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-rw-r--r--lib/ext2fs/initialize.c671
1 files changed, 671 insertions, 0 deletions
diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
new file mode 100644
index 0000000..edd692b
--- /dev/null
+++ b/lib/ext2fs/initialize.c
@@ -0,0 +1,671 @@
+/*
+ * initialize.c --- initialize a filesystem handle given superblock
+ * parameters. Used by mke2fs when initializing a filesystem.
+ *
+ * Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#if defined(__linux__) && defined(EXT2_OS_LINUX)
+#define CREATOR_OS EXT2_OS_LINUX
+#else
+#if defined(__GNU__) && defined(EXT2_OS_HURD)
+#define CREATOR_OS EXT2_OS_HURD
+#else
+#if defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD)
+#define CREATOR_OS EXT2_OS_FREEBSD
+#else
+#if defined(LITES) && defined(EXT2_OS_LITES)
+#define CREATOR_OS EXT2_OS_LITES
+#else
+#define CREATOR_OS EXT2_OS_LINUX /* by default */
+#endif /* defined(LITES) && defined(EXT2_OS_LITES) */
+#endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */
+#endif /* defined(__GNU__) && defined(EXT2_OS_HURD) */
+#endif /* defined(__linux__) && defined(EXT2_OS_LINUX) */
+
+/*
+ * Calculate the number of GDT blocks to reserve for online filesystem growth.
+ * The absolute maximum number of GDT blocks we can reserve is determined by
+ * the number of block pointers that can fit into a single block.
+ */
+static unsigned int calc_reserved_gdt_blocks(ext2_filsys fs)
+{
+ struct ext2_super_block *sb = fs->super;
+ unsigned long bpg = sb->s_blocks_per_group;
+ unsigned int gdpb = EXT2_DESC_PER_BLOCK(sb);
+ unsigned long max_blocks = 0xffffffff;
+ unsigned long rsv_groups;
+ unsigned int rsv_gdb;
+
+ /* We set it at 1024x the current filesystem size, or
+ * the upper block count limit (2^32), whichever is lower.
+ */
+ if (ext2fs_blocks_count(sb) < max_blocks / 1024)
+ max_blocks = ext2fs_blocks_count(sb) * 1024;
+ /*
+ * ext2fs_div64_ceil() is unnecessary because max_blocks is
+ * max _GDT_ blocks, which is limited to 32 bits.
+ */
+ rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg);
+ rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks;
+ if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb))
+ rsv_gdb = EXT2_ADDR_PER_BLOCK(sb);
+#ifdef RES_GDT_DEBUG
+ printf("max_blocks %lu, rsv_groups = %lu, rsv_gdb = %u\n",
+ max_blocks, rsv_groups, rsv_gdb);
+#endif
+
+ return rsv_gdb;
+}
+
+errcode_t ext2fs_initialize(const char *name, int flags,
+ struct ext2_super_block *param,
+ io_manager manager, ext2_filsys *ret_fs)
+{
+ ext2_filsys fs;
+ errcode_t retval;
+ struct ext2_super_block *super;
+ unsigned int rem;
+ unsigned int overhead = 0;
+ unsigned int ipg;
+ dgrp_t i;
+ blk64_t free_blocks;
+ blk_t numblocks;
+ int rsv_gdt;
+ int csum_flag;
+ int bigalloc_flag;
+ int io_flags;
+ int has_bg;
+ unsigned reserved_inos;
+ char *buf = 0;
+ char c;
+ double reserved_ratio;
+ char *time_env;
+
+ if (!param || !ext2fs_blocks_count(param))
+ return EXT2_ET_INVALID_ARGUMENT;
+
+ retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
+ if (retval)
+ return retval;
+
+ memset(fs, 0, sizeof(struct struct_ext2_filsys));
+ fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
+ fs->flags = flags | EXT2_FLAG_RW;
+ fs->umask = 022;
+ fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
+#ifdef WORDS_BIGENDIAN
+ fs->flags |= EXT2_FLAG_SWAP_BYTES;
+#endif
+
+ time_env = getenv("E2FSPROGS_FAKE_TIME");
+ if (time_env)
+ fs->now = strtoul(time_env, NULL, 0);
+
+ io_flags = IO_FLAG_RW;
+ if (flags & EXT2_FLAG_EXCLUSIVE)
+ io_flags |= IO_FLAG_EXCLUSIVE;
+ if (flags & EXT2_FLAG_DIRECT_IO)
+ io_flags |= IO_FLAG_DIRECT_IO;
+ io_flags |= O_BINARY;
+ retval = manager->open(name, io_flags, &fs->io);
+ if (retval)
+ goto cleanup;
+ fs->image_io = fs->io;
+ fs->io->app_data = fs;
+ retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
+ if (retval)
+ goto cleanup;
+
+ strcpy(fs->device_name, name);
+ retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
+ if (retval)
+ goto cleanup;
+ fs->super = super;
+
