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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH 1/6] lib/ramfs: initial import from OSv
git tag: v0.52.0
commit: 00299190414e4c7c5b0f2d74cd11763dac34e5b9
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
lib/ramfs/ramfs.h | 68 ++++
lib/ramfs/ramfs_vfsops.c | 90 ++++++
lib/ramfs/ramfs_vnops.c | 669 +++++++++++++++++++++++++++++++++++++++
3 files changed, 827 insertions(+)
create mode 100644 lib/ramfs/ramfs.h
create mode 100644 lib/ramfs/ramfs_vfsops.c
create mode 100644 lib/ramfs/ramfs_vnops.c
diff --git a/lib/ramfs/ramfs.h b/lib/ramfs/ramfs.h
new file mode 100644
index 00000000..88ccbe72
--- /dev/null
+++ b/lib/ramfs/ramfs.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2006-2007, Kohsuke Ohtani
+ * 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 the author nor the names of any co-contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 _RAMFS_H
+#define _RAMFS_H
+
+#include <osv/prex.h>
+
+/* #define DEBUG_RAMFS 1 */
+
+#ifdef DEBUG_RAMFS
+#define DPRINTF(a) dprintf a
+#else
+#define DPRINTF(a) do {} while (0)
+#endif
+
+#define ASSERT(e) assert(e)
+
+/*
+ * File/directory node for RAMFS
+ */
+struct ramfs_node {
+ struct ramfs_node *rn_next; /* next node in the same directory */
+ struct ramfs_node *rn_child; /* first child node */
+ int rn_type; /* file or directory */
+ char *rn_name; /* name (null-terminated) */
+ size_t rn_namelen; /* length of name not including terminator */
+ size_t rn_size; /* file size */
+ char *rn_buf; /* buffer to the file data */
+ size_t rn_bufsize; /* allocated buffer size */
+ struct timespec rn_ctime;
+ struct timespec rn_atime;
+ struct timespec rn_mtime;
+ int rn_mode;
+ bool rn_owns_buf;
+};
+
+struct ramfs_node *ramfs_allocate_node(const char *name, int type);
+
+void ramfs_free_node(struct ramfs_node *node);
+
+#endif /* !_RAMFS_H */
diff --git a/lib/ramfs/ramfs_vfsops.c b/lib/ramfs/ramfs_vfsops.c
new file mode 100644
index 00000000..72fe7edb
--- /dev/null
+++ b/lib/ramfs/ramfs_vfsops.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2006-2007, Kohsuke Ohtani
+ * 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 the author nor the names of any co-contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <errno.h>
+
+#include <osv/vnode.h>
+#include <osv/mount.h>
+#include <osv/dentry.h>
+
+#include "ramfs.h"
+
+extern struct vnops ramfs_vnops;
+
+static int ramfs_mount(struct mount *mp, const char *dev, int flags, const
void *data);
+
+static int ramfs_unmount(struct mount *mp, int flags);
+
+#define ramfs_sync ((vfsop_sync_t)vfs_nullop)
+#define ramfs_vget ((vfsop_vget_t)vfs_nullop)
+#define ramfs_statfs ((vfsop_statfs_t)vfs_nullop)
+
+/*
+ * File system operations
+ */
+struct vfsops ramfs_vfsops = {
+ ramfs_mount, /* mount */
+ ramfs_unmount, /* unmount */
+ ramfs_sync, /* sync */
+ ramfs_vget, /* vget */
+ ramfs_statfs, /* statfs */
+ &ramfs_vnops, /* vnops */
+};
+
+/*
+ * Mount a file system.
+ */
+static int
+ramfs_mount(struct mount *mp, const char *dev, int flags, const void *data)
+{
+ struct ramfs_node *np;
+
+ DPRINTF(("ramfs_mount: dev=%s\n", dev));
+
+ /* Create a root node */
+ np = ramfs_allocate_node("/", VDIR);
+ if (np == NULL)
+ return ENOMEM;
+ mp->m_root->d_vnode->v_data = np;
+ return 0;
+}
+
+/*
+ * Unmount a file system.
+ *
+ * NOTE: Currently, we don't support unmounting of the RAMFS. This is
+ * because we have to deallocate all nodes included in all sub
+ * directories, and it requires more work...
