static int btrfs_initxattrs(struct inode *inode,
const struct xattr *xattr_array, void *fs_info)
{
const struct xattr *xattr;
struct btrfs_trans_handle *trans = fs_info;
unsigned int nofs_flag;
char *name;
int err = 0;
/*
* We're holding a transaction handle, so use a NOFS memory allocation
* context to avoid deadlock if reclaim happens.
*/
nofs_flag = memalloc_nofs_save();
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
strlen(xattr->name) + 1, GFP_KERNEL);
if (!name) {
err = -ENOMEM;
break;
}
strcpy(name, XATTR_SECURITY_PREFIX);
strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
err = btrfs_setxattr(trans, inode, name, xattr->value,
xattr->value_len, 0);
kfree(name);
if (err < 0)
break;
}
memalloc_nofs_restore(nofs_flag);
return err;
}
static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
struct inode *inode, struct posix_acl *acl, int type)
{
int ret, size = 0;
const char *name;
char *value = NULL;
switch (type) {
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
return acl ? -EINVAL : 0;
name = XATTR_NAME_POSIX_ACL_DEFAULT;
break;
default:
return -EINVAL;
}
if (acl) {
unsigned int nofs_flag;
size = posix_acl_xattr_size(acl->a_count);
/*
* We're holding a transaction handle, so use a NOFS memory
* allocation context to avoid deadlock if reclaim happens.
*/
nofs_flag = memalloc_nofs_save();
value = kmalloc(size, GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
if (!value) {
ret = -ENOMEM;
goto out;
}
ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
if (ret < 0)
goto out;
}
if (trans)
ret = btrfs_setxattr(trans, inode, name, value, size, 0);
else
ret = btrfs_setxattr_trans(inode, name, value, size, 0);
out:
kfree(value);
if (!ret)
set_cached_acl(inode, type, acl);
return ret;
}
static unsigned long *alloc_bitmap(u32 bitmap_size)
{
unsigned long *ret;
unsigned int nofs_flag;
u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long));
/*
* GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse
* into the filesystem as the free space bitmap can be modified in the
* critical section of a transaction commit.
*
* TODO: push the memalloc_nofs_{save,restore}() to the caller where we
* know that recursion is unsafe.
*/
nofs_flag = memalloc_nofs_save();
ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
return ret;
}
