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fuse: handle synchronous iocbs internally

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Based on a patch from Maxim Patlasov <MPatlasov@parallels.com>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2015-02-02 14:59:43 +01:00 committed by Al Viro
parent 66ee59af63
commit 9d5722b777
2 changed files with 32 additions and 20 deletions
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51
fs/fuse/file.c
View file

@ -528,6 +528,17 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
}
}
static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io)
{
if (io->err)
return io->err;
if (io->bytes >= 0 && io->write)
return -EIO;
return io->bytes < 0 ? io->size : io->bytes;
}
/**
* In case of short read, the caller sets 'pos' to the position of
* actual end of fuse request in IO request. Otherwise, if bytes_requested
@ -546,6 +557,7 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
*/
static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
{
bool is_sync = is_sync_kiocb(io->iocb);
int left;
spin_lock(&io->lock);
@ -555,27 +567,21 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
io->bytes = pos;
left = --io->reqs;
if (!left && is_sync)
complete(io->done);
spin_unlock(&io->lock);
if (!left) {
long res;
if (!left && !is_sync) {
ssize_t res = fuse_get_res_by_io(io);
if (io->err)
res = io->err;
else if (io->bytes >= 0 && io->write)
res = -EIO;
else {
res = io->bytes < 0 ? io->size : io->bytes;
if (res >= 0) {
struct inode *inode = file_inode(io->iocb->ki_filp);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
if (!is_sync_kiocb(io->iocb)) {
struct inode *inode = file_inode(io->iocb->ki_filp);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
fi->attr_version = ++fc->attr_version;
spin_unlock(&fc->lock);
}
spin_lock(&fc->lock);
fi->attr_version = ++fc->attr_version;
spin_unlock(&fc->lock);
}
aio_complete(io->iocb, res, 0);
@ -2801,6 +2807,7 @@ static ssize_t
fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
loff_t offset)
{
DECLARE_COMPLETION_ONSTACK(wait);
ssize_t ret = 0;
struct file *file = iocb->ki_filp;
struct fuse_file *ff = file->private_data;
@ -2852,6 +2859,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
if (!is_sync_kiocb(iocb) && (offset + count > i_size) && rw == WRITE)
io->async = false;
if (io->async && is_sync_kiocb(iocb))
io->done = &wait;
if (rw == WRITE)
ret = __fuse_direct_write(io, iter, &pos);
else
@ -2864,11 +2874,12 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
if (!is_sync_kiocb(iocb))
return -EIOCBQUEUED;
ret = wait_on_sync_kiocb(iocb);
} else {
kfree(io);
wait_for_completion(&wait);
ret = fuse_get_res_by_io(io);
}
kfree(io);
if (rw == WRITE) {
if (ret > 0)
fuse_write_update_size(inode, pos);

1
fs/fuse/fuse_i.h
View file

@ -263,6 +263,7 @@ struct fuse_io_priv {
int err;
struct kiocb *iocb;
struct file *file;
struct completion *done;
};
/**