return err;
}
+/*
+ * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
+ * group each time.
+ */
+struct ext4_new_flex_group_data {
+ struct ext4_new_group_data *groups; /* new_group_data for groups
+ in the flex group */
+ __u16 *bg_flags; /* block group flags of groups
+ in @groups */
+ ext4_group_t count; /* number of groups in @groups
+ */
+};
+
+/*
+ * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
+ * @flexbg_size.
+ *
+ * Returns NULL on failure otherwise address of the allocated structure.
+ */
+static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
+{
+ struct ext4_new_flex_group_data *flex_gd;
+
+ flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
+ if (flex_gd == NULL)
+ goto out3;
+
+ flex_gd->count = flexbg_size;
+
+ flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
+ flexbg_size, GFP_NOFS);
+ if (flex_gd->groups == NULL)
+ goto out2;
+
+ flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
+ if (flex_gd->bg_flags == NULL)
+ goto out1;
+
+ return flex_gd;
+
+out1:
+ kfree(flex_gd->groups);
+out2:
+ kfree(flex_gd);
+out3:
+ return NULL;
+}
+
+static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
+{
+ kfree(flex_gd->bg_flags);
+ kfree(flex_gd->groups);
+ kfree(flex_gd);
+}
+
static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
ext4_fsblk_t blk)
{
return 0;
}
+/*
+ * set_flexbg_block_bitmap() mark @count blocks starting from @block used.
+ *
+ * Helper function for ext4_setup_new_group_blocks() which set .
+ *
+ * @sb: super block
+ * @handle: journal handle
+ * @flex_gd: flex group data
+ */
+static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
+ struct ext4_new_flex_group_data *flex_gd,
+ ext4_fsblk_t block, ext4_group_t count)
+{
+ ext4_group_t count2;
+
+ ext4_debug("mark blocks [%llu/%u] used\n", block, count);
+ for (count2 = count; count > 0; count -= count2, block += count2) {
+ ext4_fsblk_t start;
+ struct buffer_head *bh;
+ ext4_group_t group;
+ int err;
+
+ ext4_get_group_no_and_offset(sb, block, &group, NULL);
+ start = ext4_group_first_block_no(sb, group);
+ group -= flex_gd->groups[0].group;
+
+ count2 = sb->s_blocksize * 8 - (block - start);
+ if (count2 > count)
+ count2 = count;
+
+ if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
+ BUG_ON(flex_gd->count > 1);
+ continue;
+ }
+
+ err = extend_or_restart_transaction(handle, 1);
+ if (err)
+ return err;
+
+ bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
+ if (!bh)
+ return -EIO;
+
+ err = ext4_journal_get_write_access(handle, bh);
+ if (err)
+ return err;
+ ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
+ block - start, count2);
+ ext4_set_bits(bh->b_data, block - start, count2);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, bh);
+ if (unlikely(err))
+ return err;
+ brelse(bh);
+ }
+
+ return 0;
+}
+
+/*
+ * Set up the block and inode bitmaps, and the inode table for the new groups.
+ * This doesn't need to be part of the main transaction, since we are only
+ * changing blocks outside the actual filesystem. We still do journaling to
+ * ensure the recovery is correct in case of a failure just after resize.
+ * If any part of this fails, we simply abort the resize.
+ *
+ * setup_new_flex_group_blocks handles a flex group as follow:
+ * 1. copy super block and GDT, and initialize group tables if necessary.
+ * In this step, we only set bits in blocks bitmaps for blocks taken by
+ * super block and GDT.
+ * 2. allocate group tables in block bitmaps, that is, set bits in block
+ * bitmap for blocks taken by group tables.
