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/balloc.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * Enhanced block allocation by Stephen Tweedie (sct@redhat.com), 1993 |
| 10 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 11 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 12 | */ |
| 13 | |
| 14 | #include <linux/time.h> |
| 15 | #include <linux/capability.h> |
| 16 | #include <linux/fs.h> |
Mingming Cao | dab291a | 2006-10-11 01:21:01 -0700 | [diff] [blame] | 17 | #include <linux/jbd2.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 18 | #include <linux/quotaops.h> |
| 19 | #include <linux/buffer_head.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 20 | #include "ext4.h" |
| 21 | #include "ext4_jbd2.h" |
Aneesh Kumar K.V | e21675d | 2009-01-05 21:36:02 -0500 | [diff] [blame] | 22 | #include "mballoc.h" |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 23 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 24 | #include <trace/events/ext4.h> |
| 25 | |
Eric Sandeen | 5f163cc | 2012-01-04 22:33:28 -0500 | [diff] [blame] | 26 | static unsigned ext4_num_base_meta_clusters(struct super_block *sb, |
| 27 | ext4_group_t block_group); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 28 | /* |
| 29 | * balloc.c contains the blocks allocation and deallocation routines |
| 30 | */ |
| 31 | |
| 32 | /* |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 33 | * Calculate block group number for a given block number |
| 34 | */ |
| 35 | ext4_group_t ext4_get_group_number(struct super_block *sb, |
| 36 | ext4_fsblk_t block) |
| 37 | { |
| 38 | ext4_group_t group; |
| 39 | |
| 40 | if (test_opt2(sb, STD_GROUP_SIZE)) |
Theodore Ts'o | 960fd856 | 2013-07-05 23:11:16 -0400 | [diff] [blame] | 41 | group = (block - |
| 42 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) >> |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 43 | (EXT4_BLOCK_SIZE_BITS(sb) + EXT4_CLUSTER_BITS(sb) + 3); |
| 44 | else |
| 45 | ext4_get_group_no_and_offset(sb, block, &group, NULL); |
| 46 | return group; |
| 47 | } |
| 48 | |
| 49 | /* |
Theodore Ts'o | 3212a80 | 2011-09-09 18:46:51 -0400 | [diff] [blame] | 50 | * Calculate the block group number and offset into the block/cluster |
| 51 | * allocation bitmap, given a block number |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 52 | */ |
| 53 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 54 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp) |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 55 | { |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 56 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 57 | ext4_grpblk_t offset; |
| 58 | |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 59 | blocknr = blocknr - le32_to_cpu(es->s_first_data_block); |
Theodore Ts'o | 3212a80 | 2011-09-09 18:46:51 -0400 | [diff] [blame] | 60 | offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >> |
| 61 | EXT4_SB(sb)->s_cluster_bits; |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 62 | if (offsetp) |
| 63 | *offsetp = offset; |
| 64 | if (blockgrpp) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 65 | *blockgrpp = blocknr; |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 66 | |
| 67 | } |
| 68 | |
Lukas Czerner | 6891100 | 2013-04-03 22:12:52 -0400 | [diff] [blame] | 69 | /* |
| 70 | * Check whether the 'block' lives within the 'block_group'. Returns 1 if so |
| 71 | * and 0 otherwise. |
| 72 | */ |
| 73 | static inline int ext4_block_in_group(struct super_block *sb, |
| 74 | ext4_fsblk_t block, |
| 75 | ext4_group_t block_group) |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 76 | { |
| 77 | ext4_group_t actual_group; |
Lukas Czerner | 6891100 | 2013-04-03 22:12:52 -0400 | [diff] [blame] | 78 | |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 79 | actual_group = ext4_get_group_number(sb, block); |
Lukas Czerner | 6891100 | 2013-04-03 22:12:52 -0400 | [diff] [blame] | 80 | return (actual_group == block_group) ? 1 : 0; |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 81 | } |
| 82 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 83 | /* Return the number of clusters used for file system metadata; this |
| 84 | * represents the overhead needed by the file system. |
| 85 | */ |
| 86 | unsigned ext4_num_overhead_clusters(struct super_block *sb, |
| 87 | ext4_group_t block_group, |
| 88 | struct ext4_group_desc *gdp) |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 89 | { |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 90 | unsigned num_clusters; |
| 91 | int block_cluster = -1, inode_cluster = -1, itbl_cluster = -1, i, c; |
| 92 | ext4_fsblk_t start = ext4_group_first_block_no(sb, block_group); |
| 93 | ext4_fsblk_t itbl_blk; |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 94 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 95 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 96 | /* This is the number of clusters used by the superblock, |
| 97 | * block group descriptors, and reserved block group |
| 98 | * descriptor blocks */ |
| 99 | num_clusters = ext4_num_base_meta_clusters(sb, block_group); |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 100 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 101 | /* |
| 102 | * For the allocation bitmaps and inode table, we first need |
| 103 | * to check to see if the block is in the block group. If it |
| 104 | * is, then check to see if the cluster is already accounted |
| 105 | * for in the clusters used for the base metadata cluster, or |
| 106 | * if we can increment the base metadata cluster to include |
| 107 | * that block. Otherwise, we will have to track the cluster |
| 108 | * used for the allocation bitmap or inode table explicitly. |
| 109 | * Normally all of these blocks are contiguous, so the special |
| 110 | * case handling shouldn't be necessary except for *very* |
| 111 | * unusual file system layouts. |
| 112 | */ |
| 113 | if (ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp), block_group)) { |
Theodore Ts'o | b0dd6b7 | 2012-06-07 18:56:06 -0400 | [diff] [blame] | 114 | block_cluster = EXT4_B2C(sbi, |
| 115 | ext4_block_bitmap(sb, gdp) - start); |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 116 | if (block_cluster < num_clusters) |
