--- /dev/null
+/*
+ * linux/fs/ext3/resize.c
+ *
+ * Support for resizing an ext3 filesystem while it is mounted.
+ *
+ * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
+ *
+ * This could probably be made into a module, because it is not often in use.
+ */
+
+#include <linux/config.h>
+
+#define EXT3FS_DEBUG
+
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/ext3_jbd.h>
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+
+#define outside(b, first, last) ((b) < (first) || (b) >= (last))
+#define inside(b, first, last) ((b) >= (first) && (b) < (last))
+
+static int verify_group_input(struct super_block *sb,
+ struct ext3_new_group_data *input)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ unsigned start = le32_to_cpu(es->s_blocks_count);
+ unsigned end = start + input->blocks_count;
+ unsigned group = input->group;
+ unsigned itend = input->inode_table + EXT3_SB(sb)->s_itb_per_group;
+ unsigned overhead = ext3_bg_has_super(sb, group) ?
+ (1 + ext3_bg_num_gdb(sb, group) +
+ le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
+ unsigned metaend = start + overhead;
+ struct buffer_head *bh;
+ int free_blocks_count;
+ int err = -EINVAL;
+
+ input->free_blocks_count = free_blocks_count =
+ input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
+
+ if (test_opt(sb, DEBUG))
+ printk("EXT3-fs: adding %s group %u: %u blocks "
+ "(%d free, %u reserved)\n",
+ ext3_bg_has_super(sb, input->group) ? "normal" :
+ "no-super", input->group, input->blocks_count,
+ free_blocks_count, input->reserved_blocks);
+
+ if (group != sbi->s_groups_count)
+ ext3_warning(sb, __FUNCTION__,
+ "Cannot add at group %u (only %lu groups)",
+ input->group, sbi->s_groups_count);
+ else if ((start - le32_to_cpu(es->s_first_data_block)) %
+ EXT3_BLOCKS_PER_GROUP(sb))
+ ext3_warning(sb, __FUNCTION__, "Last group not full");
+ else if (input->reserved_blocks > input->blocks_count / 5)
+ ext3_warning(sb, __FUNCTION__, "Reserved blocks too high (%u)",
+ input->reserved_blocks);
+ else if (free_blocks_count < 0)
+ ext3_warning(sb, __FUNCTION__, "Bad blocks count %u",
+ input->blocks_count);
+ else if (!(bh = sb_bread(sb, end - 1)))
+ ext3_warning(sb, __FUNCTION__, "Cannot read last block (%u)",
+ end - 1);
+ else if (outside(input->block_bitmap, start, end))
+ ext3_warning(sb, __FUNCTION__,
+ "Block bitmap not in group (block %u)",
+ input->block_bitmap);
+ else if (outside(input->inode_bitmap, start, end))
+ ext3_warning(sb, __FUNCTION__,
+ "Inode bitmap not in group (block %u)",
+ input->inode_bitmap);
+ else if (outside(input->inode_table, start, end) ||
+ outside(itend - 1, start, end))
+ ext3_warning(sb, __FUNCTION__,
+ "Inode table not in group (blocks %u-%u)",
+ input->inode_table, itend - 1);
+ else if (input->inode_bitmap == input->block_bitmap)
+ ext3_warning(sb, __FUNCTION__,
+ "Block bitmap same as inode bitmap (%u)",
+ input->block_bitmap);
+ else if (inside(input->block_bitmap, input->inode_table, itend))
+ ext3_warning(sb, __FUNCTION__,
+ "Block bitmap (%u) in inode table (%u-%u)",
+ input->block_bitmap, input->inode_table, itend-1);
+ else if (inside(input->inode_bitmap, input->inode_table, itend))
+ ext3_warning(sb, __FUNCTION__,
+ "Inode bitmap (%u) in inode table (%u-%u)",
+ input->inode_bitmap, input->inode_table, itend-1);
+ else if (inside(input->block_bitmap, start, metaend))
+ ext3_warning(sb, __FUNCTION__,
+ "Block bitmap (%u) in GDT table (%u-%u)",
+ input->block_bitmap, start, metaend - 1);
+ else if (inside(input->inode_bitmap, start, metaend))
+ ext3_warning(sb, __FUNCTION__,
+ "Inode bitmap (%u) in GDT table (%u-%u)",
+ input->inode_bitmap, start, metaend - 1);
+ else if (inside(input->inode_table, start, metaend) ||
+ inside(itend - 1, start, metaend))
+ ext3_warning(sb, __FUNCTION__,
+ "Inode table (%u-%u) overlaps GDT table (%u-%u)",
+ input->inode_table, itend - 1, start, metaend - 1);
+ else {
+ brelse(bh);
+ err = 0;
+ }
+
+ return err;
+}
+
+static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
+ unsigned long blk)
+{
+ struct buffer_head *bh;
+ int err;
+
+ bh = sb_getblk(sb, blk);
+ set_buffer_uptodate(bh);
+ if ((err = ext3_journal_get_write_access(handle, bh))) {
+ brelse(bh);
+ bh = ERR_PTR(err);
+ } else
+ memset(bh->b_data, 0, sb->s_blocksize);
+
+ return bh;
+}
+
+/*
+ * To avoid calling the atomic setbit hundreds or thousands of times, we only
+ * need to use it within a single byte (to ensure we get endianness right).
