gdb; res++, blk++) { |
| 874 | if (le32_to_cpu(*data) != blk) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 875 | ext4_warning(sb, "reserved block %llu" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 876 | " not at offset %ld", |
| 877 | blk, |
| 878 | (long)(data - (__le32 *)dind->b_data)); |
| 879 | err = -EINVAL; |
| 880 | goto exit_bh; |
| 881 | } |
| 882 | primary[res] = sb_bread(sb, blk); |
| 883 | if (!primary[res]) { |
| 884 | err = -EIO; |
| 885 | goto exit_bh; |
| 886 | } |
Yongqiang Yang | c72df9f | 2012-01-03 23:43:39 -0500 | [diff] [blame] | 887 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
| 888 | if (gdbackups < 0) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 889 | brelse(primary[res]); |
| 890 | err = gdbackups; |
| 891 | goto exit_bh; |
| 892 | } |
| 893 | if (++data >= end) |
| 894 | data = (__le32 *)dind->b_data; |
| 895 | } |
| 896 | |
| 897 | for (i = 0; i < reserved_gdb; i++) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 898 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 899 | /* |
| 900 | int j; |
| 901 | for (j = 0; j < i; j++) |
Amir Goldstein | 537a031 | 2011-03-20 22:57:02 -0400 | [diff] [blame] | 902 | ext4_handle_release_buffer(handle, primary[j]); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 903 | */ |
| 904 | goto exit_bh; |
| 905 | } |
| 906 | } |
| 907 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 908 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 909 | goto exit_bh; |
| 910 | |
| 911 | /* |
| 912 | * Finally we can add each of the reserved backup GDT blocks from |
| 913 | * the new group to its reserved primary GDT block. |
| 914 | */ |
Yongqiang Yang | 668f4dc | 2011-07-27 21:23:13 -0400 | [diff] [blame] | 915 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 916 | for (i = 0; i < reserved_gdb; i++) { |
| 917 | int err2; |
| 918 | data = (__le32 *)primary[i]->b_data; |
| 919 | /* printk("reserving backup %lu[%u] = %lu\n", |
| 920 | primary[i]->b_blocknr, gdbackups, |
| 921 | blk + primary[i]->b_blocknr); */ |
| 922 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 923 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 924 | if (!err) |
| 925 | err = err2; |
| 926 | } |
| 927 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 928 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 929 | |
| 930 | exit_bh: |
| 931 | while (--res >= 0) |
| 932 | brelse(primary[res]); |
| 933 | brelse(dind); |
| 934 | |
| 935 | exit_free: |
| 936 | kfree(primary); |
| 937 | |
| 938 | return err; |
| 939 | } |
| 940 | |
| 941 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 942 | * Update the backup copies of the ext4 metadata. These don't need to be part |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 943 | * of the main resize transaction, because e2fsck will re-write them if there |
| 944 | * is a problem (basically only OOM will cause a problem). However, we |
| 945 | * _should_ update the backups if possible, in case the primary gets trashed |
| 946 | * for some reason and we need to run e2fsck from a backup superblock. The |
| 947 | * important part is that the new block and inode counts are in the backup |
| 948 | * superblocks, and the location of the new group metadata in the GDT backups. |
| 949 | * |
Theodore Ts'o | 32ed505 | 2009-04-25 22:53:39 -0400 | [diff] [blame] | 950 | * We do not need take the s_resize_lock for this, because these |
| 951 | * blocks are not otherwise touched by the filesystem code when it is |
| 952 | * mounted. We don't need to worry about last changing from |
| 953 | * sbi->s_groups_count, because the worst that can happen is that we |
| 954 | * do not copy the full number of backups at this time. The resize |
| 955 | * which changed s_groups_count will backup again. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 956 | */ |
| 957 | static void update_backups(struct super_block *sb, |
| 958 | int blk_off, char *data, int size) |
| 959 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 960 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 961 | const ext4_group_t last = sbi->s_groups_count; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 962 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 963 | unsigned three = 1; |
| 964 | unsigned five = 5; |
| 965 | unsigned seven = 7; |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 966 | ext4_group_t group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 967 | int rest = sb->s_blocksize - size; |
| 968 | handle_t *handle; |
| 969 | int err = 0, err2; |
| 970 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 971 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 972 | if (IS_ERR(handle)) { |
| 973 | group = 1; |
| 974 | err = PTR_ERR(handle); |
| 975 | goto exit_err; |
| 976 | } |
| 977 | |
Darrick J. Wong | a9c47317 | 2012-04-29 18:29:10 -0400 | [diff] [blame] | 978 | ext4_superblock_csum_set(sb, (struct ext4_super_block *)data); |
| 979 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 980 | while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 981 | struct buffer_head *bh; |
| 982 | |