| 117 | block_cluster = -1; |
| 118 | else if (block_cluster == num_clusters) { |
| 119 | num_clusters++; |
| 120 | block_cluster = -1; |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 121 | } |
| 122 | } |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 123 | |
| 124 | if (ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp), block_group)) { |
| 125 | inode_cluster = EXT4_B2C(sbi, |
Theodore Ts'o | b0dd6b7 | 2012-06-07 18:56:06 -0400 | [diff] [blame] | 126 | ext4_inode_bitmap(sb, gdp) - start); |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 127 | if (inode_cluster < num_clusters) |
| 128 | inode_cluster = -1; |
| 129 | else if (inode_cluster == num_clusters) { |
| 130 | num_clusters++; |
| 131 | inode_cluster = -1; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | itbl_blk = ext4_inode_table(sb, gdp); |
| 136 | for (i = 0; i < sbi->s_itb_per_group; i++) { |
| 137 | if (ext4_block_in_group(sb, itbl_blk + i, block_group)) { |
Theodore Ts'o | b0dd6b7 | 2012-06-07 18:56:06 -0400 | [diff] [blame] | 138 | c = EXT4_B2C(sbi, itbl_blk + i - start); |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 139 | if ((c < num_clusters) || (c == inode_cluster) || |
| 140 | (c == block_cluster) || (c == itbl_cluster)) |
| 141 | continue; |
| 142 | if (c == num_clusters) { |
| 143 | num_clusters++; |
| 144 | continue; |
| 145 | } |
| 146 | num_clusters++; |
| 147 | itbl_cluster = c; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | if (block_cluster != -1) |
| 152 | num_clusters++; |
| 153 | if (inode_cluster != -1) |
| 154 | num_clusters++; |
| 155 | |
| 156 | return num_clusters; |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 157 | } |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 158 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 159 | static unsigned int num_clusters_in_group(struct super_block *sb, |
| 160 | ext4_group_t block_group) |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 161 | { |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 162 | unsigned int blocks; |
| 163 | |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 164 | if (block_group == ext4_get_groups_count(sb) - 1) { |
| 165 | /* |
| 166 | * Even though mke2fs always initializes the first and |
| 167 | * last group, just in case some other tool was used, |
| 168 | * we need to make sure we calculate the right free |
| 169 | * blocks. |
| 170 | */ |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 171 | blocks = ext4_blocks_count(EXT4_SB(sb)->s_es) - |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 172 | ext4_group_first_block_no(sb, block_group); |
| 173 | } else |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 174 | blocks = EXT4_BLOCKS_PER_GROUP(sb); |
| 175 | return EXT4_NUM_B2C(EXT4_SB(sb), blocks); |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 176 | } |
| 177 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 178 | /* Initializes an uninitialized block bitmap */ |
| 179 | void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh, |
| 180 | ext4_group_t block_group, |
| 181 | struct ext4_group_desc *gdp) |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 182 | { |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 183 | unsigned int bit, bit_max; |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 184 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 185 | ext4_fsblk_t start, tmp; |
| 186 | int flex_bg = 0; |
Darrick J. Wong | bdfb6ff | 2013-08-28 18:46:56 -0400 | [diff] [blame] | 187 | struct ext4_group_info *grp; |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 188 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 189 | J_ASSERT_BH(bh, buffer_locked(bh)); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 190 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 191 | /* If checksum is bad mark all blocks used to prevent allocation |
| 192 | * essentially implementing a per-group read-only flag. */ |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 193 | if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 194 | ext4_error(sb, "Checksum bad for group %u", block_group); |
Darrick J. Wong | bdfb6ff | 2013-08-28 18:46:56 -0400 | [diff] [blame] | 195 | grp = ext4_get_group_info(sb, block_group); |
| 196 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); |
| 197 | set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 198 | return; |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 199 | } |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 200 | memset(bh->b_data, 0, sb->s_blocksize); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 201 | |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 202 | bit_max = ext4_num_base_meta_clusters(sb, block_group); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 203 | for (bit = 0; bit < bit_max; bit++) |
| 204 | ext4_set_bit(bit, bh->b_data); |
Akinobu Mita | d00a6d7 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 205 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 206 | start = ext4_group_first_block_no(sb, block_group); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 207 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 208 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
| 209 | flex_bg = 1; |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 210 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 211 | /* Set bits for block and inode bitmaps, and inode table */ |
| 212 | tmp = ext4_block_bitmap(sb, gdp); |
| 213 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 214 | ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 215 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 216 | tmp = ext4_inode_bitmap(sb, gdp); |
| 217 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 218 | ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 219 | |
| 220 | tmp = ext4_inode_table(sb, gdp); |
| 221 | for (; tmp < ext4_inode_table(sb, gdp) + |
| 222 | sbi->s_itb_per_group; tmp++) { |
Jose R. Santos | 0bf7e83 | 2008-06-03 14:07:29 -0400 | [diff] [blame] | 223 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 224 | ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 225 | } |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 226 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 227 | /* |