+ */
+static int setup_new_flex_group_blocks(struct super_block *sb,
+ struct ext4_new_flex_group_data *flex_gd)
+{
+ int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
+ ext4_fsblk_t start;
+ ext4_fsblk_t block;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ struct ext4_new_group_data *group_data = flex_gd->groups;
+ __u16 *bg_flags = flex_gd->bg_flags;
+ handle_t *handle;
+ ext4_group_t group, count;
+ struct buffer_head *bh = NULL;
+ int reserved_gdb, i, j, err = 0, err2;
+
+ BUG_ON(!flex_gd->count || !group_data ||
+ group_data[0].group != sbi->s_groups_count);
+
+ reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
+
+ /* This transaction may be extended/restarted along the way */
+ handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+
+ group = group_data[0].group;
+ for (i = 0; i < flex_gd->count; i++, group++) {
+ unsigned long gdblocks;
+
+ gdblocks = ext4_bg_num_gdb(sb, group);
+ start = ext4_group_first_block_no(sb, group);
+
+ /* Copy all of the GDT blocks into the backup in this group */
+ for (j = 0, block = start + 1; j < gdblocks; j++, block++) {
+ struct buffer_head *gdb;
+
+ ext4_debug("update backup group %#04llx\n", block);
+ err = extend_or_restart_transaction(handle, 1);
+ if (err)
+ goto out;
+
+ gdb = sb_getblk(sb, block);
+ if (!gdb) {
+ err = -EIO;
+ goto out;
+ }
+
+ err = ext4_journal_get_write_access(handle, gdb);
+ if (err) {
+ brelse(gdb);
+ goto out;
+ }
+ memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
+ gdb->b_size);
+ set_buffer_uptodate(gdb);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, gdb);
+ if (unlikely(err)) {
+ brelse(gdb);
+ goto out;
+ }
+ brelse(gdb);
+ }
+
+ /* Zero out all of the reserved backup group descriptor
+ * table blocks
+ */
+ if (ext4_bg_has_super(sb, group)) {
+ err = sb_issue_zeroout(sb, gdblocks + start + 1,
+ reserved_gdb, GFP_NOFS);
+ if (err)
+ goto out;
+ }
+
+ /* Initialize group tables of the grop @group */
+ if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
+ goto handle_bb;
+
+ /* Zero out all of the inode table blocks */
+ block = group_data[i].inode_table;
+ ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
+ block, sbi->s_itb_per_group);
+ err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
+ GFP_NOFS);
+ if (err)
+ goto out;
+
+handle_bb:
+ if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
+ goto handle_ib;
+
+ /* Initialize block bitmap of the @group */
+ block = group_data[i].block_bitmap;
+ err = extend_or_restart_transaction(handle, 1);
+ if (err)
+ goto out;
+
+ bh = bclean(handle, sb, block);
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
+ goto out;
+ }
+ if (ext4_bg_has_super(sb, group)) {
+ ext4_debug("mark backup superblock %#04llx (+0)\n",
+ start);
+ ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb +
+ 1);
+ }
+ ext4_mark_bitmap_end(group_data[i].blocks_count,
+ sb->s_blocksize * 8, bh->b_data);
+ err = ext4_handle_dirty_metadata(handle, NULL, bh);
+ if (err)
+ goto out;
+ brelse(bh);
+
+handle_ib:
+ if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
+ continue;
+
+ /* Initialize inode bitmap of the @group */
+ block = group_data[i].inode_bitmap;
+ err = extend_or_restart_transaction(handle, 1);
+ if (err)
+ goto out;
+ /* Mark unused entries in inode bitmap used */
+ bh = bclean(handle, sb, block);
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
+ goto out;
+ }
+
+ ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
+ sb->s_blocksize * 8, bh->b_data);
+ err = ext4_handle_dirty_metadata(handle, NULL, bh);
+ if (err)
+ goto out;
+ brelse(bh);
+ }
+ bh = NULL;
+
+ /* Mark group tables in block bitmap */
+ for (j = 0; j < GROUP_TABLE_COUNT; j++) {
+ count = group_table_count[j];
+ start = (&group_data[0].block_bitmap)[j];
+ block = start;
+ for (i = 1; i < flex_gd->count; i++) {
+ block += group_table_count[j];
+ if (block == (&group_data[i].block_bitmap)[j]) {
+ count += group_table_count[j];
+ continue;
+ }
+ err = set_flexbg_block_bitmap(sb, handle,
+ flex_gd, start, count);
+ if (err)
+ goto out;
+ count = group_table_count[j];
+ start = group_data[i].block_bitmap;
+ block = start;
+ }
+
+ if (count) {
+ err = set_flexbg_block_bitmap(sb, handle,
+ flex_gd, start, count);
+ if (err)
+ goto out;
+ }
+ }
+
+out:
+ brelse(bh);
+ err2 = ext4_journal_stop(handle);
+ if (err2 && !err)
+ err = err2;
+
+ return err;
+}
+
/*
* Set up the block and inode bitmaps, and the inode table for the new group.