+ */
+static int
+ramfs_unmount(struct mount *mp, int flags)
+{
+ release_mp_dentries(mp);
+ return 0;
+}
diff --git a/lib/ramfs/ramfs_vnops.c b/lib/ramfs/ramfs_vnops.c
new file mode 100644
index 00000000..9291a4ec
--- /dev/null
+++ b/lib/ramfs/ramfs_vnops.c
@@ -0,0 +1,669 @@
+/*
+ * Copyright (c) 2006-2007, Kohsuke Ohtani
+ * 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 the author nor the names of any co-contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * rmafs_vnops.c - vnode operations for RAM file system.
+ */
+
+#include <sys/stat.h>
+#include <dirent.h>
+#include <sys/param.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+#include <osv/prex.h>
+#include <osv/vnode.h>
+#include <osv/file.h>
+#include <osv/mount.h>
+#include <osv/vnode_attr.h>
+
+#include "ramfs.h"
+
+static mutex_t ramfs_lock = MUTEX_INITIALIZER;
+static uint64_t inode_count = 1; /* inode 0 is reserved to root */
+
+static void
+set_times_to_now(struct timespec *time1, struct timespec *time2 = nullptr,
struct timespec *time3 = nullptr)
+{
+ struct timespec now;
+ clock_gettime(CLOCK_REALTIME, &now);
+ if (time1) {
+ memcpy(time1, &now, sizeof(struct timespec));
+ }
+ if (time2) {
+ memcpy(time2, &now, sizeof(struct timespec));
+ }
+ if (time3) {
+ memcpy(time3, &now, sizeof(struct timespec));
+ }
+}
+
+struct ramfs_node *
+ramfs_allocate_node(const char *name, int type)
+{
+ struct ramfs_node *np;
+
+ np = (ramfs_node *) malloc(sizeof(struct ramfs_node));
+ if (np == NULL)
+ return NULL;
+ memset(np, 0, sizeof(struct ramfs_node));
+
+ np->rn_namelen = strlen(name);
+ np->rn_name = (char *) malloc(np->rn_namelen + 1);
+ if (np->rn_name == NULL) {
+ free(np);
+ return NULL;
+ }
+ strlcpy(np->rn_name, name, np->rn_namelen + 1);
+ np->rn_type = type;
+
+ if (type == VDIR)
+ np->rn_mode = S_IFDIR|0777;
+ else if (type == VLNK)
+ np->rn_mode = S_IFLNK|0777;
+ else
+ np->rn_mode = S_IFREG|0777;
+
+ set_times_to_now(&(np->rn_ctime), &(np->rn_atime), &(np->rn_mtime));
+ np->rn_owns_buf = true;
+
+ return np;
+}
+
+void
+ramfs_free_node(struct ramfs_node *np)
+{
+ if (np->rn_buf != NULL && np->rn_owns_buf)
+ free(np->rn_buf);
+
+ free(np->rn_name);
+ free(np);
+}
+
+static struct ramfs_node *
+ramfs_add_node(struct ramfs_node *dnp, char *name, int type)
+{
+ struct ramfs_node *np, *prev;
+
+ np = ramfs_allocate_node(name, type);
+ if (np == NULL)
+ return NULL;
+
+ mutex_lock(&ramfs_lock);
+
+ /* Link to the directory list */
+ if (dnp->rn_child == NULL) {
+ dnp->rn_child = np;
+ } else {
+ prev = dnp->rn_child;
+ while (prev->rn_next != NULL)
+ prev = prev->rn_next;
+ prev->rn_next = np;
+ }
+
+ set_times_to_now(&(dnp->rn_mtime), &(dnp->rn_ctime));
+
+ mutex_unlock(&ramfs_lock);
+ return np;
+}
+
+static int