| 228 | * Also if the number of blocks within the group is less than |
| 229 | * the blocksize * 8 ( which is the size of bitmap ), set rest |
| 230 | * of the block bitmap to 1 |
| 231 | */ |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 232 | ext4_mark_bitmap_end(num_clusters_in_group(sb, block_group), |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 233 | sb->s_blocksize * 8, bh->b_data); |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 234 | ext4_block_bitmap_csum_set(sb, block_group, gdp, bh); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 235 | ext4_group_desc_csum_set(sb, block_group, gdp); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 236 | } |
| 237 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 238 | /* Return the number of free blocks in a block group. It is used when |
| 239 | * the block bitmap is uninitialized, so we can't just count the bits |
| 240 | * in the bitmap. */ |
Theodore Ts'o | cff1dfd7 | 2011-09-09 19:12:51 -0400 | [diff] [blame] | 241 | unsigned ext4_free_clusters_after_init(struct super_block *sb, |
| 242 | ext4_group_t block_group, |
| 243 | struct ext4_group_desc *gdp) |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 244 | { |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 245 | return num_clusters_in_group(sb, block_group) - |
| 246 | ext4_num_overhead_clusters(sb, block_group, gdp); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 247 | } |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 248 | |
Andrew Morton | 72b64b5 | 2006-10-11 01:21:18 -0700 | [diff] [blame] | 249 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 250 | * The free blocks are managed by bitmaps. A file system contains several |
| 251 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap |
| 252 | * block for inodes, N blocks for the inode table and data blocks. |
| 253 | * |
| 254 | * The file system contains group descriptors which are located after the |
| 255 | * super block. Each descriptor contains the number of the bitmap block and |
| 256 | * the free blocks count in the block. The descriptors are loaded in memory |
Aneesh Kumar K.V | e627432 | 2007-02-20 13:57:58 -0800 | [diff] [blame] | 257 | * when a file system is mounted (see ext4_fill_super). |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 258 | */ |
| 259 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 260 | /** |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 261 | * ext4_get_group_desc() -- load group descriptor from disk |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 262 | * @sb: super block |
| 263 | * @block_group: given block group |
| 264 | * @bh: pointer to the buffer head to store the block |
| 265 | * group descriptor |
| 266 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 267 | struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb, |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 268 | ext4_group_t block_group, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 269 | struct buffer_head **bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 270 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 271 | unsigned int group_desc; |
| 272 | unsigned int offset; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 273 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 274 | struct ext4_group_desc *desc; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 275 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 276 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 277 | if (block_group >= ngroups) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 278 | ext4_error(sb, "block_group >= groups_count - block_group = %u," |
| 279 | " groups_count = %u", block_group, ngroups); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 280 | |
| 281 | return NULL; |
| 282 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 283 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 284 | group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb); |
| 285 | offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 286 | if (!sbi->s_group_desc[group_desc]) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 287 | ext4_error(sb, "Group descriptor not loaded - " |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 288 | "block_group = %u, group_desc = %u, desc = %u", |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 289 | block_group, group_desc, offset); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 290 | return NULL; |
| 291 | } |
| 292 | |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 293 | desc = (struct ext4_group_desc *)( |
| 294 | (__u8 *)sbi->s_group_desc[group_desc]->b_data + |
| 295 | offset * EXT4_DESC_SIZE(sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 296 | if (bh) |
| 297 | *bh = sbi->s_group_desc[group_desc]; |
Alexandre Ratchov | 0d1ee42 | 2006-10-11 01:21:14 -0700 | [diff] [blame] | 298 | return desc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 299 | } |
| 300 | |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 301 | /* |
| 302 | * Return the block number which was discovered to be invalid, or 0 if |
| 303 | * the block bitmap is valid. |
| 304 | */ |
| 305 | static ext4_fsblk_t ext4_valid_block_bitmap(struct super_block *sb, |
| 306 | struct ext4_group_desc *desc, |
Darrick J. Wong | dbde0ab | 2013-08-28 15:59:51 -0400 | [diff] [blame] | 307 | ext4_group_t block_group, |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 308 | struct buffer_head *bh) |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 309 | { |
| 310 | ext4_grpblk_t offset; |
| 311 | ext4_grpblk_t next_zero_bit; |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 312 | ext4_fsblk_t blk; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 313 | ext4_fsblk_t group_first_block; |
| 314 | |
| 315 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { |
| 316 | /* with FLEX_BG, the inode/block bitmaps and itable |
| 317 | * blocks may not be in the group at all |
| 318 | * so the bitmap validation will be skipped for those groups |
| 319 | * or it has to also read the block group where the bitmaps |
| 320 | * are located to verify they are set. |
| 321 | */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 322 | return 0; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 323 | } |