+ * We can use memset for the rest of the bitmap as there are no other users.
+ */
+static void mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
+{
+ int i;
+
+ if (start_bit >= end_bit)
+ return;
+
+ ext3_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
+ for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
+ ext3_set_bit(i, bitmap);
+ if (i < end_bit)
+ memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
+}
+
+/*
+ * 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
+ * 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.
+ *
+ * We only pass inode because of the ext3 journal wrappers.
+ */
+static int setup_new_group_blocks(struct super_block *sb, struct inode *inode,
+ struct ext3_new_group_data *input)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ unsigned long start = input->group * sbi->s_blocks_per_group +
+ le32_to_cpu(sbi->s_es->s_first_data_block);
+ int reserved_gdb = ext3_bg_has_super(sb, input->group) ?
+ le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0;
+ unsigned long gdblocks = ext3_bg_num_gdb(sb, input->group);
+ struct buffer_head *bh;
+ handle_t *handle;
+ unsigned long block;
+ int bit;
+ int i;
+ int err = 0, err2;
+
+ handle = ext3_journal_start(inode, reserved_gdb + gdblocks +
+ 2 + sbi->s_itb_per_group);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+
+ lock_super(sb);
+ if (input->group != sbi->s_groups_count) {
+ err = -EBUSY;
+ goto exit_journal;
+ }
+
+ if (IS_ERR(bh = bclean(handle, sb, input->block_bitmap))) {
+ err = PTR_ERR(bh);
+ goto exit_journal;
+ }
+
+ if (ext3_bg_has_super(sb, input->group)) {
+ ext3_debug("mark backup superblock %#04lx (+0)\n", start);
+ ext3_set_bit(0, bh->b_data);
+ }
+
+ /* Copy all of the GDT blocks into the backup in this group */
+ for (i = 0, bit = 1, block = start + 1;
+ i < gdblocks; i++, block++, bit++) {
+ struct buffer_head *gdb;
+
+ ext3_debug("update backup group %#04lx (+%d)\n", block, bit);
+
+ gdb = sb_getblk(sb, block);
+ set_buffer_uptodate(gdb);
+ if ((err = ext3_journal_get_write_access(handle, gdb))) {
+ brelse(gdb);
+ goto exit_bh;
+ }
+ memcpy(gdb->b_data, sbi->s_group_desc[i], bh->b_size);
+ ext3_journal_dirty_metadata(handle, gdb);
+ ext3_set_bit(bit, bh->b_data);
+ brelse(gdb);
+ }
+
+ /* Zero out all of the reserved backup group descriptor table blocks */
+ for (i = 0, bit = gdblocks + 1, block = start + bit;
+ i < reserved_gdb; i++, block++, bit++) {
+ struct buffer_head *gdb;
+
+ ext3_debug("clear reserved block %#04lx (+%d)\n", block, bit);
+
+ if (IS_ERR(gdb = bclean(handle, sb, block))) {
+ err = PTR_ERR(bh);
+ goto exit_bh;
+ }
+ ext3_journal_dirty_metadata(handle, gdb);
+ ext3_set_bit(bit, bh->b_data);
+ brelse(gdb);
+ }
+ ext3_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap,
+ input->block_bitmap - start);
+ ext3_set_bit(input->block_bitmap - start, bh->b_data);
+ ext3_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap,
+ input->inode_bitmap - start);
+ ext3_set_bit(input->inode_bitmap - start, bh->b_data);
+
+ /* Zero out all of the inode table blocks */
+ for (i = 0, block = input->inode_table, bit = block - start;
+ i < sbi->s_itb_per_group; i++, bit++, block++) {
+ struct buffer_head *it;
+
+ ext3_debug("clear inode block %#04x (+%ld)\n", block, bit);
+ if (IS_ERR(it = bclean(handle, sb, block))) {
