[PATCH 0/2] quota: Add mountpath based quota support

[PATCH 0/2] quota: Add mountpath based quota support

[Sascha Hauer]

Current quotactl syscall uses a path to a block device to specify the
filesystem to work on which makes it unsuitable for filesystems that
do not have a block device. This series adds a new syscall quotactl_path()
which replaces the path to the block device with a mountpath, but otherwise
behaves like original quotactl.

This is done to add quota support to UBIFS. UBIFS quota support has been
posted several times with different approaches to put the mountpath into
the existing quotactl() syscall until it has been suggested to make it a
new syscall instead, so here it is.

I'm not posting the full UBIFS quota series here as it remains unchanged
and I'd like to get feedback to the new syscall first. For those interested
the most recent series can be found here: https://lwn.net/Articles/810463/

Sascha

Sascha Hauer (2):
  quota: Add mountpath based quota support
  quota: wire up quotactl_path

 arch/alpha/kernel/syscalls/syscall.tbl      |  1 +
 arch/arm/tools/syscall.tbl                  |  1 +
 arch/arm64/include/asm/unistd.h             |  2 +-
 arch/arm64/include/asm/unistd32.h           |  2 +
 arch/ia64/kernel/syscalls/syscall.tbl       |  1 +
 arch/m68k/kernel/syscalls/syscall.tbl       |  1 +
 arch/microblaze/kernel/syscalls/syscall.tbl |  1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   |  1 +
 arch/parisc/kernel/syscalls/syscall.tbl     |  1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    |  1 +
 arch/s390/kernel/syscalls/syscall.tbl       |  1 +
 arch/sh/kernel/syscalls/syscall.tbl         |  1 +
 arch/sparc/kernel/syscalls/syscall.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_32.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_64.tbl      |  1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     |  1 +
 fs/quota/quota.c                            | 77 +++++++++++++++++++++
 include/linux/syscalls.h                    |  2 +
 include/uapi/asm-generic/unistd.h           |  4 +-
 kernel/sys_ni.c                             |  1 +
 22 files changed, 102 insertions(+), 2 deletions(-)

-- 
2.20.1

[PATCH 1/2] quota: Add mountpath based quota support

[Sascha Hauer]

Add syscall quotactl_path, a variant of quotactl which allows to specify
the mountpath instead of a path of to a block device.

The quotactl syscall expects a path to the mounted block device to
specify the filesystem to work on. This limits usage to filesystems
which actually have a block device. quotactl_path replaces the path
to the block device with a path where the filesystem is mounted at.

The global Q_SYNC command to sync all filesystems is not supported for
this new syscall, otherwise quotactl_path behaves like quotactl.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 fs/quota/quota.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 6d16b2be5ac4..9ac09e128686 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -17,6 +17,7 @@
 #include <linux/capability.h>
 #include <linux/quotaops.h>
 #include <linux/types.h>
+#include <linux/mount.h>
 #include <linux/writeback.h>
 #include <linux/nospec.h>
 #include "compat.h"
@@ -968,3 +969,79 @@ SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
 		path_put(pathp);
 	return ret;
 }
+
+SYSCALL_DEFINE4(quotactl_path, unsigned int, cmd, const char __user *,
+		mountpoint, qid_t, id, void __user *, addr)
+{
+	uint cmds, type;
+	struct super_block *sb = NULL;
+	struct path path, *pathp = NULL;
+	struct path mountpath;
+	bool excl = false, thawed = false;
+	int ret;
+
+	cmds = cmd >> SUBCMDSHIFT;
+	type = cmd & SUBCMDMASK;
+
+	if (type >= MAXQUOTAS)
+		return -EINVAL;
+
+	if (!mountpoint)
+		return -ENODEV;
+
+	/*
+	 * Path for quotaon has to be resolved before grabbing superblock
+	 * because that gets s_umount sem which is also possibly needed by path
+	 * resolution (think about autofs) and thus deadlocks could arise.
+	 */
+	if (cmds == Q_QUOTAON) {
+		ret = user_path_at(AT_FDCWD, addr,
+				   LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &path);
+		if (ret)
+			pathp = ERR_PTR(ret);
+		else
+			pathp = &path;
+	}
+
+	ret = user_path_at(AT_FDCWD, mountpoint,
+			     LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &mountpath);
+	if (ret)
+		goto out;
+
+	if (quotactl_cmd_onoff(cmds)) {
+		excl = true;
+		thawed = true;
+	} else if (quotactl_cmd_write(cmds)) {
+		thawed = true;
+	}
+
+	if (thawed) {
+		ret = mnt_want_write(mountpath.mnt);
+		if (ret)
+			goto out1;
+	}
+
+	sb = mountpath.dentry->d_inode->i_sb;
+
+	if (excl)
+		down_write(&sb->s_umount);
+	else
+		down_read(&sb->s_umount);
+
+	ret = do_quotactl(sb, type, cmds, id, addr, pathp);
+
+	if (excl)
+		up_write(&sb->s_umount);
+	else
+		up_read(&sb->s_umount);
+
+	if (thawed)
+		mnt_drop_write(mountpath.mnt);
+out1:
+	path_put(&mountpath);
+
+out:
+	if (pathp && !IS_ERR(pathp))
+		path_put(pathp);
+	return ret;
+}
-- 
2.20.1

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Christoph Hellwig]

> +	uint cmds, type;
> +	struct super_block *sb = NULL;

I don't think sb needs the NULL initialization.

> +	struct path path, *pathp = NULL;
> +	struct path mountpath;
> +	bool excl = false, thawed = false;
> +	int ret;
> +
> +	cmds = cmd >> SUBCMDSHIFT;
> +	type = cmd & SUBCMDMASK;

Personal pet peeve: it would be nice to just initialize cmds and
type on their declaration line, or while we're at it declutter
this a bit and remove the separate cmds variable:

	unsigned int type = cmd & SUBCMDMASK;


	cmd >>= SUBCMDSHIFT;

> +	/*
> +	 * Path for quotaon has to be resolved before grabbing superblock
> +	 * because that gets s_umount sem which is also possibly needed by path
> +	 * resolution (think about autofs) and thus deadlocks could arise.
> +	 */
> +	if (cmds == Q_QUOTAON) {
> +		ret = user_path_at(AT_FDCWD, addr,
> +				   LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &path);
> +		if (ret)
> +			pathp = ERR_PTR(ret);
> +		else
> +			pathp = &path;
> +	}
> +
> +	ret = user_path_at(AT_FDCWD, mountpoint,
> +			     LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &mountpath);
> +	if (ret)
> +		goto out;

I don't think we need two path lookups here, we can path the same path
to the command for quotaon.


> +	if (quotactl_cmd_onoff(cmds)) {
> +		excl = true;
> +		thawed = true;
> +	} else if (quotactl_cmd_write(cmds)) {
> +		thawed = true;
> +	}
> +
> +	if (thawed) {
> +		ret = mnt_want_write(mountpath.mnt);
> +		if (ret)
> +			goto out1;
> +	}
> +
> +	sb = mountpath.dentry->d_inode->i_sb;
> +
> +	if (excl)
> +		down_write(&sb->s_umount);
> +	else
> +		down_read(&sb->s_umount);

Given how cheap quotactl_cmd_onoff and quotactl_cmd_write are we
could probably simplify this down do:

	if (quotactl_cmd_write(cmd)) {
		ret = mnt_want_write(path.mnt);
		if (ret)
			goto out1;
	}
	if (quotactl_cmd_onoff(cmd))
		down_write(&sb->s_umount);
	else
		down_read(&sb->s_umount);

and duplicate the checks after the do_quotactl call.

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Jan Kara]

On Thu 28-01-21 14:35:52, Christoph Hellwig wrote:
> > +	struct path path, *pathp = NULL;
> > +	struct path mountpath;
> > +	bool excl = false, thawed = false;
> > +	int ret;
> > +
> > +	cmds = cmd >> SUBCMDSHIFT;
> > +	type = cmd & SUBCMDMASK;
> 
> Personal pet peeve: it would be nice to just initialize cmds and
> type on their declaration line, or while we're at it declutter
> this a bit and remove the separate cmds variable:
> 
> 	unsigned int type = cmd & SUBCMDMASK;
> 
> 	cmd >>= SUBCMDSHIFT;

Yeah, whatever :)

> > +	/*
> > +	 * Path for quotaon has to be resolved before grabbing superblock
> > +	 * because that gets s_umount sem which is also possibly needed by path
> > +	 * resolution (think about autofs) and thus deadlocks could arise.
> > +	 */
> > +	if (cmds == Q_QUOTAON) {
> > +		ret = user_path_at(AT_FDCWD, addr,
> > +				   LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &path);
> > +		if (ret)
> > +			pathp = ERR_PTR(ret);
> > +		else
> > +			pathp = &path;
> > +	}
> > +
> > +	ret = user_path_at(AT_FDCWD, mountpoint,
> > +			     LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &mountpath);
> > +	if (ret)
> > +		goto out;
> 
> I don't think we need two path lookups here, we can path the same path
> to the command for quotaon.