| 324 | group_first_block = ext4_group_first_block_no(sb, block_group); |
| 325 | |
| 326 | /* check whether block bitmap block number is set */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 327 | blk = ext4_block_bitmap(sb, desc); |
| 328 | offset = blk - group_first_block; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 329 | if (!ext4_test_bit(offset, bh->b_data)) |
| 330 | /* bad block bitmap */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 331 | return blk; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 332 | |
| 333 | /* check whether the inode bitmap block number is set */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 334 | blk = ext4_inode_bitmap(sb, desc); |
| 335 | offset = blk - group_first_block; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 336 | if (!ext4_test_bit(offset, bh->b_data)) |
| 337 | /* bad block bitmap */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 338 | return blk; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 339 | |
| 340 | /* check whether the inode table block number is set */ |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 341 | blk = ext4_inode_table(sb, desc); |
| 342 | offset = blk - group_first_block; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 343 | next_zero_bit = ext4_find_next_zero_bit(bh->b_data, |
| 344 | offset + EXT4_SB(sb)->s_itb_per_group, |
| 345 | offset); |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 346 | if (next_zero_bit < offset + EXT4_SB(sb)->s_itb_per_group) |
| 347 | /* bad bitmap for inode tables */ |
| 348 | return blk; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 349 | return 0; |
| 350 | } |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 351 | |
| 352 | void ext4_validate_block_bitmap(struct super_block *sb, |
| 353 | struct ext4_group_desc *desc, |
Darrick J. Wong | dbde0ab | 2013-08-28 15:59:51 -0400 | [diff] [blame] | 354 | ext4_group_t block_group, |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 355 | struct buffer_head *bh) |
| 356 | { |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 357 | ext4_fsblk_t blk; |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 358 | struct ext4_group_info *grp = ext4_get_group_info(sb, block_group); |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 359 | |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 360 | if (buffer_verified(bh)) |
| 361 | return; |
| 362 | |
| 363 | ext4_lock_group(sb, block_group); |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 364 | blk = ext4_valid_block_bitmap(sb, desc, block_group, bh); |
| 365 | if (unlikely(blk != 0)) { |
| 366 | ext4_unlock_group(sb, block_group); |
| 367 | ext4_error(sb, "bg %u: block %llu: invalid block bitmap", |
| 368 | block_group, blk); |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 369 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 370 | return; |
| 371 | } |
| 372 | if (unlikely(!ext4_block_bitmap_csum_verify(sb, block_group, |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 373 | desc, bh))) { |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 374 | ext4_unlock_group(sb, block_group); |
| 375 | ext4_error(sb, "bg %u: bad block bitmap checksum", block_group); |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 376 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); |
Theodore Ts'o | 7a4c5de | 2012-08-10 13:57:52 -0400 | [diff] [blame] | 377 | return; |
| 378 | } |
| 379 | set_buffer_verified(bh); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 380 | ext4_unlock_group(sb, block_group); |
| 381 | } |
| 382 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 383 | /** |
Eryu Guan | 15b4913 | 2013-01-12 16:33:25 -0500 | [diff] [blame] | 384 | * ext4_read_block_bitmap_nowait() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 385 | * @sb: super block |
| 386 | * @block_group: given block group |
| 387 | * |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 388 | * Read the bitmap for a given block_group,and validate the |
| 389 | * bits for block/inode/inode tables are set in the bitmaps |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 390 | * |
| 391 | * Return buffer_head on success or NULL in case of failure. |
| 392 | */ |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 393 | struct buffer_head * |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 394 | ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 395 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 396 | struct ext4_group_desc *desc; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 397 | struct buffer_head *bh; |
Aneesh Kumar K.V | 7c9e69f | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 398 | ext4_fsblk_t bitmap_blk; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 399 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 400 | desc = ext4_get_group_desc(sb, block_group, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 401 | if (!desc) |
Aneesh Kumar K.V | 7c9e69f | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 402 | return NULL; |
| 403 | bitmap_blk = ext4_block_bitmap(sb, desc); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 404 | bh = sb_getblk(sb, bitmap_blk); |
| 405 | if (unlikely(!bh)) { |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 406 | ext4_error(sb, "Cannot get buffer for block bitmap - " |
| 407 | "block_group = %u, block_bitmap = %llu", |
| 408 | block_group, bitmap_blk); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 409 | return NULL; |
| 410 | } |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 411 | |
| 412 | if (bitmap_uptodate(bh)) |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 413 | goto verify; |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 414 | |
Frederic Bohe | c806e68 | 2008-10-10 08:09:18 -0400 | [diff] [blame] | 415 | lock_buffer(bh); |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 416 | if (bitmap_uptodate(bh)) { |
| 417 | unlock_buffer(bh); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 418 | goto verify; |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 419 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 420 | ext4_lock_group(sb, block_group); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 421 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
