MFC r283492:

Implement Linux specific syncfs() system call.

7 files changed, 44 insertions, 6 deletions

diff --git a/sys/amd64/linux/linux_dummy.c b/sys/amd64/linux/linux_dummy.c
index f8910d8..96cf8d9 100644
--- a/sys/amd64/linux/linux_dummy.c
+++ b/sys/amd64/linux/linux_dummy.c
@@ -113,7 +113,6 @@ DUMMY(fanotify_mark);
 DUMMY(name_to_handle_at);
 DUMMY(open_by_handle_at);
 DUMMY(clock_adjtime);
-DUMMY(syncfs);
 DUMMY(setns);
 DUMMY(process_vm_readv);
 DUMMY(process_vm_writev);
diff --git a/sys/amd64/linux/syscalls.master b/sys/amd64/linux/syscalls.master
index aa6338b..d840f88 100644
--- a/sys/amd64/linux/syscalls.master
+++ b/sys/amd64/linux/syscalls.master
@@ -502,7 +502,7 @@
 303	AUE_NULL	STD	{ int linux_name_to_handle_at(void); }
 304	AUE_NULL	STD	{ int linux_open_by_handle_at(void); }
 305	AUE_NULL	STD	{ int linux_clock_adjtime(void); }
-306	AUE_NULL	STD	{ int linux_syncfs(void); }
+306	AUE_SYNC	STD	{ int linux_syncfs(l_int fd); }
 307	AUE_NULL	STD	{ int linux_sendmmsg(l_int s,			\
 				    struct l_mmsghdr *msg, l_uint vlen,		\
 				    l_uint flags); }
diff --git a/sys/amd64/linux32/linux32_dummy.c b/sys/amd64/linux32/linux32_dummy.c
index 0022e05..de8b620 100644
--- a/sys/amd64/linux32/linux32_dummy.c
+++ b/sys/amd64/linux32/linux32_dummy.c
@@ -125,7 +125,6 @@ DUMMY(fanotify_mark);
 DUMMY(name_to_handle_at);
 DUMMY(open_by_handle_at);
 DUMMY(clock_adjtime);
-DUMMY(syncfs);
 DUMMY(setns);
 DUMMY(process_vm_readv);
 DUMMY(process_vm_writev);
diff --git a/sys/amd64/linux32/syscalls.master b/sys/amd64/linux32/syscalls.master
index 05d2c0e..5f688f3 100644
--- a/sys/amd64/linux32/syscalls.master
+++ b/sys/amd64/linux32/syscalls.master
@@ -573,7 +573,7 @@
 341	AUE_NULL	STD	{ int linux_name_to_handle_at(void); }
 342	AUE_NULL	STD	{ int linux_open_by_handle_at(void); }
 343	AUE_NULL	STD	{ int linux_clock_adjtime(void); }
-344	AUE_NULL	STD	{ int linux_syncfs(void); }
+344	AUE_SYNC	STD	{ int linux_syncfs(l_int fd); }
 345	AUE_NULL	STD	{ int linux_sendmmsg(l_int s,			\
 				    struct l_mmsghdr *msg, l_uint vlen,		\
 				    l_uint flags); }
diff --git a/sys/compat/linux/linux_stats.c b/sys/compat/linux/linux_stats.c
index 7c1d40a..f96acc0 100644
--- a/sys/compat/linux/linux_stats.c
+++ b/sys/compat/linux/linux_stats.c
@@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_compat.h"
 
 #include <sys/param.h>
+#include <sys/capsicum.h>
 #include <sys/dirent.h>
 #include <sys/file.h>
 #include <sys/filedesc.h>
@@ -653,3 +654,43 @@ linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args)
 }
 
 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
+
+int
+linux_syncfs(struct thread *td, struct linux_syncfs_args *args)
+{
+	cap_rights_t rights;
+	struct mount *mp;
+	struct vnode *vp;
+	int error, save;
+
+	error = fgetvp(td, args->fd, cap_rights_init(&rights, CAP_FSYNC), &vp);
+	if (error != 0)
+		/*
+		 * Linux syncfs() returns only EBADF, however fgetvp()
+		 * can return EINVAL in case of file descriptor does
+		 * not represent a vnode. XXX.
+		 */
+		return (error);
+
+	mp = vp->v_mount;
+	mtx_lock(&mountlist_mtx);
+	error = vfs_busy(mp, MBF_MNTLSTLOCK);
+	if (error != 0) {
+		/* See comment above. */
+		mtx_unlock(&mountlist_mtx);
+		goto out;
+	}
+	if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
+	    vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
+		save = curthread_pflags_set(TDP_SYNCIO);
+		vfs_msync(mp, MNT_NOWAIT);
+		VFS_SYNC(mp, MNT_NOWAIT);
+		curthread_pflags_restore(save);
+		vn_finished_write(mp);
+	}
+	vfs_unbusy(mp);
+
+ out:
+	vrele(vp);
+	return (error);
+}
diff --git a/sys/i386/linux/linux_dummy.c b/sys/i386/linux/linux_dummy.c
index ed552b3..8c42f89 100644
--- a/sys/i386/linux/linux_dummy.c
+++ b/sys/i386/linux/linux_dummy.c
@@ -121,7 +121,6 @@ DUMMY(fanotify_mark);
 DUMMY(name_to_handle_at);
 DUMMY(open_by_handle_at);
 DUMMY(clock_adjtime);
-DUMMY(syncfs);
 DUMMY(setns);
 DUMMY(process_vm_readv);
 DUMMY(process_vm_writev);
diff --git a/sys/i386/linux/syscalls.master b/sys/i386/linux/syscalls.master
index 4a70b6b..e6609a9 100644
--- a/sys/i386/linux/syscalls.master
+++ b/sys/i386/linux/syscalls.master
@@ -581,7 +581,7 @@
 341	AUE_NULL	STD	{ int linux_name_to_handle_at(void); }
 342	AUE_NULL	STD	{ int linux_open_by_handle_at(void); }
 343	AUE_NULL	STD	{ int linux_clock_adjtime(void); }
-344	AUE_NULL	STD	{ int linux_syncfs(void); }
+344	AUE_SYNC	STD	{ int linux_syncfs(l_int fd); }
 345	AUE_NULL	STD	{ int linux_sendmmsg(l_int s,			\
 				    struct l_mmsghdr *msg, l_uint vlen,		\
 				    l_uint flags); }