linux/drivers/base/devtmpfs.c, branch v5.5

devtmpfs: use do_mount() instead of ksys_mount()

2019-12-12T13:49:57Z

In devtmpfs, do_mount() can be called directly instead of complex wrapping by ksys_mount(): - the first and third arguments are const strings in the kernel, and do not need to be copied over from userspace; - the fifth argument is NULL, and therefore no page needs to be copied over from userspace; - the second and fourth argument are passed through anyway. Signed-off-by: Dominik Brodowski

vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API

2019-09-13T01:05:34Z

Convert the ramfs, shmem, tmpfs, devtmpfs and rootfs filesystems to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Note that tmpfs is slightly tricky as it can contain embedded commas, so it can't be trivially split up using strsep() to break on commas in generic_parse_monolithic(). Instead, tmpfs has to supply its own generic parser. However, if tmpfs changes, then devtmpfs and rootfs, which are wrappers around tmpfs or ramfs, must change too - and thus so must ramfs, so these had to be converted also. [AV: rewritten] Signed-off-by: David Howells cc: Hugh Dickins cc: linux-mm@kvack.org Signed-off-by: Al Viro

make shmem_fill_super() static

2019-09-05T18:34:28Z

... have callers use shmem_mount() Signed-off-by: Al Viro

devtmpfs: don't mix {ramfs,shmem}_fill_super() with mount_single()

2019-09-05T18:34:27Z

Create an internal-only type matching the current devtmpfs, never register it and have one kernel-internal mount done. That thing gets mounted only once, so it is free to use mount_nodev(). The "public" devtmpfs (the one we do register, and only after the internal mount of the real thing is done) simply gets and returns an extra reference to the internal superblock. Signed-off-by: Al Viro

constify ksys_mount() string arguments

2019-07-05T02:01:59Z

Signed-off-by: Al Viro

vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled

2018-12-20T16:32:56Z

Only the mount namespace code that implements mount(2) should be using the MS_* flags. Suppress them inside the kernel unless uapi/linux/mount.h is included. Signed-off-by: David Howells Signed-off-by: Al Viro Reviewed-by: David Howells

drivers/base/devtmpfs.c: don't pretend path is const in delete_path

2018-09-16T20:37:16Z

path is the result of kstrdup, and we repeatedly call strrchr on it, modifying it through the returned pointer. So there's no reason to pretend path is const. Signed-off-by: Rasmus Villemoes Signed-off-by: Greg Kroah-Hartman

kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()

2018-04-02T18:16:06Z

Using this helper allows us to avoid the in-kernel calls to the sys_unshare() 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_unshare(). 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 Cc: Andrew Morton Cc: Ingo Molnar Signed-off-by: Dominik Brodowski

fs: add ksys_chdir() helper; remove in-kernel calls to sys_chdir()

2018-04-02T18:15:51Z

Using this helper allows us to avoid the in-kernel calls to the sys_chdir() 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_chdir(). 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 Cc: Andrew Morton Signed-off-by: Dominik Brodowski

fs: add ksys_chroot() helper; remove-in kernel calls to sys_chroot()

2018-04-02T18:15:50Z

Using this helper allows us to avoid the in-kernel calls to the sys_chroot() 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_chroot(). In the near future, the fs-external callers of ksys_chroot() should be converted to use kern_path()/set_fs_root() directly. Then ksys_chroot() can be moved within sys_chroot() again. 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 Signed-off-by: Dominik Brodowski