[PATCH 6/6] fs/splice: full support for compiling out splice
Entirely compile out splice translation unit when the system is configured without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined). Exported fs/splice functions are transparently mocked out with static inlines. Because userspace support for splice has already been removed by this patch-set, the exported functions cannot be called anyway. Mocking them out prevents a maintenance burden on file system drivers. The bloat score resulting from this patch given a tinyconfig is: add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845) function old new delta pipe_to_null 4 - -4 generic_pipe_buf_nosteal 6 - -6 spd_release_page 10 - -10 PageUptodate 22 11 -11 lock_page 36 24 -12 page_cache_pipe_buf_release 16 - -16 splice_write_null 24 4 -20 page_cache_pipe_buf_ops 20 - -20 nosteal_pipe_buf_ops 20 - -20 default_pipe_buf_ops 20 - -20 generic_splice_sendpage 24 - -24 splice_shrink_spd 27 - -27 direct_splice_actor 47 - -47 default_file_splice_write 49 - -49 wakeup_pipe_writers 54 - -54 write_pipe_buf71 - -71 page_cache_pipe_buf_confirm 80 - -80 splice_grow_spd 87 - -87 splice_from_pipe 93 - -93 splice_from_pipe_next106 --106 pipe_to_sendpage 109 --109 page_cache_pipe_buf_steal114 --114 generic_file_splice_read 131 8-123 do_splice_direct 148 --148 __splice_from_pipe 246 --246 splice_direct_to_actor 416 --416 splice_to_pipe 417 --417 default_file_splice_read 688 --688 iter_file_splice_write 702 4-698 __generic_file_splice_read 1109 - -1109 The bloat score for the entire CONFIG_SYSCALL_SPLICE patch-set is: add/remove: 0/41 grow/shrink: 5/7 up/down: 23/-8422 (-8399) function old new delta sys_pwritev 115 122 +7 sys_preadv 115 122 +7 fdput_pos 29 36 +7 sys_pwrite64 115 116 +1 sys_pread64 115 116 +1 pipe_to_null 4 - -4 generic_pipe_buf_nosteal 6 - -6 spd_release_page 10 - -10 fdput 11 - -11 PageUptodate 22 11 -11 lock_page 36 24 -12 signal_pending39 26 -13 fdget 56 42 -14 page_cache_pipe_buf_release 16 - -16 user_page_pipe_buf_ops20 - -20 splice_write_null 24 4 -20 page_cache_pipe_buf_ops 20 - -20 nosteal_pipe_buf_ops 20 - -20 default_pipe_buf_ops 20 - -20 generic_splice_sendpage 24 - -24 user_page_pipe_buf_steal 25 - -25 splice_shrink_spd 27 - -27 pipe_to_user 43 - -43 direct_splice_actor 47 - -47 default_file_splice_write 49 - -49 wakeup_pipe_writers 54 - -54 wakeup_pipe_readers 54 - -54 write_pipe_buf71 - -71 page_cache_pipe_buf_confirm 80 - -80 splice_grow_spd 87 - -87 do_splice_to 87 - -87 ipipe_prep.part 92 - -92 splice_from_pipe 93 - -93 splice_from_pipe_next107 --107 pipe_to_sendpage
[PATCH 6/6] fs/splice: full support for compiling out splice
Entirely compile out splice translation unit when the system is configured without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined). Exported fs/splice functions are transparently mocked out with static inlines. Because userspace support for splice has already been removed by this patch-set, the exported functions cannot be called anyway. Mocking them out prevents a maintenance burden on file system drivers. The bloat score resulting from this patch given a tinyconfig is: add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845) function old new delta pipe_to_null 4 - -4 generic_pipe_buf_nosteal 6 - -6 spd_release_page 10 - -10 PageUptodate 22 11 -11 lock_page 36 24 -12 page_cache_pipe_buf_release 16 - -16 splice_write_null 24 4 -20 page_cache_pipe_buf_ops 20 - -20 nosteal_pipe_buf_ops 20 - -20 default_pipe_buf_ops 20 - -20 generic_splice_sendpage 24 - -24 splice_shrink_spd 27 - -27 direct_splice_actor 47 - -47 default_file_splice_write 49 - -49 wakeup_pipe_writers 54 - -54 write_pipe_buf71 - -71 page_cache_pipe_buf_confirm 80 - -80 splice_grow_spd 87 - -87 splice_from_pipe 93 - -93 splice_from_pipe_next106 --106 pipe_to_sendpage 109 --109 page_cache_pipe_buf_steal114 --114 generic_file_splice_read 131 8-123 do_splice_direct 148 --148 __splice_from_pipe 246 --246 splice_direct_to_actor 416 --416 splice_to_pipe 417 --417 default_file_splice_read 688 --688 iter_file_splice_write 702 4-698 __generic_file_splice_read 