| 983 | /* Out of journal space, and can't get more - abort - so sad */ |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 984 | if (ext4_handle_valid(handle) && |
| 985 | handle->h_buffer_credits == 0 && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 986 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
| 987 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 988 | break; |
| 989 | |
| 990 | bh = sb_getblk(sb, group * bpg + blk_off); |
| 991 | if (!bh) { |
| 992 | err = -EIO; |
| 993 | break; |
| 994 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 995 | ext4_debug("update metadata backup %#04lx\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 996 | (unsigned long)bh->b_blocknr); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 997 | if ((err = ext4_journal_get_write_access(handle, bh))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 998 | break; |
| 999 | lock_buffer(bh); |
| 1000 | memcpy(bh->b_data, data, size); |
| 1001 | if (rest) |
| 1002 | memset(bh->b_data + size, 0, rest); |
| 1003 | set_buffer_uptodate(bh); |
| 1004 | unlock_buffer(bh); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 1005 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| 1006 | if (unlikely(err)) |
| 1007 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1008 | brelse(bh); |
| 1009 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1010 | if ((err2 = ext4_journal_stop(handle)) && !err) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1011 | err = err2; |
| 1012 | |
| 1013 | /* |
| 1014 | * Ugh! Need to have e2fsck write the backup copies. It is too |
| 1015 | * late to revert the resize, we shouldn't fail just because of |
| 1016 | * the backup copies (they are only needed in case of corruption). |
| 1017 | * |
| 1018 | * However, if we got here we have a journal problem too, so we |
| 1019 | * can't really start a transaction to mark the superblock. |
| 1020 | * Chicken out and just set the flag on the hope it will be written |
| 1021 | * to disk, and if not - we will simply wait until next fsck. |
| 1022 | */ |
| 1023 | exit_err: |
| 1024 | if (err) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1025 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1026 | "forcing fsck on next reboot", group, err); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1027 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
| 1028 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1029 | mark_buffer_dirty(sbi->s_sbh); |
| 1030 | } |
| 1031 | } |
| 1032 | |
Yongqiang Yang | bb08c1e | 2012-01-03 23:20:50 -0500 | [diff] [blame] | 1033 | /* |
| 1034 | * ext4_add_new_descs() adds @count group descriptor of groups |
| 1035 | * starting at @group |
| 1036 | * |
| 1037 | * @handle: journal handle |
| 1038 | * @sb: super block |
| 1039 | * @group: the group no. of the first group desc to be added |
| 1040 | * @resize_inode: the resize inode |
| 1041 | * @count: number of group descriptors to be added |
| 1042 | */ |
| 1043 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, |
| 1044 | ext4_group_t group, struct inode *resize_inode, |
| 1045 | ext4_group_t count) |
| 1046 | { |
| 1047 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1048 | struct ext4_super_block *es = sbi->s_es; |
| 1049 | struct buffer_head *gdb_bh; |
| 1050 | int i, gdb_off, gdb_num, err = 0; |
| 1051 | |
| 1052 | for (i = 0; i < count; i++, group++) { |
| 1053 | int reserved_gdb = ext4_bg_has_super(sb, group) ? |
| 1054 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
| 1055 | |
| 1056 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); |
| 1057 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| 1058 | |
| 1059 | /* |
| 1060 | * We will only either add reserved group blocks to a backup group |
| 1061 | * or remove reserved blocks for the first group in a new group block. |
| 1062 | * Doing both would be mean more complex code, and sane people don't |
| 1063 | * use non-sparse filesystems anymore. This is already checked above. |
| 1064 | */ |
| 1065 | if (gdb_off) { |
| 1066 | gdb_bh = sbi->s_group_desc[gdb_num]; |
| 1067 | err = ext4_journal_get_write_access(handle, gdb_bh); |
| 1068 | |
| 1069 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) |
| 1070 | err = reserve_backup_gdb(handle, resize_inode, group); |
| 1071 | } else |
| 1072 | err = add_new_gdb(handle, resize_inode, group); |
| 1073 | if (err) |
| 1074 | break; |
| 1075 | } |
| 1076 | return err; |
| 1077 | } |
| 1078 | |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 1079 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
| 1080 | { |
| 1081 | struct buffer_head *bh = sb_getblk(sb, block); |
| 1082 | if (!bh) |
| 1083 | return NULL; |
| 1084 | |
| 1085 | if (bitmap_uptodate(bh)) |
| 1086 | return bh; |
| 1087 | |
| 1088 | lock_buffer(bh); |
| 1089 | if (bh_submit_read(bh) < 0) { |
| 1090 | unlock_buffer(bh); |
| 1091 | brelse(bh); |
| 1092 | return NULL; |
| 1093 | } |
| 1094 | unlock_buffer(bh); |
| 1095 | |
| 1096 | return bh; |
| 1097 | } |
| 1098 | |
| 1099 | static int ext4_set_bitmap_checksums(struct super_block *sb, |
