summaryrefslogtreecommitdiff
path: root/sys
diff options
context:
space:
mode:
Diffstat (limited to 'sys')
-rw-r--r--sys/fs/initramfs.c263
-rw-r--r--sys/include/fs/initramfs.h37
-rw-r--r--sys/include/sys/mount.h84
-rw-r--r--sys/include/sys/namei.h44
-rw-r--r--sys/include/sys/vnode.h74
-rw-r--r--sys/kern/init_main.c4
-rw-r--r--sys/kern/vfs_init.c70
-rw-r--r--sys/kern/vfs_lookup.c83
-rw-r--r--sys/kern/vfs_subr.c122
9 files changed, 781 insertions, 0 deletions
diff --git a/sys/fs/initramfs.c b/sys/fs/initramfs.c
new file mode 100644
index 0000000..4c47da8
--- /dev/null
+++ b/sys/fs/initramfs.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/cdefs.h>
+#include <sys/errno.h>
+#include <sys/limine.h>
+#include <sys/panic.h>
+#include <sys/vnode.h>
+#include <fs/initramfs.h>
+#include <vm/dynalloc.h>
+#include <string.h>
+
+#define CPIO_TRAILER "TRAILER!!!"
+
+/*
+ * File or directory.
+ */
+struct initramfs_node {
+ const char *path; /* Path */
+ void *data; /* File data */
+ size_t size; /* File size */
+ mode_t mode; /* Perms and type */
+};
+
+/*
+ * ODC CPIO header
+ */
+struct cpio_hdr {
+ char c_magic[6];
+ char c_dev[6];
+ char c_ino[6];
+ char c_mode[6];
+ char c_uid[6];
+ char c_gid[6];
+ char c_nlink[6];
+ char c_rdev[6];
+ char c_mtime[11];
+ char c_namesize[6];
+ char c_filesize[11];
+};
+
+static volatile struct limine_module_request mod_req = {
+ .id = LIMINE_MODULE_REQUEST,
+ .revision = 0
+};
+
+static const char *initramfs = NULL;
+static uint64_t initramfs_size;
+
+/*
+ * Fetch a module from the bootloader.
+ * This is used to fetch the ramfs image.
+ */
+static char *
+get_module(const char *path, uint64_t *size) {
+ for (uint64_t i = 0; i < mod_req.response->module_count; ++i) {
+ if (strcmp(mod_req.response->modules[i]->path, path) == 0) {
+ *size = mod_req.response->modules[i]->size;
+ return mod_req.response->modules[i]->address;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Convert octal to base 10
+ */
+static uint32_t
+oct2dec(const char *in, size_t sz)
+{
+ size_t val = 0;
+
+ for (size_t i = 0; i < sz; ++i) {
+ val = val * 8 + (in[i] - '0');
+ }
+
+ return val;
+}
+
+/*
+ * Get a file from initramfs
+ *
+ * @path: Path of file to get.
+ * @res: Pointer to new resulting node.
+ */
+static int
+initramfs_get_file(const char *path, struct initramfs_node *res)
+{
+ const struct cpio_hdr *hdr;
+ struct initramfs_node node;
+ uintptr_t addr;
+ size_t namesize, filesize;
+ mode_t mode;
+
+ addr = (uintptr_t)initramfs;
+ for (;;) {
+ hdr = (void *)addr;
+ namesize = oct2dec(hdr->c_namesize, sizeof(hdr->c_namesize));
+ filesize = oct2dec(hdr->c_filesize, sizeof(hdr->c_filesize));
+ mode = oct2dec(hdr->c_mode, sizeof(hdr->c_mode));
+
+ /* Make sure the magic is correct */
+ if (strncmp(hdr->c_magic, "070707", 6) != 0) {
+ return -EINVAL;
+ }
+
+ addr += sizeof(struct cpio_hdr);
+ node.path = (const char *)addr;
+
+ /* Is this the requested file? */
+ if (strcmp(node.path, path) == 0) {
+ node.data = (void *)(addr + namesize);
+ node.size = filesize;
