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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2012-05-30 00:06:43 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-30 01:22:23 +0200 |
| commit | 782182e53a6cdb3e3d04cc40516e173046942a32 (patch) | |
| tree | 9e6f74d90b65ca12d4992c034ffa9b2415f37068 /mm/filemap.c | |
| parent | tmpfs: support SEEK_DATA and SEEK_HOLE (diff) | |
| download | linux-782182e53a6cdb3e3d04cc40516e173046942a32.tar.xz linux-782182e53a6cdb3e3d04cc40516e173046942a32.zip | |
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/filemap.c')
| -rw-r--r-- | mm/filemap.c | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 79c4b2b0b14e..64b48f934b89 100644 --- a/mm/filemap.c +++ b/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 |