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fs: add ksys_mount() helper; remove in-kernel calls to sys_mount()

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Using this helper allows us to avoid the in-kernel calls to the sys_mount()
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_mount().

In the near future, all callers of ksys_mount() should be converted to call
do_mount() directly.

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: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2018-03-11 11:34:39 +01:00
parent ab0d1e85bf
commit 312db1aa1d
5 changed files with 19 additions and 9 deletions
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5
drivers/base/devtmpfs.c
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@@ -356,7 +356,8 @@ int devtmpfs_mount(const char *mntdir)
if (!thread)
return 0;
err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL);
err = ksys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT,
NULL);
if (err)
printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
else
@@ -382,7 +383,7 @@ static int devtmpfsd(void *p)
*err = sys_unshare(CLONE_NEWNS);
if (*err)
goto out;
*err = sys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
*err = ksys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
if (*err)
goto out;
sys_chdir("/.."); /* will traverse into overmounted root */