+ node.mode = mode;
+ *res = node;
+ return 0;
+ }
+
+ /* Get next header and see if we are at the end */
+ addr += (namesize + filesize);
+ if (strcmp(node.path, CPIO_TRAILER) == 0) {
+ break;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static int
+initramfs_lookup(struct vop_lookup_args *args)
+{
+ int status, vtype;
+ struct initramfs_node *n;
+ struct vnode *vp;
+ const char *path = args->name;
+
+ if (*path == '/') {
+ ++path;
+ }
+
+ n = dynalloc(sizeof(*n));
+ if (n == NULL) {
+ return -ENOMEM;
+ }
+
+ /* Now does this file exist? */
+ if ((status = initramfs_get_file(path, n)) != 0) {
+ dynfree(n);
+ return status;
+ }
+
+ vtype = ISSET(n->mode, 0040000) ? VDIR : VREG;
+
+ /* Try to create a new vnode */
+ if ((status = vfs_alloc_vnode(&vp, vtype)) != 0) {
+ dynfree(n);
+ return status;
+ }
+
+ vp->data = n;
+ vp->vops = &g_initramfs_vops;
+ *args->vpp = vp;
+ return 0;
+}
+
+static int
+initramfs_read(struct vnode *vp, struct sio_txn *sio)
+{
+ struct initramfs_node *n = vp->data;
+ uint8_t *src, *dest;
+ uint32_t count = 0;
+
+ /* Ensure pointers are valid */
+ if (n == NULL)
+ return -EIO;
+ if (sio->buf == NULL)
+ return -EIO;
+
+ src = n->data;
+ dest = sio->buf;
+
+ /* Copy the file data */
+ for (size_t i = 0; i < sio->len; ++i) {
+ if ((sio->offset + i) >= n->size) {
+ break;
+ }
+ dest[i] = src[sio->offset + i];
+ ++count;
+ }
+
+ return count;
+}
+
+static int
+initramfs_reclaim(struct vnode *vp)
+{
+ if (vp->data != NULL) {
+ dynfree(vp->data);
+ }
+
+ return 0;
+}
+
+static int
+initramfs_init(struct fs_info *fip)
+{
+ struct mount *mp;
+ int status;
+
+ initramfs = get_module("/boot/ramfs.cpio", &initramfs_size);
+ if (initramfs == NULL) {
+ panic("Failed to open initramfs cpio image\n");
+ }
+
+ status = vfs_alloc_vnode(&g_root_vnode, VDIR);
+ if (__unlikely(status != 0)) {
+ panic("Failed to create root vnode for ramfs\n");
+ }
+
+ g_root_vnode->vops = &g_initramfs_vops;
+ mp = vfs_alloc_mount(g_root_vnode, fip);
+ TAILQ_INSERT_TAIL(&g_mountlist, mp, mnt_list);
+ return 0;
+}
+
+const struct vops g_initramfs_vops = {
+ .lookup = initramfs_lookup,
+ .read = initramfs_read,
+ .reclaim = initramfs_reclaim
+};
+
+const struct vfsops g_initramfs_vfsops = {
+ .init = initramfs_init
+};
diff --git a/sys/include/fs/initramfs.h b/sys/include/fs/initramfs.h
new file mode 100644
index 0000000..897079c
--- /dev/null
+++ b/sys/include/fs/initramfs.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _INITRAMFS_H_
+#define _INITRAMFS_H_
+
+#include <sys/vnode.h>
+
+extern const struct vops g_initramfs_vops;
+
+#endif /* _INITRAMFS_H_ */
diff --git a/sys/include/sys/mount.h b/sys/include/sys/mount.h
new file mode 100644
index 0000000..e46cda9
--- /dev/null
+++ b/sys/include/sys/mount.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_MOUNT_H_
+#define _SYS_MOUNT_H_
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/spinlock.h>
+
+#if defined(_KERNEL)
+
+#define FS_NAME_MAX 16 /* Length of fs name including nul */
+
+/*
+ * Filesystem types.
