^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/ext4/balloc.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1992, 1993, 1994, 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Remy Card (card@masi.ibp.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Laboratoire MASI - Institut Blaise Pascal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Universite Pierre et Marie Curie (Paris VI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Enhanced block allocation by Stephen Tweedie (sct@redhat.com), 1993
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Big-endian to little-endian byte-swapping/bitmaps by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * David S. Miller (davem@caip.rutgers.edu), 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/quotaops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "ext4.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "ext4_jbd2.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "mballoc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <trace/events/ext4.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static unsigned ext4_num_base_meta_clusters(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) ext4_group_t block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * balloc.c contains the blocks allocation and deallocation routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Calculate block group number for a given block number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) ext4_group_t ext4_get_group_number(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) ext4_fsblk_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ext4_group_t group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (test_opt2(sb, STD_GROUP_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) group = (block -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) (EXT4_BLOCK_SIZE_BITS(sb) + EXT4_CLUSTER_BITS(sb) + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) ext4_get_group_no_and_offset(sb, block, &group, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Calculate the block group number and offset into the block/cluster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * allocation bitmap, given a block number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct ext4_super_block *es = EXT4_SB(sb)->s_es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ext4_grpblk_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) EXT4_SB(sb)->s_cluster_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (offsetp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *offsetp = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (blockgrpp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) *blockgrpp = blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Check whether the 'block' lives within the 'block_group'. Returns 1 if so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * and 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static inline int ext4_block_in_group(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ext4_fsblk_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ext4_group_t block_group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) ext4_group_t actual_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) actual_group = ext4_get_group_number(sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return (actual_group == block_group) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* Return the number of clusters used for file system metadata; this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * represents the overhead needed by the file system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static unsigned ext4_num_overhead_clusters(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct ext4_group_desc *gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned num_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int block_cluster = -1, inode_cluster = -1, itbl_cluster = -1, i, c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ext4_fsblk_t start = ext4_group_first_block_no(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ext4_fsblk_t itbl_blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* This is the number of clusters used by the superblock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * block group descriptors, and reserved block group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * descriptor blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) num_clusters = ext4_num_base_meta_clusters(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * For the allocation bitmaps and inode table, we first need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * to check to see if the block is in the block group. If it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * is, then check to see if the cluster is already accounted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * for in the clusters used for the base metadata cluster, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * if we can increment the base metadata cluster to include
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * that block. Otherwise, we will have to track the cluster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * used for the allocation bitmap or inode table explicitly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * Normally all of these blocks are contiguous, so the special
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * case handling shouldn't be necessary except for *very*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * unusual file system layouts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp), block_group)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) block_cluster = EXT4_B2C(sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ext4_block_bitmap(sb, gdp) - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (block_cluster < num_clusters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) block_cluster = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) else if (block_cluster == num_clusters) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) block_cluster = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp), block_group)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) inode_cluster = EXT4_B2C(sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ext4_inode_bitmap(sb, gdp) - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (inode_cluster < num_clusters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) inode_cluster = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) else if (inode_cluster == num_clusters) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) inode_cluster = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) itbl_blk = ext4_inode_table(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) for (i = 0; i < sbi->s_itb_per_group; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (ext4_block_in_group(sb, itbl_blk + i, block_group)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) c = EXT4_B2C(sbi, itbl_blk + i - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if ((c < num_clusters) || (c == inode_cluster) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) (c == block_cluster) || (c == itbl_cluster))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (c == num_clusters) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) itbl_cluster = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (block_cluster != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (inode_cluster != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) num_clusters++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return num_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static unsigned int num_clusters_in_group(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) ext4_group_t block_group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsigned int blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (block_group == ext4_get_groups_count(sb) - 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Even though mke2fs always initializes the first and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * last group, just in case some other tool was used,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * we need to make sure we calculate the right free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) blocks = ext4_blocks_count(EXT4_SB(sb)->s_es) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) ext4_group_first_block_no(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) blocks = EXT4_BLOCKS_PER_GROUP(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return EXT4_NUM_B2C(EXT4_SB(sb), blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /* Initializes an uninitialized block bitmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int ext4_init_block_bitmap(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct ext4_group_desc *gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsigned int bit, bit_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) ext4_fsblk_t start, tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) J_ASSERT_BH(bh, buffer_locked(bh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* If checksum is bad mark all blocks used to prevent allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * essentially implementing a per-group read-only flag. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ext4_mark_group_bitmap_corrupted(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) EXT4_GROUP_INFO_BBITMAP_CORRUPT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) EXT4_GROUP_INFO_IBITMAP_CORRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return -EFSBADCRC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) memset(bh->b_data, 0, sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) bit_max = ext4_num_base_meta_clusters(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if ((bit_max >> 3) >= bh->b_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) for (bit = 0; bit < bit_max; bit++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ext4_set_bit(bit, bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) start = ext4_group_first_block_no(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /* Set bits for block and inode bitmaps, and inode table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) tmp = ext4_block_bitmap(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (ext4_block_in_group(sb, tmp, block_group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) tmp = ext4_inode_bitmap(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (ext4_block_in_group(sb, tmp, block_group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) tmp = ext4_inode_table(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) for (; tmp < ext4_inode_table(sb, gdp) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) sbi->s_itb_per_group; tmp++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (ext4_block_in_group(sb, tmp, block_group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * Also if the number of blocks within the group is less than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * the blocksize * 8 ( which is the size of bitmap ), set rest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * of the block bitmap to 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ext4_mark_bitmap_end(num_clusters_in_group(sb, block_group),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) sb->s_blocksize * 8, bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* Return the number of free blocks in a block group. It is used when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * the block bitmap is uninitialized, so we can't just count the bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * in the bitmap. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) unsigned ext4_free_clusters_after_init(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct ext4_group_desc *gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return num_clusters_in_group(sb, block_group) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ext4_num_overhead_clusters(sb, block_group, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * The free blocks are managed by bitmaps. A file system contains several
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * block for inodes, N blocks for the inode table and data blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * The file system contains group descriptors which are located after the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * super block. Each descriptor contains the number of the bitmap block and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * the free blocks count in the block. The descriptors are loaded in memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * when a file system is mounted (see ext4_fill_super).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * ext4_get_group_desc() -- load group descriptor from disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * @sb: super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * @block_group: given block group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * @bh: pointer to the buffer head to store the block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * group descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct buffer_head **bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) unsigned int group_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) unsigned int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) ext4_group_t ngroups = ext4_get_groups_count(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct ext4_group_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) struct buffer_head *bh_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (block_group >= ngroups) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ext4_error(sb, "block_group >= groups_count - block_group = %u,"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) " groups_count = %u", block_group, ngroups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) bh_p = sbi_array_rcu_deref(sbi, s_group_desc, group_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * sbi_array_rcu_deref returns with rcu unlocked, this is ok since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * the pointer being dereferenced won't be dereferenced again. By
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * looking at the usage in add_new_gdb() the value isn't modified,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * just the pointer, and so it remains valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (!bh_p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ext4_error(sb, "Group descriptor not loaded - "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) "block_group = %u, group_desc = %u, desc = %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) block_group, group_desc, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) desc = (struct ext4_group_desc *)(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) (__u8 *)bh_p->b_data +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) offset * EXT4_DESC_SIZE(sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) *bh = bh_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * Return the block number which was discovered to be invalid, or 0 if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * the block bitmap is valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static ext4_fsblk_t ext4_valid_block_bitmap(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct ext4_group_desc *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) ext4_grpblk_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) ext4_grpblk_t next_zero_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ext4_grpblk_t max_bit = EXT4_CLUSTERS_PER_GROUP(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ext4_fsblk_t blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ext4_fsblk_t group_first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (ext4_has_feature_flex_bg(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /* with FLEX_BG, the inode/block bitmaps and itable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * blocks may not be in the group at all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * so the bitmap validation will be skipped for those groups
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * or it has to also read the block group where the bitmaps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * are located to verify they are set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) group_first_block = ext4_group_first_block_no(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /* check whether block bitmap block number is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) blk = ext4_block_bitmap(sb, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) offset = blk - group_first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (offset < 0 || EXT4_B2C(sbi, offset) >= max_bit ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) !ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /* bad block bitmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* check whether the inode bitmap block number is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) blk = ext4_inode_bitmap(sb, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) offset = blk - group_first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (offset < 0 || EXT4_B2C(sbi, offset) >= max_bit ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) !ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /* bad block bitmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /* check whether the inode table block number is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) blk = ext4_inode_table(sb, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) offset = blk - group_first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (offset < 0 || EXT4_B2C(sbi, offset) >= max_bit ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) EXT4_B2C(sbi, offset + sbi->s_itb_per_group) >= max_bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) next_zero_bit = ext4_find_next_zero_bit(bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) EXT4_B2C(sbi, offset + sbi->s_itb_per_group),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) EXT4_B2C(sbi, offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (next_zero_bit <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) EXT4_B2C(sbi, offset + sbi->s_itb_per_group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /* bad bitmap for inode tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) static int ext4_validate_block_bitmap(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct ext4_group_desc *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) ext4_fsblk_t blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct ext4_group_info *grp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) grp = ext4_get_group_info(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (buffer_verified(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) ext4_lock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (buffer_verified(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) goto verified;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (unlikely(!ext4_block_bitmap_csum_verify(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) desc, bh) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) ext4_simulate_fail(sb, EXT4_SIM_BBITMAP_CRC))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) ext4_mark_group_bitmap_corrupted(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) EXT4_GROUP_INFO_BBITMAP_CORRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return -EFSBADCRC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) blk = ext4_valid_block_bitmap(sb, desc, block_group, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (unlikely(blk != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) ext4_error(sb, "bg %u: block %llu: invalid block bitmap",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) block_group, blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ext4_mark_group_bitmap_corrupted(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) EXT4_GROUP_INFO_BBITMAP_CORRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) set_buffer_verified(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) verified:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * ext4_read_block_bitmap_nowait()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * @sb: super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * @block_group: given block group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * Read the bitmap for a given block_group,and validate the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * bits for block/inode/inode tables are set in the bitmaps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * Return buffer_head on success or an ERR_PTR in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct buffer_head *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) bool ignore_locked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct ext4_group_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) ext4_fsblk_t bitmap_blk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) desc = ext4_get_group_desc(sb, block_group, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) bitmap_blk = ext4_block_bitmap(sb, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) ext4_error(sb, "Invalid block bitmap block %llu in "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) "block_group %u", bitmap_blk, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) ext4_mark_group_bitmap_corrupted(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) EXT4_GROUP_INFO_BBITMAP_CORRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) bh = sb_getblk(sb, bitmap_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (unlikely(!bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) ext4_warning(sb, "Cannot get buffer for block bitmap - "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) "block_group = %u, block_bitmap = %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) block_group, bitmap_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (ignore_locked && buffer_locked(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /* buffer under IO already, return if called for prefetching */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) put_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (bitmap_uptodate(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) goto verify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (bitmap_uptodate(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) goto verify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ext4_lock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (ext4_has_group_desc_csum(sb) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (block_group == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) ext4_error(sb, "Block bitmap for bg 0 marked "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) "uninitialized");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) err = -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) err = ext4_init_block_bitmap(sb, bh, block_group, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) set_bitmap_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) set_buffer_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) set_buffer_verified(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) ext4_error(sb, "Failed to init block bitmap for group "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) "%u: %d", block_group, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) goto verify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) ext4_unlock_group(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (buffer_uptodate(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * if not uninit if bh is uptodate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * bitmap is also uptodate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) set_bitmap_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) goto verify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * submit the buffer_head for reading
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) set_buffer_new(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) trace_ext4_read_block_bitmap_load(sb, block_group, ignore_locked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) ext4_read_bh_nowait(bh, REQ_META | REQ_PRIO |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) (ignore_locked ? REQ_RAHEAD : 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) ext4_end_bitmap_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) verify:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) err = ext4_validate_block_bitmap(sb, desc, block_group, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) put_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) /* Returns 0 on success, -errno on error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) int ext4_wait_block_bitmap(struct super_block *sb, ext4_group_t block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) struct ext4_group_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (!buffer_new(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) desc = ext4_get_group_desc(sb, block_group, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) wait_on_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) ext4_simulate_fail_bh(sb, bh, EXT4_SIM_BBITMAP_EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (!buffer_uptodate(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) ext4_error_err(sb, EIO, "Cannot read block bitmap - "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) "block_group = %u, block_bitmap = %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) block_group, (unsigned long long) bh->b_blocknr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) ext4_mark_group_bitmap_corrupted(sb, block_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) EXT4_GROUP_INFO_BBITMAP_CORRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) clear_buffer_new(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) /* Panic or remount fs read-only if block bitmap is invalid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) return ext4_validate_block_bitmap(sb, desc, block_group, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) struct buffer_head *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) bh = ext4_read_block_bitmap_nowait(sb, block_group, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) err = ext4_wait_block_bitmap(sb, block_group, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) put_bh(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * ext4_has_free_clusters()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * @sbi: in-core super block structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * @nclusters: number of needed blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * @flags: flags from ext4_mb_new_blocks()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * Check if filesystem has nclusters free & available for allocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * On success return 1, return 0 on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) static int ext4_has_free_clusters(struct ext4_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) s64 nclusters, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) s64 