| 422 | ext4_init_block_bitmap(sb, bh, block_group, desc); |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 423 | set_bitmap_uptodate(bh); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 424 | set_buffer_uptodate(bh); |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 425 | ext4_unlock_group(sb, block_group); |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 426 | unlock_buffer(bh); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 427 | return bh; |
| 428 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 429 | ext4_unlock_group(sb, block_group); |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 430 | if (buffer_uptodate(bh)) { |
| 431 | /* |
| 432 | * if not uninit if bh is uptodate, |
| 433 | * bitmap is also uptodate |
| 434 | */ |
| 435 | set_bitmap_uptodate(bh); |
| 436 | unlock_buffer(bh); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 437 | goto verify; |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 438 | } |
| 439 | /* |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 440 | * submit the buffer_head for reading |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 441 | */ |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 442 | set_buffer_new(bh); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 443 | trace_ext4_read_block_bitmap_load(sb, block_group); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 444 | bh->b_end_io = ext4_end_bitmap_read; |
| 445 | get_bh(bh); |
Theodore Ts'o | 9f20350 | 2013-04-20 15:46:17 -0400 | [diff] [blame] | 446 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 447 | return bh; |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 448 | verify: |
| 449 | ext4_validate_block_bitmap(sb, desc, block_group, bh); |
Darrick J. Wong | 48d9eb9 | 2013-08-28 15:35:27 -0400 | [diff] [blame] | 450 | if (buffer_verified(bh)) |
| 451 | return bh; |
| 452 | put_bh(bh); |
| 453 | return NULL; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | /* Returns 0 on success, 1 on error */ |
| 457 | int ext4_wait_block_bitmap(struct super_block *sb, ext4_group_t block_group, |
| 458 | struct buffer_head *bh) |
| 459 | { |
| 460 | struct ext4_group_desc *desc; |
| 461 | |
| 462 | if (!buffer_new(bh)) |
| 463 | return 0; |
| 464 | desc = ext4_get_group_desc(sb, block_group, NULL); |
| 465 | if (!desc) |
| 466 | return 1; |
| 467 | wait_on_buffer(bh); |
| 468 | if (!buffer_uptodate(bh)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 469 | ext4_error(sb, "Cannot read block bitmap - " |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 470 | "block_group = %u, block_bitmap = %llu", |
Heiko Carstens | d4dc462 | 2012-02-20 17:57:24 -0500 | [diff] [blame] | 471 | block_group, (unsigned long long) bh->b_blocknr); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 472 | return 1; |
| 473 | } |
| 474 | clear_buffer_new(bh); |
| 475 | /* Panic or remount fs read-only if block bitmap is invalid */ |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 476 | ext4_validate_block_bitmap(sb, desc, block_group, bh); |
Darrick J. Wong | 48d9eb9 | 2013-08-28 15:35:27 -0400 | [diff] [blame] | 477 | /* ...but check for error just in case errors=continue. */ |
| 478 | return !buffer_verified(bh); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | struct buffer_head * |
| 482 | ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) |
| 483 | { |
| 484 | struct buffer_head *bh; |
| 485 | |
| 486 | bh = ext4_read_block_bitmap_nowait(sb, block_group); |
Eryu Guan | 15b4913 | 2013-01-12 16:33:25 -0500 | [diff] [blame] | 487 | if (!bh) |
| 488 | return NULL; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 489 | if (ext4_wait_block_bitmap(sb, block_group, bh)) { |
| 490 | put_bh(bh); |
Aneesh Kumar K.V | abcb294 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 491 | return NULL; |
| 492 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 493 | return bh; |
| 494 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 495 | |
| 496 | /** |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 497 | * ext4_has_free_clusters() |
Eric Sandeen | 8c3bf8a0 | 2008-10-28 00:08:12 -0400 | [diff] [blame] | 498 | * @sbi: in-core super block structure. |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 499 | * @nclusters: number of needed blocks |
| 500 | * @flags: flags from ext4_mb_new_blocks() |
Eric Sandeen | 8c3bf8a0 | 2008-10-28 00:08:12 -0400 | [diff] [blame] | 501 | * |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 502 | * Check if filesystem has nclusters free & available for allocation. |
Eric Sandeen | 8c3bf8a0 | 2008-10-28 00:08:12 -0400 | [diff] [blame] | 503 | * On success return 1, return 0 on failure. |
| 504 | */ |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 505 | static int ext4_has_free_clusters(struct ext4_sb_info *sbi, |
| 506 | s64 nclusters, unsigned int flags) |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 507 | { |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 508 | s64 free_clusters, dirty_clusters, rsv, resv_clusters; |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 509 | struct percpu_counter *fcc = &sbi->s_freeclusters_counter; |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 510 | struct percpu_counter *dcc = &sbi->s_dirtyclusters_counter; |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 511 | |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 512 | free_clusters = percpu_counter_read_positive(fcc); |
| 513 | dirty_clusters = percpu_counter_read_positive(dcc); |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 514 | resv_clusters = atomic64_read(&sbi->s_resv_clusters); |
Lukas Czerner | 304e220 | 2013-02-22 15:27:52 -0500 | [diff] [blame] | 515 | |
| 516 | /* |
| 517 | * r_blocks_count should always be multiple of the cluster ratio so |
| 518 | * we are safe to do a plane bit shift only. |
| 519 | */ |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 520 | rsv = (ext4_r_blocks_count(sbi->s_es) >> sbi->s_cluster_bits) + |
| 521 | resv_clusters; |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 522 | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 523 | if (free_clusters - (nclusters + rsv + dirty_clusters) < |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 524 | EXT4_FREECLUSTERS_WATERMARK) { |