* This doesn't need to be part of the main transaction, since we are only
}
}
+/*
+ * ext4_add_new_descs() adds @count group descriptor of groups
+ * starting at @group
+ *
+ * @handle: journal handle
+ * @sb: super block
+ * @group: the group no. of the first group desc to be added
+ * @resize_inode: the resize inode
+ * @count: number of group descriptors to be added
+ */
+static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
+ ext4_group_t group, struct inode *resize_inode,
+ ext4_group_t count)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ struct buffer_head *gdb_bh;
+ int i, gdb_off, gdb_num, err = 0;
+
+ for (i = 0; i < count; i++, group++) {
+ int reserved_gdb = ext4_bg_has_super(sb, group) ?
+ le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
+
+ gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
+ gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
+
+ /*
+ * We will only either add reserved group blocks to a backup group
+ * or remove reserved blocks for the first group in a new group block.
+ * Doing both would be mean more complex code, and sane people don't
+ * use non-sparse filesystems anymore. This is already checked above.
+ */
+ if (gdb_off) {
+ gdb_bh = sbi->s_group_desc[gdb_num];
+ err = ext4_journal_get_write_access(handle, gdb_bh);
+
+ if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
+ err = reserve_backup_gdb(handle, resize_inode, group);
+ } else
+ err = add_new_gdb(handle, resize_inode, group);
+ if (err)
+ break;
+ }
+ return err;
+}
+
+/*
+ * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
+ */
+static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
+ struct ext4_new_flex_group_data *flex_gd)
+{
+ struct ext4_new_group_data *group_data = flex_gd->groups;
+ struct ext4_group_desc *gdp;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct buffer_head *gdb_bh;
+ ext4_group_t group;
+ __u16 *bg_flags = flex_gd->bg_flags;
+ int i, gdb_off, gdb_num, err = 0;
+
+
+ for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
+ group = group_data->group;
+
+ gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
+ gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
+
+ /*
+ * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
+ */
+ gdb_bh = sbi->s_group_desc[gdb_num];
+ /* Update group descriptor block for new group */
+ gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data +
+ gdb_off * EXT4_DESC_SIZE(sb));
+
+ memset(gdp, 0, EXT4_DESC_SIZE(sb));
+ ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
+ ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
+ ext4_inode_table_set(sb, gdp, group_data->inode_table);
+ ext4_free_group_clusters_set(sb, gdp,
+ EXT4_B2C(sbi, group_data->free_blocks_count));
+ ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags = cpu_to_le16(*bg_flags);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
+ if (unlikely(err)) {
+ ext4_std_error(sb, err);
+ break;
+ }
+
+ /*
+ * We can allocate memory for mb_alloc based on the new group
+ * descriptor
+ */
+ err = ext4_mb_add_groupinfo(sb, group, gdp);
+ if (err)
+ break;
+ }
+ return err;
+}
+
/* Add group descriptor data to an existing or new group descriptor block.
* Ensure we handle all possible error conditions _before_ we start modifying
* the filesystem, because we cannot abort the transaction and not have it
return err;
} /* ext4_group_add */
+/*
+ * extend a group without checking assuming that checking has been done.
+ */
+static int ext4_group_extend_no_check(struct super_block *sb,
+ ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
+{
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+ handle_t *handle;
+ int err = 0, err2;
+
+ /* We will update the superblock, one block bitmap, and
+ * one group descriptor via ext4_group_add_blocks().
+ */
+ handle = ext4_journal_start_sb(sb, 3);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ ext4_warning(sb, "error %d on journal start", err);
+ return err;
+ }
+
+ err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
+ if (err) {
+ ext4_warning(sb, "error %d on journal write access", err);
+ goto errout;
+ }
+
+ ext4_blocks_count_set(es, o_blocks_count + add);
+ ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
+ o_blocks_count + add);
+ /* We add the blocks to the bitmap and set the group need init bit */
+ err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
+ if (err)
+ goto errout;
+ ext4_handle_dirty_super(handle, sb);
+ ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
+ o_blocks_count + add);
+errout:
+ err2 = ext4_journal_stop(handle);
+ if (err2 && !err)
+ err = err2;
+
+ if (!err) {
+ if (test_opt(sb, DEBUG))
+ printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
+ "blocks\n", ext4_blocks_count(es));
+ update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es,
+ sizeof(struct ext4_super_block));
+ }
+ return err;
+}
+
/*
* Extend the filesystem to the new number of blocks specified. This entry
* point is only used to extend the current filesystem to the end of the last
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff