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authorMiklos Szeredi <mszeredi@suse.cz>2013-05-01 14:37:21 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2013-05-01 14:37:21 +0200
commit60b9df7a54804a965850db00beec4d3a2c002536 (patch)
treece3519c0708d6dd4113707c36a4ebdc6501542ef /fs/fuse
parentefb9fa9e911b23c7ea5330215bda778a7c69dba8 (diff)
fuse: add flag to turn on async direct IO
Without async DIO write requests to a single file were always serialized. With async DIO that's no longer the case. So don't turn on async DIO by default for fear of breaking backward compatibility. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c8
-rw-r--r--fs/fuse/fuse_i.h3
-rw-r--r--fs/fuse/inode.c4
3 files changed, 10 insertions, 5 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 1f8e3d60dc07..6ab7ca43f9e0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2371,14 +2371,14 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
{
ssize_t ret = 0;
- struct file *file = NULL;
+ struct file *file = iocb->ki_filp;
+ struct fuse_file *ff = file->private_data;
loff_t pos = 0;
struct inode *inode;
loff_t i_size;
size_t count = iov_length(iov, nr_segs);
struct fuse_io_priv *io;
- file = iocb->ki_filp;
pos = offset;
inode = file->f_mapping->host;
i_size = i_size_read(inode);
@@ -2403,9 +2403,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
io->file = file;
/*
* By default, we want to optimize all I/Os with async request
- * submission to the client filesystem.
+ * submission to the client filesystem if supported.
*/
- io->async = 1;
+ io->async = ff->fc->async_dio;
io->iocb = iocb;
/*
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 53b830e3b38f..fde7249a3a96 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -541,6 +541,9 @@ struct fuse_conn {
/** Does the filesystem want adaptive readdirplus? */
unsigned readdirplus_auto:1;
+ /** Does the filesystem support asynchronous direct-IO submission? */
+ unsigned async_dio:1;
+
/** The number of requests waiting for completion */
atomic_t num_waiting;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 17ec1f70524d..6201f81e4d3a 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -871,6 +871,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->do_readdirplus = 1;
if (arg->flags & FUSE_READDIRPLUS_AUTO)
fc->readdirplus_auto = 1;
+ if (arg->flags & FUSE_ASYNC_DIO)
+ fc->async_dio = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@@ -898,7 +900,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
- FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO;
+ FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);