--- /dev/null
+/*
+ * 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/zfs_znode.h>
+#include <sys/zfs_ctldir.h>
+#include <sys/zpl.h>
+
+
+static struct inode *
+zpl_inode_alloc(struct super_block *sb)
+{
+ struct inode *ip;
+
+ VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0);
+ ip->i_version = 1;
+
+ return (ip);
+}
+
+static void
+zpl_inode_destroy(struct inode *ip)
+{
+ ASSERT(atomic_read(&ip->i_count) == 0);
+ zfs_inode_destroy(ip);
+}
+
+/*
+ * Called from __mark_inode_dirty() to reflect that something in the
+ * inode has changed. We use it to ensure the znode system attributes
+ * are always strictly update to date with respect to the inode.
+ */
+#ifdef HAVE_DIRTY_INODE_WITH_FLAGS
+static void
+zpl_dirty_inode(struct inode *ip, int flags)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ zfs_dirty_inode(ip, flags);
+ spl_fstrans_unmark(cookie);
+}
+#else
+static void
+zpl_dirty_inode(struct inode *ip)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ zfs_dirty_inode(ip, 0);
+ spl_fstrans_unmark(cookie);
+}
+#endif /* HAVE_DIRTY_INODE_WITH_FLAGS */
+
+/*
+ * When ->drop_inode() is called its return value indicates if the
+ * inode should be evicted from the inode cache. If the inode is
+ * unhashed and has no links the default policy is to evict it
+ * immediately.
+ *
+ * Prior to 2.6.36 this eviction was accomplished by the vfs calling
+ * ->delete_inode(). It was ->delete_inode()'s responsibility to
+ * truncate the inode pages and call clear_inode(). The call to
+ * clear_inode() synchronously invalidates all the buffers and
+ * calls ->clear_inode(). It was ->clear_inode()'s responsibility
+ * to cleanup and filesystem specific data before freeing the inode.
+ *
+ * This elaborate mechanism was replaced by ->evict_inode() which
+ * does the job of both ->delete_inode() and ->clear_inode(). It
+ * will be called exactly once, and when it returns the inode must
+ * be in a state where it can simply be freed.i
+ *
+ * The ->evict_inode() callback must minimally truncate the inode pages,
+ * and call clear_inode(). For 2.6.35 and later kernels this will
+ * simply update the inode state, with the sync occurring before the
+ * truncate in evict(). For earlier kernels clear_inode() maps to
+ * end_writeback() which is responsible for completing all outstanding
+ * write back. In either case, once this is done it is safe to cleanup
+ * any remaining inode specific data via zfs_inactive().
+ * remaining filesystem specific data.
+ */
+#ifdef HAVE_EVICT_INODE
+static void
+zpl_evict_inode(struct inode *ip)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ truncate_setsize(ip, 0);
+ clear_inode(ip);
+ zfs_inactive(ip);
+ spl_fstrans_unmark(cookie);
+}
+
+#else
+
+static void
+zpl_drop_inode(struct inode *ip)
+{
+ generic_delete_inode(ip);
+}
+
+static void
+zpl_clear_inode(struct inode *ip)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ zfs_inactive(ip);
+ spl_fstrans_unmark(cookie);
+}
+
+static void
+zpl_inode_delete(struct inode *ip)
+{
+ truncate_setsize(ip, 0);
+ clear_inode(ip);
+}
+#endif /* HAVE_EVICT_INODE */
+
+static void
+zpl_put_super(struct super_block *sb)
+{
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_umount(sb);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+}
+
+static int
+zpl_sync_fs(struct super_block *sb, int wait)
+{
+ fstrans_cookie_t cookie;