+ */
+#define MOUNT_RAMFS "initramfs"
+
+struct vfsops;
+struct mount;
+
+/* Mount list */
+typedef TAILQ_HEAD(, mount) mountlist_t;
+extern mountlist_t g_mountlist;
+
+/* Filesystem operations */
+extern const struct vfsops g_initramfs_vfsops;
+
+struct mount {
+ struct spinlock lock;
+ struct vnode *vp;
+ const struct vfsops *mnt_ops;
+ void *data;
+ TAILQ_ENTRY(mount) mnt_list;
+};
+
+struct fs_info {
+ char name[FS_NAME_MAX]; /* FS Type name */
+ const struct vfsops *vfsops; /* Operations vector */
+ int flags; /* Flags for this filesystem */
+ int refcount; /* Mount count of this type */
+};
+
+struct vfsops {
+ int(*init)(struct fs_info *fip);
+ int(*mount)(struct mount *mp, const char *path, void *data,
+ struct nameidata *ndp);
+};
+
+void vfs_init(void);
+struct mount *vfs_alloc_mount(struct vnode *vp, struct fs_info *fip);
+struct fs_info *vfs_byname(const char *name);
+
+#endif /* _KERNEL */
+#endif /* _SYS_MOUNT_H_ */
diff --git a/sys/include/sys/namei.h b/sys/include/sys/namei.h
new file mode 100644
index 0000000..bd3c0db
--- /dev/null
+++ b/sys/include/sys/namei.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_NAMEI_H_
+#define _SYS_NAMEI_H_
+
+#include <sys/types.h>
+#include <sys/vnode.h>
+
+struct nameidata {
+ const char *path; /* Pathname */
+ uint32_t flags;
+ struct vnode *vp; /* Vnode result */
+};
+
+int namei(struct nameidata *ndp);
+
+#endif /* !_SYS_NAMEI_H_ */
diff --git a/sys/include/sys/vnode.h b/sys/include/sys/vnode.h
new file mode 100644
index 0000000..1caf2cb
--- /dev/null
+++ b/sys/include/sys/vnode.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_VNODE_H_
+#define _SYS_VNODE_H_
+
+#include <sys/sio.h>
+
+#if defined(_KERNEL)
+
+struct vops;
+
+struct vnode {
+ int type;
+ int flags;
+ void *data;
+ const struct vops *vops;
+};
+
+/* Vnode type flags */
+#define VNON 0x00 /* Uninitialized */
+#define VREG 0x01 /* Regular file */
+#define VDIR 0x02 /* Directory */
+#define VCHR 0x03 /* Character device */
+#define VBLK 0x04 /* Block device */
+
+struct vop_lookup_args {
+ const char *name; /* Current path component */
+ struct vnode *dirvp; /* Directory vnode */
+ struct vnode **vpp; /* Result vnode */
+};
+
+struct vops {
+ int(*lookup)(struct vop_lookup_args *args);
+ int(*read)(struct vnode *vp, struct sio_txn *sio);
+ int(*reclaim)(struct vnode *vp);
+};
+
+extern struct vnode *g_root_vnode;
+
+int vfs_alloc_vnode(struct vnode **res, int type);
+int vfs_release_vnode(struct vnode *vp);
+
+int vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args);
+int vfs_vop_read(struct vnode *vp, struct sio_txn *sio);
+
+#endif /* _KERNEL */
+#endif /* !_SYS_VNODE_H_ */
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 6018dfe..09b8d2d 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -30,6 +30,7 @@
#include <sys/reboot.h>
#include <sys/syslog.h>
#include <sys/sched.h>
+#include <sys/mount.h>
#include <dev/cons/cons.h>
#include <dev/acpi/acpi.h>
#include <machine/cpu.h>
@@ -52,6 +53,9 @@ main(void)
/* Startup the BSP */
cpu_startup(&g_bsp_ci);
+ /* Init the virtual file system */
+ vfs_init();
+
/* Start scheduler and bootstrap APs */
sched_init();
mp_bootstrap_aps(&g_bsp_ci);
diff --git a/sys/kern/vfs_init.c b/sys/kern/vfs_init.c
new file mode 100644
index 0000000..aafbc00
--- /dev/null
+++ b/sys/kern/vfs_init.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/mount.h>
+#include <sys/vnode.h>
+#include <sys/panic.h>
+#include <string.h>
+
+struct vnode *g_root_vnode = NULL;
+static struct fs_info fs_list[] = {
+ {MOUNT_RAMFS, &g_initramfs_vfsops, 0, 0},
+};
+
+void
+vfs_init(void)
+{
+ struct fs_info *fs;
+ const struct vfsops *vfsops;
+
+ TAILQ_INIT(&g_mountlist);
+
+ for (size_t i= 0; i < NELEM(fs_list); ++i) {
+ fs = &fs_list[i];
+ vfsops = fs->vfsops;
+
+ /* Try to initialize the filesystem */
+ if (vfsops->init != NULL) {
+ vfsops->init(fs);
+ }
+ }
+}
+
+struct fs_info *
+vfs_byname(const char *name)
+{
+ for (int i = 0; i < NELEM(fs_list); ++i) {
+ if (strcmp(fs_list[i].name, name) == 0) {
+ return &fs_list[i];
+ }
+ }
+
+ return NULL;
+}
diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
new file mode 100644
index 0000000..83924c6
--- /dev/null
+++ b/sys/kern/vfs_lookup.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/errno.h>
+#include <vm/dynalloc.h>
+#include <string.h>
+
+/*
+ * Convert a path to a vnode.