Lukas Czerner | 304e220 | 2013-02-22 15:27:52 -0500 | [diff] [blame] | 525 | free_clusters = percpu_counter_sum_positive(fcc); |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 526 | dirty_clusters = percpu_counter_sum_positive(dcc); |
Aneesh Kumar K.V | 6bc6e63 | 2008-10-10 09:39:00 -0400 | [diff] [blame] | 527 | } |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 528 | /* Check whether we have space after accounting for current |
| 529 | * dirty clusters & root reserved clusters. |
Aneesh Kumar K.V | 6bc6e63 | 2008-10-10 09:39:00 -0400 | [diff] [blame] | 530 | */ |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 531 | if (free_clusters >= (rsv + nclusters + dirty_clusters)) |
Eric Sandeen | a996031 | 2008-10-28 00:08:17 -0400 | [diff] [blame] | 532 | return 1; |
Aneesh Kumar K.V | 5c79161 | 2008-10-08 23:12:24 -0400 | [diff] [blame] | 533 | |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 534 | /* Hm, nope. Are (enough) root reserved clusters available? */ |
Eric W. Biederman | 08cefc7 | 2012-02-07 15:41:49 -0800 | [diff] [blame] | 535 | if (uid_eq(sbi->s_resuid, current_fsuid()) || |
| 536 | (!gid_eq(sbi->s_resgid, GLOBAL_ROOT_GID) && in_group_p(sbi->s_resgid)) || |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 537 | capable(CAP_SYS_RESOURCE) || |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 538 | (flags & EXT4_MB_USE_ROOT_BLOCKS)) { |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 539 | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 540 | if (free_clusters >= (nclusters + dirty_clusters + |
| 541 | resv_clusters)) |
| 542 | return 1; |
| 543 | } |
| 544 | /* No free blocks. Let's see if we can dip into reserved pool */ |
| 545 | if (flags & EXT4_MB_USE_RESERVED) { |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 546 | if (free_clusters >= (nclusters + dirty_clusters)) |
Eric Sandeen | a996031 | 2008-10-28 00:08:17 -0400 | [diff] [blame] | 547 | return 1; |
| 548 | } |
| 549 | |
| 550 | return 0; |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 551 | } |
Mingming Cao | 0703143 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 552 | |
Theodore Ts'o | e7d5f31 | 2011-09-09 19:14:51 -0400 | [diff] [blame] | 553 | int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
| 554 | s64 nclusters, unsigned int flags) |
Eric Sandeen | 8c3bf8a0 | 2008-10-28 00:08:12 -0400 | [diff] [blame] | 555 | { |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 556 | if (ext4_has_free_clusters(sbi, nclusters, flags)) { |
Theodore Ts'o | e7d5f31 | 2011-09-09 19:14:51 -0400 | [diff] [blame] | 557 | percpu_counter_add(&sbi->s_dirtyclusters_counter, nclusters); |
Eric Sandeen | 8c3bf8a0 | 2008-10-28 00:08:12 -0400 | [diff] [blame] | 558 | return 0; |
| 559 | } else |
| 560 | return -ENOSPC; |
| 561 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 562 | |
| 563 | /** |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 564 | * ext4_should_retry_alloc() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 565 | * @sb: super block |
| 566 | * @retries number of attemps has been made |
| 567 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 568 | * ext4_should_retry_alloc() is called when ENOSPC is returned, and if |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 569 | * it is profitable to retry the operation, this function will wait |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 570 | * for the current or committing transaction to complete, and then |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 571 | * return TRUE. |
| 572 | * |
| 573 | * if the total number of retries exceed three times, return FALSE. |
| 574 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 575 | int ext4_should_retry_alloc(struct super_block *sb, int *retries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 576 | { |
Theodore Ts'o | df55c99 | 2011-09-09 19:16:51 -0400 | [diff] [blame] | 577 | if (!ext4_has_free_clusters(EXT4_SB(sb), 1, 0) || |
Eric Sandeen | 8f64b32 | 2009-02-26 00:57:35 -0500 | [diff] [blame] | 578 | (*retries)++ > 3 || |
| 579 | !EXT4_SB(sb)->s_journal) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 580 | return 0; |
| 581 | |
| 582 | jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id); |
| 583 | |
Mingming Cao | dab291a | 2006-10-11 01:21:01 -0700 | [diff] [blame] | 584 | return jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 587 | /* |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 588 | * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks |
| 589 | * |
| 590 | * @handle: handle to this transaction |
| 591 | * @inode: file inode |
| 592 | * @goal: given target block(filesystem wide) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 593 | * @count: pointer to total number of clusters needed |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 594 | * @errp: error code |
| 595 | * |
Theodore Ts'o | 97df5d1 | 2008-12-12 12:41:28 -0500 | [diff] [blame] | 596 | * Return 1st allocated block number on success, *count stores total account |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 597 | * error stores in errp pointer |
| 598 | */ |
| 599 | ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 600 | ext4_fsblk_t goal, unsigned int flags, |
| 601 | unsigned long *count, int *errp) |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 602 | { |
Theodore Ts'o | 97df5d1 | 2008-12-12 12:41:28 -0500 | [diff] [blame] | 603 | struct ext4_allocation_request ar; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 604 | ext4_fsblk_t ret; |
Theodore Ts'o | 97df5d1 | 2008-12-12 12:41:28 -0500 | [diff] [blame] | 605 | |
| 606 | memset(&ar, 0, sizeof(ar)); |
| 607 | /* Fill with neighbour allocated blocks */ |
| 608 | ar.inode = inode; |
| 609 | ar.goal = goal; |
| 610 | ar.len = count ? *count : 1; |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 611 | ar.flags = flags; |
Theodore Ts'o | 97df5d1 | 2008-12-12 12:41:28 -0500 | [diff] [blame] | 612 | |
| 613 | ret = ext4_mb_new_blocks(handle, &ar, errp); |
| 614 | if (count) |
| 615 | *count = ar.len; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 616 | /* |
Eric Sandeen | 72b8ab9 | 2010-05-16 11:00:00 -0400 | [diff] [blame] | 617 | * Account for the allocated meta blocks. We will never |
