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ext4: create EXT4_MAX_BLOCKS() macro

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Create a macro to calculate length + offset -> maximum blocks
This adds more readability.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Fabian Frederick 2016-09-15 11:55:01 -04:00 committed by Theodore Ts'o
parent c3fe493ccd
commit 518eaa6387
3 changed files with 7 additions and 14 deletions
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3
fs/ext4/ext4.h
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@ -262,6 +262,9 @@ struct ext4_io_submit {
(s)->s_first_ino)
#endif
#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
blkbits))
/* Translate a block number to a cluster number */
#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)

15
fs/ext4/extents.c
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@ -4961,13 +4961,8 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
trace_ext4_fallocate_enter(inode, offset, len, mode);
lblk = offset >> blkbits;
/*
* We can't just convert len to max_blocks because
* If blocksize = 4096 offset = 3072 and len = 2048
*/
max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
- lblk;
max_blocks = EXT4_MAX_BLOCKS(len, offset, blkbits);
flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
if (mode & FALLOC_FL_KEEP_SIZE)
flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
@ -5030,12 +5025,8 @@ int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
unsigned int credits, blkbits = inode->i_blkbits;
map.m_lblk = offset >> blkbits;
/*
* We can't just convert len to max_blocks because
* If blocksize = 4096 offset = 3072 and len = 2048
*/
max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) -
map.m_lblk);
max_blocks = EXT4_MAX_BLOCKS(len, offset, blkbits);
/*
* This is somewhat ugly but the idea is clear: When transaction is
* reserved, everything goes into it. Otherwise we rather start several

3
fs/ext4/file.c
View File

@ -144,8 +144,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
int err, len;
map.m_lblk = pos >> blkbits;
map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
- map.m_lblk;
map.m_len = EXT4_MAX_BLOCKS(length, pos, blkbits);
len = map.m_len;
err = ext4_map_blocks(NULL, inode, &map, 0);