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Linux/fs/btrfs/acl.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2007 Red Hat.  All rights reserved.
  4  */
  5 
  6 #include <linux/fs.h>
  7 #include <linux/string.h>
  8 #include <linux/xattr.h>
  9 #include <linux/posix_acl_xattr.h>
 10 #include <linux/posix_acl.h>
 11 #include <linux/sched.h>
 12 #include <linux/sched/mm.h>
 13 #include <linux/slab.h>
 14 
 15 #include "ctree.h"
 16 #include "btrfs_inode.h"
 17 #include "xattr.h"
 18 
 19 struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
 20 {
 21         int size;
 22         const char *name;
 23         char *value = NULL;
 24         struct posix_acl *acl;
 25 
 26         switch (type) {
 27         case ACL_TYPE_ACCESS:
 28                 name = XATTR_NAME_POSIX_ACL_ACCESS;
 29                 break;
 30         case ACL_TYPE_DEFAULT:
 31                 name = XATTR_NAME_POSIX_ACL_DEFAULT;
 32                 break;
 33         default:
 34                 return ERR_PTR(-EINVAL);
 35         }
 36 
 37         size = btrfs_getxattr(inode, name, NULL, 0);
 38         if (size > 0) {
 39                 value = kzalloc(size, GFP_KERNEL);
 40                 if (!value)
 41                         return ERR_PTR(-ENOMEM);
 42                 size = btrfs_getxattr(inode, name, value, size);
 43         }
 44         if (size > 0)
 45                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
 46         else if (size == -ENODATA || size == 0)
 47                 acl = NULL;
 48         else
 49                 acl = ERR_PTR(size);
 50         kfree(value);
 51 
 52         return acl;
 53 }
 54 
 55 static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
 56                          struct inode *inode, struct posix_acl *acl, int type)
 57 {
 58         int ret, size = 0;
 59         const char *name;
 60         char *value = NULL;
 61 
 62         switch (type) {
 63         case ACL_TYPE_ACCESS:
 64                 name = XATTR_NAME_POSIX_ACL_ACCESS;
 65                 break;
 66         case ACL_TYPE_DEFAULT:
 67                 if (!S_ISDIR(inode->i_mode))
 68                         return acl ? -EINVAL : 0;
 69                 name = XATTR_NAME_POSIX_ACL_DEFAULT;
 70                 break;
 71         default:
 72                 return -EINVAL;
 73         }
 74 
 75         if (acl) {
 76                 unsigned int nofs_flag;
 77 
 78                 size = posix_acl_xattr_size(acl->a_count);
 79                 /*
 80                  * We're holding a transaction handle, so use a NOFS memory
 81                  * allocation context to avoid deadlock if reclaim happens.
 82                  */
 83                 nofs_flag = memalloc_nofs_save();
 84                 value = kmalloc(size, GFP_KERNEL);
 85                 memalloc_nofs_restore(nofs_flag);
 86                 if (!value) {
 87                         ret = -ENOMEM;
 88                         goto out;
 89                 }
 90 
 91                 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
 92                 if (ret < 0)
 93                         goto out;
 94         }
 95 
 96         if (trans)
 97                 ret = btrfs_setxattr(trans, inode, name, value, size, 0);
 98         else
 99                 ret = btrfs_setxattr_trans(inode, name, value, size, 0);
100 
101 out:
102         kfree(value);
103 
104         if (!ret)
105                 set_cached_acl(inode, type, acl);
106 
107         return ret;
108 }
109 
110 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
111 {
112         int ret;
113         umode_t old_mode = inode->i_mode;
114 
115         if (type == ACL_TYPE_ACCESS && acl) {
116                 ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
117                 if (ret)
118                         return ret;
119         }
120         ret = __btrfs_set_acl(NULL, inode, acl, type);
121         if (ret)
122                 inode->i_mode = old_mode;
123         return ret;
124 }
125 
126 int btrfs_init_acl(struct btrfs_trans_handle *trans,
127                    struct inode *inode, struct inode *dir)
128 {
129         struct posix_acl *default_acl, *acl;
130         int ret = 0;
131 
132         /* this happens with subvols */
133         if (!dir)
134                 return 0;
135 
136         ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
137         if (ret)
138                 return ret;
139 
140         if (default_acl) {
141                 ret = __btrfs_set_acl(trans, inode, default_acl,
142                                       ACL_TYPE_DEFAULT);
143                 posix_acl_release(default_acl);
144         }
145 
146         if (acl) {
147                 if (!ret)
148                         ret = __btrfs_set_acl(trans, inode, acl,
149                                               ACL_TYPE_ACCESS);
150                 posix_acl_release(acl);
151         }
152 
153         if (!default_acl && !acl)
154                 cache_no_acl(inode);
155         return ret;
156 }
157 

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