Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | /* * fs/generic_acl.c * * (C) 2005 Andreas Gruenbacher <agruen@suse.de> * * This file is released under the GPL. */ #include <linux/sched.h> #include <linux/fs.h> #include <linux/generic_acl.h> /** * generic_acl_list - Generic xattr_handler->list() operation * @ops: Filesystem specific getacl and setacl callbacks */ size_t generic_acl_list(struct inode *inode, struct generic_acl_operations *ops, int type, char *list, size_t list_size) { struct posix_acl *acl; const char *name; size_t size; acl = ops->getacl(inode, type); if (!acl) return 0; posix_acl_release(acl); switch(type) { case ACL_TYPE_ACCESS: name = POSIX_ACL_XATTR_ACCESS; break; case ACL_TYPE_DEFAULT: name = POSIX_ACL_XATTR_DEFAULT; break; default: return 0; } size = strlen(name) + 1; if (list && size <= list_size) memcpy(list, name, size); return size; } /** * generic_acl_get - Generic xattr_handler->get() operation * @ops: Filesystem specific getacl and setacl callbacks */ int generic_acl_get(struct inode *inode, struct generic_acl_operations *ops, int type, void *buffer, size_t size) { struct posix_acl *acl; int error; acl = ops->getacl(inode, type); if (!acl) return -ENODATA; error = posix_acl_to_xattr(acl, buffer, size); posix_acl_release(acl); return error; } /** * generic_acl_set - Generic xattr_handler->set() operation * @ops: Filesystem specific getacl and setacl callbacks */ int generic_acl_set(struct inode *inode, struct generic_acl_operations *ops, int type, const void *value, size_t size) { struct posix_acl *acl = NULL; int error; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; if (!is_owner_or_cap(inode)) return -EPERM; if (value) { acl = posix_acl_from_xattr(value, size); if (IS_ERR(acl)) return PTR_ERR(acl); } if (acl) { mode_t mode; error = posix_acl_valid(acl); if (error) goto failed; switch(type) { case ACL_TYPE_ACCESS: mode = inode->i_mode; error = posix_acl_equiv_mode(acl, &mode); if (error < 0) goto failed; inode->i_mode = mode; if (error == 0) { posix_acl_release(acl); acl = NULL; } break; case ACL_TYPE_DEFAULT: if (!S_ISDIR(inode->i_mode)) { error = -EINVAL; goto failed; } break; } } ops->setacl(inode, type, acl); error = 0; failed: posix_acl_release(acl); return error; } /** * generic_acl_init - Take care of acl inheritance at @inode create time * @ops: Filesystem specific getacl and setacl callbacks * * Files created inside a directory with a default ACL inherit the * directory's default ACL. */ int generic_acl_init(struct inode *inode, struct inode *dir, struct generic_acl_operations *ops) { struct posix_acl *acl = NULL; mode_t mode = inode->i_mode; int error; inode->i_mode = mode & ~current_umask(); if (!S_ISLNK(inode->i_mode)) acl = ops->getacl(dir, ACL_TYPE_DEFAULT); if (acl) { struct posix_acl *clone; if (S_ISDIR(inode->i_mode)) { clone = posix_acl_clone(acl, GFP_KERNEL); error = -ENOMEM; if (!clone) goto cleanup; ops->setacl(inode, ACL_TYPE_DEFAULT, clone); posix_acl_release(clone); } clone = posix_acl_clone(acl, GFP_KERNEL); error = -ENOMEM; if (!clone) goto cleanup; error = posix_acl_create_masq(clone, &mode); if (error >= 0) { inode->i_mode = mode; if (error > 0) ops->setacl(inode, ACL_TYPE_ACCESS, clone); } posix_acl_release(clone); } error = 0; cleanup: posix_acl_release(acl); return error; } /** * generic_acl_chmod - change the access acl of @inode upon chmod() * @ops: FIlesystem specific getacl and setacl callbacks * * A chmod also changes the permissions of the owner, group/mask, and * other ACL entries. */ int generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops) { struct posix_acl *acl, *clone; int error = 0; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; acl = ops->getacl(inode, ACL_TYPE_ACCESS); if (acl) { clone = posix_acl_clone(acl, GFP_KERNEL); posix_acl_release(acl); if (!clone) return -ENOMEM; error = posix_acl_chmod_masq(clone, inode->i_mode); if (!error) ops->setacl(inode, ACL_TYPE_ACCESS, clone); posix_acl_release(clone); } return error; } |