truncate.h

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/*
 * linux/fs/ext4/truncate.h
 *
 * Common inline functions needed for truncate support
 */

/*
 * Truncate blocks that were not used by write. We have to truncate the
 * pagecache as well so that corresponding buffers get properly unmapped.
 */
static inline void ext4_truncate_failed_write(struct inode *inode)
{
    truncate_inode_pages(inode->i_mapping, inode->i_size);
    ext4_truncate(inode);
}

/*
 * Work out how many blocks we need to proceed with the next chunk of a
 * truncate transaction.
 */
static inline unsigned long ext4_blocks_for_truncate(struct inode *inode)
{
    ext4_lblk_t needed;

    needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9);

    /* Give ourselves just enough room to cope with inodes in which
     * i_blocks is corrupt: we've seen disk corruptions in the past
     * which resulted in random data in an inode which looked enough
     * like a regular file for ext4 to try to delete it.  Things
     * will go a bit crazy if that happens, but at least we should
     * try not to panic the whole kernel. */
    if (needed < 2)
        needed = 2;

    /* But we need to bound the transaction so we don't overflow the
     * journal. */
    if (needed > EXT4_MAX_TRANS_DATA)
        needed = EXT4_MAX_TRANS_DATA;

    return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed;
}