1109 - -1109 The bloat score for the entire CONFIG_SYSCALL_SPLICE patch-set is: add/remove: 0/41 grow/shrink: 5/7 up/down: 23/-8422 (-8399) function old new delta sys_pwritev 115 122 +7 sys_preadv 115 122 +7 fdput_pos 29 36 +7 sys_pwrite64 115 116 +1 sys_pread64 115 116 +1 pipe_to_null 4 - -4 generic_pipe_buf_nosteal 6 - -6 spd_release_page 10 - -10 fdput 11 - -11 PageUptodate 22 11 -11 lock_page 36 24 -12 signal_pending39 26 -13 fdget 56 42 -14 page_cache_pipe_buf_release 16 - -16 user_page_pipe_buf_ops20 - -20 splice_write_null 24 4 -20 page_cache_pipe_buf_ops 20 - -20 nosteal_pipe_buf_ops 20 - -20 default_pipe_buf_ops 20 - -20 generic_splice_sendpage 24 - -24 user_page_pipe_buf_steal 25 - -25 splice_shrink_spd 27 - -27 pipe_to_user 43 - -43 direct_splice_actor 47 - -47 default_file_splice_write 49 - -49 wakeup_pipe_writers 54 - -54 wakeup_pipe_readers 54 - -54 write_pipe_buf71 - -71 page_cache_pipe_buf_confirm 80 - -80 splice_grow_spd 87 - -87 do_splice_to 87 - -87 ipipe_prep.part 92 - -92 splice_from_pipe 93 - -93 splice_from_pipe_next107 --107 pipe_to_sendpage
Re: [PATCH 6/6] fs/splice: full support for compiling out splice
On Sat, Nov 22, 2014 at 10:00:01PM +0100, Pieter Smith wrote: > Entirely compile out splice translation unit when the system is configured > without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined). > > add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845) Very nice! - Josh Triplett > function old new delta > pipe_to_null 4 - -4 > generic_pipe_buf_nosteal 6 - -6 > spd_release_page 10 - -10 > PageUptodate 22 11 -11 > lock_page 36 24 -12 > page_cache_pipe_buf_release 16 - -16 > splice_write_null 24 4 -20 > page_cache_pipe_buf_ops 20 - -20 > nosteal_pipe_buf_ops 20 - -20 > default_pipe_buf_ops 20 - -20 > generic_splice_sendpage 24 - -24 > splice_shrink_spd 27 - -27 > direct_splice_actor 47 - -47 > default_file_splice_write 49 - -49 > wakeup_pipe_writers 54 - -54 > write_pipe_buf71 - -71 > page_cache_pipe_buf_confirm 80 - -80 > splice_grow_spd 87 - -87 > splice_from_pipe 93 - -93 > splice_from_pipe_next106 --106 > pipe_to_sendpage 109 --109 > page_cache_pipe_buf_steal114 --114 > generic_file_splice_read 131 8-123 > do_splice_direct 148 --148 > __splice_from_pipe 246 --246 > splice_direct_to_actor 416 --416 > splice_to_pipe 417 --417 > default_file_splice_read 688 --688 > iter_file_splice_write 702 4-698 > __generic_file_splice_read 1109 - -1109 > > Signed-off-by: Pieter Smith > --- > fs/Makefile| 3 ++- > fs/splice.c| 2 -- > include/linux/fs.h | 26 ++ > include/linux/splice.h | 43 +++ > 4 files changed, 71 insertions(+), 3 deletions(-) > > diff --git a/fs/Makefile b/fs/Makefile > index fb7646e..9395622 100644 > --- a/fs/Makefile > +++ b/fs/Makefile > @@ -10,7 +10,7 @@ obj-y :=open.o read_write.o file_table.o super.o \ > ioctl.o readdir.o select.o dcache.o inode.o \ > attr.o bad_inode.o file.o filesystems.o namespace.o \ > seq_file.o xattr.o libfs.o fs-writeback.o \ > - pnode.o splice.o sync.o utimes.o \ > + pnode.o sync.o utimes.o \ > stack.o fs_struct.o statfs.o fs_pin.o > > ifeq ($(CONFIG_BLOCK),y) > @@ -22,6 +22,7 @@ endif > obj-$(CONFIG_PROC_FS) += proc_namespace.o > > obj-$(CONFIG_FSNOTIFY) += notify/ > +obj-$(CONFIG_SYSCALL_SPLICE) += splice.o > obj-$(CONFIG_EPOLL) += eventpoll.o > obj-$(CONFIG_ANON_INODES)+= anon_inodes.o > obj-$(CONFIG_SIGNALFD) += signalfd.o > diff --git a/fs/splice.c b/fs/splice.c > index 7c4c695..44b201b 100644 > --- a/fs/splice.c > +++ b/fs/splice.c > @@ -1316,7 +1316,6 @@ long do_splice_direct(struct file *in, loff_t *ppos, > struct file *out, > return ret; > } > > -#ifdef CONFIG_SYSCALL_SPLICE > static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe, > struct pipe_inode_info *opipe, > size_t len, unsigned int flags); > @@ -2201,5 +2200,4 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, > in_fd, > return do_sendfile(out_fd, in_fd, NULL, count, 0); > } > #endif > -#endif > > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 04c0975..9b3054e 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -2449,6 +2449,7 @@ extern void block_sync_page(struct page *page); > #define __splice_p(x) NULL > #endif > > +#ifdef CONFIG_SYSCALL_SPLICE > /* fs/splice.c */ > extern ssize_t generic_file_splice_read(struct file *, loff_t *, > struct pipe_inode_info *, size_t, unsigned int); > @@ -2458,6 +2459,31 @@ extern ssize_t iter_file_splice_write(struct > pipe_inode_info *, > struct file *, loff_t *, size_t, unsigned int); > extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, > struct file *out, loff_t *, size_t len, unsigned int flags); > +#else > +static inline ssize_t
