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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 11:34:47 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:16:07 +0200
commit806cbae1228cc1a19b978c4513f6851e9ab7f388 (patch)
treefd47009c2d34d4bcd1fe713a01201f46533f7c4a /fs
parente2aaa9f423367ee03755d632555c242629a08d00 (diff)
downloadlwn-806cbae1228cc1a19b978c4513f6851e9ab7f388.tar.gz
lwn-806cbae1228cc1a19b978c4513f6851e9ab7f388.zip
fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall
Using this helper allows us to avoid the in-kernel calls to the sys_sync_file_range() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_sync_file_range(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs')
-rw-r--r--fs/sync.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/sync.c b/fs/sync.c
index 602ae94bb67e..9908a114d506 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -285,8 +285,8 @@ SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
* already-instantiated disk blocks, there are no guarantees here that the data
* will be available after a crash.
*/
-SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
- unsigned int, flags)
+int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
+ unsigned int flags)
{
int ret;
struct fd f;
@@ -364,10 +364,16 @@ out:
return ret;
}
+SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
+ unsigned int, flags)
+{
+ return ksys_sync_file_range(fd, offset, nbytes, flags);
+}
+
/* It would be nice if people remember that not all the world's an i386
when they introduce new system calls */
SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
loff_t, offset, loff_t, nbytes)
{
- return sys_sync_file_range(fd, offset, nbytes, flags);
+ return ksys_sync_file_range(fd, offset, nbytes, flags);
}