Hum, let me think out loud. The path we pass to Q_QUOTAON is a path to
quota file - unless the filesystem stores quota in hidden files in which
case this argument is just ignored. You're right we could require that
specifically for Q_QUOTAON, the mountpoint path would actually need to
point to the quota file if it is relevant, otherwise anywhere in the
appropriate filesystem. We don't allow quota file to reside on a different
filesystem (for a past decade or so) so it should work fine.

So the only problem I have is whether requiring the mountpoint argument to
point quota file for Q_QUOTAON isn't going to be somewhat confusing to
users. At the very least it would require some careful explanation in the
manpage to explain the difference between quotactl_path() and quotactl()
in this regard. But is saving the second path for Q_QUOTAON really worth the
bother?

> > +	if (quotactl_cmd_onoff(cmds)) {
> > +		excl = true;
> > +		thawed = true;
> > +	} else if (quotactl_cmd_write(cmds)) {
> > +		thawed = true;
> > +	}
> > +
> > +	if (thawed) {
> > +		ret = mnt_want_write(mountpath.mnt);
> > +		if (ret)
> > +			goto out1;
> > +	}
> > +
> > +	sb = mountpath.dentry->d_inode->i_sb;
> > +
> > +	if (excl)
> > +		down_write(&sb->s_umount);
> > +	else
> > +		down_read(&sb->s_umount);
> 
> Given how cheap quotactl_cmd_onoff and quotactl_cmd_write are we
> could probably simplify this down do:
> 
> 	if (quotactl_cmd_write(cmd)) {

This needs to be (quotactl_cmd_write(cmd) || quotactl_cmd_onoff(cmd)).
Otherwise I agree what you suggest is somewhat more readable given how
small the function is.

> 		ret = mnt_want_write(path.mnt);
> 		if (ret)
> 			goto out1;
> 	}
> 	if (quotactl_cmd_onoff(cmd))
> 		down_write(&sb->s_umount);
> 	else
> 		down_read(&sb->s_umount);
> 
> and duplicate the checks after the do_quotactl call.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Christoph Hellwig]

On Tue, Feb 02, 2021 at 07:02:41PM +0100, Jan Kara wrote:
> Hum, let me think out loud. The path we pass to Q_QUOTAON is a path to
> quota file - unless the filesystem stores quota in hidden files in which
> case this argument is just ignored. You're right we could require that
> specifically for Q_QUOTAON, the mountpoint path would actually need to
> point to the quota file if it is relevant, otherwise anywhere in the
> appropriate filesystem. We don't allow quota file to reside on a different
> filesystem (for a past decade or so) so it should work fine.
> 
> So the only problem I have is whether requiring the mountpoint argument to
> point quota file for Q_QUOTAON isn't going to be somewhat confusing to
> users. At the very least it would require some careful explanation in the
> manpage to explain the difference between quotactl_path() and quotactl()
> in this regard. But is saving the second path for Q_QUOTAON really worth the
> bother?

I find the doubled path argument a really horrible API, so I'd pretty
strongly prefer to avoid that.

> > Given how cheap quotactl_cmd_onoff and quotactl_cmd_write are we
> > could probably simplify this down do:
> > 
> > 	if (quotactl_cmd_write(cmd)) {
> 
> This needs to be (quotactl_cmd_write(cmd) || quotactl_cmd_onoff(cmd)).
> Otherwise I agree what you suggest is somewhat more readable given how
> small the function is.

The way I read quotactl_cmd_write, it only special cases a few commands
and returns 0 there, so we should not need the extra quotactl_cmd_onoff
call, as all those commands are not explicitly listed.

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Jan Kara]

On Thu 04-02-21 07:34:14, Christoph Hellwig wrote:
> On Tue, Feb 02, 2021 at 07:02:41PM +0100, Jan Kara wrote:
> > Hum, let me think out loud. The path we pass to Q_QUOTAON is a path to
> > quota file - unless the filesystem stores quota in hidden files in which
> > case this argument is just ignored. You're right we could require that
> > specifically for Q_QUOTAON, the mountpoint path would actually need to
> > point to the quota file if it is relevant, otherwise anywhere in the
> > appropriate filesystem. We don't allow quota file to reside on a different
> > filesystem (for a past decade or so) so it should work fine.
> > 
> > So the only problem I have is whether requiring the mountpoint argument to
> > point quota file for Q_QUOTAON isn't going to be somewhat confusing to
> > users. At the very least it would require some careful explanation in the
> > manpage to explain the difference between quotactl_path() and quotactl()
> > in this regard. But is saving the second path for Q_QUOTAON really worth the
> > bother?
> 
> I find the doubled path argument a really horrible API, so I'd pretty
> strongly prefer to avoid that.

Honestly, I don't understand why is it so horrible. The paths point to
different things... The first path identifies the filesystem to operate on,
the second path identifies the file which contains quota accounting data.
In the ancient times, the file with quota accounting data could even be
stored on a different filesystem (these were still times when filesystem
metadata journalling was a new thing - like late 90's).  But later I just
disallowed that because it was not very useful (and luckily even used) and
just complicated matters.
 
Anyway, back to 2021 :). What I find somewhat confusing about a single path
for Q_QUOTAON is that for any other quotactl, any path on the filesystem is
fine. Similarly if quota data is stored in the hidden file, any path on the
filesystem is fine. It is only for Q_QUOTAON on a filesystem where quota
data is stored in a normal file, where we suddently require that the path
has to point to it.

Now quota data stored in a normal file is a setup we try to deprecate
anyway so another option is to just leave quotactl_path() only for those
setups where quota metadata is managed by the filesystem so we don't need
to pass quota files to Q_QUOTAON?

> > > Given how cheap quotactl_cmd_onoff and quotactl_cmd_write are we
> > > could probably simplify this down do:
> > > 
> > > 	if (quotactl_cmd_write(cmd)) {
> > 
> > This needs to be (quotactl_cmd_write(cmd) || quotactl_cmd_onoff(cmd)).
> > Otherwise I agree what you suggest is somewhat more readable given how
> > small the function is.
> 
> The way I read quotactl_cmd_write, it only special cases a few commands
> and returns 0 there, so we should not need the extra quotactl_cmd_onoff
> call, as all those commands are not explicitly listed.

Right, sorry, I was mistaken.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Christoph Hellwig]

On Thu, Feb 04, 2021 at 01:53:50PM +0100, Jan Kara wrote:
> Now quota data stored in a normal file is a setup we try to deprecate
> anyway so another option is to just leave quotactl_path() only for those
> setups where quota metadata is managed by the filesystem so we don't need
> to pass quota files to Q_QUOTAON?

I'd be perfectly fine with that.

Re: [PATCH 1/2] quota: Add mountpath based quota support

[Jan Kara]

On Tue 09-02-21 08:51:01, Christoph Hellwig wrote:
> On Thu, Feb 04, 2021 at 01:53:50PM +0100, Jan Kara wrote:
> > Now quota data stored in a normal file is a setup we try to deprecate
> > anyway so another option is to just leave quotactl_path() only for those
> > setups where quota metadata is managed by the filesystem so we don't need
> > to pass quota files to Q_QUOTAON?
> 
> I'd be perfectly fine with that.