| 1100 | ext4_group_t group, |
| 1101 | struct ext4_group_desc *gdp, |
| 1102 | struct ext4_new_group_data *group_data) |
| 1103 | { |
| 1104 | struct buffer_head *bh; |
| 1105 | |
| 1106 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 1107 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 1108 | return 0; |
| 1109 | |
| 1110 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); |
| 1111 | if (!bh) |
| 1112 | return -EIO; |
| 1113 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, |
| 1114 | EXT4_INODES_PER_GROUP(sb) / 8); |
| 1115 | brelse(bh); |
| 1116 | |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 1117 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
| 1118 | if (!bh) |
| 1119 | return -EIO; |
| 1120 | ext4_block_bitmap_csum_set(sb, group, gdp, bh, |
| 1121 | EXT4_BLOCKS_PER_GROUP(sb) / 8); |
| 1122 | brelse(bh); |
| 1123 | |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 1124 | return 0; |
| 1125 | } |
| 1126 | |
Yongqiang Yang | 083f5b2 | 2012-01-03 23:37:31 -0500 | [diff] [blame] | 1127 | /* |
| 1128 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg |
| 1129 | */ |
| 1130 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, |
| 1131 | struct ext4_new_flex_group_data *flex_gd) |
| 1132 | { |
| 1133 | struct ext4_new_group_data *group_data = flex_gd->groups; |
| 1134 | struct ext4_group_desc *gdp; |
| 1135 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1136 | struct buffer_head *gdb_bh; |
| 1137 | ext4_group_t group; |
| 1138 | __u16 *bg_flags = flex_gd->bg_flags; |
| 1139 | int i, gdb_off, gdb_num, err = 0; |
| 1140 | |
| 1141 | |
| 1142 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { |
| 1143 | group = group_data->group; |
| 1144 | |
| 1145 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); |
| 1146 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
| 1147 | |
| 1148 | /* |
| 1149 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). |
| 1150 | */ |
| 1151 | gdb_bh = sbi->s_group_desc[gdb_num]; |
| 1152 | /* Update group descriptor block for new group */ |
Theodore Ts'o | 2716b80 | 2012-05-28 17:47:52 -0400 | [diff] [blame] | 1153 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
Yongqiang Yang | 083f5b2 | 2012-01-03 23:37:31 -0500 | [diff] [blame] | 1154 | gdb_off * EXT4_DESC_SIZE(sb)); |
| 1155 | |
| 1156 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); |
| 1157 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); |
| 1158 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 1159 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
| 1160 | if (err) { |
| 1161 | ext4_std_error(sb, err); |
| 1162 | break; |
| 1163 | } |
| 1164 | |
Yongqiang Yang | 083f5b2 | 2012-01-03 23:37:31 -0500 | [diff] [blame] | 1165 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
| 1166 | ext4_free_group_clusters_set(sb, gdp, |
| 1167 | EXT4_B2C(sbi, group_data->free_blocks_count)); |
| 1168 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
| 1169 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 1170 | ext4_group_desc_csum_set(sb, group, gdp); |
Yongqiang Yang | 083f5b2 | 2012-01-03 23:37:31 -0500 | [diff] [blame] | 1171 | |
| 1172 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); |
| 1173 | if (unlikely(err)) { |
| 1174 | ext4_std_error(sb, err); |
| 1175 | break; |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * We can allocate memory for mb_alloc based on the new group |
| 1180 | * descriptor |
| 1181 | */ |
| 1182 | err = ext4_mb_add_groupinfo(sb, group, gdp); |
| 1183 | if (err) |
| 1184 | break; |
| 1185 | } |
| 1186 | return err; |
| 1187 | } |
| 1188 | |
Yongqiang Yang | 2e10e2f | 2012-01-03 23:41:39 -0500 | [diff] [blame] | 1189 | /* |
| 1190 | * ext4_update_super() updates the super block so that the newly added |
| 1191 | * groups can be seen by the filesystem. |
| 1192 | * |
| 1193 | * @sb: super block |
| 1194 | * @flex_gd: new added groups |
| 1195 | */ |
| 1196 | static void ext4_update_super(struct super_block *sb, |
| 1197 | struct ext4_new_flex_group_data *flex_gd) |
| 1198 | { |
| 1199 | ext4_fsblk_t blocks_count = 0; |
| 1200 | ext4_fsblk_t free_blocks = 0; |
| 1201 | ext4_fsblk_t reserved_blocks = 0; |
| 1202 | struct ext4_new_group_data *group_data = flex_gd->groups; |
| 1203 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1204 | struct ext4_super_block *es = sbi->s_es; |
Theodore Ts'o | 8a99184 | 2012-07-22 20:23:31 -0400 | [diff] [blame] | 1205 | int i; |
Yongqiang Yang | 2e10e2f | 2012-01-03 23:41:39 -0500 | [diff] [blame] | 1206 | |
| 1207 | BUG_ON(flex_gd->count == 0 || group_data == NULL); |
| 1208 | /* |
| 1209 | * Make the new blocks and inodes valid next. We do this before |
| 1210 | * increasing the group count so that once the group is enabled, |
| 1211 | * all of its blocks and inodes are already valid. |
| 1212 | * |
| 1213 | * We always allocate group-by-group, then block-by-block or |
| 1214 | * inode-by-inode within a group, so enabling these |
| 1215 | * blocks/inodes before the group is live won't actually let us |
| 1216 | * allocate the new space yet. |
| 1217 | */ |
