/*
* Inode operation get_posix_acl().
*
* inode->i_mutex: don't care
*/
static struct posix_acl *
ext3_get_acl(struct inode *inode, int type)
{
struct ext3_inode_info *ei = EXT3_I(inode);
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
if (!test_opt(inode->i_sb, POSIX_ACL))
return NULL;
switch(type) {
case ACL_TYPE_ACCESS:
acl = ext3_iget_acl(inode, &ei->i_acl);
if (acl != EXT3_ACL_NOT_CACHED)
return acl;
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
acl = ext3_iget_acl(inode, &ei->i_default_acl);
if (acl != EXT3_ACL_NOT_CACHED)
return acl;
name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
}
retval = ext3_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
value = kmalloc(retval, GFP_KERNEL);
if (!value)
return ERR_PTR(-ENOMEM);
retval = ext3_xattr_get(inode, name_index, "", value, retval);
}
if (retval > 0)
acl = ext3_acl_from_disk(value, retval);
else if (retval == -ENODATA || retval == -ENOSYS)
acl = NULL;
else
acl = ERR_PTR(retval);
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ext3_iset_acl(inode, &ei->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext3_iset_acl(inode, &ei->i_default_acl, acl);
break;
}
}
return acl;
}
/*
* Inode operation get_posix_acl().
*
* inode->i_mutex: don't care
*/
static struct posix_acl *
ext3_get_acl(struct inode *inode, int type)
{
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
if (!test_opt(inode->i_sb, POSIX_ACL))
return NULL;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
BUG();
}
retval = ext3_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
value = kmalloc(retval, GFP_NOFS);
if (!value)
return ERR_PTR(-ENOMEM);
retval = ext3_xattr_get(inode, name_index, "", value, retval);
}
if (retval > 0)
acl = ext3_acl_from_disk(value, retval);
else if (retval == -ENODATA || retval == -ENOSYS)
acl = NULL;
else
acl = ERR_PTR(retval);
kfree(value);
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
return acl;
}
static int
ext3_xattr_trusted_get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_TRUSTED,
name, buffer, size);
}
static int
ext3_xattr_user_get(struct inode *inode, const char *name,
void *buffer, size_t size)
{
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
return -EOPNOTSUPP;
return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
}
static int
ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
size_t size, int type)
{
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(dentry->d_sb, XATTR_USER))
return -EOPNOTSUPP;
return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_USER,
name, buffer, size);
}
/*
* Inode operation get_posix_acl().
*
* inode->i_sem: don't care
* BKL: held
*/
struct posix_acl *
ext3_get_acl(struct inode *inode, int type)
{
const size_t max_size = ext3_acl_size(EXT3_ACL_MAX_ENTRIES);
struct ext3_inode_info *ei = EXT3_I(inode);
int name_index;
char *value;
struct posix_acl *acl;
int retval;
if (!IS_POSIXACL(inode))
return 0;
switch(type) {
case ACL_TYPE_ACCESS:
if (ei->i_acl != EXT3_ACL_NOT_CACHED)
return posix_acl_dup(ei->i_acl);
name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
if (ei->i_default_acl != EXT3_ACL_NOT_CACHED)
return posix_acl_dup(ei->i_default_acl);
name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
}
value = kmalloc(max_size, GFP_KERNEL);
if (!value)
return ERR_PTR(-ENOMEM);
retval = ext3_xattr_get(inode, name_index, "", value, max_size);
acl = ERR_PTR(retval);
if (retval > 0)
acl = ext3_acl_from_disk(value, retval);
else if (retval == -ENODATA || retval == -ENOSYS)
acl = NULL;
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ei->i_acl = posix_acl_dup(acl);
break;
case ACL_TYPE_DEFAULT:
ei->i_default_acl = posix_acl_dup(acl);
break;
}
}
return acl;
}
static int
ext3_xattr_user_get(struct inode *inode, const char *name,
void *buffer, size_t size)
{
int error;
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(inode->i_sb, XATTR_USER))
return -EOPNOTSUPP;
error = permission(inode, MAY_READ, NULL);
if (error)
return error;
return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
}