+ramfs_remove_node(struct ramfs_node *dnp, struct ramfs_node *np)
+{
+ struct ramfs_node *prev;
+
+ if (dnp->rn_child == NULL)
+ return EBUSY;
+
+ mutex_lock(&ramfs_lock);
+
+ /* Unlink from the directory list */
+ if (dnp->rn_child == np) {
+ dnp->rn_child = np->rn_next;
+ } else {
+ for (prev = dnp->rn_child; prev->rn_next != np;
+ prev = prev->rn_next) {
+ if (prev->rn_next == NULL) {
+ mutex_unlock(&ramfs_lock);
+ return ENOENT;
+ }
+ }
+ prev->rn_next = np->rn_next;
+ }
+ ramfs_free_node(np);
+
+ set_times_to_now(&(dnp->rn_mtime), &(dnp->rn_ctime));
+
+ mutex_unlock(&ramfs_lock);
+ return 0;
+}
+
+static int
+ramfs_rename_node(struct ramfs_node *np, char *name)
+{
+ size_t len;
+ char *tmp;
+
+ len = strlen(name);
+ if (len > NAME_MAX) {
+ return ENAMETOOLONG;
+ }
+ if (len <= np->rn_namelen) {
+ /* Reuse current name buffer */
+ strlcpy(np->rn_name, name, np->rn_namelen + 1);
+ } else {
+ /* Expand name buffer */
+ tmp = (char *) malloc(len + 1);
+ if (tmp == NULL)
+ return ENOMEM;
+ strlcpy(tmp, name, len + 1);
+ free(np->rn_name);
+ np->rn_name = tmp;
+ }
+ np->rn_namelen = len;
+ set_times_to_now(&(np->rn_ctime));
+ return 0;
+}
+
+static int
+ramfs_lookup(struct vnode *dvp, char *name, struct vnode **vpp)
+{
+ struct ramfs_node *np, *dnp;
+ struct vnode *vp;
+ size_t len;
+ int found;
+
+ *vpp = NULL;
+
+ if (*name == '\0')
+ return ENOENT;
+
+ mutex_lock(&ramfs_lock);
+
+ len = strlen(name);
+ dnp = (ramfs_node *) dvp->v_data;
+ found = 0;
+ for (np = dnp->rn_child; np != NULL; np = np->rn_next) {
+ if (np->rn_namelen == len &&
+ memcmp(name, np->rn_name, len) == 0) {
+ found = 1;
+ break;
+ }
+ }
+ if (found == 0) {
+ mutex_unlock(&ramfs_lock);
+ return ENOENT;
+ }
+ if (vget(dvp->v_mount, inode_count++, &vp)) {
+ /* found in cache */
+ *vpp = vp;
+ mutex_unlock(&ramfs_lock);
+ return 0;
+ }
+ if (!vp) {
+ mutex_unlock(&ramfs_lock);
+ return ENOMEM;
+ }
+ vp->v_data = np;
+ vp->v_mode = ALLPERMS;
+ vp->v_type = np->rn_type;
+ vp->v_size = np->rn_size;
+
+ mutex_unlock(&ramfs_lock);
+
+ *vpp = vp;
+
+ return 0;
+}
+
+static int
+ramfs_mkdir(struct vnode *dvp, char *name, mode_t mode)
+{
+ struct ramfs_node *np;
+
+ DPRINTF(("mkdir %s\n", name));
+ if (strlen(name) > NAME_MAX) {
+ return ENAMETOOLONG;
+ }
+
+ if (!S_ISDIR(mode))
+ return EINVAL;
+
+ np = (ramfs_node *) ramfs_add_node((ramfs_node *) dvp->v_data, name, VDIR);
+ if (np == NULL)
+ return ENOMEM;
+ np->rn_size = 0;
+
+ return 0;
+}
+
+static int
+ramfs_symlink(struct vnode *dvp, char *name, char *link)
+{
+ if (strlen(name) > NAME_MAX) {
+ return ENAMETOOLONG;
+ }
+ auto np = ramfs_add_node((ramfs_node *) dvp->v_data, name, VLNK);
+ if (np == NULL)
+ return ENOMEM;
+ // Save the link target without the final null, as readlink() wants it.