OK, then this looks like the best way forward to me. We can always extend
the quotactl_path() syscall later if we find this is problematic for some
real usecases.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

[PATCH 2/2] quota: wire up quotactl_path

[Sascha Hauer]

Wire up the quotactl_path syscall added in the previous patch.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/alpha/kernel/syscalls/syscall.tbl      | 1 +
 arch/arm/tools/syscall.tbl                  | 1 +
 arch/arm64/include/asm/unistd.h             | 2 +-
 arch/arm64/include/asm/unistd32.h           | 2 ++
 arch/ia64/kernel/syscalls/syscall.tbl       | 1 +
 arch/m68k/kernel/syscalls/syscall.tbl       | 1 +
 arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   | 1 +
 arch/parisc/kernel/syscalls/syscall.tbl     | 1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    | 1 +
 arch/s390/kernel/syscalls/syscall.tbl       | 1 +
 arch/sh/kernel/syscalls/syscall.tbl         | 1 +
 arch/sparc/kernel/syscalls/syscall.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_32.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_64.tbl      | 1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     | 1 +
 include/linux/syscalls.h                    | 2 ++
 include/uapi/asm-generic/unistd.h           | 4 +++-
 kernel/sys_ni.c                             | 1 +
 21 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index a6617067dbe6..3fe90880c821 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -481,3 +481,4 @@
 549	common	faccessat2			sys_faccessat2
 550	common	process_madvise			sys_process_madvise
 551	common	epoll_pwait2			sys_epoll_pwait2
+552	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index 20e1170e2e0a..a62509df217f 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -455,3 +455,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 86a9d7b3eabe..949788f5ba40 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -38,7 +38,7 @@
 #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE + 5)
 #define __ARM_NR_COMPAT_END		(__ARM_NR_COMPAT_BASE + 0x800)
 
-#define __NR_compat_syscalls		442
+#define __NR_compat_syscalls		443
 #endif
 
 #define __ARCH_WANT_SYS_CLONE
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index cccfbbefbf95..734c254ca1b6 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -891,6 +891,8 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
 __SYSCALL(__NR_process_madvise, sys_process_madvise)
 #define __NR_epoll_pwait2 441
 __SYSCALL(__NR_epoll_pwait2, compat_sys_epoll_pwait2)
+#define __NR_quotactl_path 442
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 /*
  * Please add new compat syscalls above this comment and update
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
index bfc00f2bd437..4758a22a4d80 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -362,3 +362,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index 7fe4e45c864c..b9072d2f1fdc 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -441,3 +441,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index a522adf194ab..95e0cb59e8c1 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -447,3 +447,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 0f03ad223f33..027fe0351e66 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -380,3 +380,4 @@
 439	n32	faccessat2			sys_faccessat2
 440	n32	process_madvise			sys_process_madvise
 441	n32	epoll_pwait2			compat_sys_epoll_pwait2
+442	n32	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 91649690b52f..f4bddccab043 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -356,3 +356,4 @@
 439	n64	faccessat2			sys_faccessat2
 440	n64	process_madvise			sys_process_madvise
 441	n64	epoll_pwait2			sys_epoll_pwait2
+442	n64	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 4bad0c40aed6..bc2f3ad1de87 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -429,3 +429,4 @@
 439	o32	faccessat2			sys_faccessat2
 440	o32	process_madvise			sys_process_madvise
 441	o32	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	o32	quotactl_path			sys_quotactl_path
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 6bcc31966b44..80a4b6dbae77 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -439,3 +439,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index f744eb5cba88..29a706828330 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -531,3 +531,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index d443423495e5..6ed53d992736 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -444,3 +444,4 @@
 439  common	faccessat2		sys_faccessat2			sys_faccessat2
 440  common	process_madvise		sys_process_madvise		sys_process_madvise
 441  common	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
+442  common	quotactl_path		sys_quotactl_path
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index 9df40ac0ebc0..f8488ad641b6 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -444,3 +444,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 40d8c7cd8298..211d7269246b 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -487,3 +487,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 874aeacde2dd..deb7650cfc88 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -446,3 +446,4 @@
 439	i386	faccessat2		sys_faccessat2
 440	i386	process_madvise		sys_process_madvise
 441	i386	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path		sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 78672124d28b..cdbfb67852e6 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -363,6 +363,7 @@
 439	common	faccessat2		sys_faccessat2
 440	common	process_madvise		sys_process_madvise
 441	common	epoll_pwait2		sys_epoll_pwait2
+442	common	quotactl_path		sys_quotactl_path
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 46116a28eeed..b434eda5653a 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -412,3 +412,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 7688bc983de5..2e1bf7c2165f 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -482,6 +482,8 @@ asmlinkage long sys_pipe2(int __user *fildes, int flags);
 /* fs/quota.c */
 asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special,
 				qid_t id, void __user *addr);
+asmlinkage long sys_quotactl_path(unsigned int cmd, const char __user *mountpoint,
+				  qid_t id, void __user *addr);
 
 /* fs/readdir.c */
 asmlinkage long sys_getdents64(unsigned int fd,
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 728752917785..dad876b86488 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -861,9 +861,11 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
 __SYSCALL(__NR_process_madvise, sys_process_madvise)
 #define __NR_epoll_pwait2 441
 __SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2)
+#define __NR_quotactl_path 442
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 #undef __NR_syscalls
-#define __NR_syscalls 442
+#define __NR_syscalls 443
 
 /*
  * 32 bit systems traditionally used different
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 19aa806890d5..d24431782414 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -99,6 +99,7 @@ COND_SYSCALL(flock);
 
 /* fs/quota.c */
 COND_SYSCALL(quotactl);
+COND_SYSCALL(quotactl_path);
 
 /* fs/readdir.c */
 
-- 
2.20.1

[PATCH] quotactl.2: Add documentation for quotactl_path()

[Sascha Hauer]

Expand the quotactl.2 manpage with a description for quotactl_path()
that takes a mountpoint path instead of a path to a block device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 man2/quotactl.2      | 19 +++++++++++++++++--
 man2/quotactl_path.2 |  1 +
 2 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 man2/quotactl_path.2

diff --git a/man2/quotactl.2 b/man2/quotactl.2
index 7869c64ea..08f2ba02f 100644
--- a/man2/quotactl.2
+++ b/man2/quotactl.2
@@ -34,6 +34,8 @@ quotactl \- manipulate disk quotas
 .PP
 .BI "int quotactl(int " cmd ", const char *" special ", int " id \
 ", caddr_t " addr );
+.BI "int quotactl_path(int " cmd ", const char *" mountpoint ", int " id \
+", caddr_t " addr );
 .fi
 .SH DESCRIPTION
 The quota system can be used to set per-user, per-group, and per-project limits
@@ -48,7 +50,11 @@ after this, the soft limit counts as a hard limit.
 .PP
 The
 .BR quotactl ()
-call manipulates disk quotas.
+and
+.BR quotactl_path ()
+calls manipulate disk quotas. The difference between both functions is the way
+how the filesystem being manipulated is specified, see description of the arguments
+below.
 The
 .I cmd
 argument indicates a command to be applied to the user or
@@ -75,10 +81,19 @@ value is described below.
 .PP
 The
 .I special
-argument is a pointer to a null-terminated string containing the pathname
+argument to
+.BR quotactl ()
+is a pointer to a null-terminated string containing the pathname
 of the (mounted) block special device for the filesystem being manipulated.
 .PP
 The
+.I mountpoint
+argument to
+.BR quotactl_path ()
+is a pointer to a null-terminated string containing the pathname
+of the mountpoint for the filesystem being manipulated.
+.PP
+The
 .I addr
 argument is the address of an optional, command-specific, data structure
 that is copied in or out of the system.
diff --git a/man2/quotactl_path.2 b/man2/quotactl_path.2
new file mode 100644
index 000000000..5f63187c6
--- /dev/null
+++ b/man2/quotactl_path.2
@@ -0,0 +1 @@
+.so man2/quotactl.2
-- 
2.20.1

[PATCH v2 0/2] quota: Add mountpath based quota support

[Sascha Hauer]

Current quotactl syscall uses a path to a block device to specify the
filesystem to work on which makes it unsuitable for filesystems that
do not have a block device. This series adds a new syscall quotactl_path()
which replaces the path to the block device with a mountpath, but otherwise
behaves like original quotactl.

This is done to add quota support to UBIFS. UBIFS quota support has been
posted several times with different approaches to put the mountpath into
the existing quotactl() syscall until it has been suggested to make it a
new syscall instead, so here it is.

I'm not posting the full UBIFS quota series here as it remains unchanged
and I'd like to get feedback to the new syscall first. For those interested
the most recent series can be found here: https://lwn.net/Articles/810463/

Changes since (implicit) v1:
- Ignore second path argument to Q_QUOTAON. With this quotactl_path() can
  only do the Q_QUOTAON operation on filesystems which use hidden inodes
  for quota metadata storage
- Drop unnecessary quotactl_cmd_onoff() check

Sascha Hauer (2):
  quota: Add mountpath based quota support
  quota: wire up quotactl_path

 arch/alpha/kernel/syscalls/syscall.tbl      |  1 +
 arch/arm/tools/syscall.tbl                  |  1 +
 arch/arm64/include/asm/unistd.h             |  2 +-
 arch/arm64/include/asm/unistd32.h           |  2 +
 arch/ia64/kernel/syscalls/syscall.tbl       |  1 +
 arch/m68k/kernel/syscalls/syscall.tbl       |  1 +
 arch/microblaze/kernel/syscalls/syscall.tbl |  1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   |  1 +
 arch/parisc/kernel/syscalls/syscall.tbl     |  1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    |  1 +
 arch/s390/kernel/syscalls/syscall.tbl       |  1 +
 arch/sh/kernel/syscalls/syscall.tbl         |  1 +
 arch/sparc/kernel/syscalls/syscall.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_32.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_64.tbl      |  1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     |  1 +
 fs/quota/quota.c                            | 49 +++++++++++++++++++++
 include/linux/syscalls.h                    |  2 +
 include/uapi/asm-generic/unistd.h           |  4 +-
 kernel/sys_ni.c                             |  1 +
 22 files changed, 74 insertions(+), 2 deletions(-)

