kern: syscall: Add SYS_mount syscall

This commit introduces the system call for mounting filesystems. As of
now, only the fstype and target params are supported

Signed-off-by: Ian Moffett <ian@osmora.org>

5 files changed, 76 insertions, 13 deletions

diff --git a/src/sys/compat/unix/os/os_filedesc.c b/src/sys/compat/unix/os/os_filedesc.c
index 86bb62b..48ea6be 100644
--- a/src/sys/compat/unix/os/os_filedesc.c
+++ b/src/sys/compat/unix/os/os_filedesc.c
@@ -28,14 +28,15 @@
  */
 
 #include <sys/syscall.h>
+#include <sys/limits.h>
+#include <sys/syslog.h>
+#include <sys/mount.h>
 #include <sys/errno.h>
 #include <sys/types.h>
 #include <os/systm.h>
 #include <os/filedesc.h>
 #include <compat/unix/syscall.h>
 
-#include <sys/syslog.h>
-
 /*
  * Write syscall
  *
@@ -60,3 +61,47 @@ sys_write(struct syscall_args *scargs)
 
     return write(fd, kbuf, count);
 }
+
+/*
+ * ARG0: Source
+ * ARG1: Target
+ * ARG2: Filesystem type
+ * ARG3: Mountflags
+ * ARG4: Data
+ */
+scret_t
+sys_mount(struct syscall_args *scargs)
+{
+    struct mount_args args;
+    char source[NAME_MAX];
+    char target[NAME_MAX];
+    char fstype[FSNAME_MAX];
+    const char *u_source = SCARG(scargs, const char *, 0);
+    const char *u_target = SCARG(scargs, const char *, 1);
+    const char *u_fstype = SCARG(scargs, const char *, 2);
+    unsigned long u_mountflags = SCARG(scargs, unsigned long, 3);
+    int error;
+
+    /* Get the filesystem source */
+    error = copyinstr(u_source, source, sizeof(source));
+    if (error < 0) {
+        source[0] = '\0';
+    }
+
+    /* Get the filesystem target */
+    error = copyinstr(u_target, target, sizeof(target));
+    if (error < 0) {
+        return error;
+    }
+
+    /* Get the filesystem type */
+    error = copyinstr(u_fstype, fstype, sizeof(u_fstype));
+    if (error < 0) {
+        return error;
+    }
+
+    args.source = source;
+    args.target = target;
+    args.fstype = fstype;
+    return kmount(&args, u_mountflags);
+}
diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h
index ab464c4..5339d47 100644
--- a/src/sys/include/compat/unix/syscall.h
+++ b/src/sys/include/compat/unix/syscall.h
@@ -32,6 +32,7 @@
 
 #include <sys/proc.h>
 #include <sys/param.h>
+#include <sys/mount.h>
 #include <sys/syscall.h>
 
 /*
@@ -61,7 +62,8 @@ scret_t(*g_unix_sctab[])(struct syscall_args *) = {
     [SYS_write]  = sys_write,
     [SYS_cross]  = sys_cross,
     [SYS_query]  = sys_query,
-    [SYS_spawn]  = sys_spawn
+    [SYS_spawn]  = sys_spawn,
+    [SYS_mount]  = sys_mount
 };
 
 #endif  /* !_NEED_UNIX_SCTAB */
diff --git a/src/sys/include/sys/mount.h b/src/sys/include/sys/mount.h
index 4e39279..6d041ee 100644
--- a/src/sys/include/sys/mount.h
+++ b/src/sys/include/sys/mount.h
@@ -31,22 +31,32 @@
 #define _SYS_MOUNT_H_
 
 #include <sys/queue.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
+#if defined(_KERNEL)
 #include <os/vnode.h>
+#endif /* defined(_KERNEL) */
 
-#if defined(_KERNEL)
+/*
+ * Mount filesystem string names
+ */
+#define MOUNT_INITRD "initrd"   /* Initial ramdisk */
+#define MOUNT_DEVFS  "devfs"    /* Device filesystem */
 
 /*
- * Number of bytes allowed in a filesystem
- * name including the null termination
+ * The mount system call
  */
-#define FSNAME_MAX 16
+int mount(
+    const char *source, const char *target, const char *fstype,
+    unsigned long mountflags, void *data
+);
 
+#if defined(_KERNEL)
 /*
- * Mount filesystem string names
+ * Number of bytes allowed in a filesystem
+ * name including the null termination
  */
-#define MOUNT_INITRD "initrd"   /* Initial ramdisk */
-#define MOUNT_DEVFS  "devfs"    /* Device filesystem */
+#define FSNAME_MAX 16
 
 /* Forward declarations */
 struct fs_info;
@@ -155,7 +165,7 @@ int mount_lookup(const char *name, struct mount **mp_res);
  * Returns zero on success, otherwise a less than zero
  * failure upon failure.
  */
-int mount(struct mount_args *margs, uint32_t flags);
+int kmount(struct mount_args *margs, uint32_t flags);
 
 /*
  * Initialize a mountpoint to a known state
@@ -178,5 +188,10 @@ int mountlist_init(struct mountlist *mlp);
  */
 int mount_alloc(const char *name, struct mount **mp_res);
 
+/*
+ * Mount system call
+ */
+scret_t sys_mount(struct syscall_args *scargs);
+
 #endif  /* !_KERNEL */
 #endif  /* !_SYS_MOUNT_H_ */
diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h
index c1c06bb..4121d54 100644
--- a/src/sys/include/sys/syscall.h
+++ b/src/sys/include/sys/syscall.h
@@ -49,6 +49,7 @@
 #define SYS_sigaction   0x04
 #define SYS_query       0x05    /* query a border (mandatory) */
 #define SYS_spawn       0x06    /* spawn a process */
+#define SYS_mount       0x07    /* mount a filesystem */
 
 typedef __ssize_t scret_t;
 typedef __ssize_t scarg_t;
diff --git a/src/sys/os/vfs_mount.c b/src/sys/os/vfs_mount.c
index 034b324..8048352 100644
--- a/src/sys/os/vfs_mount.c
+++ b/src/sys/os/vfs_mount.c
@@ -165,7 +165,7 @@ mount_alloc(const char *name, struct mount **mp_res)
  * Mount a filesystem
  */
 int
-mount(struct mount_args *margs, uint32_t flags)
+kmount(struct mount_args *margs, uint32_t flags)
 {
     const struct vfsops *vfsops;
     struct mount *mpp;
@@ -256,6 +256,6 @@ mountlist_init(struct mountlist *mlp)
 
     TAILQ_INIT(&mlp->list);
     mlp->i = 1;
-    mount(&margs, 0);
+    kmount(&margs, 0);
     return 0;
 }