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ext4: allow unlocked direct IO when pages are cached

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Currently we do not allow unlocked (meaning without inode_lock) direct
IO when the file has any pages cached. This check is not needed anymore
as we keep inode lock until ext4_direct_IO_write() and thus can happily
writeback and evict any pages conflicting with current direct IO write.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2016-09-30 01:55:32 -04:00 committed by Theodore Ts'o
parent 9a200d075e
commit 4b0524aae0
1 changed files with 1 additions and 2 deletions
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3
fs/ext4/file.c
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@ -91,7 +91,6 @@ ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
static ssize_t
ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(iocb->ki_filp);
struct blk_plug plug;
int o_direct = iocb->ki_flags & IOCB_DIRECT;
@ -138,7 +137,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
/* check whether we do a DIO overwrite or not */
if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
!file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
pos + length <= i_size_read(inode)) {
struct ext4_map_blocks map;
unsigned int blkbits = inode->i_blkbits;
int err, len;