示例#1
0
static zfs_handle_t *libzfs_zfs_snapshot_next(libzfs_handle_t *p_libzfshd, const char *psz_zfs, char *psz_buffer, size_t i_buffer, uint64_t *p_cookie, const char **ppsz_error)
{
        objset_t *p_os;
        size_t i_zfs_len = strlen(psz_zfs);
        int i_error;

        /* Check the size of the zfs name */
        if(i_zfs_len >= i_buffer)
        {
                *ppsz_error = "ZFS name too long to handle snapshots";
                return NULL;
        }

        if(*p_cookie == 0)
                dmu_objset_find(psz_zfs, dmu_objset_prefetch, NULL, DS_FIND_SNAPSHOTS);

top:
        if((i_error = dmu_objset_hold(psz_zfs, FTAG, &p_os)))
        {
                *ppsz_error = "Unable to hold the zfs filesystem";
                return NULL;
        }

        snprintf(psz_buffer, i_buffer, "%s@", psz_zfs);

        if((i_error = dmu_snapshot_list_next(p_os, i_buffer - i_zfs_len - 1,
                                             psz_buffer + i_zfs_len + 1, NULL, p_cookie, NULL)))
                *ppsz_error = "Unable to get the next snapshot";

        dmu_objset_rele(p_os, FTAG);

        zfs_handle_t *p_zfs_snap = NULL;
        if(i_error == 0)
        {
                i_error = dmu_objset_hold(psz_buffer, FTAG, &p_os);
                if(i_error == ENOENT)
                        goto top;

                if(!(p_zfs_snap = libzfs_make_dataset_handle(p_libzfshd, psz_buffer)))
                        *ppsz_error = "Unable to create a zfs handle for the snapshot";
                dmu_objset_rele(p_os, FTAG);
        }
        return p_zfs_snap;
}
示例#2
0
/*
 * Set ZFS_PROP_VOLSIZE set entry point.
 */
int
zvol_set_volsize(const char *name, uint64_t volsize)
{
	zvol_state_t *zv;
	dmu_object_info_t *doi;
	objset_t *os = NULL;
	uint64_t readonly;
	int error;

	mutex_enter(&zvol_state_lock);

	zv = zvol_find_by_name(name);
	if (zv == NULL) {
		error = ENXIO;
		goto out;
	}

	doi = kmem_alloc(sizeof(dmu_object_info_t), KM_SLEEP);

	error = dmu_objset_hold(name, FTAG, &os);
	if (error)
		goto out_doi;

	if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) != 0 ||
	    (error = zvol_check_volsize(volsize,doi->doi_data_block_size)) != 0)
		goto out_doi;

	VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, NULL) == 0);
	if (readonly) {
		error = EROFS;
		goto out_doi;
	}

	if (get_disk_ro(zv->zv_disk) || (zv->zv_flags & ZVOL_RDONLY)) {
		error = EROFS;
		goto out_doi;
	}

	error = zvol_update_volsize(zv, volsize, os);
out_doi:
	kmem_free(doi, sizeof(dmu_object_info_t));
out:
	if (os)
		dmu_objset_rele(os, FTAG);

	mutex_exit(&zvol_state_lock);

	return (error);
}
示例#3
0
文件: dsl_prop.c 项目: Alyseo/zfs
int
dsl_prop_get(const char *dsname, const char *propname,
    int intsz, int numints, void *buf, char *setpoint)
{
	objset_t *os;
	int error;

	error = dmu_objset_hold(dsname, FTAG, &os);
	if (error != 0)
		return (error);

	error = dsl_prop_get_ds(dmu_objset_ds(os), propname,
	    intsz, numints, buf, setpoint);

	dmu_objset_rele(os, FTAG);
	return (error);
}
示例#4
0
static int libzfs_update_stats(zfs_handle_t *p_zfs)
{
        objset_t *p_os;
        nvlist_t *pnv_allprops, *pnv_userprops;
        int i_error;

        if((i_error = dmu_objset_hold(p_zfs->zfs_name, FTAG, &p_os)))
                return i_error;

        dmu_objset_fast_stat(p_os, &p_zfs->zfs_dmustats);

        if((i_error = dsl_prop_get_all(p_os, &pnv_allprops)) == 0)
        {
                dmu_objset_stats(p_os, pnv_allprops);
                if(!p_zfs->zfs_dmustats.dds_inconsistent)
                {
                        if(dmu_objset_type(p_os) == DMU_OST_ZVOL)
                                assert(zvol_get_stats(p_os, pnv_allprops) == 0);
                }
        }

        dmu_objset_rele(p_os, FTAG);

