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udf: avoid redundant memcpy when writing data in ICB

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Valid data within i_size in page cache will be copied to ICB cache when we
writeback the page by invoking udf_adinicb_writepage, so the copy in
udf_adinicb_write_end is redundant.

After we remove the copy, it's better to use simple_write_end directly in
udf_adinicb_aops instead of udf_adinicb_write_end.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Chao Yu 2014-07-15 09:38:51 +08:00 committed by Jan Kara
parent c7ff48212d
commit 3f1be4f9c9
1 changed files with 1 additions and 19 deletions
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20
fs/udf/file.c
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@ -100,24 +100,6 @@ static int udf_adinicb_write_begin(struct file *file,
return 0;
}
static int udf_adinicb_write_end(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
char *kaddr;
struct udf_inode_info *iinfo = UDF_I(inode);
kaddr = kmap_atomic(page);
memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
kaddr + offset, copied);
kunmap_atomic(kaddr);
return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
}
static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
struct iov_iter *iter,
loff_t offset)
@ -130,7 +112,7 @@ const struct address_space_operations udf_adinicb_aops = {
.readpage = udf_adinicb_readpage,
.writepage = udf_adinicb_writepage,
.write_begin = udf_adinicb_write_begin,
.write_end = udf_adinicb_write_end,
.write_end = simple_write_end,
.direct_IO = udf_adinicb_direct_IO,
};