C++ sa_lookup函数代码示例

/*
 * Handles TX_SYMLINK transactions.
 */
void
zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
    znode_t *dzp, znode_t *zp, char *name, char *link)
{
	itx_t *itx;
	lr_create_t *lr;
	size_t namesize = strlen(name) + 1;
	size_t linksize = strlen(link) + 1;

	if (zil_replaying(zilog, tx))
		return;

	itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize);
	lr = (lr_create_t *)&itx->itx_lr;
	lr->lr_doid = dzp->z_id;
	lr->lr_foid = zp->z_id;
	lr->lr_uid = zp->z_uid;
	lr->lr_gid = zp->z_gid;
	lr->lr_mode = zp->z_mode;
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
	    sizeof (uint64_t));
	(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
	    lr->lr_crtime, sizeof (uint64_t) * 2);
	bcopy(name, (char *)(lr + 1), namesize);
	bcopy(link, (char *)(lr + 1) + namesize, linksize);

	zil_itx_assign(zilog, itx, tx);
}

void
zfs_rmnode(znode_t *zp)
{
    zfsvfs_t	*zfsvfs = zp->z_zfsvfs;
    objset_t	*os = zfsvfs->z_os;
    znode_t		*xzp = NULL;
    dmu_tx_t	*tx;
    uint64_t	acl_obj;
    uint64_t	xattr_obj;
    int		error;

    ASSERT(zp->z_links == 0);
    ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);

    /*
     * If this is an attribute directory, purge its contents.
     */
    if (ZTOV(zp) != NULL && ZTOV(zp)->v_type == VDIR &&
            (zp->z_pflags & ZFS_XATTR)) {
        if (zfs_purgedir(zp) != 0) {
            /*
             * Not enough space to delete some xattrs.
             * Leave it in the unlinked set.
             */
            zfs_znode_dmu_fini(zp);
            zfs_znode_free(zp);
            return;
        }
    } else {
        /*
         * Free up all the data in the file.  We don't do this for
         * XATTR directories because we need truncate and remove to be
         * in the same tx, like in zfs_znode_delete(). Otherwise, if
         * we crash here we'll end up with an inconsistent truncated
         * zap object in the delete queue.  Note a truncated file is
         * harmless since it only contains user data.
         */
        error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
        if (error) {
            /*
             * Not enough space.  Leave the file in the unlinked
             * set.
             */
            zfs_znode_dmu_fini(zp);
            zfs_znode_free(zp);
            return;
        }
    }

    /*
     * If the file has extended attributes, we're going to unlink
     * the xattr dir.
     */
    error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
                      &xattr_obj, sizeof (xattr_obj));
    if (error == 0 && xattr_obj) {
        error = zfs_zget(zfsvfs, xattr_obj, &xzp);
        ASSERT3S(error, ==, 0);
        vn_lock(ZTOV(xzp), LK_EXCLUSIVE | LK_RETRY);
    }

/*
 * Copy an extended attribute into the buffer provided, or compute the
 * required buffer size.
 *
 * If buf is NULL, it computes the required buffer size.
 *
 * Returns 0 on success or a negative error number on failure.
 * On success, the number of bytes used / required is stored in 'size'.
 *
 * No locking is done here.
 */
int __osd_xattr_load(udmu_objset_t *uos, uint64_t dnode, nvlist_t **sa_xattr)
{
	sa_handle_t *sa_hdl;
	char	    *buf;
	int	     rc, size;

	if (unlikely(dnode == ZFS_NO_OBJECT))
		return -ENOENT;

	rc = -sa_handle_get(uos->os, dnode, NULL, SA_HDL_PRIVATE, &sa_hdl);
	if (rc)
		return rc;

	rc = -sa_size(sa_hdl, SA_ZPL_DXATTR(uos), &size);
	if (rc) {
		if (rc == -ENOENT)
			rc = -nvlist_alloc(sa_xattr, NV_UNIQUE_NAME, KM_SLEEP);
		goto out_sa;
	}

	buf = sa_spill_alloc(KM_SLEEP);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto out_sa;
	}
	rc = -sa_lookup(sa_hdl, SA_ZPL_DXATTR(uos), buf, size);
	if (rc == 0)
		rc = -nvlist_unpack(buf, size, sa_xattr, KM_SLEEP);
	sa_spill_free(buf);
out_sa:
	sa_handle_destroy(sa_hdl);