-- 
2.20.1

[PATCH 2/2] quota: wire up quotactl_path

[Sascha Hauer]

Wire up the quotactl_path syscall added in the previous patch.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/alpha/kernel/syscalls/syscall.tbl      | 1 +
 arch/arm/tools/syscall.tbl                  | 1 +
 arch/arm64/include/asm/unistd.h             | 2 +-
 arch/arm64/include/asm/unistd32.h           | 2 ++
 arch/ia64/kernel/syscalls/syscall.tbl       | 1 +
 arch/m68k/kernel/syscalls/syscall.tbl       | 1 +
 arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   | 1 +
 arch/parisc/kernel/syscalls/syscall.tbl     | 1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    | 1 +
 arch/s390/kernel/syscalls/syscall.tbl       | 1 +
 arch/sh/kernel/syscalls/syscall.tbl         | 1 +
 arch/sparc/kernel/syscalls/syscall.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_32.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_64.tbl      | 1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     | 1 +
 include/linux/syscalls.h                    | 2 ++
 include/uapi/asm-generic/unistd.h           | 4 +++-
 kernel/sys_ni.c                             | 1 +
 21 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index a6617067dbe6..3fe90880c821 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -481,3 +481,4 @@
 549	common	faccessat2			sys_faccessat2
 550	common	process_madvise			sys_process_madvise
 551	common	epoll_pwait2			sys_epoll_pwait2
+552	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index 20e1170e2e0a..a62509df217f 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -455,3 +455,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 86a9d7b3eabe..949788f5ba40 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -38,7 +38,7 @@
 #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE + 5)
 #define __ARM_NR_COMPAT_END		(__ARM_NR_COMPAT_BASE + 0x800)
 
-#define __NR_compat_syscalls		442
+#define __NR_compat_syscalls		443
 #endif
 
 #define __ARCH_WANT_SYS_CLONE
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index cccfbbefbf95..734c254ca1b6 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -891,6 +891,8 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
 __SYSCALL(__NR_process_madvise, sys_process_madvise)
 #define __NR_epoll_pwait2 441
 __SYSCALL(__NR_epoll_pwait2, compat_sys_epoll_pwait2)
+#define __NR_quotactl_path 442
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 /*
  * Please add new compat syscalls above this comment and update
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
index bfc00f2bd437..4758a22a4d80 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -362,3 +362,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index 7fe4e45c864c..b9072d2f1fdc 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -441,3 +441,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index a522adf194ab..95e0cb59e8c1 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -447,3 +447,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 0f03ad223f33..027fe0351e66 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -380,3 +380,4 @@
 439	n32	faccessat2			sys_faccessat2
 440	n32	process_madvise			sys_process_madvise
 441	n32	epoll_pwait2			compat_sys_epoll_pwait2
+442	n32	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 91649690b52f..f4bddccab043 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -356,3 +356,4 @@
 439	n64	faccessat2			sys_faccessat2
 440	n64	process_madvise			sys_process_madvise
 441	n64	epoll_pwait2			sys_epoll_pwait2
+442	n64	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 4bad0c40aed6..bc2f3ad1de87 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -429,3 +429,4 @@
 439	o32	faccessat2			sys_faccessat2
 440	o32	process_madvise			sys_process_madvise
 441	o32	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	o32	quotactl_path			sys_quotactl_path
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 6bcc31966b44..80a4b6dbae77 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -439,3 +439,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index f744eb5cba88..29a706828330 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -531,3 +531,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index d443423495e5..6ed53d992736 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -444,3 +444,4 @@
 439  common	faccessat2		sys_faccessat2			sys_faccessat2
 440  common	process_madvise		sys_process_madvise		sys_process_madvise
 441  common	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
+442  common	quotactl_path		sys_quotactl_path
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index 9df40ac0ebc0..f8488ad641b6 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -444,3 +444,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 40d8c7cd8298..211d7269246b 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -487,3 +487,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 874aeacde2dd..deb7650cfc88 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -446,3 +446,4 @@
 439	i386	faccessat2		sys_faccessat2
 440	i386	process_madvise		sys_process_madvise
 441	i386	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
+442	common	quotactl_path		sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 78672124d28b..cdbfb67852e6 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -363,6 +363,7 @@
 439	common	faccessat2		sys_faccessat2
 440	common	process_madvise		sys_process_madvise
 441	common	epoll_pwait2		sys_epoll_pwait2
+442	common	quotactl_path		sys_quotactl_path
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 46116a28eeed..b434eda5653a 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -412,3 +412,4 @@
 439	common	faccessat2			sys_faccessat2
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
+442	common	quotactl_path			sys_quotactl_path
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 7688bc983de5..2e1bf7c2165f 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -482,6 +482,8 @@ asmlinkage long sys_pipe2(int __user *fildes, int flags);
 /* fs/quota.c */
 asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special,
 				qid_t id, void __user *addr);
+asmlinkage long sys_quotactl_path(unsigned int cmd, const char __user *mountpoint,
+				  qid_t id, void __user *addr);
 
 /* fs/readdir.c */
 asmlinkage long sys_getdents64(unsigned int fd,
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 728752917785..dad876b86488 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -861,9 +861,11 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
 __SYSCALL(__NR_process_madvise, sys_process_madvise)
 #define __NR_epoll_pwait2 441
 __SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2)
+#define __NR_quotactl_path 442
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 #undef __NR_syscalls
-#define __NR_syscalls 442
+#define __NR_syscalls 443
 
 /*
  * 32 bit systems traditionally used different
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 19aa806890d5..d24431782414 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -99,6 +99,7 @@ COND_SYSCALL(flock);
 
 /* fs/quota.c */
 COND_SYSCALL(quotactl);
+COND_SYSCALL(quotactl_path);
 
 /* fs/readdir.c */
 
-- 
2.20.1

Re: [PATCH 2/2] quota: wire up quotactl_path

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH 2/2] quota: wire up quotactl_path

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 15914 bytes --]

Hi Sascha,

I love your patch! Perhaps something to improve:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on tip/x86/asm m68k/for-next hp-parisc/for-next powerpc/next s390/features linus/master v5.11-rc7]
[cannot apply to sparc-next/master sparc/master xtensa/for_next next-20210211]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210211-233912
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: x86_64-randconfig-a013-20210209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/0fa8489f958d6ec34215930a8d1a2d4b6644fea3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210211-233912
        git checkout 0fa8489f958d6ec34215930a8d1a2d4b6644fea3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/x86/entry/syscall_32.c:13:
   ./arch/x86/include/generated/asm/syscalls_32.h:830:18: error: expected parameter declarator
   __SYSCALL_COMMON(442, sys_quotactl_path)
                    ^
   ./arch/x86/include/generated/asm/syscalls_32.h:830:18: error: expected ')'
   ./arch/x86/include/generated/asm/syscalls_32.h:830:17: note: to match this '('
   __SYSCALL_COMMON(442, sys_quotactl_path)
                   ^
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:1: warning: declaration specifier missing, defaulting to 'int'
   __SYSCALL_COMMON(442, sys_quotactl_path)
   ^
   int
   ./arch/x86/include/generated/asm/syscalls_32.h:830:17: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
   __SYSCALL_COMMON(442, sys_quotactl_path)
                   ^
                                          void
   ./arch/x86/include/generated/asm/syscalls_32.h:830:41: error: expected ';' after top level declarator
   __SYSCALL_COMMON(442, sys_quotactl_path)
                                           ^
                                           ;
   In file included from arch/x86/entry/syscall_32.c:24:
   ./arch/x86/include/generated/asm/syscalls_32.h:830:23: error: use of undeclared identifier 'sys_quotactl_path'
   __SYSCALL_COMMON(442, sys_quotactl_path)
                         ^
   1 warning and 5 errors generated.
--
   kernel/sys_ni.c:88:1: warning: no previous prototype for function '__x64_sys_flock' [-Wmissing-prototypes]
   COND_SYSCALL(flock);
   ^
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:225:1: note: expanded from here
   __x64_sys_flock
   ^
   kernel/sys_ni.c:88:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:88:1: warning: no previous prototype for function '__ia32_sys_flock' [-Wmissing-prototypes]
   COND_SYSCALL(flock);
   ^
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:229:1: note: expanded from here
   __ia32_sys_flock
   ^
   kernel/sys_ni.c:88:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:101:1: warning: no previous prototype for function '__x64_sys_quotactl' [-Wmissing-prototypes]
   COND_SYSCALL(quotactl);
   ^
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:233:1: note: expanded from here
   __x64_sys_quotactl
   ^
   kernel/sys_ni.c:101:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:101:1: warning: no previous prototype for function '__ia32_sys_quotactl' [-Wmissing-prototypes]
   COND_SYSCALL(quotactl);
   ^
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:237:1: note: expanded from here
   __ia32_sys_quotactl
   ^
   kernel/sys_ni.c:101:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
>> kernel/sys_ni.c:102:1: warning: no previous prototype for function '__x64_sys_quotactl_path' [-Wmissing-prototypes]
   COND_SYSCALL(quotactl_path);
   ^
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:241:1: note: expanded from here
   __x64_sys_quotactl_path
   ^
   kernel/sys_ni.c:102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
>> kernel/sys_ni.c:102:1: warning: no previous prototype for function '__ia32_sys_quotactl_path' [-Wmissing-prototypes]
   COND_SYSCALL(quotactl_path);
   ^
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:245:1: note: expanded from here
   __ia32_sys_quotactl_path
   ^
   kernel/sys_ni.c:102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:113:1: warning: no previous prototype for function '__x64_sys_signalfd4' [-Wmissing-prototypes]
   COND_SYSCALL(signalfd4);
   ^
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:249:1: note: expanded from here
   __x64_sys_signalfd4
   ^
   kernel/sys_ni.c:113:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL'
           __X64_COND_SYSCALL(name)                                        \
           ^
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL'
           __COND_SYSCALL(x64, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:113:1: warning: no previous prototype for function '__ia32_sys_signalfd4' [-Wmissing-prototypes]
   COND_SYSCALL(signalfd4);
   ^
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:253:1: note: expanded from here
   __ia32_sys_signalfd4
   ^
   kernel/sys_ni.c:113:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL'
           __IA32_COND_SYSCALL(name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL'
           __COND_SYSCALL(ia32, sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:114:1: warning: no previous prototype for function '__ia32_compat_sys_signalfd4' [-Wmissing-prototypes]
   COND_SYSCALL_COMPAT(signalfd4);
   ^
   arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT'
           __IA32_COMPAT_COND_SYSCALL(name)                                \
           ^
   arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL'
           __COND_SYSCALL(ia32, compat_sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                       ^
   <scratch space>:257:1: note: expanded from here
   __ia32_compat_sys_signalfd4
   ^
   kernel/sys_ni.c:114:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT'
           __IA32_COMPAT_COND_SYSCALL(name)                                \
           ^
   arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL'
           __COND_SYSCALL(ia32, compat_sys_##name)
           ^
   arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL'
           __weak long __##abi##_##name(const struct pt_regs *__unused)    \
                  ^
   kernel/sys_ni.c:123:1: warning: no previous prototype for function '__x64_sys_timerfd_create' [-Wmissing-prototypes]


