コード例 #1
0
ファイル: ufs_extattr.c プロジェクト: markjdb/freebsd-dev
/*
 * Disable extended attribute support on an FS.
 */
static int
ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
    const char *attrname, struct thread *td)
{
	struct ufs_extattr_list_entry *uele;
	int error = 0;

	if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
		return (EINVAL);

	uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
	if (!uele)
		return (ENOATTR);

	LIST_REMOVE(uele, uele_entries);

	vn_lock(uele->uele_backing_vnode, LK_SHARED | LK_RETRY);
	ASSERT_VOP_LOCKED(uele->uele_backing_vnode, "ufs_extattr_disable");
	VOP_UNLOCK(uele->uele_backing_vnode, 0);
	error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE,
	    td->td_ucred, td);

	free(uele, M_UFS_EXTATTR);

	return (error);
}
コード例 #2
0
ファイル: ufs_extattr.c プロジェクト: MarginC/kame
/*
 * Disable extended attribute support on an FS.
 */
static int
ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
    const char *attrname, struct proc *p)
{
	struct ufs_extattr_list_entry	*uele;
	int	error = 0;

	if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
		return (EINVAL);

	uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
	if (!uele)
		return (ENOENT);

	LIST_REMOVE(uele, uele_entries);

	uele->uele_backing_vnode->v_flag &= ~VSYSTEM;
	error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE, p->p_ucred, p);

	FREE(uele, M_UFS_EXTATTR);

	return (error);
}
コード例 #3
0
ファイル: ufs_extattr.c プロジェクト: markjdb/freebsd-dev
/*
 * Real work associated with retrieving a named attribute--assumes that
 * the attribute lock has already been grabbed.
 */
static int
ufs_extattr_get(struct vnode *vp, int attrnamespace, const char *name,
    struct uio *uio, size_t *size, struct ucred *cred, struct thread *td)
{
	struct ufs_extattr_list_entry *attribute;
	struct ufs_extattr_header ueh;
	struct iovec local_aiov;
	struct uio local_aio;
	struct mount *mp = vp->v_mount;
	struct ufsmount *ump = VFSTOUFS(mp);
	struct inode *ip = VTOI(vp);
	off_t base_offset;
	size_t len, old_len;
	int error = 0;

	if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
		return (EOPNOTSUPP);

	if (strlen(name) == 0)
		return (EINVAL);

	error = extattr_check_cred(vp, attrnamespace, cred, td, VREAD);
	if (error)
		return (error);

	attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
	if (!attribute)
		return (ENOATTR);

	/*
	 * Allow only offsets of zero to encourage the read/replace
	 * extended attribute semantic.  Otherwise we can't guarantee
	 * atomicity, as we don't provide locks for extended attributes.
	 */
	if (uio != NULL && uio->uio_offset != 0)
		return (ENXIO);

	/*
	 * Find base offset of header in file based on file header size, and
	 * data header size + maximum data size, indexed by inode number.
	 */
	base_offset = sizeof(struct ufs_extattr_fileheader) +
	    ip->i_number * (sizeof(struct ufs_extattr_header) +
	    attribute->uele_fileheader.uef_size);

	/*
	 * Read in the data header to see if the data is defined, and if so
	 * how much.
	 */
	bzero(&ueh, sizeof(struct ufs_extattr_header));
	local_aiov.iov_base = (caddr_t) &ueh;
	local_aiov.iov_len = sizeof(struct ufs_extattr_header);
	local_aio.uio_iov = &local_aiov;
	local_aio.uio_iovcnt = 1;
	local_aio.uio_rw = UIO_READ;
	local_aio.uio_segflg = UIO_SYSSPACE;
	local_aio.uio_td = td;
	local_aio.uio_offset = base_offset;
	local_aio.uio_resid = sizeof(struct ufs_extattr_header);
	
	/*
	 * Acquire locks.
	 *
	 * Don't need to get a lock on the backing file if the getattr is
	 * being applied to the backing file, as the lock is already held.
	 */
	if (attribute->uele_backing_vnode != vp)
		vn_lock(attribute->uele_backing_vnode, LK_SHARED | LK_RETRY);

	error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
	    IO_NODELOCKED, ump->um_extattr.uepm_ucred);
	if (error)
		goto vopunlock_exit;

