Add Hooks for Linux Inode Operations

The Linux specific inode operations have all been located in the
file zpl_inode.c.  These functions primarily rely on the reworked
zfs_* functions to do their job.  They are also responsible for
converting the possible Solaris style error codes to negative
Linux errors.

diff --git a/module/zfs/zpl_inode.c b/module/zfs/zpl_inode.c
new file mode 100644 (file)
index 0000000..e866dcd
--- /dev/null
+++ b/module/zfs/zpl_inode.c
@@ -0,0 +1,331 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
+ */
+
+
+#include <sys/zfs_vfsops.h>
+#include <sys/zfs_vnops.h>
+#include <sys/vfs.h>
+#include <sys/zpl.h>
+
+
+static struct dentry *
+zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+       struct inode *ip;
+       cred_t *cr;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
+       ASSERT3S(error, <=, 0);
+       put_cred(cr);
+
+       if (error) {
+               if (error == -ENOENT)
+                       return d_splice_alias(NULL, dentry);
+               else
+                       return ERR_PTR(error);
+       }
+
+       return d_splice_alias(ip, dentry);
+}
+
+static int
+zpl_create(struct inode *dir, struct dentry *dentry, int mode,
+    struct nameidata *nd)
+{
+       const struct cred *cred;
+       struct inode *ip;
+       vattr_t *vap;
+       int error;
+
+       cred = get_current_cred();
+       vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
+       vap->va_mode = mode;
+       vap->va_mask = ATTR_MODE;
+       vap->va_uid = current_fsuid();
+       vap->va_gid = current_fsgid();
+
+       error = -zfs_create(dir, (char *)dentry->d_name.name,
+           vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
+       if (error)
+               goto out;
+
+       d_instantiate(dentry, ip);
+out:
+       kmem_free(vap, sizeof(vattr_t));
+       put_cred(cred);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
+{
+        const struct cred *cred;
+       struct inode *ip;
+       vattr_t *vap;
+       int error;
+
+       cred = get_current_cred();
+       vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
+       vap->va_mode = mode;
+       vap->va_mask = ATTR_MODE;
+       vap->va_rdev = rdev;
+       vap->va_uid = current_fsuid();
+       vap->va_gid = current_fsgid();
+
+       error = -zfs_create(dir, (char *)dentry->d_name.name,
+           vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
+       if (error)
+               goto out;
+
+       d_instantiate(dentry, ip);
+out:
+       kmem_free(vap, sizeof(vattr_t));
+       put_cred(cred);
+       ASSERT3S(error, <=, 0);
+
+       return (-error);
+}
+
+static int
+zpl_unlink(struct inode *dir, struct dentry *dentry)
+{
+       cred_t *cr;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_remove(dir, dname(dentry), cr);
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+       cred_t *cr;
+       vattr_t *vap;
+       struct inode *ip;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
+       vap->va_mode = S_IFDIR | mode;
+       vap->va_mask = ATTR_MODE;
+       vap->va_uid = current_fsuid();
+       vap->va_gid = current_fsgid();
+
+       error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
+       if (error)
+               goto out;
+
+       d_instantiate(dentry, ip);
+out:
+       kmem_free(vap, sizeof(vattr_t));
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_rmdir(struct inode * dir, struct dentry *dentry)
+{
+       cred_t *cr;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+       cred_t *cr;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_getattr(dentry->d_inode, stat, 0, cr);
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       cred_t *cr;
+       int error;
+
+       error = inode_change_ok(dentry->d_inode, attr);
+       if (error)
+               return (error);
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_setattr(dentry->d_inode, attr, 0, cr);
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (-error);
+}
+
+static int
+zpl_rename(struct inode *sdip, struct dentry *sdentry,
+    struct inode *tdip, struct dentry *tdentry)
+{
+       cred_t *cr;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static int
+zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
+{
+       cred_t *cr;
+       vattr_t *vap;
+       struct inode *ip;
+       int error;
+
+       cr = (cred_t *)get_current_cred();
+       vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
+       vap->va_mode = S_IFLNK | S_IRWXUGO;
+       vap->va_mask = ATTR_MODE;
+       vap->va_uid = current_fsuid();
+       vap->va_gid = current_fsgid();
+
+       error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
+       if (error)
+               goto out;
+
+       d_instantiate(dentry, ip);
+out:
+       kmem_free(vap, sizeof(vattr_t));
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+static void *
+zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+       (void) zfs_follow_link(dentry, nd);
+       return NULL;
+}
+
+static void
+zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
+{
+       char *link;
+
+       link = nd_get_link(nd);
+       if (!IS_ERR(link))
+               kmem_free(link, MAXPATHLEN + 1);
+}
+
+static int
+zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
+{
+       struct inode *ip = old_dentry->d_inode;
+       cred_t *cr;
+       int error;
+
+       if (ip->i_nlink >= ZFS_LINK_MAX)
+               return -EMLINK;
+
+       cr = (cred_t *)get_current_cred();
+       ip->i_ctime = CURRENT_TIME_SEC;
+       igrab(ip); /* Use ihold() if available */
+
+       error = -zfs_link(dir, ip, dname(dentry), cr);
+       if (error) {
+               iput(ip);
+               goto out;
+       }
+
+       d_instantiate(dentry, ip);
+out:
+       put_cred(cr);
+       ASSERT3S(error, <=, 0);
+
+       return (error);
+}
+
+const struct inode_operations zpl_inode_operations = {
+       .check_acl      = NULL,
+       .create         = zpl_create,
+       .link           = zpl_link,
+       .unlink         = zpl_unlink,
+       .symlink        = zpl_symlink,
+       .mkdir          = zpl_mkdir,
+       .rmdir          = zpl_rmdir,
+       .mknod          = zpl_mknod,
+       .rename         = zpl_rename,
+       .setattr        = zpl_setattr,
+       .getattr        = zpl_getattr,
+       .setxattr       = generic_setxattr,
+       .getxattr       = generic_getxattr,
+       .removexattr    = generic_removexattr,
+       .listxattr      = zpl_xattr_list,
+};
+
+const struct inode_operations zpl_dir_inode_operations = {
+       .check_acl      = NULL,
+       .create         = zpl_create,
+       .lookup         = zpl_lookup,
+       .link           = zpl_link,
+       .unlink         = zpl_unlink,
+       .symlink        = zpl_symlink,
+       .mkdir          = zpl_mkdir,
+       .rmdir          = zpl_rmdir,
+       .mknod          = zpl_mknod,
+       .rename         = zpl_rename,
+       .setattr        = zpl_setattr,
+};
+
+const struct inode_operations zpl_symlink_inode_operations = {
+       .check_acl      = NULL,
+       .readlink       = generic_readlink,
+       .follow_link    = zpl_follow_link,
+       .put_link       = zpl_put_link,
+};
+
+const struct inode_operations zpl_special_inode_operations = {
+       .check_acl      = NULL,
+};