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fuse: Switch to using async direct IO for FOPEN_DIRECT_IO 

Switch to using the async directo IO code path in fuse_direct_read_iter()
and fuse_direct_write_iter().  This is especially important in connection
with loop devices with direct IO enabled as loop assumes async direct io is
actually async.

Signed-off-by: Martin Raiber <martin@urbackup.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Martin Raiber 2018-10-27 16:48:48 +00:00 committed by Miklos Szeredi
parent 75126f5504
commit 23c94e1cdc
1 changed files with 26 additions and 4 deletions
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30
fs/fuse/file.c
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@ -1436,10 +1436,26 @@ static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
return res;
}
static ssize_t fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb);
return __fuse_direct_read(&io, to, &iocb->ki_pos);
ssize_t res;
if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) {
struct file *file = iocb->ki_filp;
if (is_bad_inode(file_inode(file)))
return -EIO;
res = fuse_direct_IO(iocb, to);
} else {
struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb);
res = __fuse_direct_read(&io, to, &iocb->ki_pos);
}
return res;
}
static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
@ -1454,8 +1470,14 @@ static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
/* Don't allow parallel writes to the same file */
inode_lock(inode);
res = generic_write_checks(iocb, from);
if (res > 0)
res = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE);
if (res > 0) {
if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) {
res = fuse_direct_IO(iocb, from);
} else {
res = fuse_direct_io(&io, from, &iocb->ki_pos,
FUSE_DIO_WRITE);
}
}
fuse_invalidate_attr(inode);
if (res > 0)
fuse_write_update_size(inode, iocb->ki_pos);