| 618 | * fail EDQUOT for metdata, but we do account for it. |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 619 | */ |
Theodore Ts'o | f232109 | 2011-01-10 12:12:36 -0500 | [diff] [blame] | 620 | if (!(*errp) && |
| 621 | ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) { |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 622 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
Theodore Ts'o | 97df5d1 | 2008-12-12 12:41:28 -0500 | [diff] [blame] | 623 | EXT4_I(inode)->i_allocated_meta_blocks += ar.len; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 624 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 625 | dquot_alloc_block_nofail(inode, |
| 626 | EXT4_C2B(EXT4_SB(inode->i_sb), ar.len)); |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 627 | } |
| 628 | return ret; |
| 629 | } |
| 630 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 631 | /** |
Theodore Ts'o | 5dee543 | 2011-09-09 19:10:51 -0400 | [diff] [blame] | 632 | * ext4_count_free_clusters() -- count filesystem free clusters |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 633 | * @sb: superblock |
| 634 | * |
Theodore Ts'o | 5dee543 | 2011-09-09 19:10:51 -0400 | [diff] [blame] | 635 | * Adds up the number of free clusters from each block group. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 636 | */ |
Theodore Ts'o | 5dee543 | 2011-09-09 19:10:51 -0400 | [diff] [blame] | 637 | ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 638 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 639 | ext4_fsblk_t desc_count; |
| 640 | struct ext4_group_desc *gdp; |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 641 | ext4_group_t i; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 642 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 643 | #ifdef EXT4FS_DEBUG |
| 644 | struct ext4_super_block *es; |
| 645 | ext4_fsblk_t bitmap_count; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 646 | unsigned int x; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 647 | struct buffer_head *bitmap_bh = NULL; |
| 648 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 649 | es = EXT4_SB(sb)->s_es; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 650 | desc_count = 0; |
| 651 | bitmap_count = 0; |
| 652 | gdp = NULL; |
| 653 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 654 | for (i = 0; i < ngroups; i++) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 655 | gdp = ext4_get_group_desc(sb, i, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 656 | if (!gdp) |
| 657 | continue; |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 658 | desc_count += ext4_free_group_clusters(sb, gdp); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 659 | brelse(bitmap_bh); |
Theodore Ts'o | 574ca17 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 660 | bitmap_bh = ext4_read_block_bitmap(sb, i); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 661 | if (bitmap_bh == NULL) |
| 662 | continue; |
| 663 | |
Theodore Ts'o | f6fb99c | 2012-06-30 19:14:57 -0400 | [diff] [blame] | 664 | x = ext4_count_free(bitmap_bh->b_data, |
| 665 | EXT4_BLOCKS_PER_GROUP(sb) / 8); |
Thadeu Lima de Souza Cascardo | 9fd9784 | 2009-01-26 19:26:26 -0500 | [diff] [blame] | 666 | printk(KERN_DEBUG "group %u: stored = %d, counted = %u\n", |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 667 | i, ext4_free_group_clusters(sb, gdp), x); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 668 | bitmap_count += x; |
| 669 | } |
| 670 | brelse(bitmap_bh); |
Theodore Ts'o | 5dee543 | 2011-09-09 19:10:51 -0400 | [diff] [blame] | 671 | printk(KERN_DEBUG "ext4_count_free_clusters: stored = %llu" |
| 672 | ", computed = %llu, %llu\n", |
Lukas Czerner | 810da24 | 2013-03-02 17:18:58 -0500 | [diff] [blame] | 673 | EXT4_NUM_B2C(EXT4_SB(sb), ext4_free_blocks_count(es)), |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 674 | desc_count, bitmap_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 675 | return bitmap_count; |
| 676 | #else |
| 677 | desc_count = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 678 | for (i = 0; i < ngroups; i++) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 679 | gdp = ext4_get_group_desc(sb, i, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 680 | if (!gdp) |
| 681 | continue; |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 682 | desc_count += ext4_free_group_clusters(sb, gdp); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 683 | } |
| 684 | |
| 685 | return desc_count; |
| 686 | #endif |
| 687 | } |
| 688 | |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 689 | static inline int test_root(ext4_group_t a, int b) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 690 | { |
Theodore Ts'o | f4afb4f | 2013-06-06 11:40:37 -0400 | [diff] [blame] | 691 | while (1) { |
| 692 | if (a < b) |
| 693 | return 0; |
| 694 | if (a == b) |
| 695 | return 1; |
| 696 | if ((a % b) != 0) |
| 697 | return 0; |
| 698 | a = a / b; |
| 699 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 700 | } |
| 701 | |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 702 | static int ext4_group_sparse(ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 703 | { |
| 704 | if (group <= 1) |
| 705 | return 1; |
| 706 | if (!(group & 1)) |
| 707 | return 0; |
| 708 | return (test_root(group, 7) || test_root(group, 5) || |
| 709 | test_root(group, 3)); |
| 710 | } |
| 711 | |
| 712 | /** |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 713 | * ext4_bg_has_super - number of blocks used by the superblock in group |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 714 | * @sb: superblock for filesystem |
| 715 | * @group: group number to check |
| 716 | * |
| 717 | * Return the number of blocks used by the superblock (primary or backup) |
| 718 | * in this group. Currently this will be only 0 or 1. |
| 719 | */ |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 720 | int ext4_bg_has_super(struct super_block *sb, ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 721 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 722 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 723 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) && |
| 724 | !ext4_group_sparse(group)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 725 | return 0; |