vim +/__x64_sys_quotactl_path +102 kernel/sys_ni.c

    99	
   100	/* fs/quota.c */
   101	COND_SYSCALL(quotactl);
 > 102	COND_SYSCALL(quotactl_path);
   103	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 36960 bytes --]

Re: [PATCH 2/2] quota: wire up quotactl_path

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 3275 bytes --]

Hi Sascha,

I love your patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on tip/x86/asm m68k/for-next hp-parisc/for-next powerpc/next s390/features linus/master v5.11-rc7]
[cannot apply to sparc-next/master sparc/master xtensa/for_next next-20210211]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210211-233912
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: x86_64-randconfig-a013-20210209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/0fa8489f958d6ec34215930a8d1a2d4b6644fea3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210211-233912
        git checkout 0fa8489f958d6ec34215930a8d1a2d4b6644fea3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/x86/entry/syscall_32.c:13:
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:18: error: expected parameter declarator
   __SYSCALL_COMMON(442, sys_quotactl_path)
                    ^
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:18: error: expected ')'
   ./arch/x86/include/generated/asm/syscalls_32.h:830:17: note: to match this '('
   __SYSCALL_COMMON(442, sys_quotactl_path)
                   ^
   ./arch/x86/include/generated/asm/syscalls_32.h:830:1: warning: declaration specifier missing, defaulting to 'int'
   __SYSCALL_COMMON(442, sys_quotactl_path)
   ^
   int
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:17: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
   __SYSCALL_COMMON(442, sys_quotactl_path)
                   ^
                                          void
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:41: error: expected ';' after top level declarator
   __SYSCALL_COMMON(442, sys_quotactl_path)
                                           ^
                                           ;
   In file included from arch/x86/entry/syscall_32.c:24:
>> ./arch/x86/include/generated/asm/syscalls_32.h:830:23: error: use of undeclared identifier 'sys_quotactl_path'
   __SYSCALL_COMMON(442, sys_quotactl_path)
                         ^
   1 warning and 5 errors generated.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 36960 bytes --]

[PATCH v3 0/2] quota: Add mountpath based quota support

[Sascha Hauer]

Current quotactl syscall uses a path to a block device to specify the
filesystem to work on which makes it unsuitable for filesystems that
do not have a block device. This series adds a new syscall quotactl_path()
which replaces the path to the block device with a mountpath, but otherwise
behaves like original quotactl.

This is done to add quota support to UBIFS. UBIFS quota support has been
posted several times with different approaches to put the mountpath into
the existing quotactl() syscall until it has been suggested to make it a
new syscall instead, so here it is.

I'm not posting the full UBIFS quota series here as it remains unchanged
and I'd like to get feedback to the new syscall first. For those interested
the most recent series can be found here: https://lwn.net/Articles/810463/

Changes since v2:
- Rebase on v5.12-rc1
- replace mountpath.dentry->d_inode->i_sb with mountpath.mnt->mnt_sb
- fix wrong macro usage in arch/x86/entry/syscalls/syscall_32.tbl
- +Cc linux-api@vger.kernel.org

Changes since (implicit) v1:
- Ignore second path argument to Q_QUOTAON. With this quotactl_path() can
  only do the Q_QUOTAON operation on filesystems which use hidden inodes
  for quota metadata storage
- Drop unnecessary quotactl_cmd_onoff() check

Sascha Hauer (2):
  quota: Add mountpath based quota support
  quota: wire up quotactl_path

 arch/alpha/kernel/syscalls/syscall.tbl      |  1 +
 arch/arm/tools/syscall.tbl                  |  1 +
 arch/arm64/include/asm/unistd.h             |  2 +-
 arch/arm64/include/asm/unistd32.h           |  2 +
 arch/ia64/kernel/syscalls/syscall.tbl       |  1 +
 arch/m68k/kernel/syscalls/syscall.tbl       |  1 +
 arch/microblaze/kernel/syscalls/syscall.tbl |  1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   |  1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   |  1 +
 arch/parisc/kernel/syscalls/syscall.tbl     |  1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    |  1 +
 arch/s390/kernel/syscalls/syscall.tbl       |  1 +
 arch/sh/kernel/syscalls/syscall.tbl         |  1 +
 arch/sparc/kernel/syscalls/syscall.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_32.tbl      |  1 +
 arch/x86/entry/syscalls/syscall_64.tbl      |  1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     |  1 +
 fs/quota/quota.c                            | 49 +++++++++++++++++++--
 include/linux/syscalls.h                    |  2 +
 include/uapi/asm-generic/unistd.h           |  4 +-
 kernel/sys_ni.c                             |  1 +
 22 files changed, 71 insertions(+), 5 deletions(-)

-- 
2.29.2

[PATCH 2/2] quota: wire up quotactl_path

[Sascha Hauer]

Wire up the quotactl_path syscall added in the previous patch.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/kernel/syscalls/syscall.tbl      | 1 +
 arch/arm/tools/syscall.tbl                  | 1 +
 arch/arm64/include/asm/unistd.h             | 2 +-
 arch/arm64/include/asm/unistd32.h           | 2 ++
 arch/ia64/kernel/syscalls/syscall.tbl       | 1 +
 arch/m68k/kernel/syscalls/syscall.tbl       | 1 +
 arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   | 1 +
 arch/mips/kernel/syscalls/syscall_o32.tbl   | 1 +
 arch/parisc/kernel/syscalls/syscall.tbl     | 1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    | 1 +
 arch/s390/kernel/syscalls/syscall.tbl       | 1 +
 arch/sh/kernel/syscalls/syscall.tbl         | 1 +
 arch/sparc/kernel/syscalls/syscall.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_32.tbl      | 1 +
 arch/x86/entry/syscalls/syscall_64.tbl      | 1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     | 1 +
 include/linux/syscalls.h                    | 2 ++
 include/uapi/asm-generic/unistd.h           | 4 +++-
 kernel/sys_ni.c                             | 1 +
 21 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index 02f0244e005c..c5f7e595adab 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -482,3 +482,4 @@
 550	common	process_madvise			sys_process_madvise
 551	common	epoll_pwait2			sys_epoll_pwait2
 552	common	mount_setattr			sys_mount_setattr
+553	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index dcc1191291a2..90cbe207cf3e 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -456,3 +456,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 949788f5ba40..d1f7d35f986e 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -38,7 +38,7 @@
 #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE + 5)
 #define __ARM_NR_COMPAT_END		(__ARM_NR_COMPAT_BASE + 0x800)
 