+ cred_t *cr = CRED();
+ int error;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_sync(sb, wait, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_statfs(struct dentry *dentry, struct kstatfs *statp)
+{
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_statvfs(dentry, statp);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+enum {
+ TOKEN_RO,
+ TOKEN_RW,
+ TOKEN_SETUID,
+ TOKEN_NOSETUID,
+ TOKEN_EXEC,
+ TOKEN_NOEXEC,
+ TOKEN_DEVICES,
+ TOKEN_NODEVICES,
+ TOKEN_DIRXATTR,
+ TOKEN_SAXATTR,
+ TOKEN_XATTR,
+ TOKEN_NOXATTR,
+ TOKEN_ATIME,
+ TOKEN_NOATIME,
+ TOKEN_RELATIME,
+ TOKEN_NORELATIME,
+ TOKEN_NBMAND,
+ TOKEN_NONBMAND,
+ TOKEN_MNTPOINT,
+ TOKEN_LAST,
+};
+
+static const match_table_t zpl_tokens = {
+ { TOKEN_RO, MNTOPT_RO },
+ { TOKEN_RW, MNTOPT_RW },
+ { TOKEN_SETUID, MNTOPT_SETUID },
+ { TOKEN_NOSETUID, MNTOPT_NOSETUID },
+ { TOKEN_EXEC, MNTOPT_EXEC },
+ { TOKEN_NOEXEC, MNTOPT_NOEXEC },
+ { TOKEN_DEVICES, MNTOPT_DEVICES },
+ { TOKEN_NODEVICES, MNTOPT_NODEVICES },
+ { TOKEN_DIRXATTR, MNTOPT_DIRXATTR },
+ { TOKEN_SAXATTR, MNTOPT_SAXATTR },
+ { TOKEN_XATTR, MNTOPT_XATTR },
+ { TOKEN_NOXATTR, MNTOPT_NOXATTR },
+ { TOKEN_ATIME, MNTOPT_ATIME },
+ { TOKEN_NOATIME, MNTOPT_NOATIME },
+ { TOKEN_RELATIME, MNTOPT_RELATIME },
+ { TOKEN_NORELATIME, MNTOPT_NORELATIME },
+ { TOKEN_NBMAND, MNTOPT_NBMAND },
+ { TOKEN_NONBMAND, MNTOPT_NONBMAND },
+ { TOKEN_MNTPOINT, MNTOPT_MNTPOINT "=%s" },
+ { TOKEN_LAST, NULL },
+};
+
+static int
+zpl_parse_option(char *option, int token, substring_t *args, zfs_mntopts_t *zmo)
+{
+ switch (token) {
+ case TOKEN_RO:
+ zmo->z_readonly = B_TRUE;
+ zmo->z_do_readonly = B_TRUE;
+ break;
+ case TOKEN_RW:
+ zmo->z_readonly = B_FALSE;
+ zmo->z_do_readonly = B_TRUE;
+ break;
+ case TOKEN_SETUID:
+ zmo->z_setuid = B_TRUE;
+ zmo->z_do_setuid = B_TRUE;
+ break;
+ case TOKEN_NOSETUID:
+ zmo->z_setuid = B_FALSE;
+ zmo->z_do_setuid = B_TRUE;
+ break;
+ case TOKEN_EXEC:
+ zmo->z_exec = B_TRUE;
+ zmo->z_do_exec = B_TRUE;
+ break;
+ case TOKEN_NOEXEC:
+ zmo->z_exec = B_FALSE;
+ zmo->z_do_exec = B_TRUE;
+ break;
+ case TOKEN_DEVICES:
+ zmo->z_devices = B_TRUE;
+ zmo->z_do_devices = B_TRUE;
+ break;
+ case TOKEN_NODEVICES:
+ zmo->z_devices = B_FALSE;
+ zmo->z_do_devices = B_TRUE;
+ break;
+ case TOKEN_DIRXATTR:
+ zmo->z_xattr = ZFS_XATTR_DIR;
+ zmo->z_do_xattr = B_TRUE;
+ break;
+ case TOKEN_SAXATTR:
+ zmo->z_xattr = ZFS_XATTR_SA;
+ zmo->z_do_xattr = B_TRUE;
+ break;
+ case TOKEN_XATTR:
+ zmo->z_xattr = ZFS_XATTR_DIR;
+ zmo->z_do_xattr = B_TRUE;
+ break;
+ case TOKEN_NOXATTR:
+ zmo->z_xattr = ZFS_XATTR_OFF;
+ zmo->z_do_xattr = B_TRUE;
+ break;
+ case TOKEN_ATIME:
+ zmo->z_atime = B_TRUE;
+ zmo->z_do_atime = B_TRUE;
+ break;
+ case TOKEN_NOATIME:
+ zmo->z_atime = B_FALSE;
+ zmo->z_do_atime = B_TRUE;
+ break;
+ case TOKEN_RELATIME:
+ zmo->z_relatime = B_TRUE;
+ zmo->z_do_relatime = B_TRUE;
+ break;
+ case TOKEN_NORELATIME:
+ zmo->z_relatime = B_FALSE;
+ zmo->z_do_relatime = B_TRUE;
+ break;
+ case TOKEN_NBMAND:
+ zmo->z_nbmand = B_TRUE;
+ zmo->z_do_nbmand = B_TRUE;
+ break;
+ case TOKEN_NONBMAND:
+ zmo->z_nbmand = B_FALSE;
+ zmo->z_do_nbmand = B_TRUE;
+ break;
+ case TOKEN_MNTPOINT:
+ zmo->z_mntpoint = match_strdup(&args[0]);
+ if (zmo->z_mntpoint == NULL)
+ return (-ENOMEM);
+
+ break;
+ default:
+ break;
+ }
+
+ return (0);
+}
+
+/*
+ * Parse the mntopts string storing the results in provided zmo argument.