	return rc;
}

static void
ui_delete(char *cmd)
{
	char            cookies_str[ISAKMP_HDR_COOKIES_LEN * 2 + 1];
	char            message_id_str[ISAKMP_HDR_MESSAGE_ID_LEN * 2 + 1];
	u_int8_t        cookies[ISAKMP_HDR_COOKIES_LEN];
	u_int8_t        message_id_buf[ISAKMP_HDR_MESSAGE_ID_LEN];
	u_int8_t       *message_id = message_id_buf;
	struct sa      *sa;

	if (sscanf(cmd, "d %32s %8s", cookies_str, message_id_str) != 2) {
		log_print("ui_delete: command \"%s\" malformed", cmd);
		return;
	}
	if (strcmp(message_id_str, "-") == 0)
		message_id = 0;

	if (hex2raw(cookies_str, cookies, ISAKMP_HDR_COOKIES_LEN) == -1 ||
	    (message_id && hex2raw(message_id_str, message_id_buf,
	    ISAKMP_HDR_MESSAGE_ID_LEN) == -1)) {
		log_print("ui_delete: command \"%s\" has bad arguments", cmd);
		return;
	}
	sa = sa_lookup(cookies, message_id);
	if (!sa) {
		log_print("ui_delete: command \"%s\" found no SA", cmd);
		return;
	}
	LOG_DBG((LOG_UI, 20,
	    "ui_delete: deleting SA for cookie \"%s\" msgid \"%s\"",
	    cookies_str, message_id_str));
	sa_delete(sa, 1);
}

int
zfs_sa_get_xattr(znode_t *zp)
{
	zfs_sb_t *zsb = ZTOZSB(zp);
	char *obj;
	int size;
	int error;

	ASSERT(RW_LOCK_HELD(&zp->z_xattr_lock));
	ASSERT(!zp->z_xattr_cached);
	ASSERT(zp->z_is_sa);

	error = sa_size(zp->z_sa_hdl, SA_ZPL_DXATTR(zsb), &size);
	if (error) {
		if (error == ENOENT)
			return nvlist_alloc(&zp->z_xattr_cached,
			    NV_UNIQUE_NAME, KM_SLEEP);
		else
			return (error);
	}

	obj = zio_buf_alloc(size);

	error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DXATTR(zsb), obj, size);
	if (error == 0)
		error = nvlist_unpack(obj, size, &zp->z_xattr_cached, KM_SLEEP);

	zio_buf_free(obj, size);

	return (error);
}

int __osd_xattr_load(struct osd_device *osd, uint64_t dnode, nvlist_t **sa)
{
	sa_handle_t *sa_hdl;
	char	    *buf;
	int	     rc, size;

	if (unlikely(dnode == ZFS_NO_OBJECT))
		return -ENOENT;

	rc = -sa_handle_get(osd->od_os, dnode, NULL, SA_HDL_PRIVATE, &sa_hdl);
	if (rc)
		return rc;

	rc = -sa_size(sa_hdl, SA_ZPL_DXATTR(osd), &size);
	if (rc) {
		if (rc == -ENOENT)
			rc = -nvlist_alloc(sa, NV_UNIQUE_NAME, KM_SLEEP);
		goto out_sa;
	}

	buf = osd_zio_buf_alloc(size);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto out_sa;
	}
	rc = -sa_lookup(sa_hdl, SA_ZPL_DXATTR(osd), buf, size);
	if (rc == 0)
		rc = -nvlist_unpack(buf, size, sa, KM_SLEEP);
	osd_zio_buf_free(buf, size);
out_sa:
	sa_handle_destroy(sa_hdl);

	return rc;
}

void
zfs_sa_get_scanstamp(znode_t *zp, xvattr_t *xvap)
{
	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
	xoptattr_t *xoap;

	ASSERT(MUTEX_HELD(&zp->z_lock));
	VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
	if (zp->z_is_sa) {
		if (sa_lookup(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zfsvfs),
		    &xoap->xoa_av_scanstamp,
		    sizeof (xoap->xoa_av_scanstamp)) != 0)
			return;
	} else {
		dmu_object_info_t doi;
		dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
		int len;

		if (!(zp->z_pflags & ZFS_BONUS_SCANSTAMP))
			return;

		sa_object_info(zp->z_sa_hdl, &doi);
		len = sizeof (xoap->xoa_av_scanstamp) +
		    ZFS_OLD_ZNODE_PHYS_SIZE;

		if (len <= doi.doi_bonus_size) {
			(void) memcpy(xoap->xoa_av_scanstamp,
			    (caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
			    sizeof (xoap->xoa_av_scanstamp));
		}
	}
	XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
}