free_clusters, dirty_clusters, rsv, resv_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct percpu_counter *fcc = &sbi->s_freeclusters_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) struct percpu_counter *dcc = &sbi->s_dirtyclusters_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) free_clusters = percpu_counter_read_positive(fcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) dirty_clusters = percpu_counter_read_positive(dcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) resv_clusters = atomic64_read(&sbi->s_resv_clusters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * r_blocks_count should always be multiple of the cluster ratio so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * we are safe to do a plane bit shift only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) rsv = (ext4_r_blocks_count(sbi->s_es) >> sbi->s_cluster_bits) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) resv_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (free_clusters - (nclusters + rsv + dirty_clusters) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) EXT4_FREECLUSTERS_WATERMARK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) free_clusters = percpu_counter_sum_positive(fcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) dirty_clusters = percpu_counter_sum_positive(dcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) /* Check whether we have space after accounting for current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) * dirty clusters & root reserved clusters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (free_clusters >= (rsv + nclusters + dirty_clusters))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /* Hm, nope. Are (enough) root reserved clusters available? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (uid_eq(sbi->s_resuid, current_fsuid()) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) (!gid_eq(sbi->s_resgid, GLOBAL_ROOT_GID) && in_group_p(sbi->s_resgid)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) capable(CAP_SYS_RESOURCE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) (flags & EXT4_MB_USE_ROOT_BLOCKS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) if (free_clusters >= (nclusters + dirty_clusters +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) resv_clusters))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) /* No free blocks. Let's see if we can dip into reserved pool */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (flags & EXT4_MB_USE_RESERVED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if (free_clusters >= (nclusters + dirty_clusters))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) s64 nclusters, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (ext4_has_free_clusters(sbi, nclusters, flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) percpu_counter_add(&sbi->s_dirtyclusters_counter, nclusters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * ext4_should_retry_alloc() - check if a block allocation should be retried
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * @sb: superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * @retries: number of retry attempts made so far
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) * ext4_should_retry_alloc() is called when ENOSPC is returned while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) * attempting to allocate blocks. If there's an indication that a pending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * journal transaction might free some space and allow another attempt to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * succeed, this function will wait for the current or committing transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * to complete and then return TRUE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) int ext4_should_retry_alloc(struct super_block *sb, int *retries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) if (!sbi->s_journal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (++(*retries) > 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) percpu_counter_inc(&sbi->s_sra_exceeded_retry_limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) * if there's no indication that blocks are about to be freed it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) * possible we just missed a transaction commit that did so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (sbi->s_mb_free_pending == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return ext4_has_free_clusters(sbi, 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) * it's possible we've just missed a transaction commit here,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * so ignore the returned status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) (void) jbd2_journal_force_commit_nested(sbi->s_journal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * @handle: handle to this transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * @inode: file inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) * @goal: given target block(filesystem wide)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) * @count: pointer to total number of clusters needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) * @errp: error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) * Return 1st allocated block number on success, *count stores total account
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * error stores in errp pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) ext4_fsblk_t goal, unsigned int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) unsigned long *count, int *errp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) struct ext4_allocation_request ar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) ext4_fsblk_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) memset(&ar, 0, sizeof(ar));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /* Fill with neighbour allocated blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) ar.inode = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) ar.goal = goal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) ar.len = count ? *count : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) ar.flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) ret = ext4_mb_new_blocks(handle, &ar, errp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) if (count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) *count = ar.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * Account for the allocated meta blocks. We will never
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) * fail EDQUOT for metdata, but we do account for it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (!(*errp) && (flags & EXT4_MB_DELALLOC_RESERVED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) dquot_alloc_block_nofail(inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) EXT4_C2B(EXT4_SB(inode->i_sb), ar.len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) * ext4_count_free_clusters() -- count filesystem free clusters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) * @sb: superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * Adds up the number of free clusters from each block group.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) ext4_fsblk_t desc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) struct ext4_group_desc *gdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) ext4_group_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) ext4_group_t ngroups = ext4_get_groups_count(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct ext4_group_info *grp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) #ifdef EXT4FS_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) struct ext4_super_block *es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) ext4_fsblk_t bitmap_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) unsigned int x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) struct buffer_head *bitmap_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) es = EXT4_SB(sb)->s_es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) desc_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) bitmap_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) gdp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) for (i = 0; i < ngroups; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) gdp = ext4_get_group_desc(sb, i, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) if (!gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) grp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (EXT4_SB(sb)->s_group_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) grp = ext4_get_group_info(sb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) if (!grp || !EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) desc_count += ext4_free_group_clusters(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) brelse(bitmap_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) bitmap_bh = ext4_read_block_bitmap(sb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (IS_ERR(bitmap_bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) bitmap_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) x = ext4_count_free(bitmap_bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) EXT4_CLUSTERS_PER_GROUP(sb) / 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) printk(KERN_DEBUG "group %u: stored = %d, counted = %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) i, ext4_free_group_clusters(sb, gdp), x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) bitmap_count += x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) brelse(bitmap_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) printk(KERN_DEBUG "ext4_count_free_clusters: stored = %llu"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) ", computed = %llu, %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) EXT4_NUM_B2C(EXT4_SB(sb), ext4_free_blocks_count(es)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) desc_count, bitmap_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) return bitmap_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) desc_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) for (i = 0; i < ngroups; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) gdp = ext4_get_group_desc(sb, i, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (!gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) grp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (EXT4_SB(sb)->s_group_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) grp = ext4_get_group_info(sb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) if (!grp || !EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) desc_count += ext4_free_group_clusters(sb, gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return desc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) static inline int test_root(ext4_group_t a, int b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) if (a < b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (a == b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if ((a % b) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) a = a / b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) * ext4_bg_has_super - number of blocks used by the superblock in group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) * @sb: superblock for filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) * @group: group number to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) * Return the number of blocks used by the superblock (primary or backup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * in this group. Currently this will be only 0 or 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) int ext4_bg_has_super(struct super_block *sb, ext4_group_t group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) struct ext4_super_block *es = EXT4_SB(sb)->s_es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (group == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if (ext4_has_feature_sparse_super2(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) if (group == le32_to_cpu(es->s_backup_bgs[0]) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) group == le32_to_cpu(es->s_backup_bgs[1]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) if ((group <= 1) || !ext4_has_feature_sparse_super(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (!(group & 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (test_root(group, 3) || (test_root(group, 5)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) test_root(group, 7))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) ext4_group_t group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) ext4_group_t first = metagroup * EXT4_DESC_PER_BLOCK(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) ext4_group_t last = first + EXT4_DESC_PER_BLOCK(sb) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (group == first || group == first + 1 || group == last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) ext4_group_t group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) if (!ext4_bg_has_super(sb, group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if (ext4_has_feature_meta_bg(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) return le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) return EXT4_SB(sb)->s_gdb_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * ext4_bg_num_gdb - number of blocks used by the group table in group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) * @sb: superblock for filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) * @group: group number to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) * Return the number of blocks used by the group descriptor table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) * (primary or backup) in this group. In the future there may be a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) * different number of descriptor blocks in each group.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) unsigned long first_meta_bg =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) if (!ext4_has_feature_meta_bg(sb) || metagroup < first_meta_bg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) return ext4_bg_num_gdb_nometa(sb, group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) return ext4_bg_num_gdb_meta(sb,group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) * This function returns the number of file system metadata clusters at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) * the beginning of a block group, including the reserved gdt blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) static unsigned ext4_num_base_meta_clusters(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) ext4_group_t block_group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) unsigned num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) /* Check for superblock and gdt backups in this group */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) num = ext4_bg_has_super(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if (!ext4_has_feature_meta_bg(sb) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) block_group < le32_to_cpu(sbi->s_es->s_first_meta_bg) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) sbi->s_desc_per_block) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) if (num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) num += ext4_bg_num_gdb(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) num += le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) } else { /* For META_BG_BLOCK_GROUPS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) num += ext4_bg_num_gdb(sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) return EXT4_NUM_B2C(sbi, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) * ext4_inode_to_goal_block - return a hint for block allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * @inode: inode for block allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * Return the ideal location to start allocating blocks for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * newly created inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) ext4_fsblk_t ext4_inode_to_goal_block(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) struct ext4_inode_info *ei = EXT4_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) ext4_group_t block_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) ext4_grpblk_t colour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) ext4_fsblk_t bg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) ext4_fsblk_t last_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) block_group = ei->i_block_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) * If there are at least EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) * block groups per flexgroup, reserve the first block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) * group for directories and special files. Regular
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) * files will start at the second block group. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) * tends to speed up directory access and improves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) * fsck times.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) block_group &= ~(flex_size-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) if (S_ISREG(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) block_group++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) bg_start = ext4_group_first_block_no(inode->i_sb, block_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) * If we are doing delayed allocation, we don't need take
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) * colour into account.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (test_opt(inode->i_sb, DELALLOC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) return bg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) colour = (task_pid_nr(current) % 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) colour = (task_pid_nr(current) % 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) ((last_block - bg_start) / 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) return bg_start + colour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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