+ size_t len = strlen(link);
+ np->rn_buf = strndup(link, len);
+ np->rn_bufsize = np->rn_size = len;
+
+ return 0;
+}
+
+static int
+ramfs_readlink(struct vnode *vp, struct uio *uio)
+{
+ struct ramfs_node *np = (ramfs_node *) vp->v_data;
+ size_t len;
+
+ if (vp->v_type != VLNK) {
+ return EINVAL;
+ }
+ if (uio->uio_offset < 0) {
+ return EINVAL;
+ }
+ if (uio->uio_resid == 0) {
+ return 0;
+ }
+ if (uio->uio_offset >= (off_t) vp->v_size)
+ return 0;
+ if (vp->v_size - uio->uio_offset < uio->uio_resid)
+ len = vp->v_size - uio->uio_offset;
+ else
+ len = uio->uio_resid;
+
+ set_times_to_now( &(np->rn_atime));
+ return uiomove(np->rn_buf + uio->uio_offset, len, uio);
+}
+
+/* Remove a directory */
+static int
+ramfs_rmdir(struct vnode *dvp, struct vnode *vp, char *name)
+{
+ return ramfs_remove_node((ramfs_node *) dvp->v_data, (ramfs_node *)
vp->v_data);
+}
+
+/* Remove a file */
+static int
+ramfs_remove(struct vnode *dvp, struct vnode *vp, char *name)
+{
+ DPRINTF(("remove %s in %s\n", name, dvp->v_path));
+ return ramfs_remove_node((ramfs_node *) dvp->v_data, (ramfs_node *)
vp->v_data);
+}
+
+/* Truncate file */
+static int
+ramfs_truncate(struct vnode *vp, off_t length)
+{
+ struct ramfs_node *np;
+ void *new_buf;
+ size_t new_size;
+
+ DPRINTF(("truncate %s length=%d\n", vp->v_path, length));
+ np = (ramfs_node *) vp->v_data;
+
+ if (length == 0) {
+ if (np->rn_buf != NULL) {
+ if(np->rn_owns_buf)
+ free(np->rn_buf);
+ np->rn_buf = NULL;
+ np->rn_bufsize = 0;
+ }
+ } else if (size_t(length) > np->rn_bufsize) {
+ // XXX: this could use a page level allocator
+ new_size = round_page(length);
+ new_buf = malloc(new_size);
+ if (!new_buf)
+ return EIO;
+ if (np->rn_size != 0) {
+ memcpy(new_buf, np->rn_buf, vp->v_size);
+ if(np->rn_owns_buf)
+ free(np->rn_buf);
+ }
+ np->rn_buf = (char *) new_buf;
+ np->rn_bufsize = new_size;
+ np->rn_owns_buf = true;
+ }
+ np->rn_size = length;
+ vp->v_size = length;
+ set_times_to_now(&(np->rn_mtime), &(np->rn_ctime));
+ return 0;
+}
+
+/*
+ * Create empty file.
+ */
+static int
+ramfs_create(struct vnode *dvp, char *name, mode_t mode)
+{
+ struct ramfs_node *np;
+
+ if (strlen(name) > NAME_MAX) {
+ return ENAMETOOLONG;
+ }
+
+ DPRINTF(("create %s in %s\n", name, dvp->v_path));
+ if (!S_ISREG(mode))
+ return EINVAL;
+
+ np = ramfs_add_node((ramfs_node *) dvp->v_data, name, VREG);
+ if (np == NULL)
+ return ENOMEM;
+ return 0;
+}
+
+static int
+ramfs_read(struct vnode *vp, struct file *fp, struct uio *uio, int ioflag)
+{
+ struct ramfs_node *np = (ramfs_node *) vp->v_data;
+ size_t len;
+
+ if (vp->v_type == VDIR) {
+ return EISDIR;
+ }
+ if (vp->v_type != VREG) {
+ return EINVAL;
+ }
+ if (uio->uio_offset < 0) {
+ return EINVAL;
+ }
+ if (uio->uio_resid == 0) {
+ return 0;
+ }
+
+ if (uio->uio_offset >= (off_t) vp->v_size)
+ return 0;
+
+ if (vp->v_size - uio->uio_offset < uio->uio_resid)