+ * If an error occurs the zmo argument will not be modified. The caller
+ * needs to set isremount when recycling an existing zfs_mntopts_t.
+ */
+static int
+zpl_parse_options(char *osname, char *mntopts, zfs_mntopts_t *zmo,
+ boolean_t isremount)
+{
+ zfs_mntopts_t *tmp_zmo;
+ int error;
+
+ tmp_zmo = zfs_mntopts_alloc();
+ tmp_zmo->z_osname = strdup(osname);
+
+ if (mntopts) {
+ substring_t args[MAX_OPT_ARGS];
+ char *tmp_mntopts, *p, *t;
+ int token;
+
+ t = tmp_mntopts = strdup(mntopts);
+
+ while ((p = strsep(&t, ",")) != NULL) {
+ if (!*p)
+ continue;
+
+ args[0].to = args[0].from = NULL;
+ token = match_token(p, zpl_tokens, args);
+ error = zpl_parse_option(p, token, args, tmp_zmo);
+ if (error) {
+ zfs_mntopts_free(tmp_zmo);
+ strfree(tmp_mntopts);
+ return (error);
+ }
+ }
+
+ strfree(tmp_mntopts);
+ }
+
+ if (isremount == B_TRUE) {
+ if (zmo->z_osname)
+ strfree(zmo->z_osname);
+
+ if (zmo->z_mntpoint)
+ strfree(zmo->z_mntpoint);
+ } else {
+ ASSERT3P(zmo->z_osname, ==, NULL);
+ ASSERT3P(zmo->z_mntpoint, ==, NULL);
+ }
+
+ memcpy(zmo, tmp_zmo, sizeof (zfs_mntopts_t));
+ kmem_free(tmp_zmo, sizeof (zfs_mntopts_t));
+
+ return (0);
+}
+
+static int
+zpl_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ zfs_sb_t *zsb = sb->s_fs_info;
+ fstrans_cookie_t cookie;
+ int error;
+
+ error = zpl_parse_options(zsb->z_mntopts->z_osname, data,
+ zsb->z_mntopts, B_TRUE);
+ if (error)
+ return (error);
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_remount(sb, flags, zsb->z_mntopts);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+__zpl_show_options(struct seq_file *seq, zfs_sb_t *zsb)
+{
+ seq_printf(seq, ",%s", zsb->z_flags & ZSB_XATTR ? "xattr" : "noxattr");
+
+#ifdef CONFIG_FS_POSIX_ACL
+ switch (zsb->z_acl_type) {
+ case ZFS_ACLTYPE_POSIXACL:
+ seq_puts(seq, ",posixacl");
+ break;
+ default:
+ seq_puts(seq, ",noacl");
+ break;
+ }
+#endif /* CONFIG_FS_POSIX_ACL */
+
+ return (0);
+}
+
+#ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY
+static int
+zpl_show_options(struct seq_file *seq, struct dentry *root)
+{
+ return (__zpl_show_options(seq, root->d_sb->s_fs_info));
+}
+#else
+static int
+zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
+{
+ return (__zpl_show_options(seq, vfsp->mnt_sb->s_fs_info));
+}
+#endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */
+
+static int
+zpl_fill_super(struct super_block *sb, void *data, int silent)
+{
+ zfs_mntopts_t *zmo = (zfs_mntopts_t *)data;
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_domount(sb, zmo, silent);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+#ifdef HAVE_MOUNT_NODEV
