/* * FUSE: Filesystem in Userspace * Copyright (C) 2016 Canonical Ltd. * * This program can be distributed under the terms of the GNU GPL. * See the file COPYING. */ #include "fuse_i.h" #include #include struct posix_acl *fuse_get_acl(struct inode *inode, int type) { struct fuse_conn *fc = get_fuse_conn(inode); int size; const char *name; void *value = NULL; struct posix_acl *acl; if (!fc->posix_acl || fc->no_getxattr) return NULL; if (type == ACL_TYPE_ACCESS) name = XATTR_NAME_POSIX_ACL_ACCESS; else if (type == ACL_TYPE_DEFAULT) name = XATTR_NAME_POSIX_ACL_DEFAULT; else return ERR_PTR(-EOPNOTSUPP); value = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!value) return ERR_PTR(-ENOMEM); size = fuse_getxattr(inode, name, value, PAGE_SIZE); if (size > 0) acl = posix_acl_from_xattr(&init_user_ns, value, size); else if ((size == 0) || (size == -ENODATA) || (size == -EOPNOTSUPP && fc->no_getxattr)) acl = NULL; else if (size == -ERANGE) acl = ERR_PTR(-E2BIG); else acl = ERR_PTR(size); kfree(value); return acl; } int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type) { struct fuse_conn *fc = get_fuse_conn(inode); const char *name; int ret; if (!fc->posix_acl || fc->no_setxattr) return -EOPNOTSUPP; if (type == ACL_TYPE_ACCESS) name = XATTR_NAME_POSIX_ACL_ACCESS; else if (type == ACL_TYPE_DEFAULT) name = XATTR_NAME_POSIX_ACL_DEFAULT; else return -EINVAL; if (acl) { /* * Fuse userspace is responsible for updating access * permissions in the inode, if needed. fuse_setxattr * invalidates the inode attributes, which will force * them to be refreshed the next time they are used, * and it also updates i_ctime. */ size_t size = posix_acl_xattr_size(acl->a_count); void *value; if (size > PAGE_SIZE) return -E2BIG; value = kmalloc(size, GFP_KERNEL); if (!value) return -ENOMEM; ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (ret < 0) { kfree(value); return ret; } ret = fuse_setxattr(inode, name, value, size, 0); kfree(value); } else { ret = fuse_removexattr(inode, name); } forget_all_cached_acls(inode); fuse_invalidate_attr(inode); return ret; } /a>
path: root/sound/pci/lx6464es
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /sound/pci/lx6464es
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/pci/lx6464es')