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| author | Fabian Frederick <fabf@skynet.be> | 2016-09-15 11:55:01 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-09-15 11:55:01 -0400 |
| commit | 518eaa6387df796d54e065e04502e800cae1df80 (patch) | |
| tree | 9b7ce844047f58763185a4a66cb7cd1f80666f51 | |
| parent | c3fe493ccdb1f443c30155150391835004014c6a (diff) | |
| download | linux-stable-518eaa6387df796d54e065e04502e800cae1df80.tar.gz linux-stable-518eaa6387df796d54e065e04502e800cae1df80.tar.bz2 linux-stable-518eaa6387df796d54e065e04502e800cae1df80.zip | |
ext4: create EXT4_MAX_BLOCKS() macro
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>
| -rw-r--r-- | fs/ext4/ext4.h | 3 | ||||
| -rw-r--r-- | fs/ext4/extents.c | 15 | ||||
| -rw-r--r-- | fs/ext4/file.c | 3 |
3 files changed, 7 insertions, 14 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 962a0444dc84..282a51b07c57 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -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) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index ef288558b869..c930a0110fb4 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -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 diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 261ac3734c58..34acda78ce25 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -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); |