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author | Hauke Mehrtens <hauke@hauke-m.de> | 2015-10-11 19:08:08 +0000 |
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committer | Hauke Mehrtens <hauke@hauke-m.de> | 2015-10-11 19:08:08 +0000 |
commit | b5842aed82e0c9101e99ec4bcf5959b931e98989 (patch) | |
tree | f9749eb8ce7d61f284cc4d91bac5aafd07de8344 /target/linux/generic/patches-4.3/903-debloat_direct_io.patch | |
parent | 3d1a65adb41db2758827fe81f36d92ab61618ea3 (diff) | |
download | upstream-b5842aed82e0c9101e99ec4bcf5959b931e98989.tar.gz upstream-b5842aed82e0c9101e99ec4bcf5959b931e98989.tar.bz2 upstream-b5842aed82e0c9101e99ec4bcf5959b931e98989.zip |
kernel: generic: add kernel 4.3
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
SVN-Revision: 47182
Diffstat (limited to 'target/linux/generic/patches-4.3/903-debloat_direct_io.patch')
-rw-r--r-- | target/linux/generic/patches-4.3/903-debloat_direct_io.patch | 80 |
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; |