+ memset(super, 0, SUPERBLOCK_SIZE);
+
+#define set_field(field, default) (super->field = param->field ? \
+ param->field : (default))
+#define assign_field(field) (super->field = param->field)
+
+ super->s_magic = EXT2_SUPER_MAGIC;
+ super->s_state = EXT2_VALID_FS;
+
+ bigalloc_flag = ext2fs_has_feature_bigalloc(param);
+
+ assign_field(s_log_block_size);
+
+ if (bigalloc_flag) {
+ set_field(s_log_cluster_size, super->s_log_block_size+4);
+ if (super->s_log_block_size > super->s_log_cluster_size) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+ } else
+ super->s_log_cluster_size = super->s_log_block_size;
+
+ set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
+ set_field(s_max_mnt_count, 0);
+ set_field(s_errors, EXT2_ERRORS_DEFAULT);
+ set_field(s_feature_compat, 0);
+ set_field(s_feature_incompat, 0);
+ set_field(s_feature_ro_compat, 0);
+ set_field(s_default_mount_opts, 0);
+ set_field(s_first_meta_bg, 0);
+ set_field(s_raid_stride, 0); /* default stride size: 0 */
+ set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */
+ set_field(s_log_groups_per_flex, 0);
+ set_field(s_flags, 0);
+ assign_field(s_backup_bgs[0]);
+ assign_field(s_backup_bgs[1]);
+
+ assign_field(s_encoding);
+ assign_field(s_encoding_flags);
+
+ if (ext2fs_has_feature_casefold(param))
+ fs->encoding = ext2fs_load_nls_table(param->s_encoding);
+
+ if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
+ retval = EXT2_ET_UNSUPP_FEATURE;
+ goto cleanup;
+ }
+ if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
+ retval = EXT2_ET_RO_UNSUPP_FEATURE;
+ goto cleanup;
+ }
+
+ set_field(s_rev_level, EXT2_GOOD_OLD_REV);
+ if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
+ set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
+ set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
+ if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
+ int extra_isize = sizeof(struct ext2_inode_large) -
+ EXT2_GOOD_OLD_INODE_SIZE;
+ set_field(s_min_extra_isize, extra_isize);
+ set_field(s_want_extra_isize, extra_isize);
+ }
+ } else {
+ super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
+ super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
+ }
+
+ set_field(s_checkinterval, 0);
+ super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);
+
+ super->s_creator_os = CREATOR_OS;
+
+ fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
+ fs->cluster_ratio_bits = super->s_log_cluster_size -
+ super->s_log_block_size;
+
+ if (bigalloc_flag) {
+ unsigned long long bpg;
+
+ if (param->s_blocks_per_group &&
+ param->s_clusters_per_group &&
+ ((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
+ param->s_blocks_per_group)) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+ if (param->s_clusters_per_group)
+ assign_field(s_clusters_per_group);
+ else if (param->s_blocks_per_group)
+ super->s_clusters_per_group =
+ param->s_blocks_per_group /
+ EXT2FS_CLUSTER_RATIO(fs);
+ else if (super->s_log_cluster_size + 15 < 32)
+ super->s_clusters_per_group = fs->blocksize * 8;
+ else
+ super->s_clusters_per_group = (fs->blocksize - 1) * 8;
+ if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
+ super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
+ bpg = EXT2FS_C2B(fs,
+ (unsigned long long) super->s_clusters_per_group);
+ if (bpg >= (((unsigned long long) 1) << 32)) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+ super->s_blocks_per_group = bpg;
+ } else {
+ set_field(s_blocks_per_group, fs->blocksize * 8);
+ if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
+ super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
+ super->s_clusters_per_group = super->s_blocks_per_group;
+ }
+
+ ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
+ ~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
+ ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
+ if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+
+ set_field(s_mmp_update_interval, 0);
+
+ /*
+ * If we're creating an external journal device, we don't need
+ * to bother with the rest.