        // Continue processing the stats
        if((pnv_userprops = process_user_props(p_zfs, pnv_allprops)) == NULL)
        {
                nvlist_free(pnv_allprops);
                return 1;
        }

        nvlist_free(p_zfs->zfs_props);
        nvlist_free(p_zfs->zfs_user_props);

        p_zfs->zfs_props = pnv_allprops;
        p_zfs->zfs_user_props = pnv_userprops;

        return 0;
}
示例#5
0
文件: zfs_vfsops.c 项目: nwf/zfs
/*
 * Reopen zfs_sb_t and release VFS ops.
 */
int
zfs_resume_fs(zfs_sb_t *zsb, const char *osname)
{
	int err, err2;
	znode_t *zp;
	uint64_t sa_obj = 0;

	ASSERT(RRM_WRITE_HELD(&zsb->z_teardown_lock));
	ASSERT(RW_WRITE_HELD(&zsb->z_teardown_inactive_lock));

	/*
	 * We already own this, so just hold and rele it to update the
	 * objset_t, as the one we had before may have been evicted.
	 */
	VERIFY0(dmu_objset_hold(osname, zsb, &zsb->z_os));
	VERIFY3P(zsb->z_os->os_dsl_dataset->ds_owner, ==, zsb);
	VERIFY(dsl_dataset_long_held(zsb->z_os->os_dsl_dataset));
	dmu_objset_rele(zsb->z_os, zsb);

	/*
	 * Make sure version hasn't changed
	 */

	err = zfs_get_zplprop(zsb->z_os, ZFS_PROP_VERSION,
	    &zsb->z_version);

	if (err)
		goto bail;

	err = zap_lookup(zsb->z_os, MASTER_NODE_OBJ,
	    ZFS_SA_ATTRS, 8, 1, &sa_obj);

	if (err && zsb->z_version >= ZPL_VERSION_SA)
		goto bail;

	if ((err = sa_setup(zsb->z_os, sa_obj,
	    zfs_attr_table,  ZPL_END, &zsb->z_attr_table)) != 0)
		goto bail;

	if (zsb->z_version >= ZPL_VERSION_SA)
		sa_register_update_callback(zsb->z_os,
		    zfs_sa_upgrade);

	VERIFY(zfs_sb_setup(zsb, B_FALSE) == 0);

	zfs_set_fuid_feature(zsb);
	zsb->z_rollback_time = jiffies;

	/*
	 * Attempt to re-establish all the active inodes with their
	 * dbufs.  If a zfs_rezget() fails, then we unhash the inode
	 * and mark it stale.  This prevents a collision if a new
	 * inode/object is created which must use the same inode
	 * number.  The stale inode will be be released when the
	 * VFS prunes the dentry holding the remaining references
	 * on the stale inode.
	 */
	mutex_enter(&zsb->z_znodes_lock);
	for (zp = list_head(&zsb->z_all_znodes); zp;
	    zp = list_next(&zsb->z_all_znodes, zp)) {
		err2 = zfs_rezget(zp);
		if (err2) {
			remove_inode_hash(ZTOI(zp));
			zp->z_is_stale = B_TRUE;
		}
	}
	mutex_exit(&zsb->z_znodes_lock);

bail:
	/* release the VFS ops */
	rw_exit(&zsb->z_teardown_inactive_lock);
	rrm_exit(&zsb->z_teardown_lock, FTAG);

	if (err) {
		/*
		 * Since we couldn't setup the sa framework, try to force
		 * unmount this file system.
		 */
		if (zsb->z_os)
			(void) zfs_umount(zsb->z_sb);
	}
	return (err);
}
/* ARGSUSED */
static int
zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
    int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
    int *direntflags, pathname_t *realpnp)
{
	zfsctl_snapdir_t *sdp = dvp->v_data;
	objset_t *snap;
	char snapname[MAXNAMELEN];
	char real[MAXNAMELEN];
	char *mountpoint;
	zfs_snapentry_t *sep, search;
	struct mounta margs;
	vfs_t *vfsp;
	size_t mountpoint_len;
	avl_index_t where;
	zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
	int err;

	/*
	 * No extended attributes allowed under .zfs
	 */
	if (flags & LOOKUP_XATTR)
		return (EINVAL);

	ASSERT(dvp->v_type == VDIR);