+ err = PTR_ERR(it);
+ goto exit_bh;
+ }
+ ext3_journal_dirty_metadata(handle, it);
+ brelse(it);
+ ext3_set_bit(bit, bh->b_data);
+ }
+ mark_bitmap_end(input->blocks_count, EXT3_BLOCKS_PER_GROUP(sb),
+ bh->b_data);
+ ext3_journal_dirty_metadata(handle, bh);
+ brelse(bh);
+
+ /* Mark unused entries in inode bitmap used */
+ ext3_debug("clear inode bitmap %#04x (+%ld)\n",
+ input->inode_bitmap, input->inode_bitmap - start);
+ if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) {
+ err = PTR_ERR(bh);
+ goto exit_journal;
+ }
+
+ mark_bitmap_end(EXT3_INODES_PER_GROUP(sb), EXT3_BLOCKS_PER_GROUP(sb),
+ bh->b_data);
+ ext3_journal_dirty_metadata(handle, bh);
+exit_bh:
+ brelse(bh);
+
+exit_journal:
+ unlock_super(sb);
+ if ((err2 = ext3_journal_stop(handle)) && !err)
+ err = err2;
+
+ return err;
+}
+
+/*
+ * Iterate through the groups which hold BACKUP superblock/GDT copies in an
+ * ext3 filesystem. The counters should be initialized to 1, 5, and 7 before
+ * calling this for the first time. In a sparse filesystem it will be the
+ * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
+ * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
+ */
+unsigned ext3_list_backups(struct super_block *sb, unsigned *three,
+ unsigned *five, unsigned *seven)
+{
+ unsigned *min = three;
+ int mult = 3;
+ unsigned ret;
+
+ if (!EXT3_HAS_RO_COMPAT_FEATURE(sb,
+ EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
+ ret = *min;
+ *min += 1;
+ return ret;
+ }
+
+ if (*five < *min) {
+ min = five;
+ mult = 5;
+ }
+ if (*seven < *min) {
+ min = seven;
+ mult = 7;
+ }
+
+ ret = *min;
+ *min *= mult;
+
+ return ret;
+}
+
+/*
+ * Check that all of the backup GDT blocks are held in the primary GDT block.
+ * It is assumed that they are stored in group order. Returns the number of
+ * groups in current filesystem that have BACKUPS, or -ve error code.
+ */
+static int verify_reserved_gdb(struct super_block *sb,
+ struct buffer_head *primary)
+{
+ const unsigned long blk = primary->b_blocknr;
+ const unsigned long end = EXT3_SB(sb)->s_groups_count;
+ unsigned three = 1;
+ unsigned five = 5;
+ unsigned seven = 7;
+ unsigned grp;
+ __u32 *p = (__u32 *)primary->b_data;
+ int gdbackups = 0;
+
+ while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) {
+ if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){
+ ext3_warning(sb, __FUNCTION__,
+ "reserved GDT %ld missing grp %d (%ld)\n",
+ blk, grp,
+ grp * EXT3_BLOCKS_PER_GROUP(sb) + blk);
+ return -EINVAL;
+ }
+ if (++gdbackups > EXT3_ADDR_PER_BLOCK(sb))
+ return -EFBIG;
+ }
+
+ return gdbackups;
+}
+
+/*
+ * Called when we need to bring a reserved group descriptor table block into
+ * use from the resize inode. The primary copy of the new GDT block currently
+ * is an indirect block (under the double indirect block in the resize inode).
+ * The new backup GDT blocks will be stored as leaf blocks in this indirect
+ * block, in group order. Even though we know all the block numbers we need,
+ * we check to ensure that the resize inode has actually reserved these blocks.
+ *
+ * Don't need to update the block bitmaps because the blocks are still in use.
+ *
+ * We get all of the error cases out of the way, so that we are sure to not
+ * fail once we start modifying the data on disk, because JBD has no rollback.