| 1218 | for (i = 0; i < flex_gd->count; i++) { |
| 1219 | blocks_count += group_data[i].blocks_count; |
| 1220 | free_blocks += group_data[i].free_blocks_count; |
| 1221 | } |
| 1222 | |
| 1223 | reserved_blocks = ext4_r_blocks_count(es) * 100; |
| 1224 | do_div(reserved_blocks, ext4_blocks_count(es)); |
| 1225 | reserved_blocks *= blocks_count; |
| 1226 | do_div(reserved_blocks, 100); |
| 1227 | |
| 1228 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); |
Darrick J. Wong | 636d7e2e | 2012-03-20 15:46:11 -0400 | [diff] [blame] | 1229 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
Yongqiang Yang | 2e10e2f | 2012-01-03 23:41:39 -0500 | [diff] [blame] | 1230 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
| 1231 | flex_gd->count); |
Darrick J. Wong | 636d7e2e | 2012-03-20 15:46:11 -0400 | [diff] [blame] | 1232 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
| 1233 | flex_gd->count); |
Yongqiang Yang | 2e10e2f | 2012-01-03 23:41:39 -0500 | [diff] [blame] | 1234 | |
| 1235 | /* |
| 1236 | * We need to protect s_groups_count against other CPUs seeing |
| 1237 | * inconsistent state in the superblock. |
| 1238 | * |
| 1239 | * The precise rules we use are: |
| 1240 | * |
| 1241 | * * Writers must perform a smp_wmb() after updating all |
| 1242 | * dependent data and before modifying the groups count |
| 1243 | * |
| 1244 | * * Readers must perform an smp_rmb() after reading the groups |
| 1245 | * count and before reading any dependent data. |
| 1246 | * |
| 1247 | * NB. These rules can be relaxed when checking the group count |
| 1248 | * while freeing data, as we can only allocate from a block |
| 1249 | * group after serialising against the group count, and we can |
| 1250 | * only then free after serialising in turn against that |
| 1251 | * allocation. |
| 1252 | */ |
| 1253 | smp_wmb(); |
| 1254 | |
| 1255 | /* Update the global fs size fields */ |
| 1256 | sbi->s_groups_count += flex_gd->count; |
| 1257 | |
| 1258 | /* Update the reserved block counts only once the new group is |
| 1259 | * active. */ |
| 1260 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + |
| 1261 | reserved_blocks); |
| 1262 | |
| 1263 | /* Update the free space counts */ |
| 1264 | percpu_counter_add(&sbi->s_freeclusters_counter, |
| 1265 | EXT4_B2C(sbi, free_blocks)); |
| 1266 | percpu_counter_add(&sbi->s_freeinodes_counter, |
| 1267 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); |
| 1268 | |
| 1269 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, |
| 1270 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && |
| 1271 | sbi->s_log_groups_per_flex) { |
| 1272 | ext4_group_t flex_group; |
| 1273 | flex_group = ext4_flex_group(sbi, group_data[0].group); |
| 1274 | atomic_add(EXT4_B2C(sbi, free_blocks), |
| 1275 | &sbi->s_flex_groups[flex_group].free_clusters); |
| 1276 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
| 1277 | &sbi->s_flex_groups[flex_group].free_inodes); |
| 1278 | } |
| 1279 | |
Theodore Ts'o | 952fc18 | 2012-07-09 16:27:05 -0400 | [diff] [blame] | 1280 | /* |
| 1281 | * Update the fs overhead information |
| 1282 | */ |
| 1283 | ext4_calculate_overhead(sb); |
| 1284 | |
Yongqiang Yang | 2e10e2f | 2012-01-03 23:41:39 -0500 | [diff] [blame] | 1285 | if (test_opt(sb, DEBUG)) |
| 1286 | printk(KERN_DEBUG "EXT4-fs: added group %u:" |
| 1287 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, |
| 1288 | blocks_count, free_blocks, reserved_blocks); |
| 1289 | } |
| 1290 | |
Yongqiang Yang | 4bac1f8 | 2012-01-03 23:44:38 -0500 | [diff] [blame] | 1291 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
| 1292 | * _before_ we start modifying the filesystem, because we cannot abort the |
| 1293 | * transaction and not have it write the data to disk. |
| 1294 | */ |
| 1295 | static int ext4_flex_group_add(struct super_block *sb, |
| 1296 | struct inode *resize_inode, |
| 1297 | struct ext4_new_flex_group_data *flex_gd) |
| 1298 | { |
| 1299 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1300 | struct ext4_super_block *es = sbi->s_es; |
| 1301 | ext4_fsblk_t o_blocks_count; |
| 1302 | ext4_grpblk_t last; |
| 1303 | ext4_group_t group; |
| 1304 | handle_t *handle; |
| 1305 | unsigned reserved_gdb; |
| 1306 | int err = 0, err2 = 0, credit; |
| 1307 | |
| 1308 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); |
| 1309 | |
| 1310 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); |
| 1311 | o_blocks_count = ext4_blocks_count(es); |
| 1312 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
| 1313 | BUG_ON(last); |
| 1314 | |
| 1315 | err = setup_new_flex_group_blocks(sb, flex_gd); |
| 1316 | if (err) |
| 1317 | goto exit; |
| 1318 | /* |
| 1319 | * We will always be modifying at least the superblock and GDT |
| 1320 | * block. If we are adding a group past the last current GDT block, |
| 1321 | * we will also modify the inode and the dindirect block. If we |
| 1322 | * are adding a group with superblock/GDT backups we will also |
| 1323 | * modify each of the reserved GDT dindirect blocks. |
| 1324 | */ |
| 1325 | credit = flex_gd->count * 4 + reserved_gdb; |
| 1326 | handle = ext4_journal_start_sb(sb, credit); |
