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![Al Viro](/assets/img/avatar_default.png)
current->fs->umask is what most of fs_struct users are doing. Put that into a helper function. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
197 lines
4.2 KiB
C
197 lines
4.2 KiB
C
/*
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* fs/generic_acl.c
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*
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* (C) 2005 Andreas Gruenbacher <agruen@suse.de>
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*
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* This file is released under the GPL.
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*/
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/generic_acl.h>
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/**
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* generic_acl_list - Generic xattr_handler->list() operation
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* @ops: Filesystem specific getacl and setacl callbacks
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*/
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size_t
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generic_acl_list(struct inode *inode, struct generic_acl_operations *ops,
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int type, char *list, size_t list_size)
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{
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struct posix_acl *acl;
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const char *name;
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size_t size;
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acl = ops->getacl(inode, type);
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if (!acl)
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return 0;
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posix_acl_release(acl);
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switch(type) {
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case ACL_TYPE_ACCESS:
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name = POSIX_ACL_XATTR_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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name = POSIX_ACL_XATTR_DEFAULT;
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break;
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default:
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return 0;
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}
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size = strlen(name) + 1;
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if (list && size <= list_size)
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memcpy(list, name, size);
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return size;
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}
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/**
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* generic_acl_get - Generic xattr_handler->get() operation
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* @ops: Filesystem specific getacl and setacl callbacks
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*/
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int
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generic_acl_get(struct inode *inode, struct generic_acl_operations *ops,
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int type, void *buffer, size_t size)
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{
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struct posix_acl *acl;
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int error;
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acl = ops->getacl(inode, type);
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if (!acl)
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return -ENODATA;
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error = posix_acl_to_xattr(acl, buffer, size);
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posix_acl_release(acl);
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return error;
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}
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/**
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* generic_acl_set - Generic xattr_handler->set() operation
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* @ops: Filesystem specific getacl and setacl callbacks
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*/
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int
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generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
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int type, const void *value, size_t size)
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{
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struct posix_acl *acl = NULL;
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int error;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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if (!is_owner_or_cap(inode))
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return -EPERM;
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if (value) {
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acl = posix_acl_from_xattr(value, size);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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}
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if (acl) {
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mode_t mode;
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error = posix_acl_valid(acl);
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if (error)
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goto failed;
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switch(type) {
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case ACL_TYPE_ACCESS:
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mode = inode->i_mode;
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error = posix_acl_equiv_mode(acl, &mode);
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if (error < 0)
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goto failed;
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inode->i_mode = mode;
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if (error == 0) {
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posix_acl_release(acl);
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acl = NULL;
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}
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode)) {
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error = -EINVAL;
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goto failed;
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}
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break;
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}
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}
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ops->setacl(inode, type, acl);
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error = 0;
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failed:
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posix_acl_release(acl);
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return error;
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}
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/**
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* generic_acl_init - Take care of acl inheritance at @inode create time
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* @ops: Filesystem specific getacl and setacl callbacks
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*
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* Files created inside a directory with a default ACL inherit the
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* directory's default ACL.
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*/
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int
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generic_acl_init(struct inode *inode, struct inode *dir,
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struct generic_acl_operations *ops)
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{
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struct posix_acl *acl = NULL;
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mode_t mode = inode->i_mode;
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int error;
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inode->i_mode = mode & ~current_umask();
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if (!S_ISLNK(inode->i_mode))
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acl = ops->getacl(dir, ACL_TYPE_DEFAULT);
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if (acl) {
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struct posix_acl *clone;
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if (S_ISDIR(inode->i_mode)) {
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clone = posix_acl_clone(acl, GFP_KERNEL);
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error = -ENOMEM;
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if (!clone)
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goto cleanup;
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ops->setacl(inode, ACL_TYPE_DEFAULT, clone);
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posix_acl_release(clone);
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}
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clone = posix_acl_clone(acl, GFP_KERNEL);
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error = -ENOMEM;
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if (!clone)
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goto cleanup;
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error = posix_acl_create_masq(clone, &mode);
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if (error >= 0) {
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inode->i_mode = mode;
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if (error > 0)
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ops->setacl(inode, ACL_TYPE_ACCESS, clone);
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}
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posix_acl_release(clone);
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}
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error = 0;
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cleanup:
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posix_acl_release(acl);
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return error;
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}
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/**
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* generic_acl_chmod - change the access acl of @inode upon chmod()
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* @ops: FIlesystem specific getacl and setacl callbacks
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*
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* A chmod also changes the permissions of the owner, group/mask, and
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* other ACL entries.
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*/
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int
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generic_acl_chmod(struct inode *inode, struct generic_acl_operations *ops)
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{
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struct posix_acl *acl, *clone;
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int error = 0;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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acl = ops->getacl(inode, ACL_TYPE_ACCESS);
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if (acl) {
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clone = posix_acl_clone(acl, GFP_KERNEL);
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posix_acl_release(acl);
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if (!clone)
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return -ENOMEM;
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error = posix_acl_chmod_masq(clone, inode->i_mode);
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if (!error)
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ops->setacl(inode, ACL_TYPE_ACCESS, clone);
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posix_acl_release(clone);
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}
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return error;
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}
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