+ */
+static int add_new_gdb(handle_t *handle, struct inode *inode,
+ struct ext3_new_group_data *input,
+ struct buffer_head **primary)
+{
+ struct super_block *sb = inode->i_sb;
+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+ unsigned long gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb);
+ unsigned long gdb_off = input->group % EXT3_DESC_PER_BLOCK(sb);
+ unsigned long gdblock = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
+ struct buffer_head **o_group_desc, **n_group_desc;
+ struct buffer_head *dind;
+ int gdbackups;
+ struct ext3_iloc iloc;
+ __u32 *data;
+ int err;
+
+ if (test_opt(sb, DEBUG))
+ printk("EXT3-fs: ext3_add_new_gdb: adding group block %lu\n",
+ gdb_num);
+
+ /*
+ * If we are not using the primary superblock/GDT copy don't resize,
+ * because the user tools have no way of handling this. Probably a
+ * bad time to do it anyways.
+ */
+ if (EXT3_SB(sb)->s_sbh->b_blocknr !=
+ le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block)) {
+ ext3_warning(sb, __FUNCTION__,
+ "won't resize using backup superblock at %lu\n",
+ EXT3_SB(sb)->s_sbh->b_blocknr);
+ return -EPERM;
+ }
+
+ *primary = sb_bread(sb, gdblock);
+ if (!*primary)
+ return -EIO;
+
+ if ((gdbackups = verify_reserved_gdb(sb, *primary)) < 0) {
+ err = gdbackups;
+ goto exit_bh;
+ }
+
+ data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK;
+ dind = sb_bread(sb, le32_to_cpu(*data));
+ if (!dind) {
+ err = -EIO;
+ goto exit_bh;
+ }
+
+ data = (__u32 *)dind->b_data;
+ if (le32_to_cpu(data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)]) != gdblock) {
+ ext3_warning(sb, __FUNCTION__,
+ "new group %u GDT block %lu not reserved\n",
+ input->group, gdblock);
+ err = -EINVAL;
+ goto exit_dind;
+ }
+
+ if ((err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh)))
+ goto exit_dind;
+
+ if ((err = ext3_journal_get_write_access(handle, *primary)))
+ goto exit_sbh;
+
+ if ((err = ext3_journal_get_write_access(handle, dind)))
+ goto exit_primary;
+
+ /* ext3_reserve_inode_write() gets a reference on the iloc */
+ if ((err = ext3_reserve_inode_write(handle, inode, &iloc)))
+ goto exit_dindj;
+
+ n_group_desc = (struct buffer_head **)kmalloc((gdb_num + 1) *
+ sizeof(struct buffer_head *), GFP_KERNEL);
+ if (!n_group_desc) {
+ err = -ENOMEM;
+ ext3_warning (sb, __FUNCTION__,
+ "not enough memory for %lu groups", gdb_num + 1);
+ goto exit_inode;
+ }
+
+ /*
+ * Finally, we have all of the possible failures behind us...
+ *
+ * Remove new GDT block from inode double-indirect block and clear out
+ * the new GDT block for use (which also "frees" the backup GDT blocks
+ * from the reserved inode). We don't need to change the bitmaps for
+ * these blocks, because they are marked as in-use from being in the
+ * reserved inode, and will become GDT blocks (primary and backup).
+ */
+ /*
+ printk("removing block %d = %ld from dindir %ld[%ld]\n",
+ ((__u32 *)(dind->b_data))[gdb_off], gdblock, dind->b_blocknr,
+ gdb_num); */
+ data[gdb_num % EXT3_ADDR_PER_BLOCK(sb)] = 0;
+ ext3_journal_dirty_metadata(handle, dind);
+ brelse(dind);
+ inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9;
+ ext3_mark_iloc_dirty(handle, inode, &iloc);
+ memset((*primary)->b_data, 0, sb->s_blocksize);
+ ext3_journal_dirty_metadata(handle, *primary);
+
+ o_group_desc = EXT3_SB(sb)->s_group_desc;
+ memcpy(n_group_desc, o_group_desc,
+ EXT3_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
+ n_group_desc[gdb_num] = *primary;
+ EXT3_SB(sb)->s_group_desc = n_group_desc;
+ EXT3_SB(sb)->s_gdb_count++;
+ kfree(o_group_desc);
+
+ es->s_reserved_gdt_blocks =
+ cpu_to_le16(le16_to_cpu(es->s_reserved_gdt_blocks) - 1);
+ ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
+
+ return 0;
+
+exit_inode:
+ //ext3_journal_release_buffer(handle, iloc.bh);
+ brelse(iloc.bh);
+exit_dindj:
+ //ext3_journal_release_buffer(handle, dind);
+exit_primary:
+ //ext3_journal_release_buffer(handle, *primary);
+exit_sbh:
+ //ext3_journal_release_buffer(handle, *primary);
+exit_dind:
+ brelse(dind);
+exit_bh:
+ brelse(*primary);
+
+ ext3_debug("leaving with error %d\n", err);
+ return err;
+}
+
+/*
+ * Called when we are adding a new group which has a backup copy of each of
+ * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
+ * We need to add these reserved backup GDT blocks to the resize inode, so
+ * that they are kept for future resizing and not allocated to files.