[PATCH 6/6] fs/splice: full support for compiling out splice
Entirely compile out splice translation unit when the system is configured
without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined).
add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845)
function old new delta
pipe_to_null 4 - -4
generic_pipe_buf_nosteal 6 - -6
spd_release_page 10 - -10
PageUptodate 22 11 -11
lock_page 36 24 -12
page_cache_pipe_buf_release 16 - -16
splice_write_null 24 4 -20
page_cache_pipe_buf_ops 20 - -20
nosteal_pipe_buf_ops 20 - -20
default_pipe_buf_ops 20 - -20
generic_splice_sendpage 24 - -24
splice_shrink_spd 27 - -27
direct_splice_actor 47 - -47
default_file_splice_write 49 - -49
wakeup_pipe_writers 54 - -54
write_pipe_buf71 - -71
page_cache_pipe_buf_confirm 80 - -80
splice_grow_spd 87 - -87
splice_from_pipe 93 - -93
splice_from_pipe_next106 --106
pipe_to_sendpage 109 --109
page_cache_pipe_buf_steal114 --114
generic_file_splice_read 131 8-123
do_splice_direct 148 --148
__splice_from_pipe 246 --246
splice_direct_to_actor 416 --416
splice_to_pipe 417 --417
default_file_splice_read 688 --688
iter_file_splice_write 702 4-698
__generic_file_splice_read 1109 - -1109
Signed-off-by: Pieter Smith
---
fs/Makefile| 3 ++-
fs/splice.c| 2 --
include/linux/fs.h | 26 ++
include/linux/splice.h | 43 +++
4 files changed, 71 insertions(+), 3 deletions(-)
diff --git a/fs/Makefile b/fs/Makefile
index fb7646e..9395622 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -10,7 +10,7 @@ obj-y := open.o read_write.o file_table.o super.o \
ioctl.o readdir.o select.o dcache.o inode.o \
attr.o bad_inode.o file.o filesystems.o namespace.o \
seq_file.o xattr.o libfs.o fs-writeback.o \
- pnode.o splice.o sync.o utimes.o \
+ pnode.o sync.o utimes.o \
stack.o fs_struct.o statfs.o fs_pin.o
ifeq ($(CONFIG_BLOCK),y)
@@ -22,6 +22,7 @@ endif
obj-$(CONFIG_PROC_FS) += proc_namespace.o
obj-$(CONFIG_FSNOTIFY) += notify/
+obj-$(CONFIG_SYSCALL_SPLICE) += splice.o
obj-$(CONFIG_EPOLL)+= eventpoll.o
obj-$(CONFIG_ANON_INODES) += anon_inodes.o
obj-$(CONFIG_SIGNALFD) += signalfd.o
diff --git a/fs/splice.c b/fs/splice.c
index 7c4c695..44b201b 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1316,7 +1316,6 @@ long do_splice_direct(struct file *in, loff_t *ppos,
struct file *out,
return ret;
}
-#ifdef CONFIG_SYSCALL_SPLICE
static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
struct pipe_inode_info *opipe,
size_t len, unsigned int flags);
@@ -2201,5 +2200,4 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int,
in_fd,
return do_sendfile(out_fd, in_fd, NULL, count, 0);
}
#endif
-#endif
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 04c0975..9b3054e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2449,6 +2449,7 @@ extern void block_sync_page(struct page *page);
#define __splice_p(x) NULL
#endif
+#ifdef CONFIG_SYSCALL_SPLICE
/* fs/splice.c */
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
@@ -2458,6 +2459,31 @@ extern ssize_t iter_file_splice_write(struct
pipe_inode_info *,
struct file *, loff_t *, size_t, unsigned int);
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
struct file *out, loff_t *, size_t len, unsigned int flags);
+#else
+static inline ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len, unsigned int flags)
+{
+ return -EPERM;
+}
+
+static inline ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe,
[PATCH 6/6] fs/splice: full support for compiling out splice
Entirely compile out splice translation unit when the system is configured
without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined).
