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authorCong Wang <xiyou.wangcong@gmail.com>2012-05-30 02:06:43 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-30 03:22:23 +0400
commit782182e53a6cdb3e3d04cc40516e173046942a32 (patch)
tree9e6f74d90b65ca12d4992c034ffa9b2415f37068 /mm/readahead.c
parent4fb5ef089b288942c6fc3f85c4ecb4016c1aa4c3 (diff)
downloadlinux-782182e53a6cdb3e3d04cc40516e173046942a32.tar.xz
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@gmail.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/readahead.c')
-rw-r--r--mm/readahead.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index cbcbb02f3e28..ea8f8fa21649 100644
--- a/mm/readahead.c
+++ b/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 address_space *mapping,
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