+ *
+ * Each reserved backup GDT block will go into a different indirect block.
+ * The indirect blocks are actually the primary reserved GDT blocks,
+ * so we know in advance what their block numbers are. We only get the
+ * double-indirect block to verify it is pointing to the primary reserved
+ * GDT blocks so we don't overwrite a data block by accident. The reserved
+ * backup GDT blocks are stored in their reserved primary GDT block.
+ */
+static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
+ struct ext3_new_group_data *input)
+{
+ struct super_block *sb = inode->i_sb;
+ int reserved_gdb =le16_to_cpu(EXT3_SB(sb)->s_es->s_reserved_gdt_blocks);
+ struct buffer_head **primary;
+ struct buffer_head *dind;
+ struct ext3_iloc iloc;
+ unsigned long blk;
+ __u32 *data, *end;
+ int gdbackups = 0;
+ int res, i;
+ int err;
+
+ primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_KERNEL);
+ if (!primary)
+ return -ENOMEM;
+
+ data = EXT3_I(inode)->i_data + EXT3_DIND_BLOCK;
+ dind = sb_bread(sb, le32_to_cpu(*data));
+ if (!dind) {
+ err = -EIO;
+ goto exit_free;
+ }
+
+ blk = EXT3_SB(sb)->s_sbh->b_blocknr + 1 + EXT3_SB(sb)->s_gdb_count;
+ data = (__u32 *)dind->b_data + EXT3_SB(sb)->s_gdb_count;
+ end = (__u32 *)dind->b_data + EXT3_ADDR_PER_BLOCK(sb);
+
+ /* Get each reserved primary GDT block and verify it holds backups */
+ for (res = 0; res < reserved_gdb; res++, blk++) {
+ if (le32_to_cpu(*data) != blk) {
+ ext3_warning(sb, __FUNCTION__,
+ "reserved block %lu not at offset %ld\n",
+ blk, (long)(data - (__u32 *)dind->b_data));
+ err = -EINVAL;
+ goto exit_bh;
+ }
+ primary[res] = sb_bread(sb, blk);
+ if (!primary[res]) {
+ err = -EIO;
+ goto exit_bh;
+ }
+ if ((gdbackups = verify_reserved_gdb(sb, primary[res])) < 0) {
+ brelse(primary[res]);
+ err = gdbackups;
+ goto exit_bh;
+ }
+ if (++data >= end)
+ data = (__u32 *)dind->b_data;
+ }
+
+ for (i = 0; i < reserved_gdb; i++) {
+ if ((err = ext3_journal_get_write_access(handle, primary[i]))) {
+ /*
+ int j;
+ for (j = 0; j < i; j++)
+ ext3_journal_release_buffer(handle, primary[j]);
+ */
+ goto exit_bh;
+ }
+ }
+
+ if ((err = ext3_reserve_inode_write(handle, inode, &iloc)))
+ goto exit_bh;
+
+ /*
+ * Finally we can add each of the reserved backup GDT blocks from
+ * the new group to its reserved primary GDT block.
+ */
+ blk = input->group * EXT3_BLOCKS_PER_GROUP(sb);
+ for (i = 0; i < reserved_gdb; i++) {
+ int err2;
+ data = (__u32 *)primary[i]->b_data;
+ /* printk("reserving backup %lu[%u] = %lu\n",
+ primary[i]->b_blocknr, gdbackups,
+ blk + primary[i]->b_blocknr); */
+ data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
+ err2 = ext3_journal_dirty_metadata(handle, primary[i]);
+ if (!err)
+ err = err2;
+ }
+ inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9;
+ ext3_mark_iloc_dirty(handle, inode, &iloc);
+
+exit_bh:
+ while (--res >= 0)
+ brelse(primary[res]);
+ brelse(dind);
+
+exit_free:
+ kfree(primary);
+
+ return err;
+}
+
+/*
+ * Update the backup copies of the ext3 metadata. These don't need to be part
+ * of the main resize transaction, because e2fsck will re-write them if there
+ * is a problem (basically only OOM will cause a problem). However, we
+ * _should_ update the backups if possible, in case the primary gets trashed
+ * for some reason and we need to run e2fsck from a backup superblock. The
+ * important part is that the new block and inode counts are in the backup
+ * superblocks, and the location of the new group metadata in the GDT backups.