+ */
+ if (ext2fs_has_feature_journal_dev(super)) {
+ fs->group_desc_count = 0;
+ ext2fs_mark_super_dirty(fs);
+ *ret_fs = fs;
+ return 0;
+ }
+
+retry:
+ fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
+ ext2fs_blocks_count(super) - super->s_first_data_block,
+ EXT2_BLOCKS_PER_GROUP(super));
+ if (fs->group_desc_count == 0) {
+ retval = EXT2_ET_TOOSMALL;
+ goto cleanup;
+ }
+
+ set_field(s_desc_size,
+ ext2fs_has_feature_64bit(super) ?
+ EXT2_MIN_DESC_SIZE_64BIT : 0);
+
+ fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
+ EXT2_DESC_PER_BLOCK(super));
+
+ i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
+
+ if (ext2fs_has_feature_64bit(super) &&
+ (ext2fs_blocks_count(super) / i) >= (1ULL << 32))
+ set_field(s_inodes_count, ~0U);
+ else
+ set_field(s_inodes_count, ext2fs_blocks_count(super) / i);
+
+ /*
+ * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
+ * that we have enough inodes for the filesystem(!)
+ */
+ if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
+ super->s_inodes_count = EXT2_FIRST_INODE(super)+1;
+
+ /*
+ * There should be at least as many inodes as the user
+ * requested. Figure out how many inodes per group that
+ * should be. But make sure that we don't allocate more than
+ * one bitmap's worth of inodes each group.
+ */
+ ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
+ if (ipg > fs->blocksize * 8) {
+ if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
+ /* Try again with slightly different parameters */
+ super->s_blocks_per_group -= 8;
+ ext2fs_blocks_count_set(super,
+ ext2fs_blocks_count(param));
+ super->s_clusters_per_group = super->s_blocks_per_group;
+ goto retry;
+ } else {
+ retval = EXT2_ET_TOO_MANY_INODES;
+ goto cleanup;
+ }
+ }
+
+ if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
+ ipg = EXT2_MAX_INODES_PER_GROUP(super);
+
+ipg_retry:
+ super->s_inodes_per_group = ipg;
+
+ /*
+ * Make sure the number of inodes per group completely fills
+ * the inode table blocks in the descriptor. If not, add some
+ * additional inodes/group. Waste not, want not...
+ */
+ fs->inode_blocks_per_group = (((super->s_inodes_per_group *
+ EXT2_INODE_SIZE(super)) +
+ EXT2_BLOCK_SIZE(super) - 1) /
+ EXT2_BLOCK_SIZE(super));
+ super->s_inodes_per_group = ((fs->inode_blocks_per_group *
+ EXT2_BLOCK_SIZE(super)) /
+ EXT2_INODE_SIZE(super));
+ /*
+ * Finally, make sure the number of inodes per group is a
+ * multiple of 8. This is needed to simplify the bitmap
+ * splicing code.
+ */
+ if (super->s_inodes_per_group < 8)
+ super->s_inodes_per_group = 8;
+ super->s_inodes_per_group &= ~7;
+ fs->inode_blocks_per_group = (((super->s_inodes_per_group *
+ EXT2_INODE_SIZE(super)) +
+ EXT2_BLOCK_SIZE(super) - 1) /
+ EXT2_BLOCK_SIZE(super));
+
+ /*
+ * adjust inode count to reflect the adjusted inodes_per_group
+ */
+ if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
+ ipg--;
+ goto ipg_retry;
+ }
+ super->s_inodes_count = super->s_inodes_per_group *
+ fs->group_desc_count;
+ super->s_free_inodes_count = super->s_inodes_count;
+
+ /*
+ * check the number of reserved group descriptor table blocks
+ */
+ if (ext2fs_has_feature_resize_inode(super))
+ rsv_gdt = calc_reserved_gdt_blocks(fs);
+ else
+ rsv_gdt = 0;
+ set_field(s_reserved_gdt_blocks, rsv_gdt);
+ if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
+ retval = EXT2_ET_RES_GDT_BLOCKS;
+ goto cleanup;
+ }
+ /* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
+ if (super->s_reserved_gdt_blocks + fs->desc_blocks >
+ super->s_blocks_per_group * 3 / 4) {
+ ext2fs_set_feature_meta_bg(fs->super);
+ ext2fs_clear_feature_resize_inode(fs->super);
+ set_field(s_reserved_gdt_blocks, 0);
+ }
+
+ /*
+ * Calculate the maximum number of bookkeeping blocks per
+ * group. It includes the superblock, the block group
+ * descriptors, the block bitmap, the inode bitmap, the inode
+ * table, and the reserved gdt blocks.
