Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hfsplus/posix_acl.c |
| 3 | * |
| 4 | * Vyacheslav Dubeyko <slava@dubeyko.com> |
| 5 | * |
| 6 | * Handler for Posix Access Control Lists (ACLs) support. |
| 7 | */ |
| 8 | |
| 9 | #include "hfsplus_fs.h" |
| 10 | #include "xattr.h" |
| 11 | #include "acl.h" |
| 12 | |
| 13 | struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type) |
| 14 | { |
| 15 | struct posix_acl *acl; |
| 16 | char *xattr_name; |
| 17 | char *value = NULL; |
| 18 | ssize_t size; |
| 19 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 20 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 21 | |
| 22 | switch (type) { |
| 23 | case ACL_TYPE_ACCESS: |
Andreas Gruenbacher | 97d7929 | 2015-12-02 14:44:35 +0100 | [diff] [blame] | 24 | xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 25 | break; |
| 26 | case ACL_TYPE_DEFAULT: |
Andreas Gruenbacher | 97d7929 | 2015-12-02 14:44:35 +0100 | [diff] [blame] | 27 | xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT; |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 28 | break; |
| 29 | default: |
| 30 | return ERR_PTR(-EINVAL); |
| 31 | } |
| 32 | |
| 33 | size = __hfsplus_getxattr(inode, xattr_name, NULL, 0); |
| 34 | |
| 35 | if (size > 0) { |
| 36 | value = (char *)hfsplus_alloc_attr_entry(); |
| 37 | if (unlikely(!value)) |
| 38 | return ERR_PTR(-ENOMEM); |
| 39 | size = __hfsplus_getxattr(inode, xattr_name, value, size); |
| 40 | } |
| 41 | |
| 42 | if (size > 0) |
| 43 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
| 44 | else if (size == -ENODATA) |
| 45 | acl = NULL; |
| 46 | else |
| 47 | acl = ERR_PTR(size); |
| 48 | |
| 49 | hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value); |
| 50 | |
| 51 | if (!IS_ERR(acl)) |
| 52 | set_cached_acl(inode, type, acl); |
| 53 | |
| 54 | return acl; |
| 55 | } |
| 56 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 57 | int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, |
| 58 | int type) |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 59 | { |
| 60 | int err; |
| 61 | char *xattr_name; |
| 62 | size_t size = 0; |
| 63 | char *value = NULL; |
| 64 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 65 | hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 66 | |
| 67 | switch (type) { |
| 68 | case ACL_TYPE_ACCESS: |
Andreas Gruenbacher | 97d7929 | 2015-12-02 14:44:35 +0100 | [diff] [blame] | 69 | xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 70 | if (acl) { |
| 71 | err = posix_acl_equiv_mode(acl, &inode->i_mode); |
| 72 | if (err < 0) |
| 73 | return err; |
| 74 | } |
| 75 | err = 0; |
| 76 | break; |
| 77 | |
| 78 | case ACL_TYPE_DEFAULT: |
Andreas Gruenbacher | 97d7929 | 2015-12-02 14:44:35 +0100 | [diff] [blame] | 79 | xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT; |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 80 | if (!S_ISDIR(inode->i_mode)) |
| 81 | return acl ? -EACCES : 0; |
| 82 | break; |
| 83 | |
| 84 | default: |
| 85 | return -EINVAL; |
| 86 | } |
| 87 | |
| 88 | if (acl) { |
| 89 | size = posix_acl_xattr_size(acl->a_count); |
| 90 | if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE)) |
| 91 | return -ENOMEM; |
| 92 | value = (char *)hfsplus_alloc_attr_entry(); |
| 93 | if (unlikely(!value)) |
| 94 | return -ENOMEM; |
| 95 | err = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
| 96 | if (unlikely(err < 0)) |
| 97 | goto end_set_acl; |
| 98 | } |
| 99 | |
| 100 | err = __hfsplus_setxattr(inode, xattr_name, value, size, 0); |
| 101 | |
| 102 | end_set_acl: |
| 103 | hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value); |
| 104 | |
| 105 | if (!err) |
| 106 | set_cached_acl(inode, type, acl); |
| 107 | |
| 108 | return err; |
| 109 | } |
| 110 | |
| 111 | int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir) |
| 112 | { |
| 113 | int err = 0; |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 114 | struct posix_acl *default_acl, *acl; |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 115 | |
| 116 | hfs_dbg(ACL_MOD, |
| 117 | "[%s]: ino %lu, dir->ino %lu\n", |
| 118 | __func__, inode->i_ino, dir->i_ino); |
| 119 | |
| 120 | if (S_ISLNK(inode->i_mode)) |
| 121 | return 0; |
| 122 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 123 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
| 124 | if (err) |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 125 | return err; |
| 126 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 127 | if (default_acl) { |
| 128 | err = hfsplus_set_posix_acl(inode, default_acl, |
| 129 | ACL_TYPE_DEFAULT); |
| 130 | posix_acl_release(default_acl); |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 131 | } |
| 132 | |
Christoph Hellwig | b0a7ab5 | 2013-12-20 05:16:46 -0800 | [diff] [blame] | 133 | if (acl) { |
| 134 | if (!err) |
| 135 | err = hfsplus_set_posix_acl(inode, acl, |
| 136 | ACL_TYPE_ACCESS); |
| 137 | posix_acl_release(acl); |
| 138 | } |
Vyacheslav Dubeyko | eef80d4 | 2013-09-11 14:24:29 -0700 | [diff] [blame] | 139 | return err; |
| 140 | } |