| 1327 | if (IS_ERR(handle)) { |
| 1328 | err = PTR_ERR(handle); |
| 1329 | goto exit; |
| 1330 | } |
| 1331 | |
| 1332 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
| 1333 | if (err) |
| 1334 | goto exit_journal; |
| 1335 | |
| 1336 | group = flex_gd->groups[0].group; |
| 1337 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); |
| 1338 | err = ext4_add_new_descs(handle, sb, group, |
| 1339 | resize_inode, flex_gd->count); |
| 1340 | if (err) |
| 1341 | goto exit_journal; |
| 1342 | |
| 1343 | err = ext4_setup_new_descs(handle, sb, flex_gd); |
| 1344 | if (err) |
| 1345 | goto exit_journal; |
| 1346 | |
| 1347 | ext4_update_super(sb, flex_gd); |
| 1348 | |
| 1349 | err = ext4_handle_dirty_super(handle, sb); |
| 1350 | |
| 1351 | exit_journal: |
| 1352 | err2 = ext4_journal_stop(handle); |
| 1353 | if (!err) |
| 1354 | err = err2; |
| 1355 | |
| 1356 | if (!err) { |
| 1357 | int i; |
| 1358 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
| 1359 | sizeof(struct ext4_super_block)); |
| 1360 | for (i = 0; i < flex_gd->count; i++, group++) { |
| 1361 | struct buffer_head *gdb_bh; |
| 1362 | int gdb_num; |
| 1363 | gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb); |
| 1364 | gdb_bh = sbi->s_group_desc[gdb_num]; |
| 1365 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
| 1366 | gdb_bh->b_size); |
| 1367 | } |
| 1368 | } |
| 1369 | exit: |
| 1370 | return err; |
| 1371 | } |
| 1372 | |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1373 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
| 1374 | struct ext4_new_flex_group_data *flex_gd, |
| 1375 | ext4_fsblk_t n_blocks_count, |
| 1376 | unsigned long flexbg_size) |
| 1377 | { |
| 1378 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| 1379 | struct ext4_new_group_data *group_data = flex_gd->groups; |
| 1380 | ext4_fsblk_t o_blocks_count; |
| 1381 | ext4_group_t n_group; |
| 1382 | ext4_group_t group; |
| 1383 | ext4_group_t last_group; |
| 1384 | ext4_grpblk_t last; |
| 1385 | ext4_grpblk_t blocks_per_group; |
| 1386 | unsigned long i; |
| 1387 | |
| 1388 | blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); |
| 1389 | |
| 1390 | o_blocks_count = ext4_blocks_count(es); |
| 1391 | |
| 1392 | if (o_blocks_count == n_blocks_count) |
| 1393 | return 0; |
| 1394 | |
| 1395 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
| 1396 | BUG_ON(last); |
| 1397 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); |
| 1398 | |
| 1399 | last_group = group | (flexbg_size - 1); |
| 1400 | if (last_group > n_group) |
| 1401 | last_group = n_group; |
| 1402 | |
| 1403 | flex_gd->count = last_group - group + 1; |
| 1404 | |
| 1405 | for (i = 0; i < flex_gd->count; i++) { |
| 1406 | int overhead; |
| 1407 | |
| 1408 | group_data[i].group = group + i; |
| 1409 | group_data[i].blocks_count = blocks_per_group; |
| 1410 | overhead = ext4_bg_has_super(sb, group + i) ? |
| 1411 | (1 + ext4_bg_num_gdb(sb, group + i) + |
| 1412 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
| 1413 | group_data[i].free_blocks_count = blocks_per_group - overhead; |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 1414 | if (ext4_has_group_desc_csum(sb)) |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1415 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
| 1416 | EXT4_BG_INODE_UNINIT; |
| 1417 | else |
| 1418 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
| 1419 | } |
| 1420 | |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 1421 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1422 | /* We need to initialize block bitmap of last group. */ |
| 1423 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; |
| 1424 | |
| 1425 | if ((last_group == n_group) && (last != blocks_per_group - 1)) { |
| 1426 | group_data[i - 1].blocks_count = last + 1; |
| 1427 | group_data[i - 1].free_blocks_count -= blocks_per_group- |
| 1428 | last - 1; |
| 1429 | } |
| 1430 | |
| 1431 | return 1; |
| 1432 | } |
| 1433 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1434 | /* Add group descriptor data to an existing or new group descriptor block. |
| 1435 | * Ensure we handle all possible error conditions _before_ we start modifying |
| 1436 | * the filesystem, because we cannot abort the transaction and not have it |
| 1437 | * write the data to disk. |
| 1438 | * |
| 1439 | * If we are on a GDT block boundary, we need to get the reserved GDT block. |
| 1440 | * Otherwise, we may need to add backup GDT blocks for a sparse group. |
| 1441 | * |
| 1442 | * We only need to hold the superblock lock while we are actually adding |
| 1443 | * in the new group's counts to the superblock. Prior to that we have |
| 1444 | * not really "added" the group at all. We re-check that we are still |
| 1445 | * adding in the last group in case things have changed since verifying. |
| 1446 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1447 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1448 | { |