add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845)
function old new delta
pipe_to_null 4 - -4
generic_pipe_buf_nosteal 6 - -6
spd_release_page 10 - -10
PageUptodate 22 11 -11
lock_page 36 24 -12
page_cache_pipe_buf_release 16 - -16
splice_write_null 24 4 -20
page_cache_pipe_buf_ops 20 - -20
nosteal_pipe_buf_ops 20 - -20
default_pipe_buf_ops 20 - -20
generic_splice_sendpage 24 - -24
splice_shrink_spd 27 - -27
direct_splice_actor 47 - -47
default_file_splice_write 49 - -49
wakeup_pipe_writers 54 - -54
write_pipe_buf71 - -71
page_cache_pipe_buf_confirm 80 - -80
splice_grow_spd 87 - -87
splice_from_pipe 93 - -93
splice_from_pipe_next106 --106
pipe_to_sendpage 109 --109
page_cache_pipe_buf_steal114 --114
generic_file_splice_read 131 8-123
do_splice_direct 148 --148
__splice_from_pipe 246 --246
splice_direct_to_actor 416 --416
splice_to_pipe 417 --417
default_file_splice_read 688 --688
iter_file_splice_write 702 4-698
__generic_file_splice_read 1109 - -1109
Signed-off-by: Pieter Smith pie...@boesman.nl
---
fs/Makefile| 3 ++-
fs/splice.c| 2 --
include/linux/fs.h | 26 ++
include/linux/splice.h | 43 +++
4 files changed, 71 insertions(+), 3 deletions(-)
diff --git a/fs/Makefile b/fs/Makefile
index fb7646e..9395622 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -10,7 +10,7 @@ obj-y := open.o read_write.o file_table.o super.o \
ioctl.o readdir.o select.o dcache.o inode.o \
attr.o bad_inode.o file.o filesystems.o namespace.o \
seq_file.o xattr.o libfs.o fs-writeback.o \
- pnode.o splice.o sync.o utimes.o \
+ pnode.o sync.o utimes.o \
stack.o fs_struct.o statfs.o fs_pin.o
ifeq ($(CONFIG_BLOCK),y)
@@ -22,6 +22,7 @@ endif
obj-$(CONFIG_PROC_FS) += proc_namespace.o
obj-$(CONFIG_FSNOTIFY) += notify/
+obj-$(CONFIG_SYSCALL_SPLICE) += splice.o
obj-$(CONFIG_EPOLL)+= eventpoll.o
obj-$(CONFIG_ANON_INODES) += anon_inodes.o
obj-$(CONFIG_SIGNALFD) += signalfd.o
diff --git a/fs/splice.c b/fs/splice.c
index 7c4c695..44b201b 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1316,7 +1316,6 @@ long do_splice_direct(struct file *in, loff_t *ppos,
struct file *out,
return ret;
}
-#ifdef CONFIG_SYSCALL_SPLICE
static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
struct pipe_inode_info *opipe,
size_t len, unsigned int flags);
@@ -2201,5 +2200,4 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int,
in_fd,
return do_sendfile(out_fd, in_fd, NULL, count, 0);
}
#endif
-#endif
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 04c0975..9b3054e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2449,6 +2449,7 @@ extern void block_sync_page(struct page *page);
#define __splice_p(x) NULL
#endif
+#ifdef CONFIG_SYSCALL_SPLICE
/* fs/splice.c */
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
@@ -2458,6 +2459,31 @@ extern ssize_t iter_file_splice_write(struct
pipe_inode_info *,
struct file *, loff_t *, size_t, unsigned int);
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
struct file *out, loff_t *, size_t len, unsigned int flags);
+#else
+static inline ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len, unsigned int flags)
+{
+ return -EPERM;
+}
+
+static inline ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
+ struct
Re: [PATCH 6/6] fs/splice: full support for compiling out splice