+ *
+ * We do not need lock_super() for this, because these blocks are not
+ * otherwise touched by the filesystem code when it is mounted. We don't
+ * need to worry about last changing from sbi->s_groups_count, because the
+ * worst that can happen is that we do not copy the full number of backups
+ * at this time. The resize which changed s_groups_count will backup again.
+ *
+ * We only pass inode because of the ext3 journal wrappers.
+ */
+static void update_backups(struct super_block *sb, struct inode *inode,
+ int blk_off, char *data, int size)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ const unsigned long last = sbi->s_groups_count;
+ const int bpg = EXT3_BLOCKS_PER_GROUP(sb);
+ unsigned three = 1;
+ unsigned five = 5;
+ unsigned seven = 7;
+ unsigned group;
+ int rest = sb->s_blocksize - size;
+ handle_t *handle;
+ int err = 0, err2;
+
+ handle = ext3_journal_start(inode, EXT3_MAX_TRANS_DATA);
+ if (IS_ERR(handle)) {
+ group = 1;
+ err = PTR_ERR(handle);
+ goto exit_err;
+ }
+
+ while ((group = ext3_list_backups(sb, &three, &five, &seven)) < last) {
+ struct buffer_head *bh;
+
+ /* Out of journal space, and can't get more - abort - so sad */
+ if (handle->h_buffer_credits == 0 &&
+ ext3_journal_extend(handle, EXT3_MAX_TRANS_DATA) &&
+ (err = ext3_journal_restart(handle, EXT3_MAX_TRANS_DATA)))
+ break;
+
+ bh = sb_getblk(sb, group * bpg + blk_off);
+ set_buffer_uptodate(bh);
+ ext3_debug(sb, __FUNCTION__, "update metadata backup %#04lx\n",
+ bh->b_blocknr);
+ if ((err = ext3_journal_get_write_access(handle, bh)))
+ break;
+ memcpy(bh->b_data, data, size);
+ if (rest)
+ memset(bh->b_data + size, 0, rest);
+ ext3_journal_dirty_metadata(handle, bh);
+ brelse(bh);
+ }
+ if ((err2 = ext3_journal_stop(handle)) && !err)
+ err = err2;
+
+ /*
+ * Ugh! Need to have e2fsck write the backup copies. It is too
+ * late to revert the resize, we shouldn't fail just because of
+ * the backup copies (they are only needed in case of corruption).
+ *
+ * However, if we got here we have a journal problem too, so we
+ * can't really start a transaction to mark the superblock.
+ * Chicken out and just set the flag on the hope it will be written
+ * to disk, and if not - we will simply wait until next fsck.
+ */
+exit_err:
+ if (err) {
+ ext3_warning(sb, __FUNCTION__,
+ "can't update backup for group %d (err %d), "
+ "forcing fsck on next reboot\n", group, err);
+ sbi->s_mount_state &= ~EXT3_VALID_FS;
+ sbi->s_es->s_state &= ~cpu_to_le16(EXT3_VALID_FS);
+ mark_buffer_dirty(sbi->s_sbh);
+ }
+}
+
+/* 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
+ * write the data to disk.
+ *
+ * If we are on a GDT block boundary, we need to get the reserved GDT block.
+ * Otherwise, we may need to add backup GDT blocks for a sparse group.
+ *
+ * We only need to hold the superblock lock while we are actually adding
+ * in the new group's counts to the superblock. Prior to that we have
+ * not really "added" the group at all. We re-check that we are still
+ * adding in the last group in case things have changed since verifying.
+ */
+int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ int reserved_gdb = ext3_bg_has_super(sb, input->group) ?