Yongqiang Yang | 61f296c | 2012-01-04 17:09:50 -0500 | [diff] [blame] | 1449 | struct ext4_new_flex_group_data flex_gd; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1450 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1451 | struct ext4_super_block *es = sbi->s_es; |
| 1452 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1453 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1454 | struct inode *inode = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1455 | int gdb_off, gdb_num; |
Yongqiang Yang | 61f296c | 2012-01-04 17:09:50 -0500 | [diff] [blame] | 1456 | int err; |
| 1457 | __u16 bg_flags = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1458 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1459 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
| 1460 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1461 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1462 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 1463 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1464 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1465 | return -EPERM; |
| 1466 | } |
| 1467 | |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1468 | if (ext4_blocks_count(es) + input->blocks_count < |
| 1469 | ext4_blocks_count(es)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1470 | ext4_warning(sb, "blocks_count overflow"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1471 | return -EINVAL; |
| 1472 | } |
| 1473 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1474 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1475 | le32_to_cpu(es->s_inodes_count)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1476 | ext4_warning(sb, "inodes_count overflow"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1477 | return -EINVAL; |
| 1478 | } |
| 1479 | |
| 1480 | if (reserved_gdb || gdb_off == 0) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1481 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
Josef Bacik | 37609fd | 2008-08-19 22:13:41 -0400 | [diff] [blame] | 1482 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
| 1483 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1484 | ext4_warning(sb, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1485 | "No reserved GDT blocks, can't resize"); |
| 1486 | return -EPERM; |
| 1487 | } |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1488 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
| 1489 | if (IS_ERR(inode)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1490 | ext4_warning(sb, "Error opening resize inode"); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1491 | return PTR_ERR(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1492 | } |
| 1493 | } |
| 1494 | |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 1495 | |
Yongqiang Yang | 61f296c | 2012-01-04 17:09:50 -0500 | [diff] [blame] | 1496 | err = verify_group_input(sb, input); |
Aneesh Kumar K.V | 08c3a81 | 2009-09-09 23:50:17 -0400 | [diff] [blame] | 1497 | if (err) |
Yongqiang Yang | 61f296c | 2012-01-04 17:09:50 -0500 | [diff] [blame] | 1498 | goto out; |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 1499 | |
Yongqiang Yang | 61f296c | 2012-01-04 17:09:50 -0500 | [diff] [blame] | 1500 | flex_gd.count = 1; |
| 1501 | flex_gd.groups = input; |
| 1502 | flex_gd.bg_flags = &bg_flags; |
| 1503 | err = ext4_flex_group_add(sb, inode, &flex_gd); |
| 1504 | out: |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1505 | iput(inode); |
| 1506 | return err; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1507 | } /* ext4_group_add */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1508 | |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1509 | /* |
Yongqiang Yang | 18e3143 | 2012-01-03 23:18:50 -0500 | [diff] [blame] | 1510 | * extend a group without checking assuming that checking has been done. |
| 1511 | */ |
| 1512 | static int ext4_group_extend_no_check(struct super_block *sb, |
| 1513 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) |
| 1514 | { |
| 1515 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| 1516 | handle_t *handle; |
| 1517 | int err = 0, err2; |
| 1518 | |
| 1519 | /* We will update the superblock, one block bitmap, and |
| 1520 | * one group descriptor via ext4_group_add_blocks(). |
| 1521 | */ |
| 1522 | handle = ext4_journal_start_sb(sb, 3); |
| 1523 | if (IS_ERR(handle)) { |
| 1524 | err = PTR_ERR(handle); |
| 1525 | ext4_warning(sb, "error %d on journal start", err); |
| 1526 | return err; |
| 1527 | } |
| 1528 | |
| 1529 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
| 1530 | if (err) { |
| 1531 | ext4_warning(sb, "error %d on journal write access", err); |
| 1532 | goto errout; |
| 1533 | } |
| 1534 | |
| 1535 | ext4_blocks_count_set(es, o_blocks_count + add); |
Darrick J. Wong | 636d7e2e | 2012-03-20 15:46:11 -0400 | [diff] [blame] | 1536 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
Yongqiang Yang | 18e3143 | 2012-01-03 23:18:50 -0500 | [diff] [blame] | 1537 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
| 1538 | o_blocks_count + add); |
| 1539 | /* We add the blocks to the bitmap and set the group need init bit */ |
| 1540 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); |
