Release 4.15 fs/ext4/truncate.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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);
	ext4_truncate(inode);
	up_write(&EXT4_I(inode)->i_mmap_sem);
}

Contributors
Person
Tokens
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Commits
CommitProp
Theodore Y. Ts'o
28
56.00%
1
50.00%
Jan Kara
22
44.00%
1
50.00%
Total
50
100.00%
2
100.00%

/*
 * 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;
}

Contributors
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Tokens
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Commits
CommitProp
Theodore Y. Ts'o
64
100.00%
1
100.00%
Total
64
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Theodore Y. Ts'o
95
80.51%
1
33.33%
Jan Kara
22
18.64%
1
33.33%
Greg Kroah-Hartman
1
0.85%
1
33.33%
Total
118
100.00%
3
100.00%
Directory: fs/ext4

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