	/* Defined? */
	if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
		error = ENOATTR;
		goto vopunlock_exit;
	}

	/* Valid for the current inode generation? */
	if (ueh.ueh_i_gen != ip->i_gen) {
		/*
		 * The inode itself has a different generation number
		 * than the attribute data.  For now, the best solution
		 * is to coerce this to undefined, and let it get cleaned
		 * up by the next write or extattrctl clean.
		 */
		printf("ufs_extattr_get (%s): inode number inconsistency (%d, %ju)\n",
		    mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (uintmax_t)ip->i_gen);
		error = ENOATTR;
		goto vopunlock_exit;
	}

	/* Local size consistency check. */
	if (ueh.ueh_len > attribute->uele_fileheader.uef_size) {
		error = ENXIO;
		goto vopunlock_exit;
	}

	/* Return full data size if caller requested it. */
	if (size != NULL)
		*size = ueh.ueh_len;

	/* Return data if the caller requested it. */
	if (uio != NULL) {
		/* Allow for offset into the attribute data. */
		uio->uio_offset = base_offset + sizeof(struct
		    ufs_extattr_header);

		/*
		 * Figure out maximum to transfer -- use buffer size and
		 * local data limit.
		 */
		len = MIN(uio->uio_resid, ueh.ueh_len);
		old_len = uio->uio_resid;
		uio->uio_resid = len;

		error = VOP_READ(attribute->uele_backing_vnode, uio,
		    IO_NODELOCKED, ump->um_extattr.uepm_ucred);
		if (error)
			goto vopunlock_exit;

		uio->uio_resid = old_len - (len - uio->uio_resid);
	}

vopunlock_exit:

	if (uio != NULL)
		uio->uio_offset = 0;

	if (attribute->uele_backing_vnode != vp)
		VOP_UNLOCK(attribute->uele_backing_vnode, 0);

	return (error);
}
コード例 #4
0
ファイル: ufs_extattr.c プロジェクト: markjdb/freebsd-dev
/*
 * Enable a named attribute on the specified filesystem; provide an
 * unlocked backing vnode to hold the attribute data.
 */
static int
ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
    const char *attrname, struct vnode *backing_vnode, struct thread *td)
{
	struct ufs_extattr_list_entry *attribute;
	struct iovec aiov;
	struct uio auio;
	int error = 0;

	if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
		return (EINVAL);
	if (backing_vnode->v_type != VREG)
		return (EINVAL);

	attribute = malloc(sizeof(struct ufs_extattr_list_entry),
	    M_UFS_EXTATTR, M_WAITOK);

	if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
		error = EOPNOTSUPP;
		goto free_exit;
	}

	if (ufs_extattr_find_attr(ump, attrnamespace, attrname)) {
		error = EEXIST;
		goto free_exit;
	}

	strncpy(attribute->uele_attrname, attrname,
	    UFS_EXTATTR_MAXEXTATTRNAME);
	attribute->uele_attrnamespace = attrnamespace;
	bzero(&attribute->uele_fileheader,
	    sizeof(struct ufs_extattr_fileheader));
	
	attribute->uele_backing_vnode = backing_vnode;

	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	aiov.iov_base = (caddr_t) &attribute->uele_fileheader;
	aiov.iov_len = sizeof(struct ufs_extattr_fileheader);
	auio.uio_resid = sizeof(struct ufs_extattr_fileheader);
	auio.uio_offset = (off_t) 0;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_rw = UIO_READ;
	auio.uio_td = td;

	vn_lock(backing_vnode, LK_SHARED | LK_RETRY);
	error = VOP_READ(backing_vnode, &auio, IO_NODELOCKED,
	    ump->um_extattr.uepm_ucred);

	if (error)
		goto unlock_free_exit;

	if (auio.uio_resid != 0) {
		printf("ufs_extattr_enable: malformed attribute header\n");
		error = EINVAL;
		goto unlock_free_exit;
	}

	if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) {
		printf("ufs_extattr_enable: invalid attribute header magic\n");
		error = EINVAL;
		goto unlock_free_exit;
	}

	if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) {
		printf("ufs_extattr_enable: incorrect attribute header "
		    "version\n");
		error = EINVAL;
		goto unlock_free_exit;
	}

	ASSERT_VOP_LOCKED(backing_vnode, "ufs_extattr_enable");
	LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute,
	    uele_entries);

	VOP_UNLOCK(backing_vnode, 0);
	return (0);

unlock_free_exit:
	VOP_UNLOCK(backing_vnode, 0);

free_exit:
	free(attribute, M_UFS_EXTATTR);
	return (error);
}
コード例 #5
0
ファイル: ufs_extattr.c プロジェクト: markjdb/freebsd-dev
/*
 * Real work associated with removing an extended attribute from a vnode.
 * Assumes the attribute lock has already been grabbed.
 */
static int
ufs_extattr_rm(struct vnode *vp, int attrnamespace, const char *name,
    struct ucred *cred, struct thread *td)
{
	struct ufs_extattr_list_entry *attribute;
	struct ufs_extattr_header ueh;
	struct iovec local_aiov;
	struct uio local_aio;
	struct mount *mp = vp->v_mount;
	struct ufsmount *ump = VFSTOUFS(mp);
	struct inode *ip = VTOI(vp);
	off_t base_offset;
	int error = 0, ioflag;

	if (vp->v_mount->mnt_flag & MNT_RDONLY)  
		return (EROFS);
	if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
		return (EOPNOTSUPP);
	if (!ufs_extattr_valid_attrname(attrnamespace, name))
		return (EINVAL);

	error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
	if (error)
		return (error);

	attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
	if (!attribute)
		return (ENOATTR);

	/*
	 * Find base offset of header in file based on file header size, and
	 * data header size + maximum data size, indexed by inode number.
	 */
	base_offset = sizeof(struct ufs_extattr_fileheader) +
	    ip->i_number * (sizeof(struct ufs_extattr_header) +
	    attribute->uele_fileheader.uef_size);

	/*
	 * Check to see if currently defined.
	 */
	bzero(&ueh, sizeof(struct ufs_extattr_header));

	local_aiov.iov_base = (caddr_t) &ueh;
	local_aiov.iov_len = sizeof(struct ufs_extattr_header);
	local_aio.uio_iov = &local_aiov;
	local_aio.uio_iovcnt = 1;
	local_aio.uio_rw = UIO_READ;
	local_aio.uio_segflg = UIO_SYSSPACE;
	local_aio.uio_td = td;
	local_aio.uio_offset = base_offset;
	local_aio.uio_resid = sizeof(struct ufs_extattr_header);

	/*
	 * Don't need to get the lock on the backing vnode if the vnode we're
	 * modifying is it, as we already hold the lock.
	 */
	if (attribute->uele_backing_vnode != vp)
		vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);

	error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
	    IO_NODELOCKED, ump->um_extattr.uepm_ucred);
	if (error)
		goto vopunlock_exit;

	/* Defined? */
	if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
		error = ENOATTR;
		goto vopunlock_exit;
	}

	/* Valid for the current inode generation? */
	if (ueh.ueh_i_gen != ip->i_gen) {
		/*
		 * The inode itself has a different generation number than
		 * the attribute data.  For now, the best solution is to
		 * coerce this to undefined, and let it get cleaned up by
		 * the next write or extattrctl clean.
		 */
		printf("ufs_extattr_rm (%s): inode number inconsistency (%d, %jd)\n",
		    mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (intmax_t)ip->i_gen);
		error = ENOATTR;
		goto vopunlock_exit;
	}

