fs/jfs/acl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) International Business Machines  Corp., 2002-2004
   4  *   Copyright (C) Andreas Gruenbacher, 2001
   5  *   Copyright (C) Linus Torvalds, 1991, 1992
   6  */
   7
   8 #include <linux/sched.h>
   9 #include <linux/slab.h>
  10 #include <linux/fs.h>
  11 #include <linux/posix_acl_xattr.h>
  12 #include "jfs_incore.h"
  13 #include "jfs_txnmgr.h"
  14 #include "jfs_xattr.h"
  15 #include "jfs_acl.h"
  16
  17 struct posix_acl *jfs_get_acl(struct inode *inode, int type)
  18 {
  19         struct posix_acl *acl;
  20         char *ea_name;
  21         int size;
  22         char *value = NULL;
  23
  24         switch(type) {
  25                 case ACL_TYPE_ACCESS:
  26                         ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
  27                         break;
  28                 case ACL_TYPE_DEFAULT:
  29                         ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
  30                         break;
  31                 default:
  32                         return ERR_PTR(-EINVAL);
  33         }
  34
  35         size = __jfs_getxattr(inode, ea_name, NULL, 0);
  36
  37         if (size > 0) {
  38                 value = kmalloc(size, GFP_KERNEL);
  39                 if (!value)
  40                         return ERR_PTR(-ENOMEM);
  41                 size = __jfs_getxattr(inode, ea_name, value, size);
  42         }
  43
  44         if (size < 0) {
  45                 if (size == -ENODATA)
  46                         acl = NULL;
  47                 else
  48                         acl = ERR_PTR(size);
  49         } else {
  50                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
  51         }
  52         kfree(value);
  53         return acl;
  54 }
  55
  56 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
  57                        struct posix_acl *acl)
  58 {
  59         char *ea_name;
  60         int rc;
  61         int size = 0;
  62         char *value = NULL;
  63
  64         switch (type) {
  65         case ACL_TYPE_ACCESS:
  66                 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
  67                 break;
  68         case ACL_TYPE_DEFAULT:
  69                 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
  70                 break;
  71         default:
  72                 return -EINVAL;
  73         }
  74
  75         if (acl) {
  76                 size = posix_acl_xattr_size(acl->a_count);
  77                 value = kmalloc(size, GFP_KERNEL);
  78                 if (!value)
  79                         return -ENOMEM;
  80                 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
  81                 if (rc < 0)
  82                         goto out;
  83         }
  84         rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
  85 out:
  86         kfree(value);
  87
  88         if (!rc)
  89                 set_cached_acl(inode, type, acl);
  90
  91         return rc;
  92 }
  93
  94 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
  95 {
  96         int rc;
  97         tid_t tid;
  98         int update_mode = 0;
  99         umode_t mode = inode->i_mode;
 100
 101         tid = txBegin(inode->i_sb, 0);
 102         mutex_lock(&JFS_IP(inode)->commit_mutex);
 103         if (type == ACL_TYPE_ACCESS && acl) {
 104                 rc = posix_acl_update_mode(inode, &mode, &acl);
 105                 if (rc)
 106                         goto end_tx;
 107                 if (mode != inode->i_mode)
 108                         update_mode = 1;
 109         }
 110         rc = __jfs_set_acl(tid, inode, type, acl);
 111         if (!rc) {
 112                 if (update_mode) {
 113                         inode->i_mode = mode;
 114                         inode->i_ctime = current_time(inode);
 115                         mark_inode_dirty(inode);
 116                 }
 117                 rc = txCommit(tid, 1, &inode, 0);
 118         }
 119 end_tx:
 120         txEnd(tid);
 121         mutex_unlock(&JFS_IP(inode)->commit_mutex);
 122         return rc;
 123 }
 124
 125 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
 126 {
 127         struct posix_acl *default_acl, *acl;
 128         int rc = 0;
 129
 130         rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
 131         if (rc)
 132                 return rc;
 133
 134         if (default_acl) {
 135                 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
 136                 posix_acl_release(default_acl);
 137         } else {
 138                 inode->i_default_acl = NULL;
 139         }
 140
 141         if (acl) {
 142                 if (!rc)
 143                         rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
 144                 posix_acl_release(acl);
 145         } else {
 146                 inode->i_acl = NULL;
 147         }
 148
 149         JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
 150                                inode->i_mode;
 151
 152         return rc;
 153 }