linux/drivers/base/devtmpfs.c, branch v5.8

Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2020-02-08T21:26:41Z

Pull vfs file system parameter updates from Al Viro: "Saner fs_parser.c guts and data structures. The system-wide registry of syntax types (string/enum/int32/oct32/.../etc.) is gone and so is the horror switch() in fs_parse() that would have to grow another case every time something got added to that system-wide registry. New syntax types can be added by filesystems easily now, and their namespace is that of functions - not of system-wide enum members. IOW, they can be shared or kept private and if some turn out to be widely useful, we can make them common library helpers, etc., without having to do anything whatsoever to fs_parse() itself. And we already get that kind of requests - the thing that finally pushed me into doing that was "oh, and let's add one for timeouts - things like 15s or 2h". If some filesystem really wants that, let them do it. Without somebody having to play gatekeeper for the variants blessed by direct support in fs_parse(), TYVM. Quite a bit of boilerplate is gone. And IMO the data structures make a lot more sense now. -200LoC, while we are at it" * 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (25 commits) tmpfs: switch to use of invalfc() cgroup1: switch to use of errorfc() et.al. procfs: switch to use of invalfc() hugetlbfs: switch to use of invalfc() cramfs: switch to use of errofc() et.al. gfs2: switch to use of errorfc() et.al. fuse: switch to use errorfc() et.al. ceph: use errorfc() and friends instead of spelling the prefix out prefix-handling analogues of errorf() and friends turn fs_param_is_... into functions fs_parse: handle optional arguments sanely fs_parse: fold fs_parameter_desc/fs_parameter_spec fs_parser: remove fs_parameter_description name field add prefix to fs_context->log ceph_parse_param(), ceph_parse_mon_ips(): switch to passing fc_log new primitive: __fs_parse() switch rbd and libceph to p_log-based primitives struct p_log, variants of warnf() et.al. taking that one instead teach logfc() to handle prefices, give it saner calling conventions get rid of cg_invalf() ...

fs_parse: fold fs_parameter_desc/fs_parameter_spec

2020-02-07T19:48:37Z

The former contains nothing but a pointer to an array of the latter... Signed-off-by: Al Viro

devtmpfs: factor out common tail of devtmpfs_{create,delete}_node

2020-01-22T14:28:15Z

There's some common boilerplate in devtmpfs_{create,delete}_node, put that in a little helper. Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20200115184154.3492-6-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

devtmpfs: initify a bit

2020-01-22T14:28:15Z

devtmpfs_mount() is only called from prepare_namespace() in init/do_mounts.c, which is an __init function, so devtmpfs_mount() can also be moved to .init.text. Then the mount_dev static variable is only referenced from __init functions (devtmpfs_mount and its initializer function mount_param). Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20200115184154.3492-5-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

devtmpfs: simplify initialization of mount_dev

2020-01-22T14:28:15Z

Avoid a bit of ifdeffery by using the IS_ENABLED() helper. Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20200115184154.3492-4-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

devtmpfs: factor out setup part of devtmpfsd()

2020-01-22T14:28:14Z

Factor out the setup part of devtmpfsd() to make it a bit easier to see that we always call setup_done() exactly once (provided of course the kthread is succesfully created). Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20200115184154.3492-3-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

devtmpfs: fix theoretical stale pointer deref in devtmpfsd()

2020-01-22T14:28:14Z

After complete(&setup_done), devtmpfs_init proceeds and may actually return, invalidating the *err pointer, before devtmpfsd() proceeds to reading back *err. This is of course completely theoretical since the error conditions never trigger in practice, and even if they did, nobody cares about the exit value from a kernel thread, so it doesn't matter if we happen to read back some garbage from some other stack frame. Still, this isn't a pattern that should be copy-pasted, so fix it. Signed-off-by: Rasmus Villemoes Link: https://lore.kernel.org/r/20200115184154.3492-2-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman

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