blob: 011ba6670d990285f6f61b56ea3fb8b421b70e59 [file] [log] [blame]
* 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);
* 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)
return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed;