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-rw-r--r--target/linux/generic/patches-4.3/903-debloat_direct_io.patch80
1 files changed, 80 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.3/903-debloat_direct_io.patch b/target/linux/generic/patches-4.3/903-debloat_direct_io.patch
new file mode 100644
index 0000000000..2ff3093fbe
--- /dev/null
+++ b/target/linux/generic/patches-4.3/903-debloat_direct_io.patch
@@ -0,0 +1,80 @@
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -68,6 +68,11 @@ config FILE_LOCKING
+ for filesystems like NFS and for the flock() system
+ call. Disabling this option saves about 11k.
+
++config DIRECT_IO
++ bool "Enable O_DIRECT support" if EXPERT
++ depends on BLOCK
++ default y
++
+ source "fs/notify/Kconfig"
+
+ source "fs/quota/Kconfig"
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -14,7 +14,8 @@ obj-y := open.o read_write.o file_table.
+ stack.o fs_struct.o statfs.o fs_pin.o nsfs.o
+
+ ifeq ($(CONFIG_BLOCK),y)
+-obj-y += buffer.o block_dev.o direct-io.o mpage.o
++obj-y += buffer.o block_dev.o mpage.o
++obj-$(CONFIG_DIRECT_IO) += direct-io.o
+ else
+ obj-y += no-block.o
+ endif
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -2695,6 +2695,7 @@ enum {
+ DIO_SKIP_DIO_COUNT = 0x08,
+ };
+
++#ifdef CONFIG_DIRECT_IO
+ void dio_end_io(struct bio *bio, int error);
+
+ ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
+@@ -2702,6 +2703,18 @@ ssize_t __blockdev_direct_IO(struct kioc
+ loff_t offset, get_block_t get_block,
+ dio_iodone_t end_io, dio_submit_t submit_io,
+ int flags);
++#else
++static inline void dio_end_io(struct bio *bio, int error)
++{
++}
++static inline ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
++ struct block_device *bdev, struct iov_iter *iter, loff_t offset,
++ get_block_t get_block, dio_iodone_t end_io,
++ dio_submit_t submit_io, int flags)
++{
++ return -EOPNOTSUPP;
++}
++#endif
+
+ static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
+ struct inode *inode,
+--- a/fs/fcntl.c
++++ b/fs/fcntl.c
+@@ -52,8 +52,10 @@ static int setfl(int fd, struct file * f
+ arg |= O_NONBLOCK;
+
+ if (arg & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!filp->f_mapping || !filp->f_mapping->a_ops ||
+ !filp->f_mapping->a_ops->direct_IO)
++#endif
+ return -EINVAL;
+ }
+
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -673,7 +673,9 @@ int open_check_o_direct(struct file *f)
+ {
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
++#ifdef CONFIG_DIRECT_IO
+ if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
++#endif
+ return -EINVAL;
+ }
+ return 0;