/*
 * Look up an entry in a directory.
 *
 * NOTE: '.' and '..' are handled as special cases because
 *	no directory entries are actually stored for them.  If this is
 *	the root of a filesystem, then '.zfs' is also treated as a
 *	special pseudo-directory.
 */
int
zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags,
            int *deflg, pathname_t *rpnp)
{
    zfs_dirlock_t *dl;
    znode_t *zp;
    int error = 0;
    uint64_t parent;

    if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
        *ipp = ZTOI(dzp);
        igrab(*ipp);
    } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
        zfs_sb_t *zsb = ZTOZSB(dzp);

        /*
         * If we are a snapshot mounted under .zfs, return
         * the vp for the snapshot directory.
         */
        if ((error = sa_lookup(dzp->z_sa_hdl,
                               SA_ZPL_PARENT(zsb), &parent, sizeof (parent))) != 0)
            return (error);
#ifdef HAVE_SNAPSHOT
        if (parent == dzp->z_id && zsb->z_parent != zsb) {
            error = zfsctl_root_lookup(zsb->z_parent->z_ctldir,
                                       "snapshot", ipp, NULL, 0, NULL, kcred,
                                       NULL, NULL, NULL);
            return (error);
        }
#endif /* HAVE_SNAPSHOT */
        rw_enter(&dzp->z_parent_lock, RW_READER);
        error = zfs_zget(zsb, parent, &zp);
        if (error == 0)
            *ipp = ZTOI(zp);
        rw_exit(&dzp->z_parent_lock);
#ifdef HAVE_SNAPSHOT
    } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
        *ipp = zfsctl_root(dzp);
#endif /* HAVE_SNAPSHOT */
    } else {
        int zf;

        zf = ZEXISTS | ZSHARED;
        if (flags & FIGNORECASE)
            zf |= ZCILOOK;

        error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
        if (error == 0) {
            *ipp = ZTOI(zp);
            zfs_dirent_unlock(dl);
            dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
        }
        rpnp = NULL;
    }

    if ((flags & FIGNORECASE) && rpnp && !error)
        (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);

    return (error);
}

void dirattrpack(attrinfo_t *aip, znode_t *zp)
{
	attrgroup_t dirattr = aip->ai_attrlist->dirattr;
	void *attrbufptr = *aip->ai_attrbufpp;

	if (ATTR_DIR_LINKCOUNT & dirattr) {
		*((u_int32_t *)attrbufptr) = 1;  /* no dir hard links */
		attrbufptr = ((u_int32_t *)attrbufptr) + 1;
	}
	if (ATTR_DIR_ENTRYCOUNT & dirattr) {
        uint64_t val;
        VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
                         &val, sizeof(val)) == 0);
		*((u_int32_t *)attrbufptr) = (uint32_t)val;
		attrbufptr = ((u_int32_t *)attrbufptr) + 1;
	}
	if (ATTR_DIR_MOUNTSTATUS & dirattr && zp) {
		vnode_t *vp = ZTOV(zp);

		if (vp != NULL && vnode_mountedhere(vp) != NULL)
			*((u_int32_t *)attrbufptr) = DIR_MNTSTATUS_MNTPOINT;
		else
			*((u_int32_t *)attrbufptr) = 0;
		attrbufptr = ((u_int32_t *)attrbufptr) + 1;
	}
	*aip->ai_attrbufpp = attrbufptr;
}

uint32_t
zfs_getbsdflags(znode_t *zp)
{
	uint32_t  bsdflags = 0;
    uint64_t zflags;
    VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_FLAGS(zp->z_zfsvfs),
                     &zflags, sizeof (zflags)) == 0);

	if (zflags & ZFS_NODUMP)
		bsdflags |= UF_NODUMP;
	if (zflags & ZFS_IMMUTABLE)
		bsdflags |= UF_IMMUTABLE;
	if (zflags & ZFS_APPENDONLY)
		bsdflags |= UF_APPEND;
	if (zflags & ZFS_OPAQUE)
		bsdflags |= UF_OPAQUE;
	if (zflags & ZFS_HIDDEN)
		bsdflags |= UF_HIDDEN;
    /*
     * Due to every file getting archive set automatically, and OSX
     * don't let you move/copy it as a user, we disable archive connection
     * for now
	if (zflags & ZFS_ARCHIVE)
		bsdflags |= SF_ARCHIVED;
    */
    dprintf("getbsd changing zfs %08lx to osx %08lx\n",
           zflags, bsdflags);
	return (bsdflags);
}

