ext4: allow unlocked direct IO when pages are cached

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>

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 34acda7..25342c8 100644 (file)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -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;