-#define __NR_compat_syscalls		443
+#define __NR_compat_syscalls		444
 #endif
 
 #define __ARCH_WANT_SYS_CLONE
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 3d874f624056..8361c5138e5f 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -893,6 +893,8 @@ __SYSCALL(__NR_process_madvise, sys_process_madvise)
 __SYSCALL(__NR_epoll_pwait2, compat_sys_epoll_pwait2)
 #define __NR_mount_setattr 442
 __SYSCALL(__NR_mount_setattr, sys_mount_setattr)
+#define __NR_quotactl_path 443
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 /*
  * Please add new compat syscalls above this comment and update
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
index d89231166e19..c072cd459bb5 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -363,3 +363,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index 72bde6707dd3..5e9f81073ff4 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -442,3 +442,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index d603a5ec9338..8e74d690c64d 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -448,3 +448,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 8fd8c1790941..6f397e56926f 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -381,3 +381,4 @@
 440	n32	process_madvise			sys_process_madvise
 441	n32	epoll_pwait2			compat_sys_epoll_pwait2
 442	n32	mount_setattr			sys_mount_setattr
+443	n32	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 169f21438065..ab85a357c4fa 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -357,3 +357,4 @@
 440	n64	process_madvise			sys_process_madvise
 441	n64	epoll_pwait2			sys_epoll_pwait2
 442	n64	mount_setattr			sys_mount_setattr
+443	n64	quotactl_path			sys_quotactl_path
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 090d29ca80ff..9c4cd2b40b38 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -430,3 +430,4 @@
 440	o32	process_madvise			sys_process_madvise
 441	o32	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
 442	o32	mount_setattr			sys_mount_setattr
+443	o32	quotactl_path			sys_quotactl_path
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 271a92519683..80fba3f7d47b 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -440,3 +440,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index 0b2480cf3e47..f66f9c9b9d6c 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -522,3 +522,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 3abef2144dac..4aeaa89fa774 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -445,3 +445,4 @@
 440  common	process_madvise		sys_process_madvise		sys_process_madvise
 441  common	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
 442  common	mount_setattr		sys_mount_setattr		sys_mount_setattr
+443  common	quotactl_path		sys_quotactl_path
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index d08eebad6b7f..f68517aaa4f1 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -445,3 +445,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 84403a99039c..3ee82321504d 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -488,3 +488,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2		compat_sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index a1c9f496fca6..f52a443eede0 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -447,3 +447,4 @@
 440	i386	process_madvise		sys_process_madvise
 441	i386	epoll_pwait2		sys_epoll_pwait2		compat_sys_epoll_pwait2
 442	i386	mount_setattr		sys_mount_setattr
+443	i386	quotactl_path		sys_quotactl_path
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 7bf01cbe582f..7eb007b8cab5 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -364,6 +364,7 @@
 440	common	process_madvise		sys_process_madvise
 441	common	epoll_pwait2		sys_epoll_pwait2
 442	common	mount_setattr		sys_mount_setattr
+443	common	quotactl_path		sys_quotactl_path
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 365a9b849224..c71cc45633de 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -413,3 +413,4 @@
 440	common	process_madvise			sys_process_madvise
 441	common	epoll_pwait2			sys_epoll_pwait2
 442	common	mount_setattr			sys_mount_setattr
+443	common	quotactl_path			sys_quotactl_path
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 2839dc9a7c01..a672bbe28577 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -483,6 +483,8 @@ asmlinkage long sys_pipe2(int __user *fildes, int flags);
 /* fs/quota.c */
 asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special,
 				qid_t id, void __user *addr);
+asmlinkage long sys_quotactl_path(unsigned int cmd, const char __user *mountpoint,
+				  qid_t id, void __user *addr);
 
 /* fs/readdir.c */
 asmlinkage long sys_getdents64(unsigned int fd,
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index ce58cff99b66..739c839d28fe 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -863,9 +863,11 @@ __SYSCALL(__NR_process_madvise, sys_process_madvise)
 __SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2)
 #define __NR_mount_setattr 442
 __SYSCALL(__NR_mount_setattr, sys_mount_setattr)
+#define __NR_quotactl_path 443
+__SYSCALL(__NR_quotactl_path, sys_quotactl_path)
 
 #undef __NR_syscalls
-#define __NR_syscalls 443
+#define __NR_syscalls 444
 
 /*
  * 32 bit systems traditionally used different
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 19aa806890d5..d24431782414 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -99,6 +99,7 @@ COND_SYSCALL(flock);
 
 /* fs/quota.c */
 COND_SYSCALL(quotactl);
+COND_SYSCALL(quotactl_path);
 
 /* fs/readdir.c */
 
-- 
2.29.2

Re: [PATCH 2/2] quota: wire up quotactl_path

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 19839 bytes --]

Hi Sascha,

I love your patch! Perhaps something to improve:

[auto build test WARNING on m68k/for-next]
[also build test WARNING on hp-parisc/for-next powerpc/next s390/features sparc/master linus/master v5.12-rc1]
[cannot apply to arm64/for-next/core tip/x86/asm]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210304-204157
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
config: x86_64-randconfig-m001-20210304 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/4c5e71a8aad3e3e1f2eb339eec24d563d0d6acbe
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210304-204157
        git checkout 4c5e71a8aad3e3e1f2eb339eec24d563d0d6acbe
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:69:1: note: in expansion of macro 'COND_SYSCALL'
      69 | COND_SYSCALL(epoll_pwait);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_pwait2' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:71:1: note: in expansion of macro 'COND_SYSCALL'
      71 | COND_SYSCALL(epoll_pwait2);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_init1' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:77:1: note: in expansion of macro 'COND_SYSCALL'
      77 | COND_SYSCALL(inotify_init1);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_add_watch' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:78:1: note: in expansion of macro 'COND_SYSCALL'
      78 | COND_SYSCALL(inotify_add_watch);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_rm_watch' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:79:1: note: in expansion of macro 'COND_SYSCALL'
      79 | COND_SYSCALL(inotify_rm_watch);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_ioprio_set' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:84:1: note: in expansion of macro 'COND_SYSCALL'
      84 | COND_SYSCALL(ioprio_set);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_ioprio_get' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:85:1: note: in expansion of macro 'COND_SYSCALL'
      85 | COND_SYSCALL(ioprio_get);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_flock' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:88:1: note: in expansion of macro 'COND_SYSCALL'
      88 | COND_SYSCALL(flock);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_quotactl' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:101:1: note: in expansion of macro 'COND_SYSCALL'
     101 | COND_SYSCALL(quotactl);
         | ^~~~~~~~~~~~
>> arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_quotactl_path' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:102:1: note: in expansion of macro 'COND_SYSCALL'
     102 | COND_SYSCALL(quotactl_path);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_signalfd4' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:113:1: note: in expansion of macro 'COND_SYSCALL'
     113 | COND_SYSCALL(signalfd4);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_timerfd_create' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:123:1: note: in expansion of macro 'COND_SYSCALL'
     123 | COND_SYSCALL(timerfd_create);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_timerfd_settime' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:124:1: note: in expansion of macro 'COND_SYSCALL'
     124 | COND_SYSCALL(timerfd_settime);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_timerfd_settime32' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:125:1: note: in expansion of macro 'COND_SYSCALL'
     125 | COND_SYSCALL(timerfd_settime32);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_timerfd_gettime' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:126:1: note: in expansion of macro 'COND_SYSCALL'
     126 | COND_SYSCALL(timerfd_gettime);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_timerfd_gettime32' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:127:1: note: in expansion of macro 'COND_SYSCALL'
     127 | COND_SYSCALL(timerfd_gettime32);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_acct' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)
         |  ^~~~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
     256 |  __X64_COND_SYSCALL(name)     \
         |  ^~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:132:1: note: in expansion of macro 'COND_SYSCALL'
     132 | COND_SYSCALL(acct);
         | ^~~~~~~~~~~~
   arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_capget' [-Wmissing-prototypes]
      83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
         |              ^~
   arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
     100 |  __COND_SYSCALL(x64, sys_##name)


