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authorChristoph Hellwig <hch@lst.de>2015-02-02 14:59:43 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2015-03-13 12:10:15 -0400
commit9d5722b7777e64de2d932f46cfee7765fdcc60d6 (patch)
treeb0f1e84779f0b6d6ead9bc2adcb700ddc1ef2efe /fs/fuse/file.c
parent66ee59af630fd8d5f4f56fb28162857e629aa0ab (diff)
downloadlinux-9d5722b7777e64de2d932f46cfee7765fdcc60d6.tar.bz2
fuse: handle synchronous iocbs internally
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>
Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r--fs/fuse/file.c51
1 files changed, 31 insertions, 20 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c01ec3bdcfd8..f81d83eb9758 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -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);