| 726 | return 1; |
| 727 | } |
| 728 | |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 729 | static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb, |
| 730 | ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 731 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 732 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 733 | ext4_group_t first = metagroup * EXT4_DESC_PER_BLOCK(sb); |
| 734 | ext4_group_t last = first + EXT4_DESC_PER_BLOCK(sb) - 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 735 | |
| 736 | if (group == first || group == first + 1 || group == last) |
| 737 | return 1; |
| 738 | return 0; |
| 739 | } |
| 740 | |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 741 | static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb, |
| 742 | ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 743 | { |
Theodore Ts'o | 8dadb19 | 2009-11-23 07:24:38 -0500 | [diff] [blame] | 744 | if (!ext4_bg_has_super(sb, group)) |
| 745 | return 0; |
| 746 | |
| 747 | if (EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG)) |
| 748 | return le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg); |
| 749 | else |
| 750 | return EXT4_SB(sb)->s_gdb_count; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | /** |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 754 | * ext4_bg_num_gdb - number of blocks used by the group table in group |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 755 | * @sb: superblock for filesystem |
| 756 | * @group: group number to check |
| 757 | * |
| 758 | * Return the number of blocks used by the group descriptor table |
| 759 | * (primary or backup) in this group. In the future there may be a |
| 760 | * different number of descriptor blocks in each group. |
| 761 | */ |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 762 | unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 763 | { |
| 764 | unsigned long first_meta_bg = |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 765 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg); |
| 766 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 767 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 768 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG) || |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 769 | metagroup < first_meta_bg) |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 770 | return ext4_bg_num_gdb_nometa(sb, group); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 771 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 772 | return ext4_bg_num_gdb_meta(sb,group); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 773 | |
| 774 | } |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 775 | |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 776 | /* |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 777 | * This function returns the number of file system metadata clusters at |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 778 | * the beginning of a block group, including the reserved gdt blocks. |
| 779 | */ |
Eric Sandeen | 5f163cc | 2012-01-04 22:33:28 -0500 | [diff] [blame] | 780 | static unsigned ext4_num_base_meta_clusters(struct super_block *sb, |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 781 | ext4_group_t block_group) |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 782 | { |
| 783 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 784 | unsigned num; |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 785 | |
| 786 | /* Check for superblock and gdt backups in this group */ |
| 787 | num = ext4_bg_has_super(sb, block_group); |
| 788 | |
| 789 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
| 790 | block_group < le32_to_cpu(sbi->s_es->s_first_meta_bg) * |
| 791 | sbi->s_desc_per_block) { |
| 792 | if (num) { |
| 793 | num += ext4_bg_num_gdb(sb, block_group); |
| 794 | num += le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks); |
| 795 | } |
| 796 | } else { /* For META_BG_BLOCK_GROUPS */ |
| 797 | num += ext4_bg_num_gdb(sb, block_group); |
| 798 | } |
Theodore Ts'o | d5b8f31 | 2011-09-09 18:44:51 -0400 | [diff] [blame] | 799 | return EXT4_NUM_B2C(sbi, num); |
Theodore Ts'o | 49f7f9a | 2011-09-09 18:40:51 -0400 | [diff] [blame] | 800 | } |
Eric Sandeen | f86186b | 2011-06-28 10:01:31 -0400 | [diff] [blame] | 801 | /** |
| 802 | * ext4_inode_to_goal_block - return a hint for block allocation |
| 803 | * @inode: inode for block allocation |
| 804 | * |
| 805 | * Return the ideal location to start allocating blocks for a |
| 806 | * newly created inode. |
| 807 | */ |
| 808 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *inode) |
| 809 | { |
| 810 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 811 | ext4_group_t block_group; |
| 812 | ext4_grpblk_t colour; |
| 813 | int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb)); |
| 814 | ext4_fsblk_t bg_start; |
| 815 | ext4_fsblk_t last_block; |
| 816 | |
| 817 | block_group = ei->i_block_group; |
| 818 | if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) { |
| 819 | /* |
| 820 | * If there are at least EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME |
| 821 | * block groups per flexgroup, reserve the first block |
| 822 | * group for directories and special files. Regular |
| 823 | * files will start at the second block group. This |
| 824 | * tends to speed up directory access and improves |
| 825 | * fsck times. |
| 826 | */ |
| 827 | block_group &= ~(flex_size-1); |
| 828 | if (S_ISREG(inode->i_mode)) |
| 829 | block_group++; |
| 830 | } |
| 831 | bg_start = ext4_group_first_block_no(inode->i_sb, block_group); |
| 832 | last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1; |
| 833 | |
| 834 | /* |
| 835 | * If we are doing delayed allocation, we don't need take |
| 836 | * colour into account. |
| 837 | */ |
| 838 | if (test_opt(inode->i_sb, DELALLOC)) |
| 839 | return bg_start; |
| 840 | |
| 841 | if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block) |
| 842 | colour = (current->pid % 16) * |
| 843 | (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16); |
| 844 | else |
| 845 | colour = (current->pid % 16) * ((last_block - bg_start) / 16); |
| 846 | return bg_start + colour; |
| 847 | } |
| 848 | |