+ */
+ overhead = (int) (3 + fs->inode_blocks_per_group +
+ super->s_reserved_gdt_blocks);
+
+ if (ext2fs_has_feature_meta_bg(fs->super))
+ overhead++;
+ else
+ overhead += fs->desc_blocks;
+
+ /* This can only happen if the user requested too many inodes */
+ if (overhead > super->s_blocks_per_group) {
+ retval = EXT2_ET_TOO_MANY_INODES;
+ goto cleanup;
+ }
+
+ /*
+ * See if the last group is big enough to support the
+ * necessary data structures. If not, we need to get rid of
+ * it. We need to recalculate the overhead for the last block
+ * group, since it might or might not have a superblock
+ * backup.
+ */
+ overhead = (int) (2 + fs->inode_blocks_per_group);
+ has_bg = 0;
+ if (ext2fs_has_feature_sparse_super2(super)) {
+ /*
+ * We have to do this manually since
+ * super->s_backup_bgs hasn't been set up yet.
+ */
+ if (fs->group_desc_count == 2)
+ has_bg = param->s_backup_bgs[0] != 0;
+ else
+ has_bg = param->s_backup_bgs[1] != 0;
+ } else
+ has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
+ if (has_bg)
+ overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
+ rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
+ super->s_blocks_per_group);
+ if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
+ retval = EXT2_ET_TOOSMALL;
+ goto cleanup;
+ }
+ if (rem && (rem < overhead+50)) {
+ ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
+ rem);
+ /*
+ * If blocks count is changed, we need to recalculate
+ * reserved blocks count not to exceed 50%.
+ */
+ reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
+ ext2fs_blocks_count(param);
+ ext2fs_r_blocks_count_set(super, reserved_ratio *
+ ext2fs_blocks_count(super) / 100.0);
+
+ goto retry;
+ }
+
+ /*
+ * At this point we know how big the filesystem will be. So
+ * we can do any and all allocations that depend on the block
+ * count.
+ */
+
+ /* Set up the locations of the backup superblocks */
+ if (ext2fs_has_feature_sparse_super2(super)) {
+ if (super->s_backup_bgs[0] >= fs->group_desc_count)
+ super->s_backup_bgs[0] = fs->group_desc_count - 1;
+ if (super->s_backup_bgs[1] >= fs->group_desc_count)
+ super->s_backup_bgs[1] = fs->group_desc_count - 1;
+ if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
+ super->s_backup_bgs[1] = 0;
+ if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
+ __u32 t = super->s_backup_bgs[0];
+ super->s_backup_bgs[0] = super->s_backup_bgs[1];
+ super->s_backup_bgs[1] = t;
+ }
+ }
+
+ retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
+ if (retval)
+ goto cleanup;
+
+ strcpy(buf, "block bitmap for ");
+ strcat(buf, fs->device_name);
+ retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
+ if (retval)
+ goto cleanup;
+
+ strcpy(buf, "inode bitmap for ");
+ strcat(buf, fs->device_name);
+ retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
+ if (retval)
+ goto cleanup;
+
+ ext2fs_free_mem(&buf);
+
+ retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
+ &fs->group_desc);
+ if (retval)
+ goto cleanup;
+
+ memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);
+
+ /*
+ * Reserve the superblock and group descriptors for each
+ * group, and fill in the correct group statistics for group.
+ * Note that although the block bitmap, inode bitmap, and
+ * inode table have not been allocated (and in fact won't be
+ * by this routine), they are accounted for nevertheless.
+ *
+ * If FLEX_BG meta-data grouping is used, only account for the
+ * superblock and group descriptors (the inode tables and
+ * bitmaps will be accounted for when allocated).
+ */
+ free_blocks = 0;
+ csum_flag = ext2fs_has_group_desc_csum(fs);
+ reserved_inos = super->s_first_ino;
+ for (i = 0; i < fs->group_desc_count; i++) {
+ /*
+ * Don't set the BLOCK_UNINIT group for the last group
+ * because the block bitmap needs to be padded.
