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