	/*
	 * If we get a recursive call, that means we got called
	 * from the domount() code while it was trying to look up the
	 * spec (which looks like a local path for zfs).  We need to
	 * add some flag to domount() to tell it not to do this lookup.
	 */
	if (MUTEX_HELD(&sdp->sd_lock))
		return (ENOENT);

	ZFS_ENTER(zfsvfs);

	if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
		ZFS_EXIT(zfsvfs);
		return (0);
	}

	if (flags & FIGNORECASE) {
		boolean_t conflict = B_FALSE;

		err = dmu_snapshot_realname(zfsvfs->z_os, nm, real,
		    MAXNAMELEN, &conflict);
		if (err == 0) {
			nm = real;
		} else if (err != ENOTSUP) {
			ZFS_EXIT(zfsvfs);
			return (err);
		}
		if (realpnp)
			(void) strlcpy(realpnp->pn_buf, nm,
			    realpnp->pn_bufsize);
		if (conflict && direntflags)
			*direntflags = ED_CASE_CONFLICT;
	}

	mutex_enter(&sdp->sd_lock);
	search.se_name = (char *)nm;
	if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) {
		*vpp = sep->se_root;
		VN_HOLD(*vpp);
		err = traverse(vpp);
		if (err) {
			VN_RELE(*vpp);
			*vpp = NULL;
		} else if (*vpp == sep->se_root) {
			/*
			 * The snapshot was unmounted behind our backs,
			 * try to remount it.
			 */
			goto domount;
		} else {
			/*
			 * VROOT was set during the traverse call.  We need
			 * to clear it since we're pretending to be part
			 * of our parent's vfs.
			 */
			(*vpp)->v_flag &= ~VROOT;
		}
		mutex_exit(&sdp->sd_lock);
		ZFS_EXIT(zfsvfs);
		return (err);
	}

	/*
	 * The requested snapshot is not currently mounted, look it up.
	 */
	err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname);
	if (err) {
		mutex_exit(&sdp->sd_lock);
		ZFS_EXIT(zfsvfs);
		/*
		 * handle "ls *" or "?" in a graceful manner,
		 * forcing EILSEQ to ENOENT.
		 * Since shell ultimately passes "*" or "?" as name to lookup
		 */
		return (err == EILSEQ ? ENOENT : err);
	}
	if (dmu_objset_hold(snapname, FTAG, &snap) != 0) {
		mutex_exit(&sdp->sd_lock);
		ZFS_EXIT(zfsvfs);
		return (ENOENT);
	}

	sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP);
	sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
	(void) strcpy(sep->se_name, nm);
	*vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap));
	avl_insert(&sdp->sd_snaps, sep, where);

	dmu_objset_rele(snap, FTAG);
domount:
	mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) +
	    strlen("/.zfs/snapshot/") + strlen(nm) + 1;
	mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP);
	(void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s",
	    refstr_value(dvp->v_vfsp->vfs_mntpt), nm);

	margs.spec = snapname;
	margs.dir = mountpoint;
	margs.flags = MS_SYSSPACE | MS_NOMNTTAB;
	margs.fstype = "zfs";
	margs.dataptr = NULL;
	margs.datalen = 0;
	margs.optptr = NULL;
	margs.optlen = 0;

	err = domount("zfs", &margs, *vpp, kcred, &vfsp);
	kmem_free(mountpoint, mountpoint_len);

	if (err == 0) {
		/*
		 * Return the mounted root rather than the covered mount point.
		 * Takes the GFS vnode at .zfs/snapshot/<snapname> and returns
		 * the ZFS vnode mounted on top of the GFS node.  This ZFS
		 * vnode is the root of the newly created vfsp.
		 */
		VFS_RELE(vfsp);
		err = traverse(vpp);
	}

	if (err == 0) {
		/*
		 * Fix up the root vnode mounted on .zfs/snapshot/<snapname>.
		 *
		 * This is where we lie about our v_vfsp in order to
		 * make .zfs/snapshot/<snapname> accessible over NFS
		 * without requiring manual mounts of <snapname>.
		 */
		ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs);
		VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs;
		(*vpp)->v_vfsp = zfsvfs->z_vfs;
		(*vpp)->v_flag &= ~VROOT;
	}
	mutex_exit(&sdp->sd_lock);
	ZFS_EXIT(zfsvfs);

	/*
	 * If we had an error, drop our hold on the vnode and
	 * zfsctl_snapshot_inactive() will clean up.
	 */
	if (err) {
		VN_RELE(*vpp);
		*vpp = NULL;
	}
	return (err);
}