+ */
+ if (csum_flag) {
+ if (i != fs->group_desc_count - 1)
+ ext2fs_bg_flags_set(fs, i,
+ EXT2_BG_BLOCK_UNINIT);
+ ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
+ numblocks = super->s_inodes_per_group;
+ if (reserved_inos) {
+ if (numblocks > reserved_inos) {
+ numblocks -= reserved_inos;
+ reserved_inos = 0;
+ } else {
+ reserved_inos -= numblocks;
+ numblocks = 0;
+ }
+ }
+ ext2fs_bg_itable_unused_set(fs, i, numblocks);
+ }
+ numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
+ if (fs->super->s_log_groups_per_flex)
+ numblocks += 2 + fs->inode_blocks_per_group;
+
+ free_blocks += numblocks;
+ ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
+ ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
+ ext2fs_bg_used_dirs_count_set(fs, i, 0);
+ ext2fs_group_desc_csum_set(fs, i);
+ }
+ free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
+ ext2fs_free_blocks_count_set(super, free_blocks);
+
+ c = (char) 255;
+ if (((int) c) == -1) {
+ super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
+ } else {
+ super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
+ }
+
+ ext2fs_mark_super_dirty(fs);
+ ext2fs_mark_bb_dirty(fs);
+ ext2fs_mark_ib_dirty(fs);
+
+ io_channel_set_blksize(fs->io, fs->blocksize);
+
+ *ret_fs = fs;
+ return 0;
+cleanup:
+ free(buf);
+ ext2fs_free(fs);
+ return retval;
+}
+
+errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs, int super_only)
+{
+ blk64_t blk;
+ ext2_ino_t ino;
+ unsigned int group = 0;
+ unsigned int count = 0;
+ int total_free = 0;
+ int group_free = 0;
+ int last_allocated = 0;
+ int uninit;
+
+ /*
+ * First calculate the block statistics
+ */
+ uninit = 1;
+ for (blk = fs->super->s_first_data_block;
+ blk < ext2fs_blocks_count(fs->super); blk++) {
+ if (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk)) {
+ group_free++;
+ total_free++;
+ } else {
+ uninit = 0;
+ }
+ count++;
+ if ((count == fs->super->s_blocks_per_group) ||
+ (blk == ext2fs_blocks_count(fs->super)-1)) {
+ ext2fs_bg_free_blocks_count_set(fs, group,
+ group_free);
+ if (!super_only) {
+ if (uninit && blk !=
+ ext2fs_blocks_count(fs->super) - 1)
+ ext2fs_bg_flags_set(fs, group,
+ EXT2_BG_BLOCK_UNINIT);
+ else
+ ext2fs_bg_flags_clear(fs, group,
+ EXT2_BG_BLOCK_UNINIT);
+ }
+ count = 0;
+ group_free = 0;
+ uninit = 1;
+ group++;
+ }
+ }
+ total_free = EXT2FS_C2B(fs, total_free);
+ ext2fs_free_blocks_count_set(fs->super, total_free);
+
+ /*
+ * Next, calculate the inode statistics
+ */
+ group_free = 0;
+ total_free = 0;
+ last_allocated = 0;
+ count = 0;
+ group = 0;
+
+ /* Protect loop from wrap-around if s_inodes_count maxed */
+ for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
+ if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino)) {
+ group_free++;
+ total_free++;
+ } else {
+ last_allocated = ino;
+ }
+ count++;
+ if ((count == fs->super->s_inodes_per_group) ||
+ (ino == fs->super->s_inodes_count)) {
+ if (!super_only) {
+ if (last_allocated) {
+ ext2fs_bg_flags_clear(fs, group,
+ EXT2_BG_INODE_UNINIT);
+ ext2fs_bg_itable_unused_set(fs, group,
+ fs->super->s_inodes_per_group -
+ (last_allocated %
+ fs->super->s_inodes_per_group));
+ } else {
+ ext2fs_bg_flags_set(fs, group,
+ EXT2_BG_INODE_UNINIT);
+ ext2fs_bg_itable_unused_set(fs, group,
+ 0);
+ }
+ ext2fs_bg_free_inodes_count_set(fs, group,
+ group_free);
+ }
+ group++;
+ count = 0;
+ group_free = 0;
+ last_allocated = 0;
+ }
+ }
+ fs->super->s_free_inodes_count = total_free;
+ ext2fs_mark_super_dirty(fs);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 18:07:32 +0000