fs/affs/file.c: add support to O_DIRECT
Based on ext2_direct_IO Tested with O_DIRECT file open and sysbench/mariadb with 1% written queries improvement (update_non_index test) on a volume created with mkaffs. Signed-off-by: Fabian Frederick <fabf@skynet.be> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -12,6 +12,7 @@
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* affs regular file handling primitives
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*/
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#include <linux/aio.h>
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#include "affs.h"
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#if PAGE_SIZE < 4096
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@ -392,6 +393,22 @@ static void affs_write_failed(struct address_space *mapping, loff_t to)
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}
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}
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static ssize_t
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affs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
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loff_t offset)
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{
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struct file *file = iocb->ki_filp;
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struct address_space *mapping = file->f_mapping;
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struct inode *inode = mapping->host;
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size_t count = iov_iter_count(iter);
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ssize_t ret;
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ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, affs_get_block);
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if (ret < 0 && (rw & WRITE))
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affs_write_failed(mapping, offset + count);
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return ret;
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}
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static int affs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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@ -418,6 +435,7 @@ const struct address_space_operations affs_aops = {
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.writepage = affs_writepage,
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.write_begin = affs_write_begin,
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.write_end = generic_write_end,
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.direct_IO = affs_direct_IO,
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.bmap = _affs_bmap
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};
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