The patch titled
Subject: mm: move readahead syscall to mm/readahead.c
has been added to the -mm tree. Its filename is
mm-move-readahead-syscall-to-mm-readaheadc.patch
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------------------------------------------------------
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Subject: mm: move readahead syscall to mm/readahead.c
It is better to define readahead(2) in mm/readahead.c than in
mm/filemap.c.
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Cc: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 39 ---------------------------------------
mm/readahead.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 40 insertions(+), 39 deletions(-)
diff -puN mm/filemap.c~mm-move-readahead-syscall-to-mm-readaheadc mm/filemap.c
--- a/mm/filemap.c~mm-move-readahead-syscall-to-mm-readaheadc
+++ a/mm/filemap.c
@@ -29,7 +29,6 @@
#include <linux/pagevec.h>
#include <linux/blkdev.h>
#include <linux/security.h>
-#include <linux/syscalls.h>
#include <linux/cpuset.h>
#include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
#include <linux/memcontrol.h>
@@ -1478,44 +1477,6 @@ out:
}
EXPORT_SYMBOL(generic_file_aio_read);
-static ssize_t
-do_readahead(struct address_space *mapping, struct file *filp,
- pgoff_t index, unsigned long nr)
-{
- if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage)
- return -EINVAL;
-
- force_page_cache_readahead(mapping, filp, index, nr);
- return 0;
-}
-
-SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
-{
- ssize_t ret;
- struct file *file;
-
- ret = -EBADF;
- file = fget(fd);
- if (file) {
- if (file->f_mode & FMODE_READ) {
- struct address_space *mapping = file->f_mapping;
- pgoff_t start = offset >> PAGE_CACHE_SHIFT;
- pgoff_t end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
- unsigned long len = end - start + 1;
- ret = do_readahead(mapping, file, start, len);
- }
- fput(file);
- }
- return ret;
-}
-#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
-asmlinkage long SyS_readahead(long fd, loff_t offset, long count)
-{
- return SYSC_readahead((int) fd, offset, (size_t) count);
-}
-SYSCALL_ALIAS(sys_readahead, SyS_readahead);
-#endif
-
#ifdef CONFIG_MMU
/**
* page_cache_read - adds requested page to the page cache if not already there
diff -puN mm/readahead.c~mm-move-readahead-syscall-to-mm-readaheadc mm/readahead.c
--- a/mm/readahead.c~mm-move-readahead-syscall-to-mm-readaheadc
+++ a/mm/readahead.c
@@ -17,6 +17,8 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/pagevec.h>
#include <linux/pagemap.h>
+#include <linux/syscalls.h>
+#include <linux/file.h>
/*
* Initialise a struct file's readahead state. Assumes that the caller has
@@ -562,3 +564,41 @@ page_cache_async_readahead(struct addres
ondemand_readahead(mapping, ra, filp, true, offset, req_size);
}
EXPORT_SYMBOL_GPL(page_cache_async_readahead);
+
+static ssize_t
+do_readahead(struct address_space *mapping, struct file *filp,
+ pgoff_t index, unsigned long nr)
+{
+ if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage)
+ return -EINVAL;
+
+ force_page_cache_readahead(mapping, filp, index, nr);
+ return 0;
+}
+
+SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
+{
+ ssize_t ret;
+ struct file *file;
+
+ ret = -EBADF;
+ file = fget(fd);
+ if (file) {
+ if (file->f_mode & FMODE_READ) {
+ struct address_space *mapping = file->f_mapping;
+ pgoff_t start = offset >> PAGE_CACHE_SHIFT;
+ pgoff_t end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
+ unsigned long len = end - start + 1;
+ ret = do_readahead(mapping, file, start, len);
+ }
+ fput(file);
+ }
+ return ret;
+}
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_readahead(long fd, loff_t offset, long count)
+{
+ return SYSC_readahead((int) fd, offset, (size_t) count);
+}
+SYSCALL_ALIAS(sys_readahead, SyS_readahead);
+#endif
_
Subject: Subject: mm: move readahead syscall to mm/readahead.c
Patches currently in -mm which might be from xiyou.wangcong@xxxxxxxxx are
linux-next.patch
cris-select-generic_atomic64.patch
bug-introduce-build_bug_on_invalid-macro.patch
bug-completely-remove-code-generated-by-disabled-vm_bug_on.patch
tmpfs-enable-nosec-optimization.patch
mm-move-readahead-syscall-to-mm-readaheadc.patch
proc-clean-up-proc-pid-environ-handling.patch
proc-clean-up-proc-pid-environ-handling-checkpatch-fixes.patch
proc-remove-mm_for_maps.patch
proc-use-mm_access-instead-of-ptrace_may_access.patch
proc-use-is_err_or_null.patch
fs-move-file_remove_suid-to-fs-inodec.patch
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