+ le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
+ struct buffer_head *primary = NULL;
+ struct ext3_group_desc *gdp;
+ struct inode *inode = NULL;
+ struct inode bogus;
+ handle_t *handle;
+ int gdb_off, gdb_num;
+ int err, err2;
+
+ gdb_num = input->group / EXT3_DESC_PER_BLOCK(sb);
+ gdb_off = input->group % EXT3_DESC_PER_BLOCK(sb);
+
+ if (gdb_off == 0 && !EXT3_HAS_RO_COMPAT_FEATURE(sb,
+ EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
+ ext3_warning(sb, __FUNCTION__,
+ "Can't resize non-sparse filesystem further\n");
+ return -EPERM;
+ }
+
+ if (reserved_gdb || gdb_off == 0) {
+ if (!EXT3_HAS_COMPAT_FEATURE(sb,
+ EXT3_FEATURE_COMPAT_RESIZE_INODE)){
+ ext3_warning(sb, __FUNCTION__,
+ "No reserved GDT blocks, can't resize\n");
+ return -EPERM;
+ }
+ inode = iget(sb, EXT3_RESIZE_INO);
+ if (!inode || is_bad_inode(inode)) {
+ ext3_warning(sb, __FUNCTION__,
+ "Error opening resize inode\n");
+ iput(inode);
+ return -ENOENT;
+ }
+ } else {
+ /* Used only for ext3 journal wrapper functions to get sb */
+ inode = &bogus;
+ bogus.i_sb = sb;
+ }
+
+ if ((err = verify_group_input(sb, input)))
+ goto exit_put;
+
+ if ((err = setup_new_group_blocks(sb, inode, input)))
+ goto exit_put;
+
+ /*
+ * We will always be modifying at least the superblock and a GDT
+ * block. If we are adding a group past the last current GDT block,
+ * we will also modify the inode and the dindirect block. If we
+ * are adding a group with superblock/GDT backups we will also
+ * modify each of the reserved GDT dindirect blocks.
+ */
+ handle = ext3_journal_start(inode, ext3_bg_has_super(sb, input->group) ?
+ 3 + reserved_gdb : 4);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto exit_put;
+ }
+
+ lock_super(sb);
+ if (input->group != EXT3_SB(sb)->s_groups_count) {
+ ext3_warning(sb, __FUNCTION__,
+ "multiple resizers run on filesystem!\n");
+ goto exit_journal;
+ }
+
+ if ((err = ext3_journal_get_write_access(handle, sbi->s_sbh)))
+ goto exit_journal;
+
+ /*
+ * 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) {
+ primary = sbi->s_group_desc[gdb_num];
+ if ((err = ext3_journal_get_write_access(handle, primary)))
+ goto exit_journal;
+
+ if (reserved_gdb && ext3_bg_num_gdb(sb, input->group) &&
+ (err = reserve_backup_gdb(handle, inode, input)))
+ goto exit_journal;
+ } else if ((err = add_new_gdb(handle, inode, input, &primary)))
+ goto exit_journal;
+
+ /* Finally update group descriptor block for new group */
+ gdp = (struct ext3_group_desc *)primary->b_data + gdb_off;
+
+ gdp->bg_block_bitmap = cpu_to_le32(input->block_bitmap);
+ gdp->bg_inode_bitmap = cpu_to_le32(input->inode_bitmap);
+ gdp->bg_inode_table = cpu_to_le32(input->inode_table);
+ gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count);
+ gdp->bg_free_inodes_count = cpu_to_le16(EXT3_INODES_PER_GROUP(sb));
+
+ EXT3_SB(sb)->s_groups_count++;
+ ext3_journal_dirty_metadata(handle, primary);
+
+ /* Update superblock with new block counts */
+ es->s_blocks_count = cpu_to_le32(le32_to_cpu(es->s_blocks_count) +
+ input->blocks_count);
+ es->s_free_blocks_count =
+ cpu_to_le32(le32_to_cpu(es->s_free_blocks_count) +
+ input->free_blocks_count);
+ es->s_r_blocks_count = cpu_to_le32(le32_to_cpu(es->s_r_blocks_count) +
+ input->reserved_blocks);
+ es->s_inodes_count = cpu_to_le32(le32_to_cpu(es->s_inodes_count) +
+ EXT3_INODES_PER_GROUP(sb));
+ es->s_free_inodes_count =
+ cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) +
+ EXT3_INODES_PER_GROUP(sb));
+ ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
+ sb->s_dirt = 1;
+
+exit_journal:
+ unlock_super(sb);
+ handle->h_sync = 1;
+ if ((err2 = ext3_journal_stop(handle)) && !err)
+ err = err2;
+ if (!err) {
+ update_backups(sb, inode, sbi->s_sbh->b_blocknr, (char *)es,
+ sizeof(struct ext3_super_block));
+ update_backups(sb, inode, primary->b_blocknr, primary->b_data,
+ primary->b_size);
+ }
+exit_put:
+ if (inode != &bogus)
+ iput(inode);
+ return err;
+} /* ext3_group_add */
+
+/* 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
+ * existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
+ * for emergencies (because it has no dependencies on reserved blocks).