vim +/__x64_sys_quotactl_path +83 arch/x86/include/asm/syscall_wrapper.h

cc42c045af1ff4de Brian Gerst       2020-03-13  13  
25c619e59b395a8c Brian Gerst       2020-03-13  14  /*
25c619e59b395a8c Brian Gerst       2020-03-13  15   * Instead of the generic __SYSCALL_DEFINEx() definition, the x86 version takes
25c619e59b395a8c Brian Gerst       2020-03-13  16   * struct pt_regs *regs as the only argument of the syscall stub(s) named as:
25c619e59b395a8c Brian Gerst       2020-03-13  17   * __x64_sys_*()         - 64-bit native syscall
25c619e59b395a8c Brian Gerst       2020-03-13  18   * __ia32_sys_*()        - 32-bit native syscall or common compat syscall
25c619e59b395a8c Brian Gerst       2020-03-13  19   * __ia32_compat_sys_*() - 32-bit compat syscall
25c619e59b395a8c Brian Gerst       2020-03-13  20   * __x32_compat_sys_*()  - 64-bit X32 compat syscall
25c619e59b395a8c Brian Gerst       2020-03-13  21   *
25c619e59b395a8c Brian Gerst       2020-03-13  22   * The registers are decoded according to the ABI:
25c619e59b395a8c Brian Gerst       2020-03-13  23   * 64-bit: RDI, RSI, RDX, R10, R8, R9
25c619e59b395a8c Brian Gerst       2020-03-13  24   * 32-bit: EBX, ECX, EDX, ESI, EDI, EBP
25c619e59b395a8c Brian Gerst       2020-03-13  25   *
25c619e59b395a8c Brian Gerst       2020-03-13  26   * The stub then passes the decoded arguments to the __se_sys_*() wrapper to
25c619e59b395a8c Brian Gerst       2020-03-13  27   * perform sign-extension (omitted for zero-argument syscalls).  Finally the
25c619e59b395a8c Brian Gerst       2020-03-13  28   * arguments are passed to the __do_sys_*() function which is the actual
25c619e59b395a8c Brian Gerst       2020-03-13  29   * syscall.  These wrappers are marked as inline so the compiler can optimize
25c619e59b395a8c Brian Gerst       2020-03-13  30   * the functions where appropriate.
25c619e59b395a8c Brian Gerst       2020-03-13  31   *
25c619e59b395a8c Brian Gerst       2020-03-13  32   * Example assembly (slightly re-ordered for better readability):
25c619e59b395a8c Brian Gerst       2020-03-13  33   *
25c619e59b395a8c Brian Gerst       2020-03-13  34   * <__x64_sys_recv>:		<-- syscall with 4 parameters
25c619e59b395a8c Brian Gerst       2020-03-13  35   *	callq	<__fentry__>
25c619e59b395a8c Brian Gerst       2020-03-13  36   *
25c619e59b395a8c Brian Gerst       2020-03-13  37   *	mov	0x70(%rdi),%rdi	<-- decode regs->di
25c619e59b395a8c Brian Gerst       2020-03-13  38   *	mov	0x68(%rdi),%rsi	<-- decode regs->si
25c619e59b395a8c Brian Gerst       2020-03-13  39   *	mov	0x60(%rdi),%rdx	<-- decode regs->dx
25c619e59b395a8c Brian Gerst       2020-03-13  40   *	mov	0x38(%rdi),%rcx	<-- decode regs->r10
25c619e59b395a8c Brian Gerst       2020-03-13  41   *
25c619e59b395a8c Brian Gerst       2020-03-13  42   *	xor	%r9d,%r9d	<-- clear %r9
25c619e59b395a8c Brian Gerst       2020-03-13  43   *	xor	%r8d,%r8d	<-- clear %r8
25c619e59b395a8c Brian Gerst       2020-03-13  44   *
25c619e59b395a8c Brian Gerst       2020-03-13  45   *	callq	__sys_recvfrom	<-- do the actual work in __sys_recvfrom()
25c619e59b395a8c Brian Gerst       2020-03-13  46   *				    which takes 6 arguments
25c619e59b395a8c Brian Gerst       2020-03-13  47   *
25c619e59b395a8c Brian Gerst       2020-03-13  48   *	cltq			<-- extend return value to 64-bit
25c619e59b395a8c Brian Gerst       2020-03-13  49   *	retq			<-- return
25c619e59b395a8c Brian Gerst       2020-03-13  50   *
25c619e59b395a8c Brian Gerst       2020-03-13  51   * This approach avoids leaking random user-provided register content down
25c619e59b395a8c Brian Gerst       2020-03-13  52   * the call chain.
25c619e59b395a8c Brian Gerst       2020-03-13  53   */
25c619e59b395a8c Brian Gerst       2020-03-13  54  
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  55  /* Mapping of registers to parameters for syscalls on x86-64 and x32 */
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  56  #define SC_X86_64_REGS_TO_ARGS(x, ...)					\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  57  	__MAP(x,__SC_ARGS						\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  58  		,,regs->di,,regs->si,,regs->dx				\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  59  		,,regs->r10,,regs->r8,,regs->r9)			\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  60  
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  61  /* Mapping of registers to parameters for syscalls on i386 */
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  62  #define SC_IA32_REGS_TO_ARGS(x, ...)					\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  63  	__MAP(x,__SC_ARGS						\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  64  	      ,,(unsigned int)regs->bx,,(unsigned int)regs->cx		\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  65  	      ,,(unsigned int)regs->dx,,(unsigned int)regs->si		\
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  66  	      ,,(unsigned int)regs->di,,(unsigned int)regs->bp)
ebeb8c82ffaf9443 Dominik Brodowski 2018-04-05  67  
d2b5de495ee9838b Brian Gerst       2020-03-13  68  #define __SYS_STUB0(abi, name)						\
0f78ff17112d8b34 Brian Gerst       2020-03-13  69  	long __##abi##_##name(const struct pt_regs *regs);		\
d2b5de495ee9838b Brian Gerst       2020-03-13  70  	ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO);			\
0f78ff17112d8b34 Brian Gerst       2020-03-13  71  	long __##abi##_##name(const struct pt_regs *regs)		\
d2b5de495ee9838b Brian Gerst       2020-03-13  72  		__alias(__do_##name);
d2b5de495ee9838b Brian Gerst       2020-03-13  73  
4399e0cf494f739a Brian Gerst       2020-03-13  74  #define __SYS_STUBx(abi, name, ...)					\
0f78ff17112d8b34 Brian Gerst       2020-03-13  75  	long __##abi##_##name(const struct pt_regs *regs);		\
4399e0cf494f739a Brian Gerst       2020-03-13  76  	ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO);			\
0f78ff17112d8b34 Brian Gerst       2020-03-13  77  	long __##abi##_##name(const struct pt_regs *regs)		\
4399e0cf494f739a Brian Gerst       2020-03-13  78  	{								\
4399e0cf494f739a Brian Gerst       2020-03-13  79  		return __se_##name(__VA_ARGS__);			\
4399e0cf494f739a Brian Gerst       2020-03-13  80  	}
4399e0cf494f739a Brian Gerst       2020-03-13  81  
6cc8d2b286d9e716 Brian Gerst       2020-03-13  82  #define __COND_SYSCALL(abi, name)					\
0f78ff17112d8b34 Brian Gerst       2020-03-13 @83  	__weak long __##abi##_##name(const struct pt_regs *__unused)	\
6cc8d2b286d9e716 Brian Gerst       2020-03-13  84  	{								\
6cc8d2b286d9e716 Brian Gerst       2020-03-13  85  		return sys_ni_syscall();				\
6cc8d2b286d9e716 Brian Gerst       2020-03-13  86  	}
6cc8d2b286d9e716 Brian Gerst       2020-03-13  87  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH 2/2] quota: wire up quotactl_path

[kernel test robot]

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Hi Sascha,

I love your patch! Perhaps something to improve:

[auto build test WARNING on m68k/for-next]
[also build test WARNING on hp-parisc/for-next powerpc/next s390/features sparc/master linus/master v5.12-rc1]
[cannot apply to arm64/for-next/core tip/x86/asm]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210304-204157
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
config: arm64-randconfig-r002-20210304 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/4c5e71a8aad3e3e1f2eb339eec24d563d0d6acbe
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sascha-Hauer/quota-Add-mountpath-based-quota-support/20210304-204157
        git checkout 4c5e71a8aad3e3e1f2eb339eec24d563d0d6acbe
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:53:1: note: in expansion of macro 'COND_SYSCALL'
      53 | COND_SYSCALL(io_uring_register);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_lookup_dcookie' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:60:1: note: in expansion of macro 'COND_SYSCALL'
      60 | COND_SYSCALL(lookup_dcookie);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:41:25: warning: no previous prototype for '__arm64_compat_sys_lookup_dcookie' [-Wmissing-prototypes]
      41 |  asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:61:1: note: in expansion of macro 'COND_SYSCALL_COMPAT'
      61 | COND_SYSCALL_COMPAT(lookup_dcookie);
         | ^~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_eventfd2' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:64:1: note: in expansion of macro 'COND_SYSCALL'
      64 | COND_SYSCALL(eventfd2);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_epoll_create1' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:67:1: note: in expansion of macro 'COND_SYSCALL'
      67 | COND_SYSCALL(epoll_create1);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_epoll_ctl' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:68:1: note: in expansion of macro 'COND_SYSCALL'
      68 | COND_SYSCALL(epoll_ctl);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_epoll_pwait' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:69:1: note: in expansion of macro 'COND_SYSCALL'
      69 | COND_SYSCALL(epoll_pwait);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:41:25: warning: no previous prototype for '__arm64_compat_sys_epoll_pwait' [-Wmissing-prototypes]
      41 |  asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:70:1: note: in expansion of macro 'COND_SYSCALL_COMPAT'
      70 | COND_SYSCALL_COMPAT(epoll_pwait);
         | ^~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_epoll_pwait2' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:71:1: note: in expansion of macro 'COND_SYSCALL'
      71 | COND_SYSCALL(epoll_pwait2);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:41:25: warning: no previous prototype for '__arm64_compat_sys_epoll_pwait2' [-Wmissing-prototypes]
      41 |  asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:72:1: note: in expansion of macro 'COND_SYSCALL_COMPAT'
      72 | COND_SYSCALL_COMPAT(epoll_pwait2);
         | ^~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_inotify_init1' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:77:1: note: in expansion of macro 'COND_SYSCALL'
      77 | COND_SYSCALL(inotify_init1);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_inotify_add_watch' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:78:1: note: in expansion of macro 'COND_SYSCALL'
      78 | COND_SYSCALL(inotify_add_watch);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_inotify_rm_watch' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:79:1: note: in expansion of macro 'COND_SYSCALL'
      79 | COND_SYSCALL(inotify_rm_watch);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_ioprio_set' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:84:1: note: in expansion of macro 'COND_SYSCALL'
      84 | COND_SYSCALL(ioprio_set);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_ioprio_get' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:85:1: note: in expansion of macro 'COND_SYSCALL'
      85 | COND_SYSCALL(ioprio_get);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_flock' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:88:1: note: in expansion of macro 'COND_SYSCALL'
      88 | COND_SYSCALL(flock);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_quotactl' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:101:1: note: in expansion of macro 'COND_SYSCALL'
     101 | COND_SYSCALL(quotactl);
         | ^~~~~~~~~~~~
>> arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_quotactl_path' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:102:1: note: in expansion of macro 'COND_SYSCALL'
     102 | COND_SYSCALL(quotactl_path);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_signalfd4' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:113:1: note: in expansion of macro 'COND_SYSCALL'
     113 | COND_SYSCALL(signalfd4);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:41:25: warning: no previous prototype for '__arm64_compat_sys_signalfd4' [-Wmissing-prototypes]
      41 |  asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:114:1: note: in expansion of macro 'COND_SYSCALL_COMPAT'
     114 | COND_SYSCALL_COMPAT(signalfd4);
         | ^~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_timerfd_create' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:123:1: note: in expansion of macro 'COND_SYSCALL'
     123 | COND_SYSCALL(timerfd_create);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_timerfd_settime' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:124:1: note: in expansion of macro 'COND_SYSCALL'
     124 | COND_SYSCALL(timerfd_settime);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_timerfd_settime32' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:125:1: note: in expansion of macro 'COND_SYSCALL'
     125 | COND_SYSCALL(timerfd_settime32);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_timerfd_gettime' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:126:1: note: in expansion of macro 'COND_SYSCALL'
     126 | COND_SYSCALL(timerfd_gettime);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_timerfd_gettime32' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:127:1: note: in expansion of macro 'COND_SYSCALL'
     127 | COND_SYSCALL(timerfd_gettime32);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_acct' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:132:1: note: in expansion of macro 'COND_SYSCALL'
     132 | COND_SYSCALL(acct);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_capget' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:135:1: note: in expansion of macro 'COND_SYSCALL'
     135 | COND_SYSCALL(capget);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_capset' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:136:1: note: in expansion of macro 'COND_SYSCALL'
     136 | COND_SYSCALL(capset);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_clone3' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:144:1: note: in expansion of macro 'COND_SYSCALL'
     144 | COND_SYSCALL(clone3);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_futex' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:147:1: note: in expansion of macro 'COND_SYSCALL'
     147 | COND_SYSCALL(futex);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_futex_time32' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:148:1: note: in expansion of macro 'COND_SYSCALL'
     148 | COND_SYSCALL(futex_time32);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_set_robust_list' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:149:1: note: in expansion of macro 'COND_SYSCALL'
     149 | COND_SYSCALL(set_robust_list);
         | ^~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:41:25: warning: no previous prototype for '__arm64_compat_sys_set_robust_list' [-Wmissing-prototypes]
      41 |  asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~~~~~~~~
   kernel/sys_ni.c:150:1: note: in expansion of macro 'COND_SYSCALL_COMPAT'
     150 | COND_SYSCALL_COMPAT(set_robust_list);
         | ^~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/syscall_wrapper.h:76:25: warning: no previous prototype for '__arm64_sys_get_robust_list' [-Wmissing-prototypes]
      76 |  asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
         |                         ^~~~~~~~~~~~
   kernel/sys_ni.c:151:1: note: in expansion of macro 'COND_SYSCALL'
     151 | COND_SYSCALL(get_robust_list);


vim +/__arm64_sys_quotactl_path +76 arch/arm64/include/asm/syscall_wrapper.h

4378a7d4be30ec Mark Rutland  2018-07-11  50  
4378a7d4be30ec Mark Rutland  2018-07-11  51  #define __SYSCALL_DEFINEx(x, name, ...)						\
4378a7d4be30ec Mark Rutland  2018-07-11  52  	asmlinkage long __arm64_sys##name(const struct pt_regs *regs);		\
4378a7d4be30ec Mark Rutland  2018-07-11  53  	ALLOW_ERROR_INJECTION(__arm64_sys##name, ERRNO);			\
4378a7d4be30ec Mark Rutland  2018-07-11  54  	static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));		\
4378a7d4be30ec Mark Rutland  2018-07-11  55  	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));	\
4378a7d4be30ec Mark Rutland  2018-07-11  56  	asmlinkage long __arm64_sys##name(const struct pt_regs *regs)		\
4378a7d4be30ec Mark Rutland  2018-07-11  57  	{									\
4378a7d4be30ec Mark Rutland  2018-07-11  58  		return __se_sys##name(SC_ARM64_REGS_TO_ARGS(x,__VA_ARGS__));	\
4378a7d4be30ec Mark Rutland  2018-07-11  59  	}									\
4378a7d4be30ec Mark Rutland  2018-07-11  60  	static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))		\
4378a7d4be30ec Mark Rutland  2018-07-11  61  	{									\
4378a7d4be30ec Mark Rutland  2018-07-11  62  		long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));	\
4378a7d4be30ec Mark Rutland  2018-07-11  63  		__MAP(x,__SC_TEST,__VA_ARGS__);					\
4378a7d4be30ec Mark Rutland  2018-07-11  64  		__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__));		\
4378a7d4be30ec Mark Rutland  2018-07-11  65  		return ret;							\
4378a7d4be30ec Mark Rutland  2018-07-11  66  	}									\
4378a7d4be30ec Mark Rutland  2018-07-11  67  	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
4378a7d4be30ec Mark Rutland  2018-07-11  68  
4378a7d4be30ec Mark Rutland  2018-07-11  69  #define SYSCALL_DEFINE0(sname)							\
4378a7d4be30ec Mark Rutland  2018-07-11  70  	SYSCALL_METADATA(_##sname, 0);						\
0e358bd7b7ebd2 Sami Tolvanen 2019-05-24  71  	asmlinkage long __arm64_sys_##sname(const struct pt_regs *__unused);	\
4378a7d4be30ec Mark Rutland  2018-07-11  72  	ALLOW_ERROR_INJECTION(__arm64_sys_##sname, ERRNO);			\
0e358bd7b7ebd2 Sami Tolvanen 2019-05-24  73  	asmlinkage long __arm64_sys_##sname(const struct pt_regs *__unused)
4378a7d4be30ec Mark Rutland  2018-07-11  74  
c27eccfe4d6c74 Sami Tolvanen 2019-09-10  75  #define COND_SYSCALL(name)							\
c27eccfe4d6c74 Sami Tolvanen 2019-09-10 @76  	asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs)	\
c27eccfe4d6c74 Sami Tolvanen 2019-09-10  77  	{									\
c27eccfe4d6c74 Sami Tolvanen 2019-09-10  78  		return sys_ni_syscall();					\
c27eccfe4d6c74 Sami Tolvanen 2019-09-10  79  	}
4378a7d4be30ec Mark Rutland  2018-07-11  80  

---
0-DAY CI Kernel Test Service, Intel Corporation
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