	/* Flag it as not in use. */
	ueh.ueh_flags = 0;
	ueh.ueh_len = 0;

	local_aiov.iov_base = (caddr_t) &ueh;
	local_aiov.iov_len = sizeof(struct ufs_extattr_header);
	local_aio.uio_iov = &local_aiov;
	local_aio.uio_iovcnt = 1;
	local_aio.uio_rw = UIO_WRITE;
	local_aio.uio_segflg = UIO_SYSSPACE;
	local_aio.uio_td = td;
	local_aio.uio_offset = base_offset;
	local_aio.uio_resid = sizeof(struct ufs_extattr_header);

	ioflag = IO_NODELOCKED;
	if (ufs_extattr_sync)
		ioflag |= IO_SYNC;
	error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
	    ump->um_extattr.uepm_ucred);
	if (error)
		goto vopunlock_exit;

	if (local_aio.uio_resid != 0)
		error = ENXIO;

vopunlock_exit:
	VOP_UNLOCK(attribute->uele_backing_vnode, 0);

	return (error);
}
コード例 #6
0
ファイル: ufs_extattr.c プロジェクト: markjdb/freebsd-dev
/*
 * Real work associated with setting a vnode's extended attributes;
 * assumes that the attribute lock has already been grabbed.
 */
static int
ufs_extattr_set(struct vnode *vp, int attrnamespace, const char *name,
    struct uio *uio, struct ucred *cred, struct thread *td)
{
	struct ufs_extattr_list_entry *attribute;
	struct ufs_extattr_header ueh;
	struct iovec local_aiov;
	struct uio local_aio;
	struct mount *mp = vp->v_mount;
	struct ufsmount *ump = VFSTOUFS(mp);
	struct inode *ip = VTOI(vp);
	off_t base_offset;
	int error = 0, ioflag;

	if (vp->v_mount->mnt_flag & MNT_RDONLY)
		return (EROFS);
	if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
		return (EOPNOTSUPP);
	if (!ufs_extattr_valid_attrname(attrnamespace, name))
		return (EINVAL);

	error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
	if (error)
		return (error);

	attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
	if (!attribute)
		return (ENOATTR);

	/*
	 * Early rejection of invalid offsets/length.
	 * Reject: any offset but 0 (replace)
	 *	 Any size greater than attribute size limit
 	 */
	if (uio->uio_offset != 0 ||
	    uio->uio_resid > attribute->uele_fileheader.uef_size)
		return (ENXIO);

	/*
	 * Find base offset of header in file based on file header size, and
	 * data header size + maximum data size, indexed by inode number.
	 */
	base_offset = sizeof(struct ufs_extattr_fileheader) +
	    ip->i_number * (sizeof(struct ufs_extattr_header) +
	    attribute->uele_fileheader.uef_size);

	/*
	 * Write out a data header for the data.
	 */
	ueh.ueh_len = uio->uio_resid;
	ueh.ueh_flags = UFS_EXTATTR_ATTR_FLAG_INUSE;
	ueh.ueh_i_gen = ip->i_gen;
	local_aiov.iov_base = (caddr_t) &ueh;
	local_aiov.iov_len = sizeof(struct ufs_extattr_header);
	local_aio.uio_iov = &local_aiov;
	local_aio.uio_iovcnt = 1;
	local_aio.uio_rw = UIO_WRITE;
	local_aio.uio_segflg = UIO_SYSSPACE;
	local_aio.uio_td = td;
	local_aio.uio_offset = base_offset;
	local_aio.uio_resid = sizeof(struct ufs_extattr_header);

	/*
	 * Acquire locks.
	 *
	 * Don't need to get a lock on the backing file if the setattr is
	 * being applied to the backing file, as the lock is already held.
	 */
	if (attribute->uele_backing_vnode != vp)
		vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);

	ioflag = IO_NODELOCKED;
	if (ufs_extattr_sync)
		ioflag |= IO_SYNC;
	error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
	    ump->um_extattr.uepm_ucred);
	if (error)
		goto vopunlock_exit;

	if (local_aio.uio_resid != 0) {
		error = ENXIO;
		goto vopunlock_exit;
	}

	/*
	 * Write out user data.
	 */
	uio->uio_offset = base_offset + sizeof(struct ufs_extattr_header);

	ioflag = IO_NODELOCKED;
	if (ufs_extattr_sync)
		ioflag |= IO_SYNC;
	error = VOP_WRITE(attribute->uele_backing_vnode, uio, ioflag,
	    ump->um_extattr.uepm_ucred);

vopunlock_exit:
	uio->uio_offset = 0;

	if (attribute->uele_backing_vnode != vp)
		VOP_UNLOCK(attribute->uele_backing_vnode, 0);

	return (error);
}