+ *
+ * @ndp: Nameidata containing the path and resulting
+ * vnode.
+ *
+ * TODO: Add support for lookups with individual
+ * path components
+ */
+int
+namei(struct nameidata *ndp)
+{
+ struct vnode *vp;
+ struct vop_lookup_args lookup_args;
+ const char *path = ndp->path;
+ int status;
+
+ if (path == NULL) {
+ return -EINVAL;
+ }
+
+ /* Path must start with "/" */
+ if (*path != '/') {
+ return -EINVAL;
+ }
+
+ /* Just return the root vnode if we can */
+ if (strcmp(path, "/") == 0) {
+ ndp->vp = g_root_vnode;
+ return 0;
+ }
+
+ /*
+ * Some filesystems (like initramfs) may only understand
+ * full paths, so try passing it through.
+ */
+ lookup_args.name = path;
+ lookup_args.dirvp = g_root_vnode;
+ lookup_args.vpp = &vp;
+ status = vfs_vop_lookup(lookup_args.dirvp, &lookup_args);
+
+ if (status != 0) {
+ return status;
+ }
+
+ ndp->vp = vp;
+ return 0;
+}
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
new file mode 100644
index 0000000..04d64e3
--- /dev/null
+++ b/sys/kern/vfs_subr.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/vnode.h>
+#include <sys/errno.h>
+#include <sys/mount.h>
+#include <vm/dynalloc.h>
+#include <string.h>
+
+mountlist_t g_mountlist;
+
+int
+vfs_alloc_vnode(struct vnode **res, int type)
+{
+ struct vnode *vp = dynalloc(sizeof(struct vnode));
+
+ if (vp == NULL) {
+ return -ENOMEM;
+ }
+
+ memset(vp, 0, sizeof(*vp));
+ vp->type = type;
+ *res = vp;
+ return 0;
+}
+
+/*
+ * Allocate a mount structure.
+ *
+ * @vp: Vnode this mount structure covers.
+ * @fip: File system information.
+ */
+struct mount *
+vfs_alloc_mount(struct vnode *vp, struct fs_info *fip)
+{
+ struct mount *mp;
+
+ mp = dynalloc(sizeof(*mp));
+
+ if (mp == NULL) {
+ return NULL;
+ }
+
+ memset(mp, 0, sizeof(*mp));
+ mp->vp = vp;
+ mp->mnt_ops = fip->vfsops;
+ return mp;
+}
+
+/*
+ * Release a vnode and its resources from
+ * memory.
+ */
+int
+vfs_release_vnode(struct vnode *vp)
+{
+ const struct vops *vops = vp->vops;
+ int status = 0;
+
+ if (vp == NULL) {
+ return -EINVAL;
+ }
+
+ if (vops->reclaim != NULL) {
+ status = vops->reclaim(vp);
+ }
+
+ dynfree(vp);
+ return status;
+}
+
+int
+vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args)
+{
+ const struct vops *vops = vp->vops;
+
+ if (vops == NULL)
+ return -EIO;
+ if (vops->lookup == NULL)
+ return -EIO;
+
+ return vops->lookup(args);
+}
+
+int
+vfs_vop_read(struct vnode *vp, struct sio_txn *sio)
+{
+ const struct vops *vops = vp->vops;
+
+ if (vops == NULL)
+ return -EIO;
+ if (vops->read == NULL)
+ return -EIO;
+
+ return vops->read(vp, sio);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 16:27:56 +0000