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author | Felix Fietkau <nbd@openwrt.org> | 2012-12-17 15:11:39 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2012-12-17 15:11:39 +0000 |
commit | 0a9eb9e6d79e1b734f233a7f8ecb3f1929d8acc1 (patch) | |
tree | 13e6f7873fdf64bc6039bc85ffa5a404ff519cc8 /target/linux/generic/patches-3.7/903-debloat_direct_io.patch | |
parent | 3699160b8c9f8fd816ab2b26147993ca493b9ea7 (diff) | |
download | master-187ad058-0a9eb9e6d79e1b734f233a7f8ecb3f1929d8acc1.tar.gz master-187ad058-0a9eb9e6d79e1b734f233a7f8ecb3f1929d8acc1.tar.bz2 master-187ad058-0a9eb9e6d79e1b734f233a7f8ecb3f1929d8acc1.zip |
kernel: add some debloat patches, strip down procfs and make O_DIRECT support optional, saves ~15K after lzma on MIPS
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34737 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-3.7/903-debloat_direct_io.patch')
-rw-r--r-- | target/linux/generic/patches-3.7/903-debloat_direct_io.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.7/903-debloat_direct_io.patch b/target/linux/generic/patches-3.7/903-debloat_direct_io.patch new file mode 100644 index 0000000000..20b2423af1 --- /dev/null +++ b/target/linux/generic/patches-3.7/903-debloat_direct_io.patch @@ -0,0 +1,94 @@ +--- a/fs/Kconfig ++++ b/fs/Kconfig +@@ -62,6 +62,11 @@ 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 + + ifeq ($(CONFIG_BLOCK),y) +-obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o ++obj-y += buffer.o bio.o block_dev.o mpage.o ioprio.o ++obj-$(CONFIG_DIRECT_IO) += direct-io.o + else + obj-y += no-block.o + endif +--- a/include/linux/fs.h ++++ b/include/linux/fs.h +@@ -2444,20 +2444,36 @@ enum { + DIO_SKIP_HOLES = 0x02, + }; + ++#ifdef CONFIG_DIRECT_IO + void dio_end_io(struct bio *bio, int error); + + ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, + struct block_device *bdev, const struct iovec *iov, loff_t offset, + unsigned long nr_segs, 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(int rw, struct kiocb *iocb, struct inode *inode, ++ struct block_device *bdev, const struct iovec *iov, loff_t offset, ++ unsigned long nr_segs, 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(int rw, struct kiocb *iocb, + struct inode *inode, const struct iovec *iov, loff_t offset, + unsigned long nr_segs, get_block_t get_block) + { ++#ifdef CONFIG_DIRECT_IO + return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, get_block, NULL, NULL, + DIO_LOCKING | DIO_SKIP_HOLES); ++#endif + } + #endif + +--- a/fs/fcntl.c ++++ b/fs/fcntl.c +@@ -51,8 +51,10 @@ 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 +@@ -630,9 +630,12 @@ 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) && +- (!f->f_mapping->a_ops->get_xip_mem))) { ++ (!f->f_mapping->a_ops->get_xip_mem))) ++#endif ++ { + return -EINVAL; + } + } |