1 /* 2 * (C) 2001 Clemson University and The University of Chicago 3 * 4 * See COPYING in top-level directory. 5 */ 6 7 #include "protocol.h" 8 #include "orangefs-kernel.h" 9 #include "orangefs-bufmap.h" 10 #include <linux/posix_acl_xattr.h> 11 #include <linux/fs_struct.h> 12 13 struct posix_acl *orangefs_get_acl(struct inode *inode, int type) 14 { 15 struct posix_acl *acl; 16 int ret; 17 char *key = NULL, *value = NULL; 18 19 switch (type) { 20 case ACL_TYPE_ACCESS: 21 key = XATTR_NAME_POSIX_ACL_ACCESS; 22 break; 23 case ACL_TYPE_DEFAULT: 24 key = XATTR_NAME_POSIX_ACL_DEFAULT; 25 break; 26 default: 27 gossip_err("orangefs_get_acl: bogus value of type %d\n", type); 28 return ERR_PTR(-EINVAL); 29 } 30 /* 31 * Rather than incurring a network call just to determine the exact 32 * length of the attribute, I just allocate a max length to save on 33 * the network call. Conceivably, we could pass NULL to 34 * orangefs_inode_getxattr() to probe the length of the value, but 35 * I don't do that for now. 36 */ 37 value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL); 38 if (value == NULL) 39 return ERR_PTR(-ENOMEM); 40 41 gossip_debug(GOSSIP_ACL_DEBUG, 42 "inode %pU, key %s, type %d\n", 43 get_khandle_from_ino(inode), 44 key, 45 type); 46 ret = orangefs_inode_getxattr(inode, key, value, 47 ORANGEFS_MAX_XATTR_VALUELEN); 48 /* if the key exists, convert it to an in-memory rep */ 49 if (ret > 0) { 50 acl = posix_acl_from_xattr(&init_user_ns, value, ret); 51 } else if (ret == -ENODATA || ret == -ENOSYS) { 52 acl = NULL; 53 } else { 54 gossip_err("inode %pU retrieving acl's failed with error %d\n", 55 get_khandle_from_ino(inode), 56 ret); 57 acl = ERR_PTR(ret); 58 } 59 /* kfree(NULL) is safe, so don't worry if value ever got used */ 60 kfree(value); 61 return acl; 62 } 63 64 int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type) 65 { 66 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 67 int error = 0; 68 void *value = NULL; 69 size_t size = 0; 70 const char *name = NULL; 71 72 switch (type) { 73 case ACL_TYPE_ACCESS: 74 name = XATTR_NAME_POSIX_ACL_ACCESS; 75 if (acl) { 76 umode_t mode; 77 78 error = posix_acl_update_mode(inode, &mode, &acl); 79 if (error) { 80 gossip_err("%s: posix_acl_update_mode err: %d\n", 81 __func__, 82 error); 83 return error; 84 } 85 86 if (inode->i_mode != mode) 87 SetModeFlag(orangefs_inode); 88 inode->i_mode = mode; 89 mark_inode_dirty_sync(inode); 90 } 91 break; 92 case ACL_TYPE_DEFAULT: 93 name = XATTR_NAME_POSIX_ACL_DEFAULT; 94 break; 95 default: 96 gossip_err("%s: invalid type %d!\n", __func__, type); 97 return -EINVAL; 98 } 99 100 gossip_debug(GOSSIP_ACL_DEBUG, 101 "%s: inode %pU, key %s type %d\n", 102 __func__, get_khandle_from_ino(inode), 103 name, 104 type); 105 106 if (acl) { 107 size = posix_acl_xattr_size(acl->a_count); 108 value = kmalloc(size, GFP_KERNEL); 109 if (!value) 110 return -ENOMEM; 111 112 error = posix_acl_to_xattr(&init_user_ns, acl, value, size); 113 if (error < 0) 114 goto out; 115 } 116 117 gossip_debug(GOSSIP_ACL_DEBUG, 118 "%s: name %s, value %p, size %zd, acl %p\n", 119 __func__, name, value, size, acl); 120 /* 121 * Go ahead and set the extended attribute now. NOTE: Suppose acl 122 * was NULL, then value will be NULL and size will be 0 and that 123 * will xlate to a removexattr. However, we don't want removexattr 124 * complain if attributes does not exist. 125 */ 126 error = orangefs_inode_setxattr(inode, name, value, size, 0); 127 128 out: 129 kfree(value); 130 if (!error) 131 set_cached_acl(inode, type, acl); 132 return error; 133 } 134 135 int orangefs_init_acl(struct inode *inode, struct inode *dir) 136 { 137 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 138 struct posix_acl *default_acl, *acl; 139 umode_t mode = inode->i_mode; 140 int error = 0; 141 142 ClearModeFlag(orangefs_inode); 143 144 error = posix_acl_create(dir, &mode, &default_acl, &acl); 145 if (error) 146 return error; 147 148 if (default_acl) { 149 error = orangefs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 150 posix_acl_release(default_acl); 151 } 152 153 if (acl) { 154 if (!error) 155 error = orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS); 156 posix_acl_release(acl); 157 } 158 159 /* If mode of the inode was changed, then do a forcible ->setattr */ 160 if (mode != inode->i_mode) { 161 SetModeFlag(orangefs_inode); 162 inode->i_mode = mode; 163 orangefs_flush_inode(inode); 164 } 165 166 return error; 167 } 168