+ len = vp->v_size - uio->uio_offset;
+ else
+ len = uio->uio_resid;
+
+ set_times_to_now(&(np->rn_atime));
+
+ return uiomove(np->rn_buf + uio->uio_offset, len, uio);
+}
+
+int
+ramfs_set_file_data(struct vnode *vp, const void *data, size_t size)
+{
+ struct ramfs_node *np = (ramfs_node *) vp->v_data;
+
+ if (vp->v_type == VDIR) {
+ return EISDIR;
+ }
+ if (vp->v_type != VREG) {
+ return EINVAL;
+ }
+ if (np->rn_buf) {
+ return EINVAL;
+ }
+
+ np->rn_buf = (char *) data;
+ np->rn_bufsize = size;
+ np->rn_size = size;
+ vp->v_size = size;
+ np->rn_owns_buf = false;
+
+ return 0;
+}
+
+static int
+ramfs_write(struct vnode *vp, struct uio *uio, int ioflag)
+{
+ struct ramfs_node *np = (ramfs_node *) vp->v_data;
+
+ if (vp->v_type == VDIR) {
+ return EISDIR;
+ }
+ if (vp->v_type != VREG) {
+ return EINVAL;
+ }
+ if (uio->uio_offset < 0) {
+ return EINVAL;
+ }
+ if (uio->uio_offset >= LONG_MAX) {
+ return EFBIG;
+ }
+ if (uio->uio_resid == 0) {
+ return 0;
+ }
+
+ if (ioflag & IO_APPEND)
+ uio->uio_offset = np->rn_size;
+
+ if (size_t(uio->uio_offset + uio->uio_resid) > (size_t) vp->v_size) {
+ /* Expand the file size before writing to it */
+ off_t end_pos = uio->uio_offset + uio->uio_resid;
+ if (end_pos > (off_t) np->rn_bufsize) {
+ // XXX: this could use a page level allocator
+ size_t new_size = round_page(end_pos);
+ void *new_buf = malloc(new_size);
+ if (!new_buf)
+ return EIO;
+ if (np->rn_size != 0) {
+ memcpy(new_buf, np->rn_buf, vp->v_size);
+ if(np->rn_owns_buf)
+ free(np->rn_buf);
+ }
+ np->rn_buf = (char *) new_buf;
+ np->rn_bufsize = new_size;
+ }
+ np->rn_size = end_pos;
+ vp->v_size = end_pos;
+ np->rn_owns_buf = true;
+ }
+
+ set_times_to_now(&(np->rn_mtime), &(np->rn_ctime));
+ return uiomove(np->rn_buf + uio->uio_offset, uio->uio_resid, uio);
+}
+
+static int
+ramfs_rename(struct vnode *dvp1, struct vnode *vp1, char *name1,
+ struct vnode *dvp2, struct vnode *vp2, char *name2)
+{
+ struct ramfs_node *np, *old_np;
+ int error;
+
+ if (vp2) {
+ /* Remove destination file, first */
+ error = ramfs_remove_node((ramfs_node *) dvp2->v_data, (ramfs_node *)
vp2->v_data);
+ if (error)
+ return error;
+ }
+ /* Same directory ? */
+ if (dvp1 == dvp2) {
+ /* Change the name of existing file */
+ error = ramfs_rename_node((ramfs_node *) vp1->v_data, name2);
+ if (error)
+ return error;
+ } else {
+ /* Create new file or directory */
+ old_np = (ramfs_node *) vp1->v_data;
+ np = ramfs_add_node((ramfs_node *) dvp2->v_data, name2,
old_np->rn_type);
+ if (np == NULL)
+ return ENOMEM;
+
+ if (old_np->rn_buf) {
+ /* Copy file data */
+ np->rn_buf = old_np->rn_buf;
+ np->rn_size = old_np->rn_size;
+ np->rn_bufsize = old_np->rn_bufsize;
+ old_np->rn_buf = NULL;
+ }
+ /* Remove source file */
+ ramfs_remove_node((ramfs_node *) dvp1->v_data, (ramfs_node *)
vp1->v_data);
+ }
+ return 0;
+}
+
+/*
+ * @vp: vnode of the directory.
