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f5166768 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9f125d64 TT |
2 | /* |
3 | * linux/fs/ext4/truncate.h | |
4 | * | |
5 | * Common inline functions needed for truncate support | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Truncate blocks that were not used by write. We have to truncate the | |
10 | * pagecache as well so that corresponding buffers get properly unmapped. | |
11 | */ | |
12 | static inline void ext4_truncate_failed_write(struct inode *inode) | |
13 | { | |
ea3d7209 | 14 | down_write(&EXT4_I(inode)->i_mmap_sem); |
9f125d64 TT |
15 | truncate_inode_pages(inode->i_mapping, inode->i_size); |
16 | ext4_truncate(inode); | |
ea3d7209 | 17 | up_write(&EXT4_I(inode)->i_mmap_sem); |
9f125d64 TT |
18 | } |
19 | ||
20 | /* | |
21 | * Work out how many blocks we need to proceed with the next chunk of a | |
22 | * truncate transaction. | |
23 | */ | |
24 | static inline unsigned long ext4_blocks_for_truncate(struct inode *inode) | |
25 | { | |
26 | ext4_lblk_t needed; | |
27 | ||
28 | needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); | |
29 | ||
30 | /* Give ourselves just enough room to cope with inodes in which | |
31 | * i_blocks is corrupt: we've seen disk corruptions in the past | |
32 | * which resulted in random data in an inode which looked enough | |
33 | * like a regular file for ext4 to try to delete it. Things | |
34 | * will go a bit crazy if that happens, but at least we should | |
35 | * try not to panic the whole kernel. */ | |
36 | if (needed < 2) | |
37 | needed = 2; | |
38 | ||
39 | /* But we need to bound the transaction so we don't overflow the | |
40 | * journal. */ | |
41 | if (needed > EXT4_MAX_TRANS_DATA) | |
42 | needed = EXT4_MAX_TRANS_DATA; | |
43 | ||
44 | return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed; | |
45 | } | |
46 |