/*
 * Create the '.zfs' directory.  This directory is cached as part of the VFS
 * structure.  This results in a hold on the vfs_t.  The code in zfs_umount()
 * therefore checks against a vfs_count of 2 instead of 1.  This reference
 * is removed when the ctldir is destroyed in the unmount.
 */
void
zfsctl_create(zfsvfs_t *zfsvfs)
{
	vnode_t *vp, *rvp;
	zfsctl_node_t *zcp;
	uint64_t crtime[2];

	ASSERT(zfsvfs->z_ctldir == NULL);

	vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs,
	    &zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries,
	    zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL);
	zcp = vp->v_data;
	zcp->zc_id = ZFSCTL_INO_ROOT;

	VERIFY(VFS_ROOT(zfsvfs->z_vfs, LK_EXCLUSIVE, &rvp) == 0);
	VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
	    &crtime, sizeof (crtime)));
	ZFS_TIME_DECODE(&zcp->zc_cmtime, crtime);
	VN_URELE(rvp);

	/*
	 * We're only faking the fact that we have a root of a filesystem for
	 * the sake of the GFS interfaces.  Undo the flag manipulation it did
	 * for us.
	 */
	vp->v_vflag &= ~VV_ROOT;

	zfsvfs->z_ctldir = vp;

	VOP_UNLOCK(vp, 0);
}

int __osd_xattr_get_large(const struct lu_env *env, struct osd_device *osd,
			  uint64_t xattr, struct lu_buf *buf,
			  const char *name, int *sizep)
{
	dmu_buf_t	*xa_data_db;
	sa_handle_t	*sa_hdl = NULL;
	uint64_t	 xa_data_obj, size;
	int		 rc;

	/* are there any extended attributes? */
	if (xattr == ZFS_NO_OBJECT)
		return -ENOENT;

	/* Lookup the object number containing the xattr data */
	rc = -zap_lookup(osd->od_os, xattr, name, sizeof(uint64_t), 1,
			&xa_data_obj);
	if (rc)
		return rc;

	rc = __osd_obj2dbuf(env, osd->od_os, xa_data_obj, &xa_data_db);
	if (rc)
		return rc;

	rc = -sa_handle_get(osd->od_os, xa_data_obj, NULL, SA_HDL_PRIVATE,
			&sa_hdl);
	if (rc)
		goto out_rele;

	/* Get the xattr value length / object size */
	rc = -sa_lookup(sa_hdl, SA_ZPL_SIZE(osd), &size, 8);
	if (rc)
		goto out;

	if (size > INT_MAX) {
		rc = -EOVERFLOW;
		goto out;
	}

	*sizep = (int)size;

	if (buf == NULL || buf->lb_buf == NULL) {
		/* We only need to return the required size */
		goto out;
	}
	if (*sizep > buf->lb_len) {
		rc = -ERANGE; /* match ldiskfs error */
		goto out;
	}

	rc = -dmu_read(osd->od_os, xa_data_db->db_object, 0,
			size, buf->lb_buf, DMU_READ_PREFETCH);

out:
	sa_handle_destroy(sa_hdl);
out_rele:
	dmu_buf_rele(xa_data_db, FTAG);

	return rc;
}

void getfinderinfo(znode_t *zp, cred_t *cr, finderinfo_t *fip)
{
	vnode_t	*xdvp = NULLVP;
	vnode_t	*xvp = NULLVP;
	struct uio		*auio = NULL;
	struct componentname  cn;
	int		error;
    uint64_t xattr = 0;

    if (sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zp->z_zfsvfs),
                   &xattr, sizeof(xattr)) ||
        (xattr == 0)) {
        goto nodata;
    }

	auio = uio_create(1, 0, UIO_SYSSPACE, UIO_READ);
	if (auio == NULL) {
		goto nodata;
	}
	uio_addiov(auio, CAST_USER_ADDR_T(fip), sizeof (finderinfo_t));

	/*
	 * Grab the hidden attribute directory vnode.
	 *
	 * XXX - switch to embedded Finder Info when it becomes available
	 */
	if ((error = zfs_get_xattrdir(zp, &xdvp, cr, 0))) {
		goto out;
	}

	bzero(&cn, sizeof (cn));
	cn.cn_nameiop = LOOKUP;
	cn.cn_flags = ISLASTCN;
	cn.cn_nameptr = XATTR_FINDERINFO_NAME;
	cn.cn_namelen = strlen(cn.cn_nameptr);

	if ((error = zfs_dirlook(VTOZ(xdvp), cn.cn_nameptr, &xvp, 0, NULL, &cn))) {
		goto out;
	}
	error = dmu_read_uio(zp->z_zfsvfs->z_os, VTOZ(xvp)->z_id, auio,
	                     sizeof (finderinfo_t));
out:
	if (auio)
		uio_free(auio);
	if (xvp)
		vnode_put(xvp);
	if (xdvp)
		vnode_put(xdvp);
	if (error == 0)
		return;
nodata:
	bzero(fip, sizeof (finderinfo_t));
}

zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp)
#endif
{
    zfs_dirlock_t *dl;
    znode_t *zp;
    int error = 0;
    uint64_t parent;

#ifdef __APPLE__
    char *name = cnp->cn_nameptr;
#endif

    if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
        *vpp = ZTOV(dzp);
        VN_HOLD(*vpp);
    } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
        zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
        /*
         * If we are a snapshot mounted under .zfs, return
         * the vp for the snapshot directory.
         */
        if ((error = sa_lookup(dzp->z_sa_hdl,
                               SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
            return (error);
        if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
            error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
                                       "snapshot", vpp, NULL, 0, NULL, kcred
                                       /*, NULL, NULL, NULL*/);
            return (error);
        }
        rw_enter(&dzp->z_parent_lock, RW_READER);
        error = zfs_zget(zfsvfs, parent, &zp);
        if (error == 0)
            *vpp = ZTOV(zp);
        rw_exit(&dzp->z_parent_lock);
    } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
        *vpp = zfsctl_root(dzp);
    } else {
#ifdef __APPLE__
        error = zfs_dirent_lock(&dl, dzp, cnp, &zp, ZEXISTS | ZSHARED);
#else
        error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS | ZSHARED);
#endif
        if (error == 0) {
            *vpp = ZTOV(zp);
            zfs_dirent_unlock(dl);
            dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
        }
    }

    return (error);
}

/*
 * Update the embedded inode given the znode.  We should work toward
 * eliminating this function as soon as possible by removing values
 * which are duplicated between the znode and inode.  If the generic
 * inode has the correct field it should be used, and the ZFS code
 * updated to access the inode.  This can be done incrementally.
 */
void
zfs_inode_update(znode_t *zp)
{
	zfs_sb_t	*zsb;
	struct inode	*ip;
	uint32_t	blksize;
	uint64_t	atime[2], mtime[2], ctime[2];

	ASSERT(zp != NULL);
	zsb = ZTOZSB(zp);
	ip = ZTOI(zp);

	/* Skip .zfs control nodes which do not exist on disk. */
	if (zfsctl_is_node(ip))
		return;

	sa_lookup(zp->z_sa_hdl, SA_ZPL_ATIME(zsb), &atime, 16);
	sa_lookup(zp->z_sa_hdl, SA_ZPL_MTIME(zsb), &mtime, 16);
	sa_lookup(zp->z_sa_hdl, SA_ZPL_CTIME(zsb), &ctime, 16);

	spin_lock(&ip->i_lock);
	ip->i_generation = zp->z_gen;
	ip->i_uid = SUID_TO_KUID(zp->z_uid);
	ip->i_gid = SGID_TO_KGID(zp->z_gid);
	set_nlink(ip, zp->z_links);
	ip->i_mode = zp->z_mode;
	zfs_set_inode_flags(zp, ip);
	ip->i_blkbits = SPA_MINBLOCKSHIFT;
	dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &blksize,
	    (u_longlong_t *)&ip->i_blocks);

	ZFS_TIME_DECODE(&ip->i_atime, atime);
	ZFS_TIME_DECODE(&ip->i_mtime, mtime);
	ZFS_TIME_DECODE(&ip->i_ctime, ctime);

	i_size_write(ip, zp->z_size);
	spin_unlock(&ip->i_lock);
}