+ */
+static int
+ramfs_readdir(struct vnode *vp, struct file *fp, struct dirent *dir)
+{
+ struct ramfs_node *np, *dnp;
+ int i;
+
+ mutex_lock(&ramfs_lock);
+
+ set_times_to_now(&(((ramfs_node *) vp->v_data)->rn_atime));
+
+ if (fp->f_offset == 0) {
+ dir->d_type = DT_DIR;
+ strlcpy((char *) &dir->d_name, ".", sizeof(dir->d_name));
+ } else if (fp->f_offset == 1) {
+ dir->d_type = DT_DIR;
+ strlcpy((char *) &dir->d_name, "..", sizeof(dir->d_name));
+ } else {
+ dnp = (ramfs_node *) vp->v_data;
+ np = dnp->rn_child;
+ if (np == NULL) {
+ mutex_unlock(&ramfs_lock);
+ return ENOENT;
+ }
+
+ for (i = 0; i != (fp->f_offset - 2); i++) {
+ np = np->rn_next;
+ if (np == NULL) {
+ mutex_unlock(&ramfs_lock);
+ return ENOENT;
+ }
+ }
+ if (np->rn_type == VDIR)
+ dir->d_type = DT_DIR;
+ else if (np->rn_type == VLNK)
+ dir->d_type = DT_LNK;
+ else
+ dir->d_type = DT_REG;
+ strlcpy((char *) &dir->d_name, np->rn_name,
+ sizeof(dir->d_name));
+ }
+ dir->d_fileno = fp->f_offset;
+// dir->d_namelen = strlen(dir->d_name);
+
+ fp->f_offset++;
+
+ mutex_unlock(&ramfs_lock);
+ return 0;
+}
+
+int
+ramfs_init(void)
+{
+ return 0;
+}
+
+static int
+ramfs_getattr(struct vnode *vnode, struct vattr *attr)
+{
+ attr->va_nodeid = vnode->v_ino;
+ attr->va_size = vnode->v_size;
+
+ struct ramfs_node *np = (ramfs_node *) vnode->v_data;
+ attr->va_type = (vtype) np->rn_type;
+
+ memcpy(&(attr->va_atime), &(np->rn_atime), sizeof(struct timespec));
+ memcpy(&(attr->va_ctime), &(np->rn_ctime), sizeof(struct timespec));
+ memcpy(&(attr->va_mtime), &(np->rn_mtime), sizeof(struct timespec));
+
+ attr->va_mode = np->rn_mode;
+
+ return 0;
+}
+
+static int
+ramfs_setattr(struct vnode *vnode, struct vattr *attr) {
+ struct ramfs_node *np = (ramfs_node *) vnode->v_data;
+
+ if (attr->va_mask & AT_ATIME) {
+ memcpy(&(np->rn_atime), &(attr->va_atime), sizeof(struct timespec));
+ }
+
+ if (attr->va_mask & AT_CTIME) {
+ memcpy(&(np->rn_ctime), &(attr->va_ctime), sizeof(struct timespec));
+ }
+
+ if (attr->va_mask & AT_MTIME) {
+ memcpy(&(np->rn_mtime), &(attr->va_mtime), sizeof(struct timespec));
+ }
+
+ if (attr->va_mask & AT_MODE) {
+ np->rn_mode = attr->va_mode;
+ }
+
+ return 0;
+}
+
+#define ramfs_open ((vnop_open_t)vop_nullop)
+#define ramfs_close ((vnop_close_t)vop_nullop)
+#define ramfs_seek ((vnop_seek_t)vop_nullop)
+#define ramfs_ioctl ((vnop_ioctl_t)vop_einval)
+#define ramfs_fsync ((vnop_fsync_t)vop_nullop)
+#define ramfs_inactive ((vnop_inactive_t)vop_nullop)
+#define ramfs_link ((vnop_link_t)vop_eperm)
+#define ramfs_fallocate ((vnop_fallocate_t)vop_nullop)
+
+/*
+ * vnode operations
+ */
+struct vnops ramfs_vnops = {
+ ramfs_open, /* open */
+ ramfs_close, /* close */
+ ramfs_read, /* read */
+ ramfs_write, /* write */
+ ramfs_seek, /* seek */
+ ramfs_ioctl, /* ioctl */
+ ramfs_fsync, /* fsync */
+ ramfs_readdir, /* readdir */
+ ramfs_lookup, /* lookup */
+ ramfs_create, /* create */
+ ramfs_remove, /* remove */
+ ramfs_rename, /* remame */
+ ramfs_mkdir, /* mkdir */
+ ramfs_rmdir, /* rmdir */
+ ramfs_getattr, /* getattr */
+ ramfs_setattr, /* setattr */
+ ramfs_inactive, /* inactive */
+ ramfs_truncate, /* truncate */
+ ramfs_link, /* link */
+ (vnop_cache_t) nullptr, /* arc */
+ ramfs_fallocate, /* fallocate */
+ ramfs_readlink, /* read link */
+ ramfs_symlink, /* symbolic link */
+};
+
--
2.19.2
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