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- --- a/fs/Kconfig
- +++ b/fs/Kconfig
- @@ -74,6 +74,11 @@ 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
- @@ -2722,6 +2722,7 @@ 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,
- @@ -2729,6 +2730,18 @@ 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;
|
