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-rw-r--r--fs/fuse/file.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index ba1d503..8f39f7b 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1331,7 +1331,8 @@ EXPORT_SYMBOL_GPL(fuse_direct_io);
static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
const struct iovec *iov,
- unsigned long nr_segs, loff_t *ppos)
+ unsigned long nr_segs, loff_t *ppos,
+ size_t count)
{
ssize_t res;
struct file *file = io->file;
@@ -1340,8 +1341,7 @@ static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
if (is_bad_inode(inode))
return -EIO;
- res = fuse_direct_io(io, iov, nr_segs, iov_length(iov, nr_segs),
- ppos, 0);
+ res = fuse_direct_io(io, iov, nr_segs, count, ppos, 0);
fuse_invalidate_attr(inode);
@@ -1353,7 +1353,7 @@ static ssize_t fuse_direct_read(struct file *file, char __user *buf,
{
struct fuse_io_priv io = { .async = 0, .file = file };
struct iovec iov = { .iov_base = buf, .iov_len = count };
- return __fuse_direct_read(&io, &iov, 1, ppos);
+ return __fuse_direct_read(&io, &iov, 1, ppos, count);
}
static ssize_t __fuse_direct_write(struct fuse_io_priv *io,
@@ -2369,6 +2369,13 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
inode = file->f_mapping->host;
i_size = i_size_read(inode);
+ /* optimization for short read */
+ if (rw != WRITE && offset + count > i_size) {
+ if (offset >= i_size)
+ return 0;
+ count = i_size - offset;
+ }
+
io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
if (!io)
return -ENOMEM;
@@ -2392,13 +2399,13 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
* to wait on real async I/O requests, so we must submit this request
* synchronously.
*/
- if (!is_sync_kiocb(iocb) && (offset + count > i_size) && rw == WRITE)
+ if (!is_sync_kiocb(iocb) && (offset + count > i_size))
io->async = false;
if (rw == WRITE)
ret = __fuse_direct_write(io, iov, nr_segs, &pos);
else
- ret = __fuse_direct_read(io, iov, nr_segs, &pos);
+ ret = __fuse_direct_read(io, iov, nr_segs, &pos, count);
if (io->async) {
fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
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