resize.c (19c5246d251640ac76daa4d34165af78c64b1454) resize.c (d89651c8e222b2d2797bf66d4eb7064459f4f4f4)
1/*
2 * linux/fs/ext4/resize.c
3 *
4 * Support for resizing an ext4 filesystem while it is mounted.
5 *
6 * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
7 *
8 * This could probably be made into a module, because it is not often in use.

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1790 */
1791int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1792 ext4_fsblk_t n_blocks_count)
1793{
1794 ext4_fsblk_t o_blocks_count;
1795 ext4_grpblk_t last;
1796 ext4_grpblk_t add;
1797 struct buffer_head *bh;
1/*
2 * linux/fs/ext4/resize.c
3 *
4 * Support for resizing an ext4 filesystem while it is mounted.
5 *
6 * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
7 *
8 * This could probably be made into a module, because it is not often in use.

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1790 */
1791int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1792 ext4_fsblk_t n_blocks_count)
1793{
1794 ext4_fsblk_t o_blocks_count;
1795 ext4_grpblk_t last;
1796 ext4_grpblk_t add;
1797 struct buffer_head *bh;
1798 handle_t *handle;
1799 int err, err2;
1798 int err;
1800 ext4_group_t group;
1801
1802 o_blocks_count = ext4_blocks_count(es);
1803
1804 if (test_opt(sb, DEBUG))
1805 printk(KERN_DEBUG "EXT4-fs: extending last group from %llu to %llu blocks\n",
1806 o_blocks_count, n_blocks_count);
1807

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1847 /* See if the device is actually as big as what was requested */
1848 bh = sb_bread(sb, o_blocks_count + add - 1);
1849 if (!bh) {
1850 ext4_warning(sb, "can't read last block, resize aborted");
1851 return -ENOSPC;
1852 }
1853 brelse(bh);
1854
1799 ext4_group_t group;
1800
1801 o_blocks_count = ext4_blocks_count(es);
1802
1803 if (test_opt(sb, DEBUG))
1804 printk(KERN_DEBUG "EXT4-fs: extending last group from %llu to %llu blocks\n",
1805 o_blocks_count, n_blocks_count);
1806

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1846 /* See if the device is actually as big as what was requested */
1847 bh = sb_bread(sb, o_blocks_count + add - 1);
1848 if (!bh) {
1849 ext4_warning(sb, "can't read last block, resize aborted");
1850 return -ENOSPC;
1851 }
1852 brelse(bh);
1853
1855 /* We will update the superblock, one block bitmap, and
1856 * one group descriptor via ext4_free_blocks().
1857 */
1858 handle = ext4_journal_start_sb(sb, 3);
1859 if (IS_ERR(handle)) {
1860 err = PTR_ERR(handle);
1861 ext4_warning(sb, "error %d on journal start", err);
1862 goto exit_put;
1863 }
1864
1865 if ((err = ext4_journal_get_write_access(handle,
1866 EXT4_SB(sb)->s_sbh))) {
1867 ext4_warning(sb, "error %d on journal write access", err);
1868 ext4_journal_stop(handle);
1869 goto exit_put;
1870 }
1871 ext4_blocks_count_set(es, o_blocks_count + add);
1872 ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1873 o_blocks_count + add);
1874 /* We add the blocks to the bitmap and set the group need init bit */
1875 err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1876 ext4_handle_dirty_super(handle, sb);
1877 ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1878 o_blocks_count + add);
1879 err2 = ext4_journal_stop(handle);
1880 if (!err && err2)
1881 err = err2;
1882
1883 if (err)
1884 goto exit_put;
1885
1886 if (test_opt(sb, DEBUG))
1887 printk(KERN_DEBUG "EXT4-fs: extended group to %llu blocks\n",
1888 ext4_blocks_count(es));
1889 update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es,
1890 sizeof(struct ext4_super_block));
1891exit_put:
1854 err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1892 return err;
1893} /* ext4_group_extend */
1894
1895/*
1896 * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1897 *
1898 * @sb: super block of the fs to be resized
1899 * @n_blocks_count: the number of blocks resides in the resized fs

--- 107 unchanged lines hidden --- 		1855 return err;
1856} /* ext4_group_extend */
1857
1858/*
1859 * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1860 *
1861 * @sb: super block of the fs to be resized
1862 * @n_blocks_count: the number of blocks resides in the resized fs

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