| 1541 | if (err) |
| 1542 | goto errout; |
| 1543 | ext4_handle_dirty_super(handle, sb); |
| 1544 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, |
| 1545 | o_blocks_count + add); |
| 1546 | errout: |
| 1547 | err2 = ext4_journal_stop(handle); |
| 1548 | if (err2 && !err) |
| 1549 | err = err2; |
| 1550 | |
| 1551 | if (!err) { |
| 1552 | if (test_opt(sb, DEBUG)) |
| 1553 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " |
| 1554 | "blocks\n", ext4_blocks_count(es)); |
| 1555 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, |
| 1556 | sizeof(struct ext4_super_block)); |
| 1557 | } |
| 1558 | return err; |
| 1559 | } |
| 1560 | |
| 1561 | /* |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1562 | * Extend the filesystem to the new number of blocks specified. This entry |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1563 | * point is only used to extend the current filesystem to the end of the last |
| 1564 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" |
| 1565 | * for emergencies (because it has no dependencies on reserved blocks). |
| 1566 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1567 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1568 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
| 1569 | * GDT blocks are reserved to grow to the desired size. |
| 1570 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1571 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
| 1572 | ext4_fsblk_t n_blocks_count) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1573 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1574 | ext4_fsblk_t o_blocks_count; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1575 | ext4_grpblk_t last; |
| 1576 | ext4_grpblk_t add; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1577 | struct buffer_head *bh; |
Yongqiang Yang | d89651c | 2012-01-04 17:09:48 -0500 | [diff] [blame] | 1578 | int err; |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1579 | ext4_group_t group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1580 | |
Laurent Vivier | bd81d8e | 2006-10-11 01:21:10 -0700 | [diff] [blame] | 1581 | o_blocks_count = ext4_blocks_count(es); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1582 | |
| 1583 | if (test_opt(sb, DEBUG)) |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 1584 | ext4_msg(sb, KERN_DEBUG, |
| 1585 | "extending last group from %llu to %llu blocks", |
| 1586 | o_blocks_count, n_blocks_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1587 | |
| 1588 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) |
| 1589 | return 0; |
| 1590 | |
| 1591 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 1592 | ext4_msg(sb, KERN_ERR, |
| 1593 | "filesystem too large to resize to %llu blocks safely", |
| 1594 | n_blocks_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1595 | if (sizeof(sector_t) < 8) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1596 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1597 | return -EINVAL; |
| 1598 | } |
| 1599 | |
| 1600 | if (n_blocks_count < o_blocks_count) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1601 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
Yongqiang Yang | 8f82f84 | 2011-07-26 21:35:44 -0400 | [diff] [blame] | 1602 | return -EINVAL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1603 | } |
| 1604 | |
| 1605 | /* Handle the remaining blocks in the last group only. */ |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1606 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1607 | |
| 1608 | if (last == 0) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1609 | ext4_warning(sb, "need to use ext2online to resize further"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1610 | return -EPERM; |
| 1611 | } |
| 1612 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1613 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1614 | |
| 1615 | if (o_blocks_count + add < o_blocks_count) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1616 | ext4_warning(sb, "blocks_count overflow"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1617 | return -EINVAL; |
| 1618 | } |
| 1619 | |
| 1620 | if (o_blocks_count + add > n_blocks_count) |
| 1621 | add = n_blocks_count - o_blocks_count; |
| 1622 | |
| 1623 | if (o_blocks_count + add < n_blocks_count) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1624 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1625 | o_blocks_count + add, add); |
| 1626 | |
| 1627 | /* See if the device is actually as big as what was requested */ |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1628 | bh = sb_bread(sb, o_blocks_count + add - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1629 | if (!bh) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1630 | ext4_warning(sb, "can't read last block, resize aborted"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1631 | return -ENOSPC; |
| 1632 | } |
| 1633 | brelse(bh); |
| 1634 | |