+static struct dentry *
+zpl_mount(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data)
+{
+ zfs_mntopts_t *zmo = zfs_mntopts_alloc();
+ int error;
+
+ error = zpl_parse_options((char *)osname, (char *)data, zmo, B_FALSE);
+ if (error) {
+ zfs_mntopts_free(zmo);
+ return (ERR_PTR(error));
+ }
+
+ return (mount_nodev(fs_type, flags, zmo, zpl_fill_super));
+}
+#else
+static int
+zpl_get_sb(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data, struct vfsmount *mnt)
+{
+ zfs_mntopts_t *zmo = zfs_mntopts_alloc();
+ int error;
+
+ error = zpl_parse_options((char *)osname, (char *)data, zmo, B_FALSE);
+ if (error) {
+ zfs_mntopts_free(zmo);
+ return (error);
+ }
+
+ return (get_sb_nodev(fs_type, flags, zmo, zpl_fill_super, mnt));
+}
+#endif /* HAVE_MOUNT_NODEV */
+
+static void
+zpl_kill_sb(struct super_block *sb)
+{
+ zfs_preumount(sb);
+ kill_anon_super(sb);
+
+#ifdef HAVE_S_INSTANCES_LIST_HEAD
+ sb->s_instances.next = &(zpl_fs_type.fs_supers);
+#endif /* HAVE_S_INSTANCES_LIST_HEAD */
+}
+
+void
+zpl_prune_sb(int64_t nr_to_scan, void *arg)
+{
+ struct super_block *sb = (struct super_block *)arg;
+ int objects = 0;
+
+ (void) -zfs_sb_prune(sb, nr_to_scan, &objects);
+}
+
+#ifdef HAVE_NR_CACHED_OBJECTS
+static int
+zpl_nr_cached_objects(struct super_block *sb)
+{
+ return (0);
+}
+#endif /* HAVE_NR_CACHED_OBJECTS */
+
+#ifdef HAVE_FREE_CACHED_OBJECTS
+static void
+zpl_free_cached_objects(struct super_block *sb, int nr_to_scan)
+{
+ /* noop */
+}
+#endif /* HAVE_FREE_CACHED_OBJECTS */
+
+const struct super_operations zpl_super_operations = {
+ .alloc_inode = zpl_inode_alloc,
+ .destroy_inode = zpl_inode_destroy,
+ .dirty_inode = zpl_dirty_inode,
+ .write_inode = NULL,
+#ifdef HAVE_EVICT_INODE
+ .evict_inode = zpl_evict_inode,
+#else
+ .drop_inode = zpl_drop_inode,
+ .clear_inode = zpl_clear_inode,
+ .delete_inode = zpl_inode_delete,
+#endif /* HAVE_EVICT_INODE */
+ .put_super = zpl_put_super,
+ .sync_fs = zpl_sync_fs,
+ .statfs = zpl_statfs,
+ .remount_fs = zpl_remount_fs,
+ .show_options = zpl_show_options,
+ .show_stats = NULL,
+#ifdef HAVE_NR_CACHED_OBJECTS
+ .nr_cached_objects = zpl_nr_cached_objects,
+#endif /* HAVE_NR_CACHED_OBJECTS */
+#ifdef HAVE_FREE_CACHED_OBJECTS
+ .free_cached_objects = zpl_free_cached_objects,
+#endif /* HAVE_FREE_CACHED_OBJECTS */
+};
+
+struct file_system_type zpl_fs_type = {
+ .owner = THIS_MODULE,
+ .name = ZFS_DRIVER,
+#ifdef HAVE_MOUNT_NODEV
+ .mount = zpl_mount,
+#else
+ .get_sb = zpl_get_sb,
+#endif /* HAVE_MOUNT_NODEV */
+ .kill_sb = zpl_kill_sb,
+};
projects / mirror_ubuntu-artful-kernel.git / blobdiff