On Sat, Nov 22, 2014 at 10:00:01PM +0100, Pieter Smith wrote: Entirely compile out splice translation unit when the system is configured without splice family of syscalls (i.e. CONFIG_SYSCALL_SPLICE is undefined). add/remove: 0/25 grow/shrink: 0/5 up/down: 0/-4845 (-4845) Very nice! - Josh Triplett function old new delta pipe_to_null 4 - -4 generic_pipe_buf_nosteal 6 - -6 spd_release_page 10 - -10 PageUptodate 22 11 -11 lock_page 36 24 -12 page_cache_pipe_buf_release 16 - -16 splice_write_null 24 4 -20 page_cache_pipe_buf_ops 20 - -20 nosteal_pipe_buf_ops 20 - -20 default_pipe_buf_ops 20 - -20 generic_splice_sendpage 24 - -24 splice_shrink_spd 27 - -27 direct_splice_actor 47 - -47 default_file_splice_write 49 - -49 wakeup_pipe_writers 54 - -54 write_pipe_buf71 - -71 page_cache_pipe_buf_confirm 80 - -80 splice_grow_spd 87 - -87 splice_from_pipe 93 - -93 splice_from_pipe_next106 --106 pipe_to_sendpage 109 --109 page_cache_pipe_buf_steal114 --114 generic_file_splice_read 131 8-123 do_splice_direct 148 --148 __splice_from_pipe 246 --246 splice_direct_to_actor 416 --416 splice_to_pipe 417 --417 default_file_splice_read 688 --688 iter_file_splice_write 702 4-698 __generic_file_splice_read 1109 - -1109 Signed-off-by: Pieter Smith pie...@boesman.nl --- fs/Makefile| 3 ++- fs/splice.c| 2 -- include/linux/fs.h | 26 ++ include/linux/splice.h | 43 +++ 4 files changed, 71 insertions(+), 3 deletions(-) diff --git a/fs/Makefile b/fs/Makefile index fb7646e..9395622 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -10,7 +10,7 @@ obj-y :=open.o read_write.o file_table.o super.o \ ioctl.o readdir.o select.o dcache.o inode.o \ attr.o bad_inode.o file.o filesystems.o namespace.o \ seq_file.o xattr.o libfs.o fs-writeback.o \ - pnode.o splice.o sync.o utimes.o \ + pnode.o sync.o utimes.o \ stack.o fs_struct.o statfs.o fs_pin.o ifeq ($(CONFIG_BLOCK),y) @@ -22,6 +22,7 @@ endif obj-$(CONFIG_PROC_FS) += proc_namespace.o obj-$(CONFIG_FSNOTIFY) += notify/ +obj-$(CONFIG_SYSCALL_SPLICE) += splice.o obj-$(CONFIG_EPOLL) += eventpoll.o obj-$(CONFIG_ANON_INODES)+= anon_inodes.o obj-$(CONFIG_SIGNALFD) += signalfd.o diff --git a/fs/splice.c b/fs/splice.c index 7c4c695..44b201b 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -1316,7 +1316,6 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, return ret; } -#ifdef CONFIG_SYSCALL_SPLICE static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe, struct pipe_inode_info *opipe, size_t len, unsigned int flags); @@ -2201,5 +2200,4 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, return do_sendfile(out_fd, in_fd, NULL, count, 0); } #endif -#endif diff --git a/include/linux/fs.h b/include/linux/fs.h index 04c0975..9b3054e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2449,6 +2449,7 @@ extern void block_sync_page(struct page *page); #define __splice_p(x) NULL #endif +#ifdef CONFIG_SYSCALL_SPLICE /* fs/splice.c */ extern ssize_t generic_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); @@ -2458,6 +2459,31 @@ extern ssize_t iter_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, struct file *out, loff_t *, size_t len, unsigned int flags); +#else +static inline ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, + struct pipe_inode_info