+ *
+ * If we _really_ wanted, we could use default values to call ext3_group_add()
+ * allow the "remount" trick to work for arbitrary resizing, assuming enough
+ * GDT blocks are reserved to grow to the desired size.
+ */
+int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
+ unsigned long n_blocks_count)
+{
+ unsigned long o_blocks_count;
+ unsigned long o_groups_count;
+ unsigned long last;
+ int add;
+ struct inode *inode;
+ struct buffer_head * bh;
+ handle_t *handle;
+ int err;
+
+ o_blocks_count = le32_to_cpu(es->s_blocks_count);
+ o_groups_count = EXT3_SB(sb)->s_groups_count;
+
+ if (test_opt(sb, DEBUG))
+ printk("EXT3-fs: extending last group from %lu to %lu blocks\n",
+ o_blocks_count, n_blocks_count);
+
+ if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
+ return 0;
+
+ if (n_blocks_count < o_blocks_count) {
+ ext3_warning(sb, __FUNCTION__,
+ "can't shrink FS - resize aborted");
+ return -EBUSY;
+ }
+
+ /* Handle the remaining blocks in the last group only. */
+ last = (o_blocks_count - le32_to_cpu(es->s_first_data_block)) %
+ EXT3_BLOCKS_PER_GROUP(sb);
+
+ if (last == 0) {
+ ext3_warning(sb, __FUNCTION__,
+ "need to use ext2online to resize further\n");
+ return -EPERM;
+ }
+
+ add = EXT3_BLOCKS_PER_GROUP(sb) - last;
+
+ if (o_blocks_count + add > n_blocks_count)
+ add = n_blocks_count - o_blocks_count;
+
+ if (o_blocks_count + add < n_blocks_count)
+ ext3_warning(sb, __FUNCTION__,
+ "will only finish group (%lu blocks, %u new)",
+ o_blocks_count + add, add);
+
+ /* See if the device is actually as big as what was requested */
+ bh = sb_bread(sb, o_blocks_count + add -1);
+ if (!bh) {
+ ext3_warning(sb, __FUNCTION__,
+ "can't read last block, resize aborted");
+ return -ENOSPC;
+ }
+ brelse(bh);
+
+ /* Get a bogus inode to "free" the new blocks in this group. */
+ if (!(inode = new_inode(sb))) {
+ ext3_warning(sb, __FUNCTION__,
+ "error getting dummy resize inode");
+ return -ENOMEM;
+ }
+ inode->i_ino = 0;
+
+ EXT3_I(inode)->i_state = EXT3_STATE_RESIZE;
+
+ /* We will update the superblock, one block bitmap, and
+ * one group descriptor via ext3_free_blocks().
+ */
+ handle = ext3_journal_start(inode, 3);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ ext3_warning(sb, __FUNCTION__, "error %d on journal start",err);
+ goto exit_put;
+ }
+
+ lock_super(sb);
+ if (o_blocks_count != le32_to_cpu(es->s_blocks_count)) {
+ ext3_warning(sb, __FUNCTION__,
+ "multiple resizers run on filesystem!\n");
+ err = -EBUSY;
+ goto exit_put;
+ }
+
+ if ((err = ext3_journal_get_write_access(handle,
+ EXT3_SB(sb)->s_sbh))) {
+ ext3_warning(sb, __FUNCTION__,
+ "error %d on journal write access", err);
+ unlock_super(sb);
+ ext3_journal_stop(handle);
+ goto exit_put;
+ }
+ es->s_blocks_count = cpu_to_le32(o_blocks_count + add);
+ ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
+ sb->s_dirt = 1;
+ unlock_super(sb);
+ ext3_debug("freeing blocks %ld through %ld\n", o_blocks_count,
+ o_blocks_count + add);
+ ext3_free_blocks(handle, inode, o_blocks_count, add);
+ ext3_debug("freed blocks %ld through %ld\n", o_blocks_count,
+ o_blocks_count + add);
+ if ((err = ext3_journal_stop(handle)))
+ goto exit_put;
+ if (test_opt(sb, DEBUG))
+ printk("EXT3-fs: extended group to %u blocks\n",
+ le32_to_cpu(es->s_blocks_count));
+ update_backups(sb, inode, EXT3_SB(sb)->s_sbh->b_blocknr, (char *)es,
+ sizeof(struct ext3_super_block));
+exit_put:
+ iput(inode);
+
+ return err;
+} /* ext3_group_extend */
git://git.onelab.eu / linux-2.6.git / blobdiff