Yongqiang Yang | d89651c | 2012-01-04 17:09:48 -0500 | [diff] [blame] | 1635 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1636 | return err; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1637 | } /* ext4_group_extend */ |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1638 | |
| 1639 | /* |
| 1640 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count |
| 1641 | * |
| 1642 | * @sb: super block of the fs to be resized |
| 1643 | * @n_blocks_count: the number of blocks resides in the resized fs |
| 1644 | */ |
| 1645 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) |
| 1646 | { |
| 1647 | struct ext4_new_flex_group_data *flex_gd = NULL; |
| 1648 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1649 | struct ext4_super_block *es = sbi->s_es; |
| 1650 | struct buffer_head *bh; |
| 1651 | struct inode *resize_inode; |
| 1652 | ext4_fsblk_t o_blocks_count; |
| 1653 | ext4_group_t o_group; |
| 1654 | ext4_group_t n_group; |
Lukas Czerner | a0ade1d | 2012-02-20 23:02:06 -0500 | [diff] [blame] | 1655 | ext4_grpblk_t offset, add; |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1656 | unsigned long n_desc_blocks; |
| 1657 | unsigned long o_desc_blocks; |
| 1658 | unsigned long desc_blocks; |
| 1659 | int err = 0, flexbg_size = 1; |
| 1660 | |
| 1661 | o_blocks_count = ext4_blocks_count(es); |
| 1662 | |
| 1663 | if (test_opt(sb, DEBUG)) |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 1664 | ext4_msg(sb, KERN_DEBUG, "resizing filesystem from %llu " |
| 1665 | "to %llu blocks", o_blocks_count, n_blocks_count); |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1666 | |
| 1667 | if (n_blocks_count < o_blocks_count) { |
| 1668 | /* On-line shrinking not supported */ |
| 1669 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
| 1670 | return -EINVAL; |
| 1671 | } |
| 1672 | |
| 1673 | if (n_blocks_count == o_blocks_count) |
| 1674 | /* Nothing need to do */ |
| 1675 | return 0; |
| 1676 | |
| 1677 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); |
Lukas Czerner | a0ade1d | 2012-02-20 23:02:06 -0500 | [diff] [blame] | 1678 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1679 | |
| 1680 | n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) / |
| 1681 | EXT4_DESC_PER_BLOCK(sb); |
| 1682 | o_desc_blocks = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
| 1683 | EXT4_DESC_PER_BLOCK(sb); |
| 1684 | desc_blocks = n_desc_blocks - o_desc_blocks; |
| 1685 | |
| 1686 | if (desc_blocks && |
| 1687 | (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE) || |
| 1688 | le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks)) { |
| 1689 | ext4_warning(sb, "No reserved GDT blocks, can't resize"); |
| 1690 | return -EPERM; |
| 1691 | } |
| 1692 | |
| 1693 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); |
| 1694 | if (IS_ERR(resize_inode)) { |
| 1695 | ext4_warning(sb, "Error opening resize inode"); |
| 1696 | return PTR_ERR(resize_inode); |
| 1697 | } |
| 1698 | |
| 1699 | /* See if the device is actually as big as what was requested */ |
| 1700 | bh = sb_bread(sb, n_blocks_count - 1); |
| 1701 | if (!bh) { |
| 1702 | ext4_warning(sb, "can't read last block, resize aborted"); |
| 1703 | return -ENOSPC; |
| 1704 | } |
| 1705 | brelse(bh); |
| 1706 | |
Lukas Czerner | a0ade1d | 2012-02-20 23:02:06 -0500 | [diff] [blame] | 1707 | /* extend the last group */ |
| 1708 | if (n_group == o_group) |
| 1709 | add = n_blocks_count - o_blocks_count; |
| 1710 | else |
| 1711 | add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); |
| 1712 | if (add > 0) { |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1713 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
| 1714 | if (err) |
| 1715 | goto out; |
| 1716 | } |
| 1717 | |
| 1718 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && |
| 1719 | es->s_log_groups_per_flex) |
| 1720 | flexbg_size = 1 << es->s_log_groups_per_flex; |
| 1721 | |
Yongqiang Yang | d7574ad | 2012-09-05 01:23:50 -0400 | [diff] [blame^] | 1722 | if (ext4_blocks_count(es) == n_blocks_count) |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1723 | goto out; |
| 1724 | |
| 1725 | flex_gd = alloc_flex_gd(flexbg_size); |
| 1726 | if (flex_gd == NULL) { |
| 1727 | err = -ENOMEM; |
| 1728 | goto out; |
| 1729 | } |
| 1730 | |
| 1731 | /* Add flex groups. Note that a regular group is a |
| 1732 | * flex group with 1 group. |
| 1733 | */ |
| 1734 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, |
| 1735 | flexbg_size)) { |
Yongqiang Yang | 03c1c29 | 2012-09-05 01:21:50 -0400 | [diff] [blame] | 1736 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
| 1737 | break; |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1738 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
| 1739 | if (unlikely(err)) |
| 1740 | break; |
| 1741 | } |
| 1742 | |
| 1743 | out: |
| 1744 | if (flex_gd) |
| 1745 | free_flex_gd(flex_gd); |
| 1746 | |
| 1747 | iput(resize_inode); |
| 1748 | if (test_opt(sb, DEBUG)) |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 1749 | ext4_msg(sb, KERN_DEBUG, "resized filesystem from %llu " |
| 1750 | "upto %llu blocks", o_blocks_count, n_blocks_count); |
Yongqiang Yang | 19c5246 | 2012-01-04 17:09:44 -0500 | [diff] [blame] | 1751 | return err; |
| 1752 | } |