| * 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) |
| down_write(&EXT4_I(inode)->i_mmap_sem); |
| truncate_inode_pages(inode->i_mapping, inode->i_size); |
| up_write(&EXT4_I(inode)->i_mmap_sem); |
| * Work out how many blocks we need to proceed with the next chunk of a |
| static inline unsigned long ext4_blocks_for_truncate(struct inode *inode) |
| 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. */ |
| /* But we need to bound the transaction so we don't overflow the |
| if (needed > EXT4_MAX_TRANS_DATA) |
| needed = EXT4_MAX_TRANS_DATA; |
| return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed; |